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30 January 2022, Volume 47 Issue 2 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 Parameter Matching of Electric Drive System of Pure Electric Sanitation Vehicle ZHAO Jinbao 2022, 47(2): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2022.002.001 Abstract ( )   PDF (1503KB) ( )   Pure electric sanitation vehicle has become an important part of urban daily life. In order to improve its power performance and operation efficiency, this paper takes a pure electric sanitation vehicle with multi-mode high-efficiency electric drive system configuration based on the integration of parallel shaft gearbox and planetary row as the research object. Firstly, the mode that the system can realize is analyzed, Secondly, taking the whole vehicle parameters and dynamic performance of the pure electric sanitation vehicle as the index, the peak value, rated power, torque and maximum speed of the driving motor and working motor are matched respectively, and the whole vehicle dynamic model is built. The effectiveness of the system parameter matching is proved by simulation analysis and the climbing and acceleration ability test of the system bench. References | Related Articles | Metrics

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Analysis of Insulation Failure of Compressor Contactor of a New Energy Vehicle ZHANG Yanxing 2022, 47(2): 7-10.  DOI: 10.16638/j.cnki.1671-7988.2022.002.002 Abstract ( )   PDF (2686KB) ( )   For solving effectively the contactor insulation problem during the use of the compressor of a mass produced electric car, in this paper, the reason for the failure was determined by experiments that the filter capacitor at the input end of the electric air conditioning compressor was not taken into account, which resulted in a large impulse current at the start moment of the air conditioning compressor and the copper plate ablation at the contact point. Based on the standard control circuits of several popular pure electric vehicle compressors, the circuits of mass production models were corrected in accordance with the principle of minimum modification and effective solution to the problem, and the pre-charging control circuit was added to the existing air conditioning circuit. The analysis results of this paper provide effective ideas for the design of air conditioning control loop of other car models to avoid insulation problems caused by large current impact. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Vehicle-borne Network Communication System Based on Flexray Bus HUANG Xiaopeng 2022, 47(2): 11-15.  DOI: 10.16638/j.cnki.1671-7988.2022.002.003 Abstract ( )   PDF (1251KB) ( )   With the automobile coming into an era of intelligence and electrification, the demand for vehicle-borne network technology is getting higher and higher. As the bus system of a new generation, FlexRay is applied more and more. This paper analyzes the advantages, topological structure and timeliness of Flexray vehicle-borne network system, moreover, it summarizes the specific application of Flexray vehicle-borne network system in vehicles, and explores the development trend of vehicle-borne network technology. References | Related Articles | Metrics

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Lightweight Object Detection Algorithm for Underground Parking ZHANG Xiaojun 2022, 47(2): 16-19.  DOI: 10.16638/j.cnki.1671-7988.2022.002.004 Abstract ( )   PDF (1469KB) ( )   The object detection algorithm based on deep learning cannot achieve good detection speed without the support of high-performance GPU hardware devices. However, the hardware equipment with high performance, high power consump-tion and large size in the intelligent car does not conform to the concept of long endurance of the car. Therefore, this paper takes YOLOV3 object detection algorithm as the baseline model for improvement, proposes a lightweight object detection model, Mobile-YOLO, and conducts training and testing in the collected and produced underground parking lot dataset. The experimental results show that compared with Yolov3, the proposed Mobile-YOLO has a 47.1% increase in detection speed with a slight increase in the mean accuracy. It can detect 31 images per second on the mobile terminal platform TX2. References | Related Articles | Metrics

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Lane Detection Based on Traditional Image Processing Algorithm ZHANG Yong 2022, 47(2): 20-23.  DOI: 10.16638/j.cnki.1671-7988.2022.002.005 Abstract ( )   PDF (3416KB) ( )   With the rapid development of autonomous driving technology, lane line detection has also become critical. Based on this, a lane line detection method based on traditional image processing algorithms is proposed. This method uses the filtering algorithm, Canny edge detection algorithm and Hough line detection algorithm in the traditional image processing algorithm as the basic algorithm model. The detection measures are taken to satisfy the accurate detection of the lane line ahead. In the detection, the OpenCV open source image processing library is used to implement the above method. This method can greatly reduce the external interference to the detection of the front lane line. Using this method in the automobile test field, the lane line in front of the vehicle can be detected more accurately, and the algorithm can achieve real-time lanes on general machines. Line detection. However, during the experiment, it was also found that when there were more obstacles in the front, the algorithm used could not detect the lane line well, and the anti-interference ability to the outside world was relatively poor. References | Related Articles | Metrics

