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30 May 2022, Volume 47 Issue 10 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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A Low Temperature Heating System Based on BEV Battery MA Chao 2022, 47(10): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2022.010.001 Abstract ( )   PDF (1246KB) ( )   Aiming at the problems in which the normal work of new energy vehicles at low temperature is affected, the dynamic characteristics of the battery of new energy vehicles is decreased, and the charging and discharging efficiency decreased, for the battery thermal management as a starting point, this paper designs a set of new auxiliary heating system, and through the real car bench and road tests verify the effectiveness of the proposed set of design. The test results showed that the average mileage of the vehicle has been effectively improved to 54.6% after the power battery is heated by the heating system, improved the new energy vehicles the problems of low efficiency in low temperature environment. It will provide an effective engineering reference for the efficient utilization of dynamic characteristics of new energy vehicle batteries and the development of technologies. References | Related Articles | Metrics

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Electric Vehicle Reliability Research LI Weizhen 2022, 47(10): 5-8.  DOI: 10.16638/j.cnki.1671-7988.2022.010.002 Abstract ( )   PDF (434KB) ( )   The promotion and popularization of electric vehicles has brought significant environmental benefits. At the same time, the research on its reliability is important. The concept of reliability and safety of electric vehicle components is considered to be an important issue. Generally speaking, the reliability evaluation of important electrical components of electric vehicle, the battery pack, power electronic converters and electric motor, plays an important role in the life performance of electric vehicle electrical system. This article reviews the basic problems and research methods of electric vehicle reliability research in recent years, summarizes the reliability research of electric vehicle components from different angles, and discusses the challenges and development prospects of electric vehicle reliability. References | Related Articles | Metrics

Intelligent Connected Vehicle

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The Development of the Driving Behavior Scoring Function of the Internet of Vehicles System YANG Shuaijie 2022, 47(10): 9-12.  DOI: 10.16638/j.cnki.1671-7988.2022.010.003 Abstract ( )   PDF (504KB) ( )   In order to facilitate drivers to understand their own driving behavior in a certain range, the article designed a set of algorithm process to realize the driving behavior scoring function of Eclipse, MySQL, the driving behavior scoring function of Hbase and Maven, and completed the development of the driving behavior scoring function. Through the scoring function, the abnormal driving behavior that affects the vehicle life can be reduced, and the durability of the vehicle operation and prolong the vehicle life can be improved. References | Related Articles | Metrics

Design and Research

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Bench Test Failure Analysis and Optimization of Aluminum Knuckle of an Electric Vehicle HAN Xiangxiu 2022, 47(10): 13-17.  DOI: 10.16638/j.cnki.1671-7988.2022.010.004 Abstract ( )   PDF (2741KB) ( )   Aiming at the failure of aluminum steering knuckle of an electric vehicle in bench test, failure analysis and research were carried out. Through the inspection of the failed parts and the analysis of the standard parts, the failure causes are determined. The reliability of the optimization scheme is verified by Computer Aided Engineering analysis, bench test and road test. The results show that after optimization, the maximum stress of the part is reduced by more than 30%, the fatigue life has been greatly improved. Due to the weak mechanical properties of aluminum alloy products relative to iron castings, stress concentration has a greater impact on the fatigue life of parts. When designing aluminum casting parts, the smooth transition of part surface structure shall be ensured. References | Related Articles | Metrics

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Comparative Analysis of the Chassis Performance of a Vehicle's Rear Suspension Structure ZHOU Wei 2022, 47(10): 18-23.  DOI: 10.16638/j.cnki.1671-7988.2022.010.005 Abstract ( )   PDF (1520KB) ( )   In order to reduce the complaints from customers, including small volume of luggage compartment, large pitch angle in straight braking, large roll angle in a bend, strong longitudinal impact and impact after-shake of rear axle, the chassis architecture was newly developed and the rear axle was upgraded from the strut type three link suspension to the integral multi-link suspension. A comprehensive comparison of these two suspensions was performed on the structural level, kinematics and compliance performance level and vehicle performance level. Study shows that the objective of reducing the above customer complaints is achieved on the vehicle level by optimizing the roll center height, anti-dive angle, wheel recession and longitudinal compliance in the new integral multi-link suspension. References | Related Articles | Metrics

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Analysis and Optimization of Muffler Condensed Water Freezing on a Certain Vehicle LIU Yu 2022, 47(10): 24-27.  DOI: 10.16638/j.cnki.1671-7988.2022.010.006 Abstract ( )   PDF (2232KB) ( )   Based on the fact that during the after-sale process of a certain vehicle, the vehicle could not start normally due to the freeze-up of the exhaust muffler in winter. In order to avoid such problems affecting user experience in subsequent vehicles, the faulty parts are disassembled, the cause of the problem was muffler freeze by check the fault parts, and the problem was repeated through the winter test to simulate the actual working conditions of the user. Through GT-POWER, the structure optimization was carried out for the muffler and the performance of the scheme was verified, meet the requirements of the vehicle and user service. It provides useful reference for solving the problem of muffler freeze-up, and also provides reference for muffler structure and noise design. References | Related Articles | Metrics

