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15 January 2023, Volume 48 Issue 1 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Research on the Development Status and Countermeasures of Fuel Cell Vehicles in Shaanxi Province FU Pei 2022, 48(1): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2023.001.001 Abstract ( )   PDF (385KB) ( )   The development of fuel cell vehicles is of great significance to alleviate the energy shortage crisis and environmental pollution pressure. In recent years, Shaanxi province has issued number of relevant policies to promote the development of hydrogen energy and fuel cell vehicles, and continue to promote the development of hydrogen energy and fuel cell vehicles. By sorting out and analyzing the technological development status and existing problems of fuel cell vehicle industry in Shaanxi province, this paper draws the technology development strategy of fuel cell vehicle industry in Shaanxi province, and puts forward corresponding implementation measures and policy suggestions. References | Related Articles | Metrics

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Regenerative Braking Control Strategy for Electric Vehicle XU Haitong 2022, 48(1): 5-10.  DOI: 10.16638/j.cnki.1671-7988.2023.001.002 Abstract ( )   PDF (779KB) ( )   Aiming at the energy recovery problem of a front-drive electric vehicle, this paper proposes a braking energy recovery control strategy based on look-up table method. Based on economic commission of europe (ECE) regulations, I curve and front and rear braking force distribution method of f line group with road adhesion coefficient of 0.7, the braking energy recovery control stategy was designed according to five influencing factors including accelerator pedal displacement, brake pedal displacement, vehicle speed, battery state of charge (SOC) and braking strength. AVL Cruise was used to build the vehicle model, and Matlab/Simulink was used to build the braking energy recovery control strategy model. In the new european driving cycle (NEDC) condition, the designed braking energy recovery control strategy was jointly simulated and verified whether it will be correct .The simulation results show that the control strategy designed in this paper meets the requirements of braking stability and safety, and recovers braking energy, and improves battery SOC,Braking energy recovery is up to 18%. References | Related Articles | Metrics

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Design of Power Battery Active Balance Offline Equipment LIU Qiongqiong 2022, 48(1): 11-16.  DOI: 10.16638/j.cnki.1671-7988.2023.001.003 Abstract ( )   PDF (1027KB) ( )   : In view of the problems of shortened cruising range and frequent charging caused by the inconsistency of the new energy vehicles power battery, an offline maintenance device based on active equalization control is designed, and a bidirectional direct current-direct current (DC-DC) converter is used as the core of the equalization module, and an open circuit voltage (OCV) as the equalization control variable, and the equalizing current can be automatically adjusted according to the voltage difference threshold to realize the energy transfer between the single cells. The test data shows that the device can control the balance voltage difference within 50 mV, and the balance current can be increased to 20 A, which effectively reduces the inconsistency between cells and improves the efficiency. References | Related Articles | Metrics

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The Dynamics Simulation of Plug-in Hybrid Electric Vehicle Based on Simulink LI Yewei 2022, 48(1): 17-21.  DOI: 10.16638/j.cnki.1671-7988.2023.001.004 Abstract ( )   PDF (1667KB) ( )   This paper takes the existing hybrid electric vehicle as the research object, it presents a construction method for plug-in hybrid electric vehicle powertrain, Simulink software is used to establish the rotation speed module and torque module of driving motor, engine and other main components, it establishes dynamic model by Simulink software. In this article, new european driving cycle (NEDC) and uniform acceleration conditions are simulated and analyzed, this paper verifies the feasibility of the designed power system of plug-in hybrid electric vehicle, this design makes full use of the external electric energy input, and adopts the control strategy of limiting the working range of the engine. Under the premise of engine auxiliary power output, it drives the generator to generate electricity, it increases the cruising range of the electric vehicle, and effectively reduces the fuel consumption and pollutant emissions of the vehicle, and plays the purpose of energy saving and emission reduction. References | Related Articles | Metrics

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Analysis of Oil Temperature Prediction Model for Hybrid Vehicle Gearbox WU Guangyao 2022, 48(1): 22-26.  DOI: 10.16638/j.cnki.1671-7988.2023.001.005 Abstract ( )   PDF (982KB) ( )   The performance of the transmission has an inevitable relationship with the oil temperature of the transmission. For some hybrid vehicles at present, there is only one gear of the transmission, and there is no shifting condition and no clutch. Therefore, the heat generated by sliding friction during gear shifting does not exist in this hybrid vehicle. For this hybrid structure vehicle, in order to reduce the manufacturing cost of the whole vehicle, a control model for predicting the transmission oil temperature is developed, which covers many aspects of the heat generation and heat dissipation of the transmission oil. Then, through the data calibration and matching of the real vehicle, the road test compares the predicted temperature and the actual data of the oil temperature sensor. The temperature difference between the two can be controlled within 10 ℃, which has achieved good test results and meets the development requirements. References | Related Articles | Metrics

