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30 January 2023, Volume 48 Issue 2 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
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New Energy Vehicle

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Analysis on Intelligent Power Generation Strategy of Electric Vehicle Based on AGA YU Dong 2022, 48(2): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2023.02.001 Abstract ( )   PDF (741KB) ( )   The power battery capacity of electric vehicle is limited, which is one of the key factors troubling its promotion. If the battery capacity is blindly improved, the whole vehicle cost will be greatly increased. Therefore, under the premise that the power battery capacity of electric vehicle remains unchanged and the vehicle driving comfort and safety is guaranteed, it is very important to put forward the range improvement strategy. This paper proposes that the power generation strategy by loading wind generator and brake feedback motor is helpful for endurance, after analyzing the influence factors of wind power generation and braking energy feedback and studying the controlmodel structure of pure electric vehicle wind power generation and braking energy feedback system, the intelligent power generation energy model is established by taking into full consideration the resistance of the vehicle and improving the efficiency of electric energy conversion. Finally, the genetic algorithm is used to take air humidity, braking strength, battery state of charge, running speed and other factors as decision variables, simulation in Matlab software, obtained with the wind generator and brake feedback motor after smooth operation, the sum of wind power generation and braking energy feedback is at the best generating value, which verifies that the power generation strategy can improve the charging amount of power battery and increase the driving range of pure electric vehicles. References | Related Articles | Metrics

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Analysis on the Cultivation of Hydrogen Fuel Cell Vehicle Industry Based on Game Theory LIU Quan 2022, 48(2): 7-14.  DOI: 10.16638/j.cnki.1671-7988.2023.02.002 Abstract ( )   PDF (606KB) ( )   Hydrogen fuel cell vehicle is one of the trends of the future development structure of automobiles. At present, in the cultivation period of hydrogen fuel cell automobile industry, the interest coordination between industries has not been effectively analyzed, and the industrial development trend in the future maturity period is not clear. Based on Nash equilibrium theory, this paper analyzes the interest coordination among various stakeholders in the industry cultivation period. In the mature stage of industry, the mechanism of industrial strengthening and spatial diffusion between enterprises and government is discussed by using evolutionary game theory. Finally, through the discussion and analysis of the two models of industry cultivation and industry maturity, the paper puts forward reasonable suggestions that are conducive to the coordination between the government, research institutes and enterprises to promote development. References | Related Articles | Metrics

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Research on Segmented Dynamic Wireless Charging System ZHANG Bofeng 2022, 48(2): 15-19.  DOI: 10.16638/j.cnki.1671-7988.2023.02.003 Abstract ( )   PDF (1388KB) ( )   Dynamic wireless charging (DWC) technology will become an important technical means to solve the "range anxiety" and "difficulty in charging" problems of electric vehicles, but its rapid development is limited by high construction cost and impact of power grid. Therefore, based on the analysis of the problem by theory of the solution of inventive problems (TSIP) innovation method, this paper proposes a segmented dynamic wireless charging system to solve the existing problems. Segmented dynamic wireless charging system effectively solves the existing problems of dynamic wireless charging technology through segmented construction, equipment sharing, solar power generation, energy storage and other technologies. Through the feasibility verification of the prototype, this paper proves that the segmented wireless charging technology can meet the development of the future dynamic wireless charging technology and solve the problems faced by the future popularization of electric vehicles. References | Related Articles | Metrics

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Influence of Low Temperature on Pure Electric Vehicles LIU Qingyun 2022, 48(2): 20-24.  DOI: 10.16638/j.cnki.1671-7988.2023.02.004 Abstract ( )   PDF (1306KB) ( )   The promotion of the "new four modernizations" of the automotive industry is inseparable from the study of the adaptability of electric vehicles in extreme environments. From the perspective of the vehicle battery, this paper analyzes that the discharge terminal voltage and capacity of the lithium battery will decrease at low temperatures, and the internal resistance of the battery will increase, and it is deduced that the driving range of the pure electric vehicle is proportional to the voltage and capacity of the discharge terminal of the driving battery, and is inversely proportional to the internal resistance of the battery, so as to qualitatively analyze that the low temperature will reduce the driving range of the pure electric vehicle. Finally, the vehicle simulation was carried out by Cruise software, and it is concluded that under the cyclic working conditions of -15 °C, the driving range of pure electric vehicles decreased by 39.48% compared with normal temperature, while the driving range was reduced by 41.11% under the condition of 60 km/h isometric working conditions. References | Related Articles | Metrics

