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15 September 2022, Volume 47 Issue 17 Previous Issue    Next Issue
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
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New Energy Vehicle

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Optimization Analysis of the Front Longitudinal Beam Structure of a Pure Electric Vehicle YANG Zhenbo 2022, 47(17): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2022.017.001 Abstract ( )   PDF (1235KB) ( )   Taking the front longitudinal beam of a electric vehicle as the research object, this paper analyzes the key factors of failure in road test, carries out the road spectrum acquisition using three-component force sensor at the mounting points, comparison of pseudo damage and simulation of the structural strength. The original structure is optimized by using topology optimization technology to meet the performance requirements, while the bench durability test is designed and implemented to verify the effectiveness of the scheme. References | Related Articles | Metrics

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The Application of CLTC-P in the Range Test of Electric Vehicles LIU Peng 2022, 47(17): 7-13.  DOI: 10.16638/j.cnki.1671-7988.2022.017.002 Abstract ( )   PDF (1611KB) ( )   The driving range test standard of electric vehicles in China has always been carried out under New European Driving Cycle working conditions in Europe, and it is carried out under normal temperature conditions. There is a certain deviation between the standard and the actual driving range, the environmental temperature in China, which is also the main reason for the difference between the actual driving range and the announced driving range. In order to make the test results closer to the actual mileage of the vehicle, this paper took the China Light-Duty Vehicle Test Cycle-Passenger as the test condition curve, and carried out the range test of five mainstream electric vehicles. Considering the factors such as China's territory spanning multiple latitudes and the obvious temperature difference of four seasons in Northern China, the variation law of the range ability of electric vehicles under high and low temperature conditions was also studied. It is found that for electric vehicles, the test results of China Light-Duty Vehicle Test Cycle-Passenger and New European Driving Cycle are similar, but the environmental temperature will significantly affect the performance of electric vehicles such as range, power consumption and accuracy of announced mileage. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Unmanned Driving Behavior Decision Based on Ontology Knowledge Reasoning and BN CHANG Jiawei 2022, 47(17): 14-19.  DOI: 10.16638/j.cnki.1671-7988.2022.017.003 Abstract ( )   PDF (1053KB) ( )   Compared to high-speed and elevated road sections, driver's decision systems should face more complex and multi-change traffic road environments in urban roads. This paper proposes a method of combining the ontology knowledge and Bayesian Network (BN). By logic reasoning to the road environment body model, migrates to the structural parameters of BN, and constructs a complete construction Bayesian network according to historical driving cases and expert experience. Finally the best driving mode of the current scene is judged by BN. The present method can make the vehicle better judge the current optimal driving behavior. References | Related Articles | Metrics

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AEB Simulation Test Based on Comfort LIU Guoqing 2022, 47(17): 20-24.  DOI: 10.16638/j.cnki.1671-7988.2022.017.004 Abstract ( )   PDF (784KB) ( )   As an important vehicle active safety technology, automatic emergency braking system can assist the driver to avoid longitudinal collision. In order to further optimize the automatic emergency braking system, an optimization model considering the reaction time of the drivers and the comfort of the drivers and passengers was established based on Honda algorithm, and the Honda algorithm was compared with the original algorithm. The results show that the optimized model can keep a more appropriate distance from the front vehicle on the basis of effectively avoiding collision. The initial braking time is later under some working conditions, and the interference to the drivers is less, which basically meets the comfort requirements of the drivers and passengers. References | Related Articles | Metrics

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Analysis on Tire Tread Defect Detection Based on YOLOv5 Network WANG Penghui 2022, 47(17): 25-30.  DOI: 10.16638/j.cnki.1671-7988.2022.017.005 Abstract ( )   PDF (6927KB) ( )   At present, serious traffic accidents occur due to tire tread defects. Intelligent detection of tire tread defect is of great significance to avoid such traffic accidents. Deep learning technology has been used more and more in the field of target detection. This paper proposes an intelligent detection method of tire tread defect based on the convolutional neural network model YOLOv5. Firstly, the data set with four tire tread defect characteristics was established.Secondly,the data set was trained by YOLOv5 network. Finally, the trained network model was used to detect the tire tread defect on the test set. The experimental results show that the YOLOv5 network model has a mean average precision (mAP) of 65.4% and a detection speed of 38FPS in tire tread defect detection task, which is about 4.1% and 31.6% higher than YOLOv4 network model and Faster-RCNN network model, respectively. It provides a reference for further research on more effective intelligent detection methods for tire tread defect. References | Related Articles | Metrics

