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14 December 2023, Volume 48 Issue 23 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management


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New Energy Vehicle

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Research on Power System Optimization Control of Distributed Drive Electric Vehicle LUO Liangquan 2023, 48(23): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2023.023.001 Abstract ( )   PDF (772KB) ( )   In view of the redundant structure of the distributed four-wheel drive system of electric vehicle, the power control between the driving wheels is prone to interference coupling effect, so the power optimization control system of the four-wheel drive of electric vehicle is established. Combined with MATLAB and CarSim, the vehicle dynamics model and motor drive coordination optimization control model are established, including the upper control layer for calculating driving demand force and generalized stable yaw moment. By comparing the torque distribution control layer with the non-dynamic control system, the correctness and effectiveness of the optimized dynamic control system are verified, and the adaptive performance of the control system is better. References | Related Articles | Metrics

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The SOC Estimation Based on Improved Extended Kalman Filter Algorithm HU Kun 2023, 48(23): 6-13.  DOI: 10.16638/j.cnki.1671-7988.2023.023.002 Abstract ( )   PDF (1234KB) ( )   In the fields of electric vehicles, energy storage systems and mobile devices, the battery management system is one of the key technologies to ensure the performance and safety of the battery pack. The state of charge (SOC) is estimated to be an important part of it. The research of the article focuses on the lithium-iron phosphate battery of 18650 models, which is based on the estimation of the SOC of the single battery. First of all, select the dual-order remote control (RC) model as the battery model and determine the dynamic parameters of the dual-order RC model through the battery capacity calibration experiment, the open circuit voltage (OCV)-SOC calibration experiment and the hybrid pulse power characteristic (HPPC) experiment. The power battery simula- tion model is built in MATLAB/Simulink, and the reliability of the selected model is verified. Then, in order to solve the problem of accuracy and cost of the single battery SOC estimation, based on the extended Kalman filter (EKF) algorithm, a improvement method is proposed, that is, the time- varying fade factor is introduced when predicting the error covariance matrix of the time step k, and the adaptive molecule is introduced when the variance Q and R are updated. Finally, the simulation analysis of the proposed algorithm is carried out under different cyclic conditions. Through comparison, the proposed algorithm improves the accuracy of SOC estimation and has strong practicality. References | Related Articles | Metrics

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Research on New Energy Vehicle Infrastructure Construction in Heze under the Background of "Double Carbon" LI Kun 2023, 48(23): 14-18.  DOI: 10.16638/j.cnki.1671-7988.2023.023.003 Abstract ( )   PDF (552KB) ( )   The "double carbon" goal has become a long-term national strategy, new energy vehicles have ushered in development opportunities, and urban low-carbon environmental protection will also enter a new stage. As an important facility for energy supply, new energy vehicle charging infras- tructure plays a key role in the promotion of new energy vehicles and plays an important role in urban planning and construction. At present, there are a series of problems in the construction and operation of the city's supporting charging infrastructure, which hinder the popularization and development of new energy vehicles. This paper analyzes and discusses the current situation of new energy vehicle charging infrastructure construction in Heze, and explores the effective path to strengthen the construction of new energy vehicle infrastructure. References | Related Articles | Metrics

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The Analysis of Extreme Energy Consumption in Battery Electric Vehicle Operating Conditions Based on Vehicle Energy Flow Theory JI Mengyuan 2023, 48(23): 19-25.  DOI: 10.16638/j.cnki.1671-7988.2023.023.004 Abstract ( )   PDF (931KB) ( )   In the analysis of braking energy recovery, the control strategy of braking energy recovery and testing of braking energy recovery are mostly studied, but the theoretical limits of vehicle energy consumption, braking energy recovery and effective energy recovery of the vehicle are not evaluated. Based on the theory of vehicle energy flow, the energy flow path of battery electric vehicle is sorted out, and the interrelationships between factors such as vehicle driving resistance, vehicle inertia potential energy, braking energy recovery, and motor efficiency in energy consumption calculation are sorted out, and the interrelationships are transformed into a calculation model to solve the theoretical limit values of energy consumption, braking energy recovery rate, and effective energy recovery rate of the entire vehicle under working conditions. The actual measurement results of a battery electric box transport vehicle indicate that the theoretical limit values of the energy consumption and effective energy recovery rate of the entire vehicle are within 2% of the actual deviation, and the limit values of the braking energy recovery rate are within 6% of the actual deviation. The calculation model is relatively accurate, and this provides a theoretical basis for reducing vehicle energy consumption, optimizing brake energy recovery control strategies, and balancing passenger comfort with brake energy recovery intensity. References | Related Articles | Metrics

