Archive

24 April 2024, Volume 49 Issue 8 Previous Issue   
---
New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management
Reviews


For Selected:

Download Citations EndNote Ris BibTeX

Toggle Thumbnails

New Energy Vehicle

Select

State of Charge Estimation of Lithium-ion Power Battery Based on RLS and EKF Algorithms PAN Zhengjun 2024, 49(8): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2024.008.001 Abstract ( )   PDF (669KB) ( )   The state of charge (SOC) of the battery is one of the key parameters of the battery management system of electric vehicles, which affects the performance and safety of the vehicle. In this paper, the first-order Thevenin equivalent circuit is used as the battery model, the parameters of the battery are identified by recursive least square method (RLS), and the SOC of the battery is estimated by extended Kalman filter (EKF) algorithm. Comparing the estimated results with the test results, the results show that the combined RLS-EKF algorithm can effectively estimate the SOC value of the battery, and the estimated error value is basically kept within 2%. References | Related Articles | Metrics

Select

Analysis on Modular Simulation of Power Battery Liquid Cooling System WANG Xinxin 2024, 49(8): 6-10.  DOI: 10.16638/j.cnki.1671-7988.2024.008.002 Abstract ( )   PDF (1008KB) ( )   Under normal circumstances, the performance of the power battery system is greatly affected by temperature, so that the power battery works in a reasonable temperature range requires the participation of the thermal management system, which is also an effective way to improve the temperature consistency of the power battery. Among them, the heat dissipation effect of the liquid cooling system is related to the distribution trend of the flow channel, so it is important to implement the flow channel design of the liquid cooling system. In this paper, the difference of battery charging time under different temperature rise rates is compared, and six flow channel structures are proposed, and the flow field and thermal field simulation analysis of six structures is carried out by Star CCM+ software based on low temperature heating conditions. The results show the necessity of adopting liquid cooling system for new energy vehicles. Through the optimization of the flow channel design, the flow resistance of the system is effectively reduced and the temperature uniformity of the system is improved. At the same time, it is proved that only through the heat dissipation analysis and research of modular liquid cooling system and combined with the application requirements in actual engineering, it is expected to obtain the best performance and reasonable and feasible liquid cooling system scheme. References | Related Articles | Metrics

Select

Simulation Research on the Pre-charging System of the Drive System Based on Simscape ZHU Yan 2024, 49(8): 11-16.  DOI: 10.16638/j.cnki.1671-7988.2024.008.003 Abstract ( )   PDF (1480KB) ( )   In order to make the pre-charging system have high stability, this paper takes Changchun University FCC team college students' electric formula car as the research object, uses Simscape model library in MATLAB/Simulink to build the pre-charging control strategy model, pre-charging circuit, pre-charging heat-resistance model, and the discharge circuit model, and analyzes the influence of the pre-charging of the drive system when the direct current/direct current (DC/DC) is powered up. The results show that the capacitor terminal voltage is basically unchanged after the pre-charging time is more than 0.5 s. When the DC/DC circuit is powered up, the pre-charging monitoring time is 0.7 s, and the stability of power-up success is high. Finally, the real-vehicle verification is carried out, and the real-vehicle test results are consistent with the simulation results, and the pre-charging system has a certain degree of rationality and accuracy. References | Related Articles | Metrics

Select

Application of Bidirectional DC/DC Converter in Hybrid Vehicle WU Jun 2024, 49(8): 17-21.  DOI: 10.16638/j.cnki.1671-7988.2024.008.004 Abstract ( )   PDF (1419KB) ( )   With the increasing demand for power performance and fuel consumption of hybrid vehicle, bidirectional direct current to direct current (DC/DC) converters become one of the possible directions to meet user requirements. Based on the application of the bidirectional DC/DC converter in the hybrid vehicle, the paper analyzes the Honda power control unit (PCU) system, the different topological structures and the benefit of using the dual-way staggered topology. Analyze the problems that the bidirectional DC/DC converter may encounter in the hybrid system. And provides suggestions for the selection of bidirectional DC/DC converter for hybrid vehicle. References | Related Articles | Metrics

