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30 March 2022, Volume 47 Issue 6 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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Simulation of Power Battery Pack Heat Dissipation Based on COMSOL Multiphysics HUANG Xiwei 2022, 47(6): 1-9.  DOI: 10.16638/j.cnki.1671-7988.2022.006.001 Abstract ( )   PDF (4813KB) ( )   In view of the difficulty in heat dissipation of battery pack of pure electric vehicle, based on COMSOL Multiphysics software simulation platform, the 18650 cylindrical lithium-Ion battery was taken as the research object to establish the thermal model of power battery pack, and different heat dissipation schemes were compared and studied. Taking the maximum temperature and temperature difference of the battery pack as reference, the battery working condition was simulated by changing the discharge rate, and the heat dissipation performance of the battery pack was analyzed and compared under three schemes: natural cooling with different air supply modes, forced cooling with different convection heat transfer coefficient and inlet wind speed. The results show that the serial channel structure is superior to the parallel channel structure for the natural cooling of the battery pack at low discharge rate. When the discharge rate is high, the power battery pack should adopt forced cooling for heat dissipation. The high inlet wind velocity under forced cooling can effectively improve the heat dissipation performance of the battery pack. This provides an important reference for the selection of the supply air channel structure of the power battery pack and the setting of the inlet air velocity of the heat dissipation system. References | Related Articles | Metrics

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Analysis of Range-extended Electric Vehicle Dedicated Engine Technology WANG Jinyan 2022, 47(6): 10-13.  DOI: 10.16638/j.cnki.1671-7988.2022.006.002 Abstract ( )   PDF (2125KB) ( )   With the global energy crisis and the pressure of carbon emissions, the research and development of energy-efficient vehicle in the automobile industry is imminent. The Range-extended electric vehicle is a series hybrid. In the extended range vehicle, the engine does not directly drive the vehicle, but only drives the generator to generate electricity. The engine speed and vehicle speed are completely decoupled. Therefore, the working point of the engine can be controlled in the area with higher combustion efficiency to achieve the energy saving and emission reduction of the vehicle. This paper analyzes the working characteristics of extended range engine, and summarizes the technical trend of extended range electric vehicle special engine through the techni- cal analysis of Nissan E-Power engine, which is a typical extended range model, so as to provide reference for the researchers of extended range engine products. References | Related Articles | Metrics

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The Test Method of Equalization Strategy in BMS YANG Fasong 2022, 47(6): 14-17.  DOI: 10.16638/j.cnki.1671-7988.2022.006.003 Abstract ( )   PDF (1281KB) ( )   With the development of new energy industry, lithium batteries are widely used in automobile, energy storage, communication base station and other fields, and the control of lithium batteries is getting more and more sophisticated. Among them, the equilibrium strategy of battery management system can ensure that the lithium battery pack can avoid the safety problems caused by the different internal monomer potential, so it needs to be tested and verified in detail. This paper introduces a test and verification system for passive equilibrium strategy that based on the battery management system hardware in loop system, and the purpose for this system is to check BMS can balance the cell whose potential is different. This method can be used to test and verify all kinds of passive equalization opening and closing to meet the design requirements. References | Related Articles | Metrics

Intelligent Connected Vehicle

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A Detection System for Road Surface Slippery Condition Based on Convolutional Neural Networks HUANG Lihong 2022, 47(6): 18-21.  DOI: 10.16638/j.cnki.1671-7988.2022.006.004 Abstract ( )   PDF (1732KB) ( )   A detection system for road surface slippery condition is proposed by using the road surface wet state identification method based on transfer learning and the segmentation method for road water area based on full-resolution residual network to identify the road surface slippery condition and segment road water area. First, the proposed detection system is designed to identify four types of asphalt road surface conditions, including dry, wet, puddle, and waterlogged. Second, according to the waterlogged road surface identified by the detection system, the water area of the waterlogged road is segmented. Finally, the experiment is performed under various weather conditions. The results show that the designed detection system for road surface slippery condition can accurately, effectively, and real-time detect the asphalt road surface conditions under different illumination variations and various climate conditions. References | Related Articles | Metrics

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Design of Adaptive Cruise Control System and Hardware-in-the-Loop Simulation HUANG Peng 2022, 47(6): 22-27.  DOI: 10.16638/j.cnki.1671-7988.2022.006.005 Abstract ( )   PDF (1364KB) ( )   In order to improve the smoothness of mode switching of adaptive cruise control (ACC), and carry out hardware in the loop simulation (HILS) test for the real-time performance and stability of the algorithm, firstly, based on the optimal control and the inverse longitudinal vehicle dynamics model, an adaptive cruise control system composed of upper and lower controllers is designed, secondly, the hardware-in-the-loop simulation platform is built by using the SCALEXIO real-time simulation simulator from dSPACE Company, and finally the controller hardware-in-the-loop simulation test is carried out for the typical ACC working conditions. The test results show that the hardware-in-the-loop test platform works well and is suitable for the development and testing of ACC controllers, and can be further applied to other driving assistance systems.When the target vehicle information jumps and the speed of the target vehicle changes, the designed ACC controller can adapt to complex and changeable traffic scenarios, enabling the self-vehicle to stably follow the preceding vehicle while ensuring a safe following distance, and to smoothly switch between the distance control mode and the speed control mode when the set conditions are met, improving comfort for passengers in the vehicle. References | Related Articles | Metrics

