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10 April 2024, Volume 49 Issue 7 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
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New Energy Vehicle

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Analysis of the Driving Mileage of Solar Energy Extended-range Power Generation System PAN Tao 2024, 49(7): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2024.007.001 Abstract ( )   PDF (1361KB) ( )   In order to cope with environmental pollution and other factors, the national level has gradually advocated and supported the development of new energy vehicles. At present, the problem of the driving mileage insufficient of battery electric vehicles is still hindering the development of new energy vehicles. In order to solve this problem, this paper carries out a research on the power supply of battery electric vehicles by solar extended-range power generation system. Four A-grade monocrystalline silicon panels are mounted on the roof of the vehicle to absorb the energy emitted by the sun, and the controller and power analyzer are used to record the power converted by the panels and the power energy that is actually charged to the battery. The controller and power analyzer are used to record the data of the electric energy converted by the power generation panel and the electric energy actually charged for the battery, and the theoretical calculation and experimental power generation are compared and analyzed. Through two sets of experiments, the fixed bench test and the mobile vehicle test, the actual converted electrical energy and the mileage can be tested. The experimental results show that the power generation of the solar cell in one day has a certain power loss from the actual power charged into the power battery pack, but it can still increase the driving mileage 20～30 km for the vehicle. References | Related Articles | Metrics

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PHEV Energy Management Strategy Based on Dynamic Programming and RBF Neural Network WEI Liqing 2024, 49(7): 7-13.  DOI: 10.16638/j.cnki.1671-7988.2024.007.002 Abstract ( )   PDF (938KB) ( )   To improve the fuel economy of plug-in hybrid electric vehicles, an energy management strategy for plug-in hybrid electric vehicles based on dynamic programming and radial basis function (RBF) neural network is designed. First, a mathematical model of a plug-in hybrid vehicle is established. Secondly, with the minimum engine fuel consumption as the objective function, dynamic programming is used to solve the global optimal offline optimization results. Finally, RBF neural network is used to learn the offline optimal control results, and a nonlinear mapping relationship between engine output torque and vehicle state parameters is established, and an energy management strategy based on dynamic programming and RBF neural network is obtained. The simulation results show that the fuel consumption of the energy management strategy proposed in this article is reduced by 2.92% compared with the power consumption-power maintenance strategy, which verifies the effectiveness of the strategy. References | Related Articles | Metrics

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Research Status and Prospects of Electric Vehicle Thermal Management ZHAI Ruodai 2024, 49(7): 14-19.  DOI: 10.16638/j.cnki.1671-7988.2024.007.003 Abstract ( )   PDF (876KB) ( )   The rapid development of electric vehicles is accompanied by challenges such as battery performance and safety issues under high and low temperature conditions, which necessitate the improved use of thermal management technologies. This article summarizes the recent advancements in electric vehicles thermal management, highlighting the evolution from independent battery cooling/heating systems and cabin air conditioning systems to highly integrated thermal management systems. Through a thorough analysis of representative electric vehicles thermal management systems, it unveils the holistic process by which integrated thermal management systems coordinate the regulation of heat for critical components including batteries, motors, power electronics, and air conditioning systems. This study provides valuable insights into future research and development directions in this domain. References | Related Articles | Metrics

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Scenario Based Development and Study of Efficient Electric Drive Matching CHEN Wen 2024, 49(7): 20-23.  DOI: 10.16638/j.cnki.1671-7988.2024.007.004 Abstract ( )   PDF (727KB) ( )   The penetration rate of new energy continues to grow, but "range anxiety" is still one of the important factors restricting consumers to buy new energy vehicles. Compared with the unity of the announced working conditions, the actual vehicle use scenario is more complex, and the models with different positioning have obvious vehicle use scenario distribution. This paper is based on the vehicle use scenario distribution of big data statistics. Compare the relationship between different matching schemes of electric drive systems and the actual road achievement rate, it is found that the speed ratio adjustment or the design of high efficiency zone distribution of electric drive can improve the endurance achievement rate in vehicle scenarios while ensuring that the announced working conditions are not affected. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Design of Steering Wheel Storage and Hiding System Function for Intelligent Cabin GAO Jiabing 2024, 49(7): 24-28.  DOI: 10.16638/j.cnki.1671-7988.2024.007.005 Abstract ( )   PDF (1353KB) ( )   With the development of automotive intelligent technology, there is an increasing demand for intelligent driving and riding experiences, and intelligent cabins and chassis are key assemblies to achieve this demand. The welcome function of the steering wheel is the core function that reflects comfort and experience in the intelligent cabin. At the same time, in the future, high-level intelligent driving vehicles should also have a storage and hidden function in the steering wheel after achieving fully autonomous driving, in order to further expand good driving comfort and experience. This article studies an intelligent cabin steering wheel storage and concealment system that has both traditional steering wheel welcome function and storage and concealment function. By studying the composition, working principle, control logic, and other aspects of the steering wheel storage and concealment system, the functional design of the steering wheel storage and concealment system is carried out, including electric adjustment function, welcome function, steering wheel flipping function, long-distance storage function of electric control column, expandable function, etc. It meets the new technical requirements for storing and hiding the road feel simulation device of intelligent steer-by-wire system. References | Related Articles | Metrics

