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30 October 2022, Volume 47 Issue 20 Previous Issue    Next 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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Finite Element Analysis of EPS Worm Gear Based on ABAQUS HU Zhifeng 2022, 47(20): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2022.020.001 Abstract ( )   PDF (1161KB) ( )   In the field of new energy vehicles, electric power steering system is one of its core technologies. As an important part of the electric power steering system, the contact characteristics of the worm gear and its transmission efficiency directly affect the performance of the steering system. Therefore, the worm pair in an electric power steering system is taken as the research object. The solid model is modeled by KISSsoft software, and then the solid model is imported into HyperMesh software for mesh generation. Finally, the rotation process of the worm pair is simulated by ABAQUS software, and the static contact analysis is carried out at different positions in the process. The contact stress distribution law of the meshing tooth surface of the worm pair when the worm wheel rotates one tooth is studied. The contact strength of the meshing surface is checked, and the influence of the friction coefficient of the worm pair tooth surface on the transmission efficiency is analyzed. References | Related Articles | Metrics

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Energy Management Strategy of Plug-in Hybrid Electric Vehicles Based on Q-learning TIAN Zejie 2022, 47(20): 5-8.  DOI: 10.16638/j.cnki.1671-7988.2022.020.002 Abstract ( )   PDF (942KB) ( )   Aiming at the energy management problem of plug-in hybrid electric vehicles, a strategy based on the Q-learning algorithm in reinforcement learning is proposed. Take battery state of charge and required power as state variables, take auxiliary power unit output power as control variable, and use Temporal-Difference Learning algorithm to update the action-state value in real time. Comparing the results with the global optimal algorithm pontryagin minimum principle, the total price of the Q-learning strategy is only 1.57 yuan more expensive under the Chinese type city bus circle of nearly 100 kilometers, which shows the effectiveness of the Q-learning strategy. From the perspective of application, this strategy is conducive to improving the overall economic level of vehicle. References | Related Articles | Metrics

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An Automatic Replenishment Scheme of Low-voltage Battery WANG Xiaoguang 2022, 47(20): 9-13.  DOI: 10.16638/j.cnki.1671-7988.2022.020.003 Abstract ( )   PDF (636KB) ( )   The problem of low-voltage battery power loss of vehicles is a common problem that plagues the use of vehicles. This article introduces an automatic replenishment scheme of lowvoltage battery of new energy vehicles. The vehicle gateway control unit is periodically awakened to monitor the battery power status. The gateway control unit does not wake up the entire vehicle during power detection, and basically does not consume low-voltage battery power. When it is detected that the low-voltage battery power is lower than the set threshold, the gateway control unit sends a message to control the high-voltage power-on, and recharges the low-voltage battery in a silent manner, so that the vehicle can be parked for a long time with power, which eliminates the user's troubles and greatly improves user's experience. References | Related Articles | Metrics

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Improvement of Quality Management in Manufacturing Process of New Energy Vehicles Using PFMEA YANG Weijian 2022, 47(20): 14-18.  DOI: 10.16638/j.cnki.1671-7988.2022.020.004 Abstract ( )   PDF (536KB) ( )   This paper finds that there are some problems such as unclear standards and unrealistic improvement measures in the process of preparing the potential failure mode and effects analysis document of the final assembly of the engine plant, through analyzing the potential failure mode and effects analysis of the final assembly of a domestic first-class engine plant on the spot. Through extensive research on the actual needs of engine plants and in-depth discussion with the staffing, the precautions in the preparation process of the final assembly potential failure mode and effects analysis are summarized from experience, which could help the engineers improve the preparation process of the final assembly potential failure mode and effects analysis, and make the prepared final assembly potential failure mode and effects analysis more closely linked with the quality management of the final assembly process of new energy vehicles. Potential failure mode and effects analysis can truly and effectively improve the quality assurance capability of the final assembly process of new energy vehicles, reduce the occurrence rate of the quality failures of the final assembly process of new energy vehicles from the source of manufacturing, and effectively control the potential failure mode of the final assembly manufacturing process in the vehicle development stage, so as to greatly reduce the cost of process improvement of the final assembly after the mass production of vehicles and avoid the occurrence of major quality failures of large batches of vehicles. References | Related Articles | Metrics

