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15 August 2022, Volume 47 Issue 15 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Simulation and Analysis of Energy Consumption of a Range Extender Electric Vehicle GU Jin 2022, 47(15): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2022.015.001 Abstract ( )   PDF (1359KB) ( )   In order to study the current energy consumption status of a range extender electric vehicle, this paper shows the energy consumption conditions and testing methods of the range extender electric vehicle. Based on AVL Cruise software for modeling and simulation, and a relatively efficient and accurate simulation model architecture is proposed to offer dynamic and economic simulation reference in range extend electric vehicle development. After data comparison to confirm the effectiveness of the model, finally, the deviation between the simulated fuel consumption in charge sustainning (CS) mode and the actual test results is less than 1%, which reached the expection and the simulation model can be used in the coming development. References | Related Articles | Metrics

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Comprehensive Competitiveness Evaluation of New Energy Automobile Industry in Chengdu ZHOU Yijun 2022, 47(15): 6-11.  DOI: 10.16638/j.cnki.1671-7988.2022.015.002 Abstract ( )   PDF (832KB) ( )   In recent years, the new energy automobile industry has become a nationl strategy, and local cities have also taken the lead in deploying the new energy automobile industry, and industry competition among cities has intensified. This article takes Chengdu’s new energy automobile industry as the research object, uses Porter’s “diamond” model theory and the characteristics of the new energy automobile industry to construct a “new diamond model” to determine the competitiveness evaluation index of the new energy automobile industry, and then adopts the combina tion evaluation method of gray correlation degree and ideal solution calculates the relative closeness of each evaluation index between Chengdu and the benchmark cities (Shanghai, Beijing, Wuhan, Chongqing), and compares and analyzes the gap between Chengdu and the benchmark cities. For the benchmark gap, this article puts forward relevant suggestions on improving the construction of charging infrastructure, increasing the promotion of new energy vehicles, improving technological innovation capabilities, and improving the parts and components industry supporting policies and industrial support policies. References | Related Articles | Metrics

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Analysis of Correlation between Steering Transmission System and Frame System of a New Energy Light Truck XIANG Dongdong 2022, 47(15): 12-16.  DOI: 10.16638/j.cnki.1671-7988.2022.015.003 Abstract ( )   PDF (1715KB) ( )   Light trucks and heavy trucks belong to commercial vehicles, both have similar structures of steering drive system and frame system, but their design concepts are not the same, resulting in the specific structure and design methods are also different. In a new energy vehicle chassis problem of local stress exceeds bid as a starting point, through the design check list and competing goods on the way to troubleshoot the cause of the problem, finally lock reason and spawned new energy vehicle steering drive system and frame system correlation design concept, for the following product design and design problem analysis provides the effective support. References | Related Articles | Metrics

Intelligent Connected Vehicle

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The Algorithm of Actuator Fault Redundancy for Autonomous Vehicles HUANG Jiangen 2022, 47(15): 17-22.  DOI: 10.16638/j.cnki.1671-7988.2022.015.004 Abstract ( )   PDF (1319KB) ( )   This paper proposes a redundant strategy for actuator failures in autonomous vehicles, including steering and braking actuator fault. Firstly, the unscented Kalman filter is used to estimate the state of the steering angle input of the command layer, and judge whether the actuator is working normally according to the deviation of the estimated state and the actual state. After determining the steering failure, the direct yaw moment control is adopted to perform the redundant steering by ESC. In addition, after the brake failure is determined, the desired pressure is obtained through the MAP method and ESC is used to achieve braking redundancy. The simulation test results show that actuator faults can be diagnosed timely and effectively, and corresponding functional redundancy can be realized to ensure vehicle driving safety. References | Related Articles | Metrics

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Low Cost T-box Multi-Information Combination Navigation LI Zexi 2022, 47(15): 23-27.  DOI: 10.16638/j.cnki.1671-7988.2022.015.005 Abstract ( )   PDF (792KB) ( )   The vehicle on-board remote equipment T-box has the functions of vehicle remote diagnosis and monitoring. The accuracy of the low-cost T-box positioning receiving module is low, and it is susceptible to high-rise or elevated buildings in the city. In order to solve the locating problem of low cost locating module in T-box, a method of improving navigation precision by removing high noise data points and multiple data fusion is proposed. T-box is equipped with MIMU inertial module and OBD module, acquisition of inertial data and vehicle speed. Least squares method to fit the route of the car to remove the original positioning data of high noise latitude and longitude data points. Finally, with the car speed and inertial data to expand Karlman filter to obtain new longitude and latitude data fusion, compared with the high-precision positioning data, the method can effectively improve the low-cost T-box positioning accuracy. References | Related Articles | Metrics

