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15 February 2023, Volume 48 Issue 3 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Use and Maintenance
Automobile Education
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New Energy Vehicle

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Kinematics Analysis and Optimization of Front Suspension of a Electric Vehicle ZHANG Dejun 2023, 48(3): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2023.03.001 Abstract ( )   PDF (754KB) ( )   For the pure electric vehicle front suspension system developed by a company in the early stage, the multi-body dynamics software ADAMS is used to complete the simulation analysis of each working condition of the suspension system kinematics. The index deviates from the target value, and using the ADAMS software itself to optimize the function module, the detailed optimization of the hard point of the suspension system is carried out. By analyzing the variables through the design of experiments, the geometric hard point of the vehicle is optimized and the performance of the suspension system is improved. The results show that the change of the outer point of the steering tie rod has a great influence on the steering of the suspension system, which provides a good engineering reference for the performance design and development of electric vehicles. References | Related Articles | Metrics

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SOC Estimation of Lithium Battery Based on ARWLS and AUKF ZHOU Qin 2023, 48(3): 5-14.  DOI: 10.16638/j.cnki.1671-7988.2023.03.002 Abstract ( )   PDF (853KB) ( )   Precise estimation of lithium battery state of charge (SOC) has a profound impact on the safe and stable driving of pure electric vehicles. The estimation of lithium battery SOC state mainly includes two hot issues: parameter identification algorithm and SOC estimation algorithm. Aiming at the "data saturation" phenomenon in the identification process and the filtering divergence problem in lithium battery SOC state estimation, this paper proposes a joint algorithm of adaptive forgetting factor recursive least squares (ARWLS) and adaptive unscented kalman filter (AUKF). First, the mathematical model of the second order R-C lithium battery is established. Aiming at the "data saturation" phenomenon in the parameter identification process of the traditional least squares method, an adaptive forgetting factor is introduced to dynamically modify the weight of the new and old data, so as to improve the accuracy and efficiency of online parameter identification. Secondly, aiming at the filtering failure problem of unscented kalman filter, an adaptive unscented kalman filter algorithm is proposed to adaptively system noise and observation noise, so as to improve the adaptability and robustness of SOC estimation. Finally, three SOC estimation algorithms, extended kalman filter (EKF), unscented kalman filter (UKF) and AUKF, are simulated and compared under hybrid pulse power characterization (HPPC) working condition. The simulation results show that the SOC curve estimated by AUKF algorithm has the best performance following the change of the true value curve of SOC, and the estimation accuracy is also better than the other two algorithms, with smaller estimation error and the best convergence. References | Related Articles | Metrics

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Modeling and Simulation of Mobile Wireless Power Supply System for Electric Vehicles ZHOU Libo 2023, 48(3): 15-19.  DOI: 10.16638/j.cnki.1671-7988.2023.03.003 Abstract ( )   PDF (1637KB) ( )   In order to solve the problem of frequent charging and short cruising range when electric vehicles adopt the static wireless charging method, a mobile wireless power supply system for electric vehicles is designed and modeled and simulated. Firstly, an inverter circuit with multiple inverters in parallel is designed to meet the high power demand of the power supply system. Secondly, a bilateral LCC compensation topology is adopted, and the calculation and analysis are completed after T-transformation. Finally, a wireless power supply system with two primary windings in parallel and a single primary winding wireless power supply system are designed, and the model building and simulation are completed using MATLAB/Simulink. Simulation analysis shows that, compared with the wireless power supply system with single primary winding, the wireless power supply system with two primary windings in parallel has higher transmission power and efficiency. References | Related Articles | Metrics

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Analysis of Energy Flow Direction of Electric Vehicle and Research on Measures to Reduce Energy Consumption YU Fengzhu 2023, 48(3): 20-27.  DOI: 10.16638/j.cnki.1671-7988.2023.03.004 Abstract ( )   PDF (1666KB) ( )   Energy flow analysis is an important analysis method of energy consumption of new energy vehicles. Through energy flow analysis, we can comprehensively understand the distribution of power consumption of vehicle models, quantitatively find the energy consumption difference between sample vehicles and benchmark vehicles, and determine the starting point for the most effective improvement of energy consumption level. In this paper, the energy consumption mechanism of the whole vehicle is analyzed theoretically, and the key control items of energy consumption are mined; automatic control realizes real-time collection and data processing of various energy related physical quantities, and serves as the final acceptance standard of energy consumption reduction measures. Based on the high-precision measured data, the energy flow simulation model of the whole vehicle is established and calibrated. On the one hand, it accurately locates the potential energy conservation direction, and on the other hand, it serves as the theoretical support for the early prediction of the project development, optimizing the powertrain framework, component selection and design parameters, and finding the solution most conducive to energy consumption. References | Related Articles | Metrics