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Cooperative Adaptive Cruise System Relying on 5G Communication LEI Jiahao 2022, 47(6): 28-31.  DOI: 10.16638/j.cnki.1671-7988.2022.006.006 Abstract ( )   PDF (1378KB) ( )   The response speed of the vehicle adaptive cruise system cannot take into account both traffic efficiency and safety in high-speed cruise. From the perspective of intelligent network connection, the control information required by the vehicle during cruising can be transmitted in real time in the traffic flow. By integrating VANET based on 5th Generation Mobile Communication Technology (5G) into the vehicle adaptive cruise system, a collaborative adaptive cruise system based on 5G related control methods are proposed. The method can synchronize the communication of vehicle status information to the shared information of other vehicles in the area in real time. Experimental results show that the low latency, high bandwidth and excellent user access support characteristics of 5G can be effectively applied to the adaptive cruise control system to improve the speed response of the vehicle and reduce the distance between the vehicles. References | Related Articles | Metrics

Design and Research

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Study on Water Cooling System Structure of Lithium-ion Battery Pack Based on AMESim LIU Keyan 2022, 47(6): 32-35.  DOI: 10.16638/j.cnki.1671-7988.2022.006.007 Abstract ( )   PDF (1209KB) ( )   The heat dissipation of lithium-ion battery pack has been an important factor affecting the power performance and safety of electro mobile. In this paper, a one-dimensional simulation model of liquid cooling system of lithium-ion battery pack was built based on AMESim software, in order to explore the effect of different cooling pipeline designs on the heat dissipation of lithium-ion battery pack. By comparing and analyzing the cooling effect of four different cooling structures, it is found that the maximum temperature and temperature difference of 4th structure are the lowest and the cooling effect is the best. The results show that the position of inlet and outlet of the flow passage, the branching situation of each branch and the contact area of the flow passage and the battery pack have different degrees of influence on the heat dissipation performance of the battery pack. The cooling effect of the battery pack can be significantly improved, the maximum temperature of the battery pack can be reduced, and the temperature uniformity of the battery pack can be improved by reasonable flow passage arrangement. This provides a reference for the structure design of liquid cooling system of lithium-ion battery. References | Related Articles | Metrics

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Development of Automatic Measurement Program for Movement Clearance of Suspension Parts DUAN Wei 2022, 47(6): 36-42.  DOI: 10.16638/j.cnki.1671-7988.2022.006.008 Abstract ( )   PDF (1005KB) ( )   Aiming at the problem of measuring the movement clearance of parts in CATIA suspension motion model in the automotive design industry, in order to change the manual measurement method using the sensor and measurement function of CATIA in the industry at present, this paper provides a method for the secondary development of CATIA using Visual Basic. Using VB program to call CATIA automation object, the movement clearance of suspension parts is measured automatically, and drawn into a curve diagram. The output results of this method can fully meet the requirements of gap measurement and graph drawing in the industry, and the manual work can be transformed into automatic work. It makes the output more standardized, reduces the workload and improves the work efficiency. References | Related Articles | Metrics

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Analysis on Potential Failure of Gas Vehicle Exhaust Gas Re-circulation in Cold Area YUAN Zhihong 2022, 47(6): 43-46.  DOI: 10.16638/j.cnki.1671-7988.2022.006.009 Abstract ( )   PDF (1413KB) ( )   China's six stage natural gas engine adopts the technical route of combining three-way catalytic converter and theoretical air-fuel ratio. Compared with the fifth stage lean combustion in China, the heat load and knock in the cylinder are significantly increased, and the fuel gas consumption is also significantly increased. In order to improve the heat load and knock of natural gas engine and improve the fuel economy, the exhaust gas re-circulation system is introduced into natural gas engine. The main component of natural gas is methane. After combustion, the moisture content in the engine exhaust is high. In extremely cold environment, after the exhaust gas is cooled by exhaust gas re-circalation (EGR) cooler and enters the intake system, there may be potential failure modes of icing in the exhaust gas re-circulation valve, gas mixer, throttle and other parts. This paper introduces the causes of icing after adding exhaust gas re-circulation system, vehicle operation performance and cold zone test verification components, so as to identify the reliability risk in advance and ensure the reliable operation of vehicles in extremely cold environment. References | Related Articles | Metrics

