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30 April 2023, Volume 48 Issue 8 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Use and Maintenance
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Research Review on Thermal Management of New Energy Vehicles MA Haoran 2023, 48(8): 1-9.  DOI: 10.16638/j.cnki.1671-7988.2023.08.001 Abstract ( )   PDF (3142KB) ( )   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. References | Related Articles | Metrics

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Research on Lateral Control of Vehicles Based on Conventional Power Assist and Active Steering WANG Guilin 2023, 48(8): 10-16.  DOI: 10.16638/j.cnki.1671-7988.2023.08.002 Abstract ( )   PDF (925KB) ( )   This paper describes the application of electric power steering (EPS) system in new energy vehicles, and discusses the implementation of lane keeping assist (LKA) System in the automatic driving system of new energy vehicles. Firstly, a model is established for a brand of electric passenger car EPS, and a conventional assist control mode based on upper-level linear assist control and lower-level fuzzy proportion integral differentia (PID) control is developed; then, a two degree-of-freedom vehicle model and a vehicle-road error model are established, and a control strategy based on linear quadratic regulator (LQR) is developed, which is based on the vehicle state. The LKA is interacted with the EPS through the angle to realize the active front wheel turn control of the vehicle. Finally, MATLAB/Simulink and CarSim joint simulation platform is used for simulation and validation. The simulation results show that the developed control strategy can accurately realize the function of conventional power assist and LKA active steering of new energy vehicles, which can greatly improve the driving safety of vehicles. References | Related Articles | Metrics

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Optimization Research of Thermal Performance of Double Micro-channel Heat Sink for Pure Electric Vehicle ZHANG Yongdong 2023, 48(8): 17-21.  DOI: 10.16638/j.cnki.1671-7988.2023.08.003 Abstract ( )   PDF (798KB) ( )   With the rapid improvement of the performance of pure electric vehicle chips, the lack of heat dissipation has become the bottleneck of the development of electronic technology. When the heat flux density exceeds 100 W/cm 2 , the traditional air cooling technology can not meet the heat dissipation demand. The double micro-channel heat sink is considered to be one of the best methods to improve the heat dissipation performance because of its large heat transfer area to volume ratio. In this paper, the optimization of the double micro-channel heat sink is carried out by using the response surface methodology in the field of pure electric vehicle chip heat dissipation. The results show that the optimized double micro-channel heat sink has better overall heat dissipation performance. Compared with the original size of the double micro-channel heat sink, the thermal resistance is reduced by 4.23% and 9.42% respectively. References | Related Articles | Metrics

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Simulation Analysis on Adaptive PI Control of Permanent Magnet Synchronous Motors for Electric Vehicles LI Jiaxuan 2023, 48(8): 22-26.  DOI: 10.16638/j.cnki.1671-7988.2023.08.004 Abstract ( )   PDF (886KB) ( )   In order to improve the response speed of the permanent magnet synchronous motor vector control system and improve the robustness of the system, this paper uses an adaptive proportional integral (PI) vector control strategy to improve the traditional vector control strategy. According to the relevant parameters of a permanent magnet synchronous motor for a hybrid electric vehicle, the paper establishes a motor model and a traditional vector control simulation model; designs an adaptive PI controller based on BP neural network, improves traditional vector control simulation model. Finally, the simulation comparison and analysis of the two control system are carried out under torque sudden change conditions. The results show that: compared with the traditional vector control strategy, the designed adaptive PI vector control strategy based on BP neural network can effectively improve the response speed of the system, enhance the robustness of the control system, and meet the requirements of vehicle motors. References | Related Articles | Metrics

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Reliability Analysis of New Energy Vehicle Drive Motor Based on Weibull Distribution WANG Daocheng 2023, 48(8): 27-31.  DOI: 10.16638/j.cnki.1671-7988.2023.08.005 Abstract ( )   PDF (745KB) ( )   To further improve the reliability analysis level of drive motor fault time data of new energy vehicle, a reliability analysis method based on Weibull distribution is proposed. In this paper, based on the complete fault data of small sample size, the reliability analysis process is summarized, and the empirical distribution function calculation model, three-parameter Weibull distribution model and grey model GM (1,1) are introduced and theoretically deduced. Finally, the fault data of a certain type of drive motor test is analyzed. The reliability analysis results show that the three-parameter Weibull distribution model based on the grey model GM (1,1) has a good fitting effect, and the average life of the drive motor of this batch model is 1 185.005 7 h. This paper provides a more accurate reliability analysis method, and the relevant reliability analysis results can further support the maintenance of the drive motor. References | Related Articles | Metrics