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Electric Drive Unit NVH Performance Integration for Commonality and Modularity LIU Hongling 2023, 48(3): 28-32.  DOI: 10.16638/j.cnki.1671-7988.2023.03.005 Abstract ( )   PDF (1360KB) ( )   For commonality strategy, the electric drive unit noise、vibration、harshness (NVH) performance integration technique is discussed in the paper. In electric vehicle development, one electric drive unit usually be adapted to many vehicles. Therefore, the electric drive unit itself and noise vibration harshness (NVN) transmission path were discussed to meet the vehicle requirement. The electric drive unit itself should be optimized as much as possible to meet the top level requirement of vehicle which it is used, with many optimization methods, such as pulse width modulation (PWM) control, gear accuracy, electromagnetic structure, shell structure and so on. Meanwhile, the "NVH transmission path" airborne noise transmission path and structure borne noise transmission path should be different to meet the different vehicle performance requirement, such as modal decoupling, vehicle package, sound package, sealing, vibration isolation, active sound modification technology and so on. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Security Evaluation of the On Board Unit in the Electronic Toll Collection WANG Jie 2023, 48(3): 33-38.  DOI: 10.16638/j.cnki.1671-7988.2023.03.006 Abstract ( )   PDF (5170KB) ( )   With the widespread use of electronic toll collection (ETC) systems, the cybersecurity risks are also increasing. In order to solve the problem of cybersecurity risk assessment of on-board units in ETC, the paper proposes a cybersecurity assessment framework for on-board units. The framework uses threat analysis to systematically analyze the potential threats faced by on-board units. Risk assessment is used to grade the potential threats. While, test cases are utilized to identify and verify the cybersecurity risk. Experiments show that the cybersecurity assessment framework can perform effective cybersecurity assessment on on-board units in ETC to identify potential cybersecurity risks, which provides an effective reference for protecting subsequent product. References | Related Articles | Metrics

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Safety Identification of Bus Driving Safety Based on Neural Network Learning WANG Wenbin 2023, 48(3): 39-43.  DOI: 10.16638/j.cnki.1671-7988.2023.03.007 Abstract ( )   PDF (968KB) ( )   This paper designs two programs, expression recognition and dangerous action recognition, such as the sudden physical illness of bus drivers, passengers grabbing the steering wheel, and the blankness of driving right transfer in the current L2 level intelligent driving. Among them, the expression recognition program is a face expression recognition program designed with Qt5 as the host computer using the Opencv computer vision library based on the Python language. First of all, the monitorability of relevant information is improved through the processing of input images, and the monitoring quality is improved, and then the expression model training and data acquisition are carried out, and finally the recognition function is realized. A LabVIEW-based dangerous action recognition program is also introduced. Through the video information transmitted by the camera, algorithms such as the inter-frame difference method and background learning are used to detect moving objects, so as to realize the real-time capture of foreign objects that may pose a threat to driving safety within the monitoring range. Experimental data show that the two programs can accurately and quickly capture the corresponding expressions and dangerous movements, which greatly improves the driving safety of buses while solving the above problems. References | Related Articles | Metrics

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Vehicle Automatic Lane Change Control Based on V2V QI Zihao 2023, 48(3): 43-48.  DOI: 10.16638/j.cnki.1671-7988.2023.03.008 Abstract ( )   PDF (967KB) ( )   With the development of vehicle-road cooperation technology, lane changing vehicles can share data and information with surrounding vehicles to improve lane changing efficiency and traffic safety. Based on the above analysis, this paper proposes a vehicle automatic lane change control method based on vehicle to vehicle (V2V), which is mainly divided into two parts: trajectory planning and trajectory tracking. The quintic polynomial based on time is used as lane-changing trajectory, and the path planning is carried out through the surrounding vehicle information obtained by V2V. Then, according to the planned trajectory, the sliding mode trajectory tracking algorithm is used to track the vehicle speed and steering wheel angle, so as to complete lane change. Finally, the CarSim-MATLAB/Simulink simulation proves that the proposed lane change control strategy is reasonable and effective in trajectory planning and tracking, and improves the lane change security. References | Related Articles | Metrics

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An Automatic Parking Control Method Based on Straight and Arc Path DAN Xiaojie 2023, 48(3): 49-53.  DOI: 10.16638/j.cnki.1671-7988.2023.03.009 Abstract ( )   PDF (1399KB) ( )   In order to realize safely and stably control the vehicle driving along the given straight and arc path in the process of automatic parking, combined with the classical proportion integration differentiation (PID) idea, a new control method is proposed, which reach the target steering wheel angle according to the advance steering distance and target angular speed, and then based on the current vehicle rear axle center position and heading information and the deviation between the target path point correction control method in this paper. Meanwhile according to the characteristics of the planned path, this paper also proposes a speed planning method, which is based on the uniform deceleration. The experiment result shows that the method can control the parking smoothly, and the control error meets the accuracy requirements. References | Related Articles | Metrics

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Vehicle Status Check and Analysis for LKAS Function Calibration TANG Chuanjun 2023, 48(3): 54-59.  DOI: 10.16638/j.cnki.1671-7988.2023.03.010 Abstract ( )   PDF (2627KB) ( )   Lane keeping assist system (LKAS) function is the basic function module of advanced driving assistance system (ADAS) function, it places a significance role for the realization of the advanced automatic driving function of the vehicle. The LKAS function is the basic functional requirement for realizing the lateral control of the vehicle control. Good steering performance of the vehicle is the basis for ensuring a good LKAS function. Therefore, before calibrating the LKAS function of the vehicle, it is necessary to check and validate the vehicle status. Analyze the problem issues and provide optimization solutions to ensure that the basic performance of the vehicle can meet the needs of LKAS calibration, and then meet the needs of ADAS function requirements. References | Related Articles | Metrics