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Estimation of Electric Vehicle Power Battery State of Charge QIU Zhipeng 2023, 48(23): 26-30.  DOI: 10.16638/j.cnki.1671-7988.2023.023.005 Abstract ( )   PDF (1171KB) ( )   Accurate and reliable estimate of the state of charge has a pivotal impact on the performance of electric vehicles, thus becoming an important research direction for scholars at home and abroad. This paper chooses ternary lithium-ion battery as the research object, and then introduces several estimation methods of charge state. Model based method is chosen to estimate charge state, and first-order Thevenin model is constructed. Then the function correspondence of open circuit voltage- state of charge (OCV-SOC) is constructed by using the data of charge and discharge experiment and polynomial fitting tool in MATLAB. The parameter values in the model can be identified offline by using the least square method, and then the adaptive extended Kalman filter (AEKF) algorithm is used to estimate the state of charge of lithium-ion batteries. Then the dynamic stress test (DST) experiment is carried out, and the extended Kalman filter (EKF) algorithm and AEKF algorithm are compared and the error is analyzed, so as to check the accuracy of AEKF algorithm. Finally, through the experimental data, it can be concluded that the AEKF algorithm introduced in this paper can ensure a satisfactory accuracy in the estimation of the DST experimental conditions, and this algorithm is not very complicated and has strong operability. References | Related Articles | Metrics

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Batch Application of Nylon Tube in New Energy Vehicle Cooling System ZHANG Chongzi 2023, 48(23): 31-35.  DOI: 10.16638/j.cnki.1671-7988.2023.023.006 Abstract ( )   PDF (1848KB) ( )   With the rapid development and popularization of new energy vehicles, the lightweight technology of automobiles has also received more and more attention. Due to its light weight and simple processing technology, nylon tube has gradually become the main material used in cooling pipelines, it is very suitable for the application of new energy vehicle cooling system. The article introduces the three technical routes of cooling water tubes, the comparison of the use of three materials, and the comparison of the advantages and disadvantages of the hose and nylon tube solutions. For example, by comparing a rubber water tube and a nylon water tube scheme for new energy vehicles, the lightweight results of the batch adoption of the nylon tube solution are illustrate. Finally, the design precautions of nylon tubes are discussed, which provides reference and reference significance for the design and production of similar models. References | Related Articles | Metrics

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Analysis of Electrical Power Steering PDC Function Principle and Optimization on Pull to Right Issue of Vehicle LIU Xiaoyun 2023, 48(23): 36-40.  DOI: 10.16638/j.cnki.1671-7988.2023.023.007 Abstract ( )   PDF (979KB) ( )   Vehicle running off is a common failure mode that affects vehicle performance. According to the vehicle running and deviation characteristics, three stages of pull drift compensation (PDC) function scene identification, compensating torque calculation and PDC compensating torque output are proposed. The test indexes time to drift (TTD) and torque to track (TTT) are included into the performance indexes of PDC function acceptance. The contribution of PDC function to the optimization of deviation problem is expounded and demonstrated, which has certain engineering application value. References | Related Articles | Metrics

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Behavioral Characteristics Analysis of New Energy Vehicle Users in the Private Sector WANG Xing 2023, 48(23): 41-45.  DOI: 10.16638/j.cnki.1671-7988.2023.023.008 Abstract ( )   PDF (831KB) ( )   With the rapid development of new energy vehicles and the continuous expansion of market size in China, the study of user behavior characteristics of new energy vehicles in the private sector has become a focus of attention for various mainstream enterprises. This paper investigates the behavioral characteristics of new energy vehicle user groups in the private sector through the principle of random sampling in the form of online questionnaires, and obtains the demography characteristics of users and the behavioral characteristics of vehicle purchase, use and charging, which provides a certain reference for the product positioning and marketing of enterprises. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on the Construction of Intelligent Connected Vehicle in Vocational Colleges ZHU Zuwei 2023, 48(23): 46-49.  DOI: 10.16638/j.cnki.1671-7988.2023.023.009 Abstract ( )   PDF (858KB) ( )   Intelligent connected vehicle has become an important development direction of automobile. Therefore, we should cultivate high-quality skilled personnel who can meet the development needs of intelligent and connected automobiles, it is extremely urgent for vocational colleges to set up and build the specialty of intelligent connected vehicle in time. This paper analyzes the demand for talents from the development of the intelligent connected vehicle industry, we will focus on interdisciplinary talents, skilled talents in the whole industry chain and quality talents in soft and hard mergers about intelligent networked vehicles, and explore how to cultivate such talents in the construction of the specialty of intelligent networked vehicles. Then it can better promote the rapid development of the intelligent connected vehicle industry and provide reference for training high-quality skilled personnel. References | Related Articles | Metrics

