Archive

09 September 2024, Volume 49 Issue 17 Previous Issue   
---
New Energy Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

New Energy Vehicle

Select

Research on Rault-Tolerant Control for Motor Failure in Distributed Drive Electric Vehicles ZHI Jinning, JIN Feng, YAN Wenzhi, CHENG Xiaoze, LI Yongfeng 2024, 49(17): 1-7.  DOI: 10.16638/j.cnki.1671-7988.2024.017.001 Abstract ( )   PDF (992KB) ( )   In order to improve the stability of distributed drive electric vehicle under single motor fault state, a fault-tolerant control method combining driving force reconstruction and active front steering (AFS) is proposed. Firstly, a sliding mode controller is designed to control the yaw rate and the center of mass deflection angle. Secondly, an optimal distribution model of vehicle driving force is established under the condition of motor failure. When the vehicle motor fails, the use of quadratic programming algorithm for the motor torque into row refactoring allocation. At the same time, when a motor fails and the output of the same side motor is saturated and can not provide enough yaw torque, additional yaw torque is provided by active front steering. Finally, the CarSim/Simulink joint simulation model is built to test. The results show that the fault-tolerant control method can effectively improve the vehicle stability and power. References | Related Articles | Metrics

Select

Insulation Detection Method and Fault Analysis of Battery Electric Commercial Vehicle FAN Ning, YANG Jie, DONG Xin, GAO Xing, LI Bin 2024, 49(17): 8-12,24.  DOI: 10.16638/j.cnki.1671-7988.2024.017.002 Abstract ( )   PDF (3452KB) ( )   The working condition of battery electric commercial vehicle has complex road conditions and harsh working conditions, which leads to the acceleration of the wear rate of the vehicle electrical equipment, resulting in the continuous decline of the insulation resistance of the electrical equipment, and if not handled in time, there may be safety hazards or cause major safety accidents. Based on the principle of insulation fault detection, this paper analyzes and explores the application of an insulation detection and positioning technology, and a set of low-voltage signal transmission system consisting of insulation detector, current transmitter, current transformer and insulation fault locator is connected and installed in each high-voltage circuit of the vehicle. Through the real-time transmission of the system current signal, the fault loop is quickly and accurately located and the fault location is locked. This technology provides a fast, efficient and accurate solution for the investigation of faulty vehicles in the aftermarket. References | Related Articles | Metrics

Select

DNA Design Method for Gear Order Noise of New Energy Passenger Vehicle Transmission ZHAO Lei, WEI Sen, LUO Jiejun, LIU Lijuan, MAI Chengxian 2024, 49(17): 13-18.  DOI: 10.16638/j.cnki.1671-7988.2024.017.003 Abstract ( )   PDF (2379KB) ( )   With the development of new energy vehicles, the transmission level noise originally covered by the engine has become prominent, and the improvement work is often in conflict with the tight cycle and resources of the project. Aiming at the problem of transmission gear order noise, this paper provides a design method starting from "DNA", advocating that various indicators related to order noise should be considered from the beginning of design, improving the success rate of a design, shortening the development cycle and reducing verification resources, and providing a new design method for transmission manufacturers in the same industry. References | Related Articles | Metrics

Select

Finite Element Analysis of the Influence of Heat Dissipation Holes on the Strength of Automotive Battery Box JIANG Jinxin1 , WANG Xiaoxin2 2024, 49(17): 19-24.  DOI: 10.16638/j.cnki.1671-7988.2024.017.004 Abstract ( )   PDF (1164KB) ( )   This paper investigates the impact of the diameter of heat dissipation holes in the battery pack of new energy vehicles on the structural strength of the battery pack using finite element analysis methods based on ANSYS Workbench software. Three sets of battery packs with different diameters of heat dissipation holes and one set without heat dissipation holes are set up for comparison. The study examines the positions and magnitudes of maximum stress and maximum displacement of battery packs with various hole diameters under static, emergency braking, and sharp turning conditions. Based on the research findings, it is revealed that as the diameter of the heat dissipation holes increases, the maximum stress and maximum displacement of the automotive battery pack under various operating conditions also increase correspondingly. The results of this paper will provide valuable insights for the design of heat dissipation holes in automotive battery packs. References | Related Articles | Metrics

Select

Research on the Harmonic Influence of Controller Based on the Performance of Drive Motor ZHENG Haibing, WEN Huaming 2024, 49(17): 25-28.  DOI: 10.16638/j.cnki.1671-7988.2024.017.005 Abstract ( )   PDF (1724KB) ( )   This study demonstrates the reasons for the low measure efficiency of the drive motor, it has important guidance and reference value to analyze and solve the problem of motor unit efficiency not up to standard.In this paper, the causes of harmonics and their influence on the performance of the motor are analyze theoretically, and the influence of harmonics on the output torque and efficiency of the motor is demonstrate by means of simulation analysis. Based on a new energy passenger car drive motor, combine with two controllers, the negative impact of harmonics on the efficiency of the motor is demonstrated through the analysis of the deviation value of the harmonic value difference of the controller and the measured motor efficiency. Finally, the necessity of harmonic suppression to improve the efficiency of the motor is illustrated, and the relevant feasible optimization measures are provided. References | Related Articles | Metrics

