Archive

15 July 2023, Volume 48 Issue 13 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Use and Maintenance
Use and Maintenace
Automobile Education
Standards·Regulations·Management


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New Energy Vehicle

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Research on Pump Control Strategy of Battery Thermal Management System for Electric Vehicle ZHU Bo 2023, 48(13): 1-8.  DOI: 10.16638/j.cnki.1671-7988.2023.013.001 Abstract ( )   PDF (1493KB) ( )   In order to improve the control effect of battery thermal management system without significantly increasing energy consumption, the adaptive control strategy of pump in battery thermal management system for electric vehicle is studied in this paper. Using the design of experiments method, the simulation is carried out based on the full factor design of experiments method. The influence of the pump flow on the battery temperature at the termination time at different vehicle speeds and initial battery temperatures is statistically analyzed, and the optimal flow distribution diagram is obtained. Thus, the pump flow adaptive control strategy is proposed. Finally, the simulation is carried out under typical driving cycles such as new European driving cycle (NEDC) and world light vehicle test cycle (WLTC). The results show that compared with the constant flow control strategy, the adaptive flow control strategy can effectively ensure the control effect of the battery thermal management system. References | Related Articles | Metrics

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Electric Vehicle Output Torque Control Method Based on Environmental Compensation WANG Jing 2023, 48(13): 9-13.  DOI: 10.16638/j.cnki.1671-7988.2023.013.002 Abstract ( )   PDF (661KB) ( )   A method for controlling the output torque of electric vehicles based on environmental compensation is proposed in this paper. Firstly, the concept of environmental impact parameters of electric vehicles is defined to realize the quantitative evaluation of the influence of environmental factors on the driving process. On this basis, an electric vehicle based on radial basis function (RBF) neural network is proposed. The environmental impact parameter calculation method uses the powerful nonlinear problem solving ability of neural network to solve the vehicle environmental impact parameters that conventional mathematical methods cannot do; finally, the environmental impact parameters calculated by the RBF neural network are used to compensate the output torque command of the drive motor. In order to ensure that the final output torque of the drive system is not affected by the environment as much as possible, the driving experience of the driver is improved. A MATLAB/Simulink model is established for the proposed control method, and the feasibility and effectiveness of the method are verified by simulation. References | Related Articles | Metrics

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Current Situation and Countermeasures of Hydrogen Fuel Cell Vehicle Technology CHEN Lei 2023, 48(13): 14-19.  DOI: 10.16638/j.cnki.1671-7988.2023.013.003 Abstract ( )   PDF (783KB) ( )   With the rapid development of hydrogen energy industry, hydrogen fuel cell vehicles have become the focus of the world. Through bibliometrics and policy tools, the main contents, bottlenecks and future development trends of hydrogen fuel cell vehicle technology are analyzed. It can be found that China has certain gaps with foreign countries in the fields of catalysts, high pressure hydrogen storage bottles, air compressors, gaseous diffusion layer materials, sealant materials, some achievements have been made in the fields of proton exchange membrane, graphite bipolar plate, hydrogen fuel cell reactor and system development and manufacturing, finally, the paper puts forward countermeasures and suggestions from the aspects of policy support, industrial layout, technology research and development, platform construction and talent training. References | Related Articles | Metrics

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Improved Lightweight Design of Mixed-Gas Reinforced Cylinder Pad DUAN Xinlu 2023, 48(13): 20-27.  DOI: 10.16638/j.cnki.1671-7988.2023.013.004 Abstract ( )   PDF (3114KB) ( )   In order to promote the use of methanol fuel in gasoline engine, by changing the cylinder pad of 18K4G gasoline engine to the reinforced cylinder pad with local holes, the ignition work of methanol fuel mixture can be strengthened. Using CATIA software to build the three-dimensional model of the cylinder cushion, and using ANSYS software to simulate and analyze the statics, mode, transient dynamics and life of the cylinder cushion, the structure is lightened with the thickness of different parts of the cylinder cushion as a variable. The results show that the mass of the gasket is reduced by 5.6%, which lays a foundation for the further study of the new structure of gasket. References | Related Articles | Metrics

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Analysis and Solution of Water Flooding Problem in Proton Exchange Membrane Fuel Cells REN Qiang 2023, 48(13): 28-33.  DOI: 10.16638/j.cnki.1671-7988.2023.013.005 Abstract ( )   PDF (1224KB) ( )   Proton exchange membrane fuel cell generates electricity, water and heat through electrochemical reaction of hydrogen and oxygen. When the water content of proton exchange membrane, cathode and anode is appropriate and evenly distributed, the fuel cell has high power generation performance. However, if water accumulates at the cathode and cannot be discharged in time, it will cause "water flooding". It will lead to the performance degradation and even shutdown of the stack. This paper deduces the law of water content in the cathode according to the water transmission mechanism inside the fuel cell, and finds out the factors that affect the water content in the stack, so as to obtain the optimization scheme to solve the "water flooding" problem. The feasibility and effectiveness of the optimization scheme are verified through the test and actual measurement, and finally the "water flooding" problem of the fuel cell cathode is solved. References | Related Articles | Metrics