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Improved Obstacle Avoidance Trajectory Planning by Artificial Potential Field Method GE Tian 2023, 48(23): 50-55.  DOI: 10.16638/j.cnki.1671-7988.2023.023.010 Abstract ( )   PDF (1219KB) ( )   Obstacle avoidance trajectory planning is an indispensable part of the autonomous technology, which is related to the safety of the vehicles. In this paper, the trajectory planning method based on artificial potential field is mainly studied, aiming at the inherent defects such that local optimization and unreachable target, considering that the longitudinal change ability of vehicles traveling on structured roads is much greater than that of horizontal. An improved method of potential field distribution based on Frenet coordinate is proposed, which scales the potential field proportionally along the horizontal, so as to avoid the unstable or even planning failure caused by the superposition of multiple potential fields when the host vehicle is detouring the borrowing road. Aiming at the local optimal problem, an escape trajectory planning method based on safety corridor is established. When the host vehicle falls into the unattainable target situation, the vehicle will be guided to plan the optimal scheme by dynamically adjusting the potential field. Finally, the proposed improvement scheme is simulated and verified under different traffic scenarios, and the results show that the proposed scheme can effectively improve the performance of the artificial potential field method. References | Related Articles | Metrics

Design and Research

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Research on LQG Control of Active Suspension Based on Chaotic Particle Swarm Optimization CHEN Chen 2023, 48(23): 56-62.  DOI: 10.16638/j.cnki.1671-7988.2023.023.011 Abstract ( )   PDF (1592KB) ( )   In response to the shortcomings of relying on experience to determine the weight coefficients in the active suspension linear quadratic gaussian (LQG) control algorithm, a particle swarm optimization algorithm is used to optimize the parameters of the LQG algorithm offline. However, traditional particle swarm optimization algorithms have the disadvantage of being prone to premature convergence and falling into local optima, resulting in poor robustness. Therefore, a chaotic particle swarm optimization algorithm is proposed. This algorithm first utilizes the ergodicity and randomness of chaotic maps to initialize particles, and then introduces dynamic inertia weight coefficients and learning factors to balance global and local search capabilities. The optimization algorithm and suspension characteristics are simulated using MATLAB, and compared with traditional particle swarm optimization. The results show that the improved chaotic particle swarm optimization had faster convergence speed and better convergence accuracy, and the suspension body acceleration, suspension dynamic deflection, and wheel tire dynamic load root mean square values are reduced by 5.8%, 0.8%, and 6.0%, respectively, verifying the feasibility and effectiveness of the proposed method. References | Related Articles | Metrics

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Design and Analysis of Dual Wishbone Independent Suspension for All Terrain Off-road Vehicles YANG Zhao 2023, 48(23): 63-67.  DOI: 10.16638/j.cnki.1671-7988.2023.023.012 Abstract ( )   PDF (1655KB) ( )   This article introduces the design, calculation and finite element analysis of a dual wishbone independent suspension system applied to all terrain off-road vehicles, which can effectively improve the suspension performance of modern off-road vehicles and solve the constraints of traditional forms of non independent suspension on off-road vehicle smoothness, handling stability, and passability. Firstly, the overall design requirements for the dual wishbone independent suspension system of the all terrain off-road vehicle are proposed, and then the main performance parameters are determined based on the reference model, basic model, and normal performance guarantee. Complete the conceptual design of the suspension system for the all terrain off-road vehicle through the design and calculation of elastic components, guide components, and damping components. By conducting finite element analysis of the suspension system of the all terrain off-road vehicle and simulating the four operating conditions of the suspension jump process, This article introduces the design, calculation and finite element analysis of a dual wishbone independent suspension system applied to all terrain off-road vehicles, which can effectively improve the suspension performance of modern off-road vehicles and solve the constraints of traditional forms of non independent suspension on off-road vehicle smoothness, handling stability, and passability. Firstly, the overall design requirements for the dual wishbone independent suspension system of the all terrain off-road vehicle are proposed, and then the main performance parameters are determined based on the reference model, basic model, and normal performance guarantee. Complete the conceptual design of the suspension system for the all terrain off-road vehicle through the design and calculation of elastic components, guide components, and damping components. By conducting finite element analysis of the suspension system of the all terrain off-road vehicle and simulating the four operating conditions of the suspension jump process, References | Related Articles | Metrics

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Lightweight Design of Automotive Engine Bracket Based on Topology Optimization SHAN Kezhen 2023, 48(23): 68-73.  DOI: 10.16638/j.cnki.1671-7988.2023.023.013 Abstract ( )   PDF (2535KB) ( )   To explore a new direction for lightweight design of automotive engine mounts based on topology optimization, 3D modeling is used to create a 3D model of the automotive engine mount. The material redundancy area of the part is obtained by analyzing the mechanical response of the part under actual usage conditions. Taking the material redundancy area as the design domain, a topology optimization analysis is conducted on the automotive engine bracket. The result shows that optimal mechanical transmission path for the part under actual usage conditions, thereby completing the reconstruction of the lightweight optimization model. By establishing an optimization model and conducting finite element analysis under actual operating conditions, the effectiveness of the optimization scheme is verified, and a lightweight design reference for automotive components is provided. References | Related Articles | Metrics

