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15 December 2022, Volume 47 Issue 23 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Thermal Spread Analysis of Lithium Battery Based on Fluent Thermal Abuse Model QIAO Shijie 2022, 47(23): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2022.023.001 Abstract ( )   PDF (869KB) ( )   To further understand the internal micro mechanism of battery thermal runaway, based on Fluent, this paper adopts the coupling method of ECM-thermal abuse model and numerical simulation method to study the thermal runaway spreading phenomenon of lithium battery under heating condition. The thermal runaway spread temperature field, thermal abuse reaction and heat production rate of lithium battery were analyzed. The results show that the temperature rise curve of battery thermal runaway has the same trend, and the reaction of anode and cathode with electrolyte is the key factor leading to the temperature rise of battery, which provides a reference for the safety design of battery thermal runaway. References | Related Articles | Metrics

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Analysis on Performance Simulation of Permanent Magnet Synchronous Motor for Pure Electric Heavy Truck YANG Ning 2022, 47(23): 5-11.  DOI: 10.16638/j.cnki.1671-7988.2022.023.002 Abstract ( )   PDF (1656KB) ( )   In order to further improve the output performance of permanent magnet synchronous motor for pure electric heavy truck, the electromagnetic simulation model of Motor-CAD motor was established according to the designed preliminary electromagnetic scheme. The magneto-thermal coupling simulation was carried out through E-mag module and Terminal module, and the whole working condition area was simulated by Lab module. On the basis of theoretical analysis, the influence of the motor rotor pole structure, the stator groove structure and the split ratio on the output torque performance was simulated. The loss of the motor under different currents and different heat dissipation conditions was calculated. Finally, the optimization measures of the motor electromagnetic torque and the motor loss rule were obtained. References | Related Articles | Metrics

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Research Analysis and Optimization of Electric Vehicle Range WANG Jin 2022, 47(23): 12-18.  DOI: 10.16638/j.cnki.1671-7988.2022.023.003 Abstract ( )   PDF (937KB) ( )   At present, the range of electric vehicles is affected by many factors. Firstly, this paper analyzes which external factors will affect the range and the specific reasons, and then establishes the relevant mathematical theoretical formula. Through the simulation of Matlab, the curve is obtained for analysis. It is concluded that the main factors affecting the range are windward area, system efficiency, body weight, rolling resistance, battery capacity and air resistance. According to the results of the above factors, the optimization analysis is carried out to maximize the range of electric vehicles, and provide feasible suggestions. References | Related Articles | Metrics

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Control System and Strategy of Braking Energy Recovery for Electric Vehicle GE Liuqin 2022, 47(23): 19-24.  DOI: 10.16638/j.cnki.1671-7988.2022.023.004 Abstract ( )   PDF (2169KB) ( )   As for the electric vehicle, the design of its braking system must be adapted to the requirements of energy recovery. Based on the research toward brake-by-wire system products on the market, a kind of new electronic brake booster is designed in this article. Then, a control system of braking energy recovery for electric vehicles is constructed, which includes the electronic brake booster, vehicle controller, battery management system, motor controller, antilock brake system (ABS) or electronic stability controller (ESC). A control strategy model of braking energy recovery is built in Matlab/Simulink software, with the target braking force, battery state of charge (SOC), vehicle speed, and motor parameters taken as input variables, and the target hydraulic braking force and target motor braking force taken as output variables. Furthermore, the control strategy is evaluated by simulation of Matlab/Simulink and AVL Cruise, and a good energy recovery performance is exhibited on the electric vehicle with the control strategy. Under the new european driving cycle (NEDC) working condition, the energy recovery rate reaches 12.8% and the driving range is increased by 15%. Through the study of this paper, a meaningful guidance can be provided for the development of brake-by-wire system and energy recovery control system of electric vehicles. References | Related Articles | Metrics

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Analysis of Adaptive Energy Recovery Control for Electric Vehicles WANG Chunsheng 2022, 47(23): 25-28.  DOI: 10.16638/j.cnki.1671-7988.2022.023.005 Abstract ( )   PDF (725KB) ( )   Research on adaptive energy recovery control of electric vehicles a strategy to improve driving performance and energy recovery efficiency is studied for the energy recovery condition of electric vehicles. Firstly, a model to estimate the vehicle weight is established based on the vehicle dynamics model. In the coasting condition, different feedback torque coefficients are determined according to the vehicle weight and road slope to determine the final target coasting feedback torque. In the braking condition, the target deceleration is determined according to the braking depth, and then the brake feedback torque coefficient is determined according to the estimated vehicle weight and target deceleration to determine the final brake feedback target torque, and then the hydraulic braking and electric braking are distributed according to the vehicle capacity. Through the comparison and verification of real vehicles, it not only improves the driving performance, but also improves the energy recovery rate to a certain extent and saves electricity. References | Related Articles | Metrics