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Simulation Technology for Improving the Range of Electric Vehicle CUI Zhenyang 2022, 48(2): 25-28.  DOI: 10.16638/j.cnki.1671-7988.2023.02.005 Abstract ( )   PDF (804KB) ( )   Although the market share of electric vehicle has gradually increased, however, the charging time of electric vehicle is much longer than that of traditional fuel vehicles, therefore, at this stage, the range of electric vehicle still is the focus of consumers and car enterprises. According to the energy conversion principle and simulation analysis process of electric vehicle, the paper uses Matlab to build the simulation analysis model of electric vehicle under China light-duty vehicle test cycle passenger car (CLTC-P) working condition, and compares the results of real vehicle test and simulation analysis to verify the accuracy of simulation analysis, finally, changing the vehicle weight, rolling resistance, air resistance, electric drive efficiency and battery discharge in the simulation model, the influence of various factors on the range is obtained by the simulation analysis, which can provide a theoretical basis for vehicle enterprises to improve the range of electric vehicles. References | Related Articles | Metrics

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Design Optimization and Simulation Analysis of PHEV Battery Pack Thermal Management System WU Zhengjiang 2022, 48(2): 29-33.  DOI: 10.16638/j.cnki.1671-7988.2023.02.006 Abstract ( )   PDF (4065KB) ( )   In order to realize the purpose of low-energy and high-performance heat dissipation of battery pack thermal management system, this paper studied the battery pack thermal management system of a plug-in hybrid electric vehicle (PHEV) by computational fluid dynamics (CFD) simulation and experiment to optimize the research. The battery pack thermal management system adopts liquid cooling, and the design target of pressure loss is 27 kPa. For initial plan, the measured value of pressure loss is about 60 kPa, and CFD simulation analysis indicated that inlet and outlet of cooling system were key parts for pressure loss. Liquid cooling system was optimized by enlargement pipe diameter for inlet and outlet, simulation and experiment results showed that the pressure loss of the optimized liquid cooling system is reduced to about 26 kPa. After the flow field optimization of the liquid cooling system, results showed that the maximum temperature of battery pack under 67.6 kW was 53.2 ℃, which is lower than target 55 ℃. Comprehensive analysis can conclude that optimized indicators of the battery pack liquid cooling system reach the target state. References | Related Articles | Metrics

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Low State of Charge Risk Prediction of Power Battery REN Chao 2022, 48(2): 34-38.  DOI: 10.16638/j.cnki.1671-7988.2023.02.007 Abstract ( )   PDF (737KB) ( )   The traditional state of charge (SOC) prediction of power batteries is carried out under ideal experimental conditions, which may not be able to adapt to the real complex and changeable driving conditions. This work relies on the national big data alliance for new energy vehicles, using a data-driven approach, using real driving data to predict the current SOC of power batteries. The power battery type used in this paper is lithium iron phosphate battery, the alarm group and the prediction group are designed, and the logistic regression algorithm is used to extract the battery characteristic information of the low residual power SOC, and the model is trained, and the trained model is used to predict. The results show that the proposed model has high accuracy for low SOC diagnosis. References | Related Articles | Metrics

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Design of Electric Vehicle Heat-Recovery Heat Pump Air Conditioner System MA Xiaochao 2022, 48(2): 39-45.  DOI: 10.16638/j.cnki.1671-7988.2023.02.008 Abstract ( )   PDF (1847KB) ( )   In order to widen the operating range in low-temperature of the heat pump airconditioning system and improve the thermal efficiency of the heat pump air-conditioning system further, this paper presents a heat pump air conditioning system with the function of waste heat recovery, which is based on the ordinary heat pump air-conditioning in mass production. This paper analyzes the system working principles in detail, and designs the technical scheme of the system with the heat pump air-conditioning compressor, the waste heat recovery exchanger, the electromagnetic valve and the electronic expansion valve as the main parts. The emphasis is put on the three important working modes of the waste heat recovery, including the waste heat of the motor recovery, the waste heat of the motor and the battery recovery, and the waste heat of the air recovery. Aiming at the electronic expansion valve which is the core part of the system, a proportion integration differentiation (PID) control method based on the exhaust target temperature is developed, which can improve 40% of the thermal efficiency compared to the ordinary heat pump air-conditioning without waste heat recovery. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Multi-sensor Fusion Strategy of Intelligent Vehicle SONG Jiaohua 2022, 48(2): 46-50.  DOI: 10.16638/j.cnki.1671-7988.2023.02.009 Abstract ( )   PDF (1555KB) ( )   The traditional research of vehicle autonomous lane changing is based on the ideal road curvature and simplified vehicle motion, the vehicle path data are directly transmitted to the controller by matching the sampling period, which is difficult to verify the reliability of the system in the real environment. This paper designs a multi-sensor layout scheme and fusion strategy, and constructs the highway simulation scene on the Matlab/Simulink platform to verify the effectiveness of the multi- sensor fusion strategy. The simulation results show that the multi-sensor fusion strategy can realize the continuous tracking of the target vehicle in the high-speed scene, simulate the environmental perception and data fusion process of intelligent vehicles, and then provide technical reference for the development of intelligent vehicle autonomous lane changing system. References | Related Articles | Metrics

