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30 March 2023, Volume 48 Issue 6 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
New Energy Vehicle
Testing and Experiment
Process and Equipment
Use and Maintenance
Automobile Education
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New Energy Vehicle

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Three-electric Layout Strategy of Pure Electric Platform XU Han 2023, 48(6): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2023.06.001 Abstract ( )   PDF (2737KB) ( )   In order to make the vehicle have better driving range, better planning and layout of the interior space, but also with high safety and high intelligence, pure electric platform came into being. The layout strategy of the core part like motor, battery and motor controller of the pure electric platform has a significant impact on the properties of the platform. Starting from the development of a pure electric platform, this paper studies the influence of different three-electric layout strategies on space, collision safety, vehicle endurance, vehicle model expansion, etc. By choosing different three-electric layout strategies, the original pure electric platform can better fit the platform positioning, with stronger expansion, larger internal space and better performance, and provide detailed reference for the early strategy setting of the pure electric platform. References | Related Articles | Metrics

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Lithium Battery Pack for Electric Vehicle Based on Multi-layer Equalization Balanced Optimization Design LIU Jiaxuan 2023, 48(6): 5-9.  DOI: 10.16638/j.cnki.1671-7988.2023.06.002 Abstract ( )   PDF (1388KB) ( )   Due to the production and operation conditions of electric vehicle power battery pack, the battery quantity in the battery pack is inconsistent, resulting in a series of problems such as reduced battery life and increased safety risk. This paper proposes a multi-layer equalization scheme based on the traditional inductive active equalization scheme. In this scheme, the first layer takes the battery state of charge (SOC) as the equalization parameter, and the upper layer takes the battery operating voltage as the equalization parameter. The energy transfer between battery packs is achieved through the comprehensive effect of the multi-layer equalization system. On the basis of the scheme, eight batteries were taken as examples to establish a Simulink simulation model and carry out constant current charging, static and constant discharge three simulation tests. Through the simulation test, the SOC of each battery in the above three working conditions tends to be consistent over time. The simulation results show that the scheme can effectively complete the energy transfer task under charging, static and discharge conditions, and balance the electric energy of the battery pack, which confirms the effectiveness of the scheme. References | Related Articles | Metrics

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Thermal Management Method of Pure Electric Vehicle Power Battery in Low Temperature Environment LI Guanzhong 2023, 48(6): 10-16.  DOI: 10.16638/j.cnki.1671-7988.2023.06.003 Abstract ( )   PDF (2187KB) ( )   Pure electric vehicle power batteries will have a sharp decline in working efficiency in low temperature environment. This paper designs a corresponding thermal management scheme for this problem. In low temperature environment, positive temperature coefficient (PTC) heating system with feedback regulation function is used to preheat the automobile power battery before the electric vehicle motor starts to work. The four-way valve connects the battery of the cooling fluid with the motor circuit to form a new circulation circuit. After the motor starts running, comparing the change of battery temperature under the synergistic action of PTC heating system and motor residual heat under low temperature, it is found that the PTC+drive system residual heat heating mode has high heating efficiency and low energy consumption. Therefore, a low temperature heat management method is proposed, which uses the heat generated by PTC heating system and motor to heat or keep warm the battery through the cooling fluid circulation system. To compensate for the shortage of single energy in pure electric vehicles, the above heat management methods are derived from the battery-supercapacitor hybrid storage system, which ensures that the battery power of electric vehicles will not be greatly discounted by the consumption of the heat management system. References | Related Articles | Metrics

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Numerical Analysis of Crush Failure of New Energy Power Battery Pack CHENG Sheng 2023, 48(6): 17-21.  DOI: 10.16638/j.cnki.1671-7988.2023.06.004 Abstract ( )   PDF (3390KB) ( )   A method based on generalized incremental stress state dependent damge model (GISSMO) material fracture criterion and LS-DYNA software for finite element analysis is proposed to establish an experimental numerical model, against the large-area material tearing failure behavior of new energy power battery pack crush. Through the design of failure physical samples, uniaxial tensile and bulging test of materials are carried out to calibrate the failure plastic strain values under different stress triaxial states, and the cumulative damage parameter is also introduced to consider the effect of cumulative damage factors. By three point bending experiment is used to correct the material failure constitutive model, and comparing the results of pack crush experiment and simulation, it is found that the failure area, location and process failure behavior of materials have good consistency, and the force-displacement curve of crush has a high coincidence. It is proved that the failure calculation model based on GISSMO material fracture criterion obtained in this paper can accurately predict the crack generation and material failure when the power battery pack is squeezed and destroyed. References | Related Articles | Metrics

