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主办:陕西省汽车工程学会
ISSN 1671-7988  CN 61-1394/TH
创刊:1976年

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    Intelligent Connected Vehicle
    Research on N2 Intelligent Network Connected Logistics Vehicle Fire Monitoring Management System
    LIU Biaojie
    2023, 48(18): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2023.018.001
    Abstract ( )   PDF (618KB) ( )  
    With the significant increase of freight flow in recent years, the fire hazard of logistics vehicles is becoming increasingly prominent. By investigating the fire accidents of logistics vehicles in recent years, this paper analyzes the drawbacks of current vehicle-mounted fire fighting equipment and conventional countermeasures. An intelligent vehicle mounted nitrogen generation, storage and supply device is proposed to precisely control the concentration of N2 in the closed compartment, cut off the necessary conditions for spontaneous combustion, and reduce the risk of spontaneous combustion damage of goods during medium and long-distance transportation.
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    A Design Method of Vehicle and Road Cooperative Closed Field Test System
    LI Yunbao
    2023, 48(18): 5-9.  DOI: 10.16638/j.cnki.1671-7988.2023.018.002
    Abstract ( )   PDF (874KB) ( )  
    The intelligent connected vehicle is equipped with advanced environmental awareness system and intelligent logic algorithm functions, and has environmental awareness and intelligent decision-making. However, the prediction and control of road blind spots is a barrier that can not be crossed by single car intelligence. At present, roadside sensing and vehicle networking technology has become one of the recognized technical routes for the development of driverless vehicles, road traffic safety and efficiency improvement in the future.Based on the standard sorting and visiting and investigating the domestic test sites and demonstration areas of the internet of vehicles,this paper puts forward the design method of road technical parameters and the design method of minimum communication distance based on the test scenarios, and proposes a design method of closed test site vehicle-road collaboration system in combination with the layout requirements of equipment and facilities, to meet the closed loop test and verification of the whole scene of the internet of vehicles vehicle-road collaboration.
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    Design and Research
    Research on Analysis and Improvement of Power and Economy of a Tractor
    YI Biao
    2023, 48(18): 10-14.  DOI: 10.16638/j.cnki.1671-7988.2023.018.003
    Abstract ( )   PDF (2202KB) ( )  
    In order to improve the power and economic performance of a tractor, the whole vehicle simulation model is established by using Cruise software, and the power and economic performance of the prototype vehicle is analyzed. By comparing the test data of competing products, it is found that the car has good power performance but poor economy. By comparing the coasting test data of the prototype vehicle and the competitive vehicle, the driving resistance of the whole vehicle is analyzed. Through computational fluid dynamics (CFD) analysis, the optimization scheme of the top of the cab is proposed to improve the driving resistance of the whole vehicle; The working range of the engine under different rear axle speed ratios is analyzed, and the improvement scheme for optimizing the rear axle speed ratio is put forward according to the customer's demand. The test results show that the optimization scheme is effective, improves the vehicle performance and enhances the product competitiveness.
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    Research on Regenerative Braking Control Strategy of a Plug-in Hybrid Electric Bus
    YANG Zhao
    2023, 48(18): 15-19.  DOI: 10.16638/j.cnki.1671-7988.2023.018.004
    Abstract ( )   PDF (1191KB) ( )  
    Plug-in hybrid electric vehicle can use both power grid and engine power. At present, it is an important vehicle to solve energy shortage and environmental pollution. Regenerative braking energy control strategy, as one of the key technologies of plug-in hybrid vehicle, determines the ability of vehicle to recover ability. This paper mainly describes the traditional pneumatic braking and regenerative braking system of a hybrid electric bus. The structure and working principle of regenerative braking are studied, and the calculation and analysis of regenerative braking are carried out for a hybrid electric bus. A braking power distribution scheme of rational distribution of mechanical and regenerative braking with proportional relay valves installed in front and rear wheels is put forward, which not only meets the ECE braking regulations of vehicle at empty and full load, but also achieves the maximum braking energy recovery control strategy.
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    Crashworthiness Analysis of Bus Body Skeleton Based on Lattice Filled Thin-walled Structures
    SHI Tianhua
    2023, 48(18): 20-28.  DOI: 10.16638/j.cnki.1671-7988.2023.018.005
    Abstract ( )   PDF (6135KB) ( )  
    Due to its excellent mechanical properties, lightweight and strong energy absorption properties, lattice materials have significant effects in improving automobile crash safety performance. In this paper, the mechanical properties of BCC lattice materials under compression and bending conditions are studied in depth by experimental and simulation methods, and their deformation mechanism and energy absorption characteristics are revealed. Subsequently, it is applied to the longitudinal beam and column of the bus, revealing the advantages of BCC dot matrix filled thin-walled structure in improving the collision safety performance of the whole vehicle.