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Plug-in Hybrid Electric Buses Energy Management Strategies Based on Carbon Emissions ZHU Jiangjun 2023, 48(13): 34-37.  DOI: 10.16638/j.cnki.1671-7988.2023.013.006 Abstract ( )   PDF (1027KB) ( )   Taking plug-in hybrid electric buses (PHEB) as the research object, this paper establishes a PHEV equivalent carbon emission model. Based on the pontriagin’s minimum principle (PMP), considering the energy consumption and equivalent carbon emissions of vehicle operation, a global optimal energy management strategy is proposed, and the objective function is solved by the target method. Through simulation analysis, the optimal power distribution and optimal compre- hensive cost are obtained: natural gas consumption per 100 km is 10.33 m 3 , electricity consumption is 49.17 kWh, equivalent carbon emissions are 53.56 kgCO2e, and the comprehensive cost per 100 km is ￥104.33. References | Related Articles | Metrics

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Optimization Analysis of High Voltage Electrical Architecture of Pure Electric Vehicle CHEN Gang 2023, 48(13): 38-41.  DOI: 10.16638/j.cnki.1671-7988.2023.013.007 Abstract ( )   PDF (1045KB) ( )   High voltage electrical architecture design of pure electric vehicles has an important impact on the cost, safety and reliability of electric vehicles. The performance parameters of highvoltage electrical components are determined based on the performance requirements of the vehicle. In order to meet the functional requirements and safety requirements of the vehicle, the independent high-voltage electrical architecture and the integrated design high-voltage electrical architecture are compared and analyzed. It is concluded that the integrated design high-voltage electrical architecture can reduce the use of high-voltage connectors, wires, relays, fuses and other electrical components, thus reducing the cost. It is beneficial to the optimization of vehicle layout space and lightweight design of high-voltage electrical components. References | Related Articles | Metrics

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A Heavy Commercial Vehicles Lightweight Design Research in Electrical Module LIU Hongmei 2023, 48(13): 42-45.  DOI: 10.16638/j.cnki.1671-7988.2023.013.008 Abstract ( )   PDF (1411KB) ( )   Battery-swap is the roadmap of new energy heavy-duty commercial vehicles. The structural design and lightweight of battery-swap module is a very important part of the current vehicle design. Based on the worst cases of battery-swap module of a heavy commercial vehicle, the module frame structure topology optimization and size optimization are carried out to achieve lightweight. It is found that the strength fatigue performance after optimization is significantly improved, and the weight is reduced by 11.6%. Compared to the mainstream competitive products in the market, the strength fatigue performance of is evaluated, and the results so that the optimized scheme is also better than the competitive products. Therefore, by the use of finite element evaluation and scheme optimization, the performance of the battery-swap module architecture meets the design requirements, realize the lightweight and cost reduction, it also provides a reference for the battery-swap module design of other similar models. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Analysis of Vehicle Lane Change Trajectory Planning Based on Fuzzy Variable Weights WANG Jiangwu 2023, 48(13): 46-50.  DOI: 10.16638/j.cnki.1671-7988.2023.013.009 Abstract ( )   PDF (1094KB) ( )   Vehicle lane change is a common traffic scene, this paper obtains the trajectory of autonomous vehicles based on five polynomials, and uses a fuzzy controller to dynamically adjust the weight coefficient of the evaluation function, so as to select the optimal trajectory according to the actual conditions. The simulation results show that compare with the traditional fixed weight coefficient trajectory planning method, under the working conditions with a large collision risk, the trajectory planning based on fuzzy change can be reasonably adjuste to adjust the weight vertical safety, planning a reasonable change trajectory with higher efficiency and smaller collision risks to adapt to the current conditions. References | Related Articles | Metrics

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Research on Lateral Control Algorithm of Autonomous Vehicle SUN Feiyu 2023, 48(13): 51-55.  DOI: 10.16638/j.cnki.1671-7988.2023.013.010 Abstract ( )   PDF (1285KB) ( )   Lateral control of autonomous vehicle is the key factor to achieve stable and accurate driving, and its lateral control will directly affect the quality Path tracking effect. This paper will focus on the lateral control problem, based on the vehicle dynamics and kinematics model, combined with the control objective of the special select appropriate input and output and state quantity, build prediction model, and complete algorithm derivation. Connect Simlink to CarSim combined with the simulation platform, the horizontal model predictive control algorithm is co-simulated and analyzed. Finally, the modified Chinese V3 car as a test the platform, the real vehicle verifies the feasibility of the horizontal control algorithm designed in this paper, analyzes the driving state results of the test vehicle, horizontal control the algorithm can realize the stability and accuracy of the lateral control of the autonomous vehicle. References | Related Articles | Metrics

