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15 February 2022, Volume 47 Issue 3 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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Performance Analysis of Hydrogen Fuel Cell Air Compressor Based on Fluent ZHENG Jinfeng 2022, 47(3): 1-4.  DOI: 10.16638/j.cnki.1671-7988.2022.003.001 Abstract ( )   PDF (1370KB) ( )   Aiming at a hydrogen fuel cell air compressor, a two-dimensional model was established, and then import it into ICEM CFD software for grid division. Then, based on the standard k-ε model and Fluent 18.0 software, the internal flow field of a hydrogen fuel cell air compressor was numerically simulated by SIMPLEC algorithm, and the internal flow phenomena and laws of the air compressor were analyzed. Finally, the simulation results are compared with the reference results to verify the accuracy of simulation of air compressor. References | Related Articles | Metrics

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Battery Safety Diagnosis Based on Improved DBSCAN ZHOU Yaf 2022, 47(3): 5-9.  DOI: 10.16638/j.cnki.1671-7988.2022.003.002 Abstract ( )   PDF (768KB) ( )   The performance difference between cells is one of the main factors affecting the safety of power battery pack. In order to identify the batteries with poor consistency, that is, batteries that are more prone to risk. This paper improves the conventional DBSCAN algorithm on the basis of its sensitivity to input parameters. An improved DBSCAN algorithm based on data distribution characteristics is proposed to determine the parameters of MinPts and Eps adaptively. In this paper, the improved DBSCAN algorithm is used for battery safety diagnosis, and related experiments are designed and verified by using battery charge and discharge data. The verification results show that the improved algorithm proposed is effective in identifying dangerous batteries. References | Related Articles | Metrics

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Review on the Development of High-Speed Electric Drive Systems for Pure Electric Vehicles DU Keqiang 2022, 47(3): 10-16.  DOI: 10.16638/j.cnki.1671-7988.2022.003.003 Abstract ( )   PDF (6419KB) ( )   This paper summarizes the development state of high-speed electric drive systems for pure electric vehicles, and sums up high-speed permanent magnet synchronous motors, the integrated design of motors and reducers and the battery life and safety performance in electric drive systems. The key technologies of stator and rotor structure and thermal system design of high-speed permanent magnetic synchronous motors are analyzed. At last, the development trends of pure electric vehicle drive systems are prospected. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Driving Behavior Evaluation for Line-haul Transportation Truck Based on Entropy Weight TOPSIS Model LI Chao 2022, 47(3): 17-21.  DOI: 10.16638/j.cnki.1671-7988.2022.003.004 Abstract ( )   PDF (802KB) ( )   With the increasing price of fuel and labor costs, people focused on the research of internet of vehicles to improve transportation industry’s intelligent management for cost control. High resolution data were collected from internet of vehicles and eight indicators were selected for driving behavior evaluation both from economy and safety. Then by combining entropy weight methods and TOPSIS model, the driving behavior of the drivers of line-haul transportation truck could be objectively and effectively evaluated. This method could help transport companies to organize eco-driving training and reduce energy consumption. With the in-depth research of autonomous truck driving, this findings and analysis could also benefit for autonomous speed management strategy. References | Related Articles | Metrics

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Simulation of Multi-arc Path Automatic Parallel Parking Based on Fuzzy Control LAN Guilong 2022, 47(3): 22-25.  DOI: 10.16638/j.cnki.1671-7988.2022.003.005 Abstract ( )   PDF (1774KB) ( )   In recent years, intelligent automatic parking technology has continued to develop.An automatic parallel parking method based on fuzzy control theory is proposed to solve the problems of excessive curvature of parallel parking trajectory, non-continuous curvature, severe parking starting position and posture requirement of vehicle body. In this paper, the turning radius is taken as the output of the fuzzy controller, and the vehicle is put into the garage according to the continuous tangent arc path. The simulation model is established in MATLAB. The simulation results show that this method can realize automatic parallel parking with small and continuous trajectory curvature and small parking start-pose constraint. References | Related Articles | Metrics

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Station Positioning Method of Intelligent Bus Based on GPS and RFID Technology CHENG Chao 2022, 47(3): 26-29.  DOI: 10.16638/j.cnki.1671-7988.2022.003.006 Abstract ( )   PDF (950KB) ( )   Recently, it has become an important research direction to apply intelligent networking technology and autonomous driving technology to urban public transportation. However, real-time vehicle location monitoring, one of the most important foundations of these two technologies, still mainly rely on GPS positioning system. The system is greatly affected by weather and environment, and cannot provide complete and accurate information independently. This paper proposes a multi-technology cooperation and correction methods of GPS and RFID. This technology uses the synergy and correction of GPS and RFID, overcomes the shortcomings of single GPS positioning, has high research significance for improving the accuracy and timeliness of bus station positioning, and realizing early announcement and automatic parking of bus stations. References | Related Articles | Metrics