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Analysis on Weld Cracking and Improvement of Vehicle Hydraulic Tank Bracket NING Houyu 2022, 47(6): 47-51.  DOI: 10.16638/j.cnki.1671-7988.2022.006.010 Abstract ( )   PDF (3866KB) ( )   The root weld of a hydraulic tank of a heavy special vehicle is cracked, which seriously affects the driving safety of the vehicle. In order to find out the cause of weld cracking of the bracket, the finite element method is used to analyze the stiffness and strength of the bracket under three typical working conditions. The results show that there is a great risk in the stiffness and strength of the bracket under three working conditions. Improving the design of bracket structure changes the bracket structure shape, material and plate thickness. The simulation results show that the stiffness and strength of the bracket structure are greatly improved after the improvement. Through the structural improvement design, the stress and deformation of the bracket are improved to avoid the risk of insufficient strength caused by the limitation of structural design, which has a good guiding significance for engineering design. References | Related Articles | Metrics

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Wiper System Package Stratyge ZHAN Zesheng 2022, 47(6): 52-55.  DOI: 10.16638/j.cnki.1671-7988.2022.006.011 Abstract ( )   PDF (1182KB) ( )   In order to improve the package efficiency of vehicle structure integration, and solve the key and difficult problems such as exposed wiper and excessive cover of interior rearview mirror, shorten the vehicle product development cycle and improve the efficiency of new product development, we research on the layout strategy of wiper system and take wiper, regulatory requirements, styling features, pedestrian safety, front view camera and other intelligent driving modules as well as perception quality into overall consideration. This paper shares the design experience value of wiper and surrounding parts. After years of optimization and practical verification, the optimal design strategy of wiper system package has been formed and applied in many productions. The layout strategy of wiper system formed in this paper solves many hard technical problems of upper body package and improves the structural integration efficiency of vehicle integration. References | Related Articles | Metrics

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Noise Reduction Research of the Air Compressor of a Range-extend Automobile YUN Weiguo 2022, 47(6): 56-60.  DOI: 10.16638/j.cnki.1671-7988.2022.006.012 Abstract ( )   PDF (1709KB) ( )   In response to the problem of excessive noise from an air compressor of an incremental vehicle and poor subjective perception inside and outside the cabin, the paper designs a basic model of the expansion chamber in combination with the vehicle layout space, and carries out simulation analysis and optimisation of its noise characteristics to obtain an expansion chamber design solution with the best noise reduction effect. The expand chamber was produced based on the optimized model, and the interior and exterior noise of the light truck cab was tested with the optimized expand chamber installed. The test results showed that the interior noise of the cab was reduced by 11.3 dB(A), while the end noise of the intake pipe was reduced by 11.2 dB(A). More importantly, subjective evaluation is very good. Otherwise the surface vibration of the vertical intake pipe was reduced by 75.8%, which have a great contribution to the radiation sound reduction of the air intake system. References | Related Articles | Metrics

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Optimization Path of Military Shelter Vehicle Chassis SHENG Xianli 2022, 47(6): 61-65.  DOI: 10.16638/j.cnki.1671-7988.2022.006.013 Abstract ( )   PDF (990KB) ( )   To explore the optimization path of military shelter vehicle chassis, in order to make a modest contribution to improving the technical level of military shelter vehicle chassis in China. Based on the analysis and investigation of military shelter vehicle chassis integration technology in the early stage, combined with specific project cases, this paper focuses on the relevant contents and precautions of military shelter vehicle chassis optimization and modification, including beam column rear suspension optimization of military shelter vehicle chassis, processing and design of support auxiliary devices, vehicle chassis toolbox and vehicle chassis fuel tank modification optimization module. Through the optimized path of military shelter vehicle chassis, the power system, bearing capacity, toughness and stiffness of military shelter vehicle chassis were effectively improved.The refitting and optimization of military shelter vehicle chassis is caused by the trend of light military refitted vehicles moving into square cabins. Military shelter vehicle R & D personnel should firmly grasp the development opportunity. Military shelter vehicle chassis needs to be continuously optimized in the process of practice, so as to improve the overall quality and level of military shelter. References | Related Articles | Metrics

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Optimization of Thermal Cycle Based on Engine Waste Heat Recovery LI Fanbin 2022, 47(6): 66-69.  DOI: 10.16638/j.cnki.1671-7988.2022.006.014 Abstract ( )   PDF (937KB) ( )   Since only 25% ~ 35% of the heat generated by the combustion of the common automobile engine fuel is converted into effective output work, according to the characteristics of the waste heat of the engine, water is selected as the working medium to study how to avoid the phenomenon of wet liquid impacting the expander and realize the control of waste heat recovery system. Through the Rankine cycle principle, the evaporator superheat control is used to optimize the waste heat recovery system. In order to improve the waste heat recovery cycle efficiency, the solenoid valve control is added to control the speed of the working medium pump and the pressure of the evaporator, which can avoid the liquid collision of the expander. The overheating stability is effectively controlled and the cycle efficiency is improved. References | Related Articles | Metrics

