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07 February 2024, Volume 49 Issue 3 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Use and Maintenance
Automobile Education
Standards·Regulations·Management
Reviews


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New Energy Vehicle

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Development and Design of PACK for Automotive New Energy Power Battery System SONG Chunlei 2024, 49(3): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2024.003.001 Abstract ( )   PDF (1665KB) ( )   The power battery system is the source of power for new energy electric vehicles, and as a key component of electric vehicles, its design rationality and safety plays a crucial role in electric vehicles. This article is based on the needs of a certain vehicle company to develop and design a 28 kWh power battery system. The article mainly provides a detailed design and analysis of the power battery system from three aspects: the layout and design of the overall structure of the battery system, the design of the battery electrical system, and the design of the battery thermal management system. The design is reasonable through the analysis and verification of the size chain on the structure, and the feasibility of its performance is verified through simulation analysis of its thermal management system. This design provides a certain theoretical basis for further optimization and experimental verification of the battery system in the future, and also provides a certain reference value for battery system developers. References | Related Articles | Metrics

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Analysis on Research Hot Spots of New Energy Vehicle Technology Based on CiteSpace WANG Shuaishuai 2024, 49(3): 7-14.  DOI: 10.16638/j.cnki.1671-7988.2024.003.002 Abstract ( )   PDF (9613KB) ( )   A total of 1 799 Chinese and English literatures closely related to the research of new energy vehicle technology are selected through the systematic search of China National Knowledge Network Database and WOS core collection database. CiteSpace 6.2.R2 software is used to map the knowledge network of keywords information, and information mining is carried out from the perspectives of dynamic, multiple and time-sharing, etc. to analyze the theme, evolution path, frontier hot spots and development trend of new energy vehicle technology research. The results show that the current research focuses on lithium-ion battery technology, hydrogen fuel cell technology and regenerative braking technology at home and abroad. Improving battery life and energy saving efficiency is the main trend of future research. In addition, the research of fault diagnosis technology, maintenance technology and infrastructure charging pile is also an important future development direction. References | Related Articles | Metrics

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Research on Variable Angle Transmission Ratio of Vehicle Steer-by-wire Based on Fuzzy Control XU Bin 2024, 49(3): 15-23.  DOI: 10.16638/j.cnki.1671-7988.2024.003.003 Abstract ( )   PDF (2146KB) ( )   In order to improve the maneuvering stability of a vehicle with steer-by-wire control, this paper firstly investigates the vehicle response in different speed domains to determine the change characteristics of the vehicle steady state gain. Secondly, the vehicle response of different steering wheel input frequencies is analyzed, and the steering input frequency is taken as the threshold condition for mode switching. Then, the relationship between the steering wheel center position and the "dead zone" is investigated to design the incremental law of the transmission ratio. Finally, a fuzzy controller with variable structure ratio is designed based on multi-factor analysis, and simulation is carried out under typical working conditions. The results show that the turning radius of the vehicle under low speed is obviously smaller than that of the mechanical steering system in the steady state slewing test condition, and the response of the swing angle speed decreases with the increase of the vehicle speed, but it is still higher than that of the mechanical steering system, which is in line with the design requirements of the ideal transmission ratio. Meanwhile, in the intermediate steering test condition, the lateral displacement of the vehicle under this strategy is smaller, which is in line with the expectation that a larger steering input is required in the intermediate steering position. References | Related Articles | Metrics

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Safety Strategy of Electric Vehicle in Assembly Production Process CHEN Fusen 2024, 49(3): 24-29.  DOI: 10.16638/j.cnki.1671-7988.2024.003.004 Abstract ( )   PDF (817KB) ( )   It has become an inevitable trend for new energy electric vehicle to replace fuel vehicle. The structure of new energy electric vehicle is quite different from that of traditional fuel vehicle. The instability and high voltage of battery lead to how to ensure production safety became very important. This paper refers to the safety strategies of several vehicle manufacturer and discusses them from the perspectives of power battery combustion risk, electric shock risk, and electrolyte leakage risk. It summarizes and forms a set of safety production strategies for electric vehicles in vehicle manufacturer and proposes corresponding measures to reduce risks. It provides reference for the safe production to the producer of energy vehicle and battery. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Design and Development of the Intelligent Connected Vehicle Energy Consumption Management System ZHANG Xiaobo 2024, 49(3): 30-35.  DOI: 10.16638/j.cnki.1671-7988.2024.003.005 Abstract ( )   PDF (1312KB) ( )   Under the new situation of intelligent networking and software defined vehicles, Jiangling Motors has carried out a comprehensive iterative upgrade of the company's platform products, and the complexity of the deployment of electronic controllers and software function strategies of the vehicle has increased dramatically. The higher the complexity of the functional strategy, the more likely it is for the vehicle to be unable to start due to power feeding, thus posing a serious challenge to the management of low voltage energy consumption in the vehicle. It is necessary for Jiangling Motors to design a reasonable vehicle low voltage energy management system. Guided by the goal of saving the power consumption of the whole vehicle and ensuring that the vehicle does not appear to be fed, the article systematically designs and describes a set of low-voltage energy consumption management system for the whole vehicle from five dimensions, such as predictive service, vehicle energy management system, vehicle mode management, intelligent power generation system,intelligent power distribution and supplement system, to ensure and help the healthy and rapid development of Jiangling Motors's intelligent networking. References | Related Articles | Metrics

