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Comparative Study of Power Module Heatsinks on Electric Vehicle with Various Configurations Based on Fluent MA Yaqing Automobile Applied Technology    2022, 47 (6): 100-104.   DOI: 10.16638/j.cnki.1671-7988.2022.006.021 Abstract （80）      PDF （3964KB）（965）       Comparative study on the thermal simulation of heatsinks on electric vehicle with various configurations for Insulated-Gate Bipolar Transistor has been undertaken in this paper. For the purpose of validation of numerical module, a simulation was conducted in the first place for diamond pinfin heatsink. The reliability of the chosen fluid model, mesh density and material properties have been demonstrated through the close agreement between the numeral results and experimental data. With the verified model, a circular pinfin heatsink has been established to ensure the identical pressure drop with diamond one in order to identify the dimension of the circular pin. By introducing the power module with certain power loss, the thermal simulations on these two heatsinks have been carried out. Through the comparison of the numerical results, it has been shown that the junction temperatures of the power modules from circular configuration are about 1.5% higher than the ones from diamond one and the highest surface temperatures of the heatsinks are in good consistence. Nevertheless, these results comply with the product specifications.With the consideration of 27% weight loss compared to the diamond pinfin structure, circular pinfin configuration is assumed as a better choice for power module heatsink. In this study, the verified numerical model contributed to analyse the heat dissipation and temperature distribution of the power module and helped to select the optimum configuration of pinfin structure. Hence, the experiment cost and time for the product development can be substantially reduced. Reference | Related Articles | Metrics

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Application of VAVE in New Energy Vehicle Industry LIU Wei Automobile Applied Technology    2021, 46 (16): 165-168.   DOI: 10.16638/j.cnki.1671-7988.2021.016.045 Abstract （117）      PDF （1042KB）（297）       In the context that China is the main battlefield of new energy vehicles in the world, combined with the unfavourable factors such as the gradually declining of state subsidies and the continuous downward price pressure from the domestic Tesla Model 3, the design cost of mass-produced vehicles can be continuously optimized by relying on VAVE management tools, the aim of which is to improve the comprehensive quality-price ratio of products, without making compromise to the product quality and customer perception. Practice shows that VAVE is a powerful tool to improve the product competitive of new energy vehicles. Reference | Related Articles | Metrics

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Design and Modal Analysis of Automobile Instrument Panel Cross Car Beam GAO Weiwei Automobile Applied Technology    2023, 48 (8): 117-120.   DOI: 10.16638/j.cnki.1671-7988.2023.08.020 Abstract （99）      PDF （1516KB）（276）       This paper introduces some important parameters of structural design about cross car beam, such as material selection, beam main and auxiliary pipe beam and other installation support.For the vehicle in road test, considering the mode of the instrument panel beam in the design process, avoid the engine idle condition of the natural frequency and the instrument panel beam mode frequency similar resonance sound, through computer aided engineering (CAE) software analysis of a car instrument panel beam assembly module, and combined with relevant internal standards, the design beam to meet the design requirements, avoid the subsequent beam costs, designed to provide reference for the subsequent similar structure design. Reference | Related Articles | Metrics

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Current Situation and Prospect of Redundancy of Electric Vehicle Line Control System DENG Dejie, CHEN Wenxi, HU Zhuo, ZHANG Guozheng, ZHAO Chenbo Automobile Applied Technology    2025, 50 (4): 9-15.   DOI: 10.16638/j.cnki.1671-7988.2025.004.002 Abstract （55）      PDF （2314KB）（167）       As one of the keys composition to the intelligent chassis control system of electric vehicle, the brake-by-wire system is the basis for realizing the braking control of autonomous vehicle. With the increasing requirements of vehicle intelligence, the requirements of braking system also increase, and the brake-by-wire system with redundant backup function is getting more and more attention. This paper expounds the structure, composition and function of the brake-by-wire system from two aspects of electronic hydraulic brake (EHB) system and electronic mechanical brake (EMB) system, simply introduces the redundancy principle and characteristics of different brake-by-wire system, and puts forward the development prospect of the redundancy of electric vehicle brake-by-wire system. As a result, multi-level redundancy control of the brake-by-wire system will be the direction of future focal point research. Reference | Related Articles | Metrics

