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15 August 2021, Volume 46 Issue 15    Next Issue
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Use and Maintenance
Automobile Education
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New Energy Vehicle

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Hydraulic Forming Experiment and Simulation Analysis of Battery Shell Based on Dynaform ZHANG Weixuan, YANG Jiachun, LI jian, ZHOU Fuxin 2021, 46(15): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2021.015.001 Abstract ( )   PDF (2901KB) ( )   In this paper some brand electric car battery shell hydroforming process simulation analysis, first of all, through the experimental platform to build hydraulic forming hydroforming experiments, secondly, based on nonlinear finite element software DYNAFORM hydraulic simulation, prove the correctness of the finite model and simulation method, since then on the basis of some brand electric car battery shell finite element modeling, analysis of the conditions of different pressure circle edge pressure, hydraulic pressure battery shell wall thickness, the influence of hydraulic deep drawing forming technology for battery shell to offer reference to the practical application. References | Related Articles | Metrics

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Modeling and Simulation Analysis of Two-gear Pure Electric Vehicle WANG Xu, SHEN Caiying, YANG Jun, LIU Bin 2021, 46(15): 6-8.  DOI: 10.16638/j.cnki.1671-7988.2021.015.002 Abstract ( )   PDF (1222KB) ( )   In this paper a kind of pure electric vehicles as the research object, in order to improve the vehicle performance, to reduce the operation cost, the original car carrying a fixed ratio of single stage design for two main reducer gear automatic transmission, by using cruise software to complete the construction of the whole vehicle model and simulation, the original car to pick up two speed transmission of the electric vehicle simulation results are analyzed. References | Related Articles | Metrics

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Research on Thermal Management Control Strategy and Energy Consumption Evaluation of Battery System JIANG Feng, YAN Minghan, YAN Shiwei, LIU Huajun, XU Yuhong, JIANG Jibing 2021, 46(15): 9-13.  DOI: 10.16638/j.cnki.1671-7988.2021.015.003 Abstract ( )   PDF (1996KB) ( )   The appropriate thermal management control strategy in the battery system is of great significance for improving the energy utilization efficiency of the vehicle. This paper evaluates the energy consumption and strategy based on the verified simulation model. The results show that the control water temperature is too high or too low will lead to the increase of thermal management energy consumption, and there is an optimal solution for controlling water temperature; The control flow is within a certain range, and the thermal management energy consumption increases with the increase of flow. In addition, based on the three performance indicators of thermal management energy consumption, constant temperature ratio and temperature drop rate, this paper adopts weighted comprehensive evaluation method to judge the advantages and disadvantages of different water temperature strategies; the result shows that when the water temperature is controlled at 20℃, the comprehensive performance evaluation value is the highest. References | Related Articles | Metrics

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Research on EMC Design and Test of Electric Vehicle Motor Drive System CAO Xiangui, WANG Yi 2021, 46(15): 14-17.  DOI: 10.16638/j.cnki.1671-7988.2021.015.004 Abstract ( )   PDF (1483KB) ( )   This paper introduces the EMC test standard of the motor drive system for electric vehicles, and recommends the standard that parts manufacturers can refer to first. The main interference sources and propagation paths of the motor drive system are analyzed, and the design points for EMC problems in the system design are put forward according to the analysis, and the validity of the design is verified by the ground test of the actual prototype system. References | Related Articles | Metrics

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Analysis and Optimization of Electric Vehicle Power Performance Test Method TANG Xiaohua, XU Jinmei 2021, 46(15): 18-20.  DOI: 10.16638/j.cnki.1671-7988.2021.015.005 Abstract ( )   PDF (565KB) ( )   In this paper, the test method of electric vehicle power performance is briefly introduced, and compared with fuel vehicle power performance test method and electric vehicle energy consumption test method. Combined with the development of electric vehicle industry and the progress of technology in China, the optimization direction of electric vehicle dynamic performance test method is proposed from the aspects of test quality, test items and test sites, which provides reference for the optimization of electric vehicle power performance test method. References | Related Articles | Metrics

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Noise Improvement of Steering System of Pure Electric Bus QIN Cheng, SHENG Jun, GONG Jiaqiang 2021, 46(15): 21-24.  DOI: 10.16638/j.cnki.1671-7988.2021.015.006 Abstract ( )   PDF (1942KB) ( )   This article systematically describes the noise generation and propagation mechanism of the pure electric bus electronic hydraulic power steering system (EHPS). For different noise sources, The control strategy of the steering motor is modified, the inner curve of the stator of the steering pump is adjusted, and the tuner tube is added. Through the real vehicle contrast test. The improvement measures are confirmed, and the noise of steering system can be effectively reduced. References | Related Articles | Metrics

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Application Research of the Vehicle BOM in the New Energy Vehicles WANG Jianqin 2021, 46(15): 25-27.  DOI: 10.16638/j.cnki.1671-7988.2021.015.007 Abstract ( )   PDF (719KB) ( )   Bill Of Material runs through the whole development process of automotive product projects, and is the basis of the data management for R&D design, manufacturing and after-sales service. Especially with the rise of new energy vehicles, automobile companies pay more attention to user experience comfort and user service efficiency. Research on the application of vehicle BOM in the development of new energy vehicles has an important guarantee for to response to user needs in time. This paper mainly studies the working relationship between the vehicle BOM and related departments, as well as the focus of the different stages of the vehicle BOM in the forward development of new energy vehicles. It clarifies the relationship between the BOM and the upstream and downstream departments and the responsibilities in the development process. It is helpful to maximize the function of data management of vehicle parts and better serve users. References | Related Articles | Metrics

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Research on Bench Join-test of the EIC System of Pure Electric Bus WANG Shuangzhu 2021, 46(15): 28-29.  DOI: 10.16638/j.cnki.1671-7988.2021.015.008 Abstract ( )   PDF (869KB) ( )   The join-test verification of the EIC system is a key task in the development of pure electric buses. Based on the join-testing work of one pure electric bus, this paper proposes a bench join-test method of the EIC system. The performance test of the drive motor and the bench join-test of the EIC system is carried out before the prototype is manufactured.So the cycle of vehicle join-test of the EIC system is reduced about 40%, and the quality of test verification is also improved. References | Related Articles | Metrics

