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30 August 2023, Volume 48 Issue 16 Previous Issue   
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Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management


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Intelligent Connected Vehicle

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Research on Active Lane Change Strategy for Vehicles under Emergency Conditions ZHANG Chengrui 2023, 48(16): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2023.016.001 Abstract ( )   PDF (725KB) ( )   Rear-end collision accidents often occur when the vehicle is unable to change lane actively in an emergency or the driver is unable to complete the lane change autonomously. In order to reduce the dependence of the vehicle on the driver and improve the ability of the vehicle to judge the road environment autonomously, this paper proposes a design method of using the superposition function to design the upper controller. According to the actual lane change control logic, the lane change logic model is established. The lane change trajectory planning algorithm is established by the introduced superposition function. The trajectory tracking model is established by preview proportional-integral-derivative (PID). Finally, the CarSim dynamic model is constructed and the corresponding performance parameters are set. The joint simulation results show that the vehicle can better track the path planned by the upper controller, and the lateral acceleration of the vehicle is maintained within the range of ±0.15 m/s2. The active lane change control logic established by this method can make the vehicle maintain good lateral and longitudinal control dynamic stability. References | Related Articles | Metrics

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Global Path Planning in Closed Environment Based on Dijkstra Algorithm ZHENG Hao 2023, 48(16): 7-11.  DOI: 10.16638/j.cnki.1671-7988.2023.016.002 Abstract ( )   PDF (1869KB) ( )   With the rapid development of autonomous driving technology, its key technologies can be divided into four modules: perception, decision, planning and control. Path planning plays an important role in them. A good path planning algorithm can plan an optimal path before automatic driving. In the process of driving, it can combine the environmental information sent back by perception and decision, and then plan a fine-tuned local path in real time. On the basis of completing functions such as obstacle avoidance and lane changing, the planning takes into account the safety and comfort of the driving trajectory. Based on Dijsktra shortest path planning algorithm, this paper starts with the discussion of global path planning and constructs a topological node map in a closed environment. Then improve the algorithm, which not applicable to the pain points in the real environment test of autonomous driving, so as to realize the global path planning task from any starting point to the end point. Finally, it is verified in the real vehicle test. The test results show that in a close and closed-loop environment, the self-driving vehicle can plan the ideal shortest path for driving. References | Related Articles | Metrics

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The Middle Ware of Data Distribution Service and Its Application in Automobile Field SHI Wenzheng 2023, 48(16): 12-18.  DOI: 10.16638/j.cnki.1671-7988.2023.016.003 Abstract ( )   PDF (976KB) ( )   At present, service oriented architecture (SOA) occupies an increasingly important role in vehicle software, and communication middleware is one of the key links in the implementation of SOA. The advantages of data distribution service (DDS) in the automotive field have gradually become prominent. But there is little mention in the literature about the deployment and application of DDS on vehicles. The basic principle, publish-subscribe model and quality strategy of service of DDS is introduced in this paper detailly. Then the whole communication process of DDS and three different forms of DDS deployment on vehicles are introduced. Finally, taking FAST DDS as an example, the specific process of DDS deployment on vehicles is introduced in detail. The communication middleware based on DDS has a wider application prospect in automotive industry. References | Related Articles | Metrics

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Design of AP Data Model Based on PREEvision GAO Yue 2023, 48(16): 19-23.  DOI: 10.16638/j.cnki.1671-7988.2023.016.004 Abstract ( )   PDF (862KB) ( )   In order to solve the problem of consistency and compatibility of data model of adaptive AUTOSAR platform (AP) products, this paper introduces how to design AP data model based on PREEvision, an architecture development tool of Vector company in Germany, including service oriented architecture (SOA) and service interface design, data type design of AP system in C++ language, software module design, process design, Manifest and ARXML file export, etc. AP data model created based on this method can be error-free into a variety of downstream development and testing tools, which has certain guiding significance for the development of automotive AP system software. References | Related Articles | Metrics