Intelligent Connected Vehicle

Select

Research on AEB Algorithm Optimization of an Intelligent Shuttle Bus in Pedestrian Crossing Scene LUO Deyi 2024, 49(8): 22-29.  DOI: 10.16638/j.cnki.1671-7988.2024.008.005 Abstract ( )   PDF (1327KB) ( )   To improve the safety of autonomous emergency braking (AEB) for pedestrian protection in complex situations such as pedestrian crossing in landscape (garden) area. In this paper, a dynamic model of an intelligent shuttle bus under the conditions of road excitation characteristics and vehicle characteristics is established, and an intelligent shuttle bus AEB control algorithm based on fuzzy reasoning is proposed. The control algorithm is simulated by MATLAB/Simulink simulation software, and the algorithm is applied to the real vehicle test and compared with the traditional control algorithm. The results show that at 5.14 s full braking, the shuttle is 0.21 s faster than the traditional value of 5.35 s. When the shuttle bus is stopped, the safety distance from the pedestrian is 1.53 m, the optimal value is 1.91 m, and the error of both is 0.38 m, which is more accurate and safe after optimization, and can effectively avoid collisions, and also shows the feasibility of the algorithm. References | Related Articles | Metrics

Select

Analysis and Improvement of the Instrument Cluster Black Screen Failure Based on a Certain Vehicle Model SHAO Yunyun 2024, 49(8): 30-34.  DOI: 10.16638/j.cnki.1671-7988.2024.008.006 Abstract ( )   PDF (1160KB) ( )   To deeply analyze the root cause of the black screen failure in the Instrument cluster of a certain vehicle model and provide solutions for improving the quality of the instrument cluster. In this paper, the failur of instrument cluster is analyzed, diagnoses the symptoms and causes to quickly locate issues, and improves product quality. Testing and validating the improved software solution in a full vehicle environment, it has achieved the expected results, demonstrating that the improvement plan is effective and feasible. It provides insights and reference for the similar issues in other vehicle platforms, as well as lessons learned for the development of new model instrument clusters to avoid the recurrence of duplicate issues in the future. References | Related Articles | Metrics

Design and Research

Select

The Design of Airbag Type Pedestrian Protection Device for Vehicle OU Guangqi 2024, 49(8): 35-44.  DOI: 10.16638/j.cnki.1671-7988.2024.008.007 Abstract ( )   PDF (2614KB) ( )   Traffic accidents, especially pedestrian-vehicle collisions cause significant human casualties. In order to enhance passive safety in automobiles, a vehicle airbag-based pedestrian protection device has been designed. Collision simulation analyses are conducted on the impacts between pedestrian heads and the vehicle's windshield and external airbags. The results show that the head injury criterion (HIC) without airbags is 2 123, while it reduced to 845 with airbags. Therefore, the vehicle airbag-based pedestrian protection device can effectively reduce head injuries in pedestrians. The hardware circuit of the device is designed using Altium Designer (AD) software, and the circuit simulation is conducted using Proteus and Keil software, and the simulation verified that the safety airbag can be successfully triggered under specific conditions. References | Related Articles | Metrics

Select

The Influence of Two Miller Cycles on Diesel Engine Performance ZHANG Qiang 2024, 49(8): 45-51.  DOI: 10.16638/j.cnki.1671-7988.2024.008.008 Abstract ( )   PDF (1310KB) ( )   A one-dimensional simulation model based on light diesel engine is established by using GT-Power software. The accuracy of the simulation model is verified and analyzed by the test data and simulation data. The effects of two Miller cycles on diesel engine performance are studied. The results show that when the engine runs at rated speed and adopts early intake valve closure (EIVC) strategy, the cylinder pressure and brake specific fuel consumption decrease with the increase of Miller degree, and the NOx emission decreases with the increase of Miller degree. When late intake valve closure (LIVC) strategy is adopted, the cylinder pressure decreases with the increase of Miller cycle, the brake specific fuel consumption increases with the increase of Miller degree, and NOx increases first and then decreases with the increase of Miller degree. When the diesel engine is working at 1 800 r/min, the EIVC strategy is adopted, the cylinder pressure decreases with the increase of the Miller cycle degree, the braking specific fuel consumption increases with the increase of the Miller cycle degree, and the NOx emission increases first and then decreases with the increase of the Miller cycle degree. Using LIVC strategy, the cylinder pressure decreases with the increase of Miller degree, the braking specific fuel consumption increases with the increase of Miller degree, and the NOx emission decreases with the increase of Miller degree. References | Related Articles | Metrics

Select

Structural Analysis and Topology Optimization Design of Industrial Manipulator Based on ANSYS HUANG Lili 2024, 49(8): 52-58.  DOI: 10.16638/j.cnki.1671-7988.2024.008.009 Abstract ( )   PDF (1835KB) ( )   The stiffness and natural frequency of the manipulator have an important influence on its reliability, which needs to be further studied. In this paper, a certain type of six-degree-of-freedom industrial manipulator is modeled and designed. The finite element analysis method is used in ANSYS software. The static structure analysis and modal analysis of the manipulator under the condition of maximum torque are carried out to verify whether its stiffness and natural frequency meet the requirements. The topology optimization method is further used to optimize the big arm, and then the model of the big arm is reconstructed, which is imported into the whole manipulator for structural analysis and modal analysis. The performance difference of the manipulator before and after optimization is compared, and the reliability of the improved manipulator is verified. The lightweight goal is achieved, which provides a reference for subsequent production. References | Related Articles | Metrics