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Application of Parking Trajectory Planning of an Intelligent Vehicle GAO Tao 2022, 47(17): 31-35.  DOI: 10.16638/j.cnki.1671-7988.2022.017.006 Abstract ( )   PDF (891KB) ( )   Path planning is one of the key technologies of intelligent vehicle, in which path planning is the premise for intelligent vehicle to realize automatic parking. Based on Hybrid A*algorithm, this paper studies the parking trajectory planning of intelligent vehicles, solves the problem of repeated reversing or changing the driving direction when intelligent vehicles park through heuristic function optimization, and solves the problem of maintaining the safe distance of vehicles in parking through the improvement of collision detection strategy. Through MATLAB software simulation, the algorithm can realize the trajectory planning in the environment of reverse warehousing, side parking and path finding parking in the parking lot, which verifies the effectiveness and practicability of the improved algorithm. References | Related Articles | Metrics

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Real Vehicle Availability Evaluation Test Methods of IVI System Based on Users’ Scene ZHANG Cheng 2022, 47(17): 36-39.  DOI: 10.16638/j.cnki.1671-7988.2022.017.007 Abstract ( )   PDF (843KB) ( )   The actual vehicle road test with the user scenario as the core is an important part of the availability evaluation of the in-vehicle infotainment system, and the evaluation of this part is more subjective and therefore more difficult than the traditional in-vehicle infotainment system functional performance test. The core of the usability evaluation contains two parts: the evaluation scene and the evaluation dimension. The sufficient valuation scene can restore the actual usage completely and make the evaluation more directly and comprehensively. Evaluation dimension is the key point of assignment, which mentoring the evaluator in the progress of evaluation, so as to guide evaluators to perceive the advantages and disadvantages of the system. By combining the evaluation scenarios and evaluation dimensions, and applied it to the evaluation work of the actual vehicle in-vehicle infotainment system. It can effectively improve the perception and evaluation ability of evaluators, so as to make up for the defects of the expert evaluation method with high requirements for evaluation experience, and effectively improve the efficiency of testing and evaluation. Optimize the human-computer interaction design of the in-vehicle infotainment system from the perspective of vehicle verification. It will play a positive role in promoting the competitiveness of products in the in-vehicle infotainment system. References | Related Articles | Metrics

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Chassis Drive-by-wire System of Intelligent Connected Vehicle and Control Technology DUAN Hongyan 2022, 47(17): 40-45.  DOI: 10.16638/j.cnki.1671-7988.2022.017.008 Abstract ( )   PDF (662KB) ( )   With the gradual improvement of electrification technology of intelligent connected vehicle, the degree of chassis electronic control of intelligent connected vehicle has gradually increased. The chassis drive-by-wire technology belongs to the key technology of intelligent connected vehicle, which directly affects the safety and operational stability of vehicle, and is crucial for the development of intelligent connected vehicle. The reliability and safety of chassis driveby-wire technology of intelligent connected vehicle are the key direction for research and development of intelligent connected vehicle at this stage. Combined with the actual research, this paper discusses the composition and working principle of the four chassis drive-by-wire subsystems of intelligent connected vehicle (drive-by-wire steering, drive-by-wire drive, drive-by-wire brake and drive-by-wire suspension) and analyzes the control technology commonly used for chassis drive-by-wire of intelligent connected vehicle through full vector separate wheel control and integrated control architecture of drive-by-wire chassis of intelligent connected vehicle. This paper combines the fault tolerance control method of chassis drive-by-wire of intelligent connected vehicle, analyzes the current problems of chassis drive-by-wire technology of intelligent connected vehicle, and provides a reference for the control mode of chassis drive-by-wire of intelligent connected vehicle. References | Related Articles | Metrics

Design and Research

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Analysis and Improvement of Abnormal Noise Problem in Cab Suspension System of a Heavy-duty Truck LIU Jing 2022, 47(17): 46-50.  DOI: 10.16638/j.cnki.1671-7988.2022.017.009 Abstract ( )   PDF (2918KB) ( )   The cab suspension system plays an important role in improving the smoothness and comfort of the heavy-duty truck. In order to solve the pre-sale and after-sale abnormal noise problem in cab suspension system of a heavy-duty truck, based on more than 20 years of quality management work experience, this article introduces the use of quality tools, offline, online and road test verification, after-sale tracking and other measures to find out the root causes of frequent problems. The improvement measures for different problems are formulated and verified. Practice has proved that the measures are effective. This method can be used for reference by relevant workers. References | Related Articles | Metrics

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The Optimized Design of Composite Materials for the Frame Structure of Fuel-efficient Vehicles HUANG Yonghu 2022, 47(17): 51-55.  DOI: 10.16638/j.cnki.1671-7988.2022.017.010 Abstract ( )   PDF (2843KB) ( )   The purpose of optimizing the frame structure design of electric energy saving vehicle is mainly to improve energy saving and environmental protection by lightweight. The frame model for lightweighting design is established according to the Shell Eco-marathon race rules. The ANSYS Composite Prep/Post composite material module is applied to study the frame of aluminum honeycomb panels, and the displacement and stress distribution of the frame baseplate are obtained through static analysis. Altair Inspire is adopted to obtain the overall driving situations of frame under different working conditions. Based on the above results, the optimum structural design of the frame is conducted. The article introduces the application of composite aluminum honeycomb panels in fuel-efficient vehicles, provides reference value for the feasibility of composite materials in this aspect. References | Related Articles | Metrics