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Analysis of Intelligent Vehicle Path Tracking Based on Variable Sampling Period MPC YANG Zhengyan 2023, 48(13): 56-63.  DOI: 10.16638/j.cnki.1671-7988.2023.013.011 Abstract ( )   PDF (1638KB) ( )   Through the establishment of vehicle dynamics model, considering the sampling period influence on trajectory tracking precision and real time performance, respectively by path curvature and vehicle state parameter for the sampling period judgement conditions for simulation analysis, the final design to redundant state parameter for the switching condition of adaptive variable sampling period model predictive control (MPC) path tracking controller. Simulation results show that compared with MPC controller with fixed sampling period, the MPC controller with adaptive sampling period based on redundant state conditions has good real time performance and tracking accuracy in path tracking. References | Related Articles | Metrics

Design and Research

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Design and Ultimate Bearing Capacity Analysis of Double Torsionbars for Vehicle LI Rongjia 2023, 48(13): 64-68.  DOI: 10.16638/j.cnki.1671-7988.2023.013.012 Abstract ( )   PDF (2007KB) ( )   In order to improve the bearing capacity of the rear suspension and match the development of the project model, this paper takes the double torsionbars of vehicle suspension as research objects, a calculating method for the dynamic load distribution coefficient is designed. Then the simulation of torsionbar and its surrounding parts ultimate bearing capacity is calculated according to the failure chain relationship, and the vehicle test experience is completed. The results show the simulation calculation of the failure area stay consistent with those of the experiment test, which confirmed the design and ultimate bearing capacity simulation analysis of the mounting system are accurate and effective in this method and can be used to provide reliable guidance for the subsequent vehicle double torsionbars design. References | Related Articles | Metrics

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Fracture Fault Analysis of Spinning Pulley in a Diesel Engine Based on Finite Element Method QI Bin 2023, 48(13): 69-72.  DOI: 10.16638/j.cnki.1671-7988.2023.013.013 Abstract ( )   PDF (1483KB) ( )   The spinning pulley of an engine broke in the durability test. To address this issue, the stress of the spinning pulley system is analyzed using the ABAQUS software based on test loading conditions, the analyses show that the stress safety factor of the spinning pulley cannot meet the design requirement. The maximum stress decline 35% by optimizing the spinning pulley system based on previous analysis, reaching the design requirement. The improved spinning pulley passed the durability test. This indicates that this structural reliability analysis method can effectively guide the design of the spinning pulley. References | Related Articles | Metrics

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Design and Implementation of Automobile Temperature Control Cup Control System JIANG Changkun 2023, 48(13): 73-79.  DOI: 10.16638/j.cnki.1671-7988.2023.013.014 Abstract ( )   PDF (2480KB) ( )   With the improvement of living standards, people's demand degree for automobile is getting higher and higher, and placing a temperature control cup on the automobile is loved by many people. In order to solve the problem of no hot water for long-term driving, an automobile temperature-controlled cup control system is developed.The system adopts microwave heating, adjusts the set temperature value of the liquid (such as mineral water, tea, coffee, etc.) in the temperature control cup by rotating the temperature control cup, and displays the temperature in the temperature control cup, the set temperature value, the set working mode and the fault prompt through the automobile video and audio entertainment system, and the temperature control cup system control the heating temperature curve according to the working mode, so as to achieve the best tasting effect. The temperature-controlled cup lid displays the real-time temperature of the liquid in the temperature-controlled cup through liquid crystal display (LCD), and after a lot of experiments proved the performance of the system is stable and reliable to meet the needs of users. References | Related Articles | Metrics

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A Method for Improving NVH Performance of a Supercharger LI Fei 2023, 48(13): 80-84.  DOI: 10.16638/j.cnki.1671-7988.2023.013.015 Abstract ( )   PDF (1258KB) ( )   Supercharger noise will greatly reduce the acoustic quality of the vehicle, causing noise interference to drivers and passengers. This paper first describes the structure, principle and characteristics of the supercharger, analyzes the generation mechanism of various types of noise, and finds out the enhancement method, and then judges the effectiveness of the enhancement method by combining the noise comparison test before and after the enhancement with the subjective evaluation of personnel. Finally, we find out the relevant suggestions of various noise enhancement methods, and effectively apply them in the specific development products, and achieve good results. References | Related Articles | Metrics

