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12 June 2024, Volume 49 Issue 11 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management


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New Energy Vehicle

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Integrated Development and Optimization of Electromechanical Coupling System for Parallel Hybrid SUV ZHOU Bihai 2024, 49(11): 1-7.  DOI: 10.16638/j.cnki.1671-7988.2024.011.001 Abstract ( )   PDF (1457KB) ( )   An electromechanically coupled powertrain configuration is developed for a parallel hybrid electric vehicle to enhance its fuel economy and dynamics. First, the configuration of the hybrid electric vehicle is analyzed to determine that the selected drive mode of the powertrain is P2 parallel hybrid, and the electromechanical coupling method of coaxial torque coupling is adopted. Then, the engine and motor are selected by combining the relevant data of the prototype vehicle, and the theoretical calculation method is used to match the parameters of the electromechanical coupling system. In order to obtain the optimal matching scheme, the integrated optimization of the designed electromechanical coupling system is carried out with the orthogonal experimental design method, and a set of optimal matching values of electromechanical coupling parameters are obtained. Finally, a multi-objective optimization of the driveline parameters is implemented to obtain the optimized transmission ratios. References | Related Articles | Metrics

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Design of Hydrogen Engine System Based on Waste Heat Ladder Utilization GUO Yihong 2024, 49(11): 8-13.  DOI: 10.16638/j.cnki.1671-7988.2024.011.002 Abstract ( )   PDF (1375KB) ( )   Hydrogen fuel has attracted much attention in the research field of hydrogen engines and power plants due to its advantages of zero carbon dioxide emissions and the ability to treat toxic gases such as NOX. However, the fuel conversion efficiency defined by the Carnot cycle cannot exceed 50%, which is a significant distance from conventional engines. For this purpose, the article constructs a hydrogen engine system that integrates compressed chamber air pressurization, internal combustion chamber hydrogen combustion expansion work, and low-grade waste heat energy recovery in the expansion chamber. The system adopts the method of storing hydrogen in organic liquid form, and establishes an efficient waste heat cascade utilization system based on the hydrogen internal combustion engine. High quality waste heat is used for hydrogen source dehydrogenation, and medium and low quality waste heat is subjected to Rankine cycle to achieve the cascade utilization of waste heat resources. The design of this system not only has important scientific research value, but also has profound impacts on multiple aspects such as economic, environmental, and social sustainable development. References | Related Articles | Metrics

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Optimization Analysis of Radiated Noise of New Energy Drive Assembly ZHAO Hongyang 2024, 49(11): 14-17,28.  DOI: 10.16638/j.cnki.1671-7988.2024.011.003 Abstract ( )   PDF (1722KB) ( )   In order to study the problem of radiated noise of vehicle six-phase motor, this paper takes a certain electric drive assembly as the research object, tests and analyzes its noise, vibration and harshness (NVH) performance on end of line (EOL) bench. Test results show that the 48th order noise of the motor exceeds the target in the frequency band range of 988～1 325 Hz and 1 966～2 200 Hz, and the maximum excess scalar is about 7 dB. Then, using the method of combining theoretical analysis and simulation, it is concluded that the cause of the noise problem is that the radial electromagnetic force of the 12th order of the electrical frequency is too large, which provokes the structural mode of the 1 121 Hz and 2 023 Hz systems, and the stator vibration is caused by the noise radiated from the oil pan after the structure is amplified. In order to solve the problem of large radial electromagnetic force, this paper adopts an evolutionary algorithm to weaken the radial electromagnetic force of the 12th order harmonic of the 0th order time in space by using the rotor opening auxiliary slot and scheme. At the same time, the modal mode amplitude is reduced by optimizing the oil pan structure. Finally, the NVH performance of the motor is verified by simulation method, and the effectiveness of the scheme is verified. References | Related Articles | Metrics

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Motor Based on Acceleration Feedback Quick Shifting Method ZUO Jia 2024, 49(11): 18-21.  DOI: 10.16638/j.cnki.1671-7988.2024.011.004 Abstract ( )   PDF (822KB) ( )   During the shifting process of commercial vehicles, there may be a brief power interruption, so the timing of the motor directly affects the power interruption time. The power interruption time determines the quality of gear shifting. This article proposes a fast shifting method for transmission based on differential negative feedback, which performs differential processing on the speed feedback of the driving motor and extracts information on the speed change from the speed feedback information. Then, it is adjusted by a proportional integral controller to output command torque, thereby achieving rapid speed adjustment of the driving motor. References | Related Articles | Metrics