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Path Planning Based on Improved Artificial Potential Field Method in Unstructured Roads CHEN Xiang 2024, 49(3): 36-42.  DOI: 10.16638/j.cnki.1671-7988.2024.003.006 Abstract ( )   PDF (1646KB) ( )   Autonomous driving vehicles often encounter and avoid non structured roads within the park due to their small distance, making it difficult for them to meet smoothly. To address this problem, an improved artificial potential field approach is introduced. Firstly, the road boundary repulsive potential field and the lane centerline potential field are introduced to ensure that the vehicle will not drive out of the road boundary and drive back to the original road. Secondly, in order to solve the problem that it is difficult to realize the meeting of vehicles, temporary target points are set outside the collision range of the vehicle's forward direction and obstacles to avoid the inability to plan the path due to zero force in the situation. In addition, the dynamic repulsive potential field of obstacles is introduced, and according to the current position and velocity of the obstacle, the position of the obstacle can be predicted in the future period, and the obstacle velocity repulsion is combined with the traditional static repulsive field to obtain the final repulsive field. The simulation shows that the improved artificial potential field method introduced has reduced the passing time of meeting and avoiding vehicles on unstructured roads by about 34%. References | Related Articles | Metrics

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Development of ACC Testing System Based on CANoe Software DU Juan 2024, 49(3): 43-47.  DOI: 10.16638/j.cnki.1671-7988.2024.003.007 Abstract ( )   PDF (2858KB) ( )   In order to solve the problem of functional testing and verification of the adaptive cruise control (ACC) testing system for intelligent vehicle models, an ACC testing system is developed based on CANoe software and hardware. This system achieves real-time collection, storage, analysis, and playback of data on the intelligent vehicle controller area network (CAN) bus. The testing method refers to the ACC standard, and the key data of ACC related testing projects can be displayed in real-time for online analysis, offline analysis can also be conducted, and the results of data analysis have important reference value for the evaluation and verification of the functions of the E6 vehicle ACC system, which can facilitate testers to complete the verification of intelligent vehicle ACC functions faster and more efficiently. References | Related Articles | Metrics

Design and Research

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Strength Analysis of Power Battery Box Based on FSEC REN Runguo 2024, 49(3): 48-51.  DOI: 10.16638/j.cnki.1671-7988.2024.003.008 Abstract ( )   PDF (1512KB) ( )   Taking the formula student electric China (FSEC) as a platform, according to the rules and design guidelines proposed by the competition, it is necessary to check the strength of the battery box. Under the condition of meeting the rules of the competition, design a battery box with high strength, high safety and high lightweight. In this paper, through the mathematical model transformation, CATIA software is used to model and assemble the battery box of the prototype car and various components including the battery, and then the static structure of the battery box is analyzed through Ansys Workbench software to obtain the simulation data, and the battery box meeting the safety requirements of the competition is designed. References | Related Articles | Metrics

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Design of Automotive Electronic Brakes Based on Roller Screw Execution Device ZHANG Xuecheng 2024, 49(3): 52-57.  DOI: 10.16638/j.cnki.1671-7988.2024.003.009 Abstract ( )   PDF (1647KB) ( )   A method system for automotive electronic braking using planetary roller screws as actuators are proposed and established in this paper. The core of this method is to achieve greater load- bearing capacity and equivalent reduction ratio by reducing the actual lead of the planetary roller screw, thereby eliminating the reduction mechanism and achieving the goal of simplifying the structure, reducing volume, and reducing weight. This paper expounds the method of realizing the integrated actuator by directly driving the nuts of the planetary roller lead screw by the motor rotor, and analyzes the basic relationship between the movement to ensure smooth braking and the dynamic calculation. The design example of a certain model of automotive electronic brake shows that compared with existing hydraulic brakes, the radial size of the electronic brake caliper is slightly smaller, the lead is less than 0.54, and the achievable reduction ratio is greater than 5, which can replace the existing hydraulic brakes. References | Related Articles | Metrics