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The Matching Calculation of Power System of a Hybrid Electric Vehicle WANG Junyan 2022, 48(1): 27-30.  DOI: 10.16638/j.cnki.1671-7988.2023.001.006 Abstract ( )   PDF (902KB) ( )   This paper based on a hybrid electric vehicle as the research object, it designs the power transmission scheme, the parameters of motor and internal combustion engine are calculated in this paper, the dynamic performance and energy recovery are studied in this paper, this paper carries on the simulation analysis of city-suburb conditions, the simulation results show that the design of the hybrid electric vehicle can meet the requirements of driving power performance, In this study, the backup power of internal combustion engine is significantly reduced, the fuel economy is significantly improved, the energy recovery of braking and backup power of internal combustion engine is excellent, and the energy utilization rate is excellent, this paper provides a research idea for the research of hybrid electric vehicle in this aspect. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Design of Variable Transmission Ratio Based on Optimization of Simulated Annealing Algorithm CHEN Zheming 2022, 48(1): 31-37.  DOI: 10.16638/j.cnki.1671-7988.2023.001.007 Abstract ( )   PDF (1792KB) ( )   Aiming at the research of steer by wire system vehicle, the variable transmission ratio algorithm is designed based on the constant yaw rate gain method, and the algorithm is improved and revised according to its system structure and design purpose. The comprehensive evaluation index function of handling stability is selected as the objective function of the optimization algorithm, and the constant gain is optimized by the simulated annealing algorithm to obtain the global optimal value. And take the optimal value as the design basis for the final transmission ratio algorithm. Simulate analyzing the transmission ratio algorithm. The results show that the optimized transmission ratio algorithm SBW vehicle has better steering performance. And the algorithm can effectively reduce the operating burden of the driver. References | Related Articles | Metrics

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Analysis of the Decision Strategy of Intelligent Connected Vehicle Driving at Intersections WANG Jianmin 2022, 48(1): 38-43.  DOI: 10.16638/j.cnki.1671-7988.2023.001.008 Abstract ( )   PDF (885KB) ( )   The autonomous driving of intelligent connected vehicles is divided into three parts: perception, planning and execution. Behavioral decision is one of the core technologies for the development of autonomous driving. In complex traffic intersections, it is difficult to predict the driving route of vehicles, so reasonable and safe driving behaviors can be designed by analyzing the condition statistics of vehicle behaviors at intersections. In this paper, the intelligent connected vehicle as the research object, so that the vehicle to the intersection lane change, turn, u-turn and other behaviors corresponding to the driving scene, can ensure the intelligent connected vehicle safe, reasonable driving in a certain range of control at the complex intersection. Driverless vehicles at the crossroads improve the driving efficiency and reduce operating costs, bring people more convenient and comfortable services, promote the intelligent connected vehicle more comprehensive development. References | Related Articles | Metrics

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Simultaneous Localization and Mapping Method Based on LeGO-LOAM in Actual Scenarios CUI Yang 2022, 48(1): 44-47.  DOI: 10.16638/j.cnki.1671-7988.2023.001.009 Abstract ( )   PDF (1505KB) ( )   Simultaneous localization and mapping is one of the key technologies to realize unmanned driving in unmanned driving technology. The accuracy and applicability of mapping still need to be further improved. In this paper, the loop closure detection part of the LeGO-LOAM (Lightweight and Groud-Optimized Lidar Odometry and Mapping) algorithm is improved, the KD (K-Dimensional) tree is combined with the context scanning algorithm, and the external parameters of the radar-inertial measurement unit (IMU) are re-calibrated. By establishing an actual scene and comparing the adjusted algorithm with the previously unadjusted algorithm, it can be seen that the mapping accuracy and applicability of the adjusted algorithm have been significantly improved. References | Related Articles | Metrics

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Simulation of Vehicle Active Lane Change Based on Adaptive Cruise Control FU Peng 2022, 48(1): 48-51.  DOI: 10.16638/j.cnki.1671-7988.2023.001.010 Abstract ( )   PDF (1058KB) ( )   The traditional adaptive cruise function can only complete the cruise speed control of the vehicle in a single lane, but can not carry out the active lane change more intelligently. To solve this problem, this paper actively cuts out the lane under the condition of calculating the minimum safe time distance, and uses CarSim/Simulink to conduct simulation verification under the conditions of 80 km/h. Results compared with the adaptive cruise system used by the current mainstream vehicle companies, the vehicle active lane change strategy based on adaptive cruise control (ACC) can meet the requirements of active lane change under the minimum safe time interval, and achieve a good effect of lane change under the set conditions. References | Related Articles | Metrics

