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15 April 2022, Volume 47 Issue 7 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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Research on the Functions of an Electric Vehicle Hill Descent Control System FANG Tao 2022, 47(7): 1-7.  DOI: 10.16638/j.cnki.1671-7988.2022.007.001 Abstract ( )   PDF (952KB) ( )   An implementation method of a hill descent control system for electric vehicles was described in this paper. In order to analyze the braking and energy recovery performance of the system, a simulation model of the system was established and the simulation analysis was carried out. The results show that when the electric vehicle implements hill descent control function, the vehicle speed can be gradually reduced to the target value and the braking function can be realized. At the same time, in the process of braking the vehicle, it can also realize the function of energy recovery. It shows that the system improves the safety, comfort and driving range of the electric vehicle. References | Related Articles | Metrics

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The Influence of Brake Modes of Chassis Dynamometer on Electric Vehicle Energy Consumption MA Yanfei 2022, 47(7): 8-11.  DOI: 10.16638/j.cnki.1671-7988.2022.007.002 Abstract ( )   PDF (2258KB) ( )   In order to study the chassis dynamometer economy test three modes (robot active braking, robot auxiliary site dynamometer braking and artificial driving braking) on the influence of the energy consumption of electric vehicle economy test, the article mainly through the same car under the same condition of three braking modes for energy consumption test, and analyze the energy consumption of each working condition, finally get the robot driving for electric vehicle energy consumption and has high consistency, have certain reference for later research. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Parallel Parking Simulation Analysis Based on CarSim ZHANG Peng 2022, 47(7): 12-15.  DOI: 10.16638/j.cnki.1671-7988.2022.007.003 Abstract ( )   PDF (838KB) ( )   Automatic parking system is an important field of intelligent driving technology and plays an important role in the last kilometer of intelligent driving. In the research of automatic parking system, a multinomial fitting multi-section parking path planning method is proposed to solve the problem of discontinuous curvature of traditional circular arc linear tangent parking path. In the vehicle motion control part, the model predictive control method is used to control the lateral motion of the vehicle. Since there is no accurate model of vehicle longitudinal motion, proportional-integraldifferential feedback is used to control vehicle longitudinal velocity. Finally, the CarSim vehicle dynamics simulation software and Matlan/Simulink are used for simulation analysis. The experimental results show that the parking path designed in this paper is suitable for parking conditions, and the tracking error is small. References | Related Articles | Metrics

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Faster R-CNN 在车辆视频目标检测的应用 HA Minjie 2022, 47(7): 16-18.  DOI: 10.16638/j.cnki.1671-7988.2022.007.004 Abstract ( )   PDF (527KB) ( )   In recent years, solving traffic congestion has become the first task of traffic problems, and the application of vehicle detection and identification in many aspects has become one of the more commonly used solutions. Faster R-CNN based on convolutional neural network has gradually become an important method for image object detection and recognition. The algorithm has high detection accuracy and small limitations, so it has received widespread attention. At present, the commonly used algorithm models are based on the correction of the parameters of the model itself, and rarely involve improvements other than the network structure. In this paper, the network structure improvement, anchor frame extraction improvement and candidate frame parameter correction method based on faster R-CNN vehicle object detection method are discussed, especially the retraining after preprocessing of data sets is often more effective. These methods can not only make the network structure lightweight, but also increase the generalization ability of the network, so that Faster R-CNN can complete more complex traffic environment detection tasks, and the recognition accuracy has also been significantly improved. References | Related Articles | Metrics

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Model Construction and Application of a Rule Based Autopilot Platform LI Jiale 2022, 47(7): 19-24.  DOI: 10.16638/j.cnki.1671-7988.2022.007.005 Abstract ( )   PDF (4221KB) ( )   In order to meet the need of the test platform for the automobile industry and the professional education of vehicle engineering, this paper explored the relevant experimental research and mathematical modeling of vehicle automatic driving, using 3D model to link and share data with the external equipment so as to realize the human-computer interaction between the virtual model and the real driving simulator. Regular automatic driving platform is a test platform to realize the movement of vehicles in virtual reality environment on the basis of ensuring the hardware function. At the initial stage of this project, the Unity3d engine is used for modeling, Easyroads and other materials are used for modeling roads, buildings and road facilities. On this basis, the Thrumaster T150 force feedback steering wheel is used to realize human-computer interaction. Experiments show that the model can meet the needs of vehicle teaching experiment. References | Related Articles | Metrics

Design and Research

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The Layout and Sealing Technology of a Kitchen Garbage Vehicle XUE Yagang 2022, 47(7): 25-28.  DOI: 10.16638/j.cnki.1671-7988.2022.007.006 Abstract ( )   PDF (704KB) ( )   The kitchen garbage truck is a special vehicle for collecting and transporting kitchen garbage. In the process of collection and transportation, users and the government must realize the whole process of supervision and settlement. This article introduces a pure electric kitchen garbage truck based on the vehicle layout and sealing technology. It mainly ensures the sealing of the rear door from its floating hinge mechanism and adjustable wedge tightening mechanism. The vehicle layout is reasonable, the loading capacity is large, and the belt weighing heavy system, sealed without leakage, provides a strong reference value for the development of kitchen garbage trucks. References | Related Articles | Metrics

