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30 October 2023, Volume 48 Issue 20 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management
Reviews


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New Energy Vehicle

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State of Health Estimation of Lithium-ion Batteries for Vehicles HU Huimin 2023, 48(20): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2023.020.001 Abstract ( )   PDF (494KB) ( )   Lithium-ion batteries are the main source of power for new energy vehicles, and their status of health estimation is closely related to battery maintenance, repair, and replacement. In this paper, battery capacity is selected as a direct health factor, three indirect health factors are extracted based on battery charging voltage curve, and the correlation between them and capacity is calculated using Pearson and Spearman correlation coefficients. The results show that the correlation between charge time equal voltage and capacity is the highest. Gaussian process regression (GPR) algorithm is selected to establish the state of health (SOH) estimation model, and conjugate gradient method (CGM) is selected to calculate the hyper parameter of the model, which can better estimate the SOH of lithium-ion batteries. References | Related Articles | Metrics

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Analysis and Optimization of Motor Whine in an Electric Pickup Truck LUO Yichao 2023, 48(20): 5-9.  DOI: 10.16638/j.cnki.1671-7988.2023.020.002 Abstract ( )   PDF (2855KB) ( )   When accelerating to 60~100 km/h, a high-frequency whine problem occur in an electric pickup truck. For motor excitation source, the structure and manufacturing process are deeply analyzed in this paper, and the influence of magnetic block flux tolerance, rotor thickness and rotor manufacturing technology on motor whine is studied. For the vehicle transmission path, the influence on motor whine of drive shaft mode and motor end cover mode is analyzed by finite element method and experimental modal method. Finally, by improving frequence of motor end cover mode, adding sound-absorbing paper to drive shaft tube and improving the manufacturing process of rotor, the 48th order motor noise in vehicle is optimized by 6~10 dB(A), which effectively solves the motor whine problem of the electric pickup truck. References | Related Articles | Metrics

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Optimization Design of New Energy Vehicle Electric Drive Rear Axle Permanent Magnet Synchronous Motor ZHAO Xichang 2023, 48(20): 10-14.  DOI: 10.16638/j.cnki.1671-7988.2023.020.003 Abstract ( )   PDF (784KB) ( )   The drive motor is one of the key components of the powertrain of new energy vehicles, and its performance index directly affects the quality of vehicle power output. With reference to the performance indicators of a new energy vehicle, permanent magnet synchronous motor is selected as the electric rear axle drive motor. The power, speed, torque and other key parameters of the motor are obtained through calculation. Based on the performance parameters of the motor, the motor structure parameters are selected. Based on MotorCad software, parametric method is used to reduce the peak of tooth groove torque as the optimization objective, the thickness, width and air gap length of the motor permanent magnet are optimized, and the efficiency MAP and external characteristic diagram of the motor are obtained. The results show that the cogging torque is significantly reduced compared with that before optimization. By selecting the driving China light-duty vehicle test cycle-passenger (CLTC-P) for simulation analysis, the rationality of the optimization design of permanent magnet synchronous motor is verified. References | Related Articles | Metrics

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Simulation Analysis of Fuel Cell Thermal Management System GENG Haowei 2023, 48(20): 15-19.  DOI: 10.16638/j.cnki.1671-7988.2023.020.004 Abstract ( )   PDF (976KB) ( )   In this paper, 120 kW hydrogen fuel cell system is taken as the research object, combined with thermal management requirements, the control strategy is simulated and analyzed. The simulation model of the hydrogen fuel cell thermal management system is built by AMESim software. The heat production of the reactor and the intercooler is taken as the input condition, and the inlet temperature of the reactor and the inlet and outlet temperature difference are taken as the evaluation index. Firstly, the simulation calculation of the rated working conditions is carried out, and it is obtained that under the rated working conditions, the inlet temperature of the reactor is 72.8 ℃, the outlet temperature is 79.1 ℃, and the temperature difference is 6.3 ℃. The water pump and heat sink meet the heat dissipation requirements. Then the full power simulation analysis shows that the water pump, fan and thermostat can well respond to the temperature change, and with the increase of heat generation, the inlet temperature of the reactor can be maintained within 75 ℃, and the temperature difference can be maintained within 8 ℃ , which meets the temperature control requirements of the reactor. References | Related Articles | Metrics

