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Research on the Deformation of Gradient High Scroll Wrap under Thermosolid Coupling LI Annan Automobile Applied Technology    2024, 49 (6): 163-168.   DOI: 10.16638/j.cnki.1671-7988.2024.006.030 Abstract （31）      PDF （2888KB）（213）       In order to solve a series of problems caused by the deformation of the scroll teeth, a new tooth design scheme－the graduated tooth height scroll tooth is proposed. The tooth head sticking problem is minimized by increasing the tooth height outward annularly, and the effects of gas pressure and temperature fields on the graduated tooth height scroll teeth are simulated by using ABAQUS to establish a finite element model. The results of the study show that the maximum deformation of the center of the scroll tooth is 13 μm under the thermosolid coupling. As the volume of the central compression chamber decreases, the maximum deformation of the scroll teeth increases, which provides a certain theoretical basis for the design of compressor structure and performance optimization. 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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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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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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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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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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Overview of Lightweight Technology for Commercial Vehicle WANG Xiaolong, FENG Shirong Automobile Applied Technology    2025, 50 (1): 136-141.   DOI: 10.16638/j.cnki.1671-7988.2025.001.028 Abstract （80）      PDF （1474KB）（158）       The lightweight design of commercial vehicles is one of the current research hotspots in the automobile industry. By reducing the weight of vehicles, it can effectively improve fuel economy, reduce carbon emissions, and improve vehicles handling performance and safety. This paper discusses the background and significance of lightweight commercial vehicle in detail, focusing on the application of aluminum alloy, high strength steel and composite materials in body structure, wheels and chassis. At the same time, introduces the application of advanced manufacturing technologies such as 3D printing, laser welding and integrated die casting technology in lightweight design, and the corresponding connection technology, such as riveting, bonding and bolted connection. Typical case studies demonstrate the practical effects of lightweight measures, including improved fuel economy, reduced carbon emissions and improved vehicle performance. Finally, this paper summarizes the positive impact of lightweight design on the overall performance of commercial vehicles, and looks forward to the future development direction. 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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Development Status and Trends of Humidifiers for Automotive Fuel Cell Engines ZHANG Shenglei Automobile Applied Technology    2024, 49 (6): 38-42.   DOI: 10.16638/j.cnki.1671-7988.2024.006.007 Abstract （58）      PDF （1291KB）（132）       The humidifier, as the core component of the air supply system in the fuel cell balance of plant (BOP), delivers air with stable flow and humidity to the fuel cell engine. It plays a crucial role in maintaining humidity balance, protecting membrane electrode components, and improving fuel cell performance. It is crucial for the stable operation and performance improvement of the fuel cell system. This article reviews and analyzes the current development status of humidifiers, compares the performance and parameters of mainstream humidifiers in the current market, and looks forward to the technological development trend of humidifiers based on the industry development status. 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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Design and Research on Automatic Hill-hold Function for Battery Electric Vehicles DENG Jianming Automobile Applied Technology    2024, 49 (10): 1-5,26.   DOI: 10.16638/j.cnki.1671-7988.2024.010.001 Abstract （83）      PDF （454KB）（116）       This paper investigates a method for implementing automatic hill-hold functionality in batterry electric vehicles using an electro-hydraulic braking (EHB) system. The approach leverages the existing slope sensor and EHB electronic brake assist system in battery electric vehicles to achieve automatic auxiliary parking assistance. In contrast to the conventional method of relying on the electric motor's immobilization, which carries the risk of motor fatigue and durability issues, this method achieves nearly 1 h of auxiliary hill-hold functionality without the need for electronic parking brake (EPB) hardware, thus reducing system costs and complexity. Through analysis of experimental data and charts, this paper evaluates the stability and adaptability of the automatic hill-hold function under different slopes and road conditions, as well as the response time and dynamic performance when the driver presses the accelerator pedal. The results showcase the performance advantages and effectiveness of this method. This technology contributes to enhancing driving safety and comfort, providing technical support for the intelligent development of battery electric vehicles. 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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Simulation Analysis of Fuel Cell Thermal Management System GENG Haowei Automobile Applied Technology    2023, 48 (20): 15-19.   DOI: 10.16638/j.cnki.1671-7988.2023.020.004 Abstract （120）      PDF （976KB）（115）       In this paper, 120 kW hydrogen fuel cell system is taken as the research object, combined with thermal management requirements, the control strategy is simulated and analyzed. The simulation model of the hydrogen fuel cell thermal management system is built by AMESim software. The heat production of the reactor and the intercooler is taken as the input condition, and the inlet temperature of the reactor and the inlet and outlet temperature difference are taken as the evaluation index. Firstly, the simulation calculation of the rated working conditions is carried out, and it is obtained that under the rated working conditions, the inlet temperature of the reactor is 72.8 ℃, the outlet temperature is 79.1 ℃, and the temperature difference is 6.3 ℃. The water pump and heat sink meet the heat dissipation requirements. Then the full power simulation analysis shows that the water pump, fan and thermostat can well respond to the temperature change, and with the increase of heat generation, the inlet temperature of the reactor can be maintained within 75 ℃, and the temperature difference can be maintained within 8 ℃ , which meets the temperature control requirements of the reactor. Reference | Related Articles | Metrics