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Study on Control Strategy and Economy of Parallel Hybrid Heavy Dump Truck PING Yan 2024, 49(11): 22-28.  DOI: 10.16638/j.cnki.1671-7988.2024.011.005 Abstract ( )   PDF (2257KB) ( )   Aiming at the economy evaluate of the parallel hybrid heavy dump truck, the article proposes a logic threshold control strategy and establishes a co-simulation model based on Cruise and MATLAB/Simulink to study the economy of parallel hybrid heavy-duty dump trucks. Firstly, the key powertrain is selected and the parameters are matched to establish the vehicle simulation model. Then, the hybrid control strategy model is established by using the logic threshold method based on torque factor. Meanwhile, the vehicle model and the hybrid control strategy model are co-simulated. The economy of the whole vehicle under china world transient vehicle cycle (CWTVC) and china heavy-duty test cycle-dumper (CHTC-D) is emphatically analyzed, and the simulation and test results are compared and analyzed. The results show that the fuel savings are 16.7% and 6.4% respectively under the CWTVC cycle charge depleting (CD) and charge sustain (CS) mode. Under the CHTC-D cycle condition, CD mode and CS mode save 39.6% and 25.4% respectively. The economic error of the simulation and test results is 0.49 L/100 km, and the fuel saving rate error is less than 1.5%. The established economic simulation model has high accuracy, and the proposed strategy can significantly improve the fuel economy of hybrid heavy-duty dump trucks. References | Related Articles | Metrics

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The Development Trend of Steering System for New Energy Light Truck Logistics Vehicle ZHAO Weifeng 2024, 49(11): 29-32,64.  DOI: 10.16638/j.cnki.1671-7988.2024.011.006 Abstract ( )   PDF (1175KB) ( )   The development of new energy vehicles is an important strategy for implementing national energy-saving, emission reduction, and low-carbon economic policies. With the vigorous development of intelligence, the development trend of the steering system for new energy light truck logistics vehicle has shifted from traditional electric hydraulic power steering (EHPS) system to pure electric power steering (EPS) system. In the future, pure wire controlled steer by wire (SBW) technology will be implemented. This article combines the structure, principles, and control logic and comparison of advantages and disadvantages, briefly discussing the development trend of new energy light truck logistics vehicle steering system. References | Related Articles | Metrics

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Research on the Influencing Factors of WLTC Driving Range of Battery Electric Vehicle under Different Ambient Temperatures HE Jiajun 2024, 49(11): 33-39.  DOI: 10.16638/j.cnki.1671-7988.2024.011.007 Abstract ( )   PDF (2834KB) ( )   In order to explore the influence of different ambient temperatures on driving range and power consumption, this paper takes a battery electric vehicle model as an example, and carries out the standard worldwide light-duty test cycle (WLTC) range test at room temperature of 23 ℃, high temperature of 35 ℃, and low temperature -7 ℃, and quantitatively analyzes the energy transfer characteristics of vehicles at different ambient temperatures by establishing an energy flow analysis model. The results show that the influence of ambient temperature on the charging and discharging characteristics of the battery, the increase of energy consumption of the thermal management system, the influence of the energy conversion efficiency of the electric drive system, and the increase of low temperature simulation resistance are the main reasons for the decrease of vehicle mileage and the increase of power consumption. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Development of DDS Communication Middleware for Resource-Limited Devices SHI Wenzheng 2024, 49(11): 40-46.  DOI: 10.16638/j.cnki.1671-7988.2024.011.008 Abstract ( )   PDF (1502KB) ( )   Given the current situation that the automotive open system architecture (AUTOSAR) classic platform (CP) and adaptive platform (AP) will co-exist in vehicles for a long time, the deployment of data distribution service (DDS) on resource-limited devices in vehicles has become a hot issue of concern. Most DDS is relatively large and not suitable for deployment on embedded devices with limited resources presently. In this paper, an in-depth study is conducted on how to deploy DDS on resource-limited devices in vehicle scenarios. Relevant trimming and optimization of DDS functions are conducted, and a lightweight DDS communication middleware is developed using C language. The deployment of DDS on AUTOSAR/CP is completed based on AUTOSAR tool chains of Vector. The DDS is tested and validated on Xavier+TC397 platform based on automatic parking assist (APA) scenario in real vehicles. The results show that the communication based on DDS worked properly and a good parking performance is achieved. References | Related Articles | Metrics

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Investigation and Rectification of Vehicle Power Loss Caused by Complex Electromagnetic Environment ZHONG Xiangyu 2024, 49(11): 47-50.  DOI: 10.16638/j.cnki.1671-7988.2024.011.009 Abstract ( )   PDF (2451KB) ( )   With the increasing of national infrastructure such as substations, power transmission networks, broadcast base stations and communication base stations in the natural environment, the electromagnetic environment is becoming more and more complex, and the rapid development of automobiles to electrification, intelligence and network connection requires more and more electronic and electrical support. Based on the fault case of an intelligent networked vehicle with power loss in a complex electromagnetic environment, the electromagnetic environment of the fault location is collected for playback simulation test in the vehicle electromagnetic magnetic compatibility, and the problem is accurately located because the static current of the vehicle exceeded the standard due to the influence of the electromagnetic environment on the air conditioning controller. The ignition circuit of the air conditioner controller is rectified through the electromagnetic magnetic compatibility test of the parts and the vehicle, so that the air conditioner controller passed the electromagnetic magnetic compatibility test certification of the parts and the vehicle. After the air conditioner controller passed the rectification test, it is repeatedly verified at the fault site after loading the vehicle, and the static current would not fluctuate abnormally, effectively solving the power loss problem of the vehicle affected by the electromagnetic environment. References | Related Articles | Metrics

