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23 August 2024, Volume 49 Issue 16 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education


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New Energy Vehicle

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Study on Heat Dissipation Performance of Air Conditioning Condenser of Battery Electric Vehicles LU Zhao1 , ZHU Qijia1 , WANG Feng1 , ZHAO Ziqiang*1 , NI Qiangqiang1 , ZHANG Zhihui2 2024, 49(16): 1-9.  DOI: 10.16638/j.cnki.1671-7988.2024.016.001 Abstract ( )   PDF (1371KB) ( )   Restricted by the arrangement of forecabin cooling module and opening area of the grille, the cooling air on the windward of the condenser presents non-uniform velocity and temperature distribution, which may seriously affect its heat dissipation performance. This study takes the forecabin cooling module of battery electric vehicles as the research object, establishes the mathematical models of one and a half/two layers arrangement schemes based on AMESim software, and verifies the accuracy of the conducted model through the theoretical calculation, and reveals the revolution of heat dissipation of condenser with the cooling air parameters on the windward side under the arrangement modes. It is found that for the two layer arrangement scheme, the condenser owns the optimum heat dissipation performance under the condition of uniform air velocity, and that decreases significantly with the increase of air supply volume in the subcooling area; for the one and a half arrangement scheme, when the low-temperature radiator is arranged in the upper/middle/lower part of condenser, the reduction of heat dissipation rate of condenser is 10%, 15% and 17% respectively. The findings in this paper can provide the technical support and theoretical guidance for improving performance and layout optimization of the forecabin cooling module of battery electric vehicles. References | Related Articles | Metrics

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Analysis and Optimization of Battery Pack Mode in Snap Change System WANG Shuili, SUN Guanyi* , GUAN Chengjun, LI Jiming, WANG Yuxiao 2024, 49(16): 10-15.  DOI: 10.16638/j.cnki.1671-7988.2024.016.002 Abstract ( )   PDF (1221KB) ( )   In this paper, the influence of the snap-change lock body on the Z-mode of the battery pack is studied. Through the classification adjustment and structural optimization of the Z-tolerance stroke of the snap-change lock body, the adjustment of the structure and the form of the limit mechanism, and the analysis of different hardness and stress changes of the buffer block, the computer aided engineering (CAE) analysis and the vibration bench sweep frequency test are combined. Under certain conditions, on the basis of satisfying the quick-change system and unlocking function, the optimal size, structural form and flexible connection stress value of the three key factors of the quickchange lock body tolerance displacement size, limiting mechanism form and Z-direction buffer block reverse stress size are explored and analyzed, and the optimal balance parameters are studied and determined to improve Z vibration mode, service life and economy of quick change battery pack. References | Related Articles | Metrics

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Visual Analysis of the Layout Research of Electric Vehicle Charging Stations LI Feixing1 , LIU Jia1 , WANG Shuaishuai1 , HAN Wensi1 , ZHANG kai2 , LAI Junfeng*3 2024, 49(16): 16-21,50.  DOI: 10.16638/j.cnki.1671-7988.2024.016.003 Abstract ( )   PDF (5729KB) ( )   In the process of promoting green transportation, optimizing energy structure, and promoting the development of new energy vehicles in the automotive industry, research on the layout of charging stations as infrastructure for electric vehicles is essential. This article screened 1 213 relevant literature on the layout of electric vehicle charging stations from the China national knowledge infrastructure (CNKI) database and the web of science (WOS) core collection database, and analyzed them using Citespace visualization research and analysis software. The research results indicate that the current layout of charging stations both domestically and internationally is based on meeting charging needs and considering various influencing factors for research; the focus of charging station layout will shift from intercity to high-speed, from warm areas to cold areas; the simulation algorithm for charging station layout will gradually tend to simulate real-life situations. It has certain reference value for accelerating the construction of charging stations, clarifying the layout direction, and optimizing the layout methods. References | Related Articles | Metrics

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Sensitivity Study on Skin Effect of Flat Wire Motors Considering New Energy Vehicles LI Zhongyu, WEI Biao, LIU Hongxin 2024, 49(16): 22-26.  DOI: 10.16638/j.cnki.1671-7988.2024.016.004 Abstract ( )   PDF (1629KB) ( )   In order to study the sensitivity of skin effect on the number of flat wire layers and its impact on the high-speed efficiency of new energy vehicle flat wire drive motors, a motor with a peak power of 220 kW and a rated power of 90 kW is selected as the research object in this paper. By combining analytical calculation and finite element calculation methods, the resistance increase coefficients of each winding conductor based on four, eight layers of windings are comprehensively analyzed, as well as the influence of skin effect on the motor under high-speed operating conditions. Through the comparison of analytical method and finite element calculation, it is concluded that the calculation results of the two methods are similar, with the same trend. The results show that as the speed increases, the skin effect has a significant impact on the efficiency and heating of the motor. The current increases radially along the motor towards the slot position, causing the temperature rise of the winding conductor at the slot position to increase. Furthermore, it significantly increased the rotor temperature, providing a certain reference for the design and optimization of flat wire drive motors for new energy vehicles. References | Related Articles | Metrics