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Ergonomic Design of Micro Pure Electric Passenger Vehicle ZOU Baoyi 2023, 48(13): 85-88.  DOI: 10.16638/j.cnki.1671-7988.2023.013.016 Abstract ( )   PDF (846KB) ( )   The paper briefly describes the development of micro passenger vehicles and micro pure electric passenger vehicles in China. From the perspective of vehicle architecture design, the key factors affecting the ergonomic design are summarized, and the design characteristics of minivans are discussed from the aspects of driving attitude, cockpit space, vehicle vision, convenience of operation, convenience of boarding and boarding, and the corresponding design methods and design indicators are proposed. The paper also discusses the impact of the future new technology application on the ergonomic design of micro pure electric passenger vehicle. References | Related Articles | Metrics

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Analysis and Control of Truck Vibration under Starting and Stopping Conditions YIN Jinxiang 2023, 48(13): 89-92.  DOI: 10.16638/j.cnki.1671-7988.2023.013.017 Abstract ( )   PDF (1248KB) ( )   This paper analyzes the problem of cab vibration caused by the starting and stopping of trucks. When the engine starts and stops, the change of engine rotation causes the change of excitation frequency. When the excitation frequency is coupled with the rigid body mode of the powertrain, resonance vibration occurs. Based on this, the design method of engine torque shaft and elastic shaft, as well as the longitudinal stiffness adjustment method of the mounting system are proposed. Through these two methods, the decoupling rate of the powertrain is improved, and the displacement of the powertrain when the engine starts and stops is reduced, so that the vibration of the powertrain is reduced. According to the theoretical calculation results, a sample is made and verified on the real vehicle. From the actual test results, the effect is obvious, which has guiding significance for solving practical engineering problems. References | Related Articles | Metrics

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Design of Door Panel Indentation Machine for Automobile Body Repair DING Xinqiao 2023, 48(13): 93-98.  DOI: 10.16638/j.cnki.1671-7988.2023.013.018 Abstract ( )   PDF (1911KB) ( )   In the car body repair teaching activities or car body repair skills competitions in vocational colleges, the indentation with the same position and shape must be made safely and quickly on the door so that students or competitors can use it. The indentation machine designed in this paper can be used to specially manufacture the door indentation. Through the analysis of ANSYS, the main components of the indentation machine can meet the mechanical performance requirements that need to be met in work. Compared with the common indentation machine on the market, this new type of indentation machine has the advantages of simple structure, more convenient use, lower cost, easy control of indentation depth and position, and can make corresponding molds according to different indentation requirements, which is convenient for teaching and competition. References | Related Articles | Metrics

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Analysis of Waterway Design Scheme of Electric Vehicle Motor Controller CHEN Yongzhi 2023, 48(13): 99-104.  DOI: 10.16638/j.cnki.1671-7988.2023.013.019 Abstract ( )   PDF (7873KB) ( )   The design scheme of electric vehicle motor controller waterway has been flourishing in the industry, and a variety of schemes exist in parallel. The selection of the final scheme has been a difficult problem for the industry. Aiming at this problem, this paper introduces and compares the structural characteristics, performance simulation and manufacturing cost of different waterway design schemes. Finally, it is determined that the waterway seal using bolt fastening after glue is the best choice from the perspective of cost, and the friction welding seal is the best solution from the perspective of reliability and production efficiency, which provides a reference for the subsequent industry to choose the channel design scheme of motor controller. References | Related Articles | Metrics

Testing and Experiment

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Dynamic Analysis of Heavy Truck Drive Axle Housing Based on Workbench LI Jing 2023, 48(13): 105-110.  DOI: 10.16638/j.cnki.1671-7988.2023.013.020 Abstract ( )   PDF (2707KB) ( )   Taking CA141 Jiefang truck as the research object, this paper establishes the 3D model of the drive axle housing with the software SolidWorks, and uses ANSYS software to conduct dynamic analysis of the drive axle housing. Firstly, the vibration frequencies of each order are obtained through modal analysis. The frequencies of the first six vibration modes of the axle housing structure in the constrained mode are not in the range of 0～50 Hz, and the axle housing will not produce resonance in the normal operation process. Then, based on the modal analysis, the transient dynamic analysis and random vibration analysis of the axle housing are conducted. It is found that the maximum equivalent stress and strain are located near the leaf spring seat of the axle housing, and at the same time show a positive correlation trend with the change of load, and the maximum shear stress and directional acceleration also show a regular decreasing or periodic change, which provides a more perfect theoretical reference for the optimal design and research of the axle housing. References | Related Articles | Metrics