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A Reverse Gear System with Synchronization Function for Light Truck Transmission GAO Jianmin 2023, 48(23): 74-78.  DOI: 10.16638/j.cnki.1671-7988.2023.023.014 Abstract ( )   PDF (1718KB) ( )   The sliding sleeve structure is widely used in the middle reverse gear of medium and light truck manual transmission. When the structure changes gears, there is a speed difference, which will produce a big impact and cause the whole vehicle to move, thus affecting the whole vehicle using comfort. This paper provides a reverse gear system with synchronous function for medium and light truck transmission, which adds friction pairs without changing the size of external interface, and reduces the speed difference through its synchronous function, so as to achieve the improvement of shift feel. At the same time, this reverse gear system can replace the original system without the consideration of installation or mould. The system will in low development cost for its easy manufacturing technology and good interchangeability. References | Related Articles | Metrics

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Performance Simulation and Experimental Study of a Light Truck Disc Brake System GUO Zhenhua 2023, 48(23): 79-83.  DOI: 10.16638/j.cnki.1671-7988.2023.023.015 Abstract ( )   PDF (4360KB) ( )   Using computer aided engineering (CAE) simulation methods and experimental testing methods, CAE strength analysis, temperature field analysis, and noise testing analysis of a light truck disc brake system are carried out. The results show that under the braking condition of an initial speed of 80 km/h, the yield strength, thermal stress, and temperature rise curve of the key components of the disc brake system met the design objective requirements. At the same time, on-site testing shows that there are no reliability issues related to the strength and thermal stress of the disc brake system. The development process combining simulation analysis and actual vehicle testing has improved the reliability of the disc brake system, shortened the component development cycle, reduced costs and increased efficiency, and effectively enhanced the product competitiveness of this light truck model. References | Related Articles | Metrics

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The Influence of Different Air Guide Devices on Engine Compartment Thermal Management KE Xianzhi 2023, 48(23): 84-88.  DOI: 10.16638/j.cnki.1671-7988.2023.023.016 Abstract ( )   PDF (2152KB) ( )   In order to continuously optimize the vehicle thermal management performance of a commercial vehicle, improve the flow field of the vehicle, optimize radiation performance of the cooling system, the influence of different air guide devices on the flow field characteristics of the engine compartment are studied by using computational fluid dynamics (CFD) technology. The paper matches a 13 L gas engine on a heavy-duty commercial vehicle, through optimizing the positioning of the engine and wind shield structure, the influence of two types of wind shield on the engine compartment flow field are compared and analyzed, the pressure and velocity distribution inside the engine compartment, as well as the airflow and return flow through various positions of the cooling system are obtained, it can provide reference for optimizing the thermal management of the engine compartment. The results show that flow line in the engine compartment with the lower height wind shield is more uniform under rated conditions and high torque conditions, and the flow rate at each position of the cooling module increases to varying degrees, and the reflux decreases. References | Related Articles | Metrics

Testing and Experiment

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Research on Optimal Control of Automotive Semi-active Suspension Weight Coefficient XU Mingqing 2023, 48(23): 89-94.  DOI: 10.16638/j.cnki.1671-7988.2023.023.017 Abstract ( )   PDF (1523KB) ( )   The car ride comfort and operation stability are closely related to the suspension parameters. In order to improve the performance of semi-active suspension, the passive suspension model and semi-active suspension model of 1/4 vehicle with two degrees of freedom are established respectively in this paper, and the quadratic optimal control is applied to the semi-active suspension. MATLAB is used to build a simulation model. By adjusting the weight coefficient in the optimal control, the changes of the body vertical acceleration, suspension dynamic deflection and tire dynamic load of the semi-active suspension on the same random road surface are explored relative to the passive suspension. The appropriate weight coefficient is selected, and the performance of the semi-active suspension is better than that of the passive suspension in all aspects when the weight coefficient is within the range of its variation, and one of the weight coefficients can be adjusted so that the performance of one of the suspension is much higher than that of the passive suspension or even the active suspension. References | Related Articles | Metrics

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Analysis of NVH Test Methods for Fuel Cell Engines on Vehicles SUN Tian 2023, 48(23): 95-98.  DOI: 10.16638/j.cnki.1671-7988.2023.023.018 Abstract ( )   PDF (1881KB) ( )   As the power core of fuel cell vehicles, fuel cell engines require high-speed rotation of the air compressor and the operation of the hydrogen sub cycle system to ensure continuous power generation of the fuel cell stack during operation. This paper introduces two test methods for noise, vibration and harshness (NVH) performance of fuel cell engines during operation, based on simple noise testing and semianechoic chamber noise testing methods, which can provide reference for NVH test methods for fuel cell engines in the industry at present. References | Related Articles | Metrics

