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14 March 2024, Volume 49 Issue 5 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Use and Maintenance
Automobile Education
Standards·Regulations·Management


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New Energy Vehicle

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Leakage Analysis and Risk Assessment of on-board Hydrogen System Based on Fault Tree LIU Guanghui 2024, 49(5): 1-8.  DOI: 10.16638/j.cnki.1671-7988.2024.005.001 Abstract ( )   PDF (603KB) ( )   Hydrogen has the characteristics of easy leakage, low ignition energy, and high risk of ignition and explosion, which can easily lead to hydrogen safety accidents. In order to explore the best way to prevent and control the leakage of fuel cell on-board hydrogen system and improve the safe operation level of fuel cell vehicles, this paper uses the fault tree analysis model to qualitatively and quantitatively analyze various possible paths of on-board hydrogen system leakage. The results indicate that there are at least 22 possible paths leading to leakage in the onboard hydrogen system, and the possibility of hydrogen leakage is not low. However, the risk of hydrogen ignition and explosion after hydrogen leakage is within an acceptable range. In situations where the severity of hydrogen explosion consequences is difficult to avoid, reduce the possibility of hydrogen system leakage in the vehicle, strengthen safety measures to prevent and control hydrogen leakage, and thus control the occurrence of hydrogen safety risks. References | Related Articles | Metrics

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Analysis of Physical Modeling Technology for Electric Vehicles WANG Xuejun 2024, 49(5): 9-13.  DOI: 10.16638/j.cnki.1671-7988.2024.005.002 Abstract ( )   PDF (586KB) ( )   This study aims to analyze the physical modeling technology of electric vehicles and its applications in typical fields, optimize the design and use of electric vehicles through technical analysis of the model. The article proposes a feasible modeling method based on the working principle and related theories of electric vehicles, and uses Newtonian mechanics based methods to establish a "two degree of freedom dynamics" formula model that can reflect the actual operating state of electric vehicles. The article adopts literature analysis and mathematical modeling methods to establish a physical model technology framework, which can deeply analyze and optimize the performance and safety of electric vehicles. It provides a basis for subsequent motion analysis, control strategy design, and performance optimization. This analysis is of great significance for promoting the development of electric vehicles. References | Related Articles | Metrics

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The Future Trend and Prospect of Electric Drive System Based on AI LUO Feng 2024, 49(5): 14-18.  DOI: 10.16638/j.cnki.1671-7988.2024.005.003 Abstract ( )   PDF (607KB) ( )   In this paper, the future development trend and prospect of electric drive system are systematically analyzed and studied based on artificial intelligence (AI). This paper analyzes the market demand and technological innovation of the electric drive system, analyzes the technical prospect of the electric drive system, discusses the future technological development and key technologies from the aspects of motor type, control strategy, fault diagnosis, etc., and gives the methods and suggestions based on AI. Through two case studies, two kinds of motor control systems based on deep learning and neural network are introduced, and experimental bench tests are carried out to verify the system performance and advantages. The article also analyzes the policy environment and standard setting based on AI electric drive systems, and predicts the development trends in the next few years. The results show that the application value and development potential of AI in the future electric drive system is huge, and it is a trend of future technology development, which provides some references and enlightenment for researchers and engineers in related fields. References | Related Articles | Metrics

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Analysis on Improvement for Fresh Air Load of Automobile Air Conditioning Air Intake Structure LIU Jie 2024, 49(5): 19-23.  DOI: 10.16638/j.cnki.1671-7988.2024.005.004 Abstract ( )   PDF (1145KB) ( )   The fresh air load of automotive air conditioning is an important research object to improve the driving range of battery electric vehicles. Scholars focus on the analysis of the minimum fresh air volume and the optimization control mode, so as to reduce the vehicle energy consumption and improve the driving range. However, in terms of engineering realization, based on the current mainstream fresh air structure of automobile air conditioning, the author finds that with the increase of vehicle speed, the higher the deviation between the actual minimum fresh air volume and the theoretical demand value, the higher the additional fresh air load. Therefore, this paper proposes an improved fresh air structure, which can improve the realization degree of the theoretical minimum fresh air volume at different vehicle speeds. The computational fluid dynamics (CFD) analysis of the improved fresh air structure shows that the minimum fresh air volume can be improved from 68 m 3 /h to 33.5 m 3 /h when the speed is 120 km/h, and the control limit of the minimum fresh air volume is improved by 49%. Moreover, when the CO2 threshold is 1 000×10-6 mg/L comfort mode, the fresh air heat load at 0 km/h, 50 km/h, 80 km/h and 120 km/h is optimized by 0%, 27%, 38% and 51% compared with the existing design. When the CO2 threshold is 2 000×10-6 mg/L energy saving mode, the heat load at 0 km/h, 50 km/h, 80 km/h and 120 km/h is optimized by 58%, 66%, 58% and 51% compared with the existing design. References | Related Articles | Metrics