Design and Research

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Research on the Gear Control System of Target Vehicle by Wire Control Chassis NING Tao 2024, 49(11): 51-55.  DOI: 10.16638/j.cnki.1671-7988.2024.011.010 Abstract ( )   PDF (2363KB) ( )   In this paper, the automatic gear control system of the wire-controlled chassis of target vehicle is studied, the traditional manual gear control mechanism is transformed to having the ability of automatic gear shifting control. In mechanical structure, a set of gear shifting mechanism is designed, which can realize gear shifting by controlling two push rod motors in X direction and Y direction. In control, a special gear controller is developed, which can control the forward and reverse rotation of the two-way motor and accurately control the stroke distance, and has the gear feedback function to realize closed-loop control. In the control software, a complete set of control logic is designed. By sending specific gear control instructions to the gear controller, the gear control of the target vehicle's drive-by-wire chassis can be realized. References | Related Articles | Metrics

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Analysis and Reduction Measures of Intake Noise on a Heavy Truck LIANG Fengdian 2024, 49(11): 56-59.  DOI: 10.16638/j.cnki.1671-7988.2024.011.011 Abstract ( )   PDF (1179KB) ( )   According to the drumming sound in the driver's cab of a heavy truck in the conditions of under low load and within a specific speed range, firstly, this paper determines that the intake system is the source of noise transmission through subjective evaluation; then, the noise propagation path is locked by change evaluation; finally, combined with the experimental testing, noise reduction measures are proposed from different dimensions; finally, the comprehensive noise reduction measures of increasing the thickness of the intake flat tube, adjusting the stiffness of the rubber cushion at the connection between the intake flat tube and the body and attaching the damping plate are adopted to reduce the intake noise, and the actual vehicle verification is carried out. This paper solves the problem of excessive air intake noise in the vehicle, improves the quality of the vehicle, greatly improves the driving experience of the driver and passenger, provides a reference for the optimization design of vehicle noise, vibration, harshness (NVH) performance, and has practical guidance significance for the subsequent noise reduction work of the vehicle. References | Related Articles | Metrics

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Research and Optimization of Safety Belt Bracket Knocking Issue on a SUV WANG Zongwen 2024, 49(11): 60-64.  DOI: 10.16638/j.cnki.1671-7988.2024.011.012 Abstract ( )   PDF (1798KB) ( )   Vehicle knocking noise can increase user fatigue, significantly reduce comfort experience. Therefore, in the development stage of automobiles, it is necessary to attach great importance to and optimize the solution of noise problems. During the development phase of a certain sports utility vehicle (SUV), an internal assessment found that there is a noticeable knocking noise when pulling the seat belt strap. After objective analysis and cross validation, it is confirmed that the knocking noise originated from the impact between the webbing guide buckle and the metal bracket. In response to this problem, a short-term solution is developed through analysis and experimental verification: using felt to eliminate the gap between the guide buckle and the bracket. At the same time, a long-term solution is formulated: optimizing the design size. Finally, the problem of knocking noise is solved, the effectiveness of the optimization plan is verified, and the scrapping of bracket parts is avoided. At the same time, the problem is quickly and efficiently solved, ensuring that the entire vehicle project is put into production on time and providing technical experience for subsequent vehicle development. References | Related Articles | Metrics

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Analysis and Rectification on Noise of Exterior Weatherstrip During Glass Lowering SHEN Hongbo 2024, 49(11): 65-69，74.  DOI: 10.16638/j.cnki.1671-7988.2024.011.013 Abstract ( )   PDF (1526KB) ( )   According to the research of "grunting" abnormal sound problem when the door glass drops, it is found that the stability of weatherstrip itself is the reason of abnormal sound. By changing the friction characteristics of the contact surface, the external weatherstrip problem is confirmed. Based on the self-locking sliding mechanism and finite element simulation, the abnormal sound principle of weatherstrip turning knocking sheet metal in stick-slip motion is studied clearly, and the reason of abnormal sound in high temperature dust weather is explained. Taking into account the impact of layout space and natural environment, exclude the change of lip angle and friction coefficient, and analyze the three potential causes of abnormal sound, extend the weatherstrip barb against the sheet metal, eliminate the possibility of weatherstrip knocking sheet metal, and completely solve the problem of abnormal sound. References | Related Articles | Metrics

