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30 July 2022, Volume 47 Issue 14 Previous Issue    Next Issue
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
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New Energy Vehicle

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Optimization of Electric Vehicle Charging Pile Configuration Based on Multi-objective Planning LIAO Yuting 2022, 47(14): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2022.014.001 Abstract ( )   PDF (504KB) ( )   Abstract: As an effective way to solve energy shortage and environmental pollution, electric vehicle has become a research hotspot. The development of electric vehicle is restricted by factors such as unreasonable distribution of charging infrastructure and poor operation and maintenance. This paper analyzes the influencing factors of charging pile construction and uses the queuing theory model to establish a charging station operator's initial investment cost and later operation and maintenance cost. The charging pile configuration model whose objective function is to minimize the charging waiting time cost of the charging user, study the configuration problem of the number of charging piles in the charging station under the mode of known charging demand. Taking a business district in Guiyang as an example, the study founds that when 11 charging posts were installed, the combined costs of charging users and operators were the lowest, and the utilization rate of charging posts was the best, the analysis of the example verifies the feasibility of the model. References | Related Articles | Metrics

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Driving Range Influencing Factors of a Pure Electric Vehicle PENG Cong 2022, 47(14): 6-8.  DOI: 10.16638/j.cnki.1671-7988.2022.014.002 Abstract ( )   PDF (582KB) ( )   In order to explore the influence of factors such as trim quality on the driving range of pure electric vehicles and the sensitivity of related factors, the simulation model of a pure electric vehicle was established by AVL Cruise software. 16 groups of simulation experiments were obtained by modifying the basic data of the curb weight, the speed ratio of the reducer, the wind resistance coefficient and the rolling resistance coefficient. Analyze the influence of different influencing factors on driving range and the sensitivity of related influencing factors. The results show that the driving range of a pure electric vehicle decreases with the increase of curb weight, wind resistance coefficient and rolling resistance coefficient. When the speed ratio of reducer is set to a certain value, the maximum driving range can be obtained. The readjust quality has the highest sensitivity to driving range, while the reducer speed ratio has the lowest sensitivity to driving range. References | Related Articles | Metrics

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

Intelligent Connected Vehicle

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Warning Methods of Pedestrian Crossing XIAO Kaiwen 2022, 47(14): 12-16.  DOI: 10.16638/j.cnki.1671-7988.2022.014.004 Abstract ( )   PDF (892KB) ( )   Pedestrians are an indispensable part of the traffic system, and they are also the most flexible, complex, and changeable factors in the traffic scene. According to statistics, more than 90% of traffic accidents are caused by human factors. This paper mainly focuses on pedestrians and studies the early warning method for pedestrians crossing the street. It is established a microscopic interaction model of pedestrians and vehicles, and proposed an attention degree algorithm based on the deviation angle of the pedestrian’s head; collected a bird’s-eye view video of pedestrians and vehicles, calibrated the two-dimensional coordinate points of pedestrians and vehicles as trajectory data, and using trajectory data and heads, deviation angle calculates the maximum acceleration and the degree of attention, and clusters the two typical crossing styles with the maximum acceleration and the degree of attention. Analyze the warning degree of different street crossing styles. Finally, the generative confrontation network model is used to predict the trajectory of pedestrians during human-vehicle interaction; trace with a predicted trajectory describe the reaction of pedestrians to interactive vehicles, this experiment is useful for studying unsignalized intersections. The movement style and trajectory distribution of pedestrians crossing the street have important reference significance. Theoretically, the safety of pedestrian vehicle interaction at unsignaled intersections is enhanced. References | Related Articles | Metrics

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Design of Unmanned Fast Integrated Road Detection Vehicle System WANG Bo 2022, 47(14): 17-20.  DOI: 10.16638/j.cnki.1671-7988.2022.014.005 Abstract ( )   PDF (1002KB) ( )   Road inspection vehicle is a special road detection vehicle, the combination of unmanned driving technology and road detection technology, can solve the problem of unmanned road detection on the future intelligent high-speed. In the process of data collection of road characteristics, it is necessary to rely on road section positioning, line laser scanning pavement, image acquisition and other technical means, and unmanned vehicles in the process of autonomous driving, need to rely on their own radar, camera, GPS positioning device to complete the autonomous obstacle avoidance trail, there are many similarities in the on-board equipment, the unmanned rapid comprehensive road detection vehicle designed in this paper, through the integration of the latest unmanned driving technology and advanced road detection technology, to achieve rapid unmanned operation, Relying on GPS positioning to collect road information more accurately, completing the three-dimensional reconstruction of the road surface and analyzing the status of road diseases is the application of unmanned driving technology in the field of road detection, which brings innovation to the traditional road inspection technology. References | Related Articles | Metrics