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Power System Integration and Matching Analysis of Extended Range Electric Bus FANG Yongqiang 2023, 48(20): 20-25.  DOI: 10.16638/j.cnki.1671-7988.2023.020.005 Abstract ( )   PDF (1022KB) ( )   Extended range electric bus have the characteristics of pure electric driving and longdistance extended range driving, which can alleviate the concern of pure electric bus mileage. According to the market demand and practical application scenarios, the performance matching design of the drive motor, power battery, range extender-assembly and other core components of the extender-range electric bus power system is carried out in this paper, and the dynamics model of the vehicle power system is established in the software platform of MATLAB-Simulink. Based on the use characteristics of pure electricity as the main and extended range as the auxiliary, the overall working strategy of the extended range power system is formulated, and then the cruise maintenance power at common speed and at high speed is calculated, and the output power of the range extender and the energy change of the power battery are simulated and analyzed under the China heavy-duty commercial vehicle test cycle-city coaches (CHTC-C) integrated working condition. The results show that the smaller the output power of the range extender, the more drive energy needed to be compensated by the power battery. When reaching a certain economic power, the power of the power battery is basically balanced. Compared with the traditional way of matching range extender power under a single working condition, this paper analyzes range extender power under multiple working conditions considering the specific needs of specific scenarios, providing ideas for the selection of range extender and the improvement of subsequent power follow strategy. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Design of Vehicle Right Turn Auxiliary System Based on Distance Sensor HU Qinghui 2023, 48(20): 26-29.  DOI: 10.16638/j.cnki.1671-7988.2023.020.006 Abstract ( )   PDF (754KB) ( )   In order to solve the problem of insufficient vision of the right non-motorized lane in the process of right turning, this paper proposes to install the ranging sensor in the front of the car to solve the problem. When the right turn signal is turned on, or the steering wheel turns right beyond the limit angle, the sensor starts to work, measure the position of the right pedestrian relative to the vehicle, forward speed, forward direction, and compare with the vehicle running track, calculate the possible collision time and collision point, and reflect on the center control screen to remind the driver to perform relevant operations. After research, it is found that when the vehicle turns to the right of 20°/40°, it is easy to misjudge the non-motorized lane. The system reminds the driver by image and sound to avoid traffic accidents. References | Related Articles | Metrics

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The Wiper Strategy Based on Infrared Reflection Rain Sensor GUAN Zhongxu 2023, 48(20): 30-34.  DOI: 10.16638/j.cnki.1671-7988.2023.020.007 Abstract ( )   PDF (1439KB) ( )   With the development of the automobile industry, people are becoming more and more intelligent requirements for vehicles, rain sensor has become an essential part of the automobile, at the same time in the rainy driving process, rain sensor can automatically control the wiper system and make the driver's attention more concentrated, without distraction to control the wiper system which improve the safety of driving. Therefore, this paper is mainly to study the strategy of the rainfall sensor in the process of automobile driving, from the working principle of the product, software algorithm logic, application conditions and other aspects of research and explanation, through the wiper strategy to achieve intelligent automatic wiper control, bring convenience to the driver, improve the use of vehicle comfort. Based on this software strategy, finally through the driving experience of test engineers and drivers, different rainfall conditions can be distinguished in a better area, which effectively improves the effect of automatic scraping, improves the stability of wiper control, and solves the problem of slow stop and scraping in tunnel mode. References | Related Articles | Metrics

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Research on the Development of Internet of Vehicles Technology Based on Patent Analysis XIN Minghua 2023, 48(20): 35-38.  DOI: 10.16638/j.cnki.1671-7988.2023.020.008 Abstract ( )   PDF (884KB) ( )   Analyzing and utilizing the technical information recorded in patents can effectively assist in determining research and development directions, improving research and development efficiency, and reducing the risk of duplicate research and development. The article first introduces the concept of the internet of vehicles, and then uses patent analysis methods to analyze the macro development trend of the internet of vehicles patents from the perspectives of patent application trends, patent geographical distribution, patent applicants, etc. It identifies the characteristics of patent layout in the segmented fields of the internet of vehicles in China and the necessary patent risks in the field of communication standards for the internet of vehicles. Finally, suggestions for the development of the internet of vehicles patents are provided, to provide reference for domestic related enterprises in their patent strategies and research and development directions in this field. References | Related Articles | Metrics

Design and Research

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The Online Detection Platform of Engine Abnormal Noise Based on GS-SVM YANG Xingguo 2023, 48(20): 39-45.  DOI: 10.16638/j.cnki.1671-7988.2023.020.009 Abstract ( )   PDF (1355KB) ( )   In order to solve the problems of high labor intensity, low work efficiency and fluctuating accuracy rate in engine abnormal noise recognition using manual auscultation, this paper proposes an online detection technology for engine abnormal noise based on grid search- support vector machine (GS-SVM). The platform mainly includes functions such as speed monito- ring, signal acquisition, signal denoising, feature extraction, and pattern recognition, and the LabVIEW software is responsible for monitoring engine speed and collecting signals, and transmitting the signals to the MATLAB interface. Firstly, the wavelet correlation filtering method is used to remove background noise in MATLAB software; Then, wavelet packet transform and bispectral estimation are used to extract signal features, and the normalized signal features are used as input vectors for support vector machine pattern recognition; Next, select the classifier-support vector machine (C-SVC) and radial basis function (RBF), and use an improved grid search method to optimize the parameters c and g to establish a classification model; Finally, use the trained and mature model to predict the type of abnormal noise. After testing, the accuracy of this method is over 90%, which has a certain engineering significance. References | Related Articles | Metrics