Select

Exploration of the Collaborative Strategy between Electric Vehicle Energy Storage Systems and Resource Intensive Utilization in Chengde MA Chunhui1 , SONG Suzhen2 , GAO Yanan1 , WANG Liang1 2024, 49(17): 29-32.  DOI: 10.16638/j.cnki.1671-7988.2024.017.006 Abstract ( )   PDF (774KB) ( )   This study focuses on how Chengde city can promote the coordinated development of electric vehicle energy storage systems and resource intensive utilization through strategic measures. Against the backdrop of global energy transition and environmental protection, this initiative is crucial for enhancing Chengde's energy efficiency, optimizing its energy structure, and increasing the proportion of clean energy, thereby contributing to achieving sustainable development. The strategies include policy support, technological innovation, optimization of resource allocation, and regulatory evaluation, aiming to stimulate market vitality, enhance system performance, achieve efficient energy utilization, and ensure the safe and stable operation of the system. As a pioneer in energy transition, Chengde city will deepen cooperation and exchanges, provide valuable experiences and models for other cities to jointly promote the development of green energy. References | Related Articles | Metrics

Design and Research

Select

Lightweight Design and Application of Commercial Vehicle Chassis YU Dong1 , ZHOU Wen1 , LAN Jun1 , LI Jun1 , XIAO Fei*1 , WANG Jiahan2 2024, 49(17): 33-37,49.  DOI: 10.16638/j.cnki.1671-7988.2024.017.007 Abstract ( )   PDF (3050KB) ( )   This article summarizes and analyzes the engineering application of chassis lightweight technology in a domestic commercial vehicle enterprise. It analyzes the lightweight technology of chassis at home and abroad, as well as the future development trends and challenges. It proposes that the current main lightweight technology route for commercial vehicles is to adopt lightweight and high-strength advanced materials, and to integrate advanced optimization design methods with advanced manufacturing processes. The article focuses on listing the engineering application of chassis lightweight technology and the achieved weight reduction effects in the application of ultra-high-strength steel frame assembly, ultra-high-strength steel front lower protection, high-grade ductile iron front connecting beam, high-stress material leaf spring,aluminum alloy leaf spring bracket, and high-efficiency cooling module lightweight technology. This provides valuable engineering reference for technical personnel engaged in the development and research of chassis lightweight technology in the commercial vehicle industry. References | Related Articles | Metrics

Select

Optimization Design and Analysis of Suspension System for Four-wheel Drive Baja Race Car XIA Mingzhe, DU Jiamin, LU Zicong, HUANG Xi, XU Sha* 2024, 49(17): 38-43.  DOI: 10.16638/j.cnki.1671-7988.2024.017.008 Abstract ( )   PDF (1873KB) ( )   In order to improve the handling stability of Baja race car, this paper optimizes and analyzes the suspension system of the four-wheel-drive Baja race car. First, according to the overall design parameters of Baja race car, the types of front and rear suspensions are selected, the main parameters of the suspension are calculated, and the spatial positions of the suspension hard points are determined. On this basis, the kinematics simulation models of the front and rear suspensions are established using ADAMS/Car, and the change rules of the vehicle positioning parameters and their influence on the handling stability are analyzed. According to the simulation results, the suspension hard points are optimized using the ADAMS/Insight module, and the suspension parameters that meet the design requirements are obtained. The results indicate that the research method proposed in this paper can effectively optimize the design of the suspension system for Baja race cars and can also provide certain ideas for improving the handling stability of the race cars. References | Related Articles | Metrics

Select

Design and Development of Multi-functional Vehicle Electrical Test Bench SHI Tianyu, XU Changzhao 2024, 49(17): 44-49.  DOI: 10.16638/j.cnki.1671-7988.2024.017.009 Abstract ( )   PDF (1080KB) ( )   This paper focuses on the design and development of multi-functional vehicle electrical test bench. In view of the defects of single function and poor expansibility of the existing automotive electrical test bench, an innovative design scheme with multi-function, modularity and high integration is proposed. This scheme focuses on the design and development of multifunctional automotive electrical test bench, integrates advanced control technology, builds flexible hardware architecture, and configs customizable software system, so as to detect and simulate automotive electrical system in an all-round way. In the process of design and development, it focuses on the simulation of the response and protection mechanism of automotive electrical appliances under various overload conditions. With the carefully built platform structure and control system, the overload state of automotive electrical appliances can be accurately simulated and monitored in real time. In this paper, not only the function characteristics of the experimental bench are detailed, but also the use method and application scenario are clearly described. The successful research and development of this experimental bench plays a vital role in enhancing the research and development efficiency of automotive electrical systems, reducing research and development costs and optimizing product quality, and provides valuable reference experience for related fields. References | Related Articles | Metrics