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Analysis of CAN Signal Based on Similarity Principle FAN Jinna 2022, 47(23): 29-33.  DOI: 10.16638/j.cnki.1671-7988.2022.023.006 Abstract ( )   PDF (1091KB) ( )   With the development of new energy vehicles, it has become an important means to acquire experimental analysis data by collecting controller area network (CAN) bus signal in vehicle benchmarking test. CAN bus protocol is a confidential document for the vehicle manufacturer, so it is necessary to research a method to reverse crack the CAN bus signal of the vehicle. The research on CAN signal analysis method based on similarity principle is to use mathematical algorithm to realize signal positioning in the bus report by covering the typical features of some signals under specific conditions and then covering the common features of different vehicles. This method saves the time of manual processing a large number of CAN bus data, filters out the ID of the signal quickly and effectively, and realizes the cracking of the CAN bus signal of the vehicle. Aiming at the reverse cracking of vehicle can bus signal, this paper proposes to quickly locate the position of the required signal in the bus message through the similarity principle and algorithm screening, so as to reverse analyze the required signal. The results show that this method can quickly crack most can signals in vehicle benchmarking, and improve the accuracy and efficiency of analysis. References | Related Articles | Metrics

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Energy Management Strategy of Plug-in Hybrid Electric Bus Based on Model Predictive Control WANG Leyan 2022, 47(23): 34-38.  DOI: 10.16638/j.cnki.1671-7988.2022.023.007 Abstract ( )   PDF (1689KB) ( )   A series plug-in hybrid city bus is used to optimize control sequence of the powertrain system with the goal of minimizing energy consumption based on model predictive control (MPC) energy management strategy, which can be applied in real time. Firstly, a single and a multi-step speed prediction model based on Markov chain is established according to the historical speed and acceleration. The dynamic programming (DP) algorithm was used to obtain the optimal control sequence of the dynamical system. Finally, the energy management strategies based on model predictive control (MPC), DP and PMP are compared. The results show that the proposed MPC can achieve the control effect similar to the global optimization algorithm and can be applied to real time control, which is not available in the other two methods. It reflects the superiority of this strategy. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Intelligent Vehicle Dynamic Obstacle Avoidance Trajectory Prediction and Tracking Control ZHAO Haipeng 2022, 47(23): 39-44.  DOI: 10.16638/j.cnki.1671-7988.2022.023.008 Abstract ( )   PDF (1229KB) ( )   To solve the problem of intelligent vehicle dynamic obstacle avoidance path prediction and tracking, dynamic obstacles are modeled and obstacle avoidance constraints are introduced based on the triangle area method, cost functions are designed to meet the optimal predicted trajectory output, and a nonlinear model predictive controller (NMPC) that introduces rollover constraints is designed to track the online optimal path. The Matlab performs the obstacle avoidance trajectory prediction and tracking control simulation under the structured road. The simulation test shows that the control vehicle can change lanes and reach the designated target point when meeting the obstacle avoidance constraint, and the jerk value is small and has good comfort. The test results show that the predicted trajectory is ideal, the controller has high accuracy and certain robustness. References | Related Articles | Metrics

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Vision-based Lane Keeping System ZHANG Hangcheng 2022, 47(23): 45-50.  DOI: 10.16638/j.cnki.1671-7988.2022.023.009 Abstract ( )   PDF (1254KB) ( )   In order to improve the active safety of unmanned vehicles, this paper adopts the lane keeping method based on neural network lane line detection and single point preview lateral control strategy. The on-board camera is used as the sensing device to collect the image information of the road ahead and transmit it to the on-board terminal to process the image and obtain the lane line information. Accordingly, the corresponding lateral controller is designed to calculate the front wheel Angle required to deviate from the lane center, which is finally transmitted to the vehicle control mechanism as a control signal to realize lane keeping. The test results show that the system can realize the lane keeping function at low speed. The research results have some reference value for improving the performance of lane keeping. References | Related Articles | Metrics

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Analysis of Intelligent Vehicle Driving Condition Monitoring System Based on Cloud Communication WANG Qichao 2022, 47(23): 51-55.  DOI: 10.16638/j.cnki.1671-7988.2022.023.010 Abstract ( )   PDF (1525KB) ( )   It is difficult to realize high-order autonomous driving only by relying on single-vehicle intelligence. However, the combination of vehicle, cloud, road and human can greatly improve the vehicle's environmental perception and control decision-making ability, so as to give the global optimal scheme in the process of intelligent vehicle driving. In this paper, a vehicle driving condition monitoring system based on cloud communication was built. Firstly, the on-board Robot Operating System (ROS) system was used to integrate the data of each sensor, then the data were uploaded to the cloud through WebSocket protocol and stored efficiently by Redis cache middleware in the cloud. The cloud system used Token-based security verification technology for secure access and data re-integration. The client requested monitoring data through the HTTP protocol and designed a display page for each monitoring data on the client. Finally, the corresponding sensors were deployed on the real vehicle to verify the monitoring system. The results showed that the system had good reliability and stability. References | Related Articles | Metrics

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Research of Vehicle Over-the-air Update Data System Based on Data Mining HU Changguo 2022, 47(23): 56-61.  DOI: 10.16638/j.cnki.1671-7988.2022.023.011 Abstract ( )   PDF (1071KB) ( )   In the context of software-defined vehicle, over-the-air (OTA) update has become an extremely important way for the intelligent connected vehicle technology improvement, performance services improvement and software sales ecosystem build. Based on mass vehicles over-the-air (OTA) update will generate tens of millions of vehicle data. With deep data mining of vehicle data generated by over-the-air update and big data governance and analysis, it will contribute to guide and optimize the design scheme and update strategy of vehicle over-the-air update. Meanwhile, the digital management level of enterprises can be improved. This paper constructed the data system of vehicle over-the-air update, realized the granular analysis and management of key technical parameters data and carries out the process risk warning. The development structure based on the big data development model of data mining technology and Hadoop open source platform.From the system application, the developed system can effectively improve the level of analysis, storage and intelligent deep analysis of massive data generated by OTA update. Meanwhile, it can contribute to monitor and trace the vehicle change during the whole over-the-air process. Furthermore, it will promote the closed-loop management of OTA update. References | Related Articles | Metrics

