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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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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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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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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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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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Research Progress of Detection Methods for Fatigue Driving CHEN Jianzhe Automobile Applied Technology    2023, 48 (21): 179-186.   DOI: 10.16638/j.cnki.1671-7988.2023.021.036 Abstract （246）      PDF （1262KB）（113）       Fatigue driving is an important factor that induces traffic accidents, and it is of great research value and social significance to study how to quickly and accurately identify the fatigue state of drivers and provide fatigue warning before accidents occur to prevent fatigue driving and promote traffic safety. This paper introduces fatigue detection methods based on driver's physiological characteristics, vehicle behavior characteristics and driver's facial characteristics in comparison from the principle of fatigue detection, and analyzes the current status of research on fatigue driving detection based on machine vision and its characteristics, in order to provide new ideas for researchers. Reference | Related Articles | Metrics

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Method for Establishing Vehicle Coordinate System of Body Point Cloud Based on PolyWorks SHI Chao Automobile Applied Technology    2023, 48 (22): 99-103.   DOI: 10.16638/j.cnki.1671-7988.2023.022.018 Abstract （211）      PDF （2949KB）（29）       In the process of vehicle reverse alignment, the construction of vehicle coordinate system of body point cloud is a very important step in vehicle reverse alignment, which is the foundation of digital model of vehicle data reverse design, it is also an important basis for the study of the structural characteristics of automobile parts. Based on an engineering example, this paper uses PolyWorks software to construct the corresponding module of coordinate system, which can quickly and accurately construct the whole vehicle coordinate system of body point cloud, and proves the validity of this method. Reference | Related Articles | Metrics

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Research on Multiple-vehicle Collision Accident Reconstruction Based on PC-Crash Software LI Jian Automobile Applied Technology    2024, 49 (1): 32-38.   DOI: 10.16638/j.cnki.1671-7988.2024.001.007 Abstract （205）      PDF （1947KB）（92）       In the past three years, the average annual number of traffic accidents in China has been more than two hundred thousand times, and the number of multi-vehicle collision accidents has also increased year by year. This paper is based on a complex traffic collision accident, which is equivalent to multiple simplified collision accidents according to the sequence of vehicle collision time, and each collision process only contains two accident participants. By verifying the damage of the driver in the accident scene and the trace inspection of the accident vehicle, the degree of human injury, the collision form of each vehicle and the motion speed before the collision are analyzed, and the accident simulation is carried out with PC-Crash software and its authenticity is verified. The results show that the human injury condition obtained by simulation is consistent with the actual condition; Compared with the actual inspection data, the error of the final stopping position and collision velocity of the accident participant is less than 10%, indicating that the simulation results are consistent with the actual inspection results. This method can simulate the complex traffic collision accident and the simulation has a certain authenticity, which provides a theoretical support for the traffic management department to identify the accident responsibility. Reference | Related Articles | Metrics

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Research and Prospect on the Cycle Life Test Profiles of Traction Batteries for Vehicles HAO Weijian Automobile Applied Technology    2023, 48 (18): 188-193.   DOI: 10.16638/j.cnki.1671-7988.2023.018.037 Abstract （191）      PDF （1107KB）（91）       Cycle life is the core technical parameter of traction batteries, and cycle testing profiles are the core content of traction battery cycle life test. In order to further improve the cycle testing profiles of traction batteries, this work firstly analyzes domestic and overseas standards such as China light-duty vehicle test cycle for passenger car (CLTC-P) and new European driving cycle (NEDC), as well as academic vehicle driving profiles. Two methods for converting vehicle driving profiles from theoretical calculation or actual vehicle testing to traction battery conditions are introduced. The domestic and overseas cycle profiles of traction batteries are also shown. Finally, the direction of improving the cycling profiles of traction batteries is pointed out. This paper will provide reference for improving the cycling profiles of traction batteries in the future. Reference | Related Articles | Metrics