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Multi-objective Optimization of Static Characteristics of Electric Vehicle Body Frame ZHANG Zhengqing 2024, 49(3): 58-63.  DOI: 10.16638/j.cnki.1671-7988.2024.003.010 Abstract ( )   PDF (1236KB) ( )   Aiming at the problems of frequent traffic accidents and insufficient research on the body frame of a micro-electric vehicle, this paper adopts the concepts of computer aided engineering (CAE) analysis and multi-objective optimization design to optimize the static characteristics of the body frame of a micro-electric vehicle based on the finite element model of the body frame. Three groups of schemes are compared to make a trade-off between model accuracy and computational efficiency, and the optimal optimization scheme is obtained. Between the comparison of final optimization results and computational efficiency, the scheme using moving least square method in scheme 3 is the best in terms of accuracy and efficiency. After optimization, the torsional rigidity of the body increases by 410.75 N?m/° and the bending rigidity increases by 1 041.2 N/mm, and the static performance of the body skeleton is significantly improved without significant changes in the body mass. References | Related Articles | Metrics

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Multi-objective Optimization for Suspension Hard Points Based on NCGA LI Qiuyue 2024, 49(3): 64-68.  DOI: 10.16638/j.cnki.1671-7988.2024.003.011 Abstract ( )   PDF (1142KB) ( )   In order to effectively and quickly select parameters of suspension hard points coordinate for improving vehicle handling stability, in this paper, response surface method and neighborhood cultivation genetic algorithm (NCGA) are adopted to optimize and design for a certain suspension system. Firstly, the dynamics simulation model of a certain mini-van Macpherson suspension system is established, and the sensitivity of suspension hard points coordinates is analyzed to find out the greater sensitivity of coordinate parameters; Then an approximate mathematical model based on response surface method, which expressed the relationship between the wheel alignment parameters and the selected coordinate parameters is established, and the corresponding precision verification is carried out, and the wheel alignment parameters are reasonably grouped and a unified objective function is established by direct weighing method; At last, the established objective function is optimized and designed combined with NCGA algorithm. The results show that after optimization the variation of each alignment parameters is discordantly finished and the vehicle handling stability when driving is further improved, verifying that the method has proper effectiveness. References | Related Articles | Metrics

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Research on Optimization of Drivability Parameters Based on Hybrid Vehicles ZHU Lin 2024, 49(3): 69-74.  DOI: 10.16638/j.cnki.1671-7988.2024.003.012 Abstract ( )   PDF (1279KB) ( )   With the development of automobile electrification, more and more hybrid vehicles continue to appear. Hybrid vehicles have the characteristics of saving fuel consumption, but the working mode of the motor and the engine can be changed during the vehicle is running, for example the engine can be started or shut off, there may be significant stumbles and jerks during the engine start and stop process which will bring the driver and passengers driving comfort problems. In order to solve the problem of drivability, this paper establishes the vehicle's drivability parametric model. Through sensitivity analysis of the relevant component characteristic parameters that affect the drivability of the vehicle, and comprehensive optimization of the above component characteristic parameters, a solution is found to optimize the drivability of the vehicle, to make the drivability of the hybrid vehicle more in line with the comfort requirements of the driver and passengers. References | Related Articles | Metrics

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Research on the Influence of Interference Pressing of New Energy Vehicle Gear Shaft on the Precision of Intermediate Shaft Gear ZHENG Haitao 2024, 49(3): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2024.003.013 Abstract ( )   PDF (1270KB) ( )   The interference press fitting process is widely used in the field of new energy vehicle gear shaft processing. Due to its involvement in interference press fitting, it may have a certain impact on gear accuracy, leading to a decrease in the noise, vibration, harshness (NVH) level of the electric drive assembly. In order to conduct in-depth research on the impact of driven gear press fit interference on the accuracy of the intermediate shaft gear, press fit tests are conducted based on two different interference amounts of 0.03 mm and 0.1 mm. The results show that both types of press fit interference caused the greatest cumulative impact on the gear, about 5 μm and 8 μm, respectively. In addition, the tooth angle of the intermediate shaft gear is sensitive to the press-fitting force, and the maximum change is about 6.5 μm. Therefore, based on the comparative analysis of the above test results: The gear accumulation and tooth orientation angle increase with the increase of press fit interference, which seriously affects the gear accuracy; Other gear accuracy parameters are not sensitive to the amount of interference pressing, and their changes are basically the same. References | Related Articles | Metrics

