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Lithium-ion Battery Health State Estimation Based on LSTM Neural Network ZHANG Xiaofan1 , CHEN Yilong*1 , LI Shengqian2 , ZENG Xiangkun1 , LIAN Xin1 , HUANG Cheng3 Automobile Applied Technology    2025, 50 (1): 1-6.   DOI: 10.16638/j.cnki.1671-7988.2025.001.001 Abstract （90）      PDF （994KB）（73）       Battery state of health (SOH) is an important parameter to characterize battery performance, and accurate SOH estimation is important for battery management and maintenance. The aim of this study is to build a battery SOH estimation model using a long-short-term memory (LSTM) neural network, and to obtain the best model accuracy under different iteration numbers. In this paper, real-time battery operation data are first collected and cleaned and filtered. Then, constant-current charging time, constant-voltage charging time and average discharge voltage are selected as feature indicators to predict the battery health state. By comparing and analyzing the real and predicted values of the three batteries, and the values of mean absolute percentage error (MAPE), root mean square error (RMSE), mean absolute error (MAE) and relative error (RE) evaluation indexes, the accuracy of the three battery models is obtained to be above 98%. The experimental results show that the SOH estimation algorithm based on LSTM has accuracy and feasibility. Reference | Related Articles | Metrics

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Research and Application of Magnetorheological Damping Technology ZHANG Weiqin, DU Jinzhi, HU Qunlin, LIU Hailiang Automobile Applied Technology    2024, 49 (17): 83-87.   DOI: 10.16638/j.cnki.1671-7988.2024.017.017 Abstract （89）      PDF （1166KB）（33）       Magnetorheoloical damping technology, as an advanced semi-active control technology for automotive suspensions, has received widespread attention over the past few decades. This study aims to explore the application of magnetorheological damping technology in automobile suspension systems to enhance vehicle stability and comfort during driving. By analyzing the working principle of magnetorheological fluid and its rapid response capability under magnetic fields, an automotive shock absorber based on magnetorheological damping technology is designed. Laboratory tests are conducted according to automotive shock absorber performance testing standards, along with subjective evaluations of automobile handling and stability performance. The results indicate that the magnetorheological damper can effectively and rapidly adjust the damping force, adapting in realtime to road conditions, significantly reducing vehicle body vibrations, and improving driving comfort, showcasing a clear performance advantage over traditional shock absorbers. This study validates the effectiveness of magnetorheological damping technology in enhancing automobile performance, providing theoretical support for further product development and bulk automotive applications. Reference | Related Articles | Metrics

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The Development Status and Trend of Automotive Intelligent Cockpit ZHANG Hong, WU Yaheng* , LIU Peiwen, DONG Yiping Automobile Applied Technology    2024, 49 (18): 166-169.   DOI: 10.16638/j.cnki.1671-7988.2024.018.033 Abstract （86）      PDF （1084KB）（93）       With the continuous development of new energy and intelligent vehicle industries, traditional intelligent cabins can no longer meet the demand for intelligent vehicles. Major automakers have gradually integrated and upgraded cockpit functions such as liquid crystal display instruments, information entertainment, and display screens, in order to explore safer, smarter, and more comfortable of transportation modes. This article analyzes and summarizes the current development status of intelligent cabins and the situation of major car companies loading intelligent cabins. The main development trends of intelligent cabins are summarized in five aspects, including enhancing head up display to empower driving with a new visual experience, rich cabin functions and information that still need to be based on travel safety, ruan air conditioner and zero gravity seats will empower the cabin with a new upgrade, multi-modal interaction between humans and vehicles will empower the cabin with a seamless experience, and artificial intelligence generated content (AIGC) technology will empower the cabin scene to continuously upgrade, bringing users a comfortable,convenient and safe driving experience, in order to provide reference for the development of the intelligent cabin industry. 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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Optimization of Lithium-ion Battery Charging Stategy Based on Evolutionary Algorithm ZHONG Yingqun1 , LIU Jing2 , ZHENG Pei*1 Automobile Applied Technology    2025, 50 (1): 13-19.   DOI: 10.16638/j.cnki.1671-7988.2025.001.003 Abstract （72）      PDF （1045KB）（32）       To improve battery performance, it is critical to investigate specifying advanced charging strategies. Based on the differential evolution algorithm, a multi-stage constant current charging strategy considering battery life and charging efficiency is proposed. Firstly, combining the external characteristics and internal mechanism of lithium-ion batteries, the coupling model of electrical, thermal and life is established. Secondly, according to the above coupled model parameters, the optimization equation aiming at the service life and charging speed is further constructed. Finally, the differential evolution algorithm is used to determine the optimal charging current in each constant current segment. Developing a safe and fast charging strategy that meets consumer needs is not only conducive to the promotion and popularization of electric vehicles, but also contributes to the long-term sustainable development of the country. Reference | Related Articles | Metrics