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Ultrasonic Measurement Method and Application of Bolt Preload LV Fengyang Automobile Applied Technology    2023, 48 (17): 144-149.   DOI: 10.16638/j.cnki.1671-7988.2023.017.026 Abstract （187）      PDF （1462KB）（165）       Bolt preload is one of the key factors affecting the reliability of bolt connection, and it is of great application value to measure bolt preload directly and accurately. Firstly, based on the principle of acoustoelastic effect, the relationship between ultrasonic propagation speed and axial stress of bolts is studied theoretically, and the calibration relationship between bolt preload and ultrasonic acoustic time difference is established in this paper. Secondly, the influencing factors of ultrasonic measurement of bolt preload are analyzed. Finally, the ultrasonic measurement method and application case of bolt preload are given. The MC900 ultrasonic measuring analyzer is used to monitor the preload attenuation of the dashboard beam and body bolts of a certain vehicle. The test results meet the durability and reliability requirements of the vehicle. The research results show that the ultrasonic preload measurement technology can well monitor the preload changing trend of bolt connection points during the endurance road test of the vehicle, and provide experimental basis for verifying the rationality of bolt tightening torque setting and analyzing the quality problem of torque attenuation. Reference | Related Articles | Metrics

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Module Expansion Force Analysis Based on Finite Element Simulation WU Bao Automobile Applied Technology    2023, 48 (24): 110-114.   DOI: 10.16638/j.cnki.1671-7988.2023.024.022 Abstract （169）      PDF （2384KB）（104）       In the cycle process, with the accumulation of charge and discharge times, the expansion force of the battery cell continues to increase, and the volume of the battery cell becomes significantly larger, which is manifested as the bulge of the battery cell, which may affect the structural performance of the entire module. Therefore, it is of great significance to study the expansion force of the cell and the effect of the expansion force on the structure of the end and side panels of the module. In this paper, the effect of foam on the expansion respiration is studied by using the equivalent form of thermal expansion to simulate the expansion force generated by the cell during the cycle. The results show that the foam has a certain effect on the absorption of expansion force, and the selection of suitable foam is of great significance for the cyclic expansion of the cell. Based on this model, the expansion comparison between the side-welded and the side-welded modules is studied. The expansion resistance of the side-welded modules is better than that of the side-welded modules, which provides guidance for the subsequent expansion design of modules. Reference | Related Articles | Metrics

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Fault Diagnosis and Exclude of Magotan B8L Engine Unable to Start XIE Yanchao Automobile Applied Technology    2024, 49 (5): 143-147.   DOI: 10.16638/j.cnki.1671-7988.2024.005.029 Abstract （169）      PDF （1690KB）（77）       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. Reference | Related Articles | Metrics

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Analysis of the Layout Architecture of the Electric Drive Assembly in the front Compartment of Battery Electric Vehicle WANG Renkun Automobile Applied Technology    2024, 49 (1): 1-6.   DOI: 10.16638/j.cnki.1671-7988.2024.001.001 Abstract （164）      PDF （1411KB）（138）       Electric drive assembly is the core component of battery electric vehicle, and its location is the key to the front compartment layout of the vehicle, which is related to the vehicle performance, front compartment architecture strategy and platform expansion ability. This paper aims to establish a layout architecture for the front compartment of battery electric vehicle, analyzes the spatial characteristics of the front compartment layout of battery electric vehicle, studies the relationship between the key size factors in the layout of the front compartment electric drive assembly around the position of the key components of the front compartment electric drive assembly, and summarizes the layout method of the front compartment electric drive assembly of battery electric vehicle and the layout principles of the surrounding subsystems. Reference | Related Articles | Metrics

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Design of Lane Keeping Assist System LI Yihong Automobile Applied Technology    2024, 49 (6): 88-93.   DOI: 10.16638/j.cnki.1671-7988.2024.006.016 Abstract （160）      PDF （1859KB）（62）       The lane keeping assist system (LKAS) has important safety functions and research significance, which can issue early warning and correct the deviation when the vehicle unintentionally deviates. A lane keeping assistance system is designed, which mainly includes lane departure warning module and lane centering control module. The data is collected by camera and image processing is done to determine whether the vehicle deviates from the lane according to the left and right lane lines and vehicle position status. If the vehicle deviates and the driver doesn’t actively control the vehicle, the departure warning sends out an audible and visual alarm and the control module adjusts the speed and direction of the vehicle. The vehicle approaches the center of the lane and drives along the center of the lane. The experimental vehicle is used to verify the lane keeping assist system. The results show that the system can realize lane departure warning and lane centering control, and has high stability and reliability. Reference | Related Articles | Metrics