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    Calculation and Analysis of Lifting Force for Double Top Sleeve Type Hydraulic Cylinder Dump Truck
    HU Xincai
    2023, 48(18): 29-33.  DOI: 10.16638/j.cnki.1671-7988.2023.018.006
    Abstract ( )   PDF (1386KB) ( )  
    In the small and medium-sized engineering dump truck plate, the double top sleeve type hydraulic cylinder is the most commonly used hydraulic lifting structure, which has the advantages of compact structure, high lifting efficiency, simple process, and strong lateral stiffness when two cylinders are used together, so it has been popularized. Through the analysis and calculation of the lifting force of the double top sleeve cylinder of the dump truck, the paper explains in detail the lifting force of the doubletop sleeve cylinder and the selection of gear pump, directional valve, hydraulic oil pipe and hydraulic oil tank components. At last, the model of the hydraulic cylinder is selected as 2TG-E90X450, the diameter of the first cylinder is 90 mm, the diameter of the second cylinder is 70 mm, and the route of thecylinder is 450 mm, which meets the lifting capacity requirements of the hydraulic system.
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    Analysis of Waterproof Principle of Glass Run of One Sport Utility Vehicle
    SONG Zhaoxuan
    2023, 48(18): 34-37.  DOI: 10.16638/j.cnki.1671-7988.2023.018.007
    Abstract ( )   PDF (1158KB) ( )  
    This article studies the waterproof principle of the general and corner parts of glass run. Aiming at the problem that the unreasonable setting of the positioning block shape of glass run will affect the waterproofing of foam found in practice, the principle and the shape setting of the positioning block are studied. The solution is given, which provides an effective solution for the subsequent glass run positioning block design.
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    Analysis and Optimization of the Impact Noise Problem of a Vehicle's Front Axle Passing through Speed Bumps
    GAO Long
    2023, 48(18): 38-42.  DOI: 10.16638/j.cnki.1671-7988.2023.018.008
    Abstract ( )   PDF (2070KB) ( )  
    In order to solve the problem of abnormal noise caused by the front axle passing through the deceleration belt of a certain vehicle model and improve the vehicle's impact comfort, a combination of subjective evaluation and objective measurement is used to identify the causes of the abnormal noise and provide empirical guidance for subsequent vehicle development. Firstly, through subjective evaluation of the actual vehicle, identify the potential causes of the abnormal noise. After subjective evaluation and objective measurement through physical modification, it is finally determined that the low engine mounting stiffness is the main reason for the impact noise of the front axle of the vehicle through the speed bumps. The impact noise issue of the speed bumps is resolved through physical optimization of the engine mounting, and improving the front axle impact comfort of the vehicle.
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    Performance Analysis of Knuckles Assembly of Formula Student Racing Car
    WANG Fengqi
    2023, 48(18): 43-46.  DOI: 10.16638/j.cnki.1671-7988.2023.018.009
    Abstract ( )   PDF (2548KB) ( )  
    The knuckle is the key connection between the suspension system, steering system and wheels in formula student cars, and its performance determines the handling stability, lightness and safety of the car. In order to better make the knuckles assembly meet the high-intensity use conditions of formula racing, first the force analysis and structural design of the column assembly are carried out, a three-dimensional model of the knuckle assembly is established, and then the knuckles assembly is analyzed by finite element when braking and high-speed extreme cornering. The analysis results show that the stress distribution and deformation displacement of the knuckles assembly meet the functional requirements of formula cars.
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    A Mode Switching Control Strategy of Hybrid Electric Vehicle
    PENG Yaorun
    2023, 48(18): 47-51.  DOI: 10.16638/j.cnki.1671-7988.2023.018.010
    Abstract ( )   PDF (939KB) ( )  
    When the charging capacity of the power battery of the hybrid electric vehicle is low, the charging capacity of the battery cannot take into account the mode switching speed regulation power generation and energy recovery power generation, and the mode switching during the coasting energy recovery process will cause the vehicle irregularity. To solve this problem, a mode switching control strategy for energy recovery process of hybrid electric vehicle is proposed. According to the real-time information of the vehicle, the mode switching type and the state of energy recovery are identified. The mode switching type is series switching parallel and the vehicle is in the state of energy recovery. By reducing the engine torque to the oil cut-off torque and the speed regulation time of mode switching is extended to reduce the power generation of the generator during the speed regulation process. The results of vehicle calibration test show that the mode switching control method in this study can ensure that the wheel end can recover according to the target recovery torque, and significantly improve the vehicle ride comfort of mode switching during the coasting energy recovery process.