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Design of Anti Fatigue Driving System for Trucks PANG Xiaolan 2023, 48(20): 46-50.  DOI: 10.16638/j.cnki.1671-7988.2023.020.010 Abstract ( )   PDF (1155KB) ( )   This paper elaborates from three aspects,the detection of driving state, the judgment of fatigue and the design of anti-fatigue device. First, the truck driver's state information is collected, and then transmitted to the system host to judge whether the driver is tired. When the judgment exceeds the threshold, the signal can be transmitted to the actuator, and the actuator such as light- emitting diode (LED) light flashing, buzzer and seat vibration will give the driver a warning of fatigue driving at the same time, so as to wake the driver up. This paper provides a practical scheme for a truck to prevent fatigue driving, reduce the phenomenon of fatigue driving, reduce the traffic accident rate, and ensure the safety of traffic travel. References | Related Articles | Metrics

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Design and Research of FSAE Racing Suspension AN Jiachen 2023, 48(20): 51-58.  DOI: 10.16638/j.cnki.1671-7988.2023.020.011 Abstract ( )   PDF (1642KB) ( )   Based on the formula society of automotive engineers (FSAE) competition rules, the requirements of the race on the suspension performance of the racing car are analyzed, the relevant dynamic parameters are calculated, the form of the suspension system is determined and modeled in CATIA. In ADAMS, the kinematics model of the suspension is constructed, and the variation range of the relevant performance index parameters of the suspension model during the wheel jump analysis is analyzed. The simulation results show that the designed suspension system meets the requirements of the rules, but the wheel alignment parameters change greatly with the vertical displacement of the wheel, which is not conducive to the handling stability. In ADAMS/Insight, the design of experimen (DOE) analysis and optimization of the hard point coordinates of the model are carried out based on the positioning parameters of the wheels. The comparison results show that the amount of change in wheel alignment parameters when the wheel runout after optimization is significantly reduced, and the performance of the car is well improved. References | Related Articles | Metrics

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The Design of a Certain Sedan's Disc Brake SUN Shuai 2023, 48(20): 59-64.  DOI: 10.16638/j.cnki.1671-7988.2023.020.012 Abstract ( )   PDF (1280KB) ( )   The optimization design of a certain car's braking system based on the vehicle matching aims to simplify the brake design process while meeting relevant regulations. By integrating the vehicle performance parameters with the design of disc brakes, a design strategy for disc brakes is formulated. Through calculations of the maximum braking torque on each wheel during the braking process and selecting the synchronous adhesion coefficient for the car, the key design parameters and materials for the main components of the disc brakes are determined and verified to comply with the requirements of relevant regulations. Finally, computer aided design (CAD) and UG software are utilized to complete the drawing of main parts and three-dimensional modeling. This optimized the design process of automotive brakes while meeting the requirements of relevant regulations, and lays the foundation for subsequent research on brake noise and other issues. References | Related Articles | Metrics

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Structure Design of Automobile B-pillar Based on Multi-work Condition in Side Impact CUI Ketian 2023, 48(20): 65-70.  DOI: 10.16638/j.cnki.1671-7988.2023.020.013 Abstract ( )   PDF (2564KB) ( )   The study of multidimensional optimization B-pillar aims to deal with the problems of complex, high probability and high risk side impact in actual road. Based on the interpretation of relevant regulations and standards of passive safety about side impact in China, the requirements and characteristics of working conditions are summarized, to conclude the characteristic of B-pillar design in side impact, and come up with the design idea of B-pillar deformation mode. Combined with the actual development case of an sport utility vehicle (SUV) mode, the B-pillar compatibility is designed considering all the requirements of side working conditions, proposed an economical and effective design plans with validated. The design idea can provide reference for the design of B-pillar structure to other vehicles. References | Related Articles | Metrics

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Design and Analysis of Aerodynamic Package for Formula Racing XU Tianhua 2023, 48(20): 71-76.  DOI: 10.16638/j.cnki.1671-7988.2023.020.014 Abstract ( )   PDF (2382KB) ( )   The aerodynamic package provides reliable downforce for formula racing while also playing a role in tidying up turbulence. This article analyzes the design of the aerodynamic package based on computational fluid dynamics. The finite element method is used to calculate the impact of flaps at different angles of attack, analyze the benefits of different grid models, and optimize the design of the aerodynamic package for formula racing vehicles. It is found that using the Poly-Hexcore grid model has the lowest computational time and the best benefits for some airfoils. The causes of tail vortex generation are analyzed and dealt with by arranging tail gaps. This article aims to design the aerodynamic package for formula racing with the goal of high aerodynamic performance and illustrates the optimization process, providing a theoretical basis for the design of the vehicle's empty jacket. References | Related Articles | Metrics

