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15 March 2023, Volume 48 Issue 5 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Optimization Analysis of Suspension Hard Points Based on Abnormal Tire Wear of Electric Vehicles CAI Yun1,2 2023, 48(5): 1-7.  DOI: 10.16638/j.cnki.1671-7988.2023.05.001 Abstract ( )   PDF (1033KB) ( )   The suspension hard point analysis and optimization design were carried out for the abnormal tire wear caused by the increasing body mass of electric vehicles. Adams/Car was used to establish the rigid-flexible coupling virtual prototype model of the double-arm front suspension, and it was verified that the increase of body mass would affect the matching relationship between the external inclination angle and the front bundle angle, and also increase the tire sideslip. In the optimal design is put forward to choose more hard points but only optimize the Z coordinate, quadratic optimization and optimization for the first time the results indicated that scheme is feasible, can sharply reduce the optimization computation and reduce development cycle, at the same time, the optimized electric model of double arm suspension fork wheel camber and toe angle got the matching relation between optimization, tire sideslip quantity greatly reduced, effectively reduce the abnormal tire wear. References | Related Articles | Metrics

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Design and Performance Simulation of Hydrogen Fuel Cell Vehicle Power System WANG Chengxiang 2023, 48(5): 8-15.  DOI: 10.16638/j.cnki.1671-7988.2023.05.002 Abstract ( )   PDF (1266KB) ( )   Aiming at the fuel economy and power performance of fuel vehicle and hydrogen fuel cell vehicle, a set of power system suitable for hydrogen fuel cell vehicle is designed based on the structural parameters and power performance indexes of a certain type of gasoline vehicle, and the power system control strategy is given to complete the overall layout and overall structure design. The design parameters of the power system of hydrogen fuel cell vehicle are determined based on the selection calculation of related components. A hydrogen fuel cell model, a driving motor model, a power battery model and a vehicle model were built on the MATLAB/Advisor platform. The performance of the designed hydrogen fuel cell vehicle's power system was simulated by using Chinese urban conditions, and compared with the original gasoline vehicle. The results show that, the dynamic performance of the designed hydrogen fuel cell vehicle is fully in line with the requirements of actual working conditions. Fuel economy, acceleration performance and climbing performance have been greatly improved, fuel economy increased by 17.5%, acceleration time increased by 11.7%, maximum climbing slope increased by 1.3% References | Related Articles | Metrics

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Research on Numerical Simulation Analysis of External Flow for Body Based on CFD NIU Beibei 2023, 48(5): 16-20.  DOI: 10.16638/j.cnki.1671-7988.2023.05.003 Abstract ( )   PDF (1206KB) ( )   The application of computational fluid dynamics (CFD) technology in the numerical simulation of external flow for car overcomes the limitations of wind tunnel test, but there are some problems such as non-standard simulation method, low accuracy, and unclear evaluation index and dimension. Focusing on the whole process of the simulation, in this paper, the external flow simulation analysis was carried out on the concept a surface (CAS) of a car. Firstly, the CAS was geometrically cleaned by pre-treatment technology to build the simulation model of CAS. Then, the CFD numerical simulation technology of the external flow was carried out based on the finite element software STAR-CCM+. Finally, the 3D velocity field, pressure field and flow diagram of CAS were obtained, so as to realize the calculation and analysis of the flow field distribution around the body, the main separation area and the air resistance coefficient. The simulation analysis and evaluation methods provided references for the early stage of vehicle development. References | Related Articles | Metrics

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Matching Design of Fuel Cell Passenger Vehicles Power System for Low Fuel Consumption HUI Bojing 2023, 48(5): 21-29.  DOI: 10.16638/j.cnki.1671-7988.2023.05.004 Abstract ( )   PDF (2255KB) ( )   On the basis of the green energy-saving and zero-pollution fuel cell vehicles, in order to improve the coordination stability of "electric-electric" hybrid vehicles and the efficiency of power systems, and meet the requirements of dynamic performance, the power system matching design of fuel cell/battery "electric-electric" hybrid vehicles is carried out. This paper takes fuel cell vehicles as the research object, and the selection and parameter matching of the drive motor, fuel cell system and power battery system are carried out according to the economic indicators of vehicle power performance. The degree of mixing definition is quoted and the power coordination between the fuel cell and battery hybrid systems is considered. Advisor vehicle simulation software is used to simulate various matching schemes under common working conditions. The results show that the determined power system matching design scheme has certain feasibility in terms of power performance and fuel economy, and complies with vehicle design specifications, that is, the best match between fuel cell (34 kW) and lithium-ion battery (46 kW). The reasonable power matching between the two power sources can effectively improve the power performance of the whole vehicle, ensure the economy, and thus reduce the average running cost of the vehicle. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Lightweight Object Recognition Rracking Model Based on YOLOv5 LI Haipeng 2023, 48(5): 30-33.  DOI: 10.16638/j.cnki.1671-7988.2023.05.005 Abstract ( )   PDF (1118KB) ( )   The road target detection is one of the key technologies in the field of autonomous driving. With the development of artificial intelligence, the application of road target detection is gradually widespread. This paper proposes a new target detection method based on the YOLOv5 network. The improvements include the integration of modules in ShuffleNet V2 and the use of GhostConv to transform the traditional Conv module. First, real-time video streams are collected in different road environments, and pictures and video streams are annotated. The modules in ShuffleNet V2 are integrated into the backbone network and the GhostConv module is used to improve the Conv module, which reduces the weight of the model and has less impact on the target detection accuracy. The marked images are input to the improved YOLOv5 network for training, and the obtained model is combined with the Deep SORT algorithm for target detection and tracking. The experimental results show that the weight of the obtained results decreases a lot, while the target detection accuracy increases. The improved network is lighter and easier to deploy on edge embedded devices. References | Related Articles | Metrics