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Noise and Vibration Control Method of Pure Electric Vehicles Subsystem Based on Fixed Conditions DUAN Dehu 2023, 48(8): 32-38.  DOI: 10.16638/j.cnki.1671-7988.2023.08.006 Abstract ( )   PDF (1218KB) ( )   In order to adjust the noise and vibration of the pure electric vehicle subsystem under fixed working conditions, a systematic control method for the noise and vibration of the subsystem in the vehicle is proposed through the test data and subjective evaluation matrix. Firstly, set a reasonable target value of the blower subsystem, and calibrate the speed of the blower subsystem that meets the target noise, and then the frequency sweep test of the electronic fan and compressor is carried out by the method of controlling variables to determine the vibration and noise curves that change with the hammer steering system and compressor body mode distribution, comprehensive test data output objective frequency avoidance matrix, and secondly, according to the objective frequency avoidance matrix combined with the masking effect of sound, the matrix subjective evaluation of the subsystem is carried out to obtain the matrix result, and finally the temperature difference in the car is taken as the connecting variable, and the speed control table of the subsystem is combined with the air conditioning performance requirements. From the perspective of system control, this method comprehensively controls the influence of subsystems on interior noise, while avoiding the influence of objective physical structure, which can be applied to different models and has high reproducibility and reference. References | Related Articles | Metrics

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Research on Path Optimization of Electric Driverless Distribution Freight Vehicle WEN Xinqi 2023, 48(8): 39-45.  DOI: 10.16638/j.cnki.1671-7988.2023.08.007 Abstract ( )   PDF (1392KB) ( )   With the development of driverless technology, the combination of driverless technology and electric vehicles with extensive advantages is the development trend in the future. However, due to the imperfect development of battery and charging technology of electric vehicles, the rated driving range of driverless electric logistics vehicles is generally not high, and the actual driving range is less than the rated driving range. Therefore, it is necessary to study the path optimization problem. In this study, a mathematical model of the route optimization problem of driverless electric logistics vehicle is proposed, and the rationality of the model is verified by using LINGO software to test a small scale example. Then, the traditional C-W algorithm is improved, and it is used to solve the mathematical model in this paper. MATLAB software is used to solve the small-scale example to verify the feasibility of the algorithm. Finally, a large scale example is solved by the improved algorithm. The experimental results show that the mathematical model of vehicle routing optimization problem with electricity constraints is reasonable, and the feasibility and rationality of the improved C-W algorithm with electricity constraints are proved. References | Related Articles | Metrics

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Shift Force Control of Electric Vehicle AMT Based on the Linear Quadratic Optimization Algorithm GU Zhipeng 2023, 48(8): 46-52.  DOI: 10.16638/j.cnki.1671-7988.2023.08.008 Abstract ( )   PDF (1096KB) ( )   To improve the shift smoothness of two gear automated mechanical transmission (AMT) of a pure electric vehicle, a detailed dynamic analysis of the shifting process of a two gear AMT without a clutch of an electric car is carried out, the linear quadratic regulator (LQR) optimal control algorithm is used to determine the optimal shift force in the synchronization stage, and the shift bench test is carried out. The test results show that under the premise of a small increase in shift time, and the peak value of transmission output shaft speed fluctuation is 48.4% lower than that without optimization, and the shift force optimal control based on LQR can effectively reduce the shift impact and improve the shift quality. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Steering-by-wire Sliding Mode Control Based on Variable Exponential Approach FU Xu 2023, 48(8): 53-58.  DOI: 10.16638/j.cnki.1671-7988.2023.08.009 Abstract ( )   PDF (1162KB) ( )   In order to improve the accuracy of the nonlinear response of the angular transmission ratio of the steer-by-wire vehicle at high speed, the objective function of steer-by-wire were analyzed, and the calculation process of variable transmission ratio was deduced. The effects of constant yaw velocity gain, constant lateral acceleration gain, vehicle speed and steering wheel input on the mapping results of front wheel angle were discussed, and the variable transmission ratio strategy based on fuzzy inference system was established. Aiming at the deficiency of ideal transmission ratio in vehicle stability control, the method of front wheel compensation angle is used to make the final decision of front wheel angle. In the verification process, the vehicle mathematical model of steer by-wire was built, typical steering input conditions were selected, and the overall system design was co-simulated and compared with the dynamic simulation software. Experimental results show that the designed transmission ratio strategy can meet the requirements of steering wheel indicators,reduce yaw speed and centroid sideshow angle, and effectively reduce the operating burden of the driver. The active steering strategy based on improved sliding mode control reduces overshoot by 9% compared with saturation function exponential reaching law sliding mode control, which improves vehicle driving safety. References | Related Articles | Metrics

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Application and Key Technology of Vehicle Positioning System CAI Zhijun 2023, 48(8): 59-64.  DOI: 10.16638/j.cnki.1671-7988.2023.08.010 Abstract ( )   PDF (934KB) ( )   With the development and popularization of the application of Internet of vehicles and autonomous driving, the importance of vehicle positioning systems is becoming more and more important. Based on the principle and architecture of the vehicle positioning system, this paper focuses on the principle and application of the key technologies of vehicle high-precision positioning, including traditional satellite navigation, differential positioning, inertial navigation and combined navigation with their combination schemes, and finally, the development of vehicle positioning system is also discussed and summarized. In order to meet the needs and challenges brought by scenarios related to autonomous driving, the vehicle positioning system has gradually added differential positioning, inertial navigation system and the combination of these two for coupling navigation on the basis of the original global navigation satellite system (GNSS) positioning, which further strengthens the anti-interference capability and dynamic adaptation capability of vehicle positioning with obscured environment while improving the positioning accuracy. References | Related Articles | Metrics