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Efficacy Verification and Application of Car Refreshing Fragrance JIA Yichao 2022, 47(10): 28-32.  DOI: 10.16638/j.cnki.1671-7988.2022.010.007 Abstract ( )   PDF (862KB) ( )   The fatigue driving is easy to lead traffic accidents, and results in injury to drivers and passengers. In order to solve frequent fatigue driving problems, the driver could reduce fatigue by smelling car refreshing fragrance. Fatigue condition of human body will scientificaly assess by EEG constantly monitored and multidimensional fatigue inventory, the refreshing effect of refreshing fragrance is verified from the subjective and objective aspects. The results show that the refreshing fragrance has good effect on reducing fatigue for a period of time, and increases driving safety. References | Related Articles | Metrics

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Strategy and Application for Passenger Car Mini Spare Tyre Detection Based on Wheel Speed Calculation ZHENG Yifang 2022, 47(10): 33-37.  DOI: 10.16638/j.cnki.1671-7988.2022.010.008 Abstract ( )   PDF (1094KB) ( )   Since automotive mini-spare tyre occupies little space and low-cost, it is well adopted by all kinds of passenger cars. However, mini-spare tyre differs from standard tyre in parameters like rolling radius and rim offset, which influence driving experience and safety when drivers are accelerating, braking and cornering. By calculating the wheel speed of the mini-spare tyre, setting wheel speed threshold for mini-spare recognition and building up mini-spare detection state machine, on-board control units such as vehicle control unit or electronic stability controller, is able to detect whether mini-spare tyre is mounted on the car after certain driving cycles. The designated controller sends the mini-spare recognition signal through CAN-bus so that relevant control units enter mini-spare mode, which is a drive mode designed for mini-spare use, including cautious driving indication, mini-spare performance optimized tuning parameters invocation to relevant control units,in order to minimize the driving risk with mini-spare tyre and improve drivers experience. References | Related Articles | Metrics

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Commercial Vehicle 5T Front Axle Structure Lightweight Design Method CHANG Yanchang 2022, 47(10): 38-43.  DOI: 10.16638/j.cnki.1671-7988.2022.010.009 Abstract ( )   PDF (1672KB) ( )   The design process and checking method of forging front axle are introduced. The UG NX software to establish the front bridge three-dimensional mathematical model, UG finite element analysis module for stress simulation analysis, get the parts of the stress, strain cloud map, on this basis for lightweight design, weight loss of 11 kg, and the finite element structure strength check, trial-produced samples for bench test and vehicle road test. The results show that, the lightweight design scheme of the front axle meets the requirements of strength, stiffness safety and fatigue life, and realizes the lightweight optimization design of the 5T front axle structure of commercial vehicles. Through this method, forward design and analogy analysis can be carried out quickly, which provides ideas and methods for lightweight design of forging front axle products. References | Related Articles | Metrics

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A Vehicle-mounted Foldable Camping House HU Jie 2022, 47(10): 44-49.  DOI: 10.16638/j.cnki.1671-7988.2022.010.010 Abstract ( )   PDF (5251KB) ( )   This paper presents a design scheme of vehicle mounted foldable camping house, which connects multiple folding units such as wall, floor, bed board and roof with each other by means of rotating pair and cylindrical sleeve ball joint, and drives the expansion and folding of each folding unit to exchange deformation through the driving device. When exchanging deformation, each folding unit changes along a single fixed path without interference point and dead point in the change process.It can be repeatedly and stably used in two states: unfolding and folding. When unfolding, it can form a large volume space surrounded by six sides . When folding, each folding unit can be closely attached into a bundle, and the small volume is convenient for vehicle movement, and its folding ratio can exceed 8.6 times. The supporting vehicle rack of the foldable room proposed in this paper can be used by various vehicle models, and the supporting small trailer and combined rack can easily form a field living camp.The folding trunk is combined into a trunk shell, which can easily transform an ordinary vehicle into a habitable self-propelled RV. References | Related Articles | Metrics

Testing and Experiment

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CAE Analysis and Verification of Effect of Weld Sequence on Vehicle Geometrical Variation CHENG Jidong 2022, 47(10): 50-55.  DOI: 10.16638/j.cnki.1671-7988.2022.010.011 Abstract ( )   PDF (1791KB) ( )   To study the effect of spot weld sequence on structural geometrical variation of body in white, fixtures of U-section joint and double-direction weld lap joint with adjustable assembly gap was designed. With the weld spot modeled by node-coupling method, the welding finite element model was established with Abaqus software. The weld process was established with clamping and welding step and spring-back step, and the structural geometrical variation under different welding sequences was analyzed. Compared with experimental results, the simulation model was proved to be robust, and be applied to the optimization of welding sequence of chain mounting surface and floor positioning hole structure of body in white. The results show that mechanical force and elastic strain are the main causes of weld-induced geometry variation. The built of finite element model supplied reliable way and basis for the optimization of body structure weld sequence. References | Related Articles | Metrics

