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11 May 2024, Volume 49 Issue 9 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Use and Maintenance
Automobile Education


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New Energy Vehicle

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Research on the Superposition Relationship of Cell Expansion Force CHENG Qiang 2024, 49(9): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2024.009.001 Abstract ( )   PDF (1468KB) ( )   With the rise of the new energy industry, module design with high specific energy, low cost, and high assembly efficiency has become the mainstream trend. However, lithium-ion batteries may experience bulging during the charging and discharging process, which can lead to a decrease in the cycling life of the cells. Moreover, the expansion force from the cell to the module level is increasing, and excessive expansion force can cause damage to the module end and side plates. This article is based on the study of the superposition relationship of the expansion force of the cells, tested single cell, 2P1S, 1P2S, 3P1S, 1P3S, 4P1S, 1P4S, and 3P4S modules, the influence of the series and parallel connection of cells on the expansion force of the module can be ignored. And the expansion force of the module is a logarithmic function of the number of cells. Provide guidance for the design of safety modules by predicting the expansion force of modules in different grouping methods. References | Related Articles | Metrics

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Dynamic Stiffness Property under Different Preloads for Two Typical Rubber Bushings MIAO Yadong 2024, 49(9): 6-9.  DOI: 10.16638/j.cnki.1671-7988.2024.009.002 Abstract ( )   PDF (1312KB) ( )   The vibration isolation performance of the mounting system of the drive motor assembly has an important influence on the noise, vibration and harshness (NVH) of the vehicle. Rubber bush is used commonly in electric vehicles, which is simple in design, but has high requirements for its dynamic stiffness performance. Two typical rubber bush are selected in this article, and compared the dynamic stiffness curve under different preloads by finite element analysis. Especially analyze the difference how the preloads affect the first peak positions. Results show that the dynamic stiffness performance characteristics vary greatly due to different structures. References | Related Articles | Metrics

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Research on Flat Wire 6-layer Stator Winding and Embedding Technology for Permanent Magnet Synchronous Motors CHANG Yu 2024, 49(9): 10-14,34.  DOI: 10.16638/j.cnki.1671-7988.2024.009.003 Abstract ( )   PDF (850KB) ( )   The drive motor is crucial to the power performance and energy conversion efficiency of a car. Permanent magnet synchronous flat wire motors have gradually become the preferred choice for new energy vehicles due to their advantages such as high torque, constant power, and strong magnetic field. The article analyzes the performance parameters of a multi-layer flat wire motor and takes a permanent magnet synchronous flat wire 6-layer motor as an example. Two winding methods, stacked winding and wave winding, are used to unfold the winding diagram. The wiring method of the 6-layer stator winding is analyzed in detail, and it is found that copper is saved at the end during short distance winding of stacked winding, but the wiring is relatively messy and the final coil embedding is difficult. Although the lead wire of the wave winding is neat and beautiful, it cannot save the amount of copper used at the end during short distance winding. Based on this, the embedding technology of the stator winding of the flat wire motor is interpreted, aiming to solve the difficulties in vocational education and automotive maintenance technology. References | Related Articles | Metrics

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A Design of Electric Vehicle Reserved Charging Function MA Long 2024, 49(9): 15-18.  DOI: 10.16638/j.cnki.1671-7988.2024.009.004 Abstract ( )   PDF (667KB) ( )   In view of the demand for electric vehicle to charge at the trough of electricity price, this paper proposes a design scheme of electric vehicle reserved charging function. Users can set reserved charging parameters through the central control screen or App, including start time, end time, repeat cycle, and whether to continue charging if the end time is not full, and send them to T-BOX. T-BOX sends the charging request status to vehicle control unit according to the charging reservation setting and the current time, and vehicle control unit decides whether to charge the vehicle or wait for charging according to the charging status request flag sent by T-BOX and the vehicle status. The logic of the function is reasonable after the real car test, and it can meet the needs of users to make an appointment to charge and charge immediately. References | Related Articles | Metrics

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Modeling and Analysis of a Certain Battery Electric Vehicle Based on AMESim FAN Yayang 2024, 49(9): 19-23.  DOI: 10.16638/j.cnki.1671-7988.2024.009.005 Abstract ( )   PDF (866KB) ( )   At present, the research and development of electric vehicle mainly relies on simulation software such as Curise and CarSim, while the development software AMESim owned by Siemens has advantages in constructing models and simulation of system-level modeling in the field of multi-physics integration. Taking a certain battery electric vehicle as an experimental object, comprehensive consideration the power performance and energy flow of the vehicle, a onedimensional simulation model of the vehicle is constructed by AMESim software, and the key parameters of the parts are calculated and matched to design, so as to get the vehicle power and economy indexes. The reliability is verified by comparing the requirements of the performance indexes with the simulation results, and the results show that the data obtained by the simulation experiment using AMESim software can replace the real vehicle test to a certain extent, providing reliable data for shorten the development cycle of the vehicle. References | Related Articles | Metrics