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Off-line Detection Technology of E-axle of New Energy Commercial Vehicle ZHANG Jingchun 2023, 48(13): 111-116.  DOI: 10.16638/j.cnki.1671-7988.2023.013.021 Abstract ( )   PDF (1724KB) ( )   E-axle is the core component of new energy commercial vehicle. Its quality directly affects the performance of the whole electric commercial vehicle. In order to evaluate the assembly quality and standardize the off-line inspection, the off-line inspection technology of e-axle is studied. The current standards related to the inspection of e-axle are investigated, and the suggestion of establishing the offline inspection specifications and standards for the e-axle assembly of commercial vehicles is put forward. According to the relevant inspection standards, combined with the structural characteristics of the e-axle of commercial vehicles and the inspection status of the axle enterprises, four important off-line inspection items are proposed, and the inspection methods and technical requirements are introduced respectively. The level of detection technology guides the continuous improvement of the overall level of the electric drive axle of commercial vehicles from. The research provides reference for offline detection technology, quality control and fault diagnosis of similar products. References | Related Articles | Metrics

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Power Performance Simulation of Fuel Cell Heavy Truck Based on Cruise ZHAO Xurong 2023, 48(13): 117-122.  DOI: 10.16638/j.cnki.1671-7988.2023.013.022 Abstract ( )   PDF (3299KB) ( )   4×2 hydrogen fuel cell heavy truck is the research object in this paper, and its vehicle power system is studied. Firstly, the power system structure of hydrogen fuel cell truck is studied. Secondly, the structural form of the power system of the hydrogen fuel cell heavy truck is comprehensively analyzed, and the power system structure of the hybrid drive of the fuel cell and the traction battery is selected, and the power system components of the hydrogen fuel cell heavy truck are selected and the parameters are matched. Finally, AVL Cruise is used to establish the whole vehicle model of hydrogen fuel cell heavy truck, set the parameters of each module in the whole vehicle model, and test the dynamic performance of the whole vehicle of hydrogen fuel cell heavy truck. The results show that the power performance of the hydrogen fuel cell heavy truck is good, which provides a reference for further optimization of the power system. References | Related Articles | Metrics

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Effect of VOC Purification Capacity of Air Cleaner for Bus ZHOU Zhaolu 2023, 48(13): 123-127.  DOI: 10.16638/j.cnki.1671-7988.2023.013.023 Abstract ( )   PDF (1361KB) ( )   With the revision of Hygienic Standard and Detect Methods for the Air Quality Inside Interurban Bus (GB/T 17729), the limits of the concentration of volatile organic compounds (VOC) in the bus will become lower, and the detect methods also allow using the air cleaner devices to purify the air in the bus. So it is significant to study the removing rate of VOC and cleaning energy efficiency of air cleaner devices. With 8～12 times of the limit values of toluene, xylene and formaldehyde in the revised GB/T 17729 as the initial concentration of the decay test, the test results shows:1) the removal efficiency of VOC by powered air cleaner device is related to the air volume, and the larger the air volume, the greater the removal efficiency; 2) the removal efficiency of toluene and xylene by powered air cleaner device is better than that of formaldehyde; 3) the removal effect of high voltage electrostatic air cleaner device on VOC is obviously better than that of negative oxygen ions; 4) the VOC purification efficiency of non power type air cleaner devices is higher than that of power type air cleaner devices; 5) the removing rate of toluene in one hour can reach 91.6%, xylene in one hour can reach 93.7%, and formaldehyde in one hour can reach 83.0%. References | Related Articles | Metrics

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The Research on Automatic Parking Assist Function Based on Electric Power Steering System YU Dong 2023, 48(13): 128-132.  DOI: 10.16638/j.cnki.1671-7988.2023.013.024 Abstract ( )   PDF (1619KB) ( )   To realize the vehicle automatic parking function, not only need the automatic parking assist module for reasonable parking path planning, but also need the electric power steering module for smooth steering output in order to create a good and comfortable automatic parking experience. Different roads, different scenes of parking performance are closely related to electric power steering (EPS) system automatic parking assist (APA) function. Whether the electric power steering system can meet the performance requirements of the whole vehicle automatic parking, the debugging and calibration of the steering system APA function module parameters are particularly important. The vehicle test shows that it can make the vehicle APA function of various performance indicators to be effectively improved by reasonable debugging optimization of the EPS system APA module parameters. References | Related Articles | Metrics

Process·Materials

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The Application of Machine Vision Technology to Improve Vehicle Quality and Efficiency JIANG Xianmao 2023, 48(13): 133-136.  DOI: 10.16638/j.cnki.1671-7988.2023.013.025 Abstract ( )   PDF (1336KB) ( )   In order to solve the problems of synchronous improvement of vehicle manufacturing process efficiency and quality, traceability of assembly quality and process quality problems in the process of vehicle manufacturing, and analysis and early warning of vehicle product quality and tooling equipment quality data, this paper analyzes the important functions that machine vision technology can achieve in the process of vehicle manufacturing, and focuses on the technical path that vision technology can help improve quality and efficiency. Based on the failure mode and effects analysis (FMEA) quality tool, the application plan of machine vision technology is put forward for quantitative analysis, and the classification and application scenarios of machine vision technology are summarized to provide references for the application of machine vision technology in the vehicle manufacturing process, the improvement of vehicle quality and efficiency, and the improvement of vehicle intelligent manufacturing level. References | Related Articles | Metrics

