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30 August 2021, Volume 46 Issue 16 Previous Issue   
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New Energy vehicles
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Standards Regulations Management
Overview
Automobile Education


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Research on Power System Matching of Pure Electric Commercial Vehicle LI Zetian 2021, 46(16): 1-3.  DOI: 10.16638/j.cnki.1671-7988.2021.016.001 Abstract ( )   PDF (1276KB) ( )   In this paper, four powertrain schemes are designed based on pure electric commercial vehicle. According to the requirements of the vehicle's dynamic performance and economic index, the parameters of the power system were first matched, and then the speed ratio parameters of the transmission system were optimized by using the multi-island genetic algorithm. Finally, the actual operating conditions of xi'an city were imported into the cruise software for simulation comparison. The results show that the performance of the vehicle can be improved by optimizing the speed ratio parameters. The four powertrain schemes designed meet the requirements of the vehicle performance index under the actual working condition in xi 'an, among which the double-motor powertrain scheme is more economical. References | Related Articles | Metrics

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Failure Mode Analysis of Corrosion Phenomenon of Power Battery WEI Yingzhu, HUANG Zupeng , HUANG Wurong, DU Zhi, LI Bin 2021, 46(16): 4-5.  DOI: 10.16638/j.cnki.1671-7988.2021.016.002 Abstract ( )   PDF (3896KB) ( )   As an important protective part of the battery of new energy electric vehicles, the corrosion resistance of the battery box directly affects the durability and life of the battery, and even the safety of the whole vehicle.This paper will start with several common failure modes in the corrosion of power battery box, and analyze the causes of them, so as to provide a strong theoretical basis for the corrosion resistance design of battery box. References | Related Articles | Metrics

New Energy vehicles

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Strength Analysis and Lightweight Design of a New Energy Light Commercial Bus Battery Pack Bracket HUANG Jiewen 2021, 46(16): 6-8.  DOI: 10.16638/j.cnki.1671-7988.2021.016.003 Abstract ( )   PDF (737KB) ( )   Aiming at verifing the strength performance of a new energy light commercial bus battery pack bracket. Firstly,the finite element model of the battery pack bracket was established. it was strength analyzed by loading gravity field in different directions based on stress state of different working conditions, the analysised result showed that its stress was less than the yield strength of the material, so it could meet design requirements. Lastly, the thickness of battery pack bracket was optimization design based on integration platform, the battery pack bracket optimal thickness were obtained, its strength performance could meet the requirements after optimization, and its weight was reduced by7.7%, the effect of light weight was reached. References | Related Articles | Metrics

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Research on the Strategy of a Pure Electric Vehicle Instrument Display LIU Chunhui 2021, 46(16): 9-10.  DOI: 10.16638/j.cnki.1671-7988.2021.016.004 Abstract ( )   PDF (580KB) ( )   The ambient temperature has a great impact on the true driving range of pure electric vehicles. Therefore, this paper designs a new instrument display strategy of driving range based on the instrument display function of pure electric vehicles and taking the environmental temperature factor into consideration.This strategy effectively reduces the deviation between the vehicle's driving mileage displayed by the instrument under different ambient temperatures and the vehicle's real driving mileage, so that users can more accurately evaluate the vehicle's real driving mileage while using the vehicle, and thus improve the user's car experience. References | Related Articles | Metrics

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Structure and Classification of Electric Vehicle Drive System TANG Xiaohua 2021, 46(16): 11-13.  DOI: 10.16638/j.cnki.1671-7988.2021.016.005 Abstract ( )   PDF (505KB) ( )   Electric vehicle drive system is one of the core components of electric vehicle. The main function of drive motor is to generate power, which is equivalent to the engine of traditional vehicle. There is a big difference between drive motor and industrial motor. Electric vehicle has very strict requirements for drive motor. There are many types of drive system, which are suitable for electric vehicles of different manufacturers. References | Related Articles | Metrics

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Analysis of Simulation Method for Rear-end Collision of Electric Vehicle XU Yunjie 2021, 46(16): 14-16.  DOI: 10.16638/j.cnki.1671-7988.2021.016.006 Abstract ( )   PDF (744KB) ( )   With the increasing popularity of electric vehicles, the market pays more and more attention to the safety of electric vehicles, especially the battery safety in the process of collision. This paper analyzes the simulation analysis method of electric vehicle rear-end collision based on Ls_Dyna finite element simulation analysis software, describes the basic requirements of rear-end collision simulation analysis, model establishment, analysis method, and simulation results postprocessing requirements. Through the use of standardized virtual development technology, greatly shorten the development cycle and development cost. The simulation analysis method has a good guiding role for the pre-test investigation, optimization verification and performance improvement. References | Related Articles | Metrics

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Experimental Frosting Study under Protection Condition of Front Evaporator on New Energy Vehicle SUI Guansheng 2021, 46(16): 17-20.  DOI: 10.16638/j.cnki.1671-7988.2021.016.007 Abstract ( )   PDF (3703KB) ( )   To study the frosting problem of the front evaporator of new energy vehicles, a frosting test bench has been built. Considering the general low-pressure protection strategy of compressor, the frosting of front evaporator has been studied. The results show that the outlet air temperature and heating capacity of the system decrease continuously with the development of frost layer, and the maximum loss reaches 48.7%. Therefore, the system must compensate the lost heating capacity by other ways. The COP of the system will rise after entering the low-pressure protection. By using PTC to compensate the loss of frosting heating capacity, the total efficiency of the system decreases from 2.2 to 1.4. It is recommended to use PTC under the driving condition to compensate the loss of heating capacity caused by frosting. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Vehicle Autonomous Lane Changing Control Based on Preview ZHAO Hao 2021, 46(16): 21-25.  DOI: 10.16638/j.cnki.1671-7988.2021.016.008 Abstract ( )   PDF (1363KB) ( )   In this paper, the method of autonomous lane changing for high-speed vehicles is studied. Considering the dynamic characteristics of vehicles, a simplified two degree of freedom vehicle model is established. In order to better simulate the actual curve, the lane changing trajectory planning model adopts quintic polynomial curve. Based on the preview point search model and dynamic model, the transfer function between the front wheel angle and preview error is calculated, and the trajectory tracking controller is designed by feedforward and feedback. The simulation results show that the control effect of the autonomous lane change control strategy is better. References | Related Articles | Metrics

