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30 June 2022, Volume 47 Issue 12 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Design of Insulation Resistance Simulation Test System for a Pure Electric Vehicle SUI Meili 2022, 47(12): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2022.012.001 Abstract ( )   PDF (471KB) ( )   In order to test the insulation resistance of the high-voltage system of pure electric vehicles, this paper adopts the insulation resistance detection scheme based on the electric bridge method, uses AVR MCU as the control chip of the detection system, and adds LCD display, audible and visual alarm, serial communication and other modules. During the test, when the power supply voltage is 300 V, 500 V and 700 V respectively, keep the collected partial voltage resistance value as 20 kΩ, change the resistance value of the sliding rheostat in the test system, realize the collection of the insulation resistance network voltage, and send the data to the single chip microcomputer. After calculation, the insulation resistance value is obtained and displayed. When the insulation resistance does not meet the national standard, the buzzer alarm is triggered to achieve the warning effect. The simulation results show that the system works normally and meets the design requirements. References | Related Articles | Metrics

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Research Progress of Charging and Battery Swapping Technology for Electric Vehicles WANG Guoyuan 2022, 47(12): 5-10.  DOI: 10.16638/j.cnki.1671-7988.2022.012.002 Abstract ( )   PDF (985KB) ( )   Electric vehicles are of great significance to the construction of ecological civilization. The development of electric vehicles must speed up the construction of charging and swapping infrastructure and improve the service level of charging infrastructure.Focusing on the construction of electric vehicle charging and swapping infrastructure, the article sorts out the latest research results of charging facility location, charging and swapping, power management technology and wireless charging technology. In terms of charging facility location, it introduces the location model of taxi-specific charging stations. Based on the actual driving data of a pure electric vehicle to establish a charging facility optimization layout model, and based on the two-level planning theory of charging load demand prediction to establish a charging pile location and capacity model and a constrained probability traffic flow refueling location model. The results of power management technology are discussed. The results show that the energy optimization management model aiming at the optimization of comprehensive economic indicators has multiple solutions, and should be optimized according to the actual situation with multiple objectives and multiple stages. The energy manager should formulate flexible incentive measures to regulate user participation. Through the research, it provides a certain reference for the development of the electric vehicle charging and swapping technology field. References | Related Articles | Metrics

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Analysis of Air Cooling Heat Dissipation of Automotive Power Battery Based on Fluent WU Yong 2022, 47(12): 11-16.  DOI: 10.16638/j.cnki.1671-7988.2022.012.003 Abstract ( )   PDF (1058KB) ( )   Aiming at the problems of low and uneven heat dissipation efficiency of automotive power battery in the working process, this paper optimized the battery layout and heat dissipation air channel. Based on Fluent software, the air cooling heat dissipation simulation of square battery and cylindrical battery was carried out. The simulation results show that the heat dissipation of the square battery is more uniform by longitudinal arrangement. For square batteries, there is little difference between the heat dissipation effect of local air channel and that of the whole air channel. For cylindrical batteries, the heat dissipation effect of the whole air channel is better than that of the local air channel. The heat dissipation effect of the air inlet battery string in the center position is better than that of the air inlet in the side position. The influence of different battery arrangement and air channel on battery heat dissipation obtained in this paper can provide some help for the research of battery heat dissipation. References | Related Articles | Metrics

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Discussion on Pure Electric Concrete Mixer Truck LI Ming 2022, 47(12): 17-20.  DOI: 10.16638/j.cnki.1671-7988.2022.012.004 Abstract ( )   PDF (2596KB) ( )   In order to actively comply with the development trend of new energy technology and industry, seize the opportunity of new energy product switching, and realize the product technology upgrading of new energy concrete mixer truck. Through the research and analysis of policy development trend, market capacity and actual operating conditions of products, establish the theoretical analysis logic of policy, market and product, formulate the technical route of pure electric concrete mixer truck, study and analyze advantages and disadvantages of the technical scheme, and identified the technical path suitable for the operating conditions of products. According to the actual application of products, compare and analyze the energy consumption of new energy vehicles and fuel vehicles in the whole life cycle, and complete the product economy calculation model. In this paper, the basic product theory is studied and discussed in detail, which can be popularized and applied in the follow-up seriation product development process. References | Related Articles | Metrics