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Research on the Energy Management Strategy of Hybrid Electric Vehicles Based on ECMS-MPC HE Qi Automobile Applied Technology    2022, 47 (20): 19-22.   DOI: 10.16638/j.cnki.1671-7988.2022.020.005 Abstract （71）      PDF （1114KB）（194）       Under the background of energy conservation and emission reduction, energy management and control strategy is the key factor to determine the power, economy and emission of hybrid electric vehicles. In this paper, the mathematical model of the single axle parallel hybrid electric vehicle and its components is established based on MATLAB. On the basis of system modeling, an energy management strategy based on the minimum equivalent fuel consumption prediction model control (ECMS-MPC) is proposed and compared with the energy management and control strategy of dynamic programming (DP). Simulation results show that ECMS-MPC control strategy is close to DP energy management and control strategy in technical results. In terms of computing efficiency, ECMS-MPC control strategy is 6 times higher than DP energy management and control strategy. The superiority of ECMS-MPC control strategy is demonstrated. Reference | Related Articles | Metrics

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Vehicle-borne Network Communication System Based on Flexray Bus HUANG Xiaopeng Automobile Applied Technology    2022, 47 (2): 11-15.   DOI: 10.16638/j.cnki.1671-7988.2022.002.003 Abstract （70）      PDF （1251KB）（190）       With the automobile coming into an era of intelligence and electrification, the demand for vehicle-borne network technology is getting higher and higher. As the bus system of a new generation, FlexRay is applied more and more. This paper analyzes the advantages, topological structure and timeliness of Flexray vehicle-borne network system, moreover, it summarizes the specific application of Flexray vehicle-borne network system in vehicles, and explores the development trend of vehicle-borne network technology. Reference | Related Articles | Metrics

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Overview of Lightweight Technology for Commercial Vehicle WANG Xiaolong, FENG Shirong Automobile Applied Technology    2025, 50 (1): 136-141.   DOI: 10.16638/j.cnki.1671-7988.2025.001.028 Abstract （80）      PDF （1474KB）（158）       The lightweight design of commercial vehicles is one of the current research hotspots in the automobile industry. By reducing the weight of vehicles, it can effectively improve fuel economy, reduce carbon emissions, and improve vehicles handling performance and safety. This paper discusses the background and significance of lightweight commercial vehicle in detail, focusing on the application of aluminum alloy, high strength steel and composite materials in body structure, wheels and chassis. At the same time, introduces the application of advanced manufacturing technologies such as 3D printing, laser welding and integrated die casting technology in lightweight design, and the corresponding connection technology, such as riveting, bonding and bolted connection. Typical case studies demonstrate the practical effects of lightweight measures, including improved fuel economy, reduced carbon emissions and improved vehicle performance. Finally, this paper summarizes the positive impact of lightweight design on the overall performance of commercial vehicles, and looks forward to the future development direction. Reference | Related Articles | Metrics

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Analysis of UN ECE R155 Certification Scheme for Vehicles QIAO Changxin1 , ZHANG Lingxiao*2 , LIU Jinliang1 Automobile Applied Technology    2024, 49 (15): 148-153.   DOI: 10.16638/j.cnki.1671-7988.2024.015.030 Abstract （25）      PDF （1250KB）（155）       In response to the network security and consumer privacy risks that arise in the development of digitalization, networking, and automation of automotive products, UN/WP.29 has officially issued the UN ECE R155 regulation, which is strict and difficult to apply for certificates. This article analyzes the requirements of R155 regulations and proposes the automotive network security requirements that enterprises need to meet in response to the certification process of R155 regulations, it is of great significance for promoting sufficient network security protection capabilities of enterprise products and meeting the overseas market access needs of enterprises. Reference | Related Articles | Metrics

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Design of Teaching Platform of Electric Vehicle Charging System Controlled by CAN Bus YAN Jingming, WANG Ruoxin, WU Jizhang Automobile Applied Technology    2025, 50 (8): 50-57.   DOI: 10.16638/j.cnki.1671-7988.2025.008.010 Abstract （18）      PDF （2752KB）（146）       In order to solve the problem of offline performance testing of the charging system in the teaching of electric vehicle courses, design a controller area network (CAN) bus controlled charging system teaching platform. The article elaborates on the platform design from the composition of the charging system, working principle, platform architecture, hardware selection, software design, and test. Use the USB-CAN interface card to connect the PC as the upper computer to the charging system. Send CAN messages to control the operation of the charging system. Record the output voltage and current values of the 60 s loading test to determine the performance of the charging system. Carry out teaching through the teaching platform, students can master the knowledge and skills of CAN bus control principle of charging system, drive control, and charging machine testing, Provide visual learning scenarios for course instruction, job requirements for the integration of new technologies in electric vehicle repair, enhancing the effectiveness of practical training. Reference | Related Articles | Metrics

