Archive

30 November 2022, Volume 47 Issue 22 Previous Issue   
---
New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
Standards Regulations Management
Overview


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

New Energy Vehicle

Select

Study on Power System Efficiency Calculation and Test Method of Fuel Cell Vehicle WEN Zui 2022, 47(22): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2022.022.001 Abstract ( )   PDF (957KB) ( )   In view of the lack of efficiency evaluation methods for fuel cell vehicle power system at present, this paper proposes a calculation method for the efficiency of fuel cell vehicle power system under different working modes from the perspective of total energy source and distribution, and uses the least square method to calculate the real time internal resistance of the power battery and obtains the energy consumption of the power battery. The fuel cell power system with direct connection configuration was tested on the power system test bench under steady operating conditions, and the power changes at different levels of the power system at different speeds were analyzed and compared, and the efficiency calculation method was verified. References | Related Articles | Metrics

Select

Development Status and Trend of DC Charging for Electric Vehicles DING Keyun 2022, 47(22): 6-10.  DOI: 10.16638/j.cnki.1671-7988.2022.022.002 Abstract ( )   PDF (574KB) ( )   As the permeability of new energy vehicles has been further improved in recent years, the importance of DC charging as a fast energy replenishment method has become increasingly prominent. At present, according to different energy supplement scenarios, the main DC charging modes of electric vehicles include DC charging, high-power DC charging and low-power DC charging. Based on in-depth research on the product and technology planning of 15 enterprises such as passenger cars, commercial vehicles and electric charging operation, combined with standard development, national and local policies and macro situation, this paper analyzes and concludes the development direction of electric vehicle DC charging: High-power DC charging will mainly be used for high-end models; Low-power DC charging scenarios will be developed in specific scenarios, such as service providers and community public DC charging scenarios, and will be developed according to the popularity of V2G technology. In terms of charging power, the vehicle model development will gradually upgrade from models supporting charging power of less than 100 kW to models supporting charging power of more than 180kW. The mainstream charging power of pile enterprises will also be increased to 120 kW～180 kW, and charging piles with higher power of 240kW and 360kW will be equipped. References | Related Articles | Metrics

Select

Control Strategy of Pure Electric Sanitation Vehicle ZHAO Jinbao 2022, 47(22): 11-15.  DOI: 10.16638/j.cnki.1671-7988.2022.022.003 Abstract ( )   PDF (1044KB) ( )   As an energy-saving and environment-friendly vehicle, electric sanitation vehicle plays a vital role in urban life. The research object of this paper is a pure electric driven sanitation vehicle with multiple working modes. In this paper, the dual motor torque distribution strategy, the optimal efficiency shift strategy and the dual motor gearbox cooperative control strategy are formulated. The three control strategies can not only make the driving motor and operating motor work efficiently, but also give full play to the power of the system, so as to realize the economy of the whole vehicle The simulation analysis shows that the power and economy of the new control strategy are improved by 19.7% and 9.8% respectively compared with the original strategy. References | Related Articles | Metrics

Select

Optimization of Vibration and Noise of an Electric Vehicle Air-conditioning Compressor MA Yiming 2022, 47(22): 16-20.  DOI: 10.16638/j.cnki.1671-7988.2022.022.004 Abstract ( )   PDF (1705KB) ( )   This paper analyzed and studied the problem that a pure electric car of an independent brand had high noise and vibration inside the car when the speed of the electric compressor was 2 500 r·min-1 , the noise inside the car and the vibration of the steering wheel were large, and when the speed of the compressor was above 4 000 r·min-1 , the noise and vibration inside the car were prominent. After analysis and research, a new solution was proposed to combine the transmission path optimization with the control strategy of the air conditioning system. Through the path scheme verification and the drawing of the control strategy matrix, the problem of vibration and noise when the electric compressor was working is solved, and the ride comfort was effectively improved, which was of high engineering significance. References | Related Articles | Metrics

Intelligent Connected Vehicle

Select

Design of Multi-objective Optimization Longitudinal Speed Tracking Algorithm for Intelligent Bus LI Junbao 2022, 47(22): 21-30.  DOI: 10.16638/j.cnki.1671-7988.2022.022.005 Abstract ( )   PDF (1576KB) ( )   A multi-objective optimization hierarchical control algorithm is proposed for the longitudinal motion of the intelligent bus to realize the accurate tracking of the longitudinal speed of the intelligent bus and meet the requirements of passenger comfort and battery endurance. The model predictive control algorithm is adopted in the upper control layer and the cost function integrating speed tracking accuracy, comfort, and battery endurance is adopted. The lower control adopts the cascade control method of inverse longitudinal model and anti-integral windup Proportion Integral (PI) to compensate for the nonlinear dynamics of the vehicle model. The simulation results show that the proposed controller has good robustness to external disturbance and system uncertainty, and has a good control effect in speed tracking accuracy, endurance and comfort. References | Related Articles | Metrics