Design and Research

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Design of Early-warning Device for Automobile Cooling Liquid Based on CAN-Bus Network LI Yuanyong 2022, 48(1): 52-56.  DOI: 10.16638/j.cnki.1671-7988.2023.001.011 Abstract ( )   PDF (1249KB) ( )   In order to solve the problem that driver can not understand the use of automobile cooling liquid and engine failure due to timely replacement of coolant, this paper analyzes the existing relevant detection technology and alarm technology. Based on the methods of related theoretical research and experimental verification,the automobile cooling liquid early warning device based on controller area network-bus (CAN-Bus) network is proposed and designed. This design scheme is analyzed by experimental validation. The expected early warning effect can be achieved. Can enable drivers to timely understand the real-time situation of the vehicle coolant. At the same time, it can also provide the navigation address of car owners with relevant certified professional coolant replacement service agencies based on Internet big data. It is convenient for the owners to replace the cooling liquid in time. Prevent affecting the normal use of the automobile engine or cause damage to the engine system and the vehicle cooling system. It solves the existing problems of existing vehicles, makes the use of cars safer and more intelligent, and has certain research significance. References | Related Articles | Metrics

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The Logic Analysis of Keyless Starting Control Function Based on the On-board Communication XU Zhishan 2022, 48(1): 57-62.  DOI: 10.16638/j.cnki.1671-7988.2023.001.012 Abstract ( )   PDF (807KB) ( )   Vehicle keyless start control function is one of the comprehensive applications of wireless identification technology and vehicle network technology. Although it improves the safety and convenience of vehicle use, its control signals are complex and diverse. In order to reveal the working principle of the keyless start control system, comply with the sequence action law of digital signals, take the keyless start control system of Mercedes Bens C200 as an example, this paper uses the logic analysis method to fully expatiate “five major” function of the start control system, deeply analyze the transmission path of control signal in vehicle network, gradually unravel the start control logic mechanism, thoroughly rationalize the realization processs of keyless start control function. It not only provides empirical help for automotive electronic product designers to apply keyless start control technology, but also provides a theoretical basis for automotive electronic control technology teaching and experimenters to analyze keyless start control function. References | Related Articles | Metrics

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Final Drive Ratio Selection Strategy of FSAE Racing Car Transmission System Based on CarSim CAO Jiarong 2022, 48(1): 63-68.  DOI: 10.16638/j.cnki.1671-7988.2023.001.013 Abstract ( )   PDF (1040KB) ( )   Virtual simulation of vehicle dynamics is of great significance in vehicle design. Based on the traditional vehicle dynamics theory, combined with CarSim vehicle dynamics simulation software, this paper puts forward a strategy for selecting the final drive ratio of formula society of automotive engineers (FSAE) racing car. According to the calculation method of the dynamic events in the rules of the college students' formula competition, the target score evaluation index is formulated. According to the real vehicle experiment of yixing formula team of xi'an jiaotong university in the 2019, 2020 season, the advantages of the selection strategy of the final drive ratio of the transmission system are verified. The research results provide some guidance for the design of the final drive ratio of FSAE teams. References | Related Articles | Metrics

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Study on Semi-active Suspension Based on Magneto-Rheological Damper LI Qiangfei 2022, 48(1): 69-73.  DOI: 10.16638/j.cnki.1671-7988.2023.001.014 Abstract ( )   PDF (1365KB) ( )   In order to improve the ride comfort of commercial vehicles, this study combined with a commercial truck semi-active suspension system design research. Firstly, the structure of the magneto-rheological (MR) damper is designed, and the structure is optimized with Ansoft finite element analysis software to avoid the under-saturation and over-saturation of the magnetic field strength of the MR damper. Secondly, fuzzy control and proportional integral derivative (PID) control are used to track the damping force of the damper, so that the damping force is always close to the best comfort and safety. Finally, the damping performance of the damper is simulated based on Matlab/Simulink numerical analysis software, and a semi-active suspension system based on MR damper is designed. The MR damper designed in this study has a compact structure and is easy to be integrated. The final simulation results show that compared with the traditional passive suspension, the semi-active suspension has better vibration reduction effect and faster response speed, which makes the vehicle have better ride comfort and driving safety. References | Related Articles | Metrics