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Risk Classification Method of Automotive Cyber Security Based on Hybrid Analysis YUE Lijiao 2021, 46(16): 26-29.  DOI: 10.16638/j.cnki.1671-7988.2021.016.009 Abstract ( )   PDF (1103KB) ( )   With the rapid development of the network technology of intelligent connected vehicles, the classification of vehicle cyber security risk will provide a good reference for the cyber security management of intelligent connected vehicles. This paper were introduced for auto parts in the process of risk assessment for cyber security risk classification method, using the mixture of qualitative and quantitative analysis method of cyber security related items on vehicles information to identify and extract the key features, at the same time, based on the quantitative assessment of the potential attack method to estimate the risk level is calculated. In addition, the validity of the proposed method is verified by using the T-box as an example. References | Related Articles | Metrics

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Design of Human Machine Interaction for Highway Automatic Driving ZHANG Bosen 2021, 46(16): 30-32.  DOI: 10.16638/j.cnki.1671-7988.2021.016.010 Abstract ( )   PDF (1038KB) ( )   In view of the automatic driving function of the freeway, the human-machine interaction plan designed in this paper takes full account of how to make the driver establish trust in the automatic driving system, and display the surrounding environment and function state of the autopilot to the driver in a reasonable way through instruments, MP5, seat belt vibration and so on. When the system is unable to complete the driving task and requires the driver to take over, the human-machine interaction system can give users multi-dimensional reminder through the way of vision, hearing and touch, so as to ensure the smooth handover between the driver and the automatic driving system. Related Articles | Metrics

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Research on Intelligent Vehicle Ahead Vehicle Recognition Method Based on Single Sensor ZHANG Shiqiang 2021, 46(16): 33-36.  DOI: 10.16638/j.cnki.1671-7988.2021.016.011 Abstract ( )   PDF (733KB) ( )   Effective environment perception is an important embodiment of intelligent vehicle. The leading vehicle identification of intelligent vehicle based on vision sensor and radar sensor is one of the important development directions of intelligent vehicle. At present, some achievements have been made in related fields, but there is still room for improvement in detection accuracy and detection rate. In this paper, we outline the development process of the leading vehicle recognition algorithm based on the above two kinds of sensors and the existing leading vehicle recognition methods of domestic and foreign researchers, compare and analyze the relevant target detection methods, point out the shortcoming of vehicle recognition algorithm based on single sensor, and put forward a kind of reasonable improvement measure. References | Related Articles | Metrics

Design and Research

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Electronic Fan Control System Software Development ZHANG Xiangtian 2021, 46(16): 37-42.  DOI: 10.16638/j.cnki.1671-7988.2021.016.012 Abstract ( )   PDF (2033KB) ( )   The electronic fan can be distributed on demand, effectively improving the efficiency of the engine cooling system and reducing the engine temperature in time. According to the working requirements of the electronic fan controller developed on the basis of the S9S08DZ60 single-chip microcomputer, this paper analyzes the programs required by each function, determines the configuration of the corresponding registers, and designs the various bottom control programs and overall framework programs. A series of software programs including sensor signal acquisition program, switch signal input program and CAN bus communication program, etc., to control the normal operation of the single-chip microcomputer to realize the control of the electronic fan and meet the actual application requirements. References | Related Articles | Metrics

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Design and Implementation of Universal Controller for Rail Transit Test Stand GUO Yongqing 2021, 46(16): 43-47.  DOI: 10.16638/j.cnki.1671-7988.2021.016.013 Abstract ( )   PDF (1118KB) ( )   In order to solve the disadvantages of the traditional rail transit test stand controller, such as unable to be customized, difficult protection of intellectual property rights, single interface, unable to synchronously sample and intelligent operation and maintenance, this paper designed a general controller system based on ZYNQ (ARM+FPGA) as the main processor and CPLD and MCU as the slave processors. Among them, ARM processor is used for Ethernet communication, wireless communication, big data storage, control logic and control algorithm implementation, and at the same time fast communication with FPGA through internal AXI bus interface.FPGA mainly uses the self-developed high-speed serial communication mode (SSB bus) and the slave processor CPLD to communicate. CPLD completes the requirement of high-speed parallel data acquisition by controlling multi-chip AD7606. ARM also communicates with MCU through CAN communication interface, realizing the expansion and control of low-speed multi-interface acquisition. The practical application of the controller shows that the controller can be flexibly configured as a test controller for each core control system of rail transit, and the verification of each function, performance and algorithm required by each core control system is completed, and the product performance is reliable. References | Related Articles | Metrics

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Analysis and Improvement of Water Leakage in Door Area during Rain Test XI Rui 2021, 46(16): 48-51.  DOI: 10.16638/j.cnki.1671-7988.2021.016.014 Abstract ( )   PDF (2807KB) ( )   Carry out the rain test of the whole vehicle in the trial production stage, investigate the typical water leakage problems that occurred in the door waterproof membrane, door guard plate, wiring harness, etc., and formulate corresponding improvement measures through the analysis of the failure cause, and finally solve the problem of water leakage in rain test. Accumulated experience for the design of subsequent models. References | Related Articles | Metrics

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Research on the Aerodynamic Surrogate Modeling for Aircraft WingCollaborative Optimization WU Gang 2021, 46(16): 52-57.  DOI: 10.16638/j.cnki.1671-7988.2021.016.015 Abstract ( )   PDF (1120KB) ( )   The experiment design technology of orthogonal array and latin cube, and the approximation models of polynomial response surface, kriging model and the radial basis function neural network were separately used to approximate the mapping relationship between the design variables and the performance parameters for the wings’ optimization. Considering the cost and accuracy of the approximation, the surrogate model based on radial basis function neural network was selected to replace the high precision aerodynamic analysis model to participate in the aircraft wings’ multidisciplinary optimization to realize the disciplines approximation and reduce the operation cost. References | Related Articles | Metrics