Design and Research

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Study on Thermal Management System for Hybrid Vehicle ZHANG Zhiqiang 2023, 48(3): 60-63.  DOI: 10.16638/j.cnki.1671-7988.2023.03.011 Abstract ( )   PDF (1289KB) ( )   A thermal management system for series-parallel hybrid vehicle is designed and studied, which is based on the parameters of hybrid systems. Frist, inlet air volumes for all radiators on different critical conditions are simulated. Then, the simulation results show that the temperatures of high-temperature radiator and oil radiator are 1.5 °C and 3.8 °C higher than the design goals on the worst conditions, which are owed for the poor of inlet air volumes and defect of radiators layout. Finally, the fan and radiators layout are optimized. The inlet air volumes of high-temperature radiator and oil radiator are increased 9.37% and 8.4%. The temperatures of high-temperature radiator and oil radiator are reduced 4 °C and 4.1 °C, which are achieved the design goals. References | Related Articles | Metrics

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The Overall Design of WC1E Type Explosion-proof Trackless Rubber Tyred Vehicle WANG Renqun 2023, 48(3): 64-69.  DOI: 10.16638/j.cnki.1671-7988.2023.03.012 Abstract ( )   PDF (1065KB) ( )   In this paper, according to the conditions of the underground roadway and the characteristics of the typical work vehicle demand of the underground maintenance team, the design of the underground explosion-proof trackless rubber tyred vehicle is studied. By comparing the structure and traffic ability of the integrated and articulated explosion-proof trackless rubber tyred vehicles, it is determined that the design vehicle adopts the integrated structure, and the overall scheme design and the hard point parameters of the vehicle design are given. According to the requirements of the overall design scheme, the key systems such as the power system, transmission system, brake hydraulic system and hydraulic interconnected suspension of the trackless rubber tyred vehicle are designed and calculated, and the core components of each system are selected according to the calculation results. The explosion-proof trackless rubber tyred vehicle researched and designed in this scheme has compact structure and good power performance, can adapt to various working conditions in the coal mine, and has good comfort, and solves the vehicle demand of the underground maintenance team. References | Related Articles | Metrics

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Kinematic Mechanics Analysis of the Third Spring Device Based on Double Wishbone Suspension System NI Xiaojian 2023, 48(3): 70-73.  DOI: 10.16638/j.cnki.1671-7988.2023.03.013 Abstract ( )   PDF (1231KB) ( )   Because the double wishbone independent suspension structure can not completely solve the problem of vertical and roll line stiffness decoupling structure, the switching space between handling stability and ride comfort is very limited. In order to increase the handling stability of the high-performance vehicle and improve the pitch change range of the vehicle when braking and accelerating, this paper mainly designs the double wishbone suspension system of a highperformance vehicle equipped with a third spring device, and applies ADAMS/Car to conduct dynamic simulation analysis to verify the influence of adding the third spring on the trim stiffness and roll stiffness of the vehicle. It provides a reference for suspension dynamics analysis. References | Related Articles | Metrics

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Design and Verification of Composite Materials Vehicle Gas Cylinder DONG Beibei 2023, 48(3): 74-78.  DOI: 10.16638/j.cnki.1671-7988.2023.03.014 Abstract ( )   PDF (1215KB) ( )   Compared with traditional gas cylinders, composite materials gas cylinders have many advantages such as easy processing, low density and high strength.When the vehicle gas cylinders are made of composite materials, and the whole vehicle lightweight will be realized and energy consumption can be reduced. In this paper, a composite cylinder with a volume of 30 L is designed, according to the grid theoretical calculation method and the actual processing requirements, the basic dimensions of the liner and reinforcement fiber are designed. The finite element analysis ABAQUS software is used to analyze the strength of the cylinder to verify the rationality of the designed composite cylinder. This paper can provide some reference for the design of composite materials vehicle gas cylinder. References | Related Articles | Metrics

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Design and Modal Analysis of Automobile Glove Box WU Lin 2023, 48(3): 79-82.  DOI: 10.16638/j.cnki.1671-7988.2023.03.015 Abstract ( )   PDF (1270KB) ( )   As one of the important functional parts of interior trim, the design of glove box determines whether the performance of produced products can meet the needs of customers. This paper introduces the composition of the glove box and how to define some important parameters in the design and development process, such as the volume requirements of the glove box, the design and positioning strategy of the welding structure parameters of the glove box, the overlapping design of the lock tongue and the lock tongue sleeve, the size of the buckle opening and the design of the opening limit block of the glove box, in order to provide corresponding reference for the subsequent design of similar structures. At the same time, combined with the abnormal noise of glove box often occurred in the process of vehicle road test, this paper introduces the modal analysis of glove box by using the finite analysis ways. The analysis results show that the first-order frequency and second-order frequency of glove box are greater than 45 Hz, which meets the design requirements. Through the research of this paper, the mold repair cost caused by design defects can be reduced. References | Related Articles | Metrics