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The Layout Efficiency of Power Battery Pack in Pure Electric Vehicles LI Weijuan 2022, 47(12): 21-24.  DOI: 10.16638/j.cnki.1671-7988.2022.012.005 Abstract ( )   PDF (830KB) ( )   Due to the mileage anxiety of pure electric vehicles, how to improve the layout efficiency of power batteries in a limited space is the primary concern of all major car companies. This paper analyzes the factors affecting the battery arrangement one by one, and finally proposes the solutions to provide important theoretical reference for the arrangement and optimization of the design direction of power battery pack. References | Related Articles | Metrics

Intelligent Connected Vehicle

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The Automatic Driving Vehicles Braking System Based on Point-brake Strategy GUO Baoguang 2022, 47(12): 25-28.  DOI: 10.16638/j.cnki.1671-7988.2022.012.006 Abstract ( )   PDF (717KB) ( )   Autonomous driving vehicles need to have the ability to automatically complete the braking action, the process of precision and comfort requirements are very high, is an important index to reflect the safety of the vehicles. In this paper, the autonomous emergency braking system of the vehicles is verified based on two braking strategies by analyzing the working characteristics of the vehicle air brake system. The results show that the point-brake baking strategy can not only improve the braking accuracy, but also improve the comfort to a certain extent, improve the safety of the vehicle and the driver and passenger, and help to further accelerate the commercialization of automatic driving. References | Related Articles | Metrics

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Control Technology of BLDC Based on Fuzzy Adaptive ADRC LIU Xiangchen 2022, 47(12): 29-33.  DOI: 10.16638/j.cnki.1671-7988.2022.012.007 Abstract ( )   PDF (2207KB) ( )   Brushless DC Motor (BLDC) is a nonlinear motion system with many parameter variables and high coupling. During the operation of the vehicle, it is relatively easy to be affected by unknown disturbances. Aiming at this problem, the Fuzzy Adaptation+Active Disturbances Rejection Controller (ADRC) of the BLDC is applied in this paper, which can effectively reduce the interference of various disturbances for the stable operation of the vehicle. At the same time, it can improve the speed response of BLDC. Through simulation and experiments, this scheme can significantly improve the operability ande speed regulation of the BLDC during driving. References | Related Articles | Metrics

Design and Research

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Simulation and Optimization of the Air Volume in Cooling System of a Passenger Car CHENG Lu 2022, 47(12): 34-38.  DOI: 10.16638/j.cnki.1671-7988.2022.012.008 Abstract ( )   PDF (1439KB) ( )   In view of the problem that the air intake of cooling system can not meet the requirements when the opening area of the grille can not be increased in the design stage of a passenger car, the paper analyzes the reasons of insufficient air intake of cooling system according to the results of simulation calculation based the Star ccm+software simulating flow field in a passenger car. According to the analysis of the cloud chart of the simulation results, the improvement measures of adding the guide plate in the water tank and optimizing the guide plate on both sides of the fan are worked out to increase the air intake volume of the cooling system, which is finally verified by the hub test of the cooling system. This paper provides a solution to improve the cooling performance of passenger cars without increasing the grille opening area, and provides a reference for the development method of cooling system in the design stage of vehicle models. References | Related Articles | Metrics

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Simulation and Optimization of MacPherson Suspension Based on ADAMS/Insight KANG Xuezhong 2022, 47(12): 39-43.  DOI: 10.16638/j.cnki.1671-7988.2022.012.009 Abstract ( )   PDF (1389KB) ( )   In this paper, the MacPherson front suspension of a certain car is used as the research object, and the multi-body dynamics virtual prototype model of the McPherson front independent suspension of the car is established using ADAMS/Car, the simulation test of parallel runout of the double wheels was designed for the model. ADAMS/Insight optimizes the suspension design parameters, selects 9 hard-point coordinate values as design variables, and selects the main 5 suspension performance parameters (wheel toe-angle, etc.) as optimization targets, carries out sensitivity analysis and multi-objective optimization to obtain optimization after the hard point coordinate value. The results show that the performance of the optimized McPherson front independent suspension has been greatly improved, which has certain reference significance for the optimization design of the McPherson suspension in engineering. References | Related Articles | Metrics

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Dynamic Reliability Optimization Design of Automobile Drum Brake HE Ning 2022, 47(12): 44-51.  DOI: 10.16638/j.cnki.1671-7988.2022.012.010 Abstract ( )   PDF (956KB) ( )   Taking the dynamic reliability of the drum brake as one of the constraints of the three elements of its optimal design can solve the problems of the decline of the life and braking reliability of the drum brake in long-term use. The relationship among the braking reliability, braking distance and braking time of drum brake is obtained from the road test standard, and the time-varying reliability constraint condition is constructed. The new weighted coupling function of the drum brake with the largest braking efficiency factor and the lowest braking temperature rise was taken as the objective function of the mathematical model of its optimization design. Taking the support pin drum brake as an example, the mathematical model of optimization design established above is used, and the genetic operator particle swarm optimization algorithm program written based on MATLAB is used to optimize the solution. The optimization results show that: after optimization, the braking efficiency factor of the brake is 12.20% higher than that before optimization, and the temperature rise of the brake is 13.59% lower than that before optimization. References | Related Articles | Metrics