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Calibration Research on Pedal Impact of DCT Vehicle during Downshifting FANG Yixue 2021, 46(16): 58-62.  DOI: 10.16638/j.cnki.1671-7988.2021.016.016 Abstract ( )   PDF (2517KB) ( )   There is inevitably a gap in the vehicle power transmission system, especially in the urban driving process, the brake pedal and the accelerator pedal are frequently switched, stepping on the accelerator pedal during coasting downshifting will often induce serious shift shock problems. This article analyzes the reason of the impact from the hardware structure and control principle as the direction switching of the drive train. Through the control strategy and calibration optimization, the drive direction is actively switched during the gear shifting process, the feasibility of the strategy is verified by the actual vehicle test. And it has been promoted on related models. References | Related Articles | Metrics

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Analysis and Optimization of the Reflection Problem of the Vehicle's Combined Instrument Field of View LI Xuming 2021, 46(16): 63-65.  DOI: 10.16638/j.cnki.1671-7988.2021.016.017 Abstract ( )   PDF (956KB) ( )   As one of the media for the driver to obtain the key information of the car in the process of driving the car, the car instrument mainly displays the speed, fuel quantity, engine speed and related warning signals of the car. It plays a very important role for the driver during driving. The visibility of the instrument is very important to the driver. If there are some virtual images, the driver will be dazzled, and even under strong light conditions, the driver will be dizzy, affecting driving safety. This paper analyzes the problem of the driver’s clothing entering the human body's field of vision after reflection and imaging on the curved glass cover of the combined instrument under strong light, and simulates it through the CATIA optical principle, and judges whether it will affect the driver’s driving safety from the reflection result. And through analysis and optimization, to avoid the appearance of virtual images in the automobile combination instrument, which affects driving safety. References | Related Articles | Metrics

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Research on Method Based on Automatic Vehicle Weighing System QIN Cheng 2021, 46(16): 66-68.  DOI: 10.16638/j.cnki.1671-7988.2021.016.018 Abstract ( )   PDF (1594KB) ( )   :The paper designed three kinds of automatic vehicle weighing system. Based on big data, the vehicle sensors of the on-board system collect the data of vehicle speed, engine torque, engine speed and so on. The software processes the data into the dynamic information of the total weight of the vehicle and cargo by algorithm, and realizes the supervision of the truck. The other two types of on-board load balancing system install strain/pressure sensors on the axle. By analyzing and processing the signal, the weight detector can get the real-time information of the total weight of vehicle and display it on the vehicle terminal. Users analyze vehicle information through the background management system of internet of vehicles. The above-mentioned on-board weighing system can measure the total weight of vehicles quickly, and effectively avoid the cheating phenomenon existing in the traditional dynamic weighing method, which has good practical value. References | Related Articles | Metrics

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Analysis of Natural Frequency and Decoupling Rate of Mounting System Based on Matlab SONG Xinlei 2021, 46(16): 69-71.  DOI: 10.16638/j.cnki.1671-7988.2021.016.019 Abstract ( )   PDF (1618KB) ( )   The powertrain mounting system is the main component used to reduce the vibration transmission of the powertrain, which plays an important role in the improvement of driving quality. On the basis of summarizing the existing natural frequency and decoupling rate calculation and analysis theory of powertrain suspension system, a series of mathematical models suitable for programming technology suspension system design are established based on Matlab, and realized by GUI interface the stiffness parameters of the suspension system, the inertia parameters of the powertrain and the input of coordinate parameters can improve the development efficiency of the suspension system, and have good practicability and comprehensive promotion and application. References | Related Articles | Metrics

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Analysis and Improvement of Bolt Thread Failure of a Light Truck ZHU Jianren 2021, 46(16): 72-74.  DOI: 10.16638/j.cnki.1671-7988.2021.016.020 Abstract ( )   The wheel bolt is an important safety part of the whole vehicle. If it breaks during driving, it may lead to serious traffic accidents. In this paper, the problem of wheel bolt thread failure occurred on site is investigated, analyzed and finally solved. The influence factors of bolt design, bolt tightening torque and so on were investigated and analyzed by FTA. Finally, it is confirmed that the thread failure of bolt is caused by too small friction coefficient of thread caused by oil contamination of nut. References | Related Articles | Metrics

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Development of Hydraulic System for Two Speed Hybrid Automatic Transmission WU Huaiwei 2021, 46(16): 75-78.  DOI: 10.16638/j.cnki.1671-7988.2021.016.021 Abstract ( )   PDF (1637KB) ( )   In this paper, according to the control requirements of a commercial two-speed hybrid automatic transmission, the hydraulic system is designed, and the dynamic simulation model of the hydraulic system is established. The simulation results are analyzed and the results confirmed that the function of the hydraulic system can meet the control requirements of the automatic transmission. References | Related Articles | Metrics

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Analysis and Improvement of Water Intake Fault of Wiring Harness Plug-in FENG Dianjun 2021, 46(16): 79-81.  DOI: 10.16638/j.cnki.1671-7988.2021.016.022 Abstract ( )   PDF (1174KB) ( )   This paper takes the water intake fault of wiring harness plug-in of an automobile model as an example, this paper analyzes and improves the water inlet fault of automobile wiring harness connector with the method of Datsan, the aim is to eliminate the water inlet fault of automobile wiring harness connector, to improve the safety of automobile, and to meet the needs of users for a better life of safe driving, at the same time, it provides a reference for the later development of the vehicle, and provides a reference for the analysis and improvement of similar failures. References | Related Articles | Metrics

Testing and Experiment

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Study on Key Parameters and Performance Test Method of Intermediate Axis Brake in AMT Light Truck Transmission LI Xiaoxiao 2021, 46(16): 82-85.  DOI: 10.16638/j.cnki.1671-7988.2021.016.023 Abstract ( )   PDF (1924KB) ( )   This article first from the intermediate shaft brake structure, working principle and key parameters of the study, with light truck AMT as the research object to build the test bench, ability according to the existing test bench and test equipment, in the absence of torque meter. Put forward a method of brake performance tests, such as, and on the braking torque and friction coefficient is described in detail how to measure, finally using GSQA, shifting comfort evaluation system for the pressure and speed of acquisition, after fitting method for secondary Origin software, form a complete performance curve, and has carried on the detailed analysis and expounds on curve. References | Related Articles | Metrics