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Service-oriented Architecture Design Based on PREEvision ZHAN Dekai 2022, 47(23): 62-70.  DOI: 10.16638/j.cnki.1671-7988.2022.023.012 Abstract ( )   PDF (1068KB) ( )   With the in-depth development of the new "four modernizations" of automobiles, electronic and electrical systems are becoming more and more complex, and the innovation and expansion of electronic and electrical architecture is imperative. Service-oriented architecture (SOA), model based design (MBD), AutoSAR and Ethernet have become trends for development of the electronic and electrical architecture. The article describes how to realize the developing contents based on the PREEvision software for the service-oriented architecture design. The contents included service and service interface, software architecture, network topology, service deployment, Ethernet protocols, Ethernet SoAD module and SOMEIP serializer, etc. The ARXML files should be produced after building the module. The development process met the technical requirement of the MBD and AutoSAR. It promoted the realization of software-defined vehicles and formed and improved new electronic and electrical architecture platforms. References | Related Articles | Metrics

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Analysis of Lane Detection Algorithm Based on MobileNetV3 ZHU Bingbing 2022, 47(23): 71-76.  DOI: 10.16638/j.cnki.1671-7988.2022.023.013 Abstract ( )   PDF (2339KB) ( )   Lane detection is an important part of vehicle assisted driving. In order to realize detecting lane lines accurately and quickly, a lightweight lane detection algorithm based on MobileNetV3 network is proposed. Firstly, the deep separable convolution module of MobileNetV3 network is improved, and the spatial attention mechanism module is added on this basis. Then the lane lines are represented as third-order polynomials, and the lane lines features in the image are extracted by using the optimized MobileNetV3 network to obtain the lane lines parameters used to fit the third-order polynomials. Finally, a regression model of lane-line is constructed to improve the detection accuracy of lane lines by constantly revising the lane lines parameters. The experimental results on Tusimple lane dataset show that the proposed algorithm has a frame processing speed of 210 fps and a detection accuracy of 83.35 %. It can run in real time and has high detection accuracy. References | Related Articles | Metrics

Design and Research

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Design of All-wheel Interconnected Suspension System SHAN Weicong 2022, 47(23): 77-82.  DOI: 10.16638/j.cnki.1671-7988.2022.023.014 Abstract ( )   PDF (1126KB) ( )   In recent years, the automobile industry has developed rapidly. With the support of national strategic goals such as carbon neutralization and carbon peaking, electric vehicles are increasing. With the large capacity battery, the vehicle weight will increase while bringing long endurance, and the vehicle stability and comfort will decrease accordingly. The all-wheel interconnected suspension described in this paper studies how to improve the vehicle's driving stability and comfort. The damper of the whole vehicle is connected through the hydraulic pipeline, and the flow is controlled by the flow limiting valve. By identifying the driving attitude of the vehicle and the driver's intention, the pressure of the specific pipeline is adjusted, so as to improve the damping under specific circumstances, and reduce the vehicle's roll pitch without losing the vehicle's comfort, thereby enhancing the vehicle's stability and improving the vehicle's handling. References | Related Articles | Metrics

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Lightweight Topology Optimization Design of Arc Support Based on Inspire Software XIANG Guo 2022, 47(23): 83-87.  DOI: 10.16638/j.cnki.1671-7988.2022.023.015 Abstract ( )   PDF (1662KB) ( )   In this paper, Inspire software for the optimization and design of an arc support, mainly through the control variable method to explore the influence of different optimization scheme for curved support. Specially improved arc support frame structure, reduce material on both ends of the frame body, effectively solve the arc support raw material redundancy structure, lightweight significantly. For lightweight design provides a new train of thought and feasibility plan. References | Related Articles | Metrics

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Design of Pedestrian Protection System with Intelligent Bouncing of the Engine Canopy WANG Bo 2022, 47(23): 88-92.  DOI: 10.16638/j.cnki.1671-7988.2022.023.016 Abstract ( )   PDF (1847KB) ( )   In traffic accidents, pedestrians' heads hit hard spots under the engine canopy, causing many casualties. In view of this situation, the intelligent ejection device of the engine canopy designed by the system is composed of ultrasonic radar, engine canopy, front cover front rotating shaft, front axle switch lock, rear axle rotating shaft, rear axle switch lock, air spring and other parts. In the event of a pedestrian collision, the control system controls the rear axle switch lock to open, the front axle switch lock to close, and the air spring to bounce up the rear end of the engine canopy, which cushions the pedestrians from impacting, avoiding the pedestrian's head from hitting the hard point under the engine and reducing casualties. After the release of the air spring, it can be pressurized again, so that the engine canopy intelligent bounce device can be reused, the maintenance cost is low, the pedestrian distance is detected by ultrasonic radar, and the collision analysis is carried out in combination with the speed of the car, which can predict the collision in advance and play a more timely protection effect. References | Related Articles | Metrics

