Archive

15 November 2022, Volume 47 Issue 21 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

Ride Comfort Analysis of Pure Electric Bus Based on Smart Phone MA Wanliang 2022, 47(21): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2022.021.001 Abstract ( )   PDF (1044KB) ( )   In order to study the common problem of "carsickness" in the operation of pure electric bus, this paper uses smart phones as data acquisition equipment to collect the second by second operation data of 82 drivers on 10 lines. The bus operation process is divided into three stages: acceleration, uniform speed and deceleration. The analysis shows that 49.6% and 30.8% of the instantaneous acceleration in the acceleration and deceleration stages respectively exceed the comfort threshold, which will make passengers feel uncomfortable. At the same time, the speed stability in the uniform stage is far lower than that of social vehicles. In addition, in order to study the relationship between driving style and ride comfort, drivers are divided into three categories by using spectral clustering algorithm based on vehicle operating parameters. The analysis shows that the more aggressive the driving style is, the stronger the ride discomfort will be. Through the decomposition of the bus operation process and the effective clustering of drivers, it can provide theoretical guidance and data support for improving the riding comfort of pure electric bus, the evaluation of operation service quality, and the targeted improvement of drivers' driving skills. References | Related Articles | Metrics

Select

Design and Investigation on the Performance of Separation Type Power Battery Thermal Management System QIU Jieyu 2022, 47(21): 7-11.  DOI: 10.16638/j.cnki.1671-7988.2022.021.002 Abstract ( )   PDF (1086KB) ( )   Thermal management system has a crucial influence on the performance of electric vehicle power battery system. Effective thermal management system can improve the working environment of power battery, make the power battery work in the best temperature, and ensure the driving performance and driving safety of electric vehicle. Aiming at the problems existing in the current power battery thermal management system, this paper designs a separate battery thermal management system assisted by heat pipe, and carries out a parametric numerical simulation of the proposed battery thermal management system. The results show that the phase change temperature plays an important role in controlling the temperature of the battery. The high thermal conductivity of the phase change material makes the composite phase change material strengthen the heat dissipation of the battery pack well, but when the thermal conductivity increases to a certain degree, the downward trend of the battery temperature tends to be gentle. High convective heat transfer coefficient is beneficial to release latent heat of phase change materials and improve the utilization rate of phase change materials, but high convective heat transfer coefficient can not further improve the performance of the system, and will lead to cost increase and other problems. References | Related Articles | Metrics

Select

Low Temperature Range Improvement Method of Pure Electric Vehicles LI Hui 2022, 47(21): 12-18.  DOI: 10.16638/j.cnki.1671-7988.2022.021.003 Abstract ( )   PDF (1320KB) ( )   In order to solve the problem of the sharp decline in the low temperature cruising range of pure electric vehicles, this paper proposes a solution to increase the cruising range from the perspective of thermal management based on the energy consumption characteristics of lithium iron phosphate battery models in the low temperature endurance test of the EV-Test. Using battery driving heating and motor waste heat recovery, and using KULI and Cruise software joint simulation analysis and real vehicle test to compare and analyze the two schemes, it is confirmed that the effect of the motor waste heat recovery scheme is more obvious, the low temperature endurance is actually increased by 47 km, and the low temperature attenuation rate is reduced by 11%. The scheme of motor waste heat recovery has good universal applicability. References | Related Articles | Metrics

Select

Equivalent Method and Modal Analysis of Stator System Model of Permanent Magnet Synchronous Motor WANG Chao 2022, 47(21): 19-24.  DOI: 10.16638/j.cnki.1671-7988.2022.021.004 Abstract ( )   PDF (1149KB) ( )   In order to accurately predict the modal characteristics and natural frequencies of the stator system of the motor, in this paper, an equivalent method of permanent magnet synchronous motor stator system model is proposed and its modal analysis is carried out. Firstly, the stator core and winding model are established by finite element methods, and an anisotropic material attribute is set. Then, the naturalt frequency of the stator core and the windings is obtained by simulation, and modal analysis is performed. Finally, the accuracy of the equivalent method of the stator system model is verified using hammer method modal test. This article provides a new equivalent analysis method for the modal analysis of the motor stator system, and improves the calculation accuracy. References | Related Articles | Metrics

Select

Range of Battery Electric Vehicle and Analysis of Influencing Factors TANG Baolong 2022, 47(21): 25-31.  DOI: 10.16638/j.cnki.1671-7988.2022.021.005 Abstract ( )   PDF (1873KB) ( )   Range is one of the key considerations for customers to purchase battery electric vehicles, and increasing range is also a key technical target for manufacturers. By understanding the composition and principle of battery electric vehicles, based on the basic theory, the factors affecting the range from system of motor and control system and battery to the whole vehicle were analyzed and summarized. Combined with the commonly used test conditions, the level of influence of various factors on the range and energy consumption rate was analyzed. Finally, the key work contents of the range development of battery electric vehicles in the simulation stage and the real vehicle verification stage were shown by examples, which could provide an important reference for the development of battery electric vehicles in the future. References | Related Articles | Metrics