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    Optimization and Verification of a Light Truck Longitudinal Beam Connecting Plate Structure Based on Finite Element Analysis
    HUANG Kang
    2023, 48(18): 52-55.  DOI: 10.16638/j.cnki.1671-7988.2023.018.011
    Abstract ( )   PDF (1792KB) ( )  
    Taking a light truck longitudinal beam connection plate as the research object, its "inflection point" stress value exceeds the material yield limit, and the cracking risk is high. Based on the finite element simulation analysis, two optimization schemes are adopted to spheroidize the inflection point area, which reduces the maximum stress to below the material yield limit. According to the test and verify empirical analysis the two optimization schemes reduce the maximum stress by 45.3% and 54.8% respectively, and the effect of scheme two is better.
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    Design of Safety Protection Structure of Pure Electric Bus in Rear End Impact
    CUI Chongzhen
    2023, 48(18): 56-61.  DOI: 10.16638/j.cnki.1671-7988.2023.018.012
    Abstract ( )   PDF (4131KB) ( )  
    Power battery packs, vehicle control unit and power distribution unit of pure electric bus are always located at its rear end. Short circuit, leakage of electricity and fire would occur when the rear end of pure electric bus is impacted by truck or bus. In order to improve and evaluate the protection effect of pure electric bus rear end structure, the simulation method of rear impact by truck with 100% and 30% overlap is used to analyze the rear end structure deformation of electric bus. The energy absorption structures and impact force transfer structures are designed to improve electric bus safety in rear end impact. The simulation results show that the deformation of bus rear ear structures and the damage risk of battery packs, power distribution unit of pure electric bus are decreased obviously.
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    Analysis and Research on Abnormal Noise Fault of a Heavy Duty Transmission
    CHEN Junyan
    2023, 48(18): 62-66.  DOI: 10.16638/j.cnki.1671-7988.2023.018.013
    Abstract ( )   PDF (2316KB) ( )  
    Heavy duty transmissions play an important role in the transmission system of commercial vehicles, as their quality directly affected driving comfort and handling. In order to adapt to the development trend and matching needs of high-power engines in commercial vehicles, this article analyzes the structure and characteristics of a heavy-duty transmission gear transmission, and finally summarized the common faults and cause analysis of the gearbox, The spindle floating and lubrication measures in the transmission design are proposed. This can provide a basis and reference for the diagnosis of abnormal noise faults in the gearbox and the design of the gearbox.
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    Optimization of Acoustic Performance of Timing Cover Plate of a High Efficiency Gasoline Engine
    ZHANG Jiaxu
    2023, 48(18): 67-71.  DOI: 10.16638/j.cnki.1671-7988.2023.018.014
    Abstract ( )   PDF (2467KB) ( )  
    Timing cover plate is an important structural component of high efficiency hybrid gasoline engine, and its acoustic performance directly determines the radiated noise of the whole engine. In the noise, vibration, harshness (NVH) test of a newly developed hybrid special high efficiency gasoline engine, it is found that the radiated noise in front of the engine is at the maximum value in the four sides of the engine (front, intake side, exhaust side, above). A large number of local modes exist in the engine timing cover plate, and resonant radiation noise is generated under engine combustion excitation. The modal density and vibration amplitude of the timing cover plate can be effectively reduced by reducing the maximum pressure rise rate during engine combustion and adding bolt constraints at the dense location of the timing cover plate modes. The acceptance test results show that the radiation noise of the whole machine is reduced by 1~2.5 dB (A), which plays a key role in reducing the noise of the whole machine.
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    Analysis of Subjective and Objective Correlation Technology of Vehicle Handling Performance Based on Driving Simulator
    WU Liguang1,2
    2023, 48(18): 72-77.  DOI: 10.16638/j.cnki.1671-7988.2023.018.015
    Abstract ( )   PDF (3417KB) ( )  
    The handling performance is an important component of vehicle dynamic performance. At different stages of the vehicle development process, subjective or objective evaluation methods are usually used to verify and evaluate the handling performance. This paper conducts research on the subjective and objective correlation technology of vehicle handling performance based on driving simulators. Firstly, based on the driving simulator, a large amount of vehicle performance data for subjective and objective correlation research is generated using the calibrated vehicle model with experimental data; Based on these data, a subjective and objective correlation model is established using ridge regression method, and the accuracy of the model is verified. The research results of this paper can optimize the vehicle performance development process, improve vehicle development efficiency, and provide support for the development and evaluation of vehicle handling performance.