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Analysis of Transmission Cooling and Lubrication Demand and Optimization of Flow Distribution MA Xingyu 2023, 48(20): 77-81.  DOI: 10.16638/j.cnki.1671-7988.2023.020.015 Abstract ( )   PDF (2367KB) ( )   This article proposes an equivalent calculation method for the equivalent liquid flow length and equivalent liquid flow diameter of different shapes of lubricating oil passages in the transmission during the forward development and design process of transmission products, taking into account the heat dissipation requirements of some components such as bearings and clutches in the mechanical body of the transmission. This is used as the basis for setting parameters in the simulation model, the cooling lubrication flow rate in the hydraulic lubrication system of the transmission is simulated using AMESim simulation software, and the flow distribution status under the maximum power, maximum speed, and maximum torque conditions of the transmission is calculated. The final flow distribution plan is determined through continuous iterative calculations. References | Related Articles | Metrics

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Study on the Application Method of Drive Axle Efficiency ZHANG Huapeng 2023, 48(20): 82-87.  DOI: 10.16638/j.cnki.1671-7988.2023.020.016 Abstract ( )   PDF (3004KB) ( )   The efficiency of the drive axle changes constantly with changes in input torque and speed. In order to improve its accuracy in vehicle performance calculation applications, by exploring the variation law of the system resistance torque under transient conditions of the drive axle, a formula for the variation of the drive axle resistance torque and input torque and speed is established to achieve accurate calculation of the drive axle efficiency under dynamic working conditions. By verifying the accuracy of several existing sets of drive axle resistance torque results, it is shown that the transient efficiency calculation formula of the drive axle established through the resistance torque method not only simplifies the difficulty of system calculation, but also improves the accuracy of vehicle performance calculation. It can be extended to the efficiency calculation of other system efficiency calculation, and can also simplify the number of test points for drive axle efficiency. References | Related Articles | Metrics

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Optimization Design of Grille Insect-proof Net for a Heavy Truck ZHAO Can 2023, 48(20): 88-92.  DOI: 10.16638/j.cnki.1671-7988.2023.020.017 Abstract ( )   PDF (2490KB) ( )   Insect-proof net is an important part to protect the water tank and condenser. The insectproof net described in this paper is a metal insect-proof net assembled in the inside of the grille. In order to solve the problems of insect-proof net falling off and uneven assembly, this paper compares the installation methods of insect-proof net for a variety of domestic and foreign models. After sample test and assembly of sample vehicles, combined with the structural characteristics, production and assembly cycle, cost and other factors of sample parts, the hot melt welding connection method is finally determined as the optimal installation method at present, and the specific performance of the screw fixed insect-proof net scheme is compared. The advantages and disadvantages of the hot melt welding scheme are summarized, and the problems of glue leakage and adhesion are solved by using baffle and laminate and reasonable layout of hot melting point through technical optimization. References | Related Articles | Metrics

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Lightweight Design of a Light Truck Battery and Fixed Support KUANG Jiangxiu 2023, 48(20): 93-96.  DOI: 10.16638/j.cnki.1671-7988.2023.020.018 Abstract ( )   PDF (4111KB) ( )   To implement the national energy-saving and emission reduction policy requirements, carry out research and design on vehicle lightweight, reduce the curb weight of light trucks, and improve fuel economy performance, a light truck in this article uses a new type of lithium battery instead of the traditional lead-acid battery, and carries out extrusion resistance test, impact resistance test and cold start test. The test results meet the target requirements, and the weight of the battery is reduced to 5.5 kg, achieving a weight loss of 15 kg. At the same time, computer aided engineering (CAE) simulation software is used to carry out lightweight design of the battery fixing bracket, and the acceleration data of the battery bracket under the real vehicle is used as the input incentive to carry out CAE strength analysis. The test results meet the target requirements, and the weight is reduced by 1.2 kg, and the lightweight effect is remarkable. References | Related Articles | Metrics

Testing and Experiment

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Optimization on the Problem of Low-frequency Road Noise and Booming for a MPV Model HUANG Chaoyong 2023, 48(20): 97-101.  DOI: 10.16638/j.cnki.1671-7988.2023.020.019 Abstract ( )   PDF (1950KB) ( )   In view of the low-frequency road noise and booming problem in the development process of a multi-purpose vehicle (MPV), the transmission path and response of the vehicle are analyzed, and it is determined that the roar problem is caused by the modal of tailgate and the road excitation resonance. The optimization effect of the tailgate limit block stiffness, the tailgate dynamic vibration absorber and the tailgate composite body solutions (CBS) are studies in this paper. Finally, the solution of adding the tailgate CBS is selected to solve the problem of low-frequency road noise and booming, and effectively improve the riding quality of the vehicle. References | Related Articles | Metrics