Intelligent Connected Vehicle

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A Path-following Driver Model with Adaptive Preview Distance YANG Hao, XUE Feng, SHUI Yongbo, HAN Zhonghai 2021, 46(15): 30-33.  DOI: 10.16638/j.cnki.1671-7988.2021.015.009 Abstract ( )   PDF (1080KB) ( )   According to the forward vision of the driver, different scholars have established different preview driver models. However, when real drivers preview the forward path, they often dynamically adjust the preview distance according to the curvature and boundary conditions of the target path. When the curvature of the target path is large, in order to improve the stability of the vehicle, the driver often puts the preview line of sight closer. When the curvature of the target path is small, the pilot will set the preview distance farther. At the same time, when the vehicle speed is high, the driver's preview line of sight tends to be a long-distance preview. When the vehicle speed is low, the driver's preview line of sight area is previewed at close range. Therefore, when real drivers are tracking paths, they should establish a preview distance adaptive tracking model, which is beneficial to approach the preview mechanism of real drivers. Based on the above analysis, this paper establishes a near and far point preview tracking model based on curvature and vehicle speed.By previewing the choice of far and near points, to adapt to different curvature paths. At the same time, by adjusting the preview distance, the driver's real preview mechanism is approached, and the accuracy and adaptability of path tracking are improved. References | Related Articles | Metrics

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Research of Universal Domain Perception Scheme for Vehicle in Proving Ground Based on Enhanced-smart Road Technology ZHANG Disi, ZHOU Liang, Xie Bo, WU Dirui 2021, 46(15): 34-38.  DOI: 10.16638/j.cnki.1671-7988.2021.015.010 Abstract ( )   PDF (3430KB) ( )   In order to enhance the intelligent ability of the road and enable it to actively perceive vehicles, a framework based on MEC technology and lidar equipment is designed. Firstly, the area is fully covered by multi lidar splicing, and the point cloud data of lidar are analyzed in real time by using MEC. The structured data of traffic participants are obtained, which are encapsulated according to certain standards and specifications. It is transmitted to the visualization system through middleware system. At the same time, the virtual ID and physical ID of the test vehicle can be matched by doorkeeper matching or track matching, so that the administrator can accurately obtain the track information of the test vehicle on the monitor screen without OBUs on vehicle. References | Related Articles | Metrics

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Dynamic Trajectory Planning and Tracking Control of Vehicle Lane Changing Based on Rolling Optimization YUE Lijiao, SHI Li, MENG Jianping 2021, 46(15): 39-44.  DOI: 10.16638/j.cnki.1671-7988.2021.015.011 Abstract ( )   PDF (1902KB) ( )   According to the shortcoming that the traditional lane change trajectory planning method is difficult to effectively deal with the changes of the movement state of the preceding vehicle, a dynamic trajectory planning method for vehicle lane change based on rolling optimization is proposed, and a trajectory tracking controller is designed to track desired trajectory. Firstly, the lane change reference trajectory equation is designed based on the fifth degree polynomial, and the lane change trajectory evaluation index is established to determine the lane change time. Secondly, the lane change dynamic trajectory planning function is constructed. Considering the deviation of the two planned trajectories in consecutive period, the optimal objective function is designed. The constraint of the dangerous envelope ellipse following the movement of the preceding vehicle is established to ensure collision avoidance safety. Considering the stability constraints and road boundary constraints, the dynamic trajectory planning problem is transformed into a rolling optimization problem to plan a dynamic lane change trajectory that can adapt to the changing vehicle in the state. Then, to obtain the desired front wheel steering angle, a model predictive controller is designed. Finally, simulations and hardware-in-the-loop tests of the proposed algorithm are carried out. The simulation and test results show that the proposed method can control the vehicle cope with different lane changing environments, and can ensure the safety and maintain the comfort of lane-changing. References | Related Articles | Metrics

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Research on Autonomous Driving Lateral Control Algorithm Based on Model Prediction XING Siqi, FENG Kai, XUE Lingling 2021, 46(15): 45-47.  DOI: 10.16638/j.cnki.1671-7988.2021.015.012 Abstract ( )   PDF (1282KB) ( )   In recent years, autonomous driving technology has become the trend of research and development in the automotive and related technology industries. In order to improve the accuracy of the motion control of autonomous vehicles, the realization accuracy and accuracy of the control algorithms required for vehicle control have higher require -ments. This paper conducts a joint simulation of vehicle dynamics model and control algorithm for the model predictive control algorithm required in the lateral control technology of autonomous vehicles. It is mainly based on Trucksim and Simulink simulation tools to model the algorithm and vehicle dynamics model, and then the model is simulated and tested to realize the trajectory tracking control of the vehicle, which verifies the accuracy and feasibility of the model predictive control algorithm on the lateral control of the vehicle. References | Related Articles | Metrics

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Vehicle Detection Based on Machine Vision DU Xuefeng, GAO Yue, YANG Wei, ZHANG Yong 2021, 46(15): 48-50.  DOI: 10.16638/j.cnki.1671-7988.2021.015.013 Abstract ( )   PDF (2220KB) ( )   Obstle identification is a very important part in automatic driving technology. In this paper, a recognition system of the vehicle in front of the vehicle based on OpenCV technology is designed. The monocular camera is used for image input, the computer is used to complete image preprocessing, and then the cascade classifier is trained to identify the vehicle. In this paper, the Adaboost algorithm is used for training[1]. The processed image is imported into the vehicle classifier to complete the recognition of the vehicle in front.Through the experiment, the system has good real-time performance and reliability. References | Related Articles | Metrics

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A Method of Lane Line Detection and Tracking Based on Vision GAO Yue, ZHANG Yong, DU Xuefeng, YANG Wei 2021, 46(15): 51-52.  DOI: 10.16638/j.cnki.1671-7988.2021.015.014 Abstract ( )   PDF (1293KB) ( )   This paper uses OpenCV software as the main platform, and establishes a method of lane line detection and tracking based on machine vision. First, detect the lane line area in the picture, and convert each frame of the picture to the bird's-eye view perspective. Then binarize the bird's-eye view to further distinguish the left and right lanes. The sliding window method is used to detect the lane line pixels of the first frame, and find the subsequent lane line pixels around the curve of the first frame to fit the lane line curve. Experiments show that this method can accurately detect lane lines. References | Related Articles | Metrics