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Research on Vehicle's Rumble Problem Caused by Residual Dynamic Unbalance of Driveline REN Liangshun 2023, 48(23): 99-105.  DOI: 10.16638/j.cnki.1671-7988.2023.023.019 Abstract ( )   PDF (2159KB) ( )   For the rumbling problem complained by customers, noise and vibration detection are carried out by a front-rear drive vehicle as the research object. After analyzing the data, it is found that driveline order noise is the source. This paper makes a mechanical analysis between the source, transmission path and body response. According to the noise generation path, the potential solutions are listed and manufacture trial samples for verification. The results show that the control of key factors (vibration isolation rate, driveline mode) and noise suppression factor (eccentricity generated by assembly gap) are very effective to solve the problem of interior roar caused by residual dynamic imbalance of the driveline. References | Related Articles | Metrics

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Complex Eigenvalue Analysis and Dynamic Transient Analysis of Automotive Brake Squeal Instability HUANG Xiaoting 2023, 48(23): 106-112.  DOI: 10.16638/j.cnki.1671-7988.2023.023.020 Abstract ( )   PDF (1698KB) ( )   In order to investigate the application of complex eigenvalue analysis (CEA) and dynamic transient analysis (DTA) on brake squeal prediction, both CEA and DTA are applied to predict the squeal instability of a disc brake system. The investigation is focused on the comparison of computational efficiencies, analysis characteristics and analysis results. The investigation results show that both methods are available to predict the potential brake squeal at about 7.5 kHz of the investigated disc brake, but the number of unstable frequencies predicted by CEA is larger than that predicted by DTA. Nevertheless, the CEA is far more efficient than DTA on squeal instability analysis. Furthermore, all the system eigenvalues and the unstable modes can be obtained by performing CEA on one run, while the system vibration accelerations (velocities or displacements), contact forces and contact areas can be calculated by carrying out DTA. The investigation results also show that friction coefficient has great influence on system stability, and the squeal instability increases with the increase of friction coefficient. References | Related Articles | Metrics

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Package Requirement and Stiffness Analysis of Passenger Car Bumper XIONG Song 2023, 48(23): 113-116.  DOI: 10.16638/j.cnki.1671-7988.2023.023.021 Abstract ( )   PDF (1537KB) ( )   Bumpers are important exterior components of automobiles, and their design determines the success of the developed vehicle model in a certain way. This paper focuses on the package requirements of car bumpers during the development process, such as position package requirements, pedestrian protection requirements, vehicle performance requirements, bumper layout regulations, and matching requirements between the front bumper and fog lights. It can provide corresponding reference for the analysis of human-machine layout of car bumpers. At the same time, finite element analysis software HyperMesh and ABAQUS are used to analyze the stiffness of the front bumper. When a force of 98 N is applied to the bumper, its deformation is not allowed to exceed 10 mm. The analysis results indicate that the deformation of the front bumper under the corresponding load is 2.435 mm, which verifies that the previous bumper design meets the requirements and avoids mold repair costs caused by improper design of the front bumper in the future. References | Related Articles | Metrics

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Motor Shaft Voltage Causes and Countermeasures and Test Methods XIE Binquan, 2023, 48(23): 117-123.  DOI: 10.16638/j.cnki.1671-7988.2023.023.022 Abstract ( )   PDF (2161KB) ( )   As the speed and platform voltage of the driving motor of new energy vehicles are getting higher and higher, the shaft voltage related problems caused by this have attracted more and more attention. Severe shaft voltage will cause bearing electric corrosion. Bearing electric corrosion can cause high-speed noise, vibration, harshness (NVH) problems and reduce efficiency, and even lead to system failure and safety risks in severe cases. At the same time, severe shaft voltage can also worsen the electro magnetic compatibility (EMC) performance of the motor system. This paper starts with the definition, classification and harm of shaft voltage, and gives engineering countermeasures by analyzing the cause mechanism of shaft voltage, which is verified by experiments. References | Related Articles | Metrics

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Temperature Rise and Heat Dissipation Analysis of In-wheel Motor Angle Module System under the Action of Multi-physics Coupling CHAI Xiaohui 2023, 48(23): 124-134.  DOI: 10.16638/j.cnki.1671-7988.2023.023.023 Abstract ( )   PDF (2994KB) ( )   In order to better explore the multi-physics coupling characteristics of the in-wheel motor angle module system during operation and solve the difficult problem of heat dissipation of in-wheel motors in limited space, based on the bond graph theory, the multi-physics coupling model of the in-wheel motor angle module system is established, and export the mathematical model. Use MATLAB/Simulink for dynamic simulation, analyze the output torque and temperature characteristics of the in-wheel motor under the action of multi-physics coupling. The simulation results show that using water cooling mode has obvious cooling effect on stator winding. For different channel cross-sectional dimensions and coolant flow rates, the in-wheel motor presents different temperature rise characteristics. Under the same motor operating conditions and coolant flow, increase the water channel the inner diameter can achieve better cooling effect. Using the finite element analysis software Fluent for fluid simulation, the obtained motor temperature distribution cloud map and temperature change curve are basically consistent with the above conclusions, which verifies the practicability and reliability of the coupled model, and provides a theoretical reference for the design and application of the in-wheel motor angle module system. References | Related Articles | Metrics

