Archive

30 June 2023, Volume 48 Issue 12 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Use and Maintenance
Use and Maintenace
Automobile Education
Standards·Regulations·Management


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New Energy Vehicle

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Simulation and Experimental Analysis of Tightening Torque Attenuation Characteristics of the Vehicle Power Battery Pack CHEN Yue 2023, 48(12): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2023.012.001 Abstract ( )   PDF (1190KB) ( )   Bolted connection is an important connection mode of battery pack, and due to the influence of vibration, it may be loose, and its connection reliability affects the performance and safety of battery system. This paper mainly adopts the simulation and test methods to study the torque attenuation of bolt connection between the upper and lower boxes of battery pack, calculates the modal shape of battery pack through simulation, and analyzes the bolt force distribution. According to the requirements of battery system vibration resistance in battery pack and system safety requirements and test methods (GB 31467.3－2015), the whole random vibration test of battery pack is carried out to compare the relative torque attenuation values and distribution rules of bolts in upper and lower case of battery pack before vibration, 1 h vibration and 3 h vibration.The results show that the bolt torque attenuation is about 6% after 1 h random vibration, and about 17% after 3 h vibration, and moreover, the structural characteristics of the battery pack affect the bolt torque attenuation distribution. In the region with fixed lug, the bolt torque attenuation is small, while in the region without fixed lug, the bolt torque attenuation is large, which provides reference for the reliability of bolt connection of battery system. References | Related Articles | Metrics

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Analysis on Durability Test of Fuel Cell Stack Based on Real Vehicle Road Spectrum WU Zhen 2023, 48(12): 6-11.  DOI: 10.16638/j.cnki.1671-7988.2023.012.002 Abstract ( )   PDF (1434KB) ( )   The main research purpose of this paper is to establish the vibration response characteristics of vehicle fuel cell stacks under actual road conditions and the bench test verification method. Therefore, based on the actual vehicle, the vibration spectra of fuel cell stacks under eight kinds of strengthened bad roads in the test site are collected, and the corresponding fatigue damage spectra of each road surface are calculated respectively. Then, according to Miner damage criterion and the vibration durability target of the vehicle fuel cell stack, the random vibration power density spectrum required by the bench equivalent durability test is obtained, and the 108 h vibration durability test of each axle of eight test sites can be equivalent simulated on the bench. At the same time, in order to achieve the purpose of further accelerated test, the duration of vibration durability test of each axle is compressed to the minimum of 33 h in this paper, and the limit response spectrum generated by power density spectrum of accelerated durability test bench is less than the maximum response spectrum of shock response spectrum of eight test sites, and it is ensured that the fuel cell stack will not produce unrealistic high load when conducting accelerated durability test bench. Therefore, this study proposes a vibration study that can be carried out on the bench under the vehicle working condition, which can effectively reduce the test time. References | Related Articles | Metrics

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Optimization Measures for Improving Understeer of an Electric Mini-vehicle DING Wei 2023, 48(12): 12-17.  DOI: 10.16638/j.cnki.1671-7988.2023.012.003 Abstract ( )   PDF (2931KB) ( )   In order to improve the problem of the lack of understeer for electric mini-vehicle based on the front drive chassis platform, this paper analyzes the generation mechanism and influencing factors of the understeer of the vehicle, combines the structural characteristics of the electric mini-vehicle suspension, proposes optimization measures from the aspects of hard points, elastic parts, bushings, etc., meanwhile builds the vehicle dynamics simulation model, and comprehensively evaluates the impact of the optimization measures on the understeer and roll gradient with the help of the vehicle simulation. The results show that the optimization measures can improve the understeer degree of the mini-vehicle. References | Related Articles | Metrics

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The Insulation Fault Improvement Scheme of Electric Vehicle Drive Motor ZHOU Chengxian 2023, 48(12): 18-21.  DOI: 10.16638/j.cnki.1671-7988.2023.012.004 Abstract ( )   PDF (2501KB) ( )   In order to solve the insulation failure of the drive motor in the application of electric vehicle, the structure of the drive motor electrical box is easy to cause condensation phenomenon. This paper first analyzes the motor design, motor assembly and vehicle application, and then analyzes the potential possible causes and carries out risk assessment. Through test verification, the generation and treatment of motor insulation failure are analyzed in detail, and the cause of motor insulation failure is determined. Through the tightness test of the drive motor bench, the effectiveness of the improvement measures is verified. By adjusting the position of the ventilation plug of the drive motor electrical box, the condensation phenomenon of the drive motor is fundamentally solved to ensure the good operation of the drive motor, and the problem that the pure electric vehicle could not run due to the insulation problem of the drive motor is solved. References | Related Articles | Metrics