Select

Performance Optimization and Lightweight Design of Automotive Lower Control Arm CHEN Zhiyang, HU Li, ZHANG Guiyin* , LIU Hui, ZHANG Jianhua, CHEN Zhengkang, LI Ying 2024, 49(17): 50-54.  DOI: 10.16638/j.cnki.1671-7988.2024.017.010 Abstract ( )   PDF (2238KB) ( )   The lower control arm needs to have a certain strength and stiffness to resist extrusion, impact deformation, and also needs to have a high natural frequency to avoid low-frequency resonance and noise. Taking the lower control arm of a research automotive as the lightweight design object in this paper, the design risk of insufficient buckling force is identified through simulation analysis, and the control arm is redesigned using a combination of shape and topology optimization methods, and performance simulations are conducted on the new design. The results show that the new control arm eliminated the design risk of insufficient buckling force, resulting in 6.6% weight reduction compared to the original design. This paper adopts linear optimization method to solve the highly nonlinear buckling force optimization problem, identifies the load transmission path through topology optimization, and provides new ideas for the buckling force optimization and lightweight design of automotive control arms. References | Related Articles | Metrics

Select

Research on Low Wind Resistance Characteristics in Automobile Styling Design FU Jianbo, ZHANG Jun, WANG Dapeng 2024, 49(17): 55-59.  DOI: 10.16638/j.cnki.1671-7988.2024.017.011 Abstract ( )   PDF (2753KB) ( )   With the continuous popularization of new energy vehicles, battery life has always been the focus of people's attention. Reducing the air resistance during driving can effectively improve its range, and how to maximize the reduction of air resistance is the direction that the styling design field is constantly researching. This article first elaborates on the importance of car styling design and its relationship with air resistance, and then focuses on exploring the ideas and methods of maximizing the reduction of air resistance in the styling design process. That is, continuously optimizing and improving the styling features and conducting computer aided engineering (CAE) simulation analysis under the premise of meeting the styling design intention, and obtaining the final improvement plan through comparative analysis of CAE simulation results. At the same time, the main influencing factors of air resistance in styling design are summarized, and low wind resistance characteristics and recommended values are extracted, providing valuable experience and technical support for subsequent product styling design work. References | Related Articles | Metrics

Select

Design and Optimization of FSC Racing Car Aerodynamics Kit FAN Jiaxu, LIU Shuyi* , BAI Hongfei, TANG Zhanyi, ZHANG Hongpeng 2024, 49(17): 60-64.  DOI: 10.16638/j.cnki.1671-7988.2024.017.012 Abstract ( )   PDF (1638KB) ( )   This paper mainly introduces the design and optimization process of the aerodynamic kit of the formula student China (FSC) racing car. For the Wonder-E05 racing car of Liaoning University of Technology, the aerodynamic characteristics of the racing car under different working conditions are studied through computational fluid dynamics (CFD) simulation analysis. The results show that by analyzing the change of the body attitude under the pitch condition, it is found that the front wing design is sensitive to the change of ground clearance, which makes the aerodynamic characteristics of the vehicle change significantly under the pitch condition, and the front wing can be equipped with high ground clearance and large angle of attack flaps are used to reduce the ground clearance sensitivity of the front wing. The research results can provide design ideas for the vehicle design in the subsequent racing car design, and reduce the influence of ground clearance on the aerodynamic sensitivity of the vehicle. References | Related Articles | Metrics

Select

Design and Matching of Double-front-axle Electric Steering System for Commercial Vehicle WANG Yin, MA Xiangfei, GUO Zhilong, LU Wei 2024, 49(17): 65-69.  DOI: 10.16638/j.cnki.1671-7988.2024.017.013 Abstract ( )   PDF (1373KB) ( )   In order to optimize the layout of the two-axle electric steering system and ensure the coordinated movement of axes I and II, this paper takes a multi-axle commercial vehicle as the research object, discusses a matching calculation method of electric steering gear and electric push rod, and conducts motion simulation analysis of steering system rod mechanism based on CATIA/DMU module, accurately grasp the motion law of steering ladder and transmission system, and obtains the optimal layout scheme of steering transmission system. This method can avoid the later design changes caused by unreasonable parameter design, so as to shorten the development cycle and reduce the development cost and risk. References | Related Articles | Metrics