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Stability Tuning and Subjective Evaluation of a Hybrid Vehicle ZHANG Duanjun 2022, 47(12): 52-56.  DOI: 10.16638/j.cnki.1671-7988.2022.012.011 Abstract ( )   PDF (958KB) ( )   A hybrid electric vehicle is designed and equipped with electric systems such as battery and electric drive system on the basis of the traditional fuel vehicle architecture. Due to the change of mass distribution and centroid position, the rear axle of the vehicle is unstable and prone to out of control. In order to solve the problem of vehicle stability, the hard spot position and stiffness of chassis parts are changed, the subjective evaluation of the changed vehicle is carried out, and the stability of the vehicle is greatly improved. Finally, according to the conclusion of this paper, the solution to the problem of vehicle stability is given. The conclusion of this paper can provide a reference for the chassis tuning. References | Related Articles | Metrics

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Analysis and Solution of Eccentric Tire Wear of an Export Heavy Truck HUANG Zhonghua 2022, 47(12): 57-60.  DOI: 10.16638/j.cnki.1671-7988.2022.012.012 Abstract ( )   PDF (752KB) ( )   After a heavy truck was exported to Zambia for the first time, a batch of tire eccentric wear failure occurred, which greatly shortened the service life of tires and increased the cost of vehicle use, and the customer complained strongly. Starting from the occurrence mechanism of tire eccentric wear fault, this paper identifies the influencing factors, determines the important cause, makes the optimal plan, finally eliminates the fault, and summarizes a set of tire eccentric wear fault design prevention and process control methods, designed to guide subsequent product development. References | Related Articles | Metrics

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An Optimized Structure of the Rear Processor Bracket ZHANG Li 2022, 47(12): 61-63.  DOI: 10.16638/j.cnki.1671-7988.2022.012.013 Abstract ( )   PDF (930KB) ( )   The thermoforming technology of ultra-high strength steel plates is one of the important ways to realise the lightweighting of vehicles. The paper adopts the optimisation method of thinning ultra-high strength steel plates to optimise the structure of a heavy truck rear processor bracket for the characteristics of the thermoforming process, and verifies the structural strength requirements after optimisation with the help of Hyperworks, reducing the number of parts and reducing the weight by 37.5%, achieving the goal of lightweight design and improving production efficiency. References | Related Articles | Metrics

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A Solution of Gear Fatigue Fracture Based on CAE and DFSS Methods DING Kai 2022, 47(12): 64-71.  DOI: 10.16638/j.cnki.1671-7988.2022.012.014 Abstract ( )   PDF (2927KB) ( )   In order to solve the problem of bending fatigue fracture of the main reduction gear of a hybrid transmission in bench endurance test, the failure cause was determined and three measures were implemented through CAE and test comparison and fracture analysis. The simulation model based on MASTA software has been updated through carefully taking stiffness of abnormal gear shaft into account. Effect of stiffness change along circumferential direction on the gear fatigue strength has been studied, and simulated gear contact pattern matched test result now. A test standard which is suitable for this hybrid transmission is build. Taking stiffness of abnormal gear shaft as noise, design for six sigma method is used to design a high robust gear pair. The way to consider abnormal shaft, the method to build new dyna test standard and the procedure to design gear in this paper can be meaningful to engineering application of gear design. References | Related Articles | Metrics

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The Design of a Side Protection System for Long Head Heavy Truck YANG Long 2022, 47(12): 72-76.  DOI: 10.16638/j.cnki.1671-7988.2022.012.015 Abstract ( )   PDF (1615KB) ( )   As an important part of the long head heavy truck, side protection is greatly limited by many factors such as chassis empty question, modeling effect, convenience of disassembly and assembly, and the harsh working conditions of the whole vehicle position, the design is much more difficult. The paper discusses the design study of side protection system at long head heavy truck. It recites the design requirements and structural design process of the side protection system. Finally, the structural performance and failure modes of side protection system are described. It provides reference and methods for the design and development of side protection systems. References | Related Articles | Metrics