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Fast Self-learning Method of Commercial Vehicle AMT Vehicle Weight HOU Shengdong 2022, 47(23): 93-97.  DOI: 10.16638/j.cnki.1671-7988.2022.023.017 Abstract ( )   PDF (1135KB) ( )   The load of the vehicle is a very important control input for the shifting rule of heavy commercial vehicles. According to the dynamic load, the gear difference is corrected. This paper takes an automatic transmission (AMT) model as the research object, through the dynamic analysis of the launch process, a self learning method of vehicle mass in the starting process is proposed. The experimental results show that this method can quickly estimate the vehicle weight, and the accuracy meets the requirements of shifting. It solves the problem of poor driving performance in the first few shifts of the new driving cycle without load, and meets the driver’s needs. References | Related Articles | Metrics

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Design Requirement and Finite Element Analysis of a SUV Auxiliary Dashboard Double Side-opening Armrest with ABAQUS CHEN Binwen 2022, 47(23): 98-103.  DOI: 10.16638/j.cnki.1671-7988.2022.023.018 Abstract ( )   PDF (7135KB) ( )   This paper introduces two kinds of armrest with different opening modes, and emphatically expounds the design requirements and precautions of side-opening armrest in the process of design and development. The computer aided engineering (CAE) analysis method of the side-opening armrest is introduced by using the finite element analysis method to evaluate whether the rigidity and strength of the side-opening armrest of an automobile's console meet the engineering design requirements when it is closed and opened. Firstly, the 3D grid of the auxiliary dashboard of the car is divided through HyperMesh, and constraints and loads are imposed according to the company's specifications. Then, the analysis file is imported into ABAQUS analysis software for solution, and the displacement nephogram and stress nephogram of the side-opening armrest under four working conditions are analyzed. The analysis results show that the design of the armrest meets the requirements, It provides reference experience for the subsequent design and development of side-opening armrest and its CAE analysis and qualification judgment basis. References | Related Articles | Metrics

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The Brake Hose Routing Design Based on IPS XIE Taoxin 2022, 47(23): 104-108.  DOI: 10.16638/j.cnki.1671-7988.2022.023.019 Abstract ( )   PDF (3402KB) ( )   Due to the bending characteristics determined by the material, the minimum clearance requirements with surrounding parts on the vehicle, and the extreme motion trajectory of the suspension and steering system, etc., the automobile brake hose may meet dynamic and static interference, excessive involvement, excessive bending fatigue and other problems, which leads to hose wear, fatigue aging, brake fluid leakage, even the risk of brake failure. Through the structure and layout design check of the static end and the moving end of the brake hose based on IPS and three-dimensional software, the transformation of the bending path of the brake hose in the vehicle state to the straight pipe manufacturing of the brake hose in the production state was realized, and the reasonable design of the brake hose path was ensured to avoid the risk of brake failure caused by dynamic and static interference, excessive involvement and excessive bending. This will also form the design process of the brake hose and guide the robust routing design and optimization of the brake hose. References | Related Articles | Metrics

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Matching Design of a Pure Electric Vehicle Power System Based on AVL Cruise MIAO Mingya 2022, 47(23): 109-113.  DOI: 10.16638/j.cnki.1671-7988.2022.023.020 Abstract ( )   PDF (1553KB) ( )   The matching of the pure electric vehicle power system is the key in the development process of electric vehicles. The matching design of the power system of a pure electric vehicle is carried out. According to the design requirements, the parameters of the driving motor, driving scheme, transmission ratio, etc are matched. AVL Cruise software is used to model and simulate the whole vehicle, analyze the simulation results, and further determine the optimal transmission ratio scheme. The results show that the selected power system scheme meets the design requirements, and the transmission ratio scheme has better power performance and economy. References | Related Articles | Metrics

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Modal Analysis and Optimization of Front Door of Pickup Truck YU Daxiang 2022, 47(23): 114-117.  DOI: 10.16638/j.cnki.1671-7988.2022.023.021 Abstract ( )   PDF (1860KB) ( )   Aiming at the problem that the front door modal of pickup truck is not up to standard, finite element method combined with strain energy (ESE) is used to carry out modal optimization. Through simulation and real vehicle verification, the proposed optimization scheme can meet the requirements of the enterprise on the premise of no weight gain. It shows that the optimization method based on ESE is more efficient and effective than the traditional optimization method based on engineer's experience, which provides a certain reference for similar engineering optimization problems. References | Related Articles | Metrics

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Realization Method of Steering Road Sense in Driving Simulator HUANG Teng 2022, 47(23): 118-122.  DOI: 10.16638/j.cnki.1671-7988.2022.023.022 Abstract ( )   PDF (1796KB) ( )   Aiming at the problem that the steering system of the driving simulator lacks road sense feedback compared with the real vehicle, this paper designs a road sense model based on NARX neural network, and realizes the description of the friction dynamic characteristics of the steering system and the simulation of road sense. First, a driver in the loop data acquisition platform is built based on dSPACE and Carsim to realize the Controller Area Network (CAN) communication configuration of the driving simulator. Real time data of real drivers are collected, and the original data is filtered to complete the construction of NARX road sense model. Finally, the simulink/carsim joint simulation test is carried out on the road sense model. The test results show that the road sense model can effectively realize the road sense simulation function. References | Related Articles | Metrics