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Driverless Formula Car System Dynamics Modeling WANG Zihan 2023, 48(16): 24-28.  DOI: 10.16638/j.cnki.1671-7988.2023.016.005 Abstract ( )   PDF (1060KB) ( )   Taking driverless formula car as the research object, the vehicle dynamics modeling is studied based on MATLAB/Simulink, and the car 3-DoF kinematics mathematical model and dynamics mathematical model are deduced. According to the 3-DoF mathematical model combined with Dugoff tire formula and tire rotation calculation formula, the 7-DoF car dynamics model is derived. The car simulation mathematical model is established in MATLAB/Simulink, and the simulation results of input constant front wheel angle and initial speed are verified, and a test platform is established for the design and test of driverless formula car. References | Related Articles | Metrics

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Risk Recognition of Pedestrian Traffic Accidents Based on CIDAS Data and Interpretable Model HU Jinbang 2023, 48(16): 29-35.  DOI: 10.16638/j.cnki.1671-7988.2023.016.006 Abstract ( )   PDF (1087KB) ( )   Pedestrian road traffic accidents are a common type of traffic accidents. In order to build an effective pedestrian traffic safety prevention and control system, the China in-depth accident study (CIDAS) data is used for analysis and research. After using repeated rounds of K-fold cross- validation to evaluate and confirm that the random forest model has statistical power on this data, the permutation feature importance algorithm is used to quantify the features that affect pedestrian traffic accidents. The data of important features are then statistically analyzed and chi-squared test is used to determine the effect of randomness. The research shows that the number of accident participants, age group, accident occurrence time and maximum speed limit are the most important features affecting the consequences of pedestrian traffic accidents. The overall trend shows that the more people involved in the accident, the more serious the consequences of the accident; for people aged 13 and above, the older the pedestrian, the more serious the consequences of the accident; in the accidents that occurred between 0:00 to 4:00 in the morning, the severity of the accidents is significantly higher than that in other time periods; the consequences of accidents on roads with a speed limit of 80 km/h and above are more serious. References | Related Articles | Metrics

Design and Research

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Design and Application of a Storage Battery Placement and Transfer Device HE Kewei 2023, 48(16): 36-39.  DOI: 10.16638/j.cnki.1671-7988.2023.016.007 Abstract ( )   PDF (1782KB) ( )   With the increasing demand for power supply scenarios, the power supply mode of the existing electrical detection platform cannot adapt to the complex environment of power consumption, and can not conduct electrical inspection on vehicles in a timely manner, resulting in the offline problem of vehicles with electrical appliances, low efficiency of electrical inspection, and large complaints from assemblers, resulting in labor waste. In order to solve this problem, this paper adopts the the concept of movable electric inspection of battery trolley, and a station appliance for battery placement and transfer device is designed to meet the requirements of battery placement and transfer. The device can move freely to meet the electric inspection requirements of different vehicle types and different environments, improve the efficiency of electrical inspection and reduce the labor intensity of electrical inspection. References | Related Articles | Metrics

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Simulation Research on HSG Damping Control Strategy of Vehicle Semi-Active Suspension XIONG Kaiyang 2023, 48(16): 40-45.  DOI: 10.16638/j.cnki.1671-7988.2023.016.008 Abstract ( )   PDF (1577KB) ( )   Semi-active suspension has the advantages of moderate cost and good control effect. The skyhook damping control reduces the sprung mass acceleration while deteriorating the dynamic tire load, while the groundhook damping control does the opposite, reducing the tire dynamic load but increasing the sprung mass acceleration. Combining the respective advantages of the skyhook and groundhook damping control, the hybrid skyhook and groundhook damping control method is used. And the method is simulated and analyzed on a quarter vehicle model. Simulation results show that the hybrid control system can obtain the balance between ride comfort and handling stability by adjusting the weighting coefficient. While obtaining improved ride comfort, it is possible to maintain proper handling performance. It has the characteristics of less calculation, simple and practical operation, etc., and can better realize the control of vehicle vibration. References | Related Articles | Metrics