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Analyse on Shift Control of Electric Direct Transmission MA Hongtao 2023, 48(12): 22-26.  DOI: 10.16638/j.cnki.1671-7988.2023.012.005 Abstract ( )   PDF (1276KB) ( )   As the core technology of automatic transmission control system, shift control determines the vehicle's power, economy and comfort indicators. The mechanical synchronizer is abandoned in the electric direct coupled transmission, which makes the gear matching function between the engagement sleeve and the engagement gear lacking, so that shift impact, such as tooth top impact and synchronous impact, is more likely to occur at the moment of gear shifting. Therefore, in the control of electric direct transmission, the problem of precise speed regulation of drive motor and sectional control of joint sleeve is introduced. This paper systematically analyzes the key factors that affect the shift jerk and shift impact, and improves the shift performance index by optimizing the shift schedule curve and the shift process control algorithm. Finally, the algorithm is verified by bench and vehicle road tests. It lays a foundation for subsequent product market launch and technology upgrading. References | Related Articles | Metrics

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Research on Braking Energy Recovery Strategy of Distributed Electric Bus SUN Zhaoxiang 2023, 48(12): 27-34.  DOI: 10.16638/j.cnki.1671-7988.2023.012.006 Abstract ( )   PDF (1315KB) ( )   With the proposal of the current "double carbon" goal, the popularity of electric vehicles is unprecedented, especially in the application of city buses. An important means to solve this problem is to design a reasonable braking energy recovery strategy to absorb the braking energy as much as possible, so as to increase the driving range. In this paper, based on fuzzy control algorithm and multi-objective optimization algorithm, two control strategies for braking energy recovery are designed. To verify the control capability of the control strategy, built a joint simulation platform based on TruckSim-Simulink, the final results show that the two control strategies can achieve brake energy recovery, and the multi-objective optimization control strategy is better. References | Related Articles | Metrics

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Overview and Potential Analysis of Tram Electric Heating Technology Route HE Yu 2023, 48(12): 35-38.  DOI: 10.16638/j.cnki.1671-7988.2023.012.007 Abstract ( )   PDF (758KB) ( )   Due to the trend of 800 V high voltage platform becoming the development of electric vehicles, electric heating technology for electric vehicles has been constantly upgraded, and thin film electric heating technology has broad prospects. This paper compares four types of automotive electric heating technology routes: resistance wire, positive temperature coefficient (PTC), thick film, and thin film, and conducts market research on leading automotive electric heater suppliers. It points out the development potential and existing bottlenecks of thin film electric heating technology. At present, the positive temperature coefficient (PTC) heating technology market is highly mature, and thin film thick film heating technology is a new technology. However, with the 800 V high voltage platform becoming the future trend in the industry, the advantages of thin film thick film heating technology are prominent, and it is fully possible to become the next mainstream heating technology. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Local Path Generation Strategy of Intersection Based on Topology Map WANG Yulong 2023, 48(12): 39-43.  DOI: 10.16638/j.cnki.1671-7988.2023.012.008 Abstract ( )   PDF (1587KB) ( )   Intersection is a complex traffic scene in the development of autonomous driving. The cost of using high-definition map scheme is high, and it is difficult to effectively identify intersection shape only by vehicle sensors. Therefore, an intersection local path planning algorithm based on open source topology map and vision is proposed. First, uses the open source topology map to plan the global navigation path which was used as a guide line. Then, semantic segmentation technology is used to identify the freespace in the visual image. At the same time, the local path’s starting point, end point and control points are determined by combining the real-time positioning information of the vehicle at the intersection. Finally, bazel curve interpolation method is used to obtain the curve cluster of alternative paths, and the optimal local path is selected according to the result of the multi-dimensional weighted cost function. Then realizes the autonomous driving of the vehicle in the process of turning at the intersection. Experimental results show that the proposed strategy can effectively plan local paths at intersections without relying on high precision maps and improve the ability of autonomous vehicle to pass at intersections. The passing rate at intersection can reach 99%. References | Related Articles | Metrics

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A License Plate Location Algorithm Based on Contour Features CAO Wenping 2023, 48(12): 44-47.  DOI: 10.16638/j.cnki.1671-7988.2023.012.009 Abstract ( )   PDF (1372KB) ( )   In order to detect the location information of the license plate in the image quickly and conveniently, this paper proposes a license plate location algorithm based on image contour features. This algorithm is based on the correlation function in the OpenCV database. Firstly, using image preprocessing operations to enhance images, and then the license plate is located by contour search and area filtering. Then, the eligible contour is filtered according to the pixel information and width height ratio of the license plate. Finally, using the green border to frame the license plate and display and save the image after positioning. References | Related Articles | Metrics

