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Optimization of Process Parameters of Module Laser Welding with DOE Based on Minitab FAN Yuyang Automobile Applied Technology    2023, 48 (20): 145-150.   DOI: 10.16638/j.cnki.1671-7988.2023.020.029 Abstract （557）      PDF （1478KB）（170）       In recent years, with the development of technology, the application of laser welding is gradually popularized, and laser welding is widely used in manufacturing industry, especially automobile manufacturing industry. At present, laser welding is widely used in lithium-ion battery manufacturing, such as module Busbar welding. Laser welding has many advantages, such as high welding speed, small deformation and high precision, it also has higher requirements for tooling and welding parameters. Reflective lens and other components, different equipments have similar welding properties, and welding parameters have mutual influence, which jointly affect the welding quality. In order to obtain better welding quality, in addition to the basic functional performance acceptance of new equipment, the influence between equipment parameters should be further obtained, so it is necessary to verify the parameters of laser welding equipment in an all-round way. It has become an important research aspect for welding process engineers to carry out multi-factor parameter verification tests and study the influence of the interaction between equipment parameters on welding quality. In this paper, the commonly used welding parameters are selected for design of experimen (DOE) verification, and the degree of factor interaction is obtained, and the theoretical optimal solution is calculated and optimized by Minitab tool. Reference | Related Articles | Metrics

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Review of Vehicle Distance Measurement Based on Monocular Vision ZHANG Zhaozhen Automobile Applied Technology    2022, 47 (4): 153-157.   DOI: 10.16638/j.cnki.1671-7988.2022.004.036 Abstract （508）      PDF （1972KB）（60）       Reference | Related Articles | Metrics

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Fault Analysis of Low Voltage Power on Failure of BYD Qin EV WU Mingda Automobile Applied Technology    2024, 49 (3): 117-120.   DOI: 10.16638/j.cnki.1671-7988.2024.003.022 Abstract （502）      PDF （893KB）（117）       With the support of the country for the new energy vehicle industry, the number of new energy vehicles is constantly increasing, and the failure rate of vehicles is also increasing. This article takes the BYD Qin EV model, which has a high market share, as an example to mainly introduce the working principle and common faults of low-voltage power on. In the diagnostic process, a rigorous diagnostic approach is extremely important for maintenance personnel. This article provides a detailed explanation from four aspects: describing the fault phenomenon, analyzing the possible causes of the fault, diagnosing steps, and analyzing the fault mechanism. Through analysis, a diagnostic approach is established to provide certain reference information for vocational college teachers and maintenance practitioners in the maintenance teaching process. Reference | Related Articles | Metrics

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Research on Power System Matching of Pure Electric Commercial Vehicle LI Zetian Automobile Applied Technology    2021, 46 (16): 1-3.   DOI: 10.16638/j.cnki.1671-7988.2021.016.001 Abstract （500）      PDF （1276KB）（236）       In this paper, four powertrain schemes are designed based on pure electric commercial vehicle. According to the requirements of the vehicle's dynamic performance and economic index, the parameters of the power system were first matched, and then the speed ratio parameters of the transmission system were optimized by using the multi-island genetic algorithm. Finally, the actual operating conditions of xi'an city were imported into the cruise software for simulation comparison. The results show that the performance of the vehicle can be improved by optimizing the speed ratio parameters. The four powertrain schemes designed meet the requirements of the vehicle performance index under the actual working condition in xi 'an, among which the double-motor powertrain scheme is more economical. Reference | Related Articles | Metrics

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Simulation and Analysis of Power Performance of Pure Electric Vehicles Based on MATLAB LI Kai Automobile Applied Technology    2023, 48 (9): 1-5.   DOI: 10.16638/j.cnki.1671-7988.2023.09.001 Abstract （498）      PDF （638KB）（416）       Power performance is the most basic and important performance of pure electric vehicles. Modeling and simulation analysis of the whole vehicle power of pure electric vehicles is of great significance to improve the design level of new energy vehicles. In this paper, the maximum speed, acceleration ability and climbing ability are selected as the power evaluation indicators of pure electric vehicles and the power model of pure electric vehicles is established. Then the model is simulated by MATLAB to obtain the power simulation curve of pure electric vehicles. Finally, the main factors affecting the power of pure electric vehicles are analyzed. The results show that motor peak power and air drag coefficient are the main factors affecting the power performance of pure electric vehicles. Reference | Related Articles | Metrics

