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15 February 2022, Volume 47 Issue 4 Previous 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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Layout Analysis of Range Extender for Methanol Fuel Cell Based on Thermal Management ZHOU Yafu 2022, 47(4): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2022.004.001 Abstract ( )   PDF (4104KB) ( )   Due to the limitations of pure electric vehicle power storage batteries, fuel cells have become a research hotspot for electric vehicle range extenders with their high efficiency, pollution-free, and high reliability. This paper takes a pure electric vehicle on the market as the research object, arranges the methanol fuel cell range extender in the front compartment of the vehicle, and simulates the temperature distribution of the three-dimensional model of the fuel cell range extender at different vehicle speeds. The simulation results show that when the vehicle is stationary, the methanol fuel cell working at the rated power will affect the normal operation of the front compartment components; when the vehicle is driving at a speed of more than 30 km/h, the influence of the fuel cell range extender on the front compartment components can be ignored. The test results verify the reliability of the simulation results. It has certain reference value for the layout of the fuel cell range extender of the actual vehicle and the formulation of the control strategy. References | Related Articles | Metrics

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Research on the Influence of Electric Wheels in Four-wheel Independent Drive Electric Vehicles LIANG Hailin 2022, 47(4): 7-10.  DOI: 10.16638/j.cnki.1671-7988.2022.004.002 Abstract ( )   PDF (1534KB) ( )   In order to analyze the negative effects of vertical vibration caused by the increase in the mass of unsuspended springs of electric vehicles driven by hub motors, according to the self-developed four-wheel independently-driven hub motor electric vehicle, the 1/4 dynamics of the centralized motor and the in-wheel motor-driven vehicle are established, under the same road input, compare and analyze the car ride comfort evaluation index, and illustrates the influence of the electric wheel structure on the vertical performance of the vehicle driven by the in-wheel motor. The results show that the body vertical acceleration and tire dynamic load of the in-wheel electric vehicle have increased, and this change will cause a certain degree of deterioration in the driving comfort of the vehicle. References | Related Articles | Metrics

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Research on Range-extended Electric Vehicle in Chinese Market WANG Jinyan 2022, 47(4): 11-14.  DOI: 10.16638/j.cnki.1671-7988.2022.004.003 Abstract ( )   PDF (2093KB) ( )   The development of new energy vehicles is the only way for China to move from a big automobile country to an automobile country, and it is a strategic measure to cope with climate change and promote green development. Thickening of electric vehicles, as a kind of series hybrid, the engine on the vehicle is not direct drive vehicles, only driven vehicle is powered by a generator, compared with traditional vehicles and other hybrid vehicles engine working point and vehicle control strategy is more simple, relying on this feature, increase program electric cars in the stage of new energy. This paper lists several typical extend-range electric vehicles in the Chinese market, and analyzes their working mode, performance parameters and market performance in detail, so as to predict the future development of extend-range electric vehicles in the Chinese market. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on Road Terrain Recognition Based on Improved LBP Operator YUAN Shilong 2022, 47(4): 15-18.  DOI: 10.16638/j.cnki.1671-7988.2022.004.004 Abstract ( )   PDF (2310KB) ( )   Different pavement types will have diverse impacts on vehicle braking, acceleration, lane change and other decisions. It is of great significance to obtain pavement type information in time for improving the safety and comfort of intelligent vehicles. A road terrain recognition method based on LBP operator is proposed. Firstly, this paper collects the image information of four common road surfaces, and augments the images. LBP operator is used to extract the texture features of the pavement image, and PCA is used to reduce the dimension of the texture features. Finally, the classifier is used to train and classify the data. Experimental results show that the highest classification accuracy of this method can reach 98.5%, which effectively improves the accuracy of current pavement type recognition. References | Related Articles | Metrics

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Experimental Study on Recognition Accuracy of Infrared Image in Driverless Technologies ZHANG Zhen 2022, 47(4): 19-23.  DOI: 10.16638/j.cnki.1671-7988.2022.004.005 Abstract ( )   PDF (4570KB) ( )   Improving the security of driverless cars, enriching the applicable environment of unmanned driving and further the degree of automatic driving system are important research contents in this article. This paper starts from the selection of vehicle infrared imaging auxiliary equipment that act better performance among different wavelengths, and based on its availability in the complex environment, gives the conclusion that short wave infrared imaging equipment performed best. Meanwhile, aiming to improve the infrared image quality, this paper has completed some trail tests to optimize the quality of a certain picture, which are based on some image enhancement algorithms by MATLAB. References | Related Articles | Metrics