Design and Research

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Design and Optimization of a New Baja Racing Car Frame YAN Yuchen 2022, 47(15): 28-32.  DOI: 10.16638/j.cnki.1671-7988.2022.015.006 Abstract ( )   PDF (1256KB) ( )   In this study, this paper analyzed and designed the frame of the Baja race car. Firstly, we used CATIA software for 3D modeling and finite element method, and designed different working conditions for various conditions in the Baja race to test and analyze the stress and deformation of the frame, analyze the factors that affect the frame, and verify whether the frame can meet the load and performance requirements. The frame is designed to meet the basic requirements of the race car. To meet the requirements of the competition, ANSYS software was used to simulate the possible deformation and stress distribution of the Baja car on the way to the competition by performing bending strength analysis, torsional strength analysis, lateral acceleration analysis and longitudinal acceleration analysis. Through the calculation and analysis, and by comparing the changes of the frame data before and after the optimization, a frame with more compact and reasonable design, stable performance, high reliability and meeting the requirements of the competition is obtained,which proves the feasibility of this optimization scheme and provides an idea for the optimization design of the Baja car frame. References | Related Articles | Metrics

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Strategy on Hill Start Assistance Control for AMT Vehicles LI Xuan 2022, 47(15): 33-36.  DOI: 10.16638/j.cnki.1671-7988.2022.015.007 Abstract ( )   PDF (1538KB) ( )   This paper is aiming at the hill start assist control research for automated mechanical transmission light vehicle with the hill start assist system. According to the working characteristics of the hill start assist system, the dynamics of the vehicle launch process on a slope is analyzed. The control strategy of the hill start assist for automated mechanical transmission vehicles is carried out and the control software is designed. Finally the vehicle is tested on different slopes. The test results show that the research method can meet the requirements of automated mechanical transmission vehicle launches on different slopes, and the vehicle launches smoothly on the slopes without slipping. The hill start assist system has strong practicability. References | Related Articles | Metrics

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Analysis and Design Optimization of Cab Door Rain-leaking Problem LIU Qian 2022, 47(15): 37-40.  DOI: 10.16638/j.cnki.1671-7988.2022.015.008 Abstract ( )   PDF (1447KB) ( )   In order to solve the problem of rain leakage of cab door, this paper analyses the main influencing factors of sealing property and the main features of weather strip, focuses on optimizing the structure of weather strip. The compression is improved by changing the structure of cross section of weather strip from single cavity to double cavities. The clamping force is improved by adding pawls. Through adding foam bars at the position which the curvature changes intensely, the contact area between the strip and door is increased, the rebound force is increased. Through adding the molded corners, the strip and mounting edge are fitting well, the accuracy of mounting position is guaranteed. Through the above methods, the sealing property of the cab door is increased, which is proved by rain test. Therefore, optimizing the structure of weather strip can effectively improve the sealing property of the cab and reduce the production cost. References | Related Articles | Metrics

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Composite Tailgate Sled Test Analysis and Structure Optimization ZHANG Shaowei 2022, 47(15): 41-47.  DOI: 10.16638/j.cnki.1671-7988.2022.015.009 Abstract ( )   PDF (2333KB) ( )   In the structural design of the automobile tailgate, the tailgate door lock and its retainer should meet the structural functionality and integrity under high-speed crash load in the sled test. This paper takes the composite tailgate as the research object, focuses on the high-speed material properties of the composite material, by establishing the finite element simulation analysis model of the composite tailgate sled test. The accuracy of the simulation model of the composite tailgate sled was validated to the test results, and the fracture performance of the composite tailgate, especially the tailgate lock and its retainer under high strain rate was analyzed under high-speed conditions. Finally, based on the accurate simulation analysis model of the tailgate sled test, taking into account the process feasibility of composite materials, an optimization scheme to strengthen the weak area of the composite tailgate is proposed, and the reliability of the optimization scheme was also verified by experiments. The finite element simulation analysis and optimization method using the sled test described in this paper can efficiently and accurately solve the problem of local cracking of the composite tailgate in the sled test. References | Related Articles | Metrics

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Vehicle Suspension Design Based on Six Degree of Freedom Decoupling Analysis GU Hainan 2022, 47(15): 48-51.  DOI: 10.16638/j.cnki.1671-7988.2022.015.010 Abstract ( )   PDF (1156KB) ( )   With the progress of society and the popularization of vehicles, the vibration and comfort of vehicles gets more and more attention from users. Based on the forward design of engine suspension based on the principle of six degrees of freedom decoupling, the natural frequency of powertrain was analyzed and designed, and the basic decoupling of six degrees of freedom in all directions was realized. It not only improves the success rate of one-time development and the control of development cost of the whole vehicle in the development cycle, but also provides theoretical optimization and rectification suggestions for the subsequent actual evaluation and adjustment of the vehicle, and reduces the trial and error rounds in the development process. References | Related Articles | Metrics