Intelligent Connected Vehicle

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A Design Proposal for Front Underrun Protective Equipment Applied to Driverless Vehicle GUO Yongqing 2024, 49(9): 24-28.  DOI: 10.16638/j.cnki.1671-7988.2024.009.006 Abstract ( )   PDF (1415KB) ( )   This paper analyzes the types and performance of sensors used in a driverless vehicle. Aiming at the functional requirements of the driverless of a newly developed vehicle, the performance of a variety of sensors is compared, and various types of sensors are coordinated to meet the safety of driverless vehicle. On the premise of meeting the regulatory requirements of the front underrun protective equipment, the front underrun protective equipment as the carrier of sensors. According to different types of sensors, corresponding brackets are designed to be fixed on the front underrun protective, and the strength of the brackets is analyzed through computer aided engineering (CAE) simulation to meet the structural strength requirements. The final physical state meets the design expectations and achieves the design goal of forward development. References | Related Articles | Metrics

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Research on Vehicle Operation Scheduling Based on Freight Service-oriented Logistics Park TIAN Xin 2024, 49(9): 29-34.  DOI: 10.16638/j.cnki.1671-7988.2024.009.007 Abstract ( )   PDF (1231KB) ( )   In order to solve the problem of vehicle operation scheduling efficiency in freight serviceoriented logistics parks, this paper takes the shortest total operation time in the logistics park as the optimization goal, and establishes a vehicle operation scheduling model. By introducing the nonlinear dynamic inertia weight factor, an improved particle swarm optimization algorithm is designed to solve the problem, which can improve the solution efficiency and avoid falling into the local optimum. Numerical experiments verify that the vehicle operation scheduling scheme obtained by the improved particle swarm optimization algorithm has a good time optimization effect. At the same time, through the comparative analysis with the standard particle swarm optimization and genetic algorithm, it is verified that the optimized particle swarm optimization algorithm has higher solving efficiency and better solving results. References | Related Articles | Metrics

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Lane-changing Game Model of Intelligent Vehicle in Vehicle Networking Environment and Traditional Environment ZHANG Shun 2024, 49(9): 35-42.  DOI: 10.16638/j.cnki.1671-7988.2024.009.008 Abstract ( )   PDF (1496KB) ( )   This paper establishes a game theory-based lane-changing behavior model of intelligent vehicles and uses a bi-level programming algorithm to analyze the model in order to solve the decision-making problem of lane-changing behavior of intelligent vehicles in traditional environment and networked environment. The data gathered by the driving simulator and HighD database is used to simulate and analyze the model in this work. In both the traditional and networked environments, the model is able to forecast the best course of action for every vehicle involved in lane changes. The model's prediction results can aid in improving traffic efficiency and safety, serve as a valuable reference for the design and implementation of intelligent transportation systems, and provide recommendations for the intelligent vehicles' lane-changing techniques. References | Related Articles | Metrics

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Research on LKA Fusion Control Algorithm Based on Stanley Single Point Preview KUANG Shiqi 2024, 49(9): 43-49.  DOI: 10.16638/j.cnki.1671-7988.2024.009.009 Abstract ( )   PDF (1210KB) ( )   To address the issues of low tracking precision and poor driving stability of the lane keeping assistance (LKA) system when encountering curved roads, this paper focuses on the handling stability of vehicles equipped with the LKA system. A target steering angle module is established based on the single point preview optimal curvature model and the Stanley algorithm preview model. This module allows for a weighted combination of the steering angles calculated by each look-ahead model through the control steering angle weight model. With the collaborative work of other control modules, it ensures that the target steering angle module can provide accurate and appropriate steering guidance to help keep the vehicle centered in its lane and respond optimally to various driving and road conditions. This paper presents a vehicle simulation platform for the LKA system, built using MATLAB/Simulink and TruckSim. By setting various driving scenarios, the effects of different speeds and road shapes on trajectory tracking performance are studied. The co-simulation validates the effectiveness of the algorithm, demonstrating that the designed LKA fusion control algorithm model exhibits strong robustness, high tracking precision, and stability under curve interference. It keeps good performance and constraint satisfaction in various steering scenarios, ensuring precise and stable vehicle operation. References | Related Articles | Metrics