Design and Research

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Design of the Hydraulic System for Commercial Vehicle Cab LV Wenbing 2022, 47(14): 21-24.  DOI: 10.16638/j.cnki.1671-7988.2022.014.006 Abstract ( )   PDF (732KB) ( )   The transportation industry plays an indispensable role in the national economy. As a carrier in the transportation industry, the maintainability and cab comfort of commercial vehicles are affected by the hydraulic cab tilting system. In order to achieve lower manufacturing and design costs, a new cab hydraulic system and hydraulic integrated valve structure were designed. The follow-up function of the new cab hydraulic system was undertaken by the hydraulic valve, and the parameters of the hydraulic valve could be adjusted by springs. In this paper, catia software was used to model the structure of the hydraulic valve, and matlab software was used to model and simulate the lifting process. The adjustable spring structure parameters of the hydraulic valve were affected by the lifting force. The analysis results showed that the new cab hydraulic system met the requirements of various working conditions of the cab, and the functions realized by the new hydraulic valve were consistent with the schematic diagram of the hydraulic system. The simulation results showed that the maximum lifting force during the lifting process was 19 112 N, which was basically consistent with the experimental results. References | Related Articles | Metrics

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A Vehicle Over Load Detection System Based on Piezoelectric Sensor MA Rongze 2022, 47(14): 25-31.  DOI: 10.16638/j.cnki.1671-7988.2022.014.007 Abstract ( )   PDF (1262KB) ( )   In order to effectively manage vehicle overload, this paper proposes a vehicle dynamic weighing system based on piezoelectric sensor, which is suitable for off-site law enforcement. A new sensor layout is proposed, and the hardware system is designed as a whole. The improved signal processing method of load cell is proposed, and the system software is designed. The system precision is controlled within 5%, and the system precision and cost are considered. In order to verify the accuracy of the test results of the design system, the road field test is carried out to obtain the vehicle axle load data. The test results show that the developed overload detection system can meet the accuracy requirements of dynamic weighing, which has high practical application value. References | Related Articles | Metrics

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Optimal Design of FSAE Racing Car Steering System WANG Penglin 2022, 47(14): 32-36.  DOI: 10.16638/j.cnki.1671-7988.2022.014.008 Abstract ( )   PDF (1319KB) ( )   In order to improve the cornering speed and handling stability of FSAE formula car, an optimization analysis method of MATLAB and ADAMS co-simulation is proposed to design the steering system. Firstly, the plane kinematics model of steering trapezoid is established by using MATLAB software, and the preliminary structure design is carried out. Then, ADAMS CAR is used to establish the virtual prototype model of the front suspension and steering system to realize dynamic optimization. The optimal Ackerman percentage of the steering trapezoid is obtained by taking the outer point of the tie rod as the optimization variable, which achieves the expected design goal. The accuracy of the simulation and optimization analysis method of MATLAB and ADAMS is verified. References | Related Articles | Metrics

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The Design and Application of Automatic Generation Software for Crash Test Report LU Jun 2022, 47(14): 37-41.  DOI: 10.16638/j.cnki.1671-7988.2022.014.009 Abstract ( )   PDF (1322KB) ( )   In order to solve the problems of low efficiency, high error rate and long time-consuming when manually completing the test report, this paper mixed editing with Office Word and Excel is realized by MATLAB program, and an automatic generation software system for crash test report is designed to analyze test data and generate reports quickly and accurately. This paper first introduces the basic principle on controlling Word by MATLAB, then elaborates the system design and architecture of the software, and finally shows an example through a typical crash test report. The results show that the software system can improve work efficiency, reduce report editing time and improve report quality. References | Related Articles | Metrics

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Static Characteristics of Control Arm Bushing of the Car ZENG Guorong 2022, 47(14): 42-46.  DOI: 10.16638/j.cnki.1671-7988.2022.014.010 Abstract ( )   PDF (1251KB) ( )   Control arm rubber bushing is an important bearing component and vibration isolation component in the automobile suspension system, its stiffness characteristics directly affect the elasticity kinematics of the suspension and the operation stability of the vehicle and NVH characteristics. Such control arm rubber bushing as the research object, using the uniaxial tensile test of rubber materials, fitting out material parameters of the Mooney-rivlin model, using nonlinear finite element software ABAQUS establishes finite element model of control arm rubber bushing, extracts the rubber bushing axial, radial and torsional stiffness and compares with the test results of trials, the results show that the error is less than 5%, verify the accuracy of the finite element model, it can guide rubber bushing product design and development. References | Related Articles | Metrics