Design and Research

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Optimized Design of Fuel Injection Performance of Diesel Engine High Pressure Common Rail Injector ZHAO Chang, ZHU Chunhong, ZHAO Hongxia, CHEN Junjie 2021, 46(15): 53-55.  DOI: 10.16638/j.cnki.1671-7988.2021.015.015 Abstract ( )   PDF (987KB) ( )   The structural parameters of the high pressure common rail injector have an extremely important influence on the fuel injection performance of the diesel engine. This paper takes the high-pressure common rail injector as the research object, uses the AMESIM simulation software to simulate and analyze the high-pressure common rail injector, and optimizes the design and optimization of its four key structural parameters. After comparing the results of cycle fuel injection volume and fuel injection pattern before and after optimization, it was determined that the optimization plan was close to the actual demand value of the project, and the rationality of the optimization plan was determined. References | Related Articles | Metrics

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Research on Abnormal Pressing Sound of Automotive Interiors LI Dongqiang, PENG Yun, HONG Shangpiao 2021, 46(15): 56-62.  DOI: 10.16638/j.cnki.1671-7988.2021.015.016 Abstract ( )   PDF (4747KB) ( )   Aiming at the problem of abnormal pressing noise of automobile interior parts, this paper analyzes that stiffness and friction characteristics are the main causes of abnormal pressing noise. The effects of abnormal pressing noise are analyzed from the material compatibility, parts subdivision and matching form, overall and local stiffness of the parts, and tolerance of the parts. The subjective evaluation method and positive development process of abnormal pressing noise are proposed. In different development stages, the risk of abnormal pressing noise is reduced and the reliability of interior parts is improved through typical section design, installation point and limit structure arrangement, contact point inspection, CAE analysis, and anti-abnormal noise materials. References | Related Articles | Metrics

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Integrated Control of Central Air Conditioning about Circulating Water System Which Based on PLC and Frequency Converter BAI Yin 2021, 46(15): 63-66.  DOI: 10.16638/j.cnki.1671-7988.2021.015.017 Abstract ( )   PDF (1256KB) ( )   By analyzing the limitation and shortage of energy saving in the work of central air conditioning in which two different energy-saving technical schemes are proposed. Such as half frequency conversion scheme and full frequency conversion scheme. After the comparison of energy-saving effect and calculation of power consumption, an ideal scheme is finally determined. Finally, through designing the software, producing human-computer interface and debugging we find that the reliability and economics of the central air conditioning circulating system is obvious. References | Related Articles | Metrics

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The Design of Bolted Joints in Powertrain Mounting System SHAO Wenbin 2021, 46(15): 67-70.  DOI: 10.16638/j.cnki.1671-7988.2021.015.018 Abstract ( )   PDF (977KB) ( )   The powertrain mounting system plays a role in supporting the powertrain on the vehicle, and its reliability has a self-evident impact on the driving safety. The reliability of bolted joints in the mounting system is an important part of the overall reliability of the system. How to avoid the failure of bolted joints is of great significance to improve the reliability of the powertrain mounting system. Starting from the general principle of bolted joints, this paper analyzes the characteristics of bolted joints in the mounting system, and introduces the design requirements and key points of bolted joints in the powertrain mounting system from the number and location of bolts, the selection of bolt specifications, the verification of surface pressure and engagement length of the internal thread, and the determination of tightening torque, forming a relatively complete design process. References | Related Articles | Metrics

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Research on Fatigue Life of Welds of Sub-frame ZHOU Desheng, HU Dongqing, WANG Zhenfeng 2021, 46(15): 71-74.  DOI: 10.16638/j.cnki.1671-7988.2021.015.019 Abstract ( )   PDF (2390KB) ( )   In order to predict the fatigue life of the weld of the sub-frame structure, the fatigue S-N curve of the weld was determined through the bench fatigue test of the fillet welding and lap welding. Then the virtual prototype technology is used to obtain the relative damage ratio between the wheel center load and the original road spectrum load to ensure the accuracy of the multi-body dynamics model. Through the finite element weld fatigue simulation analysis, the location where the fatigue life of the sub-frame weld is the smallest is obtained. Finally, the fatigue test of the vehicle's twenty-four channel bench was carried out. The fatigue life times of the bench and the location of the cracks were consistent with the results of the simulation analysis, which verified the reliability of the weld fatigue S-N curve and the prediction results of the simulation analysis. References | Related Articles | Metrics

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Precision Plug Gauge Measuring System with Gauge DENG Zhenhua 2021, 46(15): 75-78.  DOI: 10.16638/j.cnki.1671-7988.2021.015.020 Abstract ( )   PDF (2557KB) ( )   This paper introduces a kind of precision plug gauge with gauge to solve the problem of measuring inner hole with high tolerance. The structure and advantages of the gauge are described in detail. The process and method of measuring system analysis of linear error, measuring tool capability index Cg/Cgk, repeatability and reproducibility R&R are described. References | Related Articles | Metrics

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Bus Waterway System Layout and Gas Purification Design ZHU Airong 2021, 46(15): 79-81.  DOI: 10.16638/j.cnki.1671-7988.2021.015.021 Abstract ( )   PDF (820KB) ( )   The application of waterway system in passenger cars mainly includes cooling and heating. Aiming at large and medium-sized rear mounted passenger cars, this paper expounds and analyzes the structural layout of waterway system, cooling subsystem and heating subsystem of the whole car, so as to solve the influence of gas generated in the two subsystems on engine cooling and heating efficiency of the car, the corresponding gas purification design schemes are put forward. References | Related Articles | Metrics