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Online Driver Intention Recognition Based on CRF LI Xuehan 2022, 48(2): 51-61.  DOI: 10.16638/j.cnki.1671-7988.2023.02.010 Abstract ( )   PDF (3530KB) ( )   In order to improve the decision-making accuracy of driving assistance system, this paper establishes an online driver intention recognition system based on conditional random field (CRF), which provides an important reference for driving assistance system. In this paper, deep label distribution learning (DLDL) is used to recognize the head posture of drivers to judge their observation targets. Experimental scenes are created on the driving simulator. The driver operation data are collected, divided according to the operation and input to CRF for training, and drivers' intention to change lanes is recognized. Through experimental comparison, the recognition rate is above 96%, and the driver's lane change intention can be recognized before 5 s. On this basis, online recognition is realized to meet the practical application requirements. References | Related Articles | Metrics

Design and Research

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Simulation and Optimization of Double-arm front suspension Based on ADAMS/Insight KANG Xuezhong 2022, 48(2): 62-66.  DOI: 10.16638/j.cnki.1671-7988.2023.02.011 Abstract ( )   PDF (1240KB) ( )   The double-arm front suspension of a passenger car is taken as the research object, the multi-body dynamics virtual prototype model is established in ADAMS/Car module, the dual-wheel parallel runout simulation is carried out on the model, the suspension parameters are optimized by ADAMS/Insight, and 8 hard point coordinates which have a great impact on the suspension performance are selected as the design variables. Five main suspension performance parameters (wheel front beam, etc.) are selected as optimization objectives, sensitivity analysis is carried out on the design variables, In Adams/Insight, a D-optimal optimization algorithm based on secondorder response surface method is selected for multi-objective optimization, and the optimized hard point coordinate values are obtained. The results show that the performance parameters of the optimized double-arm front suspension are greatly optimized, which has certain reference significance for the optimization design of double-arm front suspension in engineering. References | Related Articles | Metrics

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Improvement of Assembly Qualification Rate of a Heavy-duty Vehicle GUO Jiali 2022, 48(2): 67-71.  DOI: 10.16638/j.cnki.1671-7988.2023.02.012 Abstract ( )   PDF (2896KB) ( )   Vehicle assembly is the key link to realize product characteristics, and the quality level of the assembly process is directly related to the quality of vehicle products. The article mainly aims at the problem of unqualified assembly process of a heavy-duty vehicle. Through statistical analysis of data and field experiments, the main reasons for the unqualified assembly of the whole vehicle are found, and improvement measures are proposed. Through tracking and analyzing the improvement measures, the first time quality rate of vehicles has been significantly improved, and the improvement effect is good. References | Related Articles | Metrics

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Structure Design and Simulation Analysis of Muffler PENG Changqing 2022, 48(2): 72-78.  DOI: 10.16638/j.cnki.1671-7988.2023.02.013 Abstract ( )   PDF (2476KB) ( )   Automobile muffler is the most important part in reducing automobile noise pollution. It plays an important role in passenger comfort, environmental protection. This paper first analyzes the basic equations of acoustic wave movement in air, and the muffler is modeled in 3D by CATIA software. Then, virtual. lab software is used to solve the sound field in the muffler cavity by finite element method. And the sound pressure distribution in the sound field inside the muffler and the sound transfer loss performance of the muffler are obtained. Finally, the improvement measures of muffler structure are proposed according to the simulation results, and the back pressure experimental test of the muffler is also carried out. It provides theoretical basis and reference for muffler structure design. References | Related Articles | Metrics

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Research on Evaluation Method of Heavy Commercial Vehicle Product Competitiveness in Segmented Market QIU Ming’an 2022, 48(2): 79-82.  DOI: 10.16638/j.cnki.1671-7988.2023.02.014 Abstract ( )   PDF (978KB) ( )   The product competitiveness level of heavy commercial vehicles is not only related to the products themselves, but also closely related to the customer demand of market segments and the level of similar products. Based on the customer demand of market segments, this paper sets up a product competitiveness evaluation index system from the customer perspective, and establishes a competitiveness evaluation model and cannikin law correction method through analytic hierarchy process. This model can not only objectively and comprehensively quantifies the market competitiveness level of heavy commercial vehicles, but also provides a basis for enterprise product marketing strategy formulation, product improvement and technology optimization. References | Related Articles | Metrics