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Design of a Floating Caliper Disc Brake Caliper Body Based on Topology Optimization HE Daicheng 2022, 47(23): 123-126.  DOI: 10.16638/j.cnki.1671-7988.2022.023.023 Abstract ( )   PDF (2326KB) ( )   Based on the topology optimization method, the optimization design of the floating caliper disc brake caliper body of a passenger car was carried out by using the finite element simulation analysis technology. The optimization design determines the optimal topology structure to meet the requirements of the development of the floating caliper disc brake caliper body of a new passenger car. The optimized design ensures the reliability of the caliper body of the floating caliper disc brake of the passenger car in the use process. The optimization design provides a theoretical basis for the lightweight development of the caliper body of the floating caliper disc brake of passenger cars. The results show that the center deformation of the piston chamber cylinder hole is 0.158 mm, and the maximum tensile stress is 370.2 MPa, which meets the design requirements of deformation and stress. References | Related Articles | Metrics

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Design of a Special Vehicle Intelligent Power Distribution Module SUN Jin 2022, 47(23): 127-134.  DOI: 10.16638/j.cnki.1671-7988.2022.023.024 Abstract ( )   PDF (1512KB) ( )   This paper analyzes the development trend of special vehicle control system technology. The significance and problems of intelligent power distribution system research and development are summarized. Combined with practical application, the hardware architecture and system implementation of intelligent power distribution module are analyzed. By using electronic switches instead of relays and fuses, realized the intelligent power distribution and fault diagnosis function of the module. Controller Area Network (CAN) bus communication technology is used to communicate with the main system. The module meets the corresponding technical indicators and application requirements. The efficiency and safety performance of power distribution are optimized to a great extent. It has the characteristics of high intelligence, good maintainability and strong universality. The research and development of this module is also an important foundation for realizing unmanned driving in the future. References | Related Articles | Metrics

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Analysis of a Vehicle Equipped with Intelligent Electric Drive Air Conditioner ZHU Junfeng 2022, 47(23): 135-139.  DOI: 10.16638/j.cnki.1671-7988.2022.023.025 Abstract ( )   PDF (1257KB) ( )   This article mainly puts forward a scheme for the needs of a certain model user to turn on the air conditioner under the parking condition of summer night. On the basis of the existing service air conditioning system, the parallel electric compressor circuit is developed, the control strategy is developed, and finally the refrigeration performance and fuel consumption of the parking air conditioner are tested, and compared with the existing driving air conditioner, the fuel consumption and noise have been significantly reduced, which effectively solves the user's comfort needs for turning on the air conditioner at summer night. By equipping the intelligent electric drive air conditioner, it can effectively save the fuel consumption cost of turning on the air conditioner at night, reduce the noise of the vehicle air conditioner, and improve customer satisfaction. References | Related Articles | Metrics

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A Study on Main Defects and Improvement of Steering Wheel Foaming Process TAN Jie 2022, 47(23): 140-148.  DOI: 10.16638/j.cnki.1671-7988.2022.023.026 Abstract ( )   PDF (4249KB) ( )   In order to improve the first qualified rate of steering wheel body foaming process, this paper investigate the main defects and improvement method in the foaming process. Use quality tools to find the key factors of which the validity was evaluated by regression analysis. Experimental design method also involved in making interaction analysis of each factors and optimal solution solving. Through the key factors improvement and standard operating, the qualified rate of foam increased. The paper provided academic foundation for qualified rate improvement of steering wheel body foam and method of standard control on site by defining process parameter of each factors. References | Related Articles | Metrics

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Analysis on Pressure Fluctuation of Solenoid Valve in Transmission Hydraulic Control System DAI Liangshun 2022, 47(23): 149-153.  DOI: 10.16638/j.cnki.1671-7988.2022.023.027 Abstract ( )   PDF (1587KB) ( )   Aiming at the problem of pressure fluctuations in the direct drive solenoid valve of the hydraulic control system during the development of the transmission. In this paper, AMEsim software was used to build the simulation model of solenoid valve, and four kinds of damping system simulation models were established for simulation analysis. The influence of different damping on the outlet pressure of solenoid valve was studied, and the damping system model with the best pressure stability was obtained, which has been verified by experiments. The results show that the method of increasing the damping of the direct drive solenoid valve outlet can effectively improve the stability of the solenoid valve outlet pressure. Among the four damping system models, the four orifice model has the best pressure stability. This method can solve the problem of pressure fluctuations quickly and at a lower cost, and provides a new idea for solving the problem of pressure fluctuations. References | Related Articles | Metrics

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Cause Analysis and Improvement Measures of Abnormal Seat Noise of a Vehicle LI Caijuan 2022, 47(23): 154-159.  DOI: 10.16638/j.cnki.1671-7988.2022.023.028 Abstract ( )   PDF (2404KB) ( )   With the rapid development of the automobile industry, the vehicle become the main tool for people, and the seat is the most accessible parts for drivers and passengers. The abnormal seat noise affects the comfort of drivers and passengers directly and it is the most likely to cause customer complaints. This paper selects two kinds of abnormal seat noise with high customer complaints, which are central armrest noise and seat sliders noise. It analyzes the root cause and make improvement measures, and finally solves the problem. The measure is to modify the seat foam dimension and slide track ball dimension. It provides experience in seat design and solving abnormal seat noise for subsequent models. References | Related Articles | Metrics