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Analysis on Energy Management of Battery Electric Passenger Vehicles ZHANG Xiaofeng Automobile Applied Technology    2023, 48 (21): 1-6.   DOI: 10.16638/j.cnki.1671-7988.2023.021.001 Abstract （84）      PDF （689KB）（114）       At present, the range anxiety is still one of the main complaints of battery electric passenger vehicles users. Based on the structure and characteristics of battery electric passenger vehicles, this paper analyzes three critical energy transfer paths (charging path, discharge path and energy recovery path) in actual driving scenarios. The optimization direction is put forward mainly from the aspects of charging loss, electric drive efficiency, drive shaft efficiency, brake caliper drag force, wheel hub bearing resistance moment, tire roll resistance, wind resistance, air conditioning load and low pressure load. It is intended to improve the actual driving range and reduce the user's range anxiety. 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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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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Research on Power System Optimization Control of Distributed Drive Electric Vehicle LUO Liangquan Automobile Applied Technology    2023, 48 (23): 1-5.   DOI: 10.16638/j.cnki.1671-7988.2023.023.001 Abstract （111）      PDF （772KB）（100）       In view of the redundant structure of the distributed four-wheel drive system of electric vehicle, the power control between the driving wheels is prone to interference coupling effect, so the power optimization control system of the four-wheel drive of electric vehicle is established. Combined with MATLAB and CarSim, the vehicle dynamics model and motor drive coordination optimization control model are established, including the upper control layer for calculating driving demand force and generalized stable yaw moment. By comparing the torque distribution control layer with the non-dynamic control system, the correctness and effectiveness of the optimized dynamic control system are verified, and the adaptive performance of the control system is better. Reference | Related Articles | Metrics

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The Analysis of Extreme Energy Consumption in Battery Electric Vehicle Operating Conditions Based on Vehicle Energy Flow Theory JI Mengyuan Automobile Applied Technology    2023, 48 (23): 19-25.   DOI: 10.16638/j.cnki.1671-7988.2023.023.004 Abstract （66）      PDF （931KB）（98）       In the analysis of braking energy recovery, the control strategy of braking energy recovery and testing of braking energy recovery are mostly studied, but the theoretical limits of vehicle energy consumption, braking energy recovery and effective energy recovery of the vehicle are not evaluated. Based on the theory of vehicle energy flow, the energy flow path of battery electric vehicle is sorted out, and the interrelationships between factors such as vehicle driving resistance, vehicle inertia potential energy, braking energy recovery, and motor efficiency in energy consumption calculation are sorted out, and the interrelationships are transformed into a calculation model to solve the theoretical limit values of energy consumption, braking energy recovery rate, and effective energy recovery rate of the entire vehicle under working conditions. The actual measurement results of a battery electric box transport vehicle indicate that the theoretical limit values of the energy consumption and effective energy recovery rate of the entire vehicle are within 2% of the actual deviation, and the limit values of the braking energy recovery rate are within 6% of the actual deviation. The calculation model is relatively accurate, and this provides a theoretical basis for reducing vehicle energy consumption, optimizing brake energy recovery control strategies, and balancing passenger comfort with brake energy recovery intensity. Reference | Related Articles | Metrics

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State of Health Estimation of Lithium-ion Batteries for Vehicles HU Huimin Automobile Applied Technology    2023, 48 (20): 1-4.   DOI: 10.16638/j.cnki.1671-7988.2023.020.001 Abstract （60）      PDF （494KB）（98）       Lithium-ion batteries are the main source of power for new energy vehicles, and their status of health estimation is closely related to battery maintenance, repair, and replacement. In this paper, battery capacity is selected as a direct health factor, three indirect health factors are extracted based on battery charging voltage curve, and the correlation between them and capacity is calculated using Pearson and Spearman correlation coefficients. The results show that the correlation between charge time equal voltage and capacity is the highest. Gaussian process regression (GPR) algorithm is selected to establish the state of health (SOH) estimation model, and conjugate gradient method (CGM) is selected to calculate the hyper parameter of the model, which can better estimate the SOH of lithium-ion batteries. Reference | Related Articles | Metrics

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The Development Status and Trend of Automotive Intelligent Cockpit ZHANG Hong, WU Yaheng* , LIU Peiwen, DONG Yiping Automobile Applied Technology    2024, 49 (18): 166-169.   DOI: 10.16638/j.cnki.1671-7988.2024.018.033 Abstract （86）      PDF （1084KB）（93）       With the continuous development of new energy and intelligent vehicle industries, traditional intelligent cabins can no longer meet the demand for intelligent vehicles. Major automakers have gradually integrated and upgraded cockpit functions such as liquid crystal display instruments, information entertainment, and display screens, in order to explore safer, smarter, and more comfortable of transportation modes. This article analyzes and summarizes the current development status of intelligent cabins and the situation of major car companies loading intelligent cabins. The main development trends of intelligent cabins are summarized in five aspects, including enhancing head up display to empower driving with a new visual experience, rich cabin functions and information that still need to be based on travel safety, ruan air conditioner and zero gravity seats will empower the cabin with a new upgrade, multi-modal interaction between humans and vehicles will empower the cabin with a seamless experience, and artificial intelligence generated content (AIGC) technology will empower the cabin scene to continuously upgrade, bringing users a comfortable,convenient and safe driving experience, in order to provide reference for the development of the intelligent cabin industry. Reference | Related Articles | Metrics