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Application of Double Dynamic Vibration Absorber in Automobile Vibration Control QIAN Yuchen 2021, 46(16): 86-90.  DOI: 10.16638/j.cnki.1671-7988.2021.016.024 Abstract ( )   PDF (1708KB) ( )   The traditional dynamic vibration absorber is widely used in the field of automobile vibration control because of its simple structure and good vibration damping performance. However, due to the invariable parameters of the transmission power vibration absorber and the narrow vibration damping frequency band, when the excitation frequency shifts, the vibration of the controlled object may increase. To solve this problem, this paper proposes a dual dynamic shock absorber. Based on the model of the dual vibration absorber, the analytical solution of the dual vibration absorber is derived, and the vibration damping performance is analyzed. The simulation results show that, compared with the traditional dynamic vibration absorber, the dual dynamic vibration absorber has more stable performance in vibration control. References | Related Articles | Metrics

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Analysis of a Vehicle Generator Based on Finite Element Technology GAO Chan 2021, 46(16): 91-94.  DOI: 10.16638/j.cnki.1671-7988.2021.016.025 Abstract ( )   PDF (2512KB) ( )   This paper uses the finite element analysis method to analyze the alternator with permanent magnets, and simulates rotating machinery such as motors and generators through static structure analysis in simulation software, rotating machinery, and magnetic interfaces. Take the vehicle-use three-dimensional generator model as an example. When the rotor speed reaches 1 000 rpm, the safety factor is obtained within the required safety factor. After that, the material parameters, the rotation speed and the number of turns of the winding are used to generate the induced voltage on the generator. It is found that the coil length multiplication factor has a certain relationship with the total induced voltage of the stator coil. References | Related Articles | Metrics

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Parameter Sensitivity Analysis for Door Gap Design on a Pillar SHAO Wenbin 2021, 46(16): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2021.016.026 Abstract ( )   PDF (2046KB) ( )   In this paper we simply introduce the requirements and influence factors in door gap design on A pillar of the automotive, and analyze the important structural parameters sensitivity for the front door gap. Then find the key factors for door gap design on A pillar, in order to find optimization methods to enlarge the door gap and increase development efficiency and give more freedom to design. References | Related Articles | Metrics

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Mechanism Analysis of Tyre Wear in Strengthened Endurance Test of Vehicle YANG Chunwei 2021, 46(16): 100-104.  DOI: 10.16638/j.cnki.1671-7988.2021.016.027 Abstract ( )   PDF (1555KB) ( )   In view of the phenomenon of inner tread wear and outer shoulder wear of the front wheel of McPherson structure front suspension in the assessment of strengthened durable pavement, the paper analyzes the tyre factors, the stability of four-wheel positioning and the K&C characteristics of suspension. At the same time, with the aid of analytical data collected by means of load spectrum in real vehicle endurance condition, it is concluded that the mechanism of abnormal wear of the front wheel of the suspension structure appears under the condition of enhanced durability. And through the verification of special tire wear test, the rationality of the front wheel inner wear trend under this working condition is expounded, which provides a theoretical basis and analytical method for tire wear verification under the condition of enhanced endurance of similar vehicles. References | Related Articles | Metrics

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Joint Simulation Test Method of EPS Electromechanical Coupling HIL Bench ZENG Kaikai 2021, 46(16): 105-109.  DOI: 10.16638/j.cnki.1671-7988.2021.016.028 Abstract ( )   PDF (3507KB) ( )   To meet the performance development and function safety requirement of EPS system, it is important to build up the effective EPS electronic testing system. PATAC integrate MTS steering performance bench with dSPACE HIL simulator, embed Carsim model to build new EPS HIL test system. Based on this bench, do On Center (OC) handling stability test and Double Lane Change (DLC) test with simulating wheel speed fault for a project. Get the objective test data of OC and the peak torque value of driver obstacle avoidance of DLC, which effectively supports the performance integrated development and functional safety verification of EPS before the real vehicle is available. References | Related Articles | Metrics

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Discussion of the Tyre Abrasion Test CAO Jun 2021, 46(16): 110-113.  DOI: 10.16638/j.cnki.1671-7988.2021.016.029 Abstract ( )   PDF (1587KB) ( )   Vehicle tyres, as an integral component, which has the characteristics of vehicle performance has an important impact. At present the domestic auto plants yet to standardize the test method of the tire performance by experiment. In this paper, the impact on tire performance parameters of the analysis, combined with the German company's test IFT approach, put forward feasible to adapt to China's national conditions tire wear test specification, and thus to validate vehicle performance tires. References | Related Articles | Metrics

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Research on the Influence of Commercial Vehicle Pneumatic ABS Solenoid Valve on the Braking Force of Spring Brake Chamber LI Wenqiang 2021, 46(16): 114-116.  DOI: 10.16638/j.cnki.1671-7988.2021.016.030 Abstract ( )   PDF (1754KB) ( )   GB 7258 Technical Conditions for Safety of Motor Vehicle Operation stipulates that all automobiles (except for three-wheeled vehicles, five-axle and above special operating vehicles) and trailers with a total mass of more than 3 500kg should be equipped with anti-lock braking devices that meet the requirements of the regulations. Pneumatic ABS solenoid valve is widely used in commercial vehicle braking system, which is connected with relay valve, brake chamber, pneumatic disc brake, etc. through brake pipeline. This paper focuses on the analysis of the drop of the parking brake force and the return of the push rod of the spring brake chamber connected with the ABS solenoid valve. References | Related Articles | Metrics

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The Influence of the Relative Radial Displacement of Transmission Bearing Seat on Gear Mesh TE WANG Yanfang 2021, 46(16): 117-119.  DOI: 10.16638/j.cnki.1671-7988.2021.016.031 Abstract ( )   PDF (2402KB) ( )   Establishing E-drive transmission’s housing assembly model based on CETOL software to calculate the relative radial displacement and tolerance between two support bearing seats on housings both for input shaft and output shaft. Using Romax software to set up system analysis model and set different displacement groups on bearing outer rings, then make gear mesh misalignment and TE result comparisons to estimate its influences. References | Related Articles | Metrics