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Architecture Design of Vehicle-Road Collaborative Cloud Control Platform for Expressway Operation Management Unit LI Yan 2022, 47(17): 56-61.  DOI: 10.16638/j.cnki.1671-7988.2022.017.011 Abstract ( )   PDF (1568KB) ( )   With the development of automatic driving technology, China has defined the technical development path of vehicle road coordination based on its own national conditions and advantages. Compared with the design of the existing cloud control platform, the article makes it clear that the expressway operation and management unit is the service object. Through sorting out the vehicle road collaborative application scenarios, the functional architecture and technical architecture of the cloud control platform are derived, various data resource items are refined, the recommended driving speed threshold is specified, and the key control data items and equipment collaborative control methods are listed according to the ramp inflow scenario. In order to improve the road management and control ability, achieve the goal of safety, convenience, high efficiency, green and economy is to provide practical technical solutions. References | Related Articles | Metrics

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Calculation and Matching of Rolling Angle Stiffness for Commercial Vehicle Suspension WANG Qi 2022, 47(17): 62-67.  DOI: 10.16638/j.cnki.1671-7988.2022.017.012 Abstract ( )   PDF (2166KB) ( )   This paper analyzes the theoretical calculation and design matching method of roll stiffness for commercial vehicle suspension. The method of determining roll center of various types of commercial vehicle suspension is introduced in detail, and the composition of roll moment and calculation method of roll stiffness are analyzed. The relationship between the roll stiffness and the ride comfort and handling stability is discussed. The influence of the roll stiffness distribution of the front and rear suspension on the understeer is analyzed. The proposal of the proportion of the roll stiffness distribution of the front and rear axles of commercial vehicles is made. The results can be applied to the optimal design of commercial vehicle suspension to improve vehicle driving performance. References | Related Articles | Metrics

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Analysis on Working Principle of Emergency Safety Device of Mechanical Tire Blowout for Automobiles LI Chongtian 2022, 47(17): 68-72.  DOI: 10.16638/j.cnki.1671-7988.2022.017.013 Abstract ( )   PDF (2218KB) ( )   In view of the risk of automobile tire blowout and the non-repeatability of real tire blowout accidents, this paper established the additional yaw moment model of the tire blowout, and analyzed it in combination with the internal composition structure of tire and tire blowout emergency safety device, tire blowout road accident and relevant tests. The results show that the additional yaw moment of the vehicle will increase greatly after the tire blowout, which will affect the vehicle handling stability, but this increase is not reflected in the steering wheel. As a control loop, the driver and the vehicle with mechanical tire blowout emergency safety device control the vehicle with low requirements for the driver in case of tire blowout, so as to realize the emergency safety in case of tire blowout. References | Related Articles | Metrics

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Dynamic Characteristics of Gear Transmission System of a New Energy Reducer LUO Ruitian 2022, 47(17): 73-80.  DOI: 10.16638/j.cnki.1671-7988.2022.017.014 Abstract ( )   PDF (2268KB) ( )   In order to explore the influence of external excitation and parameter excitation on the dynamic characteristics of gear transmission system of new energy reducer, a four degree of freedom dynamic model of gear system of two-stage reducer is established based on the principle of gear dynamics and comprehensively considering the factors such as time-varying meshing stiffness, static transmission error and gear backlash. The time-varying meshing stiffness of gear pair is calculated by potential energy method, and the static transmission error of gear pair is calculated by slice method. The Runge Kutta method is used to solve the model, and the time history diagram, FFT spectrum diagram, phase diagram and Poincare diagram are obtained. The research results of gear dynamic response show that with the increase of torque fluctuation, the FFT amplitude of relative displacement gradually increases, and the excitation frequency gradually becomes the main contribution source of relative displacement fluctuation. The average meshing stiffness and torque fluctuation have a great impact on the gear dynamic response. With the increase of the average meshing stiffness, the gear relative displacement fluctuation decreases, and the system motion changes from hybrid motion to almost periodic motion. References | Related Articles | Metrics

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Detection and Recognition of Test Cell Entrance Based on Machine Vision XIONG Xingwang 2022, 47(17): 81-84.  DOI: 10.16638/j.cnki.1671-7988.2022.017.015 Abstract ( )   PDF (1466KB) ( )   Aimed at using forklift transporting goods into the test cell in the test park, a test cell entrance detection and recognition method based on machine vision is proposed. Using edge detection and Hough line detection algorithm, screening and optimization are carried out according to the characteristics of the detection targets. The function of detecting and recognizing test cell entrance is realized, which is of certain engineering value for the development of intelligent forklift auxiliary system. References | Related Articles | Metrics

