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15 January 2022, Volume 47 Issue 1 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Simulation of Heat Dissipation Characteristics of Lithium Battery of Electric Vehicle Based on Fluent YAO Yuxuan 2022, 47(1): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2022.001.001 Abstract ( )   PDF (2109KB) ( )   In order to analyze the problem of battery heat dissipation, the serial and parallel heat dissipation methods are compared by using the finite element simulation method. Firstly, the heat generation reasons of lithium battery are analyzed, and its heat generation characteristics are researched. Then, for a certain lithium-ion battery, the finite element simulation software Fluent is used to simulate the serial and parallel air-cooled heat dissipation modes. The results show that the heat dissipation of the battery is relatively uniform during serial ventilation and the battery near the air inlet and outlet has good heat dissipation effect. In parallel ventilation and heat dissipation, the heat dissipation effect increases gradually, and it is better when the battery is close to the outlet. References | Related Articles | Metrics

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Research on Development Strategy of Acoustic Packaging for Pure Electric Vehicles LV Heping 2022, 47(1): 6-9.  DOI: 10.16638/j.cnki.1671-7988.2022.001.002 Abstract ( )   PDF (2318KB) ( )   With the continuous improvement of energy saving and emission reduction requirements, automobile lightweight has become an important means to effectively reduce fuel consumption and improve automobile fuel economy. However, there is a certain conflict between vehicle lightweight and NVH performance. This paper uses experimental verification methods to compare and analyze the noise frequency components of the powertrain of pure electric vehicles and traditional fuel vehicles. Develop corresponding verification schemes based on relevant differences and characteristics. Through actual vehicle verification, the effectiveness of the program is determined. In the case of no significant deterioration of the noise in the car, the goal of reducing costs and reducing weight is achieved. References | Related Articles | Metrics

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Simulation Analysis of Coupling Coil of Electric Vehicle Wireless Charging System DOU Shengyue 2022, 47(1): 10-13.  DOI: 10.16638/j.cnki.1671-7988.2022.001.003 Abstract ( )   PDF (1138KB) ( )   Electric vehicle wireless charging technology has attracted more and more attention due to its advantages such as safe operation, convenience and flexibility, and has provided fresh vitality for the development of electric vehicles. The coupling coil is a key component of field energy conversion and energy transmission in the wireless charging system, which fundamentally affects the performance of the entire system. Firstly, the coupling coil model is established in the finite element simulation software Ansys Maxwell, including two coupling coils with only coupling coil and aluminum plate with magnetic core; then the two models are simulated to analyze the magnetic field distribution, mutual inductance and coupling coefficient of the magnetic core aluminum plate. Simultaneously, the relationship between the coupling coefficient and the transmission distance and offset distance of the coupling coil is obtained by simulation. References | Related Articles | Metrics

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Analysis of Tiguan L PHEV Braking Energy Recovery System LI Hua 2022, 47(1): 14-18.  DOI: 10.16638/j.cnki.1671-7988.2022.001.004 Abstract ( )   PDF (3579KB) ( )   When the traditional car decelerates or brakes, the vehicle motion energy is converted into heat energy through the braking system and released into the atmosphere. And new energy vehicles through braking energy recovery technology into electric energy storage battery, so as to improve the endurance of the vehicle. New energy vehicles in the braking process, to ensure the braking stability and stability, and as much as possible to recover the braking energy, in order to extend the range of new energy vehicles. By studying the definition, composition and working principle of the braking energy recovery system, this paper analyzes the working process of regenerative braking energy recovery of the motor of new energy vehicles and the braking energy recovery system, and clarifies the role of each component of the braking energy recovery system. It focuses on the composition of the Tiguan L PHEV braking system, the hybrid braking principle of the Tiguan L PHEV braking energy recovery system, that is, the support of deceleration request, friction deceleration, regenerative deceleration and the support of the three-phase current drive device are less than four working processes; the Tiguan L PHEV braking energy recovery system is mainly realized by controlling electromechanical brake booster E-BKV and accumulator VX70. The driver's deceleration request is the synthesis of friction deceleration and energy recovery deceleration. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Frame-matching Method Based on Laser and Vision Fusion HE Zhongwei 2022, 47(1): 19-23.  DOI: 10.16638/j.cnki.1671-7988.2022.001.005 Abstract ( )   PDF (2414KB) ( )   Simultaneous location and mapping (SLAM) is an important guarantee for robot to realize self navigation ability in unknown environment. At present, the main sensors used in SLAM algorithm are lidar or vision camera. Lidar can range more accurately, and visual camera can reflect the rich texture information of the environment. Compared with using a single sensor, SLAM algorithm can obtain more environmental information and achieve better positioning and mapping effect. In this paper, an inter frame matching method combining lidar and vision camera is proposed. By adding ground constraints and visual feature constraints in the process of slam inter frame matching, the accuracy of inter frame matching process is improved, the robustness of algorithm is enhanced, and the overall effect of SLAM algorithm is improved. Finally, the paper uses the collected underground parking data to verify the results, and compares with the open source algorithm A-LOAM. The results show that the relative pose error of the proposed method is improved by about 30% compared with A-LOAM. References | Related Articles | Metrics