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Research on the Influencing Factors of Local Stress in Power Battery House CHEN Yan, WANG Yu, FANG Youwei 2024, 49(16): 27-31.  DOI: 10.16638/j.cnki.1671-7988.2024.016.005 Abstract ( )   PDF (2087KB) ( )   As the most critical load-bearing component of the power battery system, the structural stability of the power battery house is crucial to the operation of the vehicle. This paper combines theoretical analysis and finite element simulation analysis to study in detail the influence of three aspects, such as the thickness of the house material, the structure of the house, and the presence or absence of reinforcement plates, on the local stress law and mechanism of the house. The finite element simulation analysis is carried out by HyperMesh software, and four groups of local stress locations and local stress values are obtained. Comparison and analysis of the four groups of local stress simulation results, the direction of the project to effectively reduce the local stress of the house: reasonable structural design can not only make full use of the elastic deformation of the parts themselves to absorb some of the stress, but also can effectively transfer the stress out, as well as increase the thickness of the material at the part of the local stress concentration. The paper also through the optimized battery house for vibration test, the test results prove the optimization direction of reducing local stress, house structure optimization design of the effectiveness and reasonableness, for the follow-up vehicle battery house structure optimization design provides a certain reference basis. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on Operational Design Condition of Heavy Commercial Vehicle Platooning Drive JI Xing, ZHU Huanzhang, MAO Shengfa, BO Tao, LIU Chao 2024, 49(16): 32-39.  DOI: 10.16638/j.cnki.1671-7988.2024.016.006 Abstract ( )   PDF (1108KB) ( )   Platooning drive refers to two or more vehicles using communication technology and autono- mous driving technology to maintain a certain distance and travel at a stable speed. In recent years, with the rapid development of wireless communication technology and autonomous driving technology, the research into heavy commercial vehicle platooning has become a key research direction. It can help improve the safety and efficiency of transportation, and at the same time, can reduce energy consumption and exhaust emissions. Operational design condition (ODC) are necessary prerequisites for platooning system, which means the conditions under which the system can start and safely perform dynamic driving tasks. This article analyzes the current research status of construction methods for design operating conditions internationally, and combines the functional characteristics of platooning systems to propose design operating conditions suitable for heavy commercial vehicle platooning. It also analyzes the dynamic and static entities, environment, drivers and passengers, vehicle status, and following distance to ensure the stable operation of platooning functions within the operational design domain (ODD), which helps to improve system safety. References | Related Articles | Metrics

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Research on the Pedestrian Detection Algorithm for Improving YOLOv4-tiny WANG Jing, GAO Haoning 2024, 49(16): 40-43.  DOI: 10.16638/j.cnki.1671-7988.2024.016.007 Abstract ( )   PDF (1298KB) ( )   In the process of automobile intelligence, the research of road pedestrian detection is essential. This paper proposes an improved pedestrian detection algorithm based on YOLOv4-tiny, which is applied to the small vehicle camera. The spatial pyramid pooling structure (SPP) is introduced into the network structure, and the integration of local and global features is realized through SPP module to enrich the expression ability of the final feature map; the coordinate attention (CA) mechanism is introduced into the feature layer and upper sampling to pay attention to the image features from the channel and space; the experiment uses PASCALVOC-2007 data set for training and verification. The experimental results show that the average accuracy of the improved algorithm is improved by 3.84%, the F1 value is 0.80, the accuracy by 0.77%, recall by 73.95%, and mean average precision (mAP) by 8.79%, which improves the detection accuracy while ensuring the algorithm rate. This study provides suggestions for pedestrian detection in the process of automobile intelligence driving. References | Related Articles | Metrics

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OTA Technology Application Based on Heavy Commercial Vehicles LI Weijin, LUO Pengfei, WANG Chenbo, ZHANG Ben, CHANG Hailong, YUAN Guangjie 2024, 49(16): 44-50.  DOI: 10.16638/j.cnki.1671-7988.2024.016.008 Abstract ( )   PDF (952KB) ( )   With the rapid development of telematics and intelligent connected technology, and the increasing level of vehicle electronics, over-the-air (OTA) technology will gradually become an important means of functional upgrading and fault repair in the automotive industry. This paper aims to discuss the application of OTA technology based on heavy duty vehicles, focusing on the OTA system scheme and key technologies based on heavy duty vehicles, and according to the future development of heavy duty vehicles in the direction of electronic and electrical architecture upgrade, software defined vehicles, etc. It is concluded that OTA technology will play a greater role in heavy commercial vehicles, and has certain innovative value. References | Related Articles | Metrics

