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23 May 2024, Volume 49 Issue 10 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
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New Energy Vehicle

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Design and Research on Automatic Hill-hold Function for Battery Electric Vehicles DENG Jianming 2024, 49(10): 1-5,26.  DOI: 10.16638/j.cnki.1671-7988.2024.010.001 Abstract ( )   PDF (454KB) ( )   This paper investigates a method for implementing automatic hill-hold functionality in batterry electric vehicles using an electro-hydraulic braking (EHB) system. The approach leverages the existing slope sensor and EHB electronic brake assist system in battery electric vehicles to achieve automatic auxiliary parking assistance. In contrast to the conventional method of relying on the electric motor's immobilization, which carries the risk of motor fatigue and durability issues, this method achieves nearly 1 h of auxiliary hill-hold functionality without the need for electronic parking brake (EPB) hardware, thus reducing system costs and complexity. Through analysis of experimental data and charts, this paper evaluates the stability and adaptability of the automatic hill-hold function under different slopes and road conditions, as well as the response time and dynamic performance when the driver presses the accelerator pedal. The results showcase the performance advantages and effectiveness of this method. This technology contributes to enhancing driving safety and comfort, providing technical support for the intelligent development of battery electric vehicles. References | Related Articles | Metrics

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Research on the Relationship between Oil Volume and Efficiency in High-Speed Electric Drive Systems YUAN Zhongmou 2024, 49(10): 6-9.  DOI: 10.16638/j.cnki.1671-7988.2024.010.002 Abstract ( )   PDF (1252KB) ( )   2.Hunan Province Key Laboratory of New Energy Power and Drive Systems drive systems, and confirming the consistency between theoretical analysis and practical application. An optimization strategy based on actual operating conditions is proposed in this paper, offering theoretical guidance for the optimization design of electric drive systems and methodological reference for practical operations. This has a significant impact on advancing the development of technologies related to new energy vehicles. References | Related Articles | Metrics

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Research on Cooling Performance of Drive Motor Parallel Runners CHEN Hui 2024, 49(10): 10-15.  DOI: 10.16638/j.cnki.1671-7988.2024.010.003 Abstract ( )   PDF (2744KB) ( )   The design of cooling runners has an important impact on the cooling performance of the motor, in order to study the cooling performance of parallel runners,the paper takes 135 kW permanent magnet synchronous motor as the research object, using the computational fluid dynamics (CFD) simulation method to analyze the impact of the number of parallel runners on the cooling performance of the motor, and comparing the differences in the cooling performance of the parallel runners and tandem runners, the results show that the number of circumferential parallel flow channels has obvious influence on the temperature field and velocity field of the motor shell. With the decrease of the number of flow channels, the maximum temperature of the inner wall of the shell decreases, the average flow velocity and velocity uniformity coefficient of the flow channel increase, and the inlet and outlet pressure of the flow channel increases, but the change range is small. Compared with the circumferential Z-series flow path, the inner wall temperature of the motor shell rises higher, but the temperature distribution is uniform. The average velocity is gentle and the coefficient of velocity uniformity is higher. The difference between import and export pressure is even lower, reduced by nearly five times. References | Related Articles | Metrics

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Optimisation Design of External Rotor Permanent Magnet Synchronous Motor Based on Fast Efficiency MAP DIAO Xingpeng 2024, 49(10): 16-22.  DOI: 10.16638/j.cnki.1671-7988.2024.010.004 Abstract ( )   PDF (1037KB) ( )   The ever-changing operating conditions of electric vehicles require a wide speed-torque range and high efficiency range for the drive motor, and the motor efficiency MAP is the most intuitive tool to evaluate whether the drive motor satisfies the above requirements. However, the motor efficiency MAP usually requires bench testing to obtain, which wastes time and energy, and cannot satisfy the requirements of rapid verification and optimisation iteration in the current agile development process of electric vehicles. To address this problem, this paper calculates the electromagnetic parameters of the external rotor permanent magnet synchronous motor used in in-wheel motors using the equivalent magnetic circuit method. Then, the motor control strategy is introduced to calculate the losses in the entire speed torque range of the motor. Finally, the fast calculation of the efficiency MAP is programmed in MATLAB. Based on the method proposed in this paper and combined with genetic algorithm, the optimisation design of motor structural parameters can be achieved, thereby improving motor development process. References | Related Articles | Metrics