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Drivers' Hazard Perception Based on Eye Movement LI Xianghong 2022, 47(7): 29-34.  DOI: 10.16638/j.cnki.1671-7988.2022.007.007 Abstract ( )   PDF (1052KB) ( )   In order to study the hazard perception ability of different drivers, the driver hazard perception test software developed by win10 system and eye tracker were used to play 22 dynamic traffic scene videos which contain potential dangers. The time to first glance, mean glance duration, mean saccade duration, number of glances, number of saccades, horizontal eye movement amplitude and area of interesting (AOI) attention ratio were selected as indexes to test the risk perception ability of novice and experienced drivers. The results showed that there were significant differences between the experienced group and the novice group in the time to first glance, mean glance duration, horizontal eye movement amplitude and AOI attention ratio, but no significant differences in mean saccade duration, number of glances and number of saccades. In addition, compared to novice drivers, experienced drivers presented shorter danger detection duration, longer glance duration to AOI, higher AOI attention ratio, and larger horizontal eye movement amplitude. References | Related Articles | Metrics

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Objective Evaluation Method of Driveability of 48 V Light Hybrid Passenger Car GUO Wencui 2022, 47(7): 35-41.  DOI: 10.16638/j.cnki.1671-7988.2022.007.008 Abstract ( )   PDF (1041KB) ( )   The 48 V light-hybrid passenger car can achieve an energy-saving effect of more than 10% under New European Driving Cycle conditions, which also improves the dynamics of the vehicle. In order to study the impact of the 48 V system on the driving performance based on the energy-saving effect, a comparative analysis was carried out on the fuel-based vehicle and the same platform vehicle with the 48 V system on the basis of the comparison and analysis, using subjective and objective. The correlation method has developed subjective and objective correlation evaluation indicators that reflect driving performance under four working conditions, such as response time, acceleration ability, jitter, and impact. By collecting and calculating vehicle Controller Area Network signal and acceleration sensor signal data, the two models are studied at the start.Driving performance including dynamic response, driving smoothness and ride comfort under four working conditions: rapid acceleration, braking deceleration and acceleration from 100 kilometers. The research results show that the 48V system has a significant effect on improving the vehicle's dynamic response, especially in the initial start and rapid acceleration conditions, the fastest time can be shortened by nearly 35%; the 48 V system also has a certain degree of improvement in ride comfort and comfort, but The degree of improvement is also affected by the overall matching level of the power transmission system. References | Related Articles | Metrics

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Automobile Exterior Product Design CHEN Ya 2022, 47(7): 42-47.  DOI: 10.16638/j.cnki.1671-7988.2022.007.009 Abstract ( )   PDF (1439KB) ( )   In order to summarize the design experience of automobile exterior products and improve the design ability of automobile exterior products, this paper analyzes and discusses the schematic design, structural design, precision design and design verification of automobile exterior products. Combined with the specific product design cases such as tail spoiler and bumper, the design methods and key points at each stage of automobile exterior product design are obtained. It is hoped that this paper can provide effective reference for the design of automobile exterior decoration products. References | Related Articles | Metrics

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Optimization Design and Analysis of Compressor Support of a Light Truck Refrigerator Truck with Air Brake LI Jiangbing 2022, 47(7): 48-52.  DOI: 10.16638/j.cnki.1671-7988.2022.007.010 Abstract ( )   PDF (2372KB) ( )   In view of the frequent failure of refrigerated vehicles in the market, which leads to the deterioration of frozen goods and huge economic losses, through the failure analysis of refrigerated vehicles, it is understood that the fracture of refrigeration compressor support is one of the main failure reasons. Using the combination of Computer Aided Engineering (CAE) and road test verification means, this paper analyzes the fault analysis and optimal design of the refrigeration compressor support of the refrigerator truck, analyzes the structural strength, first-order natural frequency and fatigue stress of the support, and expounds the design and development points and verification methods of the refrigeration compressor support. The refrigerator truck compressor bracket designed according to the development method in this paper has no fracture failure mode after sales, and has achieved great success. This method has passed the examination of the market. The development method of refrigerator truck compressor support proposed in this paper can provide reference for designers, avoid abnormal operation of refrigeration unit due to support fracture, and improve the overall development capacity and quality level of China's refrigerator truck. References | Related Articles | Metrics