Select

Energy Consumption Prediction and Driving Range Research of Electric Vehicle YANG Wenhua 2022, 47(21): 32-36.  DOI: 10.16638/j.cnki.1671-7988.2022.021.006 Abstract ( )   PDF (1656KB) ( )   The endurance of pure electric vehicle is directly related to the energy consumption level of the electric drive system. Energy flow analysis of the vehicle is a necessary means to improve the development of pure electric technology. In this paper, the theoretical energy consumption of the electric drive system was deduced based on the road load coefficient of the vehicle, and the energy consumption performance of different models under china light-duty vehicle test cycle-passenger (CLTC-P) conditions at room temperature, high temperature and low temperature was teted and compared. Then, the energy consumption level of the electric drive system of the vehicle was predicted according to the deviation between the theory and practice. At the same time, the corresponding relationship between the range performance of each vehicle under different test conditions, the real power and the meter display power, the remaining range of the meter display power and the state of charge of the meter display power are analyzed, which provides reference for the optimization and development of the vehicle display control strategy. References | Related Articles | Metrics

Intelligent Connected Vehicle

Select

A Traffic Light Recognition Method Based on Prior Information ZENG Yangfan 2022, 47(21): 37-42.  DOI: 10.16638/j.cnki.1671-7988.2022.021.007 Abstract ( )   PDF (1701KB) ( )   To solve the problem of low accuracy of color-based traffic light recognition (TLR), a TLR method that combines HSV (Hue, Saturation, Value) color space and gray image information is proposed. First, image tilt correction and size standardization is needed to meet the needs of the proposed fusion traffic light recognition method. Then, the RGB (Red, Green, Blue) images are converted into HSV (Hue, Saturation, Value) color space to initially recognize the state of traffic light. The boundaries of traffic lights is extracted by hough line detection, and region of interest (ROI) detection is realized. Considering that some traffic light images cannot be recognized by HSV (Hue, Saturation, Value) color space method, and the structure characteristics of the traffic light are used as the prior information, and the region of interest pixel values of the gray image is summed to further identify the state of traffic light. The fusion traffic light recognition method is evaluated through experiments and compared with the methods that separately use HSV (Hue, Saturation, Value) color space and gray image region of interest pixel values summation to evaluate the performance of the proposed algorithm. References | Related Articles | Metrics

Select

Driverless Vehicle Trajectory Tracking Algorithm Based on MPC CUI Zhen 2022, 47(21): 43-46.  DOI: 1671-7988-47-21-37.pdf Abstract ( )   PDF (809KB) ( )   Based on the kinematics model of three-degree-of-freedom vehicle, a trajectory tracking control algorithm was designed for the driverless vehicle with front-wheel steering, and the vehicle trajectory tracking state equations were established. The model predictive control algorithm was used to achieve optimal control of the driverless vehicle through roll optimization and feedback correction. In order to verify the effectiveness of the kinematics model and the algorithm, the kinematics model was simulated and analyzed, and a Carsim-Simulink co-simulation platform was established to conduct simulation experiments on linear trajectories and circular trajectories respectively. The simulation results showed that the kinematics model and the algorithm can effectively track the trajectory of the driverless vehicle. References | Related Articles | Metrics

Select

Development of Intelligent Clutch System for a Light Truck YANG Yunhui 2022, 47(21): 47-52.  DOI: 10.16638/j.cnki.1671-7988.2022.021.009 Abstract ( )   PDF (3613KB) ( )   Starting from the technical development background of intelligent clutch system, this paper introduces the technical advantages of intelligent clutch system. According to the early technical route and application situation, this paper expounds the difficulties of developing intelligent clutch system for light truck application. According to the working conditions and environment of light truck, the technical principle and scheme of the development of light truck intelligent clutch system are expounded. And design the main functions of intelligent clutch system. Propose specific technical solutions from the difficulties of truck development. After calibration verification and subjective evaluation, the established development function and performance objectives are achieved. The development and application of intelligent clutch system on a light truck is realized. Completely liberate the driver’s left foot, solve the fatigue caused by frequent stepping on the clutch pedal, and let the driver enjoy the fun of manual shifting. According to the future application and development trend of intelligent clutch system, it can be predicted that intelligent clutch system will become an important part of intelligent driving and assisted driving. References | Related Articles | Metrics

Design and Research

Select

Design and Realize of Cylindrical Cam Parametric Design System Based on CATIA ZHANG Jutao 2022, 47(21): 53-58.  DOI: 10.16638/j.cnki.1671-7988.2022.021.010 Abstract ( )   PDF (1488KB) ( )   Based on the theory of establishing the parameter equation of cam profile curve, this paper re-developedCATIA, with the object-oriented program of Automation technology and the cam profile curve generated by the CATIA curve function. The re-development adopted a variety of function modules of VB language and used CATIA as parameter design platform with the design process of macro recording command to record the design process of spacecam and extracting macro program. The developed system can carry out parametric design of parts without starting CATIA, it can improveboth the design precision and the design efficiency. References | Related Articles | Metrics