Select

Requirements and Stiffness Analysis for Package of Automotive Air Outlet CUI Jinli 2024, 49(17): 70-73.  DOI: 10.16638/j.cnki.1671-7988.2024.017.014 Abstract ( )   PDF (1464KB) ( )   The automotive air outlet is an important functional component of the interior system, and its design directly affects the market recognition of the model. First of all, the paper focuses on the man-machine layout requirements of automotive air outlet in the design and development process, including the layout position of the front air outlet on the instrument panel, the up and down angle of the front air outlet, the left and right angle of the front air outlet, the layout position of the rear air outlet and the hand operation space of the air outlet; secondly, through these layout requirements, whether the design of the air outlet can meet the man-machine requirements can be checked, and the robustness of the design can be verified by various physical experiment methods; finally, the stiffness of the air outlet blade is calculated by using the commonly used finite element analysis software HyperMesh and Abaqus. The deformation of the air outlet blade under 22 N load is 0.982 mm, which meets the company's specification requirements. References | Related Articles | Metrics

Select

Research on Control Strategy of Intermediate Shaft Brake Based on BP Neural Network WANG Xin, LIU Dan, SHI Zhaozhuo* , PAN Jianbin, DENG Jingzhe 2024, 49(17): 74-77,154.  DOI: 10.16638/j.cnki.1671-7988.2024.017.015 Abstract ( )   PDF (1787KB) ( )   The middle shaft brake is a key component of the automated manual transmission (AMT), which is mainly used for gear shifting during the driving process to achieve a smoother driving experience. Back propagation (BP) neural network is a proxy mathematical model that can adaptively adjust parameters and optimize weights. During gear shifting of an AMT, power interruption may occur, and the duration of the power interruption affects the driving comfort of the vehicle. This article analyzes the gear shifting control strategy and the related parameters affected by the middle shaft brake working time. It is found that there are nonlinear relationships and multiple influencing factors in this control process. Therefore, it is proposed to use BP neural network to establish a prediction model to predict the middle shaft brake time, and achieve more precise and sensitive control of the middle shaft brake, thereby achieving better shifting effect. References | Related Articles | Metrics

Select

Simulation Analysis of the Flow Field in the Intake and Exhaust Ports of a Certain Car Engine ZHOU Huan, XIONG Siqin, XIAO Yao, SU Shijian 2024, 49(17): 78-82.  DOI: 10.16638/j.cnki.1671-7988.2024.017.016 Abstract ( )   PDF (2355KB) ( )   The original air duct of a certain car engine has a relatively simple structure and there is no smooth transition at the junction of the inlet and outlet sections of the air duct, resulting in significant cross-sectional shrinkage and increased gas flow loss. We are now analyzing and adjusting the engine characteristic parameters to increase engine power and reduce engine fuel consumption. This article has made a preliminary modification to the original intake and exhaust duct model. After raising the protrusions where the intake and exhaust valve ducts are located by 2 mm, there is not much difference in the simulation results of the flow field between the intake and exhaust ducts and the original engine. The flow rate of the intake and exhaust ducts is only increased by about 1%, and the effect of improving the flow rate of the exhaust duct is slightly better. Therefore, in order to significantly improve the inflation efficiency and engine performance, it is necessary to improve the overall geometric structure of the duct. Therefore, this article has redesigned three schemes for the intake duct structure. From the calculation results, it can be seen that each scheme has a significant increase in intake flow rate, which can support the improvement of engine power. The analysis and research in this article can reduce oil consumption and improve the combustion efficiency of automotive engines. References | Related Articles | Metrics

Select

Research and Application of Magnetorheological Damping Technology ZHANG Weiqin, DU Jinzhi, HU Qunlin, LIU Hailiang 2024, 49(17): 83-87.  DOI: 10.16638/j.cnki.1671-7988.2024.017.017 Abstract ( )   PDF (1166KB) ( )   Magnetorheoloical damping technology, as an advanced semi-active control technology for automotive suspensions, has received widespread attention over the past few decades. This study aims to explore the application of magnetorheological damping technology in automobile suspension systems to enhance vehicle stability and comfort during driving. By analyzing the working principle of magnetorheological fluid and its rapid response capability under magnetic fields, an automotive shock absorber based on magnetorheological damping technology is designed. Laboratory tests are conducted according to automotive shock absorber performance testing standards, along with subjective evaluations of automobile handling and stability performance. The results indicate that the magnetorheological damper can effectively and rapidly adjust the damping force, adapting in realtime to road conditions, significantly reducing vehicle body vibrations, and improving driving comfort, showcasing a clear performance advantage over traditional shock absorbers. This study validates the effectiveness of magnetorheological damping technology in enhancing automobile performance, providing theoretical support for further product development and bulk automotive applications. References | Related Articles | Metrics