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Research on Lock Control Strategy of AMT Manual Gear ZHANG Shuangquan 2024, 49(3): 80-85.  DOI: 10.16638/j.cnki.1671-7988.2024.003.014 Abstract ( )   PDF (3793KB) ( )   In order to realize the automated mechanical transmission (AMT) of battery electric commercial vehicles to adapt to complex driving conditions, the transmission can be controlled by the vehicle control unit (VCU) for manual shift and lock control. The motor torque is limited by using the proportion integration (PI) adjustment control method, so that the speed of the drive motor is controlled within the limit. Then perform online calibration based on the controller area network calibration protocol (CCP), intercepts the corresponding message data for analysis, and verifies its function. The test results show that the control method of this paper can realize the manual gear lock function of the vehicle, and at the same time, the body has no jitter phenomenon and has good driving smoothness. References | Related Articles | Metrics

Testing and Experiment

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Test and Evaluation of Regeneration Performance of Gasoline Particulate Filter LI Zheng 2024, 49(3): 86-90.  DOI: 10.16638/j.cnki.1671-7988.2024.003.015 Abstract ( )   PDF (1300KB) ( )   The particulate filter, which collects emissions by filtering vehicle exhaust, is an effective technological measure for automobile oems to cope with increasingly stringent emission standards. Although this technology can effectively reduce pollutant emissions, its regeneration process is prone to side effects such as increased fuel consumption. Through the testing and project control of the regeneration process of gasoline particulate filter (GPF), the paper forms the test specification and evaluation index of the regeneration performance of GPF, which improves the maturity of vehicle project management and user satisfaction. It also accumulates valuable experience for the future to cope with the emission requirements of the new national standard. References | Related Articles | Metrics

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Analysis on the Reasons for Fracture of Leaf Springs in a Light Passenger Car LI Shengchao 2024, 49(3): 91-94.  DOI: 10.16638/j.cnki.1671-7988.2024.003.016 Abstract ( )   PDF (1858KB) ( )   The leaf spring of a light passenger car frequently breaks problems during the durability test of the vehicle. Through macro and micro analysis of the fracture surface, chemical composition analysis, hardness test, metallographic structure detection and analysis, as well as analysis of the position of the milling step and the stress characteristics of the leaf spring, this paper determines the root cause of the fracture of the leaf spring and formulates improvement measures, and is verified through the bench test and vehicle durability test. The results show that the milling range on both sides of the leaf spring lug is too long, resulting in milling steps at the R corner of the leaf spring, which further increases the stress concentration here and causes the leaf spring to break. The issue is solved by reducing the milling length on both sides of the leaf spring lugs. References | Related Articles | Metrics

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Analysis of the Influence of Pre-braking Collision Condition on Occupant Safety LI Chun 2024, 49(3): 95-99.  DOI: 10.16638/j.cnki.1671-7988.2024.003.017 Abstract ( )   PDF (2141KB) ( )   With the development of automobile active safety technology, more and more automobiles are equipped with automatic emergency braking system. At present, the system cannot completely avoid the occurrence of automobile accidents, and before the collision, the automobile has the process of decelerating braking. In view of the above pre-braking, the laboratory accelerated vehicle system is used to carry out the tests of pre-braking condition and pre-braking crash condition, and based on the test data, the motion of the posture of the dummy in the two conditions and the influence of the pre-braking dynamic waveform on the damage performance of the dummy are studied and analyzed. References | Related Articles | Metrics

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The Influence of Coasting Feedback Intensity on Vehicle Energy Consumption XU Fushui 2024, 49(3): 100-104.  DOI: 10.16638/j.cnki.1671-7988.2024.003.018 Abstract ( )   PDF (1199KB) ( )   Energy feedback can effectively improve the cruising range of new energy vehicles. This article takes the coasting feedback energy recovery system of a battery electric vehicle as the research object, and measures the cruising range of the vehicle under different feedback intensity under world light vehicle test cycle (WLTC) condition, and analyzes the influence of coasting feedback intensity on the energy consumption of the vehicle. The experimental results show that with the increase of the coasting feedback intensity, the energy consumption of the vehicle is gradually reduced first. When the coasting feedback intensity increases to a certain extent, the energy consumption no longer decreases, instead of it will be increases with the increase of the coasting feedback intensity. References | Related Articles | Metrics