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Research on Thermodynamics of Disc Brake Based on ANSYS YANG Xiaona, DING Beibei 2021, 46(15): 82-84.  DOI: 10.16638/j.cnki.1671-7988.2021.015.022 Abstract ( )   PDF (946KB) ( )   The brake is an important part of the car, which plays the functions of deceleration, braking and parking. Disc brakes are widely used in passenger cars and commercial vehicles because of their excellent braking performance. In response to the thermal degradation of braking performance, using ANSYS software, establish a finite element model of the disc brake, based on the theoretical analysis of thermodynamics, conduct thermal-structure coupled analysis, obtain the temperature change diagram of the brake at different braking moments. It is concluded that by optimizing the air duct form of the ventilated brake disc or adding small holes on the brake disc surface, it can improve the heat dissipation problem of the brake disc, and has practical guiding significance for improving the active safety of the car. References | Related Articles | Metrics

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The Research on Method Control Strategy for Improve Truck Operating Stability ZHANG Xu, WANG Yin, LU Wei, WU Xing 2021, 46(15): 85-88.  DOI: 10.16638/j.cnki.1671-7988.2021.015.023 Abstract ( )   PDF (1855KB) ( )   In the process of truck steering due to the centripetal force, lateral and pendulum swing movement, effective active control, can ensure the safety of good vehicle steering. By establishing a two-degree freedom vehicle model, a control method based on PID technology, active model in MATLAB/ SIMULINK, compared with passive model, under different front wheel angle input conditions to verify the effectiveness of the article controller. References | Related Articles | Metrics

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Programming of Body Controller for a Heavy Vehicle Based on Stateflow KANG Ruihang, WANG Yi, HAO Fei, YAN Yu, LIU Qi, ZHANG Xu 2021, 46(15): 89-91.  DOI: 10.16638/j.cnki.1671-7988.2021.015.024 Abstract ( )   PDF (1941KB) ( )   This paper introduces a kind of body controller software design based on stateflow model, which uses Stateflow model to realize the application layer logic of each load module. Stateflow model can verify the correctness of logic by executing simulation, can synchronize with hardware design, save software development time, and generate. C and. H code for different microcontrollers by setting compiler. Block diagram design, intuitive and conducive to later maintenance. References | Related Articles | Metrics

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Lightweight Lamination Design of Carbon Fiber Hood WANG Yunhui, LUO Maokang, MO Guiwen 2021, 46(15): 92-94.  DOI: 10.16638/j.cnki.1671-7988.2021.015.025 Abstract ( )   PDF (1252KB) ( )   The carbon fiber hood was designed for an MPV, and its finite element analysis model was established by HyperMesh. The full-factor DOE experiment design and multi-objective optimization were carried out by Isight, and the optimal sequence of carbon fiber lamination was determined.The simulation results show that, compared with the traditional steel hair hood, the total weight of the hair hood is reduced by 44.9%, and the torsion stiffness of the hair hood is increased by 35%, the lateral stiffness displacement is reduced by 10.6%, the lock hook stiffness displacement is reduced by 27.4%, the gap interval difference is reduced by 55.4%, the wing tip stiffness displacement is reduced by 30.1%, and the first-order constraint mode frequency is increased by 43.3%. References | Related Articles | Metrics

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Closed Loop Control and Simulation of Solenoid Valve Current Based on Predictive Algorithm WANG Jianjun, YANG Jia, LI Rui 2021, 46(15): 95-97.  DOI: 10.16638/j.cnki.1671-7988.2021.015.026 Abstract ( )   PDF (1778KB) ( )   In this paper, the traditional current closed-loop PID control of solenoid valve is analyzed, and a current closed-loop control method of solenoid valve based on predictive algorithm is proposed, which is verified by simulation in Simulink environment. The simulation results show that this control method can improve the dynamic response speed of solenoid valve control and optimize the effect of traditional solenoid valve current closed-loop PID control. References | Related Articles | Metrics

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Analysis and Optimization of Abnormal Noise of Rear Shock Absorber of a Vehicle DING Dudu, LUO Xiepan, LI Yibao, CUI Hongliang 2021, 46(15): 98-100.  DOI: 10.16638/j.cnki.1671-7988.2021.015.027 Abstract ( )   PDF (3192KB) ( )   In view of the problem of rear suspension abnormal noise of a vehicle under the condition of twisted road, through the test of objective data, the vibration amplitude of the upper eye, mounting bolt and body position on the rear shock absorber is the highest. After disassembled and analysised, the abnormal noise is caused by out of tolerance of piston face size of shock absorber and plane welding slag of body screw sleeve. Finally, the welding process of piston mould and body bolt pipe is optimized to solve the problem. References | Related Articles | Metrics

Testing and Experiment

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Dynamic Response Analysis of Train Oblique Impact on Rigid Obstacle XING Yi, JIN Minjie, FAN Ying 2021, 46(15): 101-104.  DOI: 10.16638/j.cnki.1671-7988.2021.015.028 Abstract ( )   PDF (1517KB) ( )   According to the structure and operation conditions of metro train, the finite element model of metro train collision is established. Through the nonlinear finite element software LS-DYNA, the oblique impact dynamic response between the train and the rigid obstacle under a large angle (25 °) is analyzed from the aspects of the structural deformation of the end of the train, the energy absorption of each part of the train, the acceleration of the train and the displacement response of the bogie wheel. References | Related Articles | Metrics

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Influence of Mechanical Characteristics of Hydraulic Bushing on Vehicle Transmission Characteristics YAN Dongwang, TIAN Guohong, QIN Yuying 2021, 46(15): 105-107.  DOI: 10.16638/j.cnki.1671-7988.2021.015.029 Abstract ( )   PDF (1265KB) ( )   According to the characteristic that the hydraulic bushing can provide large stiffness and damping under the condition of low frequency and high amplitude vibration, this paper establishes a seven degree of freedom model including hydraulic bushing mechanics based on the classical seven degree of freedom vibration model based on Matlab software, and introduces the transmission characteristics. Finally, by comparing the body vertical acceleration power spectral density curve and tire dynamic load of the two models, the results show that the seven degree of freedom model with hydraulic bushing can describe the vehicle vibration transmission characteristics more accurately. References | Related Articles | Metrics