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A Solution to ESP/VDC Function Spurious Triggering in Light Truck YU Jinxia 2024, 49(7): 29-35.  DOI: 10.16638/j.cnki.1671-7988.2024.007.006 Abstract ( )   PDF (2464KB) ( )   For light trucks equipped with electronic stability program (ESP), the built-in acceleration and roll angle sensors are easily stimulated by vehicle vibrational excitation, resulting in an amplification effect that causes the ESP/vehicle dynamic control (VDC) function to be triggered incorrectly. This paper describes two schemes of hardware brake pipe design optimization and software algorithm optimization for VDC error triggering. After theoretical and real vehicle verification, it is very effective to prevent the VDC function from triggering by mistake. The scheme is innovative and has certain engineering application value. References | Related Articles | Metrics

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Application and Development of New Brake-by-wire Technologies for Intelligent Electric Vehicle ZHAO Huyi 2024, 49(7): 36-44.  DOI: 10.16638/j.cnki.1671-7988.2024.007.007 Abstract ( )   PDF (1537KB) ( )   With the development of brake control technology, the electronic control of the brake system has become a key technology roadmap in this field. The brake-by-wire system can achieve more functions through the new electrical and electronic architecture established by intelligent electric vehicle. The brake-by-wire system is the technical core of intelligent electric vehicle x-by-wire chassis, and a new research focus in the vehicle industry. This paper outlines the development of vehicle brake system. The structural characteristic, working principle, and system performance of two typical brake-by-wire systems are analysed. Combined with the technical requirements of intelligent electric vehicle on brake-by-wire system, the characteristic and application of the new brake-by-wire system technologies are introduced. Finally, the technical research trends of the brake-by-wire system is prospected, and the reference for the development directions of future brake-by-wire system is provided. References | Related Articles | Metrics

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Research on Path Tracking Ttrategy Based on Vertical and Horizontal Cooperative Control LI Yongheng 2024, 49(7): 45-53.  DOI: 10.16638/j.cnki.1671-7988.2024.007.008 Abstract ( )   PDF (1603KB) ( )   In order to improve the path tracking accuracy and driving stability of intelligent vehicle, a tracking strategy considering the vertical and horizontal direction coordination is proposed for intelligent vehicle path tracking control. From the perspective of the vehicle system as a whole, vertical motion and horizontal motion are decoupted, and a hierarchical control structure is adopted. The upper controller decoups the vehicle kinematic coupling through the adaptive sliding mode variable structure control based on radial basis function (RBF) neural network, and uses the RBF neural network to track the system disturbance caused by the model uncertainty in real time;The lower controller is the optimal tire force distributor based on the vertical and horizontal cooperative control, and takes the tire adhesion coefficient as the optimization objective. The tire force is confined within the attachment ellipse, and the vertical and horizontal tire force is optimized for distribution, so as to improve the accuracy and stability of vehicle path tracking in extreme working conditions. References | Related Articles | Metrics

Design and Research

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Lightweight Design of an SUV Body in White Based on Isight BIAN Xiang 2024, 49(7): 54-58.  DOI: 10.16638/j.cnki.1671-7988.2024.007.009 Abstract ( )   PDF (2248KB) ( )   The body lightweight design is of great significance to the energy saving and emission reduction of vehicles. In order to reduce the weight of a certain sport utility vehicle (SUV) model in the late stage of development, the agent model technology is applied to build the body in white optimization process. Firstly, the finite element model of SUV body in white is established, and the torsional stiffness performance is simulated and analyzed as the constraint condition of optimization design. Through two sensitivity analyses, 66 key components and 38 design variables are screened. Based on Isight optimization platform, the design of experiments is carried out and a angent model aiming at the body mass is constructed. The HYBRID algorithm is used to optimize the thickness of key components. After optimization, the torsional stiffness of the body in white is basically unchanged, and the body mass is reduced. This optimization process has a good effect on body in white weight reduction in the late stage of vehicle development. References | Related Articles | Metrics