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A Self-learning Control Strategy for Pure Electric Vehicles ZHAO Shuang 2023, 48(6): 22-26.  DOI: 10.16638/j.cnki.1671-7988.2023.06.005 Abstract ( )   PDF (798KB) ( )   The battery is the power source of electric vehicles. However, with the increase of service time, its inherent characteristics (such as capacity)will change, and the relevant information displayed on the instrument will also have errors, which will bring confusion to users. Therefore, this paper proposes a self-learning strategy to correct the information display error caused by the attenuation of the inherent properties of the battery. Mobile phones and internet enterprises can analyze the big data used by users, so as to push their intended content for users and improve the user experience. Compared with traditional non-network connected vehicles, intelligent vehicles can also use vehicle control unit (VCU) to store user vehicle data, conduct independent analysis and over the air (OTA) upgrade correction factors to correct the error of charging time and available residual power display, and score the driver's behavior, so as to achieve the strategy of vehicle independent learning. At present, this strategy has been applied to mass production of 20 000 vehicles, and the market response is good. It greatly improves the user experience. References | Related Articles | Metrics

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Thermal Management Performance Analysis of Power Battery Based on Microchannel Liquid Cooling MA Liya 2023, 48(6): 27-30.  DOI: 10.16638/j.cnki.1671-7988.2023.06.006 Abstract ( )   PDF (942KB) ( )   For the battery to effectively thermal management, this paper proposes a thermal management method using microchannel liquid cooling. Based on COMSOL software, a simulation study of a lithium iron phosphate flexible battery was conducted to analyze the influence of coolant flow rate and coolant inlet temperature on the cooling performance of the battery module at different discharge rates. The results show that the maximum temperature difference and maximum temperature of the battery pack can be controlled in the allowed range by cooling method.Increasing coolant flow can reduce the maximum temperature and temperature difference of the battery pack to a certain extent, but the loss of pumping power needs to be considered. Reducing the coolant inlet temperature is an effective way to reduce the maximum temperature of the battery module, and the coolant inlet temperature has little influence on the temperature consistency of the battery pack. References | Related Articles | Metrics

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Wind Noise Optimization Control Method of a Pure Electric Vehicle LI Teng 2023, 48(6): 31-35.  DOI: 10.16638/j.cnki.1671-7988.2023.06.007 Abstract ( )   PDF (1264KB) ( )   To address the problem that wind noise is more obvious in pure electric vehicles without the mask of engine noise, the main focus is to sort out the mechanism of wind noise generation and the development process of wind noise performance, and then to control the wind noise of pure electric vehicles from the early stage of design, analyse the typical problems in the development process, combine with actual cases to avoid the problems and avoid wind noise problems in real vehicles. The wind noise of the final production vehicle is subjectively evaluated as good, and the objective test meets the preliminary wind noise development target, which verifies the effectiveness of the design scheme. References | Related Articles | Metrics

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Parameter Matching of Hybrid Electric Vehicle Power System Based on Cruise LI Mingze 2023, 48(6): 36-40.  DOI: 10.16638/j.cnki.1671-7988.2023.06.008 Abstract ( )   PDF (1016KB) ( )   In this paper, a hybrid electric vehicle is discussed, determine the vehicle performance objectives, according to the vehicle specific parameters of the engine, motor, battery and other main components of the power system parameters calculation and selection, design automated mechanical transmission (AMT) and continuous variable transmission (CVT) transmission schemes; A simulation model was built in CRUISE software to test the maximum speed, acceleration, climb and other dynamic indicators to verify whether the parameter matching is reasonable. The influence of different transmission schemes on fuel consumption was tested by economic simulation under new european driving cycle (NEDC) cycle condition. Simulation results show that the vehicle dynamics meet the requirements, the power system parameters are reasonably selected, the engine operation efficiency of the CVT transmission scheme is higher. References | Related Articles | Metrics

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Diagnosis and Optimization Analysis on Motor Whistling Noise of Electric Vehicle LI Jianhua 2023, 48(6): 41-46.  DOI: 10.16638/j.cnki.1671-7988.2023.06.009 Abstract ( )   PDF (4141KB) ( )   In order to solve the problem of larger whistling noise under WOT condition and sliding to 20 km/h condition of electric vehicle, through the analysis model of “excitation source-transmission path-recipient”, the cause and transmission mechanism of motor whistling noise are analyzed. and the main contribution of two different whistling noise problems are quickly locked according to the analysis and engineering experience. The key factor of whistling noise in the vehicle under WOT condition is the large radiated noise of the motor, and the key factor of whistling noise in the vehicle under cruise down condition is the resonance of rear mount bracket. From the aspect of transmission path, the optimization scheme of motor acoustic material wrapping and rear mount bracket strengthening is put forward. Through the comparative test analysis of optimized scheme, the optimization rectification scheme is effectively determined to solve the motor whistling noise problem. The optimization scheme and analysis ideas have good guiding significance for solution the motor whistling noise of other car models. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Design of Vehicle Terminal Based on OBD and GPS WANG Jia 2023, 48(6): 47-52.  DOI: 10.16638/j.cnki.1671-7988.2023.06.010 Abstract ( )   PDF (3537KB) ( )   Aiming at the shortage that the existing vehicle terminal can't connect with the third-party specific cloud service platform, a general vehicle terminal based on automotive on-board diagnostics (OBD) technology and global positioning system (GPS) technology is designed. The vehicle terminal is based on STM32F103ZET6 single chip microcomputer, and is composed of GPS module, 4G communication module, liquid crystal display (LCD) and so on. Vehicle terminal obtains OBD data stream through automobile controller area network (CAN) bus, obtains automobile position data through GPS module, and communicates with cloud server through 4G communication module. The experimental results show that the vehicle terminal works stably and reliably, can read the OBD data stream of the vehicle, accurately obtain the positioning data of the vehicle, and send the data to multiple cloud servers in real time, and can receive the data information sent by the cloud servers, thus realizing the functions of remote monitoring of the vehicle, road risk warning and other networking. References | Related Articles | Metrics