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Method for Formulating Specifications for Vehicle Structural Durability Test Correlated to Customer ZHOU Dequan 2022, 47(10): 56-60.  DOI: 10.16638/j.cnki.1671-7988.2022.010.012 Abstract ( )   PDF (3172KB) ( )   Complete vehicle structural durability tests are the critical stage of vehicle R&D. The importance and general route for the customer-correlated vehicle structural durability test development are proposed. The detailed engineering practice process of customer correlation is introduced. The key methods of each link are expounded. Actual validating result show that this method can guarantee the precise force transfer of the customer-correlated vehicle structural durability test, improve test efficiency in the complete vehicle durability development. References | Related Articles | Metrics

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The Analysis of Problem of Onboard Refueling Vapor Recovery Fuel System after Refueling ZHANG Qidi 2022, 47(10): 61-65.  DOI: 10.16638/j.cnki.1671-7988.2022.010.013 Abstract ( )   PDF (1130KB) ( )   In order to solve the problem of gun after refueling oil and gas recovery system, this paper systematically expounds the differences of refueling ventilation between fuel systems on national six onboard refueling vapor recovery and national five. By comparing the working principles of different types of filling level venting valve and roll over valve, this paper studies the mechanism of problem during refueling after shutting off in national six fuel system, and analyzes the solution to the problem, which has guiding significance for the selection of roll over valve and the design of refueling system. References | Related Articles | Metrics

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Analysis and Optimization Example of Boom in Coasting Conditions HU Junsheng 2022, 47(10): 66-69.  DOI: 10.16638/j.cnki.1671-7988.2022.010.014 Abstract ( )   PDF (1446KB) ( )   In order to solve the problem of the boom of a vehicle in coasting conditions, this article uses the subjective evaluation method, through the vehicle noise test, noise transfer function test and component modal test, systematically analyzes the causes of the boom in coasting condition, and makes it clear that the boom in coasting condition is caused by the resonance of components on the transmission path. Finally, by optimizing the transmission path, the installation structure of the vehicle body is strengthened, the local mode is improved, and the connection form between the leaf spring and the rear drive axle is optimized to reduce the vibration transmission, so as to solve the sliding problem of roar condition. References | Related Articles | Metrics

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Simulation Optimization and Experiment on Intake Manifold of Gasoline Engine Based on AVL-FIRE LI Hongshuang 2022, 47(10): 70-74.  DOI: 10.16638/j.cnki.1671-7988.2022.010.015 Abstract ( )   PDF (1359KB) ( )   The flow and uniformity of intake manifold have important influence on engine power performance and economy. The intake manifold of a 1.5 T gasoline engine is researched by using AVL-FIRE analysis software. Then the structure of the intake manifold is optimized according to the analysis results. The improved intake manifold model is simulated and analyzed until the intake flow rate and intake uniformity of each branch of the intake manifold are improved and the evaluation index is satisfied. Finally, a sample is made according to the optimized intake manifold. The correctness of the simulation analysis is verified by experiments on a steady flow test bench. Through the combination of simulation analysis and test verification, the paper summarizes the optimization direction of the intake manifold, which effectively shorts the development cycle of the intake manifold. References | Related Articles | Metrics

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Application of Co-simulation to Mode Analysis of LGF/PP Tailgate of a Vehicle XU Dekui 2022, 47(10): 75-80.  DOI: 10.16638/j.cnki.1671-7988.2022.010.016 Abstract ( )   PDF (3259KB) ( )   In order to improve the simulation accuracy of mode analysis of composite tailgate with LGF/PP, a co-simulation method of Moldflow, Helius and Abaqus was adopted. Firstly, a material model of LGF/PP was built based on tensile test with different fiber orientation. Secondly, based on actual molding process, Moldflow is used to calculate the glass fiber distribution, which is mapped to the modal finite element model by Helius, then the final co-simulation model is obtained by combining with both the material constitutive model and mapped fiber orientation. Finally, the comparison was performed between simulation and physical test, and the error is within 6%. The results show that the mode value calculated by co-simulation model is closer to the mode of physical test, and this method can obviously improve the simulation accuracy, this provides important reference value and practical significance for the accurate prediction of modal performance of this kind of products and also can be applied to improve the simulation accuracy of mechanical behavior such as structural stiffness, strength, and thermo-mechanical coupling. References | Related Articles | Metrics

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The Design and Simulation of Wings External Flow Field of Racing Car Based on Fluent ZHANG Tingting 2022, 47(10): 81-87.  DOI: 10.16638/j.cnki.1671-7988.2022.010.017 Abstract ( )   PDF (8619KB) ( )   Aerodynamics simulation is very important in the design of wings external flow field of car racing. ProE software is used to establish the 3D model, and Fluent software is used to make the aerodynamics simulation analysis of the racing car. Aerodynamics package is designed and installed onto the car model. Then, the undated car model is used in the simulation of aerodynamics. The results show that, after the installation of pivotal forelimb and proximal limb, the value of lift becomes negative, the high speed and fast cornering performance has been promoted, driving experience has been improved. The installed pivotal forelimb is beneficial to the improvement of the air flow condition of the side tank and the heat dissipation performance of the water tank, the proximal limb can effectively reduce the turbulent kinetic energy and the eddy current resistance. References | Related Articles | Metrics