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Rear Axle Toe-in Optimization by Four-wheel Alignment LIU Jialin 2022, 47(17): 85-89.  DOI: 10.16638/j.cnki.1671-7988.2022.017.016 Abstract ( )   PDF (4293KB) ( )   Four-wheel alignment is a significant parameter to ensure that the vehicle has good driving performance. Testing and adjusting it effectively has important implications for improving the safety and economy of vehicles. This paper mainly analyzes the parameters of rear axle toe-in in the four-wheel alignment. In this paper, the parameters of rear axle toe-in were adjusted at the supplier first, then were tested at the vehicle factory. Due to the high adjustment rate of the rear wheel toe-in in the factory, the workload of the workers is greatly increased. This paper used 6 Sigma method to solve the actual issues of rear wheel toe-in. Through checking and analyzing the process from supplier to vehicle factory, and a series of definition, measurement, analysis, improvement and control, the several parameters causing problems were found out step by step. After improving and controlling the parameters, the adjustment rate of rear wheel toe-in was reduced, and the problem of low efficiency caused by similar reasons was reduced in the future. References | Related Articles | Metrics

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The Whole Package Program Refresh Mode of Automobile Liquid Crystal Composite Instrument LI Xuemei 2022, 47(17): 90-94.  DOI: 10.16638/j.cnki.1671-7988.2022.017.017 Abstract ( )   PDF (902KB) ( )   With the increasingly wide application of liquid crystal instrument in automobiles, the refresh of different versions of instrument software in automobiles is more difficult. Based on those, this paper briefly analyzes and expounds the whole package program refresh mode of automobile liquid crystal display (LCD) composite instrument through central control, hoping to provide an effective reference, so as to solve the problem of continuous refresh of automobile composite instrument software. References | Related Articles | Metrics

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Improved Technology of Diaphragm Pump Based on Guide Rail Slider WANG Jun 2022, 47(17): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2022.017.018 Abstract ( )   PDF (1651KB) ( )   Diaphragm pump is the core power element of air source heat pump. Diaphragm pump plays an important role in the performance of the air source heat pump because of its flow, energy consumption and external volume. The current diaphragm pump structures are all plunger pumps. Although this traditional structure operates smoothly and has simple processing technology, it has the disadvantages of high energy consumption and large external volume, which can not meet the high index requirements of users for air source heat pumps. In view of the current problems of the diaphragm pump, the linear guide rail is applied to the pump structure through mathematical theoretical analysis and three-dimensional modeling and other research methods to replace the traditional spring cam structure and connecting rod structure. After calculation and analysis, the new structure of the diaphragm pump can save 2% of the power in the work, which is helpful to improve the energy efficiency of the air source heat pump unit. At the same time, the new structure also reduces the overall size of the diaphragm pump, The floor area of the air source heat pump unit is correspondingly reduced, which also makes it more widely used and has better practicability. References | Related Articles | Metrics

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Research on Industrial Robot Assembly System Controlled by PLC YANG Jingwen 2022, 47(17): 100-104.  DOI: 10.16638/j.cnki.1671-7988.2022.017.019 Abstract ( )   PDF (1701KB) ( )   This design is based on Siemens S7-1200 programmable logic controller (PLC) to control Huibo HR20-1700-C10 robot to assemble a set of motor model. The hardware and software of the PLC controlled assembly system are designed and analyzed. The assembly system is mainly composed of transportation line, assembly line, industrial robot and assembly workpiece. The paper also introduces the selection of robot and PLC, and completes the programming of PLC and on-line simulation debugging. Through reasonable program design and man-machine interface, the assembly line assembly system can be accurately controlled. References | Related Articles | Metrics

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Analysis of Control Strategy and Failure Mode of Fuel Gauge for Type A Automobile HE Zhaoxia 2022, 47(17): 105-108.  DOI: 10.16638/j.cnki.1671-7988.2022.017.020 Abstract ( )   PDF (1885KB) ( )   When the vehicle is running, the fuel is gradually consumed, which will cause the oil level to drop. The liquid level sensor in the fuel tank transmits the current resistance value to the fuel pump control unit through the wiring harness. The fuel pump control unit will calculate the remaining fuel through internal filtering processing. At the same time, the engine control unit transmits the current fuel consumption value of the engine to the fuel pump control unit. According to the comprehensive calculation of these two sets of values, a remaining fuel quantity value is obtained, and the remaining fuel quantity value is transmitted to the combination meter for display. The driver can obtain the current remaining fuel quantity information in time through the combination meter fuel gauge. The problem caused by the failure of the fuel display of the car's fuel gauge has caused great safety hazards to the driver and passengers. This article starts with the fuel display system of faulty model A,studies the structure and working principle of the fuel pump, the principle of data transmission between the level sensor and the displayed value of the fuel gauge, and clarifies the calibration value display value of the fuel gauge of model A between the output resistance of the level sensor. The main factors affecting the accuracy of the fuel gauge are analyzed and summarized. References | Related Articles | Metrics