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Lane Line Detection and Fitting Method Based on Semantic Segmentation Results LIU Jiawei 2022, 47(3): 30-33.  DOI: 10.16638/j.cnki.1671-7988.2022.003.007 Abstract ( )   PDF (2808KB) ( )   This article proposes a lane line detection and fitting method based on the results of semantic segmentation. The detection of ground landmarks such as lane lines is a significant content of the environment perception of autonomous vehicles, which can provide the vehicle with information about the driving area. The vehicle-mounted monocular camera obtains the road images collected during the driving process of the vehicle and sends them to the convolutional neural network for semantic segmentation of lane lines. The segmented binary image containing only lane lines is perspective transformed to obtain a bird's-eye view, the effective lane line pixels are screened, the effective lane line points are polynomial fitting using the least square method, and the left and right lane line polynomial fitting coefficients are output. It can effectively solve the problems of poor environmental adaptability of traditional lane line detection algorithms, weak robustness, and inaccurate detection information for curved lane lines. References | Related Articles | Metrics

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Practical Exploration on Vulnerability Management of Intelligent Connected Vehicles XUE Shihao 2022, 47(3): 34-37.  DOI: 10.16638/j.cnki.1671-7988.2022.003.008 Abstract ( )   PDF (888KB) ( )   With the continuous improvement of automotive intelligence and networking level, the increasing configurations and functions not only improve user experience, but also increase the attack surface and risks of malicious network security attacks on automotive products, which causes the great possibility of network security vulnerabilities. In order to improve the current situation of enterprises which suffer from incomplete vulnerability management systems and lack of vulnerability management platforms, this paper develops a vulnerability management system for intelligent connected vehicles exploring the construction of automobile vulnerability management system, helping automobile enterprises not only avoid relevant legal risks, but also improve their own network security level. References | Related Articles | Metrics

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Title Security Design of OTA Upgrade for Intelligent Connected Vehicle WU Zhi 2022, 47(3): 38-40.  DOI: 10.16638/j.cnki.1671-7988.2022.003.009 Abstract ( )   PDF (966KB) ( )   With the rapid development of the vehicle industry in the direction of intelligence, connectivity, and electrification, the Electronic Control Unit (ECU) is frequently increasing in the automotive system. The updates iterations for the entire vehicle and ECU have been implemented from physical methods to software upgrades of OTA. At present, there are frequent hacking incidents targeting automobiles. As a significant function of intelligent connected vehicles, the OTA function has additionally become a key target of hackers. Attackers use hijacking, tampering, replacing, and other attack methods to attack the OTA upgrade link of the vehicles. This paper proposes a design of a safe OTA upgrade scheme through a security analysis based on the current OTA upgrade architecture of intelligent, connected vehicles to improve the security of the entire process of OTA upgrade. References | Related Articles | Metrics

Design and Research

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Simulation Study on Optimization Design of High Compression Ratio Combustor for Single-cylinder Air-cooled Gasoline Engine QI Pengchong 2022, 47(3): 41-48.  DOI: 10.16638/j.cnki.1671-7988.2022.003.010 Abstract ( )   PDF (4926KB) ( )   Aiming at the problem of fuel economy, an off-road single-cylinder air-cooled 170F gasoline engine is taken as the research object, and high thermal efficiency is the core goal. Simulation software is used to optimize the combustion chamber shape and compression ratio.Simulation software was used to optimize the shape and compression ratio of the combustion chamber. Under the premise of ensuring that no abnormal combustion occurs, CONVERGE is used to establish a simulation model, and the impact of four high compression ratio combustion chambers on engine performance is designed and simulated. Determine the ideal combustion chamber model through specific analysis of the simulation data. The research results show that under the premise of further improvement of its own small strengthening technology, the compression ratio of slight knock can be considered. At this time, the compression ratio is 10.5, the indicated thermal efficiency of the whole machine is increased by 46.61% compared with the original machine, and the theoretical fuel consumption rate is reduced to 252.69 g/(kW·h), which is 31.79% lower than that of the original machine. This kind of combustion chamber improvement method has a good prospect of energy saving and emission reduction. It has a certain application universality on different models of similar machines and has the ability to be practically promoted. References | Related Articles | Metrics

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Optimization Analysis of a Decoupling Suspension Based on Adams YANG Shifeng 2022, 47(3): 49-54.  DOI: 10.16638/j.cnki.1671-7988.2022.003.011 Abstract ( )   PDF (2575KB) ( )   In order to realize the independent adjustment of the pitch stiffness and roll stiffness of the suspension, an optimization analysis of a double wishbone decoupling suspension was carried out in this paper. It used software such as CAXA and UG to determine the initial coordinates of each hard point of the suspension, and built a three-dimensional model. Used Adams/car to simulate the kinematics of the decoupling suspension, studied the influence of the geometric structure of the rocker arm on the transmission ratio and decoupling degree of the suspension, and optimized and checked the geometric mechanism of the rocker arm, and finally used Adams/car insight module to optimize the front wheel positioning parameters of the decoupled suspension. The optimization results showed that the pitch stiffness and roll stiffness of the front suspension had a small correlation, and the wheel parameters changed ideally, which meeted the design requirements. All of it provided a theoretical basis for the decoupling suspension design of the FSAE racing car and had reference significance. References | Related Articles | Metrics