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Optimization Design of the Air Filter Bracket Based on Hypermesh SONG Shasha 2022, 47(14): 47-51.  DOI: 10.16638/j.cnki.1671-7988.2022.014.011 Abstract ( )   PDF (3450KB) ( )   As an important part of the automobile intake system, the statics analysis of the air filter bracket under three extreme working conditions is carried out, and the deficiencies of the existing structure are found out. Two optimization schemes are put forward, but they still do not meet the strength requirements after analysis. Topology optimization method was used to optimize and improve the structure and statics analysis under multiple working conditions. By comparing the analysis results, the strength and stiffness of the structure were significantly improved without increasing the mass, and the best technical scheme of the air filter bracket was obtained, which provided an important reference for the later design of the air filter bracket. References | Related Articles | Metrics

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Optimization Design of Structure Parameters of Suction Nozzles of Vacuum Trucks CHEN Fanlei 2022, 47(14): 52-55.  DOI: 10.16638/j.cnki.1671-7988.2022.014.012 Abstract ( )   PDF (1636KB) ( )   The structure of vacuum truck's suction nozzle determines the distribution of flow field inside the suction nozzle and affects the efficiency of suction nozzle.The design of suction nozzle mainly involves the theory of dust dynamics, closed air curtain design and air confluence. This paper bases on the relevant theory, combines with the structural design principle of the suction nozzle, analyses the influence of the suction nozzle'smain structural parameters on its dust absorption performance. In order to minimize the local pressure loss in the inner cavity of the suction nozzle, the structural parameters are optimized.In this paper the physical model of the back blowing suction nozzle is established. Through the Fluent simulation analysis and comparison with the ordinary pure suction nozzle, the back blowing suction nozzle with slit air curtain nozzle has better vacuum effect. References | Related Articles | Metrics

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An Automobile Fuel Anti-theft Alarm Device WANG Kun 2022, 47(14): 56-59.  DOI: 10.16638/j.cnki.1671-7988.2022.014.013 Abstract ( )   PDF (1225KB) ( )   In order to avoid the theft of automobile fuel, an automobile fuel anti-theft alarm device is designed in this paper. This paper introduces the overall design, circuit design, functional design and functional test of the device in detail. The fuel anti-theft alarm has small volume and simple layout, and can be installed on the switch panel of the dashboard in the cab. The controller circuit can be divided into power supply circuit, signal input and output circuit, control circuit and alarm circuit according to its function. The alarm works when the tram stops under the key. When the fuel volume signal of the fuel tank is lost and the fuel volume of the fuel tank drops abnormally, the built-in buzzer and car horn can be driven respectively for audible alarm. After the anti-theft alarm is matched on the whole vehicle, the static current and alarm function test shall be carried out to ensure that the alarm will not adversely affect the circuit of the whole vehicle and that the alarm works normally. The device can automatically set up defense when the commercial vehicle stops for long-distance transportation, and send out an alarm when someone steals fuel. On the one hand, it reminds the driver to pay attention, on the other hand, it scares away the thief, so as to reduce the loss caused by vehicle fuel theft and reduce the driving burden of vehicle owners. References | Related Articles | Metrics

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Research and Optimization of Doors Closing Force of Heavy Truck CHEN Chongshan 2022, 47(14): 60-63.  DOI: 10.16638/j.cnki.1671-7988.2022.014.014 Abstract ( )   PDF (1302KB) ( )   Aiming at the problem of the large closing force of a heavy truck door, the key factors affecting the closing force of the door are studied and analyzed by testing the closing force of the actual vehicle doors under different closing conditions. The optimization solution is put forward and verified by actual vehicle, and the problem of large closing force is effectively improved. References | Related Articles | Metrics

Testing and Experiment

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Dispersion Stability Analysis of Graphene as Lubricating Oil Additive YAN Yunjing 2022, 47(14): 64-67.  DOI: 10.16638/j.cnki.1671-7988.2022.014.015 Abstract ( )   PDF (1531KB) ( )   Graphene is a two-dimensional carbon atom crystal with honeycomb structure. It has excellent properties and unique structure. It has been widely used in many fields, such as optics, nanocomposites, biosensors and so on. Based on the experimental devices of microwave-assisted ball milling and ultrasonic assisted ball milling, the dispersion stability of graphene is experimentally analyzed. Graphene is dispersed into the base oil by different dispersion methods such as dispersant dispersion and surface modification, so as to obtain graphene lubricating oil. Then the dispersion stability of graphene was detected by UV-Vis photometer and Zeta potential. After a series of studies, it can be seen from the research results that the composite treatment of surface modification and dispersant dispersion can maximize the stability of graphene in base oil. References | Related Articles | Metrics

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Uncertainty Evaluation of Type-0 Test with Engine Disconnected of Passenger Cars LIU Junwen 2022, 47(14): 68-72.  DOI: 10.16638/j.cnki.1671-7988.2022.014.016 Abstract ( )   PDF (970KB) ( )   Braking performance is one of the most important factors affecting automobile safety. In order to clarify the dispersion of the measured results in the braking performance test of passenger cars, the braking performance of vehicles can be evaluated more accurately and the safety performance of vehicles can be reflected, this paper conducts the Type-0 test (ordinary performance test with cold brakes) with engine disconnected of passenger cars, analyzes various factors that affect the measured results, and evaluates the uncertainty of the measured results. The method of the evaluation can be used for reference in the measurement uncertainty evaluation of similar braking performance test or other passenger cars road performance test. References | Related Articles | Metrics