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Prediction Method for Engine Compartment Cover Flutter Based on Air Pressure Load LAI Guangsheng 2024, 49(7): 59-63.  DOI: 10.16638/j.cnki.1671-7988.2024.007.010 Abstract ( )   PDF (1628KB) ( )   As the main component that absorbs the collision energy of the vehicle, the deformation and flutter problem of the engine compartment cover under high-speed road driving conditions are important factors affecting the vehicle safety. Based on the requirement of flutter performance of the engine compartment cover, this paper proposes a prediction method for the flutter deformation of the engine compartment cover under high-speed driving conditions. Through finite element simulation calculation, considering the quasi-static loading under gravity, elastic force loading under the action of buffer pad and spring, and multi-dimensional loading condition of air pressure load under high-speed driving conditions, the method definition, model establishment, performance analysis and test check are completed, and the influence of multi-dimensional loading on engine compartment cover flutter is studied, which verifies the feasibility and effectiveness of the development and application of the prediction method. References | Related Articles | Metrics

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Design and Analysis of Brake Pedal Assembly for Formula Student Electric China SHAO Jun 2024, 49(7): 64-67.  DOI: 10.16638/j.cnki.1671-7988.2024.007.011 Abstract ( )   PDF (1511KB) ( )   In recent years, with the continuous change and progress of the university teams, the performance of the race is also gradually rising in the formula student electric China (FSEC). While pursuing the ultimate speed, the safety performance of the racing car has also become a problem that cannot be ignored. Therefore, the design of the braking system of the racing car is very important. The control of the whole braking system is completed by the driver stepping on the brake pedal, so this paper mainly designs and analyzes the brake pedal assembly in the braking system. Under the premise of meeting the requirements of the competition rules and the required speed performance improvement and lightweight design concept, the brake pedal assembly is designed and modeled according to the vehicle parameters of the school team's E39 racing car in the 2022 season, and the Workbench is used for simulation analysis and verification. References | Related Articles | Metrics

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A Powertrain Domain Integration Technology with High Energy Saving Vehicle Control Unit SUN Fengtao 2024, 49(7): 68-74.  DOI: 10.16638/j.cnki.1671-7988.2024.007.012 Abstract ( )   PDF (1980KB) ( )   Under the trend of "low carbonization, information and intelligence" in automobile industry, in order to meet the higher green, energy saving and efficient development requirements of new energy vehicles, this paper discusses in detail about a powertrain domain integration technology with high energy saving vehicle control unit. Firstly, proposes a high energy saving drive torque distribution method and an optimal braking energy feedback model and strategy, which can reduce vehicle energy consumption and improve driving range to a certain extent. Secondly, brings up a powertrain domain integration technology design, which integrates the control functions of battery management control unit, vehicle control unit, motor control unit and high voltage distribution control unit, simplifies the electronic system architecture, and makes the overall powertrain system more efficient. References | Related Articles | Metrics

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Theoretical Analysis of the Probability of Liquid Accumulation by Electrophoresis in Hinge Holes of a Front Cover QI Bingbing 2024, 49(7): 75-78.  DOI: 10.16638/j.cnki.1671-7988.2024.007.013 Abstract ( )   PDF (1369KB) ( )   Combines the electrophoretic liquid accumulation defect in the hinge hole of a certain car's front cover that occurred during the actual production and manufacturing process. In the process of solving this problem, the author transformed the actual on-site problem into a mathematical model, and used Python language programming and computer-aided solution to quickly obtain the theoretical probability of the problem occurring. The introduction of this article is a typical case of using digital thinking to solve engineering problems. It has certain reference significance for engineering personnel to analyze and solve problems, and has good reference value for promoting the use of digital thinking by all members of the manufacturing industry. References | Related Articles | Metrics

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Design of TCU Configuration Tool Based on Python and Kvaser Leaf HOU Lianjun 2024, 49(7): 79-84.  DOI: 10.16638/j.cnki.1671-7988.2024.007.014 Abstract ( )   PDF (1373KB) ( )   In order to simplify the configuration process of the transmission control unit (TCU) and provide a flexible way to manage and modify TCU parameters. This paper presents a heavy-duty hydraulic automatic TCU configuration tool based on Python and Kvaser Leaf. By using Python programming language and Kvaser Leaf interface, TCU can be directly controlled and configured through controller area network (CAN) calibration protocol (CCP). The tool configues user-friendly profiles so that users can easily browse and modify TCU parameters. The experimental results show that the tool has high efficiency and reliability in configuring TCU, can greatly improve the efficiency of configuration work, and is easy to expand and low cost. References | Related Articles | Metrics