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Analysis of the Complex Planetary Drive System for Forced Torsional Vibration Characteristic LIU Wanli 2022, 48(1): 74-81.  DOI: 10.16638/j.cnki.1671-7988.2023.001.015 Abstract ( )   PDF (1569KB) ( )   A lumped-parameter model of complex planetary drive system is built for the forced torsional vibration with lumped-parameter method, which consists of multiple-stage planetary gears, for analyzing the vibration characteristics of multi-stage complex planetary transmission system in the range of common working speed. The differential equations for the model above are derived by the Lagrange equations and solved, and natural frequencies of the system and shape modes for the compound planetary gear set are analyzed in one particular gear shift. The frequency response of all planetary gear sets in planetary transmission excited by the dynamic torque of the engine under different speed is investigated, and finally the time response of the compound planetary gear set and the fluctuation of the meshing force of all gears in compound planetary gear set are revealed. The results show that the vibration of the compound planetary array will be greater within the operating speed range of the system, and the meshing force of the outer ring planetary gear is greater than that of the inner ring planetary gear. References | Related Articles | Metrics

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Design Discussion and Finite Element Analysis of Door Interior Panel WU Lin 2022, 48(1): 82-85.  DOI: 10.16638/j.cnki.1671-7988.2023.001.016 Abstract ( )   PDF (1954KB) ( )   This paper introduces the precautions in the design and development process, especially the location strategy and installation mode of the door interior trim, so as to provide a reference for the design and development of the door trim panel for the subsequent models. The loading requirements of finite element analysis are given. According to the finite element analysis results of three working conditions, it is confirmed that the deformation of working condition 1 exceeds the requirements of the design specification, the solution is given, and the problem is confirmed by finite element analysis again. References | Related Articles | Metrics

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Stiffness Analysis and Optimization Design of Plastic Filler Cap XU Luyao 2022, 48(1): 86-90.  DOI: 10.16638/j.cnki.1671-7988.2023.001.017 Abstract ( )   PDF (1946KB) ( )   The plastic filler cap is mainly to protect the refueling port. When the car is refueling, the plastic filler cap should be able to open and close smoothly.It has a high opening and closing frequency. In order to improve the user's perceived quality, its stiffness is required to be correspondingly high. This paper through the rigidity analysis and research of a development model, based on the stiffness is quite good and size of the similar product structure, material properties, dimensions and numerical analysis, a development model in standard that plate thickness and the height of the gooseneck is too small, cause the stiffness is weak. CAE analysis is used to verify that thickening thickness of hinge plate and hoisting gooseneck height have better effect on stiffness improvement. Finally, the test results show that the design objectives meet the requirements, and the user perception of quality is good. To sum up, the calibration analysis and optimization data from the perspective of forward development can avoid the improvement of mold after mold opening, prolongthe development cycle and increase the cost of mold modification. References | Related Articles | Metrics

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Design of ECU Function Automatic Test System Based on CANoe YU Wenhan 2022, 48(1): 91-95.  DOI: 10.16638/j.cnki.1671-7988.2023.001.018 Abstract ( )   PDF (1370KB) ( )   In order to improve the efficiency of electronic control unit (ECU) bench function testing, an automatic test system is designed. Both controller based on FS32K144-100LQFP microcontroller design and host computer software based on CANoe form this automatic test system. This controller can simulate the input signal of ECU fire and detect the ECU output signal, then send the detected signal out through controller area network (CAN) message. Host computer software can detect CAN messages and other outputs of the ECU to be tested by controlling the programmed power supply and controller. The experimental results show that the test system can simulate all kinds of input signals and detect the signals of the device under test accurately, and facilitate automatic test according to the control instruction of the host computer software, which greatly improves the test efficiency. The controller that communicate through CAN or local interconnect network (LIN) bus facilitate automatic test through this test system. References | Related Articles | Metrics

Testing and Experiment

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Abnormal Noise Elimination of Suspension System of a New Energy Vehicle ZHANG Dejun1 2022, 48(1): 96-99.  DOI: 10.16638/j.cnki.1671-7988.2023.001.019 Abstract ( )   PDF (1034KB) ( )   Aiming at the abnormal sound problem of a suspension system developed for a new energy vehicle, the use of quality control methods, combined with experimental verification statistics, made a comprehensive diagnosis and analysis of the abnormal sound problem. It can be seen from the analysis results,the main reason is the torque attenuation of the bolts at the connection between the swing arm and the sub-frame. After further diagnosis and analysis of the important influencing factors of the fasteners, after the countermeasures are perfected, the abnormal noise of the vehicle chassis is eliminated, which provides a good engineering reference for the anti-recurrence design and elimination of the abnormal noise of the chassis. References | Related Articles | Metrics