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Analysis on the Development Status and Strategy of Intelligent Connected Vehicles in China WANG Huijie 2023, 48(6): 53-57.  DOI: 10.16638/j.cnki.1671-7988.2023.06.011 Abstract ( )   PDF (863KB) ( )   With the rapid development of science and technology, intelligent and connected vehicles have become the trend of the future development of the automobile industry. At present, intelligent networked vehicles are accelerating towards the stage of smart travel, and the penetration rate is increasing year by year, while improving traffic efficiency and reducing traffic accidents, which has greatly changed people's lifestyles. However, it is also affected by problems such as imperfect laws and regulations and road test management, as well as data insecurity. Based on this, this paper first analyzes the development status of intelligent connected vehicles, and then analyzes the problems faced by the development of intelligent connected vehicles. Finally, in view of the current problems in the development of intelligent and connected vehicles, the strategy of adapting to the effective development of intelligent connected vehicles is proposed, which effectively solves the problems faced by the development of intelligent and connected vehicles at present, and also provides a reference idea for the development of intelligent and connected vehicles. References | Related Articles | Metrics

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Application Algorithm of Vehicle LIDAR DU Hailin 2023, 48(6): 58-63.  DOI: 10.16638/j.cnki.1671-7988.2023.06.012 Abstract ( )   PDF (854KB) ( )   With the rapid development of automatic driving, the application of light detection and ranging (LIDAR) in this field is more and more extensive. The fastest-growing of lidar provides another way for the intelligent connected vehicle in target tracking and recognition. Based on the application of vehicle lidar in the automatic driving industry, this paper introduces three application algorithms of vehicle lidar. Target tracking and recognition algorithm is used to estimate and predict the movement state of obstacles through target tracking algorithm, evaluate the safety level of obstacles and driverless vehicles in real time, and make corresponding decisions. Simultaneous localization and mapping (SLAM) algorithm is an advanced algorithm for robot to locate its position and pose in unknown environment. Point cloud segmentation is often the basis of object recognition and map construction. Through the description of six commonly used segmentation algorithms, the characteristics of the algorithms are analyzed, which provides a reference for the selection of algorithms in different application scenarios. References | Related Articles | Metrics

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The Application of V2X Technology in Communication System Architecture BO Tao 2023, 48(6): 64-68.  DOI: 10.16638/j.cnki.1671-7988.2023.06.013 Abstract ( )   PDF (1185KB) ( )   The performance benefits of vehicle to everything (V2X) communication technology have slowly come to be appreciated in recent years. This technology communication technology can not only effectively make up for sensor defects of single car autonomous driving, but also combine with infrastructure construction to create intelligent transportation systems. In this paper, the two major development routes of V2X technology are compared and analyzed, and the main communication modes of long term evolution (LTE) -V2X are described. Based on the current LTE-V2X network architecture, a software-defined communication recovery function module is designed to introduce into V2X technology, which can effectively improve the communication efficiency and ensure normal link switching and recovery. References | Related Articles | Metrics

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Circuit Detection Optimization Algorithm Based on Kalman Filter LIU Xinning 2023, 48(6): 69-75.  DOI: 10.16638/j.cnki.1671-7988.2023.06.014 Abstract ( )   PDF (1895KB) ( )   In order to verify the application effect of the Kalman filter algorithm in the detection of the smart car track, the Infineon TC264 microcontroller is used as the main controller, and the grayscale image of the track is collected through the camera. According to the pixel matrix of the black and white image, combined with software programming and proportion integration differentiation (PID) algorithm, the duty cycle of the motor and the steering gear is calculated, and the forward direction of the car is correctly controlled, thereby realizing the tracking function. After the car can track normally, the Kalman filter algorithm is embedded in the original algorithm, and the specific application effects of the two algorithms on the car are compared. After continuous debugging, the car can realize the tracking function, the speed can reach 1.4 m/s, and after adding the Kalman algorithm, the car can predict the track ahead. The experimental results show that the Kalman filter algorithm can optimize the track recognition. References | Related Articles | Metrics