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A Pure Electric Concrete Mixer Truck and Design Method ZHAO Wei 2023, 48(16): 46-49.  DOI: 10.16638/j.cnki.1671-7988.2023.016.009 Abstract ( )   PDF (1028KB) ( )   In order to reduce the impact of exhaust emissions from urban construction vehicles on the environment and meet the needs of vehicle electrification, this paper introduces a pure electric concrete mixer truck and design method. Firstly, the status quo of diesel fuel concrete mixer truck is introduced. Secondly, the realization route of pure electric is analyzed to determine the technical route to meet the demand. Finally, the technical scheme, configuration and parameters of the development vehicle model are drawn up, and the design method and key points of the pure electric concrete mixer truck are mainly discussed from the aspects of the general layout of the scheme, power battery energy accounting, motor, transmission, frame, suspension and axle matching calculation, etc. The paper has certain theoretical significance and engineering application value. References | Related Articles | Metrics

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Simple Rear-seat Occupant Head Space Checking Method Based on RAMIS LI Huating 2023, 48(16): 50-54.  DOI: 10.16638/j.cnki.1671-7988.2023.016.010 Abstract ( )   PDF (2053KB) ( )   The design of head space check is an important content in the development of the vehicle. Whether the design is reasonable or not has an important impact on the ergonomics and development cycle of the vehicle. This paper mainly uses RAMSIS software to simulate the head movements of different sizes of human bodies, and converts the 3D human head rotation trajectory into 2D simple head envelope to realize the check of the head space of the rear occupant of the vehicle. References | Related Articles | Metrics

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Design of a Structural Model of a Sliding Door for Automobile SUN Zhiliang 2023, 48(16): 55-59.  DOI: 10.16638/j.cnki.1671-7988.2023.016.011 Abstract ( )   PDF (1142KB) ( )   Through the analysis of the structure design of a vehicle chain in this paper, combined with the research of the position system of the door, it focus on the matching accuracy adjustment method of sliding door which is applied to the multi-purpose vehicles (MPV) models and the selection of the adjustment tools. It will be conductive to adjustment of final assembly online about slide doors. It will be better for the visual effect. Meanwhile through the research of the layout of the chain position and space comparison, summarized the the mathematical structure model of selection of the adjustable nut, tool selection of adjustment angle and adjustment range. It will effectively solve the existing design defects, and make a certain guiding role for other models which can avoid the designed defects for the chain of the door. References | Related Articles | Metrics

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Research on Optimization of Static Power Consumption of Commercial Vehicle WANG Manman 2023, 48(16): 60-63.  DOI: 10.16638/j.cnki.1671-7988.2023.016.012 Abstract ( )   PDF (1338KB) ( )   Starting from the causes and effects of static power consumption of commercial vehicles, the static power consumption of the whole vehicle is controlled by controlling the static current of the whole vehicle. How to effectively control the static power consumption of the whole vehicle is studied from the static current test, symmetry analysis, power distribution and other aspects. The methods to control static power consumption in two stages of design and trial production are summarized. In the whole vehicle design stage, according to the use scenario of electrical appliances, the power distribution is designed and the static current index of each component is formulated. Test and verify the components in the trial production stage, and control the static current of the components through the optimization control strategy to control the static power consumption of the whole vehicle. References | Related Articles | Metrics

Testing and Experiment

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Design and Verification of Line Control Dynamic Performance Testing System Based on Double Drum Hub CHEN Zhongting 2023, 48(16): 64-69.  DOI: 10.16638/j.cnki.1671-7988.2023.016.013 Abstract ( )   PDF (1772KB) ( )   The safety performance of vehicles aiming at intelligent driving, especially the braking performance of vehicles, has attracted increasing attention. The paper investigates a more realistic closer to front and rear wheel double drum hub test rig, which can simulate the vehicles in actual operation and achieve accurate testing of the braking performance of smart driving vehicles. Based on this, based on the detection principle of front and rear double-drum hub test bench, the test system of double-drum hub test bench is designed. The test system can automatically evaluate the braking performance of the vehicle, and the test results of vehicle braking performance can be obtained only when the test personnel drive the vehicle to the test bench with the double drum rotating hub according to the system instructions and step on the brake. The paper analyses parameters such as speed step signal, brake pressure step signal and build-up speed duration, and after testing and data analysis, it is learnt that the double drum hub brake test stand is closer to the actual road conditions and the test results can reflect the vehicle braking performance more realistically through the vehicle signal cycle, maximum delay time and brake pressure build-up speed. References | Related Articles | Metrics