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Study on the Welding Process of 1 700 MPa Grade Ultra-high Strength Protective Steel YANG Li 2023, 48(13): 137-140.  DOI: 10.16638/j.cnki.1671-7988.2023.013.026 Abstract ( )   PDF (3596KB) ( )   In order to ensure that the performance of welded joint of armor steel meets the requirements of product structure design, the welding experiments of 30MnMoTiB (4.5 mm), a new type of armor steel of 1 700 MPa grade, are carried out by three kinds of welding processes: metal active gas (MAG) arc welding, laser-MAG hybrid welding and laser wire filling welding, 830 MPa grade low-alloy steel welding wire of ER83-G is adopted. The test results indicate that the MAG welding undergoes significant deformation, moreover, the fusion of the weld base metal is relatively low, and the joint strength can only reach 64% of the standard tensile strength value of the base metal; laser-MAG hybrid welding and laser wire filling welding has almost no deformation, and the fusion ratio of the weld base metal is high. The joint strength can reach 81% and 93% of the standard tensile strength value of the base material, the welding strength and efficiency have been significantly improved on the basis of MAG welding. References | Related Articles | Metrics

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A Brief Discussion on the Technology of Cylinder Head Conduit Seat Ring ZHANG Mingming 2023, 48(13): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2023.013.027 Abstract ( )   PDF (1497KB) ( )   The valve guide seat processing technology is the engine cylinder cover key parts of the machine with one of the key technologies, high temperature, the use of mechanical friction and chemical corrosion environment, the valve and valve seat components require very high, as the engine compression ratio is more and more big, the engine under stress is becoming more and more big, the valve guide and valve seat ring geometric accuracy requirements also more and more high. This topic focuses on the engine cylinder head valve seat machining related content. In order to find a general method of valve seat machining, and identify various failure modes of valve seat machining, provide various solutions to machining anomalies. References | Related Articles | Metrics

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Improvement Method of Automobile Body in White of Gluing Equipment LI Jiming 2023, 48(13): 145-149.  DOI: 10.16638/j.cnki.1671-7988.2023.013.028 Abstract ( )   PDF (1915KB) ( )   In the automobile manufacturing industry, the gluing process is widely used in the production process of the body-in-white welding workshop. Due to the incomplete function of the gluing equipment itself, human reasons and insufficient intelligence of the equipment, the gluing material is not used to the maximum extent, and the maintenance efficiency and maintenance cost also have a large optimization space. Through the analysis of the problems generated in the production process, the technical improvement of the gluing equipment and the study of the intelligence degree of the equipment with the help of digital technology, the gluing material can be fully used, the maximum utilization of production materials has been achieved, and the obvious effect has far-reaching significance for environmental protection. At the same time, it improves the work efficiency of maintenance personnel and optimizes the maintenance cost. References | Related Articles | Metrics

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Flexible Manufacturing Planning Concept of Body Platform under the Rapid Development of New Energy Vehicles ZHANG Yan 2023, 48(13): 150-154.  DOI: 10.16638/j.cnki.1671-7988.2023.013.029 Abstract ( )   PDF (1882KB) ( )   The aim of this study is to explore the use of automated guided vehicle (AGV) in automotive manufacturing to enable flexible manufacturing to adapt to market changes and consumer demand. Through observation and analysis of the SAIC Volkswagen production line, it is found that the company successfully produced new energy and other platform models on the existing fuel vehicle production line under financial and time pressure. To enable free switching of positioning fixtures between different platforms, heavy-duty AGV are used to carry positioning fixtures for various models on their backs and to switch fixtures freely inside and outside the bodywork line. The research methodology consists mainly of observing, analysing and comparing the advantages and disadvantages of different manufacturing strategies. The results show that the use of a flexible manufacturing planning concept enables the free switching of positioning fixtures for different platforms with minimal investment, the most compact footprint and the least amount of production line modification, thus satisfying the integration of various shapes and various platform models. This study has validated the effectiveness and feasibility of flexible manufacturing using AGV in the automotive manufacturing sector. This finding provides new ideas and methods for the automotive manufacturing industry to respond to market changes and consumer demands, and helps to improve production efficiency and reduce manufacturing costs. References | Related Articles | Metrics