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The Drive System Parameter Matching of Range Extended Electric Vehicle ZHANG Jinying 2022, 47(7): 53-57.  DOI: 10.16638/j.cnki.1671-7988.2022.007.011 Abstract ( )   PDF (1255KB) ( )   Range extended electric vehicle can effectively play the advantages of pure electric vehicles, it solves the problem of short range. The range extended electric vehicle is the research object, the power transmission scheme of the range extended electric vehicle is designed. This design calculates the motor, internal combustion engine, battery and other main power unit parameters, the design of energy recovery and control strategy are studied, new european driving cycle and FTP-75 operating conditions are simulated, the simulation results show that the design of electric vehicles, It gives full play to the characteristics of electric vehicles, such as zero emissions, less petrochemical energy, The design parameters meet the road driving conditions, the design energy efficiency is excellent and meets the requirements of electric vehicles driving range. References | Related Articles | Metrics

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Body Structure Design of Reformed M2 Vehicle Based on LS-DYNA LIU Shanying1 2022, 47(7): 58-63.  DOI: 10.16638/j.cnki.1671-7988.2022.007.012 Abstract ( )   PDF (1991KB) ( )   Based on the N1 type multi-purpose vehicle model, this paper uses LS-Dyna software to carry out an extended optimization simulation analysis of the body structure to evaluate the strength of the optimized front and rear rollover structures; and according to the optimization results, real vehicle trial production and tests are carried out to verify the reliability of the optimization scheme; the results show that, before the optimization, the lower part of the B-pillar was plastically bent, and the front windshield beam was seriously deformed. After the optimization, the body deformation was significantly reduced, and the distance between the upper body and the production space reached 92 mm, with a high safety margin; according to the optimization results, the actual vehicle was restructured and strengthened, and carry out tests according to regulations. The results show that the minimum distance from the car body to the living space is 115mm, which meets the requirements of simulation analysis and meets the strength of regulations. GB—17578 Strength Requirements and Test Methods of Passenger Car Superstructure regulations, economical and reliable. References | Related Articles | Metrics

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Analysis and Optimization on Front Bumper Crash Structural Performance of a Blade Electric Vehicle TANG Guangcai 2022, 47(7): 64-67.  DOI: 10.16638/j.cnki.1671-7988.2022.007.013 Abstract ( )   PDF (1390KB) ( )   To improve the energy absorption effect of the front bumper of electric vehicle, a blade electric vehicle is selected as the research object in this paper, and establish the collision model between the vehicle and the front rigid wall by using HyperMesh. Then the dynamic analysis software LS-DYNA is used to calculate the model. Finally, the stress-strain cloud diagram of the vehicle and the corresponding parts of the energy absorbing box is obtained based on HyperViews. Three kinds of structure schemes about energy absorbing box were compared and the optimal scheme was obtained, which provided a certain reference value for future vehicle collision analysis. References | Related Articles | Metrics

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Design of the Acquisition Program of Car Body Control Analog Signal Based on CAN Bus GUO Xiaolong 2022, 47(7): 68-70.  DOI: 10.16638/j.cnki.1671-7988.2022.007.014 Abstract ( )   PDF (1272KB) ( )   In order to study the driving torque control strategy of electric vehicles, one of the first problems to be solved is the acquisition of vehicle body control analog signals，analog signals such as accelerator pedal directly reflect the driver's driving intention. In this paper, based on the controller area network bus, a vehicle body control analog signal acquisition program is designed. The vehicle controller with XC2267M as the main control chip collects the vehicle body control analog signal, it is sent to the upper computer software through controller area network bus for real-time monitoring and processing, which has certain engineering practical value. References | Related Articles | Metrics

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Multi Function Design and Stress Analysis of Automobile Seats XIANG Weineng 2022, 47(7): 71-74.  DOI: 10.16638/j.cnki.1671-7988.2022.007.015 Abstract ( )   PDF (1564KB) ( )   In order to comprehensively improve the ride comfort, this article establishes a parametric model through the 3D software UG / NX, and develops, designs and analyzes the car seat function on the established car seat model.The results of ANSYS Workbench finite element analysis show that the storage box designed under the cushion is almost not deformed under different weights.Through the optimization design of car seats, the intelligent design of car seats is realized, which has certain reference significance for the research in the industry. References | Related Articles | Metrics

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The Test Device of the Automobile Freedom Vibration Test-bed WANG Liping 2022, 47(7): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2022.007.016 Abstract ( )   PDF (1150KB) ( )   In the process of vehicle driving, due to ground roughness, engine and gearbox gear vibration and other factors, auto parts suffer impact load for a long time, resulting in damage, shortened life or impact on the accuracy of instruments, etc., which will cause great harm to the vehicle. The test device of the automobile freedom vibration test-bed can realize the acquisition of vibration signal and reduce the harm caused by vibration to the automobile.Based on LabVIEW software development platform, a signal test device suitable for vibration test bench is designed. Through the analysis and demonstration, the design parameters and design requirements of the test device are clear, the hardware is selected, according to the hardware connection, the hardware connection circuit diagram is also drawn, in the aspect of software, the programming software is selected, the software is designed, and the software is self tested. Acceleration, angular velocity and angle are selected as the test objects. Through the simulation test, the designed signal test device can realize the signal acquisition, processing and display operation, and meet the design requirements. References | Related Articles | Metrics