Design and Research

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Optimization Design of Electronic Fuel Injection System for Automobile Engine SUN Wenfu 2024, 49(16): 51-55.  DOI: 10.16638/j.cnki.1671-7988.2024.016.009 Abstract ( )   PDF (1209KB) ( )   The structural form and characteristics of the fuel injection system in automobile engines directly affect the performance of the engine, and the calculation and analysis of the fuel system is an important method to improve engine performance. On the basis of analyzing the structure and mathematical models of the electronic fuel injection system components of the engine, a simulation model is established, and the structural parameters of the fuel system are optimized and matched. The research results indicate that the diameter and lift of the plunger are Φ23×24, the number and aperture of spray holes are 7×Φ0.45, it has good fuel injection characteristics, and the flow area of the solenoid valve drain port and the timely duration of power on also have a significant impact on the fuel injection characteristics of the fuel system; the optimized structural parameters have important reference value for the design of engine fuel systems. References | Related Articles | Metrics

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Design and Experimental of Gear Spiral Angle Modification for Heavy Truck Transmission ZHENG Hongyu, HAN YU, SU Tianjun* , GAO Xiaoyang, YANG Zekai 2024, 49(16): 56-60.  DOI: 10.16638/j.cnki.1671-7988.2024.016.010 Abstract ( )   PDF (2740KB) ( )   Aiming at the common phenomenon of offset load in gear contact of heavy truck transmission, this paper puts forward a method of gear spiral angle modification, which can improve gear contact offset load by adjusting gear spiral angle modification slope and changing the spiral angle size. Taking the 12-speed transmission of heavy truck as the research object, the finite element simulation is used to numerically simulate the gear pair, and the contact spot test, noise test and fatigue test are carried out. The results show that the contact stress distribution of the improved tooth surface is uniform, the contact spot is in the middle, the noise does not change significantly and still meets the fatigue test requirements, indicating that the contact condition of the gearbox gear pair is effectively improved, and the feasibility of the proposed modification method is verified. The research provides theoretical basis and experimental reference for the correction of offset load gear of heavy truck transmission. References | Related Articles | Metrics

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Research on Sideface Run-out Control of Brake Corner Module GAO Bo 2024, 49(16): 61-64,69.  DOI: 10.16638/j.cnki.1671-7988.2024.016.011 Abstract ( )   PDF (1885KB) ( )   The sideface run-out (SRO) of the brake corner module is mainly composed of the SRO of the brake disc and the SRO of the wheel hub flange. Limited by the machining accuracy of the parts, the SRO of the brake disc and the SRO of the wheel hub flange meet the technical requirements of the parts, but the SRO of the brake corner module exceeds the tolerance. This paper analyzes the SRO of the brake corner module superimposed by the brake disc and the wheel hub flange, transforms the axial SRO into a radial vector synthesis, thereby establishing a function on the circumference direction of the SRO measuring point, and adjusts the amplitude of the superimposed waveform by changing the phase of the measuring point of the brake disc. Theoretically solves the problem that the SRO of the parts is qualified but the SRO of the assembly is unqualified. The implementation plan is to add a spare brake disc positioning screw hole on the wheel hub flange, and the brake disc can be rotated and adjusted when the SRO of brake corner module detection fails for the first time, so as to change the SOR value of brake corner module after the brake disc and the hub flange are superimposed. At the same time, the paper also makes relevant technical requirements for assembly production and SRO detection to improve the assembly consistency of the brake corner module, and confirms the effectiveness of the implementation plan by tracking the subsequent brake corner module test results. References | Related Articles | Metrics

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Development of the Collaborative Chassis Controller for Pure Electric Commercial Vehicles WANG Yin, ZHANG Xu, GUO Zhilong, LU Wei 2024, 49(16): 65-69.  DOI: 10.16638/j.cnki.1671-7988.2024.016.012 Abstract ( )   PDF (1029KB) ( )   This study aims to develop a collaborative controller for the chassis of pure electric commercial vehicles. By integrating vehicle dynamics modeling with deep learning and proportionintegral-differential (PID) control techniques, a steering and braking collaborative controller is designed. The effectiveness and stability of the controller are verified through simulation. Simulation results demonstrate that the maneuverability and safety of pure electric commercial vehicles have been significantly improved. This provides support for the electrification development of commercial vehicles. References | Related Articles | Metrics