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Research on the Energy Management Strategy of Hybrid Electric Vehicles Based on ECMS-MPC HE Qi 2022, 47(20): 19-22.  DOI: 10.16638/j.cnki.1671-7988.2022.020.005 Abstract ( )   PDF (1114KB) ( )   Under the background of energy conservation and emission reduction, energy management and control strategy is the key factor to determine the power, economy and emission of hybrid electric vehicles. In this paper, the mathematical model of the single axle parallel hybrid electric vehicle and its components is established based on MATLAB. On the basis of system modeling, an energy management strategy based on the minimum equivalent fuel consumption prediction model control (ECMS-MPC) is proposed and compared with the energy management and control strategy of dynamic programming (DP). Simulation results show that ECMS-MPC control strategy is close to DP energy management and control strategy in technical results. In terms of computing efficiency, ECMS-MPC control strategy is 6 times higher than DP energy management and control strategy. The superiority of ECMS-MPC control strategy is demonstrated. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on Vehicle Formation Cooperative Driving Simulation System GUO Peng 2022, 47(20): 23-28.  DOI: 10.16638/j.cnki.1671-7988.2022.020.006 Abstract ( )   PDF (983KB) ( )   In view of the cooperative driving function of intelligent and connected vehicle, a simulation system based on vehicle wireless communication (C-V2X) technology is designed. According to the vehicle cooperative driving control process (vehicle formation, vehicle entering, stable driving and vehicle leaving), an intelligent driver model is built to control the vehicle, and the vehicle queue is guided by the pilot follow method.Finally, the driving scene is designed in Prescan and communicated through direct connection communication (PC5) mode 4 communication protocol for simulation verification. The results show that the built vehicle formation cooperative control simulation system can effectively complete the queue control behaviors such as the formation of vehicle queue, vehicle entering the queue, stable driving in the queue and vehicle leaving the queue, and keep the queue running at a stable distance according to the automatic driving control strategy. References | Related Articles | Metrics

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LiDAR-based Lightweight Localization and Mapping Method GONG Keyang 2022, 47(20): 29-33.  DOI: 10.16638/j.cnki.1671-7988.2022.020.007 Abstract ( )   PDF (1994KB) ( )   With the advancement of science and technology, the development of autonomous driving is in full swing. As one of its key technologies, localization and mapping methods mainly rely on Global Positioning Ststem (GPS), which are easily affected by weather and high-rise buildings. Considering the limitations of existing methods, this paper proposes a lightweight localization and mapping method based on Lidar. The method is mainly composed of four parts: front-end registration, loop closure detection, back- end optimization and mapping. Each part extracts, matches, identifies, and optimizes the collected data of the surrounding environment to obtain both accurate and robust localization and mapping effects, and establishes the basis for perception, planning, decision-making, and control of autonomous driving. References | Related Articles | Metrics

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Lane Changing Trajectory-planning and Tracking Control for Autonomous Vehicle at Curves HOU Baolong 2022, 47(20): 34-38.  DOI: 10.16638/j.cnki.1671-7988.2022.020.008 Abstract ( )   PDF (1033KB) ( )   At present, the autonomous driving system of vehicles has less involvement in curve road conditions. Based on Frenet coordinate system, aiming at the lane changing strategy of autonomous vehicles at curves, this paper proposes a trajectory-planning algorithm for handling dynamic obstacles with transverse and longitudinal decoupling. It solves the problem that the traditional coupling planning is difficult to take into account the curve fitting efficiency and safety. The transverse planning is based on the quasi-uniform cubic B-spline curve, while the longitudinal planning is based on dynamic planning and quadratic optimization. The model predictive control is used to track and control the lane changing trajectory. Finally, Matlab/Simulink simulation is used to verify that the proposed curve lane changing trajectory algorithm can change lanes smoothly and avoid dynamic obstacles safely. References | Related Articles | Metrics

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Analysis on Application Scenarios of Intelligent Network Connected Heavy Commercial Vehicles QIU Mingan 2022, 47(20): 39-43.  DOI: 10.16638/j.cnki.1671-7988.2022.020.009 Abstract ( )   PDF (844KB) ( )   In rencent years,the automobile industry has gradually developed towards intelligence and networking, which is related to the cross-border combination of multifields and industries. The development characteristics and technical path of joint heavy commercial vehicles focus on open roads, offline highways, intra-port ports, closed mining areas and urban sanitation. The scenario is discussed, the focus of the development of intelligent networking technology for heavy commercial vehicles in China is analyzed, and comprehensively focuses on commercial value, market scale and technological success. Familiarity and resource investment predict the priority of scene landing, and put forward corresponding suggestions in combination with the future development trend. References | Related Articles | Metrics