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Fault Diagnosis and Troubleshooting of BYD Qin EV Charging System WANG Yu Automobile Applied Technology    2022, 47 (16): 1-5.   DOI: 10.16638/j.cnki.1671-7988.2022.016.001 Abstract （451）      PDF （5250KB）（185）       A 2019 BYD Qin EV battery electric vehicle has a failure to charge. This article takes the failure to charge as a starting point, introduces the difference between the 2019 BYD Qin EV and the same model of the previous generation, and briefly explains the working principle and process of the chargings system. Combined with the actual situation, the paper summarized several common fault phenomena and corresponding data flows in the system, and pointed out the possible range of faults by combining phenomena. In addition, combining the problems that novices are prone to, we propose specific fault diagnosis methods for reference. Reference | Related Articles | Metrics

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Analysis of Electrical Power Steering PDC Function Principle and Optimization on Pull to Right Issue of Vehicle LIU Xiaoyun Automobile Applied Technology    2023, 48 (23): 36-40.   DOI: 10.16638/j.cnki.1671-7988.2023.023.007 Abstract （428）      PDF （979KB）（185）       Vehicle running off is a common failure mode that affects vehicle performance. According to the vehicle running and deviation characteristics, three stages of pull drift compensation (PDC) function scene identification, compensating torque calculation and PDC compensating torque output are proposed. The test indexes time to drift (TTD) and torque to track (TTT) are included into the performance indexes of PDC function acceptance. The contribution of PDC function to the optimization of deviation problem is expounded and demonstrated, which has certain engineering application value. Reference | Related Articles | Metrics

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Layout Analysis of Range Extender for Methanol Fuel Cell Based on Thermal Management ZHOU Yafu Automobile Applied Technology    2022, 47 (4): 1-6.   DOI: 10.16638/j.cnki.1671-7988.2022.004.001 Abstract （355）      PDF （4104KB）（59）       Due to the limitations of pure electric vehicle power storage batteries, fuel cells have become a research hotspot for electric vehicle range extenders with their high efficiency, pollution-free, and high reliability. This paper takes a pure electric vehicle on the market as the research object, arranges the methanol fuel cell range extender in the front compartment of the vehicle, and simulates the temperature distribution of the three-dimensional model of the fuel cell range extender at different vehicle speeds. The simulation results show that when the vehicle is stationary, the methanol fuel cell working at the rated power will affect the normal operation of the front compartment components; when the vehicle is driving at a speed of more than 30 km/h, the influence of the fuel cell range extender on the front compartment components can be ignored. The test results verify the reliability of the simulation results. It has certain reference value for the layout of the fuel cell range extender of the actual vehicle and the formulation of the control strategy. Reference | Related Articles | Metrics

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Diagnosis and Analysis of BYD Qin Hybrid Low-voltage Unenergized Fault ZHU Lusheng Automobile Applied Technology    2023, 48 (7): 160-164.   DOI: 10.16638/j.cnki.1671-7988.2023.07.032 Abstract （345）      PDF （1693KB）（91）       In order to solve the low-voltage unenergized failure of BYD Qin hybrid, according to the circuit diagram and maintenance manual, analyze the low-voltage energized process, and summarize the diagnosis process of low-voltage unenergized fault. Finally, taking two real faults of 2019 Qin hybrid as examples, according to the diagnosis process, through two real vehicle troubleshooting cases, the feasibility of the diagnosis method is verified, which provides a certain reference for similar fault diagnosis. Reference | Related Articles | Metrics

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Analysis of Development Status and Prospect of New Energy Vehicles ZHAI Jiatian Automobile Applied Technology    2023, 48 (20): 193-198.   DOI: 10.16638/j.cnki.1671-7988.2023.020.039 Abstract （341）      PDF （1306KB）（158）       With the progress of social development, China has continuously increased its requirements for vehicular exhaust emission. New energy vehicles, as a new, eco-friendly, and efficient industry, conforms to the concept of green energy and can effectively reduce environmental pollution. In recent years, the technology level of new energy vehicles has continuously improved, and the overall performance of vehicles has greatly increased. At the same time, under the full support of the national government, the new energy vehicle industry has developed rapidly, and the market scale has continued to expand. This article provides a comprehensive analysis of the current development status of China's new energy vehicle industry, summarizes the existing problems, and puts forward targeted and reasonable suggestions, aiming to provide valuable reference for promoting the long-term development of China's new energy vehicle industry. Reference | Related Articles | Metrics

