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25 December 2024, Volume 49 Issue 24 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management
Reviews


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New Energy Vehicle

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Research Progress of Health State Estimation Methods for Lithium-ion Batteries of Electric Vehicles PAN Zhengjun 2024, 49(24): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2024.024.001 Abstract ( )   PDF (473KB) ( )   As a power source for electric vehicles, lithium-ion batteries are developing rapidly. State of health (SOH) estimation plays an important role in ensuring the safe operation of battery systems. Based on the literature review of SOH estimation methods for lithium-ion batteries at home and abroad in recent years, this paper systematically discusses the theories and latest methods related to SOH estimation for lithium-ion batteries from the perspectives of experiment, model driven, data driven and hybrid methods, classifies and elaborates the existing estimation methods, compares and analyzes their performance and advantages. References | Related Articles | Metrics

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Optimal Structure Design and Simulation of Hybrid Excitation Motor Stator and Rotor for Electric Vehicle CHEN Yu, FANG Yimao, YANG Hangxu, XU Deyong 2024, 49(24): 7-10.  DOI: 10.16638/j.cnki.1671-7988.2024.024.002 Abstract ( )   PDF (1002KB) ( )   With the rapid development of the electric vehicle (EV) industry, there is an increasing demand for efficient and high-performance motors. This paper aims to improve the efficiency and power performance of hybrid excitation motors by optimizing the stator and rotor structures to meet the requirements of new energy electric vehicles and tricycles. The study used the Maxwell simulation module to optimize the speed, electromagnetic force, and structural parameters. By conducting parametric research on the stator slot type, rotor structure parameters, and overall technical route layout, the motor performance is significantly improved. Combining existing design experience for the motor stator, the design of the motor stator is carried out, and the slot structure is continuously optimized to reduce the steady-state torque and cogging torque. This study not only provides an efficient and stable motor solution for new energy electric vehicles and tricycles but also has significant implications for promoting innovation and development in electric vehicle motor technology. By optimizing the design, the energy consumption of electric vehicles can be reduced, the range can be increased, and the environmental impact can be reduced, which meets the current demand for green and efficient transportation tools. References | Related Articles | Metrics

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Study on Dual LCL-S Compensation Topology of Electric Vehicle Wireless Charging System LIU Jie, SONG Anran, CHEN Ying 2024, 49(24): 11-14.  DOI: 10.16638/j.cnki.1671-7988.2024.024.003 Abstract ( )   PDF (1285KB) ( )   In the research of the radio energy transmission system of electric vehicles, aiming at the problem of the harmonic after the high-frequency inverter, a compensation method is proposed based on LCL-S. This article analyzes the constant-current characteristics of LCL compensation network and a resistive input impedance after compensation. The power factor of the system is improved and transmission characteristic of the system are more stable and efficient. Maxwell, MATLAB and Simplorer are used to carry out joint dynamic simulation and verification of the topology selection of compensation link. The simulation results show that the simulation waveform after LCL-S compensation is more stable. The results show that the transmission characteristics of electric vehicle wireless charging system under LCL-S compensation topology are good. References | Related Articles | Metrics