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Research on Tracking of Unmanned Vehicle Based on MPC CAI Zhixin 2022, 47(1): 24-27.  DOI: 10.16638/j.cnki.1671-7988.2022.001.006 Abstract ( )   PDF (1149KB) ( )   In order to better realize the tracking and correction of the driving path of the driverless car, the speed and yaw angle of the vehicle are controlled based on the model prediction algorithm. By establishing the vehicle kinematics model, formulating the objective function, and determining the constraint conditions, the trajectory tracking controller is designed. And build model predictive control algorithm through Matlab/Simulink and CarSim software. The results show that under predetermined conditions, the vehicle reference path and the actual driving error are small, and there is good lateral stability.The results show that the algorithm can guarantee the safety of driverless cars to a certain extent, and provides a basis for intelligent vehicle control. References | Related Articles | Metrics

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Research on Improved Decision Algorithm of Deep Deterministic Policy Gradient CHEN Jianwen 2022, 47(1): 28-31.  DOI: 10.16638/j.cnki.1671-7988.2022.001.007 Abstract ( )   PDF (1105KB) ( )   In order to solve the problem of decision-making control in the process of unmanned path planning, in view of the deep deterministic policy gradient algorithm, there are defects such as low training efficiency and unstable convergence, with the increase of search space in unknown environments. An improved algorithm based on reward guidance is proposed. Firstly, prioritized experience replay based on reward is adopted in each round to reduce the blindness of random exploration of the deep deterministic policy gradient algorithm and improve the learning efficiency of the intelligent vehicle. Then, the excellent trajectory is selected based on reward between rounds to guide the intelligent vehicle to explore complex space and obtain a stable control strategy. Finally, the simulation is carried out in the open-source intelligent driving simulation environment. The experimental results show that the performance of the improved deep deterministic policy gradient algorithm is better than the original algorithm, and the training efficiency and convergence stability are effectively improved. References | Related Articles | Metrics

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Research on the On-board Network Protection Technology of Intelligent Networked Vehicles JIA Xianfeng 2022, 47(1): 32-35.  DOI: 10.16638/j.cnki.1671-7988.2022.001.008 Abstract ( )   PDF (984KB) ( )   As the communication buses of intelligent networked vehicles become more and more abundant, the risk of safety exposure of the traditional CAN communication bus is getting higher and higher. Currently, there is an urgent need for information security protection for vehicle-mounted networks to improve the privacy, accuracy, and reliability of vehicle-mounted communications. This article mainly introduces the security protection principle of in-vehicle network. By citing encryption and decryption algorithms, fresh value information, identity verification and other related technologies, the in-vehicle network security protection is low-cost, fast and effective in a short period of time, and the intelligent network connection is improved. The level of car information security protection. References | Related Articles | Metrics

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Research on Tracking Control Method of Intelligent Vehicle TIAN Shengzhe 2022, 47(1): 36-39.  DOI: 10.16638/j.cnki.1671-7988.2022.001.009 Abstract ( )   PDF (1030KB) ( )   With the development of informatization, the application prospect of intelligent driving technology is broad. As a part of intelligent driving technology, trajectory tracking control has received more and more attention. This article introduces the kinematics and dynamics models of smart cars, elaborates the theoretical derivation of several commonly used tracking control methods, and analyzes their respective applicable scenarios and advantages and disadvantages. It can be seen that no matter which control method has its drawbacks, the difference in modeling method and driving speed will affect the control effect. Therefore, it is necessary to make improvements in combination with the actual situation to make the control of smart cars more applicable. References | Related Articles | Metrics

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Research on Real Vehicle Road Test Route Scheme in ADAS System FAN Li 2022, 47(1): 40-44.  DOI: 10.16638/j.cnki.1671-7988.2022.001.010 Abstract ( )   PDF (1170KB) ( )   It is one of the most important problems to select and formulate the test route of ADAS system vehicles when they are tested on real road. Based on the analysis of environment perception technology of ADAS system and considering the influence factors of road traffic safety, this paper come up with the principle of road scene classification and route selection for vehicle test of Adas System, which provides support for improving the efficiency and effect of road test. References | Related Articles | Metrics

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Multi-Object Tracking Algorithm Based on Hungarian Matching and Kalman Filtering LI Jianguo 2022, 47(1): 45-50.  DOI: 10.16638/j.cnki.1671-7988.2022.001.011 Abstract ( )   PDF (1113KB) ( )   In order to obtain accurate information about the target detection of unmanned vehicles,by segmenting and clustering the calibrated original lidar point cloud, the Hough line is used to detect the outsourcing frame of the obstacle, and finally the Hungarian algorithm is used to correlate and match the tracked obstacle and the newly detected obstacle, and find the optimal solution, and finally use the Kalman filter algorithm to optimize its state. Experiments show that the algorithm can quickly and accurately track the detected obstacles within 0.1 s of a lidar frame. References | Related Articles | Metrics

Design and Research

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Simulation and Optimization of Front Suspension Based on ADAMS FAN Zixin 2022, 47(1): 51-54.  DOI: 10.16638/j.cnki.1671-7988.2022.001.012 Abstract ( )   PDF (1499KB) ( )   Suspension system plays a very important role in a car, determines the vehicle handling stability and ride comfort. In order to make the preliminary design of the double wishbone independent suspension performance improved, therefore, the front suspension is optimized by multi-objective topology optimization method. Firstly, established the template subsystem of front suspension system of the existing vehicle in ADMAS/CAR, the change curve of wheel positioning parameters were simulated. Then, in the ADAMS/Insight module, the design goal was wheel positioning parameter, the design variable was the front suspension hard point coordinate, depending on the sensitivity, optimized the hard point coordinates of the front suspension, curve comparison results show that the optimization is effective. References | Related Articles | Metrics