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Parameters Design and Simulation of Pedal Parking Brake Mechanism YANG Wenzhi 2024, 49(7): 85-90.  DOI: 10.16638/j.cnki.1671-7988.2024.007.015 Abstract ( )   PDF (1744KB) ( )   In response to the problem of a pedal parking brake mechanism not being able to effectively maintain and release the parking torque, this paper starts from the function, working principle, and structural characteristics of the pedal parking brake, and conducts mechanical analysis and geometric parameter design calculation for key components such as the ratchet and pawl. A dynamic analysis model of the parking brake mechanism is constructed based on ADAMS simulation analysis software, and the influence of the selection of key component parameters of the tension spring on the braking performance and effect of the brake mechanism is analyzed. The braking and release process of the pedal parking brake mechanism is simulated. Through kinematic simulation analysis of the mechanism under optimized parameters, the motion trajectories of the ratchet and pawl marking points are obtained, and the reliability analysis of the braking mechanism performance is conducted within 10 cycles. The conclusion verifies that the designed parameters meet the parking brake performance and the requirements for maintaining and releasing the parking torque. References | Related Articles | Metrics

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Design of Hydraulic Control System of Road Side Step Milling Machine TIAN Jiao 2024, 49(7): 91-95.  DOI: 10.16638/j.cnki.1671-7988.2024.007.016 Abstract ( )   PDF (994KB) ( )   In the traditional road step milling process, the milling machine needs to handle the pavement first, which is time-consuming and labor consuming, and the efficiency is low and the cost is high. Aiming at this problem, this paper introduces a special step milling equipment-road side step milling machine, which is used in the process of highway reconstruction and expansion project. Mainly from the road side step milling machine structural characteristics, hydraulic control system technical scheme, cooling water system design, important components model selection and so on. The machine design structure is simple and lightweight, hydraulic control system is driven by a hydraulic pump milling drum at the same time for rotary movement and up and down reciprocating movement, fast, simple structure, good cutting performance, energy saving, cooling water from the gearbox to get power to drive the sprinkler work, the water inside the tank through the pipe and sprinkler spray out. Finally, according to the working condition, the model of hydraulic pump,hydraulic motor and hydraulic cylinder of actuator is selected. The excellent performance of road side step milling machine provides a strong guarantee for highway construction progress and milling quality. References | Related Articles | Metrics

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Research on Temperature Demodulation and Collection of Automotive Power Battery Based on OTDR FENG Ziliang 2024, 49(7): 96-100.  DOI: 10.16638/j.cnki.1671-7988.2024.007.017 Abstract ( )   PDF (1382KB) ( )   Strengthening the research and development of power battery safety management technology has become an important topic in the development of the new energy vehicle industry. This article adopts the temperature measurement principle based on optical time-domain reflectometer (OTDR) technology to conduct distributed collection of individual batteries in battery packs. Comparing the single channel demodulation method with the dual channel demodulation method, it is found that the dual channel demodulation method is more suitable for demodulating the temperature of power batteries. A temperature acquisition system consisting of wavelength division multiplexing module, amplifier module, analog-to-digital conversion module, temperature display and alarm system is built to collect weak Stokes and anti Stokes light. The circuit diagram of the temperature measurement system is built in Proteus8.9 software and simulated for testing.The temperature display and abnormal alarm functions of the system are verified using a rheostat simulation signal source. References | Related Articles | Metrics

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Research on the Sky-hook Damping Control Strategy of the Semi-active Suspension in the Cab SHI Jinhua 2024, 49(7): 101-106.  DOI: 10.16638/j.cnki.1671-7988.2024.007.018 Abstract ( )   PDF (1222KB) ( )   In order to verify the effectiveness of the sky-hook damping control strategy in controlling the semi-active suspension system of commercial vehicle cab, TruckSim is used to establish a vehicle model, and Simulink is used to establish a controller model and actuator model. The weighted sum of the root mean square values of vibration acceleration in all directions of cab is used as the evaluation function. By using TruckSim and Simulink co-simulation, the parameter optimization of the controller is completed under the 50 km/h automobile speed and random input road model. By comparing the evaluation function values of semi-active mounts based on sky-hook damping control or improved smooth sky-hook control and passive suspension at the same speed, it can be seen that compared to passive suspension, the semi-active suspension system of commercial vehicle cabs using sky-hook damping control strategy can significantly improve the riding comfort of the cab, resulting in a 11.39% improvement in vehicle vibration. References | Related Articles | Metrics