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Failure Analysis and Improvement Countermeasures of Clock Spring of Commercial Vehicles WANG Kun 2023, 48(20): 102-105.  DOI: 10.16638/j.cnki.1671-7988.2023.020.020 Abstract ( )   PDF (1768KB) ( )   Shaanxi Heavy Duty Automobile Company Limited, Xi'an 710043, China References | Related Articles | Metrics

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Early Fault Diagnosis of Electric Drive Assembly Durability Test DING Xu 2023, 48(20): 106-109.  DOI: 10.16638/j.cnki.1671-7988.2023.020.021 Abstract ( )   PDF (2369KB) ( )   In order to study the early faults of the electric drive assembly of new energy vehicles, early fault analysis equipment is used to monitor the vibration of the durability test of the electric drive assembly of new energy vehicles. The results of theoretical analysis and actual monitoring indicate that the early fault analysis equipment accurately predicted the trend of damage at the fault location. Accurately diagnose early faults of the electric drive assembly, it can terminate the test timely, avoid transitional damage to the sample and bench, and quickly locate the fault location to shorten the product development cycle. References | Related Articles | Metrics

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Fault Diagnosis of Automobile Transmission System Based on Autoregressive Moving Model FU Xiaodan 2023, 48(20): 110-116.  DOI: 10.16638/j.cnki.1671-7988.2023.020.022 Abstract ( )   PDF (1498KB) ( )   Aiming at the complex fault set of automobile transmission system, a fault diagnosis algorithm based on autoregressive moving model is proposed. Based on the random difference theory, the timing model of the fault signal is constructed, and various parameters affecting the sequence value are determined. The original fault data is collected, and A/D conversion and data standardization are carried out. In order to retain the original features of the discrete data and reduce the interference of system noise, two-dimensional texture images are formed by using the concept of data dimension enhancement. Local binary feature operators are used to extract the details of two- dimensional images. The experimental results show that the proposed algorithm has better fault feature classification performance and sample test consistency, with an average diagnosis accuracy of 99.27%. References | Related Articles | Metrics

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Analysis of a New Energy Vehicle Control Arm Bushing Rattling Problem GAO Long 2023, 48(20): 117-121.  DOI: 10.16638/j.cnki.1671-7988.2023.020.023 Abstract ( )   PDF (1767KB) ( )   In the winter environment of a new energy model in the northern market, the conventional small rolling road conditions and braking conditions will appear "squelch" abnormal noise. The paper uses fault tree analysis to analyse and verify the vehicle's operating environment, bushing structure and other aspects, and identifies the bushing structure as the main cause of the noise. After the improvement of the bushing structure, performance tests related to the bushing are conducted, such as low temperature pull-off force, bushing stiffness, fatigue endurance, comprehensive road test and other related performance verification. Simultaneously, the vehicle's handling stability and driving comfort are also verified to ensure that the bushing structure change do not cause significant changes in other performance. Finally, the aftermarket complaint rate is monitored: six months after the changeover is completed, the number of complaints in the aftermarket had effectively dropped from 116 between January and March of the first year to one between January and March of the second year, a significant reduction in the complaint rate, thus demonstrating the effectiveness of the programme. References | Related Articles | Metrics

Process·Materials

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Development and Application of Welding Fixture Hole Group Tool Based on Secondary Development LI Renjun 2023, 48(20): 122-125.  DOI: 10.16638/j.cnki.1671-7988.2023.020.024 Abstract ( )   PDF (1197KB) ( )   Hole feature combination (short for: hole group) form which design characteristics are heavy workload but simple repetition is widely applied in the design of automotive welding fixture. To improve the design efficiency of hole group in automotive welding fixture, programs a rapid designing application tool for automotive welding fixture hole group based on CATIA Automation secondary development technology. This application tool can improve the design efficiency of automotive welding fixture hole group greatly. By the test verification in the real design atmosphere, the hole group tool improves the design efficiency nearly 70%. Furthermore, the research in this paper lays a certain foundation for the intelligent design of welding fixture in the future. References | Related Articles | Metrics

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Performance Analysis of a Heavy Vehicle Air Compressor Alternative Pipe Material FENG Lei 2023, 48(20): 126-129.  DOI: 10.16638/j.cnki.1671-7988.2023.020.025 Abstract ( )   PDF (1455KB) ( )   Heavy duty truck air compressor ventilation pipe material, usually using precision colddrawn galvanized seamless steel pipe reprocessing, reprocessing and transportation of the pipe surface coating is easy to be scratched, rust resistance decline, at the same time electroplating passivation process will produce a lot of waste liquid, affecting the environment. Aluminum alloy material itself has a good corrosion resistance, through the bending performance of aluminum alloy seamless pipe, corrosion resistance, sealing, heat resistance and economic and other aspects of the comparative analysis, aluminum alloy seamless pipe meets the requirements of air compressor ventilation pipe, is a good alternative pipe material for air compressor steel pipe. References | Related Articles | Metrics