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Lane Line Detection Method Based on Deep Learning ZHANG Lin 2023, 48(12): 48-52.  DOI: 10.16638/j.cnki.1671-7988.2023.012.010 Abstract ( )   PDF (1136KB) ( )   With the continuous development of artificial intelligence technology, driverless technology has become a hot topic in the current social development. Lane line detection is a key link of driverless technology, but the traditional vision-based lane line detection method takes a long time to process, and the process is tedious, requiring human intervention. The lane line detection based on deep learning can greatly reduce such problems. In this paper, an Enet network is designed to complete dual tasks, which solves the problem of target area segmentation and different lane differentiation respectively to achieve end-to-end detection.Compared with mainstream lane line detection network models deeplab v3 and YOLO v3, the experimental verification shows that the final training accuracy of the network model used in this experiment is 99.8%, which is 1.2% and 0.8% higher than deeplab v3 and YOLO v3, respectively. References | Related Articles | Metrics

Design and Research

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Control Strategy of Electronic Oil Pump for Automotive Hybrid Transmission HE Yang 2023, 48(12): 53-59.  DOI: 10.16638/j.cnki.1671-7988.2023.012.011 Abstract ( )   PDF (1491KB) ( )   The electronic oil pump is a highly integrated vehicle part integrating electronics, machinery and hydraulics. Its control strategies are different according to the requirements of the application environment and the types of driving motors. This paper studies the control strategy of the electronic oil pump applied to the vehicle hybrid power transmission, combs the mathematical model of the motor and the basic theory of vector control, builds the simulation model of the electronic oil pump based on Simscape, and the simulation results show that the electronic oil pump starts smoothly, the speed response speed is less than 200 ms, and the torque ripple under steady state conditions is about 5.88%. From the simulation results, it can be seen that the strategy of double closed loop vector control combined with maximum torque per ampere (MTPA) control and weak magnetic control algorithm has the ability to realize the function of electronic oil pump. The test verification proves that under the common working conditions of the vehicle, the output high-pressure pressure of the electronic oil pump can reach 50 bar, the maximum lubrication flow can reach 21.4 L/min, and the consistency of flow output of different electronic oil pumps is less than± 4%. References | Related Articles | Metrics

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Numerical Analysis of the Steady-state Characteristics of V-groove Opening Angle on End Face Dry Gas Seals YANG Xiqing 2023, 48(12): 60-66.  DOI: 10.16638/j.cnki.1671-7988.2023.012.012 Abstract ( )   PDF (1848KB) ( )   End face dry gas seals have been widely used in chemical rotating machinery, but there is a lack of systematic research on the bi-directional rotating groove type of its sealing sub. The corresponding mathematical model is established based on the theory of gas film lubrication for the operating principle and structural characteristics of V-groove face dry gas seal. The coupled solution of the pressure and gas film thickness control equations was carried out using the central difference method, and the correctness of the prepared program was verified. Then, the steady-state charac-teristics of the end face dry gas seal are calculated using the validated code, and the effect of different opening angles of the V-groove on the steady-state characteristics of the end face dry gas seal when the operating parameters are changed is analyzed and discussed. The study shows that the mathematical model is universal and the best sealing performance is achieved with the opening angle of V-groove α=15°, and the sealing effect of the four opening angles is ranked as follows α=15°> α=60°>α=30°>α=45°. The leakage volume decreases slightly with the increase of rotational speed and increases linearly with the increase of pressure. The results of this study provide a reference for the design and research of bi-directional rotating groove type of end face dry gas seal. References | Related Articles | Metrics

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Analysis and Improvement of the Leakage Problem of a Certain Type of Radiator HAN Jianwei 2023, 48(12): 67-71.  DOI: 10.16638/j.cnki.1671-7988.2023.012.013 Abstract ( )   PDF (2530KB) ( )   During the adaptability test of a certain type of product in the severe cold area, the root of the radiator heat pipe cracked, which led to the leakage of the radiator and seriously affected the use of the product. In this paper, through the analysis and verification of the design structure, material, antifreeze filling process and fracture of the radiator, it is confirmed that due to the defects in the antifreeze filling method, the internal air of the radiator is not removed clean and the heat is out of balance in the left and right area of the radiator at low temperature, fatigue cracking occurs in the heat pipe. The rectifying measures of perfecting the filling method of radiator antifreeze and defining the filling amount are adopted to rectify the problem, and the test verification of the rectified vehicle is carried out, which solves the problem of radiator leakage and improves the reliability of the product. It can be used as a reference for the design and production of similar products. References | Related Articles | Metrics

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Failure Analysis of a Type of Engine Pulley LI Yongchun 2023, 48(12): 72-76.  DOI: 10.16638/j.cnki.1671-7988.2023.012.014 Abstract ( )   PDF (2407KB) ( )   Engine; Damping pulley; One-way clutch; Spring; Failure analysis References | Related Articles | Metrics