Design and Research

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Nonlinear Dynamic Analysis of Coupled Faulty Rotor Systems SHI Luguang 2024, 49(9): 50-54,79.  DOI: 10.16638/j.cnki.1671-7988.2024.009.010 Abstract ( )   PDF (1334KB) ( )   To study the influence of multi fault coupling on the dynamics of rotor systems, a crack-friction coupling fault rotor system dynamics model under rigid support is established. The fourth-order Runge-Kutta method is used to numerically solve the equation, and the dynamic response of the rotor system under changes in parameters such as stator stiffness and crack depth is compared and analyzed. By using the bifurcation diagram of the system to analyze its nonlinear dynamic behavior and system stability, the interaction law between faults and rotational speed is obtained. The results show that with the change of parameters, the system is exhibit rich dynamic behaviors, including single period, multi period, quasi period, and chaos. The research results provide a theoretical basis for the design and fault diagnosis of the drive motor rotor system in automobiles. References | Related Articles | Metrics

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Design Strategy of Heavy Duty Commercial Vehicle Floor WEI Yibing 2024, 49(9): 55-59.  DOI: 10.16638/j.cnki.1671-7988.2024.009.011 Abstract ( )   PDF (784KB) ( )   In order to solve the production and quality problems caused by the design problems of the floor of heavy commercial vehicles, and consider the requirements of weight control under the background of the development of the floor of variant vehicle and "carbon neutral", the floor design strategy of "advance" is proposed to solve the product problems. Through the analysis of common design problems, it is proposed that the modular design of the floor should be coordinated in the design stage. The definition of the floor materials and standard parts should integrate the characteristics of the material, the function and performance of the parts and consider the platform, and the lightweight design of the floor should be carried out from the aspects of material, structure and process, effectively reduce development costs, reduce design problems, reduce parts weight, and improve production logistics efficiency. References | Related Articles | Metrics

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Research on Fuzzy PID Control Strategy for Semi-active Mount of Vehicle Cab SHI Jinhua 2024, 49(9): 60-66.  DOI: 10.16638/j.cnki.1671-7988.2024.009.012 Abstract ( )   PDF (1830KB) ( )   In order to study the effect of adjustable damping semi-active cab mounts of commercial vehicles on ride comfort, a vehicle model and a left and right wheel track roughness model are established in TruckSim. Proportional-integral-derivative (PID) and fuzzy-PID controller models are built in MATLAB/Simulink. The actuator model is established based on the external characteristics test results of the continuous damping control (CDC) damper in relevant literature. Using the sum of root mean squarevalues of vertical, pitch, and roll accelerations of the commercial vehicle cab as the vibration evaluation criteria, the vibration situation of cab with passive and semi-active mounts at speeds of 50 km/h and 90 km/h are compared through TruckSim and Simulink co-simulation. The simulation results show that compared to passive mounts, semi-active mounts based on PID and fuzzy PID can significantly improve the ride comfort of commercial vehicle cab, the two control strategies have very similar control effects, improving the overall vibration situation of cab by approximately 13.28% and 14.02% under both working conditions. References | Related Articles | Metrics

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Research on Global Optimization Strategy of Racing Aerodynamics Package FAN Qinhong 2024, 49(9): 67-74.  DOI: 10.16638/j.cnki.1671-7988.2024.009.013 Abstract ( )   PDF (2531KB) ( )   The optimization of the formula student aerodynamics package has an important impact on the fuel economy and handling stability of the car. From a global perspective, a total of 10 design variables of front wing, rear wing and flank fin angle of attack are selected, and different experimental design methods, approximate model building methods and multi-objective optimization methods are compared laterally. Then, through lap speed simulation, the optimization strategy most suitable for airfoil angle of attack optimization is selected, and the vehicle is optimized based on this strategy. Compared with the aerodynamic performance of the whole vehicle before and after optimization, the aerodynamic negative lift of the final car increased by 19% and the drag increased by 2.03%, which better improved the aerodynamic performance of the car. The results show that this optimization strategy can provide some guidance for the selection of the angle of attack of the racing wing. References | Related Articles | Metrics

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Design of Double-acting Cylinder Sequential Control Valve WEI Zhiqi 2024, 49(9): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2024.009.014 Abstract ( )   PDF (2133KB) ( )   Control valves are the core components of fluid control. In order to make the fluid achieve specific functions according to human purposes, various types of control valves emerge one after another. In the production of manufacturing enterprises, the control of two single-stroke cylinders or one double-stroke cylinder requires two independent control valves. In order to simplify the control mode and improve safety, avoid the operation error of multiple cylinders with sequential control requirements, and improve the safety and reliability of production, this paper designs a four-position seven-way valve with sequential requirements, no control logic confusion, and can reduce the number of control valves through innovative ideas, the valve is used in the end face processing process of the engine cylinder head, and the main function is to control the double-stroke cylinder to expand and contract according to the sequence requirements, reduce the number of control valves, and compact structure. The valve has been in production for many years without fail, fully confirming the simple, efficient and reliable boundary requirements of a first-class tool. At the same time, the four-position seven-way valve described in this article provides a new solution for the industry's fluid control. References | Related Articles | Metrics