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    Testing and Experiment
    Effect Analysis of Intercooled Inlet Temperature on NOX Emission Performance of Heavy Duty Diesel Engine
    CATARC Automotive Inspection Center (Wuhan) Company Limited
    2023, 48(18): 78-81.  DOI: 10.16638/j.cnki.1671-7988.2023.018.016
    Abstract ( )   PDF (1000KB) ( )  
    The temperature of intercooled inlet is an important factor affecting the conversion efficiency of selective catalytic reduction (SCR). Taking a heavy duty diesel engine from a certain manufacturer as the research object, world harmonized transient cycle (WHTC) working condition is run on the engine bench test system, and the NOX emission of the engine in exhaust and that of the SCR catalytic converter are detected by constant volume sampling system (CVS) full-current dilution sampling system in this paper. The results show that when the intercooled inlet temperature is in 42~62 ℃, the exhaust temperature of supercharged and intercooled diesel engine can be effectively improved by increasing the inlet temperature of intercooled diesel engine, but it also increases the NOX emission in the original exhaust, and the increase of exhaust temperature improves the conversion efficiency of SCR. However, due to the increase of NOX emission in the original exhaust,the conversion efficiency of SCR first increases and then decreases.
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    Research on the Damage Degree of the Passenger's Body Caused by the Door in the Process of Lateral Collision
    YU Yan
    2023, 48(18): 82-88.  DOI: 10.16638/j.cnki.1671-7988.2023.018.017
    Abstract ( )   PDF (10654KB) ( )  
    Since the layout of urban traffic roads in China is dominated by plane intersections, the probability of vehicle side collision accidents increases year by year with the increase of vehicle ownership, and the damage to passengers is more serious than that of frontal collision. In order to analyze the injuries of various parts of the passenger's body in the process of vehicle side impact, the damage grade analysis and damage mechanics model of the shoulder, chest, abdomen and hip caused by the direct collision between the passenger and the door interior panel are carried out, and a simulation test bench for the side impact of the car door is built. The maximum acceleration and the maximum force of the impact block at different positions are obtained with the changing process of the deformation amount and time of the door. The results show that the maximum equivalent acceleration of shoulder, chest, abdomen and hip is 10.53g, 23.02g, 12.28g and 26.75g, the maximum force is 2 035 N, 3 718.87 N, 2 631.94 N and 5 419.25 N. The damage degree of shoulder is less than AIS4, the injury degree of other parts is less than AIS3.These experimental data provide the basis for the safe travel of front and outside occupants and the reliable design of the door structure.
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    Calculation Method of Camber Tolerance of Automotive Five-link Rear Suspension
    JIA Weizhen
    2023, 48(18): 89-94.  DOI: 10.16638/j.cnki.1671-7988.2023.018.018
    Abstract ( )   PDF (2442KB) ( )  
    In order to solve the problem of accurate calculation of four-wheel alignment tolerance for automotive five-link rear suspension. Based on the transverse dimension analysis, the dimensions of rear subframe, rear suspension five control arms, steering knucks, wheel hub, rear floor of lower body, and pallet are input into Volvo's special three-dimensional tolerance analysis software robust design & tolerancing (RD&T) for calculation. At the same time, Monte Carlo principle is used to intuitively show the influence factor and contribution degree of rear suspension size on external inclination angle. From the vertical dimension analysis, the camber tolerance is calculated by the spring height tolerance and the axle load tolerance. The theoretical camber tolerance calculated by this method is accurate and practical.
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    Simulation Analysis of Thermal Management System for an Extended Range Vehicle
    ZHOU Tao, FU Hao*
    2023, 48(18): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2023.018.019
    Abstract ( )   PDF (1304KB) ( )  
    In order to ensure the normal operation of the vehicle system, improve the energy efficiency of the vehicle, it is necessary to predict the temperature, flow and other characteristics of the vehicle thermal management system under different working conditions in the development stage. In this paper, a one-dimensional model of complex heat transfer system with multiple circuits and control is built, it is used to simulate the thermal management system of an extended range vehicle, calculate the equilibrium temperature and time when each component reaches the thermal steady state under the ultimate working condition, determine the influence of different air conditioning conditions on the heating time of the battery. After the calculation to determine, the machine can meet the system cooling requirements in high temperature limit condition, however, there is a risk that the water temperature exceeds the standard after the warm air is opened, and different air conditioning conditions have little influence on the heating time of the battery.
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    Comparative Study on Pollutant Emissions from Heavy Vehicles Based on PEMS and CVS
    ZHANG Chao
    2023, 48(18): 100-105.  DOI: 10.16638/j.cnki.1671-7988.2023.018.020
    Abstract ( )   PDF (2839KB) ( )  
    In order to ensure the accuracy of emission test results on the actual road of heavy-duty diesel vehicles, this article is based on the chassis testing method. A portable in vehicle emission testing system (PEMS) and a full flow dilution constant volume sampling (CVS) system are connected in series for synchronous emission testing, and the differences between in vehicle testing equipment and CVS test results are compared and analyzed. Research has shown that due to the CVS system being a full flow dilution sampling test, the mixing of dilution air and sampling gas will have a mixed average effect on the emission fluctuations of China world transient vehicle cycle (C-WTVC) transient conditions, thereby affecting the correlation between CVS emission test data and PEMS test data to a certain extent. By designing a constant speed stable operating condition test, the dilution effect of CVS can be eliminated to a certain extent, verifying the good correlation between the PEMS test results and the CVS system test results.