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The Influence of Personality Traits on Young Drivers' Perception of Potential Hazards LIU Yali 2022, 47(14): 73-76.  DOI: 10.16638/j.cnki.1671-7988.2022.014.017 Abstract ( )   PDF (1010KB) ( )   This article takes young drivers as the research object, and uses questionnaire survey to explore the influence of personality traits, a relatively stable factor, on drivers' perception of potential dangers. The results show that introversion, neuroticism, and concealment have a certain degree of influence on young drivers' perception of potential danger. The research provides a good theoretical reference for developing a training platform for drivers' potential hazard perception ability and improving drivers' potential hazard perception ability through targeted training. References | Related Articles | Metrics

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Discussion on the Relationship between Pressure Rise and Driving Range of CNG Vehicles ZHANG Defu 2022, 47(14): 77-81.  DOI: 10.16638/j.cnki.1671-7988.2022.014.018 Abstract ( )   PDF (1040KB) ( )   Through the relationship of CNG density changing with pressure and temperature, this paper studies the theoretical basis of increasing pressure and effective measures to improve the driving range of CNG vehicles.The calculation model of CNG gas compression factor is established, and it is calculated that 35 MPa is the best comprehensive efficiency improvement point of CNG pressure.The variation of CNG density with temperature under 20 MPa and 35 MPa pressure is compared and analyzed. The inflation efficiency can be increased by about 45% in theoretical state, and about 50%～54% in actual rapid filling condition.Compared with WLTC test, the driving range can be increased by 70%. It is verified that the filling mode and charging temperature are the key factors affecting the charging efficiency. Graded cooling and charging after pressure increase is an effective measure to further improve the driving range of CNG vehicles. References | Related Articles | Metrics

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Analysis of the Influence of Automobile Front Windshield Trim on Wind Noise YANG Li 2022, 47(14): 82-87.  DOI: 10.16638/j.cnki.1671-7988.2022.014.019 Abstract ( )   PDF (3877KB) ( )   In order to study the influence of the structure of the front windshield trim strip on the wind noise performance of the vehicle in high-speed driving, PowerFLOW and PowerACOUSTICS were used to calculate and analyze the wind noise performance under three conditions of installing grooved trim strips, solid trim strips and uneasy trim strips. The models with 10 mm, 20 mm, 30 mm, and 40 mm front windshield trim widths were respectively analyzed, and the influence of the trim structure and width on the wind noise of the car was studied. The analysis results show that the car's front windshield trim can slow down the impact of airflow on the A-pillar and reduce the eddy current intensity, thereby reducing the intensity of wind noise and improving the wind noise performance of the car; the improvement is most obvious; a solid trim strip with a width of about 30 mm is most beneficial to the wind noise of the car. References | Related Articles | Metrics

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Estimation of Mass and Centroid Position of Heavy Semi-trailer XIAO Song 2022, 47(14): 88-94.  DOI: 10.16638/j.cnki.1671-7988.2022.014.020 Abstract ( )   PDF (1611KB) ( )   In order to obtain the information of mass and centroid position changes of distributed single-trailer vehicles more accurately, an estimation method combining cluster analysis and fuzzy rules is proposed. Based on the five-degree-of-freedom nonlinear vehicle dynamics model, the co-simulation experiment analysis was carried out with the help of Trucksim and MTTLAB/Simulink platform. The results show that the algorithm can accurately estimate the trailer mass and the centroid position in real time, and make the trailer mass estimation error within 1%, the centroid longitudinal height estimation error within 15%, and the centroid longitudinal position estimation error within 2%. References | Related Articles | Metrics