Testing and Experiment

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Experimental Platform Development of Differential Lock Control Algorithm for off-road Vehicles Based on Model YANG Haodong 2024, 49(7): 107-112.  DOI: 10.16638/j.cnki.1671-7988.2024.007.019 Abstract ( )   PDF (4612KB) ( )   In order to solve the problems of high cost, low efficiency and difficult data acquisition of the existing differential lock automatic control algorithm experimental platform,the research group has developed a test platform for the automatic control algorithm of differential lock based on the model off-road vehicle, which collects vehicle status information by arranging sensors on a 1:8 model simulation off-road vehicle to collect vehicle status information and transmits it to the controller for calculation and processing, and observes the vehicle status information in real time through bluetooth, providing technical support for verifying the automatic control algorithm of differential lock. This paper mainly introduces the design scheme, structural composition, sensor installation position and automatic locking and unlocking conditions of simulated vehicle nest differential lock, and verifies the effectiveness and reliability of the experimental platform. The development of this experimental platform provides experimental conditions for the subsequent transplantation of differential lock automatic control algorithm and provides an experimental basis for verifying the reliability of differential lock control algorithm. References | Related Articles | Metrics

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Characteristic Analysis of Hydraulic Spring Type Quasi-zero Stiffness Vibration Isolation System GENG Disheng 2024, 49(7): 113-119.  DOI: 10.16638/j.cnki.1671-7988.2024.007.020 Abstract ( )   PDF (1246KB) ( )   For low-frequency vibration isolation of vehicle precision instruments, a new quasizero-stiffness vibration isolation system is constructed by using two hydraulic springs as negative stiffness components in parallel with vertical springs. Through the static analysis of the system, the parameter conditions for realizing the quasi-zero stiffness characteristics are obtained. The amplitude-frequency response of the system under harmonic excitation is solved using the average method. The stability of the system is analyzed using the Mathieu equation. The effects of linear stiffness parameters and nonlinear stiffness parameters on force transmissibility are also analyzed. The results show that the initial vibration isolation frequency of the quasi-zero stiffness system is reduced by about 54% compared with that of the linear system. The research makes the vehicle precision instrument not easily damaged under low frequency or even ultra-low frequency conditions, and has a wide application prospect. References | Related Articles | Metrics

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Influence of Tires on the Driving Range and Energy Consumption of Light Pure Electric Vehicles YANG Ying 2024, 49(7): 120-124.  DOI: 10.16638/j.cnki.1671-7988.2024.007.021 Abstract ( )   PDF (1555KB) ( )   The article selectes two types of tires and assembled them on a light pure electric vehicle respectively, then conducts road resistance tests and range and energy consumption bench tests to investigate the influence of tires on the range and energy consumption of light pure electric vehicles. The test results of road resistance testing show that there is a significant difference in road resistance between the two types of tires, with the highest difference at low speed points. After conducting range and energy consumption tests on a chassis dynamometer for China light vehicle test cycle (CLTC), the results show that, with the same other vehicle parameters, selecting A brand 245/50ZR18 tires resultes in a 2.8% lower energy consumption, 3.6% higher range, and 3.0% lower energy consumption from external power sources compared to selecting B brand 245/45R19 tires. The difference in tires simultaneously affects the road resistance, power system efficiency, and kinetic energy recovery effect of the entire vehicle, resulting in differences in driving range. Therefore, reasonable tire selection plays a certain role in improving driving range, and targeted testing and optimization are needed during the development and validation stage of the prototype. This study can also provide certain engineering case support for determining whether the whole vehicle has the same declared driving range under different tire configurations when conducting type approval of the Ministry of Industry and Information Technology's announcement catalog for light pure electric vehicles. References | Related Articles | Metrics

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Detection and Modification Prediction of Motor Roughness Based on Roughness and Modulation Analysis MAO Yang 2024, 49(7): 125-129.  DOI: 10.16638/j.cnki.1671-7988.2024.007.022 Abstract ( )   PDF (3046KB) ( )   Targeted at the issue of roughness in the auditory perception during motor acceleration, firstly a roughness algorithm based on Sottek auditory model is introduced from the objective calculation of psychoacoustic parameters to realize the mapping between the calculation index of psychoacoustic parameters and the subjective perception of human ear roughness. Furthermore, the modulation frequency and order which cause roughness perception of motor is careful investigated through specific roughness analysis, modulation spectrum analysis and Fourier spectrum analysis. Finally, through virtual modification and playback technology of sound, the potential problem order of the motor is virtual modified and playback, and the improvement effect is visually evaluated before the real improvement of the potential scheme, thus shortening the improvement cycle and reducing the improvement risk. References | Related Articles | Metrics

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Testing and Matching Optimization Analysis of Thermal Balance for Commercial Vehicle YE Gang 2024, 49(7): 130-134.  DOI: 10.16638/j.cnki.1671-7988.2024.007.023 Abstract ( )   PDF (1657KB) ( )   Taking a light commercial vehicle as an example, the road test method of motor vehicles thermal balance is studied. In order to measure and analyze the thermal balance of commercial vehicles, this paper proposes a road test scheme (load trailer) test of vehicle thermal balance, which fully verifies the effectiveness and feasibility of the scheme through the test and application of a vehicle. On this basis, two optimization schemes to solve the motor vehicles thermal balance problem of vehicle engines are proposed to verify the feasibility of the optimization scheme and achieve good results. References | Related Articles | Metrics