Select

Optimization Strategy of Dummy Chest Pressure Based on Column Collision Condition WANG Xiaoxin 2024, 49(8): 59-63.  DOI: 10.16638/j.cnki.1671-7988.2024.008.010 Abstract ( )   PDF (1331KB) ( )   According to the results released by the Zhongqi evaluation in 2022, the overall chest scoring rate of the pillar touch dummy is low. In order to solve the problem of excessive chest pressure of dummy with column impact, this paper studies the development process of side column impact of a vehicle, and adopts simulation analysis, Narrow-gap test and pulley test to optimize the side airbag (SAB) package type, and verifies the optimization strategy through vehicle test. The study shows that the SAB package type is closely related to the arm lifting posture and chest injury of the dummy. Adjusting the design height of the SAB shoulder region can effectively improve the arm lifting posture of the dummy and reduce the chest injury. The results of this paper can provide a new development idea for the passive safety development of column collision. References | Related Articles | Metrics

Select

Research on Vibration Transmission Characteristics of Seat Based on Lumbar Support MIN Lei 2024, 49(8): 64-68.  DOI: 10.16638/j.cnki.1671-7988.2024.008.011 Abstract ( )   PDF (1708KB) ( )   In order to fully study the influence of waist support on seat vibration transmission characteristics, this paper takes a certain type of seat as the research object. this paper takes the three states of seat waist support:"initial", "middle" and "maximum" waist support as the starting point. A bench experiment is conducted to test the acceleration transmission rate from the bottom of the seat to the cushion and from the bottom to the back of the seat when 6 volunteers are excited by random vibration in the front and rear direction (1～30 Hz). Through systematic analysis, it is found that when the waist support state is strengthened, the resonance peak value of the vibration transmission rate from the bottom of the seat to the backrest decreases, and the resonance peak value of the vibration transmission rate from the bottom of the seat to the cushion increases. This research has certain reference value in the fields of automobile seat design optimization, chassis system design and layout and so on. References | Related Articles | Metrics

Select

Research and Application of Multidisciplinary Optimization Technology for Performance of Body Structure WANG Xiangting 2024, 49(8): 69-73.  DOI: 10.16638/j.cnki.1671-7988.2024.008.012 Abstract ( )   PDF (4033KB) ( )   As the competition in the automobile market is increasingly intensifying, body design is facing severe challenges. In the early design of the body structure platform, it is necessary to consider the body collision, noise, vibration, harshness (NVH) and strength fatigue performance of different models of the platform. With the increasing difficulty of crashworthiness design of body structure, the weight of body increases, and the balance between performance and lightweight design of structure becomes more difficult. In order to cope with the challenges of body development, this paper studies the multi-disciplinary optimization technology of body structure performance, which runs through the simulation optimization drive design in the conceptual design stage of body structure performance integration. It can quickly achieve the performance standard under the premise of minimum weight increase. Based on the model development case of a sport utility vehicle (SUV), the feasibility of this technology is explained, which provides a reference for the later body development. References | Related Articles | Metrics

Select

Analysis on DMTL Diagnosis Principle and Strategy WU Yuxing 2024, 49(8): 74-79.  DOI: 10.16638/j.cnki.1671-7988.2024.008.013 Abstract ( )   PDF (1512KB) ( )   In accordance with the requirements of China's sixth stage of light vehicle emission standards, some manufacturers now add diagnostic module tank leak (DMTL) on the basis of vehicle fuel evaporation system to identify and diagnose whether fuel gas leakage occurs in the fuel tank system, and record the fault code to light the fault light. Due to the motor manufacturing process deviation in the DMTL module, resulting in the generation of motor limit parts, so that the motor current is unstable in the work, can not accurately reflect the pressure change of the tank system, resulting in false alarm of the DMTL module. Through in-depth interpretation and systematic induction of DMTL diagnosis strategy, combined with the feedback and complaints of users in the market, this paper uses different after-sales complaint diagnosis pumps to conduct tests and data collection and analysis, sort out the logical optimization direction of diagnosis strategy, and improve the quality of engine software. References | Related Articles | Metrics