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Structural Design and Computational Analysis of Shaft Fort for the Steering Drive Axle DOU Cong 2023, 48(12): 77-79.  DOI: 10.16638/j.cnki.1671-7988.2023.012.015 Abstract ( )   PDF (1618KB) ( )   The shaft fork is one of the key components in the steering drive axle, and its structure rationality directly affects the steering and bearing performance of the whole axle. From the structural design, material selection, motion check and calculation analysis of an 18 t steering drive axle shaft fork, the paper expounds the design and analysis process of the shaft fork in detail, and determines the feasibility of the design product from the simulation aspect through finite element analysis, which provides the method and theoretical support for the design and analysis of similar products. References | Related Articles | Metrics

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Design Improvement of a Power Assembly Mount Rubber Cushion Bolt Loosening HUANG Xianke 2023, 48(12): 80-84.  DOI: 10.16638/j.cnki.1671-7988.2023.012.016 Abstract ( )   PDF (1081KB) ( )   Bolt looseness is a difficult problem in automobile reliability, which often troubles automobile designers. In this paper, the pre-tightening force, mounting torque and contact surface yield strength of the bolts are calculated and checked by technical cooperation with fastener manufacturers. According to the problems of the contact surface of the suspension bracket, such as the risk of yield collapse and the lack of the pre-tightening force of the bolts, the corresponding improvement schemes are made respectively, and the range of the mounting torque of the fastening bolt is finally determined, to meet the requirements of mounting rubber pad pre-tightening force. The mounting torque determined by the calculation method in this paper is fixed, and after fastener lateral vibration test and cross-country road test, the mounting rubber pad fastening bolts of powertrain mount do not loose again, it can be seen that the bolt loosening calculation check and improvement program is effective. In this paper, the pre-tightening force, mounting torque and the strength of the contact surface of the bolts are calculated and improved, which provides a very good solution to the problem of automotive bolt loose ideas and methods. References | Related Articles | Metrics

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Optimization of Design Strategy Based on Vehicle Glove Box Matching Problem Solving XUE Hao 2023, 48(12): 85-91.  DOI: 10.16638/j.cnki.1671-7988.2023.012.017 Abstract ( )   PDF (2462KB) ( )   This paper takes the issue of excessive vertical clearance between the lower body of the instrument panel and the glove box after a certain vehicle model's instrument panel assembly is tightened as an example, and systematically analyzes the adverse contributions and impacts of the glove box, the lower body of the instrument panel, tolerance adjusting nuts, and the cross car beam on the issue of excessive clearance. Based on the analysis, resolution and verification process of the problem, in order to address the size matching problem that occurs on the actual vehicle, define engineering development goals, and develop an effective positioning pin deviation and pre deformation strategy to control the vertical clearance on both sides of the glove box. On this basis, further exploration, research, and summarization will be conducted to provide reference for the matching design of dashboard and glove box in other subsequent projects. References | Related Articles | Metrics

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Research on Active Balancing Technology of SOC Multi-module Transformer Battery Pack SI Juanli 2023, 48(12): 92-96.  DOI: 10.16638/j.cnki.1671-7988.2023.012.018 Abstract ( )   PDF (1110KB) ( )   Aiming at the equilibrium rate and equilibrium efficiency between battery cells and battery modules of pure electric vehicles, the series connection circuit of battery cells and battery modules is designed to study the equilibrium rate and equilibrium efficiency of charging and discharging between battery cells and battery modules, and the active balancing mode of inductive and multi-module transformer between battery cells and multi-module transformer between battery modules is adopted. In the MATLAB/Simulink software environment, the corresponding simulation models are built, and the battery state of charge (SOC) is used as the equilibrium control variable, and the "mean-difference" control strategy is used to carry out simulation experiments. The simulation results show that the equilibrium time of the series battery unit using a multi-module transformer is three times that of the inductive equalization time. When the battery pack is balanced, the underlying cell SOC is quickly consistent through inductive balancing, and the top battery module is charged and discharged simultaneously through the transformer, so that the battery pack SOC is consistent. The monomer equalization adopts inductive type and the module adopts multi-module transformer type balancing, which is applied to the balancing of vehicle multi-battery boxes, which helps to improve the equalization rate and equalization efficiency. References | Related Articles | Metrics

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Research and Design of Vehicle Body Domain Controller Based on New Architecture REN Tianyuan 2023, 48(12): 97-101.  DOI: 10.16638/j.cnki.1671-7988.2023.012.019 Abstract ( )   PDF (2014KB) ( )   With the improvement of various functions and performance requirements of automobiles, the traditional automobile distributed electronic and electrical architecture has been unable to meet the market demand, and automobiles are changing from electronic control unit (ECU) distributed electrical architecture to domain centralized electrical architecture. This paper summarizes the current design scheme of vehicle body domain controller, and analyzes the advantages of adopting domain controller scheme in combination with the current market demand. And a body domain controller is designed. Based on the functional requirements of the real vehicle, the scheme of the body domain controller is designed. The feasibility of the scheme is verified through the functional test on the bench and the real vehicle, which lays the foundation for the mass production of the scheme. References | Related Articles | Metrics