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Recall Control Strategy of Auto Seat Lumbar Based on Pressure Sensor CHE Minshi, LIN Xiaosheng, PAN Xinyu, ZENG Qianqian 2024, 49(16): 70-74.  DOI: 10.16638/j.cnki.1671-7988.2024.016.013 Abstract ( )   PDF (1172KB) ( )   The seat waist support, namely lumbar, is mainly used in the early days to reduce the fatigue caused by sedentary, but with the development of the automobile industry for more than 100 years, the phenomenon of sitting for a long time has gradually appeared on the drivers. In order to relieve the fatigue in long-distance driving and improve their comfort and safety, the demand for adjustable seat backrest is on the rise. Based on the pressure sensors, the paper proposes and optimizes the control strategy of lumbar recall under the memory-recall mode of the auto seat, which makes the lumbar recall with high precision, without noise, in a short time and solves the engineering problem of lumbar reset due to the limitation of hardware structure. References | Related Articles | Metrics

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Research on the Design Method of Anti-corrosion Reliability and Durability Targets of Automotive Body HUANG Chuigang 2024, 49(16): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2024.016.014 Abstract ( )   PDF (1046KB) ( )   The design of anti-corrosion reliability and durability targets for automotive body aims to ensure that the body can effectively resist corrosion in various complex environments and operating conditions, and maintain product performance to meet customer needs within the predetermined service life. Setting too high anti-corrosion targets can increase the cost of body anti-corrosion, thereby affecting enterprise profits; while setting too low targets may lead to customer dissatisfaction and damage product reputation. Therefore, it is crucial to set anti-corrosion reliability and durability targets reasonably. This study introduces quality function deployment (QFD), reliability and durability research methods to deeply explore the key elements, research objects and methods of anti-corrosion target setting. Practice cases is proved that based on the improved corrosion target setting method, can develop "just right" anti-corrosion reliability and durability targets that not only meet customer needs but also avoid over design, so as to control costs while ensuring product quality. References | Related Articles | Metrics

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Optimization Design of Axle Based on Formula Student Car Competition GAO Yan, CHENG Qingwei* , YAO Yunpeng, ZHONG Xucheng, LIANG Taijie 2024, 49(16): 80-84.  DOI: 10.16638/j.cnki.1671-7988.2024.016.015 Abstract ( )   PDF (2139KB) ( )   The formula SAE (FSAE) is an automobile design and manufacturing competition in which teams of university students majoring in automotive or mechanical engineering participate. The participating students organize a team to independently design, manufacture and debug a formula car every year. This paper discusses the optimization design of the axle based on the background of formula student automobile competition, especially the design scheme of titanium alloy hollow axle and carbon fiber axle. The advantages and challenges of new materials in the application of axle are analyzed, and the corresponding optimization strategies are put forward according to the competition requirements. The application of hollow axle of titanium alloy reduces the weight of racing car and improves its performance. The application of carbon fiber axle further improves the lightweight level of the car, and also improves the fatigue resistance of the axle, making the car more stable and reliable in fierce competitions. The application of these technologies has promoted the continuous development of racing technology, and has made positive contributions to cultivating talents with innovative spirit and practical ability. References | Related Articles | Metrics

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Analysis of Characteristics of CASE-PUMA Four-segment Hydro-mechanical Continuously Variable Transmission KANG Jingjing, YAO Bowen, FEI Taojia 2024, 49(16): 85-90.  DOI: 10.16638/j.cnki.1671-7988.2024.016.016 Abstract ( )   PDF (2739KB) ( )   Hydro-mechanical continuously variable transmission has the advantages of high efficiency and stability, and the domestic research on this technology started late. CASE's PUMA four-segment hydro-mechanical continuously variable transmission is taken as the research object in this paper, and its continuously variable speed regulation, torque characteristics, and hydraulic power shunt ratio are analyzed. The relationship between the input-output speed ratio of PUMA transmission, the hydraulic power shunt ratio and the displacement ratio of variable pump and fixed motor, and the relationship between the torque of the output shaft of the transmission and the output shaft of the motor are given. In the end, based on AMESim software, the simulation model of PUMA transmission is established, and the relationship between its input speed and output speed is simulated and analyzed. The results show that the transmission can realize the continuously variable of the whole speed range of the tractor. The purpose of this study is to provide a reference for the theoretical research and design of stepless transmission. References | Related Articles | Metrics

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Failure Analysis and Optimization of Electric Drive Bridge Reducer Housing HE Shengping, HU Di, SHEN Hongjun, YUAN Zhongmou, YU Aijun, YAN Haikuan 2024, 49(16): 91-94.  DOI: 10.16638/j.cnki.1671-7988.2024.016.017 Abstract ( )   PDF (2809KB) ( )   A light commercial vehicle new energy electric drive bridge, in the full load 6.5T, 30 000 km road durability test process, running about 6 000 kilometers, abnormal power interruption occurred. After investigation, it is found that the shell of the electric drive bridge reducer is broken in the area of the differential bearing mounting hole, and even some of the main reducer gear of the faulty product have broken teeth. The fracture of the shell is analyzed by scanning electron microscope and confirmed as overload fracture. Combined with the static strength simulation of the shell, the results show that the fracture source region is consistent with the region where the simulated stress of the shell strength exceeds the yield strength of the material. By optimizing the shell structure, the stiffness of the area is increased and the strain is reduced. Combined with simulation analysis and test verification, the performance requirements are met. References | Related Articles | Metrics