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Test Evaluation of Feasibility of First Maintenance Mileage Extension WANG Zhaoyuan 2024, 49(7): 135-138.  DOI: 10.16638/j.cnki.1671-7988.2024.007.024 Abstract ( )   PDF (1313KB) ( )   The first maintenance mileage of the engine,is related to the reliability and the performance in the life cycle. Should be integrated engine technical characteristics, use environment and oil quality, through the bench evaluation test, combined with the vehicle road test, according to the performance of the engine and oil, reasonable setting. According to the needs of users in an international market to extend the first maintenance mileage, this paper designs a series of evaluation tests to confirm the feasibility of extending the first maintenance mileage, taking into account the operating environment and aging factors of the engine and oil, as well as the characteristics of regional operating conditions. References | Related Articles | Metrics

Process·Materials

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Study on the Aging Performance of PP+EPDM-TD20 and TPV under Xenon Lamp Test Simulating Moist and Hot Climate MIN Quanzhao 2024, 49(7): 139-142.  DOI: 10.16638/j.cnki.1671-7988.2024.007.025 Abstract ( )   PDF (1574KB) ( )   PP+EPDM-TD20 and thermoplastic vulcanizate (TPV) are widely used in the manufacturing of automotive exterior trims, and the performance degradation of polymer materials is more severe in moist and hot climate. Changing trends of the appearance and mechanical properties of PP+EPDM-TD20 and TPV are studied under xenon lamp test simulating moist and hot climate in this paper. The experimental results indicate that the gray scale, color difference and hardness of the two polymer materials basically remains unchanged, the gloss retention rate, tensile strength retention rate and breaking elongation show an approximate exponential downward trend, the flexural modulus of PP+EPDM-TD20 show an approximate exponential upward trend, while TPV shows an approximate exponential downward trend under 1 600 h xenon lamp irradiation. The fitted aging equation can provide important reference value for subsequent quantitative research on the performance degradation of automotive exterior trims. References | Related Articles | Metrics

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An Improvement Method for the Oil Leakage Problem of the Spindle of the Grinder ZHAO Chunqiang 2024, 49(7): 143-146.  DOI: 10.16638/j.cnki.1671-7988.2024.007.026 Abstract ( )   PDF (1146KB) ( )   Semi-automatic cylindrical grinder MB1632 spindle shaft diameter due to long-term use, resulting in its wear and leakage, this problem has seriously affected the company's normal production order. This paper mainly introduces a method to improve the wear oil leakage of the spindle shaft diameter of the semi-automatic cylindrical grinder MB1632. The root cause of the wear oil leakage of the spindle shaft diameter of the grinder is analyzed. The oil seal end cover is optimized and improved synchronously to realize the contact between the oil seal and the spacer sleeve. The end cover, the oil seal and the spacer sleeve can be removed quickly. It not only improves the maintenance efficiency of the spindle shaft diameter wear oil leakage problem, reduces the maintenance cost, but also improves the operation probability of the machine tool. References | Related Articles | Metrics

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Research and Solution of Composite Quality Issues of Rear End of Body-in-White WEI Ling 2024, 49(7): 147-151.  DOI: 10.16638/j.cnki.1671-7988.2024.007.027 Abstract ( )   PDF (1723KB) ( )   This paper takes the rear end quality as the research object, in order to solve the gap and transition issues in the trunk lid assembly, taillight assembly and rear bumper assembly, so that the one-time delivery pass rate in assembly shop can be increased. To solve the rear end quality issues in assembly shop systematically, counter measures like optimizing the dimension of the body-in-white, controlling the dimension of the incoming parts and adjusting the assembly process. Propose the concept of "manufacturing tolerance" for assembly and welding, and develop more than 30 dimensional control tolerances suitable for the final assembly requirements of the body-in-white. A standard gun change process has been formulated, in order to minimize the dimension fluctuation of the rear bumper bracket-welding nail caused by the gun change, and control the fluctuation from issue source. A closed-loop control of dimension fluctuation is formed, including issue detection, dimensional optimization and verification of final assembly status. Through all these measures, the final rework time can be reduced by 2 000 h per year, and the one-time delivery pass rate of final can be increased by 15.4% in assembly-shop. References | Related Articles | Metrics