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Study on the Influence of Test Methods on Driving Range and Energy Consumption of City Bus LI Lan 2023, 48(16): 70-74.  DOI: 10.16638/j.cnki.1671-7988.2023.016.014 Abstract ( )   PDF (1134KB) ( )   In this paper, the influence of different test methods on driving range and energy consumption of a certain type of city bus is studied by consecutive cycles procedure (CCP) and shortened test procedure (STP). By analyzing the test results, it is found that no matter which test method is used, relatively accurate test results can be obtained, and the difference is less than 5%. In the case of small difference in equivalent energy consumption, if the vehicle's rechargeable energy storage system (REESS) can be discharged more by using a lower constant speed segment, the driving range will be larger, but the energy consumption obtained based on external power supply may also increase. In the STP, because the energy consumption of the second cycle working condition occupies a much higher proportion of equivalent energy consumption than that of the first cycle working condition, it has the greatest impact on the final equivalent energy consumption. Therefore, reasonable optimization of energy consumption at low power (20% ～ 30%) can effectively control the equivalent energy consumption in the test and obtain a more ideal driving range. References | Related Articles | Metrics

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Study on Influencing Factors CO2 and NOx Emissions from Heavy-Duty Diesel Trucks with Biodiesel LIU Pengfei 2023, 48(16): 75-79.  DOI: 10.16638/j.cnki.1671-7988.2023.016.015 Abstract ( )   PDF (1418KB) ( )   This paper investigates transient emission characteristics of CO2 and NOx from diesel vehicles based on chassis dynamometer and China heavy-duty commercial vehicle test cycle for truck (CHTC-HT). The influence of operating modes, cold and hot start, ambient temperature and load on the real-word emission are estimated. Under transient operating conditions, the CO2 emission rate of the test vehicle is significantly positively correlated with the acceleration, and the NOx emission rate in the low-speed acceleration section increases sharply. The ambient temperature and cold and hot start affect the CO2 and NOx emissions of the sampling vehicle. The CO2 emissions are mainly determined by the vehicle speed and load. The average CO2 emission rates at the cold start, urban area, suburb and freeway are 3.84 g/s、2.69 g/s、4.92 g/s and 7.52 g/s, respectively. The NOx emission in the cold start accounts for 62.9% of the emission in the whole test cycle, and the peak value of NOx emission occurs repeatedly in the rapid acceleration process. The impact of load on the specific emission of CO2 is not very significant. Compared with no-load, the average specific emission of NOx at half load is reduced by 27.1%. The average specific emissions of CO2 of test vehicles under urban area, suburb and freeway modes are not significantly different. The average specific emission of urban area NOx is 6 582.7 mg/(kW·h) (No-load) and 5 547.2 mg/(kW·h) (Half-load), which are 1.55 times of suburb, 6.21 times of freeway (No-load), 1.71 times of suburb and 9.94 times of freeway (Half-load), respectively. The results show that it is necessary to focus on the improvement of selective catalytic reduction (SCR) efficiency in a short-term during the cold start period at low temperature; Meanwhile, should pay attention to controlling the NOx emission of biodiesel vehicles under low-speed acceleration, long-term lower load and regular urban driving. References | Related Articles | Metrics

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Coach Frontal Crash Safety Performance Analysis and Verification of Structural Improvement SI Junde 2023, 48(16): 80-85.  DOI: 10.16638/j.cnki.1671-7988.2023.016.016 Abstract ( )   PDF (3396KB) ( )   In this paper, the frontal crash safety performance of a 12 m coach is examined and studied using numerical simulation and experimental approaches. According to the analysis results, the front structure of the original coach is enhanced and constructed, including the collision energy absorber, steering wheel forward flip structure and through support structure. Finally, the improved coach is verified by designing different crash speeds and overall vehicle mass. The results indicated that the improved solution can effectively reduce the deformation of the front structure of the coach, protect the driver's living space from being invaded and reduce the passenger injury value; the passenger damage exceeds the standard at a crash speed of 50 km/h, nevertheless the upgraded structure can meet the crash safety standards for various load states at a crash speed of 30 km/h. The research results have good engineering application value for improving the passive safety of coaches. References | Related Articles | Metrics