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Vehicle Safety Strategy Based on a Start Stop Control System LI Yulong 2022, 47(12): 77-82.  DOI: 10.16638/j.cnki.1671-7988.2022.012.016 Abstract ( )   PDF (1273KB) ( )   Based on the design and development of the start stop control system for a national sixth production vehicle, this paper carries on the whole vehicle safety strategy analysis and verification, introduces the start stop control principle, and through the input and output signal analysis of the system, finally carries on the verification and test on the six vehicles in the mass production, to meet the safety requirements of the whole vehicle design. Under the condition of meeting the starting and stopping conditions and control strategies, the whole vehicle can smoothly realize the starting and stopping functions according to the input signals, in the case of not meeting the starting and stopping control requirements, the vehicle will immediately stop the starting and stopping operations, realizing the safety control of starting and stopping the whole vehicle. References | Related Articles | Metrics

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Cause Analysis and Improvement of Exhaust System Whistling of a Vehicle LIU Guobin 2022, 47(12): 83-88.  DOI: 10.16638/j.cnki.1671-7988.2022.012.017 Abstract ( )   PDF (3373KB) ( )   During the development of a front engine front drive SUV, there is a clear whistling sound in the car with engine speed over 4 000 r/min under full throttle acceleration. After investigation tests and computational fluid dynamics analysis of the front muffler, it is determined that the whistling is caused by an opening in the intubation of the front muffler. Combining with the results of computational fluid dynamics analysis, the optimization scheme is proposed and verified on the real vehicle. It is proved that the whistling is improved significantly, which provides a reference for solving similar problems. References | Related Articles | Metrics

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Solving the Problem of a SUV Hub Fracture Based on the Analysis of the Locking Force of the Drive Shaft ZHU Yawei 2022, 47(12): 89-93.  DOI: 10.16638/j.cnki.1671-7988.2022.012.018 Abstract ( )   PDF (2005KB) ( )   In order to solve the problem of the front disc brake hub fracture during the road test test in the development process of the brake of a certain SUV model, the authors carried out the wheel hub fracture electrostatic scanning detection, material chemical composition, metallographic structure, dynamic the simulated loading state moment loading, bearing locking force bench test, etc.. The results show that the bearing locking force actually provided by the actual vehicle drive shaft cannot reach the locking force required by the theoretical calculation of the bearing. In the process of road test and handling stability test, the tire is microscopically eight-shaped in the Y direction of the whole vehicle. The wheel acts as the focal point, and the bearing squeezes the matching end face of the wheel hub. With the rotation of the wheel, a step is gradually formed, and the wheel hub is fatigued fracture. By optimizing the bearing locking torque and improving the bearing axial locking force, the wheel hub fracture of this model is well controlled and meets the design requirements. References | Related Articles | Metrics

Testing and Experiment

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Analysis on Collision Characteristics of Rear Underside Protection of Commercial Vehicles PAN Xing 2022, 47(12): 94-96.  DOI: 10.16638/j.cnki.1671-7988.2022.012.019 Abstract ( )   PDF (1238KB) ( )   As a representative part of passive safety device for commercial vehicles, the rear underside protection of commercial vehicles is a standard product required by regulations. With the comprehensive implementation of vehicle laws and regulations in China and the advancement of vehicle passive safety research, at present major OEMs and modification plants have carried out special research on the rear underside protection materials and structures of commercial vehicles. In this paper, the high strength steel rear underside protection of a commercial vehicle is taken as the research object, and its anti-collision characteristics are analyzed to verify that its collision performance meets the requirements of laws and regulations. The front and bottom protection of high strength steel rolled profile is designed, and its strength meets the requirements of laws and regulations through the analysis to effectively guarantee the safety of commercial vehicles. References | Related Articles | Metrics

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Corrosion Resistance Test of Vacuum Booster with Brake Master Cylinder Assembly ZHU Tao 2022, 47(12): 97-100.  DOI: 10.16638/j.cnki.1671-7988.2022.012.020 Abstract ( )   PDF (1332KB) ( )   With the development of automobile industry, corrosion resistance test plays an important role in test and detection. This paper through the evaluation and analysis of corrosion resistance test, studying whether the vacuum booster with brake master cylinder assembly meets the corrosion resistance test standard. Based on the standard QFC-CA04-005-2015 Vacuum Booster with Brake Master Cylinder Assembly, use salt spray corrosion test chamber, high and low temperature alternating test chamber and high and low temperature performance test bench for vacuum booster to complete the test. The results showed that when the sample is tested under 8 826 N heavy load strength test on the performance test bench, the adjust the fork is damaged. After the analysis of corrosion resistance test data, draw the test conclusion:no less than 15% red rust and 2% corrosion resistance test samples, which led to their failure to withstand the test thrust of 8 826 N. Based on this, the author puts forward some specific suggestions to the competent authorities, it is hoped to provide reference for improving the corrosion resistance of vacuum booster with brake master cylinder assembly. References | Related Articles | Metrics