Testing and Experiment

Select

Research on Field Vehicle-in-the-Loop Simulation Test System and Bus Injection TANG Yichao1 , SONG Yongxiong2 , PAN Deng2 , WU Dongbo2 , MENG Zhangjie1 , HE Bing2 , LU Bin2 2024, 49(17): 88-94.  DOI: 10.16638/j.cnki.1671-7988.2024.017.018 Abstract ( )   PDF (2343KB) ( )   The field vehicle in-the-loop simulation test system combines the real dynamics of real vehicle testing with virtual scene simulation technology, which is characterized by high test realism, diversified test scenarios and high test safety. This paper firstly introduces the field vehicle in-theloop simulation test system and its sub-system composition, secondly proposes a detailed design for the bus data injection subsystem, and then builds a vehicle field in-the-loop simulation test system based on this design, carries out the field real-vehicle test and the simulation scenario test, and finally carries out the comparative analysis of the test data, which verifies the high realism and high reproducibility of the test system. In the article, an optimized design of the bus data injection subsystem is provided to ensure that the system improves the scalability and portability of the whole test system under the premise of maintaining a high degree of realism and high reproducibility, which provides an important reference for the future industry to develop a field vehicle inthe-loop simulation test system. References | Related Articles | Metrics

Select

Free Modal Analysis and Test Based on FSAE Frame WU Chenyu, ZHONG Zipeng, QUAN Shuanglu* , HU Gailing, ZHANG Haixia 2024, 49(17): 95-98.  DOI: 10.16638/j.cnki.1671-7988.2024.017.019 Abstract ( )   PDF (1818KB) ( )   To ensure the stability and reliability of the formula SAE (FSAE) frame in practical applications, while achieving lightweight design and meeting stringent safety standards, the design team utilizes three-dimensional design software CATIA to construct the frame model. Subsequently, finite element analysis is conducted in ANSYS software to predict the dynamic response of the frame under various conditions. By accurately constructing the three-dimensional model of the frame and setting appropriate material properties and boundary conditions, the natural frequency and vibration modes of the frame are obtained. To verify the accuracy of the simulation results, modal testing is also performed to measure the vibration response of the frame, and the experimental data are compared and analyzed with the simulation outcomes. The test results confirm the precision of finite element analysis in predicting the free modal characteristics of the frame, validate the effectiveness of the adopted analytical methods, and provide a solid theoretical foundation for further optimization of the frame design. References | Related Articles | Metrics

Select

Failure Ananlysis of Cylinder Head Gasket of Diesel Engine ZHANG Yujuan, YIN Huiqiong, FENG Hui, LU Jian, MA Le, WANG Decheng 2024, 49(17): 99-102.  DOI: 10.16638/j.cnki.1671-7988.2024.017.020 Abstract ( )   PDF (1928KB) ( )   According to the batch leakage failure of cylinder head gasket of a diesel engine in the market, the failure mode of the cylinder head gasket is confirmed as cracking by analyzing the failure parts. Based on the data measurement and analysis from 4 aspects of cylinder head lift, cylinder head bolt shaft force, cylinder liner bulge and gasket structure, and combined with the simulation analysis method, it is found that the gasket structure design is the main cause of the failure, and further put forward the improvement measures to optimize the distance between upper and lower gaskets. After the full load endurance test and thermal shock test, the improved diesel engine does not appear gasket cracks and leakage failures, successfully solves the market problems, and provides a reference for the subsequent cylinder head gasket design. References | Related Articles | Metrics

Select

Optimization of Powertrain Mounting Performance of a Pickup Truck LI Shaotao1 , YANG Nianjiong*1 , REN Lei2 , YANG Yihao1 , MENG Haowei1 2024, 49(17): 103-108.  DOI: 10.16638/j.cnki.1671-7988.2024.017.021 Abstract ( )   PDF (1945KB) ( )   The powertrain mounting system is a key factor affecting the vibration response in the vehicle and is an important part of the noise, vibration, harshness (NVH) performance tuning. In order to study the problem of excessive idle vibration of the steering wheel during the subjective evaluation of a pickup truck, it is found that the powertrain excitation could not be effectively attenuated due to the insufficient vibration isolation capacity of the powertrain mount, which caused the excessive vibration of the steering wheel. To solve this problem, the powertrain mounting system of the sample vehicle is developed and the decoupling rate is taken as the optimization goal, based on the non-dominated sorting genetic algorithm (NSGA-II) optimization algorithm and energy decoupling method, iSIGHT and MATLAB are used to carry out co-simulation. The vibration isolation performance of the engine mount is optimized, and the optimization verification is carried out in combination with the real vehicle, and the vibration isolation of the optimized rear suspension system basically reached 20 dB, and the subjective evaluation of steering wheel vibration is acceptable. This research method has certain guiding significance for the development of NVH of prototype vehicles. References | Related Articles | Metrics