Select

Analysis of the Driver Model under Large Curvature Cornering Condition HAN Changming 2022, 47(22): 31-34.  DOI: 10.16638/j.cnki.1671-7988.2022.022.006 Abstract ( )   PDF (782KB) ( )   In order to improve the path tracking accuracy of the driver model and ensure the lateral stability of the vehicle, this paper proposes a driver model for the large curvature cornering condition. The model adopts a two-point preview model with lateral preview error adjustment. The model realizes the output of the steering wheel angle according to the lateral error at the preview point.Meanwhile, the brake pressure of the vehicle is determined by different cornering angles and vehicle speeds to achieve path tracking on the desired road. Finally, in the co-simulation environment of TruckSim and Simulink, the simulation results of the path tracking control of the driver model proposed in this paper are compared and analyzed. The results show that the model can effectively track the desired path under the large curvature cornering condition. References | Related Articles | Metrics

Select

Status and Prospect of Intelligent Cockpit Interactive Experience DA Linna 2022, 47(22): 35-39.  DOI: 10.16638/j.cnki.1671-7988.2022.022.007 Abstract ( )   PDF (724KB) ( )   Never before has the auto industry changed so much. Due to the change of consumer groups as while as the significantly increased competition, business models innovate constantly. Users are hungry for the perfection of smart car experience. To improve the smart car experience and users' sense of gain, this article reviews voice interaction, gesture interaction and visual interaction, summarizes and analyzes the basic situation, application principle, technical obstacles of commercialization process and other contents of the current main intelligent cockpit interactive methods. It provides some ideas of the improvement and the outlook of the intelligent interactive experience, which will provide useful reference for the subsequent work of improving users' intelligent cockpit experience. References | Related Articles | Metrics

Select

Road Target Tracking Algorithm Based on Imporved YOLOv5 and DeepSort LIU Zhaobo 2022, 47(22): 40-44.  DOI: 10.16638/j.cnki.1671-7988.2022.022.008 Abstract ( )   PDF (1188KB) ( )   In the face of complex road environment, a road environment target tracking optimization algorithm model based on YOLOv5 and DeepSort is proposed. The recognition of road environment targets is based on YOLOv5. The basic structure of MobileNet V3 network is used to replace the recognition network in DeepSort algorithm and the backbone network in YOLOv5, which can compress the model and speed up the detection. This paper adopts the method of combining CIoU and GIoU to modify the original loss function, which makes up for the defect that GIoU degenerates into IoU in some cases. The experimental results show that the model weight decreases while the target tracking accuracy of the original network is improved, which can better achieve the continuous tracking effect. References | Related Articles | Metrics

Select

Trajectorg Tracking and Control of Unmanned Vehicles CHEN Cheng 2022, 47(22): 45-49.  DOI: 10.16638/j.cnki.1671-7988.2022.022.009 Abstract ( )   PDF (1206KB) ( )   In recent years, with the rapid development and wide application of unmanned driving technology, the key technologies related to unmanned driving have attracted a large number of scholars at home and abroad. On the one hand, the research on driverless technology provides a theoretical basis for the development of modern intelligent vehicles. On the other hand, the increasingly mature driverless technology can greatly improve vehicle ride comfort and vehicle driving safety, and provide technical support for the development and application of intelligent transportation systems. Trajectory tracking is one of the key technical problems in the development of unmanned vehicles. Based on the vehicle kinematics model, this paper uses pure tracking algorithm and Stanley algorithm to track and control the unmanned vehicle. Through MATLAB/ Simulink software, the trajectory tracking effects of the two algorithms under the same working condition are verified respectively. The results show that the two algorithms can make the unmanned vehicle trajectory the reference track well at low speed. In the case of medium and high speed, the tracking effect of the two control algorithms is not very ideal. References | Related Articles | Metrics

Design and Research

Select

Study on Teaching Problems about the Change of Meshing Angle in Face Gear Transmission GUO Hui 2022, 47(22): 50-53.  DOI: 10.16638/j.cnki.1671-7988.2022.022.010 Abstract ( )   PDF (1234KB) ( )   Face gear is different from any other conventional gear in that the tooth shape Angle gradually changes along the tooth width. The small pressure Angle at the inner diameter end leads to the root cutting at the inner diameter end, while the large pressure Angle at the outer diameter end leads to the cusping of the tooth tip, so the design of the tooth width is limited. Influenced by the understanding of conventional gear tooth shape, many students and researchers have difficulty in understanding the tooth shape characteristics of face gear. In order to make students understand the tooth surface characteristics of face gear more intuitively in the process of teaching and scientific research, this paper conducts in-depth analysis and research from the meshing principle and the process of space tooth surface development, and clearly shows the reasons for the change of tooth shape angle. In this paper, based on the tooth surface equation and meshing principle of face gear, the calculation formula of meshing angle at different positions of face gear is derived, and the characteristics of tooth shape at two sections are introduced in the form of drawing. Finally, an example and the result of pressure angle calculation are given, and the difference between face gear and bevel gear is analyzed. References | Related Articles | Metrics