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Comparative Analysis on Selection of Drive Motors for New Energy Vehicles LI Huijuan 2024, 49(5): 24-28.  DOI: 10.16638/j.cnki.1671-7988.2024.005.005 Abstract ( )   PDF (679KB) ( )   The selection of drive motors is a key link in ensuring superior performance, efficiency, and reliability of new energy vehicles, and the opinions of vehicle buyers play a crucial role in the new energy vehicle market and must be taken seriously. Based on this, this article first conducts interviews with more than 20 experts and identified 8 indicators applicable to the selection of new energy vehicle drive motors. Subsequently, in a new energy vehicle 4S store, more than 100 vehicle buyers are selected as the research subjects for importance evaluation and their weights are determined. It is found that the weight of the indicator A4 maximum power is 0.328, ranking first and receiving the most attention; the weight of indicator A5 operability is 0.022, ranking 8th and least noticed. Finally, this article compares and analyzes 8 indicators of four common new energy vehicle drive motors, hoping to provide reference for vehicle buyers, new energy vehicle manufacturers, and related researchers. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Design and Development of Intelligent Connected Vehicle Mode Management System LIU Qin 2024, 49(5): 29-35.  DOI: 10.16638/j.cnki.1671-7988.2024.005.006 Abstract ( )   PDF (996KB) ( )   Aiming at the feeding problems caused by high battery energy consumption in different working scenarios during the life cycle of intelligent networked vehicles, an automobile mode management system is designed and developed to reduce the energy consumption of the vehicle electronic control unit (ECU), achieve the purpose of saving battery energy, and help to improve the service life of the battery. Firstly, the demand of power management in vehicle life cycle is analyzed, and the overall design scheme of mode management system is proposed. Secondly, different vehicle modes are defined according to the use scenario, and power saving control is carried out through function degradation. Then, the mode switching logic strategy and the power saving control method of the mode are introduced. Finally, the average static current value is compared between normal mode and transport mode by real vehicle. The analysis shows that the static current of the vehicle is lower in the transportation mode, and the static time of the vehicle is improved to achieve the effect of energy saving, which verifies the effectiveness of the mode management system. References | Related Articles | Metrics

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Research on the Positioning Accuracy of Automatic Parking Based on Wheel Speed Pulse ZHANG Lei 2024, 49(5): 36-40.  DOI: 10.16638/j.cnki.1671-7988.2024.005.007 Abstract ( )   PDF (1072KB) ( )   The paper proposes a simple compensation method for the automatic parking positioning system based on the vehicle tire pulse. It addresses the issue of increased vehicle positioning accuracy error caused by variations in tire radius. Firstly, the method calculates the travel distance of each tire based on the tire pulse count during straight-line driving. Secondly, the traveling distances of the four wheels and the average traveling distance of the four wheels are calculated respectively based on the four-wheel pulses, and the four-wheel pulse lengths of the vehicle are compensated based on the calculated average traveling distance of the four wheels. Finally, it determines the vehicle's pose change based on the compensated tire pulse lengths. Real-world testing demonstrates that the compensated tire pulse lengths can improve the vehicle's positioning accuracy. References | Related Articles | Metrics

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Exploration of the Implementation of Open Source Software in Various Functional Areas of Automobiles ZHANG Xiang 2024, 49(5): 41-46.  DOI: 10.16638/j.cnki.1671-7988.2024.005.008 Abstract ( )   PDF (2520KB) ( )   In recent years, the automobile industry has developed rapidly in servitization, but the document-first closed-source software development model has limited the development of the industry. To this end, this method is introduced to non-programmers at the principle level by giving priority to the design of service interfaces, using cheap boards such as Raspberry Pi, using open source software, writing code through artificial intelligence, and downplaying the code writing part, emphasizing the realization of interface design compatibility through open source. Specifically, it includes the servitization and open source of basic electrical design, which transforms the design process into a more efficient and flexible service-oriented process; Artificial intelligence software is open-sourced, which encapsulates open-source artificial intelligence algorithms as services, making them widely used in a variety of scenarios; The intelligent cockpit operating system and ecological open source are convenient for car companies to choose according to their needs; The communication of the distributed system is open source, which is convenient for the early design of the system and the initial test of the bench. This solution can not only solve the problem of automotive software development, improve development efficiency and reduce costs, but also be an effective choice to mitigate geopolitical risks. In general, this open source strategy can help the automotive industry make greater breakthroughs and avoid more risks in the process of software and large models sweeping software development. References | Related Articles | Metrics