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    Analysis on Impact Noise of a Certain Vehicle Transmission System
    WANG Weigang
    2023, 48(18): 106-110.  DOI: 10.16638/j.cnki.1671-7988.2023.018.021
    Abstract ( )   PDF (1802KB) ( )  
    With the popularization of vehicle electrification, the market demands more and more noise, vibration, harshness (NVH) performance. In addition, because the motor torque response is faster than the start and start, the impact noise of the transmission system will be more obvious, which greatly affects the comfort of the vehicle. This paper focuses on the impact noise of the transmission system of a certain model, conducts a systematic analysis and research on the impact noise of the transmission system of a certain vehicle model. The NVH test method based on the bench has carried out detailed comparative test verification on four factors, including oil temperature, gear oil viscosity, torque climbing slope and torque peak value. Through time-domain analysis of the test signal, key influencing factors and components are identified, providing relevant solutions for the solution of impact noise.
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    Analysis and Optimization on Hiss Noise Test of a Turbocharger
    SHAN Fukui
    2023, 48(18): 111-116.  DOI: 10.16638/j.cnki.1671-7988.2023.018.022
    Abstract ( )   PDF (5026KB) ( )  
    With the increasing popularity of supercharged engines, the noise problem of superchargers has become increasingly prominent, especially Hiss noise, which has become a key and difficult problem in the industry. In order to solve the problem of Hiss noise of a certain type of engine turbocharger, this paper analyzes the generation mechanism of Hiss noise, identifies components with strong radiated noise through noise transmission path and frequency spectrum analysis, and acoustically wraps the turbine air intake pipe by making manual samples, it has been verified that the scheme is feasible. Finally, by changing the material of the intake pipe, making a quick sample, and verifying that the optimization scheme is feasible again, the Hiss noise can be solved. The research of this paper has important reference significance for solving the practical problems of noise, vibration, harshness (NVH) engineering.
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    Study on Technology of Improving the Strength and Toughness of Trailer Coupler
    ZHANG Yanjing
    2023, 48(18): 117-121.  DOI: 10.16638/j.cnki.1671-7988.2023.018.023
    Abstract ( )   PDF (1950KB) ( )  
    In order to improve the strength and toughness of the trailer coupler and its connecting parts, the structure of the trailer coupler and the material of the trailer coupler are optimized. Using the finite element software HyperWorks to simulate and verify the trailer coupler under different working conditions, and to analyze the residual deformation of the trailer coupler after unloading. The analysis shows that the residual deformation of the optimized trailer coupler is lower than that of the original one, and the yield strength of the structure of the trailer coupler is improved. The impact toughness of 40CrMo steel for trailer coupler can be increased by heat treatment. The effect of tempering time after quenching on the microstructure and properties of 40CrMo steel is studied, the process of heat treatment is 790 ℃quenching +560 ℃ tempering. The impact toughness of the material increases with the prolongation of tempering holding time.
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    Process·Materials
    The Design of the Flipping Platform for Heavy Commercial Vehicles Front Axle
    WEN Chengqin
    2023, 48(18): 122-129.  DOI: 10.16638/j.cnki.1671-7988.2023.018.024
    Abstract ( )   PDF (3090KB) ( )  
    By analyzing the process of heavy commercial vehicle chassis assembly line and combining with the structural characteristics of the front axle assembly of heavy commercial vehicles, a work platform has been developed to achieve automatic flipping of the front axle assembly of heavy commercial vehicles. This automatic flipping platform can eliminate safety hazards during manual flipping, improve labor productivity, and integrate the positioning, assembly, and flipping of the current front axle assembly into one platform, shortening the process time from 6 minutes to 5 minutes, improve the automation level of the assembly line and achieve increased production capacity.
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    Lightweight Design and Verification of Automobile Carbon Fiber Composite Control Arm
    XIE Ying
    2023, 48(18): 130-135.  DOI: 10.16638/j.cnki.1671-7988.2023.018.025
    Abstract ( )   PDF (1632KB) ( )  
    In order to effectively utilize the excellent mechanical properties of carbon fiber composites, the lightweight design of an automobile control arm is carried out by using carbon fiber composite material. Firstly, the finite element model of the original steel control arm is established, and its accuracy is verified through modal experiments, and the stiffness and strength analysis of the steel control arm are carried out. Then, based on the geometric characteristics of the steel control arm, the geometric reconstruction is carried out for the carbon fiber composite control arm, and considering the mass, vibration characteristics, stiffness, strength and process constraints, the optimization design of them are carried out by free size optimization, size optimization and laying sequence optimization, and the optimal carbon fiber composite with layer shape, thickness and layering sequence is obtained. Finally, by comparing with the performance of the original steel control arm, it is concluded that the longitudinal stiffness and lateral stiffness of the control arm increase by 13.6% and 1.4% respectively. Meanwhile, the strength and vibration characteristics are greatly improved, and the weight is reduced by 63.7%, achieving a significant lightweight effect.