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Analysis of Trajectory Tracking Control of Automatic Parking System Based on MPC LI Shihao 2023, 48(8): 65-69.  DOI: 10.16638/j.cnki.1671-7988.2023.08.011 Abstract ( )   PDF (1102KB) ( )   With the improvement of the living standards of Chinese people, the popularity of motor vehicles continues to increase, and with the increase in the number of vehicles, traffic congestion, frequent accidents and other problems are becoming more and more serious, for passenger car drivers with immature driving ability, it is more likely to cause traffic accidents due to improper parking, so automatic parking has become an urgent need to develop technology. The main research content of this paper is the control algorithm of automatic parking system trajectory tracking, which adopts the vertical parking environment, uses the model predictive control (MPC) algorithm for path tracking according to the feasible path that has been planned, and increases the control amount increment in the cost function to achieve the accuracy and stability of the trajectory tracking process. In order to verify the control effect, the Carsim-Simulink joint simulation platform is built, and the results show that the MPC control algorithm can achieve good trajectory tracking effect when parking. References | Related Articles | Metrics

Design and Research

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Study on the Low-carbon Transportation Path in Tibet Autonomous Region —Taking Lhasa as an Example WANG Jingxiao 2023, 48(8): 70-75.  DOI: 10.16638/j.cnki.1671-7988.2023.08.012 Abstract ( )   PDF (1086KB) ( )   In recent years, the Tibet autonomous region has stepped up its efforts in green, low-carbon and circular development. The purpose of this paper is to study the path of low-carbon transport in Lhasa on the basis of systematic study of the current general urban low-carbon transport policy system, using empirical research method and kaya model, reasonable calculation of traffic carbon emissions data in Lhasa. The results show that the total carbon emission of transportation industry in Lhasa is increasing year by year with the economic growth, which shows that traffic carbon emission is closely related to the economy, and freight transportation accounts for the largest proportion of traffic carbon emission, which is increasing year by year. On this basis, combining with the geographical advantages and environmental advantages of Lhasa, this paper scientifically designs the path and framework of low-carbon transportation in Lhasa, aiming at alleviating the greenhouse effect to a certain extent and accelerating the change of citizens' travel mode. References | Related Articles | Metrics

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Mechanical Characteristics and Fatigue Analysis of Self-adjusting Diaphragm Spring Clutch LI Jianying 2023, 48(8): 76-84.  DOI: 10.16638/j.cnki.1671-7988.2023.08.013 Abstract ( )   PDF (8646KB) ( )   Taking a self-adjusted diaphragm spring clutch as a research object, the finite element model is established, on which the static, modal, transient dynamics and fatigue of the diaphragm spring, force sensing spring, clutch cover and pressure plate are analyzed. Through static analysis, their design is safe; through modal analysis, their natural frequency and vibration model are obtained and the theoretical guidance is provided to avoid resonance; through transient dynamics analysis, the dynamics characteristics of each member are obtained, indicating its working characteristics are expected; the maximum stress value and maximum stress point position is obtained by fatigue analysis, and the optimization direction for the clutch structure design is provided. The results of this paper can provide theoretical basis for structural design and optimization of self-adjusted diaphragm spring clutch. References | Related Articles | Metrics

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Crashworthiness Analysis and Multi-objective Optimization Design of Automobile Front Longitudinal Beam Structure WANG Ting 2023, 48(8): 85-90.  DOI: 10.16638/j.cnki.1671-7988.2023.08.014 Abstract ( )   PDF (2738KB) ( )   In order to improve the crashworthiness and lightweight level of automobile front rail structure, multi-objective optimization design is carried out in this paper. Based on the dynamic drop hammer impact test, the accuracy of the finite element model of the front rail and the reliability of the modeling method are established and verified. Combined with experimental design, particle swarm optimization (PSO) algorithm improved support vector regression (SVR) model and non-dominated sorting genetic algorithm Ⅱ (NSGA-Ⅱ), In order to reduce the weight of the front rail and increase its specific absorption energy, the deterministic optimization and reliability optimization of the front rail were carried out. The results show that the crashworthiness and lightweight level of the optimized front rail structure are improved, and the reliability of the design is also guaranteed. References | Related Articles | Metrics

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Analysis of Vibration and Noise of Transmission of Pure Electric Construction Machinery WANG Fujun 2023, 48(8): 91-96.  DOI: 10.16638/j.cnki.1671-7988.2023.08.015 Abstract ( )   PDF (1554KB) ( )   Aiming at the transmission development project of a pure electric construction machinery, the dynamic model of the transmission system of the gearbox gear is established in MASTA, and the vibration and noise caused by the transmission error of the gearbox gear are studied. The influence of the flexibility of the gearbox shell, shaft and gear spokes on the transmission error is explored by using the full finite element mesh technology, and the transmission error of the gear is reduced and the contact state of the tooth surface is improved through micro modification, The vibration response of the transmission is reduced. The results show that the vibration response of the transmission can be significantly reduced and the noise, vibration, harshness (NVH) performance of the transmission can be improved by appropriately increasing the micro modification parameters of the gear teeth. It provides a basis for controlling the vibration response of the gearbox at the initial stage of design, and provides a solution to the abnormal sound of the whole vehicle at the later stage, which has strong engineering applicability. References | Related Articles | Metrics