Select

Synchronous Flash Multi-type Controller Method ZHOU Shenghui 2022, 47(21): 59-63.  DOI: 10.16638/j.cnki.1671-7988.2022.021.011 Abstract ( )   PDF (1032KB) ( )   New energy vehicles have the characteristics of many controllers and fast program update speed. In order to solve the problem of timely updating the program of the controller of the off-line vehicle of the vehicle manufacturer, this paper expounded a method of developing host computers based on C++. By the method of increasing channel selection window of the host computer, using the same host computer to open different windows and select different channel settings, multi-type controllers can be flashed synchronously, and the functions of automatic recognition and automatic flashing again, monitoring and flashing data, and automatic reset controller re-flashing can be realized after replacing the hardware, which greatly reduced the time cost and labor cost of the vehicle manufacturer to upgrade the controller for the off-line vehicle. References | Related Articles | Metrics

Select

Design and Development of Remote On-line Monitoring System for Intake Pressure of Automotive Diesel Engine PANG Chengli 2022, 47(21): 64-67.  DOI: 10.16638/j.cnki.1671-7988.2022.021.012 Abstract ( )   PDF (2309KB) ( )   Automotive diesel engine inlet pressure remote on-line monitoring device design and development of belong to the category of auto monitoring device field, in the process of automotive diesel engine assembly thermal test, concept design remote monitoring machine operation parameters such as inlet pressure, by monitoring the pressure before and after the measure of intercooled diesel engine parameters, provides the basis for judgment for diesel engine fault. At the same time, the design scheme can reduce the waste caused by replacing the supercharger in the production process and improve the efficiency of the bench. And the measurement process does not need to enter the test room to read data, remote control, to ensure the operator's personal safety. On the basis of ensuring safe and reliable operation of diesel engine thermal test, this design scheme can scientifically reduce cost and improve efficiency. References | Related Articles | Metrics

Select

Study on Dimension Matching of Interior and Exterior Decoration about Heavy Truck Cab CHEN Zeyan 2022, 47(21): 68-72.  DOI: 10.16638/j.cnki.1671-7988.2022.021.013 Abstract ( )   PDF (2077KB) ( )   With the localization of foreign capital heavy truck and the new force of domestic heavy truck, the competition of heavy truck is becoming more and more fierce. As dimension engineers, we should do our best to do a good job of dimension matching, so as to enhance the product appearance quality competitiveness. Through the problems of gap & flush and assembly in the dimension matching of interior and exterior decoration of a heavy truck cab, this paper analyzed and reflected on visual perception, datum, dimension chain, checking fixture, dimension flow and so on. The conclusions are as follows: the quality of pre-dimensional synchronization work, such as style seaming, datum and structure synchronization, has a great influence on the dimension matching. Therefore, only if the pre-dimensional synchronization work is done well, the dimension matching work can be carried out smoothly, so as to rapidly improve the appearance quality level of heavy truck cab and enhance product competitiveness. References | Related Articles | Metrics

Select

Analysis on Design Method and Application of Anti-corrosion Structure of Automobile Body FENG Wancun 2022, 47(21): 73-80.  DOI: 10.16638/j.cnki.1671-7988.2022.021.014 Abstract ( )   The corrosion of automobile body has become one of the key problems that people pay more and more attention to, so it is necessary to improve the anti-corrosion performance of automobile body. Based on the analysis of the causes of sheet metal corrosion caused by improper automobile structure design, this paper expounded the design methods to improve the anti-corrosion performance of automobile body from the aspects of body anti-corrosion structure design steps, electrophoresis, drainage, wet area sealing, body anti-stone impact and so on. Thus, automobile workers can effectively ensure the overall anti-corrosion performance of the vehicle body at the beginning of vehicle model design, improve product quality, and reduce the cost of later mold design change and process verification. References | Related Articles | Metrics

Select

Driving Safety and Temperature Control Calculation of an Electric Power Communication Command Vehicle NI Jun 2022, 47(21): 81-85.  DOI: 10.16638/j.cnki.1671-7988.2022.021.015 Abstract ( )   PDF (1304KB) ( )   To study the driving safety and temperature control accounting of the electric communication command vehicle is to ensure the driving ability of the modified command vehicle while taking into account the comfort of the inner working space. In this paper, the whole design process of running safety and temperature control accounting of an electric communication command vehicle is described based on the theoretical calculation and the whole vehicle performance test. The reasonableness of the preliminary design is verified by the test of the vehicle's reassembly performance, which provides a design reference for the whole vehicle stability design of this kind of medium communication command vehicle, and also provides a reference for the performance design of special vehicle refitting. Electric communication command vehicle is an advanced emergency communication equipment. The vehicle running safety and temperature control accounting in the product design stage are the necessary prerequisites to ensure the realization of basic functions of the command vehicle, which has important research significance. References | Related Articles | Metrics