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The Mixed Fleet Vehicle Routing Problem Optimization of Multi-depot Distribution with Time Windows ZHANG Jiarui 2022, 47(3): 55-63.  DOI: 10.16638/j.cnki.1671-7988.2022.003.012 Abstract ( )   PDF (1769KB) ( )   With the continuous development of logistics industry, the number of logistics transportation vehicles is increasing, and the use of traditional fuel vehicle caused a certain pressure to the environment. In recent years, because of the characteristics of energy conservation and environmental protection, logistics electric vehicles have been widely used. However, due to the electric vehicle has to charging for a long time and the development present situation of transportation industry, the electric vehicle is currently not completely replace the traditional fuel vehicle, the two kinds of vehicles will exist in the field of logistics distribution. The open multi-depot distribution vehicle routing problem with fuel vehicle and electric vehicle as distribution vehicles is research topic of this paper. The goal is to minimize total distribution costs, which including carbon emission cost, transportation cost and time window penalty cost. A linear programming mathematical model is established. For the NP-hard characteristic, an improved particle swarm optimization algorithm is designed. The theory of good-point set is employed in the particle swarm optimization algorithm for generating initial population to increase the diversity of particle swarm optimization algorithm. In iteration phase of the particle swarm optimization, in order to achieve the global optimal, the random neighborhood strategy is provided to avoid the particle swarm into local optimum. Finally, a numerical example is designed to test. The results show that the improved particle swarm optimization algorithm is superior to the standard particle swarm optimization algorithm. By analyzing the costs obtained by the two algorithms, it is concluded that the ratio of the total cost obtained by the improved particle swarm optimization algorithm is 5.69% lower than that obtained by the standard particle swarm optimization algorithm, which proves the effectiveness of the improved particle swarm optimization algorithm designed in this paper. The number of traditional fuel vehicle used considering the carbon cost is declined compared to without considering the cost of carbon emissions, and the total cost of open hybrid VRP is less than the cost of closed-loop hybrid VRP. References | Related Articles | Metrics

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Overview of Interior Perceptual Quality Design and Verification DU Maoqing 2022, 47(3): 64-68.  DOI: 10.16638/j.cnki.1671-7988.2022.003.013 Abstract ( )   PDF (3204KB) ( )   With the development of automobile industry, more users pay attention to the perceptual quality, the improvement of perceptual quality in automobile design became more important. Comparison and analysis, this paper combs and discusses the key points of interior perceptual quality design from the aspects of appearance, odor, touch, sound, convenience and comfort. The interior perceptual quality design method is clarified, and the specific design verification and confirmation means, virtual review and real review, especially the interior hard mold verification method. Specific measures are given to improve the perceptual quality design of automotive interior, which enriches the design methods and provides an effective solution for this field. References | Related Articles | Metrics

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Matching Design of Sunroof and Roof of Automobile ZHUANG Jingbiao 2022, 47(3): 69-72.  DOI: 10.16638/j.cnki.1671-7988.2022.003.014 Abstract ( )   PDF (3387KB) ( )   This paper mainly introduces the types, structures and related parameters of automobile sunroofs, focuses on the factors and layout methods that need to be considered in the arrangement of sunroofs, and gives a detailed description of the matching design of sunroofs and roofs. The crosssectional form of the sunroof reinforcement frame is introduced in detail, which provides a valuable reference for the matching design of the sunroof and the roof. References | Related Articles | Metrics

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The Rear Suspension Optimization Analysis for the Vehicle Performance of a Leaf-Spring Car FAN Hongchun 2022, 47(3): 73-78.  DOI: 10.16638/j.cnki.1671-7988.2022.003.015 Abstract ( )   PDF (4504KB) ( )   This paper mainly expounds the rear suspension structure optimization of a successful model. The suspension simulation was carried out by using related software, analyzed theoretically with the advantages and disadvantages of leaf spring structure, vehicle performance comparison, stress strength comparison and other aspects. And then verifying the improvement effect through a variety of road tests and subjective evaluation of the vehicle, so as to confirm whether its performance can meet customer experience requirements. This method has certain reference significance to the research of leaf spring and the optimization analysis of the rear suspension of leaf spring truck. References | Related Articles | Metrics