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Statics Simulation Analysis Based on a Light Truck Gearbox REN Jiesi 2021, 46(15): 108-112.  DOI: 10.16638/j.cnki.1671-7988.2021.015.030 Abstract ( )   PDF (2681KB) ( )   According to the statistical analysis of common working conditions of light trucks, in some light truck transmis -sions, the most likely to have stress concentration or often work under low speed, high torque, heavy load and high temperature environment is very high. This working state usually happened in first gear. Therefore, it is necessary to carry out force analysis and theoretical calculations based on the gear and transmission shaft for the first gear of the transmission, the housing, and the assembly. The force value is used as the loading load and the transmission shaft and housing are statically analyzed to find out the maximum stress value and the maximum strain value of the stress concentration positions everywhere provide optimization suggestions for the optimization of the later transmission structure. References | Related Articles | Metrics

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The Modal Analysis of Passenger Car Sub-frame Based on ABAQUS Software WEI Youchao, ZHOU Lei, ZHOU Si, PAN Song 2021, 46(15): 113-116.  DOI: 10.16638/j.cnki.1671-7988.2021.015.031 Abstract ( )   PDF (3995KB) ( )   Because the front sub frame is connected with the engine through the engine rear mount, in the design should not only consider the strength, at the same time, in order to avoid the vibration amplification and noise, improve the performance of NVH, must made modal characteristics as necessary constraints on the front sub frame design, to avoid the vibration frequency of engine in different revolving speeds (midband: 25 Hz~400 Hz), and to avoid the driving frequency of the road (low frequency band:<25 Hz). In this paper use front sub frame of a new MPV as an example, using finite element software ABAQUS to analysis the mode of front sub frame, and combined with the test data to verify the accuracy of the CAE model, provide the CAE analysis basis for the design and improvement of the front sub frame. References | Related Articles | Metrics

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Research on the Calculation Method of Sprinkler Performance of Street Sprinkler JIANG Wei, LI Ming, BAI Zilong 2021, 46(15): 117-120.  DOI: 10.16638/j.cnki.1671-7988.2021.015.032 Abstract ( )   PDF (2877KB) ( )   Based on the analysis of the H-Q characteristics of the sprinkler pump, the pressure loss of the pipeline and the flow characteristics at the outlet of the sprinkler, the calculation method of the sprinkler performance is established by combining the hydrodynamics theory and parabolic motion theory. By comparing with the experimental data, it is verified that the calculation method of sprinkler performance established in this paper has high accuracy, and has a certain practical engineering application value. References | Related Articles | Metrics

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Analysis and Simulation of Power Assisted Characteristics of Automobile Electric Power Steering System YU Fajia 2021, 46(15): 121-123.  DOI: 10.16638/j.cnki.1671-7988.2021.015.033 Abstract ( )   PDF (1400KB) ( )   This paper studies the assist characteristics and simulation of electric power steering system, which provides theoretical basis and design method for the design and development of electric power steering system. Based on the comparison and analysis of linear, zigzag and curvilinear assist characteristic curves, the power assist control strategy of EPS system based on fuzzy control is proposed, and the three-dimensional atlas of EPS power curve under different vehicle speed and steering wheel torque input is obtained. The three-dimensional atlas of EPS power curve shows that the power assistance control strategy based on fuzzy control is in line with the actual EPS system's assistance in the steering process requirements. References | Related Articles | Metrics

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Influence of Heavy Commercial Vehicle Engine Fan on Heat Dissipation of Air Conditioning Condenser CHEN Bing 2021, 46(15): 124-127.  DOI: 10.16638/j.cnki.1671-7988.2021.015.034 Abstract ( )   PDF (2460KB) ( )   The air-conditioning condenser of heavy commercial vehicle is integrated with front-end cooling, arranged in front of the engine, and its heat dissipation is affected by the engine fan, at the same time, it analyzes the response mechanism of the main current SCR fan, and provides the matching method for the whole vehicle air conditioning system. References | Related Articles | Metrics

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Simulation Analysis of the Influence of Spoiler on Drag Coefficient of a Sports Car Based on FLUENT TIAN Hui, ZHANG Zuosen, ZHANG Yuling 2021, 46(15): 128-130.  DOI: 10.16638/j.cnki.1671-7988.2021.015.035 Abstract ( )   PDF (3247KB) ( )   With the rapid development of computer technology, computational fluid dynamics (CFD) theory has been widely used in the process of automobile design and development. Based on the theory of computational fluid dynamics, this paper takes a sports car model as the research object, uses ANSA software for geometric cleaning and meshing, FLUENT software to solve the calculation of drag coefficient, and CFD-POST software to extract velocity vector diagram and pressure nephogram. Through simulation calculation, the different drag coefficients of the original model and a sports car model with different angle spoiler are obtained. At the same time, the causes of different drag coefficients are analyzed. The main reason for the different drag coefficients is that the existence of the spoiler delays the smooth convergence of the two airflow at the rear of the vehicle, resulting in the formation of a vortex area behind the spoiler at the rear of the vehicle. The larger the angle of the spoiler is, the larger the vortex area at the rear of the vehicle is, and the greater the drag coefficient is. References | Related Articles | Metrics

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Simulation Analysis Method of Ball Joint Assembly for Vehicle YU Dongna, TIAN Chong, E Shiguo 2021, 46(15): 131-134.  DOI: 10.16638/j.cnki.1671-7988.2021.015.036 Abstract ( )   PDF (2409KB) ( )   Ball joint assembly has been widely used in the important parts of cars, in order to ensure the mechanical safety performance of ball joint assembly structure, according to the bench test items, the finite element simulation analysis method based on tribology mechanism is adopted to calculate the axial crushing strength, assembly static strength and fatigue life. Basically, a simulation analysis method be summarized which to verify the mechanical safety performance of ball joint assembly structure. References | Related Articles | Metrics

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Investigation of Global Optimization Energy Management Strategy of PHEV Based on PMP LI Jiacheng 2021, 46(15): 135-137.  DOI: 10.16638/j.cnki.1671-7988.2021.015.037 Abstract ( )   PDF (1597KB) ( )   Dynamic programming is often used to find the global optimal solution for known operating conditions, but this method requires a large amount of calculation and takes a long time to solve. In this paper, in order to solve this problem, the generator set and battery pack model are appropriately simplified, and the battery pack state of charge is state variables, the output power of the battery pack is used as the control variable, and the Pontryagin minimum principle is used to solve the energy management problem of hybrid electric vehicles, and the global optimal solution is obtained. Compared with dynamic programming, the time performance of this method is raised dramatically. References | Related Articles | Metrics

