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28 February 2023, Volume 48 Issue 4 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
Standards Regulations Management
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New Energy Vehicle

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Performance Simulation Analysis of Pure Electric Vehicle Air Conditioning Control System TANG Jinxiang 2023, 48(4): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2023.04.001 Abstract ( )   PDF (534KB) ( )   The air conditioning system of pure electric vehicle is a nonlinear and time-varying system, so it is not easy to get the mathematical model of the system. The conventional proportion integration differentiation (PID) control strategy is not effective, so this paper conducts simulation research on the air conditioning system of pure electric vehicle using fuzzy control strategy. Firstly, the heat load of summer car compartment is calculated, and the mathematical model of the system is established in Simulink under Matlab software. Then the Fuzzy Logic Controller module of the system is designed in Simulink. Finally, variable parameter simulation is carried out on the whole system. By changing the number of passengers in the cabin, the speed of the vehicle, the temperature outside the vehicle and the temperature inside the vehicle, simulation research is carried out. The results show that the temperature inside the air conditioning system of pure electric vehicle with fuzzy control strategy reaches the set temperature in a short time and the fluctuation is not large. In line with the performance requirements of pure electric vehicle air conditioning on response time, overshot, variable load capacity, compared with the traditional PID strategy control effect is better. References | Related Articles | Metrics

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Analysis of Water Distribution in Vehicle Proton Exchange Membrane Fuel Cell ZHOU Yu 2023, 48(4): 5-8.  DOI: 10.16638/j.cnki.1671-7988.2023.04.002 Abstract ( )   PDF (520KB) ( )   Water management for vehicle proton exchange membrane fuel cell can improve the performance of the battery, which is of great significance for the promotion of hydrogen fuel cell vehicles. Understanding the law of water concentration distribution in proton exchange membrane fuel cell is the basis for water management of the cell, the influence of the battery operating temperature and discharge voltage on the water concentration distribution is explored in this paper, firstly, the single model of direct current proton exchange membrane fuel cell is built based on COMSOL Multiphysics; secondly, the operating temperature and discharge voltage of the single cell model are changed respectively, and the model is calculated by simulation to obtain the law of water distribution in the battery under the operating temperature and discharge voltage of different batteries. The results show that with the increase of temperature, the water content decreases; when the discharge voltage increases, the water content decreases greatly. In practical applications, the operating temperature of the battery should be increased as much as possible within an appropriate range, and a lower working voltage should be used comprehensively considering the battery performance, which is conducive to maintaining the water balance inside the battery. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Obstacle Avoidance Trajectory Planning for Autonomous Vehicles XU Jingxian 2023, 48(4): 9-13.  DOI: 10.16638/j.cnki.1671-7988.2023.04.003 Abstract ( )   PDF (758KB) ( )   At present, unmanned driving is developing rapidly, and obstacle avoidance trajectory planning in the urban operating environment is one of the core issues. How to avoid corner collisions that may occur during the trajectory discrete optimization process has gradually become a research hotspot. This article compares the advantages and disadvantages of the coordinate system in the trajectory planning and selects the Cartesian coordinate system. It proposes a self-vehicle model that considers the shape of the vehicle. Based on the vehicle model, it combines a new obstacle boundary processing method to further investigate possible collisions and dangerous areas to simplify environmental information in order to achieve the effect of avoiding collision detection and reducing time-consuming planning. Combined with the positional relationship between the vehicle and the surrounding obstacles, the article proposes the use of motion corridors, combined with the Minimum Snap optimization theory for hard-constrained trajectory optimization, and finally proves that the method is feasible through simulation verification, and can effectively meet the safety and comfort requirements in obstacle avoidance scenarios. References | Related Articles | Metrics

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Lateral Control Method of Intelligent Vehicle WU Chen 2023, 48(4): 14-17.  DOI: 10.16638/j.cnki.1671-7988.2023.04.004 Abstract ( )   PDF (527KB) ( )   Intelligent vehicle is a new research hotspot in the automobile industry in recent years, which is an effective means to relieve traffic pressure and reduce traffic accidents, and lateral control is a hotspot and difficult point in the field of intelligent vehicle research. This paper introduces three dynamic models, including two degree of freedom model and three degree of freedom model, which are used in the research of intelligent vehicle lateral control, and expounds the research status, advantages and disadvantages of proportion integration differentiation (PID) control, pure pursuit control and other common intelligent vehicle lateral control methods at home and abroad. Finally, according to the research status, it analyzes the future development direction of intelligent vehicle lateral control. References | Related Articles | Metrics