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Fast Lane Detection Method Based on Deep Learning LIU Bin 2023, 48(5): 34-39.  DOI: 10.16638/j.cnki.1671-7988.2023.05.006 Abstract ( )   PDF (2347KB) ( )   Aiming at the problem of poor real-time nature of the current lane detection method based on deep learning, an efficient lane detection method LaneBezierNet is proposed in this paper. After acquiring the image from the front camera, firstly the method uses data enhancement technology to process the image, then directly outputs the Bezier curve control point coordinates of each lane in the image through the Bezier curve regression model, and the information of each coordinate point on the lane can be obtained by combining the Bezier curve equation. Experimental results show that while the higher accuracy rate of 92.89% on the Tusimple public dataset is achieved, the frames per second (FPS) reaches 116 bits/s. Compared with the lane detection method based on image segmentation, this method has a significant improvement in detection speed. The algorithm greatly improves the detection efficiency without significantly reducing the detection accuracy, which is more in line with the actual project requirements. References | Related Articles | Metrics

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Construction Method of Highways Road Test Scenarios for L3 Autonomous Driving ZHANG Meifang 2023, 48(5): 40-44.  DOI: 10.16638/j.cnki.1671-7988.2023.05.007 Abstract ( )   PDF (696KB) ( )   The development of autonomous driving technology cannot be separated from road testing. A scientific and thorough autonomous driving test evaluation system needs a complete test scenario as support. Highway scene, as a typical scenario of L3 level autonomous driving, test standards, test methods, and test scenarios need to be clearly defined. This paper through the source of L3 level autonomous driving highway test scenarios, scene classification and elements, and key technologies for scene construction, combines with L3 level autonomous driving highway application scenarios, from the aspects of autonomous vehicle emergency response and manual intervention capabilities and comprehensive driving capabilities, proposes the L3 level autonomous driving highway test scenarios and test items, which provides a basis for subsequent road test evaluation methods. References | Related Articles | Metrics

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Automatic Parking Simulation Test System Based on Actuator-in-loop PAN Ning 2023, 48(5): 45-49.  DOI: 10.16638/j.cnki.1671-7988.2023.05.008 Abstract ( )   PDF (2077KB) ( )   Simulation test platform has become an important technique in the development and verification of intelligent vehicle, for it can overcome the long cycle and high cost of the vehicle test. The dynamic characteristic of the actuator has a great influence on the automatic parking system because it has the working characteristics of low vehicle speed, frequent steering wheel operation and large steering angle. An automatic parking simulation test system is designed and built including the hardware of steering, throttle and braking system for a better approximation of these actuators in vehicle. The simulation results show that the system reflects the accuracy and delay characteristics of the actuator, and can be simulated for automatic parking, which is used for algorithm development and test verification, and provides reference for the design of simulation test system with similar functions. References | Related Articles | Metrics

Design and Research

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Analysis of the Secondary Collision Injury Mechanism of Pedestrian Head and Ground Based on the Reappearance of Accident CHEN Yifan 2023, 48(5): 50-55.  DOI: 10.16638/j.cnki.1671-7988.2023.05.009 Abstract ( )   PDF (1189KB) ( )   Considering that the multi-body dynamics model can accurately reproduce the accident process and obtain the collision parameters of the pedestrian's head at the moment when the head hits the ground, the finite element analysis method can accurately analyze the injury of the pedestrian's head. Therefore, this paper combines the multi-body dynamics model with the finite element analysis method to study the injury mechanism of pedestrian's head hitting the ground in vehicle-pedestrian collision accidents by the method of accident reproduction, so as to provide a theoretical basis for pedestrian protection and vehicle shape improvement. Firstly, PC-Crash is used to reproduce the vehicle-pedestrian collision cases. The simulation results show that the multi-rigid body model can accurately simulate the accident scene, so as to obtain the landing speed and angle of the pedestrian's head. Secondly, the finite element model of human head with fine facial structure is established.Finally, the collision parameters obtained by accident reconstruction are used as boundary conditions to analyze the collision between the pedestrian's head and the ground, and the biomechanical parameters such as intracranial pressure and von Mises stress are determined. The results show that after the pedestrian's head hits the ground, the stress wave will propagate inside and outside the skull, and produce different degrees of stress concentration in the skull and brain tissue. When the stress exceeds a certain limit, it will cause different degrees of brain damage. References | Related Articles | Metrics