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Study on the Emission Characteristics of Biodiesel on the Fine Particles Number in Diesel Engines GUO Yachen 2023, 48(16): 86-90.  DOI: 10.16638/j.cnki.1671-7988.2023.016.017 Abstract ( )   PDF (1235KB) ( )   A heavy-duty diesel engine that meets the current China Ⅵ emission standards is selected to run pollutant emission test on the engine test bench, used two fuels including B7 diesel and B20 diesel, with emphasis on the analysis of fine particulate number (PN) emission. The results show that the specific emission of PN10 in each cycle is 72%～132% higher than that of PN23 when the two biodiesel fuel are used, which is similar to that when diesel is used as fuel. With the increase of the volume ratio of two kinds of biodiesel, PN23 and PN10 in each cycle basically showed a downward trend, but the PN emission proportion of particle size 10～23 nm is still large. At the start-up stage of cold world harmonized transient cycle (WHTC), PN10 of B20 diesel is higher than that of B7 diesel, which may be related to the fact that the density and kinematically viscosity of biodiesel are higher than that of petrochemical diesel. Further optimization of atomization of injector should be considered when using biodiesel. References | Related Articles | Metrics

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The Effect of Vehicle Fan Dynamic Balance to Vehicle Interior Noise XIE Mingrui1,2 2023, 48(16): 91-94.  DOI: 10.16638/j.cnki.1671-7988.2023.016.018 Abstract ( )   PDF (1031KB) ( )   In order to solve the idling interior noise problem of a commercial vehicle, this paper identifies the noise frequency peak that has a significant impact on the idling interior sound quality of the vehicle through the frequency analysis method of the idling vehicle interior noise. Combined with the physical characteristics of the dynamic balance of the fan rotor, the three-point weighting method is used to build the engine electronic fan dynamic balance test bench. Through frequency calculation, it is confirmed that the fan is the direct excitation source of the roaring noise in the idling vehicle of this model. The results of the fan and interior noise test confirmed the correlation between the dynamic balance value and the vehicle interior noise, and formed a complete target definition method for the dynamic balance value of the electronic fan. Finally, by reducing the dynamic balance value of the fan, the noise effect in the vehicle is significantly improved, and it provides a certain reference for the development of noise, vibration, harshness (NVH). References | Related Articles | Metrics

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One-dimensional and Three-dimensional Co-simulation of an Electric Drive Cooling System ZHOU Tao 2023, 48(16): 95-98.  DOI: 10.16638/j.cnki.1671-7988.2023.016.019 Abstract ( )   PDF (1017KB) ( )   In order to improve the simulation efficiency and accuracy of the vehicle thermal management system, this paper takes an electric drive cooling system as an example, adopts the onedimensional and three-dimensional co-simulation method, obtains the performance parameters of the air side branch by three-dimensional simulation, and then imports the one-dimensional software for calculation, and evaluates the minimum flow required by the electric drive cooling branch. Finally, it is determined that when the existing fan and radiator are used, the electric drive flow must be at least 16 L/min to meet the requirement that the cooling system ≤100 ℃ References | Related Articles | Metrics

Process·Materials

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Cracking Analysis of Hollow Stabilizer Bar LI Wei 2023, 48(16): 99-103.  DOI: 10.16638/j.cnki.1671-7988.2023.016.020 Abstract ( )   PDF (4926KB) ( )   34MnB5 hollow stabilizer rod showed delayes cracking phenomenon after assembly, and shows multi-source characteristics. The surface trace analysis, fracture analysis, metallogra- phic structure and hardness analysis, failure statistics and production process analysis of the hollow stabilizer bar are carried out in this paper. The results show that the fracture is related to the shaping process, the corrosion of the inner surface of the hollow stabilizer rod and its high tempering hardness. The failure form belongs to the corrosion cracking of tempered martensitic structure caused by residual stress generated by calibration. References | Related Articles | Metrics