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A Review of Vehicle Target Detection Algorithms Based on Deep Learning YANG Wei 2022, 47(2): 24-26.  DOI: 10.16638/j.cnki.1671-7988.2022.002.006 Abstract ( )   PDF (1274KB) ( )   Vehicle target detection is an important part of automatic driving environment perception. In recent years, with the great breakthrough of deep learning in the field of target recognition, vehicle target detection algorithm based on deep learning has gradually become a research hotspot in this field. This paper briefly introduces the current mainstream two-stage vehicle target detection algorithm and single-stage vehicle target detection algorithm, analyzes the advantages and disadvan- tages of several representative convolution neural network algorithms, and finally summarizes the existing problems and future development direction of vehicle target detection. References | Related Articles | Metrics

Design and Research

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Optimization and Analysis of Sealing Performance in the Area of Roof Panel for the Off-road Vehicle ZHAO Bowen 2022, 47(2): 27-32.  DOI: 10.16638/j.cnki.1671-7988.2022.002.007 Abstract ( )   PDF (6662KB) ( )   Among the process of automobile R&D and manufacturing, the issues of water sealing system is always complex and confused. There is not effective solution to this problem and sealing mechanism is still unclear. Based on the way of flow paths analysis, the route of leak water, body structure and water tightness of parts are widely studied. Furthermore, the relative importance of the three design parameters is investigated using design of experiment (DOE) method for each response. Here, by optimization of the size and hardness of the rubber seals, the rain test rate has much improved from 62.5% to 99.3%. References | Related Articles | Metrics

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Design and Verification of Four-wheel Centralized Steering Mechanism for a Micro Automobile WANG Yong 2022, 47(2): 33-36.  DOI: 10.16638/j.cnki.1671-7988.2022.002.008 Abstract ( )   PDF (3109KB) ( )   In some specific occasions, such as platform, wharf and other operations, due to the narrow space, need to use to turn radius small, flexible steering micro automobile. Aiming at this type of vehicle, a new type of micro four-wheel concentrated steering mechanism is designed. The kinematics simulation analysis of the steering mechanism is carried out by DMU motion mechanism module of CATIA software. The simulation results show that the designed steering mechanism meets the steering requirements of the micro automobile. The steering mechanism was applied to a real vehicle for experimental verification, and the test results show that the steering mechanism can complete the steering function well. References | Related Articles | Metrics

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Design and Simulation of FSEC Racing Pre-charging Circuit XIE Zhaokang 2022, 47(2): 37-40.  DOI: 10.16638/j.cnki.1671-7988.2022.002.009 Abstract ( )   PDF (1739KB) ( )   In order to ensure the fairness and safety of the FSEC event, the competition has formulated strict regulations. Among them, the safety circuit is the most important link to ensure the safety of the racing electrical system. A pre-charging circuit is installed in the high voltage part of the vehicle to effectively relieve the high voltage on the racing car. The huge pressure rise generated in the process ensures the electrical safety of the power battery and the entire vehicle. According to the basic theoretical knowledge of the circuit, the specific parameters of the pre-charge resistance and the pre-charge relay are calculated, and the Simulink software is used to simulate the high-voltage power-on process of the racing car. The layout of the pre-charge circuit is designed and the pre-charge circuit is set and the pre-charge circuit is not set. The difference in the high-pressure process verifies the design effect. In the end, the design results were applied to real vehicles, showing good accuracy and robustness. References | Related Articles | Metrics

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Loudness-based Sound Quality Evaluation of Vehicle SUN Dengke 2022, 47(2): 41-44.  DOI: 10.16638/j.cnki.1671-7988.2022.002.010 Abstract ( )   PDF (1702KB) ( )   With more and more in-depth research on the evaluation of vehicle interior noise, it is found that the traditional evaluation of interior noise using only A-weighted sound pressure level has many shortcomings and cannot reflect people's subjective perception of noise. The article investigates the physiological basis of the human ear and psychoacoustics, and introduces loudness as an objective psychoacoustic parameter for the evaluation of interior noise. The loudness calculation method was studied, and the Zwicker loudness calculation model was established and implemented in Matlab. The results were compared with those calculated by Head Artemis software, and the errors were very small, which proved the correctness of the procedure. References | Related Articles | Metrics