Testing and Experiment

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Design and Test of Functional Safety Concept for Drive Motor System Based on ISO 26262 LI Zhengpeng 2022, 47(23): 160-164.  DOI: 10.16638/j.cnki.1671-7988.2022.023.029 Abstract ( )   PDF (1233KB) ( )   As the final output of vehicle torque, drive motor system has an important impact on vehicle driving safety. The functional safety development of the drive motor system based on the ISO 26262 standard can significantly reduce the system failure rate, improve the system stability, and improve the accuracy and reliability of the torque output of the drive motor system. This paper developed and tested the concept stage of functional safety for the drive motor system, obtained the safety objectives of the whole vehicle through hazard analysis and risk assessment, obtained the functional safety requirements through safety analysis and the establishment of safety mechanisms, and carried out verification tests through bench fault injection. The test results indicate that the drive motor system developed with functional safety can effectively avoid the excessive output torque of the drive motor and improve the safety of the whole vehicle. References | Related Articles | Metrics

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Influence of Alloy Element Content on the Rust of Brake Discs LI Miaoying 2022, 47(23): 165-168.  DOI: 10.16638/j.cnki.1671-7988.2022.023.030 Abstract ( )   PDF (1315KB) ( )   The rust of brake discs has a great influence on the brake judder. Two methods including indoor accelerated corrosion test and electrochemical corrosion test were used in this paper. The contribution of different alloy element content to the corrosion resistance of brake discs was analyzed, and the appropriate proportion of alloy addition was determined by using Six Sigma quality tool. The after-sales brake judder maintenance and customer complaints of brake discs with increased alloying elements were significantly reduced, which could provide a reference for the development and application of similar parts. References | Related Articles | Metrics

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Analysis of Automobile Safety Technology Based on C-NCAP (2018 Edition) LIU Peng 2022, 47(23): 169-175.  DOI: 10.16638/j.cnki.1671-7988.2022.023.031 Abstract ( )   PDF (2561KB) ( )   From July 2018 to the end of 2021, the china-new car assessment programme has completed the formal evaluation of 102 models. Taking the evaluation results of these 102 models as the research object, this paper statistically analyzes the active and passive safety performance of different types of models under different test forms. Combined with the evaluation results of China-new car assessment programme over the past 15 years, this paper quantitatively analyzes the safety performance gap between independent brands and joint venture brands through comparison. At the same time, the safety performance differences between electric vehicles and traditional fuel vehicles, as well as between new forces of vehicle manufacturing and traditional main engine manufacturers are analyzed, which provides important data support for the work related to vehicle safety test. References | Related Articles | Metrics

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Research on Resonance Sound in Van Truck YIN Jinxiang 2022, 47(23): 176-180.  DOI: 10.16638/j.cnki.1671-7988.2022.023.032 Abstract ( )   PDF (3706KB) ( )   To solve the problem of resonance sound in van truck caused by the gap between cab and cargo, the mechanism of noise generation and its transmission path are proposed, and the corresponding troubleshooting ideas are put forward, which is carried out from the aspects of excitation source, transmission path and response point, and the resonance the corresponding solutions to the problems are addressed. From the test results, the effect is obvious, which has significance for the solution of engineering problems. References | Related Articles | Metrics

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The Influence of Spring Plate on the Accuracy of Rotor Dynamic Balance System ZHANG Jiawei 2022, 47(23): 181-185.  DOI: 10.16638/j.cnki.1671-7988.2022.023.033 Abstract ( )   PDF (2033KB) ( )   In the rotor dynamic balance system, the spring plate is the transmission component of rotor vibration and the direct measurement component of vibration sensor. Its thickness plays an important role in the measurement accuracy of unbalance in the rotor dynamic balance system. Based on the self-designed rotor dynamic balance system, without changing other conditions and factors, this paper carries out rotor dynamic balance experiment under the condition of replacing spring sheets with different thicknesses such as 0.3 mm, 0.5 mm, 1 mm and 2 mm, and analyzes the influence of the thickness of spring sheets on the unbalance measurement accuracy of rotor dynamic balance system. The experimental results show that too thin spring plate will produce beat vibration, which can not be applied to the detection of rotor imbalance in dynamic balance system; The rotor unbalance detected by 1mm thick spring plate is the most accurate. References | Related Articles | Metrics

Process and Equipment

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Design and Application of Automotive Tailpipe Decorative Cover Based on 3D Printing YAN Ying 2022, 47(23): 186-191.  DOI: 10.16638/j.cnki.1671-7988.2022.023.034 Abstract ( )   PDF (1433KB) ( )   To explore the feasibility and effectiveness of 3D printing technology in the design of automobile tailpipe decorative cover. On the basis of expounding the principle and technical difficulties of 3D printing technology, combined with the structural principle, appearance and assembly requirements of automobile tailpipe decorative cover, and considering the sample trial production and review in the product development stage, this paper discusses the application of 3D printing technology in the design and manufacturing of automobile tailpipe decorative cover, and combined with reverse engineering, The sample of automobile tailpipe decorative cover made by 3D printing is inspected in 3D. The inspection and analysis results show that the sample of automobile tailpipe decorative cover made by 3D printing technology can meet the appearance and assembly requirements. With its unique advantages, 3D printing has an important impact on product development and manufacturing in the automotive industry. With the continuous improvement of 3D printing technology in materials, processes, etc., it will certainly have an impact on the development of the automotive industry in the future. References | Related Articles | Metrics