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Design Method and Practice for the General Layout of the Cab of a Heavy Truck ZHANG Yujia 2023, 48(3): 83-87.  DOI: 10.16638/j.cnki.1671-7988.2023.03.016 Abstract ( )   PDF (1684KB) ( )   This article mainly introduces the basic process and method of heavy truck cab in the process of general layout design, it is mainly used to guide engineers in the design of the overall layout of the cab of a heavy truck, and provides a certain empirical reference. Including the design methods and reference indicators of key hard point sizes such as ergonomics, body-in-white, instrumentation, seats, exterior decorations, etc., as well as the key contents to be paid attention to in the overall layout design process. This article provides basic assistance in the design of the overall layout of the cab of a heavy-duty truck. References | Related Articles | Metrics

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Analysis and Calculation of Automotive Air Conditioning Cold Load YANG Zilong 2023, 48(3): 88-94.  DOI: 10.16638/j.cnki.1671-7988.2023.03.017 Abstract ( )   PDF (1195KB) ( )   As a large energy-consuming body auxiliary equipment, automotive air conditioning is used to ensure the comfort of the vehicle occupants in summer and to take into account the fuel consumption. Therefore, by calculating and analyzing the heat load inside the vehicle, it is important to select a suitable automotive air conditioning system. In the article, a heat balance model is established and the steady state analysis is used to calculate the heat load entering the car at different times of the day and to analyze the different load components entering the car. The results show that the heat gain through the windows and the fresh air load entering the car account for nearly 50%, and the maximum heat load entering the car at 14:00 p.m. The total load is 3 664 W when the car speed is 45 km/h and the absorption rate is 0.85. This analysis has an important significance for the design of the cooling system of the car air conditioner. References | Related Articles | Metrics

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Modal Optimization of Power Battery Cover Based on Topography Optimization LIU Xuerong 2023, 48(3): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2023.03.018 Abstract ( )   PDF (1168KB) ( )   The modal of the power battery cover directly affects the noise, vibration, harshness (NVH) performance and structural durability of the whole vehicle. In order to improve the modal performance of the power battery cover, the cover structure is optimized by using topography optimization method. Based on solver MSC. Nastran analyzed the modal of the power battery cover. According to the analysis results, the first modal that is of great concern was optimized by using the topography optimization method. By changing the structural characteristics of the cover, the first modal of the cover is increased from 9.6 Hz to 25.61 Hz. The results show that the topography optimization technology can effectively improve the modal of the power battery cover, which provides a reference for the optimization design of the power battery cover. References | Related Articles | Metrics

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Design of Speed Regulation Module for Automobile Air-conditioning DC Brushless Blower GONG Xiaoqing 2023, 48(3): 100-106.  DOI: 10.16638/j.cnki.1671-7988.2023.03.019 Abstract ( )   PDF (1920KB) ( )   Most of the direct current (DC) brushless blower speed regulation module using the commutative control algorithm will lead to the torque fluctuation of the blower motor, which reduces the stability of the motor output air volume. MC9S12XDP100 is used to design the speed regulation module of DC brushless blower, and hardware and software systems are developed, and the vector control double closed-loop algorithm is designed in this paper,and the expert system fuzzy proportion integration differentiation (PID) is used to adjust the parameters in the speed outer loop. Through the test of speed, air volume and other related parameters, the experiments show that the speed regulation module solves the problem of torque fluctuation caused by the commutation control algorithm effectively and improves the output stability of air volume of air conditioning blower effectively. References | Related Articles | Metrics

Testing and Experiment

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Failure Analysis and Improvement of Anti-roll Bar Bracket YANG Yufei 2023, 48(3): 107-111.  DOI: 10.16638/j.cnki.1671-7988.2023.03.020 Abstract ( )   PDF (4118KB) ( )   Heavy commercial vehicles increase the vehicle's anti-roll ability by adding lateral anti-roll bar, and the reliable connection of the lateral anti-roll bar to the body can ensure that the vehicle can still drive stably under complex conditions. The article is based on the frequent fracture of the anti-roll bar bracket bolts of a certain type of dump truck under the driving conditions of the mine area with heavy load sharp turns and downhills. Through the failure analysis of the bolt fracture of the lateral anti-roll bar bracket, it was determined that the cause of the bolt failure was fatigue fracture at the junction surface between the anti-roll bar bracket and the anti-roll bar suspender assembly. Secondly, combined with the dynamic analysis of the vehicle in combination with the turning conditions, when the vehicle rolls, the lateral anti-roll mainly produces anti-roll force through torsion or bending, and further analysis shows that the fatigue fracture of the bolt is caused by the combined effect of shear force and torsional force. Finally, the anti-roll bar bracket structure is optimized, and the road verification results show that the fatigue life of the new structure is increased, which can be applied to harsh and complex driving conditions such as mining areas. The research has certain guiding significance for heavy commercial vehicles to cope with complex driving conditions and improve vehicle stability. References | Related Articles | Metrics

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Analysis and Improvement of Diesel Vehicle Rapidly Speeding-up Noise WEI Shanjing 2023, 48(3): 112-117.  DOI: 10.16638/j.cnki.1671-7988.2023.03.021 Abstract ( )   PDF (1769KB) ( )   To solve the abnormal acceleration noise of diesel vehicle, did the noise,vibration, harshness (NVH) test for the diesel vehicle. Through spectrum analysis found that the abnormal noise was the broadband noise of 2 500 Hz and 5 000 Hz. And analyzed the vibration frequency characteristics of related parts, found that the cooling system of the supercharger was the main propagation path. Optimized the cooling tube by adding a muffler, and obtain a great effect. The validation show that the broadband noise of 2 500 Hz and 5 000 Hz decrease respectively 5 dB(A) and 10 dB(A) and the abnormal noise remove. The result show that the noise will be improved by optimizing the structural parameters of silencer. References | Related Articles | Metrics

