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Comparative Study of Power Module Heatsinks on Electric Vehicle with Various Configurations Based on Fluent MA Yaqing Automobile Applied Technology    2022, 47 (6): 100-104.   DOI: 10.16638/j.cnki.1671-7988.2022.006.021 Abstract （80）      PDF （3964KB）（965）       Comparative study on the thermal simulation of heatsinks on electric vehicle with various configurations for Insulated-Gate Bipolar Transistor has been undertaken in this paper. For the purpose of validation of numerical module, a simulation was conducted in the first place for diamond pinfin heatsink. The reliability of the chosen fluid model, mesh density and material properties have been demonstrated through the close agreement between the numeral results and experimental data. With the verified model, a circular pinfin heatsink has been established to ensure the identical pressure drop with diamond one in order to identify the dimension of the circular pin. By introducing the power module with certain power loss, the thermal simulations on these two heatsinks have been carried out. Through the comparison of the numerical results, it has been shown that the junction temperatures of the power modules from circular configuration are about 1.5% higher than the ones from diamond one and the highest surface temperatures of the heatsinks are in good consistence. Nevertheless, these results comply with the product specifications.With the consideration of 27% weight loss compared to the diamond pinfin structure, circular pinfin configuration is assumed as a better choice for power module heatsink. In this study, the verified numerical model contributed to analyse the heat dissipation and temperature distribution of the power module and helped to select the optimum configuration of pinfin structure. Hence, the experiment cost and time for the product development can be substantially reduced. Reference | Related Articles | Metrics

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Optimization Analysis of Suspension Hard Points Based on Abnormal Tire Wear of Electric Vehicles CAI Yun1,2 Automobile Applied Technology    2023, 48 (5): 1-7.   DOI: 10.16638/j.cnki.1671-7988.2023.05.001 Abstract （109）      PDF （1033KB）（491）       The suspension hard point analysis and optimization design were carried out for the abnormal tire wear caused by the increasing body mass of electric vehicles. Adams/Car was used to establish the rigid-flexible coupling virtual prototype model of the double-arm front suspension, and it was verified that the increase of body mass would affect the matching relationship between the external inclination angle and the front bundle angle, and also increase the tire sideslip. In the optimal design is put forward to choose more hard points but only optimize the Z coordinate, quadratic optimization and optimization for the first time the results indicated that scheme is feasible, can sharply reduce the optimization computation and reduce development cycle, at the same time, the optimized electric model of double arm suspension fork wheel camber and toe angle got the matching relation between optimization, tire sideslip quantity greatly reduced, effectively reduce the abnormal tire wear. 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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Design of Traction Device for Heavy Dump Truck ZHANG Xiao Automobile Applied Technology    2022, 47 (5): 42-45.   DOI: 10.16638/j.cnki.1671-7988.2022.005.010 Abstract （164）      PDF （2364KB）（333）       According to the non-highway transportation conditions such as urban construction slag soil and mining area, the traction device of heavy dump truck is designed and studied in order to avoid the potential failure modes such as the bending of crossbeam, the fracture of device and the failure of threaded hole during the traction process, effectively reduce the loss of design quality, improve the design quality control level. The traction device is installed between the left and right extension beams. The left and right connecting seats meet the installation requirements of the left and right brackets of the bumper, the design should pay attention to the functional requirement, the strength requirement of the parts, the DMU check of the surrounding environment and the installation space of the front hook hand. When the vehicle is stuck in a mud pit, the towing hook can be connected with the towing device and the trap can be solved by dragging. In this paper, Hyperworks software is used to carry out three-dimensional modeling and stress analysis of the three plans of the traction device in the design phase, the design scheme should take into account the manufacturing process, assembly feasibility and economy of the parts and components, and determine the best scheme by synthesizing all factors, through the strain test and strength test, it is concluded that the parts meet the demand of heavy dump truck’s traction condition, and the application of the parts is tracked after they are put into the market in batches. Reference | Related Articles | Metrics