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Application of Data Analysis of Internet of Vehicles Based on Data Dimension Reduction and Clustering YAO Liucheng 2022, 47(4): 24-28.  DOI: 10.16638/j.cnki.1671-7988.2022.004.006 Abstract ( )   PDF (1796KB) ( )   The data analysis and application of Internet of vehicles under the background of intelligent network has an important impact on improving traffic intelligence. In order to speed up the process of traffic intelligent, data redundancy in the data application of Internet of vehicles is studied. The data collected from the Internet of vehicles is taken as the research object, and the classification and identification of driving behavior characteristics is taken as the research object. Correlation analysis and principal component analysis were used for redundancy screening and dimensionality reduction of data, and k-means clustering algorithm was used for classification and identification of driving behavior characteristics. The results show that the data dimension reduction method can reduce the correlation redundancy of the Internet of vehicles data, and the characteristics of driving behaviors can be classified into three types of driving behaviors. The research improves the application value of the data of the Internet of vehicles, and also provides relevant support for traffic intelligence. References | Related Articles | Metrics

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Analysis of Target Detection Algorithm and Its Application in Autonomous Driving Scenarios ZHAO Huiting 2022, 47(4): 29-33.  DOI: 10.16638/j.cnki.1671-7988.2022.004.007 Abstract ( )   PDF (1030KB) ( )   The proportion of target detection algorithms based on deep learning in the field of autonomous driving is increasing. This article first introduces the development process of convolutional neural networks and target detection algorithms based on deep learning. Briefly introduce the structural characteristics of several classic convolutional neural networks. A series of two-stage algorithms based on candidate frames represented by the R-CNN series and a regression-based one-stage algorithm represented by the YOLO series are introduced in detail. Briefly introduce the respective structures, advantages and disadvantages of these two types of algorithms. Finally, several commonly used optimization methods and research trends in the application of target detection algorithms in autonomous driving scenarios are summarized. References | Related Articles | Metrics

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Safety Analysis of Vehicle Bus Communication WANG Pengcheng 2022, 47(4): 34-37.  DOI: 10.16638/j.cnki.1671-7988.2022.004.008 Abstract ( )   PDF (654KB) ( )   With the rapid development of automobile intelligence and networking, the number of electronic control units (ECUs) used in vehicles is increasing. On the basis of cost-effective control, it is ensured that different types of electronic control units can communicate effectively, and different bus protocols is applied to the vehicle. As a product with very high safety requirements, different bus protocols have their own unique characteristics. The analysis of the safety problems that may occur during the application of different buses is a necessary condition to ensure the safe development of vehicles in advance. This article briefly introduces the application of different vehicle buses, clarifies the respective characteristics of common bus types, summarizes the common problems faced by different protocol types in the application process, analyzes the occurrence of risk problems, and proposes possible risk points and proposes a brief protection measures. References | Related Articles | Metrics

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Research on Local Path Planning and Path Following Based on MPC CHANG Hong 2022, 47(4): 38-41.  DOI: 10.16638/j.cnki.1671-7988.2022.004.009 Abstract ( )   PDF (1081KB) ( )   This paper focuses on the path tracking of the unmanned vehicle, if the vehicle encounters an obstacle, a feasible path needs to be re-planned locally. Firstly, this paper use the vehicle point mass model and the MPC local path planning algorithm to obtain the vehicle dynamics constraints and Realize the local path of the obstacle avoidance function, and then track the path based on the two-degree-of-freedom vehicle dynamics model and MPC algorithm, and finally the algorithm is verified by Carsim& Simulink platform. The results show that the local path planning and path tracking algorithm can be reliable to plan a local path to avoid obstacles, and realize path tracking while at high speed. References | Related Articles | Metrics

Design and Research

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Influence Analysis of Different Winding Magnetic Steel Parameters on Performance of PMSM for Electric Vehicle Based on JMAG XUE Bin 2022, 47(4): 42-47.  DOI: 10.16638/j.cnki.1671-7988.2022.004.010 Abstract ( )   PDF (4113KB) ( )   Based on electric vehicle performance requirements of the permanent magnet synchronous motor, the motor windings in different width and length of magnetic steel, change a variable and other conditions in the same situation, with the help of electromagnetic field in the research and analysis of finite element softer JWG motor circuit current, circuit voltage and torque, winding can be gained by analyzing the change of the width and length of magnet steel's influence on the motor. The conclusion shows that the change of magnetic steel length has the greatest influence on the maximum circuit voltage and current, and the winding length has the greatest influence on the motor torque. References | Related Articles | Metrics