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Structural Design and Optimization of Aluminum Alloy Shock Absorber Tower Based on Dimensional Accuracy KAN Honggui 2022, 47(2): 45-48.  DOI: 10.16638/j.cnki.1671-7988.2022.002.011 Abstract ( )   PDF (3550KB) ( )   As a kind of high quality lightweight material, aluminum alloy is used more and more widely in lightweight car body. In order to ensure the function and performance of aluminum alloy parts, in the early stage of design, designers need to analyze and optimize the precision of the components. In this paper, based on a die-casting aluminum alloy shock absorber tower components, firstly, the precision of the aluminum alloy parts is analyzed and the two key factors that affect the precision of the aluminum alloy parts are identified, and then the two key factors are optimized respectively, in order to increase the stiffness and anti-deformation capacity of the shock absorber tower, one is to increase the supporting block structure of the Heat treatment fixture, and to increase the anti-deformation capacity through the external force support. The results show that the stiffness, strength and dimensional accuracy of the shock absorber tower can be effectively improved by proper arrangement of stiffeners, and the special support fixture should be designed to ensure the support of all important mounting surfaces, avoid aluminum shock absorber tower part of the cantilever, through external support to prevent deformation. References | Related Articles | Metrics

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The Improvement of Parking Cable Bracket' Fracture LI Hang 2022, 47(2): 49-52.  DOI: 10.16638/j.cnki.1671-7988.2022.002.012 Abstract ( )   PDF (3895KB) ( )   During the durability test of vehicle in Yancheng test site, the quality problem of parking cable fixed bracket fracture occurred. The fault mileage is 1 200 km. At the same time, the same fault occurs in the alpine test. Based on the fault, this paper analyzes the working principle of the parking cable and its running state in the vehicle environment, and puts forward a variety of improvement schemes. Through the trial production, loading and road durability test of the improved parts, it is verified that the improvement scheme is feasible, the fault is effectively solved, the hidden danger is not output to the market, the possible complaints of vehicles in the market are avoided, and it also has a good design reference for the prevention of similar fault modes. References | Related Articles | Metrics

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Lightweight Design of the Commercial Power Battery Bracket QIAO Pengcheng 2022, 47(2): 53-56.  DOI: 10.16638/j.cnki.1671-7988.2022.002.013 Abstract ( )   PDF (3526KB) ( )   Using 3D software modeling and ANSYS Workbench finite element analysis, from the material selection, structure optimization two aspects of the commercial power battery bracket lightweight research, according to the results of the finite element analysis of the structure topology optimization, the final choice of glass fiber reinforced polypropylene composite material, using an integral, central position set transverse frame structure, compared with the original metal bracket weight reduction of 27%. Using Moldflow, through filling analysis, warpage analysis and so on, the better process parameters can be adjusted to provide the optimized process parameters for the needs of injection products. References | Related Articles | Metrics

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Modal Analysis and Research of BIW Based on Aluminum Alloy Shock Absorber Tower TANG Chengguang 2022, 47(2): 57-60.  DOI: 10.16638/j.cnki.1671-7988.2022.002.014 Abstract ( )   PDF (2581KB) ( )   In order to ensure that the modal performance of BIW meets the requirements in the design stage, it is necessary to analyze and study BIW modal in the early stage of design. Firstly, the modal of a steel-aluminum hybrid BIW design model equipped with aluminum alloy shock absorber tower is simulated and analyzed by finite element analysis software, and then the modal of the real vehicle is analyzed and confirmed by test method. The two methods complement each other and provide effective data support for later product optimization. The results show that the accuracy of finite element analysis results is high (the results of finite element analysis are basically the same as the test results, and the error is about 2%). The powerful simulation and calculation ability of finite element analysis software simplifies a large number of tedious engineering problems, which can save a lot of development time and cost. At the same time, the results of finite element analysis are checked and corrected by test. The combination of the two methods can provide an effective solution for the design and optimization of automobile design scheme. References | Related Articles | Metrics

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Overview of a Mechanical Four Wheel Steering System CHENG Xiuzheng 2022, 47(2): 61-64.  DOI: 10.16638/j.cnki.1671-7988.2022.002.015 Abstract ( )   PDF (1422KB) ( )   The existing four wheel steering device is complex in structure and high in cost, so it is not suitable for use on a light and affordable public vehicle. This paper presents a mechanical four wheel steering system based on flyweight centrifugal device. The system uses flyweight to sense the speed of the vehicle, and realizes the reverse deflection of the front and rear wheels at low speed to reduce the steering radius of the vehicle. At medium speed, the rear wheels do not assist in steering, while at high speed, the front and rear wheels deflect in the same direction, so as to improve the driving stability. At different speeds, the rear wheel assists steering range changes gradually and is continuously variable, which makes the vehicle with this system more flexible and stable when used in increasingly complex traffic conditions. Through the simulation verification of the system, the expected calculation results are obtained. References | Related Articles | Metrics