New Energy Vehicle

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Control System of NOx Sensor for New Diesel Vehicles ZHANG Mingming 2023, 48(6): 76-80.  DOI: 10.16638/j.cnki.1671-7988.2023.06.015 Abstract ( )   PDF (1214KB) ( )   Nitrogen and oxygen sensors play an important role in the after-treatment system of heavy-duty diesel vehicles. In order to improve the accuracy of nitrogen and oxygen content detected by nitrogen and oxygen sensors in different atmospheres and reduce measurement errors, a nitrogen and oxygen sensor control strategy with improved voltage constant value feedback is proposed. This strategy can set the reference voltage of the first chamber in the voltage constant value feedback control according to the oxygen concentration in the exhaust gas, to increase the oxygen pumping flexibility of nitrogen oxygen ceramic core main pump. By setting the reference value of the pump current of the auxiliary pump and adjusting the voltage applied at the two poles of the main pump in real time, the actual value of the auxiliary pump current can be stabilized around the reference value, which can improve the oxygen efficiency of the auxiliary pump and reduce the measurement error caused by oxygen leakage. Experiments show that the control strategy can realize the accuracy, stability and reliability of nitrogen and oxygen concentration detection by nitrogen and oxygen sensor under different oxygen concentration. References | Related Articles | Metrics

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Transient Study of Flow Field Inside Air Atomizing Nozzle WU Yuxuan 2023, 48(6): 81-84.  DOI: 10.16638/j.cnki.1671-7988.2023.06.016 Abstract ( )   PDF (1113KB) ( )   In order to better understand the flow condition inside the air atomizing nozzle, a threedimensional model of the nozzle is established by using modeling software. The transient process of the flow inside the nozzle model is numerically simulated by large eddy simulation in Fluent software under the condition of air pressure of 0.031 MPa and liquid flow of 10 L/h, 15 L/h and 20 L/h respectively. By extracting and analyzing the pressure, velocity and gas volume fraction parameters on the central axis and different sections of the nozzle, the flow characteristics of the flow field inside the nozzle are obtained, which provided a theoretical basis for improving the atomization quality of the air atomizing nozzle as well as the research and development of the design. References | Related Articles | Metrics

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Analysis of the Matching between Power System and Drive-by-wire Chassis of Intelligent Networked Patrol Vehicle YUAN Yuehui 2023, 48(6): 85-88.  DOI: 10.16638/j.cnki.1671-7988.2023.06.017 Abstract ( )   PDF (1098KB) ( )   Intelligent networked patrol vehicle; Power system; Power matching; Drive-by-wire chassis References | Related Articles | Metrics

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Improvement of Main and Auxiliary Fuel Switching System of a Special Vehicle HUO Yurong 2023, 48(6): 89-92.  DOI: 10.16638/j.cnki.1671-7988.2023.06.018 Abstract ( )   PDF (990KB) ( )   For special vehicles limited by the installation space and range of various requirements, the main and auxiliary fuel tanks are usually arranged on the left and right sides, which also brings the vehicle in the side slope driving or damage to the fuel tank and other conditions, can not ensure the normal running of the vehicle. This paper provides a kind of special automobile fuel switching system, can realize the main fuel tank and oil switch, ensure vehicle main fuel tank and each other and with the function of redundancy as, in order to improve the range of the vehicle, solve the vehicle travels side slope fuel tank fuel overflow problems in unilateral, ensure the safety of the car travels in the side slope. References | Related Articles | Metrics

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Influence of Rim Lateral Stiffness on Interior Noise LIU Jiakai 2023, 48(6): 93-97.  DOI: 10.16638/j.cnki.1671-7988.2023.06.019 Abstract ( )   PDF (2040KB) ( )   In order to solve the problem that the whole vehicle emits noise in a certain frequency band, this paper accurately locates the contribution position of noise through road noise test, noise transfer function (NTF) test, tire modal test and tire stiffness test. The principle of NTF and the principle of modal analysis are described. The influence of rim lateral stiffness on vehicle interior noise is verified, and it is verified that the rim lateral height is proportional to the vehicle interior noise through experiments, and its contribution is especially obvious at 200～400 Hz. References | Related Articles | Metrics

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Weight Boundary Prediction of Commercial Vehicles Based on CAN Bus Data LU Xin 2023, 48(6): 98-101.  DOI: 10.16638/j.cnki.1671-7988.2023.06.020 Abstract ( )   PDF (1096KB) ( )   Based on the vehicle speed, engine speed and output power ratio collected by the controller area network (CAN) data system of commercial vehicles, combined with the efficiency of the vehicle transmission system and the windward area, this paper establishes a weight boundary prediction model of commercial vehicles to realize the real-time monitoring and prediction of the maximum load of running vehicles, which is convenient for the fine design of vehicle types in different sub markets. At the same time, a certain type of 4×2. The maximum mass of the express tractor is predicted and compared with the actual maximum mass of the vehicle. The results show that the maximum predicted mass of the vehicle is 37.9 t within the confidence interval of 97.73%, which is 6.5% different from the actual mass. The prediction result is accurate and has high practical value. References | Related Articles | Metrics