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Comparison of Bending and Torsional Stiffness Test and Simulation for Body in White WANG Duohua 2023, 48(3): 118-121.  DOI: 10.16638/j.cnki.1671-7988.2023.03.022 Abstract ( )   PDF (1641KB) ( )   The stiffness of car body in white affects the riding comfort and safety of drivers and passengers at the same time. Taking a passenger car body in white as the research object, this paper obtains the bending static stiffness and torsional static stiffness of the body in white by using the test method and computer numerical simulation method respectively. Through the comparative analysis of the results, it is found that the stiffness values of the body in white obtained by the two methods meet the design requirements, and the stiffness curves obtained by the two methods are very smooth, indicating that the overall stiffness design of the body in white is reasonable. The results verify the reliability of the two methods and provide data reference for the design of the body in white. References | Related Articles | Metrics

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Active Safety Test Device Based on GPS and Inertial Navigation YANG Xinpeng 2023, 48(3): 122-125.  DOI: 10.16638/j.cnki.1671-7988.2023.03.023 Abstract ( )   PDF (1293KB) ( )   In order to meet the testing requirements of automatic emergency braking (AEB) in the automobile active safety test standard, this paper discusses an active safety test device based on global positioning system (GPS) and inertial navigation device. The testing device includes automated driving robot, navigation mobile platform, real time kinematic (RTK) base station and personal computer (PC) control system. PC software of the control system can set different test scenarios according to the demand of China-new car assessment programme (C-NCAP). It can drive the test vehicle and navigation mobile platform in accordance with the prescribed route and speed that set in the control system. And it can send and achieve the data and signal between the automated driving robot and the navigation mobile platform. The test device can be used for car-to-car rear (CCR) test of AEB in C-NCAP. According to the test performance, it has practical application value in AEB tests. References | Related Articles | Metrics

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Simulation Analysis of Vehicle Handling Stability Based on Trucksim LV Kunpeng 2023, 48(3): 126-129.  DOI: 10.16638/j.cnki.1671-7988.2023.03.024 Abstract ( )   PDF (1160KB) ( )   The research on vehicle handling stability is of great significance to ensure the driving safety of the vehicle. In this paper, based on the Trucksim simulation platform, a reasonable passenger vehicle model is constructed according to the specific design parameters of the vehicle. After the parametric modeling of the whole vehicle, four tests closely related to the vehicle rollover are selected for simulation verification. The simulation results are in line with expectations and have high precision, each parameter index conforms to relevant regulations and driving safety requirements. After in-depth research and analysis of the simulation results, the influence of each parameter on the vehicle handling stability is obtained. The appropriate use of Trucksim has positive guiding significance for the early development and later experimental verification. References | Related Articles | Metrics

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A Car Handling Stability Objective Test Method and Evaluation YANG Fei 2023, 48(3): 130-135.  DOI: 10.16638/j.cnki.1671-7988.2023.03.025 Abstract ( )   PDF (4378KB) ( )   This article mainly tests the operation stability test of the vehicle, according to 8 operation objective stability tests, so as to provide a basis for improving the operation stability of the vehicle and improving the safety of the vehicle. Through the objective test of in-situ steering, rolling steering, slope braking, On Center (steering wheel middle position steering), steady state rotation, sweep steering, double shift line, angular step and other test methods to obtain the key parameters and curves of the sample vehicle stability performance. Based on these data, can judge the sample car each hold steady performance, concluded that the car has the characteristics of the steering, operation of the steady performance optimization basis, for the model can provide data support for the chassis adjustment, eventually lay the foundation for vehicle stability and safety, so as to improve the operation stability and safety of the model. References | Related Articles | Metrics

Process and Equipment

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Application Overview of Carbon Fiber Composite in Automobile LI Zhihu 2023, 48(3): 136-141.  DOI: 10.16638/j.cnki.1671-7988.2023.03.026 Abstract ( )   PDF (1744KB) ( )   Carbon fiber composite is one of the excellent lightweight materials with the advantages of low density, high modulus and high specific strength. The application situation of carbon fiber composite materials in automobiles at home and abroad in recent years. It is found that although carbon fiber composite materials have excellent lightweight effect, there are many problems such as high cost, complex process and low efficiency. At present, it is mainly suitable for application in high-end models at home and abroad. In order to explore the application trend of carbon fiber composites in automobiles, this paper analyzed the application situation of carbon fiber composites in automobiles at home and abroad in recent years. It is found that although the lightweight effect of carbon fiber composite was excellent, but it was mainly suitable for application in high-end vehicles for high cost, complex process and low efficiency. At present, it is mainly suitable for application in high-end models at home and abroad. Because carbon fiber composite had a dazzling appearance, it was popular with young people. The development of carbon fiber composite exterior parts in the form of "sports kit" would be the main growth point of the application of carbon fiber composite in automobiles in the future. References | Related Articles | Metrics