Testing and Experiment

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Comparison of Fuzzy PID and PID Control Strategies Based on ESP FENG Yanhong 2022, 47(17): 109-112.  DOI: 10.16638/j.cnki.1671-7988.2022.017.021 Abstract ( )   PDF (1210KB) ( )   Electronic stability program (ESP) is a kind of safety technology. In this paper, a twodegree-of-freedom model of the vehicle was established by MATLAB/Simulink, and the differential control of the additional yaw moment was carried out by combining the fuzzy proportion integral differential (PID) and PID with ESP. The co-simulation model was built by CarSim and Simulink, and the angular step signal and sinusoidal signal were used as the steering wheel input respectively. The stability of the vehicle was judged by observing the yaw speed of the vehicle. It is found that fuzzy PID is better than PID in improving vehicle stability, which provides a certain reference for the research of ESP. References | Related Articles | Metrics

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Deformation Analysis of Overrunning Clutch Based on Finite Element Method DUAN Xiangyu 2022, 47(17): 113-116.  DOI: 10.16638/j.cnki.1671-7988.2022.017.022 Abstract ( )   PDF (1426KB) ( )   The overrunning clutch is a fundamental part of the power transmission system. Its deformation under the actual working conditions will have a great influence on the deformation and return difference of the entire mechanical transmission system,so it is particularly important to carry out simulation analysis on it. In this paper, the finite element software ABAQUS is used to simulate the clockwise and counterclockwise working conditions of the overrunning clutch when the fork is the driving member, and stress cloud diagram of the overrunning clutch is obtained. The results show that the strength of the parts meets the requirements. The simulation calculation based on ABAQUS can provide the basis for the structural optimization design of the overrunning clutch. References | Related Articles | Metrics

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Efficiency Simulation and Optimization Analysis of Hybrid Transmission System for Hybrid Power LIANG Yinghua 2022, 47(17): 117-125.  DOI: 10.16638/j.cnki.1671-7988.2022.017.023 Abstract ( )   PDF (1211KB) ( )   The electromechanical coupling system for hybrid power is different from the traditional gearbox, including mechanical transmission components, motors, motor controllers and other components, and it is difficult to simulate the efficiency of each mode. This paper proposes a new method of system efficiency simulation, that is, calculating the efficiency of mechanical transmission components through KISSsoft, testing the clutch drag, mechanical pump loss, motor and motor controller loss through a single bench, comprehensively calculating the efficiency of each mode of electromechanical coupling system. Then the bench test of the electromechanical coupling system assembly was used to verify the effectiveness of the simulation. Through the efficiency simulation and bench test of the assembly, the proportion of the loss of each component in the total system loss was analyzed, and the key factors affecting the efficiency were found. The method for improving the efficiency was proposed in a targeted manner, and effective measures were formulated to improve the system efficiency. This paper proposes an efficiency simulation method and some efficiency improvement measures suitable for electromechanical coupling system for hybrid power, which has an important engineering application value for the development of electromechanical coupling system for hybrid power. References | Related Articles | Metrics

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Simulation Analysis Method of Fatigue Bench of Anti-roll Bar for a Vehicle YU Dongna 2022, 47(17): 126-129.  DOI: 10.16638/j.cnki.1671-7988.2022.017.024 Abstract ( )   PDF (1204KB) ( )   The simulation calculation and test comparison were analyzed based on fatigue bench test for anti-roll bar of a vehicle. Combined with the function of multidisciplinary engineering auxiliary software, the simulation results are basically consistent with the test results, and the fatigue life of the optimized anti-roll bar meets the target requirements. This paper summarizes a set of simulation analysis process on fatigue endurance bench test of anti-roll bar with high precision, which provides an important theoretical basis for shortening product development cycle. References | Related Articles | Metrics

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The Influence of Wheel Structure on the Heat Dissipation Performance of Brake Disc ZHAI Huihui 2022, 47(17): 130-135.  DOI: 10.16638/j.cnki.1671-7988.2022.017.025 Abstract ( )   PDF (2386KB) ( )   The structure of automobile rim directly affects the airflow movement in the wheel area, and then affects the heat dissipation characteristics of the wheel brake disc. In order to explore the influence of rim structure on the heat dissipation performance of brake disc, three kinds of rim structures, narrow spoke rim, wide spoke rim and fully enclosed rim, were selected as the research objects to realize the change of rim opening area. The influence of different rim structures on the flow field of wheel area and the heat dissipation performance of brake disc was analyzed by computational fluid dynamics. The results show that the size of the rim opening area is positively correlated with the heat dissipation efficiency of the brake disc. Increasing the rim opening area will enhance the air flow in the wheel area, and the corresponding heat dissipation area will increase. The research results provide guidance for the optimization and improvement of wheel design and automobile brake disc heat dissipation. References | Related Articles | Metrics