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Comparisons of Two Test Methods for Energy Consumption and Driving Range of Light-duty Vehicles MA Zhicheng 2022, 47(12): 101-106.  DOI: 10.16638/j.cnki.1671-7988.2022.012.021 Abstract ( )   PDF (1937KB) ( )   This article compares and analyzes the test methods of GB/T 19753—2013 and GB/T 19753—2021 for the energy consumption of plug-in hybrid electric vehicles (PHEV) from the aspects of test conditions, test process and calculation methods, as well as GB/T 18386—2017 and GB/T 18386.1—2021 two kinds of blade electric vehicles (BEV) energy consumption and driving range test methods. 5 light-duty plug-in hybrid electric vehicles and 5 light-duty pure electric vehicles were tested respectively, and the changes in driving range, energy consumption and weighted fuel consumption were compared and analyzed. The effects of switching test methods on the test results of plug-in hybrid electric vehicles and pure electric vehicles are summarized. References | Related Articles | Metrics

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Optimization and Control of Accelerated Vibration of an MPV Floor CHEN Xiang 2022, 47(12): 107-113.  DOI: 10.16638/j.cnki.1671-7988.2022.012.022 Abstract ( )   PDF (1762KB) ( )   In this paper, aiming at the problem of excessive vibration of the floor when the floor is accelerated to 3 560 r/min during the development of an MPV model, the vibration transmission path is analyzed and the vibration data of the floor and the components of the transmission path are collected. The frequency spectrum analysis confirms that the vibration source is the second-order excitation of the engine vibration, the transmission path is the right drive shaft subsystem of the transmission system. The modal test and analysis of the right drive shaft system were further carried out, and it was confirmed that the vibration frequency was the second-order modal frequency of the drive shaft system that had implemented the single-stage dynamic vibration absorber. Under the condition that the structure of the floor and drive shaft components cannot be changed, an improvement plan for the two-stage dynamic vibration absorber is proposed, and the mathematical theoretical models of the single-stage and two-stage dynamic vibration absorber are compared and analyzed. The simulation calculation of the frequency response function of the system before and after optimization predicts the effectiveness of the optimization scheme. Finally, the prototype was trial-produced and the vehicle in question was carried for comparative testing. The results showed that the floor vibration problem was significantly improved and the accuracy of the simulation results was confirmed. References | Related Articles | Metrics

Process and Equipment

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Dynamic Grasping Application of Belt Workpiece Based on Machine Vision XIAO Yongqiang 2022, 47(12): 114-119.  DOI: 10.16638/j.cnki.1671-7988.2022.012.023 Abstract ( )   PDF (1519KB) ( )   In order to improve the success rate of robot grasping dynamic workpiece, a dynamic workpiece grasping method of conveyor belt based on machine vision is proposed. Firstly, the system scheme is designed, and the system design goal is expounded.Secondly, the camera debugging, coordinate system calibration and grab point calibration are described and the camera installation target is summarized. The process of coordinate system calibration and grab point calibration is introduced. The grab point is re-calibrated by coordinate system conversion.At the same time, the main interface, TCP communication interface, conveyor belt calibration interface and offset grab point calibration interface are designed, and the pixel resolution calibration interface parameters, the main interface variable parameters of RDE and TPU interaction and Module instruction parameters are explained, which have certain application value. References | Related Articles | Metrics

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Working Principle of Heavy Truck Wiper and Troubleshooting of Electrical Equipment YANG Shuotian 2022, 47(12): 120-124.  DOI: 10.16638/j.cnki.1671-7988.2022.012.024 Abstract ( )   PDF (1404KB) ( )   Wiper system is not only an important part of comfortable driving, but also a main safety device in the process of driving. This paper mainly introduces the main electrical components of the wiper system on heavy truck, the working principle of the electrical framework, and the troubleshooting ideas and methods of abnormal wiper function. Combined with the actual fault phenomenon of the whole vehicle, this paper expounds the fault analysis and solution ideas by using professional electrical technology, so as to provide reliable and feasible maintenance solutions for abnormal wiper function. References | Related Articles | Metrics