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Analysis on NH3 Emission Characteristics of China VI Heavy Duty Diesel Vehicles ZHANG Jinjie 2022, 48(1): 100-103.  DOI: 10.16638/j.cnki.1671-7988.2023.001.020 Abstract ( )   PDF (1317KB) ( )   Taking a China VI heavy-duty diesel vehicle as the research object, the constant velocity and adapted China world transient vehicle cycle (C-WTVC) are performed on the chassis dynamometer, and the NH3 and NOx emissions in the exhaust are detected by portable emission measurement system (PEMS) equipment and fourier transform infrared spectroscopy (FTIR) equipment. The results show that under constant speed conditions, the peak NH3 emission concentration at each speed point appears as the speed increase. The average NH3 emission concentration first decreases and then increases as the speed increases. The average NOx emission concentration increases with the speed increase first, then decrease and then increase. Under C-WTVC, the average NH3 emission concentration is the largest in the high-speed phase, and the average NH3 emission concentration in the urban phase is the smallest. The average NOx emission concentration is low in three phases. The emission factor of NH3 has the same trend as its average emission concentration. References | Related Articles | Metrics

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Research on Vehicle Coasting Test Method Based on Repeatability XIONG Wanquan 2022, 48(1): 104-109.  DOI: 10.16638/j.cnki.1671-7988.2023.001.021 Abstract ( )   PDF (1781KB) ( )   In order to improve the repeatability of vehicle coasting test data, a passenger car is used as the research object to conduct coasting tests on straight performance tracks. A reasonable, feasible, universal and efficient hot car, test and data processing method are proposed. The results show that the relative standard deviation of the arithmetic mean of the 8 round-trip data is small. On this basis, aiming at the minimum relative standard deviation, one datum is removed at a time, and two data is removed in total, the results show the relative standard deviation of the processed data is significantly reduced. The influence of speed deviation from reference vehicle speed Δv on the relative standard deviation is studied, and the results show that the larger the Δv, the smaller the relative standard deviation. This method has been applied to vehicles such as electric inverted three-wheeled vehicles, passenger cars and special vehicles. This paper has reference significance for the optimization of vehicle coasting test methods. References | Related Articles | Metrics

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Optimization Method of FLEX PLI Leg Knee Ligament Spring Adjustment LAI Zhengjian 2022, 48(1): 110-113.  DOI: 10.16638/j.cnki.1671-7988.2023.001.022 Abstract ( )   PDF (1191KB) ( )   In order to study the influence of FLEX PLI leg knee ligament spring compression on FLEX PLI leg knee calibration results, according to the installation process of FLEX PLI leg knee ligament spring, number the ligament spring compression nut, determine the high and low level of ligament spring compression, complete eight corresponding state tests according to the partial factor test design scheme analyzed by Minitab software, and according to the test results, using the optimization responder of Minitab software to optimize the spring compression, the optimal state of FLEX PLI leg knee ligament spring adjustment is obtained. By creating a calculation formula, analyze the difference between the median curve of the upper and lower limits of anterior cruciate ligament (ACL), posterior cruciate ligament (PCL) and medial collateral ligament (MCL) tolerance and the curve of ACL, PCL and MCL of FLEX PLI leg knee calibration results, and select the maximum value to judge the advantages and disadvantages of the calibration results. The results show that the optimized compression of ligament spring can make the calibration test results of FLEX PLI leg knee close to the middle value, that is, the leg shape reaches the best state. In addition, the influence of each row of ligament springs on the calibration judgment values ACL, PCL and MCL is also different. References | Related Articles | Metrics

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Analysis on Lightweight of a Door Based on Finite Element Simulation WANG Xiang 2022, 48(1): 114-118.  DOI: 10.16638/j.cnki.1671-7988.2023.001.023 Abstract ( )   PDF (2257KB) ( )   HyperWorks is used to carry out finite element simulation analysis of vertical stiffness and static strength of a certain commercial vehicle door under the condition of free mode and 1 000 N vertical downward force loading. According to the analysis results, it is determined that there is space for lightweight, based on which two lightweight schemes are designed. The simulation results of free mode, vertical stiffness and static strength of the doors of the two schemes show that the performance of the door of the lightweight scheme 1 meets the requirements of the oEMS and has a good lightweight effect. In scheme 2, the static stress of the inner plate of the door under the loading vertical force exceeds the yield strength of the material, which cannot meet customer requirements. Relevant research can provide customers with reference for door optimization design based on Masteel materials. References | Related Articles | Metrics

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Implementation Method of Physical Verification of Automobile Dimension LU Jianfeng 2022, 48(1): 119-122.  DOI: 10.16638/j.cnki.1671-7988.2023.001.024 Abstract ( )   PDF (2258KB) ( )   Automobile dimension engineering is usually divided into early dimension design and later dimension matching. In order to verify the rationality of early dimension design, automobile dimension physical verification is an indispensable link. This paper introduces the basic concept of vehicle dimension physical verification, mainly from the two aspects of product verification and process verification, explains the main contents of automobile dimension physical verification and the function and necessity of relevant verification, and introduces the implementation method of physical verification combined with specific verification items, so as to make an overall description of automobile dimension physical verification, it has guiding significance for the dimensional physical verification in the new automobile development stage. References | Related Articles | Metrics