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Analysis of the Active Heating Technology in Electric Drive System ZHANG Songlin, YU Hao, ZHAO Xiaokun, CHEN Guanglin, WANG Fuwen 2024, 49(24): 15-18.  DOI: 10.16638/j.cnki.1671-7988.2024.024.004 Abstract ( )   PDF (798KB) ( )   With the rapid development of the new energy automobile industry, the competition is intensifying, and the requirements of car companies are getting higher and higher in terms of weight reduction and cost reduction and technological innovation. The energy utilization rate and integration of thermal management system have become one of the core elements of product competitiveness, and the heat energy utilization of electric drive assembly has become an important topic of industry research. Through the test of active heating technology of electric drive assembly on the vehicle, the influencing factors, performance and application difficulties of active heating are analyzed, and how to improve the performance and energy utilization rate of active heating and enhance the application feasibility of this technology are discussed. To achieve a high degree of integration of thermal management system, reduce vehicle weight and cost, improve the low temperature adaptability of electric vehicles, and enhance user experience. It has practical guiding significance, and also provides reference experience for the development of active heating technology of electric drive assembly. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on Key Measures to Improve the Success Rate of Remote Vehicle Control CHEN Li, WEI Runru, LU Tiao, ZHENG Qi 2024, 49(24): 19-24,34.  DOI: 10.16638/j.cnki.1671-7988.2024.024.005 Abstract ( )   PDF (1236KB) ( )   With the rapid development of vehicle networking technology, remote vehicle control technology plays a key role in improving vehicle intelligence and convenience. However, market feedback shows that abnormal remote vehicle control functions have become the focus of user complaints. To this end, the paper analyzes the technical characteristics and challenges of remote vehicle control system, and proposes a series of improvement measures, including simplifying the pre-conditions for remote vehicle control, ensuring the continuous power supply of telematics box (T-BOX), improving the cloud connection strategy, and adjusting the reading time of the control area network (CAN) signal. These measures are designed to solve the problem of remote vehicle control execution failure, in order to enhance the reliability of vehicle networking technology and improve the user experience. References | Related Articles | Metrics

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Fine-grained Vehicle Recognition Based on Multi-scale Fusion Attention Mechanism SHANG Yabo, JIA Deshun, QU Yating 2024, 49(24): 25-29.  DOI: 10.16638/j.cnki.1671-7988.2024.024.006 Abstract ( )   PDF (895KB) ( )   In order to solve the problem of large intra-class differences and high inter-class similarity in fine-grained image classification tasks, this paper proposes a multi-scale feature fusion network, which aims to learn and refine more discriminant features from the potentially different features. Among them, the feature pyramid is used as the benchmark network to obtain the difference level semantic features, and the multi-level information can provide a more comprehensive decisionmaking basis for fine-grained image classification tasks. The attention mechanism combines spatial information and channel information to enrich the convolution features. Experimental verification shows that compared with other advanced models, the proposed method effectively improves the classification accuracy, and the recognition accuracy of the vehicle dataset is 93.5%. References | Related Articles | Metrics

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Application of CANoe Based in Vehicle Ethernet Gateway Routing Testing Technology SONG Xiaoxiao 2024, 49(24): 30-34.  DOI: 10.16638/j.cnki.1671-7988.2024.024.007 Abstract ( )   PDF (1377KB) ( )   The gateway controller, as the central hub of the in-car communication network, is an important component of the safe and reliable transmission and processing of data in automobiles between different network types in vehicles controller area network (CAN), CAN with flexible datarate (CANFD) and Ethernet. The consistency testing of routing plays an indispensable verification role for gateways in protocol conversion, data routing, diagnostic routing, and other aspects. The article introduces the method of using CANoe software to directly read the Excel routing table for gateway routing consistency testing and the implementation of simulating in vehicle Ethernet link partners, ensuring the simplicity, accuracy and scalability of the testing. It plays a certain role in promoting the expansion of subsequent testing outlines and methods. References | Related Articles | Metrics

Design and Research

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Kinematics Optimization of Double Cross Arm front Suspension for Electric Racing Cars Based on ADAMS/Car HUANG Changhai, GUO Yang* , JIANG Yanjie, YANG Hao, LIU Fajun, ZHAN Huizhen 2024, 49(24): 35-39.  DOI: 10.16638/j.cnki.1671-7988.2024.024.008 Abstract ( )   PDF (1319KB) ( )   The unequal length independent double crossarm suspension has excellent handling stability, but the structure is complex and the cost is high, and it has a broad market in high-end cars and racing cars. This paper aims to optimize the design of the front suspension of the electric racing car by using ADAMS simulation software. By building an independent front suspension model with unequal length and double cross arms, the relevant parameters are checked and the simulation analysis is carried out, and the changing trend of the positioning parameters is deeply studied. Based on the analysis results, the front suspension design is successfully optimized and the handling stability of the car is improved. This research not only provides a theoretical basis for the optimization of the front suspension of the racing car, but also brings technological innovation to the high-end automobile and racing market, and shows the feasibility and effectiveness of the optimization design. References | Related Articles | Metrics