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Longitudinal Collaborative Control on Vehicle Platoon Based on V2V Communication YIN Kangchao 2023, 48(4): 18-22.  DOI: 10.16638/j.cnki.1671-7988.2023.04.005 Abstract ( )   PDF (1140KB) ( )   The traditional fleet only relies on radar or visual sensors for perception when implementing vehicle longitudinal platoon control, resulting in limited ability of vehicles to obtain information and unable to meet the following performance of vehicles in complex traffic environments. In order to overcome the shortcomings of radar and sensors, this paper applies the vehicle network vehicle to vehicle (V2V) communication technology to the longitudinal cooperative control system of the vehicle, and conducts data exchange through the communication between the on board unit (OBU) mounted on the vehicle. First, the control strategy of the team's longitudinal following is designed, and the distance following strategy with a fixed headway is selected, and the speed of the rear vehicle is adjusted according to the status feedback of the preceding vehicle. This method can ensure the safety of the following vehicle and improve the stability of the following vehicle. Then, based on Prescan/Simulink, the model and experimental scene of the fleet longitudinal cooperative control system are established. The simulation results prove the accuracy of the vehicle longitudinal following control strategy and the accuracy of the distance following strategy. References | Related Articles | Metrics

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Method of Multi-target Vehicle Detection and Tracking Based on Deep Learning WANG Feng 2023, 48(4): 23-30.  DOI: 10.16638/j.cnki.1671-7988.2023.04.006 Abstract ( )   PDF (1503KB) ( )   This paper uses MTALAB software as the main platform, and establishes a multi-target vehicle detection and tracking method based on deep learning. Firstly, a deep learning-based model is established for training vehicle datasets of different scenarios, and the datasets are labeled and format normalized. Then uses the K-means clustering algorithm to anchor the frame, establishes a neural network framework based on the YOLOv3 SPP algorithm, and uses the non-maximum suppression (NMS) algorithm to obtain the final prediction frame. At last, the neural network model is trained. Meanwhile, it is tested and evaluated. The study shows that this model can accurately detect and track multi-target vehicles. References | Related Articles | Metrics

Design and Research

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Design and Optimization of Racing Seat Based on ANSYS and Ergonomics CAO Jiatan 2023, 48(4): 31-34.  DOI: 10.16638/j.cnki.1671-7988.2023.04.007 Abstract ( )   PDF (1127KB) ( )   Today, race seats to meet the requirements of comfort, safety, high strength, lightweight, ergonomic factors are often an important way to improve competitiveness, so follow the principle of ergonomics is the design of excellent race seats, occupy the market prerequisite. However, in the traditional method, a certain solid sample is often used for testing to explore the use effect and actual quality of products. This method is lack of competitiveness in today's environment, economic investment and analysis of test results is complex, time-consuming and laborious in this paper, the application of ergonomics to design for the car seat using UG software to seat model, application of ANSYS software to optimize adjustment to conclude with a better scheme of seats to quickly validate design scheme. In order to save the time of product development and reduce the test cost, the range of product material and modeling parameters in the solid test should be reduced. References | Related Articles | Metrics

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Design and Simulation of Anti-rear-end Collision External Airbag Warning System CHEN Yifan 2023, 48(4): 35-40.  DOI: 10.16638/j.cnki.1671-7988.2023.04.008 Abstract ( )   PDF (1668KB) ( )   Rear-end collision on expressway is very destructive to cars and the casualty rate is very high. In order to reduce the injury caused, an external airbag warning system is designed. The system determines and analyzes the danger through mathematical model, and takes three measures, namely, safety distance warning, external airbag point explosion and seat belt pre-tightening, to remove the impact force of collision to the maximum extent. To realize pre-collision warning, pre-collision restraint of the human body, point explosion of air bags, in the event of a rear-end accident to provide the most comprehensive protection for the occupants. The joint model of CarSim and Simulink is established to verify the feasibility of the system. References | Related Articles | Metrics

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A-pillar on-board Blind Area Intelligent Display System CAO Shengfu 2023, 48(4): 41-47.  DOI: 10.16638/j.cnki.1671-7988.2023.04.009 Abstract ( )   PDF (1440KB) ( )   The overall number of traffic accidents in China is increasing year by year, and the A-pillar blind area is one of the main causes of traffic accidents. There are some problems in the domestic A-pillar blind area measurement system, such as high cost and great impact on the car body structure. Aiming at these problems, a new on-board intelligent A-pillar blind area display system is proposed in this paper. The system obtains the information of the driver's head position and fixation point through a series of detection devices such as visual sensors and line of sight tracking equipment. Combined with the position and structure of the A-pillar, the system intelligently adjusts the display screen covered on the A-pillar to approximately achieve the effect of making the A-pillar transparent to the driver, so as to effectively reduce the probability of traffic accidents caused by the blind area of the A-pillar. References | Related Articles | Metrics

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Research on Electro-hydraulic Servo Control System Based on DSP LUO Changcai 2023, 48(4): 48-54.  DOI: 10.16638/j.cnki.1671-7988.2023.04.010 Abstract ( )   PDF (2111KB) ( )   The electro-hydraulic servo system is widely used in the test of the whole vehicle and its parts. The control precision and dynamic response of the hydraulic servo control system are extremely demanding in the test of the automobile and its parts, especially in the fatigue test and road simulation test. Most automobile manufacturers mainly use imported electro-hydraulic servo systems to conduct the stiffness and fatigue tests on automobiles and parts. This market is basically monopolized by foreign company such as Moog, Instron, MTS and other manufacturers, but the equipment is very expensive. According to the current situation, independent research and development of electro-hydraulic servo control system and application to vehicle and parts testing. This paper introduces the detailed scheme of the self-developed electro-hydraulic servo system and combines the test results to show that the self-developed electro-hydraulic servo system can be completely competent with the test requirements of vehicle and component stiffness and fatigue test, realize high-precision static loading and high-response dynamic loading of the test to matching the test requirements; At the same time, this research can provide experience and reference for the follow-up projects. References | Related Articles | Metrics