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Analysis and Improvement of Parking Control Handle Noise LIANG Weiya 2022, 47(10): 88-94.  DOI: 10.16638/j.cnki.1671-7988.2022.010.018 Abstract ( )   PDF (2830KB) ( )   With higher requirements for vehicle NVH, the NVH requirements for parking control handle are more and more strict. This paper expounds the noise types, generation principle, influence factors, optimization methods and cases of parking control handle. This paper mainly analyzes three kinds of common noises of parking control handle. For the tapping sound, the spring force of the button return spring is reduced from 11 N±1 N to 7 N±1 N by reducing the spring force of the button return spring. Increasing grease smear amount from 3 g to 6 g on both sides of pawl and gear plate, grease is imported grease, and knock sound is reduced from 58 dB to 55 dB. As for the unlocking noise, the unlocking noise was improved by wrapping rubber pad on the outside of the pawel limit structure. The iron touch of the pawel and the limit structure was changed to iron touch rubber. Through the verification of loading, the quality of the hard unlocking sound was significantly improved. As for drumming sound, the sound intensity and quality of drumming sound have been improved by wrapping bushing on the limit rivet, and the noise intensity has been reduced from 60 dB to 50 dB. After a series of measures, the noise of parking control handle has been greatly improved, and a good NVH effect has been obtained. References | Related Articles | Metrics

Process and Equipment

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Closed Die Forging Process of Aluminum Alloy 7050 Large Ring LI Zeyuan 2022, 47(10): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2022.010.019 Abstract ( )   PDF (1149KB) ( )   The large aluminum alloy 7050 ring is an important rotary body component in the aviation and aerospace fields. Aiming at the structural characteristics of large diameter, low height and thin ring wall in large aluminum alloy ring parts, this paper analyzes the rational hot die forming scheme for aluminum alloy 7050 large ring parts. According to the forging drawing of the large aluminum alloy ring part, the hot die forging process flow of the large aluminum alloy ring part is determined. The commercial simulation software DEFORM is used to simulate the forming process of hot die forging for large aluminum alloy ring parts. The influence of different die forging schemes of open die forging and closed die forging on forming results of large aluminum alloy ring parts was analyzed. The influence of initial billets in different sizes on forming effect of large aluminum alloy rings is researched, and the structure of the die is improved through comparative analysis, finally a more reasonable hot die forging forming scheme for large aluminum alloy ring parts is determined. It can be seen from this hot die forming scheme that the large aluminum alloy ring has a good forming effect, complete cavity filling, reasonable setting of the flash groove, and a maximum forming force of 9.6×108 N. References | Related Articles | Metrics

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The Application of Automobile Harness and Its Spatial Layout ZHANG Wanting 2022, 47(10): 100-102.  DOI: 10.16638/j.cnki.1671-7988.2022.010.020 Abstract ( )   PDF (783KB) ( )   Automobile harness is the energy and signal transmission channel for the safe operation of various automobile electronic and electrical equipment, which plays a vital role in the safe and reliable driving of automobile. This paper introduces the basic concept and relevant specific knowledge of automobile harness, briefly analyzes the relevant contents involved in the development technology of automobile harness, and focuses on some problems in the spatial layout of automobile harness, which can provide some reference and thinking for automobile harness practitioners. References | Related Articles | Metrics

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The Controlling Methods for Formaldehyde Emission of Parts Injected by Polyformaldehyde Material in Automotive Cabin ZHANG Liang 2022, 47(10): 103-107.  DOI: 10.16638/j.cnki.1671-7988.2022.010.021 Abstract ( )   PDF (1342KB) ( )   Polyformaldehyde material is polymerized from formaldehyde monomer, and always has high formaldehyde emission. Formaldehyde is easily released into the car along with the forming parts, leading to excessive formaldehyde in the car. Due to the small size, large quantity and scattered distribution of parts, it is difficult to solve such pollution problems of in-car air quality according to the traditional methods. Therefore, it is necessary to study scientific and reasonable controlling methods with low cost and operability for the formaldehyde emission. In this paper, the formaldehyde emission of injection samples of low volatile organic compounds, VOCs grade and common grade POM (polyformaldehyde) was studied. The result showed that whatever c-POM (copolymerized formaldehyde) or h-POM (homopolymerized formaldehyde), compared with common grade, low VOCs grade can greatly reduce the formaldehyde emission in the products. At the same time, the possible sources of the parts injected by formaldehyde materials were analyzed and discussed from different perspectives, and the corresponding controlling methods and optimization measures were given. References | Related Articles | Metrics