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Body Color Development and Application for Passenger Vehicles Based on Plackett Burman Screening Factor Design HE Xu 2023, 48(16): 104-108.  DOI: 10.16638/j.cnki.1671-7988.2023.016.021 Abstract ( )   PDF (961KB) ( )   In order to improve the independent development ability of new colors in Chinese passenger vehicle industry, through the analysis of the color demand for the appearance color of Chinese passenger vehicles, combined with the research and application of new colors, new effect coatings and new processes in the field of body coating in recent years, this paper discusses the application of Plackett Burman screening factor design in the independent development of new process color of passenger vehicles from the perspective of the whole life cycle of new colors and the way and method of independently developing new colors. It can provide a scientific analysis method for the development of new colors for passenger vehicles in China. References | Related Articles | Metrics

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Fault Diagnosis Method of Magnetic Switch Signal of Fixture Based on Touch Screen DING Yongjie 2023, 48(16): 109-112.  DOI: 10.16638/j.cnki.1671-7988.2023.016.022 Abstract ( )   PDF (3063KB) ( )   The welding fixture is a kind of tooling for positioning and fixing the body-in-white, which is mainly composed of air cylinder, air pipe, valve island, magnetic switch, operation button box, etc. The welding fixture is difficult to locate quickly due to the large number of magnetic switches after the electrical signal failure, resulting in long maintenance processing time. Based on this problem, this paper analyzes the control mode of the fixture and the application technology of the touch screen, and designs a diagnosis method that can quickly reflect the status of the magnetic switch signal of the fixture to the human machine interaction (HMI), and establishes a 3D view and status graph on the HMI to quickly diagnose the magnetic switch signal fault of the fixture, reduces the downtime of the equipment, and provides necessary guarantee for production efficiency. References | Related Articles | Metrics

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Application of Genetic Algorithm in Production Line Balance ZHANG Guoxin 2023, 48(16): 113-118.  DOI: 10.16638/j.cnki.1671-7988.2023.016.023 Abstract ( )   PDF (1914KB) ( )   In order to solve the problem of time loss caused by the imbalance between the production lines on the right side of the assembly line, a production line balance optimization model is established to meet the process constraints and improve the overall efficiency of the production line. The six core elements of the job combination are job content, job hours, fixed station, job site, immediate job and job tool. As long as the constraints are added to the above content, the genetic algorithm is used, and the Python programming language is used to calculate the target solution that meets the constraints, the job combination result of the line body optimization can be obtained. Taking the assembly line on the right side of the production line as an example for application analysis, after program optimization, the line balance rate increased from 81.3% to 95.1%; according to the combined optimization scheme of the program output, the line body test is carried out, and it is found that the line body balance rate is 93.8%, which is significantly improved compared with that before optimization, and the rationality and effectiveness of the optimization model are verified. References | Related Articles | Metrics

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Application of 3D Digital Process Platform in Process Development Process FU Kaiqiang 2023, 48(16): 119-123.  DOI: 10.16638/j.cnki.1671-7988.2023.016.024 Abstract ( )   PDF (1359KB) ( )   Process development runs through the whole process of product development to manufacturing, and plays an important role in connecting the preceding and the following. Based on the current situation of the enterprise, various improvement points in the process development process are analyzed and summarized, such as information interaction problems, virtual simulation data problems, etc. According to the characteristics and functions of 3D digital process platform, the structured process scheme, information platform construction scheme and basic data improvement scheme are proposed. Analyze various problems that need to be solved in advance in the process of ensuring the smooth implementation of the system. Through the implementation of the 3D digital process platform project, the penetration from product process to factory process is realized, and all aspects of digital process design are opened up. References | Related Articles | Metrics