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Analysis on the Relationship between Clip Joint Performance and Instrument Panel Abnormal Noise LIU Baogong 2023, 48(4): 55-59.  DOI: 10.16638/j.cnki.1671-7988.2023.04.011 Abstract ( )   PDF (1517KB) ( )   At present, with the accumulation of vehicle mileage in most models, the problem of reliability in automobile interior will become increasingly prominent, especially the reliability of instrument panel. The research on the relationship between snap joint performance and instrument panel reliability can effectively prevent the abnormal noise caused by insufficient connection rigidity between different parts of instrument panel. In this paper, based on the problem of abnormal noise collected from high mileage and durable vehicles, combined with the stiffness performance of the actual instrument panel clasp connection, the computer aided engineering (CAE) analysis method is used to analyze the modal, velocity transfer function (VTF) and squeak&rattle (SR) performance of the instrument panel. The accuracy of CAE analysis is verified by comparing with the test results, and it plays a role in predicting the risk of abnormal noise of instrument panel structure. References | Related Articles | Metrics

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Design of Special Vehicle Architecture Based on in-vehicle Ethernet MA Jian 2023, 48(4): 60-64.  DOI: 10.16638/j.cnki.1671-7988.2023.04.012 Abstract ( )   PDF (2115KB) ( )   Special vehicles play a vital role in the automobile industry. Economic development and urban construction require it more intelligent, functional, and integrated with assisted driving technology, which makes the number of nodes, bus loads, and wire harness weights continue to increase. In-vehicle ethernet is becoming widely used in vehicles due to its advantages of faster transmission rate, reduction of wiring harness cost and weight, and meeting needs of next-generation EEA. This paper designs the EEA of special vehicle based on the in-vehicle ethernet. This architecture integrates the upper system into the structure of vehicle, and the upper can serve other electrical components of the vehicle, providing foundation for the improvement of the intelligence level of the special vehicle. References | Related Articles | Metrics

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Circuit Design Based on Vehicle Digital Audio Power Amplifier System HOU Xueyuan 2023, 48(4): 65-69.  DOI: 10.16638/j.cnki.1671-7988.2023.04.013 Abstract ( )   PDF (1204KB) ( )   In order to optimize and upgrade the vehicle audio technology, a vehicle audio power amplifier circuit based on the automotive audio bus (A2B) vehicle audio bus is designed and implemented. The A2B is used to realize the functions of digital audio input, sampling, processing and digital to analog conversion of the power amplifier output to drive speakers to play audio. The design uses A2B linear topology, digital audio input signal reception, sampling, multi-channel audio analog output functions. While the audio performance is improved, A2B uses fewer cables, reducing the weight and complexity of the system and cables, providing simple and convenient vehicle audio design, and has the versatility and scalability of digital audio power amplifier. References | Related Articles | Metrics

Testing and Experiment

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Analysis of the Influence of Soft and Hard Connection of Subframe on the Comfort of the Whole Vehicle GAO Shenghui 2023, 48(4): 70-74.  DOI: 10.16638/j.cnki.1671-7988.2023.04.014 Abstract ( )   PDF (1892KB) ( )   There are two schemes in this paper including the subframe soft connection with bush and the hard connection with machining iron instead of bush. According to the soft and hard connection of subframe, the tests of ride comfort and road noise are carried out in a test field. The root mean square of weighted acceleration on random road and the effective value of four-wheel impact vibration on pulse road are taken as evaluation indexes. The influence of soft and hard connection of subframe on the comfort of the whole vehicle is analyzed. The result shows that the soft and hard connection of subframe has little influence on the overall ride comfort of the vehicle, but the interior noise of soft connection is better than that of hard connection. References | Related Articles | Metrics

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Numerical Simulation of Internal Flow Characteristics of Multistage Hydraulic Turbine under Transient Conditions ZHANG Li 2023, 48(4): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2023.04.015 Abstract ( )   PDF (1357KB) ( )   In order to study the internal flow characteristics of a multistage hydraulic turbine under transient conditions, a two-stage centrifugal pump reversing hydraulic turbine is taken as the research object, and large eddy simulation turbulence model considering the dynamic sublattice stress mode of nonlinear velocity gradient and helix is constructed, considering the nonlinear velocity gradient and helicity, construct the dynamic subgrid stress mode of large vortex turbulence model, the simulation of the variation of the instantaneous pressure pulse, and analyze the transient condition. The results show that under transient conditions, flow transients can cause sudden changes in pressure pulsation of various components inside the hydraulic turbine, and the sudden pressure intensity far exceeds the amplitude of the pressure pulsation of the components inside the hydraulic turbine itself, in which the inlet chamber is most affected by the flow transient, and the impeller is relatively less affected by the flow transient. When the hydraulic turbine is under transient conditions, the velocity streamline distribution of the inlet chamber is more uniform, and the velocity streamline distribution at the impeller becomes relatively uniform, but the velocity streamline distribution at the interstage guide vanes and the outlet chamber is relatively chaotic where are more vortices. The research results will provide a theoretical basis for the improvement of hydraulic turbine structure in the fields of hydrogen energy storage of new energy vehicles and petrochemical industry. References | Related Articles | Metrics