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Optimal Design of Response Time of Pneumatic Braking System GAO Wenjie 2022, 47(2): 65-68.  DOI: 10.16638/j.cnki.1671-7988.2022.002.016 Abstract ( )   PDF (2843KB) ( )   With the development of commercial vehicles, consumers are increasingly demanding vehicle safety. Braking response time is an important indicator for evaluating the performance of pneumatic braking systems, and it is of great significance to study solutions to shorten the braking response time. The test shows that by optimizing the selection and layout of the pneumatic braking system, the braking response time can be effectively improved, the braking distance can be shortened, and the safety of the entire vehicle can be improved. The article analyzes the pipeline layout and optimization of the pneumatic brake system, and combines the test data to demonstrate the factors that affect the braking response time, and solidify some optimization schemes. References | Related Articles | Metrics

Testing and Experiment

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Research on Path Tracking of Adaptive Model Predictive Control Based on Front Wheel Angle Constraint LI Chulin 2022, 47(2): 69-75.  DOI: 10.16638/j.cnki.1671-7988.2022.002.017 Abstract ( )   PDF (2893KB) ( )   In order to solve the problem that the smaller front wheel angle can not make full use of the road adhesion capacity and the larger front wheel angle makes the vehicle poor driving stability, an adaptive model prediction method with front wheel angle constraint is proposed. Firstly, the dynamic model of the vehicle is established, and then the longitudinal force of the tire is calculated, and finally the front wheel angle of the vehicle is obtained. The adaptive constraints of the state quantity of the vehicle and the front wheel angle are input to the model predictive controller, and the front wheel angle of the vehicle is output to realize the tracking of the reference path. The simulation results show that the vehicle with front wheel angle constraint adaptive model predictive control has better tracking ability and stability than the vehicle with fixed angle constraint on the platform of Carsim and MATLAB. References | Related Articles | Metrics

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Mesh Treatment of the Transition Zone about B-pillar Used Tailor Rolled Blank under Side Impact HU Xianlei 2022, 47(2): 76-81.  DOI: 10.16638/j.cnki.1671-7988.2022.002.018 Abstract ( )   PDF (2164KB) ( )   The B-pillar is an important safety part for side impact of automobiles. The B-pillars used tailor rolled blank (TRB) are currently more and more widely used in automobiles. The number, position and length of the transition zone affect the performance of side impact. Based on the traditional grid processing technology of the transition zone, it is extremely complicated to change the parameters of the transition zone. On the basis of the original method, the middle part of the B-pillar is drawn into many horizontal strip grids, and the parameters of the transition zone can be modified only by assigning different thicknesses to the horizontal grids, which greatly simplifies the pre-processing process. The side impact condition is established by taking the main structural parts of a body-in-white side wall as a model. The comparison shows that the two methods have similar side impact performance of B-pillar. Based on the improved method, a series of side impact tests with different parameters in the transition zone were done, and the side impact performance of each parameter was compared and analyzed. References | Related Articles | Metrics

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Study on the Influence of Car Flat Tire on Motion State ZHOU Peng 2022, 47(2): 82-86.  DOI: 10.16638/j.cnki.1671-7988.2022.002.019 Abstract ( )   PDF (2479KB) ( )   Flat tire is an extremely dangerous condition, and it is difficult to accurately express the mechanical properties of tire with tire explosion through mathematical formula, so it is difficult to conduct experimental research. In this paper, the 205/45 R17 tire in Carsim software is taken as the carrier, and the flat tire model is established by modifying the tire parameters. Through the simulation calculation, the car body will deviate from the expected road when the tire blows out, and the longitudinal force and lateral force of the tire change dramatically. The longitudinal force of the tire most affected by the falt tire will increase 3.5 times, and the lateral force will increase 10.5 times, the simulation results provide a basis for the stability control of the vehicle with flat tire. References | Related Articles | Metrics

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Numerical Analysis of High Pressure Forming in Three-way Pipe LIU Bangxiong 2022, 47(2): 87-90.  DOI: 10.16638/j.cnki.1671-7988.2022.002.020 Abstract ( )   PDF (2629KB) ( )   In this paper, the three-way pipe is taken as the research object, and the numerical analysis of internal high pressure forming is carried out with the help of nonlinear finite element DYNAFORM. The results show that under the condition of linear axial feed, the forming quality is better, the wall thickness at the branch pipe is thinner, and the thinning rate is larger, but it does not exceed the allowable range, which can provide a useful reference for the forming research of three-way pipe. References | Related Articles | Metrics