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The Influence of the Opening Rate of the Mesh Cover on the Frequency Response and Sound Quality of Loudspeaker in Vehicle XIAO Feng 2024, 49(9): 80-84.  DOI: 10.16638/j.cnki.1671-7988.2024.009.015 Abstract ( )   PDF (2231KB) ( )   Loudspeakers in cars are typically positioned in the car door panel, A-pillar, and other areas. To meet aesthetic requirements, a mesh cover is commonly used to shield them. However, the mesh cover can alter the radiation characteristics of the loudspeakers, which can negatively impact the sound reproduction in the car. This study aims to investigate the effects of different mesh cover hole rates on the frequency response and sound quality of loudspeakers. The research begins by analyzing the theoretical impact of mesh covers on the radiation characteristics of loudspeakers. Next, objective measurements are conducted to assess the frequency response characteristics of loudspeakers equipped with mesh covers of varying hole rates. Finally, subjective experiments are carried out to verify the influence of different mesh covers on the sound quality of the loudspeakers. The findings reveal that the mesh cover primarily affects the high-frequency region of the loudspeaker's frequency response. Additionally, a lower opening rate of the mesh cover presents a greater obstacle to the radiation characteristics of the loudspeaker. These results provide valuable insights for the design of loudspeaker mesh covers in cars. References | Related Articles | Metrics

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Research on Intelligent Emotional Experience in New Energy Vehicle Styling FU Jianbo 2024, 49(9): 85-89.  DOI: 10.16638/j.cnki.1671-7988.2024.009.016 Abstract ( )   PDF (1721KB) ( )   By decoding the application way of emotional design in the styling of new energy vehicle, the paper summarizes the development trend of emotional design. Using scientific methods such as quantitative research and perceptual engineering testing tools to explore the design rules of intelligent emotional experience of new energy vehicle. By analyzing the emotional design ideas of different brands, the application rules of intelligent emotional experience, grasping the actual effect of emotional experience, and formulating design strategies for intelligent emotional experience of new energy vehicle is formulated. By improving the level of emotional experience to enhance user stickiness, it provides a reference for engineering and technical personnel which engage in automotive styling design. References | Related Articles | Metrics

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BLDC Motor Based on Variable Structure PI Pressure Control to Drive the Hydraulic Pump XU Cunguo 2024, 49(9): 90-94,162.  DOI: 10.16638/j.cnki.1671-7988.2024.009.017 Abstract ( )   PDF (1263KB) ( )   In the application of automatic transmission hydraulic control, the hydraulic system of slide valve plate has some defects, such as poor control precision, multi-parameter coupling and difficult to establish system model. This paper presents a pressure control strategy for hydraulic pump driven by brushless direct current (BLDC) motor based on model variable structure proportional integral (PI), which combines the advantages of good dynamic characteristics and high control accuracy with the advantages of simple structure and good reliability of hydraulic pump. The proportional integral control model of motor speed is established according to the characteristic relation of hydraulic pump speed, flow rate and pressure and the parameters of oil temperature, viscosity and elastic modulus, etc. The output pressure of hydraulic pump is adjusted by the motor drive duty ratio signal which is easily controlled. The control system eliminates the pressure deviation and overshoot through the variable structure proportional integral control, and improves the system accuracy. The simulation results show that the variable structure proportional integral control is feasible, and the test results show that the system response of the model control is better than that of the pure proportional integral closed-loop control, and it has a good ability to resist load disturbance. References | Related Articles | Metrics

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Safety Performance Study and Optimization of 2024 Version C-NCAP Frontal Collision Speed Increase WANG De 2024, 49(9): 95-100.  DOI: 10.16638/j.cnki.1671-7988.2024.009.018 Abstract ( )   PDF (2130KB) ( )   This study aims to assess the impact of the increased collision speed, as stipulated in the 2024 version of the China-new car assessment program (C-NCAP), on the crashworthiness of sedan, sport utility vehicle (SUV), and multi-purpose vehicles (MPV) vehicle models. Through finite element simulation methods, it is observed that raising the speed from (50+1) km/h to (55+1) km/h resulted in increased intrusion of the front panel, a rise in the peak acceleration of the occupant compartment, and an approximately 4g increase in overall load cases (OLC). Simultaneously, the safety performance of the driver's side restraint system deteriorated, with an elevated risk of head contact with the steering wheel and a decrease in chest compression. In response to these findings, optimization strategies are proposed, serving as valuable references for the passive safety development under the 2024 C-NCAP standards. Additionally, these suggestions offer strategic guidance for early-phase passive safety optimization in the automotive industry. References | Related Articles | Metrics