Select

Research and Optimization of Sound Problem of Front Bushing of Front and Bottom Control Arm of a Vehicle DENG Lizhong 2022, 47(21): 86-90.  DOI: 10.16638/j.cnki.1671-7988.2022.021.016 Abstract ( )   PDF (1653KB) ( )   A vehicle continuously passed through speed bumps at a low speed of 10km/h～25km/h after wading in the car body. As the front wheels were lifted, when the front suspension of the vehicle was pulled up by force, a "crunch" sound similar to rubber squeeze can be clearly perceived in the front position. The higher the speed, the more pronounced the sound. After the sound appeared, drive continuously on a bumpy road for about 1km, and the sound would slowly become smaller until it disappeared. However, when the vehicle passed the road in the same condition without wading in water, the sound can not appear. By temporarily modifying the contact position between the bushing and rubber in front of the bushing of the faulty part, the wire was added to increase its interference amount, and it was confirmed that the abnormal sound was caused by the change of friction relationship with the inner casing of the bushing after the rubber wading on the front bushing of the swing arm, resulting in abnormal extrusion slip. The structural analysis, investigation and rectification verification of the front suspension system were carried out to confirm the key factors of abnormal sound caused by the interference between the inner casing of the front swing arm bushing and the flanging rubber. Finally, it was confirmed that the scheme of changing the structure of swing arm bushing from the original structure with flanging rubber to the structure with flange plane was evaluated in batches subjectively, and no abnormal sound was found. References | Related Articles | Metrics

Select

Lightweight Design of Air Suspension Structure of a Tractor SHEN Guowei 2022, 47(21): 91-96.  DOI: 10.16638/j.cnki.1671-7988.2022.021.017 Abstract ( )   PDF (1552KB) ( )   In order to reduce the weight of the air suspension structure of the tractor and verify its strength performance, CATIA was first used to design the lightweight of air suspension system of the tractor, then the finite element model of the air suspension structure was established, and finally a comparative simulation analysis was made on the new and old materials and lightweight structure of some structural parts under different working conditions. The results show that the maximum Von-Mises stress of the optimized model is less than that of the old material. The strength performance can still meet the requirements of use, and the weight is reduced, achieving a lightweight effect and meeting the design requirements. This design improves transportation efficiency, reduces fuel consumption and life cycle operating costs. References | Related Articles | Metrics

Select

Lightweight Design and Optimization of Steering Gear Rocker Arm Shaft of Heavy Commercial Vehicles SONG Jing 2022, 47(21): 97-101.  DOI: 10.16638/j.cnki.1671-7988.2022.021.018 Abstract ( )   PDF (1708KB) ( )   The rocker arm shaft of vehicle steering gear is a very important component in the automobile steering system. It is a security and key component of the automobile system. The rocker arm shaft is composed of one end tooth fan and one end spline, and the motion cycle is reciprocating rotary motion, so the rocker arm shaft will be subjected to certain torque to produce torsional deformation. In order to meet the lightweight requirement, on the premise of ensuring that the shear stress bearing capacity of the rocker arm shaft will not be reduced, it can be realized by cutting off the part of the rocker arm shaft that does not bear the main torque. In this paper, the rocker arm shaft was put into the ANSYS finite element analysis to analyze the force under the limit working condition under the static action, and the lightweight design of the rocker arm shaft was carried out with reference to the topology optimization results. References | Related Articles | Metrics

Select

Mechanical Motion Analysis and DMU Simulation of Automotive Five-link Rear Suspension JIA Weizhen 2022, 47(21): 102-107.  DOI: 10.16638/j.cnki.1671-7988.2022.021.019 Abstract ( )   PDF (1533KB) ( )   This article introduced the structure, mechanical motion principle, suspension motion modeling, and digital mock-up (DMU) model application of the automotive chassis five-link rear suspension. This article analyzed the mechanical motion principle of the automotive five-link rear suspension from a theoretical point of view, calculated the number of components, calculated the number of motion pairs, and calculated the degree of freedom of space. This article detailed the CATIA DMU kinematic modeling process, including input parameters, creating parts, creating constraints, and creating drive simulations. This article used the suspension DMU model to solve the practical problems of automotive chassis design, including checking the clearance of each moving part to prevent part collision interference. Make tire sports envelopes to support body styling. Output the wheel displacement and camber relationship diagram to determine whether the vehicle had excellent kinematic characteristics. Output wheel toe angle and camber adjustment range. Obtain the lever ratio of the movement of the wheel center, spring, and shock absorber, and calculate the load of the suspension part to support the suspension design. This article has a wide application value in the field of automotive design. References | Related Articles | Metrics