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Design and Development of Testing Experimental Device for Automotive Electrical Components XU Changzhao 2024, 49(11): 70-74.  DOI: 10.16638/j.cnki.1671-7988.2024.011.014 Abstract ( )   PDF (2712KB) ( )   With the rapid development of the automotive industry, the detection technology of automotive electrical components has become increasingly important. This article mainly discusses the design and development of a comprehensive experimental device for automotive electrical component detection, and introduces the design plan, development process, and technical implementation of the experimental device, including the application of key technologies and methods. The experimental results show that the developed experimental device has good functionality and performance, can accurately detect automotive electrical components, and has certain advantages compared to existing technologies. References | Related Articles | Metrics

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Research on the Cracking Problem of Base Cap of Automobile Shock Absorber SUN Minglei 2024, 49(11): 75-78.  DOI: 10.16638/j.cnki.1671-7988.2024.011.015 Abstract ( )   PDF (2554KB) ( )   As a key part of automobile chassis, the shock absorber is cracked during driving, which seriously affects its service life. Aiming at the rear shock absorber bottom cover cracking problem of a certain model, this paper introduces the background of the problem in detail, the troubleshooting process of the problem, and confirms the state of the fault part through the disassembly of the fault part, welding strength analysis and welding penetration analysis. The failure problem of shock absorber is reproduced by bench test and the cause of the problem is obtained by computer aided engineering (CAE) force analysis. Then the rectification plan is formulated according to the stress situation of the cracking position. Finally, the effect of the improvement is verified. Through the welding strength analysis, CAE fatigue analysis, bench verification and road reliability test, the cracking problem of the shock absorber bottom cover is effectively solved and the rectification plan is quantitatively improved. This paper provides guidance for the analysis and rectification of similar auto parts cracking problems. References | Related Articles | Metrics

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Research and Application of Engagement Probability for Dog Clutch in Automatic Transmission HE Jun 2024, 49(11): 79-85.  DOI: 10.16638/j.cnki.1671-7988.2024.011.016 Abstract ( )   PDF (1553KB) ( )   In this paper, a dog clutch of a nine-speed automatic transmission is used as the research object, and the dynamics model of each stage of clutch engagement is established. According to the design characteristics of long and short teeth, the probability of gear engagement under different initial speed difference conditions is calculated for four scenarios: without any tooth contact, long tooth contacting long tooth, long tooth contacting short tooth, long tooth contacting long tooth and long tooth contacting short tooth simultaneously. Considering final speed difference for random tooth contact position, the optimal initial speed difference of the dog clutch is calculated, which can be used for the formulation of the optimal shift strategy for coasting downshifts to improve the shift quality. The results are consistent with the theoretically calculated probabilities for coasting downshifts from fifth gear to fourth gear in real vehicle conditions. References | Related Articles | Metrics

Testing and Experiment

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Performance Analysis and Structural Crashworthiness Design of Vehicle Side Barrier LI Xueyan 2024, 49(11): 86-91.  DOI: 10.16638/j.cnki.1671-7988.2024.011.017 Abstract ( )   PDF (2727KB) ( )   China-new car assessment programme and vehicle insurance index both has been launched suitable for China-moving deformable barrier (SC-MDB) and advanced Chinese-moving deformable barrier (AC-MDB). In this paper, the structural characteristics of the new and old side impact barriers, the difference of aluminum honeycomb parameters and impact energy are compared, and the compression deformation of different barriers is analyzed by simulation. The impact of different barriers on the crashworthiness design of the side structure of the body is analyzed by using the collision model of a vehicle. Aiming at the problem of increased intrusion of B-pillar and front and rear doors caused by the side impact condition of the new version of SC-MDB and AC-MDB, by improving the force transmission path of the seat beam of the body, increasing the strength of the threshold, B-pillar and door anti-collision rod and other structures, the intrusion deformation of the side impact body is reduced, and the structural optimization design method of the side impact condition of the new version is provided. The simulation results verify the effectiveness of the optimization method, and provide optimization ideas and references for the structural crashworthiness design of similar vehicles. References | Related Articles | Metrics

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Simulation Analysis and Experimental Study on Reducing Oil Consumption of Dongfeng EQH Gas Engine HUANG Shuo 2024, 49(11): 92-96，131.  DOI: 10.16638/j.cnki.1671-7988.2024.011.018 Abstract ( )   PDF (1450KB) ( )   Engine oil is one of the essential oils in the engine. Excessive engine oil consumption not only damages the engine to varying degrees, but also threatens the air quality. Through the method of combining simulation and test, the paper analyzes the high engine oil consumption of EQH gas engine, uses AVL EXCITE Piston & Rings of the engine simulation software, finds out the reasons of the high engine oil consumption according to the simulation results, and carries out optimization improvement and experimental verification. The experimental results show that the improved fuel combustion ratio is reduced from 0.32% to 0.034%, which achieves the expected effect of improvement. References | Related Articles | Metrics