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Discussion of the Mechanism and Evaluation Method of Automobile Intermittent Shake WANG Jinli 2022, 47(1): 55-60.  DOI: 10.16638/j.cnki.1671-7988.2022.001.013 Abstract ( )   PDF (1848KB) ( )   This article discusses the phenomenon and naming of the intermittent shake of the vehicle. The frequency of the intermittent shake is the rigid body modal frequency of the power train mount, not the half-order of the speed or the half-order of the combustion. The mechanism of intermittent shake and the main transmission path are analyzed. If the engine combustion calibration control is abnormal or the combustion stability is not attended during the calibration development process, it will cause the engine to abnormal combustion, including poor combustion or multi-cylinders misfire, which is the root cause of intermittent shake. Finally, the calibration parameters such as fuel injection control, intake control, and ignition control that have a greater impact on combustion stability are discussed, and commonly used combustion stability indicators and recommended limits are given. Discussed the evaluation method of vehicle intermittent shake, including parameters such as flywheel end angular acceleration, seat vibration peak coefficient and vibration dose value. Finally, combined with the intermittent shake problem of a 1.5 T engine matching a vehicle, the investigation found that the EOIT angle control in the fuel injection control of the engine has a greater impact on the combustion. The combustion stability parameters of the original calibration data are all lower than the recommended limit, optimized EOIT from 65 BDTC to 85 degrees BDTC, the combustion stability parameter meets the combustion stability limit, and the vibration amplitude of the abnormal frequency band is reduced from 10 mg to 2.5 mg, and the drop rate reaches 75%, which solves the intermittent shake of the car. and meet the requirements of emission regulations. References | Related Articles | Metrics

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A Method for Time Synchronization between On-chip and Off-chip of Domain Controller FENG Liangshan 2022, 47(1): 61-64.  DOI: 10.16638/j.cnki.1671-7988.2022.001.014 Abstract ( )   PDF (1264KB) ( )   At present, the E/E architecture of the whole vehicle is becoming more and more complex due to the data interaction requirements from different controllers and sensors. The problems to be solved include: functional complexity, communication bandwidth, computing capacity, flexibility, scalability, etc. The upper application algorithm of domain controller is particularly sensitive to the synchronization of data acquisition. Data fusion needs to be processed for the data obtained at the same time point. Therefore, it is particularly important to research the time synchronization of heterogeneous multi-core, external controller data and sensor data in domain controller. This paper introduces the method of time synchronization in and out of chip of domain controller in detail, and solves the technical defects of the time synchronization of internal and external data of domain controller. References | Related Articles | Metrics

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Sound Pack Optimization Design for Sedan Automobile Parcel Shelf Panel MENG Shu 2022, 47(1): 65-68.  DOI: 10.16638/j.cnki.1671-7988.2022.001.015 Abstract ( )   PDF (1956KB) ( )   At the moment, more and more customers pay attention to NVH performance in automobile. With the development of electric automobile, there is more challenge for NVH performance, especially for high frequency noise. So it is quite important for sound pack optimization in electric automobile. By evaluation of an electric sedan car on the road, there is a passenger complaint for rear seat high frequency noise, which comes from parcel shelf. Based on above information, it does tightness test and transfer test, and optimize noise path. Test result shows that in order to decrease high frequency noise, first, it needs to seal unnecessary holes on the path of noise transfer inside the car. Second, it needs to decrease necessary hole size on the parcel shelf. Finally, when arranging ventilation evacuation holes, it proposes to optimize and design air path to make noise path longest in absorption material. References | Related Articles | Metrics

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Analysis of Hybrid Gearbox of Mainstream Dual Motor ZHANG Xizhou 2022, 47(1): 69-73.  DOI: 10.16638/j.cnki.1671-7988.2022.001.016 Abstract ( )   PDF (1510KB) ( )   The dual E-motor hybrid gearbox has become the mainstream system for hybrid vehicles. This article analyzes the classification of hybrid gearboxes and extends the two technical branches of seriesparallel and power split. Analysis of several mainstream systems, such as Honda-I-MMD, SAIC EDU, BYD DM-I, Toyota THS, etc., the principle, advantages and disadvantages of the two branches are explained. This article focuses on analyzing the technical solutions and development trends of dual-motor gearboxes of different manufacturers in series-parallel configurations, and concludes that the layout of two E-motors and ICE/E-motor with two or more gears will become mainstreams. This paper could provide references and suggestions for enterprises interested in developing hybrid gearbox. References | Related Articles | Metrics

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Analysis and Improvement of Instrument Panel Ringing in an SUV ZHENG Hongsheng 2022, 47(1): 74-77.  DOI: 10.16638/j.cnki.1671-7988.2022.001.017 Abstract ( )   PDF (3577KB) ( )   All kinds of abnormal noise of automobile have always been the front row problem of complaint list, which has a great impact on the quality of the whole vehicle, the abnormal noises in the early stage of vehicle development must be paid attention to and solved as soon as possible. This paper introduces the analysis and improvement of abnormal noise in the middle area of the instrument panel of an SUV. According to the product structure design and development experience, the possible causes of abnormal sound are sorted out, and verified one by one to confirm the final confirmation of the cause of the problem. According to the causes of the problem to develop appropriate corrective measures, and implement to solve the problem. The elimination of abnormal noise can further improve product quality and user reputation. References | Related Articles | Metrics