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Analyze of the Influencing Factors of the Drag Torque of the Two-speed Reducer YAO Bijun 2024, 49(10): 23-26.  DOI: 10.16638/j.cnki.1671-7988.2024.010.005 Abstract ( )   PDF (803KB) ( )   In this paper, in order to explore the influence of multiple factors on the drag torque of the two-speed reducer, the influence of a two-speed reducer and oil product of an electric drive on the overall drag torque is explored by controlling the single factor one by one. Specifically, the oil quantity, oil temperature and structural resistance factors are analyzed and studied through experiments, and their influence on the drag moment is obtained. The test results show that the low speed is mainly the frictional resistance torque of the system structure parts. The high speed is mainly affected by the amount of oil, that is, the influence of the oil stirring resistance. And the temperature has a great influence on the oil stirring resistance, so as to ensure the appropriate oil temperature and greatly reduce the drag torque. This paper provides a direction for optimizing the resistance moment. References | Related Articles | Metrics

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The Influence of Booster Module on the Design of Hybrid Electric Drive System TAN Libo 2024, 49(10): 27-32.  DOI: 10.16638/j.cnki.1671-7988.2024.010.006 Abstract ( )   PDF (1977KB) ( )   As the user's pursuit of strong power and low fuel consumption of hybrid electric vehicles under different working conditions is getting higher and higher, the booster module is equipped, which is bidirectional direct current to direct current (DC/DC) converters become can meet the user's requirements. This paper mainly aims at the design changes of four dimensions of motor, electronic control, speed ratio matching and strategy optimization after the booster module is applied to the hybrid electric vehicle, and analyzes the design logic of the hybrid electric driving force system and describes the technical difficulties that may be encountered in the application of each subsystem after the booster module is added. Some design considerations are put forward for improving power performance and fuel consumption of hybrid electric vehicles by using booster module. References | Related Articles | Metrics

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Research on GPT Driven New Energy Vehicle Fault Diagnosis and Solution Generation LUO Feng 2024, 49(10): 33-38.  DOI: 10.16638/j.cnki.1671-7988.2024.010.007 Abstract ( )   PDF (812KB) ( )   With the increasing popularity rate of new energy vehicles in China year by year, the failure rate is also on the rise. In order to ensure the safe and reliable operation of new energy vehicles, this study aims to explore a method of rapid and accurate diagnosis and solution provision based on fault information. In this study, a natural language processing method based on the generative pre-trained transformer model (GPT) is adopted to realize the end-to-end automated processing process from fault information to solution by making full use of its powerful language model. In the experimental process of this study, we constructed two rich corpora to extract relevant information from users' natural language descriptions and scientific papers respectively to fully support the training and testing requirements of the model. Based on the pre-trained model of GPT, this study fine-tuned the model to improve its adaptability and performance. In order to evaluate the generation effect of the model objectively and comprehensively, two evaluation indexes BLEU and ROUGE are used in this study. At the same time, we also conduct a subjective and detailed analysis of the generated solution to demonstrate the advantages and practical effectiveness of the model. According to the analysis of experimental results, the model proposed in this study shows a higher level of semantic consistency, completeness and accuracy when generating solutions, which has significant advantages over the comparison model. References | Related Articles | Metrics

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Vehicle Auto Anti-fog Control Strategy with Feedforward and Feedback Factors YU Shuliang 2024, 49(10): 39-43.  DOI: 10.16638/j.cnki.1671-7988.2024.010.008 Abstract ( )   PDF (1096KB) ( )   Auto anti-fog is important to new energy vehicle in driving safe and energy consumption. The purpose of this paper is to provide an anti-fog strategy considering both feedforward and feedback factors, that can improve vehicle comfortable and energy conservation. Based on the principle of vehicle fogging and defogging, calculate fog risk including feedforward and feedback factors. On one side calculate the glass temperature and dew point temperature as feedback factors, on the other side calculate feedforward factors fog risk such as solar, tunnel, windshield heat transfer, rain, number of passenger and cold start to ensure no fog risk. By building Simulink model and generating code to write strategy into software. After calibration and test, when fog risk is low, use less proportion of fresh inlet air, else increase fresh inlet air, change to defog and dehumidification mode. Thus, the system energy saving, passenger cabin comfort and driving safety are taken into account to the greatest extent. References | Related Articles | Metrics