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Analysis of Catalytic Efficiency of Two-stage Catalyst for Natural Gas Engine YUAN Zhihong 2023, 48(8): 97-100.  DOI: 10.16638/j.cnki.1671-7988.2023.08.016 Abstract ( )   PDF (1168KB) ( )   China Ⅵ vehicle emission standard natural gas engine adopts a three-way catalytic converter. There are oxidation and reduction reactions in the three-way catalytic converter, which can improve the durability of the aftertreatment. The study found that the activity of the active agent and the reaction efficiency of the pollutants at different temperatures are quite different. This paper summarizes the characteristics of the pollutants emitted by natural gas heavy-duty trucks, and analyzes and discusses the catalytic converter scheme to improve the conversion efficiency of the pollutants. Natural gas vehicle catalytic converters using three-way catalytic converters have two technical solutions: one-level and two-level. By analyzing the layout of the catalytic converter and the exhaust temperature after the supercharger, catalyst activity, and conversion efficiency of exhaust pollutants, it is determined that the two-stage catalytic converter technical solution for natural gas vehicles can improve the catalytic efficiency of the catalytic converter. References | Related Articles | Metrics

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NOx Prediction of Diesel Engine Based on Random Forest and Optimized GRU Algorithm GUO Zhigang 2023, 48(8): 101-106.  DOI: 10.16638/j.cnki.1671-7988.2023.08.017 Abstract ( )   PDF (1319KB) ( )   Selective catalytic reduction (SCR) technology with urea as reducing agent is the main way to reduce NOx emissions of diesel vehicles, and accurate prediction of NOx is the premise to achieve accurate control of SCR. In this paper, a method of random forest combined with gate recurrent unit (GRU) is proposed to predict NOx. In view of the complexity of NOx generation factors, random forest is used to select features that have a large impact on the results, and the NOx prediction model based on gate unit is constructed. The experimental results show that the mean square error of the prediction results using random forest combined with GRU under transient and steady-state conditions is 66.419×10-6 and 63.423×10-6 , which proves that the model has high accuracy and good generalization ability. References | Related Articles | Metrics

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Active Noise Reduction Identification Method of Engine Noise in Vehicle and DSP Implementation ZHANG Chengpeng 2023, 48(8): 107-112.  DOI: 10.16638/j.cnki.1671-7988.2023.08.018 Abstract ( )   PDF (1820KB) ( )   Active noise reduction technology has obvious advantages in low-frequency noise control. It uses the speakers in the car to cancel the sound waves to achieve noise reduction. In this paper, the frequency sweep method is used to carry out the calibration process of active noise reduction, and the controller and the original car line matching are realized on a four-cylinder engine model, and the original car audio is used to build the in-car engine active noise reduction system. Using MATLAB to build a simulation model to verify the adaptive notch algorithm, derive the sound transfer function formula in the car, and derive the identification results. From the engineering point of view, the matching method of the controller and the vehicle interface is introduced. Finally, digital signal processing (DSP) technology is used to verify the real vehicle effect, the second, fourth, and sixth-order noise of the engine is reduced under the acceleration condition of locking the second gear, and the sound pressure level overall (OA) value of 30～300 Hz is reduced by 4 dB at the maximum. References | Related Articles | Metrics

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Denting Resistance Analysis and Optimization of the Door Outer Panel of a Passenger Car Based on HyperMesh MA Jiajia 2023, 48(8): 113-116.  DOI: 10.16638/j.cnki.1671-7988.2023.08.019 Abstract ( )   PDF (1314KB) ( )   Denting resistance performance of the door outer panel is one of the important evaluation indexes of the body, the lack of its performance will reduce the quality of the products, and effect the subjective feelings of customers. In order to solve this problem, In this paper, the denting resistance performance of the door outer panel was simulated based HyperMesh, the unqualified pressure point was optimized by changing the structure stiffening plate and adding reinforcing sheet, and through the test to verify this optimized scheme. The experimental results show that the simulation is effective, and it provides a reliable basis for optimizing the structure of the door out panel. References | Related Articles | Metrics

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Design and Modal Analysis of Automobile Instrument Panel Cross Car Beam GAO Weiwei 2023, 48(8): 117-120.  DOI: 10.16638/j.cnki.1671-7988.2023.08.020 Abstract ( )   PDF (1516KB) ( )   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. References | Related Articles | Metrics