Select

Heat Dissipation Improvement of the Clutch for Heavy-duty Vehicle ZHAO Xuan 2022, 47(21): 108-111.  DOI: 10.16638/j.cnki.1671-7988.2022.021.020 Abstract ( )   PDF (1351KB) ( )   During the start of the heavy-duty vehicle, the flywheel and driven plate of the clutch change from a separated state to a fully engaged state. In the separated state, the flywheel of the clutch is driven to rotate by the engine, and the driven plate has no power source. And in the engaged state, as the speed of the driven plate continues to increase, the relative sliding occurs between the driving and the driven part, which will cause the temperature of the pressure plate and the flywheels to rise. If the temperature of the friction surface is too high, it will aggravate the friction lining wear, and will seriously affect the normal operation and service life of the clutch. In this paper, the thermal balance of three clutches with different structures was analyzed, and a better solution to improve the heat dissipation of the clutch was obtained according to the temperature distribution of the thermal balance for the clutch with different structures. References | Related Articles | Metrics

Testing and Experiment

Select

Analysis and Optimization on Vacuum Pump Noise of the Electric Vehicle LIN Sheng 2022, 47(21): 112-117.  DOI: 10.16638/j.cnki.1671-7988.2022.021.021 Abstract ( )   PDF (1752KB) ( )   As an important part of the braking system of electric vehicles, vacuum pumps obtain vacuum by rotating the motor, which is an important source of vibration and noise for electric vehicles. This article is aimed at the noise, vibration and harshness (NVH) problem of an electric vehicle when the vacuum pump is working under braking conditions. Using Test.lab test analysis system to experimentally analyze possible causes, it is finally found that the vacuum pump working frequency and the mounting bracket modal coupling resonance cause the vacuum pump noisy. By optimizing the frequency and dynamic stiffness of the vacuum pump bracket, and improving the vibration isolation rate of the rubber pad, the large noise of the vacuum pump is solved, and the riding comfort of the electric vehicle is improved. References | Related Articles | Metrics

Select

Application of Improved OPAX Method in Identification of Vibration Source in an Electric Vehicle CHEN Ke 2022, 47(21): 118-122.  DOI: 10.16638/j.cnki.1671-7988.2022.021.022 Abstract ( )   PDF (1501KB) ( )   The vibration signal required by the extended transfer path analysis (OPAX) method is the working condition data of the vehicle, but the noise signal is mixed in the experiment, which has a certain impact on the analysis and identification accuracy. To solve this problem, the OPAX method is improved by using empirical mode decomposition threshold noise reduction. Taking an electric vehicle as the research object, the load parametric identification is carried out by using the frequency response function and working condition data, and then the vibration source in the electric vehicle is identified. The results show that under the uniform acceleration condition, the energy absorption effect of the rear mount z direction on the vibration of motor, reducer and other excitation sources is poor. The fitting response of the improved OPAX method is compared with that of the OPAX method, It is found that the fitting response of the improved OPAX method is more consistent with the measured response, which shows that the improved OPAX method can more accurately identify the vibration sources affecting the vibration in the vehicle. References | Related Articles | Metrics

Select

Modeling and Simulation of Different Vehicle Suspension Systems DONG Mingfeng 2022, 47(21): 123-126.  DOI: 10.16638/j.cnki.1671-7988.2022.021.023 Abstract ( )   PDF (1708KB) ( )   Taking 1/4 vehicle suspension as the research object, the differential equations of two degree of freedom vibration models of vehicle passive and active suspension were established according to the principle of dynamics. The road excitation model and suspension model of two degree of freedom for vehicle were built and simulated in MATLAB/Simulink. The effects of active and passive suspension on body acceleration, suspension stroke and wheel dynamic load were compared and analyzed. It was concluded that the active suspension can better reduce the body acceleration and the ride comfort was better than the passive suspension system. The study of active suspension system is of great significance for improving vehicle ride comfort and handling stability. References | Related Articles | Metrics

Select

Dynamic Responsiveness Test and Analysis of Hybrid Electric Vehicles GUO Wencui 2022, 47(21): 127-132.  DOI: 10.16638/j.cnki.1671-7988.2022.021.024 Abstract ( )   PDF (1230KB) ( )   The improvement of vehicle dynamic responsiveness is conducive to the improvement of power level, and is one of the important indicators to improve consumers' driving experience. Some models have sufficient power but poor power response, which seriously affects the driving experience of consumers. Starting from the actual driving scenario with high responsiveness demand of consumers, this paper designed six test conditions for a hybrid electric vehicle, including creep start, in place start, dynamic start, rapid acceleration, kick down downshift and mode switching, and formulated seven responsiveness evaluation indexes and corresponding analysis methods, including creep start response time and in place start response time. From the perspective of consumers' actual use, this paper put forward the responsive indicators that should be paid attention to in the process of dynamic development, so as to improve consumers' satisfaction with the brand. The analysis results show that the dynamic responsiveness of hybrid electric vehicles is affected by the vehicle performance adjustment and power source matching strategy, and the control strategy of releasing the required torque as soon as possible is conducive to the improvement of responsiveness. References | Related Articles | Metrics