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Exploration of Project Management in the Process of New Vehicle Manufacturing Technology Development SONG Junwei 2022, 47(10): 108-112.  DOI: 10.16638/j.cnki.1671-7988.2022.010.022 Abstract ( )   PDF (1916KB) ( )   The rapid popularization of automobiles in China has led to the prosperity of automobile manufacturing process development, and how to apply the idea of project management to process development management in automobile manufacturing process development projects, it has always been the main problem that affects the smooth progress of automobile manufacturing process development projects. Taking automobile process development project as the main body and combining with project management theory, this paper discusses its practical application in the process of process development project from the main elements of project management. Through the node control, risk identification, personnel management and other measures, the final results guarantee process development on time and quality to be realized, to ensure smooth mass production projects. References | Related Articles | Metrics

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Research of "1+X" Certificate System in Higher Vocational New Energy Vehicle Major LIU Qinjian 2022, 47(10): 113-117.  DOI: 10.16638/j.cnki.1671-7988.2022.010.023 Abstract ( )   PDF (1035KB) ( )   With the comprehensive spread of the "1+X" certificate system, many colleges and universities have encountered many difficulties in the implementation of the "1+X" certificate system. In order to explore the path of implementing the "1+X" certificate system for new energy vehicle testing and maintenance majors in higher vocational colleges and solve existing problems, the article discusses the policy interpretation of colleges and universities, the social recognition of certificates, curriculum system settings, training equipment.In terms of the teaching team, the obstacles to the implementation of the "1+X" certificate system for the new energy vehicle inspection and maintenance majors in higher vocational colleges at the current stage are analyzed. Combined with the reality, the corresponding solutions are explored. It aims to improve the talent training system of new energy vehicle testing and maintenance major in higher vocational colleges, promote the improvement and development of higher vocational education, and improve the quality of talent training. References | Related Articles | Metrics

Automobile Education

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Teaching Reform and Practice of Automobile Insurance Major under a Workshop Mode MAO Yinghui 2022, 47(10): 118-121.  DOI: 10.16638/j.cnki.1671-7988.2022.010.024 Abstract ( )   PDF (1017KB) ( )   In order to respond to the call of college application-oriented teaching reform and meet the demand of insurance enterprises for skilled talents, the workshop teaching mode was introduced into the teaching reform of insurance major (automobile loss and assessment direction) in Changchun automobile industry institute, aims to cultivate applied innovative talents, actively expands the teaching reform path of higher vocational education, establishes the teaching mode of insurance workshop with insurance enterprises, and explores the practical methods in line with this major. Koch four-level assessment theory was adopted to accurately evaluate the implementation effect of workshop teaching mode in insurance major. The results show that the application of workshop teaching mode not only improves students' practical level, professional quality and innovation ability, but also effectively improves students' job matching degree. At the same time, in the process of teaching reform in the workshop, teachers' teaching thinking has been innovated and their teaching ability has been significantly improved, which also provides a new platform for school-enterprise cooperation and co-education. References | Related Articles | Metrics

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Practice Exploration of Teachers' Teaching Ability Competition to Promote the Reform of Three Education — Taking the Competition Entries of Accident Car as an Example SHU Hui 2022, 47(10): 122-125.  DOI: 10.16638/j.cnki.1671-7988.2022.010.025 Abstract ( )   PDF (1033KB) ( )   National competition for skills of vocational education teachers' teaching ability competition was sponsored by the Ministry of Education. Improved the teaching ability of teachers through the competition, and then promoted reform of vocational education. This paper takes the participating courses as an example to improve the teaching and skill level of teachers through theoretical learning and skill competition. Develop loose-leaf textbooks, school-enterprise textbooks based on enterprise job standards. According to different teaching contents, a variety of teaching methods are used to reflect the "efficient classroom" with students as the main body. The foundation of the reform is teacher reform, the carrier is textbook reform, and the core is teaching law reform.Through the transformation of the achievements of the competition, the reform of the three education in vocational colleges will be promoted efficiently and the quality of talent training in vocational education will be improved. References | Related Articles | Metrics

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The Application of QC Group Activities to Automotive Capstone Courses CHEN Xiaohu 2022, 47(10): 126-129.  DOI: 10.16638/j.cnki.1671-7988.2022.010.026 Abstract ( )   PDF (978KB) ( )   In order to improve the teaching quality of Capstone course of automobile major, this paper adopts the methods of literature research, investigation and comparative research to clarify the status and existing problems of the course implementation through the investigation and analysis of the students of automobile major of grade 18. On this basis, combined with the connotation and characteristics of the quality control group, expounds the connotation of Capstone course quality control group, and systematically puts forward the organization mode of Capstone course quality control group activities of automobile majors. Through the research and practice of the subject, the Capstone curriculum total quality control mode based on quality control group activities is established, and the continuous improvement mechanism of Capstone curriculum based on engineering education certification is formed, in order to provide reference for the construction of Capstone curriculum of engineering specialty in vocational colleges in China. References | Related Articles | Metrics