Select

Vibration Isolation Characteristics of Commercial Vehicle Cab Mounting System Based on Blind Source Separation LIU Chunhui 2022, 47(22): 54-58.  DOI: 10.16638/j.cnki.1671-7988.2022.022.011 Abstract ( )   PDF (950KB) ( )   Taking the vibration isolation characteristics of the cab mounting system of a commercial vehicle as the research object, this paper studied the blind source separation method of the road spectrum vibration signal of the whole commercial vehicle, identified the excitation vibration source characteristic information of the cab under various road conditions and vehicle speeds, and combined the vibration mode analysis of the cab mounting system. The response law between the vibration source excitation and each mode of the cab mounting system and the vibration isolation characteristics of the cab mounting system were proved, which provided a theoretical basis for the parameter optimization of the mounting system and the improvement of the seat. The cab mounting system model and the vehicle multi-body dynamics model were established through ADAMS software. The cab vibration response and the vibration isolation characteristics of the mounting system under the vehicle environment were simulated. The technical parameters of the mounting system were optimized and matched, and the best vibration isolation technical parameters of the cab mounting system were obtained. References | Related Articles | Metrics

Select

Design and Development of Hardware-in-the-Loop Simulation Test System for Electronic Control Unit Based on NI-PXI Platform WU Liguang 2022, 47(22): 59-64.  DOI: 10.16638/j.cnki.1671-7988.2022.022.012 Abstract ( )   PDF (3675KB) ( )   The hardware-in-the-loop (HiL) experiment platform can effectively improve the efficiency of control system development. Nowadays, the HiL platform of various electronic control units (ECU) has a high degree of specialization and low of integration, thus cumbersome to operate. To solve these problems, this paper designed a universal HiL system for vehicle ECU tests based on the NI-PXI platform, which achieved the improved integration and simplified operation. Based on LabVIEW and VeriStand, the host computer monitoring and management interface was developed to implement manual testing, data playback, model simulation, power control, etc., which realized the unified scheduling and management of equipment. Meanwhile, a general fault injection module based on controller area network (CAN) bus was designed to improve the economy and application range. The HiL system was used to simulate and test the electronically controlled suspension, which achieved the expected test results, thus verified the control logic of the suspension controller. Finally, a test report was generated via running the test case. The practical application shows that this HiL system is easy to use and has a certain versatility, which can effectively improve the development efficiency of electronic control units. References | Related Articles | Metrics

Select

Traffic Capacity Analysis of Roundabout Based on VISSIM Simulation HAO Shuaijie 2022, 47(22): 65-69.  DOI: 10.16638/j.cnki.1671-7988.2022.022.013 Abstract ( )   PDF (1132KB) ( )   As a special road intersection, roundabouts have the advantages of high safety and few conflict points. Through the microscopic simulation of the roundabout, the traffic capacity of the intersection after different improvement measures can be effectively calculated. In this paper, VISSIM simulation software is used to simulate the traffic capacity of roundabouts. Taking two specific cases as examples, the traffic capacity of roundabouts under two different signal control schemes: no signal-controlled roundabout and signal-controlled roundabout are studied. The results showed that the traffic capacity decreased after signal control was applied to the three-entry single loop roundabout; the traffic capacity was improved significantly after signal control was applied to the four-entry multi-loop roundabout. References | Related Articles | Metrics

Select

The Lubrication Structure Optimization of Reducer Housing in Integrated Electric Drive System Based on SPH Method GONG Zhanfeng 2022, 47(22): 70-74.  DOI: 10.16638/j.cnki.1671-7988.2022.022.014 Abstract ( )   PDF (1879KB) ( )   With the global focus on carbon emissions and the demand of customers for lower car costs, the electrification of commercial vehicles has become the development trend of this industry. The integrated electric drive is a newly developed products in our company. Its structure is completely different from the traditional axle structure. The lubrication experience of traditional axle industry can not meet the design requirements of reducer housing in electric drive system. How to design the lubrication structure of reducer has become the focus of designers. This paper provides an example of structural optimization of reducer based on smoothed particles hydrodynamics (SPH) method, and the effectiveness of lubrication structure optimization is proved by bench test. This example can provide reference for optimization design of lubrication structure of similar products. References | Related Articles | Metrics