Process and Equipment

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Discussion on Cleanliness Process Control of Automatic Transmission Hydraulic System REN Xiang 2022, 47(17): 136-140.  DOI: 10.16638/j.cnki.1671-7988.2022.017.026 Abstract ( )   PDF (1271KB) ( )   At present, the control module of automatic transmission generally adopts hydraulic system, and the core part of the hydraulic system is solenoid valve, which has high requirements for cleanliness. If the cleanliness requirements are not met, the solenoid valve may be stuck, and then the function of the hydraulic system will fail. Therefore, compared with other systems, the hydraulic system has higher requirements for cleanliness. This control requirement is difficult to achieve through general process implementation. This paper introduces some common cleanliness process control processes and methods to make the cleanliness of the whole system meet the requirements. In the manufacturing process of parts, appearance inspection and on-line cleaning are adopted, and cleanliness indexes of parts are regularly tested. Strictly control the assembly process to prevent secondary pollution. In the testing stage, the cleanliness level of lubricating oil itself is improved by improving the circulating oil filtration system. Through these methods, the cleanliness of the whole system can be controlled at a qualified level. This paper expounds the process control method of cleanliness in the whole process, from incoming inspection standards, cleaning process, inspection standards, assembly precautions to the control requirements of the final test process. References | Related Articles | Metrics

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Therbligs Analysis and Job Balance Standard of Rear Axle Differential Main Ring Assembly Line FENG Le 2022, 47(17): 141-145.  DOI: 10.16638/j.cnki.1671-7988.2022.017.027 Abstract ( )   PDF (1183KB) ( )   With the continuous expansion of China’s infrastructure construction scale, the demand for heavy-duty vehicles has also increased, and the demand for the rear axle assemblies of the matching vehicles has also increased. Although the company’s existing assembly line has made some improvements in response to the market's demand for production capacity and product diversity, there are still problems. According to the status quo of the assembly line, starting from the operator’s space comfort and safety, this article focuses on human factors engineering, logistics optimization and other methods to improve the assembly line. At the same time, the four principles of motion analysis are used to summarize and analyze the assembly motions of each operation in the main ring station of the assembly line to establish operating standards. After improvement, the balance rate of the assembly line increased from 82.3% to 96.9%, and the actual daily output of the assembly increased from 536 roots to 650 roots. References | Related Articles | Metrics

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Application of Integrated ECRS Method and MTM Method in Automobile Manufacturing Plant LI Hua 2022, 47(17): 146-150.  DOI: 10.16638/j.cnki.1671-7988.2022.017.028 Abstract ( )   PDF (1341KB) ( )   The automobile industry is the pillar industry of the national economy, in the automobile industry competition is increasingly fierce today, reducing the cost is particularly important. The braiding efficiency is an important index to evaluate the production efficiency, but also an important factor to reduce the cost, so it is very important to improve the braiding efficiency by scientific and reasonable methods. In this paper, firstly, guided by the principle of action economy, and with the help of MTM method, the working hours of each station are analyzed. Secondly, the line body balance wall is formed according to the result of working hours. Thirdly, in view of the bottleneck station in the balance wall, the ECRS method is used to formulate the solution, and the work content of each station is recombined and optimized, so as to eliminate the bottleneck and balance the process. Finally, the optimization effect is solidified to form a closed-loop management. This paper provides a scientific and effective method for reducing manufacturing cost and improving production efficiency, and provides a reference for other manufacturing enterprises to improve efficiency. References | Related Articles | Metrics

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Multi-robot Obstacle Avoidance Algorithm Developed for Body Digital Process ZENG He 2022, 47(17): 151-156.  DOI: 10.16638/j.cnki.1671-7988.2022.017.029 Abstract ( )   PDF (1480KB) ( )   Under the background of the rapid transformation of the manufacturing process of the automobile industry to "digitalization" and "intelligence", the automatic development technology of manufacturing process has received extensive attention from academy and industries. Aiming at the problem of automated process path planning in multi-robot stations in the vehicle body manufacturing process, a dynamic collision detection and coordination path planning algorithm are proposed for multi-robot system based on intelligent algorithms. Aiming at the problem that the local path planning time of the existing robot arm is long in the complex multi-obstacle environment, an improved APF-RRT* robot obstacle avoidance method is proposed to shorten the iteration times of algorithm and the total length of the path, realize the optimization of the local path, and improve the search efficiency of the local obstacle avoidance algorithm. References | Related Articles | Metrics