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Application Analysis of Welded Pipes in a Commercial Vehicle Field ZHANG Lei 2022, 47(12): 125-128.  DOI: 10.16638/j.cnki.1671-7988.2022.012.025 Abstract ( )   PDF (1538KB) ( )   Welded pipes with the production of convenience, high efficiency, complex section characteristics of machinability quickly occupy the market. In order to study the application of welded pipes in commercial vehicles, the paper analyzes and researches welded pipe and seamless pipe production process, surface quality and machining performance and dimensional accuracy, discusses the feasibility in the commercial vehicle using welded pipe instead of seamless pipe. The results show that the welded pipe has the advantages of good appearance quality and high dimensional accuracy, and can be used instead of seamless pipe under certain conditions, and can also improve the consistency and lightweight effect of the product. References | Related Articles | Metrics

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Application of Smoke Exhaust and Dust Removal System for Automobile Arc Welding to New Fire Prevention and Extinguishing XU Xiaolei 2022, 47(12): 129-132.  DOI: 10.16638/j.cnki.1671-7988.2022.012.026 Abstract ( )   PDF (1705KB) ( )   The arc welding smoke exhaust and dust removal system used in the automobile welding workshop is easy to catch fire due to the working environment. After a fire, it is difficult to eliminate the fire source in time due to the closed structure of the smoke exhaust and dust removal system, which brings great economic losses and potential safety hazards to the production and operation of the enterprise. In this paper, the two difficult problems of easy ignition and difficult fire extinguishing of the traditional arc welding smoke and dust removal system are analyzed and studied. With reference to the latest achievements in the field of fire prevention and fire extinguishing in China, the anti ignition structure of the traditional smoke and dust removal system is technically improved. At the same time, a new technology of adding automatic fire extinguishing structure to the original smoke and dust removal system is designed. The upgraded and improved fire prevention structure can further reduce the fire probability of the arc welding smoke exhaust and dust removal system, and the automatic fire extinguishing system can find the fire source in time after a fire, so as to realize automatic fire extinguishing and eliminate the fire source. References | Related Articles | Metrics

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Analysis of Electrical System Faults of a Heavy Duty Automobile ZHANG Yunfei 2022, 47(12): 133-135.  DOI: 10.16638/j.cnki.1671-7988.2022.012.027 Abstract ( )   PDF (1615KB) ( )   As an important carrier of automotive electrical system, wire harness plays an important role in the realization of various electrical functions. This paper briefly describes the composition of automotive electrical wiring harness, and focuses on five commom wiring harness failure modes in vehicle assembly. Combined with work experience for each failure mode’s generation mechanism and control measures to do in-depth analysis, for the automotive wiring harness processing, assembly and fault repair has a strong reference significance. The improvement of vehicle wiring harness quality is a systematic engineering, which needs to control the quality of wiring harness design, processing, distribution and assembly, and ultimately improve the quality stability of vehicle electrical appliances. References | Related Articles | Metrics

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Analysis and Improvement on the Fracture of Spisral Spring for a Suspension HAN Jianwei 2022, 47(12): 136-140.  DOI: 10.16638/j.cnki.1671-7988.2022.012.028 Abstract ( )   PDF (5077KB) ( )   In view of the fracture of the suspension spiral spring occurred in the truck production process, through the establishment of the fault tree to identify the risk event and the item-by-item analysis of the identification bottom event, it is determined that the technological process is not perfect and the production process does not meet the process requirements. The overwear phenomenon occurs in the end face grinding, and the rectification measures are adopted to reduce the end face cutting amount of the spiral spring, increase the tempering process and refine the grinding process parameters. The fatigue test of the improved product is carried out, the problem of end face fracture of the spiral spring is solved, and the performance and service life of the spiral spring are improved. References | Related Articles | Metrics

Automobile Education

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The Course Reform of Automobile Sales Practice JIANG Wei 2022, 47(12): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2022.012.029 Abstract ( )   PDF (918KB) ( )   Automobile sales practice is a core course with high requirements for students' skills in the automobile marketing major. Due to many problems in the teaching process, the quality of graduates cannot meet the employment standards of automobile sales enterprises. The article puts forward reform suggestions for the practical courses of automobile sales from four aspects of teaching content, teaching means, teaching methods and assessment mode, and explores for vocational colleges to cultivate skilled talents more in line with the job needs of automobile sales enterprises. References | Related Articles | Metrics