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Research Review on Thermal Management of New Energy Vehicles MA Haoran Automobile Applied Technology    2023, 48 (8): 1-9.   DOI: 10.16638/j.cnki.1671-7988.2023.08.001 Abstract （338）      PDF （3142KB）（283）       With the continuous popularity of new energy vehicles, in order to solve the range and thermal safety problems of new energy vehicles in winter and summer, it is necessary to thermal manage new energy vehicles. The contents of new energy vehicle thermal management include winter cockpit heating, summer cabin cooling, battery cooling and heating, motor heat dissipation and power electronic components heat dissipation. The paper expounds the common scheme of new energy vehicle air conditioning and the thermal management scheme of battery and motor, and analyzes the advantages and disadvantages of various schemes. This paper can have certain guiding significance for the research and development of new energy vehicle thermal management technology. Reference | Related Articles | Metrics

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Analysis of the Ownership Status and Development Trend of New Energy Vehicle in China LI Chengxin Automobile Applied Technology    2024, 49 (4): 8-12.   DOI: 10.16638/j.cnki.1671-7988.2024.004.002 Abstract （313）      PDF （598KB）（215）       Against the backdrop of the "dual carbon" strategy, thanks to strong government support, China's new energy vehicle industry has made rapid technological progress and achieved commercialization. The annual sales volume of new energy vehicle has repeatedly reached new highs, and the ownership has steadily increased. To further promote the high-quality development of new energy vehicle, analyze relevant policies for new energy vehicle, discuss the evolution and development trend of new energy vehicle ownership from the perspective of market structure and product technology, summarize the problems of insufficient product competitiveness and inadequate infrastructure in its development process, and propose related suggestions for continuously promoting the development of core technologies, vigorously developing supporting infrastructure, and reducing manufacturing costs. Reference | Related Articles | Metrics

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Driving Style Recognition Based on Vehicle Driving Data LU Yibin Automobile Applied Technology    2023, 48 (18): 194-197.   DOI: 10.16638/j.cnki.1671-7988.2023.018.038 Abstract （306）      PDF （1233KB）（124）       Driver's driving style is an important impact on fuel economy and driving safety. This paper summarizes the research on driving style recognition based on vehicle driving data. Firstly, it introduces the basic process of driver's driving style recognition, and then discusses the algorithm models used by different scholars in driving style recognition, including support vector machine (SVM) algorithm, back propagation (BP) neural network algorithm and random forest model algorithm. Then, based on the actual vehicle driving data, different driving style recognition models are used to realize the analysis, and finally the research work of driver driving style recognition is prospected. Reference | Related Articles | Metrics

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Research on the Measurement Method of Insulation Resistance of Electric Vehicle GAO Feng Automobile Applied Technology    2021, 46 (24): 5-9.   DOI: 10.16638/j.cnki.1671-7988.2021.024.002 Abstract （305）      PDF （767KB）（228）       GB/T 18384.1—2015[1] gives a method for measuring the insulation resistance of the active circuit of electric vehicles. The calculation formula of the insulation resistance of this method includes voltage parameters. However, if a voltmeter is used to measure the circuit voltage directly, the measured value will often not reflect the true voltage of the circuit under test, therefore the calculation results will not be right. To solve such problems, this paper analyzes the influence of the internal resistance of the voltmeter on the circuit, and derives the expression of the degree of closeness between the measured value and the theoretical value. Based on analysis above, a new method of insulation resistance measurement is proposed. The core is to incorporate a pair of equivalent resistances that are at least two orders of magnitude smaller than the internal resistance of the voltmeter in the circuit, so that the measured voltage of the voltmeter can represent the circuit voltage, and the calculated result is the parallel value of the insulation resistance and the incorporated resistance. And then the correct insulation resistance value can be obtained through the resistance parallel formula. Finally, this paper puts forward thinking from the two dimensions of theory and practice to the insulation resistance measurement method of GB 18384—2020[2] . Reference | Related Articles | Metrics

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Application and Development of Artificial Intelligence in the Field of Automobile Driving Technology YANG Kang Automobile Applied Technology    2022, 47 (11): 16-19.   DOI: 10.16638/j.cnki.1671-7988.2022.011.004 Abstract （302）      PDF （522KB）（134）       The application of artificial intelligence in the field of automotive driving technology has been a major trend and has a good development prospect. In order to better explore the role and value of AI in the field of automotive driving technology, the article provides a detailed introduction to the application of AI in driver assistance, partial driverlessness, standard driverlessness, aspect ratio driverlessness, completely driverlessness, driverless deep neural network, driverless resource sharing, etc. On this basis, the challenges and prospects of AI applications in autonomous driving are analysed to provide reference for relevant researchers. Reference | Related Articles | Metrics