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Analysis of Production Process of New Energy Vehicle Battery Pack Lower Box LIU Wufeng Automobile Applied Technology    2024, 49 (19): 122-126.   DOI: 10.16638/j.cnki.1671-7988.2024.019.024 Abstract （69）      PDF （1452KB）（39）       The battery pack lower box is a key component of new energy vehicles, which can provide protection for the battery pack and support the overall structure of the battery pack, and also affect the side impact performance, driving range and service life of the vehicle. In this paper, the advantages and disadvantages of the main production processes such as steel stamping, high strength steel roll pressing, steel aluminum mixing, aluminum alloy extrusion and aluminum alloy die casting are analyzed. The recommended index table for the design, development and application of the battery pack box is summarized, which is helpful to quickly select a reasonable production process of the battery pack box during the project development. This improves the production efficiency of the battery pack lower box, reduces production costs, adapts to market demand, and promotes the development of the new energy vehicle industry. Reference | Related Articles | Metrics

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Vehicle Modeling and Simulation Based on ADAMS LI Qian1 , LIU Wei1 , CHEN Zeliang2 , LI Hang1 , HUANG Dong*2 , WEI Jianfeng3 Automobile Applied Technology    2025, 50 (1): 31-36,51.   DOI: 10.16638/j.cnki.1671-7988.2025.001.006 Abstract （66）      PDF （1006KB）（47）       In this paper, the stiffness, power and friction parameters of a vehicle steering system are extracted by bench test, and the parameters are built into the corresponding model and input into the steering system model. Then, three typical operating conditions of steady turning with fixed radius, steering wheel angle step and central steering are studied by simulation and experiment. The results show that the simulation model with accurate modeling can predict each evaluation index more accurately, and also has higher prediction accuracy for the test results of steering wheel torque. The ADAMS/Car model is exported to VI-CarRealTime model by add-on, and the establishment method of the VI-CarRealTime rack and pinion model is described in detail. The calibration accuracy of VI-CarRealTime and ADAMS/Car model is further verified by building a rack and pinion model. In this study, the modeling and simulation methods of the steering system are deeply discussed, and good prediction accuracy is obtained in the experimental verification. It is of great significance to improve the accuracy and efficiency of vehicle steering system design, and provides a valuable reference for research and practice in related fields. Reference | Related Articles | Metrics

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Performance Optimization and Lightweight Design of Automotive Lower Control Arm CHEN Zhiyang, HU Li, ZHANG Guiyin* , LIU Hui, ZHANG Jianhua, CHEN Zhengkang, LI Ying Automobile Applied Technology    2024, 49 (17): 50-54.   DOI: 10.16638/j.cnki.1671-7988.2024.017.010 Abstract （65）      PDF （2238KB）（41）       The lower control arm needs to have a certain strength and stiffness to resist extrusion, impact deformation, and also needs to have a high natural frequency to avoid low-frequency resonance and noise. Taking the lower control arm of a research automotive as the lightweight design object in this paper, the design risk of insufficient buckling force is identified through simulation analysis, and the control arm is redesigned using a combination of shape and topology optimization methods, and performance simulations are conducted on the new design. The results show that the new control arm eliminated the design risk of insufficient buckling force, resulting in 6.6% weight reduction compared to the original design. This paper adopts linear optimization method to solve the highly nonlinear buckling force optimization problem, identifies the load transmission path through topology optimization, and provides new ideas for the buckling force optimization and lightweight design of automotive control arms. Reference | Related Articles | Metrics