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The Impact of the Different Drivability on C-WTVC Fuel Economy and Emissions Based on EIL WANG Ben 2022, 47(14): 95-100.  DOI: 10.16638/j.cnki.1671-7988.2022.014.021 Abstract ( )   PDF (4500KB) ( )   With fuel economy and emission regulations for vehicles have become increasingly stringent year by year, it is difficult to evaluate whether the engine bench development reach the limit requirements of vehicle fuel economy and emission in the early stage of development. At the same time, the emission and fuel consumption are affected by the different driving styles on the vehicle. The impact of the drivability cannot be separated for evaluation. In this context, based on the C-WTVC cycle, a bench simulation test was carried out through the engine-in-the-loop system. From the simulation follow-up results of vehicle speed and engine speed, the working conditions of the whole vehicle can be accurately reproduced. The fuel consumption results of the EIL system and the vehicle are compared with the fuel consumption deviation of 1.63%, and the deviation of the NOx exhaust cycle results is 0.91%. The accuracy results prove that the EIL-in-the-loop test method can be used to carry out the simulation verification of the whole vehicle. Based on the test results, the correction of the accelerator pedal for two driving styles, dynamic and economical (the torque output dynamic correction corresponding to 0-50% accelerator pedal is 6%-8% higher than the economic correction torque), was tested on the C-WTVC cycle. The effect of the results relative to the original data, dynamic correction, cycle-weighted fuel consumption increased by 0.34%, acceleration average increased by 0.48%, NOx original exhaust results increased by 1.65%, economic correction, cycle-weighted fuel consumption decreased by 1.2%, acceleration average reduced by 0.24%, the result of NOx original exhaust cycle is reduced by 5.2%. So in the development process, it is necessary to consider the coverage of different driving style modes on the regulatory limit. References | Related Articles | Metrics

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Influence of Ambient Temperature on Vehicle Driving Resistance XU Chan 2022, 47(14): 101-104.  DOI: 10.16638/j.cnki.1671-7988.2022.014.022 Abstract ( )   PDF (1087KB) ( )   The influence of ambient temperature on the resistance of the vehicle will be directly fed back on the fuel consumption of the vehicle. In order to directly and effectively reduce fuel consumption, it is of great significance to study the effect of ambient temperature on the resistance of the vehicle. Combining the actual road sliding test of the whole vehicle and the internal resistance test of the rotating hub bench transmission system, it is found that the influence of ambient temperature on the main driving force of the whole vehicle is mainly reflected in three aspects: the influence on the transmission system, the influence on the air resistance and the influence on the tire rolling resistance. Carrying out a systematic study on these three aspects respectively, and finding out the mechanism of the influence of the ambient temperature on them, can effectively guide how to reduce the influence of the ambient temperature on the driving resistance of the car. References | Related Articles | Metrics

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Influencing Factors of the Barycenter Position and Data Processing for a Dura-axle Vehicle WANG Bo 2022, 47(14): 105-108.  DOI: 10.16638/j.cnki.1671-7988.2022.014.023 Abstract ( )   PDF (1248KB) ( )   Barycenter position of vehicle is closely related to vehicle driving safety. The accurate measurement of the barycenter position is of great significance for the structural design of vehicles. Base on measuring principle of barycenter, the authors analyze influencing factors of barycenter and measure barycenter of one Dura-axle vehicle according to GB/T 12538—2003. The result shows that the height value of barycenter is different when lifting vehicle for smaller angle, so when measuring the height of barycenter to avoid lifting smaller angle. The authors process actual barycenter data using the method of least squares to fitting. The height value of barycenter is uniqueness and accuracy by calculating the data after fitting. References | Related Articles | Metrics

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Lane Change Intention Identification of Motorists Based on Expressway LANG Yueru 2022, 47(14): 109-112.  DOI: 10.16638/j.cnki.1671-7988.2022.014.024 Abstract ( )   PDF (941KB) ( )   In recent years, vehicle safety has become the focus of social attention. There are two kinds of typical drivers' driving intentions in expressway, which are lane keeping and lane changing. In the process of intending to change lanes, higher requirements are put forward for the driver to control the vehicle. In this paper, a model based on BP neural network is proposed to detect the driver's lane change intention on expressway. The prediction results show that at the time of lane change, the prediction accuracy can reach 99.3%, pushing forward at an interval of 0.5 s, the accuracy of 1 s before lane change is 98.0%, the accuracy of 2 s before lane change is 84.8%, and the accuracy of 3 s before lane change is 70.7%: Random samples are selected to verify the accuracy of the model, and the accuracy of lane changing time is 96.7%. It lays a foundation for in-depth study of driver input characteristics. References | Related Articles | Metrics

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Analyses and Verification of High Temperature of a Light Truck LI Jie 2022, 47(14): 113-115.  DOI: 10.16638/j.cnki.1671-7988.2022.014.025 Abstract ( )   PDF (1419KB) ( )   In order to find out the reasons of the high coolant temperature performance of a light truck, combined with customer vehicle driving status and test on chassis dynamometer, comparative testing using the hub test method with precise control of boundary conditions. Analyzes the difference between engine load, fan state and thermostat state. The conclusion is that the thermostat can not be turned on in time in winter. Through simple on-site measures, the water temperature of the fully open thermostat was verified, and it was determined that the vehicle thermostat could not be opened in time in winter, so that the water temperature gauge indicated that the water temperature in winter was higher than that in summer. This conclusion can provide test support for engine product development, and remind the engine development process to pay attention to the verification of the timing of the engine thermostat opening under low load conditions. References | Related Articles | Metrics