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Application of Automatic Grinding Technology in Battery Tray Manufacturing LIU Junjie 2023, 48(20): 130-133.  DOI: 10.16638/j.cnki.1671-7988.2023.020.026 Abstract ( )   PDF (1522KB) ( )   As battery carrier, the quality of battery tray is related to the service life of battery system, the burr and splash generated will impact installation of battery tray and need grinding. This paper mainly analyzes the auto grinding use in the manufacturing process of battery tray, combine with the grinding example and the current status of grinding technology, introduce the automatic grinding station scheme and system composition based on a certain project. From the necessity of the grinding use in battery tray building, the automatic grinding technology use in the grinding process, the layout of the grinding station, etc., it is analyzed to provide reference and guidance for the subsequent battery tray line. References | Related Articles | Metrics

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Robot Flexible Total Assembly Technology Application in the Welding Line of Lveco in Nanjing ZHU Yu 2023, 48(20): 134-139.  DOI: 10.16638/j.cnki.1671-7988.2023.020.027 Abstract ( )   PDF (2628KB) ( )   In the process of automobile body manufacturing, the total welding technology of body in white is the most important to ensure the quality of the whole vehicle assembly. This paper introduces several forms of flexible assembly of automobile body in white, and emphatically analyzes the application of robot flexible assembly in the total welding line of Nanjing Iveco automobile products, by use of the existing resources and reasonable process layout to improve the production technology level and welding quality of automobile body in white. References | Related Articles | Metrics

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Development of a Novel Painting and Spraying Robot for Prototyping and Film Debugging GAO Kongchang 2023, 48(20): 140-144.  DOI: 10.16638/j.cnki.1671-7988.2023.020.028 Abstract ( )   PDF (2916KB) ( )   According to the steps that need to be done by the spraying robot in the automobile coating plant to introduce the new model, the formulation of spraying trajectory, offline profiling programming, on-site teaching, paint film debugging and other aspects are introduced in detail. At the same time, the problems encountered in the development process are analyzed, and the corresponding solutions are put forward to make the paint appearance quality of the new model meet the standard, Finally, it ensures the smooth production of new models in the automobile coating plant. References | Related Articles | Metrics

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Optimization of Process Parameters of Module Laser Welding with DOE Based on Minitab FAN Yuyang 2023, 48(20): 145-150.  DOI: 10.16638/j.cnki.1671-7988.2023.020.029 Abstract ( )   PDF (1478KB) ( )   In recent years, with the development of technology, the application of laser welding is gradually popularized, and laser welding is widely used in manufacturing industry, especially automobile manufacturing industry. At present, laser welding is widely used in lithium-ion battery manufacturing, such as module Busbar welding. Laser welding has many advantages, such as high welding speed, small deformation and high precision, it also has higher requirements for tooling and welding parameters. Reflective lens and other components, different equipments have similar welding properties, and welding parameters have mutual influence, which jointly affect the welding quality. In order to obtain better welding quality, in addition to the basic functional performance acceptance of new equipment, the influence between equipment parameters should be further obtained, so it is necessary to verify the parameters of laser welding equipment in an all-round way. It has become an important research aspect for welding process engineers to carry out multi-factor parameter verification tests and study the influence of the interaction between equipment parameters on welding quality. In this paper, the commonly used welding parameters are selected for design of experimen (DOE) verification, and the degree of factor interaction is obtained, and the theoretical optimal solution is calculated and optimized by Minitab tool. References | Related Articles | Metrics

Automobile Education

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Research and Practice on the Construction of Supporting Resources for Automobile Insurance and Claims Teaching Materials GUO Jie 2023, 48(20): 151-154.  DOI: 10.16638/j.cnki.1671-7988.2023.020.030 Abstract ( )   PDF (1185KB) ( )   With the rapid development of the digital publishing industry and the requirements of the Action Plan for Improving the Quality and Excellence of Vocational Education (2020－2023), the form of supporting resources for traditional vocational education textbooks is relatively single, which is no longer suitable for the current educational development and the needs of readers. The innovative construction of supporting resources for textbooks brooks no delay. This article takes automobile insurance and claims settlement as an example, and through the research and analysis of teaching material supporting resources, forms a professional curriculum design idea with promotional significance, providing useful reference for the development of teaching material supporting resources in higher vocational education. References | Related Articles | Metrics