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Lightweight Design of Fender Assembly Structures of a Commercial Vehicle REN Wentao 2022, 48(2): 83-86.  DOI: 10.16638/j.cnki.1671-7988.2023.02.015 Abstract ( )   PDF (1180KB) ( )   In order to reduce the weight of commercial vehicles, taking the fender assembly of a commercial vehicle as the research object, using lightweight thinking, CATIA software is used to lightweight design the fender assembly of commercial vehicles.The three-dimensional finite element model of the fender structure is established, carry out strength analysis under typical working conditions (vertical working conditions and acceleration working conditions), and propose the replacement of structural materials, the local optimization design and the lightweight combination scheme of material thickness reduction have realized the lightweight of the fender and verified its strength performance, providing a theoretical basis for the subsequent research on the lightweight of the fender and even the whole vehicle. References | Related Articles | Metrics

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Design and Finite Element Analysis of Rolling Shutter Door Storage for Automobile PING Wei 2022, 48(2): 87-90.  DOI: 10.16638/j.cnki.1671-7988.2023.02.016 Abstract ( )   PDF (1184KB) ( )   As a common means of transportation in daily life, cars require more storage space. The rolling shutter door storage is a common structure of the interior trim, it adds a sense of grade to the car interior. This paper briefly introduces two common surface treatment processes of it, discusses some design points in the design process for two different rolling shutter door storage , and gives the corresponding physical experiment standards of rolling shutter door storage, in order to formulate corresponding standards for the design and development of it, so as to provide corresponding reference for the design and development of the corresponding structure of subsequent models. At the same time, in the design stage, in order to verify the rationality of the design of the rolling shutter door storage, the stiffness analysis is carried out through the finite element analysis software HyperMesh and ABAQUS, combined with the enterprise's analysis standards and qualified basis. The analysis results show that the stiffness of the rolling shutter door storage designed with reference to the design points meets the requirements of the design specifications, avoid the mold modify cost caused by insufficient rigidity of produced products. References | Related Articles | Metrics

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Durability Optimization Design of Rear Tie Rod Bushing of a Vehicle ZHANG Xiangyang 2022, 48(2): 91-94.  DOI: 10.16638/j.cnki.1671-7988.2023.02.017 Abstract ( )   PDF (1656KB) ( )   After a car pull rod bushing in bench test phase main root crack, and the outer tube crack of vulcanized rubber degum, limit block root failure phenomena. By analyzing the cracking of the failure parts, the key factors affecting the durability, such as the thickness of the lining coating, the structure of the main reinforcement, the shape of the limit block and the change of the hardness of the rubber material, were optimized. The finite element analysis method was used to verify the consistency between the strain concentration position and the actual fracture position. The damage coefficient derived from the optimized structure met the durability requirements, the durability of the actual bench test was qualified, and the customer passed the road test in the later stage. References | Related Articles | Metrics

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Load Design Method Based on Vehicle Suspension CHENG Kai 2022, 48(2): 95-100.  DOI: 10.16638/j.cnki.1671-7988.2023.02.018 Abstract ( )   PDF (1480KB) ( )   Lightweight design of automobile has always been the ultimate goal pursued by major Original equipment manufacturers (OEMs). Especially in recent years, with the development of new energy vehicles, the market has higher and higher requirements for endurance capacity, and the weight of the whole vehicle is related to the endurance, so lightweight design is particularly important. The source of lightweight design is the load design of suspension. Based on a multi-link rear suspension structure, this paper proposes a load design method. Its main idea is to comprehensively consider the load distribution and kinematic compliance (KC) performance of the suspension, and seek the best distribution of hard points through design of experiment (DOE) and optimization method, achieve the purpose of reducing suspension load, so as to lay a good foundation for the lightweight design of the structure. References | Related Articles | Metrics

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Lateral and Longitudinal Control of Intelligent Vehicle Based on Adaptive LQR LI Zhiyuan 2022, 48(2): 101-107.  DOI: 10.16638/j.cnki.1671-7988.2023.02.019 Abstract ( )   PDF (1483KB) ( )   Considering the vehicle understeer, an adaptive linear quadratic regulato (LQR) control algorithm with feedforward is proposed to accomplish lane change in lateral and longitudinal control of automatic driving. Firstly, the longitudinal dual proportion integration differentiation (PID) controller is built by making the throttle brake meter. Then, the LQR lateral controller is designed based on the two-degree of freedom dynamic model of the vehicle with path tracking error, and the feedforward feedback method is used to give the vehicle an extra corner to eliminate the steady-state error. Then, by analyzing the parameters of LOR controller and considering the two key evaluation indexes of vehicle, such as stability and ride comfort, a weight parameter calculation method considering path curvature and path tracking error is proposed, so as to ensure the vehicle trajectory tracking error within a certain range. Finally, the adaptive LQR controller is effective by MATLAB/Simulink and CarSim co-simulation. The results suggest that the controller can accurately track the lane change path with a maximum lateral error of 0.027 m and a maximum heading error of 0.041 rad. References | Related Articles | Metrics