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    Research on the Factors Affecting the Accuracy of Cylindricity Measurement
    KE Changquan
    2023, 48(18): 136-139.  DOI: 10.16638/j.cnki.1671-7988.2023.018.026
    Abstract ( )   PDF (2666KB) ( )  
    In the process of machining, in order to further improve the accuracy of cylindricity measurement and standardize the measurement, the factors affecting the accuracy of cylindricity measurement are studied, and the influence of the selection of Gaussian filter range on the measurement results is obtained. Suitable Gaussian filter range is selected for different cylindrical diameters. The tangent and complement method is used to eliminate the boundary effect in the process of Gaussian filtering. At the same time, the selected section number and axial effective measurement length are explored, and a reasonable selection number and axial effective measurement length are obtained. By optimizing the above factors affecting the cylindricity measurement accuracy, a set of standardized and reasonable inspection methods are provided to improve the cylindricity measurement accuracy in the production process and ensure the reliability of test results, which is of great significance to the quality control of products.
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    The Visual Inspection System for Quantity of Passat Roof Rivet
    SHAO Qidong
    2023, 48(18): 140-143.  DOI: 10.16638/j.cnki.1671-7988.2023.018.027
    Abstract ( )   PDF (3358KB) ( )  
    In the current riveting production process of Passat roof, manual visual inspection is used to check whether there is rivet omission, which is inefficient, and there are problems such as wrong inspection and missing inspection. In this paper, the deep learning convolution neural network is introduced into the roof riveting detection, and a convolution neural network algorithm based on ReLU activation function is proposed. Experiments show that the algorithm has high accuracy and strong robustness, which provides a new idea for the application of deep learning to vehicle body visual detection, The success rate of experimental detection reaches 99.87%, meet the quality assurance requirements in the production process, which has guiding significance for the engineering application and promotion.
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    Design and Application of Wet Automatic Deburring Unit
    XIONG Zhao
    2023, 48(18): 144-148.  DOI: 10.16638/j.cnki.1671-7988.2023.018.028
    Abstract ( )   PDF (2595KB) ( )  
    With the increasing demand for product quality and cleanliness in China's manufacturing industry, deburring has become one of the important processes in the manufacturing process. Retarder shell parts due to the complex structure, the parts of the retarder housing have many burrs, and most production lines mainly use a combination of manual and machine tool deburring methods. Manual deburring has low efficiency, high labor intensity, and a harsh working environment, making it easy to scratch or miss the workpiece. Due to limited freedom, the deburring area of the machine tool is limited, and it will also occupy the processing rhythm. Robot deburring has advantages such as high flexibility, high accuracy, high efficiency, low environmental requirements, complex processing space, long working time, and low scrap rate, and has become a new trend in the field of deburring. This article will take a wet automatic deburring unit for a retarder shell as an example, and briefly introduce the design concept and application of the robot automatic deburring unit from the aspects of scene requirements, robot selection, process design, polishing system design, fixture and grip system design, spray system design, programmable logic controller control system design, etc., providing necessary reference for the design of similar complex shell automatic deburring equipment.
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    Automobile Education
    Construction of Integrated Curriculum System for Secondary and Higher Vocational Education of New Energy Vehicle Technology Specialty
    HUANG Chaoqun
    2023, 48(18): 149-152.  DOI: 10.16638/j.cnki.1671-7988.2023.018.029
    Abstract ( )   PDF (986KB) ( )  
    In order to solve the problems of discontinuous training objectives, inconsistent curriculum system, and loose connection between the curriculum system and professional standards in the connection training of talents in middle and higher vocational education, the integrated curriculum system of new energy vehicle technology specialty is constructed according to the law of gradual improvement of skills and abilities. Through school-school cooperation, school-enterprise cooperation in the development of resources, the establishment of a mixed teaching team in secondary and higher vocational schools, and the construction of a "four-dimensional, multi-agent" curriculum evaluation system, have effectively guaranteed the comprehensive training of talents.