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Design of Key Characteristics of Hydraulic ABS/ESC Pump Subsystem and Test Method GUO Shuyuan 2024, 49(9): 101-106.  DOI: 10.16638/j.cnki.1671-7988.2024.009.019 Abstract ( )   PDF (1972KB) ( )   As the basis of active safety and brake-by-wire technology, the localization of hydraulic anti-lock brake system (ABS)/electronic stability control (ESC) has a certain theoretical research foundation, but the original design requirements are not well understood and the failure management system is not perfect, which makes engineers will encounter various practical problems in the process from theoretical research to engineering practice. This paper studies the design requirements of the pump subsystem for the key characteristic parameters of related parts from the three aspects of ABS pressure reduction function, ESC pressure reduction function and ESC active pressure building function of hydraulic brake, focuses on analyzing and solving the related wheel side negative pressure problem and its failure mechanism. Finally, this paper introduces the hydraulic bench test method of designed function, performance verification and failure verification. These methods have strong practicability and engineering application value. This test bench is highly integrated, and the test method has strong practicability and engineering application value. References | Related Articles | Metrics

Testing and Experiment

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Model and Thermal Decay Mechanism Analysis of Disc Brake WANG Xinze 2024, 49(9): 107-112.  DOI: 10.16638/j.cnki.1671-7988.2024.009.020 Abstract ( )   PDF (2378KB) ( )   Thermal decay is an important factor affecting brake stability. The finite element model of thermal and mechanical coupling of brake disc is established with ABAQUS/Explicit to analyze thermal decay mechanism, and constrained modal analysis of brake disc and friction disc is carried out. Simulation and research show that the vibration of the brake edge is more obvious and mode of vibration is mostly axial bending in modal analysis. The vibration deteriorates the disk-plate contact resulting in large and uneven distribution of stress and temperature gradient. Value of friction coefficient fluctuates greatly under actual braking. References | Related Articles | Metrics

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Numerical simulation Analysis on the Transient Temperature Field of Disc Brake under Different Braking Processes TIAN Zhenfang 2024, 49(9): 113-116，166.  DOI: 10.16638/j.cnki.1671-7988.2024.009.021 Abstract ( )   PDF (1188KB) ( )   In order to accurately predict the temperature field distribution of braking system under actual working conditions, the pressure-dependent frictional coefficient, temperature-dependent thermophysical properties of materials, contact pressure increasing exponentially with time, and braking speed are considered comprehensively. The thermal characteristic of disc brake during single braking is studied by using finite element method, and the braking time, braking distance, and transient temperature field distribution under different contact pressure are obtained. The results show that the temperature of the brake disc rises and then decreases during the process of braking. The smaller the contact pressure, the longer the braking time and braking distance, and the smaller the temperature rise. The temperature of the brake disc fluctuates in a zigzag pattern, and the amplitude of the fluctuation increases first and then decreases. The research results provide a theoretical basis for the accurate prediction of braking performance and have certain practical value in engineering. References | Related Articles | Metrics

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Application of Flexible Coordinate Measuring Machine in Automotive Crash Test LIU Baoli 2024, 49(9): 117-120.  DOI: 10.16638/j.cnki.1671-7988.2024.009.022 Abstract ( )   PDF (2016KB) ( )   With the continuous updating and development of the standard system and testing methods for car crash safety testing in various countries, the application scope of flexible coordinate measuring machine in automotive crash testing is increasing, and it has become one of the main testing equipment for automotive crash testing. This article briefly summarizes the application cases and methods of flexible coordinate measuring machine in automotive crash test processes , including compartment intrusion measurement, seat adjustment, H-point position measurement, dummy installment and measurement, photographic targets positioning, vehicle collision reference line positioning, and moving progressive deformable barrier (MPDB) honeycomb aluminum barrier deformation measurement. It provides a reference for engineering and technical personnel who are about to engage in automotive crash testing to understand the application of flexible coordinate measuring machine in automotive crash testing References | Related Articles | Metrics