Select

Verification and Optimization Method for Transmission Shaft Layout of Heavy Duty Commercial Vehicle MIAO Fenglei 2024, 49(8): 80-84.  DOI: 10.16638/j.cnki.1671-7988.2024.008.014 Abstract ( )   PDF (1485KB) ( )   Cross shaft universal joint drive is mostly used in heavy commercial vehicle, and the cross shaft arrangement angle is an important factor affecting the service life of the drive shaft assembly. Firstly, by analyzing the failure mode and stress situation of the transmission shaft, it is concluded that the excessive transmission shaft angle is one of the main reasons for its failure. Then, the optimal arrangement angle of dynamics is obtained by using multi-body model and design of experiment (DOE) analysis method. Finally, the transmission shaft arrangement hard point, connection flange offset distance and flange length are optimized. The equivalent angle of the transmission shaft is significantly reduced after optimization, which effectively improves the service life of the transmission shaft and solves the problem of transmission shaft failure. References | Related Articles | Metrics

Select

Lateral Stability Analysis Based on Active Front Wheel Steering WANG Yongqiang 2024, 49(8): 85-88.  DOI: 10.16638/j.cnki.1671-7988.2024.008.015 Abstract ( )   PDF (1158KB) ( )   In order to improve the operating stability and safety of the vehicle, an active front steering (AFS) controller is constructed. Firstly, the vehicle lateral stability controller is designed according to the lateral deflection angle of the center of mass and the lateral stability coefficient, and the intervention time of the active front wheel steering controller is judged. Then, with yaw speed as input parameter, an active front wheel steering controller is designed by using variable structure synovial control theory. The additional front wheel angle is calculated, and the adjusted front wheel angle is combined with the final output of the steering system. Finally, through the co-simulation, the results show that the designed controller can improve the lateral performance of the vehicle well and ensure the lateral stability of the vehicle. References | Related Articles | Metrics

Select

Key Technology Research on Production Quality Control of Domestic Chip-based Schemes Vehicle Control Unit ZHAO Weijie 2024, 49(8): 89-93.  DOI: 10.16638/j.cnki.1671-7988.2024.008.016 Abstract ( )   PDF (2677KB) ( )   The vehicle controller unit (VCU) is a core unit in new energy vehicles, responsible for overall power and energy control, as well as network and security management functions. To effectively ensure the production quality of domestic chip solution-based vehicle controllers, this paper conducts research on functional testing and end-of-line (EOL) testing technologies for production quality control of vehicle controller products. Related testing equipment is developed to achieve production quality control for domestic chip solution vehicle controllers. References | Related Articles | Metrics

Select

Selection Design and Motion Simulation of Air Spring for Bus Cabin Door CAI Yongheng 2024, 49(8): 94-98.  DOI: 10.16638/j.cnki.1671-7988.2024.008.017 Abstract ( )   PDF (1666KB) ( )   This paper aims to advance the quality, efficiency, and visualization in the selection process of air springs for cabin doors of buses. Utilizing three-dimensional modeling software, the optimal positioning for the air springs is ascertained through graphic methods. This is followed by theoretical verifications to ensure the determined positioning provides the required support and closing forces for the cabin doors. The utilization of the digital mock-up (DMU) module within CATIA facilitates the motion simulation of the air spring, affording a visual assessment of the door opening angle and potential interference conflicts. This proactive approach at the initial design stage confirms the efficacy of the air spring's self-locking feature. Employing 3D selection design and motion simulation analysis for air spring systems notably increases the design process's precision and efficiency, preemptively circumventing issues related to incorrect door opening angles, inadequate opening forces, and diminished gas spring longevity. References | Related Articles | Metrics

Testing and Experiment

Select

Simulation Analysis of Shell Strength of ELSD Based on Romax and ABAQUS MA Panpan 2024, 49(8): 99-101.  DOI: 10.16638/j.cnki.1671-7988.2024.008.018 Abstract ( )   PDF (1590KB) ( )   In order to study the shell strength of the electronic limited slip differential (ELSD), the ELSD's shell finite element analysis model is established based on ABAQUS platform, and the correctness of the model is verified by modal analysis results. Two kinds of limit conditions are set up, and Romax and ABAQUS are combined to analyze the stress and strain analysis under different working conditions of the ELSD. The results show that the maximum stress value of condition 2 is larger, and the value is less than the allowable stress of QT450-10, indicating that the shell strength can meet the use requirements. At the same time, damage is easy to occur at the maximum strain under different working conditions, which provides a theoretical basis for further optimization of the shell of the ELSD. References | Related Articles | Metrics