Select

Reliability Analysis of Electric Drive Axle Based on Fuzzy Fault Tree FU Qiang 2024, 49(17): 109-114.  DOI: 10.16638/j.cnki.1671-7988.2024.017.022 Abstract ( )   PDF (2335KB) ( )   For solving the problem of insufficient basic event failure rate in fault tree analysis, a fuzzy fault tree analysis method is proposed in analyzing complex systems. By converting expert judgments into specific fuzzy probability values, the probability of basic events occurring is determined, and the probability of the top event and critical importance of the fault tree are calculated. Taking the electric drive axle system of heavy-truck as an example, by establishing a fault tree for electric drive axle not working, and through quantitative analysis of fuzzy fault tree, the key fault factors affecting system reliability are confirmed, and provides certain reference value for relevant workers. References | Related Articles | Metrics

Select

Research on Optimization of High-speed Rumble Sound of a Battery Electric Micro-truck JIAO Anyong, SUN Yang, ZHANG Bin 2024, 49(17): 115-120.  DOI: 10.16638/j.cnki.1671-7988.2024.017.023 Abstract ( )   PDF (3354KB) ( )   In order to resolve the problem of low-frequency rumble sound of a battery electric micro-truck at high speed, identified the characteristics and generation mechanism of the sound through computational fluid dynamics simulation and road test. The high-speed air enter the cavity of the air deflector through the gap between the container and cab, which exciting the self-excited oscillation and acoustic resonant coupling, which causes low frequency and high energy characteristics sound pressure inside the cab. The engineering scheme for optimizing the shape of the air deflector is finally determined by verifying the schemes of body structure strengthening, acoustic package coating, cargo compartment clearance adjustment, and shape optimization of the air deflector. According to the road test and evaluation of the actual vehicle, compared with the original basic state, the noise of the right ear in the 80～120 Hz frequency band is reduced by about 3.9 dB(A), and the problem is solved and it provides a reference for the subsequent aerodynamic noise optimization. References | Related Articles | Metrics

Select

Discussion on the Speed of Car Collision Electric Two-wheeler Based on Mechanical Characteristics XIE Li 2024, 49(17): 121-125.  DOI: 10.16638/j.cnki.1671-7988.2024.017.024 Abstract ( )   PDF (1049KB) ( )   According to the mechanical characteristics and principles in this paper, the instantaneous speed determination of car collision in the traffic accident of car collision with electric two-wheeler is studied. Aiming at the different collision forms and angles between car and electric two- wheeler, the formula for calculating car speed at the moment of collision is given based on the principle of mechanical characteristics and the experience of related experiments. The content of this paper provides a more practical speed calculation method for the division of the traffic accident responsibility of the car collision with the electric two-wheel vehicle, in order to solve the problem of collision speed, play a helpful and enlightening role. References | Related Articles | Metrics

Select

Fatigue Life Analysis and Test of Steel-aluminum Composite Sub-frame LIN Yuheng 2024, 49(17): 126-130.  DOI: 10.16638/j.cnki.1671-7988.2024.017.025 Abstract ( )   PDF (4610KB) ( )   In order to establish the finite element model of steel-aluminum composite sub-frame accurately and use it for fatigue life analysis, the sub-frame of a hybrid steel-aluminum composite cleaning vehicle is taken as the research object to model in this paper. The rigid element method is selected to simulate the bolted connection of steel and aluminum parts, and the corresponding tests are designed to verify the accuracy. The results show that the method is accurate and reliable in simulation analysis. In this way, a more accurate finite element model for fatigue life analysis of steel-aluminum composite sub-frame is established, and the overall fatigue life of the structure basically met the preset safety life standard through simulation analysis and solution, which confirmed the accuracy of the finite element modeling method. References | Related Articles | Metrics

Process·Materials

Select

Analysis of Particle Defects in Painted Body and Quality Improvement YANG Jiankang, DONG Nan, LI Jifei, GUO Pingsheng, YUAN Qingzhu 2024, 49(17): 131-135,172.  DOI: 10.16638/j.cnki.1671-7988.2024.017.026 Abstract ( )   PDF (1229KB) ( )   This article analyzes the electrophoretic and topcoat particles generated on the surface of the car body from several aspects, including pre-treatment equipment, process parameters, personnel operation, and production process, based on the particle problem of the painted car body of our company's light passenger series models, and discusses their adverse effects. And process validation analysis is conducted on how to reduce the electrophoretic and topcoat particles on the surface of painted car bodies. Effective control of the occurrence of car body particles is achieved through optimizing the production process flow, pre-treatment tank liquid guide groove, personnel training, and clean workshop environment. Ultimately, the polishing amount of car body particles is significantly reduced, and methods for reducing the effect of car body particles are summarized, and this method has achieved good results in the actual production process, laying a solid foundation for the subsequent production of high-quality products. References | Related Articles | Metrics