Testing and Experiment

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The Application of CFD Simulation Software in Heavy Truck Cooling Module Selection YIN Yuxian 2022, 47(7): 80-83.  DOI: 10.16638/j.cnki.1671-7988.2022.007.017 Abstract ( )   PDF (1141KB) ( )   In order to effectively optimize the heavy truck engine cooling module, this paper takes the engine cooling module of a domestic heavy truck dump in China as the research object, uses the computational fluid dynamics analysis software CFD STAR CCM+, uses the K-Omega turbulence model and the MRF multiple reference frame model to analyze the flow field of the cooling module, cooling fan and engine compartment of the whole machine. The simulation analysis was carried out, and the average wind speed passing through the surface of the radiator, intercooler and condenser in the cooling module was obtained under the two working conditions of power point and torque point, respectively. The CFD simulation results show that a one-dimensional simulation model is established in Kuli software to obtain the radiator liquid temperature difference and the intercooling temperature rise under the power point and torque point conditions, and then the radiator liquid temperature difference and the intercooling temperature rise are compared with the target. Values are compared to draw conclusions about whether the selected cooling module can meet the cooling requirements of the engine. The application of CFD software can highly improve the efficiency and accuracy of cooling module choice comparing with the traditional choice method, and set solid foundation the cooling system forward design. References | Related Articles | Metrics

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Detection and Analysis of Vehicle Objects in Tunnel Environment TIAN Yankang 2022, 47(7): 84-88.  DOI: 10.16638/j.cnki.1671-7988.2022.007.018 Abstract ( )   PDF (1379KB) ( )   In order to achieve real-time detection of vehicle object in tunnel environment, an improved YOLOv4 object detection algorithm was proposed. First, the Mobilenetv3 network was used to replace the backbone network of the YOLOv4 algorithm which can reduce the amount of algorithm parameters and improve the detection speed; using a hybrid attention mechanism in the Mobilenetv3 network by combining channel and space dimensions to further improve detection accuracy of the algorithm; a lightweight PANet was proposed which used Ghost convolution operation to replace the ordinary convolution operation so to further reduce the amount of algorithm parameters. In order to verify the effectiveness of the designed model, the urban tunnel vehicle dataset is manually labeled. Experiments show that the object detection model designed in this paper has an average accuracy rate of 92.08% on the tunnel vehicle dataset which is similar to the original YOLOv4 network model. The detection accuracy are similar, but the speed is increased by 45.7%. References | Related Articles | Metrics

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Efficiency Improvement of Integrated Electric Drive System Based on Space Vector Pulse Width Modulation Optimization Algorithm HUANG Xiucheng 2022, 47(7): 89-95.  DOI: 10.16638/j.cnki.1671-7988.2022.007.019 Abstract ( )   PDF (1825KB) ( )   In order to improve the driving range of battery electric vehicle(BEV), the efficiency improvement method of the integrated electric drive system is comprehensively analyzed. Considering that the motor controller field is less studied at present, this paper establishes a power loss model of insulated gate bipolar transistor(IGBT) and proposes an improved algorithm of variable switching frequency based on space vector pulse width modulation(PWM). The simulation results show that the power loss of the improved algorithm based on variable switching frequency can be reduced by 49.46%～50% compared to the original one which is based on fixed frequency. The bench test and the vehicle test also show that the comprehensive driving efficiency of China Light-Duty Vehicle Test cycle(CLTC) is improved by 1.04%, and the driving range is increased by 25.86 km. It provides a theoretical and practical reference for the efficiency improvement of integrated electric drive system and the range improvement of BEV. References | Related Articles | Metrics

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Analysis on Steering Wheel Jitter of a Light Truck MA Bo 2022, 47(7): 96-99.  DOI: 10.16638/j.cnki.1671-7988.2022.007.020 Abstract ( )   PDF (1546KB) ( )   A light truck traveling to 100 km/h has abnormal steering wheel jitter, which disappears in other speed regions. In order to solve this problem, the steering wheel vibration acceleration peak and frequency is in line measured through a simple vibration test method, finally confirmed that the wheel assembly is abnormal caused by shaking. Through replacement of qualified wheel assemblies, jitter problems are eliminated and subjective evaluation are recognized. The conclusion of this study provides an effective correction method for analysis of steering wheel jitter. References | Related Articles | Metrics