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Discussion on Inspection Technology Method of Electric Drive Assembly After Test MIAO Jun 2024, 49(11): 97-101.  DOI: 10.16638/j.cnki.1671-7988.2024.011.019 Abstract ( )   PDF (2134KB) ( )   In order to accurately evaluate the performance of electric vehicle drive motor assembly, the post-test inspection technology is discussed. Taking three-in-one electric drive assembly as the object of discussion, the methods of system appearance and detail inspection, electrical performance test, airtight performance test and residual torque measurement of mechanical connection screw are emphatically introduced. The inspection specification is to first confirm the overall appearance and interface details of key components, then test the assembly insulation resistance and direct current voltage resistance and ground resistance parameters, then test the pressure leakage rate of the oil circuit of the whole machine, the motor drying chamber and the pressure regulator vent valve film, and finally test the residual torque of the fastening screw during mechanical disassembly, and test the electrical parameters of the fixed rotor, and component joint surface and functional parts appearance inspection, etc. According to relevant test standards, the applicable inspection process and method are summarized, which provides strong support for the test development and verification of electric drive assembly. References | Related Articles | Metrics

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Study on Energy Consumption at Low Temperature Based on Engery Flow Analysis ZOU Ju 2024, 49(11): 102-105.  DOI: 10.16638/j.cnki.1671-7988.2024.011.020 Abstract ( )   PDF (1084KB) ( )   In order to study the main factors leading to the deterioration of power consumption under low temperature environment, the energy consumption of various components of China light-duty vehicle test cycle passenger car (CLTC-P) under normal temperature (23 ℃) and low temperature (-7 ℃) is measured by the energy flow analysis method of the vehicle. The test results show that the main components of energy consumption difference between low temperature and normal temperature are electric drive, compressor, low pressure fan, blower, water pump, etc. The increase of compressor and electric drive consumption accounts for a large proportion, so the focus is on analyzing the reasons for the deterioration of low-temperature electric drive, and the theoretical analysis of the reasons for the deterioration of low-temperature electric drive energy consumption are the deterioration of low-temperature chassis resistance, the increase of low-temperature electric drive lubricating oil viscosity, and the deterioration of motor efficiency. In order to verify the influence of lubricating oil temperature on electric drive power consumption, the electric drive oil temperature is controlled by the flow rate of electric drive pump, and the power consumption is tested under low temperature CLTC-P condition. In order to verify the energy consumption difference between the low temperature electric drive waste heat pump system and self-heating electric drive oil temperature, the electric drive power consumption, compressor power consumption and electric drive oil temperature are recorded simultaneously during the experiment. The experimental results show that the total power consumption of electric drive waste heat self-heating oil temperature is better. References | Related Articles | Metrics

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Research on the Application of Negative Oxygen Ion Technology in Automobile Layout ZHU Shunkuan 2024, 49(11): 106-109.  DOI: 10.16638/j.cnki.1671-7988.2024.011.021 Abstract ( )   PDF (1116KB) ( )   In recent years, the state of air quality has been widely concerned and valued. Some research results show that the state of air quality in automobile is one of the very bad places, and the use of automobile has become more and more common, which puts forward more and higher requirements for the air quality in automobile. Firstly, the function and principle of negative oxygen ion technology are introduced in this paper, especially the application of negative oxygen ion technology in automobile is studied and analyzed. Secondly, it is mainly to arrange different numbers of negative oxygen ion generators in different positions in the automobile, and test the number of negative oxygen ions in the air conditioning outlet and the head area of the driver and passenger, so as to obtain the relationship between the purification effect of negative oxygen ion and the location and number of layout. Finally, the relationship between the concentration of negative oxygen ion and the air volume and mode of the air conditioner can be obtained by testing the number of negative oxygen ions in the air outlet and the driver's head area under different air volume and mode of the air conditioner. The results show that when the negative oxygen ion generator is arranged in the air outlet of the air conditioning blowing surface, it can bring better air quality purification effect in the automobile, while the use of larger air volume blowing will bring higher concentration of negative oxygen ions. The research results provide a basis for the application of negative oxygen ion technology in automobile layout, and have certain practical value. References | Related Articles | Metrics

Process·Materials

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Research on Frame Defect Detection and Recognition Method Based on Image Registration XU Zhenhua 2024, 49(11): 110-114.  DOI: 10.16638/j.cnki.1671-7988.2024.011.022 Abstract ( )   PDF (2747KB) ( )   Aiming at the shortcomings of low efficiency, low accuracy and high labor intensity in the detection and recognition of chassis frame shape defects on the assembly line, a frame defect detection and recognition method based on image registration is proposed. The standard image is obtained, and the shape matching template is established by the maximum between class variance method and morphology. The frame image to be tested is collected online, and the position and rotation angle of the frame image to be tested in the standard image are found by using the shape template matching algorithm. The frame image to be tested is registered so that it is in the same spatial position relationship with the standard frame image. The target image to be tested is matched with the standard library image by logical XOR, and the interference defects and impurities in the system are removed by morphological algorithm. After RGB component filtering, the image is overlapped and the transparency is adjusted to obtain the defect image. The research results show that this method can effectively extract the shape characteristics of the frame, and then obtain a variety of shape defects such as over riveting, missing riveting, porous, few holes, etc., with fast detection speed and good robustness. References | Related Articles | Metrics