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A Case Study of a Typical Combined Driver Assistance Intelligent Vehicle Accident XU Chang 2024, 49(5): 47-51.  DOI: 10.16638/j.cnki.1671-7988.2024.005.009 Abstract ( )   PDF (1577KB) ( )   Intelligent vehicles improve road traffic safety, but they also introduce new safety hazards. The article analyzes the collision of a typical level 2 automated intelligent vehicle using event data recorder (EDR) and driving data. It is found that the driver had been using the combined driver assistance system for an extended period while experiencing fatigue driving. Despite repeated reminders from the system, the driver is unable to take over the vehicle and eventually the automated system downgraded and exited. The accident occurred when the vehicle deviated from the lane. Based on this case, the architecture diagram of the autonomous driving system and the logic diagram of the human-machine interaction mechanism are established, the importance of warning prompts and minimal risk strategies in guaranteeing the operational safety of intelligent vehicles is explored, and the deficiencies of the current human-machine interaction mechanism of intelligent vehicles are summarized and suggestions for improvement are put forward. References | Related Articles | Metrics

Design and Research

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Research on the CarSim/Simulink Co-simulation of Electric Control Hydraulic Braking System for Electric Vehicle HONG Cheng 2024, 49(5): 52-58.  DOI: 10.16638/j.cnki.1671-7988.2024.005.010 Abstract ( )   PDF (2417KB) ( )   Aiming at the electric control hydraulic braking system of a domestic electric vehicle, an anti-lock braking system (ABS) model is proposed based on the proportional-integral-differential (PID) control of slip rate to improve the braking performance of the vehicle and improve the braking effectiveness and safety on the opposite road surface. Firstly, the dynamic model of the hydraulic electric control braking system is established through Simulink software. Then, the PID controller based on slip rate is designed, and its effectiveness is verified by 1/4 vehicle model. Finally, S function is used to input the Simulink model of ABS controller into CarSim platform, and CarSim/ Simulink dual platform joint control simulation is carried out. The results show that the braking performance of the ABS system based on PID control of slip rate is better than that of the vehicle without ABS system, and the braking stability is more obvious on the split road. References | Related Articles | Metrics

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Mechanical Impact Analysis of Battery Pack Based on Finite Element Simulation DING Yuanzhang 2024, 49(5): 59-62.  DOI: 10.16638/j.cnki.1671-7988.2024.005.011 Abstract ( )   PDF (1639KB) ( )   Taking the battery pack of battery electric vehicles as the research object, the impact load is determined through GB 38031－2020 and perform finite element analysis. The transient response calculation of the battery pack is carried out using OptiStruct, and the results show that at 7 ms, the maximum stress at the lifting lug and bolt of the battery pack is 167.5 MPa, which is less than the material tensile strength of 270 MPa and meets the design requirements. Applying finite element analysis method for transient response analysis of battery packs in the early stages of development is beneficial for shortening the battery pack design cycle and reducing costs. References | Related Articles | Metrics

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Development and Verification of High Rack Force for Redundant R-EPS System ZHANG Ji 2024, 49(5): 63-66.  DOI: 10.16638/j.cnki.1671-7988.2024.005.012 Abstract ( )   PDF (1127KB) ( )   In order to satisfy the requirement of electric power steering product for large front weight vehicle, the research is taken on high rack force redundant R-EPS system. A new size of rack, ball screw and pulley-belt mechanism are designed creatively. The redundant electrical system proposal for R-EPS is defined. Fault tolerant mechanism is designed when electrical system is out of order. The steering effort and catch up characteristic both satisfy the requirement of vehicle. It is proved that the steering characteristic and reliability of high rack force of R-EPS satisfied the requirement by bench and road tests. References | Related Articles | Metrics

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Research on Semi-active Suspension Skyhook Control for Heavy Commercial Vehicles Based on TruckSim FAN Yangqiang 2024, 49(5): 67-71.  DOI: 10.16638/j.cnki.1671-7988.2024.005.013 Abstract ( )   PDF (2482KB) ( )   Suspension is one of the key components of the vehicle chassis system and has a significant impact on vehicle ride comfort. Traditional passive suspensions cannot adjust their damping according to the operating conditions of the vehicle, resulting in limited vibration reduction effects. Semi-active suspensions can adjust their damping in real time according to different operating conditions, effectively improving the ride comfort of the vehicle. This article establishes a simulation model of a semi-active suspension for a heavy commercial vehicle based on the skyhook control strategy using TruckSim and MATLAB/Simulink, as well as a simulation model of a traditional passive suspension. The vibration reduction effects of the two suspensions are compared. The results show that compared to traditional passive suspensions, semi-active suspensions based on skyhook control strategies can effectively improve vehicle ride comfort, with a reduction of 22.9% in the root mean square value of body acceleration, a reduction of 15.1% in the root mean square value of suspension dynamic deflection, and a reduction of 9.8% in the root mean square value of tire dynamic load. References | Related Articles | Metrics

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Research on the Comfort of Passenger Car Seat Headrest MA Zhaoqiang 2024, 49(5): 72-77.  DOI: 10.16638/j.cnki.1671-7988.2024.005.014 Abstract ( )   PDF (2412KB) ( )   Traveling by passenger car has become one of the indispensable modes of transportation in modern life, there are higher requirements for passive safety. As an important part of passive safety, car seat headrests have stricter safety design requirements. However, while increasing the safety requirements, the driving comfort is often reduced. The aim of this study is to meet safety requirements while increasing the comfort of drivers and passengers. This paper analyzes the comfort of seat headrest from three perspectives, these three influencing factors are head restraint modeling, foam performance and skin buoyancy. By improving the thickness of the foam and optimizing the shape structure, the head comfort of the drivers and passengers is improved, and the driving experience is improved. References | Related Articles | Metrics