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Research on the Influence of Opening Size of Auto Parts on Torque Attenuation CHEN Jian 2022, 47(2): 91-95.  DOI: 10.16638/j.cnki.1671-7988.2022.002.021 Abstract ( )   PDF (2098KB) ( )   The influence of opening clearance of common fastening structure on torque attenuation of automobile chassis is studied. The mechanism of opening clearance and stiffness of opening structure on torque attenuation is analyzed by CAE technology.Adams is used to solve the maximum stress condition of swing arm and subframe open-end connection structure of a vehicle, and to analyze whether the maximum stress condition open-end structure will produce abnormal sound due to bushing slip due to insufficient bolt clamping force in the case of open-end clearance, which provides a verification idea for torque setting of open-end structure. References | Related Articles | Metrics

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Research on DPF Regeneration Emission Characteristics of China Six-stage Heavy-duty Diesel Vehicle GAO Zhongming 2022, 47(2): 96-101.  DOI: 10.16638/j.cnki.1671-7988.2022.002.022 Abstract ( )   PDF (1931KB) ( )   Based on the real driving emission test data of a lot of CHINA six-stage heavy-duty diesel vehicles, this paper selects four prototype vehicles that had undergone active DPF(diesel engine particulate trap) regeneration during the test. After the DPF active regeneration of the prototype vehicles was completed, the real driving emission tests under normal condition were performed. Comparing the emission test data of the prototype DPF active regeneration with the normal state, the results showed that compared with the normal state, when the prototype DPF actively regenerated, the NOX and PN did not meet the requirement of the CHINA Six-stage emission regulation, and the NOX increased by 5.8-29.4 times; PN increased by 14.0-7148.9 times; CO did not have a consistent change trend; CO2 increased by 6.3-24.2%; fuel consumption increased by 16.2-32.8%; dynamic performance remained unchanged. References | Related Articles | Metrics

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High Temperature (Dry Heat) Test Research on a Domestic Military Off-road vehicle LIU Ce 2022, 47(2): 102-106.  DOI: 10.16638/j.cnki.1671-7988.2022.002.023 Abstract ( )   PDF (2070KB) ( )   In order to test the adaptability of a domestic military off-road vehicle in high temperature (dry heat) area. Thermal balance capacity test, ventilation and heat insulation capacity test, air-conditioning refrigeration system performances test, self rescue and mutual rescue test, and adaptive driving test were carried out in Turpan area. The maximum allowable ambient temperature of the sample vehicle is 46.2 ℃; the thermal insulation performance is good but the ventilation performance is relatively sultry; the temperature difference between the shoulder of the rear passengers and the outside of the vehicle is 8.2 ℃ after 20 minutes of refrigeration at 41.5 ℃; self rescue and mutual rescue can be realized on the desert ground; no fatal fault and serious fault in the 3 000 km adaptive driving test. The test process was described and the test results were analyzed to provide basis for the design and finalization of the vehicle type, and the vehicle was classified according to the test process and product characteristics The high temperature test of similar automobile enterprises provides technical reference and reasonable suggestions. References | Related Articles | Metrics

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Discuss about Shock Absorber Tuning and Test Methods for a Vehicle Model FAN Hongchun 2022, 47(2): 107-110.  DOI: 10.16638/j.cnki.1671-7988.2022.002.024 Abstract ( )   PDF (2562KB) ( )   In the research and development process of automobile chassis, the performance of shock absorber has a very important influence on the vehicle comfort and ride comfort. In order to understand how to obtain the vibration velocity of shock absorber through the collection of road test data, so that the debugging of shock absorber can get an effective direction, so as to better master the debugging method of shock absorber, the shock absorber debugging of a domestic model is studied as an example, and based on MATLAB/GUI, a graphical user interface tool is developed for the selection of shock absorber throttle plate. Users can more quickly and efficiently select throttle plate, improve work efficiency, but also provides a new reference method for shock absorber debugging. References | Related Articles | Metrics

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Influence of Injection Pressure on Fuel Flow in Diesel Injector Nozzles CHENG Linyuan 2022, 47(2): 111-114.  DOI: 10.16638/j.cnki.1671-7988.2022.002.025 Abstract ( )   PDF (2180KB) ( )   Injector nozzle is one of the most important working parts of diesel engine, its performance direct ly affects the combustion process and discharge performance of diesel engine, so it is very necessary to study the injection characteristics of diesel fuel and fuel spray characteristics in the nozzle. But the internal space of the nozzle is very narrow, but there is a very high fuel flow speed and injection pressure, it is very difficult to test it. Gambit software was used for the geometric modeling of the nozzle, and then the reasonable mesh division was car ried out. Finally, the geometric model was imported into Fluent software. By changing the injection pressure, the flow velocity and pressure distribution of the fuel in the nozzle are simulated, and the results show that increasing the injection pressure increases the flow velocity of the fuel in the nozzle. References | Related Articles | Metrics