Select

Study on Comfort Improvement of the Clutch Actuation System for a Heavy-duty Vehicle ZHAO Xuan 2022, 47(22): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2022.022.015 Abstract ( )   PDF (1410KB) ( )   Due to the wide application of manual mechanical transmission in heavy vehicles, in the control process of the transmission system, human-computer interaction is frequent, and the unreasonable control system will not only affect the performance of the whole vehicle, but also increase the driver's work intensity and affect the driving experience. From the perspective of ergonomics, this paper analyzes and discusses the layout of the clutch pedal, the control and adjustment of the key points of the pedal stroke and the clutch pedal force, aiming to improve the comfort of the clutch control system and provide some improvement schemes for improving the performance of the clutch control system. References | Related Articles | Metrics

Select

Research on Design Theory and Method of Split Type Solenoid Valve KONG Qingle 2022, 47(22): 80-83.  DOI: 10.16638/j.cnki.1671-7988.2022.022.016 Abstract ( )   PDF (1317KB) ( )   This paper focuses on the definition, structure, working principle, advantages and disadvantages of the split type solenoid valve. Combined with the split type solenoid valve products on the market and the demand characteristics of automatic transmission, through theoretical calculation, simulation analysis and optimization, test verification, consistency influence factor analysis, a high precision split type solenoid valve suitable for wet dual clutch automatic transmission is designed. And in the design process to form a complete split type solenoid valve design theory and method, at the same time in the split type solenoid valve hydraulic module application and cost reduction to achieve a great breakthrough, for the design of the solenoid valve laid the foundation. References | Related Articles | Metrics

Select

Research and Application of Error-proof Technology for Diesel Engine Assembly LI Jiangnan 2022, 47(22): 84-87.  DOI: 10.16638/j.cnki.1671-7988.2022.022.017 Abstract ( )   PDF (1547KB) ( )   Error-proof design is very important for the assembly and maintenance of diesel engines. It can reduce the problem of wrong assembly caused by design errors from the source, avoid wrong and missed assembly, and improve assembly quality and assembly efficiency. This paper summarized the principles of error-proofing design for diesel engine assembly, and introduced the typical types of parts and error-proofing requirements related to error-proofing requirements in detail. Finally, several cases of error-proofing design of thrust plate were introduced, and the application of error-proofing technology was further explained. References | Related Articles | Metrics

Select

Test of Exhaust Backpressure Influence on Vehicle Fuel Economy LI Haihui 2022, 47(22): 88-91.  DOI: 10.16638/j.cnki.1671-7988.2022.022.018 Abstract ( )   PDF (1646KB) ( )   Exhaust system is an important part of engine accessories, the size of exhaust backpressure directly affects the pump gas loss and thermal efficiency of diesel engine, thus affecting the vehicle fuel economy performance. In this paper, the variation trend of engine power and fuel consumption rate with the increase of exhaust backpressure was measured under rated working conditions through diesel engine bench test. The simulation model of truck was built in AVL CRUISE software, through the influence curve of exhaust backpressure on vehicle economy, the optimization direction of exhaust system is given. References | Related Articles | Metrics

Select

Reliability Design of Common Faults in Alternator CHEN Sichao 2022, 47(22): 92-95.  DOI: 10.16638/j.cnki.1671-7988.2022.022.019 Abstract ( )   PDF (2718KB) ( )   Alternator is an automobile power supply component, and its reliability is the key research object. This paper focuses on the problem of non-generation and abnormal noise in the aftermarket, first introduce the external reasons, low battery voltage, abnormal line connection, insufficient belt tension. Then the reliability design is made for muddy water inflow the alternator, failure of electronic components, bearing electric corrosion noise, durable noise of AID. It has been proved that the improved alternator performs well in the aftermarket. References | Related Articles | Metrics

Select

Analysis on Seat Comfort Design of City Bus JIANG Xiaoxu 2022, 47(22): 96-101.  DOI: 10.16638/j.cnki.1671-7988.2022.022.020 Abstract ( )   PDF (1348KB) ( )   This paper introduces the concept of comfort to study and analyze the comfort of bus seats and discusses the seat comfort from the two aspects of physiological comfort and psychological comfort, investigates and analyzes the uncomfortable feeling of bus seats when people take a bus, and probes into the factors that may affect seat comfort. In the study, ergonomics related knowledge is used to study and analyze the application of human body size in seat size from a scientific point of view, and the level of psychological comfort is analyzed through the introduction of Maslow's demand model. Factors affecting the seat comfort of subjective and objective evaluation, subjective assessment scale, selected percentile human body 5%～95% reviewers questionnaire investigation, and summarizes the key factors influencing the seat comfort, cushion pressure distribution experiments, analysis of posture to chair the body pressure distribution, to verify the result of subjective evaluation is reasonable. The data show that the height of seat and chair surface has a great influence on comfort, which is unified with the subjective evaluation results, and the subjective and objective evaluation results are in good consistency.The evaluation index is reasonable, which provides a deeper understanding of the factors affecting seat comfort, and provides a direction for subsequent research. References | Related Articles | Metrics