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Optimization of Vehicle Crash Compatibility Index Based on MPDB Conditions XING Zhiyuan 2023, 48(8): 121-125.  DOI: 10.16638/j.cnki.1671-7988.2023.08.021 Abstract ( )   PDF (4160KB) ( )   In the 2021 version of the China-new car assessment programme (C-NCAP) evaluation charter, the frontal 50% overlapped moving progressively deformable barrier (MPDB) crash test replaced the original frontal 40% overlapped deformable barrier (ODB) crash test, and was proposed for the first time the requirements for the assessment of vehicle crash compatibility indicators have been met. In order to ensure that the vehicle crash compatibility index meets the requirements in the detailed design stage, it is necessary to carry out a crash compatibility optimization analysis on the vehicle. In this paper, the finite element crash simulation modeling and MPDB working condition analysis of a medium-sized sport utility vehicle (SUV) are firstly carried out, and a crash compatibility optimization scheme is proposed, and finally the computer aided engineering (CAE) comparison and verification are carried out. The results show that by increasing the effective contact area between the front end of the vehicle and the barrier and matching the body stiffness, the compatibility penalty of the whole vehicle can be greatly reduced, and it also provides a reference for the design and development of subsequent new cars. References | Related Articles | Metrics

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Analysis on Automatic Locking of Tailgate Based on Energy Conervation ZHANG Wei 2023, 48(8): 126-130.  DOI: 10.16638/j.cnki.1671-7988.2023.08.022 Abstract ( )   PDF (1116KB) ( )   In order to study how to realize the automatic locking of the tailgate of the automobile, the paper first analyzes the influencing factors of realizing the automatic locking of the tailgate, then establishes a mathematical calculation model for each factor, calculates the energy generated or consumed by each influencing factor in the process of closing the tailgate, and finally according to the law of energy conservation, the energy required to obtain the automatic locking of the tailgate is calculated, and according to the calculation structure, it is judged whether the tailgate can be automatically locked. Through the above method, various parameters can be adjusted in the preliminary design to satisfy the automatic lock of the tailgate of the automobile. References | Related Articles | Metrics

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Reliability Design of Power Supply System of Communication Vehicle YANG Yang 2023, 48(8): 131-136.  DOI: 10.16638/j.cnki.1671-7988.2023.08.023 Abstract ( )   PDF (1445KB) ( )   The power supply system of communication vehicle is the key to the safe and effective operation of communication vehicle in normal and extreme environment, to successfully complete all kinds of communication tasks, and to ensure the vitality of the vehicle. How to carry out reasonable and effective reliability design of the communication vehicle power supply system, to make the communication vehicle can stably realize the functions of various tasks and to ensure the stability and reliability of the vehicle power supply system, has become an important link and technical difficulties in the design of the vehicle power supply system. Based on the composition and working principle of the power supply system of communication vehicle, the reliability model of the power supply system and its units is established in this paper. The expert scoring method is used to reasonably allocate the reliability indexes, so that the mean time between failure of each unit of the power supply system is more in line with the actual requirements of the power supply system reliability. At the same time, according to the reliability of power supply system model, the failure mode effects analysis is carried out, the weak links of the power supply system is identified, and the reliability design (including the fault-tolerant design, process design, components quality control, margin design, environmental design, etc.) is made, in order to reduce the failure rate of the communication vehicle power supply system, eliminate the potential problems in the system, improve the reliability of power supply system of communication vehicle. References | Related Articles | Metrics

Testing and Experiment

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Calculation and Verification Test of Torsional Stiffness of One-way Clutch JIANG Cuicui, 2023, 48(8): 137-140.  DOI: 10.16638/j.cnki.1671-7988.2023.08.024 Abstract ( )   PDF (1329KB) ( )   In order to improve the traditional manufacturing, completely by the test of long cycle and high cost defects, through the dynamic transmission test bench, layout torque sensor input shaft acquisition one-way clutch after the angle of pulse signal phase difference, calculate the torsion stiffness, while establishing the dynamic transmission simulation model, calculate the stiffness of the outer ring, roller and inner star wheel. The comparative simulation and test results show that the calculation method of clutch torsional stiffness described in the paper corresponds to the order of magnitude of the experimental value, which proves that the calculation method of clutch torsional stiffness can meet the engineering requirements. References | Related Articles | Metrics

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Piecewise Linearization Considering the Nonlinear Characteristics of Tires ZHANG Wenjing 2023, 48(8): 141-145.  DOI: 10.16638/j.cnki.1671-7988.2023.08.025 Abstract ( )   PDF (1359KB) ( )   In the study of the handling stability of the four-wheel steering vehicle, it is difficult to deal with the nonlinear model of the tire directly by using the linear control theory. In order to solve this problem, this paper proposes to establish a piecewise linear model of the tire according to the cornering characteristics of the tire, and uses MATLAB to simulate and compare the cornering characteristics of the piecewise linear rear tire model with the tire cornering characteristics of the "magic formula" tire model. It shows that the cornering characteristic curves of the piecewise linearized tire model and the magic "magic formula" tire model are consistent with each other. It is further shows that the model can easily obtain the cornering stiffness of the tire through linear processing and can be applied to the study of the steering stability of the four-wheel steering vehicle. References | Related Articles | Metrics