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The Research and Practice on OBE Model Applied Talent Training System LUO Tian 2022, 47(12): 145-148.  DOI: 10.16638/j.cnki.1671-7988.2022.012.030 Abstract ( )   PDF (1066KB) ( )   Based on the research on the training characteristics of emerging engineering education talents and the OBE achievement-oriented education concept, this paper updates the quality and ability training requirements of automotive engineering talents oriented by changing needs and based on industrial adjustment, coordinates the innovative approach of multi-disciplinary cross-integration and industry-university-research, deeply explores new teaching modes, curriculum innovation systems, and teaching reform methods in applied undergraduate colleges and universities. Through practice, this paper summarizes the design concept of the result-oriented automotive engineering application-oriented talent training teaching system under the background of new engineering, takes demand-oriented "reverse design" curriculum teaching system and knowledge structure to reflect the connotation and characteristics of multi-disciplinary cross-integration of new engineering knowledge structure, perfects teaching supervision mechanism to achieve continuous improvement. The three employment evaluations have proved that the new teaching concept and talent training system can better highlight the student-oriented and ability-based teaching characteristics, and the students' innovative consciousness and innovative ability have been significantly improved. References | Related Articles | Metrics

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The Construction Standard and Mode of Industry Education Integrated Training Based on Vocational Colleges —Taking the Major of New Energy Vehicle Technology as an Example ZHU Kening 2022, 47(12): 149-153.  DOI: 10.16638/j.cnki.1671-7988.2022.012.031 Abstract ( )   PDF (987KB) ( )   In order to explore the construction standard and mode of the industry education integrated training base in vocational colleges, taking the new energy automobile technology specialty as an example, this paper analyzes the necessity of the construction of the industry education integrated training base in vocational colleges, highlights the significance of the construction of the industry education integrated training base, and focuses on the problems faced by the construction of the industry education integrated training base. The results show that the supply and demand of the industry education integrated training base do not match, the basic contradiction is "teaching" and "production". This result shows that it is necessary to establish the construction standard and mode of production teaching integrated training base, reasonably plan the training and teaching of student training base, create a first-class teacher team, introduce double qualified talents, promote the coordinated operation of "production" and "teaching", establish a diversified mixed teaching mode, improve the competitiveness of graduates, and introduce the talent training standard of enterprises into colleges, Make the talent training of vocational colleges more targeted. References | Related Articles | Metrics

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Teaching Reform and Practice of Integrating Craftsman Spirit into Automobile Culture Course YANG Kang 2022, 47(12): 154-157.  DOI: 10.16638/j.cnki.1671-7988.2022.012.032 Abstract ( )   PDF (915KB) ( )   Nowadays, craftsman spirit has gradually become a value concept that all workers in the new era should have, and this fits the requirements of the ideological and political content teaching of automobile culture courses. This article firstly introduces the problems existing in the current development of automobile culture courses. Secondly, it outlines the teaching reforms and practical measures that incorporate the craftsman spirit. Finally, it concludes that with the craftsman spirit in the car culture, the continuous integration in the curriculum will greatly improve the moral quality and professional quality of automotive professionals in the future. References | Related Articles | Metrics

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Ideological and Political Design and Reflection of Automobile Body Repair Technology Course LI Hua 2022, 47(12): 158-161.  DOI: 10.16638/j.cnki.1671-7988.2022.012.033 Abstract ( )   PDF (907KB) ( )   Higher vocational education is the main way to cultivate skilled talents in China. To cultivate high skilled talents in line with the needs of our country, we must implement the ideological and political education. The traditional ideological and political education is mainly based on the ideological and political education curriculum. The simple ideological and political education curriculum has been faced with many difficulties. Students' interest in learning ideological and political education course is not high, and the learning effect is poor. Based on the analysis of the current situation of higher vocational education, this paper designs a set of curriculum content of ideological and political education on the basis of learning professional basic knowledge, organically combines professional knowledge education curriculum and ideological and political education curriculum, and carries out ideological and political education and professional knowledge learning at the same time, so as to cultivate excellent talents meeting the needs of our country. This paper takes automobile body repair technology course as an example to provide an innovative idea for integrating into ideological and political education course. References | Related Articles | Metrics