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Automatic Rolling Technology of Sealing Strip Based on Visual Guidance and Flexible Fixture DENG Qun 2024, 49(7): 152-156.  DOI: 10.16638/j.cnki.1671-7988.2024.007.028 Abstract ( )   PDF (2945KB) ( )   The vehicle body door sealing strip is a key component that ensures the waterproofing and quietness in the interior of the vehicle, and its assembly quality is closely related to the overall sealing performance and noise, vibration, harshness (NVH) performance of the vehicle. The current mainstream vehicle models all use clamp type sealing strips. During the assembly process, production workers initially clamp the sealing strips onto the door frame sheet metal, and then use electric or pneumatic rolling tools to clamp the metal sheets in the sealing strips to ensure a tight fit between the sealing strips and the sheet metal. This article designs and implements a set of automatic rolling equipment for sealing strips, which replaces manual rolling of door sealing strips. By adopting this set of equipment for mass production in the vehicle production factory, the efficiency of the door sealing strip rolling process has been improved, saving 80 s for each vehicle. At the same time, it further improves the stability of the rolling process and reduces the occurrence of quality defects. References | Related Articles | Metrics

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A Brief Discussion on the Method of Eliminating the Defects of Electrode Rubbing in Robot Shaped Welding Pliers DING Yongjie 2024, 49(7): 157-161.  DOI: 10.16638/j.cnki.1671-7988.2024.007.029 Abstract ( )   PDF (2164KB) ( )   Robot welding pliers are an important equipment for automated cab welding lines, mainly composed of welding transformers, clamp arms, cylinders, grip rods, electrodes, etc. The structure of the welding pliers is usually designed based on the numerical simulation of the driver's cab body and the welding fixture of the body welding line. In this article, the robot welding pliers encountered special structures in the cab body according to product development requirements. Although the designed robot welding pliers can complete the established welding work, there may be situations where the quality of the welding points does not meet the welding quality standards during operation. Based on this issue, the article analyzes the structural characteristics of robot welding pliers and designs a welding tongs structure that can combine linear guide sliders with welding pliers to enhance the stability of welding pliers, improve the appearance quality and welding strength of welding joints in the cab, and provide necessary guarantees for enterprise product quality control. References | Related Articles | Metrics

Automobile Education

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Integration Mechanism and Interactive Effects of Teaching-Ideology and Politics in the Automotive Structure Curriculum OUYANG Hongwu 2024, 49(7): 162-167.  DOI: 10.16638/j.cnki.1671-7988.2024.007.030 Abstract ( )   PDF (1196KB) ( )   To cultivate high-quality and innovative professional talents in automobile engineering, this paper reviews exploration on the close integration between the teaching of Automotive Structure and China's automotive industry development in recent years. Successful cases of curve overtaking by domestic automobile brands are continuously accumulated and refined. Inspiration from the automotive industry's shift to new energy vehicles through the organic integration of energy and automobiles is drawn. The interaction between the curriculum, ideology and politics education to promote an organic fusion of the two is explored. The primary focus is on enhancing students' technical innovation capabilities and promoting an innovative spirit. The goal is to cultivate highquality professionals who have a profound understanding and passion for automobiles and the automotive industry, thereby infusing vitality and cohesion into the teaching process of curriculum, ideology and politics education. As a result, a high-quality talent cultivation model, that the curriculum-ideology and politics (external loop) reinforces the integration of "knowledge-abilityvalue" (internal loop) in the Automotive Structure curriculum's ideology and politics education, is established. References | Related Articles | Metrics

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The Application of Generative Artificial Intelligence in the Teaching of Automobile Theory in Professional Courses XU Sha 2024, 49(7): 168-171.  DOI: 10.16638/j.cnki.1671-7988.2024.007.031 Abstract ( )   PDF (1152KB) ( )   Generative artificial intelligence technology has had a profound impact on higher education. This article takes the compulsory course Automobile Theory in Vehicle Engineering as an example to explore the application of domestic generative artificial intelligence tool iFlytek Spark in course teaching. By utilizing the iFlytek Spark platform, teachers can more quickly carry out teaching ideas, design, plan writing, homework assignments, etc., improving the efficiency and quality of professional course teaching. Generative artificial intelligence tools can also provide innovative teaching methods or perspectives, promoting teachers to innovate classroom teaching based on their own courses. The exploration of iFlytek Spark in professional course teaching in this article can provide a certain reference for the teaching reform of professional courses in the era of generative artificial intelligence. References | Related Articles | Metrics