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Research on Cost Reduction Strategy of Automobile Assembly Based on Design Optimization GUO Chengyong, XU Baoqiang 2024, 49(24): 40-42,47.  DOI: 10.16638/j.cnki.1671-7988.2024.024.009 Abstract ( )   PDF (1014KB) ( )   This article investigates the impact of automotive product design on the manufacturing cost of automobile assembly, identifies the key factors that affect assembly cost at the design end, and analyzes and studies five major aspects through case comparison methods: integrated design, convenient installation structure design, reduction of installation points, optimization of fasteners, and optimization of adjustment structures. A set of methods for controlling assembly costs from the product design end is obtained. The research shows that product design has a decisive impact on the efficiency improvement and cost reduction of the subsequent assembly process. This study not only provides practical manufacturing cost reduction solutions for automobile manufacturers, but also provides new ideas for cost management and cost optimization of the entire industry References | Related Articles | Metrics

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Research on the Fatigue of Transmission Bearing Seats Based on Roller Dynamic Excitation YIN Jinju, WEN Xinhai, ZHANG Lei 2024, 49(24): 43-47.  DOI: 10.16638/j.cnki.1671-7988.2024.024.010 Abstract ( )   PDF (2607KB) ( )   In evaluating the fatigue life of bearing seats using traditional static analysis methods, the influence of dynamic excitation from rollers on them is often overlooked. To overcome this limitation, based on bearing seats of a dual clutch transmission (DCT), this paper proposes an prediction innovative method of fatigue life analysis based on roller dynamic excitation. By establishing a full model of the transmission, and according to divide from the middle of the adjacent rollers arc length into four sub-models, combining the surplus and the actual loads at the working temperature, each sub-model's stress under working load is analyzed. The experimental load spectrum is converted into a fatigue load spectrum representing the excitation of the roller on the bearing seats. The fatigue damage of the bearing seats caused by a single cycle is analyzed, and the cumulative dynamic fatigue damage of the bearing seats is calculated. The research shows that this analysis method not only accurately predicts the fatigue life of the bearing seats in the transmission, but also provides strong technical support for the design optimization and reliability assessment of related components, which is of great significance for improving the performance and reliability of the transmission. References | Related Articles | Metrics

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Failure Analysis and Improvement of Sun Gear in Wheel-side Reducer LI Guiqiang, ZHU Liang, CHENG Jinlin, YUAN Qiwang, YAN Shufa 2024, 49(24): 48-51.  DOI: 10.16638/j.cnki.1671-7988.2024.024.011 Abstract ( )   PDF (2254KB) ( )   In order to solve the failure problem of the sun gear of wheel-side reducer in the drive axle assembly gear fatigue bench test, the comprehensive analysis of macro profile, chemical composition, metallographic structure, hardness and hardened depth of the failure sun gear is carried out. This paper supposes the failure cause of the sun gear is the unbalance load. The finite element analysis of the drive axle assembly based on MASTA shows that the safety factor of gear contact fatigue is less than 1 and the contact between the sun gear and the planet gear is unbalanced. Therefore, it is inferred the failure cause of the sun gear is the unbalance load of gear causes excessive local stress on tooth surface. In order to improve the failure cause of the sun gear, the tooth width of the sun gear is increased by 10 mm and the gear shape is modified. The failure problem is solved. This study provides a basis for the failure analysis and improvement of sun gear. References | Related Articles | Metrics