Design and Research

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Simulation of the Sinking Volume of a Rigid Wheel in Fine Sandy Soil LIU Tianyu 2022, 47(20): 44-48.  DOI: 10.16638/j.cnki.1671-7988.2022.020.010 Abstract ( )   PDF (1264KB) ( )   Field unmanned exploration vehicles are mostly used on the desert or lunar surface to realize the functions of exploration or search and rescue. In order to ensure the traction performance of the rover and improve the working efficiency of the rover, the wheel surface characteristics are optimized. Based on the traditional vehicle ground mechanics theory, the finite element model of a rigid wheel-fine sandy soil is established, and the effects of three wheel surface characteristics on the static sinkage, dynamic sinkage and traction performance of a rigid wheel are analyzed. The simulation results show that the model can better simulate the interaction characteristics of a rigid wheel-fine sandy soil. Compared with rectangular spikes, trapezoidal spikes have better anti-sinking performance. When the number and height of trapezoidal spikes remain unchanged, the length of the top edge is positively correlated with the anti-sinking performance, and if the length is too long or too short, the periodic fluctuation amplitude of the tension of the rigid wheel drawbar increases. Selecting an appropriate top edge length can have good sinking characteristics and traction performance. References | Related Articles | Metrics

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Design and Analysis of One-way Screw Rod Bearing-electro-hydraulic Energy-feedback Suspension WAN Yiyu 2022, 47(20): 49-53.  DOI: 10.16638/j.cnki.1671-7988.2022.020.011 Abstract ( )   PDF (1349KB) ( )   As one of the most important structures in a automobile, the suspension plays an important role in its driving process. The vibration and impact force generated by the action and reaction of the tire and the road surface are handled by the springs and elastic elements in the suspension so that the mechanical energy is converted into heat energy in the air. The utilization rate of resources and recycling performance of automobiles can be improved by improving the existing energy feedback suspension and using the energy-regenerative suspension to collect and use energy to a certain extent, which is a new trend of environment-friendly automobile technology. In this paper, based on the existing technology and suspension model, the original mechanism is improved, and a new type of hydraulic electromagnetic energy-regenerative suspension is designed by using the relevant design and modeling software. Then the common shortcomings of the existing energy-regenerative suspension are pointed out and improvement measures are put forward. Finally an optimized one-way lead-screw-hydraulic electromagnetic energy-regenerative suspension is proposed, which is new, and economically efficient. References | Related Articles | Metrics

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Breakdown Analysis and Optimization of Intercooling Tube Support for an Engine LI Yanjun 2022, 47(20): 54-57.  DOI: 10.16638/j.cnki.1671-7988.2022.020.012 Abstract ( )   PDF (1515KB) ( )   In this paper, the intercooling tube system of an engine is analyzed. Hypermesh is used to conduct preliminary processing on the model. The deformation and strength of the intercooling tube system are analyzed. Abaqus is used in the structural simulation analysis process. The structural simulation analysis of the breakdown parts was carried out. According to the calculation results, the weak points are improved and optimized. By changing the structure and thickening the plate, the stiffness of the intercooling tube system is improved, and the deformation of the intercooling tube support is reduced. The optimized support improved the deformation of the intercooling tube support in the original scheme and effectively solves the market breakdown. References | Related Articles | Metrics

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Analysis and Optimization of Finite Element Mode of A Diesel Engine Shield XU Jiahang 2022, 47(20): 58-61.  DOI: 10.16638/j.cnki.1671-7988.2022.020.013 Abstract ( )   PDF (2982KB) ( )   In order to improve the vibration problem of marine diesel engine shield, this paper simulates the structure of a marine diesel engine shield based on finite element method. HyperMesh is used to complete the pre-processing of the shield, and ABAQUS is used to check the mode of the shield. The calculation results show that the first three modes of the marine diesel engine shield are less than 1.2 times of the excitation frequency corresponding to the rated speed of the engine, so it is easy to have resonance when working, and the modes do not meet the design requirements. After analyzing the vibration types and frequency of the shield mode, the structure of the shield is optimized and strengthened. The calculation results show that the optimized shield mode meets the design requirements. This paper has some reference significance for the structural design of shields. References | Related Articles | Metrics

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Measures to Solve the Electronic Gear Shifter Noise Issue on Some Vehicle ZHU Simin 2022, 47(20): 62-65.  DOI: 10.16638/j.cnki.1671-7988.2022.020.014 Abstract ( )   PDF (2853KB) ( )   As the continuous reduction of vehicle background noise, the noise requirements of the electronic components in the vehicle are getting higher and higher. This paper mainly introduces the working noise of a knob electronic gear shifter of some vehicle, the article combined with the internal structure and functional principle of the electronic gear shifter, then in detail describes the problem analysis and solutions verification. Finally, the paper greatly reduces the working noise of the electronic gear shifter. The analysis method and noise improvement ideas in this paper have good guiding significance for other knob electronic gear shifters design. References | Related Articles | Metrics