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Analysis of the Influence of Tailgate Restraint Mode on the Acceleration Booming of a Vehicle LI Feng 2023, 48(8): 146-151.  DOI: 10.16638/j.cnki.1671-7988.2023.08.026 Abstract ( )   PDF (2752KB) ( )   A sport utility vehicle (SUV) tooling sample vehicle driving on a smooth asphalt road, there is serious acceleration booming of the driver's inner ear in the subjective evaluation when the engine speed is 2 700 r/min under the condition of third gear wide open throttle. There is a peak value in the sound pressure response curve under this condition is showed in the test results, and the second-order response is dominant. There is a corresponding peak value at 2 730 r/min in the whole vehicle acceleration simulation analysis. Through the analysis of transmission path and modal contribution, it is determined that the coupling of the middle snap mode of the tailgate and the second-order mode of the body cavity was the main reason for the acceleration booming. The tailgate mode is improved to avoid frequency with the acoustic cavity mode. The tailgate mode is the single constrained mode and the installation state of the full vehicle. Firstly, the single constrained mode is improved to find the optimization scheme, and then it is verified in the vehicle state to determine the effective and reasonable scheme. Finally, the booming peak value is reduced by 3～4 dB through the real vehicle test, meeting the established target line requirements, and the subjective evaluation is accepted. The idea of using the constrained modal optimization of the tailgate subsystem to solve the acceleration booming of the full vehicle had a certain reference significance for similar real vehicle problems. References | Related Articles | Metrics

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Analysis on the Effect of Silent Tire with Tire Repair Reagent on Cavity Noise MO Longgen 2023, 48(8): 152-157.  DOI: 10.16638/j.cnki.1671-7988.2023.08.027 Abstract ( )   PDF (2407KB) ( )   While the rise of electric vehicles, silent tires and tire repair agent are also becoming more common, however, for the compatibility of silent tires and tire repair agent, which need to conduct in-depth research on it. First of all, monitored the air tightness of the punctured tires repaired by the tire repair agent, and found that the tire don't leak, indicating that the silent tires does not affect the function of tire repair agent to repair tire. In addition, designed four test schemes, and tested the decibel value of cavity noise of the tires with different schemes by comparison method. It was found that the cavity noise value of tires with tire repair agent did not significantly deteriorate, indicating that the use of tire repair agent does not affect the function of silent tires to optimize cavity noise. So silent tires and tire repair agent compatibility is good, the two do not affect each other's function. References | Related Articles | Metrics

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Analysis of the Influence of A Runaway Tire on An Electric Vehicle WANG Yongwei 2023, 48(8): 158-161.  DOI: 10.16638/j.cnki.1671-7988.2023.08.028 Abstract ( )   PDF (2094KB) ( )   In this paper, the influence of oil to electric vehicle tire on rapid acceleration and deviation is studied, and the change of electric vehicle on the basis of fuel vehicle is analyzed. The electric vehicle motor output torque is large, the response is fast, and the acceleration and deviation will occur in the process of 0～80 km/h rapid acceleration. In order to solve this problem, the replacement of different brands of tires to verify the deviation, one of the tires does not run off, through the six component force tester test two brands of tires under rapid acceleration tire load and driving force relationship, statistical tire deviation, analysis of tire adhesion stability has an impact on acceleration deviation. The influence of tire adhesion coefficient and tire linear driving stability on sharp acceleration deflection was determined. References | Related Articles | Metrics

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Gear Fault Diagnosis Based on Vibration Time-domain Data MA Hongtao 2023, 48(8): 162-165.  DOI: 10.16638/j.cnki.1671-7988.2023.08.029 Abstract ( )   PDF (1265KB) ( )   Spiral bevel gear is the key component of drive axle drive chain, and also the end core component of automobile transmission system. In the driving bridge type test, the gear fatigue test plays a dominant role. In the early stage, due to the lack of fault diagnosis equipment, most gear fatigue tests were stopped after the complete loss of transmission capacity. Accordingly, the gear teeth of spiral bevel gears were seriously damaged, which made it impossible to determine the fatigue source and cause. Therefore, it is difficult to formulate an effective design optimization scheme, which leads to repeated design verification work and climbing of development cycle and cost. In this paper, the mechanical fault diagnosis principle is introduced into the fatigue test of the drive axle gear. Combining the meshing principle of the spiral bevel gear and the transfer function characteristics of the axle housing, the gear fault online diagnosis system for the drive axle is developed independently. The system uses autocorrelation and time-domain synchronous average processing algorithms to successfully extract and identify gear fault impact signals. Through early warning and active shutdown, it greatly facilitates the analysis of gear fatigue causes and improves the development efficiency of drive axle. In addition, with the development of automobile intelligence, the drive axle fault diagnosis system can provide a firm theoretical and practical basis for driverless driving. References | Related Articles | Metrics

Process and Equipment

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Application of VRB Technology in Lightweight Body LIU Jiangbo 2023, 48(8): 166-169.  DOI: 10.16638/j.cnki.1671-7988.2023.08.030 Abstract ( )   PDF (1826KB) ( )   Lightweight is a major issue facing the automobile industry today. How to achieve lightweight while ensuring crash performance is a common problem and challenge facing all major OAs. In order to achieve the goal of lightweight body while ensuring collision performance, this paper based on a certain high-end new energy vehicle, through the application of variable-thickness rolled blank (VRB) technology in B-pillar instead of the original B-pillar reinforced plate welding scheme, combined with collision simulation analysis technology, finally achieve the lightweight effect of 10% weight reduction while meeting the collision performance of this high-end new energy vehicle. The application of the scheme has a certain reference function for the industry. References | Related Articles | Metrics