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Research on Heavy-duty Vehicle Mass Estimation Based on Recursive Least Square and Bayesian Optimization Algorithm BAI Xiaoxin 2023, 48(5): 56-63.  DOI: 10.16638/j.cnki.1671-7988.2023.05.010 Abstract ( )   PDF (1648KB) ( )   In order to solve the problems of low accuracy and high cost of mass estimation in the actual use of heavy vehicles, a method of load estimation of heavy-duty vehicles with internal combustion engine based on recursive least squares (RLS) and bayesian optimization (BO) algorithm is proposed. In this method, a method for calculating vehicle acceleration and road slope based on data filtering is proposed. Controller area network (CAN) bus and global positioning system (GPS) elevation data are used to estimate heavy vehicle load based on vehicle longitudinal dynamics and RLS. The BO algorithm is used to model the 12 groups of training data, and the multivariable filtering parameters in the vehicle mass estimation model are optimized, and the test data are used to evaluate the model estimation performance. The results show that the method has good accuracy of load estimation, and the estimation error is less than 6%. References | Related Articles | Metrics

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Design of Automobile Tire Pressure Monitoring System WEI Yu WEI Yu 2023, 48(5): 64-67.  DOI: 10.16638/j.cnki.1671-7988.2023.05.011 Abstract ( )   PDF (886KB) ( )   As the only contact between the vehicle and the ground, the change of air pressure in the tire has a significant impact on the driving comfort, fuel economy and road safety of the vehicle. However, the driver often ignores the condition of the tire and the pressure value in the tire, which is very important for traffic. Security brings hidden dangers. Continuing reductions in the size and power consumption of active electronics and advancements in wireless communications have enabled the widespread use of wireless sensors in industrial and automotive applications. Tire pressure monitoring systems (TPMS) consist of wireless tire pressure sensors (TPS) within each tire module and a single receiver in the car, the monitoring and solution of car tire pressure has become an important development direction for safe driving. The tire pressure monitoring system designed in this paper uses the SP12 sensor, adopts the low-frequency wake-up method, and selects the ER2450 of ABLE (Aiboer) company to provide a stable power supply for powering the system. The rationality and feasibility of software design of automobile tire pressure monitoring system. References | Related Articles | Metrics

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Design and Analysis of Aerodynamics System of a Formula Car Based on FLUENT ZHANG Xuanrui 2023, 48(5): 68-72.  DOI: 10.16638/j.cnki.1671-7988.2023.05.012 Abstract ( )   PDF (1504KB) ( )   Aerodynamics system design and analysis is an important part of formula racing. The design and analysis of this paper is based on the aerodynamics package of the formula car designed by the formula team of Beijing Institute of Technology Zhuhai Campus. Firstly, a complete racing model is established by 3D modeling software CATIA, and then the model is imported into CFD software for numerical simulation. Finally, through CFD software analysis, it is concluded that the negative lift of the racing car equipped with aerodynamic system increased from -34 N to 411 N in the wind speed of 20m/s, and the resistance of the front wheel after installing the front wing is reduced by about 33%. References | Related Articles | Metrics

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Fracture Failure Analysis and Matching Design of Clutch Diaphragm Spring LIU Pei 2023, 48(5): 73-76.  DOI: 10.16638/j.cnki.1671-7988.2023.05.013 Abstract ( )   PDF (1724KB) ( )   The rupture of the clutch diaphragm spring directly leads to the damage of the clutch system, which leads to the outage of the vehicle, and the customer complains a lot. In this paper, through the diaphragm spring failure sample fracture macro analysis, scanning electron microscope (SEM) micro morphology analysis, chemical composition analysis, hardness testing analysis and metallographic and inclusion analysis, and so on, a thorough and comprehensive analysis of the clutch diaphragm spring fracture causes, find the main cause, and then find specific solutions. At the same time, the parameter matching theory of the vehicle clutch system is checked, and the reasons for the failure of the diaphragm spring are analyzed. References | Related Articles | Metrics

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Fault Analysis and Optimization of an Heavy-duty Diesel Engine Transport Support XU Jiahang 2023, 48(5): 77-80.  DOI: 10.16638/j.cnki.1671-7988.2023.05.014 Abstract ( )   PDF (1734KB) ( )   In order to solve the engine drop failure of a heavy-duty diesel engine transport support in shipping, the pre-processing software Hypermesh and the finite element analysis software Abaqus are used to complete the model construction and simulation research on the failure parts, and the causes of the engine mount support and transport support falling off are analyzed. The results show that the amount of slip between the transport support and the engine mount support exceeds the limit, resulting in the rupture of the connecting bolt between the mount support and the transport support. In this paper, a new type of integrated transport support is designed for the situation of slip over limit, and the calculation results show that the new scheme meets the design requirements in all aspects. References | Related Articles | Metrics