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Exploration of SCM Principle Course Reform in Automotive Major in Higher Vocational Colleges WANG Xinyan 2023, 48(20): 155-159.  DOI: 10.16638/j.cnki.1671-7988.2023.020.031 Abstract ( )   PDF (1122KB) ( )   Single-chip microcomputer principle course is a basic course of automobile specialty. Through the analysis of the teaching status of this article, it is found that there are some problems in the actual teaching process. Combined with the typical application scenarios of automobile, the traditional teaching content is reconstructed logically, the hardware design is from easy to difficult, and the experiment is suitable for automobile application. In view of the curriculum schedule arrangement in the talent training program of higher vocational college students, taking into account the influence of the previous course, the actual teaching method is optimized to ensure the continuous level of teaching content. Adjust the proportion of time management hours, make the course teaching inclined to experimental teaching, explore new teaching mode, reasonable use of simulation software to improve the effect and quality of online teaching, and finally adopt diversified assessment methods for evaluation. Practice has proved that the curriculum reform has improved students' learning enthusiasm, cultivated engineering practice ability and broadened employment channels. References | Related Articles | Metrics

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Exploration and Practical Research on Curriculum Ideological and Politics of 5S Management in Production Sites REN Xuejiao, WANG Jiaming 2023, 48(20): 160-163.  DOI: 10.16638/j.cnki.1671-7988.2023.020.032 Abstract ( )   PDF (1144KB) ( )   Cultivating university students with strong ideological and political qualities is an essential component of current national talent cultivation. Against this backdrop,how to organically integrate ideological and political elements into professional courses has become a worthy topic of exploration. This article takes 5S management in production sites as a carrier to conduct in-depth research on how to tap into ideological and political elements in the course. This article first analyzes the overall structure of the course, and then provides rich implementation cases from five aspects: cultural confidence, philosophical thinking, professional ethics, scientific methods, and quality education. Finally, it discusses and summarizes effective ways to integrate ideological and political elements into professional courses from the perspectives of top-level design, evaluation mechanism, and teacher literacy. This study can provide reference for the implementation of ideological and political courses in other similar universities. References | Related Articles | Metrics

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Course Reform of Vehicle Engineering under the Background of New Energy Vehicles LU Cunhao 2023, 48(20): 164-167.  DOI: 10.16638/j.cnki.1671-7988.2023.020.033 Abstract ( )   PDF (1223KB) ( )   Under the background of the rapid development of the domestic new energy vehicle industry, domestic undergraduate universities have carried out corresponding reforms on professional courses in vehicle. However, the phenomenon of simply cutting traditional courses and adding new courses in the professional course reform has led to the incoherence of the traditional professional course knowledge system and the inability to establish strong knowledge links between new professional courses and pilot courses. This situation can easily lead to students' difficulties in classroom learning, decreased autonomy in learning, decreased quality of education, and difficulties in employment. Taking the traditional vocational course automotive engine as an example, this paper conducts research on the curriculum reform of the automotive major. Based on the perspective of application of learning and gradual learning, several suggestions for curriculum reform are proposed during the transition period from traditional professional courses to new energy vehicle courses. These suggestions aim to ensure students' solid knowledge system, deepen their understanding andapplication of professional theoretical knowledge, and ease employment pressure. References | Related Articles | Metrics

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Teaching Reform of Automobile Marketing Professional Courses Based on Vocational Education Informatization LI Jing 2023, 48(20): 168-172.  DOI: 10.16638/j.cnki.1671-7988.2023.020.034 Abstract ( )   PDF (1015KB) ( )   Contemporary information technology has triggered a powerful fission in education and teaching on the basis of traditional cultural education. Informatization has become an important way for vocational education reform, accelerating the construction of educational information infrastructure, promoting the further integration of information technology and curriculum teaching, and providing opportunities and directions for curriculum reform.Starting from the reform of education and teaching in the information age, based on the current development status, existing problems, and challenges of vocational education informationization, this paper explores the informationization teaching mode of automobile marketing professional courses, further strengthens the development and application of high-quality educational resources, accelerates the process of education informationization, and promotes the informationization teaching reform of courses. References | Related Articles | Metrics

Standards·Regulations·Management

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Safety Analysis of Unsignalized Road Sections Based on Vehicle Headway GUO Lun 2023, 48(20): 173-177.  DOI: 10.16638/j.cnki.1671-7988.2023.020.035 Abstract ( )   PDF (1224KB) ( )   On the road section without signal control, pedestrian crossing behavior is an important factor that interferes with the normal driving of mixed traffic flow. Disturbed vehicles are usually accompanied by drivers' driving behaviors such as rapid acceleration and rapid deceleration, which will cause unnecessary increase in vehicle energy consumption. In this paper, aiming at the influence of pedestrians crossing the street on mixed traffic flow on the road section, the relationship between pedestrian crossing time and headway is analyzed, and the road safety is classified according to the results of road safety questionnaire survey, so that the safety analysis model of the road section without signal based on headway is put forward, and the feasibility of the model is verified by solving an example. The results show that the road safety analyzed by the model is in good agreement with the analysis results based on the headway distribution and the subjective safety feeling results of pedestrians crossing the street. With the improvement of road safety, the rapid acceleration and deceleration of mixed traffic flow are significantly reduced, which can provide some reference for the study of ecological driving concept under mixed traffic flow. References | Related Articles | Metrics