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Design of Size Measurement System for Automobile Lamp Holder Based on Machine Vision ZENG Wenzhi 2022, 48(2): 108-113.  DOI: 10.16638/j.cnki.1671-7988.2023.02.020 Abstract ( )   PDF (1774KB) ( )   In order to realize the dimensional inspection requirements of the ultrasonic welding machine to the lamp holder after welding, a set of dimensional inspection system based on machine vision is designed. An improved Canny algorithm is proposed to extract image edges, and it is applied to line segment detector (LSD) algorithm to extract straight line segments. Through comparing the measurement results of the detection system in this paper with the standard size, the accuracy of the detection system in this paper is increased by 7%, and the speed is doubled. The size detection system designed based on the improved algorithm effectively improves the detection accuracy and efficiency, and has certain application value in industry. References | Related Articles | Metrics

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Specific implementation method and modeling idea of CATIA IMA in Automobile Styling ZHAO Jin 2022, 48(2): 114-117.  DOI: 10.16638/j.cnki.1671-7988.2023.02.021 Abstract ( )   PDF (2046KB) ( )   With the application of "Fast modeling" technology based on subdivision in the field of automobile styling by global automobile enterprises, more and more automobile styling practitioners begin to learn and study this new modeling technology. This paper will start with the advantages and disadvantages of subdivision modeling compared with the traditional non-uniform rational b-splines (NURBS) modeling, briefly describe the significance of subdivision modeling and its application stage. Then briefly introduce the CATIA IMA (Image&Shape) module and its common commands. Finally, a larger space is used to descrcribe the specific implementation methods, modeling ideas and skills of "fast modeling" based on CATIA IMA, it is intended to enable the relevant practitioners to quickly understand, master and apply this new technology. References | Related Articles | Metrics

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Failure Mechanism Analysis of Hydraulic Power Assist in Steering System of a Certain Vehicle CHEN Yifeng 2022, 48(2): 118-121.  DOI: 10.16638/j.cnki.1671-7988.2023.02.022 Abstract ( )   PDF (1923KB) ( )   The steering heavy caused by steering system failure of automobile hydraulic power assist is a common fault in the automobile industry. There are many reasons for the failure of hydraulic power assist in steering system. Based on the case of the failure of hydraulic power assist in steering system of a certain vehicle, the paper analyzes the size, performance, structure, working principle of the valve system and so on for steering pump. The bench test and vehicle test are used to confirm the fault key factors and verify the effectiveness of the improvement scheme. This paper analyzes the failure of hydraulic steering system and provides a reference analysis method for similar engineering problems in the future. References | Related Articles | Metrics

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Analysis on Driver's Driving Attitude Comfort Based on Chinese Human Body Size HUO Canjian 2022, 48(2): 122-130.  DOI: 10.16638/j.cnki.1671-7988.2023.02.023 Abstract ( )   PDF (2528KB) ( )   In order to establish a driver's comfortable sitting posture model based on the size of the Chinese human body and improve the driver's driving comfort, this paper selects different driving seat heights, collects the driver's comfortable driving posture, and fits the driver's driving H point and the positional relationship between the steering wheel and the pedal points. The comfortable driving sitting posture models of men, women, and men and women are obtained, and the design values of the seat position and steering wheel position corresponding to various seat heights are given, which has certain guiding significance for the driver's driving comfort design. References | Related Articles | Metrics

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Design of On-board Bearing Vibration Monitoring System Based on LabVIEW LI Xiaoyang 2022, 48(2): 131-134.  DOI: 10.16638/j.cnki.1671-7988.2023.02.024 Abstract ( )   PDF (1513KB) ( )   At present, the working environment of most vehicle bearings is harsh, and the bearings are prone to various forms of failures. In this paper, a bearing fault diagnosis method based on vibration analysis is proposed. With the help of the LabVIEW software platform, a set of on-board bearing vibration monitoring system is designed by taking the transmission rolling bearing as an example. The system can keep the bearings in good working condition, and replace the bearings in time after the failure occurs to ensure the stability, safety and reliability of the vehicle operation, and conduct real-time condition monitoring and fault diagnosis for some vehicle bearings. It is of great significance to promote the development of intelligent diagnostic systems incorporating deep learning. References | Related Articles | Metrics

Testing and Experiment

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Simulation Study on the Effect of Humidification on the Performance of PEMFC CHEN Jundong 2022, 48(2): 135-140.  DOI: 10.16638/j.cnki.1671-7988.2023.02.025 Abstract ( )   PDF (1984KB) ( )   At present, proton exchange membrane fuel cell (PEMFC) is one of the hot research topics in the fuel cell field. Previous studies have shown that the water content in the electrolyte membrane plays an important role in the normal operation of PEMFC. Therefore, this paper will build a PEMFC model on the Matlab/Simulink software platform to explore the influence of reaction gas humidification on the performance of fuel cells. Simulation results show that the anode humidification, reaction gas humidity from 20% to 100%, the output voltage of the battery increases, and the current density increases, the voltage can be further improved. Cathode humidification can also improve the output voltage, when the humidity increases from 20% to 60%, the voltage increase is obvious. The increase of humidity in the reaction gas will lead to a decrease in the partial pressure of the reaction gas, especially for the partial pressure of hydrogen, when the relative humidity rises from 60% to 100%, it will significantly decrease. As for oxygen partial pressure, the decline is most pronounced when relative humidity rises from 60% to 80%. According to the results, humidification helps to improve the PEMFC working environment, improve the output characteristics, and facilitate the operation of PEMFC. References | Related Articles | Metrics