Select

Feasibility Study on Aluminization of Truck Door Outer Panels XIE Yi, CHEN Wenjuan, YAO Yulong 2024, 49(17): 136-139.  DOI: 10.16638/j.cnki.1671-7988.2024.017.027 Abstract ( )   PDF (2756KB) ( )   In recent years, with the high-end transformation of the truck industry, the market's requirements for truck lightweight have become one of the important technological breakthrough directions, and the research on aluminum alloy material substitution without changing the original body manufacturing system has become a hot topic. How to more effectively control the cost of trial production and verification, and reduce the initial investment cost and process verification cycle of the mold as much as possible, is the key concern of the lightweight project. Computer aided engineering (CAE) forming analysis technology is used to analyze the forming process of aluminized parts in this paper, and the empirical process plan is revised through the results of virtual verification, and on this basis, the stamping process parameters are fine-tuned in combination with a small range of trial and error verification on the production site, so as to realize the small sheet cost of the aluminized outer plate of a light truck door, that is, the parts that can be used for product test and evaluation are trial-produced. With the application of such methods in the trial production process of door outer panels, it provides a reference experience for the feasibility demonstration of various types of aluminized shallow drawing parts. References | Related Articles | Metrics

Automobile Education

Select

Reformation and Implementation of Vehicle Engineering Major Experimental Curriculum Based on Engineering Education Certification DU Juan, LIU Xiaodong, ZHAO Ling, LIU Wenting, WEI Yanxia 2024, 49(17): 140-145.  DOI: 10.16638/j.cnki.1671-7988.2024.017.028 Abstract ( )   PDF (1685KB) ( )   The vehicle engineering major cultivates automotive professionals for enterprises, universities and research institutes, and its professional experimental curriculum Automotive Struc ture and Performance Experiment is a compulsory basic practical course. Based on the concept of engineering education certification and the current situation of experimental teaching, this paper proposes a teaching system of "three platforms, three combinations and three levels", and optimizes and improves it from four aspects: teaching objectives, teaching content, teaching methods, teaching evaluation and assessment. Practice shows that the reform can greatly improve students' learning initiative, cultivate students' ability to use knowledge comprehensively, solve complex engineering problems, and effectively improve the quality of talent training. References | Related Articles | Metrics

Select

Design and Teaching Application of Fault Setting Box for Volkswagen Bora Automotive Engine Control System WU Kejia, CHEN Huigan, LIN Fenggong, SU Chunjin, SUN Shuai 2024, 49(17): 146-149.  DOI: 10.16638/j.cnki.1671-7988.2024.017.029 Abstract ( )   PDF (1944KB) ( )   In order to effectively improve the school's new energy automotive professional group teachers, students on the automotive engine electronic control system fault repair practice level, this article takes Volkswagen Bora as the carrier, and teachers and students jointly research and design a set of engine electronic control system teaching fault setting boxes to facilitate teachers' practical teaching and students' skill competition training. This fault setting box can flexibly set circuit breaks, short circuits, swapping, virtual connections, etc., simulating the real fault repair process. Its design process is as follows: firstly, based on the Volkswagen Bora circuit diagram, sort out the engine computer board harness; secondly, design the size of the fault setting box and the layout of the pins; then, weld the wire harness onto the computer board and check its conductivity after the wire harness welding is completed; finally, the teaching vehicle with a fault setting box is functionally validated against the original vehicle to verify the effectiveness of the designed teaching vehicle fault setting box. References | Related Articles | Metrics

Select

Research on the Innovation of Talent Training Mode of Applied Undergraduate Vehicle Engineering Specialty KANG Xiaopeng, WANG Xiaolong, QI Chuanqi 2024, 49(17): 150-154.  DOI: 10.16638/j.cnki.1671-7988.2024.017.030 Abstract ( )   PDF (1214KB) ( )   Taking the vehicle engineering major of Chengdu University as an example, this paper discusses the reform measures for talent cultivation model in application-oriented universities under the background of rapid development of new energy vehicle industry. The reform of the training mode of vehicle engineering professionals is the key to deal with the transformation and upgrading of the automobile industry. As a local university, Chengdu University faces both opportunities and challenges. The general idea of innovative talent training mode is put forward, including optimizing the curriculum system, strengthening the construction of teaching staff and stimulating the vitality of students. Through exploration and attempt, the vehicle engineering major of Chengdu University has achieved remarkable results in improving students' employment rate and postgraduate entrance examination rate. References | Related Articles | Metrics