Testing and Experiment

Select

Vehicle Load Spectrum Acquisition Based on Vehicle Proving Ground ZHU Huaifeng 2022, 47(22): 102-107.  DOI: 10.16638/j.cnki.1671-7988.2022.022.021 Abstract ( )   PDF (5284KB) ( )   In order to collect the load spectrum data of an sport utility vehicle(SUV)model in the automobile test field, a number of six-component force sensors, acceleration sensors and displacement sensors are installed on the vehicle, and strain gauges are pasted on the chassis suspension parts and the body position, and are marked as strain gauges. The sensor is connected to the data acquisition system to record the load changes when the vehicle drives over the reinforced durable pavement of the automobile test field. By processing the collected raw data, such as drift removal, it is convenient for later statistical analysis and calculation verification. This paper expounds the process of calibration and production of strain gauge sensors and the general scheme of load spectrum acquisition. Combined with long-term practical experience, the main points of concern and the troubleshooting methods for common faults are named, so as to provide a reference for the development of related tests. References | Related Articles | Metrics

Select

Research and Optimization of Air Condition Compressor Noise Problem for a Certain Model under the Idle Speed AI Honggen 2022, 47(22): 108-112.  DOI: 10.16638/j.cnki.1671-7988.2022.022.022 Abstract ( )   PDF (2072KB) ( )   In a certain model, under the condition of idling and turning on the air conditioning compressor, the car appeared obvious low frequency noise. When the air conditioning compressor was turned off, the noise disappeared. Through the collection of the vibration and noise data, data post-processing and filter playback analysis, it was confirmed that the low frequency noise in the car was from the compressor. Through the hardware analysis of air conditioning system, investigation and rectification verification, it was confirmed that the pressure pulsation of the refrigerant in the compressor suction and exhaust lines was the key factor. Finally, a plan to increase the expansion chamber in the compressor exhaust pipe, and reduce the inner diameter of suction pipe was confirmed. The subjective interior noise optimization was obvious. The objective data showed that the main order noise of the compressor in the car was reduced by 10.1 dB(A). References | Related Articles | Metrics

Select

The Factors of Tire Pressure Detection and Optimization Methods YU Xiaolei 2022, 47(22): 113-117.  DOI: 10.16638/j.cnki.1671-7988.2022.022.023 Abstract ( )   PDF (2100KB) ( )   This paper mainly discussed the optimization of tire pressure detection methods in actual operation, and improved the success rate and accuracy rate of the system in reading tire pressure information. By studying the principle of tire pressure detection and the process of detecting tire pressure information operation in the production line, the main factors affecting its success rate and accuracy rate were deeply analyzed. It was mainly discussed from several aspects, such as tire pressure detection process, key sensor layout, equipment working status, and personnel operation process. The risk points that need to be paid attention to in each link and how to optimize them were expounded. It aimed to provide suggestions for the production line to better detect tire pressure and read information through the connection between theory and practice, combined with actual production experience. References | Related Articles | Metrics

Select

Research on the Control of Automotive Electronic Brake Test Bench Based on CANopen LI Zhanqi 2022, 47(22): 118-123.  DOI: 10.16638/j.cnki.1671-7988.2022.022.024 Abstract ( )   PDF (1461KB) ( )   In order to improve the electrical connection and control independence of the bench, aiming at the integration requirements of the brake hydraulic test bench for the Hardwarein-the-loop simulation test of the electronic brake control system in the intelligent chassis, the control of the test bench based on CANopen communication mode is proposed. The object dictionary of CANopen communication sub-protocol, servo sub-protocol and the format of CANopen communication message are analyzed. The conversion relationship between each state of servo driver and the setting of Process Data Object (PDO) mapping message in three modes of position, speed and torque are detailed. Using the HIL simulator, servo driver and electronic cylinder based on CANopen communication and closed loop control in three modes of position, speed and torque based on Matlab/Simulink. The test results show that the control of servo electric cylinder is fast response, high repeatability, high precision by using CANopen communication. By relating the brake pedal signal with the vehicle dynamic model, the user can achieve a variety of complex conditions on test bench. References | Related Articles | Metrics

Select

Fatigue Load Spectrum Research of Transmission and Simulation Test Verification QIAO Yingmin 2022, 47(22): 124-128.  DOI: 10.16638/j.cnki.1671-7988.2022.022.025 Abstract ( )   PDF (2120KB) ( )   This paper discussed in detail the current situation of fatigue endurance test load spectrum of automotive transmission bench at home and abroad, introduced the rotating rain flow counting method and the damage equivalent theory, and on this basis, extracted the fatigue life test load spectrum from the original data of construction machinery shovel loading and driving conditions measured in the test field through gear segmentation, data processing and transformation. The load was used as the input of design life, and the design life of the transmission can be calculated and checked in the research and design stage. At the same time, the load spectrum was also used as the load spectrum of the bench fatigue endurance test to verify the fatigue test of the transmission prototype. It ensured the consistency between the load spectrum of design fatigue and the load spectrum of bench fatigue endurance test, and can also truly reflect the actual working load condition of the construction machinery. References | Related Articles | Metrics