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    Research on the Path of Promoting "Classroom Revolution" Effectively in Higher Vocational Colleges -Take the Course of Automobile Electrical System Overhaul as an Example
    SHAO Haiquan
    2023, 48(18): 153-157.  DOI: 10.16638/j.cnki.1671-7988.2023.018.030
    Abstract ( )   PDF (989KB) ( )  
    At present, there is a problem of the traditional teaching status quo in higher vocational colleges, which leads to students' low enthusiasm and weak grasp of knowledge in class. In view of this problem, combined with the training goal of higher vocational talents, and taking classroom revolution as the starting point, this paper puts forward five ways to implement classroom revolution, that is, to introduce and implement the system and supporting policies to effectively promote "classroom revolution" at the school system level; At the level of course content, we should strengthen the supply of ideological and political content, integrate course resources, strengthen the application of "three new" technologies, timely update course content, adapt to the needs of industry and enterprise technological development, and improve students' adaptability to employment; Teachers should strengthen their practical teaching ability and improve their teaching ability; At the level of teaching materials, we should develop new forms of teaching materials; Teaching methods should be updated in time. Taking the course of Automobile Electrical System Overhaul as an example, through five ways of "system, teaching content, teachers, teaching materials, teaching methods", it is deeply implemented and effectively promoted in the "classroom revolution". The results show that this method can improve the quality of talent training and achieve good results.
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    Development of Loose-leaf Teaching Materials under the Integrated Concept of "Post Class Competition Certificate" -Taking the Textbook Development of Pure Electric Vehicle Fault Diagnosis and Elimination as an Example
    CHEN Xiaopeng
    2023, 48(18): 158-162.  DOI: 10.16638/j.cnki.1671-7988.2023.018.031
    Abstract ( )   PDF (1354KB) ( )  
    Pure Electric Vehicle Fault Diagnosis and Elimination is a required theoretical and practical integration course for new energy vehicle major. Combined with the new energy vehicle mechanical and electrical maintenance post tasks, docking intelligent new energy vehicle vocational skill level certificate standards and skill competition standards. Based on the integrated concept of "post class competition certificate" to develop the loose-leaf textbook Pure Electric Vehicle Fault Diagnosis and Elimination, integrating ideological and political elements, new technology, new norms, virtual simulation and other contents to cultivate high-quality technical and technical talents with good professional quality and professional technical skill level.
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    Course Reform and Practice of Automobile Insurance and Claims under the Background of Teaching Ability Competition
    MAO Yinghui
    2023, 48(18): 163-167.  DOI: 10.16638/j.cnki.1671-7988.2023.018.032
    Abstract ( )   PDF (1201KB) ( )  
    Based on the experience in the teaching ability competition of vocational college skills competition, taking the core course of insurance practice major Automobile Insurance and Claims as an example, this paper expounds the teaching design and implementation of the course from four aspects: overall teaching design, teaching implementation process, student learning effect, reflection and improvement. By adopting the "six three four" learning closed loop and developing the teaching strategy of "strong process and three integration", the paper explores the teaching reform practice of insurance practice in vocational colleges and provides ideas for teaching reform.
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    Standards·Regulations·Management
    The Location of Electric Vehicle Charging and Switching Facilities Based on GPS Data
    YAN Na
    2023, 48(18): 168-173.  DOI: 10.16638/j.cnki.1671-7988.2023.018.033
    Abstract ( )   PDF (1328KB) ( )  
    China has entered a stage of rapid development of electric vehicles, and the construction of charging and switching facilities plays a crucial role in the popularization of electric vehicles. In this paper, charging is categorized into slow charging station, fast charging station, and power exchange station according to the charging duration, and the siting problem of these three types of charging stations in urban areas is studied. Based on the global positioning system (GPS) trajectory data of social vehicles in a district of Xi'an, an arithmetic example is analyzed, and then combined with the NSGA-II algorithm to solve the problem. Six typical solutions are selected for scenario analysis, and the results show that: the construction cost, user convenience and average utilization rate cannot be optimized at the same time; if the decision maker prefers one of the indexes, the other two indexes decrease; if the decision maker takes the compromise solution, all three indexes decrease relative to the optimal value. Finally, based on the results of the analysis, relevant suggestions are provided for the construction of charging and switching facilities.
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    Application of Digital Management of Test Quality Problems in Automobile Research and Development Stage
    LI Tao
    2023, 48(18): 174-178.  DOI: 10.16638/j.cnki.1671-7988.2023.018.034
    Abstract ( )   PDF (1442KB) ( )  
    In the process of automobile research and development (R&D), there will be defects in all aspects, such as unreasonable design scheme, insufficient structural design strength, and substandard vehicle performance. It is very important to find design defects in the R&D stage and carry out reasonable closed-loop management. Based on the quality management system of Automotive Engineering Institute, Guangzhou Automobile Group Company Limited, the R&D projects of Trumpchi EMPOW and other vehicle models, this paper briefly summarizes the whole life cycle management process of design defects in the R&D process from putting forward to closing. It focuses on the rapid and accurate filling of R&D test quality problems and their statistical methods based on digital technology. At the same time, it also introduces the analysis and digital implementation methods of vehicle R&D test quality problems. The description of common design defects templated by digital technology, the test quality problem record form automatically filled according to the test task information, and the problem grade intelligently recommended by machine learning algorithm, which can greatly improve the filling efficiency and accuracy of test quality problems. Based on the comprehensive application of modern digital technologies such as the internet of vehicle, 5G and digital modeling of analytical methods, the efficiency of quality problem analysis can be greatly improved.