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Research on Charge and Discharge Energy Losses of Hybrid Electric Vehicle Power Battery CHEN Hao 2024, 49(10): 44-47,79.  DOI: 10.16638/j.cnki.1671-7988.2024.010.009 Abstract ( )   PDF (1169KB) ( )   The power battery charge and discharge losses of hybrid electric vehicles directly affect the vehicle's energy efficiency and performance. This paper establishes an internal resistance model of the power battery and a battery state-of-charge estimation model to study the effects of different charge and discharge rates on battery losses, load energy, and overall efficiency of hybrid electric vehicles at different states of charge. Simulation results indicate that the power battery exhibits higher efficiency at low discharge rates. Full charging of the power battery is detrimental to battery health and energy losses, but full charging of the power battery has the highest energy conversion efficiency. The simulation results provide a theoretical basis for achieving efficient and healthy operation of power batteries under different states of charge. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Sensor Safety Mechanism Design of Electric-hydraulic Steering System ZHANG Baoyi 2024, 49(10): 48-53.  DOI: 10.16638/j.cnki.1671-7988.2024.010.010 Abstract ( )   PDF (2618KB) ( )   With the improvement of commercial vehicle autonomous driving level, the safety of the active steering function of the steering system is increasingly valued. The electric-hydraulic steering system is currently an ideal solution for the steering electrification and intelligence of medium and heavy commercial vehicle. This paper proposes a high safety electric-hydraulic steering system with an electrical redundancy architecture, and designs the most critical sensor safety mechanism from the perspective of functional safety. Precisely, redundancy verification and online monitoring of failure modes are carried out on the torque signal, and the absolute angle values converted by the steering wheel by the two angle acquisition modules and motor position sensors are analyzed for correctness verification and multiple fault tolerance judgments. Finally, the hardware-in-the-loop(HIL) test is carried out to verify the effectiveness of the designed sensor safety mechanism. References | Related Articles | Metrics

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Research on Backlash Compensation Control of Steering System for Autonomous Semi-Trailer Vehicles ZHANG Zhida 2024, 49(10): 54-61.  DOI: 10.16638/j.cnki.1671-7988.2024.010.011 Abstract ( )   PDF (1306KB) ( )   In order to ensure the effectiveness of trajectory tracking control for autonomous semi-trailer vehicles, a control method considering steering system backlash compensation is proposed. A trajectory tracking model based on a three degree of freedom vehicle dynamics model is established, and an linear quadratic regulator (LQR) based trajectory tracking controller is designed on this basis. A steering system backlash model considering the differences between the left and right sides is established, and a backlash model parameter identification method based on recursive least square method is designed. A steering backlash inverse model is established using the identified parameters to compensate for the output of the trajectory tracking controller. The parameter identification method of the backlash model is validated using real vehicle data and simulation data, and the backlash compensation control is validated based on the TruckSim-Simulink joint simulation platform. The results show that the designed identification method can quickly identify the steering transmission ratio and backlash on both sides of the steering system model, and the accuracy and stability of trajectory tracking control considering backlash compensation are significantly improved. References | Related Articles | Metrics

Design and Research

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Research on Starting Control of AMT Vehicle on Low Adhesion Road Surface LI Xuan 2024, 49(10): 62-65.  DOI: 10.16638/j.cnki.1671-7988.2024.010.012 Abstract ( )   PDF (979KB) ( )   Aiming at the problem of driving wheel slip of automated mechanical transmission (AMT) vehicles starting on low adhesion road surface, taking the vehicle equipped with 6 AMT light truck as the research object, judging the skid of driving wheel on low adhesion road surface according to AMT system and anti-lock brake system (ABS) wheel speed, and conducting dynamic analysis of vehicle starting on low adhesion road surface. The starting control strategy of AMT vehicles with low adhesion road surface is proposed, corresponding control software is designed, and the real vehicle test is verified on the low adhesion road surface. The test results show that the research method can well meet the requirements of AMT vehicles with low adhesion road surface starting, effectively avoid driving wheel skid, improve vehicle handling stability, and have strong practicability. References | Related Articles | Metrics

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Lightweight Structure Design of a New Energy Truck QIN Jingjing 2024, 49(10): 66-70.  DOI: 10.16638/j.cnki.1671-7988.2024.010.013 Abstract ( )   PDF (2299KB) ( )   New energy vehicle weight loss of 100 kg, range will increase 10%～11%, while reducing 20% of the cost of battery and daily wear-and-tear costs, so it is particularly important for the vehicle weight loss design. This paper takes the new energy van compartment as the research object, it uses CATIA to design the cargo compartment model and conducts computer aidied engineering (CAE) analysis on the built digital model to obtain the strength and mode performance. The optimization is carried out from the angle of reducing the bone reinforcement of the cargo compartment roof and changing the material. Through ANSYS analysis, the weight loss ratio of material optimization scheme is 36% and the weight reduction ratio of the structure optimization scheme is 11%. Therefore, the optimal lightweight scheme is the material lightweight scheme. References | Related Articles | Metrics