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Optimization and Improvement of Unqualified Defrosting Test of Air Conditioner of a Vehicle Based on CFD Analysis LI Wei 2023, 48(6): 102-107.  DOI: 10.16638/j.cnki.1671-7988.2023.06.021 Abstract ( )   PDF (3477KB) ( )   Defrosting performance is an important index in vehicle development and vehicle performance test. In the design and development stage, the defrosting analysis is mainly carried out by ANSA & Fluent software simulation analysis, and in the vehicle stage, the test is mainly carried out by environmental chamber. Aiming at the problem of unqualified defrosting of environmental chamber test vehicle, this paper applied ANSA & Fluent software to carry out computational fluid dynamics (CFD) simulation analysis. According to the analysis results, CATIA software was used to optimize and modify the air duct of the air conditioner, and CFD simulation analysis was carried out again for the modified data. After the analysis is qualified, the analysis results are verified by the vehicle environmental chamber test, thus forming a complete closed-loop process of analysisverification. In the process of air duct development, CFD simulation analysis by ANSA & Fluent software can effectively avoid defrosting problems in the later vehicle test stage, and avoid the waste of manpower, time and cost of problem rectification. References | Related Articles | Metrics

Testing and Experiment

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Study on Spray Characteristics Based on the Influence of Fuel Characteristics LI Hongzhi 2023, 48(6): 108-113.  DOI: 10.16638/j.cnki.1671-7988.2023.06.022 Abstract ( )   PDF (1912KB) ( )   In order to study the influence of fuel characteristics on spray characteristics, four kinds of diesel blended with different oxygenated fuels were tested under the conditions of 5 MPa ambient back pressure, 90 MPa injection pressure, 120 MPa injection pressure and 150 MPa injection pressure, the macrocosm and microcosm characteristics of four test fuels were studied by means of a spray visualization device. The results show that the spray tip penetration (STP) decreases with the decrease of kinetic viscosity, density and latent heat of vaporization, the average spray cone angle (ASA) increases slightly with the decrease of the kinetic viscosity and the latent heat of vaporization. Spray penetration distance and spray area increase with the increase of spray pressure, spray cone angle decreases slightly with the increase of spray pressure, SMD also decreases with the increase of spray pressure, the drop size distribution tends to be small with the increase of injection pressure. The comprehensive evaluation showed that the spray performance of diesel blended with 20% 2,5-dimethylfuran (DMF) at 150 MPa injection pressure was the best. References | Related Articles | Metrics

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Test of Vehicle Gateway Controller Based on CANoe Simulation XU Zhongguo 2023, 48(6): 114-117.  DOI: 10.16638/j.cnki.1671-7988.2023.06.023 Abstract ( )   PDF (1696KB) ( )   Vehicle gateway is at the core of internal communication local area network (LAN) of automobile control. High performance gateway controller plays an important role in the architecture of the vehicle control system. In this paper, according to the design requirements of a passenger vehicle electric power steering system controller, based on CANoe gateway system test of Vector company in Germany, the hardware architecture of the test platform is constructed, its working principle is analyzed, and the CANoe simulation environment is imported, the simulation model is established, and the test program is designed. Finally, the gateway controller is tested on the experimental bench to verify the feasibility of the design scheme, and the results show that the system achieves the desired effect. References | Related Articles | Metrics

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Performance Analysis of Commercial Buses Frontal Crash Safety Based on JT/T 1369—2020 QIN Zhenyuan 2023, 48(6): 118-122.  DOI: 10.16638/j.cnki.1671-7988.2023.06.024 Abstract ( )   PDF (1316KB) ( )   Based on the test method and technical requirements of JT/T 1369—2020 standard, analysis of its test and evaluation methods, and combined with the test data of 12 commercial buses frontal crash, the structural safety of the front part of the buses and the injury of the passengers inside the buses are studied and analyzed, the improvement measures for improving bus frontal crash safety are put forward, which can provide a useful reference for bus product safety design and development. References | Related Articles | Metrics

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Analysis of the Influence of Lateral Tire Stiffness on the Front Wheel Swing of Passenger Cars CHEN Jialei 2023, 48(6): 123-126.  DOI: 10.16638/j.cnki.1671-7988.2023.06.025 Abstract ( )   PDF (2556KB) ( )   The steering wheel of a type of pure electric medium-sized bus oscillates slightly and rapidly under high speed driving conditions on good roads, through the analysis of the formation mechanism of front wheel shimmy, seven factors that may cause front wheel shimmy are screened out, and the above factors are analyzed and confirmed one by one by using the elimination method,it is speculated that the difference in tire characteristic parameters may be the cause of front wheel shimmy. Further, by comparing and testing the Y-direction acceleration of the steering wheel when different brands of tires are installed on the faulty vehicle, it is confirmed that the cause of the front wheel shimmy of the vehicle is the problem of the tire's characteristic parameters. After comparing the uniformity parameters of the two types of tires, it is found that the lateral force fluctuation and lateral force offset of the tires matching the faulty vehicle are both large, and the lateral stiffness of the tires is relatively small, which leads to a large amplitude of front wheel shimmy and a small stable area of the front wheel shimmy system, which are the root causes of front wheel shimmy, and finally the problem of vehicle shimmy was effectively solved by replacing tires of other brands. References | Related Articles | Metrics