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Simulation Analysis of Vehicle Handling and Stability Based on MATLAB LI Xiangyu Automobile Applied Technology    2023, 48 (24): 95-100.   DOI: 10.16638/j.cnki.1671-7988.2023.024.019 Abstract （148）      PDF （1417KB）（116）       In order to better evaluate the handling stability of the vehicle, a linear three degree of freedom vehicle model including roll motion is established on the basis of the linear two degree of freedom vehicle model, and its motion differential equations are organized. Based on MATLAB software, sensitivity analysis is conducted by simultaneously changing the size of certain specific parameters in the three degree of freedom model and the two degree of freedom model. The results indicate that reducing the driving speed of the vehicle and increasing the lateral stiffness or rotational inertia of the vehicle tires can effectively improve the handling stability of the vehicle, and the linear three degree of freedom vehicle model can better reflect the operational characteristics of the vehicle compared to the two degree of freedom vehicle model. Reference | Related Articles | Metrics

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Research Progress of Automatic Driving Lane Change Decision Algorithms Based on Learning YU Shijie Automobile Applied Technology    2023, 48 (24): 189-194.   DOI: 10.16638/j.cnki.1671-7988.2023.024.037 Abstract （144）      PDF （1303KB）（57）       Lane change decision is a key part of autonomous driving decision planning technology. Studying the lane change decision algorithms of autonomous vehicles can better realize the autonomous lane change of vehicles. In this paper, by consulting the existing literature on lane change strategies, the learning-based lane change decision-making algorithms for autonomous driving in recent years are classified and summarized. Firstly, the learning-based lane change decision-making methods are divided into two categories, based on traditional machine learning and based on reinforcement learning. Secondly, the decision-making algorithms are described in detail and the research is reviewed, and the advantages and disadvantages of each method are analyzed. Finally, the future research direction of autonomous driving lane change decision-making is prospected, which provides a reference for the research of vehicle autonomous lane change decisionmaking. Reference | Related Articles | Metrics

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The Future Trend and Prospect of Electric Drive System Based on AI LUO Feng Automobile Applied Technology    2024, 49 (5): 14-18.   DOI: 10.16638/j.cnki.1671-7988.2024.005.003 Abstract （143）      PDF （607KB）（70）       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. Reference | Related Articles | Metrics

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Construction and Realization of Resource Database of New Energy Vehicle Technology Based on OBE Concept ZHAO Congcong Automobile Applied Technology    2023, 48 (22): 173-177.   DOI: 10.16638/j.cnki.1671-7988.2023.022.034 Abstract （143）      PDF （1347KB）（9）       The development of information technology provides rich materials for teaching and promotes the construction of resource database. How to give full play to the effectiveness of the resource database to improve the quality of teaching and talent training has become an important research direction. Based on the analysis of the construction demand of New Energy Vehicle Technology resource database, this paper takes the concept of outcome based education (OBE) as the guide to construct the basic framework of resource database, analyzes the realization way of resource database, and illustrates the application of resource database in the online and offline blended teaching reform. The construction of the resource database based on the concept of OBE can reflect the dominant position of students learning, enhance the function of the resource database as "able to learn and auxiliary to teaching", and has great significance for improving students’ autonomous learning ability and teaching quality. Reference | Related Articles | Metrics

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Analysis of Transmission Cooling and Lubrication Demand and Optimization of Flow Distribution MA Xingyu Automobile Applied Technology    2023, 48 (20): 77-81.   DOI: 10.16638/j.cnki.1671-7988.2023.020.015 Abstract （140）      PDF （2367KB）（83）       This article proposes an equivalent calculation method for the equivalent liquid flow length and equivalent liquid flow diameter of different shapes of lubricating oil passages in the transmission during the forward development and design process of transmission products, taking into account the heat dissipation requirements of some components such as bearings and clutches in the mechanical body of the transmission. This is used as the basis for setting parameters in the simulation model, the cooling lubrication flow rate in the hydraulic lubrication system of the transmission is simulated using AMESim simulation software, and the flow distribution status under the maximum power, maximum speed, and maximum torque conditions of the transmission is calculated. The final flow distribution plan is determined through continuous iterative calculations. Reference | Related Articles | Metrics