Select

The Research of Test Method of ESC System on Ice Snow Covered Pavement DONG Xiaofei 2022, 47(22): 129-133.  DOI: 10.16638/j.cnki.1671-7988.2022.022.026 Abstract ( )   PDF (1359KB) ( )   The electronic stability controller (ESC) system is one of the most important active safety technologies in the automotive industry in the last decade. The system can greatly improve the stability of the vehicle under some extreme driving conditions. However, due to the poor consistency of the vehicle test on snow and ice surface conditions, there are few tests on snow and ice surface for electronic stability controller system. In this paper, a typical test method of double line shifting under snow and ice surface is selected, and a large number of repeated tests are carried out under snow and ice surface. Through the analysis of data collection, we try to find out the main influencing factors and influencing rules of test consistency. From the data results, it is found that the operation error of the pilot is the main factor affecting the consistency of the test. Only after excluding this influencing factor can we further study the influence of natural conditions such as temperature, humidity and wind speed on the test results. In this case, it is an effective method to improve the consistency of the test by using robot operation and improving the driver's skills. References | Related Articles | Metrics

Select

Analysis of the Problem of Booming in the Cabin During the Acceleration Process of SUV ZHAO Haidong 2022, 47(22): 134-138.  DOI: 10.16638/j.cnki.1671-7988.2022.022.027 Abstract ( )   PDF (1915KB) ( )   This paper mainly studied the booming in the vehicle of sport utility vehicle during acceleration, so as to solve the problem of booming in the cabin. Through systematic investigation: it is confirmed that it is caused by the noise of the air intake system by subjective evaluation. Through the verification of the vehicle, the booming is strongly related to the noise of the air intake system in the vehicle. Therefore, it is verified by changing the acoustic mode of the intake pipe and adding resonator to the intake system. After the road test, the measures of lengthening the intake system pipeline has the best effect on mitigating noise. The subjective evaluation is acceptable, the booming can be reduced by 6.4 dB (A) in the cabin, and the related performance are also within the acceptable range. This paper can solve such problems by changing the acoustic mode of the intake pipe and sum up the causes of such problems troubleshooting methods and solutions. References | Related Articles | Metrics

Process and Equipment

Select

Kinematics Analysis and Simulation of Industrial Robot Based on IRB1410 DI Ruxia 2022, 47(22): 139-143.  DOI: 10.16638/j.cnki.1671-7988.2022.022.028 Abstract ( )   PDF (1324KB) ( )   Aiming at the problems of pose transformation calculation, model establishment and students' understanding in industrial robot teaching for vocational undergraduates. Taking IRB1410 robot as the research object in the aspect of spatial motion analysis of robot, this paper theoretically establishes the D-H coordinate system of the robot, writes the parameter table as the key data of modeling, deduces the kinematics model of the robot, and verifies the accuracy of the model through MATLAB software simulation. The model of this paper provides some methods and ideas for the teaching theory and practical operation of vocational undergraduate. References | Related Articles | Metrics

Select

The Major Problems and Solutions of Valve Lock Clamp Detection NIE Canming 2022, 47(22): 144-149.  DOI: 10.16638/j.cnki.1671-7988.2022.022.029 Abstract ( )   PDF (2080KB) ( )   According to the working principle of the engine, the body of the valve lock clamp is small in terms of design. The size of the valve lock clamp of the ordinary commercial engine is about 5 mm×5 mm×2 mm circular arc alloy small pieces. In addition to the difficulty of assembly, how to detect whether it has been installed is also a relatively important link. This paper analyzed the working principle and process of engine valve lock clamp detection equipment often used in the field production process, took the actual situation as an example, and used the three dimensional mathematical model analysis. The limit value setting method of the device and graphical curves under different failure modes were studied and analyzed, and the field engineering and technical personnel can compare the graphical curves, which can quickly find the equipment failure points or product failure points, so as to quickly resume production and improve the capability of online quality detection. References | Related Articles | Metrics