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Research and Design of Oxygen Production System Based on Vehicle Scheme YANG Jun 2024, 49(5): 78-83.  DOI: 10.16638/j.cnki.1671-7988.2024.005.015 Abstract ( )   PDF (982KB) ( )   In the context of the increasing popularity of electric vehicles, healthy driving as an important dimension of intelligent cabin has been increasingly valued. Controlling the oxygen concentration in the driver's cabin is beneficial for the driver's health, especially for long-distance drivers, which can effectively help them dispel drowsiness, maintain a fresh mind when driving, and avoid accidents. This paper introduces the design principles and requirements of the on-board oxygen production system, and expounds the functional characteristics and performance advantages of onboard oxygen production system in the context of the current intelligent cabin of the vehicle. Specifically, this paper gives an optimal structure plan based on the oxygen production equipment of the whole vehicle by selecting the appropriate oxygen production method. On the basis of this plan, this article designs a control logic strategy for achieving automatic adjustment of oxygen content in specific driving scenarios, making this function more intelligent and convenient during use. Compared to the oxygen generator independently installed by consumers in the later stage, the technical advantages of using an on-board oxygen generator based on the vehicle scheme include direct energy input source, convenient human-machine interaction experience, and reliable assembly process, which also provide consumers with a complete functional experience and comprehensive quality assurance. References | Related Articles | Metrics

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Technical Optimization and Verification of Improving Subjective Perception of Commercial Vehicle Braking CHENG Gongcan 2024, 49(5): 84-87.  DOI: 10.16638/j.cnki.1671-7988.2024.005.016 Abstract ( )   PDF (1628KB) ( )   In order to improve the braking performance and comfort of commercial vehicles and meet the braking needs under harsh working conditions, the ground adhesion coefficient of special working conditions is analyzed. Through theoretical calculation, different sizes of brake chambers and brakes are matched to obtain the optimal braking strength curve. Combined with the optimization of the output curve of the dual chamber brake master valve, the expected braking effect of the driver is achieved; By optimizing the brake chamber and output curve, and combining experimental verification and multi sample verification under market conditions; The results show that the optimized braking system has increased driver satisfaction by more than 50%. References | Related Articles | Metrics

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Opening Failure Analysis and Optimization of Plastic Fuel Filler Door Assembly for a Vehicle LI Nan 2024, 49(5): 88-91.  DOI: 10.16638/j.cnki.1671-7988.2024.005.017 Abstract ( )   PDF (1980KB) ( )   Aiming at the opening failure of the fuel filler door assembly in the opening and closing durability process of a certain model, through physical inspection and dimensional chain analysis, the failure cause is the deformation of actuator base, which leads to the out-of-tolerance of parts. At the same time, through the disassembly of the faulty parts, it is found that there are scratches and wear between the internal components which results in the mechanism stuck on the operation process unable to operate. Through optimization measures such as mold anti-deformation optimization, strengthening process control and adjustment of matching relationship between components and other improvement measures, the precision of the actuator base is improved normal function and the opening and closing endurance test of actuator and fuel filler assembly passed smoothly. So as it proves that the improvement measures are effective and provide a reference for the follow-up projects. References | Related Articles | Metrics

Testing and Experiment

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A Method for Early Recognition of Brake Groan Noise SUN Ning 2024, 49(5): 92-96.  DOI: 10.16638/j.cnki.1671-7988.2024.005.018 Abstract ( )   PDF (1454KB) ( )   In order to recognize the potential Groan noise early and avoid the redevelopment of bench performance tests and other noise, vibration, harshness (NVH) tests, the mechanism of Groan noise is analyzed and used to investigate the relationship between Groan noise mechanism and torque vibration, and an early bench test method suitable for Groan noise is developed. Two different friction materials are selected, and according to the early bench test method formulated in this paper, the bench comparison and vehicle evaluation comparison carried out. The results show that the early identification method formulated in this paper is effective, and the bench results are highly consistent with the vehicle evaluation results. It is concluded that the Groan noise can be identified in advance by the method described in this article, thereby saving costs and time. References | Related Articles | Metrics