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Structure Strength Analysis and Optimal Design for the Powertrain Mount Bracket GAO Juan 2022, 47(7): 100-106.  DOI: 10.16638/j.cnki.1671-7988.2022.007.021 Abstract ( )   PDF (2972KB) ( )   In order to deal with the problem of mounting bracket fracture of a heavy truck during vehicle road test, this paper combined FEM with bench and vehicle tests. The results of structure strength analysis showed that the maximum stress 250.6 MPa was much greater than allowable stress 128 MPa. Then topology optimization of the bracket was carried out, which aimed at a new structural optimization bracket of minimum weight bracket subjected to stress constraints. Then the optimization bracket was verified by bench and road test. Finally, base on minimizing material use, the optimization bracket met strength requirement, succeeded in solving the fracture problem, and provided reference for solving similar engineering problem. References | Related Articles | Metrics

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Testing the Function Interaction between EPS Module and APA Module Based on CANoe Programming CHEN Shiping 2022, 47(7): 107-110.  DOI: 10.16638/j.cnki.1671-7988.2022.007.022 Abstract ( )   PDF (1505KB) ( )   The realization of automatic parking function on the whole vehicle requires the function interaction between auto matic parking assist (APA) module and electric power steering (EPS) module. Due to the different development cycle of the two modules, the cycle of function testing and verification on the real vehicle is longer. Therefore, a method of using CANoe to simulate the signal of the auto matic parking assist module and connecting to the actual hardware module of electric power steering module is proposed to realize the interactive test and verification method of the two modules. This article uses the development, testing and analysis functions of CANoe to create the electric power steering module DBC parsing file, define the parameters of each node and signal, and send the analog signals of parking assist module node and basic vehicle information node through the program control to realize the communication with electric power steering module.And based on the steering system bench, the test and verification of the example application are completed, which shows that the test method is feasible, which can not only reduce the cost of real vehicle testing, but also shorten the development cycle and improve the efficiency of electric power steering module and auto matic parking assist module interactive function development. References | Related Articles | Metrics

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Simulation Analysis of Automobile ABS Control ZHENG Xinwei 2022, 47(7): 111-115.  DOI: 10.16638/j.cnki.1671-7988.2022.007.023 Abstract ( )   PDF (1386KB) ( )   Using Matlab/Simulink software, the mathematical models of each subsystem of automobile Anti-lock Braking System (ABS) are established successively, and the logic gate limit control and (Proportional Integral Derivative, PID) control strategies are built. Then, the simulation model of ABS is formed by combining each subsystem model and control strategy, and the automobile ABS is studied. After entering the required parameters, the initial vehicle speed of 20 m/s and the target slip ratio of 0.2 are selected as the simulation conditions. Through the switching of the switch, the comparative simulation analysis with and without ABS and the comparison of the effect of using logic threshold and PID to control ABS are carried out respectively. The results show that the braking performance of the vehicle equipped with ABS is better, and the effect of PID control of ABS is better. References | Related Articles | Metrics

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The Optimization and Analysis of Heavy Vehicles Heat Damage YUN Pengfei 2022, 47(7): 116-119.  DOI: 10.16638/j.cnki.1671-7988.2022.007.024 Abstract ( )   PDF (1274KB) ( )   In order to alleviate the impact of the high temperature generated by the heat source on the driving safety of heavy-duty vehicles, ensure that the components arranged in the thermal field area work within a safe temperature range. This paper identifies the heat source of heavy-duty vehicles, tests the thermal damage of components in the heat source area, and proposes methods to avoid thermal damage. Based on thermal field analysis, this paper identifies the main factors and characteristics that affect thermal damage through experimental verification. At the same time, the thermal field is analyzed and optimized with the help of simulation analysis tools to avoid the occurrence of thermal damage to the whole vehicle, which has a certain guiding effect on the thermal protection of parts and components in the design and development process of heavy-duty vehicles. References | Related Articles | Metrics

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The Analysis of Acceleration Slip Regulation Simulation System Based on Fuzzy PI Control XIAO Xiao 2022, 47(7): 120-125.  DOI: 10.16638/j.cnki.1671-7988.2022.007.025 Abstract ( )   PDF (2740KB) ( )   In this paper, a driving anti-skid simulation system is proposed for the effective realization of driving anti-skid function of rear-wheel driven micro electric steam. In this system, the vehicle controller (VCU) uses fuzzy PI algorithm to control the motor driving force output, and realizes the control of wheel slip/slip ratio. In the process of anti-skid control, the driving anti-skid effect will be affected when the vehicle goes uphill due to the change of road slope. For this reason, the system designs the slope torque compensator, which provides the corresponding torque compensation according to the different slope value. The simulation results show that the system can effectively control the slip rate of the driving wheel and Improve the driving power and stability of rear-wheel drive micro electric vehicle. References | Related Articles | Metrics