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Optimal Design of Traction Seat Outrigger REN Wentao 2022, 48(1): 123-126.  DOI: 10.16638/j.cnki.1671-7988.2023.001.025 Abstract ( )   PDF (1463KB) ( )   In recent years, the demand for semi-trailer tractors has been increasing. In particular, in the first half of 2021, semi-trailer tractors have accounted for half of china's road transport volume, and are gradually attracting the attention and attention of major engine manufacturers. As an important connecting device between semi-trailer and trailer, the reliability of tractor will directly affect the driving safety of semi-trailer. In this paper, taking the traction pedestal leg as an example, CATIA software is used to replace the material and optimize the structure of the traction pedestal leg, and HyperMesh finite element software is used to establish the finite element model of the traction pedestal leg and the corrugated mounting plate. By adding the corresponding boundary conditions, the static analysis results of the two traction pedestal leg schemes are compared. The results show that the safety factor is improved and meets the design requirements. This design not only ensures the transportation efficiency and reliability requirements, but also plays a lightweight effect. References | Related Articles | Metrics

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Virtual Test Method of Light Truck Engine Cooling System HUANG Xin 2022, 48(1): 127-131.  DOI: 10.16638/j.cnki.1671-7988.2023.001.026 Abstract ( )   PDF (1393KB) ( )   Test and simulation are two methods in the development process of engine cooling system. Both have their own advantages and disadvantages in the performance evaluation. This paper proposes a virtual test method combing simulation and preliminary test results to replace the actual test. The results show that，compared with model established by the normal simulation method, the deviation between simulation and test is reduced form 8%～11% to less than 2% in the performance evaluation of cooling system under specific working conditions. References | Related Articles | Metrics

Process and Equipment

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Assembly Deviation Analysis of Vehicle Body and Power Battery YU Yang 2022, 48(1): 132-135.  DOI: 10.16638/j.cnki.1671-7988.2023.001.027 Abstract ( )   PDF (1478KB) ( )   In order to improve the assembly accuracy between the power battery assembly and the vehicle body, the paper takes the size deviation of the power battery mounting hole on the body of the new energy car as the analysis goal. The local installation datum is established and the error accumulation at different levels of welding by using the two-dimensional dimension chain is analyzed. The design idea of the Geometry Dimensioning & Tolerancing (GD&T) of the battery mounting hole is introduced in detail, verified with the help of the three-dimensional deviation analysis software 3DCS, the installation accuracy of new energy vehicle battery is ensured. Besides, the risk of on-site assembly is reduced and the assembly efficiency is improved. It has accumulated experience for the geometric tolerance design of key hole locations in the drawing stage of subsequent projects. References | Related Articles | Metrics

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Automotive Synchronizer Hub Key Groove Symmetry Detection Device XIE Xiaohui 2022, 48(1): 136-139.  DOI: 10.16638/j.cnki.1671-7988.2023.001.028 Abstract ( )   PDF (1444KB) ( )   In the actual production, the existing detection methods, such as vernier caliper and three coordinates, have the disadvantages of large detection error, or low detection efficiency. In view of these detection shortcomings, through the technical requirements of the symmetry, the structural characteristics of the spline outside the involute and the actual processing error of the slide groove are analyzed, and a special measuring device that can quickly and accurately measure the symmetry of the groove of the automobile synchronizer is designed. After the field use verification, the inspection tool is reasonable design, small structure, simple and practical, and can achieve the measurement accuracy of 0.001 mm, which solves the accurate measurement problem of the symmetry of the synchronous tooth hub slide groove in the production. References | Related Articles | Metrics

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Fault Diagnosis and Maintenance of Automobile Electrical Appliances FANG Xiaonan 2022, 48(1): 140-144.  DOI: 10.16638/j.cnki.1671-7988.2023.001.029 Abstract ( )   PDF (2333KB) ( )   In order to improve the electrical fault diagnosis ability of automobile maintenance personnel, this paper takes two types of typical faults of GAC Trumpchi models as examples,and introduces in detail the analytical ideas, fault causes and maintenance process of the airbag fault indicator light and the horizontal adjustment failure of the right rearview mirror. Finally, it is hoped that the maintenance cases can provide experience reference and Enlightenment for the maintenance personnel in the industry References | Related Articles | Metrics