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Research on Predicting Following Distance Based on Long Short-Term Memory Model ZHANG Yin 2024, 49(5): 97-101.  DOI: 10.16638/j.cnki.1671-7988.2024.005.019 Abstract ( )   PDF (1250KB) ( )   Many forward collision warning systems currently rely on warning distance as a feature to alert drivers, so improving the accuracy of predicting following distance can effectively enhance the warning capability of such systems. In this study, a driving simulator is used to construct following scenarios, and behavior data of 41 drivers are collected. The experimental data are divided into training and testing sets in a 3:1 ratio. By using the drivers' following distance and speed as inputs to a long short-term memory model, the following distance is predicted and analyzed. The results show that the model using this dataset could accurately predict the drivers' following behavior, with good generalization performance and no overfitting. Furthermore, by testing different time window lengths, it is found that as the length of the testing set decreased, the prediction error increased. This study provides theoretical support for improving the accuracy of forward collision warning systems, thereby increasing drivers' acceptance of these systems. References | Related Articles | Metrics

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Research on Testing Method for Automotive Electrical Load GE Shengxun 2024, 49(5): 102-106.  DOI: 10.16638/j.cnki.1671-7988.2024.005.020 Abstract ( )   PDF (1223KB) ( )   Accurate testing of electrical load performance is an important basis for vehicle energy flow modeling. This paper proposes a testing method for electrical load power and equivalent resistance on the vehicle, and provides the testing principles and steps of direct and indirect testing methods. According to the actual measurement of the sample vehicle, the testing accuracy reaches a high level (coefficient of variation ≤1%), and direct testing is preferred; The equivalent resistance of the electrical load is 7%～9% higher under generator power supply than under battery power supply. Applying testing methods to compare the power of different automotive electrical appliances and finding directions for energy-saving optimization; When applied to the simulation calculation of electrical energy consumption under typical working conditions, the simulation deviation achieved is ≤5%. References | Related Articles | Metrics

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Performance Analysis of Transmission Hydraulic Valve Body and Common Failure Modes TAO Zhaoxin 2024, 49(5): 107-110.  DOI: 10.16638/j.cnki.1671-7988.2024.005.021 Abstract ( )   PDF (1735KB) ( )   As the core parts of automatic transmission, the performance of the valve body directly affects the driving quality of the car. Taking GF6 automatic transmission hydraulic system as an example, this paper introduces the calculation method of two performance indexes of valve body pressure and leakage in detail, and explains how to use these two performance indexes to analyze common problems of transmission hydraulic system through actual fault cases. This paper provides guidance and reference for valve body design and valve body fault analysis of automatic transmission. References | Related Articles | Metrics

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Analysis of the Influence of Non-drive Wheel Inertia during Fuel Consumption Test NI Hao 2024, 49(5): 111-115.  DOI: 10.16638/j.cnki.1671-7988.2024.005.022 Abstract ( )   PDF (1077KB) ( )   In order to improve the testing accuracy of the entire vehicle when conducting fuel consumption tests on a single axle chassis dynamometer, non driving wheel inertia tests are conducted on the chassis dynamometer based on the entire vehicle. The test values are used instead of empirical values, and the fuel consumption results are compared to verify the impact of using non driving theoretical inertia test values to load the results during fuel consumption testing. First, the chassis dynamometer is used to test the wheel inertia of the vehicle to obtain the load mass of the vehicle on the chassis dynamometer. Secondly, the universal characteristic of the vehicle are tested to obtain the fuel consumption of the vehicle at different engine speeds and powers. Then, through the universal characteristics of the whole vehicle, the fuel consumption in China heavy-duty commercial vehicle test cycle (CHTC) and China-World transient vehicle cycle (C-WTVC) under different wheel inertia (experience value and test value) are simulated and checked by the universal characteristics of the whole vehicle, and the fuel consumption difference between the test value and the experience value of the wheel inertia is finally obtained. The results show that the test accuracy of the single-axle chassis dynamometer can be effectively improved by using the test value of wheel inertia. References | Related Articles | Metrics

Process·Materials

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Design of Assembly Fixture for the Camshaft and Signal Panel of the Automobile Engine LI Hua 2024, 49(5): 116-120.  DOI: 10.16638/j.cnki.1671-7988.2024.005.023 Abstract ( )   PDF (1031KB) ( )   Through research on vehicle maintenance enterprises, it has been found that when automobile maintenance technicians assemble the camshaft and signal plate of the automobile engine, there is a significant assembly error in the position of the signal plate and the automobile engine camshaft, resulting in inaccurate camshaft position signals detected. The ignition time of the automobile engine is delayed or advanced, and there is a problem of significant assembly error. The paper focuses on the assembly problem of the camshaft and signal plate of Shanghai Volkswagen Octavia sedan. In response to the existing practical problems, the paper has consulted a large amount of literature and mapped the parts of the automotive engine camshaft and signal plate, obtaining accurate data and information. Combining with relevant knowledge of fixture design, a set of automobile engine camshaft and signal plate assembly fixtures has been designed, and automotive maintenance technicians use the assembly fixtures, which can quickly and accurately assemble the camshaft and signal plate, improving assembly quality and reducing labor intensity. As an ideal specialized assembly tool for automotive maintenance personnel, assembly fixtures have certain practical value. References | Related Articles | Metrics