Testing and Experiment

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Experimental Study on Effect of N-butane on Combustion of Natural Gas Engine ZHOU Lei 2024, 49(24): 52-56.  DOI: 10.16638/j.cnki.1671-7988.2024.024.012 Abstract ( )   PDF (1279KB) ( )   As energy shortages and environmental pollution problem become increasingly serious, natural gas, as an relatively ideal alternative energy, has received more and more attention. Conventional natural gas usually contains a small amount of butane, which affects the combustion characteristics of natural gas combustion. Based on the bench test of natural gas engine, this paper analyzes the changing laws of related combustion parameters through bench test data, and summarizes the influence of n-butane content on natural gas engine combustion. Studies show that for lean-burn spark-ignition natural gas engine, as the n-butane content in natural gas increases, the instantaneous heat release rate, maximum explosion pressure, and maximum pressure rise rate all increase; the 0～10% combustion duration remains unchanged, and the 10%～90% combustion duration is shortened. The combustion influence laws summarizes in this paper can guide the performance optimization direction of natural gas engine, thereby shortening development time and improving engine performance. References | Related Articles | Metrics

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Acceleration Method for Components and Parts Road Simulation Tests Based on Pseudo Damage Reserving ZHONG Zhihong, LIU Xin 2024, 49(24): 57-60.  DOI: 10.16638/j.cnki.1671-7988.2024.024.013 Abstract ( )   PDF (1594KB) ( )   To solve the problem that using proving ground signals directly in components and parts road simulation tests takes too much time, a spectrum acceleration editing method based on pseudo damage is proposed. In practice good acceleration effect is achieved while retaining 100% pseudo damage, and comparative analyses are conducted between the original spectrum and the accelerated spectrum from three perspectives: time-domain statistical characteristics, amplitude cumulative frequency, and power spectral density. The results show that the fatigue damage characteristics of the spectrum can be well preserved. The bench durability test shows that the failure location and failure mode of the spectrum after accelerated editing are consistent with that of the original spectrum, the number of cycles is close, and the test time is significantly shorten, which verifies the rationality and effectiveness of the method. References | Related Articles | Metrics

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Simulation Study on the Influence of Dual Spark Plug Position on Engine Performance TIAN Yi, ZHEN Xudong, GENG Jie, LIU Daming, LI Jiabao 2024, 49(24): 61-65,82.  DOI: 10.16638/j.cnki.1671-7988.2024.024.014 Abstract ( )   PDF (1896KB) ( )   Based on 3D computational fluid dynamics (CFD) simulation platform, a single cylinder model of n-butanol dual spark plug engine is established. Based on the kinetic mechanism of chemical reaction of n-butanol, three sets of different dual spark plug arrangement schemes are set up by numerical simulation to analyze the effects of dual spark plug arrangement on combustion and emission performance of engine. The research results show that neither too long nor too short distance between two spark plugs can make the engine obtain good power performance. A=0.50 scheme can obtain the highest peak value of cylinder temperature and cylinder pressure, and the highest heat release rate, the highest cumulative heat release in the early stage of combustion, and the best engine power performance at this time. Higher cylinder temperature results in the highest NOX emission and the lowest SOOT emission when A=0.50. Combined HC and CO emission results, A=0.25 have the worst emission performance, while A=0.50 and A=0.75 have comparable HC and CO emission effects. References | Related Articles | Metrics

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Development of Automotive Brake-by-wire Products Based on AUTOSAR Software Architecture DONG Zuomin, WANG Yu, WANG Zhijian 2024, 49(24): 66-71.  DOI: 10.16638/j.cnki.1671-7988.2024.024.015 Abstract ( )   PDF (1120KB) ( )   With the rapid advancement of electrification and intelligence, steer-by-wire technology is gradually becoming a significant development direction in the automotive industry. Especially driven by the demands for intelligent driving control, brake-by-wire systems have also undergone technological innovations. This paper introduces the current status of brake-by-wire systems and focuses on the company of Globo integrated brake control (GIBC) system, detailing its hardware and software architecture. It particularly explores the development process of brake-by-wire systems based on the classic platform (CP) architecture of automotive open system architecture (AUTOSAR) is discussed, highlighting how the standardization and modularity of AUTOSAR improve development efficiency and system compatibility. The results indicate that the brake-by-wire system based on the AUTOSAR not only meet the high real-time and control precision requirements of intelligent driving but also offer excellent system integration and reliability, providing important references and guidance for the development of braking systems in future intelligent vehicles. References | Related Articles | Metrics