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Based on ANSYS Design of Railway Car Bogie Special Lifting Spreader QI Jing 2022, 47(6): 70-74.  DOI: 10.16638/j.cnki.1671-7988.2022.006.015 Abstract ( )   PDF (5378KB) ( )   This paper seeks to develop and design a special automatic spreader equipment for railway car bogie, including the positioning and analysis device before hoisting, the locking mechanism and automatic release device during hoisting, and establishes a suitable new type of automatic spreader for the production, transfer and storage of railway car bogies. Based on ANSYS finite element analysis software, the static strength and stiffness of the model are analyzed to test the structural strength of the spreader system. Combined with the investigation, when the vertical and horizontal direction of the rated lifting capacity in the horizontal plane deviates from the center line of the spreader by 10% and 20% under the limit working condition, the kinematics and dynamics simulation of the special spreader structure are studied. Verify the motion characteristics of the spreader in the whole working process under different working conditions, which can provide reference for the design of large-scale similar products. Finally, it shows that under the action of 15t load, considering the dynamic load coefficient of 1.15 times, when the load center of gravity deviates from the center line of the spreader in the horizontal plane by less than 20%, the stiffness and strength of the spreader structure meet the use requirements. Its theoretical development size meets the planning requirements and provides calculation support for its structural lightweight. References | Related Articles | Metrics

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Design of Automobile Door Opening Anti Collision System Based on Millimeter Wave Radar FEI Wenyu 2022, 47(6): 75-81.  DOI: 10.16638/j.cnki.1671-7988.2022.006.016 Abstract ( )   PDF (5008KB) ( )   When the vehicle pulls over, the passengers in the vehicle can't accurately judge the road condition behind because of the blind area of vision and other factors. After blindly opening the door, they collide with the dangerous objects coming from behind, causing serious personal injury and property loss. In this paper, a car door opening and collision avoidance system based on millimeter wave radar is designed. After the door is opened, the object in the rear is detected in real time. The extreme learning machine model is used to judge the danger level, and the brake device of the limiter is used to limit the continuous opening of the door before the danger occurs, so as to avoid the occurrence of serious consequences. The innovation of this paper is to adopt the idea of process protection instead of locking the door, which has continuous protection function in the process of opening the door. The door can be opened at a small angle, which is convenient for people outside the car to understand the intention of passengers inside the car. References | Related Articles | Metrics

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Key Technology and Performance Analysis of High-step Cable Volume-released Device QIN Yuan 2022, 47(6): 82-85.  DOI: 10.16638/j.cnki.1671-7988.2022.006.017 Abstract ( )   PDF (988KB) ( )   In order to realize the large-span cable transmission for different operation platforms, aimed at high-step cable volume-released device, the key technology of the cable volume-released device, scissor type telescopic boom and control system are analyzed. The device can realize the volume-released cable under flat ground and high step conditions. The scissor type boom is made of strength aluminum alloy material, of which the arm is installed a hydraulic cylinder properly to assist in the expansion arm operation. Load analysis, overturning moment and counterweight analysis of the scissor type boom are researched. Finite element analysis of the scissor type boom indicates that its maximum stress is 149 MPa, less than the allowable stress of the material, complying with the design requirement. The boom extension of 50 meters is considered as the maximum overturning moment, and the counterweight of 10 t is used as the normal counterweight of the whole machine. It can provide reference for design of the similar high-step cable volume-released device. References | Related Articles | Metrics

Testing and Experiment

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Comparative Test and Evaluation Standard of Vehicle Air Conditioner Cooling Performance FANG Xiaonan 2022, 47(6): 86-89.  DOI: 10.16638/j.cnki.1671-7988.2022.006.018 Abstract ( )   PDF (3304KB) ( )   In order to improve the comfort and driving experience of vehicle air conditioner, based on the industry standard QC/T 658—2000 Test Method for Cooling Performance of Vehicle Air Conditioner, this paper designs a comparative test on the cooling performance and noise of two SUV models, and archives a comparative analysis on the test results. The cooling rate and driver's ear noise can be used as two evaluation indexes of air conditioning comfort, which provide engineering reference for the cooling and noise evaluation of vehicle air conditioning. References | Related Articles | Metrics

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Research and Application of Dynamic Performance of the Off-road Vehicle with Hydraulic Automatic Transmission LIU Gang 2022, 47(6): 90-93.  DOI: 10.16638/j.cnki.1671-7988.2022.006.019 Abstract ( )   PDF (1737KB) ( )   Maneuverability is one of the important performance indicators of the off-road vehicle, with the development of automatic transmisson technology, Chinese independent off-road vehicles match automatic transmisson, obvious technical advantages, the dynamic performance is effectively improved. Through simulation analysis, dynamic calculation, and vehicle test, ensure the excellent performance of the vehicle. The research and analysis results lay the foundation for a large number of matching applications of automatic transmisson in the off-road vehicle. References | Related Articles | Metrics