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Technical Requirements for Pasting Soft Label on Vehicles DENG Yu 2024, 49(5): 121-124.  DOI: 10.16638/j.cnki.1671-7988.2024.005.024 Abstract ( )   PDF (1593KB) ( )   In order to ensure that the soft label of the vehicle is easy for production employees to paste during the manufacturing stage, partial pasting benchmarks are often defined in data design. However, how to define pasting benchmarks to facilitate operation and maintain aesthetics is a research focus in the industry. The article defines the initial pasting standards and verifies the physical effects of several models of H company, and elaborates on the technical requirements for pasting the vehicle's soft label from the aspects of pasting position, pasting positioning standards, and body structure, ultimately achieving the effect of easy operation and beautiful physical appearance. However, each vehicle model should still be analyzed on a case by case basis, fully considering the operability of labeling and the rationality of process arrangements during the production process, in order to achieve the best results. References | Related Articles | Metrics

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Investigation of Vehicle Fragrance Systems Effect to Interior Material XIAO Bingbing 2024, 49(5): 125-130.  DOI: 10.16638/j.cnki.1671-7988.2024.005.025 Abstract ( )   PDF (4825KB) ( )   Automotive interior odor is a topic of high concern for consumers, and the addition of fragrant systems is an important method for various automakers. However, the impact of fragrances on interior materials in a closed automotive environment is currently a blank area. In this paper, we analyze the main ingredient of fragrances and their effects on interior materials, and design two kinds of experiment to verify the effects. The test results show that even with the addition of fragrances under conventional aging test conditions, the materials themselves would not undergo significant changes. However, in the fragrance molecule deposition area, such as fragrance outlet, we preform liquid fragrance directly contact testing, the test results show that most materials will be corroded, especially PC/ABS parts. Based on this situation, we do one more round test with painting samples and evaluate the corrosion degree after test, and it is found that the painting samples had good corrosion resistance. It's recommended that in the subsequent vehicle design process, the high risk area should be designed as a painting part. References | Related Articles | Metrics

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Automatic Transmission Cleanliness Overview and Failure Effects QUAN Dong 2024, 49(5): 131-134.  DOI: 10.16638/j.cnki.1671-7988.2024.005.026 Abstract ( )   PDF (1718KB) ( )   The component cleanliness is an indicator used to express the cleanliness level of component, which is the limited value of pollutants remaining on a certain surface of components or products after cleanliness, involving the type, size, quantity and weight of particles. Compared with manual transmission, automatic transmission has more stringent cleanliness requirement, so the cleanliness of the in-depth study of automatic transmission research and development process and quality management process is very important. The paper summarizes the cleanliness of foreign mainstream transmission manufactures. Aim at the cleanliness of automatic transmission, from four dimensions to introduce, include the cleanliness standard, cleanliness inspection, process control and failure effection. The paper provides a reference for the cleanliness control of China transmission manufactures. References | Related Articles | Metrics

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Design and Application of Automobile Assembly Movable Stepladder XU Liang 2024, 49(5): 135-138.  DOI: 10.16638/j.cnki.1671-7988.2024.005.027 Abstract ( )   PDF (1407KB) ( )   The article designs a new type of movable stepladder with stable and balanced load and convenient movement, which can be used in the production process of automobile general assembly to improve the material space at the line, the flexibility of the workstation and the ergonomics of the operation. By describing the design structure and application principle of the new movable stepladder, analyzing the advantages of the new movable stepladder in the process of general assembly production by combining with the example of automobile luggage rack installation, it can provide reference for the design and selection of the general assembly stepladder in the automobile industry as well as the planning of the flexible layout of the production line. References | Related Articles | Metrics

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Research and Application of Machine Vision Technology in Automotive Stamping Field QIN Pingping 2024, 49(5): 139-142.  DOI: 10.16638/j.cnki.1671-7988.2024.005.028 Abstract ( )   PDF (4208KB) ( )   With the increasing intelligence of automotive stamping shop and the increasing demand for full process inspection in production, the application of machine vision technology in the field of automotive stamping is also becoming more and more widespread. This article analyzes the working principles of traditional machine vision algorithms and deep learning algorithms, and studies the main application scenarios of machine vision technology in the field of automotive stamping,such as defect detection, feature recognition, etc. The main workflow, algorithms, and advantages in practical application cases are elaborated in detail to promote the promotion and application of machine vision technology in the field of automotive stamping, and look forward to the development prospects of machine vision technology in the field of automotive stamping. References | Related Articles | Metrics