Standards Regulations Management

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OBD Test of Light Truck Based on the Emission State Standards VI ZHAO Xiangli 2022, 47(12): 162-166.  DOI: 10.16638/j.cnki.1671-7988.2022.012.034 Abstract ( )   PDF (1712KB) ( )   This paper describes the verification of on-board diagnostic system for light national Ⅵ gasoline vehicles in combination with national standards. Through systematic sorting and classification, the verification of on-board diagnostic system is divided into two categories: static on-board diagnostic system verification and dynamic on-board diagnostic system verification, and the overall verification process is established to verify the vehicle inspection, static on-board diagnostic system verification content, dynamic on-board diagnostic system verification content and some system principles, the key inspection contents of the whole vehicle, such as the inspection list of the whole vehicle and the information checklist of key environmental protection parts, are established, and the solutions to the problems of high exhaust temperature caused by heavy engine load when the light national VI gasoline vehicle is running and abnormal pollutants caused by burning the exhaust gas collection connecting hose in the laboratory are described. The verification method described in this paper is used to verify the vehicle, which can effectively improve the verification efficiency,accuracy and integrity of on-board diagnostic system verification. References | Related Articles | Metrics

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Supplier Quality Management in Automobile Product Project Management HUANG Yuhuan 2022, 47(12): 167-170.  DOI: 10.16638/j.cnki.1671-7988.2022.012.035 Abstract ( )   PDF (945KB) ( )   As an important link of automobile production, the production of auto parts should be paid special attention to ensure the quality of automobile products. In view of this, this article has carried on the analysis to the automobile product project management supplier quality management, first has outlined separately the automobile product project management and the supplier management theory foundation, then it analyzes the current situation of the supplier management in the general automobile product project management in our country, finds out the existing problems, finds the relevant data and materials, finaly combines the factors of the times, and gives a more scientific strategy, the aim is to improve the quality of automotive product project management suppliers, improve the overall quality of vehicles. References | Related Articles | Metrics

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Discussion on Automatic Start-stop Technology of Commercial Vehicles WANG Kun 2022, 47(12): 171-175.  DOI: 10.16638/j.cnki.1671-7988.2022.012.036 Abstract ( )   PDF (1076KB) ( )   In order to meet the increasingly strict fuel consumption limit requirements of the country and reduce the fuel consumption of products, the commercial vehicle industry began to explore and study the automatic start-stop technology. The design of the engine start and stop system shall not change the normal driving habits of the driver during the action as much as possible. The start and stop system shall be opened or closed through the start and stop switch. When the system has no fault and meets the shutdown conditions, the engine shall be stopped. When the driver gives a request and meets the system restart conditions, the engine shall be restarted. During the engine start and stop, the working state of the system shall be displayed through the vehicle instrument.This paper introduces a design scheme of automatic start and stop technology matching the commercial vehicle platform, and introduces in detail the definition, working state, logical relationship, man-machine interface, starting and stopping conditions and operation requirements of the automatic start and stop system. The article also describes in detail the conditions for stopping and restarting the start stop system, the conditions for restarting without the driver's will and the main monitoring faults of the system. Some working conditions are unique to commercial vehicles, which are different from passenger vehicles, so special attention should be paid to the matching of the system. References | Related Articles | Metrics

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The Objective Target Setting of There-row SUV’s Luggage Room DAI Xiaoyan 2022, 47(12): 176-179.  DOI: 10.16638/j.cnki.1671-7988.2022.012.037 Abstract ( )   PDF (1384KB) ( )   The luggage room of three-row SUV is very limited when it is fully seated, so how to design it reasonably is very important. According to the definition of luggage room in the SAE standard and GB, combining with the luggage room size and actual storage capacity of three-row SUV in the market, proposed the objective target setting recommendation table of three-row SUV luggage room, which provides an important basis for the development of new vehicle. References | Related Articles | Metrics

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Comparison of Selection of Positive Pressure Leak Test Media for Automobile Air Conditioning System LI Yueming 2022, 47(12): 180-184.  DOI: 10.16638/j.cnki.1671-7988.2022.012.038 Abstract ( )   PDF (1123KB) ( )   With the continuous development of production technology, the vehicle manufacturing industry has put forward higher requirements for the test means of air conditioning system, and the positive pressure leak test has been applied in more and more vehicle enterprises, but the leak test media are diverse, and there is no unified reference standard for the selection of leak test media. This paper takes helium, nitrogen and compressed air, three leak test media mainly used by automobile enterprises, as the research object, through the analysis method combining theory and practice, aims to improve the efficiency of the selection of positive pressure leak test media in the air-conditioning system of each vehicle enterprise, and reduce the production cost. In this paper, from comprehensive comparative analysis of five aspects, such as the principle of positive pressure leak test, the application of positive pressure leak test media, test specifications, test equipment capacity and leak test cost, finds out the advantages and disadvantages of different leak test technology, to provide reference for the medium selection of vehicles and enterprises and derives optimal conclusions. References | Related Articles | Metrics