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Improvement and Inspection Standards of Commercial Vehicle Rear Fender Support Failure MA Changjie 2023, 48(23): 135-139.  DOI: 10.16638/j.cnki.1671-7988.2023.023.024 Abstract ( )   PDF (6005KB) ( )   Aiming at the failure of commercial vehicle fender support products due to manufacturing defects in the development process, a computer aided engineering (CAE) simulation and bench comparison verification process based on measured road spectrum data is proposed. First, determine the failure mode; Secondly, determine the process defect of the failure part; The process is improved again, and the sample before and after the improvement is simulated by CAE and compared with the bench; Finally, the inspection standard of the product is formulated, and the follow-up use and tracking shows that the improvement effect is good. The research shows that this verification process can make an accurate and effective improvement plan for the failure of fender support products, and provide a process reference for the development of similar cantilever beam structure products in the future. References | Related Articles | Metrics

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Simulation and Experimental on the Performance of the Exhaust System of a Passenger Pickup Truck JI Jing 2023, 48(23): 140-144.  DOI: 10.16638/j.cnki.1671-7988.2023.023.025 Abstract ( )   PDF (2338KB) ( )   The exhaust system is an important structural system for passenger pickup truck models. Whether its structural design is reasonable is not only related to its own durability and reliability, but also directly affects the noise, vibration and harshness (NVH) performance, power economy performance, emissions and other performance of the entire vehicle. To ensure that the exhaust system performance of a passenger pickup truck development model meets the requirements of national policies and regulations, this paper uses computer aided engineering (CAE) simulation method and experimental testing methods, conduct exhaust system strength analysis, NVH modal analysis, temperature field analysis, noise testing, and road acceleration testing analysis of a passenger pickup truck model, and conduct detailed verification of the performance indicators of the exhaust system. The results show that at a frequency of 27 Hz, the maximum stress of the exhaust system suspension support is 214.9 MPa, which is less than the material yield strength. At the same time, the NVH mode avoids the engine idle resonance frequency, and the temperature field is evenly distributed and the highest temperature is lower than the temperature limit of the steel, meeting the design objectives and effectively enhancing the comprehensive market competitiveness of the passenger pickup truck model. References | Related Articles | Metrics

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Analysis of Two Typical Failure Modes of NIC in Whiplash Test ZHANG Aifa 2023, 48(23): 145-149.  DOI: 10.16638/j.cnki.1671-7988.2023.023.026 Abstract ( )   PDF (1482KB) ( )   The score of whiplash test can reflect the protection of car seat to human neck in rear-end accident, and neck injury criterion (NIC) is one of the evaluation indexes of whiplash test, its low score rate has plagued carmakers and seat suppliers. In order to solve this problem, a series of experiments are carried out according to the whiplash test procedure in China new car assessment program (C-NCAP), and two typical failure modes of NIC are summarized and extracted. Through literature research, theoretical derivation and simulation analysis, the direct factors affecting NIC are obtained, including acceleration lifting time difference, acceleration lifting speed difference and acceleration lifting stability, and classified summarized the optimization of the factors of the optimization measures. The research conclusion will serve for the development of seat and provide reference for the optimization of seat whiplash performance. References | Related Articles | Metrics

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Computing and Analysis on Frontal Eccentric Collision Velocity of Car Based on Collision Mechanics XIE Li 2023, 48(23): 150-154.  DOI: 10.16638/j.cnki.1671-7988.2023.023.027 Abstract ( )   PDF (1309KB) ( )   According to the principle of collision mechanics, the determination of the instantaneous speed of frontal eccentric collision for cars in opposite directions is studied in this paper. For different collision situations, through the exchange of collision form, momentum and energy in collision, using the basic principles of mechanics and practical experience summary of related events, the speed equation of the car collision moment is listed, and the ultimate goal is to give the driving speed of the vehicles of both sides under each specific collision condition. At the same time, after giving the calculation formula, the relevant parameters involved in the vehicle speed calculation formula are also analyzed and studied and their application scope is defined. The results provide a practical way to calculate the speed for identifying the speed in road traffic accidents, so as to help and inspire the relevant practitioners in solving the problem of collision speed. References | Related Articles | Metrics