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The Influencing Factors of Engine Bench Emission Test HUANG Wei 2022, 47(7): 126-130.  DOI: 10.16638/j.cnki.1671-7988.2022.007.026 Abstract ( )   PDF (4469KB) ( )   Engine bench emission test has strict requirements for test environment, test boundary, test equipment and test methods. This paper will analyze the influence of relevant factors on emission test results from the aspects of engine bench layout, emission equipment and report analysis. Carbon balance method is an important means to verify whether the whole emission test system is normal. This paper discusses the effects of system leakage, delay time and analyzer accuracy on it. The constant volume sampling equipment, filter paper weighing and intercooler which affect the particle test results are analyzed; Find out the failure reason of emission test by comparing the test results and analyzing the real-time data. References | Related Articles | Metrics

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A Method for Measurement and Calculation of the Catalyst Oxygen Storage Capacity HE Chao 2022, 47(7): 131-134.  DOI: 10.16638/j.cnki.1671-7988.2022.007.027 Abstract ( )   PDF (988KB) ( )   In the current years, the output of automobiles has been increasing year by year. The quality of automobiles has also become the key to an enterprise's success in the market. Whether the pollutants emitted by automobiles exceed the standard has also become an important indicator for determining the quality of automobiles. The three-way catalyst can oxidize automobile exhaust gas, convert the harmful gas in the exhaust gas into harmless gas, and then discharge it into the air. This can reduce environmental pollution, so the calculation of the oxygen storage in the catalyst becomes particularly important. The amount of stored oxygen is an important condition for determining the activity of the catalyst. This paper aims at this, and introduces a method for measuring and calculating the oxygen storage capacity of the catalyst. By using a working condition that can be easily reached to calculate the value of the oxygen storage capacity, the measured data is more accurate than other methods. Therefore, it can be more convenient to judge the pros and cons of the catalyst, which has an important role in judging the performance of the entire vehicle in actual work. References | Related Articles | Metrics

Process and Equipment

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Tolerance Analysis of Sliding Door at Open State LI Yuhu 2022, 47(7): 135-141.  DOI: 10.16638/j.cnki.1671-7988.2022.007.028 Abstract ( )   PDF (3083KB) ( )   After serie production of a vehicle model, the vehicle has the abnormal sound of upper hinge scratching upper guide rail, when sliding door is in the process of opening, the upper hinge of sliding door falls off from the upper guide rail. Based on software 3DCS, the close state and open state of sliding doors are studied to give optimization suggestions from parts tolerances, and find the most important contribution factors, matching surface tolerance of upper guide rail, matching surface tolerance of lower guide rail, tolerance of matching surface between sliding door inner panel and upper hinge and upper hinge roller profile tolerance which provide optimization direction and technical support for actual start production on site. References | Related Articles | Metrics

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The Efficiency Improvement Methods of Arc Welding Robot Production Lines YU Qian 2022, 47(7): 142-146.  DOI: 10.16638/j.cnki.1671-7988.2022.007.029 Abstract ( )   PDF (1116KB) ( )   In order to improve the welding production efficiency of arc welding robot production lines and meet the market demand, the influencing factors of arc welding robot production efficiency are studied and verified in detail. Taking the carbon dioxide gas shielded welding production line widely used in the automotive industry as the research object, this paper studies the influence of raw material accuracy, tooling fixture, robot welding program trajectory, welding program welding parameters, production line balance, gun cleaning program, weld quality and other factors on the welding production efficiency of the production line. Through several groups of comparative verification, it is confirmed that the main factors affecting the production efficiency are part accuracy, welding tooling, welding procedure and welding parameters.In the article, specific process improvement measures such as controlling part accuracy, optimizing welding tooling, optimizing welding procedures and welding parameters are put forward to ensure that the efficiency of K4 front axle arc welding line is increased by more than 20%. This kind of improvement method is also applicable to the efficiency improvement of arc welding production line of other automotive products, and has great reference significance. References | Related Articles | Metrics

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Balance Optimization of Automobile Door Line Production Based on IE Method DAI Linlin 2022, 47(7): 147-151.  DOI: 10.16638/j.cnki.1671-7988.2022.007.030 Abstract ( )   PDF (1378KB) ( )   This article use the theories and methods of basic industrial engineering to improve the problems of high load rate of automobile door line assembly workers and low work position balance rate. During the research process, based on program analysis and time measurement, the bottleneck position of the assembly line production capacity is found, and the "Eliminate, Combine, Rearrange, Simplify" method is used to analyze and improve the problems existing in the car door line in terms of task distribution, process content and tooling layout. After the improvement, the bottleneck station load rate drops to below 85%, and the line balance rate increases to 89%, effectively improving production efficiency and employee satisfaction. References | Related Articles | Metrics