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Layout of Shock Absorber of a New Energy Vehicle Three-link Integral Axle and DOE Analysis and Optimization of its Bushing Yaw Angle HUANG Shengji 2022, 47(3): 79-84.  DOI: 10.16638/j.cnki.1671-7988.2022.003.016 Abstract ( )   PDF (2946KB) ( )   This paper discusses the basic structure of three-link integral bridge suspension and its advantages in short wheelbase new energy vehicle, compares the difference of shock absorber layout form of three-link integral bridge suspension of transmission oil vehicle and new energy vehicle, analyzes the cause of the bushing yaw angle is too large when the shock absorber of a new energy vehicle is loaded with roll and single side deep pit. In this paper, Adams/Car is integrated with Isight software to carry out sensitivity analysis on the yaw angle of shock absorber bushing. According to the analysis results, the suspension hard point which is the most sensitive to the yaw angle of shock absorber bushing is found, and the optimization method of the yaw angle of shock absorber bushing is found based on the vehicle performance, spatial layout and structural design, so as to eliminate the risk of shock absorber oil leakage. It provides reference for the design and development of new energy vehicle three-link integral bridge rear suspension. References | Related Articles | Metrics

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Design and Research of Automotive AFS Lighting Control System YU Hongyan 2022, 47(3): 85-89.  DOI: 10.16638/j.cnki.1671-7988.2022.003.017 Abstract ( )   PDF (989KB) ( )   In order to solve the trouble of driving lighting at night, combined with the continuous innovation of automobile electrical control technology, this paper improves the design of the traditional AFS lighting system, analyzes the function and composition of the control system, designs the hardware circuit and software control program of the control system, and realizes the adaptive intelligent control of the headlamp, so as to meet the needs of various driving environments. References | Related Articles | Metrics

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Design of Integrated Door Control Module System YANG Shanshan 2022, 47(3): 90-94.  DOI: 10.16638/j.cnki.1671-7988.2022.003.018 Abstract ( )   PDF (4807KB) ( )   With the development of social science and technology, the demand for intelligent vehicle configuration is becoming more and more intense. In the face of the increasingly complex design of electronic control for vehicle doors, the original way of adding a new function is to add a controller, which not only increases the degree of control complexity, the wiring harnesses are also more complex and can not be functionally diversified due to load constraints. Therefore, the main engine factories at home and abroad have taken the distributed control mode as the first choice of the whole vehicle architecture. In this paper, the left and right front door control modules are used to control the various functional requirements of the side door, and through the design of the power supply and signal acquisition hardware of the module, the software system structure and the software design scheme of the window anti-clamp, a distributed control method is constructed to improve the vehicle performance and reduce the vehicle cost effectively. References | Related Articles | Metrics

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Structural Optimization Design of Automobile Door Handle LIAN Wenxiang 2022, 47(3): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2022.003.019 Abstract ( )   PDF (3478KB) ( )   The door handle is an important functional and safety part of the automobile. In order to meet the structural compactness requirements and light weight of the door handle, the layout design is carried out for the peripheral and opening height of the exterior handle, and the main parameters such as the matching clearance and opening height of the peripheral of the exterior handle are designed. According to the process of force transfer, the stress analysis of key parts is carried out, and the opening force of the handle directly acting on the car door is calculated. Using the virtual simulation software ANSYS to carry out the simulation analysis and secondary optimization design of the exterior handle structure, and get the optimization results. On the premise of not changing the structural rigidity, hardness and the practicability of the door handle, the maximum stress concentration point is transferred backward by the contact point of the handle hook which is easy to cause fracture and deformation, and the mass is reduced by 20%～30% at the same time, so as to effectively reduce the manufacturing cost of the door handle under the condition of ensuring safety. It will play a reference role in the research of the structural optimization and engineering application of the door handle of the automobile. References | Related Articles | Metrics

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General Layout Design of a RHD Cab for Off-road Vehicle FENG Ce 2022, 47(3): 100-103.  DOI: 10.16638/j.cnki.1671-7988.2022.003.020 Abstract ( )   PDF (1600KB) ( )   According to the off-road vehicle customer demands in a RHD (right hand drive) country, this paper introduces the development of a RHD cab based on a LHD (Left hand drive) off-road vehicle cab. This paper introduces the general arrangement design of RHD off-road vehicle cab. First of all, the driver's binocular obstacle angle and the rearview mirror field of vision were checked, and the rear-view scope, then checking the area of wiper scrapping, all check results meet the national standards, and the dash board space in front of the driver is arranged. Finally drawing the general layout of RHD cab. References | Related Articles | Metrics