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Design of Robot Gripper for Shaft Parts WANG Yatao 2022, 47(15): 52-54.  DOI: 10.16638/j.cnki.1671-7988.2022.015.011 Abstract ( )   PDF (748KB) ( )   In recent years, robot technology has developed rapidly, and its application in the field of intelligent manufacturing has become wider and wider. This paper introduces the design of the robot gripper used for the grasping and handling of shaft parts under the conditions of factory automation. On the basis of analyzing and summarizing the functional requirements and system composition of the robot gripper, the main points and methods of the design are put forward. Combined with specific examples of project design, the design of the robot gripper is described in detail from the aspects of functional requirements, system requirements, and mechanical structure design. The application results of the actual project show that the robot gripper has a compact structure and complete functions, and is suitable for the grasping of various shaft parts with different shaft diameters, which provides a reference for the optimal design of the robot gripper for other subsequent projects. References | Related Articles | Metrics

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Mechanism of Axial Deflection of CVT Belt and its Effect on Belt Failure YU Qishun 2022, 47(15): 55-59.  DOI: 10.16638/j.cnki.1671-7988.2022.015.012 Abstract ( )   PDF (1462KB) ( )   Metal belt is the core important part of continuously variable transmission, however, its failure will bring on car power loss, and even personal safety. This paper mainly studies metal belt structure applied in continuously variable transmission gearbox and its working principle. Meanwhile, we study its force analysis during power transfer, formula of axial deviation value generation during ratio changes, the failure process and mechanism of the fracture of metal belt caused by axial deflection are analyzed in detail. Finally, some countermeasures are proposed to reduce the harm of axial deflection by reasonable matching parameters, so as to reduce the fracture risk of continuously variable transmission caused by road load and improve the working reliability of continuously variable transmission. References | Related Articles | Metrics

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Vehicle Width Optimization Based on Sliding Door MPV LI Xiaojun 2022, 47(15): 60-63.  DOI: 10.16638/j.cnki.1671-7988.2022.015.013 Abstract ( )   PDF (1199KB) ( )   This paper studies the optimization of the width of the whole vehicle at the multi purpose vehicles sliding door. The width of the whole vehicle is determined by the layout of the upper body and the layout of the lower body. The influence of the layout of the lower body on the width of the whole vehicle is mainly the size of the tire, the size of the engine and the size of the suspension. When the tire and the engine are fixed, the width of the whole vehicle is adjusted by fine-tuning the suspension size. The influence of the layout of the upper body on the width of the whole vehicle is mainly the size of the riding space, When the riding space is certain, the key point of vehicle width optimization is the sliding door hinge track layout. The sliding door MPV vehicle width optimizes the suspension arm length and sliding door hinge track layout through ADMAS simulation. References | Related Articles | Metrics

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Design of the Radio Frequency Circuit of a Heavy Truck Door and Window Controller WANG Bing 2022, 47(15): 64-68.  DOI: 10.16638/j.cnki.1671-7988.2022.015.014 Abstract ( )   PDF (979KB) ( )   Wireless communication technology has been widely used in the development of remote control keys and tire pressure monitoring systems in the automotive field. After investigation, car wireless remote control keys occasionally have problems such as functional failure, short remote control distance, and unstable performance. Aiming at these problems, this paper designs a radio frequency circuit that can be applied to automotive data communication module. Using FS32K as the core single-chip microcomputer, and based on Infineon's TDA5235 and TDK5110F chips as the system transceiver module. The article elaborates the design principle of the system's software and hardware and the process of antenna modeling and simulation in detail, and the system is tested and verified by the method of joint debugging of software and hardware. The experimental results show that the circuit has the characteristics of strong anti-interference ability, long remote control distance, low power consumption, etc., and can be fully applied to automotive data communication module. References | Related Articles | Metrics

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Packaging and Deployment Technology of the Mechanism Model in Automobile Industry WANG Xingwei 2022, 47(15): 69-76.  DOI: 10.16638/j.cnki.1671-7988.2022.015.015 Abstract ( )   PDF (1113KB) ( )   Industrial App in the automotive industry is gradually being widely used. It is a general trend to provide flexible industrial App products for the automotive industry ecosystem. The core of industrial App products is the industrial mechanism model. In view of the problems that the mechanism model is affected by the diversity of modeling tools, the multi-source of modeling languages and cannot be called uniformly, this paper studies the technical route of unified packaging of mechanism models in multiple languages, which can be applied to the mechanism model developed by JAVA, C#, C++, Python, MATLAB, Mworks and other software tools in the automotive industry. At the same time, the executable program of automatic deployment of multi-source heterogeneous mechanism model is developed and applied. These research results eliminate the barriers between heterogeneous models, open up the data flow and control flow between heterogeneous models, realize the data flow of models, realize the full compatibility of heterogeneous language models, and break through the limitations of traditional mechanism models. Effectively solve the problems of high requirements for developers and low development efficiency of traditional industrial software development methods, and speed up the R&D, promotion and application of industrial App in key industries such as automobiles. References | Related Articles | Metrics