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Force Analysis of Steering System Oil Pipe for a Vehicle Model CHEN Yifeng 2023, 48(6): 127-131.  DOI: 10.16638/j.cnki.1671-7988.2023.06.026 Abstract ( )   PDF (1631KB) ( )   In order to improve the vehicle steering portability and driving safety, the hydraulic power assisted steering system is widely used in light trucks. The steering oil pipe is the main bearing and transmission component of hydraulic oil, and the failure of the steering oil pipe affects the steering performance of the vehicle. Combined with the actual case of steering oil leakage in a certain model in the market, from the analysis of failure mode performance, potential factor analysis to root cause confirmation, and finally proposed an optimization scheme to analyze the difference of the force model due to the layout and design of the vehicle in different driving conditions. Through the analysis of the system, the experience and ideas for steering system engineers are shared and provided. References | Related Articles | Metrics

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Prediction Method of Damping Loss Factor Based on Curved Surface Fitting CHEN Ying 2023, 48(6): 132-135.  DOI: 10.16638/j.cnki.1671-7988.2023.06.027 Abstract ( )   PDF (1508KB) ( )   In order to investigate the damping characteristics of damping materials at different temperatures and frequencies, the damping loss factor data of a vehicle hot melt damping material were obtained based on SAE J1637—2022 laboratory measurement of the composite vibration damping properties of materials on a supporting steel bar. The least square method was used to establish the fitting surface of damping loss factor to temperature and frequency, more damping loss factor data are obtained by this test method, and compared with the fitted surface data to verify the accuracy of the fitted surface.The research shows that this method can accurately predict the damping loss factor at different temperatures; for this damping material, its frequency-dependent characteristics are affected by temperature; besides temperature at peak damping loss factor is different at different frequencies. References | Related Articles | Metrics

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Road Longitudinal Slope Estimation Based on Adaptive Extended Kalman Filter Algorithm FU Kai 2023, 48(6): 136-139.  DOI: 10.16638/j.cnki.1671-7988.2023.06.028 Abstract ( )   PDF (1285KB) ( )   Vehicle in the long downhill section of the driving process, the road longitudinal slope of the vehicle longitudinal force analysis is particularly important, when the road slope over the conference will affect the driving safety of the vehicle, but the longitudinal slope of the road is difficult to obtain through the sensor direct measurement, real-time acquisition of the longitudinal slope of the road can provide a basis for optimizing the long downhill of the vehicle, this paper proposes based on the adaptive extension of the Kalman filter algorithm real-time estimation of the longitudinal slope of the road, and simulation experiments, the results show that this method has a strong accuracy and real-time. References | Related Articles | Metrics

Process and Equipment

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The Lift Gate Deformation by Strut Analysis Method Based on 3D Scanning Technique ZHAO Yun 2023, 48(6): 140-143.  DOI: 10.16638/j.cnki.1671-7988.2023.06.029 Abstract ( )   PDF (5691KB) ( )   According to the tendency of plastic lift gate application because of lightweight and complicated styling requirement, the lift gate deformation by strut and solution becomes more and more important for the rear end exterior fitting. This paper introduces the analysis case of plastic lift gate deformation in a sport utility vehicle (SUV) project. Through using 3D scanning and clouds technique to achieve analyzing the deformation more accurately, fast and perceptually in product early phase, to guide the deformation issue solution. References | Related Articles | Metrics

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Effect of Cleanliness on Automatic Transmission Performance and Detection and Control Methods YANG Haijun 2023, 48(6): 144-148.  DOI: 10.16638/j.cnki.1671-7988.2023.06.030 Abstract ( )   PDF (2745KB) ( )   The cleanliness directly affects the performance and service life of the automatic transmission (AT). If it is light, it causes the transmission to stall, and heavy, the transmission will be scrapped due to impurity blockage. Factors in the cleanliness of automatic transmission include unclean cleaning burrs, dust, packaging, assembly environment and other factors. How to systematically and comprehensively analyze the factors affecting the cleanliness, so as to scientifically formulate the basis for determining the cleanliness and adopt a reasonable cleanliness detection method, which is very important for controlling the cleanliness of the automatic transmission and improving the performance of the transmission. Therefore, this paper systematically analyzes the factors affecting cleanliness, control methods, solutions, the formulation of cleanliness standards, detection and analysis methods, detection process processes and equipment, which plays a key role in understanding the cleanliness problem and systematically solving the cleanliness problem. References | Related Articles | Metrics

Use and Maintenance

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Analysis on Abnormal Sound of Automobile Engine LU Yi 2023, 48(6): 149-152.  DOI: 10.16638/j.cnki.1671-7988.2023.06.031 Abstract ( )   PDF (2127KB) ( )   Abnormal sound of engine is one of the common engine faults, which will affect the comfort, power and safety of the vehicle. Common abnormal engine sound is "tutu""dang dang""da da"etc. In order to diagnose the fault cause and location of different noises more quickly and accurately, this paper analyzes the formation mechanism and logical relation of different noises one by one from the frequency、size and location. The rule of quick maintenance for different abnormal sounds is summarized. The steps and ideas of troubleshooting are illustrated by practical cases, which improves the timeliness and accuracy of the daily maintenance of abnormal engine noise troubleshooting. References | Related Articles | Metrics