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Research on Stability of Active Four Wheel Steering Vehicle Based on Model Predictive Control ZHANG Haichuan 2022, 47(2): 115-118.  DOI: 10.16638/j.cnki.1671-7988.2022.002.026 Abstract ( )   PDF (1312KB) ( )   In order to improve the handling stability of the vehicle on the high-speed and low adhesion road, this paper designs a model predictive controller to track the linear two degree of freedom ideal model, obtains the yaw rate and sideslip angle deviation, and then calculates the actual four wheel angles by quadratic programming algorithm. Establishing the open-loop angle step condition in Carsim software, this paper verifies the effectiveness of the algorithm. The results show that: compared with the front wheel steering, the active four-wheel steering vehicle based on model predictive control designed in this paper can effectively reduce the yaw rate and mass center side slip angle under the vehicle angle step input, and better track the ideal control target. The active four-wheel steering vehicle improves the vehicle handling stability and path tracking accuracy. References | Related Articles | Metrics

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Discuss the Influence of Hub Structure on Wheel Strength LI Fei 2022, 47(2): 119-122.  DOI: 10.16638/j.cnki.1671-7988.2022.002.027 Abstract ( )   PDF (2866KB) ( )   Wheel is the safety part of the car, not only affects the performance of the car, but also affects the safety of the car, should have enough stiffness and fatigue strength. The strength of the wheel is not only related to the tire pressure, vehicle weight, maximum tire load, vehicle speed, service temperature and corrosion, but also affected by the structure of the hub connected with the parts. In this paper, the influence of different hub structure on wheel strength is analyzed and verified, and the safety rate and service life of wheel can be improved by optimizing hub structure, which provides a new idea for solving the problem of wheel cracking and wheel lightweight design. References | Related Articles | Metrics

Process and Equipment

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Application of Semi-automatic Assist Arm in Automobile Assembly Line LI Shujian 2022, 47(2): 123-127.  DOI: 10.16638/j.cnki.1671-7988.2022.002.028 Abstract ( )   PDF (3720KB) ( )   As the key process of automobile manufacturing, automobile assembly line has many operators and great labor intensity. As the technological equipment to reduce the working intensity of employees, assist arm has been widely used. With the popularization of intelligent manufacturing, automobile manufacturing has gradually turned to automation and semi-automation. By analyzing the characteristics of the assist arm in the assembly plant, and taking the sunroof as an example, this paper solves the difficulties encountered in the process of positioning, taking materials and entering the car body, and successfully develops the semi-automatic sunroof assist arm, then to reduce labor intensity, personnel input and manufacturing cost. Furthermore, the prospect of popularization and application of semiautomatic assist arm is put forward to prepare for the important step of reducing labor intensity and intelligent manufacturing. References | Related Articles | Metrics

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Research on Control Method of Welding Defects of Galvanized Sheet Robot YU Qian 2022, 47(2): 128-131.  DOI: 10.16638/j.cnki.1671-7988.2022.002.029 Abstract ( )   PDF (1180KB) ( )   In order to reduce the number of welding defects and repair of unqualified products and reduce the production cost, this paper studies the optimization method of welding process of thin galvanized sheet, and analyzes the causes of welding seam burn through, edge bite, porosity, arc pit and other deformation defects in robot welding of galvanized sheet. Puts forward the optimized welding procedure, parts assembled clearance, drop transfer mode, position welding, welding speed and welding posture, ship type choose backward of welding methods, prevention measures, such as reverse deformation effectively control results show that the welding defects, weld a qualified rate of 95% or more, greatly reduces the cost of repair, is of great significance. References | Related Articles | Metrics