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Development and Application of Body VIN Code Recognition System Based on Machine Vision in Vehicle Manufacturing YE Liqing 2023, 48(13): 155-160.  DOI: 10.16638/j.cnki.1671-7988.2023.013.030 Abstract ( )   PDF (1252KB) ( )   Intelligent and automated industrial production is one of the foundations for improving the competitiveness of companies. By installing industrial cameras and light sources at workstations as the hardware system, and using Python as the programming language, and OpenCV and TensorFlow as the core to develop a machine vision based body vehicle identification number (VIN) recognition system as the software system , the body VIN images taken by the industrial cameras are trained and recognised for use to realise the intelligent operation of the body VIN scene in the field of vehicle manufacturing. The recognition accuracy rate currently reaches 99.8% after testing on site. In addition to the recognition of the images themselves, the system has also develope a unique four-fold error prevention strategy based on the process of the site to achieve the goal of "0" error outflow. The development of a machine vision based body VIN identification system has helped to improve the intelligence of industrial production and provided more possibilities for the development of self-sustainable systems for the use of machine vision in industrial production, improving the ability of enterprises to reduce costs and increase efficiency, and enhancing their competitiveness. References | Related Articles | Metrics

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Application of Automatic Greasing Equipment in the Combination of Engine Transmission Vehicle Manufacture Engineering Department, Shanghai Automotive Industry Corporation General Motors 2023, 48(13): 161-164.  DOI: 10.16638/j.cnki.1671-7988.2023.013.031 Abstract ( )   PDF (1368KB) ( )   In order to implement the automation of spline grease spraying process for the powertrain, which is effectively ensure the accuracy of grease and improve the stability of the process, the paper introduces a new application integration scheme of greasing equipment. Analyze the feasibility of a new automatic greasing equipment through the interaction of mechanical and electrical components. The equipment is safe and stable, suitable for production on multiple vehicle platform, and has been effectively applied in production. References | Related Articles | Metrics

Use and Maintenance

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Diagnosis and Practice of Bad Acceleration Failure of Gasoline EFI Engine ZHANG Yongjun 2023, 48(13): 165-170.  DOI: 10.16638/j.cnki.1671-7988.2023.013.032 Abstract ( )   PDF (1346KB) ( )   The poor acceleration fault of gasoline electronic fuel injection(EFI) engine is one of the key points and difficulties for automobile maintenance personnel to diagnose and eliminate. This paper analyzes and sorts out the influencing factors of the oil circuit, circuit, gas circuit and machinery that cause the poor acceleration of gasoline EFI engine, explores and summarizes the diagnosis methods and ideas combined with years of practical experience, and analyzes and applies them with cases, so as to provide reference for engine troubleshooting. References | Related Articles | Metrics

Use and Maintenace

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Research of Automobile Water Pump Water Seal Abnormal Noise Fault Analysis and Optimization LIU Hua 2023, 48(13): 171-175.  DOI: 10.16638/j.cnki.1671-7988.2023.013.033 Abstract ( )   PDF (2565KB) ( )   Based on the abnormal sound fault of automotive water pump seals, this paper discusses the aspects of product structure, possible causes of abnormal sound, and solutions, forming some reference content. The analysis methods used in this article include data collection, bench reproduction, structural and process improvement, and effect verification. Detailed analysis is conducted on the factors that may cause abnormal sounds, and ultimately, slip adhesion phenomenon is identified as the main cause of abnormal sounds. On this basis, a series of process optimizations are carried out and good results are achieved. References | Related Articles | Metrics

Automobile Education

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On the Teaching Reform of the Course of Hydraulic and Pneumatic Transmission with the Professional Characteristics GUO Zhanhong 2023, 48(13): 176-179.  DOI: 10.16638/j.cnki.1671-7988.2023.013.034 Abstract ( )   PDF (1529KB) ( )   Based on the shortcomings in the current teaching of Hydraulic and Pneumatic Transmission, combined with the demand for professional engineering talents in the new era and the problems in online teaching during the epidemic, the paper sets out from the professional reform, according to the different emphasis of different disciplines on hydraulic transmission control technology, the modular combination teaching program is established to enrich diversified information teaching methods through diversified practical teaching methods. It provides a reference for the training of highly skilled talents in hydraulic transmission control technology in the new era. References | Related Articles | Metrics

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Project Based Teaching Reform and Practice of New Energy Vehicle Maintenance and Fault Diagnosis Course TAN Xin 2023, 48(13): 180-184.  DOI: 10.16638/j.cnki.1671-7988.2023.013.035 Abstract ( )   PDF (1206KB) ( )   New energy vehicle maintenance and fault diagnosis is the core course of the new energy vehicle technology major, which determines whether students are qualified for professional positions such as new energy vehicle maintenance, testing, and repair. However, in the process of teaching practice, the author found that the knowledge in the textbook of this course is generally outdated, and the teaching methods and means are relatively single. In response to this, the paper proposes a student-centered approach, based on real business cases, real business masters, and real business environments. By restructuring project-based teaching content, exploring the construction of course training platforms, innovating teaching models, optimizing teaching processes, and reforming classroom evaluations, improve the learning atmosphere, stimulate interest in learning, improve the quality of teaching. References | Related Articles | Metrics