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Calculation of Transmission Ratio of 9-speed Automatic Transmission Based on Lever Method HE Jiayi 2023, 48(5): 81-86.  DOI: 10.16638/j.cnki.1671-7988.2023.05.015 Abstract ( )   PDF (1107KB) ( )   Multi-row planetary gear mechanism is a commonly used speed change mechanism in automobile automatic transmission. It is of great significance to analyze the transmission route and calculate the transmission ratio effectively for the design and optimization of the multi-speed transmission mechanism. Take a certain 9-speed automatic transmission developed by fast as an example. The transmission consists of 6 shift actuators and 4 planetary gear rows. Based on the motion characteristic equation of the planetary gear mechanism, the transmission route of the automatic transmission is studied by lever method, and the equivalent lever diagram of each gear is established according to the basic principle of lever, so that the transmission ratio of this complex multi-row planetary gear transmission mechanism can be calculated much simpler and clearer. The research results provide theoretical reference for the analysis, design and improvement of automatic transmission power transmission route. References | Related Articles | Metrics

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Structural Optimization Design of a Vehicle Lateral Stabilizer Bar PAN Haijie 2023, 48(5): 87-91.  DOI: 10.16638/j.cnki.1671-7988.2023.05.016 Abstract ( )   PDF (1567KB) ( )   In order to evaluate the structural rationality of the stabilizer bar and to optimize its structure, the stabilizer bar of a vehicle was analyzed. The 1/2 finite element model of this type of stabilizer bar is established, the torsional stiffness of the original structure is analyzed, and its stress cloud diagram and dangerous position are obtained. On the basis of the analysis results, aiming at reducing the maximum stress of the stabilizer bar, the structure of the stabilizer bar is optimized without significantly reducing the structural rigidity and increasing the mass. Finite element analysis is carried out for different optimization schemes, and the optimal scheme is determined according to the analysis results. In this study, the dangerous position of the stabilizer bar was determined, and its maximum stress was significantly reduced by optimizing the design. This method can provide guidance for the design scheme evaluation and structural optimization of the automobile stabilizer bar. References | Related Articles | Metrics

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Analysis of the Influence of Hydraulic Bushing and Rubber Bushing on Vehicle Comfort WU Gang 2023, 48(5): 92-95.  DOI: 10.16638/j.cnki.1671-7988.2023.05.017 Abstract ( )   PDF (1713KB) ( )   This paper expounds the influence of hydraulic bushing and rubber bushing on vehicle comfort from two aspects of theoretical analysis and practice by the computer aided engineering (CAE) vehicle model simulation, subjective evaluation and vehicle objective measurement. Compared with the rubber bush, the X-direction impact of the hydraulic bushing is reduced by 40% in the deceleration sill condition. Through the above work, for the future the project uses hydraulic bushing to lay a solid foundation. References | Related Articles | Metrics

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Design of Dust Cover for an Automobile Brake Disc Based on Topography Optimization HE Daicheng 2023, 48(5): 96-98.  DOI: 10.16638/j.cnki.1671-7988.2023.05.018 Abstract ( )   PDF (1438KB) ( )   In order to avoid vibration, noise and even failure of the dust cover of automobile brake disc during use. Based on the topography optimization method, the structure of a brake disc dust cover was designed and analyzed by using the finite element simulation analysis technology. The optimum shape structure was determined to meet the requirements of the development of a new automobile brake disc dust cover. It provides a theoretical basis for the development of dust cover of automobile brake disc. The results show that the first mode frequency of the brake disc dust cover is 118.04 Hz, which meets the requirements of new product development with a frequency greater than 100Hz. References | Related Articles | Metrics

Testing and Experiment

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Application and Experimental Study of E-motor Active Heating Technology of Electric Vehicles LI Chao 2023, 48(5): 99-105.  DOI: 10.16638/j.cnki.1671-7988.2023.05.019 Abstract ( )   PDF (1471KB) ( )   Based on an electric vehicle, the active heating function of the e-motor and it’s total vehicle thermal management control system are developed, and in order to know the real situation of performance of the active heating function, the low-temperature direct current (DC) charging and air conditioning (A/C) heating tests are carried out respectively. The verification results show that the e-motor can be used as a heat source to supply heat to the battery and A/C under the condition of parking and driving. The e-motor can output about 2 kW of heat in the condition of parking, and the heating efficiency (heat transferred to coolant ÷ power loss of the e-motor) is only about 70%. When driving at low speed (32 km/h), although the heating capacity of the motor is increased to 2.4 kW, the heating efficiency drops to 64% affected by the heat dissipation of the shell. After the vehicle speed rises to 80 km/h, the average heating power is about 3 kW, and the heating efficiency is affected by factors such as transmission loss, resulting in distortion of calculation results. Due to the low real efficiency of the active heating of the e-motor, the vehicle control system needs to limit the application scenario and the duration of this function, which not only needs to meet the rapid heating demand under a few extremely low-temperature working conditions, but also prevents excessive energy consumption. References | Related Articles | Metrics