Process·Materials

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Design and Research on the Continuous Fiber Composite Battery Package Upper Cover CHEN Guofeng 2024, 49(9): 121-127.  DOI: 10.16638/j.cnki.1671-7988.2024.009.023 Abstract ( )   PDF (8303KB) ( )   Lightweight technology can effectively improve the range and driving performance of new energy vehicles, and has been widely applied in the production and manufacturing of automobiles. Compared with traditional metal materials, fiber composite materials have advantages such as specific strength and stiffness, low thermal expansion coefficient, and good fatigue resistance, ushering in a new era of lightweight. This paper takes the battery pack (the core component of new energy vehicles) as the research object. Based on the high pressure resin transfer molding (HP-RTM) process, the upper cover of the battery pack is lightweight designed using carbon fiber composite materials and glass fiber composite materials. A lightweight mass production plan for the battery pack cover is completed through technical means such as structural optimization, process optimization, and connection method optimization. The test results of the battery package prototype show that the upper cover of the battery pack made of carbon fiber composite material and glass fiber composite material can effectively improve the strength, stiffness, and fatigue resistance of the battery pack structure, with a comprehensive weight reduction of over 50%. The lightweight design scheme of continuous fiber composite materials described in this article can also provide guidance for the design of other automotive components. References | Related Articles | Metrics

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Analysis of a Passenger Car Body in White Total Assembly and Trial Production Line WANG Guochun 2024, 49(9): 128-132.  DOI: 10.16638/j.cnki.1671-7988.2024.009.024 Abstract ( )   PDF (3410KB) ( )   At present, China has become the world's largest single automobile production and sales market. The mainstream solution of passenger car body in white in the Chinese market is based on carbon steel punching and welding forming, and every passenger model from research and development to formal batch production be tested first to ensure that the structure and performance of the body in white solution meet the design requirements. The general assembly and integration process is one of the key processes in the body in white trial production process. Due to the fixed production of vehicle models, the conventional mass production line can not meet the needs of flexible and rapid switching production if it needs a lot of time and manpower to adjust the production model. Therefore, it is of great significance to study the passenger car body in white total assembly trial production line for the improvement of China's passenger car trial production and development capacity. Taking a carbon steel body in white total assembly production line as an example, the layout and application of this type of production line are analyzed and studied in detail. References | Related Articles | Metrics

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Application Analysis of 3D Printing Technology in Body Shop GUO Haiyang 2024, 49(9): 133-136.  DOI: 10.16638/j.cnki.1671-7988.2024.009.025 Abstract ( )   PDF (3615KB) ( )   Automobile manufacturing costs need to be continuously optimized and the manufacturing cycle is constantly compressed and optimized with the increasing competition in the automotive industry. Therefore, the 3D printing technology with efficient processing capacity, cost saving and lightweight characteristics has been increasingly applied and promoted in automobile manufacturing. This paper mainly studies the application scenarios of non-metallic 3D printing technology in the body shop, and analyzes its application characteristic. It provides a reference for the non–metallic 3D technology application in body shop of automobile manufacturing. References | Related Articles | Metrics

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Analysis on Accuracy Improving of Arc Welding Body Frame MA Yanfang 2024, 49(9): 137-140.  DOI: 10.16638/j.cnki.1671-7988.2024.009.026 Abstract ( )   PDF (1520KB) ( )   Traditional car bodies generally adopt a structure formed by sheet metal stamping and resistance welding. However, in certain scenarios, it is necessary to develop car bodies with a structure that uses a skeleton for internal support and a skin for external coverage. However, due to factors such as arc welding stress deformation, the accuracy of such skeletons is difficult to guarantee. In order to investigate the causes of the problem of insufficient skeleton accuracy and its improvement methods, this article analyzes from the aspects of component manufacturing accuracy, welding stress deformation, structural design, and benchmark selection, and summarizes and elaborates on a solution to improve the welding accuracy of a car body skeleton. References | Related Articles | Metrics

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Failure Analysis of a 40Cr Automotive Stabilizer Bar Ball Pin Fracture YU Huanwei 2024, 49(9): 141-145.  DOI: 10.16638/j.cnki.1671-7988.2024.009.027 Abstract ( )   PDF (5663KB) ( )   The automotive stabilizer is an important component that ensures the smoothness, handling stability, comfort, safety, and accurate driving of the vehicle. Once the ball pin of the stabilizer bar fails, it will lead to the loss of the overall function of the car stabilizer bar, seriously threatening the safety of car driving. An analysis is conducted on the fracture cause of the ball pin in the 40Cr automotive stabilizer bar. To determine the cause of failure, a comprehensive failure analysis is conducted, including macroscopic inspection, chemical composition analysis, metallographic structure analysis, micro Vickers hardness testing, fracture analysis, and hydrogen content detection. In combination with resistance welding and galvanizing processes, it is found that the fracture mode of the ball pin is intergranular brittle fracture. The reason for the fracture is the presence of local non-fusion in the outer layer of the resistance welding fusion zone and the ineffective hydrogen removal treatment after galvanizing, which led to hydrogen absorption in the welding area, resulting in hydrogen embrittlement fracture. By comparing the hydrogen content before and after heat treatment at 200 ℃ for 2 hours, it is proposed to increase the hydrogen elimination heat treatment process and control the resistance welding process parameters, aiming to avoid similar fracture failure and provide reference for the manufacturing of ball pins. References | Related Articles | Metrics