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The Application of QC Tools in Reducing the Rework Rate of Tie Rod Connection Nuts YONG Liang 2023, 48(3): 142-149.  DOI: 10.16638/j.cnki.1671-7988.2023.03.027 Abstract ( )   PDF (3117KB) ( )   After a certain model was put into mass production, the production line frequently had the problem of unqualified tie rod connection nuts, which led to a sharp increase in the monthly rework rate. Therefore, through the application of quality control (QC) tools, adopting the brainstorming method and the simple chart method to analyze the causes, the investigation determined that the failure of the sleeve to find the nut and the failure of the lock hole to find the lock pin were the key factors causing the rework rate of tie rod connection nuts. According to the 5W1H principle, countermeasures were formulated and improvement measures were optimized to reduce the rework rate from 12.53% to 1.25%. References | Related Articles | Metrics

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Analysis of Particle Contamination in Packaging Links in Automotive Silicon Wafer Production Process ZHENG Xiaodong 2023, 48(3): 150-153.  DOI: 10.16638/j.cnki.1671-7988.2023.03.028 Abstract ( )   PDF (1448KB) ( )   In the semiconductor manufacturing process, the packaging process requires nitrogen filling and vacuuming of automotive silicon wafers. This process is very important for the transportation and preservation of automotive silicon wafers. This paper mainly studies the degree of contamination of automotive silicon wafers by the packaging process, the impact on the process and the methods to reduce this impact. Due to the requirements of stability, non-polluting and anti-oxidation in the packaging process, it is necessary to carry out the process steps of nitrogen filling and vacuum suction on the automotive silicon wafer box containing the automotive silicon wafer, so as to remove the water vapor in the automotive silicon wafer box and oxygen is eliminated, and at the same time, the car silicon wafer box is filled with dry nitrogen, so as to avoid the formation of oxides on the surface of the car silicon wafer and improve the yield of the car silicon wafer. The reasons for the excessive particle pollution of automotive silicon wafers caused by the packaging process are analyzed, and by optimizing the packaging equipment and process flow of automotive silicon wafers, the impact of packaging processes on the particle pollution of automotive silicon wafers is effectively reduced. References | Related Articles | Metrics

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Weldability Analysis of Resistance Spot Welding of Hot-formed Steel and Dual-phase Steel for Automobiles LIU Yingkai 2023, 48(3): 154-158.  DOI: 10.16638/j.cnki.1671-7988.2023.03.029 Abstract ( )   PDF (2269KB) ( )   In order to study the difference of welding properties between hot-formed steel and dual-phase steel for automobile, 1.5 mm hot-formed steel HS1300T and 1.5 mm dual-phase steel DP590T were respectively used for resistance welding with 1.9 mm cold-rolled steel plate CR1180T, and the weldability interval, weld consistency and macroscopic morphology of welds were studied. Studies have shown that dual-phase steels have a larger weldability current range than hot-formed steels. Continuous welding of 500 welds, hot-formed steel plate are more prone to spatter, and the weld numbers of spatter is 3.72 times that of duplex steel. Under the optimal welding parameters, the indentation depth of the hot-formed steel is deeper, which is 2.62 times that of the dual-phase steel and the hot-formed steel is easier to form shrinkage cavity. Under the same welding conditions, the weldability of dual-phase steel is better than that of hot-formed steel. References | Related Articles | Metrics

Use and Maintenance

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Knowledge Graph Analysis of Domestic and Foreign Auto Insurance Industry Based on CiteSpace LIU Dong 2023, 48(3): 159-163.  DOI: 10.16638/j.cnki.1671-7988.2023.03.030 Abstract ( )   PDF (4911KB) ( )   This paper analyzes the knowledge graph of domestic and foreign auto insurance industry literature and patents in the past 20 years, in order to explore the development process, research hotspots and foreword trends of auto insurance industry at home and abroad, and to provide guidance for the auto insurance industry. CiteSpace software was used to search and filter the Chinese web site, Web of Science database and Derwent patent database, to complete the keyword co-occurrence analysis, keyword clustering time line analysis and key emergent word analysis, and to generate the knowledge map for visualization and analysis respectively. The knowledge mapping analysis shows the hot spots of research technology in the field of auto body industry at home and abroad, and the domestic should further improve the digital level of auto body equipment and promote independent innovation. References | Related Articles | Metrics

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High Voltage Power on Process and Fault Analysis of Pure Electric Vehicle LU Kai 2023, 48(3): 164-169.  DOI: 10.16638/j.cnki.1671-7988.2023.03.031 Abstract ( )   PDF (1095KB) ( )   According to the current development trend of pure electric vehicles and the increasing number of pure electric vehicle failures, it aims to strengthen the mastery of the structure and principle of pure electric vehicles by ordinary maintenance personnel. First of all, the article analyzes the control relationship between the high-voltage system of pure electric vehicles, and analyzes the control logic of the high-voltage power-on process of Geely Emgrand EV450 model in detail. According to the mastered logic of high-voltage power-up control, it is mainly divided into five categories: high-voltage interlock disconnection failure, high-voltage contactor adhesion failure, vehicle controller failure, battery management system failure, and motor controller failure. Finally,according to the actual case of Geely Emgrand EV450, it analyzes the possible causes of the failure of the high-voltage system to power. The analysis process is mainly through the owner's description of the fault phenomenon, the recovery of fault phenomenon and the fault code displayed by the fault diagnosis instrument for diagnostic trouble code (DTC) analysis. It is confirmed that it is a vehicle control unit (VCU) power supply failure or VCU's own fault, and then the VCU power line is tested. After testing and analysis, it is confirmed that the cause of the high-voltage failure is +B power supply fuse damage. Therefore, when troubleshooting and analyzing, you not only have a good understanding of high and low voltage electronic control, but also master the control logic between vehicle control unit, battery management system, motor control unit and other systems.In case of failure, you can comprehensively judge the fault range according to the fault phenomenon and fault code. References | Related Articles | Metrics