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The Analysis Causes and Improvement Measures of the Poor Topcoat Quality on the Car Panels LI Chunyan 2023, 48(8): 170-173.  DOI: 10.16638/j.cnki.1671-7988.2023.08.031 Abstract ( )   PDF (1613KB) ( )   In the trial production of the new car, the topcoat quality of the front and rear exterior panels are poor, mainly showing orange peel defects. In order to solve the orange peel defects before the mass production of the car, through the investigation of the key parameters of the topcoat and the process parameters of other proceduces, it is determined that the main influencing factors of orange peel defects are the surface appearance of the steel plate, painting materials and coating processes. After the optimization and the verification, the coating defects of orange peel on front and rear door panels are improved after the roughness of the steel plate is reduced from 1.264 μm to 0.8～1.0 μm, the varnish is changed from 1 K to 2 K, the varnish spraying flow is increased by 10%～15% and the chain speed is reduced by 6.4%. References | Related Articles | Metrics

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Lightweight Design and Finite Element Analysis of Rear Drive Axle Housing of a Twin-tire Light Truck CHEN Guanxu 2023, 48(8): 174-177.  DOI: 10.16638/j.cnki.1671-7988.2023.08.032 Abstract ( )   PDF (1861KB) ( )   Automobile lightweight design is based on ensuring the performance of the whole vehicle, the design of the vehicle maintenance quality for energy saving. The strength and rigidity of the drive axle have a direct impact on the safety and reliability of the vehicle. There are more clear requirements on the bearing quality and service life of the truck. this paper analyzes and demonstrates the fatigue durability of the whole axle housing based on ABAQUS analysis on the premise of ensuring the strength and safety performance of the light truck. The final 85 mm×85 mm× 6 mm square tube steel plate integral blanking welding axle, which is made of high strength steel QSTE460TM for the upper and lower parts. Under various working conditions, it is satisfied with the strength and rigidity of the axle. The analysis results indicate that the lightweight design of the drive axle is feasible. References | Related Articles | Metrics

Use and Maintenance

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Case Analysis of Volkswagen Magotan B8 Engine Failure to Start GUO Shun 2023, 48(8): 178-182.  DOI: 10.16638/j.cnki.1671-7988.2023.08.033 Abstract ( )   PDF (1238KB) ( )   Taking Magotan B8 engine as an example, this paper introduces the failure cases of engine and failure to start the starter, lists the corresponding fault points according to the engine starting control principle, and explains the troubleshooting methods and diagnostic ideas of different faults in the starting control system combined with the failure cases. In fault diagnosis, the diagnostic idea mainly includes describing the fault phenomenon and characteristics, analyzing the possible causes according to the phenomenon and related fault codes, data measurement and result analysis, and further confirming the fault point and mechanism analysis. In the whole process of fault diagnosis, rigorous diagnostic thinking is particularly important, which is also relatively high requirements for technical personnel, who need to master the control logic of the system. A rigorous train of thought for automobile fault diagnosis is established through fault analysis, which provides a reference train of thought and method for automobile maintenance technicians in automobile fault diagnosis. References | Related Articles | Metrics

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Fault Analysis on Idling Jitter of Magotan B8L Engine LIU Dan 2023, 48(8): 183-186.  DOI: 10.16638/j.cnki.1671-7988.2023.08.034 Abstract ( )   PDF (1756KB) ( )   Through the analysis of the failure phenomenon of the idling jitter of the Magotan B8L car, combined with engine system control logic and the auxiliary test of automobile special equipment, the fault diagnosis and elimination of engine idling jitter was completed finally. The faults involve the engine ignition system, intake system and fuel injection system, which are comprehensive and representative. During analysis and diagnosis, the basic idea of engine system fault diagnosis and its control logic was demonstrated and it has certain reference value for teachers and students of vocational colleges and maintenance personnel. At the same time, fault diagnosis ideas and the analysis of fault mechanism have certain reference significance for other aspects of engine fault maintenance. References | Related Articles | Metrics

Automobile Education

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Design and Development Practice of a Simulative Training Platform for Heavy Commercial Vehicle Pneumatic Braking System for Teaching Use PEI Jiazhi 2023, 48(8): 187-191.  DOI: 10.16638/j.cnki.1671-7988.2023.08.035 Abstract ( )   PDF (1186KB) ( )   With the rapid development of China's commercial vehicle industry, the social demand for commercial vehicles maintenance talents is increasing. It is urgent for vocational colleges to cultivate more high-quality students in related fields, but the shortage of training equipment has become an important restricting factor. Based on this, this project has designed a set of training platform for heavy commercial vehicles pneumatic braking system, which has the characteristics of high simulation degree, strong practicality, low production cost, and is suitable for the major of automobile maintenance in vocational colleges. Besides, based on the training platform, a series of utilization strategies are put forward to promote the integrated teaching reform in vocational colleges, so as to improve the teaching quality. References | Related Articles | Metrics