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A Lightweight Scheme for Brake Disc LI Xiaodong, SONG Jie, SUN Ning, MA Guangmin, LI Wei, YAO Ge 2024, 49(16): 95-98,103.  DOI: 10.16638/j.cnki.1671-7988.2024.016.018 Abstract ( )   PDF (1965KB) ( )   The current lightweight technology for chassis components is a popular research direction in traditional fuel vehicles and new energy vehicles in the automotive industry. Lightweight brake discs have a positive effect on energy conservation and emission reduction, improving range, and reducing unsprung mass. In order to achieve the lightweight goal of chassis brake module for a certain vehicle model in China, this article proposes a lightweight design of traditional gray cast iron brake discs in the automotive brake system. The design scheme involves changing the brake disc cap from cast iron material to a lighter density aluminum alloy material, combining structural design and simulation analysis. This not only reduces the weight of a single brake disc by about 12%, but also significantly improves the thermal deformation performance of the brake disc. This provides improvement support for the lightweight requirements of the vehicle, and provides direction and suggestions for the design of a new type of brake disc structure. References | Related Articles | Metrics

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Design of a Fully Automatic Intelligent Car Wash Machine Control System Based on PLC Program MAN Jianhui1 , MA Ningning1 , NIU Zhongping1 , YANG Ercheng1 , LIU Jie*2 2024, 49(16): 99-103.  DOI: 10.16638/j.cnki.1671-7988.2024.016.019 Abstract ( )   PDF (1184KB) ( )   A fully automatic intelligent car washing machine control system based on programmable logic controller (PLC) program is designed to address the problems of water resource waste and high labor costs in the traditional car washing industry. It can meet the needs of automatic car washing under unmanned conditions. The selection and design of control schemes for fully automatic intelligent car washing machines, with a focus on selecting the models of circuit breakers, AC contactors, thermal relays, switch power supplies, and PLCs, as well as designing software, have certain research value in utilizing sensor systems to achieve fully automatic intelligent car washing functions. References | Related Articles | Metrics

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The Advantages and Challenges of Electro-Mechanical Braking in Commercial Vehicle Platform Application TIAN Xueyi, ZHANG Xiaozhe, LI Jianjun, LI Zhehan, LI Meng 2024, 49(16): 104-107.  DOI: 10.16638/j.cnki.1671-7988.2024.016.020 Abstract ( )   PDF (1091KB) ( )   The electro-mechanical brake (EMB) system use a highly integrated architecture, can reduce the number of components, enhance space utilization, optimize braking performance, and is easily integrable with other vehicle electronic control functions. It has become a hot topic in brakeby-wire research. This paper first introduces the composition and characteristics of the pneumatic brake system and EMB system for commercial vehicle platforms. It then analyzes the differences between the two systems, concluding that the EMB system offers advantages in environmental friendliness, efficiency, safety, lightweight design, and intelligence during its application in commercial vehicles. At the same time, the paper outlines challenges faced by the EMB system in its promotion, such as system instability, high cost, difficulty in standardization, and limitations in vehicle compatibility. The final solution is proposed to provide guidance for the further development of the system in the commercial vehicle field. References | Related Articles | Metrics

Testing and Experiment

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Research on Vehicle Thermal Balance Based on AMESim ZHANG Bo, FU Hao* 2024, 49(16): 108-111,137.  DOI: 10.16638/j.cnki.1671-7988.2024.016.021 Abstract ( )   PDF (1296KB) ( )   Under the high-speed condition of international heat balance, the water temperature of a gasoline engine with a pickup truck exceeds 115 ℃, resulting in the engine torque limit and the test can not pass. To solve the problem of high equilibrium water temperature in this working condition, the AMESim exhaust pressure field heat transfer model is established fristly, and the results of domestic heat balance tests are used to calibrate the simulation model, and then the simulation is carried out according to the boundary matrix of schemes such as increasing the pump speed ratio, increasing the fan and replacing the new radiator, so as to compare the influence of different boundary states on the engine equilibrium water temperature. The results show that the combination of large fan and new radiator can meet the international heat balance high speed condition without adjusting the pump speed ratio, and the equilibrium water temperature of the final test is basically the same as the simulation results. This method can quickly lock the hardware state that meets the test requirements and reduce the work of test selection. References | Related Articles | Metrics