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Research on Dynamic Control of Intelligent Traffic Signal Lights GAO Xin 2023, 48(20): 178-184.  DOI: 10.16638/j.cnki.1671-7988.2023.020.036 Abstract ( )   PDF (2766KB) ( )   In response to the problem of low traffic efficiency at intersections in the city due to the traditional rotation of traffic lights, this article proposes to rely on intersection camera image recognition technology and intelligently control the direction and duration of the intersection based on the dynamic data of vehicles queuing at each intersection. Considering that people want to queue as little as possible while not wanting their own queue length to be much longer than others' queue length, this article comprehensively considers minimizing the total queue length at intersections and minimizing the variance of queue length in each direction. The control strategy that minimizes the final result by weighting and summing the two factors is the optimal strategy. In order to compare with the alternate traffic strategy, this article uses computer generated simulation data based on field observations to calculate and compare, in order to achieve the optimal dynamic control strategy for intelligent traffic signals. References | Related Articles | Metrics

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Current Situation and Countermeasures of Electric Vehicle Maintenance Industry TANG Liping 2023, 48(20): 185-188.  DOI: 10.16638/j.cnki.1671-7988.2023.020.037 Abstract ( )   PDF (1024KB) ( )   The rapid development of electric vehicles has brought opportunities and challenges to the traditional automotive maintenance industry. Compared to traditional fuel vehicles, the transmission system of electric vehicles is composed of motors, batteries, and electronic controls, and has a highly integrated feature. This requires professional electric vehicle maintenance personnel and complete supporting facilities. At present, the contradiction between the rapid increase in the ownership of electric vehicles and the shortage of related supporting facilities in the electric vehicle maintenance industry is becoming increasingly prominent, seriously hindering the healthy development of the automotive maintenance industry's aftermarket. Therefore, it is necessary to analyze the development status and existing problems of the electric vehicle maintenance industry, providing theoretical reference for establishing and improving the maintenance system of the electric vehicle industry. This article analyzes the existing problems in the electric vehicle maintenance industry from three aspects: market, maintenance equipment, and talent. Based on the above analysis, it proposes three development suggestions: standardizing the electric vehicle maintenance market, updating the electric vehicle inspection and maintenance equipment, and emphasizing the cultivation of electric vehicle maintenance talent. References | Related Articles | Metrics

Reviews

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Research Progress on the Impact of Driving Behavior on Ecological Driving SHEN Yubo 2023, 48(20): 189-192.  DOI: 10.16638/j.cnki.1671-7988.2023.020.038 Abstract ( )   PDF (1230KB) ( )   Ecological driving improves fuel economy and reduces vehicle emissions by changing the driver's driving behavior, such as starting smoothly, avoiding sharp acceleration and deceleration, and avoiding prolonged idling. In order to clarify the impact of driving behavior on ecological driving, this paper sorts out the research status of driving behavior and ecological driving by domestic and foreign scholars in recent years, and introduces the ecological driving assistance system that applies ecological driving technology in practice. Combined with the ecological driving research method of fuel vehicles, the ecological driving behavior of pure electric buses is analyzed. It is found that driving behaviors such as increasing vehicle speed, avoiding low-speed driving, controlling acceleration in a small range, and slowly pressing the accelerator pedal can effectively reduce fuel consumption and achieve energy saving and emission reduction, and for pure electric vehicles, excess energy can be recovered through reasonable braking and deceleration. It provides a new idea for evaluating the driver's ecological driving behavior and improving the level of ecological driving. References | Related Articles | Metrics

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Analysis of Development Status and Prospect of New Energy Vehicles ZHAI Jiatian 2023, 48(20): 193-198.  DOI: 10.16638/j.cnki.1671-7988.2023.020.039 Abstract ( )   PDF (1306KB) ( )   With the progress of social development, China has continuously increased its requirements for vehicular exhaust emission. New energy vehicles, as a new, eco-friendly, and efficient industry, conforms to the concept of green energy and can effectively reduce environmental pollution. In recent years, the technology level of new energy vehicles has continuously improved, and the overall performance of vehicles has greatly increased. At the same time, under the full support of the national government, the new energy vehicle industry has developed rapidly, and the market scale has continued to expand. This article provides a comprehensive analysis of the current development status of China's new energy vehicle industry, summarizes the existing problems, and puts forward targeted and reasonable suggestions, aiming to provide valuable reference for promoting the long-term development of China's new energy vehicle industry. References | Related Articles | Metrics