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Analysis on the Structure of Frame and Functional Components of the Electric Seat LI Manli 2023, 48(12): 102-107.  DOI: 10.16638/j.cnki.1671-7988.2023.012.020 Abstract ( )   PDF (1928KB) ( )   The car seat frame and functional components are important carriers for supporting the sitting posture of drivers and passengers, and their appearance and layout parameters greatly affect the safety, operation, and comfort of drivers and passengers. The layout of the seat frame and functional components is the focus of seat engineering design and the foundation of styling design. Based on ergonomics and relevant laws and regulations, this paper analyzes the design principles and reference basis of the fore and aft adjustment, height adjustment, backrest rotation adjustment, lumbar four-way adjustment, and head restraint up and down adjustment of the electric seat, which can confirm the engineering hard points of the seat cushion, backrest, and head restraint position track in the modeling design stage, ensure that the modeling design conforms to safety, operability, and comfort, and improve the overall design quality of the electric seat, povide theoretical support for the seat frame module in the interior design of the entire vehicle, and improve the efficiency of the grouping design of the automotive interior. References | Related Articles | Metrics

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Simulation Verification and Lightweight Design of Automotive Refueling Pipes LIN Guofa 2023, 48(12): 108-113.  DOI: 10.16638/j.cnki.1671-7988.2023.012.021 Abstract ( )   PDF (2816KB) ( )   A lightweight multi-layer plastic fuel filler pipe is designed which meets China VI regulation. The overall weight of the fuel filler pipe is reduced 28 % by carrying out the lightweight material selection. Based on the existing production line, the extrusion of multi-layer bellows is realized by adding corrugated adsorption mold. Based on ANSYS Fluent, the computational fluid dynamics (CFD) simulation model of the fuel pipe is established, and the fluid flow analysis of the fuel pipe is carry out. The results show that the bellows can slow down the internal fluid flow and facilitate the formation of liquid seal. The refueling test bench is established, and the refueling test and ORVR test of common refueling guns are carried out. The test results show that the performance of the fuel pipe is good, and there will be no splash, reverse spray and early jump gun problems during refueling. The evaporated emission value is 7 mg/day, the refueling emission result is 3.5 mg /L, which meet design requirements. References | Related Articles | Metrics

Testing and Experiment

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Experimental Analysis on the Influence of Hydrogen Blend on the Combustion of Natural Gas Engine ZHOU Lei 2023, 48(12): 114-120.  DOI: 10.16638/j.cnki.1671-7988.2023.012.022 Abstract ( )   PDF (1525KB) ( )   Under the dual pressure of energy and environment, hydrogenation in natural gas engines is a good way to improve engine characteristics. In order to study the effect of hydrogenation ratio on the combustion and performance of natural gas engine, this paper will carry out hydrogenation equipment modification and bench test on a natural gas engine. The research results show that hydrogenation can accelerate the flame propagation speed of the mixture, shorten the duration of combustion in the cylinder, and significantly advance the combustion center of gravity, further increasing the maximum combustion temperature and maximum explosion pressure. But with the increase of engine load, this promotion effect is gradually weakened. References | Related Articles | Metrics

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Lightweight Commercial Vehicle Body Based on CAE Analysis HAN Min 2023, 48(12): 121-126.  DOI: 10.16638/j.cnki.1671-7988.2023.012.023 Abstract ( )   PDF (2860KB) ( )   On the premise of not changing the current design structure, the sheet thickness of some commercial vehicle body structures is optimized using computer aided engineering (CAE) analysis optimization and reliability test, and the application of lightweight technical solutions with the lowest mold modification cost is achieved. The indicators and results of performance analysis are used as the response and constraints of sensitivity analysis,topology and size optimization, respectively applying multi-condition optimization design tools considering comprehensive performance (stiffness, modal, crash safety). Conducts CAE analysis and optimization with goal of minimizing the total body mass, and determines the optimization scheme. The optimized structure is verified by reliability test, which verifies the feasibility of the optimization scheme. In the end, achieves the weight reduction of 14.1 kg, a decrease of 4.7%, and the maximization of economic benefits. References | Related Articles | Metrics

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Automatic Transmission Shift Process Control Based on the Lagrange Equation FENG Wei 2023, 48(12): 127-131.  DOI: 10.16638/j.cnki.1671-7988.2023.012.024 Abstract ( )   PDF (1247KB) ( )   In order to study the control method of automatic transmission (AT) shift process, this paper takes ZF9AT transmission as the research object, establishes the dynamic equation of AT shift process based on the lagrange equation, deduces the feedforward torque calculation method of shift process, the speed line diagram of component AT, and based on this, develop a gear shift control strategy. Through the hardware in the loop simulation test, the correctness of dynamic equation is verified, and result displays the developed control strategy can control the change of turbine speed and obtain good shift quality, which has a good guiding for the independent development of AT controller. References | Related Articles | Metrics