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Analysis and Improvement of Abnormal Driving of a Certain Type of Construction Vehicles LU Yigang 2022, 48(2): 141-146.  DOI: 10.16638/j.cnki.1671-7988.2023.02.026 Abstract ( )   PDF (1847KB) ( )   In the process of delivery test of a certain type of truck, the phenomenon of abnormal driving and high oil temperature of gearbox appeared. The characteristics include: when driving about 20～50 kilometers, the phenomenon of walking acceleration and deceleration appears when stepping on the accelerator, and the situation of low pressure and high oil temperature of gearbox alarm successively appears. In view of this phenomenon, the disassembly inspection is carried out and the fault tree analysis and mechanism calculation and analysis are used. It is concluded that the drop of pressure is not considered in the pressure monitoring point, which leads to this phenomenon. Through the fault recurrence, the main engine is repaired and the shifting pressure was adjusted. Finally, the problem is verified to be solved. References | Related Articles | Metrics

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Development of Active Road Noise Reduction System for a Vehicle WANG Lizhou 2022, 48(2): 147-151.  DOI: 10.16638/j.cnki.1671-7988.2023.02.027 Abstract ( )   PDF (1409KB) ( )   Using the active noise control method to reduce the road noise in vehicle is a cutting-edge approach, but there are few practical cases and available experience for reference. The road noise active control system based on normalized filter-x least mean square (NFxLMS) algorithm is developed in this paper, the algorithm principle of the multi-channel input and multi-channel output of the noise reduction control system, and the secondary path modeling are described. The Simulink model is built based on this algorithm, and dSPACE is used as the real-time controller to build a vehicle test platform based on the algorithm. The road test of demo car shows that the system has a good effect on vehicle interior road noise reduction. Finally, an unstable working condition problem of the normalized filter-x least mean square (FxLMS) algorithm is analyzed and the solution is proposed. References | Related Articles | Metrics

Process and Equipment

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Traceability Curve Application in Tighten Problem Analysis LIU Lianggang 2022, 48(2): 152-156.  DOI: 10.16638/j.cnki.1671-7988.2023.02.028 Abstract ( )   PDF (1214KB) ( )   With rapid progress of industry, kinds of alternative joints technology become used. However, bolts fastener joint is one of mostly used joint technology. Bolt joint failure analysis is based failure itself by theory and actual principle before. Several typical curves samples like bolt fracture, over tightened, re-tighten, lost tighten are collected and analyzed from typical bolt joint failure cases firstly. Besides, the analysis of the tightening curves, combines with further systematic investigation and cross-checking of the process thread bore diameter, bolt hardness and operating practices further systematic investigation and cross-checking other influence factors in manufacture are further investigated, it shows the importance of traceability curve. With this article’s introduction, offer a brand new perspective to help more efficient investigate and solve the tighten issues on assembly line. References | Related Articles | Metrics

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Air Tightness Analysis and Optimization of a SUV BIW LI Rongxi 2022, 48(2): 157-160.  DOI: 10.16638/j.cnki.1671-7988.2023.02.029 Abstract ( )   PDF (1726KB) ( )   In this paper, the air tightness of the whole vehicle and body in white (BIW) of a certain sport utility vehicle (SUV) is tested, and the leakageMaster leakage path simulation analysis software is used to simulate and analyze the BIW of this model, and the main leakage points of the BIW of this model are found out. Then, combined with the results of the BIW smoke test, relevant sealing measures are formulated for the main leakage points of the BIW, which finally makes the air tightness of the BIW meet the target requirements and improves the performance of the noise、vibration、 harshness (NVH) of the whole vehicle, thereby improving the ride comfort. References | Related Articles | Metrics