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The Application of Virtual Simulation Technology to the Practical Teaching of Automobile Electrical and Electronic Technology HONG Minghu 2022, 47(10): 130-133.  DOI: 10.16638/j.cnki.1671-7988.2022.010.027 Abstract ( )   PDF (1128KB) ( )   The course of electrical and electronic technology involves many concepts and abstract contents, which is difficult in the actual teaching process. Students do not have a solid grasp of basic knowledge, plus the limitations of experimental conditions. Under the lack of experimental support, students' interest in learning is further reduced and the learning difficulty of the course is increased. Multisim software has the function of virtual simulation circuit analysis and has been applied in practical engineering. By introducing the virtual simulation software into classroom teaching, it can greatly improve the efficiency of teaching and experiment, and deepen students' understanding and application of basic electrical knowledge. Combined with the teaching case of 555 timer in automobile turn signal circuit, from parameter theoretical analysis to fault phenomenon simulation,this paper enables students to deeply understand a series of theoretical and practical knowledge, such as circuit principle creation, electrical parameter analysis, virtual oscilloscope use and so on. From the perspective of teaching effect, the introduction of simulation experiment can effectively enhance students' learning interest and lay a solid foundation for better learning the maintenance knowledge of automobile electrical system. References | Related Articles | Metrics

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Ideological and Political Exploration for Intelligent Vehicle Professional Practice Courses ZHANG Jianheng 2022, 47(10): 134-137.  DOI: 10.16638/j.cnki.1671-7988.2022.010.028 Abstract ( )   PDF (980KB) ( )   Curriculum ideological and political teaching is an important content of higher education at present, and also an important link for schools to strengthen ideological and political education teaching of professional practice courses. Taking the intelligent car innovation practice course as an example, this paper analyzes the problems existing in the implementation process of ideological and political teaching of intelligent vehicle professional curriculum, and explores the way and content of ideological and political integration of intelligent vehicle professional practice curriculum teaching. With students as the main body, teachers as guidance, deep mining the curriculum ideological and political teaching elements, experimental content, teaching methods, and combined with the Internet teaching and project-driven teaching mode, built the intelligent vehicle professional practice course ideological and political teaching system, realize the curriculum ideological and political education goals and professional practice teaching goal is highly unified. After the implementation of teaching, it shows that the curriculum can realize the organic combination of ideological and political courses and professional knowledge, and promote the improvement of students' comprehensive quality. References | Related Articles | Metrics

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The Platform Construction of Application-oriented Undergraduate New Energy Vehicle Practical Teaching System HU Xuefang 2022, 47(10): 138-142.  DOI: 10.16638/j.cnki.1671-7988.2022.010.029 Abstract ( )   PDF (1052KB) ( )   In order to meet the needs of the development of modern automobiles from traditional automobiles to new energy vehicles, vehicle engineering majors in applied undergraduate colleges have opened courses in the direction of new energy automobile personnel training. The applied undergraduate vehicle engineering major needs to cultivate compound talents who meet the development needs of the new energy vehicle industry, and it is necessary to scientifically and rationally build a practical teaching system platform in the direction of new energy vehicles to improve the practice and innovation capabilities of new energy vehicle talents. The article mainly analyzes the importance and principles of the construction of the practical teaching system platform in the direction of new energy vehicles for applied undergraduate vehicle engineering, and puts forward the construction plan and implementation countermeasures of the practical teaching system platform in the direction of new energy vehicles, with a view to providing application-oriented undergraduate colleges and universities for vehicle engineering. The training of practical skills of professional talents in the direction of new energy vehicles provides a reference to meet the requirements of the rapid development of the new energy vehicle industry for the practice and innovation capabilities of new energy vehicle talents. References | Related Articles | Metrics

Standards Regulations Management

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Feasibility Analysis of the Application of Virtual Review Technology in the Development of Engineering Prototypes YAN Shijun 2022, 47(10): 143-148.  DOI: 10.16638/j.cnki.1671-7988.2022.010.030 Abstract ( )   PDF (1432KB) ( )   With the acceleration of new car iterations and the increasingly complex product configurations, traditional auto manufacturing companies relying on physical trial production to improve product quality can no longer meet market demand. This paper proposes to apply virtual review technology to the development of engineering prototypes, and to use the advantages of virtual review technology to comprehensively verify the performance of the whole vehicle and subsystems, so as to minimize the risk of problems before the physical vehicle is built. The article discusses from the introduction of virtual review technology for engineering prototypes, the environment support for virtual review of engineering prototypes, and the virtual review mechanism for engineering prototypes. Finally, the significance of this research method for enterprises to enhance product competitiveness is discussed. References | Related Articles | Metrics

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Enterprise Level BOM for Data Management ZHAO Yaping 2022, 47(10): 149-152.  DOI: 10.16638/j.cnki.1671-7988.2022.010.031 Abstract ( )   PDF (1112KB) ( )   Enterprise-level bills of materials is an effective way to control company-level data. Combined with the company's values, it ensures the integrity, accuracy and validity of product data, and at the same time achieves the purpose of saving the company's manpower and material resources, forming a data management method. The enterprise-level bill of materials is to look at the overall situation of product data, in the product development process, multi-product series planning, and the entire process of enterprise-level management changes, to ensure product configuration, bill of materials, product changes and other data highly integrated management methods. This data management and control method is only a model reference for enterprise data management, and strives to achieve an efficient accuracy and consistency of the entire product life cycle of the enterprise. References | Related Articles | Metrics