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The Application Prospects of Aluminum Conducting Wire in Passenger Vehicle ZHOU Bin 2023, 48(16): 124-128.  DOI: 10.16638/j.cnki.1671-7988.2023.016.025 Abstract ( )   PDF (1415KB) ( )   The weight of fuel vehicle harness weight is about 30 kg and the purchasing cost is about 4 000 RMB, if use aluminum conducting wire instead of copper wire to make wiring harness, it will reduce the weight, improve fuel economy, improve emissions and reduce the cost of wiring harness. However, there are still some problems in the process of aluminum conducting wire crimping, welding, wiring assemble process and so on. In order to solve these problems and popularize the aluminum wire harness, some suppliers have also adopted new processes, new equipment and computer-aided design optimization, etc. These new technologies can effectively improve the existing problems of aluminum conducting wire, and create the conditions for the popularization of aluminum conducting wire. At the end of this paper, a simple prospect of the future use of aluminum conducting wire is made. References | Related Articles | Metrics

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Realization of Servo Welding Clamp Cap Changing Early Warning Function Based on Siemens VB Script RAO Wangfei 2023, 48(16): 129-133.  DOI: 10.16638/j.cnki.1671-7988.2023.016.026 Abstract ( )   PDF (2177KB) ( )   Robot servo welding tongs are important equipment for welding the cab of the body in white in the welding workshop. During welding, the electrode cap on the welding tongs needs to be replaced manually due to wear. However, due to the limitations of the system, the robot does not have the early warning function when executing the automatic request for the cap change procedure. When the operator does not handle it, it will cause the robot to wait in the position of changing the cap, this will affect the production efficiency. This article will focus on the function of using the VB script of the Siemens HMI. Through the written VB program, when the robot is about to execute the cap change program at the end of the next workflow, the touch screen will pop up a prompt screen, which contains the robot station information and the information about the cap change, to remind the operator of the need to prepare tools and auxiliary materials in advance, achieve the function of warning and reminding of servo welding tongs cap change of welding robot. References | Related Articles | Metrics

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Lightweight Design of Spline Shaft Fork of Heavy Commercial Vehicle Drive Shaft XU Yong 2023, 48(16): 134-137.  DOI: 10.16638/j.cnki.1671-7988.2023.016.027 Abstract ( )   PDF (2578KB) ( )   In order to realize the lightweight of slip shaft yoke, the slip shaft yoke is optimally designed by friction welding of yoke and thick wall seamless steel tube, the 3D model is drawn, and the force of transmission shaft assembly is analyzed by using the finite element analysis. The slip shaft yoke is optimized and improved according to the analysis results, and the verification analysis is carried out to ensure that the strength of lightweight slip shaft yoke meets the design requirements. References | Related Articles | Metrics

Automobile Education

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Volkswagen Passat Wiper System Working Principle Analysis and Troubleshooting HAN Qiang 2023, 48(16): 138-142.  DOI: 10.16638/j.cnki.1671-7988.2023.016.028 Abstract ( )   PDF (1322KB) ( )   The malfunction of the wiper system will affect the safety of the vehicle. In order to strengthen the understanding of the structure principle of the wiper system and train the ability of standardized fault diagnosis and removal, this paper introduces the basic composition and working principle of the wiper system of Volkswagen Passat, analyzes the control circuit of the wiper system, summarizes the troubleshooting process of the wiper system, and combines actual vehicle fault cases. This paper expounds the idea of fault analysis and solution, finally confirms the fault point and eliminates it, and provides a kind of idea and method for maintenance personnel to troubleshoot the wiper system of this model. References | Related Articles | Metrics

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Teaching Practice of Body Welding Technology in the Perspective of Curriculum Ideology and Politics YAO Xuefeng 2023, 48(16): 143-147.  DOI: 10.16638/j.cnki.1671-7988.2023.016.029 Abstract ( )   PDF (1033KB) ( )   Curriculum ideology and politics is the main channel for vocational colleges to carry out the fundamental task of moral education, and is an important measure to build a "big ideology and politics" education system. This paper first expounds the ideological and political background of the body welding technology course, and carries out the research on the education objectives, education contents, education methods and education mechanism. Based on the follow-up investigation of the practice results, it summarizes the ideological and political construction ideas of the body welding technology course by implementing the teacher team, updating school-based teaching materials, innovating teaching methods and improving the evaluation system. Practice has proved that the ideological and political implementation of the body welding technology course has effectively promoted the course reform and improved the effect of "three full education" in vocational colleges. References | Related Articles | Metrics