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Modeling and Control of Water-cooled PEMFC Thermal Management System FANG Jianping 2022, 47(4): 48-52.  DOI: 10.16638/j.cnki.1671-7988.2022.004.011 Abstract ( )   PDF (1783KB) ( )   In order to maintain the proton exchange membrane fuel cell (PEMFC) working in a reasonable temperature range, this paper firstly establishes the reactor temperature model and reactor cooling loop model of the fuel cell thermal management system, then establishes the PEMFC ontology model, and carries out the verification of the ontology model, adopts the Bang-Bang control thermal management control strategy, and carries out the off-line simulation and rapid control prototype test. The results show that the stack can be well maintained at the target temperature (70±1) ℃and the heat sink cooling water temperature (70±2) ℃ under different current load variations, which achieves the expected control effect. References | Related Articles | Metrics

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Design of Portable Engine Oil Pressure Tube Outside Detection Device NI Jin 2022, 47(4): 53-55.  DOI: 10.16638/j.cnki.1671-7988.2022.004.012 Abstract ( )   PDF (1626KB) ( )   The detection of engine fuel oil pressure is of practical significance to ensure the normal operation of automobiles. Through the portable engine oil pressure tube detection device designed in this paper, non-destructive oil pressure detection can be realized by non-direct contact with fuel. The device realizes the data acquisition, analog conversion and real-time display of the pressure in the pipe by means of mechanical conversion mechanism, pressure sensor, data acquisition and data display. The correctness of the design idea is verified by the practical measurement and application of the portable out-of-pipe testing device. References | Related Articles | Metrics

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Finite Element Analysis of Structural Strength of FSEC Racing Battery Box DU Changbo 2022, 47(4): 56-59.  DOI: 10.16638/j.cnki.1671-7988.2022.004.013 Abstract ( )   PDF (1740KB) ( )   According to the rules of FSEC racing and the demand of power system, this paper designs a kind of battery box for FSEC racing car. The finite element model of the battery box is established in CATIA. Through the analysis of the working conditions of rapid acceleration, rapid deceleration, turning and durability by using the ANSYS workbench finite element simulation software, the deformation cloud diagram, stress cloud diagram and fatigue alternating stress cloud diagram of the battery box are obtained, and the maximum stress value and the maximum deformation position are defined, which provides the direction for the follow-up structural optimization design. The research and development of simulation driver by using ANSYS software greatly improves the design efficiency and promotes the development of the competition. References | Related Articles | Metrics

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Optimization Design and Stability Analysis of Suspension of Baja Racing CHENG Jinrun 2022, 47(4): 60-63.  DOI: 10.16638/j.cnki.1671-7988.2022.004.014 Abstract ( )   PDF (2101KB) ( )   Using the basic sketch of the suspension (front, back, and side views), the plane hard points are constrained in the sketch, the basic plane structure of the suspension is arranged and the parameter values and positions of each structure are determined. The parts required for the suspension are drawn and assembled in CATIA to form a 3D rendering. Through Solidworks, parameterize the front and rear suspension models, check whether the model assembled in CATIA interferes, determine whether there is a gap at each connection point, and obtain the hard point space coordinates of the suspension from it to achieve data migration. The hard point coordinates obtained by Solid works are modeled in Adams-car, and the shape of the part is drawn to input the relevant parameters of the suspension. The movement pair and the communicator are added according to the different movement modes. Simulate the established virtual prototype to call the simulation data from the background and analyze to see if the suspension parameters fluctuate within a reasonable range during the simulation. Finally, the unreasonable data is further optimized in Adams-insight to re-export a set of hard point coordinates that meet the design goals. References | Related Articles | Metrics