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Analysis of Influencing Factors of Consumers' Purchase of New Energy Vehicles XU Ling Automobile Applied Technology    2023, 48 (14): 33-36.   DOI: 10.16638/j.cnki.1671-7988.2023.014.007 Abstract （282）      PDF （742KB）（104）       The number of new energy vehicles has continued to increase in recent years, but by the end of 2021, new energy vehicles in China accounted for only 2.6% of the total number of vehicles. Consumers have little awareness of new energy vehicles and are not willing to buy. From the perspective of consumers, this paper studies the factors that affect consumers' purchase of new energy vehicles through questionnaires, and uses frequency analysis, chi-square test and other methods to analyze the influencing factors. The results show that the important influencing factors for consumers to purchase new energy vehicles are battery range, imperfect charging infrastructure and lack of understanding of new energy vehicles, can effectively promote the consumption of new energy vehicles. Reference | Related Articles | Metrics

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The Middle Ware of Data Distribution Service and Its Application in Automobile Field SHI Wenzheng Automobile Applied Technology    2023, 48 (16): 12-18.   DOI: 10.16638/j.cnki.1671-7988.2023.016.003 Abstract （277）      PDF （976KB）（70）       At present, service oriented architecture (SOA) occupies an increasingly important role in vehicle software, and communication middleware is one of the key links in the implementation of SOA. The advantages of data distribution service (DDS) in the automotive field have gradually become prominent. But there is little mention in the literature about the deployment and application of DDS on vehicles. The basic principle, publish-subscribe model and quality strategy of service of DDS is introduced in this paper detailly. Then the whole communication process of DDS and three different forms of DDS deployment on vehicles are introduced. Finally, taking FAST DDS as an example, the specific process of DDS deployment on vehicles is introduced in detail. The communication middleware based on DDS has a wider application prospect in automotive industry. Reference | Related Articles | Metrics

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Research on Compatibility of Friction Noise of Interior Materials PENG Yun Automobile Applied Technology    2024, 49 (1): 99-105.   DOI: 10.16638/j.cnki.1671-7988.2024.001.019 Abstract （276）      PDF （3417KB）（178）       In order to reduce the risk of friction noise in the forward development process of automotive interior in advance, and reduce the trial and error cycle and cost of physical verification. This article introduces the basic principle of material stick-slip effect and material stick-slip friction test, and analyzes the risk level of friction noise caused by commonly used interior materials under different working conditions. A database has been established for the compatibility of friction noise of commonly used interior materials under normal temperature and humidity conditions, providing guidance for material selection in the early stage of product design. At the same time, the engineering application of the interior material noise compatibility database is introduced, guiding the forward control of interior friction noise. Reference | Related Articles | Metrics

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Intelligent Remote Speed Limit Method for New Energy Vehicles HUANG Lihua Automobile Applied Technology    2022, 47 (14): 9-11.   DOI: 10.16638/j.cnki.1671-7988.2022.014.003 Abstract （271）      PDF （515KB）（37）       Abstract: The more common remote control technology on the market is limited to the realization of auxiliary system control such as door locks, doors and windows, and air conditioners, and has not yet achieved safe and reliable remote speed limit control for the entire vehicle. This paper designs a set of intelligent remote speed limit system for new energy vehicles. According to user needs, the vehicle can be remotely controlled on the App or monitoring platform. The vehicle's on-board terminal receives the remote control command. After that, it is stored in the memory, and the speed limit command is sent to the CAN bus. The vehicle-mounted terminal then feeds back the final execution result to the monitoring platform and App after algorithm integration based on the vehicle status and the execution result fed back by the vehicle controller. In this paper, an intelligent remote speed limit method for new energy vehicles is designed and developed, which realizes the remote setting of multiple gears of the maximum speed for different user vehicle scenarios, so as to ensure the safety of users such as the elderly and children. Reference | Related Articles | Metrics

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Technology Status and Development Trend of New Energy Vehicle ZENG Jiacheng Automobile Applied Technology    2023, 48 (14): 189-194.   DOI: 10.16638/j.cnki.1671-7988.2023.014.037 Abstract （255）      PDF （1605KB）（140）       According to the three types of new energy vehicles and their key core technologies at home and abroad, this paper summarizes their research status and development trend. In the research of pure electric vehicle and its key technologies, further improve the power density of power battery, the responsiveness of battery management system and the integration of drive motor. In the research of hybrid power system, the research on torque coupling, power coupling and energy synergy management needs to be accelerated. In the research of fuel cell vehicles, the high performance and long life of the stack, the research and development of the key components of the air/hydrogen supply system and the research of the cooling system are the primary tasks of its development. Reference | Related Articles | Metrics