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The Experimental Research on the Timing Tensioner of the Engine XIAO Haiyun 2021, 46(16): 120-122.  DOI: 10.16638/j.cnki.1671-7988.2021.016.032 Abstract ( )   PDF (1858KB) ( )   In order to make the best setup for the timing system, three kinds of hydraulic timing tensioner project with different leakage gaps were designed for the engine, and the dynamic test of the timing system was carried out for every project. Some characteristic parameters of the timing tensioner were tested under different speeds, and these results were analyzed. The results show that the maximum oil pressure values in the high pressure chamber of the three timing tensioners are less than 50 bar, meeting the design requirements. The oil pressure value in the high pressure chamber of the maximum leakage gap project is the minimum among the three projects. Different oil temperature has little effect on the oil pressure of high pressure chamber. Piston motion values are all less than 4.7 mm, and the value of the maximum leakage gap project is the smallest. Therefore, the engine finally chooses to use the timing tensioner with the largest leakage gap value. The test method can measure the dynamic behaviour of engine timing system and provide technical support for the design of timing tensioner. References | Related Articles | Metrics

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Analytic Study for Range-extender Selection YOU Jie 2021, 46(16): 123-125.  DOI: 10.16638/j.cnki.1671-7988.2021.016.033 Abstract ( )   PDF (1072KB) ( )   According to the range extension system scheme design and the matching principle of the range extender. In this paper, the selection of the range extender was analyzed, and the simulation model was established with the help of MATLAB\Simulink platform. Based on the C-WTVC working condition, the performance simulation test of the extender hybrid electric vehicle was completed to determine the fuel economy of the engine and verify the rationality of the range extender selection. References | Related Articles | Metrics

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Fast Prediction Model of Energy Absorbing Structure of Car Body Based on Mechanical Analysis of Thin Walled Beam ZHANG Mengyang 2021, 46(16): 126-129.  DOI: 10.16638/j.cnki.1671-7988.2021.016.034 Abstract ( )   PDF (1266KB) ( )   Based on the mechanics theory of thin-walled beam, combined with the calculation and analysis formula of axial crushing force of thin-walled beam, combined with the physical and mathematical logic of collision analysis, this paper summarizes the input and output variables and calculation logic of the parameter prediction model of energy absorbing structure of car body, and constructs a fast and automatic optimization parameter prediction model with access database tool, which can be realized in the future In the early conceptual design stage, the car body quickly responds to the layout and modeling requirements, and carries out the feasibility check of the collision energy absorption space and the optimization design of the energy absorption structure parameters of the front end of the car body, which greatly improves the design efficiency and avoids the huge cost due to the collision safety risk in the later stage. References | Related Articles | Metrics

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Energy Consumption Analysis of PHEV Based on Dynamic Programming DING Wei 2021, 46(16): 130-133.  DOI: 10.16638/j.cnki.1671-7988.2021.016.035 Abstract ( )   PDF (1722KB) ( )   Aiming at a series of 12 meters long hybrid car in different mileage (CCBC×11, CCBC×13 and CCBC×15) condition, adopt the thermostat control strategy (CD-CS) and dynamic programming (DP) algorithm to calculate the energy consumption. Under DP reverse optimization process, SOC is state variables, the battery output power ss control variables, the simulation results show that under different mileage, DP relative CD-CS to reduce energy consumption by 2.38% to4.54%, which makes full use of the power battery power and embodys the principle of global optimization. The analysis of energy consumption under different mileage shows that the energy saving effect of dynamic programming is better than that of thermostat control strategy with the increase of mileage. References | Related Articles | Metrics

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Research on Vehicle Cycle Condition Based on Determining Sample Size FANG Mingyao 2021, 46(16): 134-137.  DOI: 10.16638/j.cnki.1671-7988.2021.016.036 Abstract ( )   PDF (3036KB) ( )   Based on the bus line strength, taking into account the bus operation area, operation type and the proportion of the number of buses in each area, 20 bus lines were selected, and the driving data of 20 buses were collected by on-board data acquisition equipment, a total of 11 370 170 effective driving data were obtained. Using the discrete coefficient of statistics to determine the required sample size, using MATLAB programming to achieve the overall effective test data of short trip division, principal component analysis (PCA) and K-means clustering analysis, a driving cycle of 1 250 s in Zhengzhou city was constructed based on the determined sample size, in line with the traffic characteristics of Zhengzhou city. References | Related Articles | Metrics

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Lightweight Research on Aluminum Alloy Bracket of a Light Truck Battery Based on NASTRAN MI Fuzheng 2021, 46(16): 138-140.  DOI: 10.16638/j.cnki.1671-7988.2021.016.037 Abstract ( )   PDF (1926KB) ( )   In order to reduce the lightweight servicing weight and promote the blue brand goal of the whole vehicle,based on NASTRAN finite element simulation software, this paper collects the acceleration data of the battery bracket in Xiangyang test field, and carries out CAE modal and strength comparative analysis on the lightweight scheme. The results show that the lightweight scheme meets the design target requirements, and the lightweight effect is significant. References | Related Articles | Metrics

Process and Equipment

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The Application of Cubing in Auto Parts Matching Analysis ZHANG Ding 2021, 46(16): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2021.016.038 Abstract ( )   PDF (1848KB) ( )   This article mainly investigates the application of Cubing, which often used in automotive companies for the matching analysis of the parts. The application of Cubing could improve the quality of the vehicle, control the stability of parts, speed up the optimization of parts and shorten the development cycle of parts, which includes parts of precision assembly, Cubing workshop, limit warning, based on the installation datum corrective measure datum, etc. References | Related Articles | Metrics

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Development of Broad-Spectrum Shock Absorber Stretch Machine for Truck Chassis Assembly Line HE Yanxia 2021, 46(16): 145-147.  DOI: 10.16638/j.cnki.1671-7988.2021.016.039 Abstract ( )   PDF (2162KB) ( )   This paper introduces the structure, principle and working range of a self-made broad-spectrum shock absorber stretching machine. The machine has an initial length adjustment device for shock absorbers and a stroke quick change device, which can meet the stretching requirements of shock absorbers of different models with different specifications and different mounting lengths. In order to quickly switch the production of multiple chassis on a chassis assembly line. It overcomes many shortcomings of the shock absorber stretching machine purchased on the market, and is suitable for most truck manufacturers in China. References | Related Articles | Metrics