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Practice of Blended Learning Mode Based on BOPPPS Model ZHOU Die, DAI Longjiang, YANG Yiqun Automobile Applied Technology    2025, 50 (5): 137-141.   DOI: 10.16638/j.cnki.1671-7988.2025.005.026 Abstract （18）      PDF （1191KB）（136）       This article explores in depth the practical application and effectiveness of the blended learning mode based on the BOPPPS model in the Fundamentals of Automotive Machinery course in vocational schools, analyzes the current problems that exists in the Fundamentals of Automotive Machinery course in vocational schools, studies the BOPPPS model and blended learning mode, and combines the two using the learning platform online teaching platform. A blended learning mode based on the BOPPPS model is designed, and teaching experiments are conducted using task three "automotive valve mechanism" of the Fundamentals of Automotive Machinery course in vocational schools as an example. The results indicate that blended learning based on the BOPPPS model not only enhances students learning interest and classroom participation, but also improves their independent thinking capacity and teamwork abilities, and provides useful references for the teaching reform of related courses. Reference | Related Articles | Metrics

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Research on the Lateral Stability Control of Distributed Drive Electric Vehicle ZHAO Yuehe, LU Pengcheng, ZHANG Duanjun, MA Chao Automobile Applied Technology    2024, 49 (23): 1-5.   DOI: 10.16638/j.cnki.1671-7988.2024.023.001 Abstract （75）      PDF （736KB）（133）       To improve the lateral stability of vehicle, a lateral stability control strategy of distributed drive electric vehicle based on differential drive is proposed in this paper. Firstly, with a distributed drive electric vehicle as the research object, vehicle dynamics model is established using Simulink, and the built model correctness is verified by comparing it with the CarSim vehicle; then, a fuzzy controller (upper level control) is designed with the vehicle lateral angular velocity deviation and the vehicle center of mass distortion angle deviation as inputs, and the additional lateral torque as output. Considering the limitation of tire adhesion and the utilization rate of tire adhesion, the driving torque distribution controller (lower level control) is designed; finally, select typical operating conditions for simulation experiments. The experimental results show that the design vehicle lateral stability strategy can reduce the deviation of vehicle lateral angular velocity by more than 40%, and reduce the deviation of vehicle center of mass distortion angle by more than 80%, thereby making the vehicle's steering motion tend towards neutral turning and effectively improving the vehicle's lateral stability. Reference | Related Articles | Metrics

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Research on Leaching Metal-ions from Spent LiFePO4 Battery Positive Electrode Materials Using Lactic Acid-Based Deep Eutectic Solvents YUAN Zhang1 , JIN Jianjiao*1 , WU Liangqin1 , ZHANG Chenyun3 Automobile Applied Technology    2024, 49 (23): 11-15.   DOI: 10.16638/j.cnki.1671-7988.2024.023.003 Abstract （22）      PDF （743KB）（132）       Deep eutectic solvents, as a new type of green solvent, have shown wide application prospects various fields such as chemistry, biology and material. This study focuses on the positive electrode material of spent lithium-iron phosphate batteries and investigated the leaching effect of metal ions using a deep eutectic solvent prepared with choline chloride (ChCl), lactic acid (LA), and H2O. The leaching effect Li and Fe in the positive electrode was explored by factors such as ChCl/LA molar ratio, solid-liquid ratio, leaching temperature and time. The research results show that under the optimal leaching conditions of ChCl/LA molar ratio of 1:3, solid-liquid ratio of 1:100, leaching temperature of 140 ℃, and leaching time of 8 h, the leaching rates of Li and Fe reached 92.98% and 94.57%, respectively Reference | Related Articles | Metrics