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Analysis of Suspension K Characteristics KAN Guoqing 2023, 48(5): 106-111.  DOI: 10.16638/j.cnki.1671-7988.2023.05.020 Abstract ( )   PDF (2064KB) ( )   In car hold steady performance and development, to the prototype stage kinematics and compliance (K&C) tests necessary, under quasi-static K&C test, no incentive dynamic force of inertia, shock absorber and liner, at a slow speed to the vehicle suspension system exert a series of load and displacement of the input, output corresponding parameters such as displacement, angle and moment. The geometry kinematics and elastic kinematics of suspension are investigated, and the potential problems of the vehicle are proposed through data analysis to support the development of operating stability. This paper mainly introduces three test conditions of K characteristic wheel jump, roll and steering. Through the introduction of the test conditions, the interpretation of the test curve, and the combination of the vehicle movement conditions, the recommended direction of parameters is obtained, which has certain guiding significance for the subsequent development of operating stability performance. References | Related Articles | Metrics

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Experimental Study on the Effect of Gear Growth Ratio on Braking Torque of Parallel Hydraulic Retarder WANG Keyan 2023, 48(5): 112-116.  DOI: 10.16638/j.cnki.1671-7988.2023.05.021 Abstract ( )   PDF (1597KB) ( )   In this paper, based on the existing parallel hydraulic retarder, three kinds of retarder drive gear and passive gear with different gear input growth ratio of 2.0, 2.03 and 2.138 were designed respectively. A sample box for retarder external characteristics experiment was assembled to study the influence of input gear growth ratio on retarder braking torque performance. According to the existing experimental data of retarder, the speed ratio and braking torque curve of retarder are satisfied by theoretical calculation and design. Experimental results show that gear growth by increasing retarder ratios low speed range solve retarder braking torque smaller problems, to satisfy the market now keeping small demand, driving axle model matching retarder can be realized by limiting torque control method and the high speed smooth braking torque output, regional retarder to competing goods abroad. References | Related Articles | Metrics

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Design and Experimental Study of Lubrication System for Heavy Duty Dual Countershaft Transmission CHEN Liang 2023, 48(5): 117-121.  DOI: 10.16638/j.cnki.1671-7988.2023.05.022 Abstract ( )   PDF (1815KB) ( )   In order to improve transmission efficiency, lightweight and reliability, a lubrication system of dual countershaft transmission with forced lubrication as the core was established. According to the lubrication principle, the overall scheme layout and detailed design of oil pump circuit are carried out to complete the analysis and calculation of forced lubrication virtual oil circuit. Through innovative experimental technology and methods, establish and implement pump output flow and pressure, forced lubrication oil injection hole, transmission lubricating oil used in the determination of the amount of discharge and experiment method, comprehensively and systematically evaluate the performance of forced lubrication system, verify the validity of the design, and analyses the experimental results, through precise lubrication, 2.4 L of lubricating oil is reduced to achieve the goal of reducing cost, weight and increasing efficiency. References | Related Articles | Metrics

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Control Logic and Verified Method of Electronic Vacuum Pump for Vehicle Integration LIU Ruiting 2023, 48(5): 122-127.  DOI: 10.16638/j.cnki.1671-7988.2023.05.023 Abstract ( )   PDF (1950KB) ( )   Based on the characteristics of electronic vacuum pump products combined with the system conditions, in order to avoid the application, the paper systematically expounds the electronic vacuum pump in the vehicle application of three different control logic and different duty cycle operation choice, and provides the feasible vehicle verification method to match the vehicle application of vacuum pump. According to the introduction of the characteristics of different control logic and the selection of duty cycle, the influence on the system performance and vacuum pump, and how to better compare the electronic vacuum pump performance and the test performance to collect the relevant system data in different working conditions, so as to set the appropriate system control logic and related parameters to achieve the appropriate match between the electronic vacuum pump and system conditions, so as to ensure that the electronic vacuum pump can work normally for a long time. References | Related Articles | Metrics

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Capability Building and Operation of Corrosion Detection in BBAC R&D Laboratory LAI Zhenhua 2023, 48(5): 128-132.  DOI: 10.16638/j.cnki.1671-7988.2023.05.024 Abstract ( )   PDF (1574KB) ( )   In automobile manufacturing, coating corrosion detection has an important application in painting production quality control and metal parts release test. As Beijing Benz car production increased year by year and increase of localization suppliers, the number of corrosion detection tests gradually increased. Through integrating resources, the R&D laboratory is committed to comprehensively improving the coating corrosion detection capability and meeting Daimler recognized standards, therefore, the laboratory undertakes relevant coating corrosion detection tests and provides efficient services for the continuous production in BBAC. In this paper, the localization construction and operation of corrosion detection capability in Beijing Benz R&D laboratory is summarized, and the future work that needs to be improved is prospected. References | Related Articles | Metrics