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Application of Parametric Design for Stiffness Performance of Section Structure HUA Rui 2022, 47(3): 104-108.  DOI: 10.16638/j.cnki.1671-7988.2022.003.021 Abstract ( )   PDF (2175KB) ( )   In this paper, based on the B pillar section of a vehicle, the process of calculating the stiffness performance of complex section by Hypermesh software is introduced in detail. By defining the size parameter as the design variable and the performance parameter as the response, the functional relationship between the stiffness performance and sizes of complex section is established by using experimental design and polynomial fitting. Compared with the actual section performance, the average error of the fitting calculation result is less than 5%. Based on the function relationship, the rapid evaluation of stiffness performance of complex section without the finite element mesh is realized, and it provides support for establishing the relationship between the size and performance of section and the performance of body in white. References | Related Articles | Metrics

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Design and Analysis of Seal Internal Waist GAO Dan 2022, 47(3): 109-111.  DOI: 10.16638/j.cnki.1671-7988.2022.003.022 Abstract ( )   PDF (2051KB) ( )   The unreasonable design of seal internal waist not only affects the assembly performance, but also affects the glass lifting system. By studying the seal internal waist of vehicles, and using the finite element analysis software to assist the design of seal internal waist structure, the external and functional requirements can be achieved, providing reference for the future seal internal waist design. References | Related Articles | Metrics

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Design and Research of Deflated Driving System of Heavy Off-road Vehicle XI Wenjin 2022, 47(3): 112-115.  DOI: 10.16638/j.cnki.1671-7988.2022.003.023 Abstract ( )   PDF (3674KB) ( )   The driving environment of heavy off-road vehicles is harsh, and bumpy roads and sharp objects can easily cause fatal damage to the wheels and tires. If a tire burst or loss of pressure occurs, it will bring hidden dangers to driving safety. In order to solve the above problems, the method of deflation and driving of heavy off-road vehicles was researched, and a deflation and driving system suitable for heavy off-road vehicles was designed.Through the material selection and structural design of the tire inner support body, and the reasonable design of the structure that matches the rim, the pneumatic tire using this system deflate can not only ensure that the vehicle continues to travel for a certain distance, but also does not affect the driving performance of the vehicle. The relevant test verification of the system shows that the performance of the system is reliable and it can meet the requirements of deflation and driving. References | Related Articles | Metrics

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Program Design of Intelligent Freight Car ZHANG Xinfeng 2022, 47(3): 116-119.  DOI: 10.16638/j.cnki.1671-7988.2022.003.024 Abstract ( )   PDF (1657KB) ( )   The program design is an important step to realize the intelligentization of freight car. This paper realizes the functions of vehicle perception, prediction, positioning, route searching, planning and control through module programming of intelligent transportation truck. Planning module is the core module, according to the actual situation to make lane line keeping, overtaking, stop, left turn, right turn, parking and other behavior decisions, respectively write the execution program of each behavior, call the corresponding program when the decision, realize the intelligent truck program design. Simulation results show that the design is effective. References | Related Articles | Metrics

Testing and Experiment

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Performance Simulation Analysis of Hydraulic Interconnected Suspension with Different Structures Based on AMESim YU Yifan 2022, 47(3): 120-126.  DOI: 10.16638/j.cnki.1671-7988.2022.003.025 Abstract ( )   PDF (3100KB) ( )   In this paper, aiming at the hydraulic interconnected suspension system of cross and reverse connection, longitudinal interconnection and transverse interconnection, the working principle of various suspension forms is firstly described, and then the simulation models of various interconnection structures and vehicle vibration models are established by AMESim software. Finally, the simulation analysis of vehicle ride comfort and handling stability is conducted. The vertical acceleration, suspension dynamic stroke, body roll Angle and tire dynamic load of different structure interconnected suspension and traditional non-interconnected suspension were compared and analyzed The analysis results show that the cross-anti-connected hydraulic suspension has better comfort and stability, It is helpful to improve the comfort and stability of cars. References | Related Articles | Metrics

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Simulation Verification of Control Strategy of Automatic Emergency Braking System ZHEN Yajing 2022, 47(3): 127-130.  DOI: 10.16638/j.cnki.1671-7988.2022.003.026 Abstract ( )   PDF (1374KB) ( )   In order to assist the driver in longitudinal collision avoidance or reduce the damage caused by the collision in dangerous situations, a hierarchical braking control strategy that considers the actual braking process and the braking behavior of the driver is proposed. Relevant parameters are obtained through experiments. According to the AEB test conditions and evaluation indicators of the new car evaluation standard, the test scene is built and the new car AEB function is evaluated. The simulation results show that the AEB control strategy can reach the standard of AEB function in the new car evaluation procedure under all working conditions. The proposed hierarchical braking control strategy has certain reference value. The simulation model can easily change the parameters to be suitable for different vehicles. It can be used as a simulation tool for evaluating the AEB function of a new car, reduces test costs and has practical value. References | Related Articles | Metrics