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Modeling and Control of Automobile Braking Comfort ZHAO Mingqiang 2023, 48(4): 80-85.  DOI: 10.16638/j.cnki.1671-7988.2023.04.016 Abstract ( )   PDF (1281KB) ( )   The main factor that affects the comfort of automobile braking is the pitching vibration of automobile under braking condition, and the pitching of automobile braking is affected by the suspension and braking force. Through the MATLAB software establishes the automobile braking pitch model, simulates the automobile output under the braking input, and simplifies the model reasonably, finds the mathematical relationship between the pitch angle and the braking force, and reduces the braking force to reduce the pitch vibration on the premise of ensuring the braking performance in this paper. According to the analysis of simulation results, the braking pitch is divided into three periods, before and in the middle period of braking, the distribution coefficient of braking force is adjusted to reduce the pitching angle, in the later period of braking, the linear quadratic regulator (LQR) wireless time state adjuster is designed to find a way to adjust the braking force, optimize the pitching angle of the automobile, eliminate the rebound phenomenon of braking, and improve the comfort of the automobile under the braking condition, making this paper has practical engineering significance. References | Related Articles | Metrics

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Brake Noise Analysis of an Automobile Disc Brake HE Daicheng 2023, 48(4): 86-89.  DOI: 10.16638/j.cnki.1671-7988.2023.04.017 Abstract ( )   PDF (1832KB) ( )   Based on the complex eigenvalue method, the finite element simulation model for the brake noise analysis of an automobile disc brake is established in this paper. The brake noise is analyzed from the simulation results of frequency, modal shape, negative damping ratio, modal participation coefficient and modal strain energy, which provides a theoretical basis for noise, vibration and harshness (NVH) development of automobile disc brake system. The results show that the possibility of braking noise of the automobile disc brake system is the greatest near 8 337 Hz. At 8 337 Hz, the real part of the complex eigenvalue is the maximum of 45.5, the negative damping ratio is the minimum of –0.545 6%, the participation coefficient in Z direction is the maximum, the strain energy ratio of the brake disc and the brake pad is large, and the unstable mode is mainly caused by the modal coupling between the brake disc and the brake pad. References | Related Articles | Metrics

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Analysis and Improvement of Inner Wheel Difference in Right Turn of A-double Vehicles GONG Changwei 2023, 48(4): 90-95.  DOI: 10.16638/j.cnki.1671-7988.2023.04.018 Abstract ( )   PDF (1716KB) ( )   As the vehicle component units of a-double vehicles are many and the body is long, its one trailer, two trailer rear wheels and the front wheels of the tractor car will produce internal wheel difference during the right turn, resulting in the overall motion trajectory of the vehicle shifting to the inner side of the curve, which will cause safety threat to the pedestrians and vehicles on the inner side of the curve. In view of this, this paper establishes a dual-track kinematic model of a-double vehicles based on the kinematic theory of multi-body system, derives the motion equation of the vehicle right turn and uses MATLAB software to calculate and simulate the motion trajectory of each wheel; through active steering control of the rear axle of one trailer and two trailers, the inner wheel difference and the change of the motion trajectory of each wheel during the vehicle right turn are analyzed. The results show that the right turn of the a-double vehicles will produce a large internal wheel difference and there is a tail amplification effect, the closer the wheels to the rear of the vehicle and the greater the trajectory difference between the front wheels of the tractor, the appropriate active steering control of the rear axle of the first trailer and the second trailer can effectively reduce the internal wheel difference of the a-double vehicles and improve the driving safety of the vehicle. References | Related Articles | Metrics

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Comparative Study and Discussion of Light Vehicle Emission Laboratory QIU Zhengguang 2023, 48(4): 96-100.  DOI: 10.16638/j.cnki.1671-7988.2023.04.019 Abstract ( )   PDF (1119KB) ( )   Laboratory comparison is the organization, implementation and evaluation of tests carried out by two or more laboratories on the same or similar test items according to predetermined conditions. It is inevitable to produce errors in the process of light vehicle emission testing, but the difference in emission testing between laboratories can be controlled in an acceptable range through the comparison test between laboratories. In this paper, three light vehicle emission laboratories LAB1, LAB2 and LAB3 are taken as examples. Taking the experimental results of national VI ambient temperature emission test and national VI fuel consumption test in three laboratories as examples, the consistency and accuracy of the tests in each laboratory are analyzed by statistical method, which has guiding significance for the subsequent laboratory comparison study. References | Related Articles | Metrics