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Analysis and Optimization of Single Trailing Arm Rear Suspension of Light Coach Based on ADAMS HU Bin 2024, 49(10): 71-74.  DOI: 10.16638/j.cnki.1671-7988.2024.010.014 Abstract ( )   PDF (1340KB) ( )   This paper mainly studies the effect of triangular arm arrangement hard point of single trailing arm suspension on bump toe and bump camber of vehicle. Firstly, taking a single trailing arm suspension as the research object, the multi-body dynamics model is established by ADAMS/Car and the simulation analysis is conducted to find out the existing problems. Then, the sensitivity analysis of the main hard point coordinates is used in ADAMS/Insight to find the key factors affecting the changes of the toe and camber, and according to the key factors to optimize the design of the research object, so that the performance of the bump toe and bump camber character is improved. Finally, the layout points and optimization ideas of single trailing arm suspension are summarized, which provides a reference for the hard point design of single trailing arm. References | Related Articles | Metrics

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Analysis and Optimization Verification of the Bolt Slip on Bearing Support for a Transmission LI Jinwei 2024, 49(10): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2024.010.015 Abstract ( )   PDF (2143KB) ( )   Aiming at the gear whine issue in the road test of a model continuously variable transmission (CVT), it is found that the gear whine issue is caused by the misalignment of pinion shaft system that from excessive bolt slip on bearing support through noise Colormap diagram and contact spot test. The sliding amount and position of bolt connection between shell and bearing support are predicted by finite element, the maximum sliding amount of bolt in the original scheme is 0.39 mm, which is far exceeds the design target value. Therefore, the scheme of seamless pin and increasing the roughness of contact surface is put forward to decrease the slip of bolt. The optimized results show that the slip of bolt is reduced to 0.09 mm, and the non-slip performance is improved by about 76.9%. After further end of line (EOL) test and road test , the gear whine issue is solved. References | Related Articles | Metrics

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Failure Analysis and Scheme Optimization of Fixing Bolts for Heavy Truck Frames LI Peng, WANG Lei 2024, 49(10): 80-83.  DOI: 10.16638/j.cnki.1671-7988.2024.010.016 Abstract ( )   PDF (3987KB) ( )   The failure problem of bolted connection is the focus of the automobile industry. Based on the bolt breakage problem of a heavy off-road vehicle in the test process, this paper firstly selects fasteners according to the automobile standard parts manual, and then makes a macroscopic observation of the broken bolts, finds the origin area of the fracture, and then carries out physical and chemical analysis and computer aided engineering (CAE) analysis of the fracture bolts. Through the in- depth analysis of the failure causes, the failure causes are found, and the preventive measures are put forward, which provides a feasible idea for solving the fixed bolt fracture. References | Related Articles | Metrics

Testing and Experiment

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Modal Characterization Analysis of Mistuned Turbine Blades CAO Tijun 2024, 49(10): 84-87.  DOI: 10.16638/j.cnki.1671-7988.2024.010.017 Abstract ( )   PDF (2047KB) ( )   In order to solve the vibration problem caused by the detuning of the turbine blades of the turbocharger, the substructure model of the turbine blades is established, the modal analysis is carried out, the Campbell diagram is drawn, and the natural frequencies and mode shapes of the mistuned blades with different standard deviations are measured. The results show that when the blade is mistuned, it is periodically destroyed, and one or several blades vibrate abnormally, showing the phenomenon of vibration localization. Therefore, it is necessary to avoid damage to the turbine blades caused by stress concentrations and prevent the failure of the turbocharger during the design. The relationship between the random mistuning of blades and the resonance characteristics of blisk structure is the key to study the vibration characteristics of blades, and this link can ensure stable operation and improve performance, it is of great significance for the study of blade mistuning. References | Related Articles | Metrics

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Analysis of the Effect of Soft Headrest on Whiplash Damage of a Certain Seat ZHANG Aifa 2024, 49(10): 88-91,119.  DOI: 10.16638/j.cnki.1671-7988.2024.010.018 Abstract ( )   PDF (1937KB) ( )   Wearing a soft headrest can change the seat's protective effect in a rear-end collision, but little research has been done on whiplash performance when wearing a soft headrest. In order to explore the role of soft headrest in rear-end collision accident, a comparative whiplash experiment is designed and completed about two conditions of wearing soft headrest and not wearing soft headrest. The results show that the soft headrest can make the dummy's head touch the seat earlier, support and buffer the head movement of the dummy, slow down the violent degree of the head swing backward, and reduce the damage of all parts of the dummy, the peak value of neck injury is significantly reduced, and the whiplash score is improved. As a kind of pre-research data accumulation of rear-end accident, the research results will serve for the revision of the whiplash regulations. References | Related Articles | Metrics