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Application of Magnesium Alloy in Cross Car Beam of Commercial Vehicle ZHANG Long 2024, 49(11): 115-119.  DOI: 10.16638/j.cnki.1671-7988.2024.011.023 Abstract ( )   PDF (2041KB) ( )   With the rapid development of new energy in the field of trucks, the lightweight and appearance quality of commercial vehicles are also paid more and more attention. Magnesium alloy has many advantages, such as low density and excellent casting performance, and has been widely used in structural parts such as cross car beam of passenger cars, but it is still blank in the field of heavy trucks. In this paper, by using casting magnesium alloy and aluminum alloy stamping parts, a heavy truck cross car beam of magnesium alloy is designed and developed to replace the original steel cross car beam. The results show that compared with steel, the weight of cross car beam of magnesium alloy is reduced by 53%, the strength safety factor of the cross car beam is increased by 10%, 30% and 50% respectively under braking, turning and vertical impact conditions, and the stiffness is increased by 30%. References | Related Articles | Metrics

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The Utility Model Relates to an Image Processing Method for Detecting the Depth of Rolling Pass of Automotive Bars ZHU Fuwen 2024, 49(11): 120-122,136.  DOI: 10.16638/j.cnki.1671-7988.2024.011.024 Abstract ( )   PDF (1627KB) ( )   At present, the detection of the depth of bar rolling passes in China relies entirely on manual measurement. Different personnel may result in different results, which may lead to significant deviations in roll gap settings. To achieve the purpose of automatic measurement of hole depth mentioned above, this paper studies a method for detecting hole depth in bar racks based on standard comparative magnetic rods as specimens, parallel light source optical imaging as a means, and image processing technology, as well as related mathematical modeling and algorithms. The above method can balance the convenience and accuracy of on-site roll changing operation and production preparation, and has the characteristics of high accuracy and easy operation. On site experiments have shown that the hole depth detection method based on image processing can achieve a measurement accuracy of less than 0.2 mm and is relatively stable, which has certain practical application value for guiding actual industrial production. References | Related Articles | Metrics

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Optimization of the Overall Assembly Plan for Commercial Vehicle Instrument Assemblies ZOU Li 2024, 49(11): 123-126.  DOI: 10.16638/j.cnki.1671-7988.2024.011.025 Abstract ( )   PDF (1659KB) ( )   With the rapid development of the automotive industry, users have increasingly high requirements for the dashboard assembly in the cockpit. Currently, TY company still uses traditional plate chain lines for assembly. In response to the problems of limited workstations, multiple types of components, low automation level, difficulty in tooling vehicle recycling, and the need for manual handling of the dashboard assembly, the assembly process of the dashboard assembly is redivided and the pace is balanced. The dedicated assembly line reduces the stacking of materials on the line, reduces the number of production tooling vehicle recycling operators, reduces the intensity of finished product offline transportation, improves material warehousing management ability. References | Related Articles | Metrics

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Application of Stationary Welding Gun Asynchronous Tip Dressing in Body Shop TIAN Tao 2024, 49(11): 127-131.  DOI: 10.16638/j.cnki.1671-7988.2024.011.026 Abstract ( )   PDF (2009KB) ( )   Automotive automatic welding production line, the welding gun need to be tip dressed after welding a certain amount of points, which will affect the actual output of the production line. Especially the stationary welding gun with swing arm tip dresser has a greater impact. This paper introduces the current situation of stationary gun with swing arm tip dressing, and analyzes the time sequence of the grinding process. For the application of handling robots with stationary welding gun, when the robot is carrying out the handling work, the welding gun as an independent axis of separate movement can achieve the tip dressing. After the completion of the weld, the foreground program to determine whether it is necessary to tip dress. If it is necessary, then turn on the asynchronous mode and trigger the background dressing procedure to start. The background program can control the welding gun as an independent axis and the swing arm tip dresser to achieve the dressing process following the time sequences. Before welding starts, the foreground program turns off the asynchronous mode to restore the linkage of the welding gun. By implementing the asynchronous tip dressing function in a production line and comparing the average hourly output of a single shift before and after the implementation, it is found that the output of the production line has been improved obviously after the implementation. References | Related Articles | Metrics