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Study on the Influence of Bending Angle and Fluid on the Vibration Characteristics of Automobile Fluid Pipeline CAI Xiaobo, QIAO Hui* , WANG Jie, TANG Du, JING Liangbiao 2024, 49(16): 112-116.  DOI: 10.16638/j.cnki.1671-7988.2024.016.022 Abstract ( )   PDF (1503KB) ( )   In order to study the influence of bending angle and fluid on the vibration characteristics of automobile flow pipelines, this paper uses ANSYS Workbench analysis software to simulate the modal frequencies and vibration modes of empty and liquid filled pipelines under different bending angles ( 90°, 105°, 120°, 135°, and 150°), and further process and analyze the modal frequencies of fluid pipelines under different working conditions. The results indicate that an increase in bending angle and the presence of fluid significantly reduce the modal frequency of the fluid pipeline, while in lower order modes, the influence of bending angle and fluid on the modal vibration mode of the flow pipeline is relatively weak. This study provides a basis for the design and selection of automobile fluid pipelines in the filled and empty state in the later stage. References | Related Articles | Metrics

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Structural Strength and Modal Analysis of a Certain Bus WAN Haiqiao 2024, 49(16): 117-120,162.  DOI: 10.16638/j.cnki.1671-7988.2024.016.023 Abstract ( )   PDF (1869KB) ( )   The structure of a bus is a very important part of the bus design and manufacturing process. As the basic structural components of the bus, the frame and body are responsible for carrying the layout of all systems and are the main carriers for bearing various impacts caused by the unevenness of the free ground. Due to its complex structure and large development cost, high requirements are put forward in the design stage. Therefore, the strength and modal analysis of the frame and body are important steps to ensure the reasonable design of the bus structure. This article describes a finite element analysis method, describes in detail the precautions in the finite element analysis process and the simulation of related important components, which has certain guiding significance for the analysis of the strength and modal of the entire vehicle structure. References | Related Articles | Metrics

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Research on the Influence of High Adjustment Strategy on Wheel Load of Hydro Pneumatic Suspension Vehicles HUI Dongfang, CHEN Lei, WANG Chengyun, DUAN Juntao, DENG Rui 2024, 49(16): 121-125.  DOI: 10.16638/j.cnki.1671-7988.2024.016.024 Abstract ( )   PDF (1425KB) ( )   To solve the problem of significant differences in coaxial left and right wheel loads and poor data repeatability in measuring wheel loads after multiple automatic center adjustments for a certain hydro-pneumatic suspension vehicle model, through experimental measurements of wheel load and suspension cylinder pressure, it is found that there is a positive correlation between wheel load and cylinder pressure. Using a simplified mathematical model, it is analyzed that the reason for this phenomenon is that using only the length of the hydro-pneumatic spring to adjust the vehicle height strategy will lead to uncertainty in the gas pressure and oil volume inside the hydro-pneumatic spring, thereby causing differences and uncertainties in wheel load. Therefore, this article proposes that the height adjustment control strategy for hydro-pneumatic suspension vehicles needs to introduce pressure (or oil volume in the hydro-pneumatic spring cylinder) control to avoid the negative impact of significant differences in left and right wheel loads on safety and stability. References | Related Articles | Metrics

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Simulation Analysis of Low-Frequency Squeal Suppression for Fixed Calipers of a Certain Vehicle Model ZHANG Qiuyang, XIANG Hui, XIE Taoxin, GUO Xin 2024, 49(16): 126-132.  DOI: 10.16638/j.cnki.1671-7988.2024.016.025 Abstract ( )   PDF (2165KB) ( )   Taking the 3 000 Hz low-frequency squeal problem that appears in a fixed calipers during the development process of a certain vehicle model as the research object, refer to the Link3900 stand test results, establish the simulation finite element model of the fixed calipers, combined with the test modal mode adjust the material parameters of each component material of the finite element model, and use the complicated special value simulation analysis method to obtain the frequency and vibration of the system unstable mode. In response to the analysis of the sub-structure contribution and the sensitivity of braking disc in this unstable model, it is found that reducing the stiffness of the brake plate can reduce the unstable noise of the system, and verify that this method is effective. The results show that the analysis method of the compound special value is the feasibility and effectiveness for inhibiting and improving the low-frequency squeal of fixed calipers. References | Related Articles | Metrics