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Research on Vibration Isolation Analysis Method of Heavy Truck Powertrain Mounting System HE Yabin 2022, 47(4): 64-67.  DOI: 10.16638/j.cnki.1671-7988.2022.004.015 Abstract ( )   PDF (2848KB) ( )   In order to study the vibration isolation analysis method for powertrain mounting system, a rigid flexible coupling multi-body dynamic model of a heavy truck is established. By comparing the simulation and test results of flexible frame and rigid frame vehicle model, it is found that the worst error is 8.9% and 25.1% respectively. The results show that the flexible frame vehicle model is closer to the test results and can be used to calculate the vibration isolation rate of powertrain. In order to simplify the analysis process, the three simplified methods is studied based on flexible coupling multi-body dynamic model. Compared with the test results, the maximum error of the simplified model is 12.3%, and the initial model is 5.34%. Therefore, simplified model can be used to calculate the vibration isolation rate of powertrain in the early stage of vehicle design. Meanwhile, it provides theoretical guidance for the calculation of powertrain vibration isolation rate and has important engineering application value. References | Related Articles | Metrics

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Analysis and Implementation of Dynamic Performance Improvement for Passenger Car DCT Model WANG Hongjing 2022, 47(4): 68-71.  DOI: 10.16638/j.cnki.1671-7988.2022.004.016 Abstract ( )   PDF (1932KB) ( )   In order to meet the requirements of the company's development strategy, it is necessary to create a high performance and motion control model. In order to improve the power and control of this passenger car DCT model, respectively from the start, acceleration of the vehicle in the process of torque and torque recovery, shifting the end of the shift process of alternating torque and rotational speed synchronization time, shift line acceleration and dynamic shift up shift line and optimize hardware five aspects, this paper to accelerate process of this model and shift torque control for a detailed analysis of the process. The five optimization directions were decomposed into 13 sub-items, and the optimization effect of each sub-item was analyzed respectively. The control system of the vehicle was optimized by INCA software, and the target development requirements were met after the actual road test. References | Related Articles | Metrics

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Finit Eelement Analysis and Optimization Design of an Off-road Vehicle Wheel Hub on ANSYS Workbench WANG Qianqian 2022, 47(4): 72-75.  DOI: 10.16638/j.cnki.1671-7988.2022.004.017 Abstract ( )   PDF (1904KB) ( )   The three-dimensional software Creo was used to establish a three-dimensional model of the wheel hub, and after importing into ANSYS Workbench, it was meshed to form a finite element calculation model and calculated, and the stress and deformation results under the limit working condition were obtained. According to the analysis and calculation results, the structural improvement plan is proposed and the verification calculation is carried out, which provides an important theoretical basis for the optimization design. References | Related Articles | Metrics

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Talking about the Design Scheme of Dynamic Position Lamp of Automobile Rear Combination Lamp ZHU Shengkuan 2022, 47(4): 76-78.  DOI: 10.16638/j.cnki.1671-7988.2022.004.018 Abstract ( )   PDF (1572KB) ( )   This article mainly discusses the dynamic effects of automotive rear combination lamp position light (LED light source) in application scenarios through design methods and the feasibility of automotive lamp modeling. This function includes position light source, MCU (light source controller) and BCM (body controller). The vehicle body controller and the light source controller drive the position light source under certain conditions, so that the position light source is lit in a certain program. Make the lighting effect of the rear combination lamp more fashionable and smart. I hope that the working principle and logical method of the scheme described by me will provide reference and reference for future design work. References | Related Articles | Metrics

Testing and Experiment

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Research on Height Adjustment Control Strategy of Electric Control Air Suspension Based on Fuzzy Adaptive PID XU Mingyang 2022, 47(4): 79-83.  DOI: 10.16638/j.cnki.1671-7988.2022.004.019 Abstract ( )   PDF (1360KB) ( )   The electronically controlled air suspension can adjust the body height adaptively according to the driving conditions of the bus, which can significantly improve the driving stability and fuel economy of the bus, the design of vehicle height adjustment control is of great significance. Aiming at the phenomenon of "overcharge", "overdischarge" and "oscillation" in the process of height adjustment of electric control air suspension of passenger car, the fuzzy adaptive PID control algorithm is introduced to design the control strategy of height adjustment. The specific process of height adjustment of electric control air suspension of passenger car is analyzed, and the height adjustment system including body, air tank, solenoid valve and air spring is established. Finally, the fuzzy PID control strategy design and performance simulation verification of the height adjustment of the electric control air suspension are completed. The results show that the designed control strategy can realize the accurate adjustment of the body height of the bus electronic air suspension. References | Related Articles | Metrics