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The Analysis of Cleaning Performance of Brush Filament Based on ABAQUS LIN Yu 2023, 48(4): 101-106.  DOI: 10.16638/j.cnki.1671-7988.2023.04.020 Abstract ( )   PDF (1191KB) ( )   Using ABAQUS to set up the contact model of the brush filament and garbage particle, analysing cleaning performance of brush filament. It can be learned that the changing rule of the cleaning force on the horizontal direction and vertical direction, and the torque along the motor direction of the particle. After that, the paper defines the critical coefficient of friction, and simulates under different touchdown depths, the result shows that the best touchdown depth value of brush filament is 60 mm, it will be helpful to improve cleaning performance. References | Related Articles | Metrics

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Analysis of Co-simulation of Semi-active Suspension Based on PID Controller YANG Huiyong 2023, 48(4): 107-111.  DOI: 10.16638/j.cnki.1671-7988.2023.04.021 Abstract ( )   PDF (1418KB) ( )   In order to improve the performance of passive suspension and the ride comfort of vehicle, this paper uses ADAMS and Simulink co-simulation method to study the 2-dOF semi-active suspension based on proportion integration differentiation (PID) controller. The dynamic simulation model of 2-dOF semi-active suspension was established in ADAMS and output to Simulink by “Control” module. In Simulink, class B road models at different speeds are generated by filtering white noise method and PID controller is adopted, the sprung mass acceleration and active control force are taken as the input and output of the controller respectively. The time domain characteristics of the vertical acceleration, the dynamic stroke of the suspension and the dynamic load of the wheel are obtained and analyzed. The simulation results show that the semi-active suspension with PID controller can significantly improve the vertical acceleration and ride comfort at different speed stages without deteriorating the stability and safety. Meanwhile, the co-simulation greatly simplifies the modeling process and makes the simulation more intuitive. References | Related Articles | Metrics

Process and Equipment

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Design of Special Fixture for Gear Shaping of Steering Gear Rocker Shaft CHEN Chuang 2023, 48(4): 112-116.  DOI: 10.16638/j.cnki.1671-7988.2023.04.022 Abstract ( )   PDF (1458KB) ( )   In view of the complicated structure of rocker arm shaft of steering gear, the problem of low precision and low efficiency of manual positioning and clamping during gear shaper machining of sector teeth, the positioning reference is selected reasonably and the special fixture for the numerical control gear shaper machine is designed. Adopting spring collet centering clamping mechanism and using hydraulic cylinder as clamping power source, the production efficiency and automation level are improved. By changing the spring collet and cone sleeve, different types of rocker shaft clamping requirements can be adapted to achieve group machining. References | Related Articles | Metrics

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Brief Introduction of the Design and Modal Analysis of Instrument Panel CUI Jinli 2023, 48(4): 117-120.  DOI: 10.16638/j.cnki.1671-7988.2023.04.023 Abstract ( )   PDF (1619KB) ( )   The instrument panel is the most complex system of automobile interior trim, its design is one of the judgment bases for the success of automobile interior trim development. This paper briefly summarizes two commonly used instrument panels, and focuses on the advantages and disadvantages of different manufacturing processes of soft instrument panels. Due to the large number of matching parts around the instrument panel, this paper focuses on the matching design requirements of the instrument panel with the A-pillar upper trim, front windshield, and front wall sheet metal, so as to provide design reference for subsequent models and increase product competitiveness. Using the commonly finite element simulation software Hypermesh and Abaqus to conduct modal analysis on the instrument panel to verify the rationality of the design and avoid additional mold repair costs due to abnormal noise in the instrument panel area during the subsequent part trial production. References | Related Articles | Metrics

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Application and Problems of Laser Welding Technology in Automobile Industry LIU Libo 2023, 48(4): 121-124.  DOI: 10.16638/j.cnki.1671-7988.2023.04.024 Abstract ( )   PDF (1568KB) ( )   Laser welding is widely used in automobile manufacturing. It has the advantages of fast welding speed, beautiful welding seam, small welding deformation, high precision, good welding quality, and can weld metals with high melting point and difficult welding. At the same time, it also has the advantages of high instantaneous welding heat, high cost, complex process and so on. According to several laser welding defects that actually occurred in the company's production, from the perspective of welding tooling and parts matching, this paper analyzes several defects respectively, puts forward improvement suggestions, and also verifies the effectiveness of the measures in practice. References | Related Articles | Metrics

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Analysis of Cracking Problem of Automobile TPE Door Sealing Strips Joint in Real Vehicles ZOU Yufeng 2023, 48(4): 125-130.  DOI: 10.16638/j.cnki.1671-7988.2023.04.025 Abstract ( )   PDF (4595KB) ( )   In order to analyze the reasons for the cracking of the thermo plastic elastomer (TPE) door sealing strips joint in real vehicles, the paper investigated the cracking of the door sealing strips joint through the three aspects:the joint strength of the door sealing strips itself, thermal expansion, contraction, and external force environment. In terms of the door sealing strips joint strength, the tensile test of the joint exposure and joint strength was constructed. In terms of thermal expansion and cold contraction, the high and low temperature cycle experiment of the door sealing strips joint was constructed. In terms of the external force of the door sealing strips joint, the real vehicle door sealing strips joint cutting, the cross section of the door sealing strips joint and the force analysis of the door sealing strips joint was constructed. Comprehensively analyze the root cause of the cracking of the door sealing strips joint. Combined with the experimental results of four aspects, including the angle exposure test, the joint strength test, the high and low temperature cycle test, and the external force analysis of the door sealing strips joint, the root cause of the joint cracking of the door sealing strips is the abnormal force of the door sealing strips joint, and the countermeasures and scheme verification are carried out for the root cause. Guiding directions and solutions are given for the subsequent cracking of the door sealing strips joint in real vehicles. References | Related Articles | Metrics