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Development and Application of Vehicle Error-proofing System Based on Visual Technology Integration JIN Zhihao 2022, 47(17): 157-161.  DOI: 10.16638/j.cnki.1671-7988.2022.017.030 Abstract ( )   PDF (2161KB) ( )   As consumers become materially richer, so do their spiritual lives.In order to meet the needs of consumers, automobile design is becoming more and more diversified in configuration, function and entertainment system, vehicle configuration, functions, entertainment facilities are also diversified and personalized design. In the automobile assembly workshop, the main quality control measures are still personnel inspection, and the diversified and personalized configuration requires higher overall skills of personnel. In order to reduce the risk of wrong inspection and missing inspection, the visual inspection system described in this paper can solve this risk. Visual inspection system is the use of programmable logic controller industrial control technology to control the visual lens, in the production line to obtain evidence of the entity, and then compare in the background database, and then identify the wrong installation, missing installation and other quality problems,through real-time display and alarm, remind maintenance personnel to deal with quality problems.At the same time, the system has deep learning function, can horizontally expand the database and other functions. The results show that the research and popularization of visual inspection system can reduce the input of production line personnel and promote the application of automation and intelligence in manufacturing industry. References | Related Articles | Metrics

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Car Body Lower Assembly Drop Deformation Virtual Assessment Analysis and Structure Optimization HAO Liangwei 2022, 47(17): 162-165.  DOI: 10.16638/j.cnki.1671-7988.2022.017.031 Abstract ( )   PDF (1469KB) ( )   In the process of automotive product development, preliminary virtual assessment for each production stage can identify risks in advance, shorten the overall project development cycle, and reduce product development cost. This paper applies the finite element simulation technology to the handling process of the body-in-white assembly, predicts and analyzes the risk point of the drop deformation, and finds out the deformation risk near the positioning hole of the lower assembly. According to the analysis results, the optimization and improvement plan is proposed and verified by simulation. The verification results show that the product design optimization and the improvement of the connection process can effectively reduce the stress of the parts during the placement process, avoid the permanent placement deformation defect, ensure the strength of the vehicle and the positioning accuracy of the lower assembly, and reduce the cost of post-repair and debugging. It is significant to improve the level of intelligent manufacturing of car body and reduce manufacturing cost by identifying manufacturing quality risks in the early product design stage, guiding product design, and avoiding the flow of quality risks to the physical vehicle manufacturing stage. References | Related Articles | Metrics

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Cracking Analysis of 700 MPa Grade Girder Steel During Roll Forming LI Zhihui 2022, 47(17): 166-170.  DOI: 10.16638/j.cnki.1671-7988.2022.017.032 Abstract ( )   PDF (2341KB) ( )   In order to explore the cause of roll cracking of 700 MPa grade large beam steel in a commercial vehicle main engine plant, systematic analysis was carried out by means of material microstructure observation, fracture scanning, mechanical property testing and low power analysis. The results show that the main reason for the bursting or cracking of U-shaped beams in the process of slitting and rolling is that the strength of the material is too high, and the pearlite segregation and nitride inclusion in the center of the material thickness exacerbate the cracking tendency of the material. By controlling material strength, reducing nitride inclusion and controlling segregation zone in the center of billet, cracking of the material in the process of rolling can be effectively avoided. References | Related Articles | Metrics

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Analysis and Control of Water Leakage in Car Doors YIN Hanhan 2022, 47(17): 171-174.  DOI: 10.16638/j.cnki.1671-7988.2022.017.033 Abstract ( )   PDF (1408KB) ( )   The door sealing system is the key to the sealing of the whole vehicle. Once the door leaks, it will have a very serious impact on customers and car manufacturers. This article introduces the water leakage fault of a heavy-duty vehicle door system, explains in detail the various causes of door water leakage and rectification measures, and analyzes the process of door water leakage, the route of door water entry, and the failure cause of door sealing system. It is determined that the door sealing system is not only related to the structure of the weather strip, but also to the coordination of the side panel sheet metal parts. The control of the gap between the door and the side panel sheet metal directly affects the compression area of the sealing strip and the change of the compression load. The case study provides a powerful reference for the later design of the door sealing system. References | Related Articles | Metrics

Automobile Education

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Practice and Reflection on the Ideological and Political Construction of the Course Automobile Insurance and Claims Settlement LI Fengqin 2022, 47(17): 175-178.  DOI: 10.16638/j.cnki.1671-7988.2022.017.034 Abstract ( )   PDF (1192KB) ( )   The foundation of colleges and universities lies in Building Morality and cultivating people, must take improving morality and cultivating people as the central link and the ideological and political work should be carried through the whole process of education and teaching. Taking the course of automobile service engineering “automobile insurance and claim settlement” as an example, the paper delves into the elements of ideological and political education, studies the effective methods of integrating ideological and political education into professional courses, and makes use of information-based teaching methods, in the teaching process of professional courses, professional courses and ideological and political courses go together to form a synergistic effect. References | Related Articles | Metrics