Automobile Education

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Exploration on Course Education of Mechanical Manufacturing Technology HUO Wenguo 2022, 47(7): 152-155.  DOI: 10.16638/j.cnki.1671-7988.2022.007.031 Abstract ( )   PDF (957KB) ( )   Mechanical manufacturing technology is the core course of mechanical specialty. The ideological and political link in the teaching process is an effective improvement and an important measure to improve the quality of education. In this paper, the urgent needs of ideological and political teaching in the course of mechanical manufacturing technology are analyzed. This paper constructs the ideological and political teaching process system of mechanical manufacturing engineering series courses, and introduces how to improve the comprehensive ability of students by establishing the ideological and political teaching process and improving the teaching quality. Through the implementation of ideological and political teaching reform, the teaching quality of mechanical manufacturing technology is effectively improved. References | Related Articles | Metrics

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A Teaching Exploration of Advanced Driver Assistance System Course LI Junkai 2022, 47(7): 156-160.  DOI: 10.16638/j.cnki.1671-7988.2022.007.032 Abstract ( )   PDF (2722KB) ( )   Taking the automatic emergency braking system as an example, we improve the sciencereality integrated course in higher education colleges into a science-virtual-reality integrated course to explore the curriculum construction method of related majors in higher education colleges under the trend of automotive intelligence. Simulation is added to the teaching process as an important component to provide students with more opportunities to understand the course knowledge in depth. The actual teaching effect shows that the integrated course can improve students' interest in learning, reduce the difficulty of understanding, and improve the teaching quality of the advanced driver assistance system course, and provide a reference for the curriculum design of other similar courses. It also provides a reference for other similar courses. References | Related Articles | Metrics

Standards Regulations Management

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Research on Related Standards for Insulation Resistance Requirements of Electric Vehicles GAO Feng 2022, 47(7): 161-165.  DOI: 10.16638/j.cnki.1671-7988.2022.007.033 Abstract ( )   PDF (1064KB) ( )   Insulation resistance is one of the important technical parameter of electric vehicles to ensure human safety. When people touch with high-voltage live parts directly, the insulation resistance that meets some requirements can ensure human safety. Therefore, both domestic and foreign standards and regulations have requirements for these. Through the analysis and research of these standards based on the basic principles of electrotechnics, the logic and technical details of some of the clauses are open to be discussed, such as what circuit can be exempted from insulation resistance requirements, insulation resistance requirements and measurement methods, insulation resistance synthesis methods, and insulation monitoring alarm verification. Hope the analysis and research of this article can be used for future reference of standard revisions. References | Related Articles | Metrics

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Design of the Automobile Electronic Test Problem Management System ZOU Nan 2022, 47(7): 166-170.  DOI: 10.16638/j.cnki.1671-7988.2022.007.034 Abstract ( )   PDF (1641KB) ( )   With the development of automotive intelligence and networking, the proportion of automotive electronics in vehicle parts is gradually increasing. How to improve the efficiency of automotive electronic testing and high-quality management of testing problems are the challenges faced by the test engineers of major OEMs. Aiming at the problems involved in the process of automobile electronic test problem management, an automobile electronic test problem management system is studied and designed in this paper, which provides a systematic scheme to solve the problem of test problem management. References | Related Articles | Metrics

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Improvement Analysis of the Intersection of Guangqiao Road and Zhenyuan Road Based on VISSIM ZHU Yong 2022, 47(7): 171-174.  DOI: 10.16638/j.cnki.1671-7988.2022.007.035 Abstract ( )   PDF (2270KB) ( )   Through the morning rush hour traffic survey at the intersection of Guangqiao Road and Zhenyuan Road in Shenzhen, a VISSIM simulation model of the current situation was established, and congestion at signalized intersections were found. From the two aspects of intersection channelization design and signal timing, the improvement plan is proposed, and the three evaluation indicators of the average queuing length, the maximum queuing length and the average delay time of each entrance lane at the intersection before and after the improvement are compared and analyzed using VISSIM simulation. The results show that the improved plan shortens the length of the entrance lane queue, reduces the delay time, and improves the traffic efficiency of the intersection, which proves the rationality and effectiveness of the improved plan. References | Related Articles | Metrics

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A Method of Working Hours Balancing for Multi Model Mixed-line Production in Assembly Workshop KONG Lingneng 2022, 47(7): 175-180.  DOI: 10.16638/j.cnki.1671-7988.2022.007.036 Abstract ( )   PDF (1542KB) ( )   Generally, the automobile assembly workshop adopts the mode of multi model mixed-line production. Because the total working hours are different among the different models, and the production cycle time of the assembly line is generally fixed, so the number of assembly workers required is not the same when producing different models. In general, in order to ensure the normal operation of the production line, the production line staffing is based on the model of maximum working hours. So, when it is producted the model of the less working hours, there will be more staffs than the needed for production, which causes a waste of production resources. According to the principle of assembly line balancing, this paper proposes an innovative method of working hours balancing among different models by studying the production scheduling sequence and assembly working hours in the assembly workshop of G Automobile Factory, so as to optimize the allocation of assembly workers in the production line, eliminate waste and improve efficiency. Multi model mixed-line Production has become a common production mode in the automobile industry. The research results of this subject can provide relevant experience for other manufacturer. References | Related Articles | Metrics