Select

Analysis and Solution of Noise Caused by Seat Slide Rail during the Road Test MA Zhaoqiang 2022, 47(21): 133-137.  DOI: 10.16638/j.cnki.1671-7988.2022.021.025 Abstract ( )   PDF (1503KB) ( )   In order to solve the problem of abnormal noise caused by car seat during dynamic evaluation of road test, through the analysis of seat structure, it is found that the clearance between upper and lower rails of seat frame is the main cause of abnormal noise. The paper analyses the main factors influencing this clearance, which are the ball-matching method of sliding rail, the flatness of the surface connecting the sliding rail with side panel and the flatness of the surface connecting the body with the sliding rail. Through quantitative analysis of these three influencing factors, the optimal ball-matching method of sliding rail, control tolerance of flatness of side-plate connecting rail surface and flatness of lower sliding rail connecting body surface are obtained. This scheme effectively solves the problem of abnormal noise and provides some reference for the development design and quality control of seat frame. References | Related Articles | Metrics

Select

Simulation Analysis of Handling Stability of Airport Shuttle Bus Based on Adams ZHANG Yan 2022, 47(21): 138-142.  DOI: 10.16638/j.cnki.1671-7988.2022.021.026 Abstract ( )   PDF (1105KB) ( )   In order to study the handling stability of the airport shuttle bus, in the car module of the software Adams, modify the corresponding parameters, establish six subsystem models of the front and rear suspension system, steering system, front and rear tire system, body system, etc, and form the handling stability analysis model of the airport shuttle bus, and then conduct the handling stability simulation test on the completed vehicle model according to criterion thersholds and evaluation of controllability and stability for automobiles (GB/T 6323—2014). According to controllability and stability test procedure for automobile (GB/T 480—1999), the handling stability of the airport shuttle car is evaluated, and the total evaluation score is 71.13 points, and the evaluation result is qualified, which provides a certain theoretical basis for the study of the handling stability of the airport shuttle bus. References | Related Articles | Metrics

Process and Equipment

Select

Improvement of FAG Hub Bearing Unit Assembly Process for Commercial Vehicles HUANG Zhan 2022, 47(21): 143-150.  DOI: 10.16638/j.cnki.1671-7988.2022.021.027 Abstract ( )   PDF (2016KB) ( )   The main role of hub bearing is bearing, and provides accurate guidance for the rotation of the hub, it bears both axial load and radial load. It has an important influence on vehicle stability, lightweight and intelligence.This paper mainly introduces the process improvement scheme and new indenter design of FAG hub bearing unit in hub assembly. Through the analysis of the common hub structure and FAG hub bearing unit structure, on the premise of meeting the existing assembly process of a company, according to the structural characteristics of the indenter tooling optimization design, respectively from the positioning, assembly direction, operation intensity analysis and improvement, design a new bearing indenter. Finally, the assembly quality of wheel hub assembly is improved, the production efficiency is improved, and the labor intensity of workers is reduced. In the future tooling design, we can learn from the lean production design ideas to design tooling. References | Related Articles | Metrics

Select

Research on the Flatness of Coach Side Skin Based on Six Sigma Method HU Chahui 2022, 47(21): 151-156.  DOI: 10.16638/j.cnki.1671-7988.2022.021.028 Abstract ( )   PDF (1319KB) ( )   The coach side skin is an important part of the apparent quality display of the car body, which is very concerned by manufacturers and customers. This paper takes the improvement of flatness of coach side skin of A coach factory as the research carrier, according to the steps of Six Sigma DMAIC, using Six Sigma tools and methods such as high-level process flowchart, measurement system analysis, variable flow chart, cause-effect matrix, regression analysis to improve the main problems related to flatness in the process of making coach side skin. The flatness of coach side skin was reduced from 3.25 mm to 2.11 mm before improvement, which achieved the target. According to the results, similar problems can be effectively improved by applying Six Sigma steps and methods. References | Related Articles | Metrics

Select

Process Improvement of Replacing Grinding with Turning for Differential Shell XIAO Yaping 2022, 47(21): 157-162.  DOI: 10.16638/j.cnki.1671-7988.2022.021.029 Abstract ( )   PDF (1924KB) ( )   With the rapid development of economy and manufacturing technologies, modern CNC machining has become the basic technology for manufacturing industry to realize automation, flexibility and integrated production. In this paper, the machining scheme of the installation outer circle of the differential housing bearing was changed from traditional grinding to CNC turning. Through the selection and optimization of the process influencing factors such as the clamping and positioning accuracy of the CNC machining tool, the cutting performance of the tool, process and cutting parameters, the machining was carried out automatically with the digital program to eliminate the man-made errors of the operator. The processing shape and dimensional accuracy of the product were improved, and the quality was more stable and reliable. Meanwhile, after the grinding process was combined with the turning process, the resource utilization was improved and the product manufacturing cycle was shortened. Due to the shortening of the process chain and the reduction of the number of equipment, the floor area of the workshop, maintenance cost and line personnel allocation were also decreased, which could reduce the production cost and bring high economic benefits. References | Related Articles | Metrics