Select

Reform of Traffic Accident Scene Tnvestigation Training Course Based on OBE Concept WANG Hepeng, SUN Jiamei, ZHAO Xueming 2024, 49(17): 155-158.  DOI: 10.16638/j.cnki.1671-7988.2024.017.031 Abstract ( )   PDF (1297KB) ( )   In order to provide high-quality and skilled talents for the automotive aftermarket, relevant majors in vocational colleges need to adapt to the development of the times, adapt to the characteristics of modern students, and improve teaching quality. The implementation of practical training course teaching is a key link to ensure the quality of education. The introduction of outcome based education (OBE ) concept into the teaching of vocational education training courses can better solve the problems existing in traditional practical training and teaching. This paper integrates the course of Traffic Accident Scene Investigation and Training into the teaching reform practice of OBE concept, resets the teaching objectives, optimizes the teaching content, develops new teaching methods, and explores the specific implementation of multi-dimensional teaching evaluation, so that the teaching quality has been further improved, and provides a reference path for the teaching reform of vocational education. References | Related Articles | Metrics

Select

An Analysis on the Integrated Curriculum Reform Method of "Post Course Competition Certificate" for Automotive Maintenance Major in Higher Vocational Colleges under the Background of Intelligent Network Connection WANG Zhenyuan, ZHANG Wenhui, PAN Peng, CHENG Xiangnan 2024, 49(17): 159-163.  DOI: 10.16638/j.cnki.1671-7988.2024.017.032 Abstract ( )   PDF (1007KB) ( )   Intelligent interaction technology, as one of the core technologies of intelligent connected vehicle, is an important part of promoting the development of intelligent connected vehicle technology. How to train intelligent interactive technology developers with innovative ability and adapt to the rapid development of interactive technology between intelligent networked vehicles and between vehicles and the environment is an important challenge for automotive maintenance majors in higher vocational colleges. In this context, combining with the training needs of high-quality engineering and technical talents in the intelligent era, this paper analyzes and explores how to promote the integration course of "post course competition certificate" for automotive maintenance major in higher vocational colleges under the background of intelligent network connection. In order to play the value role of the integration teaching mode of "post course competition certificate" and promote the curriculum reform of automotive major in higher vocational colleges, this paper summarizes the integration mode of "post course competition certificate". This paper expounds the changes of the integration course of "post course competition certificate" for higher vocational automotive major in the new era, and probes into the reform method of the integration course of "post course competition certificate" for higher vocational automotive major from the aspects of personnel training objectives, personnel training mode, curriculum system, teaching implementation and teaching evaluation system. References | Related Articles | Metrics

Standards·Regulations·Management

Select

Management Innovation and Practice of R&D Laboratory in Automobile Manufacturing Enterprise DONG Weiwei, SONG Weiwei* , ZHAO Jian, JIN Aiwei, WANG Meng 2024, 49(17): 164-167.  DOI: 10.16638/j.cnki.1671-7988.2024.017.033 Abstract ( )   PDF (1036KB) ( )   In automobile manufacturing enterprises, the R&D center laboratory plays an important role in raw material testing, production quality control, compulsory items pre-testing and after-sales quality problem analysis. With the development of the company and the increase of production, the R&D center laboratory encountered challenges in test tasks, equipment maintenance, personnel skills, consumable spare parts and integrated business management, and achieved good results through the implementation of targeted management innovation measures. This paper summarizes the management innovation practice of laboratory in personnel, equipment and consumable spare parts, in order to provide reference for similar laboratory management in automobile manufacturing industry. References | Related Articles | Metrics

Select

Thermal Runaway Testing and Standards Analysis for Power Li-ion Batteries in Electrical Vehicle WU Guangshun, LI Zhentie, WANG Hao 2024, 49(17): 168-172.  DOI: 10.16638/j.cnki.1671-7988.2024.017.034 Abstract ( )   PDF (1210KB) ( )   The safety of li-ion batteries is a major challenge in the development of large-scale applications of power batteries in electric vehicles. Thermal runaway can lead to safety hazards include smoke, fire or explosion. Batteries safety testing is the main method to help reducng the thermal runaway threat. Chinese and international standards of thermal runaway testing standards for li-ion power batteries are reviewed. Testing items such as overcharging, forced discharge, external short circuit, heating and temperature shock, and crush (or collision) are analyzed, the test conditions and parameters in GB 38031－2020, UL 2580－2020, and UN/ECE R 100.02－2013 are discussed. This study briefly summarize the characters and shortcomings of those standards. It is hope to contribute to the continuous updating and optimization for batteries safety standards, and a more scientific testing and evaluation method can be established. References | Related Articles | Metrics