Select

Study on Ammonia Storage Performance of In-situ Coated Monolithic SCR Catalyst LI Kaixiang 2024, 49(8): 102-108.  DOI: 10.16638/j.cnki.1671-7988.2024.008.019 Abstract ( )   PDF (1899KB) ( )   With the increasing tightening of ammonia escape limits in emission regulations, it is crucial to study the ammonia storage performance of selective catalyst reduction (SCR) catalysts. The copper-based SCR zeolite catalysts prepared by in-situ coating are used, and In-situ FTIRs and NH3-TPD are used to characterize the chemical adsorption features, and the engine bench-top performance tests are conducted in accordance with the cycle of China VI. The results show that the NOX conversion is close to 100% in 200～450 ℃, and the NH3 desorption corresponded to weak, medium-strong and strong acid sites, respectively. Among them, the adsorbed species NH4 + forms on the strong acid sites is thermally stable. The effect of space velocity on ammonia storage in the SCR catalytic coating is small, and the ratio of ammonia escape to reaction ammonia consumption before and after spray stopping is positively correlated with the ratio of reaction ammonia consumption. The ratio of ammonia escape to reaction ammonia consumption before and after spraying stopping is 40 000 h-1>60 000 h-1>20 000 h-1 in the order of high to low in the range of 300～400 ℃. The correlation between ammonia storage and ammonia escape, NOX conversion rate, and the influences of space velocity, temperature, and urea injection are explored to provide a reference for the development of SCR catalyst formulation and urea injection control strategy. References | Related Articles | Metrics

Select

Research on the Effects of Different Speeds and Air Temperatures on Tire Temperature XIA Jingjun 2024, 49(8): 109-114.  DOI: 10.16638/j.cnki.1671-7988.2024.008.020 Abstract ( )   PDF (2475KB) ( )   In order to study the temperature change of tire under different speed and temperature conditions, the temperature control of tire drum laboratory is carried out. The temperature data of tire tread and inner cavity under different speeds and air temperatures are measured by sensors, and the temperature rise trend of tire tread and inner cavity with the change of speed and air temperature is obtained. The temperature rise range of the measured tire under different conditions is analyzed, and the temperature stability values of tire tread and inner cavity under different speed and air temperature conditions are compared in detail. Through the study of tire temperature characteristics, it provides experience for the environmental adaptability analysis and verification method of tire products, and can also be used as a data reference for tire performance test and simulation work considering air temperature conditions. References | Related Articles | Metrics

Select

The Impact of Non Road Four Stage Calculation Methods on Emission Results ZHANG Chao 2024, 49(8): 115-118.  DOI: 10.16638/j.cnki.1671-7988.2024.008.021 Abstract ( )   PDF (1234KB) ( )   The emission of pollutants from non road diesel mobile machinery is closely related to atmospheric environmental quality. With the development of society, the number of non road mobile machinery is constantly increasing. Therefore, the importance of emission supervision and testing for such machinery is self-evident. After conducting experiments on non road four stage construction machinery using the portable emission measurement system (PEMS), the article compares the changes in emission levels of the machinery before and after removing invalid events using the power basis window method. It is found that the emission level of the machinery decreased by 11.2% after removing invalid events. The impact of data processing methods on emission results is analyzed, which provides a reference for future emission supervision and testing of non road mobile machinery. References | Related Articles | Metrics

Select

Optimization of Noise in a 9.5 Ton Drive Axle Assembly for a Certain Passenger Car QIN Jiangnan 2024, 49(8): 119-125.  DOI: 10.16638/j.cnki.1671-7988.2024.008.022 Abstract ( )   PDF (2820KB) ( )   A series of vehicle tests are conducted to address the issue of poor noise, vibration, harshness (NVH) performance of the 9.5-ton drive axle assembly of a certain passenger car. The root causes of the problem are ultimately determined, including insufficient isolation rate of the lower thrust rod and design and manufacturing errors in the main reducer gear. In order to reduce the noise of the drive axle assembly, improvements and optimizations have been made, including tooth surface modification of the hypoid gear of the main reducer and design improvements of the lower thrust rod structure. In order to verify the rationality of the two optimization schemes, bench tests are conducted in the laboratory and whole vehicle tests are conducted in actual driving environments. The effects of gear modification of the main reducer and optimization of the lower thrust rod structure on the noise of the drive axle assembly are analyzed. The results show that both optimization schemes reduce the noise of the drive axle assembly by about 10 dB(A), with a significant reduction in the noise values of the 9th order and its harmonics. Therefore, both optimization schemes have played a certain role in vibration reduction and noise reduction, providing a reference for improving the NVH performance of the bus drive axle assembly. References | Related Articles | Metrics