Process·Materials

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Solution for Electrophoresis Flow Defect of Split Rear Tail Door Outer Panel Based on Welding Process CHU Xiangwei 2024, 49(3): 105-108.  DOI: 10.16638/j.cnki.1671-7988.2024.003.019 Abstract ( )   PDF (2223KB) ( )   Second electrophoresis flow defect in body in white (BIW) is a long-standing problem in automobile painting plants. Engineers from major automobile manufacturers have tried various solutions and achieved some success. This article explores the reduction of electrophoretic flow marks based on welding technology. It analyzes the causes of electrophoretic flow marks from a numerical model structure perspective and proposes a solution of using body adhesive to seal the electrophoretic flow marks. Finally, the electrophoretic flow marks status of mass-produced cars is tracked for one year, and the conclusion is drawn that by optimizing the paint process and increasing the use of body adhesive, the problem of secondary flow marks in electrophoretic coating can be significantly reduced. References | Related Articles | Metrics

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Influence of Gear Macro-parameters on Meshing Stress of Helical Gear Torsen Differential HAO Guanghua 2024, 49(3): 109-112.  DOI: 10.16638/j.cnki.1671-7988.2024.003.020 Abstract ( )   PDF (1428KB) ( )   In order to reduce the fatigue risk of helical Torsen differential gear train, the influence of helical angle and pressure angle on gear meshing stress are investigated by finite element method. The simplified three-dimensional models of differential gear train with different helical angle and pressure angle are established, the mapped mesh method and frictionless contact behavior are adopted, and the static stress distribution of the gear train at different meshing positions are calculated. According to statistics, when the pressure angle remains unchanged and the helical angle increases, the maximum meshing stress of the gear train decreases from 564 MPa to 350 MPa. When the helical angle remains unchanged and the pressure angle increases, the maximum meshing stress of the wheel train decreases from 573 MPa to 478 MPa, so increasing the helical angle and pressure angle can reduce the meshing stress of the helical gear train of Torsen differential. References | Related Articles | Metrics

Use and Maintenance

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Failure Analysis and Improvement of the Door Inner Handle Assembly QI Zhanfeng 2024, 49(3): 113-116.  DOI: 10.16638/j.cnki.1671-7988.2024.003.021 Abstract ( )   PDF (2482KB) ( )   The purpose of the article is to optimize the strength of weak positions to improve product reliability by studying the failure behavior of the door inner handle assembly in the process of use, so as to reduce the failure rate of the aftermarket and avoid user complaints. The article analyzes the failure of the door inner handle assembly of a heavy duty vehicle door system, and with the help of six sigma quality tools, the failure is confirmed and analyzed to find out the key influencing factors affecting the failure of the door inner handle assembly. By increasing the reinforcement to improve the strength of the inner handles, the computer aided engineering (CAE) comparative analysis, before and after the improvement of the product suffered the maximum stress, the inner handles assembly own strength increased by 36%, which can effectively solve the cracking, fracture and other problems caused by the lack of strength. Meanwhile, the tracking verification of the improved product shows that the after sales failure rate is reduced by more than 25%, which is a good effect of the improvement. This study can also provide reference for the failure analysis of other related parts. References | Related Articles | Metrics

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Fault Analysis of Low Voltage Power on Failure of BYD Qin EV WU Mingda 2024, 49(3): 117-120.  DOI: 10.16638/j.cnki.1671-7988.2024.003.022 Abstract ( )   PDF (893KB) ( )   With the support of the country for the new energy vehicle industry, the number of new energy vehicles is constantly increasing, and the failure rate of vehicles is also increasing. This article takes the BYD Qin EV model, which has a high market share, as an example to mainly introduce the working principle and common faults of low-voltage power on. In the diagnostic process, a rigorous diagnostic approach is extremely important for maintenance personnel. This article provides a detailed explanation from four aspects: describing the fault phenomenon, analyzing the possible causes of the fault, diagnosing steps, and analyzing the fault mechanism. Through analysis, a diagnostic approach is established to provide certain reference information for vocational college teachers and maintenance practitioners in the maintenance teaching process. References | Related Articles | Metrics

Automobile Education

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Improving the Quality of Graduation Project in Vehicle Engineering under the Background of New Engineering CHEN Biao 2024, 49(3): 121-124.  DOI: 10.16638/j.cnki.1671-7988.2024.003.023 Abstract ( )   PDF (1027KB) ( )   Based on the dual background of the rapid development of new energy vehicles and the construction of new engineering education, this paper comprehensively analyzes the shortcomings and reasons in undergraduate graduation project from the perspectives of students, supervisors, disciplines, and management. Suggestions are proposed from four aspects: the implementation of graduation project, the reform of practice teaching, the dual supervisors, and the strengthening of process control. These measures can continuously improve the quality of graduation project of vehicle engineering major and provide a reference for the cultivation of outstanding engineers in the context of new engineering education. References | Related Articles | Metrics