Use and Maintenance

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Fault Diagnosis and Exclude of Magotan B8L Engine Unable to Start XIE Yanchao 2024, 49(5): 143-147.  DOI: 10.16638/j.cnki.1671-7988.2024.005.029 Abstract ( )   PDF (1690KB) ( )   Taking the Magotan B8L selected for the "Automobile Troubleshooting" of the vocational national competition as the object, diagnosis and troubleshooting of typical component damage in the electrical system that causes the engine to fail to start. Firstly, the fault phenomena of the engine being unable to start are described: the entire vehicle is not powered on, the starter is not running, and the starter is not running, etc. Secondly, introduce the startup strategy of the Magotan B8L: vehicle power on strategy and starter operation strategy. Once again, select the failure to power on caused by damage to the ignition switch, failure of the starter due to damage to the power bus, the failure to operate the starter caused by damage to the starting relay and its circuit, and the failure to start the vehicle caused by damage to the crankshaft position sensor and its circuit. Finally, the faults of the ignition switch, power bus, start relay and its circuit, crankshaft position sensor and its circuit are diagnosed and eliminated. Without the use of a fault diagnosis instrument, a systematic, comprehensive, and effective troubleshooting method is provided for the failure of the engine to start caused by the damage to the four major components mentioned above. It also provides a detailed reference basis for diagnosing and troubleshooting other components. References | Related Articles | Metrics

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Analysis and Countermeasure of Auto-Power-on Problem of a Car-Radio YU Wei 2024, 49(5): 148-151.  DOI: 10.16638/j.cnki.1671-7988.2024.005.030 Abstract ( )   PDF (2760KB) ( )   A car radio has the problem of auto-power-on at zero kilometers and after-sales stage, which will cause battery feeding and other consequences. Starting from the circuit principle of the radio, this paper tests the reason of triggering auto-power-on by means of oscilloscope and other tools, locks the failed electronic components, and makes metallographic slice analysis to find the reason of the failure of the electronic components. According to the failure phenomenon of electronic components, the packaging is further studied, the end factors are investigated one by one, and the unfavorable factors are optimized. The tracking results show that the improved component performance and higher yield significantly reduce the defect rate of the radio and improve customer satisfaction. This paper introduces the radio power supply circuit and analyzes the problem of auto-power-on, which provides some solutions for other on-board electrical faults. References | Related Articles | Metrics

Automobile Education

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Exploration on the Construction of SPOC Course Platform for Automobile Construction under the Background of New Engineering GAO Yuzhi 2024, 49(5): 152-156.  DOI: 10.16638/j.cnki.1671-7988.2024.005.031 Abstract ( )   PDF (1135KB) ( )   Under the current emerging engineering concept advocated by the Ministry of Education, traditional classroom teaching and online teaching resources cannot provide a complete solution for students' learning in courses with strong theoretical and practical requirements such as Automobile Construction. Based on this, this article elaborates on the necessity of building an small private online course (SPOC) course platform from three aspects: curriculum construction, teacher teaching, and student learning, combined with the actual situation of school, and proposes the construction ideas of the SPOC platform for Automobile Construction. That is to combine the self built Automobile Construction course on school's online teaching platform with the massive open online course (MOOC) selected online to create a SPOC teaching platform suitable for our school's students' learning. Teachers update platform resources in real-time based on the development of new automotive technologies. In the teaching process, the platform is used as the carrier to run through the entire teaching process, achieving communication and interaction with students. Through online and offline teaching activities, the training requirements of emerging engineering subjects can be met. This study can provide theoretical basis and practical guidance for the construction of other courses. References | Related Articles | Metrics

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Exploration on the New Model of Cultivate Application-oriented Talents in Automobile Manufacturing Technology YU Yang 2024, 49(5): 157-160.  DOI: 10.16638/j.cnki.1671-7988.2024.005.032 Abstract ( )   PDF (1854KB) ( )   With the vigorous development of the new economy represented by the "Four New", it is imperative to cultivate application-oriented innovative talents who are truly "satisfied" rather than just "adapted" to the development of the industry, society and even the country. Here, the course goal of Automobile Manufacturing Technology is determined, and three key problems to be solved in the course teaching reform is prescribed precisely. In the course of curriculum reform, multi-level and diversified teaching methods combining online and offline are actively carried out. A course case resource library needs to be build up, integrating knowledge into intuitive cases, therefore realizing the deep integration of information technology and teaching content, and exploring a new way to reform the teaching mode of applied talents training for engineering courses. References | Related Articles | Metrics

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Exploration on the Cultivation Mode of the Postgraduate Students of Vehicle Engineering Major Facing the Reform of Automobile Industry GAO Wei 2024, 49(5): 161-164.  DOI: 10.16638/j.cnki.1671-7988.2024.005.033 Abstract ( )   PDF (1151KB) ( )   New challenges are posed to the cultivation of the postgraduate students of the vehicle engineering due to the transformation and upgrading of the automobile industry. This paper firstly analyzes the current situation of the automobile industry and its demand for talents. Secondly, the existing problems of postgraduate cultivation of vehicle engineering are analyzed. Finally, taking the cultivation of the graduate students majoring in vehicle engineering in Hubei University of Automotive Technology as an example, the cultivation mode of graduate students majoring in vehicle engineering is explored and practiced from the aspects of concise cultivation objectives, optimization of curriculum system, establishment of school-enterprise cooperation base, construction of tutor team, improvement of management mechanism and evaluation system, etc., which greatly improves the cultivation quality of graduate students of our university, and at the same time, it also provides some reference for the reform of cultivation mode of graduate students majoring in engineering. References | Related Articles | Metrics