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Vibration Test of the Bracket Auxiliary Water Tank Based on Road Load Spectrum YANG Jun 2023, 48(5): 133-137.  DOI: 10.16638/j.cnki.1671-7988.2023.05.025 Abstract ( )   PDF (2549KB) ( )   Aiming at the bracket auxiliary water tank of a vehicle type cracked during the vehicle road durability test, collect the road load spectrum of the bracket for auxiliary water tank, then calculate the total damage of the road test and synthesize the appropriate acceleration rig test drive power spectral density (PSD) based on the fatigue damage equivalence principle. The original status component which broken during the road durability test is verified by the vibration test with this PSD; the original state sample performs vibration test verification according to the PSD, the failure mode and time of the sample are consistent with the vehicle road test results, and the PSD is used to verify the accelerated vibration test of the optimized sample. The optimized sample also passes the vehicle road test certificate, which saves the road test certificate time for the development of the sample vehicle. References | Related Articles | Metrics

Process and Equipment

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Application of Integral Thermoforming Door Ring Technology in Lightweight Vehicle Body LIU Jiangbo 2023, 48(5): 138-142.  DOI: 10.16638/j.cnki.1671-7988.2023.05.026 Abstract ( )   PDF (1701KB) ( )   With the implementation of the 25% small offset collision regulations of China-insurance automotive safety index (C-IASI), how to achieve lightweight while improving the collision performance is a common problem and challenge faced by all major Oems. Based on a certain new energy vehicle, this paper finally achieved 25% small-offset collision performance improvement and significant lightweight effect through the application of integral unequal thickness thermoforming door ring. The application of the scheme has a certain reference role for the industry. References | Related Articles | Metrics

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Application of Intelligent Display Screen in Automobile Harness Industry WANG Linqi 2023, 48(5): 143-146.  DOI: 10.16638/j.cnki.1671-7988.2023.05.027 Abstract ( )   PDF (3831KB) ( )   The traditional appearance inspection method of automobile harness is that the inspector refers to the paper drawing to visually inspect the harness accessories, then measures the branch size with a tape measure, and compares it with the drawing size one by one. The inspection efficiency is low while the labor intensity is high. This paper introduces the application of a new intelligent display screen in automobile harness industry. The equipment is spliced with 4 K resolution splicing screen, which can directly display the processing drawing of automobile harness matching plate, and can place the real object on the equipment to realize 1:1 comparison between the drawing and the real object, visually observe the angle and position of automobile harness branch, and save size measurement action, reduce labor intensity and improve work efficiency. References | Related Articles | Metrics

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Injection Mold Frame Design System Based on NX LIU Hao 2023, 48(5): 147-153.  DOI: 10.16638/j.cnki.1671-7988.2023.05.028 Abstract ( )   PDF (1450KB) ( )   The article focuses on analyzing the characteristics and design methods of injection mold parts, reclassifies non-standard parts, and points out that establishing and calling the corresponding standard library of various parts is an effective way to improve the efficiency of mold design. In order to reduce unnecessary repetitive work and reduce the amount of drawing, the purpose of improving the design efficiency of the injection mold base and shortening the mold design cycle is achieved. Taking NX10.0 as the platform and the NX/OPEN secondary development technology as the tool, the design system of the injection mold base is developed by the program-based modeling method. The design system can not only generate the required mold base accurately and quickly according to the selected key parameters, but also integrates the expert knowledge and experience to reduce the designer's reliance on the design experience. Moreover, the human-computer interaction interface is friendly, the system operation is convenient, and it conforms to the domestic design standards and habits. References | Related Articles | Metrics

Automobile Education

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Analysis of Fault Diagnosis and Maintenance Technology of Automobile Powertrain WANG Hongxia1 2023, 48(5): 154-158.  DOI: 10.16638/j.cnki.1671-7988.2023.05.029 Abstract ( )   PDF (1594KB) ( )   In order to adapt to the current high demand of the automobile market, improve the solution speed of the automobile powertrain failure in the manufacturing base, so as to quickly update the automobile models and improve the efficiency of the automobile output. This paper gives a brief overview of the automobile powertrain, and through the introduction of the components of the powertrain in Guiyang Geely manufacturing base, the induction of the types of assembly failures, and the analysis of typical cases, the diagnosis and maintenance process of the powertrain failures in the base, the thinking of functional problem analysis, and the quick win scheme of the powertrain are obtained. Through technical analysis, the paper improves the maintenance efficiency of the diagnosis of the automobile powertrain. References | Related Articles | Metrics

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Construction and Optimization of the Innovative Practice System of "Power Racing Car" WANG Sheng 2023, 48(5): 159-165.  DOI: 10.16638/j.cnki.1671-7988.2023.05.030 Abstract ( )   PDF (1398KB) ( )   Based on the "123" innovation practice system, this paper aims at such problems as "low participation" "imperfect system" "difficult entry" and "superficial technical research" under the policy background of "universal innovation practice education". By building a systematic practice system, establish the platform base training, optimizing the structure of the innovation team, the way such as changing project development process of the original system is optimized, the optimized innovation practice educational system is a kind of automobile engineering as the background, with competition of science and technology as the guide, systemic strong, high popularity, depth of fusion theory and practice. Through the whole process of undergraduate and graduate training of the new three-level innovative practice education system. References | Related Articles | Metrics