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Sensitivity Analysis and Optimization of Steering Fluctuation of Double Cross Universal Joint Based on Adams/Insight LI Liang 2022, 47(20): 66-70.  DOI: 10.16638/j.cnki.1671-7988.2022.020.015 Abstract ( )   PDF (1231KB) ( )   The cross universal joint is simple in structure, reliable in transmission, and allows a large included angle between the two transmission shafts. Therefore, the automobile steering system uses the cross universal joint to transmit motion. When there is an angle between the input shaft and the output shaft, the angular velocity between the input shaft and the output shaft is different. For the steering system using universal joint to transmit motion, there is non-linearity between the input of steering wheel and the output of tire angle, which affects the driving quality. It is important to reasonably arrange the steering joint phase angle. Based on a double cross universal joint steering column, the causes of universal joint transmission speed fluctuation are analyzed. The front suspension half car model is built according to the given parameters, and the influence of different steering joint phase difference on the fluctuation is analyzed based on Adams/Car and Adams/Insight. The influence contribution of different phase angle on the steering fluctuation is identified iteratively, and the universal joint fork is further optimized to reduce the input-output shaft speed fluctuation and improve the steering quality of the whole car. References | Related Articles | Metrics

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Simulation Test on Hydraulic Electrical Active Suspension Based on Slide Mode Control ZHANG Han 2022, 47(20): 71-76.  DOI: 10.16638/j.cnki.1671-7988.2022.020.016 Abstract ( )   PDF (1240KB) ( )   A slide mode controller was designed based on a hydraulic electromagnetic active suspension, then the amplitude frequency characteristic of hydraulic electromagnetic active suspension based on slide mode controller was analyzed. Firstly, the structure and working principle of hydraulic electromagnetic active suspension was described. Secondly, a two degree of dynamical model with MATLAB/Simulink was constructed. Thirdly, the slide mode controller was designed, and then the simulation test was contructed. The simulation results showed that the index of hydraulic electromagnetic active suspension was smaller than the traditional suspension. References | Related Articles | Metrics

Testing and Experiment

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Study on Durability Index of Shift System of Automatic Transmission Light Logistics Commercial Vehicles CUI Gang 2022, 47(20): 77-82.  DOI: 10.16638/j.cnki.1671-7988.2022.020.017 Abstract ( )   PDF (1347KB) ( )   Automatic transmission commercial vehicles, especially logistics vehicles mainly carried in urban areas, put forward the higher durability requirement for the shift system of automatic transmission because of their complex operating conditions, low average driving speed and frequent starting and shifting. Therefore, it is necessary to set a reasonable durability index for the shift system at the early stage of automatic transmission product design and development, then carry out design, development and test verification based on the durability target, so as to ensure the reliability of the transmission shift system from the design source. This paper investigated the actual application road conditions of a commercial logistics vehicle put into Hefei area, analyzed and screened the representative urban and suburban road conditions, tracked and collected a large number of road condition data, used the Cruise software for simulation calculation and statistical analysis, and finally calculated the cumulative shift times and shift times of each gear based on the life goal according to the proportion of each road condition and load proportion of the target vehicle, which could provide a theoretical basis for the setting of durability index of shift system. References | Related Articles | Metrics

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Optimization Analysis of Light Bus Acceleration Booming HU Xianneng 2022, 47(20): 83-89.  DOI: 10.16638/j.cnki.1671-7988.2022.020.018 Abstract ( )   PDF (2412KB) ( )   In view of the acceleration booming problem in the development of a light bus, the transmission path and response of the vehicle were analyzed, and it was determined that the booming noise was caused by the constraint mode of the front retaining beam and the second-order excitation resonance of the engine. Computer aided engineering(CAE) simulation software was used to analyze the front retaining beam, and the optimization scheme of local strengthening was proposed. Combined with the energy of the frequency of weakening problem of dynamic vibration absorber, the optimization of accelerated booming problem was realized. The vehicle was verified based on the optimization scheme, and the results showed that the booming noise was significantly optimized during the acceleration process, which effectively improved the subjective perception of the interior acceleration noise. References | Related Articles | Metrics

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Calculation and Matching of Hydraulic Steering System of a Certain Commercial Vehicle LIU Jieling 2022, 47(20): 90-94.  DOI: 10.16638/j.cnki.1671-7988.2022.020.019 Abstract ( )   PDF (1371KB) ( )   Steering system directly affects the stability of the vehicle and the safety of the passengers. Based on the matching of hydraulic power system of a certain commercial vehicle steering system, this paper describes the calculation of various components parameters of the power system in detail, and matches each system to make sure reliability and safety. The analysis and calculation methods in this paper provide a certain reference signficance for hydraulic power steering system design and application. References | Related Articles | Metrics