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Integration and Research of Intelligent Comprehensive Thermal Management Control System for Bus Based on Fuel Cell WANG Haitao Automobile Applied Technology    2025, 50 (1): 7-12.   DOI: 10.16638/j.cnki.1671-7988.2025.001.002 Abstract （60）      PDF （1079KB）（64）       In order to solve the problem of high energy consumption of single electric heating system of fuel cell bus and reduce heat loss, an integrated intelligent comprehensive heat management control strategy for the whole vehicle is proposed based on the traditional distributed heat control strategy of fuel cell engine of hydrogen fuel bus. The heat generated by the fuel cell engine during operation is recycled, and the heat is fully converted by plate-fin heat exchanger and used for heating in passenger cabin and defrosting and defogging of front windshield. Realize high integration and fine thermal management. This technology can reduce the energy consumption of a single electric heating system, improve the heating comfort experience of the whole vehicle and greatly improve the economic performance of the whole vehicle. Reference | Related Articles | Metrics

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Research on the Vehicle Durability Test Objectives Based on User Driving Conditions LIU Sutao, CHEN Haijiang, YU Xiaohui, QIU Yu Automobile Applied Technology    2025, 50 (1): 69-74.   DOI: 10.16638/j.cnki.1671-7988.2025.001.014 Abstract （53）      PDF （2432KB）（32）       As an important part of the vehicle development process, the vehicle structure durability test plays a crucial role in validating and evaluating the vehicle structure and vehicle systems. It is particularly critical to establish durability test objectives that are user-centered and align with actual user use. This article proposes a method for determining vehicle durability test objectives based on user driving conditions. Firstly, user typical driving conditions and the mileage distribution within each condition are obtained using machine learning clustering algorithms based on actual user driving data. Secondly, real vehicle road spectrum loads are collected on public roads to obtain the corresponding load damage under different driving conditions. Finally, the user driving conditions are correlated with the damage objectives of real vehicle road spectrum loads, resulting in durability test damage objectives that are linked to the user. Reference | Related Articles | Metrics

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Roewe i5 Engine Starting Difficulty Analysis MA Cheng1 , WANG Fangcheng2 , Ailixiati Abulizi1 , ZHOU Yanyan1 , ZHAO Xiaolong1 Automobile Applied Technology    2025, 50 (1): 109-112.   DOI: 10.16638/j.cnki.1671-7988.2025.001.022 Abstract （53）      PDF （2207KB）（20）       With the increasingly stringent emission regulations, the engine electronic control technology is continuously optimized, and more and more sensors and electronic control systems are applied to the engine, so higher requirements are put forward for the diagnosis and elimination of engine circuit faults. This article will take the Roewe i5 engine starting difficulty fault as an example, and deeply analyze the structure, working principle and detection method of its crankshaft position sensor, which is also applicable to MG 3 MG 5 and other models using the same Bosch crankshaft position sensor, in order to provide reference opinions for relevant owners and maintenance personnel. Reference | Related Articles | Metrics

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Analysis of Mechanical Properties of Scroll Compressor Drive Bearing for Electric Vehicles YUAN Mengli1 , YANG Bin*1 , LI Annan1 , GAO Feng1 , GE Mengqi1 , LUO Pengkang2 Automobile Applied Technology    2024, 49 (18): 1-6.   DOI: 10.16638/j.cnki.1671-7988.2024.018.001 Abstract （53）      PDF （1581KB）（40）       The purpose of this paper is to delve deeply into the issue of bearing wear in electric vortex compressors caused by disturbances from gas forces during operation. It elaborates extensively on the interference of gas forces on the equilibrium state of the transmission system and analyzes the adverse effects of vibrations on the driving bearings and overall machine performance. To enhance the accuracy and reliability of the rotor system in the vortex compressor, threedimensional structural models and multi-body dynamics model of the rotor system are separately established using the 3D modeling software CATIA and the multi-body dynamics analysis software ADAMS. Through the simulation analysis of the specific speed, the stress of the drive bearing is studied, and the parameters of the related parts are optimized through the design research. The research results show that the force of the driving bearing presents a significant periodic change, especially in the x and y directions, resulting in secondary unbalance of the system. Through optimization, the force of the driving bearing is reduced, the friction and wear of the bearing are reduced, the service life is increased, the stability of the scroll compressor is improved, and the vibration and noise of the system are reduced. Reference | Related Articles | Metrics