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Weight Target Setting Method for Sedan BIW SONG Guanghuang 2022, 47(1): 78-81.  DOI: 10.16638/j.cnki.1671-7988.2022.001.018 Abstract ( )   PDF (1039KB) ( )   This paper discusses the factors which affecting sedan BIW weight, including gross vehicle weight, BIW torsional stiffness, length, width, height and other dimensions. It finds out the key factors affecting sedan BIW weight through best subset regression analysis. Based on multiple linear regression analysis, this paper studied the relationship between the optimal influencing factors and sedan BIW weight. Then deduces a method for setting sedan BIW weight target, which provides an important reference for the development and setting of BIW weight target in the project development process. References | Related Articles | Metrics

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Lightweight Design and Optimization of Front Wheel Column of Racing Car Based on FSAE YUAN Jingyu 2022, 47(1): 82-85.  DOI: 10.16638/j.cnki.1671-7988.2022.001.019 Abstract ( )   PDF (3231KB) ( )   As a key system of the FASE racing car, the excellent suspension system can not only bring good ride comfort to the driver, but also improve the handling stability of the vehicle and enhance the competitiveness of the car in the competition. In the design of the suspension system, the unsprung quality is one of the key factors that affect the performance of the suspension system. As an important part of the unsprung quality, the lightweight design of the steering column has always been the key to breaking through and improving, and designing an excellent column, it can bring good maneuverability to the car. This article elaborated on the design of the column, analyzed the structural requirements of the column and the force under various working conditions, redesigned its structure, and applied ANSYS Workbench software to analyze its stress and strain. Lightweight improvements. References | Related Articles | Metrics

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Development of Silencer in Air Intake System for the Supercharged Engine WANG Zhiqiang 2022, 47(1): 86-89.  DOI: 10.16638/j.cnki.1671-7988.2022.001.020 Abstract ( )   PDF (3846KB) ( )   The acoustic performance of air intake system plays an important role in vehicle NVH, which affects the driving feeling of drivers and passengers. This paper focuses on the optimization of air intake system of the vehicle. By analyzing the test results of air inlet noise, the acoustic optimization of air intake system is carried out; Then, the acoustic performance of the silencer is verified by simulation and experiment separately, the result of experiment show that the performance of the silencer could meet the target of the whole vehicle. The simulation methods and experiments involved in optimization could have a certain reference value for air intake system designing. References | Related Articles | Metrics

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Research and Development of Hydraulic Retarding System for WCJ8E Explosion-proof Trackless Rubber Wheel Car WANG Denghua 2022, 47(1): 90-93.  DOI: 10.16638/j.cnki.1671-7988.2022.001.021 Abstract ( )   PDF (3739KB) ( )   At present, the wet brake of the trackless rubber wheeler is worn out prematurely or even fails due to the large slope and long distance of auxiliary transportation in underground coal mine. Taking WCJ8E explosion-proof trackless rubber wheel car as the research object, the matching hydraulic retarding system is developed as the vehicle auxiliary braking. The application results show that: the use frequency of wet brake is greatly reduced, the premature wear and thermal decay failure does not exist, and the efficient operation and safety and reliability of the vehicle are guaranteed. References | Related Articles | Metrics

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Common Faults and Improvement of Light Truck Spare Tire Lifter SONG Xinlei, WU Zhaoliang 2022, 47(1): 94-97.  DOI: 10.16638/j.cnki.1671-7988.2022.001.022 Abstract ( )   PDF (3958KB) ( )   This paper introduces the common faults of the light truck spare tire lifter and the improvement measures for the main problems. The spare tire lifter mainly has three kinds of faults: loose spare tire during use, stuck spare tire lifter, shaking or rotation during use. According to the structural principle of the spare wheel lifter, the possible causes of three kinds of faults are systematically analyzed through FT diagram, and the main causes are explained. On this basis, the improvement suggestions are given: the lubrication of the spare wheel lifter, the spring pressing force, the dust cover design, and the friction coefficient of the joint surface between rim and cross beam need to be paid special attention. References | Related Articles | Metrics

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Design of Alarm Device for Children's Mislocking in Vehicle LI Feng 2022, 47(1): 98-101.  DOI: 10.16638/j.cnki.1671-7988.2022.001.023 Abstract ( )   PDF (1060KB) ( )   In order to avoid the tragedy of children being locked in the car by mistake, an alarm device for children locking in the car by mistake is designed in this paper. The device is mainly composed of three parts: signal detection and acquisition module, signal processing control module and signal execution. Through the detection of each sensor module, when the children in the car are stranded in the car due to their parents' forgetting, it sends alarm information to the car owner, opens the window and broadcasts prestored parent video in the car to calm the children's emotions, so that the driver can find the trapped children in time. Reduce the occurrence of children being locked in the car by mistake and ensure the safety of children. References | Related Articles | Metrics

Testing and Experiment

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Modal Analysis of a Composite Leaf Spring with Main Spring and Auxiliary Spring in a Light Bus KE Jun 2022, 47(1): 102-107.  DOI: 10.16638/j.cnki.1671-7988.2022.001.024 Abstract ( )   PDF (3322KB) ( )   In order to investigate and efficiently control the modal characteristics of the composite spring of a light bus, the finite element model of the composite spring was established by ABAQUS software, and the stiffness and modal characteristics of the composite spring were simulated. Because the stiffness and mode simulation results of the single sheet composite plate spring are consistent with the corresponding test results, the simulation results of the finite element model of the main and side spring composite plate spring established using the same material parameters and modeling method are credible. According to the simulation results, the paving Angle of composite spring, composite density and enhance the fiber elastic modulus affect the mode frequency, conduct sensitivity analysis, put forward the corresponding matching design idea, which is important to improve the design theory of composite spring and promote its promotion and application. References | Related Articles | Metrics