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Analysis and Elimination of Large Vibration Fault of the Steering Wheel of a Light Truck YANG Ming 2022, 47(15): 77-86.  DOI: 10.16638/j.cnki.1671-7988.2022.015.016 Abstract ( )   PDF (2164KB) ( )   The steering wheel vibration large of a light truck at idle speed is studied. Noise, vibration, harshness (NVH) test and analysis were carried out on the whole vehicle, and modal test was carried out on the steering wheel. through tests, this paper searches and finds out the source of the failure, as well as analyzes the failure mechanism. Design several feasible optimization schemes, further test, confirm the effect of each optimization scheme, through the test, find the best optimization scheme. The large vibration of the steering wheel is mainly caused by the natural frequency of about 25 Hz in the upper part of the steering wheel and the resonance at about 800 r/min. Through the verification of different optimization schemes, the optimal scheme is finally determined to lighten the weight of the upper part of the steering wheel, and a light steering wheel that meets the requirements is designed. It provides a reference for the design of light truck steering wheel. References | Related Articles | Metrics

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Design of Automobile Induction Wiper Control System Based on Electrical Control HE Zigang 2022, 47(15): 87-89.  DOI: 10.16638/j.cnki.1671-7988.2022.015.017 Abstract ( )   PDF (848KB) ( )   The automobile industry is developing rapidly in the 21st century. Wipers are the basic equipment of vehicles, and some models still use manual wiper paddles, which makes the driver's attention distracted, resulting in traffic accidents. Therefore, based on the basic knowledge of electrical control, an induction wiper control system is designed to make the wiper automatically adjust according to the rainfall. The principle and working process of common rain sensors are analyzed, and the infrared reflective rain sensor is selected. When the wiper cannot work normally, the locked rotor operation of the wiper motor is increased through software optimization. When the wiper stops working, the return function of the wiper is designed. It provides an idea for the current control mode of automobile wiper. References | Related Articles | Metrics

Testing and Experiment

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Simulation and Structural Optimization of a Vehicle Model Based on 40% Frontal Offset Collision SUN Zhaoyan 2022, 47(15): 90-95.  DOI: 10.16638/j.cnki.1671-7988.2022.015.018 Abstract ( )   PDF (2547KB) ( )   In the development of 40% offset collision simulation of the whole vehicle, in view of the existing method of increasing the strength of sheet metal to achieve structural safety, this paper proposes a structural optimization scheme to improve the collapse mode of the front longitudinal beam. Through the X-direction deformation of the left front longitudinal beam, the first-level collapse becomes the second-level collapse, which achieves the purpose of fully crushing and absorbing energy. In addition, an inductive rib is applied to the left front longitudinal beam to bend it in the Y-direction to increase the Y-direction energy absorption of the body structure and further reduce the collision energy absorbed by the vehicle in the X-direction. After structural enhancement and optimization based on the benchmark simulation model and comparison, the living space of the passenger compartment increased by about 20%, and the deformation of the A-pillar and the seat beam were improved. This kind of structural optimization scheme can be used as an optimization idea in the development of different degrees of offset collision. References | Related Articles | Metrics

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Development and Debugging of the Lane Keeping Assistant System for Passenger Cars ZHU Baoying 2022, 47(15): 96-100.  DOI: 10.16638/j.cnki.1671-7988.2022.015.019 Abstract ( )   PDF (1781KB) ( )   The driver's distraction, carelessness and accidental touch during driving may cause the vehicle to deviate from the lane, which may cause scratch with the vehicles in the adjacent lane and endanger the life safety of drivers and passengers. The lane keeping assistant system can ensure that the vehicle is driving in the middle of the lane, or correct the deviation in time when it detects that the vehicle is about to unconsciously deviate from the lane, which can effectively prevent the occurrence of collision accidents such as scratch. This paper introduces the development process of lane keeping assistant system of passenger car in detail, including the simulation and real vehicle debugging of lane centering control (LCC) and lane departure suppression (LDP). After debugging, the function of lane centering control and lane departure suppression can be used normally, and the developed functions have successfully passed the requirements of the specification GB/T 39323-2020. References | Related Articles | Metrics