Automobile Education

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Design of Virtual Simulation Experiment Platform for Injection Molding Process Based on Web ZHU Xuerui 2022, 48(1): 145-148.  DOI: 10.16638/j.cnki.1671-7988.2023.001.030 Abstract ( )   PDF (2106KB) ( )   In order to improve the experimental teaching effect of polymer injection molding process, a web-based virtual simulation experiment platform for injection process is designed and developed. It is based on the cloud concept, using the browser as the platform, the code as the tool, and using internet technology. The development process is as follows: first make various kinds of experimental materials such as videos, animations, documents, etc., then use a code compiler to write control command codes, and finally render through the browser to complete the preliminary design of the web site. The virtual platform includes three elements: material, process and equipment (mold), integrates and optimizes multimedia resources such as documents, videos and animation, and provides teaching management services and simple human-computer interaction. After debugging,modification and using, the feedback from teachers and students is better, which effectively promotes the teaching reform. References | Related Articles | Metrics

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Research and Practice on the Reform of Talent Cultivation Program in Application-oriented Institutions —Take the Vehicle Engineering Major of Shanxi Institute of Energy as an Example KANG Xiaoping 2022, 48(1): 149-152.  DOI: 10.16638/j.cnki.1671-7988.2023.001.031 Abstract ( )   PDF (1062KB) ( )   Local application-oriented institutions cultivate and provide qualified applied technical talents to regional enterprises. The talent training program should be optimized and reformed with the development of enterprises to meet the development needs of enterprises. Taking the vehicle engineering major of Shanxi Institute of Energy as an example, through the demand survey of regional automobile enterprises, this paper carries out the works of professional positioning and training goal optimization, professional characteristics construction, curriculum system and practice system reform, and achieves certain results, which provides reference for the reform of talent training program in application-oriented institutions. References | Related Articles | Metrics

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The Exploration and Practice of Modern Apprenticeship in Automobile Major in Higher Vocational Colleges —A Case Study of Henan Polytechnic Institute ZHAO Haijuan 2022, 48(1): 153-157.  DOI: 10.16638/j.cnki.1671-7988.2023.001.032 Abstract ( )   PDF (1004KB) ( )   In order to deepen the integration of vocational education with industry, cooperation between school and enterprise of the automobile classs pecialized, our school, Henan polytechnic institute, has carried on the modern apprenticeship exploration and practice, around the "one center", the "dual education" and establish "three subjects", realize the "four integration", and "five to implement", implement the "six" together. To achieve system innovation, mechanism innovation, model innovation, we explore a set of effective modern apprenticeship training mode. It has passed acceptance inspection as the first batch of modern apprenticeship pilot project of the national. It has important reference significance to promote the three education reform. References | Related Articles | Metrics

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Research and Practice on Teaching Innovation Team Construction of Teachers in Higher Vocational Colleges GONG Yingwei 2022, 48(1): 158-163.  DOI: 10.16638/j.cnki.1671-7988.2023.001.033 Abstract ( )   PDF (1504KB) ( )   The construction of teachers' teaching innovation team is an important measure to improve the level of teachers in vocational education under the background of national vocational educational reform. In order to break the dilemma of teachers' teaching innovation team construction in higher vocational colleges, this paper takes the teaching innovation team construction of new energy vehicle major teachers as an example to sort out the construction target positioning, construction planning and construction path. Based on one goal, relying on two platforms, carrying out three adherence, and implementing four docking, it has provided the implementation path of 16 tasks of five major projects. Adopting 12345 modular task-driven construction mode to build a national teacher teaching innovation team with demonstration and leading roles in the field of new energy vehicle technology is an effective countermeasure to complete the task of innovation team construction with high quality. References | Related Articles | Metrics

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Implementation and Exploration of "1+X" Certificate System in Automobile Field of Higher Vocational Colleges WANG Yurui 2022, 48(1): 164-167.  DOI: 10.16638/j.cnki.1671-7988.2023.001.034 Abstract ( )   PDF (1101KB) ( )   In 2019, the State Council issued the implementation plan of national vocational education reform, proposing the "1+X" certificate system of "academic certificate + several vocational skill certificates". In June 2019, Shanxi mechanical and electrical vocational and technical college applied for and became one of the first batch of "1+X" certificate system pilot colleges in the automotive field. In view of how colleges and universities can implement the "1+X" system and promote the education reform of vocational colleges, our college has carried out exploration, Based on the construction experience of the "1+X" certificate system in the automotive field of Shanxi electromechanical vocational and technical college in the past three years, this paper analyzes the implementation background, implementation process, achievement promotion and other aspects, and puts forward summary and reflection. References | Related Articles | Metrics