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Analysis of Chest Rib Deflection Performance Improvement Based on a Specific Vehicle Euro NCAP Side Pole ZHOU Xiaolei, DONG Wei, WANG Ganggang, LI Wenjie,WANG Kun Automobile Applied Technology    2025, 50 (1): 90-96.   DOI: 10.16638/j.cnki.1671-7988.2025.001.018 Abstract （52）      PDF （3161KB）（45）       This article is based on the overall safety development of a new energy vehicle model Euro new car assessment program (NCAP), to conduct the performance study on the chest deflection problem on the side pole test condition. Through the theoretical research on the chest deflection problem and obtain the relative influence factors. And by using the research method of finite element simulation analysis, sled test and vehicle barrier test verification. The optimization of BIW structure, airbag layout, seat foam design is proposed, which finally improved the vehicle crash performance. This article shows that the safety space of occupant, the safety restraint on the dummy, the stability of the seat state, etc., all have an important impact on the chest deflection performance, and the proposed solution is verified by the vehicle test and to be believed that is feasible. Reference | Related Articles | Metrics

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Common Problems and Countermeasures of Hydrogen Fuel Cell Vehicles in Low Temperature Environment YI Yafei, WANG Nan, DING Xinjian, YANG Fengyi, ZHANG Yu Automobile Applied Technology    2024, 49 (19): 13-16,39.   DOI: 10.16638/j.cnki.1671-7988.2024.019.003 Abstract （51）      PDF （722KB）（39）       As a potential clean energy vehicle, hydrogen fuel cell vehicles (FCVs) have attracted much attention for their environment-friendly and high energy-efficient characteristics. However, their operation in low temperature environments faces significant problems and challenges, which not only affect vehicle performance, but also may limit their application in cold regions. This paper aims to discuss the main problems and challenges faced by FCVs in low temperature environment. Through the analysis of the working principle of hydrogen fuel cells and the study of the influence of low temperature on material properties, a series of problems such as start-up difficulties, reduced hydrogen storage safety, and reduced engine life are revealed. The possible solutions are proposed from the aspects of materials, fuel cell technology, vehicle and operation. Reference | Related Articles | Metrics

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Insulation Detection Method and Fault Analysis of Battery Electric Commercial Vehicle FAN Ning, YANG Jie, DONG Xin, GAO Xing, LI Bin Automobile Applied Technology    2024, 49 (17): 8-12,24.   DOI: 10.16638/j.cnki.1671-7988.2024.017.002 Abstract （47）      PDF （3452KB）（47）       The working condition of battery electric commercial vehicle has complex road conditions and harsh working conditions, which leads to the acceleration of the wear rate of the vehicle electrical equipment, resulting in the continuous decline of the insulation resistance of the electrical equipment, and if not handled in time, there may be safety hazards or cause major safety accidents. Based on the principle of insulation fault detection, this paper analyzes and explores the application of an insulation detection and positioning technology, and a set of low-voltage signal transmission system consisting of insulation detector, current transmitter, current transformer and insulation fault locator is connected and installed in each high-voltage circuit of the vehicle. Through the real-time transmission of the system current signal, the fault loop is quickly and accurately located and the fault location is locked. This technology provides a fast, efficient and accurate solution for the investigation of faulty vehicles in the aftermarket. Reference | Related Articles | Metrics

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Lightweight Design and Application of Commercial Vehicle Chassis YU Dong1 , ZHOU Wen1 , LAN Jun1 , LI Jun1 , XIAO Fei*1 , WANG Jiahan2 Automobile Applied Technology    2024, 49 (17): 33-37,49.   DOI: 10.16638/j.cnki.1671-7988.2024.017.007 Abstract （47）      PDF （3050KB）（49）       This article summarizes and analyzes the engineering application of chassis lightweight technology in a domestic commercial vehicle enterprise. It analyzes the lightweight technology of chassis at home and abroad, as well as the future development trends and challenges. It proposes that the current main lightweight technology route for commercial vehicles is to adopt lightweight and high-strength advanced materials, and to integrate advanced optimization design methods with advanced manufacturing processes. The article focuses on listing the engineering application of chassis lightweight technology and the achieved weight reduction effects in the application of ultra-high-strength steel frame assembly, ultra-high-strength steel front lower protection, high-grade ductile iron front connecting beam, high-stress material leaf spring,aluminum alloy leaf spring bracket, and high-efficiency cooling module lightweight technology. This provides valuable engineering reference for technical personnel engaged in the development and research of chassis lightweight technology in the commercial vehicle industry. Reference | Related Articles | Metrics