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Study on Removal Efficiency of Volatile Organic Compounds in Vehicle by Air Purifier Transport ZHAO Shaowei 2023, 48(12): 132-135.  DOI: 10.16638/j.cnki.1671-7988.2023.012.025 Abstract ( )   PDF (1207KB) ( )   This paper briefly describes the hazards of volatile organic compounds (VOCs) in vehicles, introduces the current standards of air purifier and air quality for passenger car and sedan. The delayed evaluation method and the comparative evaluation method are proposed,according to the shortcomings of existing standards, and the two methods analyzed for the advantages and disadvantages. The test results of the two methods are analyzed and discussed, the air purifier is evaluated. It provides a scientific basis for enterprises to choose air purifiers, and advocates the concept of leading enterprises to implement healthy travel. The proposed delay evaluation method can be combined with the test method of air quality in the bus, and it is not necessary to test the removal rate of VOCs by the air cleaner separately, which saves time and testing costs for enterprises. References | Related Articles | Metrics

Process and Equipment

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Research Status and Prospect of Automobile Painting Auxiliary Tooling CHEN Weiya 2023, 48(12): 136-143.  DOI: 10.16638/j.cnki.1671-7988.2023.012.026 Abstract ( )   PDF (6288KB) ( )   In order to effectively reduce costs and improve production efficiency, the paper introduces the types, styles, functions, requirements, daily maintenance and development steps of automobile painting auxiliary tooling，and the design ideas of painting auxiliary tooling is analyzed by studying the practical application of coating auxiliary tooling in vehicle plants and considering the requirements of future industry on tooling, the paper describes the development direction of flexible, simple structure, lightweight and integration of painting auxiliary tooling in the future. References | Related Articles | Metrics

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Improvement Scheme of Assembly Tooling for Automobile Propeller Shaft Universal Joint Assembly XU Yong 2023, 48(12): 144-148.  DOI: 10.16638/j.cnki.1671-7988.2023.012.027 Abstract ( )   PDF (2061KB) ( )   In order to ensure that the universal cross shaft assembly can achieve the state specified in the transmission shaft assembly design when working, when the universal cross shaft assembly in the transmission shaft assembly, we must avoid the assembly quality problems such as needle tilt, bearing pressure, cross shaft, needle surface scratch, oil seal extrusion deformation, and reduce the early failure of the universal joint assembly in the working state. The paper first expounds the common failure mode of universal axial cross shaft assembly, then analyzes the influence of the old and new equipment process on the universal axial cross shaft assembly, finally discusses the universal axial cross shaft assembly in the transmission shaft assembly, the comparative analysis of failure data before and after improvement proved the effectiveness of the new design process tooling. References | Related Articles | Metrics

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Application Analysis of the front Hood Inner Panel Connection Process GUO Haiyang 2023, 48(12): 149-153.  DOI: 10.16638/j.cnki.1671-7988.2023.012.028 Abstract ( )   PDF (1846KB) ( )   The connection between the front hood panel and the inner panel is mainly realized through the hemming process, while the complex process of the front hood inner panel assembly, plate thickness, equipment sharing and cost etc. This paper mainly combines with the actual processing efficiency, equipment commonality, cost and other factors to analyse the advantages and disadvantages of these current connection process such as spot welding, self piercing riveting (SPR), clinch and so on. The results show that in the selection of process, which should not only consider the characteristics of the material itself, but also consider the characteristics of various processes and the process characteristics of the line and body shared model products, so as to achieve cost reduction and maximum equipment benefit. References | Related Articles | Metrics

Use and Maintenance

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Diagnosis and Elimination of No Refrigeration of Kia Hybrid K5 Air Conditioner YANG Xueru 2023, 48(12): 154-158.  DOI: 10.16638/j.cnki.1671-7988.2023.012.029 Abstract ( )   PDF (2935KB) ( )   The air conditioning system of new energy vehicles is quite different from that of traditional fuel vehicles in terms of refrigerant, compressor working mode and air conditioning system control logic. Taking the no refrigeration of the air conditioning system of a Dongfeng Yueda Kia K5 hybrid electric car as an example, starting from the fault phenomenon, by searching for information such as the composition and working principle of the air conditioning system, adjusting the direction of fault finding with the help of new energy vehicle diagnostic instruments, comprehensively using technical means such as maintenance circuit diagram, reading fault code data flow, etc., analyze the cause of the fault, determine the nature and location of the fault, fundamentally find and solve the problem, and provide ideas and methods for new energy vehicle maintenance. References | Related Articles | Metrics