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Consistency Analysis of Two Methods of 3D Scanning and Checking Fixture Detection of Automotive Glass ZHANG Longgang 2024, 49(10): 92-95.  DOI: 10.16638/j.cnki.1671-7988.2024.010.019 Abstract ( )   PDF (2322KB) ( )   At present, the industry mainly uses checking fixture to inspect the dimensions of automotive glass. However, with the development of new technology, the method of 3D scanning has also been gradually applied to detect the glass profile. There are certain differences in the measurement data of these two methods, which are difficult to be put together for direct comparison, and such data differences may also cause disputes on quality analyses. This paper takes a side window glass as the experimental object, and carries out a comparative analysis of the two methods of 3D scanning and checking fixture detection from the measurement principle to the data, which proves that the two detection methods are consistent in the evaluation of the glass surface fit. References | Related Articles | Metrics

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High Speed Vibration Analysis and Control of the Electric Truck YIN Jinxiang 2024, 49(10): 96-98.  DOI: 10.16638/j.cnki.1671-7988.2024.010.020 Abstract ( )   PDF (1171KB) ( )   To solve the problem of high speed vibration of the electric truck, the mechanism and transmission path of the high-speed vibration are introduced. At the same time, investigations from the excitation source to the transmission path and response point are proposed. The results from analysis is that the cause of the vibration problem is the vibration of the front spring system caused by the excitation of the tire, which resonated with the frame, than cause forced vibration in the cab. The solutions are proposed that to reduce the vibration of the excitation source, the dynamic balance, end jump, and radial jump of the tire are needed to improve, to avoid the resonation, the stiffness of the tire is needed to increase. From the test results, the effect is obvious, which has significance for the solution of engineering problems. References | Related Articles | Metrics

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Research on Performance Improvement of Gear Switch in High and Low Temperature Environment ZHAO Lin 2024, 49(10): 99-102.  DOI: 10.16638/j.cnki.1671-7988.2024.010.021 Abstract ( )   PDF (1301KB) ( )   The gear switch is one of the import electrical components on the transmission, and its output signal indicates whether the transmission is hanging into the corresponding gear, which avoids a protective device that makes the vehicle rush forward when the gear is already in gear. The working reliability of the gear switch directly affects the driver's driving experience. Aiming at the problem that the gear switch used in heavy truck, by improving the temperature resistance grade of the engineering plastic parts inside the switch, optimizing the high and low temperature performance of the rubber parts and adjusting the internal strucure of the switch, make the gear switch meet the use requirements of the gearbox under complex environmental conditions. References | Related Articles | Metrics

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Experimental Study on Dynamic Impact Properties of the WorldSID 50th Dummy Arm QIU Yuhang 2024, 49(10): 103-107.  DOI: 10.16638/j.cnki.1671-7988.2024.010.022 Abstract ( )   PDF (2393KB) ( )   In order to investigate the dynamic impact mechanical properties of the WorldSID 50th dummy arm, based on the dynamic impact response curve of the WorldSID dummy arm in the vehicle crash test, a dynamic impact test device for the dummy arm is constructed, and several dynamic impact tests are conducted. The effects of arm joint tightness and arm stiffness on the mechanical properties of the arm are investigated. The results show that under the same impact conditions, the adjustment force value of the arm joint is negatively correlated with the maximum angle of arm rotation along the y-axis, and positively correlated with the peak value of shoulder force Fz . The skin hardness value of the dummy arm is positively correlated with the peak value of shoulder force Fy, and negatively correlated with the maximum angle value of arm bending along the x-axis. References | Related Articles | Metrics

Process·Materials

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Experimental Research on Laser Cutting Process Based on 3 mm Thick Carbon Steel Sheet QIN Tao 2024, 49(10): 108-111.  DOI: 10.16638/j.cnki.1671-7988.2024.010.023 Abstract ( )   PDF (1917KB) ( )   With the rapid development of manufacturing, laser cutting technology, as an advanced processing method, has been widely used in the field of sheet cutting. This article mainly studies the laser cutting process of 3 mm thick carbon steel sheet, and analyzes the influence of process parameters such as cutting speed, auxiliary gas pressure, and focus position on cutting quality through experimental methods. The experimental results show that appropriate cutting speed and auxiliary gas pressure can improve the quality and efficiency of cutting, while optimization of focus position can further improve the quality of cutting section. These findings are of great significance for guiding practical production and improving the process level of laser cutting for thin sheets. References | Related Articles | Metrics