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Application of VAVE in New Energy Vehicle Industry LIU Wei Automobile Applied Technology    2021, 46 (16): 165-168.   DOI: 10.16638/j.cnki.1671-7988.2021.016.045 Abstract （117）      PDF （1042KB）（295）       In the context that China is the main battlefield of new energy vehicles in the world, combined with the unfavourable factors such as the gradually declining of state subsidies and the continuous downward price pressure from the domestic Tesla Model 3, the design cost of mass-produced vehicles can be continuously optimized by relying on VAVE management tools, the aim of which is to improve the comprehensive quality-price ratio of products, without making compromise to the product quality and customer perception. Practice shows that VAVE is a powerful tool to improve the product competitive of new energy vehicles. 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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Design and Modal Analysis of Automobile Instrument Panel Cross Car Beam GAO Weiwei Automobile Applied Technology    2023, 48 (8): 117-120.   DOI: 10.16638/j.cnki.1671-7988.2023.08.020 Abstract （99）      PDF （1516KB）（276）       This paper introduces some important parameters of structural design about cross car beam, such as material selection, beam main and auxiliary pipe beam and other installation support.For the vehicle in road test, considering the mode of the instrument panel beam in the design process, avoid the engine idle condition of the natural frequency and the instrument panel beam mode frequency similar resonance sound, through computer aided engineering (CAE) software analysis of a car instrument panel beam assembly module, and combined with relevant internal standards, the design beam to meet the design requirements, avoid the subsequent beam costs, designed to provide reference for the subsequent similar structure design. Reference | Related Articles | Metrics

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Analysis of Range-extended Electric Vehicle Dedicated Engine Technology WANG Jinyan Automobile Applied Technology    2022, 47 (6): 10-13.   DOI: 10.16638/j.cnki.1671-7988.2022.006.002 Abstract （217）      PDF （2125KB）（263）       With the global energy crisis and the pressure of carbon emissions, the research and development of energy-efficient vehicle in the automobile industry is imminent. The Range-extended electric vehicle is a series hybrid. In the extended range vehicle, the engine does not directly drive the vehicle, but only drives the generator to generate electricity. The engine speed and vehicle speed are completely decoupled. Therefore, the working point of the engine can be controlled in the area with higher combustion efficiency to achieve the energy saving and emission reduction of the vehicle. This paper analyzes the working characteristics of extended range engine, and summarizes the technical trend of extended range electric vehicle special engine through the techni- cal analysis of Nissan E-Power engine, which is a typical extended range model, so as to provide reference for the researchers of extended range engine products. 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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Analysis of Energy Flow Direction of Electric Vehicle and Research on Measures to Reduce Energy Consumption YU Fengzhu Automobile Applied Technology    2023, 48 (3): 20-27.   DOI: 10.16638/j.cnki.1671-7988.2023.03.004 Abstract （178）      PDF （1666KB）（213）       Energy flow analysis is an important analysis method of energy consumption of new energy vehicles. Through energy flow analysis, we can comprehensively understand the distribution of power consumption of vehicle models, quantitatively find the energy consumption difference between sample vehicles and benchmark vehicles, and determine the starting point for the most effective improvement of energy consumption level. In this paper, the energy consumption mechanism of the whole vehicle is analyzed theoretically, and the key control items of energy consumption are mined; automatic control realizes real-time collection and data processing of various energy related physical quantities, and serves as the final acceptance standard of energy consumption reduction measures. Based on the high-precision measured data, the energy flow simulation model of the whole vehicle is established and calibrated. On the one hand, it accurately locates the potential energy conservation direction, and on the other hand, it serves as the theoretical support for the early prediction of the project development, optimizing the powertrain framework, component selection and design parameters, and finding the solution most conducive to energy consumption. Reference | Related Articles | Metrics

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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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Research on Anti-seepage Water in the Cab of Heavy Truck in Winter YUE Dongdong Automobile Applied Technology    2021, 46 (17): 125-127.   DOI: 10.16638/j.cnki.1671-7988.2021.017.036 Abstract （36）      PDF （1500KB）（204）       The most basic function of the heavy truck cab is to ensure the safety of the passengers and provide a comfortable driving environment. In parts of northern China in winter, there will be condensation water in the cab after driving for a period of time. This paper starts with the cab structure, analyzes the way the external water source enters the cab and verifies it, puts forward waterproof optimization suggestions from the aspects of optimizing the sealing structure and assembly technology of the cab; analyzes the causes of condensation water inside the cab, and gives the calculation method of condensation water quantity; studies the different gold margins and insulation layer thickness. On the influence of the surface temperature of the cab, an optimization measure is proposed to raise the surface temperature of the cab to the temperature above the dew point of condensed water. Reference | Related Articles | Metrics