Use and Maintenace

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Detection and Maintenance of on-board Network System Based on Typical Cases of Magotan B8 Comfort System HU Xiaoxiao 2023, 48(12): 159-163.  DOI: 10.16638/j.cnki.1671-7988.2023.012.030 Abstract ( )   PDF (1559KB) ( )   On-board network enables timely and efficient data exchange and information sharing among electronic control units on the vehicle, it is widely used and has a significant impact in the automotive field, and the troubleshooting of on-board network systems has become one of the skills that automotive maintenance personnel need to master. The article takes the Volkswagen Magotan B8 model as an example to introduce the basic structure of the controller area network (CAN) bus and local interconnect network (LIN) bus of the car's comfort system, and provides the fault diagnosis case. Based on the working principle and characteristics of the car's comfort bus system, the article analyzes and summarizes the troubleshooting ideas and methods, which can provide reference for automotive technicians to learn about in car networks, improve efficiency and quality in practical fault diagnosis. References | Related Articles | Metrics

Automobile Education

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Exploration and Practice of Integration of "Classroom Revolution" and "Post-class Competition Certificate" －Taking the Electric Vehicle High-voltage Course as an Example ZHANG Rudan 2023, 48(12): 164-170.  DOI: 10.16638/j.cnki.1671-7988.2023.012.031 Abstract ( )   PDF (1727KB) ( )   In response to the national special action of "improving quality and cultivating excellence", it created a typical case of "classroom revolution" in the new energy vehicle major. The paper takes "improving quality and cultivating excellence" as the background, takes "classroom revolution"as the theme, takes the core course electric vehicle high-voltage safety and protection for new energy vehicle technology as an example, takes the "three education" reform as the core, and combines the specific requirements corresponding to the "post-class competition certificate". The teaching design is based on the attention, relevance, confidence, satisfaction (ARCS) model, project-based learning (PBL) method ability training, and outcome based education (OBE) teaching effect evaluation. The course assessment and the 1+X assessment are interoperable, and the online high-quality courses are developed. Under the online and offline hybrid teaching mode and the integrated teaching strategy of theory and practice, it leads the classroom revolution and creates typical cases for the practice of vocational education "classroom revolution". References | Related Articles | Metrics

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Teaching and Implementation for Applying Ability Improvement of New Energy Vehicle Technology Specialty Based on “1+X” Certificate System －Taking the Course Maintenance of Motor and Control System of New Energy Vehicle as an Example LIN Meibin 2023, 48(12): 171-175.  DOI: 10.16638/j.cnki.1671-7988.2023.012.032 Abstract ( )   PDF (1385KB) ( )   Combining with the actual situation, the main problems under the “1+X” certificate system are analyzed by this paper with the pilot works of “1+X”. Taking the course maintenance of motor and control system of new energy vehicle, the model of applying ability is established which meet requirements of industry and enterprise. The teaching efficiency is improved by adjusting teaching contents and optimizing teaching design which lay a foundation for cultivating advanced applicative talents. References | Related Articles | Metrics

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Teaching Reform of Automobile Structure Based on the Integration of CDIO and Engineering Education Certification FU Qiang 2023, 48(12): 176-180.  DOI: 10.16638/j.cnki.1671-7988.2023.012.033 Abstract ( )   PDF (1298KB) ( )   Aiming at the problems existing in the traditional teaching plan of automobile structure, takes conception, design, implementation and operation (CDIO) as the teaching method and effectively combines content of engineering education certification system, and formulate the CDIO teaching objectives, corresponding graduation requirements correlation matrix, engineering education evaluation system, and re-establishes CDIO curriculum design improvement measures. The teaching method of CDIO engineering education is adopted to increase the content of product design questions and discussions, so as to achieve the graduation requirements of certification. Through the practice of automobile structure teaching reform, the teaching objectives and the ability to solve engineering problems have been significantly improved, which verifies that CDIO teaching ideas and methods can meet the core requirements of engineering education certification. References | Related Articles | Metrics

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Research on the Smart Classroom Model for Automotive Majors Based on the "Double Main, Three Section and Five Links" LIU Qiongqiong 2023, 48(12): 181-186.  DOI: 10.16638/j.cnki.1671-7988.2023.012.034 Abstract ( )   PDF (1442KB) ( )   Under the background of the deep integration of modern information technology and vocational education, the construction of smart classroom is conducive to the individualized learning of students and the cultivation of students' comprehensive quality. On the basis of referring to the theoretical research results of domestic scholars on intelligent classroom, according to the characteristics of teaching and learning of automotive majors in higher vocational colleges, this paper reflects the teacher-led, student-dominated, and constructs the intelligent classroom teaching model of "double main, three sections and five links" before, during and after class, aiming at actively exploring the intelligent classroom teaching model suitable for automotive majors. In order to cultivate high-quality talents to improve quality. References | Related Articles | Metrics