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Fuzzy Strategy for the Liquid-cooled Temperature Control System of a Drum Brake ZHAO Kaihui 2022, 47(15): 101-107.  DOI: 10.16638/j.cnki.1671-7988.2022.015.020 Abstract ( )   PDF (1693KB) ( )   In order to overcome all kinds of disadvantages of traditional liquid-cooled temperatureregulated device (TLTD) in the downhill braking process and improving the performances of heavy-duty truck, the brake-heating coupling model is established firstly on the basis of the conservation of energy and the inherent coupling relationship of braking process, then the Liquid-cooled temperature control system (LTCS) is founded which is based on the parallelconnected fuzzy strategies and used to investigate the Liquid-cooled fuzzy control for all drum brakes. Aimed at a certain type of heavy special truck with three axles as a example, the related simulation calculations and the subsequent comparisons between TLTD and LTCS were carried out. The results show that the LTCS can use less water to regulate the temperature reduction of drum brakes well, so the surface of road is still dry because of no cooling water dripping from the outer surface of brake drum to the ground and being freezed. In addition, the amount of loading water of truck is reduced correspondingly. It is concluded that the LTCS improves the performances of truck with good effect. References | Related Articles | Metrics

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Research on Measurement Accuracy of Vehicle Center of Mass WANG Jianan 2022, 47(15): 108-112.  DOI: 10.16638/j.cnki.1671-7988.2022.015.021 Abstract ( )   PDF (1172KB) ( )   There are one or more of the following problems in the vehicle centroid measurement methods (lifting method and pendulum method): during the measurement, the front and rear suspension compression, tire deformation and friction change, etc. They cause the problem that the measurement deviation of centroid in X, Y and Z directions is too large. These deviations will be multiplied and redundant in the design and verification of each module, which will affect project schedule, cost and development cycle. This paper mainly studies how to solve the above problems. By studying the measurement process of current measurement methods, combined with the analysis of the physical structure of the real vehicle, and then comparing the theoretical digital analog data with the real vehicle measurement structure, we summarize the causes of the above problems. We solve the deformation problem of spring and tire in the measurement process by establishing a rigid connection mechanism. A special mechanism is designed to convert the sliding friction of the tire into the rolling friction of the bearing, so as to reduce the problem that the direction of internal friction and reaction force cannot be determined. Through the calibration of the position sensor and inclination measuring instrument on the equipment, the deviation of lifting height and inclination angle in the measurement can be reduced. Through the above measures and methods, the measurement accuracy can be improved. References | Related Articles | Metrics

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Particles Emission Characteristics of Different Particle Size in China VI Diesel Engine LI Jinsong 2022, 47(15): 113-119.  DOI: 10.16638/j.cnki.1671-7988.2022.015.022 Abstract ( )   PDF (1397KB) ( )   Based on the methods of engine test bench, the emission of PN10 (particulate number above 10 nm) and PN23 (particulate number above 23 nm) for a heavy-duty diesel engine that meet the China VI emission standards in the steady state working conditions and the CHINA VI standard cycle tests were simultaneously measured, and the effect of dilution ratio on the measurement results was analyzed. The results show that the emission amount of particles is highly dependent on the carbon accumulation state of the pretreatment, and the change of the dilution ratio will change the distribution of the particle size. Within the initial of the cold start WHTC cycle, the proportion of 10 nm～23 nm fine particles was at the highest level at the beginning of the cycle, because the mixture of fuel and air combustion is insufficient, the emission of PN at first 150 s contributes more than 80% of the entire test. In the WHSC steady cycle test, PN10 and PN23 have basically the same trends under different cycle, and the emission of PN at the the full load corresponding the most economical operating region is small, and deviations from this speed will lead to an increase in PN. References | Related Articles | Metrics

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Simulation Analysis of Stiffness Characteristics and Influencing Factors of Air Spring on a Certain Vehicle DING Dudu 2022, 47(15): 120-123.  DOI: 10.16638/j.cnki.1671-7988.2022.015.023 Abstract ( )   PDF (1236KB) ( )   With a certain model of air spring as the research object, the stiffness characteristics of the membrane air spring are introduced. Based on nonlinear finite element analysis theory the finite element analysis method of air spring is the main factors affecting the stiffness of air spring are analyze, in which Mooney model is used to simulate rubber material and Rebar model is used to simulate cord layer. The results show that increasing the air spring volume leads to the reduction of stiffness, the stiffness increases with the increase of initial pressure, the stiffness increases with the increase of the angle of the capsule cord, the stiffness increases with the increase of piston shape and volume. The volume and initial pressure of air spring have more influence on the stiffness. References | Related Articles | Metrics

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Correlation Analysis on Four-channel Road Simulation Test CHEN Chuanqin 2022, 47(15): 124-127.  DOI: 10.16638/j.cnki.1671-7988.2022.015.024 Abstract ( )   PDF (1265KB) ( )   This paper introduces the four-channel road simulation test and its assessment strength of main vehicle systems. The correlation between bench test and road test is compared and analysed by collecting the acceleration, strain and force of various parts. It helps to effectively identify the problems in the test process, while is true or false. And it provides reliable test data for design. References | Related Articles | Metrics