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Analysis of the Vertical and Horizontal Classification of the Curriculum System of Automotive Electronics Technology Major Integrated into the Professional Direction ZHAO Ruzhun 2022, 47(17): 179-183.  DOI: 10.16638/j.cnki.1671-7988.2022.017.035 Abstract ( )   PDF (1375KB) ( )   Aiming at the problems of overlapping and repeated course content, incoherent knowledge points, chaotic opening semesters and difficult course management in college majors, this paper proposes a vertical and horizontal classification of the curriculum system integrated into the professional direction. The study takes the automotive electronics technology major of the automobile college as an example. The vertical classification principle is from basic knowledge to occupational application, and horizontally, the occupational orientation course classification is the principle. The vertical and horizontal classification network forms are formed. The curriculum of automotive electronics technology major for 2021 class of automobile college are filled into the corresponding grid, then the unreasonable course structure is analyzed for reconstruction. Through practice, this method can obtain a clear curriculum structure, which has a good effect on the reconstruction and management of the curriculum system, and has a certain promotion value. References | Related Articles | Metrics

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Development of Virtual Teaching System for Automobile Structure Disassembly and Assembly Training Course SONG Xiaoyan 2022, 47(17): 184-187.  DOI: 10.16638/j.cnki.1671-7988.2022.017.036 Abstract ( )   PDF (1766KB) ( )   Aiming at the disadvantages of the course of automobile structure disassembly and assembly training in the traditional teaching process, a virtual simulation teaching system with authenticity is designed and developed. Through this system, students can simulate the main disassembly and assembly items of automobile disassembly and assembly training. The operation is simple. Students can complete the operation of the training course through the mouse and keyboard. Without the limitation of equipment, site and other conditions, students can truly master the main structure of the automobile and the installation position of each structure, so as to realize from theoretical cognition to real simulation teaching. References | Related Articles | Metrics

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Hybrid Teaching Model Exploration on “Modern Enterprise Management” Course Under the Concept of OBE YU Zailiang 2022, 47(17): 188-191.  DOI: 10.16638/j.cnki.1671-7988.2022.017.037 Abstract ( )   PDF (1015KB) ( )   In order to adapt to the situation of teaching reform in colleges and universities, our school has also made bold attempts in some basic courses and professional courses. Under the concept of outcome based education (OBE) education, combined with teaching experience, the problems in the teaching process were analyzed, and reform attempts were made in formulating teaching objectives, optimizing teaching plans, students' passive learning and optimizing assessment methods, then good results were achieved. The student-centered teaching concept has been initially formed. The enthusiasm of students to learn spontaneously has been significantly improved. The innovative ideas have penetrated into all aspects of learning and life, and the ability to transform knowledge into behavior has been solidified. The experience of this teaching reform also provides a reference for the reform of other teachers' subsequent courses, and provides a reference for the reform of all courses in the school in the future. References | Related Articles | Metrics

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On the Cultivation of Common Professional Ability of Automobile Technology Specialty WANG Zirui 2022, 47(17): 192-195.  DOI: 10.16638/j.cnki.1671-7988.2022.017.038 Abstract ( )   PDF (1269KB) ( )   Through the implementation of 1+X professional skill level certificate system, the professional ability of graduates majoring in automobile application and maintenance technology has been greatly improved. After the implementation of the pilot work, the training of students' professional ability is closer to the needs of employers, and the description of common professional competence generally accepted by automotive technology employing enterprises is obtained by means of survey interviews and questionnaires. A study of the characteristics of students' common professional competence with sustainable development in the industry realm, we come to the conclusion that it is very important to cultivate the common professional competence with better professional adaptability and outstanding performance in the life-long professional life, which provides experience for future skills assessment-oriented evaluation mechanism of vocational education and optimize skills assessment project. References | Related Articles | Metrics

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The Function of Car Seat and Its Development Trend XU Hao 2022, 47(17): 196-199.  DOI: 10.16638/j.cnki.1671-7988.2022.017.039 Abstract ( )   PDF (1741KB) ( )   In order to better meet passengers requirements for car seats, this paper discusses the basic functions that car seats should have. And pointed out that with the improvement of passengers requirements for car functions, car seats are developing in the direction of intelligence, better comfort and perception, entertainment and seat customization and personalization. This paper has guiding significance for the design of car seats. References | Related Articles | Metrics

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On the Current Situation and Trend of China's Automobile Energy Consumption CHEN Qiaorong 2022, 47(17): 200-204.  DOI: 10.16638/j.cnki.1671-7988.2022.017.040 Abstract ( )   PDF (1123KB) ( )   Based on environmental protection and sustainable development requirements, all countries have mandatory and clear requirements for automobile energy consumption. How to reduce the energy consumption is one of the main research topics of the current major automobile enterprises. On the basis of the research related data combined with the current automobile development existing technology on the current market of the automobile emission reduction technology analysis and arrangement, this article mainly introduces the current market mainstream of five energy conservation and emission reduction way: body lightweight, improve the thermal efficiency of engine, adopt engine hybrid technology, develop energy recovery system and low wind resistance coefficient. The development of automobile consumption reduction technology requires the cooperation between different automobile enterprises, any enterprise cann't independently study a certain technology, and needs to explore different technologies at the same time. At present, China's automobile free brands are actively exploring related technologies, which will certainly drive the technological innovation and economic growth of China's automobile industry in the future. References | Related Articles | Metrics