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Structure and Overhaul of the Multiple Type Power Take-off HUANG Tianyuan 2023, 48(6): 153-158.  DOI: 10.16638/j.cnki.1671-7988.2023.06.032 Abstract ( )   PDF (1409KB) ( )   Power take-off are widely used in various special vehicles. Due to the variety of models, complex principles, and difficulty in fault diagnosis and maintenance, it is urgent to improve the skills of maintenance personnel. This paper adopts the method of schematic diagram and case analysis for common types of power take-offs, and elaborates its transmission structure and control principle in detail. Through comparative research, the common mechanical, pneumatic and electrical fault characteristics of power take-offs are obtained, guide maintenance personnel to clarify the structural principles of various types of power take-offs, master the ideas and methods of fault judgment, and provide reference for troubleshooting. References | Related Articles | Metrics

Automobile Education

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Construction of Remote Experimental Teaching System of Automotive Electronic Control Technology under the Background of New Engineering ZHAO Gengyun 2023, 48(6): 159-163.  DOI: 10.16638/j.cnki.1671-7988.2023.06.033 Abstract ( )   PDF (2180KB) ( )   In view of the shortcomings in the traditional experimental teaching of automobile electronic control technology courses, and in accordance with the requirements of the talent training objectives advocated by the "New Engineering", a remote experimental teaching platform for automobile electronic control technology has been built combining Alibaba Cloud, 4G mobile communication, automobile on-board diagnostics (OBD) and other technologies.The implementation process of distance experiment teaching under the platform is described. A three-level remote experiment project system from shallow to deep and from easy to difficult has been developed, and a remote experiment teaching mode of "three openness, three levels, three abilities, and one intersection" has been established, which makes the experiment teaching networked and remote, and breaks through the time and place restrictions.The remote experiment of automobile electronic control technology can effectively supplement the experimental teaching content and improve the experimental teaching effect. References | Related Articles | Metrics

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Teaching Reform and Practice of Power Battery Recycling and Utilization Course WEN Renxing 2023, 48(6): 164-170.  DOI: 10.16638/j.cnki.1671-7988.2023.06.034 Abstract ( )   PDF (1378KB) ( )   The new energy vehicle industry in China will soon usher in the peak period of power battery retirement after many years of development. At present, China is facing a shortage of power battery recycling and utilization industry enterprises and a lack of technical talent. Moreover the higher vocational colleges offer few courses on power battery recycling and utilization, and the teaching effect is not ideal. Guided by market demand and driven by typical work tasks, this paper could achieve good teaching effects by reconstructing the teaching content, clarifying teaching objectives, and formulating teaching strategies, which then could provide a reference for the reform of power battery recycling courses and talent training for other colleges and universities. References | Related Articles | Metrics

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Research on the Implementation of Post Based Teaching in Automobile Specialty under the Background of Integration of Production and Education LV Juping 2023, 48(6): 171-174.  DOI: 10.16638/j.cnki.1671-7988.2023.06.035 Abstract ( )   PDF (1173KB) ( )   In view of the increasingly serious gap between industry and education, and the difficulty in employment of graduates in higher vocational education, this paper aims at the integration of industry and education, takes 20 items of vocational education as the guiding ideology, and relies on the professional post requirements of local industry enterprises in the training of professional talents in automobile industry, carries out the sorting and reconstruction of teaching work, and implements the post-oriented teaching, which has achieved fruitful results. It has certain guiding significance for further research and exploration of industry-education integration. References | Related Articles | Metrics

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Teaching Reform and Exploration of Electric Vehicle Principle and Structure Course LI Xinci 2023, 48(6): 175-178.  DOI: 10.16638/j.cnki.1671-7988.2023.06.036 Abstract ( )   PDF (1167KB) ( )   In recent years, environmental problems have become more and more prominent. As an environmentally friendly vehicle, new energy vehicles have received more and more attention. Electric vehicles are one of the important types of new energy vehicles, and the number of them is increasing year by year. In this era, the course of electric vehicle principles and structure has gradually become an important course for vehicle engineering majors at this stage. In order to ensure the development of the course teaching with the times, teaching discussions and reforms are carried out and put into practice in terms of course objectives, teaching content, teaching methods, and assessment methods in the course. Through the teaching reform, the course teaching task can be efficiently completed, and it is hoped to provide experience and reference for the teaching development of electric vehicle courses in colleges and universities. References | Related Articles | Metrics

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Research and Practice on the Training Model of Students' Complex Engineering Problem Solving Ability Based on "Integration of Competition and Teaching" —Taking Vehicle Engineering Major as an Example ZHANG Chuanwei 2023, 48(6): 179-183.  DOI: 10.16638/j.cnki.1671-7988.2023.06.037 Abstract ( )   PDF (1198KB) ( )   Efforts to improve students' ability to solve complex engineering problems is the most core training goal in undergraduate teaching in our country since engineering education began professional certification. In this paper, the theory and method of "competition and education integration" curriculum system reform to cultivate students' complex engineering problem solving ability are given by putting forward the talent training teaching system of " competition and education integration". At the same time, the mode of " competition and education integration" teaching reform to cultivate students' complex engineering problem solving ability is practiced and explored. The results of major construction, talent training and discipline competition show that the practical ability and innovation and entrepreneurship ability of college students are significantly enhanced under the training mode of " integration of competition and teaching". References | Related Articles | Metrics