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Automatic Testing of Automotive ECU UDS Diagnostics XU Yongxin 2022, 47(20): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2022.020.020 Abstract ( )   PDF (1466KB) ( )   This paper introducs an automatic test method for the unified diagnostic services diagnostic system of automotive electronic control unit, which can realize the automatic test for data flow, and can also carry out automatic testing of actuator test and service diagnosis through secure access of electronic control unit. Finally, an example verifies that the automatic testing has advantages of high efficiency, consistency and simplicity. References | Related Articles | Metrics

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Analysis of Beijing Bus Emission Characteristics under the Fifth Stage of China Based on OBD Online Monitoring Technology ZHANG Chao 2022, 47(20): 100-103.  DOI: 10.16638/j.cnki.1671-7988.2022.020.021 Abstract ( )   PDF (1286KB) ( )   Experiments were conducted on three major emission reduction technical routes including China's fifth-stage city bus including Selective Catalytic Reduction, Exhaust Gas Recirculation+ Diesel Oxidation Catalyst+Diesel Particulate Filter and natural gas buses. The general packet radio service (GPRS) communication module of each bus transmits the collected data to the remote monitoring platform server at a frequency of 1 Hz. The NOx emission rate is calculated based on the NOx data to determine the NOx emissions of the vehicle under different driving conditions and in each speed range. The results indicate that the single Selective Catalytic Reduction post-treatment mode shows a higher NOx emission rate and needs to be improved. The post-treatment Exhaust Gas Recirculation+Diesel Oxidation Catalyst+Diesel Particulate Filter bus shows a lower emission rate and is considered to be the optimal post-processing method within the research range. References | Related Articles | Metrics

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Using CFD Software to Analyze the Aerodynamic of SUV and RV in the Flow Field ZHANG Yongqin 2022, 47(20): 104-109.  DOI: 10.16638/j.cnki.1671-7988.2022.020.022 Abstract ( )   PDF (2130KB) ( )   In order to study the aerodynamic of different vehicle types in the flow field, ANSYS is used to build the modeling of sport utility vehicle (SUV) and recreational vehicle, which are imported into computational fluid dynamics (CFD) flow field analysis software to calculate and analyze the distribution laws of the pressure, medium flow rate and turbulent energy of sport utility vehicle (SUV) and recreational vehicle in two speeds (60 km/h, 80 km/h) driving conditions. It is found that the distribution laws of pressure, speed and turbulent energy in the flow field are roughly same under two conditions and pressure is easily occurred at the front of vehicles and the tires concentrated. Besides, the pressure, speed, and turbulent energy at a driving speed of 60 km/h are overall less than the that at 80 km/h. This study can be used as a reference for the optimization design of two-car vehicle models. References | Related Articles | Metrics

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Studying of Crashworthiness Based on Load Transmission CHEN Dongmin 2022, 47(20): 110-115.  DOI: 10.16638/j.cnki.1671-7988.2022.020.023 Abstract ( )   PDF (11622KB) ( )   In order to improve the safety of vehicle in frontal crash, load transmission in auto-body structure was investigated. The method of optimizing performance of crash is summarized based on it. In the specific case of body structure, modeling the load transmission path in frontal offset impact. The improved scheme is proposed based on the foundation of load transfer path while optimizing the intrusion. Optimization result indicates that the scheme has a positive effect on improving crashworthiness in frontal offset impact. References | Related Articles | Metrics

Process and Equipment

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Welding Fatigue Analysis Based on Super Element Theory CHEN Yu 2022, 47(20): 116-123.  DOI: 10.16638/j.cnki.1671-7988.2022.020.024 Abstract ( )   PDF (2573KB) ( )   The purpose of this paper is to solve the problem of laser welding cracking in the fatigue condition of automobile tailgate. In order to reflect accurately the laser welding cracking in the tailgate fatigue condition, the super element theory was introduced to establish a refined model for laser welding fatigue analysis. Through the detailed model of laser welding near the crack area, a corrected multi-dimensional stiffness matrix was obtained, and the nonlinear material property calibration of the sealing strip was introduced, which simulated accurately the nonlinear dynamic performance of the automotive tailgate seal under the high strain rate, and effectively improved the calculation efficiency of laser welding of the vehicle tailgate and the risk prediction accuracy of fatigue cracking. Finally, the rationality and accuracy of the refined fatigue model were verified by relevant tests, which effectively improved the tailgate structure and reduced the experimental cycle and cost. References | Related Articles | Metrics