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Exploration and Practice on the Talent Training Mode under the New Business Form of “Internet+” —Take the Industrial Robot Technology Specialty as an Example WANG Yulu 2023, 48(5): 166-169.  DOI: 10.16638/j.cnki.1671-7988.2023.05.031 Abstract ( )   PDF (1039KB) ( )   The core of “Internet+” form is reform, innovation and integration, which puts forward a higher requirement on the innovation and entrepreneurship ability of employees in traditional industries. According to the industrial robot technology specialty at Xianyang Vocational and Technical College, the development of current training mode is analyzed. The construction ideas of a new training mode guided by the needs of society and industry are expounded, and the specific practical methods for the new training mode are discussed. This study provides theoretical references for vocational colleges to cultivate the skilled professional talents who own the innovation and entrepreneurship ability. References | Related Articles | Metrics

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Practical Research on the Construction of Curriculum Resources of Higher Vocational Education under the Background of Big Data —Taking the Principle and Interface Technology of Single Chip Microcomputer as an Example WANG Pingjun 2023, 48(5): 170-175.  DOI: 10.16638/j.cnki.1671-7988.2023.05.032 Abstract ( )   PDF (2796KB) ( )   Under the background of big data, this paper explains the relevant requirements of the current higher vocational professional curriculum resource construction, and through the analysis of vocational education professional curriculum teaching and learning problems, puts forward teaching strategies based on the outcome based education (OBE) concept, and builds a more comprehensive and systematic professional curriculum teaching resource construction framework. Taking the professional course of Principle and Interface Technology of Single Chip Microcomputer as an example, through the practical analysis of the course's learning field, task objectives, teaching resource content, etc., it provides valuable suggestions for strengthening the construction of professional course teaching resources in higher vocational colleges. References | Related Articles | Metrics

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Application Development and Teaching Practice of Vehicle Dynamics Simulation Software LAI Fei 2023, 48(5): 176-181.  DOI: 10.16638/j.cnki.1671-7988.2023.05.033 Abstract ( )   PDF (2552KB) ( )   To improve the teaching effect of automobile theory course, the vehicle dynamics simulation software based on MATLAB graphical user interface (GUI) is established. It mainly includes the modules of vehicle power performance, fuel economy, braking performance, handling stability and ride comfort. During the teaching process of automobile theory, on the one hand, students can set corresponding parameters in the software according to their own requirements to view the corresponding response visually and clearly, and deepen their understanding of knowledge points; on the other hand, the auxiliary software can also stimulate the students' interest in learning and improve their subjective initiative, so as to achieve better teaching results. References | Related Articles | Metrics

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Teaching Reform and Exploration Practice of Electric Vehicle Maintenance Course Based on “Post Class Certificate Competition Innovation” YU Ruxing 2023, 48(5): 182-186.  DOI: 10.16638/j.cnki.1671-7988.2023.05.034 Abstract ( )   PDF (1473KB) ( )   New requirements for the cultivation of professional talents of colleges has been putted forward in china's new era, In order to improve the quality of talent training, this paper explores the teaching reform of the electric vehicle inspection and repair course based on “post class certificate competition innovation”. First of all, this paper analyzes the situation of the teaching reform, and analyzes the necessity of integrating the course with 1+X certificate and vocational skills competition of vocational colleges and cultivation of students' innovation ability, “post class certificate competition innovation” integrating meet the needs of modern society, and then expounds the specific measures for the reform of teaching content, post courses, content of courses, teaching method, evaluation method and so on, the reform practice has achieved good results, and has certain promotion value. References | Related Articles | Metrics

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Construction of “345”Curriculum System for Automobile Maintenance Major in New Era DENG Chi 2023, 48(5): 187-193.  DOI: 10.16638/j.cnki.1671-7988.2023.05.035 Abstract ( )   PDF (1542KB) ( )   Taking the automobile maintenance major of Qingdao institute of technology as an example, based on the demand and development trend of talents in automobile maintenance industry, combined with the national policy, and according to the requirements of our institute’s own educational reform, the current talent training program is adjusted, to realize the talent training mode of layering and triage. According to the post demand of the automobile industry, combined with the four-in-one idea of "Integration of certificate and class competition", on the basis of a large number of investigations and studies, this paper analyzes the students’cognitive laws, students’ learning conditions, reorganizes and adjusts the professional courses of automobile maintenance, aiming at the principle of taking the students as the center, taking the typical work task as the carrier, taking the cultivation of the students comprehensive professional ability as the goal, this paper puts forward a kind of innovative modular curriculum system— “345” curriculum system. The construction of the curriculum system can promote the integrated teaching reform of automobile maintenance specialty and improve teachers'professional ability.Strengthen school-enterprise cooperation, take the real work tasks of enterprises as the carrier, innovate the integrated teaching of work-study combination, form the six-in-one curriculum reform implementation mode of "post class competition certificate creation", train high-level and high-skilled compound technical talents, realize the five-year continuous improvement of students'comprehensive vocational ability as "social and professional people", improve students' employment rate, and enhance students' ability to transfer jobs. References | Related Articles | Metrics