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The Optimization of Passenger Car Disc Brake Creep Groan Noise GUO Junbo 2022, 47(15): 128-130.  DOI: 10.16638/j.cnki.1671-7988.2022.015.025 Abstract ( )   PDF (1172KB) ( )   This paper mainly focuses on creep groan noise produced by vehicle cold start of disc brake, studied the generation mechanism of groan noise, analyzed the factors affecting passenger car groan noise by fishbone diagram and the solutions to the noise, and reduced passenger car creep groan noise through the pad process optimization, material selection and power system optimization. It provides some guiding significance for the follow-up optimization of passenger cars creep groan noise. References | Related Articles | Metrics

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CMM Model of Hole Group Position without Datum ZHANG Longgang 2022, 47(15): 131-133.  DOI: 10.16638/j.cnki.1671-7988.2022.015.026 Abstract ( )   PDF (1175KB) ( )   The marking of the hole group position degree on the part sometimes appears without a reference, which is in accordance with the requirements of GB/T, but often causes disagreement between the measurer and the designer, resulting in less accurate evaluation. In this paper, a theoretical calculation model of hole group position degree is given based on the least squares method, and then a mounting bracket is used as an example to carry out the actual measurement and evaluation with a CMM, and the results are compared with those of PC-DMIS software to verify the validity of this datum-free hole group position degree measurement and evaluation model. References | Related Articles | Metrics

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Simulation Analysis Method of the Ball Pull-out Force on a Control Arm YU Dongna 2022, 47(15): 134-138.  DOI: 10.16638/j.cnki.1671-7988.2022.015.027 Abstract ( )   PDF (2493KB) ( )   Based on ABAQUS software, the ball pin seat of the control arm which a certain vehicle was simulated with pull-out force. According to the adaptive contact theory, the display dynamics solver was used to simulation verifies that the peak displacement is 8.77 mm when the ultimate pull-out force is 53.1 kN, use which to compare the calculated pull-out force-displacement curve with the bench test curve, the error rate shall be controlled within 5%, and the results met the consistency requirements. The simulation process with stronger pertinence and high precision is summarized, which provides theoretical guidance for the design, testing and experiment verification of the relevant parts. References | Related Articles | Metrics

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Comparison of Body Attachment Dynamic Stiffness Post-processing Method LIU Yang 2022, 47(15): 139-144.  DOI: 10.16638/j.cnki.1671-7988.2022.015.028 Abstract ( )   PDF (1362KB) ( )   Improving the body attachment dynamic stiffness is the main method to obtain excellent Noise,Vibration,Harshness experience. There are four method to calculate average dynamic stiffness, i.e. average method, index method, area method and 1/3 octave method. However, the meaning of four methods is not clear, and engineerings will be confused. In this article, the average dynamic stiffness is rewritten as a function of the dynamic stiffness of each frequency. The mathematical meaning of the average dynamic stiffness is given. Average method is arithmetic mean of dynamic stiffness curve. Index method is geometric average of dynamic stiffness curve. Area method is harmonic average of dynamic stiffness curve. 1/3 Octave method is square average of every dynamic stiffness curve. The body attachment average dynamic stiffness by calculated an example. References | Related Articles | Metrics

Process and Equipment

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Design Requirements for Automobile Harness Layout LIU Cheng 2022, 47(15): 145-150.  DOI: 10.16638/j.cnki.1671-7988.2022.015.029 Abstract ( )   PDF (1671KB) ( )   With the increase of automobile functions, the electrical architecture becomes more complex, and the complexity of the vehicle harness system also increases. The increase of vehicle harness circuits leads to the increase of vehicle harness volume, the thickening of trunk and the hardening of harness. In order to perfectly embed the harness into the vehicle body in a limited space, avoid the harness being squeezed, pulled, and rubbed, and ensure the normal function of the vehicle electrical appliances, the layout of the vehicle harness needs to be designed and studied. By introducing the failure mode of wiring harness layout and combining with the practical wiring harness development experience, a reasonable wiring harness layout development scheme is provided to improve the reliability of wiring harness from the perspective of layout, which can effectively avoid the risk of fire caused by functional failure or short circuit and provide a reference for the layout development of new vehicle wiring harness. References | Related Articles | Metrics