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The Training Path of Integration Talents of Science and Education in Automobile Service Engineering LI Xiangqin 2023, 48(12): 187-191.  DOI: 10.16638/j.cnki.1671-7988.2023.012.035 Abstract ( )   PDF (1160KB) ( )   The application-oriented undergraduate colleges and universities are the main bases for the cultivation of application-oriented talents. Under the background of the reform of the automobile industry and the new engineering disciplines, the application-oriented undergraduate colleges and universities should explore a new talent training model. The integration of science and education aims to combine scientific research and teaching work to educate people in a coordinated way, which is a research hot spot of the education model of various colleges and universities today. Taking the automobile service engineering major of Jiangxi University of Science and Technology as the research object, this paper analyzes the current situation and main problems of the automobile service engineering major in science education integration education, and discusses the path of science education integration education of automobile service engineering major from the perspectives of talent training system, science education integration status, student participation in scientific research status, science education integration mechanism, and practical status of scientific research platform. The research results can provide some reference for the model of science education integration of automobile service engineering specialty in application-oriented undergraduate universities. References | Related Articles | Metrics

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Application Research and Practice of Deological and Political Course in Automobile Chassis Construction and Maintenance ZHANG Wenna 2023, 48(12): 192-195.  DOI: 10.16638/j.cnki.1671-7988.2023.012.036 Abstract ( )   PDF (1022KB) ( )   This paper guides by the fundamental task of establishing morality and cultivating people, and combines with the characteristics of the course automobile chassis construction and maintenance, expounds how to integrate the ideological and political education of the course into the professional teaching process from the aspects of the ideological and political education goal, design ideas, ideological and political content, teaching team, teaching methods, assessment and evaluation, so as to achieve the imperceptible educational effect by integrating knowledge and skills teaching with value cultivation. References | Related Articles | Metrics

Standards·Regulations·Management

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Product Planning Based on Big Data and Double Points Policy XUE Haitao 2023, 48(12): 196-202.  DOI: 10.16638/j.cnki.1671-7988.2023.012.037 Abstract ( )   PDF (1462KB) ( )   Across the entire automotive ecosystem, policy has a huge impact on product planning. The benchmark for the development of vehicle companies relies on national policies. If any vehicle company wants to develop healthily and long-term, it is inseparable from the support of national policies. Therefore, the study of policy factors is of great significance for the development planning of future car companies. However, in traditional new energy vehicle product planning, the impact of policy factors is not considered. Therefore, this paper conducts research based on the perspective of big data and combine with the national double-point policy, realizes the construction of a profit model from a policy perspective, and then puts forward future product planning opinions. Firstly, use the grey time series function model to forecast the sales and production of vehicles; Secondly, combine with the forecast data and the relevant national regulations on the double-point policy, establish a new energy vehicle double-point policy subsidy profit model; Finally, the representative model of SAIC-GM-Wuling Wuling Hongguang Mini EV is selected for case analysis, and based on the profit model, it puts forward planning opinions on Wuling's future new energy vehicle products. The applicability of the model is verified by case analysis, which has certain practical significance. References | Related Articles | Metrics

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Assessment of Energy Consumption and Greenhouse Gas Emissions of Electric Vehicles with Different Powertrains －Taking Shaanxi Province as an Example LEI Chenyang 2023, 48(12): 203-209.  DOI: 10.16638/j.cnki.1671-7988.2023.012.038 Abstract ( )   PDF (1582KB) ( )   To achieve the goals of carbon peaking by 2030 and carbon neutrality by 2060, the transportation department is actively promoting vehicle electrification. This paper analyzes the greenhouse gas emissions and energy consumption of five types of vehicles: battery electric vehicles (BEV), plug-in hybrid electric vehicles (PHEV), extended range electric vehicles (EREV), hybrid electric vehicles (HEV), and internal combustion engine vehicles (ICEV) in the context of the power structure in Shaanxi province in 2020. The research results indicate that compared to ICEV, BEV,PHEV, EREV, and HEV achieve reductions in emissions by 34.7%, 27.3%, 10.8%, and 27.6%, respectively, over the life cycle of the vehicles. Additionally, their energy consumption is reduced by 33.8%, 17.1%, 7.45%, and 29.7%, respectively. As the degree of vehicle electrification increases, the primary emissions shift to the electricity generation stage. Further analysis of future scenarios reveals that increasing the penetration rate of BEV and improving the proportion of renewable energy in the grid will contribute to achieving Shaanxi province's carbon peaking target by 2030 and carbon neutrality target by 2060. These research findings demonstrate that promoting vehicle electrification in Shaanxi province is an effective pathway to achieving carbon reduction goals. By reducing greenhouse gas emissions and energy consumption, Shaanxi province can make positive contributions to addressing climate change and achieving sustainable development. References | Related Articles | Metrics