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The Freight Transportation Path Problem under the Transfer Mode LV Li 2022, 47(7): 181-184.  DOI: 10.16638/j.cnki.1671-7988.2022.007.037 Abstract ( )   PDF (2106KB) ( )   At present, freight enterprises mainly adopt direct transportation. However, with the improvement of the requirements of the consignee on the supply chain, the existing transportation mode limits the development of the freight enterprises. In order to make full use of the existing highway transportation capacity, this paper studies the freight transportation path problem under the transfer mode, and expands the scope of transportation radiation. In order to solve this problem, this paper establishes a mathematical model aiming at the shortest transit time of all goods, and designs the corresponding algorithm. Finally, combined with the case data, the paper uses Python language to solve the transportation time of goods and get the optimal transportation path. It effectively reduces the transit time of road freight transportation, effectively reduces the cost of freight companies, and reduces the carbon emissions of trucks while meeting the needs of consignees. References | Related Articles | Metrics

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A Comparison between the Auto Industry and the Airline Industry LUO Yong, GUO Jing 2022, 47(7): 185-188.  DOI: 10.16638/j.cnki.1671-7988.2022.007.038 Abstract ( )   PDF (984KB) ( )   Under the guidance of ‘China Manufacturing 2025’ strategic planning, the fast development of the auto industry and the airline industry is an essential route for China’s basic manufacturing to follow to achieve a steady progress and a bright future. This essay made some contrastive analyses between both from the perspective of life cycle in terms of materials technology, manufacturing, marketing, practical application, etc. In order to clarify their respective advantages and disadvantages as well as to make recommendations on the development of manufacturing industry in our country, a comparative analysis of the auto industry with the airline industry is conducted. References | Related Articles | Metrics

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The Performance Development Goal of a Certain Typeof Vehicle Based on the Analysis of Competing Products ZUO Zhenyu 2022, 47(7): 189-193.  DOI: 10.16638/j.cnki.1671-7988.2022.007.039 Abstract ( )   PDF (1700KB) ( )   In order to determine the performance development goal of a certain vehicle, the competitive product analysis method is used to conduct research. Competitive product analysis objectives are determined in accordance with the purpose of learning and reference. Competitive product selection is completed on the condition of similar vehicles with a large market share. From the user's perspective, performance is chosen as the analysis dimension. Competitive product information is collected from a variety of ways. Competitive product information with relatively comprehensive and high credibility is obtained by collating information. The advantages and disadvantages of competive products are obtained through scoring comparison, so as to identify the overall performance level of competitive products. Finally, the vehicle performance development goals were preliminarily determined, which laid the foundation for the subsequent conceptual design of the vehicle. References | Related Articles | Metrics

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Site Selection and Distribution of Hazardous Chemicals Parking Lot WANG Yimeng 2022, 47(7): 194-199.  DOI: 10.16638/j.cnki.1671-7988.2022.007.040 Abstract ( )   PDF (1633KB) ( )   In order to improve the safety of hazardous chemical cargo transportation, improve transportation efficiency, and reduce carbon emissions, it is proposed to set up a hazardous chemical cargo parking lot near the highway close to the chemical industrial park. By analyzing the cross-section traffic volume, the situation of vehicles entering the upstream and downstream service areas, obtained the information on the proportion of hazardous chemicals transport vehicles, and learned that the traffic volume of hazardous chemicals freight vehicles here accounted for 14.39%, the rate of hazardous chemicals vehicles entering the upstream Pingdingshan service area was 4.28%, and that entering the downstream Fangcheng service area was 2.4%, and the parking lot for hazardous chemicals freight was constructed in a targeted manner to improve the overall standardization of the parking and transportation of hazardous chemicals vehicles. It is proposed to carry out drop and pull transportation and green distribution among the client, chemical industrial park and hazardous chemicals freight parking lot, which can effectively improve transportation efficiency and reduce pollution. References | Related Articles | Metrics

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A Review of Research Progress on Hydrogen Fuel Cell Components WANG Danke 2022, 47(7): 200-204.  DOI: 10.16638/j.cnki.1671-7988.2022.007.041 Abstract ( )   PDF (1188KB) ( )   The world is facing an energy crisis and an environmental crisis, hydrogen fuel cells are sought after due to their high energy conversion ratio and only water emissions.In recent years, the safety of hydrogen fuel cells has become the focus of research. This article discusses the research progress and commercialization of the main components of hydrogen fuel cells, and the safety comparison between hydrogen and other fuels. The different types, advantages and disadvantages and the latest research progress of the main components such as proton exchange membranes, bipolar plates and catalysts of hydrogen fuel cells were mainly introduced. The key points and safety of hydrogen fuel cells development at home and abroad are analyzed, and some suggestions are put forward for the country's future hydrogen energy development in terms of use cost and research technology. References | Related Articles | Metrics