Process and Equipment

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Study on Axle Housing Welding Stress Relieving CHI Jingcai 2022, 47(14): 116-120.  DOI: 10.16638/j.cnki.1671-7988.2022.014.026 Abstract ( )   PDF (1224KB) ( )   Due to the different road conditions, the axle housing will be affected by the impact load during the driving, which may lead to the deformation or fracture of the axle housing. In the axle housing structure, the welding seam position is one of the areas where the stress concentration is more obvious, and the welding seam stress at the welding seam position of the lower reaction rod bracket in the axle housing is the most concentrated. Therefore, the position is the easiest to crack and affects the service life of the axle housing and the safety of the whole vehicle. In this paper, Hawking welding stress relief equipment was used to deal with the weld stress concentration area, and explored the treatment effect of Hawking welding stress relief technology on the residual stress at the weld of axle housing. References | Related Articles | Metrics

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Application of PDCPD Material in Commercial Vehicles CHEN Rong 2022, 47(14): 121-124.  DOI: 10.16638/j.cnki.1671-7988.2022.014.027 Abstract ( )   PDF (1441KB) ( )   PDCPD material has the advantages of low density, balanced physical properties, excellent surface coating performance, and short molding cycle. It can be used as a substitute for SMC in the appearance of commercial vehicles. This article introduces the application status, molding process and performance characteristics of PDCPD materials at home and abroad. At the same time, the performance, processing technology and cost of PDCPD materials and SMC materials are analyzed and compared, and provides a basis for replacing SMC materials and achieving weight reduction of the whole vehicle. References | Related Articles | Metrics

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Body Shop Disordered Parts Automatic Picking System YU Miao 2022, 47(14): 125-129.  DOI: 10.16638/j.cnki.1671-7988.2022.014.028 Abstract ( )   PDF (1413KB) ( )   Automotive body shop is being with low automation rate in parts loading. Some parts with special rack in which parts are well separated and fixed and the parts are stacked in order are realized automatic loading. But the most of remained are disorderly stacked parts in metal bin. It is urgent to develop the standard engineering solution to implement automatic loading for the parts disorderly stacked in the bin. The study object is one typical sheet metal part. It is disorderly stacked in the standard metal bin with concave and convex surfaces. One standard solution is provided for this object by the combination of part gripper, stand for part posture adjustment and process gripper. At mean time, studies the payback period of investment between manual picking and automatic picking through one real example. For the automatic picking of disorderly stacked parts in the Body Shop, the key point is to separate the parts picking gripper from process gripper to simplify the automatic picking system of disorderly stacked parts. The payback period study also shows the standard solution for the disorderly stacked parts is lean and implementable. References | Related Articles | Metrics

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Application of Conical Elastic Ring FENG Yongming 2022, 47(14): 130-135.  DOI: 10.16638/j.cnki.1671-7988.2022.014.029 Abstract ( )   PDF (1060KB) ( )   The elastic ring is commonly used to limit the axial direction of the part in the transmission. Because of the accumulation of manufacturing errors of axial parts, there is the axial clearance after assembly. When there is a changing axial force on the part, the axial clearance can cause move and shock of the part, which can cause early failure and damage of the part and the elastic ring, and ultimately lead to the failure of the transmission. But this paper proposed that the application of conical elastic ring can effectively solve the above problems. Firstly, the structure, principle and advantages of conical elastic ring are described. Secondly, the force analysis of the conical elastic ring is carried out. The design ideas and methods of the conical elastic ring and its groove are analyzed, and the case applications are listed. Finally, the design method and application advantages of conical elastic ring are summarized to provide a better solution for the limit of axial direction of the part in the transmission. References | Related Articles | Metrics

Automobile Education

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Exploration and Practice of the Three Complete Education Ideological and Political Teaching Mode —Take the New Energy Vehicle Electrical System Maintenance Course as an Example MING Jianping 2022, 47(14): 136-140.  DOI: 10.16638/j.cnki.1671-7988.2022.014.030 Abstract ( )   PDF (1195KB) ( )   As the main process of school education and an important way of teaching and educating people, professional course teaching has the dual mission of knowledge imparting and value guidance. By building course ideological teaching team, using the combination of "combining online services and offline" whole process education mode, using "before class, in class, after class" comprehensive education way, the new energy automobile technology professional course new energy vehicle electrical system maintenance for the comprehensive ideological teaching mode exploration and practice, most students can strictly abide by the "finishing, consolidation, cleaning, cleaning up, literacy, safety, saving, service" professional quality, develop " craftsman spirit" profes-sional quality, set up the "skills power, labor spirit" professional goals. This teaching mode provides the reference experi- ence for the ideological and political teaching of higher vocational automobile professional courses. References | Related Articles | Metrics