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Research on the Energy Management Strategy of Hybrid Electric Vehicles Based on ECMS-MPC HE Qi Automobile Applied Technology    2022, 47 (20): 19-22.   DOI: 10.16638/j.cnki.1671-7988.2022.020.005 Abstract （71）      PDF （1114KB）（194）       Under the background of energy conservation and emission reduction, energy management and control strategy is the key factor to determine the power, economy and emission of hybrid electric vehicles. In this paper, the mathematical model of the single axle parallel hybrid electric vehicle and its components is established based on MATLAB. On the basis of system modeling, an energy management strategy based on the minimum equivalent fuel consumption prediction model control (ECMS-MPC) is proposed and compared with the energy management and control strategy of dynamic programming (DP). Simulation results show that ECMS-MPC control strategy is close to DP energy management and control strategy in technical results. In terms of computing efficiency, ECMS-MPC control strategy is 6 times higher than DP energy management and control strategy. The superiority of ECMS-MPC control strategy is demonstrated. Reference | Related Articles | Metrics

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Vehicle-borne Network Communication System Based on Flexray Bus HUANG Xiaopeng Automobile Applied Technology    2022, 47 (2): 11-15.   DOI: 10.16638/j.cnki.1671-7988.2022.002.003 Abstract （70）      PDF （1251KB）（190）       With the automobile coming into an era of intelligence and electrification, the demand for vehicle-borne network technology is getting higher and higher. As the bus system of a new generation, FlexRay is applied more and more. This paper analyzes the advantages, topological structure and timeliness of Flexray vehicle-borne network system, moreover, it summarizes the specific application of Flexray vehicle-borne network system in vehicles, and explores the development trend of vehicle-borne network technology. 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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Three-electric Layout Strategy of Pure Electric Platform XU Han Automobile Applied Technology    2023, 48 (6): 1-4.   DOI: 10.16638/j.cnki.1671-7988.2023.06.001 Abstract （111）      PDF （2737KB）（178）       In order to make the vehicle have better driving range, better planning and layout of the interior space, but also with high safety and high intelligence, pure electric platform came into being. The layout strategy of the core part like motor, battery and motor controller of the pure electric platform has a significant impact on the properties of the platform. Starting from the development of a pure electric platform, this paper studies the influence of different three-electric layout strategies on space, collision safety, vehicle endurance, vehicle model expansion, etc. By choosing different three-electric layout strategies, the original pure electric platform can better fit the platform positioning, with stronger expansion, larger internal space and better performance, and provide detailed reference for the early strategy setting of the pure electric platform. Reference | Related Articles | Metrics

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Performance Simulation Analysis of Pure Electric Vehicle Air Conditioning Control System TANG Jinxiang Automobile Applied Technology    2023, 48 (4): 1-4.   DOI: 10.16638/j.cnki.1671-7988.2023.04.001 Abstract （95）      PDF （534KB）（172）       The air conditioning system of pure electric vehicle is a nonlinear and time-varying system, so it is not easy to get the mathematical model of the system. The conventional proportion integration differentiation (PID) control strategy is not effective, so this paper conducts simulation research on the air conditioning system of pure electric vehicle using fuzzy control strategy. Firstly, the heat load of summer car compartment is calculated, and the mathematical model of the system is established in Simulink under Matlab software. Then the Fuzzy Logic Controller module of the system is designed in Simulink. Finally, variable parameter simulation is carried out on the whole system. By changing the number of passengers in the cabin, the speed of the vehicle, the temperature outside the vehicle and the temperature inside the vehicle, simulation research is carried out. The results show that the temperature inside the air conditioning system of pure electric vehicle with fuzzy control strategy reaches the set temperature in a short time and the fluctuation is not large. In line with the performance requirements of pure electric vehicle air conditioning on response time, overshot, variable load capacity, compared with the traditional PID strategy control effect is better. 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 （556）      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