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Research on Monitoring Method of Vehicle Powertrain Dynamic Motion Based on Frequency-domain Integration LANG Chunyan 2022, 47(1): 108-112.  DOI: 10.16638/j.cnki.1671-7988.2022.001.025 Abstract ( )   PDF (2480KB) ( )   The powertrain dynamic motion is the key parameter of the vibration and comfortable performance of the vehicle. And the conventional acceleration signal characteristics are often unable to characterize the low-frequency motion feature of the powertrain effectively. Based on the principle of the frequency-domain integration and the method of multi-point motion synthesis, an algorithm for monitoring the dynamic motion of the vehicle powertrain is proposed. The algorithm first performs quadratic integration on the acceleration signal in the frequency domain, and then sets the ultra-low frequency components to be zero. These can eliminate the deviation of the sensor zero drift and temperature drift effectively, and improve the calculation accuracy of the displacement signal. Performing the method of motion synthesis on the multi-point signal, the six-degree-of-freedom motion characteristic of a powertrain rigid body is obtained. The applications of the automobile acceleration condition and the key-on/key-off condition shows that the proposed algorithm can obtain the dynamic motion characteristic of the rigid body of the vehicle powertrain effectively and intuitively. References | Related Articles | Metrics

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Research on FAR-SIDE Occupant Protection Based on Collision Test LIU Xiaodong 2022, 47(1): 113-117.  DOI: 10.16638/j.cnki.1671-7988.2022.001.026 Abstract ( )   PDF (5203KB) ( )   Side collision is a common form of traffic accidents, large number of casualties occur in both near side and far side of the collision. Previous studies were more focused on the near side of the collision, and relatively insufficient on the far side. Euro NCAP has incorporated the far-side assess in its evaluation scope from 2020, which is implemented mainly through two sled tests. In this paper, the test method and evaluation standard of far-side assess were analyzed. By conducting the sled tests, and analyzing the process of movement and injury of the dummy in the collision, the occupant protection in far side impact was studied. References | Related Articles | Metrics

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Research on Non-stationary Random Vibration Performance of Vehicle Suspension System under Varied Accelerated Conditions HE Zhangcheng 2022, 47(1): 118-122.  DOI: 10.16638/j.cnki.1671-7988.2022.001.027 Abstract ( )   PDF (1814KB) ( )   The non-stationary random excitation of the vehicle and the non-stationary random vibration response caused by the vehicle under various acceleration conditions are studied. The covariance equivalent method and the filtered white noise method are used to establish the road excitation model of the vehicle under different accelerations. The vertical integration method is used to solve the vertical acceleration response of the wheel and the body of the 1/4 vehicle model under different road excitations. It is concluded that when the vehicle travels through the same grade of road surface in the same time, the non-stationary excitation of the road surface, the vertical acceleration of the body and the wheel, will all increase with the increase of the acceleration. References | Related Articles | Metrics

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Performance Improvement and Test Verification of Brake Pedal Feel for a Certain Vehicle Type WANG Fei 2022, 47(1): 123-126.  DOI: 10.16638/j.cnki.1671-7988.2022.001.028 Abstract ( )   PDF (1758KB) ( )   In this paper, the improvement of the feeling of the brake pedal is described from the objective evaluation angle, aiming at the lack of brake confidence of a certain vehicle model, after checking the objective data of brake pedal and the industry standard, it is found that the indexes of brake pedal sensibility are generally poor. By analyzing the changes of the structure and parameters of the vacuum booster and the brake master cylinder, a comparison verification scheme is made to verify the feasibility of the optimization scheme of the brake system. References | Related Articles | Metrics

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Research on Bus Side Impact Test Based on Safety Technical Conditions for Electric Bus BAI Fanghua 2022, 47(1): 127-131.  DOI: 10.16638/j.cnki.1671-7988.2022.001.029 Abstract ( )   PDF (3279KB) ( )   In order to analyze the feasibility of bus side impact occupant protection test method in safety technical conditions for electric bus. According to the standard, the bus side impact test was carried out. By analyzing the damage of side impact dummy, it is found that the test method can not reproduce the condition of bus collision with bus with serious passenger injury. By analyzing the acceleration curve of the test vehicle, the arrangement points of the acceleration sensors are obtained, which lays a foundation for the research on the test method of occupant protection in bus side impact. References | Related Articles | Metrics

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Application of Integral Method of Relative Displacement Measurement in Vehicle NVH Performance Development SHI Lei 2022, 47(1): 132-135.  DOI: 10.16638/j.cnki.1671-7988.2022.001.030 Abstract ( )   PDF (3515KB) ( )   In the development of vehicle NVH performance, the relative displacement of each damping system is an important evaluation index. The traditional displacement sensor cannot measure the displacement in a narrow space, and need to make auxiliary fixture to be able to install the displacement sensor, low test efficiency and high cost; the relative displacement measurement method proposed in this article, only need to use a general acceleration sensor to collect the vibration acceleration signal of the measured part, then filter and integrate the acceleration signal to obtain the displacement of the tested part, and finally obtain the relative displacement of the tested part through arithmetic calculation, high test efficiency and low cost. At present, the relative displacement measurement method of integral method has been well verified and applied in the development of vehicle NVH performance. References | Related Articles | Metrics