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Subjective Evaluation of Vehicle Dynamic Performance Based on Extension Matter Element Method LI Gailing 2022, 47(6): 94-99.  DOI: 10.16638/j.cnki.1671-7988.2022.006.020 Abstract ( )   PDF (1305KB) ( )   As an important attribute of vehicles’ active safety, the dynamic performance is needed to be effectively evaluated in many occasions such as automobile design and use. The subjective assessment method has the advantages of less restrictions, high efficiency and wide measurable parameters, which can better improve the compatibility between vehicle performance and actual consumer demand. In order to effectively synthesize many contradictory parameters in subjective evaluation and obtain evaluation results with certain discrimination, a subjective assessment method based on the maximum deviation weighting method and extension matter-element method is proposed in this paper. First, feature with greater difference is assigned to larger weight by the maximum deviation weighting method. Second, contradictions and inconsistencies between evaluation indicators are converted into compatibility problems by the modified extension matter-element method. The subjective feelings of evaluators are transformed into quantitative values with scientific basis, which can provide decision support for managers and decision makers. References | Related Articles | Metrics

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Comparative Study of Power Module Heatsinks on Electric Vehicle with Various Configurations Based on Fluent MA Yaqing 2022, 47(6): 100-104.  DOI: 10.16638/j.cnki.1671-7988.2022.006.021 Abstract ( )   PDF (3964KB) ( )   Comparative study on the thermal simulation of heatsinks on electric vehicle with various configurations for Insulated-Gate Bipolar Transistor has been undertaken in this paper. For the purpose of validation of numerical module, a simulation was conducted in the first place for diamond pinfin heatsink. The reliability of the chosen fluid model, mesh density and material properties have been demonstrated through the close agreement between the numeral results and experimental data. With the verified model, a circular pinfin heatsink has been established to ensure the identical pressure drop with diamond one in order to identify the dimension of the circular pin. By introducing the power module with certain power loss, the thermal simulations on these two heatsinks have been carried out. Through the comparison of the numerical results, it has been shown that the junction temperatures of the power modules from circular configuration are about 1.5% higher than the ones from diamond one and the highest surface temperatures of the heatsinks are in good consistence. Nevertheless, these results comply with the product specifications.With the consideration of 27% weight loss compared to the diamond pinfin structure, circular pinfin configuration is assumed as a better choice for power module heatsink. In this study, the verified numerical model contributed to analyse the heat dissipation and temperature distribution of the power module and helped to select the optimum configuration of pinfin structure. Hence, the experiment cost and time for the product development can be substantially reduced. References | Related Articles | Metrics

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Collision Performance Simulation of Honeycomb Sandwich Thin-wall Beam JIN Wanzeng 2022, 47(6): 105-109.  DOI: 10.16638/j.cnki.1671-7988.2022.006.022 Abstract ( )   PDF (2037KB) ( )   A damage analysis model of honeycomb-filled thin-walled column was established. The Besant criterion combined with constant stiffness reduction method was adopted to predict the material parameters of honeycomb core under damage. The delamination phenomenon between honeycomb core and column was simulated by surface-based cohesive behavior. Based on ABAQUS software, the influence of thickness of thin-wall column, section width and collision angle on crash worthiness was analyzed. Simulation results show that honeycomb-filled thin-walled column can effectively enhance the collision performance. It is instructive for the design and parameter selection of thin-walled column. References | Related Articles | Metrics

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Evaluation of Uncertainty in Pressure Test of Vehicle Airbag Gas Generator YANG Jinxue 2022, 47(6): 110-113.  DOI: 10.16638/j.cnki.1671-7988.2022.006.023 Abstract ( )   PDF (1345KB) ( )   The gas generator is the gas generating device of the automobile airbag and is its core component. The deployment time and inflation pressure of the airbag are directly related to the gas generator, and are the key technical indicators for evaluating the quality of the gas generator.In order to ensure the accuracy and consistency of the test data during the test of the pressure vessel of the automobile airbag gas generator, on the premise of assuming that there is no difference between the test samples, the general method is used to analyze and confirm the main factors affecting the whole test process. At the same time, the uncertainty of pressure test data corresponding to P50%、 P75%、P90% and Pmax time points in the test results is evaluated. The credibility of the test data is confirmed, the reliability of the test method of the pressure vessel of the gas generator is ensured, and the product performance and safety requirements are met. References | Related Articles | Metrics