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    The Influence of Internal Control on the Operation and Development of Automobile 4S Shop -Take Shanxi Dachang FAW-volkswagen 4S Shop as an Example
    SHI Qiao
    2023, 48(18): 179-182.  DOI: 10.16638/j.cnki.1671-7988.2023.018.035
    Abstract ( )   PDF (956KB) ( )  
    Along with the rapid development of modern market economy, norms and regulations concerning internal control in our country are gradually optimized. In order to seek the good develop- ment of automobile 4S shop in the future, it is necessary to strengthen the internal management according to the economic development trend of modern society, and effectively promote the operation and management. This paper takes Shanxi Dachang FAW- Volkswagen 4S shop as an example. Through the research and analysis of its internal control environment, risk assessment mechanism, management system and monitoring system, it finds that it pays little attention to risk assessment, its internal monitoring system is not perfect, and its management system is more traditional. This paper puts forward suggestions for this problems: optimize the internal control environment, enhance the enterprise's ability to resist risks, adopt the international management system and integrate the monitoring system with the business structure.
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    Reviews
    Research on Particle Number Control Method of Diesel Engine
    FENG Hui
    2023, 48(18): 183-187.  DOI: 10.16638/j.cnki.1671-7988.2023.018.036
    Abstract ( )   PDF (1773KB) ( )  
    With the intensification of global air pollution, the control of diesel emission pollutants is one of the most important measures to solve the pollution. Particle number (PN) in diesel emissions not only pollutes the air, but also seriously endangers people's health. In order to meet the requirements of PN in the regulations, optimization measures are put forward from four aspects, namely, optimization of combustion, piston ring group, separation mode of oil/gas separator, and diesel particulate filter (DPF), and the feasibility of the optimization measures is verified through tests.
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    Research and Prospect on the Cycle Life Test Profiles of Traction Batteries for Vehicles
    HAO Weijian
    2023, 48(18): 188-193.  DOI: 10.16638/j.cnki.1671-7988.2023.018.037
    Abstract ( )   PDF (1107KB) ( )  
    Cycle life is the core technical parameter of traction batteries, and cycle testing profiles are the core content of traction battery cycle life test. In order to further improve the cycle testing profiles of traction batteries, this work firstly analyzes domestic and overseas standards such as China light-duty vehicle test cycle for passenger car (CLTC-P) and new European driving cycle (NEDC), as well as academic vehicle driving profiles. Two methods for converting vehicle driving profiles from theoretical calculation or actual vehicle testing to traction battery conditions are introduced. The domestic and overseas cycle profiles of traction batteries are also shown. Finally, the direction of improving the cycling profiles of traction batteries is pointed out. This paper will provide reference for improving the cycling profiles of traction batteries in the future.
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    Driving Style Recognition Based on Vehicle Driving Data
    LU Yibin
    2023, 48(18): 194-197.  DOI: 10.16638/j.cnki.1671-7988.2023.018.038
    Abstract ( )   PDF (1233KB) ( )  
    Driver's driving style is an important impact on fuel economy and driving safety. This paper summarizes the research on driving style recognition based on vehicle driving data. Firstly, it introduces the basic process of driver's driving style recognition, and then discusses the algorithm models used by different scholars in driving style recognition, including support vector machine (SVM) algorithm, back propagation (BP) neural network algorithm and random forest model algorithm. Then, based on the actual vehicle driving data, different driving style recognition models are used to realize the analysis, and finally the research work of driver driving style recognition is prospected.
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    Progress of "High-old High-hot and High-altitude" Environmental Simulation Test of Hydrogen Fuel Cell Engine
    LI Long
    2023, 48(18): 198-203.  DOI: 10.16638/j.cnki.1671-7988.2023.018.039
    Abstract ( )   PDF (1133KB) ( )  
    Hydrogen fuel cell engine has the advantages of cleanliness, environmental protection and high efficiency, and is increasingly favored by the society. At the same time, higher requirements in environmental adaptability of hydrogen fuel cell engine are also put forward. The test of "High-cold high-hot and high-altitude" is an important means to verify the adaptability of hydrogen fuel cell engine to extreme environment. This paper mainly introduces the "High-cold high-hot and highaltitude environmental simulation test, test equipment and platform construction, test items and influencing factors of hydrogen fuel cell engine from the perspective of laboratory, looking forward to providing reference value for the application of hydrogen fuel cell engine in practical application scenarios through laboratory environment simulation.
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