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Gasoline Engine Tilt Test Research WANG Libin 2022, 47(1): 136-140.  DOI: 10.16638/j.cnki.1671-7988.2022.001.031 Abstract ( )   PDF (2831KB) ( )   The purpose of engine tilt test is to verify whether the state of lubrication system and crankcase ventilation system in front and rear tilt, left and right tilt and the combination of them meet the requirements, and analyze these cases separately and synthetically. Taking a three cylinder gasoline engine as an example, this paper introduces the test purpose, test preparation, instrument and equipment, test method, data result analysis, etc. By tilting the engine to a certain angle to simulate the oil level and angle of the oil pan when the vehicle is accelerating, turning and braking, the test evaluates whether the engine lubrication system and crankcase ventilation system can meet the normal working requirements of the engine under similar vehicle conditions, so as to provide reference for the design and verification of the engine. References | Related Articles | Metrics

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Fault Diagnosis of DCT in Steady State Durability Test WU Youxing 2022, 47(1): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2022.001.032 Abstract ( )   PDF (2643KB) ( )   Some parts may have early failure during the bench durability test, resulting in test failure, and the associated parts also have the risk of secondary damage. In order to reduce the cost of R&D and test, the test instrument specially used for powertrain system in the development stage can monitor the change of test data in the test process, quickly identify the abnormal points in the initial stage of transmission assembly failure, and accurately determine the specific location of failure through data analysis, so as to ensure that the transmission assembly will not be damaged due to fatigue failure of individual parts machine failure. The results show that: with the help of auxiliary equipment, monitoring and analyzing the data transformation in the test process, the fault can be found early, and the failure parts can be accurately predicted, then the decision can be made quickly, a lot of test costs can be saved and the verification cycle can be shortened. References | Related Articles | Metrics

Process and Equipment

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Research on Hydroforming of Rectangular Section Pipe Fittings LIU Bangxiong 2022, 47(1): 145-148.  DOI: 10.16638/j.cnki.1671-7988.2022.001.033 Abstract ( )   PDF (3068KB) ( )   Compared with circular tubular parts, hydroforming rectangular section pipe has the advantages of simple process and high forming quality. It has great development potential and application prospect in lightweight forming technology in automobile industry. In order to study the forming ways of hydroforming rectangular section parts, circular pipe fittings are taken as the research object in this paper. The mechanical parameters of the forming material are obtained through experiments, and the stress-strain curve is obtained by universal tensile machine, which is transformed into the real stress-strain curve. An experimental platform was built to study the hydroforming experiment of circular pipe without axial feed, and the key parameters of circular pipe forming and the fillet fitting were obtained. The nonlinear finite element software DYNAFORM is used to calculate the forming process of circular pipe fittings. Through experimental comparison, the results show that the deviation between the experimental and numerical results is less than 5%, and the coincidence rate is high, which verifies the correctness of the finite element model and calculation method in this paper, and provides a necessary reference for engineering application. Keywords: Rectangular section; Hydroforming; Numeral calculations References | Related Articles | Metrics

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Body Welding Spots Quality Digitized Check Research ZHANG Kun 2022, 47(1): 149-152.  DOI: 10.16638/j.cnki.1671-7988.2022.001.034 Abstract ( )   PDF (7535KB) ( )   This paper introduces the scheme of the digitized body welding quality check, the network structure of digitization, the technological innovation and difficulties, and the realized functions, etc. The digital research of welding quality check can achieve the goal of efficiency, speed and intelligence in welding quality inspection; and build a welding quality check digital platform through network technology, big data and industrial internet technology; the welding quality inspection employees can easily enter, intelligent query, get welding quality big data, analyze and improve welding quality; base on the advanced intelligent manufacturing technology to study the digitalization of actual welding quality inspection, strengthen the summary analysis and problem solving of welding quality problems from the big data, to enhance the car welding quality and the ability of intelligent automobile manufacturing. References | Related Articles | Metrics

Automobile Education

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Design of CAN Bus Teaching Platform for New Energy Vehicle Air Conditioner Based on WiFi LI Jiwu 2022, 47(1): 153-158.  DOI: 10.16638/j.cnki.1671-7988.2022.001.035 Abstract ( )   PDF (2294KB) ( )   New energy vehicle CAN bus technology is the core course of new energy vehicle major in colleges and universities. Because of the complexity and abstraction of CAN bus technology, it is very difficult for students to learn. This paper selects the automatic air conditioner of new energy vehicle as the research object, uses WIFI-CAN converter to convert the air conditioner CAN bus data into WiFi data, designs a software to analyze the air conditioner WiFi data in real time, display the air conditioner status, and remotely control the air conditioner through the air conditioner panel on the software interface, which can intuitively demonstrate the automobile CAN bus It can also show the programming process of CAN bus at the source code level, which has great application value for students to master the technology and programming principle of CAN bus. References | Related Articles | Metrics

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Teaching Reform and Practice of Integration of Theory and Practice in the Course of Structure and Maintenance of Pure Electric Vehicles ZHENG Jintang 2022, 47(1): 159-163.  DOI: 10.16638/j.cnki.1671-7988.2022.001.036 Abstract ( )   PDF (1389KB) ( )   In view of the problem that the theoretical teaching is out of step with the practical teaching and it is difficult to link up effectively in the teaching of the new energy automobile technology specialty, the integrated teaching reform of theory and practice is carried out in the core course of Structure and Maintenance of Pure Electric Vehicles, it also puts forward the teaching reform ideas of "four docking" of teaching content and job tasks, teaching environment and job conditions, teaching process and work process, role transformation of school and enterprise. Based on the ICVE platform, this paper constructs the integration of theory and practice teaching on-line and off-line, and protects the course reform by creating the professional integration teaching area, the double-qualified teaching team and the course assessment and evaluation system, thus to promote the students fault analysis, maintenance planning and the comprehensive application of vehicle maintenance ability training. References | Related Articles | Metrics