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Process Optimization of Multi-axis EC Tightening Machine Tightening Parameters ZUO Zhiqiang 2023, 48(4): 131-136.  DOI: 10.16638/j.cnki.1671-7988.2023.04.026 Abstract ( )   PDF (2295KB) ( )   Thread connection is a common way of connecting parts in the process of automobile assembling and adjusting. With the gradual improvement of enterprise intelligent automation level, automatic tightening machine has been widely used in the production line, at the same time the tightening quality of tightening machine has become the key to product quality assurance. This paper optimizes the process parameters of the multi-axis electric servo control (EC) tightening machine through the process investigation, process analysis, rectification and verification of the screw thread failure mode in the tightening process, the consistency of the tightening quality and the tightening result is ensured. References | Related Articles | Metrics

Use and Maintenance

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Analysis of Fault Diagnosis Cases of Electric Loader Unable to Power on High Voltage WEN Jie 2023, 48(4): 137-141.  DOI: 10.16638/j.cnki.1671-7988.2023.04.027 Abstract ( )   PDF (1773KB) ( )   The electric loader uses electric drive, through the high voltage power battery to work motor, walking motor, air conditioning and other high voltage electrical equipment power supply. Electric loader has the advantages of low emission pollution, low working noise, has been gradually applied to shovel soil, sand and other loose materials engineering field. The failure of the electric loader to power on will cause the high voltage equipment such as the working motor and the walking motor to fail to work. This article uses an example of the electric loader which cannot be powered on in engineering operations, analyzes the fault detection process in detail, and conducts failure in combination with the circuit. Finally, the location of the insulation failure was found and relevant suggestions on the design of the electric loader were given. References | Related Articles | Metrics

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Baojun 510 Car Keyless Entry and One-button Start System Fault Diagnosis and Removal WEI Yaohua 2023, 48(4): 142-145.  DOI: 10.16638/j.cnki.1671-7988.2023.04.028 Abstract ( )   PDF (1744KB) ( )   With the development of automobile electronic technology, the application of keyless entry and one-button start system in automobile is more and more widely, which plays a very good role in improving the safety performance of vehicle and the convenience of driver using vehicle, at the same time, it also puts forward higher technical requirements for automobile maintenance personnel. This paper systematically explains the structure and principle of the keyless entry and one-key start system of Baojun 510 automobile, and combines the analysis of the failure cases with the theory and practice, and then help the car maintenance personnel to better master the keyless entry and one-button start system fault diagnosis and removal methods, but also for vocational college teachers this part of the content of the teaching provides a reference. References | Related Articles | Metrics

Automobile Education

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The Construction and Implementation of the "Post Course Competition Certificate" Curriculum System for New Energy Vehicle Technology Professional Group in Higher Vocational Colleges under 1+X Certificate System ZHANG Jingwen 2023, 48(4): 146-150.  DOI: 10.16638/j.cnki.1671-7988.2023.04.029 Abstract ( )   PDF (1004KB) ( )   The fast development of the new energy vehicle industry has brought huge demand for talents, which brings new challenges to the development of new energy vehicle technology professional group. The continuous update of industry-related positions puts forward higher requirements for comprehensive talents. This paper expounds the construction and implementation of the "post course competition certificate" curriculum system of new energy vehicle technology professional group in higher vocational colleges under 1+X certificate system from three dimensions: curriculum system construction, teaching materials and course resources construction, and practical teaching system construction. It provides a new case for the reform of professional group education and teaching in higher vocational colleges. References | Related Articles | Metrics

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Research and Practice on the Integration of Innovation Methods Integrated into Electrical and Electronic Courses ZHANG Bofeng 2023, 48(4): 151-155.  DOI: 10.16638/j.cnki.1671-7988.2023.04.030 Abstract ( )   PDF (1121KB) ( )   In order to carry out innovative education and curriculum ideological and political teaching, this paper puts forward the top-level design as the leading, many courses division of labor cooperative education, different courses undertake different educational objectives. According to the ideological and political education goal of the course, this paper integrates the course of automobile electrician and electronic technology with innovative methods, so as to realize the ideological and political teaching of the course. The study of innovative methods is regarded as one of the main objectives of the course of automotive electrical and electronic technology, learning innovative methods while learning professional knowledge, using innovative methods to guide professional knowledge learning, using professional knowledge to carry out innovative practice, so as to achieve the cultivation of students' innovative ability. References | Related Articles | Metrics