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Analysis on the Causes and Improvement Strategies of Car Door Baking Deformation LIU Lijie 2022, 48(2): 161-165.  DOI: 10.16638/j.cnki.1671-7988.2023.02.030 Abstract ( )   PDF (2990KB) ( )   The baking deformation of door spraying process has always been a complex and difficult problem in the industry. In order to solve this problem, this paper puts forward the effective improvement countermeasures. Taking a vehicle door assembly as an example, through physical verification test, 3D measurement and other methods, the change of geometric dimension of the spraying process is tracked and the baking deformation law is studied. Then, the reasons of baking deformation are analyzed from the design structure and manufacturing process of door such as door inner plate, door guide rail, hinge nut plate and so on. In the early design stage, it is proposed to adopt the welding processes such as door inner plate welding, unilateral spot welding after door assembly edging, and separating spot welding between door hinge reinforcing plate and guide rail. In the stage of vehicle industrialization commissioning, it is proposed to correct the door welding fixture and adjust the hinge nut plate to compensate the baking deformation. By the real vehicle verification, this research result improves the appearance gap flush, which is of great significance to improve the perceived quality level of the whole vehicle and reduce customer complaints. At the same time, it also provides a reference for the improvement of baking deformation of tailgate, hood and other opening and closing parts. References | Related Articles | Metrics

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Analysis on the Development of Automobile Plastic Electroplating Parts LIU Jian 2022, 48(2): 166-169.  DOI: 10.16638/j.cnki.1671-7988.2023.02.031 Abstract ( )   PDF (999KB) ( )   On the basis of the development and research of automotive plastic electroplating parts, this paper puts forward the development and verification methods of the whole process in four directions, including material development, manufacturing process, structural design, experimental evaluation. In the material development, the basic material properties of material and design requirements of material formula are analyzed. In the manufacturing process, the process requirements such as injection molding and electroplating parameters of parts are clarified. In the structural design, the common requirements for parts and the special requirements for each type of part are described. In the experimental evaluation, the evaluation methods of rough appearance, adhesion force, hot and cold impact are proposed. The development process method of whole process provides a reference for the development of automotive electroplating parts and ensures the reliability of automotive electroplating parts. References | Related Articles | Metrics

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Research and Development and Testing of New Energy Dual-core Shielded Ring Harness Equipment ZUO Erbing 2022, 48(2): 170-174.  DOI: 10.16638/j.cnki.1671-7988.2023.02.032 Abstract ( )   PDF (5023KB) ( )   Aiming at a common dual-core shielding ring structure in the new energy harness, a customized device that can independently complete automatic branching, automatic peeling and zero cutting, double terminal continuous crimping and other processes has been developed. The overall structure includes the frame, 4T crimping machine, branching positioning mechanism, waste cutting mechanism, electric cylinder cutter assembly, lever double wire grasping mechanism and translation mechanism. Detect the crimping machine stability machine capability index (CMK), the consistency of the total length of the harness, the analysis of the terminal profile, the drawing force of the harness and the terminal and other data, and make statistics of the measurement data to verify the advantages of good crimping stability of the equipment and high product quality, which meet the technological requirements of new energy harness and have a wide range of market applications. References | Related Articles | Metrics

Automobile Education

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Exploration of Blended Teaching Mode Based on OBE in Automobile Structure WANG Xuelian 2022, 48(2): 175-179.  DOI: 10.16638/j.cnki.1671-7988.2023.02.033 Abstract ( )   PDF (1000KB) ( )   In the era of “Internet +”, China is constantly implementing education reform. In this context, in view of the problems existing in the current teaching of automobile structure, the blended teaching mode is implemented by introducing the concept of outcome based education (OBE), so as to improve the teaching effect of the course and the professional level and comprehensive quality of students. This paper starts with the analysis of students abilities that they should have after learning through the course of automobile structure. In line with the principles of positive implementation and reverse design, it designs novel teaching activities from the aspects of teaching objectives, teaching content, teaching implementation forms and curriculum assessment methods. It uses experiential teaching methods to construct two modules of theory and practice, and explores the online and offline blended teaching curriculum reform mode. Through exploration and application in practice, it fully embodies the dominant position of students learning, achieves better teaching effect, enhances the practical operation ability of students, and has certain reference significance for the exploration and practice of curriculum reform. References | Related Articles | Metrics

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Teaching Reform of New Energy Vehicle Technology from the Perspective of Curriculum Ideology and Politics XIANG Jin 2022, 48(2): 180-183.  DOI: 10.16638/j.cnki.1671-7988.2023.02.034 Abstract ( )   PDF (1059KB) ( )   In order to better integrate the elements of ideological and political education into professional courses, starting from the necessity and importance of the ideological and political teaching reform of the new energy vehicle technology course, the ideological and political teaching reform of new energy vehicle technology professional courses is carried out. By analyzing the nature of the course and the importance of the course in the automotive service engineering profession, taking the characteristics of college students as the starting point, it is proposed that teachers should strengthen their own moral quality, establish professional teaching teams, deeply tap the ideological and political elements of this course, establish a teaching syllabus incorporating the ideological and political elements of the curriculum, and carry out teaching reform through the teaching design integrating ideological and political elements, so that students can imperceptibly accept ideological and political education in the process of learning professional knowledge, establish a correct outlook on values, life and career, practice the educational concept of ideological and political education, and strengthen the educational concept of establishing virtue and cultivating people. The results show that the course after the integration of ideological and political education elements has achieved a high satisfaction, which has played a better role in promoting the improvement of students' overall quality. References | Related Articles | Metrics