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Ride Comfort Evaluation Based on Heart Rate Variability WANG Yu 2022, 47(3): 131-134.  DOI: 10.16638/j.cnki.1671-7988.2022.003.027 Abstract ( )   PDF (1336KB) ( )   The feasibility of heart rate variability (HRV) is studied to evaluate ride comfort in the standing and sitting states of passengers on the basis of the traditional evaluation of ride comfort. Vibration acceleration signals in the X, Y, and Z directions at the selected position of the tested vehicle and physiological signals of standing posture and sitting posture were collected. Signals were processed by different data processing methods. The corresponding indexes was obtained by combining the subjective evaluation of tested passengers. The study showed that HRV analysis can be used as a supplement for the evaluation of traditional ride comfort. References | Related Articles | Metrics

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Research on Ice Control Method of Automobile Evaporator GE Sai 2022, 47(3): 135-138.  DOI: 10.16638/j.cnki.1671-7988.2022.003.028 Abstract ( )   PDF (1372KB) ( )   Aiming at a certain type of automobile, the phenomenon of evaporator icing is reproduced through road test, and the control method of evaporator icing is studied accordingly. It is found that the evaporator icing is related to the position of the temperature controller and the setting parameters of the temperature controller. During the road test, by changing the position and parameter setting of the temperature controller, collecting relevant data of the air conditioning system at the same time, and selecting the most appropriate parameter setting of the temperature controller, the evaporator surface can be effectively prevented from icing and the comfort and reliability of the air conditioning system can be improved. In this way, the influence law of temperature controller parameter setting on each measurement parameter is summarized to avoid evaporator icing, which is very important for the matching of vehicle air conditioning system. References | Related Articles | Metrics

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Dynamic Interface of Trunk Lid Based on Transient Method ZHENG Xuan 2022, 47(3): 139-142.  DOI: 10.16638/j.cnki.1671-7988.2022.003.029 Abstract ( )   PDF (3661KB) ( )   Trunk lid in the process of driving under the action of road excitation load vibration，when the amount of vibration exceeds the trunk cover and car identity seam distance, there will be interference, resulting in the paint film crack. In this paper, the transient response of the truck cover is analyzed and optimized by finite element analysis. Through bench test and road test, the scheme is verified to be effective, which provides a theoretical basis for the design and development of the suitcase lid, and improves the design specification of the suitcase lid. References | Related Articles | Metrics

Process and Equipment

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Study on “6+2” Flexible Expansion of BIW Framing System XU Chao 2022, 47(3): 143-146.  DOI: 10.16638/j.cnki.1671-7988.2022.003.030 Abstract ( )   PDF (2917KB) ( )   This article based on a proposal of “5+1” framing system. By evaluating the floor loading capacity and optimizing the steel structure to open the second and the third row X-direction storage position, which reserved 6+2 expansibility in the future. Multiple vehicle styles can be changed flexibly without increasing the site area, which saves the process area and meets the requirement of eight modes Launch production. It also can solve the 8 models online low operation efficiency issue at the same time through framing system with new concept、new structure、new process. It has brought significant benefits to the reliable manufacturing of automobile welding framing system with high JPH, high precision and high efficiency, and has made due contributions to the intelligent manufacturing of automobile industry. References | Related Articles | Metrics

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Analysis of Bolt Selection and Tightening Technology in Vehicle Assembly YANG Jiankang 2022, 47(3): 147-151.  DOI: 10.16638/j.cnki.1671-7988.2022.003.031 Abstract ( )   PDF (2117KB) ( )   In the body assembly process, bolt tightening is the most widely used assembly process, and the effectiveness and reliability of tightening is the focus of the main engine factory. Through the analysis of bolt selection, bolt tightening connection principle, tightening torque, tightening connection mode and other aspects, this paper reflects the importance of bolt tightening technology to vehicle safety, and is closely related to the stability and safety of the later body structure. It is also pointed out that the selection of bolts and the check of tightening process should be carried out in parallel and keep pace with the development of the whole vehicle, so as to ensure that it plays a positive role in improving the quality, reducing the cost and shortening the time. References | Related Articles | Metrics

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Study on Assembly Process Optimization of Two Fixed Point Steering Gear WANG Feilong 2022, 47(3): 152-155.  DOI: 10.16638/j.cnki.1671-7988.2022.003.032 Abstract ( )   PDF (5111KB) ( )   This paper studies the influence of the installation size and structure of the two-point steering gear of McPherson front suspension on the whole vehicle assembly. In the actual production process, due to the long distance between the two mounting points and the flatness difference on the mounting surface of the subframe, a certain assembly stress will be formed in the assembly process. In order to reduce or eliminate the influence of this assembly stress on the change of front wheel toe-in and vehicle deviation, its structure is analyzed and an optimization scheme of assembly process is proposed through scientific size calculation method. Through the verification of a mass of data in actual production, it can effectively reduce the deviation caused by the change of front wheel toe-in. References | Related Articles | Metrics