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Analysis of Process Optimization and Cost Reduction of Dynamic Balance for Commercial Vehicle Wheels WU Shuangqiang 2022, 47(20): 124-127.  DOI: 10.16638/j.cnki.1671-7988.2022.020.025 Abstract ( )   PDF (1086KB) ( )   In the daily market visit, it is found that the counterweight blocks assembled on wheels of our company are more and heavier than those assembled by peers, so it is possible to reduce the manufacturing cost through process optimization. In order to solve this problem, this paper analyzed and verified the feasibility of process optimization and cost reduction of dynamic balance of commercial vehicle wheels from the aspects of market research, quality improvement of related parts, previous car repair experience and real car market verification. Finally, it is considered that it is feasible for commercial vehicles to make only the dynamic balance of front wheel, and the rear wheel and spare wheel do not make dynamic balance. Through the process optimization of dynamic balance of wheels, the cost of dynamic balance of each vehicle is reduced by about 82% (take 6×4 as an example), which greatly reduces the cost of wheel dynamic balance of our company, and the effect of cost reduction is significant. References | Related Articles | Metrics

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Development and Application of Sub-assembly Auxiliary Equipment for Windshield of Commercial Vehicle Cab GAO Xiaobin 2022, 47(20): 128-132.  DOI: 10.16638/j.cnki.1671-7988.2022.020.026 Abstract ( )   PDF (1856KB) ( )   The windshield of commercial vehicle cab is not only heavy, but also large in shape. Before the windshield of the company's conventional models is installed on the cab, it is necessary to carry out the sub-assembly of the embedded sealant strip. During this process, employees need to bend over and walk under heavy loads. The intensity is very high and seriously affects the occupational health of employees. This paper mainly expounds that the design team must solve the problem that the windshield sub-assembly operation is labor-intensive and affects the occupational health of employees. By analyzing the job site environment and employee workflow, using technical skills, we proposed design ideas, and finally decided on the design of auxiliary equipment. According to the plan, the team carried out grasping design, controlling design, flipping design and transferring design, as well as 3D testing, motion simulation and functional verification. Through the above methods, the auxiliary equipment was successfully put into the site and recognized by the operating employees. After the auxiliary equipment was put into use, the labor intensity of the windshield assembly operation was completely solved, and the occupational health of employees was guaranteed. References | Related Articles | Metrics

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Body Aluminum Stud Welding Quality Research and Application ZHANG Xiaole 2022, 47(20): 133-138.  DOI: 10.16638/j.cnki.1671-7988.2022.020.027 Abstract ( )   PDF (5392KB) ( )   Stud welding is an important joint technology in automobile manufacture, high stud loose and rework rate are always the main issue. Especially for Aluminum stud welding, there are more factors influencing it. In this article, we focus on an Aluminum stud in front wheelhouse, from statistics, we find the stud with the highest loose rate. The issue is analyzed from equipment, material and welding parameter. Equipment is a critical factor of welding quality stability, welding angle influences the shape of penetration, and then influences strength. Under make equipment stable, welding vertical to part, and then we optimize welding parameter. By setting different welding current and time, comparing welding shape and stud loose quantity, we get the best strategy to make better welding quality in normal production. References | Related Articles | Metrics

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Development and Use of Fast Locking Steering Column Telescopic Shaft Tooling ZHAO Xiaojie 2022, 47(20): 139-143.  DOI: 10.16638/j.cnki.1671-7988.2022.020.028 Abstract ( )   PDF (2748KB) ( )   A bolt and fast locking connection method is usually used between the steering column and the steering coupling shaft of an automobile. This paper compares the different connection methods and structures between the steering column and the steering coupling shaft. According to the assembly requirements of the steering telescopic shaft, combined with the characteristics of the traditional tooling, a new fast locking tooling is proposed. The superiority of the new tooling is verified, the assembly efficiency of the vehicle parts is improved, and it has good engineering practical value. References | Related Articles | Metrics

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Wear Failure Analysis of Piston Skirt YI Guoliang 2022, 47(20): 144-147.  DOI: 10.16638/j.cnki.1671-7988.2022.020.029 Abstract ( )   PDF (3331KB) ( )   During the driving of an automobile engine, the user feedbacks that the engine jitter is serious and the noise is large. The engine was disassembled for inspection, and it was found that the piston skirt was seriously worn and the material fell off. In this paper, the failure piston is analyzed in detail from the aspects of macro inspection of piston wear parts, piston hardness, chemical composition and metallographic structure. It is found that the content of iron in the chemical composition of the piston exceeds the standard, and there are coarse fishbone and needle iron impurities in the alloy. The brittle and hard inclusions produce cracks under the stress of the piston under service conditions, and finally destabilize, expand and fall off, resulting in piston failure,to provide some reference for solving this type of problem. References | Related Articles | Metrics