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Research on Application of Thermal Conductive Adhesive in Power Battery HOU Shaojie 2024, 49(11): 132-136.  DOI: 10.16638/j.cnki.1671-7988.2024.011.027 Abstract ( )   PDF (1508KB) ( )   The purpose is to explain how to apply thermal conductive adhesive correctly, maximize the thermal conductivity of thermal conductive adhesive, and improve the thermal management efficiency of power batteries during use. This paper summarizes the application of thermal conductivity adhesive in power battery, analyzes the common failure mode of thermal conductivity adhesive in process application process and the possible causes such as substandard thermal conductivity adhesive, equipment parameter setting, surface cleanliness, etc., and puts forward application suggestions and countermeasures for thermal conductivity adhesive viscosity and process control. The quality control of the coating of thermal glue is carried out through the quality management tool of statistical process control (SPC). Thereby improve the power performance, safety performance, and service life of power batteries. At the same time, it also contributes to the application of thermal conductive adhesive in the battery industry engineering in China. References | Related Articles | Metrics

Automobile Education

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Moral Education Current Situation and Ability Training of Young Teachers of Automobile Major in Vocational Colleges LUO Ji 2024, 49(11): 137-141.  DOI: 10.16638/j.cnki.1671-7988.2024.011.028 Abstract ( )   PDF (1071KB) ( )   In order to solve the outstanding problems such as the low moral education level of young teachers in vocational colleges, the long-term separation of "technical education" and "moral education", the lack of moral education design and the lack of attractiveness of moral education, a case study is carried out to analyze the current situation of moral education of young teachers in vocational colleges. Aiming at the young teachers of automobile major, this paper studies the reform direction of their moral education ability cultivation from the government level, school level and teacher level, proposes to build a comprehensive, multi-level and three-dimensional service system for the moral education quality cultivation of young teachers of automobile major in vocational colleges, and proposes to establish a development mechanism conducive to the moral education ability of young teachers of automobile major in vocational colleges. It provides reference for vocational colleges to carry out targeted cultivation of young teachers' moral education ability. References | Related Articles | Metrics

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Exploring the Development of Higher Vocational Colleges Automotive Programs in the Context of Industry-Education Integration QIU Yu 2024, 49(11): 142-145.  DOI: 10.16638/j.cnki.1671-7988.2024.011.029 Abstract ( )   PDF (953KB) ( )   This paper discusses the opportunities and challenges facing the automotive technology specialty in the context of industry-education integration. As the key direction of the future automobile industry, the demand for new energy automobile technical talents is gradually increasing, which provides a unique development opportunity for higher vocational colleges. However, higher vocational colleges also face a series of challenges in the process of integration of industry-education integration. Higher vocational colleges need to deepen the construction of industry-education integration, and build an interactive system of automotive professional innovation to meet the needs of students and the industry, and further promote the sustainable development of this field. References | Related Articles | Metrics

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Discussion on Talent Training Strategy of Intelligent Vehicle Engineering Specialty －Take Hubei University of Automotive Technology as an Example WU Tong 2024, 49(11): 146-148,174.  DOI: 10.16638/j.cnki.1671-7988.2024.011.030 Abstract ( )   PDF (1128KB) ( )   In order to meet the needs of the development of the automobile industry, the university relies on the advantages of traditional vehicle engineering specialty, adding intelligent vehicle engineering specialty. In order to build a more modern industry in line with the needs of automotive talents, this paper proposes intelligent vehicle engineering professional training program. Determined to train "Pro-industry, thick foundation, strong cross-cutting, innovation-oriented" intelligent electric vehicle compound talents as the goal, pay attention to traditional vehicles and new energy vehicles, intelligent connected vehicles cross-integration, the construction of intelligent curriculum system and diversified practical teaching platform will lay a solid foundation for training all-round talents to adapt to the development of modern automobile technology. References | Related Articles | Metrics

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Exploration on the Experimental Curriculum Teaching and Its Effect of Automotive Electronics in the View of Collaborative Education LI Min 2024, 49(11): 149-152,157.  DOI: 10.16638/j.cnki.1671-7988.2024.011.031 Abstract ( )   PDF (1458KB) ( )   In order to enable teachers and students to adapt to social changes and improve sustainable learning ability, this paper takes Experiment for Principle and Application of micro controller unit (MCU) as an example to explore the curriculum optimization reform from the perspective of collaborative education, and puts forward the teaching and education ideas of personnel collabora-tion, institutional collaboration, online and offline collaboration, and skill and accomplishment coordination. It has optimized the experimental teaching content, enriched the experimental completion link, further improved the project management mode of the experimental project implementation, consolidated the foundation in the teaching process of the experimental curriculum, focused on the application of automotive electronic control, teaching from learning, and teachers and students advance together. References | Related Articles | Metrics