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Exploration of Curriculum System Reform in the Fusion Mode of Competition and Teaching Based on the 1+X Certificate System —Take New Energy Vehicle Technology as an Example CHEN Jing 2023, 48(6): 184-187.  DOI: 10.16638/j.cnki.1671-7988.2023.06.038 Abstract ( )   PDF (1331KB) ( )   Taking the new energy vehicle technology major as an example, this paper analyzes the standard of 1+X vocational skill level certificate, interprets the items and procedures of various skills competitions in vocational colleges, proposes the course setting ideas for the new energy vehicle technology major in vocational colleges applicable to the 1+X certificate system, and designs the course architecture diagram for the new energy vehicle technology major that can not only participate in the competition but also adapt to evidence collection. Each vocational college can build a modular curriculum system integrating "post course competition certificate" according to the professional situation. Finally, this paper proposes the implementation suggestions for the curriculum setting based on the 1+X certificate system in the mode of integration of foreign teaching, proposes the key points to solve the problem of connecting skill competition with regular teaching, provides strong support for vocational colleges to deepen the training of composite technical skills talents, accelerate the teaching reform of new energy vehicle technology, and optimize the talent training mode while integrating academic education and vocational education. It is will build a new class of teachers, promote the full development of vocational education, and ensure the improvement of the quality of professional personnel training. References | Related Articles | Metrics

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Reform of New Energy Vehicle Courses of Automotive Engineering Based on "Emerging Engineering Education" SUN Xiuxiu 2023, 48(6): 188-191.  DOI: 10.16638/j.cnki.1671-7988.2023.06.039 Abstract ( )   PDF (1135KB) ( )   Under the background of “double carbon”, new energy vehicles have developed rapidly. In the face of industry development and social demand shortage of new energy vehicles, it is necessary to improve the traditional professional training mode of vehicle engineering. Combined with the concept of "new engineering" professional certification and the construction scheme of vehicle engineering talent system, the course objectives of new energy vehicles in vehicle engineering are improved from the perspective of continuous improvement. Optimize the construction of curriculum system and promote the new energy vehicle training program for vehicle engineering major. Optimize the traditional teaching mode, establish a multi-directional assessment system, cultivate vehicle engineering professionals to meet the social needs of the new era. References | Related Articles | Metrics

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A Brief Analysis of the Impact of China's Logistics Development on Road Trucks LI Yugang 2023, 48(6): 192-196.  DOI: 10.16638/j.cnki.1671-7988.2023.06.040 Abstract ( )   PDF (1330KB) ( )   Railways, waterways, highways, and aviation are the four most conventional modes of cargo transportation. There are competitions and complements among each mode in the entire social logistics process. With the improvement of China's economic scale and the upgrading of high-quality development model, the logistics industry is reflecting new development characteristics. The gradual development of multimodal transport will affect the development of different transport modes. This paper summarizes the development status of China's logistics industry, transportation infrastructure and freight equipment. From the perspective of cost, efficiency, flexibility and dependence on infrastructure, the characteristics of the four modes of transportation are compared and analyzed. Considering the relevant policies issued by China in recent years to guide industrial transformation and upgrading, it was identified that the current logistics structure of China, in which road freight is the absolute main force, is gradually changing during the process of industrial efficiency promotion. Also, based on the demand for truck products in the development of multimodal transport, the potential impact on road trucks is analyzed. References | Related Articles | Metrics

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Application Status and Prospect of Hydrogen Energy in Heavy Truck Powertrain Assembly SHI Yumei 2023, 48(6): 197-202.  DOI: 10.16638/j.cnki.1671-7988.2023.06.041 Abstract ( )   PDF (1064KB) ( )   With the sales of heavy trucks increasing year by year, the demand for low-carbon energy saving and emission reduction is higher and higher, while hydrogen energy is a low-carbon and environment-friendly fuel, which is widely used in heavy truck power assembly. At present, hydrogen energy in heavy truck powertrain application mainly hydrogen internal combustion engine, hydrogen combustion engine and hydrogen fuel cell three ways. In this paper, the research and development status of hydrogen energy in heavy truck powertrain are analyzed, and the advantages, disadvantages and development strategy of three powertrain modes are analyzed. The research shows that, based on the national policy of supporting the development of hydrogen energy, the application of hydrogen energy in heavy truck powertrain will be developed, and the development and validation of hydrogen internal combustion engine should be accelerated, reduce operating costs and other issues. By comparison, it is found that the hydrogen engine can be considered as a transition product for the application of hydrogen energy in the heavy truck powertrain and the hydrogen fuel cell will be an ideal heavy truck powertrain. References | Related Articles | Metrics