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Determination of Unburned Methanol in Methanol Automobile Exhaust LI Lingyan 2022, 47(4): 84-87.  DOI: 10.16638/j.cnki.1671-7988.2022.004.020 Abstract ( )   PDF (978KB) ( )   In this paper, the method of using silica gel adsorption tube to collect methanol from automobile exhaust emissions was researched, the specifications of silica gel adsorption tubes, the concentration of samples to be tested, the sampling parameters and so on were discussed and verified in detail. The study showed that the methanol was easy to penetrate in the process of collecting methanol with silica gel adsorption tube. With the increase of silica gel particle loading, the penetration rate of methanol decreased, and the actual adsorption efficiency of methanol increased. At the same sampling flow rate, the higher the concentration of the sample to be tested, the higher the methanol penetration rate. At the same concentration of the sample to be tested, the higher the collection flow rate, the higher the methanol penetration rate. The silica gel adsorption tube in series can effectively reduce the penetration of methanol and improve the adsorption efficiency. References | Related Articles | Metrics

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Prediction of Highway Freight Traffic Volume Based on Markov-grey Model LOU Guoliang 2022, 47(4): 88-91.  DOI: 10.16638/j.cnki.1671-7988.2022.004.021 Abstract ( )   PDF (1339KB) ( )   In order to accurately predict the highway freight trend in China, combining GM (1,1) prediction model, Markov theory and metabolism, a combination forecasting model is proposed. Based on the original data series of highway cargo turnover in China from 2009 to 2016, the highway cargo turnover in China from 2017 to 2019 is predicted. The results show that the prediction accuracy of the combined model is higher than that of the traditional grey GM (1,1) model. By adding the metabolic thought, deleting the old data and introducing the new data, the error of the long-term prediction is reduced. When the grey Markov model is used for the new sequence, the relative error from the original 7.81% and 6.45% is reduced to 3.85% and 0.62%, respectively, during 2018-2019. References | Related Articles | Metrics

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Optimization and Verification of Reducing Minimum Turning Radius of a Vehicle ZHANG Daoquan 2022, 47(4): 92-95.  DOI: 10.16638/j.cnki.1671-7988.2022.004.022 Abstract ( )   PDF (2765KB) ( )   In the general trend of chassis platformization, the chassis of model year models is basically in use. But with the higher requirements for the performance of the vehicle, such as mobility, it is necessary to analyze the original platform and minimize the amount of changes, and verify the real vehicle to meet the market requirements. Based on the theoretical analysis of the influencing factors and the definition of the whole vehicle development scope, this paper finally selects the scheme of increasing the travel of the steering gear, and completes the theoretical analysis and real vehicle verification. It only costs tens of thousands of yuan to repair the model, that is, to optimize the minimum turning radius and solve the problem of market complaints. References | Related Articles | Metrics

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Rule Based Logic Threshold Control Strategy for HEV SONG Weiping 2022, 47(4): 96-99.  DOI: 10.16638/j.cnki.1671-7988.2022.004.023 Abstract ( )   PDF (1674KB) ( )   The control strategy of hybrid electric vehicle is very important not only for the performance of the vehicle, but also for the fuel consumption of the vehicle. Based on the hybrid electric bus, this paper analyzes several working modes in its operation. Then, according to the lower limit of vehicle speed, real-time vehicle speed and battery state, a rule-based logic threshold control strategy is formulated. Finally, the whole vehicle model is built in cruise, and the control strategy is embedded to complete the simulation. The results show that the control strategy developed in this paper meets the vehicle economic performance and is correct and reasonable. References | Related Articles | Metrics

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Crash Analysis Based on Lumped Mass and Spring Model HUA Rui 2022, 47(4): 100-104.  DOI: 10.16638/j.cnki.1671-7988.2022.004.024 Abstract ( )   PDF (2141KB) ( )   In this paper, based on the theory of lumped mass and spring model and the analysis of motion, the spring force-displacement curve is modified to make the two motion processes match. Software Ls-dyna was used to build lumped mass and spring model. The definition of element type, analysis case and spring material were introduced in detail, and the impact simulation analysis were completed.The results show that the variation of displacement, velocity and acceleration of lumped mass and spring model is consistent with that of vehicle model, which indicates that lumped mass and spring model is feasible to be used in the crash path planning during vehicle pre-study stage. References | Related Articles | Metrics