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Exploration and Analysis of the Combination of Online and Offline Teaching Modes for Automobile Majors —Take the Teaching Process of Car Lighting Failure as an Example ZHANG Meihong 2022, 47(1): 164-168.  DOI: 10.16638/j.cnki.1671-7988.2022.001.037 Abstract ( )   PDF (2833KB) ( )   This paper is based on a current teaching situation that there is a large number of students majoring in automobile, while there is little automobile equipment. In order to improve the educational quality, this article intends to use a variety of mobile phone software such as Xuexitong, WeChat, mobile phone screencast, Seewo mobile assistant and Kuaishou live broadcast to explore the combination of online and offline teaching methods. Through this application of educational innovation, the problem of little equipment and few field could be relieved. Also, the attention of students could be turned back from games to lessons because of the various teaching activities. The Internet broadcast teaching could solve the problem of sick students unable to attend class, benefit the distance education during epidemic situation, then the offline-education mode of "suspend classes while continue to learning". References | Related Articles | Metrics

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Cultivation of College Students' Innovative Practical Ability Guided by Mechanical Innovative Design Competition ZHANG Jutao 2022, 47(1): 169-173.  DOI: 10.16638/j.cnki.1671-7988.2022.001.038 Abstract ( )   PDF (2538KB) ( )   Mechanical innovation design competition is a discipline competition for mechanical majors to cultivate students' innovation ability, engineering practice ability and teamwork spirit. At present, the innovation and practice ability of college students is poor, by analyzing the problems existing in the current cultivation of college students' practical ability, reform the theory teaching, reform the practice teaching and establish the system safeguard, this paper puts forward the construction of a competitionoriented teaching system, in which students' interests in active learning will be aroused, and the innovation ability together with teamwork sprit will be improved, and it can be used for reference for engineering students to cultivate their ability of innovation and practice. References | Related Articles | Metrics

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Research and Practice of Teaching Mode Oriented by Vocational Post Competency HUANG Chunmei 2022, 47(1): 174-177.  DOI: 10.16638/j.cnki.1671-7988.2022.001.039 Abstract ( )   PDF (1087KB) ( )   The article is based on the research and practice of teaching mode oriented by vocational post competency.Analyze and practice in terms of teaching reform background, theoretical basis, selection of teaching projects, construction of teaching scenarios for auto repair positions, and project implementation.And in the implementation of the pilot class, give full play to the core role of practical teaching in vocational education, so that students can quickly meet the needs of corporate positions, and demonstrate that this teaching model is beneficial to improving teachers' teaching skills, stimulating students' interest in learning, and enhancing students' vocational post competency and occupational accomplishment. References | Related Articles | Metrics

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Research on the Integration of Ideological and Political Education into the Course Inspection and Maintenance of Automobile Transmission System KANG Xuezhong 2022, 47(1): 178-181.  DOI: 10.16638/j.cnki.1671-7988.2022.001.040 Abstract ( )   PDF (1204KB) ( )   In this paper, taking Inspection and Maintenance of Automobile Transmission System an example, we explore how to dig and refine the "ideological and political elements" in the highly professional automobile courses in higher vocational colleges, and explain how to organically integrate them into the teaching process of professional courses. The research and analysis of this paper shows that by analogy, some good and relevant "ideological and political elements" can be excavated in automobile professional courses, and they can be organically integrated into professional course teaching, so as to overcome the mechanical and rigid implantation of "ideological and political elements" and realize the educational function of "curriculum ideological and political". References | Related Articles | Metrics

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Exploration and Practice of Improving the Development Ability of New Energy Vehicle Professional Service Local Industry DONG Wei 2022, 47(1): 182-185.  DOI: 10.16638/j.cnki.1671-7988.2022.001.041 Abstract ( )   PDF (1004KB) ( )   The ability to professionally serve the development of local industries is a reflection of the school building level and talent training quality of vocational colleges. With the settlement of the first pure electric "license" in Sanmenxia, The new energy vehicle industry in Sanmenxia has put forward a strong demand for the training of relevant highly skilled professionals. However, at present, vocational colleges are still insufficient to actively connect with automobile pillar industries, Problems such as disconnection between automobile specialty setting and industrial demand. The school running mode of industry education integration and school enterprise cooperation is the successful experience of vocational education reform. Local vocational colleges should be based on the transformation and development of regional industries, establish a talent training mode of "post leading and project driving", take the construction of automobile professional group as the guide, optimize the professional structure, stick to the industry, promote the connection between schools and enterprises, strengthen the reform of professional courses Build a "double qualified" teacher team, promote the "double main body" education of schools and enterprises, cultivate highly skilled talents urgently needed by industrial enterprises, and help industrial transformation and development. References | Related Articles | Metrics