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Teaching Reform of Hydraulic Transmission Course Based on Simulation SUN Wenf 2022, 47(14): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2022.014.031 Abstract ( )   PDF (1136KB) ( )   According to the requirements of engineering education for the cultivation of applied talents, this paper analyzes the teaching status and existing problems of hydraulic transmission course, and reforms the teaching objectives, teaching contents, teaching modes and assessment methods, so as to make the teaching objectives more clear and the teaching contents more in line with the reality of vehicle engineering specialty. It has strengthened the application of teaching modes such as case teaching method, mixed teaching method and simulation experiment teaching, optimized the assessment methods of the course, increased the proportion of process assessment scores in the total course scores, and formed a diversified academic assessment and evaluation system with equal emphasis on ability and knowledge. References | Related Articles | Metrics

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Mobile Learning Platform and Flipped Classroom in Mechanical Foundation Application in Teaching Reform FAN Guiqin 2022, 47(14): 145-149.  DOI: 10.16638/j.cnki.1671-7988.2022.014.032 Abstract ( )   PDF (1144KB) ( )   In order to solve the problems that students are not interested in theoretical knowledge、 students are not active enough in learning、the traditional teaching mode no longer adapt to the current practical needs, changing the traditional teacher centered teaching mode in the classroom, adopting the teaching model of mobile learning platform and flipped classroom, this paper proposes a teaching reform based on the mobile learning platform and flipped classroom in the fundamentals of machine courses, student-centered and teacher-guided model. Organically combine the three links before class, during class and after class, make the knowledge transfer more efficient, do learn to use, improve students' learning output. It gives full play to students' subjective initiative, permeates professional quality and team spirit, and obtains good teaching results in the implementation process. References | Related Articles | Metrics

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The Teaching Reform and Practice of Vehicle Structure Disassembly Training Based on the PBL Concept SONG Xiaoyan 2022, 47(14): 150-154.  DOI: 10.16638/j.cnki.1671-7988.2022.014.033 Abstract ( )   PDF (3121KB) ( )   In this paper, problem based learning (PBL) teaching method is applied to the teaching design of automobile structure disassembly training course. The teaching content construction, teaching methods and means reform three aspects are studied. Through teaching reform and practice, students can better master the structure knowledge of the whole vehicle in the limited classroom teaching, help students achieve better learning experience and learning effect, and realize the teaching based on the industry development demand and professional certification standard. References | Related Articles | Metrics

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Discussion on Teaching Reform of Numerical Control Technology Course Based on Modern Information Means of CATIA ZHANG Yaping 2022, 47(14): 155-159.  DOI: 10.16638/j.cnki.1671-7988.2022.014.034 Abstract ( )   PDF (1276KB) ( )   In this paper, aiming at the training goals of applied undergraduate vehicle engineering majors, combined with the requirements of applied talents in today's automobile industry, using CATIA modern information means for numerical control technology courses, the teaching reform idea, teaching reform plan, teaching mode, teaching evaluation system and assessment are studied. Research and exploration have been carried out on the reform of teaching methods and other aspects, and strive to achieve experiments in theory and verification of theories in practice, which has changed the phenomenon of disconnection between theory and practice in previous teaching. The results show that students' interest in learning has been stimulated, and practical skills can be improved, and the teaching quality has been significantly improved compared with the previous pure theoretical teaching. References | Related Articles | Metrics

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Some Thoughts on Cracking Key Techniques and Tactics of Electric Bicycle Fire Fighting HUANG Zhongjie 2022, 47(14): 160-163.  DOI: 10.16638/j.cnki.1671-7988.2022.014.035 Abstract ( )   PDF (1012KB) ( )   In recent years, electric bicycle fire accidents occur frequently, and small fire deaths occur from time to time, causing severe loss and huge impact. Based on the research of key components structure of electric vehicles, analysis of the risk factors of two types of electric vehicles, combined with the experience of fire-fighting and rescue education and training, the author summarizes the key technologies of this kind of fire-fighting and rescue. Strive to reduce the occurrence of such accidents, casualties and property lose, Strive to"fight small, fight early, fight", the initial fire control should set up scientific alert, reasonable choice of position, reconnaissance and rescue gradually in-depth. providing effective reference for the majority of users, management departments at all levels and full-time and part-time fire-fighting and rescue personnel. References | Related Articles | Metrics

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Application Analysis of New Energy Technology on Dedicated Vehicle Chassis LIU Guocan 2022, 47(14): 164-167.  DOI: 10.16638/j.cnki.1671-7988.2022.014.036 Abstract ( )   PDF (1089KB) ( )   New energy technology provided power and direction for the development of the automotive industry, and for new energy vehicles, chassis is the top priority. This paper starts from the new energy technology, the importance and the development trend of the chassis, the development trend of new energy technology are analyzed. This paper examines the integration and regulation of new energy technology on special vehicle chassis, describes the design and application development of new energy technology in the automobile industry, and finally proposes the innovative design of special vehicle chassis to provide a reference for the design and application of new energy vehicles. References | Related Articles | Metrics