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Optimization of Numerical Control Machining Program for a Heavy Truck Engine Support WEI Chao 2022, 47(23): 192-195.  DOI: 10.16638/j.cnki.1671-7988.2022.023.035 Abstract ( )   PDF (1139KB) ( )   In recent years, with the rapid development of China's automobile industry, which gradually becomes the mainstay industry in machinery manufacturing industry, the numerical control technology in the automotive industry plays a pivotal role, especially in the machining of key parts in the field of heavy trucks. For products with simple shape/structure, for convenience and speed, the numerical control machining programs are usually completed by manual programming. Taking the engine support of a heavy truck as an example, this paper studied the machining content of drilling four bottom holes and milling 3° surface. Through an analysis of product processing technology, two processing technology schemes were formulated. According to the process scheme, the two manual programming methods of scheme A and scheme B were compared and analyzed by FANUC numerical control system programming. After the field practice for many times, we concluded that by applying G68 rotating instructions, scheme B can simplify the programming difficulty, improve programming efficiency, reduce the error rate of programming and provide a new idea and method for the subsequent products of the same type. References | Related Articles | Metrics

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Analysis of Improvement of Rain Leakage in Cab of Newly Developed Heavy-duty Long-head Truck WANG Shasha 2022, 47(23): 196-202.  DOI: 10.16638/j.cnki.1671-7988.2022.023.036 Abstract ( )   PDF (3410KB) ( )   In order to solve the 14 rain leakage problems found in the rain test of the cab of the newly developed heavy-duty long-head truck, the causes of water leakage at the rain leakage point were deeply analyzed, and the rectification measures were formulated from the two aspects of design change and process breakthrough. The actual verification showed that the improvement effect of rain leakage point was remarkable, which improved the rain proof and sealing performance of products, and laid a solid foundation for the finalization and mass production of subsequent models. At the same time, the formed rectification measures can provide reference for the improvement of rain proof and sealing performance of similar products in the automotive industry. References | Related Articles | Metrics

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Discussion of the Pull Production Strategy between Sublines and the Mainline of Body Shop FENG Hanzhang 2022, 47(23): 203-210.  DOI: 10.16638/j.cnki.1671-7988.2022.023.037 Abstract ( )   PDF (2540KB) ( )   According to the scheme of the side perimeter sub-assembly line, the aerial conveyor system and the main line in the body shop of a SAIC volkswagen plant, the paper introduced the premise and methodology for utilizing plant simulation software to output analyzed results, along with various aspects in the process of making production strategy. These are based on the concept of sublines, the electrified monorail system (EMS) and the mainline in a body shop of SAIC volkswagen. A series of optimized production pull strategy are discussed through the investigation of an extreme case. The relationship between buffer and production are summarized at the end of the paper. The results of the study are not only suitable for solving the general problems of the pull production between lines in the body shop of all SVW car plant, but also have referential value for all body shops with high volume and multi-vehicle in automobile industry. References | Related Articles | Metrics

Automobile Education

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Exploration on Project-based Teaching Reform of Single-chip Microcomputer Course Based on OBE Concept WANG Jia 2022, 47(23): 211-214.  DOI: 10.16638/j.cnki.1671-7988.2022.023.038 Abstract ( )   PDF (1990KB) ( )   Single-chip microcomputer course is a main professional basic course of automobile service engineering specialty. Due to the problems of loose combination of theory and practice and single teaching mode in the traditional single-chip microcomputer teaching process, this paper put forward a project-based teaching reform method of single-chip microcomputer course based on the concept of outcome based education (OBE). With the outcome based as the goal, the design ideas of project-driven, reverse design and positive implementation were adopted to determine the curriculum teaching objectives and teaching contents, optimize the teaching design and continuously improve the curriculum assessment methods. Through practice, the diversified teaching reform not only solves the problems existing in the teaching process of single-chip microcomputer, but also cultivates students' independent consciousness, innovative consciousness and practical ability. References | Related Articles | Metrics

Standards Regulations Management

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Intelligent Scheduling Method of Passenger Transportation Based on Urban Tourism ZHANG Yue 2022, 47(23): 215-219.  DOI: 10.16638/j.cnki.1671-7988.2022.023.039 Abstract ( )   PDF (1349KB) ( )   The rapid development of tourism can bring rich economic income to tourist cities. As a world-renowned tourist city, Nyingchi City is the key direction of its urban development to ensure the high-quality development of tourism. Due to the imperfect tourism infrastructure of Nyingchi City and the lack of a reasonable passenger transportation planning system, tourists cannot obtain high-quality service levels, resulting in huge economic losses. Based on the fact that most tourists in Nyingchi City will choose the tourism mode of urban tourism, with the purpose of shortening the travel time of tourists and improving the service level of the tourist passenger transportation system, this paper establishes a scheduling model through genetic algorithms from tourism, passenger transportation, service, economy and other aspects, formulates the corresponding evaluation index system, applies the intelligent scheduling method to the passenger transportation of Nyingchi City,and proves the feasibility of this scheduling method, and provides reasonable suggestions for the future development of tourism passenger transportation system in Nyingchi City. References | Related Articles | Metrics