Automobile Education

Select

Analysis of the Virtual Simulation Experiment Platform for Lane Keeping on New Energy Vehicles LUO Tian 2022, 47(21): 163-166.  DOI: 10.16638/j.cnki.1671-7988.2022.021.030 Abstract ( )   PDF (1746KB) ( )   According to the talents training needs of emerging engineering education in vehicle engineering, a virtual simulation experiment platform for lane keeping assist and departure warning driving for new energy vehicles was designed. The simulation model of lane keeping and departure warning control based on lane keeping assist control strategy was constructed. The virtual simulation test system of lane keeping information collection based on Carsim was constructed. Combined with the driving simulator, the simulation test of lane keeping and departure warning was realized by hardware-in-loop mode. The construction of the virtual simulation platform for lane keeping and departure warning integrates experimental innovation capabilities with engineering capability training, and reflected the ability-based teaching thinking. The practical results show that the result-oriented new energy vehicle lane keeping assist virtual simulation practice innovation platform system can better highlight the student-oriented and ability-based teaching characteristics, and the students' innovation awareness and innovation ability are significantly improved. References | Related Articles | Metrics

Select

Discussion on the Teaching Mode of Motor and Electrical Control Technology LI Xiangqin 2022, 47(21): 167-170.  DOI: 10.16638/j.cnki.1671-7988.2022.021.031 Abstract ( )   PDF (1086KB) ( )   Motor and Electrical Control Technology is an important professional basic course for new energy vehicle technology major. The course has the characteristics of strong theory, abstract knowledge points and wide range of basic knowledge, so it is difficult to learn. Taking the new energy vehicle technology major of Jiangxi University of Technology as an example, based on the actual teaching situation, this paper analyzed the characteristics of the course, teachers and students from the perspectives of course content, learning situation and teachers, and pointed out the problems existing in the current teaching methods, assessment process, students' enthusiasm, classroom atmosphere, etc., and finally discussed the ideas and measures of curriculum teaching reform combined with the current situation. References | Related Articles | Metrics

Select

Construction on Case Teaching of Vehicle Crash Safety Technology Course for Professional Degree Master HAO Qi 2022, 47(21): 171-175.  DOI: 10.16638/j.cnki.1671-7988.2022.021.032 Abstract ( )   PDF (1274KB) ( )   The performances of vehicle crash safety technology course is the integration of multidisciplinary, the great difficulty of simulation algorithm theory and the complexity of engineering research system. In view of the relatively weak mechanics foundation and engineering consciousness of professional degree masters, the case teaching method of covering knowledge points with mult-case is proposed. The course case library is built aimed to the solid theoretical foundation, improving the engineering ability and training innovation consciousness. The case teaching is constructed and implemented centered on students to improve the gain of course. The research provided the reference for the continuous improvement of case teaching. References | Related Articles | Metrics

Select

Exploration and Reflection on Environment Awareness Training Room Construction of Intelligent Connected Vehicle in Secondary Vocational Schools DU Feng 2022, 47(21): 176-180.  DOI: 10.16638/j.cnki.1671-7988.2022.021.033 Abstract ( )   PDF (1446KB) ( )   With the rapid development of technology of the intelligent connected vehicle and the promotion of relevant policies in China, the secondary vocational schools have begun to explore the professional construction of the intelligent connected vehicle. As the cradle of cultivating skilled talents, the primary condition of professional construction in secondary vocational schools is to be equipped with corresponding training rooms. However, as an emerging field for the intelligent connected vehicle, some secondary vocational schools have not formed a perfect curriculum system and lack professional training rooms and training equipment. Based on the basic principles of training room construction, this paper put forward a set of design scheme of environment awareness training room of the intelligent connected vehicle, and analyzed the operation mode of the training room, so as to provide reference and experience for the later construction of training room of the intelligent connected vehicle in secondary vocational schools. References | Related Articles | Metrics

Select

The Teaching Reform of the Course Construction and Maintenance of Automobile Electrical Equipment under the 1+X Certificate System HAO Lin 2022, 47(21): 181-185.  DOI: 10.16638/j.cnki.1671-7988.2022.021.034 Abstract ( )   The construction and maintenance of automobile electrical equipment is a core course of automobile inspection and maintenance technology major in higher vocational college. The content of the course mainly involves the structure and principle of automobile electrical equipment, the identification and analysis of circuit diagram, fault diagnosis and elimination and so on. Though comparing and analyzing curriculum standards and the content of the automotive electronics electrical and air-conditioning comfort system (intermediate) module in the automotive application and maintenance vocational skill level certificate, adjusting the course teaching objectives, optimizing the teaching content, enhancing the quality of teachers, changing the teaching way, improving the way of evaluation, aims to explore the method and implementation of the effective integration of the certificate examination and course teaching activities, to provide reference for the development of curriculum teaching activities. References | Related Articles | Metrics