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Application Research of Cold-worked Steel 7Cr5Mo2MnVSi in Shield Machine Hob SU Wei 2022, 47(2): 132-135.  DOI: 10.16638/j.cnki.1671-7988.2022.002.030 Abstract ( )   PDF (1368KB) ( )   This paper introduces the engineering application test of two different German and Swedish brands of steel on the Shield hob. The results show that the Swedish material 7Cr5Mo2MnVSi (coldworked steel) shows excellent wear resistance and breaks through the engineering practice of hot steel for the blade ring of the shield machine. It is one of the ideal materials for making hard rock cutter ring. Of course, the excellent mechanical properties of cold-worked steel 7Cr5Mo2MnVSi are closely related to its material composition, processing process and heat treatment process. The paper describes in detail the unique heat treatment process and processing process of Swedish material 7Cr5Mo2MnVSi. It provides reference and reference for China's manufacturing of hob ring. References | Related Articles | Metrics

Automobile Education

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Research and Practice on Teaching Cases of Automobile Detection and Diagnosis Technology BAO Erkai 2022, 47(2): 136-139.  DOI: 10.16638/j.cnki.1671-7988.2022.002.031 Abstract ( )   PDF (1435KB) ( )   The application of case teaching method can enhance teachers' professional level and ability, stimulate students' interest in learning, and improve teaching effect. The course of Automobile Detection and Diagnosis Technology (ADDT) has the characteristics of comprehensiveness and practicality. Taking the course of ADDT of automobile service engineering in an application-oriented undergraduate college as an example, this paper mainly studies the construction of teaching cases, application process of case teaching method, and analyzes the teaching effect and the existing problems in the course of case teaching. Research and practice show that establishing a good case base and constantly updating and refining the case content has a better teaching effect, which has a certain reference significance for the teaching of engineering practical courses. References | Related Articles | Metrics

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Research on 3D Vertigo of Virtual Simulation Teaching System for Automobile Specialty LIU Shufeng 2022, 47(2): 140-143.  DOI: 10.16638/j.cnki.1671-7988.2022.002.032 Abstract ( )   PDF (1060KB) ( )   Virtual reality technology is constantly promoted and applied in professional teaching. Compared with the traditional teaching mode of automobile specialty, virtual simulation teaching mode has the advantages of intuitive structure, strengthening practical effect and reducing training cost. However, in the process of teaching application, it is found that virtual reality technology will cause students to have more serious 3D vertigo, which greatly affects the teaching effect and promotion use. This paper analyzes the causes of 3D vertigo combined with the teaching practice and the characteristics of automobile professional courses, and provides a reference for the design and production of virtual simulation system and the promotion of teaching mode. References | Related Articles | Metrics

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Position of "4341" Talents in Post-Market Technology Field of Automotive Service Engineering DENG Zhaowen 2022, 47(2): 144-147.  DOI: 10.16638/j.cnki.1671-7988.2022.002.033 Abstract ( )   PDF (1338KB) ( )   Based on the research of enterprises and universities, in order to meet the needs of industry and social development, the orientation talent cultivation of automobile service engineering professionals in our school was connected with the post-sales service post of automobile production enterprises. According to the pyramid structure characteristics of automobile service talents, the orientation talent cultivation mode "4341" in the field of automobile post-market technology was preliminarily established, and according to the cultivation of thought of "thick foundation, wide specialization and moderate, paying attention to application and strengthening ability", combining with the characteristics of professional construction in domestic colleges and universities, the core competitiveness of "knowing technology, managing and serving well" was strengthened. The orientation talent cultivation mode "4341" in the automobile service engineering suitable for the development of our school was determined through the continuous optimization and summaries, and the effect of talent training is obvious. References | Related Articles | Metrics

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Teaching Reform and Practice of Automobile Insurance and Claims Course Based on Post Ability Demand Orientation LI Hua 2022, 47(2): 148-151.  DOI: 10.16638/j.cnki.1671-7988.2022.002.034 Abstract ( )   PDF (2259KB) ( )   Based on to the idea of education and the basic task of khalid ents, auto insurance and claims course team by questionnaire, field visits and other forms of industry, enterprise research, combined with the research situation and the characteristics of the course, based on post ability demand, docking professional standards, focusing on the new automobile insurance, from the reconstruction of the course content, teaching mode and evaluation of curriculum innovation design. Forming the professional curriculum design ideas with popularization significance can effectively improve teachers' ability of curriculum design. The teaching team used the reformed curriculum to win the first prize in the provincial teaching competence competition. References | Related Articles | Metrics

Standards Regulations Management

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The Automotive Industry Process Change Platform Management Strategy ZHAO Ling 2022, 47(2): 152-155.  DOI: 10.16638/j.cnki.1671-7988.2022.002.035 Abstract ( )   PDF (1241KB) ( )   After entering the 21st century, China's auto sales soar, the growing demand for automobiles, the traditional "one-on-one" single product factory production mode have been unable to meet the production requirements, in order to solve the "N" pair of plant production model, we applied the concentration change of system IT, make sure that all the change set review can be stepped on the implementation of flexible process and solve process change multiple synchronous factory production and management difficulties, retrofit scheme promote implementation of standardization, guarantee the unification of the technological standards and specifications. Through the application of the process change system and the establishment of a new system, it has realized the management of the whole life cycle of process change, and become the leader of the industry process change platform management. References | Related Articles | Metrics