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Research on the Reform of Practical Teaching of New Energy Vehicles in Vocational Colleges WANG Hongran 2024, 49(7): 172-176.  DOI: 10.16638/j.cnki.1671-7988.2024.007.032 Abstract ( )   PDF (1191KB) ( )   By analyzing the current situation of practical teaching in the field of new energy vehicles and addressing the existing problems in practical teaching, combined with the practical experience of the 1+X certificate of intelligent new energy vehicles, a three-level and three-stage blended practical teaching system combining virtual and real is constructed. The reform and exploration of practical teaching are carried out from the aspects of practical course system, practical teaching content, practical teaching platform, and practical teaching organization. The practical course system is divided into three levels, building practical teaching content based on 1+X certificates, constructing practical teaching platforms based on practical teaching needs. The practical teaching organization adopts group teaching, mixed online and offline, and divides the teaching process into three stages: before class, during class, and after class, improving the quality and level of talent cultivation, and providing reference and guidance for practical teaching of new energy vehicles in vocational colleges. References | Related Articles | Metrics

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Exploration of Ideological and Political Elements and Research of Assessment Mechanism under the Background of Great Ideological and Political Education CHEN Shuisheng 2024, 49(7): 177-180.  DOI: 10.16638/j.cnki.1671-7988.2024.007.033 Abstract ( )   PDF (1044KB) ( )   The curriculum ideological and politics break through the boundaries of the subjects, using the professional courses as carriers and integrating the ideological and political education into the knowledge transmission and the ability cultivation, which provides a new path for achieving the fundamental task of cultivating morality and talent. The exploration and integration of ideological and political elements in the curriculum ideological and political education is a theme that adapts to the different situations and keeps up with the times. Taking the typical professional course of Automobile Theory in New Engineering and Technical Disciplines as an example, the organic coupling of the ideological and political element exploration and the knowledge transmission is discussed in this paper, highlighting the importance of ideological and political content in the curriculum ideological and political education. Through the course of Automobile Theory in the ideological and political education, while enhancing the effectiveness of students' knowledge learning, aims to achieve the value guidance for students in terms of the professional literacy, the ecological civilization and the patriotism sentiment. References | Related Articles | Metrics

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Teaching Reform and Practice of the Electric Vehicle Technology Course in the Integration of Automotive Skills Competition under the OBE Concept TAN Yudian 2024, 49(7): 181-184.  DOI: 10.16638/j.cnki.1671-7988.2024.007.034 Abstract ( )   PDF (1191KB) ( )   In order to better cultivate technical and skilled talents in the automotive industry, based on the outcome based education (OBE) concept, student-centered, learning outcomes oriented, and combined with the current teaching needs of Electric Vehicle Technology course, vocational college automotive skills competitions and regulations are integrated to achieve rapid improvement of students' overall quality. By exploring teaching methods and models, aims to provide strong support for the teaching reform and practice of the core courses of electric vehicle technology, and accelerate the cultivation of composite technical and skilled talents in automotive majors in vocational colleges. References | Related Articles | Metrics

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Course Research of New Energy Vehicle Control System under the Background of "Golden Course" XU Xiaoyu 2024, 49(7): 185-188.  DOI: 10.16638/j.cnki.1671-7988.2024.007.035 Abstract ( )   PDF (1285KB) ( )   This paper introduces the experience and practice of the new energy vehicle control system overhaul course construction and practice under the background of "golden course". Under the background of gold class, teachers are required to continuously enrich classroom teaching content and adopt diversified teaching methods to achieve better teaching effects. In this context, through the analysis of the control system of new energy vehicle, this paper designs a course system for vehicle maintenance based on the model of "skills-task-knowledge" and adopts task-driven teaching method. By combing knowledge points into multiple tasks, the vehicle control system maintenance practice and theoretical knowledge are combined to gradually improve the students' practical operation ability. At the same time, this paper introduces the design and implementation of the experimental teaching platform based on virtual simulation technology, which provides students with a more real and intuitive experimental environment and lays a good foundation for the later practical teaching. Finally, through the actual teaching practice and feedback from students, the learning difficulty of the new energy vehicle control system course is effectively reduced, and the learning efficiency and learning enthusiasm of students are effectively improved. References | Related Articles | Metrics

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Application Analysis and Development Trend of Virtual Commissioning Technology in Automobile Manufacturing Industry ZHUANG Jingxiong 2024, 49(7): 189-194.  DOI: 10.16638/j.cnki.1671-7988.2024.007.036 Abstract ( )   PDF (2703KB) ( )   This article explores the application advantages by introducing the offline programming, linkage simulation, and virtual commissioning technology of robots in the body in white production line of the automotive manufacturing industry. Taking the high density robot repair welding station as an example, the off-line debugging time and labor cost of four technical solutions, including manual teaching, off-line programming, linkage simulation and virtual debugging are compared. It is found that using linkage simulation or virtual commissioning technology not only saves labor costs, but also reduces on-site debugging time by about 60%. The article also proposes the idea of further developing virtual debugging technology, believing that automatic path planning, agile modeling, and enhanced virtual reality fusion are the development trends. References | Related Articles | Metrics