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Optimization of Noise in Idling Air-conditioned Vehicle ZHAO Junhua 2022, 47(4): 105-108.  DOI: 10.16638/j.cnki.1671-7988.2022.004.025 Abstract ( )   PDF (5254KB) ( )   The people have a higher requirement for automobile comfort, as the improvement of people's living standards. As one of the important components of the vehicle, the automobile manufacturer has also a higher requirement to the exhaust system NVH performance. Idle noise and vibration is an important factor of influencing noise, vibration, ride comfort level and comport of the vehicle. Taking a certain car as an example, the inside source and transfer path is analyzed. The main reason led to the problem is determined, and the relevant optimizing solution is put forward. The verification is indicated that the inside roar is eliminated, noise and vibration is reduced obviously. Effect is better and it provides method and solution for the same problems in the future. References | Related Articles | Metrics

Process and Equipment

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Based on PFMEA Analysis Method to Solve the Problem of Matching the Rear Door and Side Wall Surface Difference of a Certain Car Model MENG Fangang 2022, 47(4): 109-113.  DOI: 10.16638/j.cnki.1671-7988.2022.004.026 Abstract ( )   PDF (4080KB) ( )   With the rapid development of the automobile industry, customers not only have requirements for automobile performance, but also on the sensory quality of the automobile, especially the size matching of the door cover. The matching state of the four doors and two covers of the car will directly affect the customer's first perception of the vehicle and the recognition and satisfaction of the vehicle.By using the method of PFMEA process analysis of a vehicle tail gate and side face poor matching poor around this potential failure mode is analyzed, by referencing the new technology, new process, increase the limit, to reduce the dimension chain, improve the detection rate and reduce the tail gate and side surface around the failure of big difference frequency, make the tail gate and side face around poor matching problem will be brought under effective control, product quality obtained the very good security. References | Related Articles | Metrics

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Analysis on the Application of PFMEA in the Manufacturing of General Assembly Workshop YANG Jiankang 2022, 47(4): 115-118.  DOI: 10.16638/j.cnki.1671-7988.2022.004.027 Abstract ( )   PDF (1153KB) ( )   In the process of body assembly in the general assembly workshop of vehicle enterprises, each section of interior trim line, chassis line, general assembly line, four-wheel positioning and repair has its own failure mode. If there is a quality problem, it will take a lot of time to check and affect the production efficiency. In this paper, combined with the actual case of the abnormal noise of the back door during the road test of our vehicle, the PFMEA tool is used to analyze and find out the causes of the abnormal noise of the back door, and the process optimization is carried out in the assembly process of the general assembly workshop in the early stage. On the basis of the subsequent process test verification, the quality problem of the abnormal noise of the back door during the road test is solved, the stability and safety of the vehicle body are improved. References | Related Articles | Metrics

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Comparative Analysis of Ultrasonic Welding and U-shaped Parts Crimping in Automobile Harness Production WANG Shihua 2022, 47(4): 119-122.  DOI: 10.16638/j.cnki.1671-7988.2022.004.028 Abstract ( )   PDF (1523KB) ( )   Ultrasonic welding and U-shaped parts crimping are two main ways of connecting between wires in automobile wiring harness and has been widely used in my company. Ultrasonic welding is mainly used in the connection between wires with cross-sectional area of more than 10 square millimeters, shielded wires, twisted pair wires and other wires with large current or high demand for signal transmission quality, U-shaped parts are generally used for crimping in addition to customer requirements for ultrasonic welding. In this paper, combined with my company's product application and actual processing of ultrasonic welding and U-shaped parts crimping, and these two ways are summarized and summarized, this paper introduces the connection modes of ultrasonic welding and U-shaped parts crimping in automobile wire harness manufacturing, and makes a comparative analysis of the advantages and disadvantages of these two ways, which can provide reference and direction for the selection of connection modes in automobile wire harness manufacturing. References | Related Articles | Metrics

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Analysis of Crimping Performance of High Voltage Terminal in Automotive High Voltage Wire Harness GAO Xiang 2022, 47(4): 123-126.  DOI: 10.16638/j.cnki.1671-7988.2022.004.029 Abstract ( )   PDF (2840KB) ( )   High-voltage wire harness is an important carrier of the power and signal transmission and distribution system of new energy vehicles, the compression performance of high-voltage wire hareness terminals is the most important performance index of new energy vehicles. The paper establishes a data analysis model from the high voltage beam terminal of new energy vehicles and finds the best suitable range of the terminal to improve the process ability and quality level of the high voltage harness. References | Related Articles | Metrics