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Numerical Analysis of Hydroforming in a Vehicle Subframe LIU Bangxiong 2022, 47(3): 156-159.  DOI: 10.16638/j.cnki.1671-7988.2022.003.033 Abstract ( )   PDF (1862KB) ( )   Taking the subframe as the research object, the bending die radius and die size are determined by CAE software. Six bending processes are designed, and the numerical calculation of the bending process is carried out. The results show that there is no damage and wrinkling, and the forming effect is good. It provides a useful reference for the research of subframe forming. References | Related Articles | Metrics

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Working Principle and Assembly Application of Integrated Air Handling Unit HAN Tao 2022, 47(3): 160-163.  DOI: 10.16638/j.cnki.1671-7988.2022.003.034 Abstract ( )   PDF (2903KB) ( )   Commercial vehicle industry both at home and abroad, most of the braking system function need medium to achieve through the air, the air through the air intake system into the air compressor piping, need air handling unit module for air filter, oil removal of impurities, in addition to water after drying, can meet each valve type brake system and components used, in order to realize the vehicle brake system related functions; Integrated air handling unit compared with the traditional non integrated air handling units, small size, easy to assemble, cost reduction, better for the processing performance of the air medium, this article will from the architecture of the integrated air handling unit is analyzed and introduced, and from the aspects of total assembly process on its application in the assembly process system in this paper. References | Related Articles | Metrics

Automobile Education

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Teaching Reform and Practice of Automobile Electric Appliance and Electronic Control Technology Course Based on Achievement-oriented Idea YIN Wenrong 2022, 47(3): 164-169.  DOI: 10.16638/j.cnki.1671-7988.2022.003.035 Abstract ( )   PDF (1885KB) ( )   Automobile electrical and electronic control technology is an important core course of automobile major, which supports the structure of students' knowledge of automobile electrical and electronic control, and cultivates students' practical ability of automobile electrical and electronic control maintenance. Through investigation and research of the students and teachers in Shandong Huayu Institute of Technology, the analysis of the current problems existing in the teaching of school-based courses, introduced OBE concept, teaching content and teaching of this course is optimized, based on the concept of OBE classroom teaching design thinking, build based on the concept of OBE learning evaluation system, and the practical application, has obtained certain achievements, for other courses teaching reform has practical guiding significance. References | Related Articles | Metrics

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Design of Comfortable Can-Bus Teaching Bench Based on the Car of Magotan B8 HOU Guoqiang 2022, 47(3): 170-177.  DOI: 10.16638/j.cnki.1671-7988.2022.003.036 Abstract ( )   PDF (4788KB) ( )   In order to meet the needs of course learning and competition preparation for students majoring in automobile repair in higher vocational colleges, improve students' Can-bus fault detection and diagnosis ability, so as to further improve the quality of talent training. Analyzed the current situation and problems of domestic automobile Can-bus teaching bench products, deeply studied the Bus control technology of Magotan B8 car with Tianjin Zhongqi Hengtai Education Technology Co., Ltd., then developed the comfortable Can-bus teaching bench and supporting practical teaching software of Magotan B8 car. The training platform introduces computer information technology into course teaching, which can realize the functions of principle cognition, signal analysis and fault diagnosis, and help the organic unity of theoretical teaching and practical teaching. At the same time, the problem of inconvenient detection caused by location in the real vehicle is solved, and the loss and damage to the real vehicle in practical operation are reduced. References | Related Articles | Metrics

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Curriculum Resource Development of Intelligent Connected Vehicle Environment Sensing Sensor Technology JIANG Feng 2022, 47(3): 178-181.  DOI: 10.16638/j.cnki.1671-7988.2022.003.037 Abstract ( )   PDF (1847KB) ( )   As a new industry in the whole automotive field, the intelligent connected vehicle, driven by the "1+X" certificate system, is bound to bring great changes to the automotive major in vocational colleges. Based on the analysis of the reasons for the course resource development of intelligent connected vehicle environment sensing sensor technology, this paper puts forward the idea of the whole process of course development from the three aspects of preliminary research, teaching resource development and teaching implementation and evaluation, and sums up the specific training projects of the course, so as to promote the automotive specialty of vocational colleges to integrate with the times. References | Related Articles | Metrics

Standards Regulations Management

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Development and Application of Data Management Platform for Material Performance WANG Li 2022, 47(3): 182-185.  DOI: 10.16638/j.cnki.1671-7988.2022.003.038 Abstract ( )   PDF (2007KB) ( )   Material performance parameters are not only the basis of product design simulation in the R& D stage, but also the guarantee of final service performance of products. Through the research on the material data management system and development trend, based on the current popular B/S architecture, the MVC layered design mode is adopted to develop the full life cycle management platform system for material data release, analysis, application and abolition, which can support material data management, comparative analysis, and output the material card directly used by the analysis software, Realize seamless connection with engineering analysis. The material performance data management platform has good practical value in material data management and application. References | Related Articles | Metrics