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Safety Performance Analysis of Pedestrain Protection Head Collision LI Mengxia, SHANGGUAN Zhengwei, HUANG Pengchong, XUE Xiaole, ZHU Jinyao 2024, 49(24): 72-77.  DOI: 10.16638/j.cnki.1671-7988.2024.024.016 Abstract ( )   PDF (1582KB) ( )   This article is based on the head collision injury of pedestrians in traffic accidents, combined with the evaluation system of the 2024 version of China-new car assessment program (C-NCAP) the regional division, scoring method and impactor calibration of children's head shape and adult head shape are analyzed in detail. Through the theoretical calculation of the head shape injury value HIC15, the experience accumulation of the acceleration curve injury value of the crash test. The size range of the head space check is proposed. And the key factors affecting the improvement of the safety performance of head collision are optimized and analyzed, which has guiding significance for improving the safety performance of pedestrian head protection in the early stage of subsequent model design. References | Related Articles | Metrics

Process·Materials

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Application of Intelligent Detection System Technology for Paint Surface Appearance Defects CHENG Xiaoxue, ZHANG Yalei* , BI Jing, TIAN Haiyang, WANG Hongyuan 2024, 49(24): 78-82.  DOI: 10.16638/j.cnki.1671-7988.2024.024.017 Abstract ( )   PDF (2201KB) ( )   Tunnel type system offer the advantages of continuous conveyance and lower equipment investment, while robotic type system offer better defect detection capabilities, 3D positioning, multi-vehicle compatibility, and room for upgrades. This paper discusses the detection technology of paint surface appearance defects in the process of automobile painting, and focuses on the comparison of two intelligent detection system, tunnel type and robotic type, and introduces in detail the application of robotic type intelligent detection system, including system principle, station layout, equipment configuration and data analysis. The study is to make technical reserves for the later upgrade of the production line equipped with automatic marking and automatic grinding and polishing systems, so as to further realize the full automation of paint appearance defect detection, grinding and polishing, and continuously improve the intelligent manufacturing capability and quality automation control ability. References | Related Articles | Metrics

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The Research and Application of Tool Automatic Selection and Auxiliary Space Check in Synchronous Engineering XU Qian, ZHU Baofeng, ZHU Wenyuan, MA Beifang 2024, 49(24): 83-88.  DOI: 10.16638/j.cnki.1671-7988.2024.024.018 Abstract ( )   PDF (1989KB) ( )   Tool selection is an important part of vehicle process development and synchronous engineering development. Conventional tools are selected manually, tool data is loaded and checked, and the overall operation frequency is high and the efficiency is low, which requires a lot of manpower and time. This paper introduces how to combine the rules of tool selection and the basic principles of space check, and automatically carry out the auxiliary space check of tool selection in the process of vehicle process development, and analyzes the structure, logic, database construction and two forms of common product structure and factory process check. The realization of automatic tool selection and space check avoids the problem of tool missing analysis, reduces product changes, and automatically generates vehicle tool list, which greatly improves efficiency and saves project cost and personnel input, and has promotion significance. References | Related Articles | Metrics