Automobile Education

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The Development and Practice of the Core Curriculum System for the Working Process Systematization in the Connection of Secondary and Higher Vocational Curriculum —Take the New Energy Vehicle Major of Guangxi Logistics Vocational and Technical College as an Example MO Jun 2023, 48(3): 170-173.  DOI: 10.16638/j.cnki.1671-7988.2023.03.032 Abstract ( )   PDF (1178KB) ( )   The systematic development of the professional core curriculum system that connects middle and higher vocational education is of great significance to improving the comprehensive quality of higher vocational students and strengthening professional skills. Research the practice of the method based on the systematization of the work process in the reform of the curriculum system of the new energy vehicle specialty. Screen, analyze and refine the typical work tasks of the work process into main action areas, convert the action areas into learning areas, and optimize and reorganize the learning areas into professional courses. Constructing a professional core curriculum system according to the law of career growth and cognitive learning. This paper explores the ideas, processes, system construction and implementation of the professional core curriculum system construction. It provides a reference for the curriculum construction of professional high-quality technical and technical personnel training in the field of equipment manufacturing and transportation References | Related Articles | Metrics

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Exploring the "123" Innovation Practice Mode of Automotive Majors Integrating Science and Technology Competition WANG Sheng 2023, 48(3): 174-179.  DOI: 10.16638/j.cnki.1671-7988.2023.03.033 Abstract ( )   PDF (1235KB) ( )   Under the background of national engineering education reform and "new four" changes in automobile industry, exploring innovative practice education mode with engineering majors and cultivating high-quality engineering science and technology talents is an important way to promote the construction of "new engineering" in colleges and universities, and it is also a powerful guarantee to serve the rapid changes of automobile industry. In order to effectively implement innovative practical education, North Central University has explored the innovative practice model under the "new engineering" from two aspects: building the practice system and exploring the cultivation mode of the existing automotive majors.Firstly, it integrates the high-quality teaching resources and science and technology competitions of automobile majors to build the "123" innovative practice system with the dual functions of cultivating innovative consciousness and training innovative ability; secondly, it combines the specific learning conditions of automobile majors and the characteristics of discipline competition practice to explore the nurturing mode throughout the whole process of undergraduate talent training. Relying on this system, students' innovation ability and hands-on ability can be significantly improved, and they have obvious competitive advantages in hands-on practice, further education and employment, and competition awards. The innovative practice system has been proved to be practical and feasible by practice and data, and has a good effect of cultivating people in practice. References | Related Articles | Metrics

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Analysis of the Teaching Standard of the Integration of Secondary and Higher Vocational Education in Automobile Service and Marketing ZHU Guiying 2023, 48(3): 180-185.  DOI: 10.16638/j.cnki.1671-7988.2023.03.034 Abstract ( )   PDF (1029KB) ( )   The training of integrated talents in secondary and higher vocational education is an inevitable trend of the development of modern vocational education system. The inherent demand for improving the quality of talent training. In the training of integrated talents in automobile service and marketing, there are some phenomena such as unclear training positioning, imperfect curriculum system structure, insufficient ability level upgrading, etc. In combination with the characteristics of regional economic development in Zhejiang province, the professional needs of the automobile industry have been fully studied. Scientifically evaluated the rationality of the existing occupational classification, specifically analyzed the post tasks and professional abilities of the automobile service and marketing specialty, studied the teaching standard and technical scheme of the specialty, and provided a practical reference standard for the clear talent training target positioning of the automobile service and marketing specialty in secondary and higher vocational colleges. References | Related Articles | Metrics

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Exploration and Consideration on the Construction of Automobile Capability Center —Take Jiuquan Vocational and Technical College as an Example CHAI Bin 2023, 48(3): 186-190.  DOI: 10.16638/j.cnki.1671-7988.2023.03.035 Abstract ( )   PDF (1248KB) ( )   In order to improve the employment rate, higher vocational colleges adapt themselves to the demand of the employment market by constantly adjusting the training objective and the study field of the talent training program every year, which approach only pays attention to the training form but neglects the ability objective of the talent, the school can not form its own characteristics, leading to the curriculum and teaching content of instability and randomness, students can not be a good job to obtain the vocational action required by the post. Jiuquan Vocational and Technical College breaks the convention, creates the automobile ability center, takes the professional ability training as the goal, explores the practice to train the ability as the center teaching pattern, this paper makes a breakthrough in curriculum standard, teaching process design, teaching ability evaluation and so on, and provides a model for the teaching reform of automobile specialty in other higher vocational colleges. References | Related Articles | Metrics