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Design and Application of Flange Plate JIAO Xiyin 2021, 46(16): 148-150.  DOI: 10.16638/j.cnki.1671-7988.2021.016.040 Abstract ( )   PDF (2353KB) ( )   The invention relates to a practical and portable flange plate measuring clamp in this paper, which realizes simultaneous measurement of a plurality of flanges by combining a three-coordinate measuring principle, realizes the positioning function of the flanges by using the clamp, and realizes the programming of the plurality of flanges into a measuring program by using the measuring principle of a three-coordinate measuring machine, and only needs to manually collect a starting coordinate system once to complete simultaneous measurement of the plurality of flanges, thereby saving the time for manually collecting the starting coordinate system of each flange plate in the middle and achieving the purpose of improving the measuring efficiency. References | Related Articles | Metrics

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Pressing Force of the Bushing Optimization and Verification LEI Liang 2021, 46(16): 151-154.  DOI: 10.16638/j.cnki.1671-7988.2021.016.041 Abstract ( )   PDF (2888KB) ( )   This paper makes full use of 8D analysis method and explain the function of each stage of 8D analysis. Combined with the actual failure situation, carried out the parts with the effective analysis, verification and implementation. Thus, the influence factors of the pressing force of the bush structure are analyzed comprehensively and systematically. Theoretically, the effects of interference, fit length and friction coefficient of swing arm seat and bushing are clarified. Through the verification of the product, it shows that the method has the effectiveness and rationality of solving problems, and provides us with the direction of solving similar problems, which has guiding significance. References | Related Articles | Metrics

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Study on New Technology of Bulkhead Fixation of Large Volume Aluminum Alloy Fuel Tank ZHANG Lei 2021, 46(16): 155-157.  DOI: 10.16638/j.cnki.1671-7988.2021.016.042 Abstract ( )   PDF (2204KB) ( )   This paper introduces a new technology to fix the bulkhead of aluminum alloy fuel tank with large volume (over 400L). Through production verification and after-sale feedback, the new technology of plate fixed effectively overcome the barrier of tractor aluminum tank mobility problems, diaphragm loose rock lead to a large number of aluminum powder, to form a new failure mode, the new craft not only make the diaphragm assembly more solid, so as to improve the service life of aluminum tank, and improved the car of tractor user experience. References | Related Articles | Metrics

Standards Regulations Management

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Research on the Value of IATF16949 Quality System to Heavy Truck Parts Manufacturing Enterprises JIN Zhe 2021, 46(16): 158-161.  DOI: 10.16638/j.cnki.1671-7988.2021.016.043 Abstract ( )   PDF (987KB) ( )   As the main component of the whole vehicle, the quality of parts and components often affects the quality of the whole vehicle. Once the quality of the parts does not meet the qualified standards, it will pose a certain threat to the life and safety of consumers and cause accidents. This article discusses and researches heavy truck parts manufacturing enterprises based on the IATF16949 quality management system, analyzes the status of parts production based on the actual operation of the company, conducts strategic research on the quality control of the parts production process, and proposes IATF16949 quality management system improvement suggestions. It provides a useful reference for the quality management activities of parts production. References | Related Articles | Metrics

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Analysis of Management Model of Automotive Interior and Exterior Trim Development Team LI Qingli 2021, 46(16): 162-164.  DOI: 10.16638/j.cnki.1671-7988.2021.016.044 Abstract ( )   PDF (1658KB) ( )   With the increase of competition in the automobile industry, interior and exterior part is one of the important components of vehicle parts. The management model of interior and exterior project team is particularly prominent for the efficiency of vehicle development and the product competitiveness. In this paper, put forward the flexible matrix derivative model structure of project management, to gradually improve project development project team management, so as to achieve lower development costs, improve product strength of purpose. References | Related Articles | Metrics

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Application of VAVE in New Energy Vehicle Industry LIU Wei 2021, 46(16): 165-168.  DOI: 10.16638/j.cnki.1671-7988.2021.016.045 Abstract ( )   PDF (1042KB) ( )   In the context that China is the main battlefield of new energy vehicles in the world, combined with the unfavourable factors such as the gradually declining of state subsidies and the continuous downward price pressure from the domestic Tesla Model 3, the design cost of mass-produced vehicles can be continuously optimized by relying on VAVE management tools, the aim of which is to improve the comprehensive quality-price ratio of products, without making compromise to the product quality and customer perception. Practice shows that VAVE is a powerful tool to improve the product competitive of new energy vehicles. References | Related Articles | Metrics

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The Analysis on CCC Certification for Automobiles Brake Linings TAO Yingchao 2021, 46(16): 169-171.  DOI: 10.16638/j.cnki.1671-7988.2021.016.046 Abstract ( )   PDF (1103KB) ( )   As automobile brake linings by production license directory management to mandatory product certification management, automobile brake linings has been classified into the scope of CCC certification management, based on automobile brake linings for the first time a CCC parts, this paper introduces the automobile brake linings of CCC authentication model and the basic process, rules for CCC certification, type test of inspection items and technical requirements, summed up experience of brake linings CCC certification, detailed analysis of the brake linings CCC certification procedures and methods. It provides a strong reference value for the certification of related brake linings manufacturers in the future, so as to jointly improve the standard compliance and quality level of brake linings products. References | Related Articles | Metrics

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Commercial Evaluation Method for NVH Performance of Passenger Cars QIN Weichao 2021, 46(16): 172-174.  DOI: 10.16638/j.cnki.1671-7988.2021.016.047 Abstract ( )   PDF (1042KB) ( )   This paper mainly from the powertrain and accessories NVH performance, vehicle driving NVH performance and all kinds of switch NVH performance three aspects, combined with static and dynamic, according to different projects and road conditions to carry out commercial evaluation of NVH performance, and finally form a more complete set of commercial evaluation method of passenger car NVH performance, to guide the evaluation personnel to carry out the work. References | Related Articles | Metrics