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Distribution Path Scheme of Urban Cold Chain Logistics Terminal Based on Genetic Simulated Annealing Algorithm —Take Xi’an as an Example HUANG Jinling 2022, 47(10): 153-157.  DOI: 10.16638/j.cnki.1671-7988.2022.010.032 Abstract ( )   PDF (1252KB) ( )   The scale of cold chain logistics market is large, but the corrosion rate of products is higher than that of developed countries due to the backward refrigeration equipment in the transportation process in China. In order to effectively improve the transportation quality of cold chain logistics and improve customer satisfaction, this paper analyzes the problem of terminal distribution path of urban cold chain logistics, combined with the current situation of terminal distribution of cold chain logistics, and considers the damage of fresh products based on the actual situation of urban roads (normal road conditions, congested road conditions), distribution time and other influencing factors, the cold chain end distribution models under two road conditions are constructed respectively. The fuzzy time window is used to describe customer satisfaction, and the objective function with the shortest distance, the lowest cost, the best timeliness and the highest customer satisfaction is established. Finally, taking the business scenario of the road section around the wild goose pagoda in Xi'an as an example, the terminal distribution of primary cold chain logistics is simulated, and the genetic simulated annealing algorithm is used to solve the models of normal road conditions and congested road conditions. The results show that the cost of congested road conditions is higher than normal road conditions under the same satisfaction, so enterprises need to reasonably optimize the route. At the same time, it is proved that this method can achieve the purpose of reducing cost and increasing efficiency. References | Related Articles | Metrics

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The Quality Management Method of Passenger Car of the Whole Life Cycle and Its Application LIU Hualin 2022, 47(10): 158-163.  DOI: 10.16638/j.cnki.1671-7988.2022.010.033 Abstract ( )   PDF (1375KB) ( )   The automobile industry is an important basic industry of a country, and it is also the fastest industry of technological innovation and industrial upgrading. China has become the first country in global automobile production and sales for many consecutive years. After nearly 30 years of development, China's independent automobile brands have also made great progress. With the pressure of joint ventures and imported automobiles, how Chinese independent brands improve their competitiveness and international influence is of strategic significance to our economic development. At present, the development level of domestic passenger car industry is not uniform, so we should change the pursuit of development speed in the past to the pursuit of quality, the pursuit of sales in the past to the pursuit of efficiency, the pursuit of ranking in the past to the pursuit of brand promotion to comprehensively improve the technical content, quality and brand value of products. Therefore, this paper takes the improvement of quality management as the research object and refers to the experience and practice of quality management in the industry to objectively expatiate the application of the whole life cycle quality management of passenger vehicles, which meets the market's demand for high quality and high efficiency in automobile product development and provides a reference and applicable method for the quality control of automobile products in China. References | Related Articles | Metrics

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Analysis on the Compilation and Common Problems of Enterprise Test Method Standards LIAO Rui 2022, 47(10): 164-168.  DOI: 10.16638/j.cnki.1671-7988.2022.010.034 Abstract ( )   PDF (1068KB) ( )   The enterprise test method standard is an important basis and technical basis for an enterprise to organize production. The level of the enterprise test method standard reflects the technical level of the enterprise to a certain extent. When formulating, in order to better carry out the test, the content of the enterprise test method standard should be accurate and complete, concise, clear, and rigorous in wording. The article discusses the writing methods and common problems of enterprise test method standards, discusses some common problems in the process of writing enterprise test method standards through examples, and provides corresponding solutions to various common problems for reference when compiling enterprise test method standards, in order to achieve the purpose of improving the standard quality of enterprise test methods. References | Related Articles | Metrics

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Analysis of the Difference between the 2020 and 2010 Versions of JT/T 782 DENG Guokai 2022, 47(10): 169-172.  DOI: 10.16638/j.cnki.1671-7988.2022.010.035 Abstract ( )   PDF (1198KB) ( )   Compared with the previous version of 2010, the 2020 version of JT/T 782 has great changes in standard name, scope of application and performance requirements. This paper mainly expounds the differences between the old and new versions regarding the terms and definitions, the scope of application, test flow, tire imbalance, steering performance test, braking performance test, tire burst simulation requirements and bench test of tire burst emergency safety device, so as to provide a reference for relevant personnel of standard models of road transport vehicle inspection. References | Related Articles | Metrics