Process·Materials

Select

Problem Exploration of Insufficient Stamping Height of Right Door Panel of New Energy Vehicle WU Haibo 2024, 49(8): 126-129.  DOI: 10.16638/j.cnki.1671-7988.2024.008.023 Abstract ( )   PDF (2322KB) ( )   A new energy automobile enterprise uses high corrosion resistance steel S450AW to press the right door panel parts, and the height of the four corner convex is obviously low, which can not meet the product requirements. In order to solve practical production problems quickly, drawing and shaping analysis models are made according to product digital models. The simulation analysis of the whole process of right door panel stamping is completed by computer aided engineering (CAE) simulation, and the simulation analysis results are compared with the upper and lower die surfaces of the actual stamping die by the reverse scanning of the ATOS I 350 & TRITOP 3D optical mapper. The causes of stamping problems are determined and the mold optimization scheme is developed. The optimization scheme is implemented and stamping verification is carried out to solve the problem of insufficient height of the parts boss, which provides an alternative technical scheme for solving such problems in the future. References | Related Articles | Metrics

Select

Study on the Weldability of Hot-formed Steel Spot Welding and the Influence of Parameters on Mechanical Properties XIE Jipu 2024, 49(8): 130-134.  DOI: 10.16638/j.cnki.1671-7988.2024.008.024 Abstract ( )   PDF (1461KB) ( )   Hot-formed steel is prone to spot welding problems such as weak welding and serious spatter. To study the weldability analysis of hot-formed steel and the influence of parameters on the mechanical properties of joints, a 1.0 mm thick B1500HS steel plate is used for testing. Research has shown that B1500HS steel plate has good weldability. The strength of the solder joint shows a trend of first increasing and then decreasing with the increase of welding current. The maximum shear force of soft specification solder joints is higher than that of hard specification solder joints. The welding time is between 240 and 300 ms, and the welding joint strength is the highest when the welding current is between 9.5 and 10.0 kA. There is a certain proportion of probability of interface fracture when hot-formed steel is subjected to shear force. The strength of interface fracture under shear test environment is below 12.07 kN, and the strength of button fracture is between 12.14 and 17.42 kN. The safety performance of the body structure is higher when the button is broken. References | Related Articles | Metrics

Select

Introduction and Design of Automotive Side Mirror ZHAO Xiaoqun 2024, 49(8): 135-139.  DOI: 10.16638/j.cnki.1671-7988.2024.008.025 Abstract ( )   PDF (1817KB) ( )   This paper introduces the basic characteristics and requirements of automotive side mirror component, material, assembly, performance and experiment. For side mirror design risk and assembly process during automotive development, this paper proposes phased delivery as design method, and defines key delivery content of different phases by considering appearance of side mirror, interface component, safety regulation, vehicle attribute, internal package, assembly process and other factors, to have a general description of side mirror design, providing references about optimized design and avoidance of design risks for mirror design engineers. References | Related Articles | Metrics

Select

A Method of Eliminating for the Processing Vibration Marks of Main Reducer Shell Assembly TIAN Jian 2024, 49(8): 140-143.  DOI: 10.16638/j.cnki.1671-7988.2024.008.026 Abstract ( )   PDF (1632KB) ( )   The main reducer is the key component of reducing speed and increasing torque in the automobile axle transmission system, and the main component of the main reducer is the main reducer shell assembly, and the differential bearing cover of the assembly has the function of installing bearings and positioning, but the phenomenon of vibration of the positioning pin of the differential bearing cover exists for a long time. This paper introduces a solution to eliminate the machining vibration marks of the differential bearing cover positioning pin of the main reducer housing assembly. By improving the tool structure, cutting parameters, tooling, etc, the machining vibration marks are completely eliminated, the scrap rate is effectively reduced, and the product quality is improved. References | Related Articles | Metrics

Select

Discussion on Acceptance Method of Fixture Design Scheme in Welding Workshop JIANG Wei 2024, 49(8): 144-147.  DOI: 10.16638/j.cnki.1671-7988.2024.008.027 Abstract ( )   PDF (1931KB) ( )   This paper mainly explores and discusses the whole process of fixture acceptance in welding workshop, the specific work that needs to be carried out in each link, and the problems that need attention. At the same time, it is also a summary of the acceptance experience of the previous model fixture design scheme. In the actual work development process, skilled use of plan, do, check, act (PDCA) thinking mode, encounter specific fixture design or installation problems from the man-machine material method and other dimensions of the problem analysis. Raise questions to analyze problems, as well as solutions to problems, full-dimensional tracking and verification, and finally form a systematic guidance program. It provides a feasible method research and technical guidance for the follow-up similar work, which is a good practical problem case base and problem solution, and has certain popularization value. References | Related Articles | Metrics