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Optimal Analysis of Longitudinal Flexibility of a Certain Vehicle Type WANG Hai, LIU Tong, LIU Yanhua 2021, 46(15): 138-140.  DOI: 10.16638/j.cnki.1671-7988.2021.015.038 Abstract ( )   PDF (1886KB) ( )   In the process of adjusting a vehicle, the adjusting engineer found that the vibration response of the vehicle was obvious, the impact was large and the ride comfort was poor in the acceleration, braking and over-deceleration conditions. This paper analyzed the above problems. Firstly, the DOE of ride comfort is analyzed by using Adams/insight software, and the factors affecting ride comfort performance are analyzed, and the factors affecting ride comfort are confirmed. Secondly, the influencing factors are evaluated and analyzed to determine the optimal ride comfort scheme. Finally, the optimization scheme is analyzed, in order to determine the feasibility of the final optimization scheme. References | Related Articles | Metrics

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Research the Position Design of the McPherson Suspension Anti-Roll Bar's Linkage on the Steering Performance WANG Wenyuan, LIN Youbin, DENG Zuping 2021, 46(15): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2021.015.039 Abstract ( )   PDF (2079KB) ( )   In the article, the interference of steering torque which produced by the McPherson suspension Anti-Roll bar's linkage has been analyzed, the conception of equivalent steering arm is introduced to quantitatively analyze the influence. By setting the different position of the Anti-Roll bar's linkage, the effects of different equivalent steering arm values on the suspension wheel jump steering performance and the vehicle dynamic steering characteristics are compared and analyzed. After collecting the statistical analysis of the equivalent steering arm value of several front McPherson Anti-Roll bar's linkages, recommend the reasonable equivalent steering arm value for vehicle, provide an effective data for guiding the suspension Anti-Roll bar design. References | Related Articles | Metrics

Process and Equipment

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Failure Analysis and Improvement of Wet Multi-disc Brake for Port AGV HE Shouxun, LI Qing, LIU Zongqiang 2021, 46(15): 145-147.  DOI: 10.16638/j.cnki.1671-7988.2021.015.040 Abstract ( )   PDF (3018KB) ( )   In order to solve the problem of oil string and oil leakage of wet multi-disc brake used in port AGV, the piston seal structure was studied, analyzed and improved in depth. The optimal solution was determined by comparing and verifying the three sealing structure schemes. In addition, related design and process requirements are controlled to provide a reference for the development and application of new product projects in the future. References | Related Articles | Metrics

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Study on Carbide Removal Process of Meshing Sleeve Surface QIN Pengtao, DING Fuming, WANG Junjie, MOU Hailong 2021, 46(15): 148-151.  DOI: 10.16638/j.cnki.1671-7988.2021.015.041 Abstract ( )   PDF (4253KB) ( )   20CrMnTi carburized with furnace cooling to 815 ℃ furnace quenching directly, the surface carbide level is poor, does not meet the process requirements, through theoretical analysis, because of the high carbon potential in the furnace led to carbide level is poor. According to the method of eliminating carbides, different process test methods are developed. Finally, a reasonable elimination process scheme is developed through the comparison and analysis of test results. References | Related Articles | Metrics

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A Brief Introduction of the Analysis Method for Fuel Cap Flush Issue of New Model WU Li, WU Huanhui, LI Rong, LI Xiaochun, LIAO Xingtao 2021, 46(15): 152-155.  DOI: 10.16638/j.cnki.1671-7988.2021.015.042 Abstract ( )   PDF (2570KB) ( )   According to the new model filler cap and side surface difference problem instance analysis, fishbone diagram analysis of the filler cap and the influence factors of side face bad problems around, through analyze to determine the cross reinforcement filler cap in the assembly process and side mounting holes around the scraped material piling as the main influence factors, and formulate the corresponding countermeasures for validation, by PDCA cycle to determine the ultimate countermeasure, at the same time, sum up experience form analytical database in order to better guide subsequent parsing models quality problem. References | Related Articles | Metrics

Use and Maintenance

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Discussion on Fault Diagnosis and Maintenance Technology of Automobile Electronic Control Engine System ZENG Xi, ZOU Yifu 2021, 46(15): 156-157.  DOI: 10.16638/j.cnki.1671-7988.2021.015.043 Abstract ( )   PDF (1016KB) ( )   With the advancement of social modernization and the significant improvement of living standards, people's demand for automobiles has greatly increased, thus promoting the rapid development of the automobile industry. Because the failure of the automobile electronic control engine system will have a greater impact on the overall performance of the automobile, our automobile industry needs to pay attention to its related problems. This article will discuss the fault diagnosis and maintenance technology of automobile electronic control engine system, hoping to provide valuable reference for related research. References | Related Articles | Metrics

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Early Failure Analysis and Improvement of Driver's Seat XIA Pan, ZHANG Xinjie, CHEN Weiwei 2021, 46(15): 158-160.  DOI: 10.16638/j.cnki.1671-7988.2021.015.044 Abstract ( )   PDF (2805KB) ( )   This paper introduces the main components and functions of the car seat, analyzes the main reasons for the early failure of the driver's seat, and gives the solution. The implementation of the solution can effectively reduce the early failure efficiency of the seat and improve the reliability of the seat. References | Related Articles | Metrics

Automobile Education

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Research on the Teaching Reform of Course Identification and Evaluation of Used Motor Vehicles under the Background of "1+X" Certificate System CHEN Hai, JIANG Younong 2021, 46(15): 161-163.  DOI: 10.16638/j.cnki.1671-7988.2021.015.045 Abstract ( )   PDF (1104KB) ( )   Aiming to improve the teaching effect, combining with the implementation plan of national vocational education reform and the requirements of "1+X" certificate system, starting from the curriculum teaching reform, this paper discusses the teaching reform plan of course Identification and Evaluation of Used Motor Vehicles from the aspects of classroom design, resource construction, teaching reform and documentary evidence integration. It is necessary to do such research because more skilled talents meeting the needs of the society are expected to be trained from higher vocational colleges. References | Related Articles | Metrics