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Steering Force Test Method Based on CAN Message MA Ju 2022, 47(6): 114-119.  DOI: 10.16638/j.cnki.1671-7988.2022.006.024 Abstract ( )   PDF (1573KB) ( )   In the steering system performance test, the torque steering wheel is usually used to test the steering torque, but the test preparation time of this scheme is long, and the installation and disassembly of the equipment are complex, so there is a simple method to measure the steering force by using the message sent by the electric power steering column node on controller area network bus is proposed. In this paper, the steering wheel angle and steering force are measured based on the angle sensor and torque sensor of the electric power steering column, the data is collected through the controller area network message on the controller area network-bus to get the relationship between the steering wheel angle and steering force, and the data show that the steering torque is small and meets the requirements of steering performance. By comparing the results of the steering force measuring instrument and the controller area network message test shows that the measurement error of the two measurement values is small and the trend is the same, which indicates that the method of testing the steering force through controller area network message is feasible,reliable and accurate. The test method through controller area network message can reduce the test cost and shorten the vehicle development cycle. References | Related Articles | Metrics

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A Characteristics Analysis and Simulation Study on the Shifting Gradient of Continuously Variable Transmission LIU Yaofeng 2022, 47(6): 120-127.  DOI: 10.16638/j.cnki.1671-7988.2022.006.025 Abstract ( )   PDF (1776KB) ( )   In order to study the influence of the change rate of the steel belt speed ratio of the continuously variable transmission on the driving economy of the whole vehicle, the paper analyzes the mechanical and hydraulic characteristics of the steel belt system, and builds a simulation model of the continuously variable transmission. Through theoretical analysis and derivation, the mathematical relationship between vehicle acceleration, fuel consumption rate and speed ratio change rate under transient conditions is obtained. With the help of the simulation environment, the influence of the change rate of the speed ratio on the hardware safety and the power, economy and ride comfort of the vehicle under a typical working condition is analyzed. From this, it is known that the vehicle application can control the change rate of the speed ratio according to the driving intention, and at the same time, the change rate of the speed ratio needs to be limited. This provides a theoretical basis for the research and development of speed ratio control based on driving intention and the desktop calibration of speed ratio parameters. References | Related Articles | Metrics

Process and Equipment

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Design and Application of an Air Suspension Workstation Appliance HAN Tao 2022, 47(6): 128-131.  DOI: 10.16638/j.cnki.1671-7988.2022.006.026 Abstract ( )   PDF (6315KB) ( )   The current air suspension assembly operation mode is difficult to meet the online production schedule, and the process is complex and inefficient. During storage, the air suspension airbag is not rigid and is easily deformed and broken by extrusion, resulting in reworking and replacement of the air suspension airbag. In response to the above problems, the paper adopts the modular concept of air suspension assembly and designs an integrated workstation apparatus to meet the air suspension sub-assembly-storage-transfer requirements, and this workstation apparatus can be adjusted up and down to meet different air suspension assembly applications, so that it can achieve the goal of integration, improve assembly efficiency and reduce assembly labour intensity. The results show that the design is effective in avoiding the risks associated with the assembly process of commercial vehicle air suspension models. References | Related Articles | Metrics

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The Prevention and Treatment Technology of Paint Film Defect in Automobile Spray Paint YANG Kai 2022, 47(6): 132-136.  DOI: 10.16638/j.cnki.1671-7988.2022.006.027 Abstract ( )   PDF (4073KB) ( )   The continuous development of automobile spray painting technology has further improved the maintenance effect of automobile paint surface and ensured the aesthetics of automobile. But in the process of automobile spray painting is often faced with many influencing factors, leading to the application of technology there are certain defects, which need to be based on the control requirements of automobile spray painting technology, timely adjustment and improvement of automobile spray painting technology, to meet the technical implementation requirements of the development of automobile spray painting technology. In this regard, this paper will focus on the automotive spray painting treatment, analysis of automotive spray painting and related processes, in view of the defects of the film and the reasons for the discussion, put forward the related film defects prevention and treatment technology. References | Related Articles | Metrics

Automobile Education

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The Application of Virtual Reality Technology to Higher Vocational Practical Education —Taking Automobile Painting Course as an Example CAO Wenjun 2022, 47(6): 137-140.  DOI: 10.16638/j.cnki.1671-7988.2022.006.028 Abstract ( )   PDF (4440KB) ( )   Automobile painting is a professional core course of automobile body maintenance specialty. There are some problems in the practical course, such as few practical hours, too one-sided practical content, lack of targeted training, large waste of consumables and so on. This paper integrates a variety of information-based teaching means, and runs through the whole teaching process with network teaching platform and app mobile teaching software, including the release of pre class learning materials, task books and pre class test questions, attendance, self-test and real-time feedback of problems in class, and knowledge expansion and homework release after class. The virtual reality technology is integrated into the course design, course assessment, evaluation design and course implementation of automobile coating course, and the virtual reality practice course is preliminarily explored. After using virtual reality technology to improve the traditional automobile coating practice course, the teaching effect has been significantly improved, the virtual and real projects are closely connected, the teaching cost is saved, the difficulties are solved at fixed points, and the direction of students' improvement is clarified. References | Related Articles | Metrics