Automobile Education

Select

Practice Research on Two-dimensional Exploration System of Ideological and Political Elements in Automobile Design Course LI Dezhen 2024, 49(8): 148-153.  DOI: 10.16638/j.cnki.1671-7988.2024.008.028 Abstract ( )   PDF (1058KB) ( )   In the process of cultivating high-quality socialist builders, ideological and political courses in professional courses have become a necessary link in the teaching of colleges and universities. As a core course of vehicle engineering in colleges and universities, Automotive Design currently has the common problem of insufficient moral education process in its teaching links. According to the course characteristics and teaching status of Automotive Design, this paper establishes the moral education goal of the course, establishes a two-dimensional excavation system of ideological and political elements, horizontally improves the coverage of the excavation process, deepens the interpretation and sublimation of the excavation results vertically, highly integrates ideological and political elements with teaching practice, and completes the training process of all-round development of automotive engineers through diversified classroom teaching methods. References | Related Articles | Metrics

Select

Research on on-line and off-line Hybrid Teaching of Automotive Engineering Materials Based on First-class Course SHENG Xiaofei 2024, 49(8): 154-158.  DOI: 10.16638/j.cnki.1671-7988.2024.008.029 Abstract ( )   PDF (1110KB) ( )   This paper analyzes the necessity of on-line and off-line mixed teaching of Automotive Engineering Materials. The implementation channels of on-line and off-line hybrid in the course teaching reform is expounded from the aspects of course knowledge system, teaching contents, teaching resources, teaching methods, examination methods and continuous improvement, etc., combining with the course characteristics and the guidance and requirements of the first-class course. Through the mixed teaching of leading before class-learning in class-reviewing after class-reflecting and improving, it promotes the organic combination of online and offline teaching, and promotes the application and sharing of high-quality educational resources, it mobilizes the enthusiasm of students to study greatly. Teaching practice shows that the establishment of student-centered online-offline hybrid teaching model, improve the learning efficiency of students, and has achieved good teaching results. References | Related Articles | Metrics

Select

Research on Course Assessment Plan Reform of Maintenance and Fault Diagnosis of New Energy Vehicles JIANG Xingyang 2024, 49(8): 159-163.  DOI: 10.16638/j.cnki.1671-7988.2024.008.030 Abstract ( )   PDF (1178KB) ( )   This paper deeply analyzes the problems existing in the practical training and assessment courses of new energy vehicle technology majors, the purpose is to construct the evaluation system which is helpful to the training of talents, and to strengthen the reform of higher vocational education teaching. on this basis, takes the course Maintenance and Fault Diagnosis of New Energy Vehicles as an example, proposes to reconstruct the course content and implement project-based teaching. Based on the core professional ability and literacy required for new energy vehicle maintenance positions, establish a full-staff assessment and evaluation system for core courses of new energy vehicle technology majors, and the assessment methods are specific, objective, clear and quantifiable, so as to promote the improvement of teacher teaching quality and student training effects, and provide a new idea for the teaching assessment reform of this course. References | Related Articles | Metrics

Select

Reform and Practice of Ideological and Political Education in the Course of Automobile Chassis Construction LI Jin 2024, 49(8): 164-167.  DOI: 10.16638/j.cnki.1671-7988.2024.008.031 Abstract ( )   PDF (1220KB) ( )   The Automobile Chassis Construction is a required basic course for students majoring in vehicle engineering. It is a course with strong speciality and practicability. According to the characteristics of the course Automobile Chassis Construction, this research constructs the course of ideological and political education with the method of case introduction, intersperses the elements of ideological and political education naturally in the course of teaching, and adds non-traditional safety education into the course to improve students' awareness of ecological security and information security. References | Related Articles | Metrics

Select

Ideological and Political Practice of Automobile Marketing Practice Course Based on the "Trinity" Education Concept CHEN Yong 2024, 49(8): 168-172.  DOI: 10.16638/j.cnki.1671-7988.2024.008.032 Abstract ( )   PDF (1381KB) ( )   Course ideological and political is an effective way to realize the teaching of the knowledge, the cultivating of the ability, and the shaping of the sense of worth "Trinity" education concept, and it also satisfies the requirement to accomplish the moraleducation idea. How to achieve the integration of professional knowledge and course ideological and political education is an important issue faced in teaching implementation. The article presents a concentrated and repetitive content on the ideological and political research of the course Automobile Marketing Practice, limited innovation and high-quality achievements, single research methods, and other issues. Taking the nine major processes of automobile sales in 4S stores as the main thread, and using real enterprise cases as the carrier, integrating ideological and political elements such as socialist core values, labor spirit, and service consciousness, good teaching results are achieved, providing reference for the practice of ideological and political design in other courses. References | Related Articles | Metrics