Automobile Education

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Research and Teaching Practice on Improving Online Teaching Quality CHENG Jinrun 2022, 47(20): 148-152.  DOI: 10.16638/j.cnki.1671-7988.2022.020.030 Abstract ( )   PDF (1005KB) ( )   The occurrence of public health emergencies has created new demands for online teaching. With the support of the school's teaching reform project, the quality improvement method of the online teaching mode was studied, and the teaching practice was carried out with the "automobile culture" general elective course as the object, the teaching concept was reformed, and the online teaching system was reconstructed. Improve the teaching design. Feedback on teaching effectiveness shows that the design of teaching methods adapted to local conditions can effectively improve the quality of online teaching. References | Related Articles | Metrics

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Innovative Practice of Application-oriented Undergraduate Teaching Integrating Teaching Data YANG Xuefeng 2022, 47(20): 153-156.  DOI: 10.16638/j.cnki.1671-7988.2022.020.031 Abstract ( )   PDF (977KB) ( )   As teaching data in the education teaching application, through analyzing the characteristics of the students' learning, online learning resources, student assignments and exams, students learning efficiency and learning evaluation, to guide the teaching design and teaching reflection, comprehensive teaching data as well as the four class, based on data fusion for online learning and classroom learning and teaching reflection, promote the teaching reform. The hybrid teaching mode of "four-in-one multi-education" and "Automobile Chassis Construction" has been formed, which is suitable for applied undergraduate students. Using teaching data to deduce the teaching design, through the practice of training students to test the practical application of the teaching model, the model has been unanimously praised by teachers and students, has a certain reference for applied undergraduate engineering teaching. References | Related Articles | Metrics

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Analysis on the Teaching Development of Vehicle Engineering Specialty under the Background of Emerging Engineering Education LI Jiaqiang 2022, 47(20): 157-160.  DOI: 10.16638/j.cnki.1671-7988.2022.020.032 Abstract ( )   PDF (957KB) ( )   Under the requirement of the development of "emerging engineering education" teaching, higher requirements are put forward for the teaching of traditional vehicle engineering specialty. In order to make teachers' teaching and students' development meet the development needs of "emerging engineering education", the problems existing in the teaching process were analyzed and the development methods were studied. In order to enable students majoring in vehicle engineering to reserve and apply interdisciplinary knowledge, it is necessary to rationally plan basic courses of discipline, basic courses of specialty, core courses of specialty and extension courses of specialty. In the teaching practice, students should not only deepen their understanding of theoretical knowledge, but also guide them to comprehensively use the knowledge of various disciplines. Actively promote students to participate in the discipline related competitions, through solving practical problems to train students to skillfully use the knowledge of the relevant disciplines. Through the above approaches, students can master the knowledge of various disciplines and meet the development requirements of "emerging engineering education" students majoring in vehicle engineering. References | Related Articles | Metrics

Standards Regulations Management

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Application of Electronic Vehicle Identification in Operation Management of Automotive Proving Ground SHI Lei 2022, 47(20): 161-166.  DOI: 10.16638/j.cnki.1671-7988.2022.020.033 Abstract ( )   PDF (3828KB) ( )   Safety and efficiency has always been the primary pursuit of automotive proving ground. Accurately identifying test vehicles and applying the results to operation management are the basis for achieving this pursuit. Electronic vehicle identification technology can automatically identify and monitor vehicles in motion. Compared with video image capture identification, it has the advantages of quickness, accuracy, safety, reliability, and uniqueness. Furthermore, it’s also the application development direction of China's road traffic management system. According to actual management needs and experience, this paper studies the application of this technology in the operation management of the automotive proving ground. Through field verification, it is concluded that the electronic vehicle identification technology based on 5.8 GHz dedicated short range communications has certain application feasibility. Finally, based on the operation experience of automotive proving ground, this paper puts forward four specific application directions of electronic vehicle identification technology for reference of domestic automotive proving ground. References | Related Articles | Metrics

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Upgrading and Development of Vehicle Certificate of Conformance Platform in Commercial Vehicle Enterprises WANG Tian 2022, 47(20): 167-171.  DOI: 10.16638/j.cnki.1671-7988.2022.020.034 Abstract ( )   PDF (1206KB) ( )   According to the announcement on deepening the reform of automobile compulsory product certification (No.1 Announcement of Certification and Accreditation Administration of the P.R.C in 2017), a series of changes have taken place in the content and format of the vehicle conformity certificate. The vehicle conformance certificate platform of the company where the author is working has been upgraded and developed in view of this announcement and the shortcomings in workflow, coding rules and other aspects. Based on the whole development process, the author shows the upgrade process and implementation effect. By comparing the workflow, parameter extraction, data matching and other improvement effects before and after the platform upgrade, the author comes to the conclusion that it is necessary to integrate professional knowledge and computer knowledge to achieve a fast and efficient filing and printing of vehicle conformity certificate. The author looks forward to discussing the role of the intelligent office platform in the development of enterprises with the same industry to promote the consistency of vehicle certificate parameters and the optimization of related workflow. References | Related Articles | Metrics