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Analysis and Application of Logistics On-line Mode in Automobile Factory GAO Jianwei 2024, 49(10): 112-115.  DOI: 10.16638/j.cnki.1671-7988.2024.010.024 Abstract ( )   PDF (1540KB) ( )   Personalized demand makes the automobile production process with multi-variety, small batch characteristics, how to use the thousands of parts required by each automobile in an appropriate way efficient, accurate, low-cost organization distribution online, is the focus of each automobile enterprise research.This paper analyzes the application scenarios of different online distribution methods of materials, adopts different distribution methods in combination with the differences in material attributes during the construction of new factories, and proposes certain improvements and optimization of kanban pull and time-slot distribution methods according to the characteristics of the assembly line. The application results show that the improvement measures are more efficient in responding to the changes of the assembly line,and also more in line with the characteristics of lean logistics. References | Related Articles | Metrics

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Analysis on Automotive Though Type Tail Lamp Height Impact Factors ZHOU Peng 2024, 49(10): 116-119.  DOI: 10.16638/j.cnki.1671-7988.2024.010.025 Abstract ( )   PDF (1557KB) ( )   Automotive though type tail lamp design is one of the main stream of automotive design, tail lamp height impacts the styling, tail lamp pocket structure and joint method of tail lamp pocket, which impact the manufacture ability and cost. Based on introduction of automotive though type tail lamp, the main factors affected the height of tail lamp are analyzed. The influences of sheet metal shape design, taillight lighting area design, sheet metal structure design of tailgate and sheet metal jioning process affect the height of though type tail lamp are discussed, and cost impact to vehicle are analyzed. These provides reference for the design of though type tail lamp. References | Related Articles | Metrics

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Analysis of Process Equipment Informatization Construction WEI Zhiqi 2024, 49(10): 120-125,180.  DOI: 10.16638/j.cnki.1671-7988.2024.010.026 Abstract ( )   PDF (2016KB) ( )   Good process equipment is the guarantee of product quality, is one of the company's core competitiveness, through the way of information construction, grasp the state of the whole life cycle of process equipment, improve the collaboration between tooling users, owners and designers, can effectively improve the design ability and management ability of process equipment. This paper summarizes and analyzes the basic requirements of process equipment informatization construction, clarifies the requirements and core contents of tooling informatization construction, and introduces the building methods of data system based on UG platform and product data management (PDM) system platform. References | Related Articles | Metrics

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Body Parts Measurement and Matching State Simulation Based on PloyWorks WANG Qi'ao 2024, 49(10): 126-130.  DOI: 10.16638/j.cnki.1671-7988.2024.010.027 Abstract ( )   PDF (3506KB) ( )   Oems need to improve the control ability of parts size and welding process to reduce production costs. In this paper, the articulated coordinate measuring machine and PolyWorks analysis software are used to measure the dimension of parts and analyze the virtual matching. The size deviation of the matched parts is mastered, and the gap and interference of the lap surface are calculated after the point clouds of several parts are matched according to the design. Combined with the actual welding process and positioning situation, the causes of deformation are found, which provides the basis for the next step of parts improvement and fixture adjustment, so as to solve the actual problems on the site. References | Related Articles | Metrics

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Research Current Status of Bolt Connection and Testing Methods in Body-in-white Production Line LIU Yunzhou 2024, 49(10): 131-136,169.  DOI: 10.16638/j.cnki.1671-7988.2024.010.028 Abstract ( )   PDF (2418KB) ( )   Bolt connection is the most common connection process in the assembly of white body door covers, and the reliability of bolt strength is one of the important guarantees for automotive safety. This article introduces the bolt connection assembly of metric ISO bolts suitable for automobiles and their components, as well as the installation tightening method used within the Volkswagen Group. It focuses on the technical requirements for bolt tightening in an advanced vehicle manufacturing plant, commonly used tightening tools, and differentiated tightening methods for various types of bolts. It also emphasizes the tightening detection technical specifications for bolts and nuts, the storage system storage method for tightening data, and the specific requirements for data storage. Ensure the accuracy of tightening results and the reliability of data, as well as possible quality traceability in the future. Familiarity with the system and mastery of the vehicle bolt tightening control scheme, as well as the optimization of tightening process quality by on-site quality personnel, play an important guiding role. References | Related Articles | Metrics