Standards Regulations Management

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Research on Energy Management Strategy of PHEV ZHANG Siyu 2022, 47(1): 186-188.  DOI: 10.16638/j.cnki.1671-7988.2022.001.042 Abstract ( )   PDF (2048KB) ( )   For a series plug-in hybrid electric bus, this paper establishes the corresponding numerical model of the power components of vehicle based on MATLAB. Under the Chinese typical city bus driving cycle, the DP strategy based on global optimization was established, and the energy consumption cost was compared with that of the CD-CS strategy and PMP strategy. The results show that: (1) The SOC fluctuates within a certain range based on CD-CS strategy, and the SOC trajectories of the DP strategy and the PMP strategy change approximately linearly. (2) The energy consumption cost of CD-CS strategy is 22.68% higher than that of DP strategy, and the energy consumption cost of PMP strategy is 0.30% higher than that of DP strategy. The DP strategy and the PMP strategy can reasonably allocate energy sources to achieve global optimization. But the calculation amount based on the DP strategy is larger than PMP strategy. References | Related Articles | Metrics

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The Procedure and Method of Measurement Confirmation CHEN Zhen 2022, 47(1): 189-192.  DOI: 10.16638/j.cnki.1671-7988.2022.001.043 Abstract ( )   PDF (1272KB) ( )   Metrological confirmation is an important part of the measurement management system. Through metrological confirmation, we can judge the conformity of measurement equipment and determine whether the output data of measurement equipment is accurate and reliable, which is of great significance to achieve the quality goal of products. Therefore, it is important to determine a procedure and method of metrological confirmation. Combined with author’s many years of experience in metrological work, this paper expounds the significance of measurement confirmation, the identification of measurement requirements, measurement detection and verification and result judgment, and forms a complete set of procedures and methods for measurement confirmation to guide the implementation of measurement confirmation. References | Related Articles | Metrics

Overview

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Research Status of Influence of Liquid Sloshing in Tank on Rollover Stability of Semi-loaded Tank Truck JIA Xinhong 2022, 47(1): 193-196.  DOI: 10.16638/j.cnki.1671-7988.2022.001.044 Abstract ( )   PDF (1069KB) ( )   With the characteristics of heavy load, high transportation efficiency and low economic cost, semi-trailer liquid tank truck has gradually become the main force of road transportation of liquid goods in China. The coupling effect between the liquid sloshing in the tank and the vehicle movement greatly reduces the driving stability of the vehicle, and makes the liquid tank vehicle prone to yaw, rollover and other problems. This paper mainly summarizes and analyzes the common research methods of liquid sloshing in the tank and the common control strategies to prevent the rollover of liquid tank truck, so as to provide a certain theoretical basis for the study of the rollover stability of semi-trailer liquid tank truck. References | Related Articles | Metrics

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Research and Application of Spray Liquid Jet Model HU Dong 2022, 47(1): 197-200.  DOI: 10.16638/j.cnki.1671-7988.2022.001.045 Abstract ( )   PDF (1451KB) ( )   Spray atomization is a process in which liquid enters into a gas environment through a nozzle, and it is broken down into droplets through the interaction of gas and liquid, which involves complex energy exchange, momentum exchange and heat transfer process. Fuel atomization is an important link in the combustion process of internal combustion engine. Good atomization effect can promote the full mixing of fuel particles and air, so as to improve the thermal efficiency of combustion, and then improve the power performance, economy and emission of internal combustion engine. Due to the different physical structure of the spray liquid through the nozzle, the shape of the jet formed is also different. The main jet forms include plane jet, cylindrical jet and annular jet. In this paper, the three kinds of jet forms are studied, and the deep penetration analysis is carried out from the mechanism of the jet fragmentation. By introducing the physical equation and the theory of the surface wave of the jet, the liquid jet phenomenon is transformed into a mathematical model, and the key factors affecting the atomization effect are explored, thus promoting the development of the spray discipline. References | Related Articles | Metrics

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Application of Black Box Testing Technology in Embedded Software Testing WANG Yang 2022, 47(1): 201-204.  DOI: 10.16638/j.cnki.1671-7988.2022.001.046 Abstract ( )   PDF (1591KB) ( )   In recent years, the scale and complexity of embedded software have increased sharply. Especially in the fields of national defense, rail transit, automobile, civil aviation and industrial control, users have stricter requirements on the quality of embedded software, and their tolerance for defects of embedded software has become lower and lower. Therefore, how to effectively improve the quality of embedded software becomes an urgent problem to be solved. Taking the air conditioning control module of a new energy vehicle control strategy as an example, this paper analyzes how the black box test technologies such as equivalence class partition method, boundary value analysis method and cause and effect diagram method are integrated and applied in the design of embedded software test cases; it expounds the organic integration of different black box test methods, which can effectively and orderly design a group of functional test cases with high reliability and strong execution, thus improving the test efficiency and ensuring the test confidence and software quality. References | Related Articles | Metrics

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Analysis on the Application of Electronic Diagnosis in the New Technology of Modern Automobile Maintenance LI Ming 2022, 47(1): 205-208.  DOI: 10.16638/j.cnki.1671-7988.2022.001.047 Abstract ( )   PDF (1024KB) ( )   The continuous development of economy not only brings great changes to people's daily life, but also drives the forward development of science and technology. All walks of life have obtained considerable benefits from it, and the automobile industry is no exception. The application of electronic diagnosis technology and electronic diagnosis system in modern automobile maintenance is not only the actual demand of current people, but also the development trend of the industry in the future. The application of electronic diagnosis technology and system can effectively improve the work efficiency and quality of automobile maintenance, and also inject new vitality and vitality into the development of automobile maintenance industry. The following article will analyze the application of electronic diagnosis in the new technology of modern automobile maintenance. References | Related Articles | Metrics