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Research on PPM Quality Tool in the Stage of Product Design of Heavy Truck LI Chenglin 2022, 47(20): 172-176.  DOI: 10.16638/j.cnki.1671-7988.2022.020.035 Abstract ( )   PDF (1232KB) ( )   PPM is an important dimension of quality management index evaluation. By studying the PPM R&D and quality management model in the stage of the automotive product design, this paper promoted the implementation from the reliability design, accuracy of designing bill of material, improvement of high frequency fault after sale,etc. The evaluation results were fed back to the product design stage and process design stage in order to prevent risks. Through optimization and improvement, the product reliability was improved. The corresponding PPM index requirements were formulated. The development and design quality of parts suppliers were constrained. The first failure loss and failure frequency of products after sale were reduced. The efficiency of the vehicle development and customer satisfaction were improved. At the same time, a new idea of PPM quality tool in heavy truck R&D and quality control was put forward. References | Related Articles | Metrics

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Construction of Automobile Product Concept Based on Logical Procedure GAO Wenchao 2022, 47(20): 177-180.  DOI: 10.16638/j.cnki.1671-7988.2022.020.036 Abstract ( )   PDF (988KB) ( )   Automobile product concept construction is at the very beginning of product planning. It determines the overall commodity value and development orientation. To avoid practitioners from falling into the dilemma of making product concept subjectively, a method of deducing product concept based on logicality and quantification is put forward. By the exploration of customer demands behind market characteristics, the forecast of future market combined with current trends, and the review of sales performance of previous model under macro market, the future customer group structure and needs are deduced. On this basis, after target customer is fixed by quantitative structural analysis, USP and product concept assumption is constructed and verified by following market survey. On the whole, customer demand is instilled into product concept construction logically, which helps to build excellent product competitiveness. Meanwhile, the working procedure and referenced data are also specified for the convenience of practice. References | Related Articles | Metrics

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Design Practice of Manufacturing Execution System for Automobile Parts Factory Based on RFID Technology YAO Hao 2022, 47(20): 181-187.  DOI: 10.16638/j.cnki.1671-7988.2022.020.037 Abstract ( )   PDF (1179KB) ( )   Based on the current situation of the domestic automobile parts manufacturing industry and the domestic and foreign application of manufacturing execution system (MES),the actual needs of the enterprises were identified in view of the current problems such as the large degree of discrete production management in the automobile parts industry, the complex manufacturing process environment, the poor real-time data and the disadvantages of contact bar code identification technology. The contactless automatic identification technology realized by RFID using radio frequency communication was combined with the factory production operation management and real-time data management. As a research method that combining the MES to play the role of information and data bridge between manufacturing activities and management activities in the information system of the whole enterprise, the MES application scheme based on RFID technology was designed and constructed, and the development tools such as structured query language (SQL) database, Java and Lab view were used to successfully implement the application of the electronic power motor manufacturing line of Factory B. Through evaluation, such systems can effectively improve the efficiency of production and operation, and have the significance of promoting in the automobile parts manufacturing industry. References | Related Articles | Metrics

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Diagnosis and Troubleshooting of the Failure to Start the Magotan B8L Engine LIU Dan 2022, 47(20): 188-191.  DOI: 10.16638/j.cnki.1671-7988.2022.020.038 Abstract ( )   PDF (1452KB) ( )   In order to solve the failure problem of Magotan B8L car does not catch fire, through the analysis, combined with engine system control logic and the auxiliary test of car special equipment, the fault diagnosis and troubleshooting of two main issues about the starter not running and the starter running but the engine cannot start were completed finally. During analysis and diagnosis, the basic idea of engine system fault diagnosis and its control logic was demonstrated and it has certain reference value for teachers and students of vocational colleges and maintenance personnels. References | Related Articles | Metrics

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Comparative Fuel Supply System of in Cylinder Direct Injection Gasoline Engine and High Pressure Common Rail Diesel Engine WANG Maomei 2022, 47(20): 192-198.  DOI: 10.16638/j.cnki.1671-7988.2022.020.039 Abstract ( )   PDF (2299KB) ( )   Both in cylinder direct injection gasoline engine and high-pressure common rail diesel engine adopt in cylinder direct injection fuel technology. Due to the different properties of gasoline and diesel, the fuel injection systems of in cylinder direct injection gasoline engine and highpressure common rail diesel engine are different. This paper makes a comparative study of the two fuel systems from the two aspects of fuel system structure and fuel injection control, which can provide a reference for the research of gasoline engine in cylinder direct injection technology and diesel engine high-pressure common rail technology. References | Related Articles | Metrics