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The Ideological and Political Construction and Exploration of the Automobile Theory Course under the OBE Concept YANG Qi 2024, 49(3): 125-128.  DOI: 10.16638/j.cnki.1671-7988.2024.003.024 Abstract ( )   PDF (1095KB) ( )   In the context of the new engineering discipline, the integration of outcomes based education (OBE) concept and ideological and political education into professional course teaching has put forward new requirements and challenges for professional course teachers. This article takes the basic course Automotive Theory in the vehicle engineering major of Shanxi Energy University as the research object, and explores the ideological and political elements of the course and teaching reform based on the OBE concept. Design reverse teaching with student-centered and output oriented approaches. The paper will carry out teaching reform and ideological and political construction from four aspects: course objectives, teaching content, teaching methods, and teaching evaluation, so that the ideological and political education of the course and OBE concepts can work together throughout the entire process of teaching Automotive Theory, comprehensively improving the teaching quality of Automotive Theory based on the principle of output orientation. References | Related Articles | Metrics

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Practice Research on the Integration of "Post-Class Competition Certificate" for Auto Repair Major in Higher Vocational Colleges －Taking Jiangsu Vocational College of Electronics and Information as an Example LI Ping 2024, 49(3): 129-132.  DOI: 10.16638/j.cnki.1671-7988.2024.003.025 Abstract ( )   PDF (1180KB) ( )   It is the goal of training the talents of auto repair specialty in vocational education to train the talents with high-tech and skilled personnel.Combining the "20 items of vocational education" and the reform of "three education", this paper analyzes the current situation and existing problems of the integration of "post course competition certificate" for auto repair professionals in a vocational college. By putting forward the teaching strategy of "five dimensions, three stages and ten links" and the teaching design method of 4C, it carries out practical exploration of the integration of "post course" "course competition" and "course certificate" for auto repair majors. It has practical guiding significance for the professional construction and curriculum reform of auto repair related majors in vocational colleges. References | Related Articles | Metrics

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Curriculum Achievement Evaluation in Automotive Manufacturing Technology under Background of Engineering Certification LIU Huaming 2024, 49(3): 133-136.  DOI: 10.16638/j.cnki.1671-7988.2024.003.026 Abstract ( )   PDF (1241KB) ( )   Curriculum achievement evaluation is one of the important contents of engineering education certification. Taking automotive manufacturing technology as an example, this paper expounds the assessment process and evaluation method of the core course of vehicle engineering. According to the 12 graduation requirements of the engineering education certification standard, the course objectives are formulated, the course assessment methods and the achievement degree calculation methods are introduced, and the achievement degree of each course objectives is calculated by quantitative analysis. The achievement of the course is analyzed, and suggestions for continuous improvement are put forward. The research results of this paper can provide a certain reference for the evaluation of engineering courses. References | Related Articles | Metrics

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Exploration and Practice of Curriculum Ideological and Political Education of Intelligent Automobile Design Based on OBE XIE Jipeng 2024, 49(3): 137-142.  DOI: 10.16638/j.cnki.1671-7988.2024.003.027 Abstract ( )   PDF (1127KB) ( )   This paper mainly explores the outcome based education (OBE) intelligent automobile design curriculum ideological and political teaching mode. Through systematic elaboration, a new type of curriculum ideological and political mode is proposed, and in-depth discussion and practice are carried out in terms of curriculum overall construction ideas, teaching design, and implementation. The specific content includes theoretical foundation, curriculum learning outcome goal setting, and teaching design and implementation. Among them, clarifying curriculum characteristics and educational goals, collecting and constructing ideological and political elements and case libraries of Chinese automobile spirit, and reverse design of outcome goal curriculum teaching are key elements of this model. Practical verification shows that this model can effectively stimulate students' interest, promote their autonomous learning and comprehensive quality improvement. References | Related Articles | Metrics