Standards Regulations Management

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Analysis of the Performance Test and Evaluation Standard System of Vehicle Hydrogen Fuel Cell System GUO Senjie 2023, 48(5): 194-198.  DOI: 10.16638/j.cnki.1671-7988.2023.05.036 Abstract ( )   PDF (1321KB) ( )   In order to further promote the improvement and unification of the performance test standards for vehicle hydrogen fuel cell systems, and promote the comprehensive development of the national vehicle fuel cell industry standard system.This paper analyzes the relevant standards of hydrogen fuel cells in various application scenarios at home and abroad for performance testing, and relevant test standards that can be used for performance testing of hydrogen fuel cell systems for vehicles are extracted. By comparing the test methods and evaluation indexes of performance testing in each standard, the applicability of each standard to hydrogen fuel cell performance testing in vehicle scenarios is analyzed, and the more comprehensive performance test and evaluation standards of the vehicle hydrogen fuel cell system are put forward. References | Related Articles | Metrics

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Noise Limits and Measurement Methods of Operating Noise of Special Purpose Vehicles WU Chunying 2023, 48(5): 199-205.  DOI: 10.16638/j.cnki.1671-7988.2023.05.037 Abstract ( )   PDF (1470KB) ( )   Special purpose vehicles have brought great challenges to vehicle noise management and control due to their multiple models, wide functions and complex use scenarios. Through combing China's special-purpose vehicle standards, this paper focuses on the analysis of China's specialpurpose vehicle noise limits and operating noise measurement methods. The current operating noise limits and measurement methods have the characteristics of long standard age, old indicators, and large differences in measurement methods, which do not meet the current market situation and the needs of operation noise management and control. Combined with domestic noise pollution management and the development trend of international automobile noise standards, this paper suggest that relevant domestic institutions should carry out targeted research as soon as possible, formulate unified special-purpose vehicle operating noise limits and measurement method standards in a timely manner, and seize international research hotspots. References | Related Articles | Metrics

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Optimization and Verification of Process Parameters for Vehicle Identification Label WANG Yi 2023, 48(5): 206-212.  DOI: 10.16638/j.cnki.1671-7988.2023.05.038 Abstract ( )   PDF (1849KB) ( )   In order to improve anti-counterfeiting function of vehicles and eradicate stealing vehicles, a research for process variables of vehicle identification label with anti-counterfeiting function is optimized and verified according to Taguchi research method. Firstly, in the many process parameters, the three parameters of coating weight, material weight and the proportion of fluorescent marks are determined as the deteriorating factors affecting the label quality. The peel strength is the observed value and the noise is environment temperature. These elements are used to build an L4 orthogonal matrix. Then the test is designed to get a result, that coating weight is 40～50 g/m2 , material weight is 50 g/m2 and the proportion of fluorescent marks is 5%. The label is free of fracture and deformation, and the quality is the best. Finally, The sub-system test and vehicle assembly test are used to verify that label quality cost, assembly cost and percent defective can be reduced and the system robust function is improved with optimized variables. References | Related Articles | Metrics

Overview

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Development Status of Vapor Emission Control Technology in On-board Fuel System ZHANG Enhui 2023, 48(5): 213-218.  DOI: 10.16638/j.cnki.1671-7988.2023.05.039 Abstract ( )   PDF (1431KB) ( )   The vapor emission control technology effectively suppresses the vapor emission pollution in automobile fuel system, which is of great significance in the current energy shortage and environmental crisis. This paper briefly describes the development process of vapor emission control technology at home and abroad and the implementation process of relevant laws and standards, systematically sorts out the research results of existing vapor emission control technology, and analyzes the existing deficiencies of on-board vapor emission control technology. It is proposed that the combination of active vapor suppression device and electronic control is the main trend of on-board vapor emission control technology. References | Related Articles | Metrics

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Application of DFMEA in Air Compressor Design of Fuel Cell Vehicles LIANG Xincheng 2023, 48(5): 219-224.  DOI: 10.16638/j.cnki.1671-7988.2023.05.040 Abstract ( )   PDF (1457KB) ( )   Hydrogen is of the outstanding characteristics including abundant resources, high calorific value and no pollution, so it is the most ideal secondary energy for fuel cell vehicles. Considering air compressor is viewed as the key assembly for the fuel cell, it is extremely significant to master the design and manufacturing technology for the core components. In fact, the application of traditional design methods frequently leads to problems such as accuracy, reliability and life during the development process for the air bearings, compressor impeller, shell, etc., and the cost is increased distinctly by the repeated modifications. Hence, design potential failure mode and effects analysis References | Related Articles | Metrics