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The Common Faults and Diagnostic Methods of Three-electric System YANG Tiancheng Automobile Applied Technology    2024, 49 (15): 166-170.   DOI: 10.16638/j.cnki.1671-7988.2024.015.033 Abstract （66）      PDF （992KB）（126）       With the increase of new energy vehicles and the rise of complaint about the three-electric system, fault diagnosis has ushered in great challenges. In order to better study this issue, it is necessary to conduct a systematic analysis of common faults and diagnostic methods in the electrical systems. The article categorically described the common faults of battery, motor and electrical control system. Then, four types of common diagnostic methods model-driven method, signal-driven method, data-driven, and expert-system method are introduced. Finally, the directions of future research are simply discussed, so as to provide reference for researchers and promote the development of this area. Reference | Related Articles | Metrics

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Research on the Integrated NVH Simulation of Passenger Car Electric Drive System SHI Tongjie1,2 , NIU Wenbo1,2, LI Bin1,2 , TANG Lechao1,2 , CAI Hui1,2 Automobile Applied Technology    2025, 50 (5): 72-77.   DOI: 10.16638/j.cnki.1671-7988.2025.005.013 Abstract （50）      PDF （1811KB）（123）       The development of electric drive system towards integration leads to the integrated noise, vibration, harshness (NVH) problem. In order to adapt to the trend of integrated development of electric drive, this paper focuses on researching the NVH simulation method of integrated electric drive system, which can realize the integrated modeling of motor and reducer, and consider the vibration and noise simulation calculation of motor excitation and gear meshing excitation together. At the same time, research is carried out to improve the accuracy of the simulation method. Through the measures of flexibility of shafting, adjusting the suspension stiffness and output inertia according to the actual bench installation state, fitting Rayleigh damping curve, etc., the simulation accuracy of the order noise of the electric drive system reaches within ±3 dB(A). This method can help to improve the prediction accuracy of NVH solutions in the early stage of electric drive development and the precise identification of NVH problems in the experimental stage of the later development. Reference | Related Articles | Metrics

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Study on Dual LCL-S Compensation Topology of Electric Vehicle Wireless Charging System LIU Jie, SONG Anran, CHEN Ying Automobile Applied Technology    2024, 49 (24): 11-14.   DOI: 10.16638/j.cnki.1671-7988.2024.024.003 Abstract （64）      PDF （1285KB）（122）       In the research of the radio energy transmission system of electric vehicles, aiming at the problem of the harmonic after the high-frequency inverter, a compensation method is proposed based on LCL-S. This article analyzes the constant-current characteristics of LCL compensation network and a resistive input impedance after compensation. The power factor of the system is improved and transmission characteristic of the system are more stable and efficient. Maxwell, MATLAB and Simplorer are used to carry out joint dynamic simulation and verification of the topology selection of compensation link. The simulation results show that the simulation waveform after LCL-S compensation is more stable. The results show that the transmission characteristics of electric vehicle wireless charging system under LCL-S compensation topology are good. Reference | Related Articles | Metrics

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Optimization of Equivalent Fuel Consumption Minimization Strategy for Plug-in Hybrid Electric Vehicle Using DDPG XU Xiaodong, WEI Wenxiang* , GAN Zidong Automobile Applied Technology    2025, 50 (5): 8-13.   DOI: 10.16638/j.cnki.1671-7988.2025.005.002 Abstract （40）      PDF （1483KB）（113）       To improve the fuel economy of hybrid vehicles, plug-in hybrid electric vehicles are chosen as research subject. The deep deterministic policy gradient (DDPG) algorithm is used to optimize the equivalence factor and battery state of charge (SOC) in equivalent fuel consumption minimization strategy (ECMS). By integrating deep learning's perception abilities with reinforcement learning's decision-making processes, the optimization control of energy management in the hybrid electric vehicle is accomplished. A complete vehicle simulation model is created in MATLAB/ Simulink for experimental purposes. The outcomes demonstrate that, under condition of meeting the vehicle's normal driving power demands, fuel consumption based on DDPG algorithm optimized equivalent fuel consumption minimization algorithm is significantly lower than that of double deep Q network (DDQN) and traditional ECMS, while maintaining battery SOC balance, ensuring multi-objective optimization. Reference | Related Articles | Metrics