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Curriculum Ideological and Political Thinking and Practice of Postgraduate Professional Courses —Takes the Course of Vehicle Crash Safety Technology as an Example HAO Qi 2023, 48(8): 192-195.  DOI: 10.16638/j.cnki.1671-7988.2023.08.036 Abstract ( )   PDF (1226KB) ( )   The transformation and development of the automobile industry not only brings the requirements of technology integration and industrial innovation to the graduate education of vehicle engineering major, but also provides more curriculum ideological and political materials for professional courses which expands the depth and breadth of ideological and political courses in professional courses. According to the characteristics of graduate learning, the ideological and political objectives of automobile crash safety technology curse are condensed combined with case teaching methods, the seamless connection between ideological and political and knowledge points is formed. With the applying of the varied teaching methods, the values leading is be put throughout the course, so as to improve the quality of graduate talent training. References | Related Articles | Metrics

Standards Regulations Management

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Quality Wages Program in a Company's Operation Experience YIN Yane 2023, 48(8): 196-200.  DOI: 10.16638/j.cnki.1671-7988.2023.08.037 Abstract ( )   PDF (1183KB) ( )   Through effective quality control measures, the quality indicators of a certain company's physical products are decomposed and implemented layer by layer, and are effectively integrated with unit and individual salaries to form a quality salary. The monthly quality salary is publicly displayed through the company's office automation platform, making everyone pay attention to quality and thus improving physical product quality. In addition, with the use of case studies and data comparisons since the trial runs of the quality salary program, the positive effects of the program on improving product quality are demonstrated, providing a feasible solution for the company to enhance physical product quality. Hope to provide a reference for similar companies to improve their physical product quality. References | Related Articles | Metrics

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Discussion on Control Strategy Based on Automobile Product Research and Development Data CHANG Yongbin 2023, 48(8): 201-206.  DOI: 10.16638/j.cnki.1671-7988.2023.08.038 Abstract ( )   PDF (1212KB) ( )   In the face of increasingly fierce market competition, how to develop high quality products with high efficiency and low cost has become the key to the survival of enterprises. Automobile product research and development data is based on the enterprise research and development, supply, sales and after-sales service needs, produced in the process of product research and development of various parts status, bill of materials, technical documents, design changes and other data, is the vehicle technical parameters, parts status to meet the design objectives of the physical embodiment. Automobile product research and development data management mode determines whether the upstream and downstream activities of the product production chain can be orderly, which is the guarantee of product quality. By analyzing the purpose and function of product data management and control, this paper requires full consideration of the flexibility and expansibility of product data to avoid the lack of complementarity between product data and information, information cannot be effectively shared, resulting in some information island problems. It focuses on the enterprise must be equipped with the data management platform, form the classified management and control strategy of product research and development data, explore scientific and reasonable management and control methods, and effectively improve the efficiency of enterprise research and development. References | Related Articles | Metrics

Overview

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Planning and Prospect of General Assembly Workshop in the New Era WU Jie 2023, 48(8): 207-213.  DOI: 10.16638/j.cnki.1671-7988.2023.08.039 Abstract ( )   PDF (1334KB) ( )   By studying and comparing the general assembly workshop planning solution of mainstream vehicle manufacturers domestic and overseas, this paper studies how the general assembly workshop responds to the great challenges brought by the introduction of new energy vehicles, intelligent networking and other new technologies in the new era. The main planning directions to meet these challenges are discussed, such as the large-scale application of automatic guided vehicle on the assembly main line to improve the process flexibility of the general assembly workshop; Pursue the production line form without pit and no conveyor bearing requirements of the plant to improve the subsequent modification flexibility of the general assembly workshop. The mixed production mode of forced assembly line and island assembly station is adopted to improve the flexibility of mixed production in the general assembly workshop and reduce the modification investment for the introduction of new technologies, processes and products. References | Related Articles | Metrics

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A Conception of Efficient Support for Military Vehicles LI Jun, 2023, 48(8): 214-217.  DOI: 10.16638/j.cnki.1671-7988.2023.08.040 Abstract ( )   PDF (1280KB) ( )   With the development of science and technology and the improvement of weapon informatization, national defense equipment has gradually developed from independent mechanical weapons in the last century to intelligent weapon systems that will be realized now and in the future. High-tech weapons and equipment have become effective in war defense and attack. The lifetime reliability of tools and equipment is very important, but at the same time, the maintenance of complex equipment and the support capability of troops will seriously restrict the continuous and efficient use of equipment. This paper analyzes the characteristics and combat mode of future equipment, and conceives an efficient support method for military vehicle equipment. Considering the improvement of the maintenance capability of the grass-roots support brigade, the improvement of the support efficiency of the support department, and the expansion of the support channels for support and maintenance, the realization of management, technology and resources have been comprehensively upgraded to support the efficient guarantee of equipment. References | Related Articles | Metrics