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The Evaluation System of Ideological and Political Teaching of Automobile Theory from Multiple Perspectives XU Sha 2022, 48(2): 184-187.  DOI: 10.16638/j.cnki.1671-7988.2023.02.035 Abstract ( )   PDF (1138KB) ( )   In order to improve the ideological and political teaching level and investigate the effect of the implementation of the ideological and political teaching of the automobile theory, this paper takes automobile theory as the key course of vehicle engineering, studies the evaluation system of the ideological and political teaching of the automobile theory. According to the objectives of the ideological and political teaching of the course, in view of the problems existing in the evaluation of the ideological and political teaching at present, discusses the idea of constructing the evaluation system, and studies the evaluation indicators of the ideological and political teaching of the course from a multi-perspective. The research on the evaluation system of Ideological and political education can promote the reform of ideological and political education and improve the quality of Ideological and political education. References | Related Articles | Metrics

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Practice of Curriculum Reform of Electric Vehicle Structure and Maintenance in Vocational Education under the Background of Integration of Industry and Education XU Zengyong 2022, 48(2): 188-193.  DOI: 10.16638/j.cnki.1671-7988.2023.02.036 Abstract ( )   PDF (1539KB) ( )   With the deepening of the integration of production and education, the curriculum reform of vocational education has great significance to the training of high-quality technical talents. The curriculum teaching reform of the new energy automobile major in vocational colleges must be guided by the transformation and upgrading of the new energy automobile industry, integrate the rich resources of school enterprise cooperation with the curriculum teaching deeply, and realize the seamless connection between the talent demand of the industrial transformation and the training of high skilled technical talents. Taking the course of "Electric Vehicle Structure and Maintenance" as an example, this paper analyzes the necessity of implementing the curriculum reform under the background of integration of production and education, and puts forward the basic ideas of curriculum reform. From the five aspects of curriculum content reconstruction, threedimensional teaching resource construction, teaching mode innovation, curriculum ideological and political system construction, and evaluation method optimization, carry out the curriculum reform and practice of integration of industry and education, realize the integration of job-coursecompetition-certificate, promote the establishment of a new era school enterprise in-depth integration and collaborative education mechanism, and realize the fundamental task of "building morality and cultivating people". References | Related Articles | Metrics

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Development of Particulate Measurement Technology for Automobile Engine Exhaust ZHAO Liang 2022, 48(2): 194-199.  DOI: 10.16638/j.cnki.1671-7988.2023.02.037 Abstract ( )   PDF (2282KB) ( )   Particulate matter from automobile engine exhaust is one of the main sources of air pollution, with high emission concentration and great harm to the environment. Accurate measurement of particulate matter is an important prerequisite for engine emission detection and post-treatment evaluation. Emission standards promote the continuous innovation and application of engine emission control technology, and also promote the development of exhaust particulate measurement technology. At present, the measurement of particulate matter in engine exhaust has shifted from the rough smoke measurement in the past to the more accurate measurement of particulate matter (PM) quality and particle number (PN). The Europe 7 proposal puts forward requirements for the measurement of the quantity of 10 nm ultra-fine particles; The measurement mode is also developing from fixed point and quantitative measurement to online continuous measurement. In this paper, the development of measurement technology for particulate matter in automotive engine exhaust is reviewed. The principle, characteristics and application of several main measurement technology instruments are introduced in terms of smoke, particulate matter quality and particle number, and the future development of non exhaust particulate matter measurement technology is prospected. References | Related Articles | Metrics

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Current Situation and Development Strategy of Hydrogen Fuel Cell Vehicles in China LI Zhiqiang 2022, 48(2): 200-204.  DOI: 10.16638/j.cnki.1671-7988.2023.02.038 Abstract ( )   PDF (1201KB) ( )   With the characteristics of zero pollution and zero noise, hydrogen fuel cell vehicles are highly valued by the society. At present, the production of hydrogen fuel cell vehicles is increasing, and the government has issued relevant supporting policies. Hydrogen fuel cell vehicles have a promising prospect, but it is also affected by the imperfect industrial chain, high battery production cost, and backward hydrogen energy infrastructure. Based on this, this paper uses literature analysis to analyze the current market situation and industrial policies of domestic hydrogen fuel cell vehicles, and puts forward reasonable strategies for the further development of hydrogen fuel cell vehicles, such as improving the industrial chain of hydrogen fuel cell vehicles, strengthening R&D investment, reducing battery cost, strengthening policy guidance, and promoting the construction of hydrogen energy infrastructure. It will be a reference for the development of the hydrogen fuel cell vehicle industry, but also a guidance for the development trend of the automobile industry. References | Related Articles | Metrics