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Introduction to the Test of Active Safety Project for Standard Models of Road Transport Vehicles DENG Guokai 2022, 47(2): 156-159.  DOI: 10.16638/j.cnki.1671-7988.2022.002.036 Abstract ( )   PDF (1028KB) ( )   The implementation of standard models of road transport vehicles has effectively improved the safety performance of road transport vehicles. This paper mainly introduces the corresponding standards for the standard models of road transport vehicles from the following four vehicle active safety test items: electronic stability control system, lane departure warning system, forward collision warning system and automatic emergency braking system, it provides a reference for the test of active safety vehicle project for the relevant practitioners of road transport vehicles. References | Related Articles | Metrics

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Study on the Total Mass Limit of Heavy Pure Electric Commercial Vehicle ZHANG Chunhu 2022, 47(2): 160-163.  DOI: 10.16638/j.cnki.1671-7988.2022.002.037 Abstract ( )   PDF (378KB) ( )   On July 26, 2016, Outline dimensions, axle loads and mass limits of automobiles, trailers and motor vehicles (GB 1589) was released for implementation. The standard stipulates the outline dimensions and mass limits of automobiles, trailers and motor vehicles, applicable to all vehicles on the road, is the automotive industry one of the most basic technical standards. This paper discusses the support of the national strategy for new energy vehicles, and illustrates with examples the requirements of the technical review specification (automobile part) of the Bulletin of vehicle products for the regulation of the on-board quality utilization coefficient of pure electric commercial vehicles, in order to analyze the restriction of the maximum allowable total mass limit of 4.3 in GB 1589 to the heavy-duty pure electric commercial vehicle, and put forward some reasonable suggestions, the total mass and axle load limit of heavy-duty pure electric commercial vehicle should be adjusted to promote the high quality development of new energy vehicle. References | Related Articles | Metrics

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Talk about the Development Trend of Automobile After-sales Technical Support XIONG Yingyong 2022, 47(2): 164-166.  DOI: 10.16638/j.cnki.1671-7988.2022.002.038 Abstract ( )   PDF (1847KB) ( )   The car have gradually become an indispensable walking tool in daily life. With the acceleration of people's life and the increase of the frequency of automobile use, the timeliness and effectiveness requirements for car maintenance are also improving. In the process of actual market service, the service store cannot solve all car failures, and after-sales technical support personnel are needed to help complete fault diagnosis and maintenance. This paper analyzes the development trend of after-sales technical support for automobile after-sales technical support. References | Related Articles | Metrics

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Discussion on Perceived Quality Evaluation of Automobile Interior SUN Weiming 2022, 47(2): 167-169.  DOI: 10.16638/j.cnki.1671-7988.2022.002.039 Abstract ( )   PDF (1713KB) ( )   The perceived quality of automobile plays a very important role in the process of customers' purchase. It has subjectivity and timeliness, so it brings some difficulties to the research work. In this paper, through years of research on the perceived quality of automotive interior, starting from the user's functional needs of automotive interior, combined with actual cases, the correlation between functional category and perceived quality is studied, and the evaluation contents and methods of automotive interior are explored, so as to provide reference for the evaluation and design of automotive interior perceived quality. References | Related Articles | Metrics

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Overview of New Energy Vehicle Motor Driver DC Link Capacitors ZHANG Lu 2022, 47(2): 170-172.  DOI: 10.16638/j.cnki.1671-7988.2022.002.040 Abstract ( )   PDF (1029KB) ( )   The DC link capacitor is one of the key components of the new energy vehicle motor driver, and its reliability will affect the reliability and safety of the entire electric drive system. Condition monitoring is one of the commonly used methods to assess the health status of bus capacitors, which can detect the signs of degradation or fault characteristics of bus capacitors in time to avoid failures. The article first introduces the basic characteristics of aluminum electrolytic capacitors, and then classifies the current state monitoring methods of capacitors. It is divided into capacitor ripple current sensor method, circuit model method and intelligent monitoring method. The principle of each method is introduced and compared. The advantages and disadvantages of various methods are analyzed, which provides a research direction for subsequent capacitor state monitoring. References | Related Articles | Metrics