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Research on the Curriculum Model of Wide Area Flexible Order System for Adult Higher Education FU Qiang 2024, 49(3): 143-147.  DOI: 10.16638/j.cnki.1671-7988.2024.003.028 Abstract ( )   PDF (1160KB) ( )   In response to the problems existing in the curriculum model of adult higher education, a wide area flexible order based curriculum innovation model has been designed. Develop a more flexible and diverse order based curriculum module that integrates multiple majors based on the needs of enterprises, school resources, teacher teaching, and personal interests. Analyze the types of integrated combination models for the four engineering major courses and the feasibility of implementing a one person, one policy curriculum plan. Selecting course module samples from three major directions, A-B, A-C, and A-D, through teaching practice with students majoring in Vehicle Engineering at the School of Continuing Education, the participation of enterprise talent cultivation and students' initiative in learning are improved. The average professional course scores of students in the innovative course module group increased by 9.69%～12.23%, and the integration of multiple majors met the course knowledge needs of enterprise positions. Verified the effectiveness of the wide area flexible order system course model teaching in improving students' professional grades and enhancing the satisfaction of enterprises with talents. References | Related Articles | Metrics

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Ideological and Political Teaching Design of Used Car Appraisal and Evaluation Course under the Concept of "Three-round Education" MA Haizhen 2024, 49(3): 148-152.  DOI: 10.16638/j.cnki.1671-7988.2024.003.029 Abstract ( )   PDF (1101KB) ( )   The course of used car appraisal and evaluation is the core professional course of automobile major in colleges and universities, and it is also one of the textual research courses for used car appraisers. This paper expounds the necessity and feasibility of developing the course of used car appraisal and evaluation under the concept of "Three-round education", and analyzes the teaching situation of the course of used car appraisal and evaluation. Combining with the characteristics of employment of automobile major, this paper introduces the ideological and political design ideas of the course from three aspects: teaching content, teaching method and teacher training. It puts forward the main line of ideological and political teaching of the first lesson, each teaching task, extracurricular practice, the whole process education focus of before class, during class, after class and the course assessment dimension of paying attention to process assessment, in order to achieve the goal of curriculum education. References | Related Articles | Metrics

Standards·Regulations·Management

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Satisfaction Survey and Travel Characteristics Analysis of Cruise Taxis LI Zhiwei 2024, 49(3): 153-158.  DOI: 10.16638/j.cnki.1671-7988.2024.003.030 Abstract ( )   PDF (1326KB) ( )   As an important part of the urban comprehensive transportation system, taxis provide convenient transportation services for citizens. At this stage, compared with the rapid development of online taxis, some problems in the pricing and service of cruise taxis have gradually emerged. This paper compares and analyzes the results of a questionnaire survey on the satisfaction of Xi'an citizens with cruise taxis and online taxis, and uses R language software to analyze the travel characteristics of the weekday order data of cruise taxis in Xi'an, and obtains the temporal and spatial characteristics of cruise taxis in Xi'an. In view of the problems that need to be improved, the optimization strategy of the upgrade of the cruise taxi operation service is made, so as to improve the competitiveness of the cruise taxi in the taxi market. References | Related Articles | Metrics

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Research on New Energy Vehicle Product Planning Method Based on Customer Needs and Investment Optimization ZHANG Ruihong 2024, 49(3): 159-162.  DOI: 10.16638/j.cnki.1671-7988.2024.003.031 Abstract ( )   PDF (1332KB) ( )   The continuous upgrading of market competition forces enterprises to use customer needs as an important reference for product planning. Based on customer needs and investment optimization, it not only brings more product innovation space for enterprises, but also rich profit margins. This article first establishes a customer demand analysis method based on product positioning, target audience analysis, user profiling and scenario analysis. Secondly, the impact of customer demand on product investment planning is analyzed. And a matrix model is proposed between the profit space of product investment planning and customer demand. Finally, the effectiveness of this method is demonstrated through its application on a new energy vehicle. References | Related Articles | Metrics

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Application of Big Data Technology Based on User Reviews in Automobile Development TANG Xiaojian 2024, 49(3): 163-169.  DOI: 10.16638/j.cnki.1671-7988.2024.003.032 Abstract ( )   PDF (1693KB) ( )   With the development of the Chinese automobile industry and market, the automobile market has entered a stage of intense competition. It has become increasingly important to understand consumers' needs more accurately. In this study, a large amount of user review data on car purchases is collected using the internet, and big data technology is employed to analyze the data. Firstly, a significant amount of internet data is cleaned and classified. Then, through natural language processing techniques, sentiment analysis is conducted on all the review data for each car model, and a satisfaction index is constructed. Finally, through the analysis and visualization of the satisfaction index, the weights and thresholds of consumer satisfaction with different attributes of automotive products are determined. In addition to discovering general market patterns through numerical satisfaction index, this study further employ opinion extraction techniques to extract common positive or negative opinions of consumers towards specific attributes of automotive products from a large volume of review data. By utilizing satisfaction index and opinion extraction, this study, employs big data technology, obtains general patterns of consumer satisfaction with popular car models, provides clearer and more accurate guidance for the development of automotive products. References | Related Articles | Metrics