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Research on Disorderly Auto Bin Picking Technology for Body Parts ZHUANG Jingxiong 2024, 49(9): 146-150.  DOI: 10.16638/j.cnki.1671-7988.2024.009.028 Abstract ( )   PDF (3268KB) ( )   The styles and packaging forms of parts in the body shop of a vehicle manufacturing factory are complex and diverse, and the automatic picking of small metal parts that are stacked in an disorderly manner is a key link in achieving complete automation of parts loading. The article takes the automatic picking of a small metal part in an unordered stacked packaging as a case study and builds a verification system that includes robots, grippers, material boxes, and vision. The system focuses on three key steps involved in bin picking technology: part recognition, path planning, and transportation positioning. The research results show that the three key factors affecting the equipment running rate and bin cleaning rate are the selection of visual sensor type, the accuracy of part positioning after picking, and the design form and color of material bins. The identification of key factors affecting disorderly picking ensures the systematic reliability of disorderly picking of body parts, providing a reference for the application of disorderly bin picking in vehicle manufacturing workshops. References | Related Articles | Metrics

Use and Maintenance

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Briefly Analyzes Current Situation and Development Forecast of China's Expressway Automobile Maintenance Industry ZHAO Weihua 2024, 49(9): 151-154.  DOI: 10.16638/j.cnki.1671-7988.2024.009.029 Abstract ( )   PDF (991KB) ( )   Analyze the problems of low-quality development and low social recognition of the expressway automobile maintenance service system, and systematically study the development history and characteristics of the industry. Through the analysis of the history and current situation of research on expressways and expressway automobile maintenance service models at home and abroad, this paper systematically summarizes the development stages of China's expressway automobile maintenance industry and puts forward common problems in the automobile repair industry. Propose management strategies and suggestions for industry development through suggestions on automobile maintenance service standards in expressway service areas, suggestions on industry management reform, and suggestions on enterprise business service models. References | Related Articles | Metrics

Automobile Education

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Teaching Reform and Practice for Ideological and Political Education of Automobile Theory Course Based on OBE Concept HU Aijun 2024, 49(9): 155-158.  DOI: 10.16638/j.cnki.1671-7988.2024.009.030 Abstract ( )   PDF (1219KB) ( )   Based on the concept of outcome based, with the goal of improving students' professional knowledge, abilities and literacy, according to the content of Automobile Theory teaching to thoroughly tap the ideological and political elements, integrate ideological and political elements with curriculum teaching content, reasonable design and teaching implementation plan, assessment method and other links, and continue to improve the teaching link according to the course of the course goal and the effect of the course of ideological and political. The teaching quality of the Automobile Theory course is greatly improved through the teaching reformation for the mode of collaborative education of the knowledge transfer, capacity building and ideological and political education. References | Related Articles | Metrics

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Reform and Practice of Heat Treatment Technology and Equipment Course Teaching ZHANG Hongliang 2024, 49(9): 159-162.  DOI: 10.16638/j.cnki.1671-7988.2024.009.031 Abstract ( )   PDF (1132KB) ( )   Heat treatment plays a vital role in modern manufacturing industry, especially in automobile manufacturing industry. How to train high quality heat treatment engineers is the challenge that the university education and teaching work faces. The course of heat treatment process and equipment mainly teaches the formulation and optimization of heat treatment process of metal materials and the reasonable selection and design of heat treatment equipment. In recent years, the course of heat treatment technology and equipment in Shenyang Aerospace University keeps up with the development needs of the industry, and has carried out teaching reforms in the aspects of teaching content reconstruction, teaching method innovation and assessment method optimization, which has improved students' learning enthusiasm and cultivated their innovative thinking and engineering application ability. References | Related Articles | Metrics

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Exploration of the Teaching Mode of Theory and Practice of Mechanical Innovation Course in the Background of New Engineering ZHAI Hongfei, 2024, 49(9): 163-166.  DOI: 10.16638/j.cnki.1671-7988.2024.009.032 Abstract ( )   PDF (1143KB) ( )   The teaching mode of professional courses in colleges and universities often focuses on the teaching of theoretical knowledge and ignores the cultivation of students' practical ability and innovation ability, so it is necessary to advocate students to use innovative thinking and innovative consciousness in problem-solving and practice. The innovation and entrepreneurship course - Theory and Practice of Mechanical Innovation cultivates students' innovative thinking, comprehensive ability and practical ability through course positioning, implementation process and multi-index assessment, and improves students' non-technical abilities such as humanistic quality and teamwork, so that they can better adapt to the requirements of future economic and social development and achieve personal career development. References | Related Articles | Metrics