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The Study of Real Driving Emission Testing Method for Speed-limited Vehicle XU Xiaoliu, QIU Jinshan, LIU Xiaoliang 2024, 49(16): 133-137.  DOI: 10.16638/j.cnki.1671-7988.2024.016.026 Abstract ( )   PDF (1499KB) ( )   Real driving emission (RDE) test is an important test method for light vehicle emission test research. Starting from Limits and Measurement Methods for Emission from Light- duty Vehicles (China 6) (GB 18352.6－2016), RDE is also regarded as one of the important items for type certification of light-duty vehicles. According to the different characteristics of the maximum speed of speed-limited vehicle, there are many special test methods for real driving emission of speed-limited vehicle. Based on Limits and Measurement Methods for Emission from Light-duty Vehicles (China 6) (GB 18352.6 － 2016) the preliminary provisions of the test method forspeed-limited vehicle, this paper studies and improves the emission standards for speed-limited vehicle on real driving emission test methods for the next stage, and verifies its rationality. Finally, a set of perfect pollutant emission test method for real driving emission of speed-limited vehicle is obtained, and it also provides suggestions for the formulation of emission standards in the next stage. References | Related Articles | Metrics

Process·Materials

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Exploration on Island Assembly Process of New Energy Power Battery ZHOU Xiaomin 2024, 49(16): 138-143.  DOI: 10.16638/j.cnki.1671-7988.2024.016.027 Abstract ( )   PDF (1383KB) ( )   Island assembly is a new assembly process for power battery modules, and compared with traditional assembly line, it can improve production efficiency and flexible production capacity, reduce labor input, reduce material flow. This paper explores the application of island assembly technology in practical production of new energy power battery by analyzing the assembly process and process characteristics of island assembly technology. First of all, the basic concepts and characteristics of the island assembly process, including the layout design, production process control, assembly process process of the island assembly production line; then combined with the actual production situation, for the special requirements of the power battery assembly process, an optimization plan for island assembly process is proposed, including intelligent robot collaboration and intelligent monitoring systems to improve production efficiency and quality stability; finally, the development trend of the power battery island assembly process industry is outward. References | Related Articles | Metrics

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The Research on Application of Automatic Tightening Technology in Four-Door Hinge Assembly of Car Body LIU Xiaoming, LU Huafeng, DAI Xiaobo 2024, 49(16): 144-148.  DOI: 10.16638/j.cnki.1671-7988.2024.016.028 Abstract ( )   PDF (1578KB) ( )   In order to achieve the goal of automatic installation of four-door hinges in the body, the effect of reducing staff is achieved and the manufacturing cost is reduced. Through the in-depth study of the body four-door hinge assembly process and automatic tightening technology, this paper proposes the application scheme of automatic tightening technology in the body four-door hinge assembly, and verifies the application performance in the first plant of Dongfeng Honda Automobile Company Limited, and obtains that the scheme is feasible, which provides more reference direction and optimization space for the application and expansion of similar scenarios in the automotive industry. References | Related Articles | Metrics

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Type Selection Design and Process Quality Control of Stud for BIW LIU Shaoyin, ZOU Shangbo, GUO Dongdong 2024, 49(16): 149-152,171.  DOI: 10.16638/j.cnki.1671-7988.2024.016.029 Abstract ( )   PDF (1533KB) ( )   In view of the frequent falling off of a M5 steel stud on the body in assembly shop, this paper analyzes the fracture phenomenon of the body and the falling off stud. Also the welding process and assembly process of the M5 stud near the issue stud and the shape of the assembly hole of the interior trim are compared. And carries out a large number of tests with different tightening torques and different tightening methods in body shop. The result analysis shows that the root cause of frequent falling off of M5 welding stud is that the selection of stud and the matching of interior trim mounting holes are unreasonable. Due to the excessive depth of the internal groove of the mounting hole and the thin plate, the plate is overstretched and deformed during the tightening process, and finally the plate is tear and the studs fall off. Two solutions are proposed, such as changing the type of stud and changing the depth of recessed groove of interior trim mounting hole. The two solutions can almost completely avoid the occurrence of bolt detachment in the assembly shop and greatly improving the quality of the body in white. It provides new ideas for stud type selection and welding process quality control of white body stud welding. References | Related Articles | Metrics

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Construction of Curriculum Ideological and Political Development Mode under the Blended Teaching Mode －Take Mechanical Engineering Materials for Example CAO Yu, LI Xiaoxue, XIE Li, LIAN Weixin, CAO Jingyu 2024, 49(16): 153-157.  DOI: 10.16638/j.cnki.1671-7988.2024.016.030 Abstract ( )   PDF (1172KB) ( )   As a new educational concept, curriculum ideological and political is a new requirement, new measure and new direction to strengthen personnel training and ideological and political education in colleges and universities in the new era, and how to effectively carry out curriculum ideological and political is an important issue that needs to be resolved in the current colleges. Taking Mechanical Engineering Materials as an example in this paper, by analyzing the connotation and development situation of curriculum ideological and political, clarifying the important significance of curriculum ideology and political education for college talents and curriculum ideological and political, the methods and effects of carrying out curriculum ideological and political in currently colleges are compared and analyzed, and based on a blended learning model in carrying out curriculum ideological and political is proposed. By exploring the excavation path of online-offline ideological and political elements, combined with the characteristics of Mechanical Engineering Materials, the teaching design is carried out on online-offline curriculum ideological and political, and conducting teaching practice, thereby improving teaching quality, strengthening curriculum ideological and political effects. References | Related Articles | Metrics