Automobile Education

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Exploration of Ideological and Political Education in the Course of Automotive Chassis Electronic Control Technology SHEN Yuanxing 2024, 49(24): 89-93.  DOI: 10.16638/j.cnki.1671-7988.2024.024.019 Abstract ( )   PDF (1207KB) ( )   Course ideological and political education is the focus of current curriculum reform, and it is also a major measure to clarify "what kind of people to cultivate, how to cultivate them, and for whom to cultivate them". This article explores the ideological and political aspects of the course Automotive Chassis Electronic Control Technology. Firstly, it clarifies the characteristics of the course and accurately grasps its objectives; next, reconstructs the teaching content and refine the key points of ideological and political education through project-based teaching; finally, creates a three-dimensional curriculum evaluation system to comprehensively evaluate the level of students' ideological and political understanding. The practical results show that integrating the curriculum ideological and political evaluation system into project-based teaching significantly improves the enthusiasm of students, makes classroom problem discussions and practical activities more proactive, and improves professional skills to a certain extent. At the same time, it also deepens students' understanding of professional ethics and social responsibility, and plays a certain promoting role in improving their comprehensive literacy. This progressive and in-depth exploration method has more effectively played the role of ideological and political education in the course of Automotive Chassis Electronic Control Technology. References | Related Articles | Metrics

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Research on the Integration Path of Ideological and Political Elements in Higher Vocational Automotive Professional Courses －Taking the Course of Introduction to Intelligent Connected Vehicles as an Example HUANG Xiaopeng1 , DAI Xinlei1 , LIN Hongliang2 2024, 49(24): 94-98,105.  DOI: 10.16638/j.cnki.1671-7988.2024.024.020 Abstract ( )   PDF (994KB) ( )   The aim of ideological and political education of specialized courses is to integrate value molding into the process of ability training and knowledge imparting organically. And the difficulty lies in the excavation and integration of ideological and political elements. Based on the practical integration of ideological and political elements in higher vocational engineering courses, this paper analyzes the problems in the current integration of ideological and political elements in professional courses and the reasons for these problems. Taking the teaching practice of the course Introduction to Intelligent Connected Vehicles as an example, suggestions are put forward for the integration path of ideological and political elements in automotive professional courses from the aspects of course teaching objectives, teaching design, teaching methods, teaching organization form, assessment and evaluation, and textbook construction. References | Related Articles | Metrics

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Design of on Virtual and Real Integration Experimental Teaching Platform of Intelligent Driving Function Test and Evaluation LU Dike, HE Haiyan* , ZHANG Lin, ZHANG Xinao 2024, 49(24): 99-105.  DOI: 10.16638/j.cnki.1671-7988.2024.024.021 Abstract ( )   PDF (1468KB) ( )   The test and evaluation of intelligent driving functions is a key link in its forward development. A teaching platform that integrates virtual simulation and closed field testing has been designed for the establishment and engineering implementation of testing and evaluation teaching methods for intelligent driving functions. This platform can be used for testing various types of intelligent driving functions at L2－L5 levels. Taking the safety and comfort of adaptive cruise control (ACC) function as the research object, three types of testing scenarios are designed: stationary front vehicle, automatic deceleration, and automatic acceleration, and are tested in a virtual simulation system and enclosed area. Through the design, implementation and analysis of ACC virtual and real teaching experiments, students have deepened their understanding of the basic knowledge of professional courses and improved their ability to solve practical engineering problems. In addition, explore an integrated experimental teaching system that covers theoretical knowledge, problem analysis, knowledge exploration, and engineering thinking that can be applied to the evaluation of other intelligent driving functions. References | Related Articles | Metrics

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Exploration of Ideological and Political Education in the Course of Automotive Testing and Diagnostic Technology XIE Jiayin, LIU Shuwei, GAO Weijiang, ZHANG Zhongyang 2024, 49(24): 106-109.  DOI: 10.16638/j.cnki.1671-7988.2024.024.022 Abstract ( )   PDF (1178KB) ( )   The rapid development of the automotive industry has put forward new requirements for talent cultivation in the industry. Only by integrating moral education and intellectual education can we cultivate professional talents with strong ideological and political literacy. This article takes the course of Automotive Testing and Diagnostic Technology as an example to explore the ideological and political construction ideas of the course. It explores the ideological and political points of the course from four aspects: industry development, technology application, professional hotspots, and practical training. At the same time, ideological and political elements are integrated into the entire process of teaching implementation and teaching evaluation. While cultivating students' professional abilities, it enhances their comprehensive quality and implements the concept of moral education. References | Related Articles | Metrics