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Exploration on Experimental and Practical Teaching Reform of Vehicle Engineering Specialty Facing New Four Modernizations ZHANG Liu 2023, 48(13): 185-188.  DOI: 10.16638/j.cnki.1671-7988.2023.013.036 Abstract ( )   PDF (1017KB) ( )   At present, the automobile is developing vigorously in the direction of the new four modernizations (electric, intelligent, networked and shared), which puts forward higher requirements on the engineering practice ability of undergraduate talents in automobile colleges and universities, in order to adapt to the cross-disciplinary employment needs of new energy and intelligent. As the main way to exercise students' practical ability, it is particularly important and urgent to cultivate students' practical and innovative ability such as experiment and practical training. Aiming at the problems existing in the experimental and practical training of undergraduate vehicle engineering major, this paper puts forward specific teaching reform measures according to the new four modernizations of automobile, combined with the influence of the epidemic and curriculum ideology and politics, so as to provide reference and reference for universities to train innovative and practical talents of automobile. References | Related Articles | Metrics

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Exploration on the Teaching Reform of the Intelligent Connected Automobile Specialty Based on "B2X" ZHANG Meihong 2023, 48(13): 189-192.  DOI: 10.16638/j.cnki.1671-7988.2023.013.037 Abstract ( )   PDF (1093KB) ( )   : In combination with the cultivate characteristics of the students in intelligent networked automobile major, the "B2X" professional teaching mode reform is adopted, and relying on the survey data of the industry's talent demand, the knowledge points required by the talent's job ability are extracted, integrated into the higher vocational "automobile technology" competition, and combined with the 1+X certificate assessment standard corresponding to the intelligent networked automobile major, the supporting training courses are developed, which provides support for the financing of "post course competition certificate" and talent cultivation of the intelligent connected automobile major. At the same time, the training courses can also solve the problems of high investment cost, serious shortage of equipment, and low per student equipment rate in the training and teaching equipment of the intelligent network connected automobile major in various colleges and universities, then reduced the investment cost in the construction of the experimental training site. References | Related Articles | Metrics

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Analysis on the Teaching Reform of Automobile Integrated Curriculum Based on OBE Concept DANG Jinjin 2023, 48(13): 193-196.  DOI: 10.16638/j.cnki.1671-7988.2023.013.038 Abstract ( )   PDF (954KB) ( )   Automobile integration in higher vocational colleges often has a single teaching mode, abstract content, field when low student participation, students' passive learning phenomenon, this paper puts forward outcomes based education (OBE) teaching mode, through clear teaching objectives, in the classroom teaching content, rich teaching mode, in after-class teaching evaluation measures, the integration course from the traditional knowledge to the cultivation of the ability, the closed classroom into an open classroom. Through the integration of the automobile engine electronic control technology course, the results show that the teaching mode based on OBE can learn clarity before class, targeted classroom content, field skills specialization, well combining professional skills and industry development, strengthen job skills adaptability, clear students' future development goals, improve the students' employment options and opportunities. References | Related Articles | Metrics

Standards·Regulations·Management

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Test and Evaluation Method of Electronic Pneumatic Braking System for Commercial Vehicles FU Yue 2023, 48(13): 197-201.  DOI: 10.16638/j.cnki.1671-7988.2023.013.039 Abstract ( )   PDF (1446KB) ( )   Electronic pneumatic braking system (EBS) is a new electronic braking system gradually applied to commercial vehicles, and its function and performance have a direct impact on vehicle safety. Based on the general function and performance of EBS system, This paper selects a pure electric bus, van and 6×4 tractor to carry out comparative tests of electronic control function, response time, speed reduction control and brake assist, the test and evaluation method for EBS system are established, which provides a reference for EBS development and standards research. References | Related Articles | Metrics

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Analysis and Discussion on Camera Monitor Systems Latency and ISO Standard GUO Zhiyou 2023, 48(13): 202-206.  DOI: 10.16638/j.cnki.1671-7988.2023.013.040 Abstract ( )   PDF (1246KB) ( )   As a vehicle vision device, camera monitor systems (CMS) has been applied and subverted the concept of traditional physical rear-view mirrors, so that visual performance has been significantly improved, among which system delay is an important technical index, and also poses a new challenge to manufacturing enterprises. Combining the inherent characteristics of CMS hardware circuit and software image processing, this paper expounds the influence of different system delays on vehicle driving conditions, at the same time, the causes and solutions of the CMS latency are analyzedstudies. The results show that the optimal range of CMS latency is ≤33.33～ 43.33 ms. References | Related Articles | Metrics