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Research and Practice of Training Applied Talents for Vehicle Engineering Specialty WANG Jinyuan1 , CUI Likun1 , ZHAO Chunjie2 2024, 49(16): 158-162.  DOI: 10.16638/j.cnki.1671-7988.2024.016.031 Abstract ( )   PDF (1067KB) ( )   The development level of the automobile industry represents the national economic strength and scientific and technological innovation level. With the progress of society and the rapid development of science and technology, the demand for jobs in society has changed dramatically. As the advantage integration and leading applications in the field of advanced manufacturing technology, the training of applied talents in vehicle engineering must involve multi-disciplinary knowledge and professional technology. Under the background of new engineering, how to carry out the construction of undergraduate majors for cultivation of applied talents with goal orientation that meet the needs of society, this is an urgent need for in-depth research at present. Based on Shaanxi University of Technology, this paper is aiming at several key problems in the training of applied talents for vehicle engineering major, and aiming at cultivating applied talents with innovative consciousness and taking the needs of social development as the guidance, to build an talent training system that can integrate into the regional economy and so as to adapt to the development of competitive industries. This will help cultivate basic professional quality, professional ability and innovation capability to lead the future of college student, and realize the ultimate goal of the great rejuvenation of the Chinese nation. References | Related Articles | Metrics

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Research on the Construction and Application of Online Open Courses Based on OBE Concept －Taking Automotive Design as an Example LIU Chao, CHEN Xiaoyuan 2024, 49(16): 163-166.  DOI: 10.16638/j.cnki.1671-7988.2024.016.032 Abstract ( )   PDF (1210KB) ( )   With the continuous deepening of information technology education, the construction of online open courses has been rapidly promoted. Based on the outcome based education (OBE) concept, the construction of online open courses is guided by learning outcomes, and pays more attention to the goals and learning outcomes of course teaching, which is a great promoting effect on students' self-learning ability and comprehensive professional literacy. Taking the construction of the online open course Automotive Design as an example in this paper, based on the OBE concept, research is carried out on the determination and refinement of the course objectives, course construction, teaching evaluation, and course optimization, and applied to specific teaching practices, providing a certain reference for the development of information education in the construction of online open courses. References | Related Articles | Metrics

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New Requirements for Teacher Role Transformation in Modular Teaching YANG Hao 2024, 49(16): 167-171.  DOI: 10.16638/j.cnki.1671-7988.2024.016.033 Abstract ( )   PDF (938KB) ( )   "Vocational Education 20" emphasizes the importance of modular teaching. Modular teaching requires teachers to connect with enterprise industry standards and reconstruct teaching modules. According to the cognitive laws of students and the requirements of the enterprise, the students' technical skills are modularized systematic training. This requires teachers to integrate into enterprises and familiarize with the development of the industry. They can conduct correct analysis of the requirements of the technical skills of the enterprise, and correspond to the requirements of the enterprise to the teaching link. Therefore, in order to connect the development of the industry and implement modular teaching. This article analyzes the integration of modular teaching in automotive-related courses, and teachers need to actively participate and realize role transformation. Re-revise the talent training plan, formulate curriculum standards, and integrate into a modular teaching link. It is proposed that teachers should actively change their role in accordance with modular teaching. By analyzing the case of modular teaching in intelligent sensors, it has a great positive effect on improving students' skills in different courses. References | Related Articles | Metrics

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Failure Detection and Initialization of Electronic Throttle Components on the 2019 Magotan B8L Sedan ZHANG Jiahui, WANG Feng, LU Yayun, XUE Xihong, BA Yinliang 2024, 49(16): 172-176.  DOI: 10.16638/j.cnki.1671-7988.2024.016.034 Abstract ( )   PDF (3186KB) ( )   In the actual operation process of automobile detection, it is found that sometimes only through one detection method can not accurately determine the cause and location of the failure, the failure cannot be eliminated, and it brings some trouble to the maintenance. In order to better detect automotive sensor faults, this paper introduces the actual detection method of engine electronic throttle assembly in detail, detects and analyzes the fault of throttle position sensor of 2019 Magotan B8L sedan, eliminates the failure and does throttle initialization, which provides automotive maintenance ideas for the maintenance industry and the teaching of higher vocational colleges. References | Related Articles | Metrics