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Exploration of Teaching Reform of New Energy Vehicle Design Course under the Background of First-class Curriculum Construction WANG Yao 2024, 49(5): 165-168.  DOI: 10.16638/j.cnki.1671-7988.2024.005.034 Abstract ( )   PDF (1056KB) ( )   In view of the problems existed in the teaching process of the new energy vehicle design course, such as boring teaching mode, lacking of advanced teaching content and single assessment method, curriculum reform exploration and research are carried out. Focus on the goal of first-class curriculum construction, we should innovate the teaching mode, enrich the teaching contents and improve the assessment methods. Integrate the scientific research and production into the curriculum teaching, create the innovative and challenging classroom atmosphere, and cultivate students' advanced thinking and continuous independent learning abilities. Meanwhile, integrate the ideological and political elements into the course to stimulate the students' cultural confidence,patriotism and responsibility. After the course reform of new energy vehicle design, the quality of the talents is increasing year by year. References | Related Articles | Metrics

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Teaching and Practice Innovation of Automobile Structure Course OUYANG Hongwu 2024, 49(5): 169-175.  DOI: 10.16638/j.cnki.1671-7988.2024.005.035 Abstract ( )   PDF (1838KB) ( )   Automobile Structure is a professional basic course with the core content of automobile structure and function, working principle and technical performance, vehicle matching and brand model. This paper aims at cultivating professionals who understand the industry, attach importance to technology and enjoy innovation, and follows the requirements of the first-class course of "gender equality": Compile teaching materials to complete knowledge reconstruction in time, creating knowledge maps and adjusting teaching methods to improve teaching efficiency; Carry out a series of special explorations and discussions to guide students to understand the driving force, development strategy and approach of contemporary automobile technology development; Give full play to the interactive effect of curriculum, ideology and politics, analyze the internal relationship and evolution characteristics of the complex composition of automobiles by using philosophical principles, explain the profound lessons of "the market can't change the core technology" in China's automobile industry and the successful practice of "overtaking by changing lanes" with a large number of examples, to stimulate students' learning enthusiasm and pioneering and innovative spirit; Strengthen practical teaching based on virtual simulation technology, take classic cars as examples, find out the technical connotation and value of "good cars". References | Related Articles | Metrics

Standards·Regulations·Management

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Research Progress of Real-time Accident Prediction Methods Based on Neural Networks YAN Tiance 2024, 49(5): 176-181.  DOI: 10.16638/j.cnki.1671-7988.2024.005.036 Abstract ( )   PDF (1096KB) ( )   As an important part of active road safety management, road traffic accident prediction plays an important role in reducing the probability of accidents and helping managers make safety decisions. With the increasing demand for data, traditional methods can no longer meet the needs of big data, and machine learning and artificial intelligence algorithms have shown strong potential in the field of road traffic accident prediction in dynamic, real-time and complex situations. This paper introduces the data acquisition and the selection of characteristic variables, describes in detail the relevant research of the neural network based on machine learning and the combination of the method with deep learning at home and abroad, analyzes the advantages and disadvantages of using the neural network correlation method in modeling, and finally summarizes and looks forward to the realtime traffic accident prediction method based on neural network, and gives the future development trend. References | Related Articles | Metrics

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Evaluation Method of Maintenance Performance of Heavy Duty Truck HAO Minggang 2024, 49(5): 182-184.  DOI: 10.16638/j.cnki.1671-7988.2024.005.037 Abstract ( )   PDF (1166KB) ( )   In order to improve the maintenance convenience and reduce the maintenance cost of heavy duty truck, this paper puts forward a maintenance evaluation method in the product design and development stage, which includes two aspects: maintenance convenience and maintenance cost. Through this method, the maintenance convenience of products can be evaluated scientifically and reasonably, and the problems finds can be optimized and improved in time. At the same time, taking the maintenance of a heavy tractor as an example, the evaluation method of maintenance cost is explained, and the point of view that long oil change can reduce maintenance cost is put forward. The evaluation method can not only provide reference for users, but also provide reference for engineering designers to improve. References | Related Articles | Metrics

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Exploration of Cost Reduction Workflow in Value Analysis of Process Engineering Field －Take B1B2 Water-based Paint Switch 1K Varnish for Example SHI Zhixue 2024, 49(5): 185-188.  DOI: 10.16638/j.cnki.1671-7988.2024.005.038 Abstract ( )   PDF (1153KB) ( )   To explore the process engineering field value analysis cost reduction workflow, the article value analysis value engineering (VAVE) automotive industry work experience, through B1B2 paint matching 1K varnish value analysis cost reduction practice, explore the cost reduction optimization point identification, feasibility analysis, goal setting, scheme design, validation, optimization, summarize the curing process, available for domestic commercial vehicle and parts production enterprise process engineering and technical personnel reference. References | Related Articles | Metrics