Select

Research on Promoting Vocational Ducation Teaching Reform Based on Skill Competition of Automobile Vocational Colleges SUN Hongliang 2024, 49(8): 173-176.  DOI: 10.16638/j.cnki.1671-7988.2024.008.033 Abstract ( )   PDF (1150KB) ( )   With the rapid development of social economy and the continuous improvement of production level, the automobile industry is faced with the problem of lack of new professional and technical personnel. Vocational colleges are the main channels for professional and technical personnel training, the article mainly takes automobile majors as an example, aiming at the requirements of new energy automobile technology skills competition on the professional ability of participants, and the requirements of the operation standards of the competition, ect. Vocational education teaching reform should be carried out in the aspects of students' ideology, teachers' professional ability, personnel training mode, practical training conditions, school-enterprise cooperation, teaching quality evaluation, etc. By holding or participating in vocational skills competition, the education and teaching reform of automotive majors is promoted, the training quality of automotive majors in higher vocational colleges is improved, a large number of professional and technical talents are provided for the automotive industry, and the integration of competition and teaching is realized. References | Related Articles | Metrics

Standards·Regulations·Management

Select

Interpretation of European Standard and Uncertainty Analysis of Control Force for Automotive Steering Test LIU Xin 2024, 49(8): 177-181.  DOI: 10.16638/j.cnki.1671-7988.2024.008.034 Abstract ( )   PDF (1277KB) ( )   The automotive steering device is a key device for drivers to achieve their driving intentions. In order to further improve the accuracy of automotive steering device testing work, this article introduces the steering device testing methods for automotives in chapter six of the European Standard Uniform Provisions on the Approval of Vehicles in Terms of Steering Devices (UN Regulation No.79/03), and compares the similarities and differences between the analytical standards of the national standard GB 17675－2021. According to the test method of the European standard, an uncertainty analysis of steering control force is conducted on a certain N2 class truck as an example, and directions for improving the accuracy of the test are proposed through analysis. References | Related Articles | Metrics

Select

"Seven Steps" of Quality Improvement to Solve the Aftersales Issue of Vehicle Sunroof Water Leakage HE Yi 2024, 49(8): 182-186.  DOI: 10.16638/j.cnki.1671-7988.2024.008.035 Abstract ( )   PDF (1877KB) ( )   The sunroof is one of the preferred configurations for customers when choosing a vehicle, but any vehicle manufacturer does not want to encounter the issue of sunroof leakage in the aftersales market. The occurrence of such issues requires high attention and rapid resolution, and measures need to be solidified. This article focuses on a sunroof water leakage issue in the aftersales market, using the "seven steps" of quality improvement to solve the sunroof water leakage. Many practical quality management tools from the "seven steps" are used, such as the plan, do, check, act (PDCA) cycle, fault description 5W1H, fishbone factor analysis, 5Why etc. Through the solution of this case, the complete usage process of the "seven steps" is presented, quickly and effectively solved the after-sales problem of sunroof leakage. References | Related Articles | Metrics

Reviews

Select

China's New Energy Vehicle Development Status and Countermeasures Suggestions WANG Pin 2024, 49(8): 187-191.  DOI: 10.16638/j.cnki.1671-7988.2024.008.036 Abstract ( )   PDF (1212KB) ( )   With the increase in the number of traditional fuel vehicles, the problem of environmental pollution is becoming more and more serious. At this stage, the development of new energy automobile industry has become the consensus of each country. Firstly, the article discusses the classification of new energy vehicles. Secondly, it lists the national policies on new energy vehicles and elaborates the industrial development status of domestic new energy vehicles from the aspects of new energy vehicle sales volume and insurance volume. At the same time, it analyzes the problems in the development of new energy vehicles, pointing out that the price and cost of new energy vehicles are high, the range is insufficient, the safety is insufficient, and the core technology of enterprises is lacking. Finally, the recommendations are made to promote the high-quality and efficient development of the new energy vehicle industry. References | Related Articles | Metrics

Select

Research Status and Optimization Strategy of the Detection Methods of Brake Wear Degree for Automobile LIN Di 2024, 49(8): 192-196.  DOI: 10.16638/j.cnki.1671-7988.2024.008.037 Abstract ( )   PDF (1014KB) ( )   By analysising of the existing detection methods of brake wear degree for automobile, explores and improves the inspection methods of brake wear degree to improve the safety and reliability of brake. On the basis of the traditional inspection methods, the optimization strategy of adding intelligent detection sensors and ultrasonic detection methods is proposed, and the analysis results are displayed by visualization technology. This strategy can improve the accuracy of the detection results to a certain extent, and has the advantages of high efficiency and low cost, and is suitable for the detection of various models and brake types, which greatly improves the detection ability of the degree of brake wear, indirectly reduces the failure rate of automobile, and improves driving safety. References | Related Articles | Metrics