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Research on the Competitive Environment of Pure Electric Vehicle as Online Car Hailing Based on PEST Analysis —Take Third, Fourth and Fifth Tier Cities for Example MOU Yuzhuang 2022, 47(14): 168-172.  DOI: 10.16638/j.cnki.1671-7988.2022.014.037 Abstract ( )   PDF (991KB) ( )   After the legalization of online car-hailing, (Blade Electric Vehicles, BEV) with low operating costs and environmental friendliness enter the online car-hailing market. However, in the third, fourth and fifth tier cities, the penetration rate of electric vehicle online car-hailing is relatively low. In order to promote the electric vehicle to enter the online car-hailing market further, based on the online car-hailing market and the characteristics of the electric vehicle, using (Politics Economy Society Technology, PEST) analysis method from the policy, economy, society and technology four macro environment of electric vehicle as online car-hailing in the third, fourth and fifth tier cities around the network competition environment were analyzed, and the study restricting car line in the third, fourth and fifth tier cities around the BEV online car-hailing development of macro factors, In addition, specific suggestions and measures are put forward for the development of electric vehicle ride-hailing vehicles. That is, local governments encourage the use of electric vehicle by formulating loose policies and reasonably planning charging facilities. Car-hailing platforms take measures such as reducing attachment fees and differentiated service prices to guide drivers and customers to use electric vehicle online car-hailing, so as to increase the penetration rate of electric vehicle in the third, fourth and fifth tier cities. References | Related Articles | Metrics

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Analysis of Environmental Benefits and Environmental Management Countermeasures of New Energy Vehicles BIAN Qingzhu 2022, 47(14): 173-175.  DOI: 10.16638/j.cnki.1671-7988.2022.014.038 Abstract ( )   PDF (1006KB) ( )   In recent years, our country's economy has developed rapidly, and the living standards of the people have been continuously improved. However, in the process of economic development, the importance of protecting the environment has not been properly recognized, and the increase in the number of automobiles has caused serious damage to the atmosphere by pollutants such as exhaust gas. With the increasing environmental pressure in our society, people have begun to realize the importance of protecting the environment and actively respond to the relevant national environmental protection policies. The emergence of new energy vehicles has alleviated the air pollution caused by vehicle exhaust, and provided a new way for environmental protection. The article will start the analysis based on the concept of new energy vehicles, discuss the current problems of new energy vehicles, and make in-depth thinking in order to improve the management level of new energy vehicles. References | Related Articles | Metrics

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Application of EPB System in Heavy Commercial Vehicles ZHANG Jing 2022, 47(14): 176-179.  DOI: 10.16638/j.cnki.1671-7988.2022.014.039 Abstract ( )   PDF (1205KB) ( )   Compared with traditional braking system, electrical park brake system combines electronic control mode with paking brake, parking brake and service brake combined, the controller communicates with other electric control systems of the whole vehicle through the controller area network line network to realize networking and intelligence, the safety and reliability of the vehicle braking system are improved. The paper expounds in detail the main components, control principle of parking brake and release, remporary stop and release, control principle of electrical park brake. Through the application in heavy commercial vehicles, the braking efficiency is studied, including the braking response time, braking distance and the influence of braking deceleration. The results show that electrical park brake matching can significantly improve the braking response time, reduce the braking distance, and greatly improve the safety and reliability of forward braking. References | Related Articles | Metrics

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Discussion on Automobile Platform Design ZHU Zhonghua 2022, 47(14): 180-183.  DOI: 10.16638/j.cnki.1671-7988.2022.014.040 Abstract ( )   PDF (1107KB) ( )   With the gradual improvement of the automobile industry and the growing maturity of the market, there are more and more automobile manufacturers, and the number of new automobile industry are also on the rise. The automobile market has entered the elimination race and the new vehicles and upgrading vehicles have been accelerating. Platform and modularization has been a common consensus among car enterprises, especially after the market has generally accepted electric vehicles and hybrid vehicles, the platform design of vehicle not only considers fuel vehicles, at the same time, we should give consideration to hybrid and electric vehicles. This paper mainly introduces the application of advanced vehicle enterprises in china and abroad in the platform, and introduces the development process according to the development experience of JAC in the platform design, and puts forward the decision-making elements of the platform development in the early stage of the platform development: the number of technicians, the level of technical ability or experience, the R&D funds that can be invested, the future product sales, the product price level,profitability, the development cycle, etc, It also studies the relationship between the degree of platform and investment, and the relationship between sales and benefits, so as to provide decisionmaking basis for car companies to design platform models that meet their actual conditions. References | Related Articles | Metrics