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Construction and Development of Loose-leaf Teaching Material Resources of Automobile Specialty Under the Background of "Three Education" Reform －Taking the Course of Automobile Maintenance and Maintenance as an Example CHAI Bin 2024, 49(9): 167-171.  DOI: 10.16638/j.cnki.1671-7988.2024.009.033 Abstract ( )   PDF (956KB) ( )   Under the background of "Three education" reform, the teaching mode of automobile specialty needs to be updated and improved. Taking the course of Automobile Maintenance and Maintenance as an example, this paper explores and develops the teaching resources for the deficiency of traditional teaching materials. Based on a comprehensive study of current automobile industry technology, combined with students' learning needs and practical application scenarios, this paper puts forward a new Loose-leaf teaching material resource construction and development scheme for automobile specialty teaching, the application of this new-type teaching material has a certain demonstrative effect on improving the teaching quality of automobile specialty and cultivating the talents with practical operation ability and innovative spirit. References | Related Articles | Metrics

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Exploration of the Reform of Talent Training Mode in Automotive Service Engineering Major LI Xiangqin 2024, 49(9): 172-176,184.  DOI: 10.16638/j.cnki.1671-7988.2024.009.34 Abstract ( )   PDF (1314KB) ( )   With the continuous innovation of automotive technology, intelligent connected vehicles and new energy vehicles have become important strategic directions for the transformation and upgrading of the global automotive industry, and are research hotspots in the field of intelligent transportation worldwide. The rapid development of intelligent connected vehicles and new energy vehicle technology has posed great challenges to service-oriented talents in the automotive aftermarket, and has also put forward higher requirements for the cultivation of automotive service application-oriented talents in various universities. This article takes the automotive service engineering major of Jiangxi University of Technology as an example. Firstly, it analyzes the current situation and existing problems of talent cultivation in the automotive service engineering major. Then, under the development trend of intelligent connected new energy vehicles, reform ideas are proposed from the aspects of talent cultivation plan, curriculum system, faculty construction, and student practical application ability. The paper explores and studies the talent cultivation mode of the automotive service engineering major, intended to improve the quality of professional talent cultivation and cultivate application-oriented, high-quality, and versatile talents suitable for the era of connected vehicles. References | Related Articles | Metrics

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Research on the Construction of Ideological and Political Teaching System for Vehicle Engineering Major Courses Under the Background of New Engineering Education CUI Likun 2024, 49(9): 177-180.  DOI: 10.16638/j.cnki.1671-7988.2024.009.035 Abstract ( )   PDF (1085KB) ( )   Based on the characteristics and industry demands of the vehicle engineering profession in the new era, it is found that the main goal of ideological and political education is to cultivate talents with good ideological and moral qualities and a sense of the times. Therefore, this paper gives the method based on the outcome based education (OBE) concept is proposed to construct the ideological and political teaching system of the vehicle engineering profession. This includes creating a talent training system for ideological and political education under the background of the new engineering discipline, multi-dimensional collaboration in curriculum construction, strengthening the construction of the teaching staff, and creating a school-enterprise cooperation model that integrates ideological and political education into the curriculum. These measures aim to organically integrate ideological and political education elements into the teaching of vehicle engineering courses at various levels, in order to effectively improve the ideological and political quality of professional courses. References | Related Articles | Metrics

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Analysis of the Ability Demand of Intelligent Connected Vehicle Industry Job HONG Shun 2024, 49(9): 181-184.  DOI: 10.16638/j.cnki.1671-7988.2024.009.036 Abstract ( )   PDF (1214KB) ( )   With the deep transformation of the automobile industry, the era of intelligent connected vehicle is gradually coming, and the ability requirements for automotive talents are also increased. "New" automotive talents need to have interdisciplinary knowledge and skills, especially intelligent connected vehicle technical personnel need to meet the needs of composite post ability, and need to strengthen innovative thinking and service concept. According to the different positions of intelligent connected vehicle testing, research and development assistance, maintenance, marketing, debugging, etc., the corresponding post ability demand analysis is carried out. In combination with the preliminary orientation of the Intelligent Connected Vehicle Technology Application major in the School of Transportation of Shenzhen Institute of Technology: based on the intelligent connected vehicle market, it can be compatible with middle and upstream industries (auxiliary research and development, simulation positions, etc.), to fully meet the needs of the intelligent connected vehicle industry, based on the basic hardware ability, cultivate students' software development and testing capabilities, actively adjust the development orientation of the major, and cultivate high-quality talents with the times and innovation. To train high-tech talents for Shenzhen intelligent connected vehicle industry. References | Related Articles | Metrics