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Relevant Suggestions on Inspection and Appraisal of Vehicle Safety Performance in Road Traffic Accident ZHAO Chunling 2021, 46(16): 175-177.  DOI: 10.16638/j.cnki.1671-7988.2021.016.048 Abstract ( )   PDF (1005KB) ( )   In recent years, the inspection and identification of vehicle safety performance in China has made obvious progress, but it still faces some problems to be solved, which has a certain negative impact on the normal development of inspection and identification work. Therefore, this paper focuses on the in-depth analysis of the inspection and identification of vehicle safety performance in road traffic accidents,then the comprehensive, comprehensive study of the existing problems in the inspection and identification, and finally put forward targeted suggestions and countermeasures, in order to expect the level of our country's road traffic accident vehicle safety performance inspection and identification to be improved. References | Related Articles | Metrics

Overview

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Review of Research on Reinforcement Learning in Hybrid Electric Vehicle Energy Management CHEN Xin 2021, 46(16): 178-180.  DOI: 10.16638/j.cnki.1671-7988.2021.016.049 Abstract ( )   PDF (1304KB) ( )   Hybrid electric vehicles are considered to be a feasible technical approach to balance long-term mileage and low energy consumption, and energy management strategy technology is one of the key technologies of hybrid electric vehicles. At present, reinforcement learning (RL) is beginning to be applied in hybrid electric vehicle energy management strategies, which is an important method for formulating effective energy management strategies. In this article, the energy manage -ment problems of hybrid electric vehicles are described, analyzed and summarized, and various application status and trends of RL algorithms and RL-based hybrid algorithms in the energy management of hybrid electric vehicles are summarized. References | Related Articles | Metrics

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Research Status and Development Trend of Internal Thread Cold Extrusion Process CHEN Qiang 2021, 46(16): 181-185.  DOI: 10.16638/j.cnki.1671-7988.2021.016.050 Abstract ( )   PDF (3529KB) ( )   First, the characteristics and performance requirements of cold-extruded internal threads are introduced, and the differences between extruded internal threads and cutting internal threads are listed in this paper. Secondly, the development history and research status of the internal thread cold extrusion net forming process at home and abroad are introduced, and the principle of internal thread cold extrusion technology and the internal thread forming effect are explained. Finally, the future development trend of the internal thread cold extrusion net forming process is prospected. References | Related Articles | Metrics

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Based on the Principle Research of Electric Power Steering System HE Lin 2021, 46(16): 186-188.  DOI: 10.16638/j.cnki.1671-7988.2021.016.051 Abstract ( )   PDF (1286KB) ( )   This paper mainly describes the basic working principle and related structure of the electric power steering system in the process of vehicle driving, and through the analysis of the relevant characteristics and performance of the electric power steering system, to verify that the steering system can improve the operation stability and fuel economy of electric vehicles.Through the analysis of steering system type and control technology to carry on the functional level of the research in this paper, the future application of electric power steering system has a certain reference significance. References | Related Articles | Metrics

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Research on the Development of the Auto Parts Industry SUN Hongtao 2021, 46(16): 189-191.  DOI: 10.16638/j.cnki.1671-7988.2021.016.052 Abstract ( )   PDF (1302KB) ( )   As the front-end industrial chain of the automotive industry, the automobile parts industry has a great impact on the comfort, reliability, safety of automotive products, the development direction of parts and components is closely related to the development of the whole vehicle. This paper makes clear the future development trend of the auto parts industry by analyzing the development trend of the auto parts industry, the requirements of the whole vehicle development for the parts industry. References | Related Articles | Metrics

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Discussion on the Application of Vehicle Sampling Verification Test in Vehicle Development WANG Qiyue 2021, 46(16): 192-194.  DOI: 10.16638/j.cnki.1671-7988.2021.016.053 Abstract ( )   PDF (1634KB) ( )   In order to improve the experience of car buyers and reduce the short mileage fault or even "zero kilometer" fault of vehicles, it is particularly important to carry out the vehicle sampling test for the newly developed models before they complete the mass production preparation and mass production but enter the market terminal sales. This paper mainly introduces a kind of test method which uses the special test site and the corresponding evaluation form to carry out the pre marketing sampling inspection of the newly developed vehicle to confirm the initial quality of the product and the aspects to be improved. References | Related Articles | Metrics

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Application Analysis of Charging and Swapping Technology for New Energy Vehicles WANG Qinghai 2021, 46(16): 195-197.  DOI: 10.16638/j.cnki.1671-7988.2021.016.054 Abstract ( )   PDF (1732KB) ( )   At present, the energy supply methods of new energy vehicles mainly include conduction charging, wireless charging and electricity changing, each of which has its own applicable fields and consumer groups. This paper will analyze the means of electric vehicle supplement range, compare the development trend of relevant technology at home and abroad, and analyze the development direction of charging/changing technology, so as to provide reference for peers. References | Related Articles | Metrics

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Analysis of the Development Ideas of Vehicle Electronic and Electrical Architecture LI Tingkai 2021, 46(16): 198-200.  DOI: 10.16638/j.cnki.1671-7988.2021.016.055 Abstract ( )   PDF (2828KB) ( )   Based on the characteristics and limitations of the current electrical architecture, this paper analyzes the Tesla architecture, and points out that the future development trend of automotive electronic and electrical architecture is mainly centered on a powerful communication architecture and a vehicle level computing platform. Through the planning of the future electrical architecture of Ambrose and General Motors, it is pointed out that the automotive electronic and electrical architecture is the first step of the transformation of automobile enterprises. In the future development, each OEMs should plan the platform-based electronic and electrical architecture according to their own actual situation. References | Related Articles | Metrics