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Exploration of Ideological and Political Education in the Course of Check and Repair of Electronic Control System of Automobile Engine CHAI Bin 2022, 48(1): 168-172.  DOI: 10.16638/j.cnki.1671-7988.2023.001.035 Abstract ( )   PDF (1059KB) ( )   Establish morality and cultivate people is the main melody in the teaching process of colleges and universities nowadays, and it is also the main channel for colleges to explore teaching reform, this paper mainly introduces the concrete implementation plan and practice of establishing a moral person in the course of check and repair of electronic control system of automobile engine. According to the knowledge connotation of the course check and repair of electronic control system of automobile engine, we choose the ideological and political points of the course pertinently, make them complement each other, fully arouse the students’study enthusiasm, and explore an effective teaching method, good results is achieved. References | Related Articles | Metrics

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Optimization Analysis of Bus Routes Based on Passenger Demand JIN Hui 2022, 48(1): 173-176.  DOI: 10.16638/j.cnki.1671-7988.2023.001.036 Abstract ( )   PDF (1162KB) ( )   With the continuous improvement of China's economic development level, the pressure of transportation in various cities is rising. It is a priority to develop the urban public transport system and study the optimization of the bus routes. In this study, based on the data of existing bus lines and stations in qilihe district, lanzhou city, a bus line optimization model is established, aiming to reduce the travel time and the transfer times of passengers. The restrictions of route length, route non-linear coefficient, route repetition coefficient, transfer coefficient and station distance are selected as constraints. According to the final research results, the optimization measures for the existing bus lines and stations in qilihe district of lanzhou city are put forward. The suggestions are to extend 10 short routes and remove the bus stations with small spacing. References | Related Articles | Metrics

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Overview and Prospect of CCC Certification of Automotive Products in China ZHENG Yuyu 2022, 48(1): 177-181.  DOI: 10.16638/j.cnki.1671-7988.2023.001.037 Abstract ( )   PDF (1287KB) ( )   This paper briefly describes the establishment background and development process of china compulsory certification (CCC) system, points out the responsibilities of the competent departments, technical expert groups, designated certification institutions and laboratories, CCC inspectors and certification clients of CCC certification, and briefly describes the automobile CCC certification procedures. Put forward suggestions on the application of new automotive products and technologies in CCC certification under new business formats, strengthen the promotion of CCC certification on new management requirements, standards and regulations in automobile electrification under the goal of "carbon peak and carbon neutralization", build the application of big data for automobile CCC certification, improve the certification, and continue to strengthen the dynamic adjustment mechanism of automobile CCC certification directory at the same time, objective to promote automobile CCC certification, help the high-quality development of China's automobile products and enhance the competitiveness of automobile products on the premise of ensuring the bottom line of product safety. References | Related Articles | Metrics

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Analysis of Intelligent Cockpit Multi-modal Interaction Technology Development Status and Trend LIU Yao 2022, 48(1): 182-187.  DOI: 10.16638/j.cnki.1671-7988.2023.001.038 Abstract ( )   PDF (1408KB) ( )   In the development history of the world's automobile for more than 100 years, it has experienced the evolution from mechanization, electronization to intelligent informatization. In today's intelligent and information age, the experience brought by the car cabin to the user has become one of the most important bases for the user to choose the car brand. After the combination of traditional cockpit and intelligent technology, the concept of intelligent cockpit is proposed. Based on the main differences between intelligent cockpit and conventional car cockpit, this paper proposes the core technology of intelligent cockpit human-computer interaction. In the future, it will be a long and complex process for the intelligent cockpit to transform from voice interaction to multimodal combined interaction. This paper analyzes the application status and trend of information recognition technology involved in multimodal interaction technology. Compared with the current mainstream voice interaction technology, it can be found that the expression efficiency of multimodal interaction technology has significantly improved and the amount of information expressed has significantly increased. Finally, based on the above analysis, five development suggestions are proposed, For example, continuously improve the standardization work and create a good business environment. References | Related Articles | Metrics

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Talking about the Common Failure Modes and Mechanism of Wheel Hub Bearing LI Zhenlin 2022, 48(1): 188-190.  DOI: 10.16638/j.cnki.1671-7988.2023.001.039 Abstract ( )   PDF (1486KB) ( )   The bearing for automobile wheels is composed of two sets of conical roller bearings. Its main role is to bear weight and provide accurate guidance for the rotation of the hub. It bears both axial load and radial load, which is a very important component. Once the bearing fails, the whole vehicle will shake and vibrate, and it is also easy to produce a large noise, which will have a direct impact on the driving safety. Therefore, the bearing failure mode and failure mechanism are analyzed, and effective solutions are put forward from the perspective of failure prevention and treatment, aiming to improve the treatment effect of the common failure problems of hub bearings. References | Related Articles | Metrics