Process·Materials

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Explosion Strength Analysis of Distribution Manifold of Hydrogen Fuel Reactor Based on Infrared Welding WANG Huan 2023, 48(23): 155-160.  DOI: 10.16638/j.cnki.1671-7988.2023.023.028 Abstract ( )   PDF (2743KB) ( )   The existing distribution manifold is generally fixed by bolted connection, which has the problems of low cleanliness, low connection strength, poor durability and high production cost. The research group proposed the method of infrared welding PPS-GF40 4020T material to develop fluid distribution manifold to improve the connection mode: The infrared welding performance of the distribution manifold made of polyphenylene sulfide (PPS) is studied, and the connection strength of the new distribution manifold is analyzed. Using infrared welding test, by the automatic computer controlled blasting test bench to determine the connection blasting strength, according to the actual production of products to test, optimize the welding process parameters, to find the best welding effect. The results show that the optimal welding strength can be obtained when infrared power is 20 kW, welding heating time is 40 s, heating distance is 3 mm, welding curing time is 20 s, welding depth is 1.5mm and clamping force is 920 N. The pressure inside the distribution manifold can withstand 8 bar. When the infrared energy absorbed by the distributed manifold is different, the degree of fusion bonding and welding defects (cauterization, bubble and carbonization) of welded bars are the main factors affecting the mechanical properties and failure forms of joints. References | Related Articles | Metrics

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Analysis of Failure Cause of Aluminum Shell for New Energy Vehicles Power Battery Arc Welding HU Liping 2023, 48(23): 161-166.  DOI: 10.16638/j.cnki.1671-7988.2023.023.029 Abstract ( )   PDF (2541KB) ( )   Due to the easy oxidation of aluminum profiles in the air and the melting point of the oxide layer is very high, the weldability defects of aluminum profiles lead to many difficult problems in the arc welding process of thick plate aluminum profiles, such as bubbles, splashes and arc failures. This paper introduces the arc welding problem encounter in the new energy vehicles field of aluminum battery shell arc welding process, comprehensive analysis of the factors that contribute to the failure of arc welding of aluminium profiles, such as grounding, wire feed system, welding parameters, etc., and the process of solving the problem are summarised.The optimization measures proposed in this paper have a good guiding significance to solve the problem of aluminum arc welding in aluminum arc welding process. References | Related Articles | Metrics

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Application and Research of Heavy-duty Truck Axle Automatic Production Distribution Logistics Based on AGV SONG Pingping 2023, 48(23): 167-171.  DOI: 10.16638/j.cnki.1671-7988.2023.023.030 Abstract ( )   PDF (2316KB) ( )   Aiming at the problems of automatic transformation such as the variety of auto parts, large size differences, complex warehousing and distribution logistics equipment. This paper through the case study of the production and distribution logistics of heavy duty axle, the laser guided automatic guided vehicle (AGV) and fork AGV are adopted, and the supporting packaging and multi-layer shelves are designed and developed. It has achieved obvious results in reducing warehousing and distribution personnel, improving the flexibility of enterprise employment, reducing the number of logistics forklifts, improving economic benefits, improving the automation level of warehousing and distribution, and breaking through the bottleneck of smart factory construction. It can be used as a reference for the intelligent and less humanized parts of the automobile industry. References | Related Articles | Metrics

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Carburizing and Quenching Deformation Control of a Gear on a Light Truck Platform ZHANG Haiqing 2023, 48(23): 172-175.  DOI: 10.16638/j.cnki.1671-7988.2023.023.031 Abstract ( )   PDF (1388KB) ( )   The paper mainly studies the heat treatment deformation rule of the quenching process of 20CrMnTi alloy gear of a light vehicle platform, and uses the new structure tooling to control the deformation control of the platform. By means of different the charging method of parts, studying the gear accuracy, profile, flatness, layer depth and hardness help to direct a more suitable charging method. The results show that matrix tooling can obviously improve the heat treatment deformation of gears. After using the matrix tooling, the gear accuracy of heat treatment changes from 4 to 2. The changes of flatness, layer depth and hardness have been reduced to some extent. References | Related Articles | Metrics

Automobile Education

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Reform and Practice of Case-based Teaching in Thermodynamics Fundamentals for Mechanical Majors under the Background of New Engineering GAO Huaibin 2023, 48(23): 176-179.  DOI: 10.16638/j.cnki.1671-7988.2023.023.032 Abstract ( )   PDF (1112KB) ( )   Case-based teaching is a teaching method based on practical cases, which is very suitable for engineering courses with strong applicability. In the Thermodynamics Fundamentals course, case-based teaching can help students better understand and apply the knowledge they have learned, improve their engineering practice experience and modern engineering literacy. The combination of teaching content and practical problems allows students to learn relevant knowledge by analyzing and solving practical problems. Case-based teaching emphasizes the guidance of teachers and the exploration of students, cultivating students' innovation and practical abilities. This teaching method can not only cultivate students' motivation and interest in learning, but also improve their practical ability and problem-solving ability. Case-based teaching is a very effective teaching method, which is worth being widely used in the Thermodynamics Fundamentals course. References | Related Articles | Metrics