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Research on the Routine of "The Three Educational Elements" Reforming in Automotive Manufacturing under the Background of Intelligent Manufacturing TAN Yanwei 2023, 48(4): 156-159.  DOI: 10.16638/j.cnki.1671-7988.2023.04.031 Abstract ( )   PDF (963KB) ( )   With the proposal of "Made in China 2025", the intelligent automobile manufacturing industry has become a new development trend, and more and more simple and repetitive work is gradually replaced by machines. To some extent, replacing manual work with robots can significantly reduce the dependence of automobile manufacturing industry on traditional labor and improve production efficiency. For automotive manufacturing and testing technology majors in higher vocational colleges, which train talents for front-line positions in automobile enterprises, it is imperative to implement the reform of "the three educational elements" in order to ensure that the students are not eliminated and can quickly adapt to the current new situation of the automobile industry. This paper takes "the three educational elements" reform of automobile manufacturing major as the main research object, analyzes the challenges facing automobile manufacturing major under the current intelligent manufacturing environment, points out the necessity of "the three educational elements" reform, discusses from the three aspects of teachers, teaching materials, teaching methods and puts forward specific reform measures, in order to comprehensively improve the comprehensive vocational ability of students and cultivate high-quality technical and skilled personnel. Provide the foundation for changing trends in the automotive industry. References | Related Articles | Metrics

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Discussion on the Construction of Engineering Thermodynamics Course Integrating the Ideological and Political Elements JU Hongling 2023, 48(4): 160-163.  DOI: 10.16638/j.cnki.1671-7988.2023.04.032 Abstract ( )   PDF (1041KB) ( )   Curriculum ideological and political education are implicit moral education, which can have a profound impact on students' value orientation, ideology and behavior. Taking "Engineering Thermodynamics" as the carrier, the ideological and political elements of curriculum such as personal value orientation, patriotic feelings, national sense of responsibility and mission, professional ethics, selfless dedication and craftsmanship spirits were integrated into the curriculum content, which realize the integration connection of invisible curriculum ideological and political elements and explicit curriculum content. The online and offline mixed teaching mode of "MOOC + flipped classroom" was adopted, the process assessment for the curriculum ideology and politics of the curriculum was added, and the course evaluation system and incentive mechanism were improved to realize the construction of the engineering thermodynamics curriculum system integrated into the ideological and political elements of the curriculum. On the basis of enabling students to understand the course background and application prospects, the course system can deepen the study of theoretical knowledge, solve practical engineering problems, and cultivate students' feelings of home and country and practice the professional ethics and skills of energy saving and high efficiency, low carbon and environmental protection. References | Related Articles | Metrics

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Application of Rain Classroom Intelligent Teaching Tool in Automobile Operation Guarantee Technology Course LI Yanxiao 2023, 48(4): 164-168.  DOI: 10.16638/j.cnki.1671-7988.2023.04.033 Abstract ( )   PDF (1403KB) ( )   Automobile operation guarantee technology is a theoretical and practical course, which requires students to use professional theory knowledge comprehensively to analyze and solve practical engineering problems. In view of some problems existing in the teaching process of the course, this paper practices the mixed teaching mode based on the intelligent teaching tool of rain classroom. The results of practice show that the intelligent teaching tool of rain classroom improves the classroom teaching effect, cultivates students' ability of independent learning, professional communication and engineering problem analysis. The research has a reference significance for the teaching of practical courses. References | Related Articles | Metrics

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Current Situation and Teaching Reflection of Entrepreneurship Education for Automobile Major in Higher Vocational Colleges FAN Zhenshan 2023, 48(4): 169-173.  DOI: 10.16638/j.cnki.1671-7988.2023.04.034 Abstract ( )   PDF (1204KB) ( )   In order to better promote the development of entrepreneurship education for automobile major, the current situation of entrepreneurship education for automobile major in higher vocational colleges was investigated with questionnaire and on-site interviews methods, and the results were counted, combining the basic elements of entrepreneurship education, the current situation of entrepreneurship education for automobile majors in higher vocational colleges were analyzed. Combining experience of entrepreneurship education in higher vocational colleges, the teaching reflection from strengthening pertinence guidance, advancing education system reform, carrying out systematic entrepreneurship education, setting up an entrepreneurship practice exchange platform for higher vocational students, jointing with the needs of society and enterprises, and constructing a teaching practice mode of entrepreneurship education for automobile major in higher vocational colleges that meeting local requirements and having own characteristics is put forward. References | Related Articles | Metrics

Standards Regulations Management

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Vehicle Competitiveness Evaluation Method Based on Customer Needs GAO Rui 2023, 48(4): 174-178.  DOI: 10.16638/j.cnki.1671-7988.2023.04.035 Abstract ( )   PDF (1392KB) ( )   Accurately positioning the competitiveness level of commodity vehicles is conducive to the company's targeted product improvement, and accurately identifying and meeting customer needs is the key to the competitiveness of commodity vehicles. This paper provides a vehicle competitiveness evaluation system for heavy-duty trucks based on the actual use needs of customers, adopts a combination of subjective and objective evaluation methods, clarifies the main concerns of eight customers through research and big data analysis, and outputs the vehicle evaluation results and competitiveness. Through the actual measurement of the three trucks, the overall competitiveness of the J brand truck is the strongest, which is significantly better than the other two trucks in terms of economy and reliability, and the results prove that this method can provide an effective basis for the evaluation of the competitiveness of the whole vehicle. References | Related Articles | Metrics