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Calculation of Cogging Torque and Electromotive Force of Stator Slotted Motor NING Kuanyu Automobile Applied Technology    2022, 47 (18): 116-119.   DOI: 10.16638/j.cnki.1671-7988.2022.018.023 Abstract （31）      PDF （1355KB）（128）       To address the problem of torque pulsation when the stator slotted motor is running, which makes the powertrain noise, vibration and harshness performance worse, this paper establishes a motor model with Maxwell, analyzes the magnetic field distribution of the isolated magnetic bridge using the finite element method, and analyzes the relationship between motor counter-electromotive force, cogging torque and rotational speed under different operating conditions. The results show that the isolated magnetic bridge can improve the magnetic field distribution and reduce the magnetic leakage. The electric potential is proportional to the motor speed, and the cogging torque does not change much with the increase of rotational speed, so the cogging torque of the 12-pole 72-slot motor is optimized at low speed using the segmented diagonal pole method at low rotational speed. Reference | Related Articles | Metrics

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Vehicle LiDAR Key Technology and Its Performance Requirements in Advanced Assisted Driving WANG Xiangyong, WANG Xixi, DAI Lili Automobile Applied Technology    2024, 49 (12): 24-28.   DOI: 10.16638/j.cnki.1671-7988.2024.012.006 Abstract （33）      PDF （1052KB）（125）       With the development of intelligent driving technology, vehicles have put forward high precision requirement for the perception of driving environment, and in the multi-sensor cross-fusion scheme, light detection and ranging (LiDAR) is the key sensor to provide real time, high precision, full scene environment perception for vehicles. To figure out the trends in LiDAR technology, based on the architecture of LiDAR optoelectronic system and the basic principles of electrical detection, this paper expounds the key technologies of forward long range vehicle LiDAR, and systematically introduces the design principles and technical difficulties of LiDAR transceiver control system, scanning and optical system, photoelectric detection and signal processing system and other modules, and meanwhile analyzes the technical route selection of LiDAR. From the perspective of application, the basic performance requirements of vehicle-mounted LiDAR are put forward, and the latest development trend of vehicle-mounted LiDAR is summarized. Reference | Related Articles | Metrics

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Ultrasonic Measurement Method and Application of Bolt Preload LV Fengyang Automobile Applied Technology    2023, 48 (17): 144-149.   DOI: 10.16638/j.cnki.1671-7988.2023.017.026 Abstract （187）      PDF （1462KB）（165）       Bolt preload is one of the key factors affecting the reliability of bolt connection, and it is of great application value to measure bolt preload directly and accurately. Firstly, based on the principle of acoustoelastic effect, the relationship between ultrasonic propagation speed and axial stress of bolts is studied theoretically, and the calibration relationship between bolt preload and ultrasonic acoustic time difference is established in this paper. Secondly, the influencing factors of ultrasonic measurement of bolt preload are analyzed. Finally, the ultrasonic measurement method and application case of bolt preload are given. The MC900 ultrasonic measuring analyzer is used to monitor the preload attenuation of the dashboard beam and body bolts of a certain vehicle. The test results meet the durability and reliability requirements of the vehicle. The research results show that the ultrasonic preload measurement technology can well monitor the preload changing trend of bolt connection points during the endurance road test of the vehicle, and provide experimental basis for verifying the rationality of bolt tightening torque setting and analyzing the quality problem of torque attenuation. Reference | Related Articles | Metrics

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Decoupled Suspension Design and Motion Simulation Analysis of Chines Formula SAE QUAN Shuanglu1 , WEI Shuai1 , FEI Fengyu 2 , HU Gailing1 Automobile Applied Technology    2024, 49 (15): 59-62.   DOI: 10.16638/j.cnki.1671-7988.2024.015.012 Abstract （69）      PDF （1726KB）（104）       The suspension system is an important part of the vehicle, contributing significantly to the handling stability of a race car. In order to adapt to the varying track conditions of the formula student electric China (FSEC) to different track environments and reduce the mutual influence of the two side wheels during leaning and rolling, a fully decoupled suspension structure is designed. This suspension system includes guiding mechanisms, shock absorbers, lateral anti-roll bars, etc. Through the geometric parameter design and mechanical analysis of two shock absorbers and their connected guiding mechanisms, the separation of the car's roll stiffness and pitch stiffness are effectively achieved. The study conducts kinematic simulation and analysis of the decoupled suspension system using MATLAB. The results indicate that this structure exhibits minimal influence between the two shock absorbers during the vehicle's leaning and pitching, enabling independent control and adjustment of the car's roll stiffness and pitch stiffness. This design enhances the overall handling performance of the race car, making it more adaptable to race tracks, thereby assisting in improving the performance of the racing team. Reference | Related Articles | Metrics