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Research and Practice of Mobile Teaching Platform Plus Flipped Classroom Teaching Mode HUANG Chunmei 2022, 47(6): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2022.006.029 Abstract ( )   PDF (1095KB) ( )   In order to better improve students of the automobile repair major and transportation major in the teaching of specialized course teaching effect, according to the students' learning of higher vocational enrollment expansion analysis, combining the characteristics of learning, change the traditional teaching mode, improve the students' learning initiative, the use of mobile learning platform plus flip classroom teaching mode, to take the student as the center, the teacher to guide the reform of teaching. The three learning links before class, during class and after class are organically combined with the mobile teaching platform. In the practice of automobile repair major and transportation major, it is proved that the integration of mobile teaching platform with multimedia and other information means can enrich the teaching content of classroom, it can improve the teaching effect more prominent, promote the common growth of teachers and students, and be more conductive to the development of students' comprehensive quality. References | Related Articles | Metrics

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The Windows and Door Locks Caused by the Virtual Connection of the Magotan B8 J387 Power Line LI Dan 2022, 47(6): 145-151.  DOI: 10.16638/j.cnki.1671-7988.2022.006.030 Abstract ( )   PDF (5078KB) ( )   This paper mainly combined with the item of Body Electric Fault malfunction in the automobile detection and maintenance competition of vocational college skill contest, taking the malfunction of the vehicle window system of Magotan B8L2.0T as an example, the composition, structure and control principle of the window glass elevator system for Volkswa- gen Magotan B8L2.0T vehicle are analyzed in detail, and the design thought of the test questions and the process of diagnosis and elimination are analyzed and introduced step by step, this paper provides a teaching case for the professional teachers and competition coaches of automobile inspection and maintenance in vocational colleges. It also provides ideas for the students and the staff to diagnose and remove the same type of faults, training technical talents of automobile maintenance specialty. References | Related Articles | Metrics

Standards Regulations Management

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Exploration of Operation Management Level Improvement Based on ERP Upgrade and Transformation REN Xiaohong 2022, 47(6): 152-156.  DOI: 10.16638/j.cnki.1671-7988.2022.006.031 Abstract ( )   PDF (1554KB) ( )   This article is based on the implementation of enterprise resource planning project’s upgrade and launch to improve the operational effect for a manufacturing company, which is an innovative application of methods, such as organizational structure, project management, business index identification and quantitative measurement, closed-loop management improvement, etc. Realize the bill of material full coverage and chain management, improve the automation and refinement of financial accounting, unify the material main data standardization, implement end-to-end process in the information system and detected the operation effect, link the production plans and procurement plans, improve the accuracy of delivery estimates, unify the business rules between the headquarters and subsidiaries, implement group management models, etc. Through the construction of the information system, the performance evaluation index system is designed for continuous statistics, analysis and improvement. A feedback response mechanism for problems and new needs is established to promote the dual optimization of system functions and business processes. This is a typical path for the manufacturing industry to implement informatization and improve the effect of business operations. Through standardized process documentation and training capacity building and transfer, it will ensure that the actual realization of the expected goals after the project launched, and even iterative improvement. References | Related Articles | Metrics

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Route Analysis of Emergency Resource Dispatch for Urban Road Traffic Emergencies YAN Junxia 2022, 47(6): 157-161.  DOI: 10.16638/j.cnki.1671-7988.2022.006.032 Abstract ( )   PDF (3001KB) ( )   Emergency rescue dispatch should be efficient, timely and convenient to start emergency rescue dispatch when an accident occurs, so as to achieve as little loss as possible, but in the specific implementation, rescue equipment, rescue teams, rescue routes and other information can not be quickly determined, resulting in significant loss of life and safety of people and property. The article takes municipal road emergency resource scheduling as the background, conducts AHP (Analytic Hierarchy Process) hierarchical analysis on each impedance factor, and uses the shortest path Dijkstra algorithm for modelling to solve the optimal path for emergency resource scheduling of municipal traffic road networks. ArcGIS software is used to create a network analysis network model,and the Dijkstra shortest path algorithm is used to model the optimal path selection for emergency resource dispatching, making it more relevant to improve emergency rescue capabilities, and combined with practical examples to verify the feasibility of the GIS-based optimal path analysis solution for road emergency resource dispatching, providing the optimal path selection for urban road traffic emergency resource dispatching decision support. References | Related Articles | Metrics