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Failure Analysis and Reliability Improvement of a Heavy Truck Wire Harness LIU Ni 2022, 47(4): 127-130.  DOI: 10.16638/j.cnki.1671-7988.2022.004.030 Abstract ( )   PDF (6272KB) ( )   With the development of society,the number of heavy truck market in China has been rising year after year, customers for the comfort of heavy truck, intelligent demand, the vehicle electrical parts are more and more, followed by the vehicle electrical failure rate is gradually appearing. In the process of driving heavy truck, the electrical system failure often occurs due to the automobile wiring harness problem, which seriously affects the safety of the vehicle. This paper mainly deals with the experience of heavy truck wiring harness wear, lists the typical failure modes of wiring harness in the process of after-sale improvement, analyzes the causes of failure and puts forward effective rectification schemes, which can greatly reduce the after-sale cost of wiring harness and improve the reliability of the vehicle electrical system. References | Related Articles | Metrics

Automobile Education

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Exploration and Reflection on the Application of Blending Learning in the Course of Automobile Testing Technology CHAI Junlin 2022, 47(4): 131-134.  DOI: 10.16638/j.cnki.1671-7988.2022.004.031 Abstract ( )   PDF (2150KB) ( )   Blending learning is a new teaching mode which combines the online teaching with offline teaching, and making full use of the advantages of blending learning can improve the curriculum quality. Taking the Automobile Testing Technology course as an example, the article explores the design and practice of blending learning, analyzes the implementation effect, and then summarizes the teaching reflection, aiming at guiding the continuous improvement of the curriculum quality, at the same time, providing some reference for the blending learning of the same kind of courses. References | Related Articles | Metrics

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Testing Method of Magotan B8 Electric Rearview Mirror Control System WANG Yiping 2022, 47(4): 135-138.  DOI: 10.16638/j.cnki.1671-7988.2022.004.032 Abstract ( )   PDF (1450KB) ( )   In view of the modern car electric rearview mirror control system has many functions and complex structure, it is difficult to remove the fault. Taking Magotan B8 electric rearview mirror control system as the research object, through the analysis of its circuit diagram and working principle, this paper focuses on the analysis of the detection signal of the rearview mirror transfer switch EX11 signal and the working process, common faults and detection methods of the rearview mirror left and right regulating motor V17 control circuit. The results show that: the detection method can effectively find out the common faults of the control system, and can provide regular reference for other vehicle control systems. References | Related Articles | Metrics

Overview

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Review of Development of Hub Motor for Electric Vehicle CHEN Ge 2022, 47(4): 139-143.  DOI: 10.16638/j.cnki.1671-7988.2022.004.033 Abstract ( )   PDF (2971KB) ( )   Driven by multiple factors such as energy conservation and emission reduction, climate change, many countries are actively promoting the development of electric vehicle industry. Hub motor drive is a development direction of modern electric vehicle drive mode. This paper briefly introduces the advantages and characteristics of the hub motor drive technology, analyzes its research status at home and abroad, summarizes some problems and solutions of the hub motor, and points out the trend of the hub motor technology. References | Related Articles | Metrics

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Research on the Development of Hair-pin Winding Motors for Electric Vehicles MA Ke 2022, 47(4): 144-148.  DOI: 10.16638/j.cnki.1671-7988.2022.004.034 Abstract ( )   PDF (4500KB) ( )   The key technologies and development trends of Hair-pin winding motors for electric vehicles are discussed, including the manufacturing process of Hair-pin windings, the calculation of copper consumption and cooling technologies of motors. The characteristics of the Hair-pin winding motor are introduced, compared with the round wire winding motor, and the unique manufacturing steps of the Hair-pin winding are explained. The development and application of Hair-pin winding motors at home and abroad are introduced. The research status of copper loss and its calculation method of Hair-pin winding motor is introduced. Different cooling methods and calculation methods applied to Hair-pin winding motor are expounded, and their advantages are analyzed. The direction of the key technical solutions for Hair-pin winding motors is given, which provides a certain reference for the development of new energy vehicle technology. References | Related Articles | Metrics