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Research on the Impact of Accelerating the Development of New Energy Vehicles on Professional Curriculum Reform School of Automobile and Traffic Engineering, Liaoning University of Technology Automobile Applied Technology    2024, 49 (18): 158-161.   DOI: 10.16638/j.cnki.1671-7988.2024.018.031 Abstract （46）      PDF （1088KB）（8）       New energy vehicle; Professional curriculum; Curriculum reform Reference | Related Articles | Metrics

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Design and Research on Information Security of Vehicle Remote Diagnosis WANG Na, LIU Xu, HU Qiwen, LUO Hao, LIN Huiwen Automobile Applied Technology    2024, 49 (18): 34-37,49.   DOI: 10.16638/j.cnki.1671-7988.2024.018.006 Abstract （45）      PDF （859KB）（45）       Intelligent vehicles commonly utilize remote diagnostic technology to obtain information about the vehicle's operational status and efficiently resolve vehicle malfunctions. To prevent hackers from exploiting security vulnerabilities in the remote diagnostic system for unauthorized operations that threaten the safety of users' lives and property, this paper conducts information security design and research based on a general remote diagnostic system architecture. Through detailed security threat and risk analysis, this study thoroughly investigates information security protection schemes and key technologies (such as identity authentication, secure storage, etc.), and adopts effective implementation plans. By reverification of threat analysis and risk assessment, it can significantly enhance the protective capabilities of the remote diagnostic system and reduce information security risks. Reference | Related Articles | Metrics

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Research on Low Wind Resistance Characteristics in Automobile Styling Design FU Jianbo, ZHANG Jun, WANG Dapeng Automobile Applied Technology    2024, 49 (17): 55-59.   DOI: 10.16638/j.cnki.1671-7988.2024.017.011 Abstract （45）      PDF （2753KB）（25）       With the continuous popularization of new energy vehicles, battery life has always been the focus of people's attention. Reducing the air resistance during driving can effectively improve its range, and how to maximize the reduction of air resistance is the direction that the styling design field is constantly researching. This article first elaborates on the importance of car styling design and its relationship with air resistance, and then focuses on exploring the ideas and methods of maximizing the reduction of air resistance in the styling design process. That is, continuously optimizing and improving the styling features and conducting computer aided engineering (CAE) simulation analysis under the premise of meeting the styling design intention, and obtaining the final improvement plan through comparative analysis of CAE simulation results. At the same time, the main influencing factors of air resistance in styling design are summarized, and low wind resistance characteristics and recommended values are extracted, providing valuable experience and technical support for subsequent product styling design work. Reference | Related Articles | Metrics

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Research on Field Vehicle-in-the-Loop Simulation Test System and Bus Injection TANG Yichao1 , SONG Yongxiong2 , PAN Deng2 , WU Dongbo2 , MENG Zhangjie1 , HE Bing2 , LU Bin2 Automobile Applied Technology    2024, 49 (17): 88-94.   DOI: 10.16638/j.cnki.1671-7988.2024.017.018 Abstract （44）      PDF （2343KB）（42）       The field vehicle in-the-loop simulation test system combines the real dynamics of real vehicle testing with virtual scene simulation technology, which is characterized by high test realism, diversified test scenarios and high test safety. This paper firstly introduces the field vehicle in-theloop simulation test system and its sub-system composition, secondly proposes a detailed design for the bus data injection subsystem, and then builds a vehicle field in-the-loop simulation test system based on this design, carries out the field real-vehicle test and the simulation scenario test, and finally carries out the comparative analysis of the test data, which verifies the high realism and high reproducibility of the test system. In the article, an optimized design of the bus data injection subsystem is provided to ensure that the system improves the scalability and portability of the whole test system under the premise of maintaining a high degree of realism and high reproducibility, which provides an important reference for the future industry to develop a field vehicle inthe-loop simulation test system. Reference | Related Articles | Metrics