Standards·Regulations·Management

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Research on Road Risk Assessment Method Based on Traffic Accident Data LIU Junqi, MA Long 2024, 49(24): 110-113.  DOI: 10.16638/j.cnki.1671-7988.2024.024.023 Abstract ( )   PDF (1075KB) ( )   In order to assist the public security traffic management department in assessing and managing road risk hazards, considering the characteristics of the commonly used "six-in-one" data, a road risk assessment method based on traffic accident data is proposed. Firstly, through mathematical derivation, it is concluded that a Poisson distribution model can be used to study the number of traffic accidents that occur on a certain road within a set unit time. Then, based on the Poisson distribution model, a method for assessing road risk is proposed. Finally, based on the road traffic accident data in Xi'an from 2020 to 2021, this method was practically applied. The results show that the assessment results obtained using this method are basically consistent with the actual situation. This method has certain reference value for the public security traffic management department to control road risks and manage potential safety hazards in a timely manner. References | Related Articles | Metrics

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Body Manufacturing Dimension Digital Close Loop Management Method Based on Precision Exterior Concept XU Wenhuan, WEI Ling 2024, 49(24): 114-117.  DOI: 10.16638/j.cnki.1671-7988.2024.024.024 Abstract ( )   PDF (4883KB) ( )   The body dimensional precision level is an important index of manufacturing ability for OEMs. The improvement of dimensional precision of body not only requires advanced highprecision manufacturing technology and digital dimension control system, but also needs a matching dimension quality management system. Based on the concept of Mercedes-Benz precise exterior, this paper briefly introduces the target and intelligent manufacturing technology for body dimension control, and then expounds the dimension digital closed-loop management method of the whole process of body manufacturing. Verified by mass production, the method gives full play to the advantages of intelligent equipment and digital system in dimension control, and significantly improves product dimension quality and manufacturing efficiency. References | Related Articles | Metrics

Reviews

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Current Status and Trends in Energy Management Strategies for Hybrid Electric Vehicles SUN Haoqing, WANG Jialin, WU Jiquan 2024, 49(24): 118-121.  DOI: 10.16638/j.cnki.1671-7988.2024.024.025 Abstract ( )   PDF (941KB) ( )   In the context of energy crisis and environmental pollution, countries all over the world are looking for ways to save energy and reduce emissions. The hybrid electric vehicle is favored for its advantages of environmental protection and energy saving, but the reasonable distribution of energy is a challenge that cannot be ignored for the multi-power source power system. Therefore, this paper reviews the current research progress of energy management strategies for hybrid electric vehicles, evaluates the advantages and disadvantages of various energy management strategies from the perspectives of calculation cost and optimality, and finally predicts the future development trend of energy management strategies for hybrid electric vehicles. References | Related Articles | Metrics

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Review of Vehicle Life Cycle Assessment Methods and Research Progress YANG Yi 2024, 49(24): 122-128.  DOI: 10.16638/j.cnki.1671-7988.2024.024.026 Abstract ( )   PDF (928KB) ( )   Vehicle life cycle evaluation is an important tool to explore whether the vehicle has good energy saving and emission reduction benefits and economic benefits. This paper systematically introduces the definition and methodological framework of life cycle costing (LCC) research, life cycle assessment (LCA) and hybrid life cycle assessment (HLCA). Then the research status of vehicle life cycle evaluation is reviewed from four aspects: evaluation scope, evaluation method, evaluation index and identification of important influencing factors. Finally, the future development direction of automotive life cycle research is proposed from the aspects of developing multi-objective optimization, strengthening model dynamics and applying multi-dimensional evaluation results. The results of this study provide a reference for more comprehensive and accurate comprehensive assessment of vehicle cost and its environmental impact in the future. References | Related Articles | Metrics