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Basic Principle and Feasibility Analysis of Air-powered Vehicle TANG Gaopan 2022, 47(4): 149-152.  DOI: 10.16638/j.cnki.1671-7988.2022.004.035 Abstract ( )   PDF (1234KB) ( )   Compressed aerodynamic vehicles, also known as pneumatic vehicles, are a "zero-emission" new energy vehicles. This paper introduces the advantages of pneumatic vehicles and the basic structure and working principle of pneumatic vehicles, and then uses the numerical analysis method to verify its feasibility. References | Related Articles | Metrics

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Review of Vehicle Distance Measurement Based on Monocular Vision ZHANG Zhaozhen 2022, 47(4): 153-157.  DOI: 10.16638/j.cnki.1671-7988.2022.004.036 Abstract ( )   PDF (1972KB) ( )   References | Related Articles | Metrics

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Overview on the Research of Lateral and Longitudinal Control for Intelligent Vehicles HAO Yue 2022, 47(4): 158-161.  DOI: 10.16638/j.cnki.1671-7988.2022.004.037 Abstract ( )   PDF (900KB) ( )   In my country, with the improvement of people's living standards, the number of vehicles is also increasing at a double speed, which has caused a large number of traffic safety problems. Among them, traffic accidents caused by improper operation of drivers account for about 75% of all traffic accidents. The intelligent development of vehicles can well solve such traffic safety problems. The core technologies of intelligent vehicles mainly include three aspects: environmental perception, behavioral decision-making and motion control. Among them, motion control, as one of the core technologies of intelligent vehicles, has important research significance. The motion control of intelligent vehicles includes two parts: horizontal motion control and longitudinal motion control. Various methods of vehicle horizontal and longitudinal motion control are analyzed and introduced, including model predictive control, fuzzy logic control, neural network adaptive synovial control, direct control and hierarchical control. At the same time, the importance of horizontal and longitudinal coupling to realize motion control is introduced, and its research status is analyzed. Finally, the follow-up development direction of intelligent vehicle motion control is prospected, which is helpful for the further optimization and development of intelligent vehicle motion control. References | Related Articles | Metrics

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Overview of Research on Path Planning Algorithms for Self-driving Vehicles PAN Shaofei 2022, 47(4): 162-165.  DOI: 10.16638/j.cnki.1671-7988.2022.004.038 Abstract ( )   PDF (1690KB) ( )   Self-driving vehicles are a major direction of automotive development. The realization of self-driving vehicles depends on function of the perception, decision-making and control functions. Path planning is an important part of decision-making. At present, the path planning algorithm of self-driving vehicles is greatly affected by the environment and cannot be applied to the complex road environment. Based on this, the trajectory planning algorithm of the driverless car is summarized. It is including global path planning and local path planning that can be devided into several kinds and the principles of those are introduced with the advantages and disadvantages. It can be a reference to the researchers being interested in self-driving. References | Related Articles | Metrics

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Review of Driver's Seat Belt Detection Methods ZHANG Tao 2022, 47(4): 166-169.  DOI: 10.16638/j.cnki.1671-7988.2022.004.039 Abstract ( )   PDF (3461KB) ( )   As a very important passive protection measure, safety belt can effectively reduce the death rate of accidents. Therefore, by detecting whether the driver wears a seat belt, the death caused by not wearing a seat belt can be reduced and the safety awareness of the driver wearing a seat belt can be improved. This paper introduces several common safety belt detection methods, including detection methods based on image classification, detection methods based on target detection and semantic segmentation, and detection methods based on traditional target detection combined with SVM support vector machine. The results show that the traditional detection method needs a lot of preprocessing of images, which reduces the detection speed. The detection method based on deep learning is superior to the traditional detection method in speed and accuracy. References | Related Articles | Metrics

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Risk Assessment of Automotive Supply Chain Based on Value Model HUANG Chuanchuan 2022, 47(4): 170-173.  DOI: 10.16638/j.cnki.1671-7988.2022.004.040 Abstract ( )   PDF (1110KB) ( )   Due to such features as many partners involved, a long industrial chain, high collaboration between company nodes, the stability of automobile supply chain network is more susceptible by various external events under the background of changing market environment and fierce industry competition. Based on the three-level network of automobile supply chain, the value model is introduced to evaluate the supply chain risk of 15 enterprises by using the historical simulation method based on the stock price changes of enterprises at the nodes of the supply chain. The result shows that the core manufacturing enterprises generally have higher supply chain risk level compared with the supply enterprises and distribution enterprises, which provides theoretical basis and decision support for the risk control of enterprises in the automotive supply chain. References | Related Articles | Metrics