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Exploration and Practice of "School-Enterprise Double-Main-Body" Training Mode for Automobile Talents in Local Universities MA Hongxin, ZHU Hengwei, SHI Zhenping 2021, 46(15): 164-166.  DOI: 10.16638/j.cnki.1671-7988.2021.015.046 Abstract ( )   PDF (979KB) ( )   According to the current situation of professional personnel training and the characteristics of the actual demand of enterprises, this paper puts forward the training mode of "school-enterprise double-main-body" for the talents of automobile specialty in local universities, this paper probes into the problems of training objective, scheme making, teachers commu -nication and idea coordination in the double-main-body training mode of school and enterprise, it is pointed out that the establishment of the principal position of enterprise talents training, the two-way communication between school and enterprise, the deep integration of production and teaching, and the strengthening of the construction of the teaching staff are the effective ways to cultivate the applied and innovative talents, which are of great practical significance. References | Related Articles | Metrics

Standards Regulations Management

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Automate Release Management of Configurable Interior Color Part WANG Lianqing, WANG Tao, ZHANG Guanhua 2021, 46(15): 167-172.  DOI: 10.16638/j.cnki.1671-7988.2021.015.047 Abstract ( )   PDF (2143KB) ( )   To meet the high customized requirement of vehicle interior style, it's necessary to apply a efficient management method of product data for interior color part release in vehicle development BOM. A automate release management method of configurable interior color part is studied in this paper. The basic definition, digital programme of configurable color scheme and creation of color part in BOM are discussed in this paper. Finally, the benefits of this method to modular development are concluded. References | Related Articles | Metrics

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Application of Original Price Technology in New Energy Vehicle Development LI Qingli 2021, 46(15): 173-176.  DOI: 10.16638/j.cnki.1671-7988.2021.015.048 Abstract ( )   PDF (1066KB) ( )   According to the new energy vehicle industry development plan, the sales volume of new energy vehicles in China will reach 25% in 2025. Developing new energy vehicles is the only way for China from a big automobile country to a powerful automobile country. In the context of the national new energy vehicle strategy, based on the concept of "original price planning", with the goal of controlling the design cost of new products, relying on the original price technology management tools, the original cost model for parts can be established, which can refine the cost calculation regularly. Practice shows that original price technology is a powerful tool in the development of new energy vehicles. References | Related Articles | Metrics

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Analysis of Policies and Standards for Recycling and Utilization of Vehicle Power Batteries GUO Yuan, QI Chunyu 2021, 46(15): 177-180.  DOI: 10.16638/j.cnki.1671-7988.2021.015.049 Abstract ( )   PDF (2955KB) ( )   As the number of retired power batteries of new energy vehicles continues to increase, the power battery recycling industry has entered a stage of large-scale development. Through combing and analyzing the power battery recycling policies and standards, it is found that the industry has gradually increasing demand for the standardized development of power battery recycling. At present, the regulatory policies for the recycling of decommissioned power batteries have been promulgated one after another, and the requirements for recycling companies are being supplemented and improved, and the related responsibilities of enterprises in all links of the industrial chain are gradually clarified. At the same time, the development of power battery recycling standards has accelerated, and the battery recycling standards in related sub-fields will be gradually expanded in the future, further promoting the standardized development of the industry. References | Related Articles | Metrics

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Automotive Research and Development Project Risk Management Application and Tools LI Hongxin, RUAN Xiaoming 2021, 46(15): 181-183.  DOI: 10.16638/j.cnki.1671-7988.2021.015.050 Abstract ( )   PDF (1401KB) ( )   This article mainly elaborates the project risk management about cars, as well as the risk of a few big process are summarized, focusing on the classification of risk and risk tool is introduced, the project manager to have a preliminary understanding of risk and understand, and can be used in automobile research and development program simple risk management tools, make the project in accordance with the requirements of the company, with good quality, on time delivery. References | Related Articles | Metrics

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Discussion on Horizontal Evaluation Standard of Braking Performance in Commodity Evaluation TAO Yingchao 2021, 46(15): 184-186.  DOI: 10.16638/j.cnki.1671-7988.2021.015.051 Abstract ( )   PDF (1178KB) ( )   In order to improve the satisfaction of end customers on the performance of purchased cars, automobile OEMs will generally conduct commercial evaluation on the whole vehicle before mass production of newly developed products. Combined with the overall situation of competing products and benchmark models, they will try their best to find problems and optimize the design in time, so as to avoid the problems entering the market and causing customer complaints. Therefore, this paper mainly from the static and dynamic, according to different speed, weather conditions and road conditions to carry out the transverse evaluation of the braking performance, and finally form a more complete set of commercial automotive braking performance criterion, to provide reference for the daily evaluation work. References | Related Articles | Metrics

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Research on Carbon Emission Accounting Technology of Component Life Cycle XU Jiaming, GONG Junchuan 2021, 46(15): 187-190.  DOI: 10.16638/j.cnki.1671-7988.2021.015.052 Abstract ( )   PDF (1723KB) ( )   The component LCA analysis can calculate the carbon emission in the life cycle of a single component, analyze and compare the carbon emission value of different parts or suppliers through the unified carbon emission accounting standard, so as to identify the carbon emission of the parts, and thus propose the energy saving and consumption reduction plan for the vehicle. References | Related Articles | Metrics

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Research on Quality Control of Automotive Product Design and Verification QIU Chuixiang 2021, 46(15): 191-194.  DOI: 10.16638/j.cnki.1671-7988.2021.015.053 Abstract ( )   PDF (1398KB) ( )   Development of automobiles is a systematic project. The inherent quality of the products is strongly related to the way of development and verification management. Decent products come from rigid quality control during the design and development process. In current study, an idea of automobile product development and quality control is introduced, in which the principal elements of design, development and quality control are discussed to improve the quality of products. By monitoring the key points in the design and development stage, the quality of products can be effectively improved. References | Related Articles | Metrics