Overview

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Modeling of Illegal Driving Behavior Based on Extended Theory of Planned Behavior WANG Yidong 2023, 48(3): 191-197.  DOI: 10.16638/j.cnki.1671-7988.2023.03.036 Abstract ( )   PDF (1373KB) ( )   In order to study the mechanism of motor vehicle drivers' illegal driving behavior and its impact on subsequent driving behavior, combined with China's current driving environment, a questionnaire conforming to China's driving environment and driving characteristics is compiled, and three illegal driving behavior factors are refined: habitual violation (I1), dangerous violation (I2) and negligent violation (I3). On the basis of planned behavior theory, three variables of “execution intention”, “subsequent driving behavior” and “follow-up driving behavior scale” are added, and a structural equation model of illegal driving behavior based on extended theory of planned behavior (EX-TPB) is constructed. The results show that: the model has good explanatory ability and predictive ability for analyzing illegal driving behavior. Behavioral attitude (AT) and subjective norm (SN) have no significant influence on drivers' behavioral intention to execute safe driving. Both perceived behavioral control (PBC) and illegal driving behavior (IDB) have a positive effect on the intention to execute subsequent safe driving behaviors, and the results are significant. Safe driving behavior intention (BI) has positive influence on subsequent safe driving behavior. Executive intention (EI) is the intermediary variable of behavioral intention into actual behavior, and improves the explanatory power of subsequent safe driving behavior; the difference by the driving of information analysis shows that the higher the actual driving experience of the pilot in the habitual violations and negligence sexual abuses have significant differences, weekly driving frequency, the higher the drivers are more likely to lead to habitual violations and negligent violation, is punished for violation occurred three times in a year or more drivers to be fined 0 to 2 times the driver has a higher tendency of negligence sexual violation. References | Related Articles | Metrics

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Research and Development Status of Magneto-rheological Shock Absorbers PENG Jiaqi 2023, 48(3): 198-203.  DOI: 10.16638/j.cnki.1671-7988.2023.03.037 Abstract ( )   PDF (1571KB) ( )   Magneto-rheological shock absorber is a new type of shock absorber with continuously variable damping force, rapid response, simple mechanical device and small external input energy. In recent years, non-renewable energy sources have been increasingly depleted and carbon emissions have been too high. Based on the principle of sustainable development, new energy vehicles and electric vehicles will become an inevitable choice for the development of automobiles. Electronic and intelligent magnetorheological the shock absorber will surely achieve great development and application. The article first introduces the core technology of magnetorheological dampers, studies the settlement stability of magnetorheological materials and the solution to the energy problem of magnetorheological dampers, and then discusses the future development of magnetorheological dampers. Finally, the current research on magnetorheological dampers is summarized. References | Related Articles | Metrics

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Research Status of Hub Motor and Friction Braking Integration Technology CHU Boshi 2023, 48(3): 204-210.  DOI: 10.16638/j.cnki.1671-7988.2023.03.038 Abstract ( )   PDF (1774KB) ( )   As the development direction of the drive system of electric vehicle in the future, the hub motor has a broad application prospect. The integrated design and cooperative control of the hub motor and the friction braking system is one of the key technologies to be solved urgently in the electric vehicle brake system. In this paper, the necessity of research on the integration technology of hub motor and friction brake was discussed in the electric vehicle, the research status of hub motor technology at home and abroad and the integration technology and friction brake were analyzed. Meanwhile, some specific applications of hub motor technology in electric vehicles, the integrated design structure of hub motor and friction brake, and the cooperative control strategy of hub motor and friction brake were summarized, and some problems and development trends of the integration technology of hub motor and friction brake were put forward. References | Related Articles | Metrics

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Research and Technology Prospect of Electric Drive Platform for All Terrain Special Vehicles YANG Bing 2023, 48(3): 211-214.  DOI: 10.16638/j.cnki.1671-7988.2023.03.039 Abstract ( )   PDF (1768KB) ( )   This paper is to analyze the difficulties in technical upgrading of the power system of special all-terrain vehicle fueled by gasoline, gas and diesel, and put forward an electric drive system of special all-terrain vehicle. Through deep integration of electric drive unit modules, technology iteration is carried out to achieve hardware platform and modular highly integrated technology, thus reducing product cost and improving electric drive efficiency, and providing research direction for exploring the development of electric drive technology for special all-terrain vehicles in the future. References | Related Articles | Metrics

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Analysis on Integrated Development Platform of Visual Industrial App Driven by Automobile Model ZHU Jun 2023, 48(3): 215-220.  DOI: 10.16638/j.cnki.1671-7988.2023.03.040 Abstract ( )   PDF (2789KB) ( )   Industrial software and industrial application (App) involve many professional fields and a wide range, requiring the in-depth participation of front-line professional and technical personnel in research and debugging. In order to solve this problem, the paper focuses on the development and Application of industrial App in the field of research and development (R&D) and design, proposes an integrated development technology and platform of industrial App based on automobile mechanism model, discusses the design ideas and technical implementation paths of the platform, and focuses on the key technologies of the platform with the compilation, analysis and solution engine of automobile mechanism model, the integration and adaptation of industrial software, and the assembly and release of visual model components as the core. At the same time, the Application cases and implementation effects in the automobile industry are listed. The results show that the platform can assist R&D and design engineers to quickly develop industrial Apps, effectively improve work efficiency with the help of industrial Apps, and promote enterprises to improve quality, reduce cost and increase efficiency. References | Related Articles | Metrics