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Analysis on Lightweight Design of Electric Vehicle Body SHAO Zhicun 2021, 46(16): 201-203.  DOI: 10.16638/j.cnki.1671-7988.2021.016.056 Abstract ( )   PDF (1160KB) ( )   With the continuous improvement of people's living standards, China's domestic car storage is also increasing year by year, but the increase of car ownership will also lead to the increase of vehicle exhaust emissions. In recent years, China has put forward the construction goals of "green water and green mountains are golden mountains and silver mountains", and the country has paid more and more attention to the earth environment. Electric vehicles use electricity as vehicle energy, which is clean, environment-friendly and pollution-free. New energy vehicle enterprises such as BYD and Geely have emerged in China. Compared with gasoline vehicles, the battery of electric vehicles accounts for the main part of the weight of the whole vehicle. In order to make the vehicle faster in the case of safety, it is particularly important to carry out lightweight research on electric vehicles. The article proposes a lightweight design scheme for the body of an electric car, and puts forward some suggestions. References | Related Articles | Metrics

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Analysis on the Application of Car Body Trace Identification in Road Traffic Accidents CHEN Zhen 2021, 46(16): 204-206.  DOI: 10.16638/j.cnki.1671-7988.2021.016.057 Abstract ( )   PDF (1035KB) ( )   In the research process, the paper uses literature research method and case analysis method to analyze the application of vehicle body trace identification in road traffic accidents, and strives to continuously improve the application effect of vehicle body trace identification in road traffic accidents. In the process of discussion, the tire pattern inspection technology, the whole separation trace inspection technology, the form trace inspection technology and the trace material evidence inspection technology are introduced in detail. On this basis, some concrete measures are put forward to strengthen the application of trace inspection technology in traffic accidents, including increasing the investment of science and technology, improving the technical level, strengthening the importance of trace detection and fully understanding the importance of trace inspection in traffic accidents. References | Related Articles | Metrics

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Application Analysis of Lightweight Components in Automobile Refitting TANG Chengzhang 2021, 46(16): 207-209.  DOI: 10.16638/j.cnki.1671-7988.2021.016.058 Abstract ( )   PDF (960KB) ( )   The light-weight parts play an important role in automobile refitting. This article will analyze and discuss the selection and analysis of the lightweight parts, the advantages of the lightweight parts to refit the automobile, and the development prospect of the lightweight parts, and compare the advantages and disadvantages of the new and old parts in the performance. References | Related Articles | Metrics

Automobile Education

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Practice and Exploration of the Reform of the Examination Mode of Automobile Specialty Course —Taking the Foundation of Mechanical Design as an Example XIAO Luyun 2021, 46(16): 210-212.  DOI: 10.16638/j.cnki.1671-7988.2021.016.059 Abstract ( )   PDF (1443KB) ( )   In order to explore the practical effect of the reform of the examination mode of automobile professional courses in local universities for nationalities, improve the core competitiveness of the students, and promote their better employment, taking the course of mechanical design foundation as an example, the mixed teaching mode of online and offline teaching is adopted. In view of this course, the implementation of "N+1+1" course assessment method, through the analysis of course goal achievement degree and students' feedback to test the effectiveness of teaching reform, hope that this new course assessment method can provide some reference and inspiration for the improvement of automobile professional training mode in Local Universities for nationalities. References | Related Articles | Metrics

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Exploration on the Cultivation of High Skilled Talents of New Energy Vehicle Technology Specialty in Higher Vocational Colleges Based on 1+X Certificate System GUO Zhongqing 2021, 46(16): 213-215.  DOI: 10.16638/j.cnki.1671-7988.2021.016.060 Abstract ( )   PDF (1032KB) ( )   This paper first summarizes the relevant contents of the 1+X certificate system, then clarifies the development of the new energy vehicle technology industry department, the training requirements for talents, and the specific analysis of the vocational skill level of new energy vehicle technology, and finally puts forward a series of main strategies and measures for the cultivation of high skilled talents of new energy vehicle technology specialty in Higher Vocational Colleges under the background of the 1+X certificate system. References | Related Articles | Metrics

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Exploration and Reform of Ideological and Political Courses in Higher Vocational Colleges —Taking Auto Parts Management as an Example GAO Wei 2021, 46(16): 216-218.  DOI: 10.16638/j.cnki.1671-7988.2021.016.061 Abstract ( )   PDF (1242KB) ( )   In order to further cultivate students' home countries and correct values, professional quality, etc., in this paper, the auto parts management course as an example, puting forward course ideological educational target, fully excavating course ideological elements. Actively exploring in the revision of the syllabus, teaching design, teaching process optimization, perfecting examination aspects, tightly grasping the key points, achieving a good ideological and political effect of the course. References | Related Articles | Metrics

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The Teaching Reform and Practice of Ideological and Political Education in the Automobile Structure Course GAO Congcong 2021, 46(16): 219-221.  DOI: 10.16638/j.cnki.1671-7988.2021.016.062 Abstract ( )   PDF (1499KB) ( )   The course of automobile structure is the foundation and core course in the course system of automobile engineering. This paper first describes the present situation of automobile structure courses. On this basis, the author puts forward some concrete measures to carry out the curriculum ideological and political teaching reform in automobile structure course. Through the ideological and political education reform of the course, students are not only taught professional knowledge, but also imperceptibly trained to improve the spirit of great nation craftsman, the national sentiment of serving the country by science and technology, consciousness of engineering ethics and sense of responsibility. The vehicle engineering students not only have solid theoretical foundation, but also have to take on responsibilities and become reliable successors of China’s automotive industry. References | Related Articles | Metrics

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Research on the Teaching Mode of "Automobile Computer and Bus Technology" Based on "Internet+Ideological and Political Education for Curriculum" 2021, 46(16): 222-224.  DOI: 10.16638/j.cnki.1671-7988.2021.016.063 Abstract ( )   PDF (1061KB) ( )   Today, on-line teaching of professional courses on Internet platform has become the main direction of development, and Ideological and political education is the key to establish morality and cultivate people, universities are deepening the reform of "ideological and political work of curriculum". In the automotive program, The automobile computer and the bus technology carries on the teaching by "internet+ideological and political education for curriculum" the union innovation teaching education pattern. This paper discusses the teaching contents, teaching methods and evaluation of teaching effect after the integration of automobile computer and bus technology into the course of ideology and politics, and provides ideas for the development of ideological and political work in the course of automobile specialty. References | Related Articles | Metrics