Overview

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Discussion on Regenerative Braking Energy Recovery Technology of Electric Vehicle LIU Chunhui, ZHANG Kun 2021, 46(15): 195-197.  DOI: 10.16638/j.cnki.1671-7988.2021.015.054 Abstract ( )   PDF (893KB) ( )   In this paper, the principle of braking energy recovery is introduced in detail. Aiming at the existing problems of braking energy recovery, the best strategy of braking energy recovery is found out in order to improve the efficiency of braking energy recovery. However, due to the limited conditions of braking energy recovery, the recovery of braking energy on this basis is our research topic. With the increasing attention to energy conservation and environmental protection, the regenerative braking energy recovery efficiency will be greatly improved, and the electric vehicle technology will make a major breakthrough. In the near future, electric vehicles will replace fuel vehicles and become the mainstream of urban transportation. References | Related Articles | Metrics

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Application of Newness Rate in Used Car Evaluation Based on Replacement Cost Method CHENG Xiaojun 2021, 46(15): 198-201.  DOI: 10.16638/j.cnki.1671-7988.2021.015.055 Abstract ( )   PDF (1370KB) ( )   In recent years, the domestic used car trading volume has exceeded 10 million. In the process of used car consumption, we need to evaluate the value of used car scientifically and effectively. In this paper, combined with the domestic used car market, based on the replacement cost method, the influencing factors of the newness rate are weighted to get the comprehensive newness rate. At the same time, other factors that affect the newness rate are included in the adjustment coefficient for comprehensive evaluation, so as to make a comprehensive evaluation of used cars. References | Related Articles | Metrics

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The Influence of Exhaust Gas Turbocharged on the System Structure of Electronic Control Gasoline Engine ZHANG Xianhui 2021, 46(15): 202-205.  DOI: 10.16638/j.cnki.1671-7988.2021.015.056 Abstract ( )   PDF (4100KB) ( )   The application of exhaust gas turbocharged technology improves the intake efficiency and power performance of electronic control gasoline engine, at the same time, it forces the relevant system of engine to make necessary changes in structure and function. In this paper, the differences of structure and function between natural aspirated engine and turbocharged engine in intake, exhaust, cooling, lubrication, PCV, EGR, EVAP and other relative systems are described, thus, it provides necessary guidance for the maintenance and repair of electronic control gasoline engine. References | Related Articles | Metrics

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Research on Remote Monitoring and Fault Diagnosis System of Motor Vehicle Inspection Line ZHONG Zhiyong 2021, 46(15): 206-208.  DOI: 10.16638/j.cnki.1671-7988.2021.015.057 Abstract ( )   PDF (1108KB) ( )   The article mainly studies the remote monitoring and fault diagnosis system of the motor vehicle detection line, and discusses the user experience optimization measures of the remote monitoring and fault diagnosis system of the motor vehicle detection line. The purpose is to ensure the normal operation of the detection line, and find the cause and take measures in time when problems occur. References | Related Articles | Metrics

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Study on Influencing Factors of Yield Extensibility for Modified Polypropylene ZHANG Quan 2021, 46(15): 209-212.  DOI: 10.16638/j.cnki.1671-7988.2021.015.058 Abstract ( )   PDF (4728KB) ( )   The effects of PP resin, talc mesh and content, POE and HDPE on yield extensibility of modified polypropylene were studied. The results show that the yield extensibility of modified polypropylene is related to the stress concentration. The more the stress concentration points in the system, the lower the yield extensibility. For the fixed formulation system, the yield extensibility of PP increased with the decrease of melt flow rate; with the increase of talc mesh, the yield extensibility of the material decreases, and with the decrease of talc content, the yield extensibility increases; with the increase of POE melt index, the yield extensibility increases gradually; a small amount of HDPE can lead to a significant increase in yield extensibility. It was found that the improvement of rubber dispersion was beneficial to the increase of yield extensibility in the fixed formulation system, and the effect of yield extensibility on brittle-ductile transition was verified by modification technology and formulation design. References | Related Articles | Metrics

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Research on Ahead Vehicle Recognition of ADAS Based on Multi-sensor Fusion ZHANG Bosen, CHEN Xuewen 2021, 46(15): 213-214.  DOI: 10.16638/j.cnki.1671-7988.2021.015.059 Abstract ( )   PDF (938KB) ( )   The research of environment awareness module in advanced driving assistance system is an important step in the development of intelligent vehicle. Environmental awareness system based on a single type of sensor has disadvantages due to the characteristics of the sensor. We have done in-depth research on various on-board sensors used for front-vehicle identification, sorted out their advantages and disadvantages, referred to a large number of relevant literatures, and the domestic and foreign mainstream research methods have been reviewed. It is inferred that the target information detected by fusion camera and millimeter-wave radar is an effective means of front vehicle identification at the present stage, and a reasonable fusion scheme is proposed. References | Related Articles | Metrics

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Brief Introduction to Alternative Fuel for Automobile Engine DANG Jinjin, WANG Longlong 2021, 46(15): 215-217.  DOI: 10.16638/j.cnki.1671-7988.2021.015.060 Abstract ( )   PDF (1064KB) ( )   The article mainly studied the characteristics of alcohols, natural gas, dimethyl ether, and hydrogen. And compr -ehensively analyzed the advantages and disadvantages of various alternative fuels when used in vehicle engines. The results showed that methanol and dimethyl ether have the advantages of mature technology and high production efficiency. Dimethyl ether still needs a lot of experimental research work in technology. The use of hydrogen in engines is relatively mature, but its combustion needs to be studied. References | Related Articles | Metrics

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Countermeasures for the Development of New Energy Automobile Industry in China under the Low-Carbon Economy CHEN Zhen, YANG Lijun 2021, 46(15): 218-220.  DOI: 10.16638/j.cnki.1671-7988.2021.015.061 Abstract ( )   PDF (983KB) ( )   In order to strengthen the competitive advantage of China's new energy vehicles in the domestic and international market, the article combined with the current problems faced by new energy vehicles, conducted research from the aspects of innovative technology, developing the market, improving the corresponding measures and industrial chain, and promoted the new development of new energy vehicles in China. References | Related Articles | Metrics