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Intelligent Measurement Model for the Width of Oxidized Black Belt in Rolling of Automotive Bars Based on Image Processing ZHU Fuwen 2024, 49(10): 137-140.  DOI: 10.16638/j.cnki.1671-7988.2024.010.029 Abstract ( )   PDF (1199KB) ( )   Ear defects are a common type of defect in bar rolling and are difficult to eliminate. In order to achieve intelligent prediction and guide the elimination of ear defects, this article observes that during the rolling process, the part of the bar in contact with air will be oxidized by air, forming a black strip like surface. The narrower the width of the black band, the easier it is to produce ears. However, there is currently almost no research on the automatic measurement of the width of the black belt. In actual production, the measurement of the width of the Huff surface mainly relies on manual visual inspection, which has a high degree of subjective randomness. This article proposes a method based on high-speed cameras to quickly capture images. By recognizing the images, the width of the oxidation black belt on the Huff surface can be intelligently measured, which can provide data support for the optimization of related subsequent process parameters and has important engineering significance for further guiding industrial production. References | Related Articles | Metrics

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Research on the Properties of Modified Recycled Polypropylene Materials for Vehicles DIAO Shuai 2024, 49(10): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2024.010.030 Abstract ( )   PDF (1219KB) ( )   In order to verify the feasibility of recycled polypropylene materials used in automotive recycled parts, the differences of density, tensile properties, bending properties, impact properties, thermal deformation temperature and Vicat softening temperature between modified polypropylene and recycled polypropylenewith different talc content are compared and analyzed. The results show that compared with the original polypropylene, the strength of regenerated polypropylene increased, the toughness decreased, and the resistance to thermal deformation of the material had no significant change. The increase in talc powder content increases the density of the material and its strength, reduces its toughness, and improves the ability of the material to resist thermal deformation. It provides data support for the modification and application of recycled polypropylene. References | Related Articles | Metrics

Automobile Education

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Analysis of Online Practical Training Course Construction Based on "VR+5G" －Taking the New Energy Vehicle Technology Major as an Example QU Yating 2024, 49(10): 145-150.  DOI: 10.16638/j.cnki.1671-7988.2024.010.031 Abstract ( )   PDF (959KB) ( )   Higher vocational education has strong practicality and applicability, and attaches great importance to the construction of various practical training courses. However, the current teaching mode of practical training courses and the lack of teaching experimental equipment seriously affect the development of vocational education. Based on the "three high and three difficult" problems existing in the practical training course of new energy vehicle technology, the paper uses "virtual reality (VR) +5G" technology to promote the teaching of vehicle practical training courses to become intelligent and information. The specific focus is on the innovation of virtual training course teaching methods, operational demonstration skills, and the integration and development of online and offline training courses, aiming to break through the inherent teaching mode, deconstruct and reconstruct the practical training course system, in order to continuously promote practical teaching in the automotive industry and enhance new impetus for cultivating information-based talents. References | Related Articles | Metrics

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The Application of Action-oriented Teaching Method in the Course of Automotive Maintenance and Repair GUO Anbang 2024, 49(10): 151-154.  DOI: 10.16638/j.cnki.1671-7988.2024.010.032 Abstract ( )   PDF (942KB) ( )   Action-oriented teaching method is a new kind of teaching method, which has remarkable effect on cultivating students' practical ability and problem-solving ability. However, in the actual teaching process, there are still many problems in teaching concept, teaching environment, teaching method, teaching design and so on. The article from the understanding of curriculum standards, analysis of curriculum content; clear teaching objectives and choose teaching methods; constructing "double-teacher" structure, optimizing the teaching staff; arousing students' interest and arousing their enthusiasm; attaching importance to preparation before class, improving classroom efficiency; innovating teaching means and improving students' ability. After a series of teaching practices in the later period, the effectiveness of the application of this teaching mode in the teaching of Automotive Maintenance and Repair course is verified. It is hoped that in the later period of teaching, can constantly innovate teaching methods and improve teaching quality. References | Related Articles | Metrics

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Analysis on the Construction of Vocational Automotive Professional Curriculum System Based on 1+X Certificate YAN Chaojie 2024, 49(10): 155-159.  DOI: 10.16638/j.cnki.1671-7988.2024.010.033 Abstract ( )   PDF (1258KB) ( )   The implementation of the 1+X certificate system is of great significance for vocational colleges to deepen the reform of the training mode for composite technical talents and improve the quality of talent cultivation. Through the introduction of 1+X certificate system, some challenges and advantages brought by it are analyzed. With reference to the 1+X professional skill level standard of vocational skill grade certificate, it explores and practices from the aspects of course certificate integration, talent cultivation plan, course system, course content, organizational implementation, etc. Some effective measures and suggestions are proposed to provide experience for the continued promotion of the 1+X certificate system in this major, in order to promote the development of vocational automotive curriculum system. References | Related Articles | Metrics