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Analysis of Reliability of Drain Plug of Aluminum Alloy Oil Tank WU Xuefeng 2022, 47(15): 151-155.  DOI: 10.16638/j.cnki.1671-7988.2022.015.030 Abstract ( )   PDF (6245KB) ( )   The aluminum alloy fuel tank used by a heavy-duty truck has been exposed to the problems of cracking at the drain plug boss and leaking oil at the weld of the drain plug in the market application process. The paper analyzes and verifies the structure of the oil drain plug and finds that the reason is mainly caused by the unreasonable structure and layout of the seal. After that, through analysis and verification of welding defects, vibration endurance test, material comparison test, sealing reliability and process improvement, the existing structure is optimized to solve the oil leakage problem of the fuel tank, improve the durability of the fuel tank, reduce market loss, and provide a reference for the subsequent research on the improvement of the fuel tank. References | Related Articles | Metrics

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The Application Situation and Optimized Application of Automobile BIW Checking Fixture WEI Yongyin 2022, 47(15): 156-160.  DOI: 10.16638/j.cnki.1671-7988.2022.015.031 Abstract ( )   PDF (2118KB) ( )   In the quality control of the automobile manufacturing industry, body in white (BIW) checking fixture plays an important role in the control of automobile dimensional accuracy. This paper discusses the current status of BIW checking fixture manufacturing technology, puts forward some thoughts and suggestions on the design and manufacture of BIW checking fixture, to improve, detection efficiency and accuracy. BIW checking fixture design and manufacturing strategy is proposed, according to the sub assembly route and assembly requirements of sub-assemblies, to simplify checking fixture structure, reduce checking fixture manufacturing cost, and improve detection efficiency and effectiveness. The manufacturer of checking fixture should understand the actual application of checking fixture/gage in the factory, and consider the humanmachine engineering to improve the inspection efficiency. The manufacturing process of the checking fixture is considered for practical application, so as to improve the understanding of material characteristics, reasonably design the structure of the the checking fixture, and avoid the accuracy bias of the checking fixture due to the influence of material, structure, environment and other factors. Through the optimization of the design scheme of the checking fixture, the convenience and accuracy of the measurement data collection are improved, and the measurement reading error is reduced. References | Related Articles | Metrics

Automobile Education

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Investigations of Teaching Approach on Fundamentals of Fluid Mechanics Used by COMSOL LIANG Wei 2022, 47(15): 161-163.  DOI: 10.16638/j.cnki.1671-7988.2022.015.032 Abstract ( )   PDF (1188KB) ( )   Lectures on simulation of fluid mechanics is not so popular, this paper attempts to explore how to use the software COMSOL to solve the relevant physical phenomena on the teaching approach of fluid mechanics fundamentals. Compared with traditional teaching only using the PPT or blackboard writing, this teaching method can enable students to have a deeper understanding and learning interest on the relevant theoretical formulas of fluid mechanics, so as to improve the teaching quality. In addition, and the visualization of the easy-to-use interface of the software COMSOL is very friendly to teachers. References | Related Articles | Metrics

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Explorations and Practices of "Three Education" Reforms in Teaching of Higher Vocational Colleges — Take Automobile Chassis Construction and Maintenance as an Example CHEN Xin 2022, 47(15): 164-166.  DOI: 10.16638/j.cnki.1671-7988.2022.015.033 Abstract ( )   PDF (975KB) ( )   Teachers, teaching materials and teaching methods are the life of vocational education, and they are also the decisive factors affecting the quality and effectiveness of teaching. This article takes the course automobile chassis construction and maintenance as the starting point, analyzes the problems faced by the "three education reform" in the teaching of automotive professional courses in higher vocational colleges, and analyzes the "three education" reform in automobile chassis construction and maintenance. And the application of the "three teaching" reform in the automobile chassis construction and maintenance course is explored. Cultivate new youth in higher vocational colleges that meet the requirements of the new era. References | Related Articles | Metrics

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Teaching Exploration of Integrating Literature Cases into Material Failure Analysis Course DONG Xiaoping 2022, 47(15): 167-171.  DOI: 10.16638/j.cnki.1671-7988.2022.015.034 Abstract ( )   PDF (1499KB) ( )   In order to enable students to master failure analysis technology, the teacher has been teaching with the idea of literature case-teaching plan design-classroom teaching-extracurricular learning for many years. According to the syllabus, decompose the teaching content and form a knowledge module, use the full-text database to consult the literature, and design the teaching plan combine professional characteristics with training objectives.In classroom teaching, implement the interaction between teachers, students and students. According to the procedure of failure analysis, teachers teach students deeply analyze the literature research results, mining valid information required for failure analysis, and put forward effective prediction-protection-prevention measures. In addition, the push of extracurricular learning ways and contents is conducive to broaden students' knowledge field and vision. Therefore, the application of literature case teaching method has important practical significance for future students engaged in failure analysis in engineering material selection and processing, and detection of new materials and equipment, identification of accident responsibility and event prevention and prediction. References | Related Articles | Metrics