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Current Situation Analysis on Innovation and Entrepreneurship of Sheet Metal and Painting at Home and Abroad LI Shujun 2022, 47(3): 186-190.  DOI: 10.16638/j.cnki.1671-7988.2022.003.039 Abstract ( )   PDF (1074KB) ( )   Sheet metal and coating is an important part of the automotive after-sales market. In order to understand the current situation of sheet metal and coating innovation and entrepreneurship at home and abroad, this paper uses the methods of questionnaire survey, field investigation and literature research, and draws the following conclusions: sheet metal and coating equipment products are more environmentally friendly and convenient, the process is more safe and efficient, and the production management is more intelligent and data-based, the treatment of three wastes in production is more green and environmentfriendly. Employees make their own equipment and tools at work to make the operation easier. Through the investigation of entrepreneurship in sheet metal and coating industry, it is found that the chain of rapid repair of automobile sheet metal and coating has developed rapidly, and the customer loyalty and satisfaction have increased steadily; B&P repair shop has both opportunities and challenges to survive in the cracks of after-sales maintenance market; the innovation and entrepreneurship education of sheet metal spraying in technical colleges has been gradually carried out. References | Related Articles | Metrics

Overview

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Hybrid Electric Vehicle Industry Development Status and Trend WU Meilin 2022, 47(3): 191-195.  DOI: 10.16638/j.cnki.1671-7988.2022.003.040 Abstract ( )   PDF (2247KB) ( )   Hybrid Electric Vehicle combines traditional drive system and energy storage system, using internal combustion engine and electric motor to drive the vehicle. It is significant for the transition from traditional vehicles to battery electric vehicles. Under the background of the global explosion of electric vehicles, hybrid electric vehicles will become an important part of the future energy saving and emission reduction vision. discussed the development status of the hybrid electric vehicle industry in recent years, Introduced several new types of hybrid technology, analyzed and studied the technical advantages and disadvantages of hybrid electric vehicles, pointed out some of the current problems faced by the hybrid electric vehicle industry, and prospected the future development of hybrid electric vehicles. References | Related Articles | Metrics

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The Current Management and Control Tendency of Domestic and Overseas PAHs in Automotive Materials LIU Xiaodong 2022, 47(3): 196-202.  DOI: 10.16638/j.cnki.1671-7988.2022.003.041 Abstract ( )   PDF (1237KB) ( )   With the rapid development of automobile industry, more and more attention has been paid to human health and environmental safety. Polycyclic aromatic hydrocarbons (PAHs) are a class of carcinogens. PAHs in automotive materials have long been controlled in some developed countries and regions. As the control standard of prohibited substances in China's automobile industry, GB 30512 Requirements for Prohibited Substances on Road Vehicles brings PAHs into control. Detection and control requirements of PAHs in automotive materials at domestic and overseas are reviewed. The detection methods including pre-treatment extraction, purification methods and detection equipments are compared and analyzed. The type and limit requirements of controlled PAHs substances at domestic and overseas are also compared and analyzed. The overall summary of PAHs management and control status of automotive materials at domestic and overseas provides reference for PAHs control requirements in the revision of GB 30512 standard. References | Related Articles | Metrics

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Discussion on the Present Situation and Development Measures of New Energy Vehicle Trouble-shooting CAO Haiyan 2022, 47(3): 203-206.  DOI: 10.16638/j.cnki.1671-7988.2022.003.042 Abstract ( )   PDF (1804KB) ( )   In recent years, in order to solve the energy crisis, the state strongly supports the development and application of new energy vehicles. Nowadays, the penetration rate of new energy vehicles is gradually increasing, which brings great challenges to the automobile troubleshooting industry. Therefore, to solve the maintenance problem of new energy vehicles is the basic condition for the development of new energy vehicles. This paper analyzes the common faults of new energy vehicles, excavates the problems existing in the development process of new energy vehicles, especially the shortcomings existing in maintenance, and finally puts forward some suggestions for the development of new energy vehicles maintenance. Hope to the development of new energy vehicle industry has a certain help. References | Related Articles | Metrics

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Review on the Effect of Working Memory on Driving Behavior CHEN Qiyuan 2022, 47(3): 207-209.  DOI: 10.16638/j.cnki.1671-7988.2022.003.043 Abstract ( )   PDF (1796KB) ( )   Starting with the measurement paradigm and research methods of working memory, summarize the influence of working memory on driving behavior. The research status of the relationship between working memory and driving behavior at home and abroad is reviewed. The results show that, compared with drivers with low working memory, drivers with high working memory have better driving stability under certain cognitive tasks. In addition, this article estimates the future development trend of working memory in the field of driving behavior, summarizes the shortcomings of existing research, and provides ideas for the development of driving behavior research from the perspective of working memory quantification and working memory training. References | Related Articles | Metrics