Automobile Education

Select

Research and Practice on Diversified Evaluation System of Automobile Students in Higher Vocational Colleges under Integration of Production and Teaching WANG Jianfeng 2022, 47(22): 150-154.  DOI: 10.16638/j.cnki.1671-7988.2022.022.030 Abstract ( )   PDF (1110KB) ( )   The integration of industry and education is the integrated development of the whole process of industry, industry, enterprise and vocational education, teaching and research, which is based on the needs of enterprises and employment oriented personnel training. Under the background of the integration of industry and education, the traditional student evaluation method cannot objectively reflect the overall quality and ability of students, nor can it fully reflect the characteristics and advantages of the integration of industry and education. Based on the integration of production and teaching, this paper analyzes the connotation and construction principles of the evaluation system for higher vocational students, took the automobile inspection and mainte- nance technology and new energy automobile technology majors of our college as examples, the diversified evaluation system of automobile students in higher vocational colleges under the background of integration of industry and education is constructed, made the evaluation system for higher vocational students more scientific, and promoted the talent training mode of the integration of production and teaching and the joint construction of schools and enterprises to further develop. References | Related Articles | Metrics

Select

Application of Formative Assessment in the Course of Automobile Chassis Construction and Maintenance LI Wei 2022, 47(22): 155-158.  DOI: 10.16638/j.cnki.1671-7988.2022.022.031 Abstract ( )   PDF (1141KB) ( )   Curriculum assessment is the baton of curriculum construction and classroom teaching, and formative assessment plays a guiding role in the development of high-quality education and the cultivation of high-quality talents. This paper was student-centered, and combined with the learning pass platform. In the course of automobile chassis construction and maintenance, based on the project-based design, task driven learning, and hybrid teaching, the ideological and political goals of the course were added, and formative assessment was integrated into the teaching process, forming an application scheme of formative assessment. By carrying out formative assessment, we can enrich online curriculum resources and improve the utilization rate, help students form good learning methods and teachers optimize teaching strategies, achieve good results in curriculum teaching, and achieve teaching objectives. References | Related Articles | Metrics

Select

Construction of Engineering Project Management Course with the Integration of Ideological Factors WANG Xu 2022, 47(22): 159-162.  DOI: 10.16638/j.cnki.1671-7988.2022.022.032 Abstract ( )   PDF (1012KB) ( )   Due to requirements of the course ideological and political, and considering the opinions of first-class undergraduate curriculum construction, the article describes the path of construction of project management course for vehicle engineering majors. The teaching objectives and education objectives are formulated. And the lecturers' philosophy of politics is enhanced to realize the importance and necessary of ideological and political education into professional education. As specialist knowledge is explained, ideology and politics are smoothly promoted. Then the theoretical knowledge of engineering project management is continuously updated as Project Management Body of Knowledge (PMBoK); Moreover, case-based teaching, project-driven and other traditional teaching methods are comprehensively used for student centered. Especially for the stage evaluation, the assessment methods are developed throughout the whole lecture cycle. Also, it is actively practiced to cultivate engineers with engineering management skills for the automotive industry. References | Related Articles | Metrics

Select

Discussion on “Theoretical learning” and “Practical Exercise” in Automobile Teaching MAO Qiyuan 2022, 47(22): 163-166.  DOI: 10.16638/j.cnki.1671-7988.2022.022.033 Abstract ( )   PDF (1133KB) ( )   The key to teaching is how to make the teaching of automobile professional courses more practical and standardized. By analyzing the four points of "5S on-site management" and "truth and falsehood of basic theory" in the teaching of automobile specialty, as well as "reality" in the practical operation of "standardized use of tools" and "standardized inspection and disassembly", this paper briefly discusses how to cultivate students' professional general quality and ability in the teaching of automobile specialty. Through these four points, we can develop normative consciousness，grasp the details of theory and practical teaching, and achieve thorough study of "basic theory" and" practical practice", so as to lay a solid foundation and broaden students' growth space. References | Related Articles | Metrics

Standards Regulations Management

Select

Subjective Evaluation and Analysis of Vehicle Performance of a Pure Electric Passenger Car under “High-Cold, High-Hot and High Altitude” Environment HE Junnan 2022, 47(22): 167-171.  DOI: 10.16638/j.cnki.1671-7988.2022.022.034 Abstract ( )   PDF (1190KB) ( )   The “high-cold, high-hot and high-altitude” environmental adaptability test of the whole vehicle is very important in the process of vehicle test development and verification, and it is an indispensable test link. In this paper, a pure electric passenger car is selected. Referring to the standard T/CSAE 163—2020, its performance under the “high-cold, high-hot and high-altitude” environment is comprehensively analyzed by subjective evaluation, and the advantages and disadvantages of product performance are summarized. From the analysis of the evaluation results, it can be seen that the performance of this vehicle is relatively balanced under the "high-cold, high-hot and high-altitude" environment, but there are still some key problems, such as sudden locking of the vehicle screen, no numerical display of the tire pressure alarm, high power consumption in the high-cold environment. References | Related Articles | Metrics