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Hydrogen Storage Technology of Hydrogen Fuel Cell Vehicle and Its Development Status CUI Mingyue 2022, 47(10): 173-178.  DOI: 10.16638/j.cnki.1671-7988.2022.010.036 Abstract ( )   PDF (1382KB) ( )   In the hydrogen energy industry chain, hydrogen storage technology is an indispensable link in the development of hydrogen energy. Various hydrogen storage technologies have been applied to the vehicle hydrogen storage system. In this paper, the research status of hydrogen storage technology for hydrogen fuel cell vehicle is reviewed. The advantages and disadvantages of high-pressure gaseous hydrogen storage, low temperature liquid hydrogen storage, organic liquid hydrogen storage and metal hydride hydrogen storage are compared and analyzed. Physical hydrogen storage technology has the characteristics of high quality, low cost and simple operation. Chemical hydrogen storage technology not only has high hydrogen storage capacity but also improves the safety of hydrogen storage technology. In order to meet the requirements of hydrogen storage technology for hydrogen fuel cell vehicles, maintaining high energy density storage is the key of hydrogen storage technology while achieving cleaner, safer and low-cost standards. References | Related Articles | Metrics

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Lightweight Design Methods and Applications of Body ZHANG Na 2022, 47(10): 179-183.  DOI: 10.16638/j.cnki.1671-7988.2022.010.037 Abstract ( )   PDF (1151KB) ( )   The improvement of body lightweight level can not only reduce fuel consumption, but also improve driving range, which is of great benefit to fuel vehicles and new energy vehicles. This paper focuses on the discussion of body lightweight design methods, excavates the fundamental principles of body lightweight design, lists the calculation formulas of relevant methods, expounds in detail from three aspects of material, structure and technology, briefly describes its application status on solid bodies at home and abroad, and summarizes the lightweight design methods that can realize local strengthening, reduce overall weight, and have good performance. References | Related Articles | Metrics

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Research Progress of Polypropylene in Automobile Interior and Exterior Decoration SHAO Lingzhi 2022, 47(10): 184-187.  DOI: 10.16638/j.cnki.1671-7988.2022.010.038 Abstract ( )   PDF (1044KB) ( )   This paper introduces the application status of polypropylene in automobile interior and exterior decoration, and discusses the development process and latest research progress of automobile interior decoration materials in odor and exterior decoration materials. Polypropylene materials for automobile interior decoration are mainly discussed from the source of odor, odor control methods, including the selection of substrate, minerals, additives and processing technology. When selecting materials for automobile exterior decoration, it is necessary to consider the requirements of dimensional stability, high strength, high rigidity and high impact resistance. Polypropylene-LGF materials and "three high" polypropylene composites are mainly used. References | Related Articles | Metrics

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Antibacterial Materials for Vehicles HE Jiazhi 2022, 47(10): 188-192.  DOI: 10.16638/j.cnki.1671-7988.2022.010.039 Abstract ( )   PDF (1264KB) ( )   With the increasing improvement of people's living standards, customers pay more attention to safety and health in the car. The key to the development of antibacterial materials for vehicles is the choice of appropriate antibacterial materials, test methods and criteria for automobile interior decoration parts. This article introduces the mechanism and detection methods of antibacterial materials, and comprehensive understand the current situation according to the thorough test. Results show that the addition of antibacterial agent in raw materials plays a decisives of plastics, but it has little effect on fabric. In addition, reasons for the rising cost and the application prospect of antibacterial materials for vehicle is introduced in this article. References | Related Articles | Metrics

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The Coaxial Transmission Theory of Image Products YUAN Shoujuan 2022, 47(10): 193-203.  DOI: 10.16638/j.cnki.1671-7988.2022.010.040 Abstract ( )   PDF (4255KB) ( )   Taking Maxim's coaxial transmission chip GMSL protocol as an example, the coaxial transmission theory of vehicle products is analyzed, the self-developed camera and vehicle central control host samples are debugged and verified, and experimental data are formed. The coaxial transmission compliance design conditions, technical recommendations, channel simulation, PCB and wiring harness loss recommendations, crosstalk specifications, schematic and PCB LAYOUT design recommendations, eye diagram testing, POC circuit design and verification process for imaging products are described, and the same axle cable transmission is a relatively stable and high-quality transmission solution for high-definition digital cameras in the automotive industry at present, soft and hard technology has advanced. It has promoted its in-depth application in the fields of human-computer interaction, unmanned driving, AR, and intelligent robots. References | Related Articles | Metrics

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Application of Lattice Boltzmann Method to Fuel Cell Two-phase Flow WANG Xi 2022, 47(10): 204-207.  DOI: 10.16638/j.cnki.1671-7988.2022.010.041 Abstract ( )   PDF (1663KB) ( )   Fuel cell has the advantages of high efficiency and environmental friendliness. It is a new energy which can replace the traditional energy. The macroscopic dynamic behavior of two-phase flow is often accompanied by physical processes such as phase transition, interface generation, combined motion, etc. For such a complex fluid system, traditional fluid mechanics models and simulation methods are faced with great difficulties. The lattice Boltzmann method of mesoscopic scale is introduced in this paper, two-phase flow model and its progress are described, and the application of lattice Boltzmann method to two-phase flow is discussed. The results show that lattice Boltzmann method is an effective means to study the two-phase flow, which can dynamically analyze and simulate the two-phase flow in real time, and obtain clear information about the two-phase interface. These studies provide a powerful analytical means and theoretical basis for more complex multiphase flow. References | Related Articles | Metrics