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Research on the Transformation Path Strategy of Automobile Skills Competition Achievements SHE Yong 2023, 48(23): 180-183.  DOI: 10.16638/j.cnki.1671-7988.2023.023.033 Abstract ( )   PDF (1007KB) ( )   Skills competitions are not only an effective way to select highly skilled talents, but also promote the progress and development of vocational education. This article is based on the automobile inspection and maintenance competition of vocational college skill competitions, and proposes the important significance of the transformation of skill competition results for teaching resources from pre-competition preparation, practice during the competition, and summary after the competition. This article analyzes the transformation paths and strategies of competition resources into classroom teaching from the aspects of competition content to teaching content, competition training work orders and scoring standards to classroom teaching, competition training methods to teaching methods, idle competition equipment, and competition expansion resources. This can provide reference and ideas for subsequent classroom teaching and curriculum reform, and help comprehensively improve the quality of talent cultivation in vocational colleges. References | Related Articles | Metrics

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Research on Division of Labor and Collaborative Teaching Practice Based on SGAVE Project WANG Xiaoliang 2023, 48(23): 184-188.  DOI: 10.16638/j.cnki.1671-7988.2023.023.034 Abstract ( )   PDF (1191KB) ( )   In view of the shortcomings of vocational education in learning content structure and assessment mode, relying on the operation mechanism of Sino-German Advanced Vocational Education (SGAVE) cooperation project, the German dual education concept is introduced. According to the position of automobile mechanical and electrical maintenance, the skill elements and responsibility division of the job field are analyzed, the specific content of the learning field is refined, and the curriculum system is reconstructed. This paper constructs a teaching practice model of division of labor and cooperation from the aspects of teachers' division of labor and cooperation strategy, students' division of labor and cooperation learning process, and school-enterprise division of labor and cooperation mode, implements specific teaching steps, and forms a job responsibility rotation assessment model, which provides guidance and basis for the development of division and cooperation teaching practice. References | Related Articles | Metrics

Standards·Regulations·Management

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Research on Intelligent Charging Platform for Electric Vehicle Information Sharing under the Background of Dual Carbon Goals XU Xiangfeng 2023, 48(23): 189-194.  DOI: 10.16638/j.cnki.1671-7988.2023.023.035 Abstract ( )   PDF (1266KB) ( )   This article studies the business model and development of the electric vehicle charging industry, classifies electric vehicle related enterprises and their reverse trends, and points out the problems existing in each type of enterprise. Then, from the entire charging operation system framework, it analyzes the various entities in the charging process and their logical relationships. On the basis of this system, three business model stages of the charging platform are proposed, and in the third stage, a consumer to consumer (C2C) information sharing smart charging e-commerce platform is constructed to operate. The platform participants, operation process, carbon reduction and shortcomings are analyzed. Finally, the development prospects of information sharing smart charging platforms in the electric vehicle industry under the dual carbon background are prospected, providing ideas for the development of the electric vehicle industry and contributing to the national dual carbon goals. References | Related Articles | Metrics

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The Tableau Digitalization Display of Production Quality Information in Automotive Engine HE Dazhuang 2023, 48(23): 195-200.  DOI: 10.16638/j.cnki.1671-7988.2023.023.036 Abstract ( )   PDF (1871KB) ( )   There are many difficulties in the statistics and expression of engine production quality, such as multiple processes, scattered quality data, complex evaluation criteria, and incomprehensiveness and inaccuracy in the process of analysis and statistics, which bring inconvenience to the improvement work. A systematic expression method is established in Tableau software from the aspects, such as engine production quality information display and analysis, data dimensions and expression methods, display planning and view design, data import and page operation, and digitalization results display in this paper, so as to realize high-level and dynamic data presenting. This study reduces the repetitive work of engineering personnel, improves the accuracy of statistics, and achieves the ultimate goal of highlighting key problems, assisting leaders in decision-making, and reducing scrapping and controlling claims. References | Related Articles | Metrics

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Research on the Construction Method of Driving Cycle Based on the User Scenario LI Ping 2023, 48(23): 201-209.  DOI: 10.16638/j.cnki.1671-7988.2023.023.037 Abstract ( )   PDF (2772KB) ( )   This paper proposes a method for constructing vehicle driving conditions based on user scenarios. Considering the differences in the characteristics of road data collected in urban, suburban and high-speed conditions, it adopts the short-stroke method for urban and suburban conditions, and innovatively proposes segment segmentation and reorganization algorithms for high-speed conditions, which solves the problem of excessively long duration of actual collected data segments. And develop the working condition construction software of the whole process to realize automatic processing. After verification, the average error of the driving conditions constructed in this paper and the original data characteristic parameters is less than 5%, which meets the requirements of engineering use. It can be used to guide the energy management optimization and vehicle energy consumption evaluation in the process of vehicle development and calibration, and improve the road adaptability of vehicles. References | Related Articles | Metrics