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A Study on the Education of Automobile Majors in the Second Classroom from the Perspective of "Three Comprehensive Education"－Taking Xi'an Aeronautical Polytechnic Institute as an Example DENG Ruixiang 2024, 49(10): 160-164.  DOI: 10.16638/j.cnki.1671-7988.2024.010.034 Abstract ( )   PDF (1081KB) ( )   The second classroom as a crucial component of the educational system, serves as an indispensable instrument for broadening educational access, fostering innovative pedagogical models, and enhancing the efficacy of teaching and learning. This article presents a comprehensive overview of the contemporary state of second classroom education within higher learning institutions, with a specific focus on the current practice of automotive majors in vocational colleges. Furthermore, the study explores a localized strategy of implementing "three comprehensive education" within second classrooms. This strategy includes the creation of an automotive culture environment, the establishment of labor education bases, the innovation of school-enterprise cooperation models, and the improvement of skill competition platforms. The end goal is to establish a comprehensive education model that integrates cultural education, labor education, collaborative education, and skill education. The research findings serve as a valuable reference for educators and administrators in vocational colleges who are responsible for overseeing the second classroom education of automotive majors. References | Related Articles | Metrics

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Exploration and Implementation of Curriculum Ideological and Political Elements of Automobile Theory Based on Online and Offline Blended Instruction Mode LI Man 2024, 49(10): 165-169.  DOI: 10.16638/j.cnki.1671-7988.2024.010.035 Abstract ( )   PDF (1367KB) ( )   By integrating the unique aspects of the profession and curriculum characteristics, an exploration and implementation of curriculum ideological and political elements in the Automotive Theory is conducted based on online and offline blended instruction model. The use of the Superstar Learning online platform, along with offline classroom instruction, led to the innovation of instruction methods and the establishment of blended instruction model. Delving into both professional knowledge points and teaching activities, ideological and political elements at personal, social, and national levels are extracted and organically integrated into curriculum objectives,classroom Instruction activities, and curriculum assessments, aiming to simultaneously cultivate ideological and political skills. The implementation results indicated that incorporating curriculum ideological and political elements into the Automotive Theory under the blended instruction model not only effectively enhanced students' knowledge and skills, but also firm positive ideals and beliefs, establish scientific perspectives on life and values, foster a rigorous professional outlook, and encourage a commitment to social responsibility and contributing to technological development. References | Related Articles | Metrics

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Analysis of the Influencing Factors of Carbon Emissions from Urban Transportation GONG Juezhuoma 2024, 49(10): 170-174.  DOI: 10.16638/j.cnki.1671-7988.2024.010.036 Abstract ( )   PDF (1283KB) ( )   In the context of achieving "peak carbon" by 2023, the urban transportion sector has become a major contributor to carbon emissions. In order to alleviate the environmental impact of urban transportation carbon emissions, this paper uses the "down-top method" to measure the carbon emissions of urban transportation in Lhasa from 2013 to 2022, and selects the factors that have a high impact on carbon emissions, such as the total population, gross domestic product (GDP), motor vehicle ownership, and passenger and freight turnover of Lhasa, and analyzes the influencing factors by using the partial least squares regression analysis model. Therefore, it is concluded that freight turnover, motor vehicle ownership, passenger turnover, and gross national product have a promoting effect on carbon emissions, while the impact of local tourists, total population, and public transport passenger volume is relatively low. Therefore, energy conservation and emission reduction measures are proposed accordingly, which provides a favorable reference for the influencing factors of urban transportation carbon emissions in other regions. References | Related Articles | Metrics

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Influence of Reactive Control Compression Ignition on the Performance of Internal Combustion Engines GUO Pengxiang 2024, 49(10): 175-180.  DOI: 10.16638/j.cnki.1671-7988.2024.010.037 Abstract ( )   PDF (1194KB) ( )   In recent years, the combustion of fossil fuels in automotive internal combustion engines has posed significant challenges to the environment and global energy. Exploring efficient and low emission combustion methods is urgent for the development of internal combustion engines. This paper analyzes the impact of low-temperature premixed combustion on the performance of internal combustion engines by consulting relevant literature and combining it with current research hotspots, by introducing of homogeneous charge compression ignition (HCCI) and premixed charge compression ignition (PCCI), analyzing the shortcomings of them, and the combustion method of reactivity controlled compression ignition (RCCI) are analyzed. This paper analyzes the combustion principle, heat release process, and combustion characteristics of RCCI, and combines the effects of dual fuel and single fuel strategies on engine combustion and emission characteristics in RCCI combustion. It is concluded that RCCI engines can achieve higher thermal efficiency and ultra-low NOX and particulate matter (PM) emission, however, there is still room for further improvement in RCCI. References | Related Articles | Metrics