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The Talent Training of "Double Certificate Integration" of Private Vocational Undergraduate Courses Based on the 1 + X Certificate System QI Jinfeng 2022, 47(15): 172-175.  DOI: 10.16638/j.cnki.1671-7988.2022.015.035 Abstract ( )   PDF (1000KB) ( )   In view of the problems existing in private vocational undergraduate courses, taking the automobile service engineering major as an example, this paper expounds that by investigating the talent demand of automobile enterprises, the 1+X certificate catalogue of automobile vocational skills is formulated, the talent training scheme, curriculum standards and curriculum system are revised, and the content and standards of X certificate are integrated into the automobile professional courses. And reform course examination way, establish academic record education and X certificate credit system; It can effectively "double certificate integration" between academic certificate and 1+X certificate, and help students majoring in automobile to obtain X certificate related to vocational skills while obtaining academic certificate, and become high-level technical application-oriented professionals. References | Related Articles | Metrics

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Online Teaching of New Energy Vehicle Electrical Maintenance Course Based on Data CHEN Junjie 2022, 47(15): 176-181.  DOI: 10.16638/j.cnki.1671-7988.2022.015.036 Abstract ( )   PDF (2555KB) ( )   In the attempt of universities to carry out online teaching on a large scale, the core of efficient online teaching classroom lies in online teaching design. A new online teaching design method is designed and used for Internet+and national vocational education reform direction in this paper. New energy vehicle electrical system detection and diagnosis was developed based on this method. The practice results show that this on-line teaching design method can effectively stimulate students' interest in learning, improve the on-line teaching effect, and provide new ideas for further exploring the reform of new energy automobile electrical course. References | Related Articles | Metrics

Standards Regulations Management

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Analysis on Regulations Based on Coast Down Method of a Fixed Anemometer CHEN Liang 2022, 47(15): 182-186.  DOI: 10.16638/j.cnki.1671-7988.2022.015.037 Abstract ( )   PDF (1234KB) ( )   In the study of vehicle road load test methods, it is found that there are certain differences in the requirements of test conditions and data processing in test regulations at home and abroad. It is unknown how much these differences can affect the test results. By collecting domestic and foreign test regulations for comparative analysis, find out the differences in various regulations, and use actual cases to illustrate the impact of differences on data processing results, which is of great significance to the research or revision of road coast down test methods. References | Related Articles | Metrics

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Analysis and Suggestions on Offline Exhaust Emission Detection of Gasoline Vehicles under the New Regulations CHEN Jianzhong 2022, 47(15): 187-190.  DOI: 10.16638/j.cnki.1671-7988.2022.015.038 Abstract ( )   PDF (1240KB) ( )   In order to solve the problem of pollutant emission control of gasoline vehicles in China, the Ministry of Ecology and Environment has issued a new national standard on limits and measurement methods for emissions from gasoline vehicles. It has studied the changes in the national standard, the implementation process of the new regulations, and internal standard recommendations. Vehicle manufacturers should focus on the processes and control points, and set up a framework for the pollutant emission test and control system of newly produced gasoline vehicles under the new regulations to provide a reference for the pollutant emission test and evaluation work of vehicle manufacturers. It also conducts preliminary explorations for improving and innovating China's emission standard system. References | Related Articles | Metrics

Overview

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Influence of Urban Road Traffic Safety Facilities on Traffic Safety and Specific Countermeasures YANG Zhonglai 2022, 47(15): 191-194.  DOI: 10.16638/j.cnki.1671-7988.2022.015.039 Abstract ( )   PDF (989KB) ( )   With the continuous development of society, the construction of infrastructure in China is also increasing. As the infrastructure of transportation, urban road traffic plays an important role in China's economic development. Therefore, China vigorously paves and transforms urban road traffic to meet the needs of national economic development. In the process of urban road traffic construction in full swing, the construction of urban road traffic safety facilities has gradually attracted the attention of the society. Scientific and reasonable urban road traffic safety facilities can firmly control traffic safety and effectively ensure the safety of life and property of drivers. This paper will sort out and analyze the impact of urban road traffic safety facilities on traffic safety and optimization measures. References | Related Articles | Metrics

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Application of Lightweight Materials in Commercial Vehicle Whitebody ZHANG Xin 2022, 47(15): 195-198.  DOI: 10.16638/j.cnki.1671-7988.2022.015.040 Abstract ( )   PDF (1265KB) ( )   According to commercial vehicle development trend, lightweighting had become the focus of the development of whitebody. The application of lightweight materials is an important way to reduce the weigh of whitebody. This paper introduces the development trend of automotive lightweight materials such as high-strength steel, aluminum alloy, FRP and carbon fiber. Then we discuss the application status and existing problems of lightweight materials, which provides a reference for the application of lightweight materials in commercial vehicle whitebody. References | Related Articles | Metrics