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Study on the Satisfaction of Public Transportation Service Quality in a College YANG Lejun 2024, 49(3): 170-175.  DOI: 10.16638/j.cnki.1671-7988.2024.003.033 Abstract ( )   PDF (1394KB) ( )   In order to improve the quality of urban public transportation service around colleges, this paper conducted a quality satisfaction survey on students of a college of Chuzhou city, and 341 valid questionnaires are returned. A structural equation model considering the overall satisfaction of public transportation service quality, expected value of service quality, perceived value of service quality and passenger loyalty is established to measure passengers' actual feelings about public transportation service quality with five dimensions of safety, reliability, convenience, comfort and economy.The results show that the overall satisfaction of public transportation service quality has a significant positive impact on passenger loyalty, and comfort has the greatest impact on the perception of service quality. Based on the results, it is suggested that operators should focus on improving the driving stationary, the stability of public transportation waiting time and public transportation headway in operational management. References | Related Articles | Metrics

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Analysis and Application of Vehicle Lightweight Evaluation Method GONG Weixin 2024, 49(3): 176-181.  DOI: 10.16638/j.cnki.1671-7988.2024.003.034 Abstract ( )   PDF (1510KB) ( )   To find out the most applicative vehicle lightweight evaluation method and to be used in vehicle weight target setting. This paper analyzes the applicability for different cars of four lightweight methods, including vehicle weight-projection area method, vehicle surface density method, vehicle nominal surface area method and vehicle nominal density method through the partial statistics of vehicle data on the market. The summary is that, vehicle surface density method is more applicative for sedan and weight-projection area method is more applicative for sport utility vehicle (SUV). Then the summary is used to check the rationality of vehicle weight target setting. References | Related Articles | Metrics

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Research on Tire Evaluation Method Based on Fuzzy Relative Superiority Degree JIA Yonghui 2024, 49(3): 182-187.  DOI: 10.16638/j.cnki.1671-7988.2024.003.035 Abstract ( )   PDF (1329KB) ( )   Tires determine the load, energy consumption, safety and other performance indicators of the vehicle, and how to comprehensively and objectively evaluate the comprehensive performance of tires is still one of the main problems faced by the industry. In order to solve this problem, this paper firstly proposes to determine the optimal weight vector of the index based on the fuzzy analytic hierarchy process, and then proposes the fuzzy relative superiority degree decision-making method, and analyzes the calculation results of the collected data of 10 tires and 9 indicators, and obtains the effectiveness of the proposed method evaluation, which provides a reference for the performance evaluation and comprehensive performance improvement of tires. References | Related Articles | Metrics

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Analysis on the Collaborative Management Model of Regional Freight Transport Capacity Resources LI Yongkang 2024, 49(3): 188-192.  DOI: 10.16638/j.cnki.1671-7988.2024.003.036 Abstract ( )   PDF (1441KB) ( )   To solve the issues of excessive transportation resource allocation, high transportation costs and excessive waste of transportation resources in the current highway freight transportation market, this paper integrates transport resources of different regions of enterprises with the help of logistics information platform, and optimizes the transport resources of enterprises. The optimization of capacity scheduling includes two aspects of pickup scheduling and trunk line transportation, and the capacity scheduling model is established to solve the problem by considering the important influencing factors such as transportation cost and vehicle full load rate. The results show that under the cooperative management mode, the load rate of vehicles is greatly increased, the transportation cost is reduced, and the transportation capacity resources are rationally utilized. References | Related Articles | Metrics

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Research Progress in the Sound Design of Automotive Steering Announcements JIANG Quan 2024, 49(3): 193-198.  DOI: 10.16638/j.cnki.1671-7988.2024.003.037 Abstract ( )   PDF (1450KB) ( )   In recent years, the application of sound design in the field of automobiles has become more and more extensive. Enterprises will apply sound design to the automotive sound effect, create their own brand characteristics, and develop the overall sound effect and new technology of automobiles. Firstly, through the research of turning beeping from mechanical sound to synthetic analog sound, this paper mainly analyzes the problems existing in the design of turning beeping at home and abroad, as well as the aspects of sound device, software analog sound design, subjective evaluation and so on; And then mainly discusses the current status and development trend of the sound design of the steering tone from these dimensions; At last, proposes that the current steering tone design needs to develop towards a more personalized and dynamic direction from the aspects of volume, time and frequency. References | Related Articles | Metrics