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Progress in Demonstration Application of Autonomous Driving Passenger Testing WANG Chunyang 2022, 47(6): 162-166.  DOI: 10.16638/j.cnki.1671-7988.2022.006.033 Abstract ( )   PDF (1048KB) ( )   With the continuous development and fusion of information communication, digital technology and artificial intelligence technology, auto companies and upstream and downstream industry chain encounter a new turning point and opportunity, usher in intelligent transform, and that gradually influence people travel methods. Technology internet companies at home and abroad invested in research and development of autonomous driving, layout in the field of intelligent travel. Six cities including Guangzhou, Changsha, Shanghai, Wuhan, Cangzhou and Beijing opened autonomous driving passenger test in succession, in order to promote the application of autonomous driving. It studies the progress of autonomous driving demonstration applications in major companies from three aspects: travel companies, technology internet companies, and start-up companies in this paper. And it analyzes the difficulties of commercial application of autonomous driving mainly due to lack of legal and regulatory support, high cost, technical difficulty and weak infrastructure, etc. References | Related Articles | Metrics

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Review on Driving Behavior Prediction Model in Unmanned Driving ZHAO Chenhao 2022, 47(6): 167-170.  DOI: 10.16638/j.cnki.1671-7988.2022.006.034 Abstract ( )   PDF (1131KB) ( )   Predicting the driving behavior of surrounding vehicles is of great significance to improving the safety of driverless cars. This paper divides the driving behavior prediction model in driverless cars into three aspects: description of driving behavior, driving behavior prediction algorithm, and formulation of driving strategy. It sorts out the typical driving behavior prediction models in current driverless vehicles. This article first introduces three driving behavior description methods, subjective definition, finite state machine, and trajectory characteristics, and summarizes the characteristics of various driving behavior prediction models. It points out the limitations of the three typical driving behavior description methods in the actual driving environment. In complex scenes, Hidden Markov model is difficult to classify hidden states and the determination of parameters is too complicated. Finally, the possible application of computer vision in driving behavior prediction models in the future is prospected. This paper summarizes the typical methods of current driving behavior prediction, which provides a reference for data-driven driving behavior prediction research combined with computer vision, and helps researchers to further familiarize themselves with related fields. References | Related Articles | Metrics

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Influencing Factors of Purchase Intention of New Energy Vehicles in Zhengzhou DONG Ting 2022, 47(6): 171-175.  DOI: 10.16638/j.cnki.1671-7988.2022.006.035 Abstract ( )   PDF (1263KB) ( )   For the purchase intention of new energy vehicles, issuing questionnaires online and collecting data, firstly, the correlation between the respondents' seven basic information and the purchase intention of new energy vehicles is analyzed, and then makes factor analysis on thirteen factors affecting consumers' purchase intention of new energy vehicles in this paper. The results show that, on the one hand, there is a significant relationship between the purchasing intention of new energy vehicles and the respondents' gender, education background, occupation, driving license and marital status. On the other hand, the factors for consumers to evaluate whether to buy new energy vehicles are environmental protection, convenience and policy support, performance, infrastructure and sales price. According to the above analysis results, reasonable suggestions can be given to promote the development of new energy vehicles in Zhengzhou. References | Related Articles | Metrics

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Research Status and Prospect of Dual Clutch Transmission YUAN Shao 2022, 47(6): 176-180.  DOI: 10.16638/j.cnki.1671-7988.2022.006.036 Abstract ( )   PDF (1260KB) ( )   Dual clutch transmission (DCT) combines the advantages of manual transmission and automatic transmission. It has become the research focus of current transmission industry. This paper introduces the working principle and classification of DCT. The performances of wet DCT and dry DCT are contrastively analyzed. The research status of DCT at home and abroad is described. The development trend of DCT is prospected. The key technologies of DCT development are analyzed from the perspectives of the development of dual clutch module, the thermal management system, the starting control strategy and the intelligent shift schedule. The common problems of DCT are summarized. It has certain reference significance to the research and study of dual clutch transmission. References | Related Articles | Metrics

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Review of Rollover Warning Algorithm of Semi-trailer LI Mingtao 2022, 47(6): 181-186.  DOI: 10.16638/j.cnki.1671-7988.2022.006.037 Abstract ( )   PDF (1346KB) ( )   In recent years, the paving and development of expressways has driven the vigorous development of the road transportation industry with heavy-duty semi-trailers as carriers. At the same time, the driving safety of semi-trailers has become increasingly prominent. In order to make semi-trailer vehicles safer during road transportation, the research on semi-trailer vehicle rollover warning will occupy an important position in the field of intelligent transportation safety in the future. This paper Summarizes the current research status of domestic and foreign semi-trailer vehicle rollover early warning, classifies existing semi-trailer vehicle early warning algorithms, introduces and compares current typical semi-trailer vehicle early warning algorithms, and discusses the main features of semi-trailer vehicle early warning algorithms with facing problems and future research directions. References | Related Articles | Metrics