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Research on the Development of "Double-qualified" Teacher Team in the Automotive Field in Higher Vocational Colleges under the Background of Digitalization ZHANG Yintao 2024, 49(11): 153-157.  DOI: 10.16638/j.cnki.1671-7988.2024.011.032 Abstract ( )   PDF (1214KB) ( )   With the development and application of digital technology, higher vocational education is facing new challenges and opportunities. As the main force of automotive vocational education, "double-qualified" automotive teachers in higher vocational colleges need to continuously improve their professional abilities to adapt to the education and teaching needs of the digital era. Based on the perspective of digital background, this article analyzes the characteristics of "double-qualified" automotive teachers in higher vocational colleges and their importance to career development,and proposes the professional skills capabilities of "double-qualified" automotive teachers. According to the requirements, this paper discusses the paths and strategies for improving the professional abilities of "double-qualified" automotive teachers in higher vocational colleges based on the current predicament, and provides a reference for the digital training and development of "dual-qualified" automotive teachers in higher vocational colleges. References | Related Articles | Metrics

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Construction of Talent Training Model for New Energy Vehicle Technology Majors in Vocational Colleges in the Digital Era ZHANG Jiarui 2024, 49(11): 158-161.  DOI: 10.16638/j.cnki.1671-7988.2024.011.033 Abstract ( )   PDF (1026KB) ( )   Digitalization of education is the foundation for building a strong education country. Education must adapt to the changes brought about by emerging technologies and accelerate its own transformation, cultivating the new generation needed by society. The production and sales of new energy vehicles have experienced explosive growth in the past two years, which is led to a series of problems in the cultivation of high-quality and versatile craftsmen in the field of new energy vehicle technology. In order to improve the quality of talent cultivation in the new energy vehicle industry, summarize the current situation of talent cultivation in new energy vehicles, analyze the influencing factors of talent cultivation in new energy vehicles in vocational colleges and the significance of educational digitization for talent cultivation. Based on the background of digital education and combined with new generation information technology, this article constructs a new energy vehicle talent cultivation model, enhances the adaptability of talent cultivation in this profession, solves the personalized training problems under the needs of industrial development and large-scale teaching, and provides reference for the talent cultivation of new energy vehicle technology majors in relevant vocational colleges. References | Related Articles | Metrics

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Teaching Case Exploration and Practice of Ideological and Political Teaching of Maintenance of Hybrid Vehicle Course ZAN Xuesong 2024, 49(11): 162-165.  DOI: 10.16638/j.cnki.1671-7988.2024.011.034 Abstract ( )   PDF (1155KB) ( )   In order to integrate professional knowledge and skills education with value guidance, and implement the fundamental task of cultivating morality and talent, taking the course Hybrid Electric Vehicle Maintenance as an example, combined with the characteristics of automotive professional education and curriculum teaching, the learning and psychological characteristics of vocational college students is analyzed, course design and practice are carried out, the goals and framework for ideological and political education in the curriculum are formulated.The ideological and political content of the course is summarized as high pressure safety and standardized operation awareness, with a team spirit of cooperation; Enhance students' sense of national manufacturing pride; The mission of cultivating students' skills and serving the country; Cultivate students' spirit of conscientious practice, courage to explore, and excellence in the maintenance process as a great country craftsman. Ideological and political education is carried out, and good results are achieved, it can provide certain reference for the ideological and political construction of other majors and courses. References | Related Articles | Metrics

Standards·Regulations·Management

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Optimize Automotive R&D Cycle Using Network Diagram HU Xiaoman 2024, 49(11): 166-169.  DOI: 10.16638/j.cnki.1671-7988.2024.011.035 Abstract ( )   PDF (1091KB) ( )   Automotive R&D is a complex system engineering process. In order to better manage automotive R&D projects and achieve project objectives more effectively, leading automotive companies typically exercise comprehensive control over their R&D projects, encompassing elements such as progress, quality, cost, scope, change, risk, and stakeholders. Progress directly determines the speed at which new products are launched, making it a critical factor in competition within the industry. Therefore, controlling progress is particularly important. The article introduces how to decompose the work items in the automotive development process, estimate the work item cycle, sort out logical relationships, draw network diagrams, and find ways to use critical paths to control project development progress, in order to optimize the automotive development cycle and improve resource utilization. References | Related Articles | Metrics

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Bolt Tightening Data Intelligent Management System Based on Power BI YONG Liang 2024, 49(11): 170-174.  DOI: 10.16638/j.cnki.1671-7988.2024.011.036 Abstract ( )   PDF (3702KB) ( )   For ensuring the safety and quality of vehicle assembly, a considerable number of tightening tools with monitoring are used to complete the assembly of vehicle parts. Meanwhile, the tightening data are statistically analyzed for the daily management. However, massive data generated in this process, and the traditional method for statistical analysis of tightening data has some problems. It causes low statistical efficiency and poor visualization effect. Consequently, this article processes the tightening data based on the intelligent analysis software Power BI, and builds an intelligent data management system. The system realizes the functions of automatic loading and automatic statistics, as well as automatic generation of visual report of massive tightening data. Through the system, business personnel can access the system freely to query reports. It greatly improves the efficiency of on-site tightening management. References | Related Articles | Metrics