Select

Analysis of the Influence of Driving Style on Traffic Accidents WANG Hongxia 2022, 47(22): 172-175.  DOI: 10.16638/j.cnki.1671-7988.2022.022.035 Abstract ( )   PDF (1216KB) ( )   With the rapid increase of car parc, traffic accidents occur frequently. The main cause of accidents is related to the driving behavior of drivers. For drivers, their driving behavior can be expressed as driving style. By means of questionnaire, this paper analyzed the influencing factors of driving style of passenger car drivers and the relationship between driving style and traffic violations and accidents. The results of data analysis showed that driving style was influenced by gender, age, driving experience and education level. There was a high correlation between drivers' traffic violations and accidents and their driving styles of risk-taking, anger, distraction and anxiety. Drivers with safe driving styles have a relatively low probability of accidents. The measurement of driver's driving style can help to evaluate the driver's competence and take appropriate intervention measures to reduce the occurrence of traffic accidents from the driver level. References | Related Articles | Metrics

Select

Exploration and Application of Virtual Verification in Vehicle Commodity Evaluation YI Ensi 2022, 47(22): 176-180.  DOI: 10.16638/j.cnki.1671-7988.2022.022.036 Abstract ( )   PDF (1702KB) ( )   Vehicle commodity evaluation can play an important role in the early stage of vehicle research and development. Based on a series of virtual reality technologies and combined with a multi-dimensional adjustable semi-physical stand, a virtual verification platform was built to realize the one-to-one mapping between real space and virtual space, and between real human body and virtual human body. In the data phase of product development, the digital model is visualized as a Digital Mock-Up, the commercial evaluator performs subjective evaluation and verification analysis on the typical static scene of the Digital Mock-Up from the user's perspective by wearing motion capture device. In front of the physical sample vehicle, product design problems such as the perceived quality of interior and exterior decoration, human-machine space and usability, and maintenance convenience are discovered. Through the pilot verification of several products under development, the results show that the virtual evaluation of vehicle commodity can make the early verification of product research and development more efficient, more sufficient and lower cost. Based on this, the paper puts forward the application deepening direction of virtual verification in the evaluation of vehicle commodity, which has a strong reference significance for product verification practitioners. References | Related Articles | Metrics

Overview

Select

Overview of Mixed Vehicles Including Intelligent Connected Vehicles Passing Through Signalized Intersections CHEN Baojie 2022, 47(22): 181-184.  DOI: 10.16638/j.cnki.1671-7988.2022.022.037 Abstract ( )   PDF (931KB) ( )   Signalized intersection is an important part of the urban roads. When the traffic flow is large, vehicles may experience congestion and delays, reducing the capacity of the road. The development of intelligent connected technology provides a new idea for us to study how to improve the efficiency of intersection. This article introduced the current research status of vehicles at intersections and the application of intelligent vehicles at signalized intersections. The other scholars' research on speed control strategies for mixed vehicles at signalized intersections and optimization research on mixed vehicles at signalized intersections were reviewed. The vehicle trajectory optimization, signal timing and space optimization of mixed traffic flow with intelligent connected vehicles were summarized. The research direction of mixed vehicles at signalized intersections was prospected. References | Related Articles | Metrics

Select

Overview of Traffic Accident Prediction Based on Vehicle Accident Data MA Bintao 2022, 47(22): 185-189.  DOI: 10.16638/j.cnki.1671-7988.2022.022.038 Abstract ( )   PDF (1294KB) ( )   The relationship of various influencing factors in the process of traffic accidents is implied in the historical data of traffic accidents, and the conclusion of using data analysis can be used as a theoretical basis for road traffic safety management and traffic safety education, and provide scientific support for the proposal of related policies. This paper reviewed the research on traffic accident prediction based on vehicle accident data. Firstly, the basic process of road traffic accident prediction was introduced. Secondly, the main models used by domestic and foreign scholars in accident data prediction were highlighted. Thirdly, the advantages and shortcomings of these main models were compared and the gray prediction was used for accident prediction case studies. Finally, the future development trend of predicting traffic accidents with data was prospected. References | Related Articles | Metrics

Select

Development Status and Prospect of Plastic Engine Intake Manifold LIANG Shusheng 2022, 47(22): 190-193.  DOI: 10.16638/j.cnki.1671-7988.2022.022.039 Abstract ( )   PDF (931KB) ( )   Compared with the traditional aluminum alloy engine intake manifold, the plastic engine intake manifold is not only greatly reduced in weight, but also significantly improved in engine dynamic performance and manufacturing costs. However, as a key component of engine intake system, the engine intake manifold has high requirements on material selection and processing craft due to its complex structure. This paper mainly explores the state-of-the-art development status and prospect of plastic engine intake manifold on its material and technological process processing craft in the world, aiming at predicting the development direction of plastic engine intake manifold in the future, promoting independent research in domestic, and mastering its core technology of production and processing, so as to accelerate the progress of domestic plastic engine intake manifold. in order to supply referring information for the profession personnel. References | Related Articles | Metrics