Select

Working Process and Fault Diagnosis Method of Magotan B8L Anti-theft System ZHANG Yanfei 2022, 47(21): 186-189.  DOI: 10.16638/j.cnki.1671-7988.2022.021.035 Abstract ( )   PDF (1146KB) ( )   With the development of science and technology, the new technology in the automobile is applied more and more widely, making the automobile have more complete functions and more complex structure, at the same time, the security and convenience of the anti-theft system to the vehicle has become higher requirements. The function and classification of Magton B8L automobile anti-theft system is analyzed, the body anti-theft system and the engine anti-theft system are introduced, and the control logic and working process of the engine anti-theft system is emphasised, as well as various phenomena in the process of signal transmission in this paper. Through a large number of tests on the real car is used to verify the theory, the cause of the problem is analyzed through the use of fault phenomenon, the automobile anti-theft system fault diagnosis methods and processes are summed up, and take a start button E378 and related line fault diagnosis for example, the process of fault diagnosis for anti-theft system is showed to provide a certain amount of train of thought of fault analysis, to provide some method reference of fault diagnosis of anti-theft system and the practical training and teaching of automobile fault diagnosis is also helped. References | Related Articles | Metrics

Standards Regulations Management

Select

Process Quality Control of Heavy Truck Industry to Three Inspection System Applied GUO Jiali 2022, 47(21): 190-195.  DOI: 10.16638/j.cnki.1671-7988.2022.021.036 Abstract ( )   PDF (2930KB) ( )   As one of the basic methods in quality management, three inspections are widely used in all walks of life. Three-inspection is a working method of self-inspection of employees, mutual inspection of adjacent stations, and special inspection of inspectors. The main content of this paper is how to refine the three-inspection system principles and implementation steps. In the process of quality control, the company innovatively proposes to refine the requirements of self-inspection, mutual inspection and special inspection in the three-inspection system into a seven-step selfinspection method, three-step mutual inspection method and five-step special inspection method. Use formulas to make it easier for employees to remember. At the same time, the marking standard of the three-inspection marking line is formulated, and the color, length and direction of the marking line are specified, so that the implementation results of different personnel are consistent, so as to effectively combine the three-inspection system with the actual production, and improve the level of process quality control. After the company has promoted and applied this method, the number of quality problems has been significantly reduced. References | Related Articles | Metrics

Select

Analysis on the EPB Development System of a New Energy Commercial Vehicle HE Guo 2022, 47(21): 196-201.  DOI: 10.16638/j.cnki.1671-7988.2022.021.037 Abstract ( )   PDF (2243KB) ( )   Electrical park brake (EPB) is a kind of vehicle brake-by-wire technology, which has obvious advantages over traditional parking brake systems in terms of structure and function. This technology has basically become the standard configuration of passenger vehicles, but it is rarely used in commercial vehicles with 4.5 t hydraulic brakes. Based on this situation, this article introduces the electrical park brake system development process of new energy hydraulic brake commercial vehicles, and discusses the electrical park brake development process in detail from five dimensions: functional safety, technical route, data verification, system layout and control strategy, so as to provide a standardized development process to bring some references to relevant practitioners, and be more beneficial to the development of the electrical park brake industry in commercial vehicles. References | Related Articles | Metrics

Overview

Select

Research and Progress on Automotive Reliability for Interior and Exterior Parts MIN Quanzhao 2022, 47(21): 202-206.  DOI: 10.16638/j.cnki.1671-7988.2022.021.038 Abstract ( )   PDF (1657KB) ( )   The reliability of automotive interior and exterior parts is particularly important in product development for the complexity of the use environment. The accelerated development of automotive reliability for interior and exterior parts, as well as its classification and performance requirements were introduced in this paper. The artificial weathering aging test and its principle, the classification and application scope of vibration bench were introduced in detail. At the same time, it was illustrated by example in the system durability test and safety test. The research status of reliability tests was further summarized. Finally, the development direction of automotive reliability for interior and exterior parts was summarized and prospected. References | Related Articles | Metrics

Select

The Effect of Driving Style on Driving Energy Consumption of Pure Electric Bus ZHAO Tianxin 2022, 47(21): 207-211.  DOI: 10.16638/j.cnki.1671-7988.2022.021.039 Abstract ( )   PDF (1115KB) ( )   To Classify drivers' driving styles to measure the impact of different driving styles on the energy consumption of pure electric vehicles. Using principal component analysis and K-means to divide driving style types, and using support vector machine (SVM) to build models for training. Then, based on the AVL Cruise simulation model, the bus running energy consumption data is output, and the energy consumption differences of drivers with different driving styles are compared. The results show that after the model labeled prediction of the test set, the classification accuracy rate was 93%, Under the same route, the aggressive driver has more energy recovery. Compared with the normal driver, the fuel consumption per mileage of the aggressive driver and the cautious driver increased by 2.81% and 4.44% respectively. Taking advantage of the degree of influence, measures such as screening and training of drivers are taken accordingly, thereby reducing the energy consumption of pure electric bus operation. References | Related Articles | Metrics