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Basic Method of Vehicle Mass Management WU Yanjie 2022, 47(23): 220-223.  DOI: 10.16638/j.cnki.1671-7988.2022.023.040 Abstract ( )   PDF (1369KB) ( )   As consumers pay more and more attention to the fuel economy of automobiles, the main engine manufacturers pay more and more attention to the mass control of the whole vehicle. Research shows that the fuel consumption can be reduced by 7% ~ 8% for every 10% reduction in the mass of vehicle. If the mass of the whole vehicle is to be controlled within a reasonable range, it must be controlled in the new product development stage. At present, the vehicle mass control mainly includes the steps of mass analysis of benchmark competitive products, goal setting, goal decomposition, formulation, promotion of mass reduction scheme, and evaluation of goal achievement. This paper mainly describes the vehicle mass management process, how to set and decompose the mass target, the formulation and promotion of the mass reduction scheme of each system, and the evaluation of the vehicle mass target. Through the above methods, the vehicle mass can be effectively controlled in the product development stage. References | Related Articles | Metrics

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Design of Auto Insurance Scheme for Expressway Enterprises YU Haihong 2022, 47(23): 224-227.  DOI: 10.16638/j.cnki.1671-7988.2022.023.041 Abstract ( )   PDF (1025KB) ( )   The new policy of motor vehicle insurance reform has been implemented since september 19, 2020. The reform has made considerable efforts. In motor vehicle insurance, the compensation limit or protection scope of several main types of insurance have changed, such as compulsory traffic accident liability insurance, own damage and third party liability insurance. Under the background of the new policy of vehicle insurance reform, this paper analyzes the risk factors of vehicle operation of expressway enterprises, puts forward the requirements of enterprise vehicle safety management, and redesigns the motor vehicle insurance scheme in combination with the content of the new policy, so as to further reduce the probability of accidents, improve the work performance of enterprises, and protect the economic interests of vehicles and personnel to the greatest extent. References | Related Articles | Metrics

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Establishment and Application of the Brand Voice and Marketing Effect Monitoring Platform HU Huiying 2022, 47(23): 228-231.  DOI: 10.16638/j.cnki.1671-7988.2022.023.042 Abstract ( )   PDF (1220KB) ( )   Online marketing channel is an important channel for corporate marketing, public opinion management and even brand building. Therefore, integrating consumer feedback from online channels and improving the efficiency of information monitoring has become an important task for brand management. The purpose of this paper is to study the establishment of a brand voice and marketing effect monitoring platform. The monitoring content includes four modules: volume monitoring, consumer evaluation and emotion, consumer recommendation and transformation, and public opinion transformation. This paper introduces the method of content acquisition and establishment of platform content through big data and speech analysis. In addition, it provides supplementary marketing effect monitoring for brand research. And it provides support for the follow-up research on the measurement of brand power. References | Related Articles | Metrics

Overview

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Review on Local Path Planning Algorithm for Intelligent Vehicle MA Xiaolu 2022, 47(23): 232-237.  DOI: 10.16638/j.cnki.1671-7988.2022.023.043 Abstract ( )   PDF (1252KB) ( )   In order to improve the driving stability and rationality of intelligent vehicles, this paper classifies and summarizes the local path planning algorithms commonly used by intelligent vehicles in recent years. Firstly, this paper expounds the principles of various traditional algorithms, analyzes their advantages and disadvantages, and points out the shortcomings of traditional algorithms in the application of intelligent vehicles. Secondly, this paper sorts out and analyzes the improved algorithms proposed by scholars when various traditional algorithms are applied to intelligent vehicles. Finally, it is proposed that the algorithm based on discrete optimization is the application trend of intelligent vehicle local path planning in the future, and the fusion of multiple algorithms is the research direction of intelligent vehicle local path planning in complex scenarios. The research results of this paper can provide reference for researchers in the field of intelligent vehicles when choosing local path planning algorithms. References | Related Articles | Metrics

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Research Progress of Annular Liquid Film Jet Atomization SHI Haozhe 2022, 47(23): 238-243.  DOI: 10.16638/j.cnki.1671-7988.2022.023.044 Abstract ( )   PDF (1250KB) ( )   Spraying is widely used in many fields such as agriculture, aerospace, engine, medical and so on. Good liquid film atomization plays a vital role in reducing energy loss, among which annular jet has the characteristics of short fragmentation length and high atomization quality with its unique structure, so this paper elaborates the research status of annular liquid film jet fragmentation from three perspectives: theoretical research, experimental research and simulation analysis. The focus is on the mechanism of liquid film fragmentation, and the main factors affecting the liquid film fragmentation are summarized in the relevant analysis. The results show that linear stability analysis theory and nonlinear stability analysis theory are still the basis of theoretical analysis, large eddy simulation (LES) and volume of fluid (VOF) method are the more applied research methods of numerical simulation, liquid viscosity, Weber number, liquid surface tension, etc. have a greater influence on annular jet atomization. However, the study of atomization quality under large liquid Weber number is still relatively small, increasing the choice of operating point and increasing the mutual verification between simulation and experiment, which is one of the important difficulties in the future research and development of the annular jet. References | Related Articles | Metrics