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Severity Analysis of Vehicle Traffic Accidents Based on XGBoost and SHAP CHEN Kailiang 2023, 48(4): 179-185.  DOI: 10.16638/j.cnki.1671-7988.2023.04.036 Abstract ( )   PDF (1892KB) ( )   In order to study the significant factors affecting the severity of four-wheeled vehicle traffic accidents, and to grasp their occurrence characteristics and regularities, 2 966 four-wheeled vehicle accidents in the China in-depth acciddent study (CIDAS) database are modeled to include the 19 factors including people-vehicle-road- environment are used as input and the accident result is used as output. In the research, an evaluation system including accuracy, precision, recall, F-1 score are introduced, and the XGBoost model is compared with LightGBM, random forest and CatBoost models side by side, which proved its excellent classification performance. In addition, SHAP is used to visually analyze the model to explore the influence of various factors on the severity of the accident. The results show that, for minor injury/serious injury/death, the most critical influencing factors are collision type, personnel category, and collision type. In order to avoid the occurrence of fatal accidents, we can pay more attention to and prevent unilateral collisions of passengers/trucks, and the accident is characterized by starting, running off course under the high speed limit road, colliding with the target vehicle, or hitting an obstacle. And should pay attention to the slack psychology of drivers who drive on the 30～60 km/h speed limit road. References | Related Articles | Metrics

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Interpretation and Discussion of GB/T 20076—2021 Measurement Methods of Maximum Torque and Maximum Net Power of Engines for Motorcycles and Mopeds MAO Wengang 2023, 48(4): 186-189.  DOI: 10.16638/j.cnki.1671-7988.2023.04.037 Abstract ( )   PDF (1177KB) ( )   The maximum torque and maximum net power of motorcycle engine are the only test items of engine products in the motorcycle new product announcement inspection and 3C compulsory certification, this paper analyses and interprets in detail the differences between Measurement Methods of Maximum Torque and Maximum Net Power of Engines for Motorcycles and Mopeds (GB/T 20076—2021) the standard GB/T 20076—2006, and discusses the relevant technical requirements in the new version of the standard, so as to further understand the technical requirements, and to facilitate a more comprehensive and systematic mastery and application of the new version of the standard for testing institutions and enterprise technical personnel. References | Related Articles | Metrics

Overview

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Research Progress of Engine Hood Hinge Based on Pedestrian Protection ZHOU Chaojun 2023, 48(4): 190-195.  DOI: 10.16638/j.cnki.1671-7988.2023.04.038 Abstract ( )   PDF (1152KB) ( )   As a concentrated area of head impact, the hinge of the vehicle hood is the hard point inside the hood, and its failure will cause a danger to drivers, passengers and pedestrians. Based on the overview of the development of pedestrian protection, this paper introduces the research present situation of hood hinge based on pedestrian protection in detail from the simulation analysis and test and structural design of hood hinge. The results show that the simulation analysis and experimental research of hood hinge are carried out by the method of simulation combined with test. The structural design of hood hinge presents four types: active, crush, structural optimization and foldable variant. Finally, the development direction of hood hinge is prospected. References | Related Articles | Metrics

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On the Development Trend of Low Voltage Power Distribution System under the New Modernizations of the Vehicle LIU Cheng 2023, 48(4): 196-200.  DOI: 10.16638/j.cnki.1671-7988.2023.04.039 Abstract ( )   PDF (1461KB) ( )   With the rapid development of vehicle intelligence, large increase in on-board functions , the whole vehicle harness system is becoming more and more complex, it not only increases the weight of the whole vehicle, but also makes the power distribution system of the whole vehicle more complex. In order to meet the functional requirements of the whole vehicle, ensure the safety of harness system, the fuse box needs to be developed intelligently, improve the reliability and safety level of the whole vehicle harness power distribution system, save wire circuit, use aluminum wires to reduce the weight of the whole vehicle. References | Related Articles | Metrics

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Research Progress of Automatic Emergency Braking Technology for Commercial Vehicles HE Tong 2023, 48(4): 201-204.  DOI: 10.16638/j.cnki.1671-7988.2023.04.040 Abstract ( )   PDF (1145KB) ( )   With the development of active safety technology, automatic emergency braking (AEB) technology can actively intervene in the braking system before vehicle collision to slow down or stop the vehicle, so as to ensure the safety of personnel and property. This paper combs and analyzes the test and evaluation regulations of commercial vehicle AEB at home and abroad, summarizes the performance level and technical achievements of commercial vehicle AEB, summarizes the research progress of commercial vehicle AEB technology, and looks forward to its key research direction in the future. References | Related Articles | Metrics