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Teaching Reform of Multi-dimensional Automobile Structure with CDIO Integration of Theory and Practice FU Qiang 2023, 48(16): 148-151.  DOI: 10.16638/j.cnki.1671-7988.2023.016.030 Abstract ( )   PDF (1130KB) ( )   In view of the problems existing in the teaching methods of automobile structure theory and practice, the conceive design implement operate (CDIO) theory practice integration teaching mode is redesigned. The multi-dimensional teaching method of CDIO engineering education and the field teaching space of the immersive theory and practice integration laboratory are adopted to enable students to recognize structural physical parts in the real world and realize the seamless connection between theoretical teaching and experimental teaching. Through discussion group communication on project design problems, teaching summary, classroom assessment and practice assessment, the firm grasp of basic knowledge and the ability to solve complex problems are improved. Through the practice of automobile structure teaching case, the teaching reorganization score is significantly higher than that of the comparison group, which verified that the new mode of multi-dimensional teaching based on on-site theory and practice effectively improved the accuracy of students' knowledge in the classroom, and enhanced the initiative of professional knowledge learning and engineering design ability. References | Related Articles | Metrics

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Research and Practice on the Ideological and Political Implementation Path of the Course —Taking the Automobile Marketing Practice Course as an Example HUANG Chaoqun 2023, 48(16): 152-155.  DOI: 10.16638/j.cnki.1671-7988.2023.016.031 Abstract ( )   PDF (948KB) ( )   The implementation of ideological and political education in courses is the requirement of "great ideological and political education" under the thought of "three complete education". For course teaching, teaching objectives should include knowledge objectives, skills objectives and ideological and political objectives. This paper proposes to explore the ideological and political elements through national industry policies, professional post capabilities, industry current events and celebrity stories, talent training goals, course goals, and so on. Taking the automobile marketing practice course as an example, it explores and practices the "three classroom" collaborative education model that combines offline and online, enjoys learning before class, guides learning in class, and expands after class. References | Related Articles | Metrics

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Reform and Practice of "Theory-Virtual-Reality" Talent Training Mode for Intelligent Connected Automobile Technology Specialty XUAN Zhaozhen 2023, 48(16): 156-160.  DOI: 10.16638/j.cnki.1671-7988.2023.016.032 Abstract ( )   PDF (1174KB) ( )   At present, the automobile industry is characterized by electrification, intelligence, networking and sharing, and is undergoing rapid transformation and upgrading. It is of great significance for vocational colleges to reform the talent training mode to adapt to the new changes in talent demand caused by industrial upgrading. This paper takes the intelligent connected vehicle technology specialty as the research object, summarizes the new problems in the process of professional talent training caused by the transformation and upgrading of the automobile industry, proposes solutions from the construction of professional training base, professional talent trainingmode and supporting mixed teaching mode, proposes a three-dimensional,virtual and real combination mixed teaching mode, and constructs a theory-virtual-reality talent training mode based on the virtual simulation training base. The practice shows that these reforms have solved the problems existing in the practical teaching of the intelligent connected vehicle technology specialty and are helpful to improve the students' professional ability and comprehensive quality. References | Related Articles | Metrics

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The Exploration of Progressive and Innovative Engineering-training Course Implementaion Based on Specialized Direction of Intelligent Vehicle Engineering ZHANG Jianheng 2023, 48(16): 161-164.  DOI: 10.16638/j.cnki.1671-7988.2023.016.033 Abstract ( )   PDF (1019KB) ( )   Intelligent vehicle is an emerging industry under the background of artificial intelligence, which brings the shortage of talents in the intelligent vehicle industry increasingly prominent. The traditional practical teaching system of vehicle engineering is difficult to meet the talent demand of the intelligent vehicle industry. Aiming at the teaching program of intelligent vehicle major, and integrating the rich teaching resources of the engineering training center of our school, the innovative practice course system of layer-advanced engineering training of intelligent vehicle is established.With the goal of improving students' practical operation ability, innovative design ability and comprehensive quality, a teaching platform of basic engineering training, intelligent vehicle innovation practice, hardware practice and real vehicle practice is built. The operational, sustainable and improved practice teaching mode is explored. The practice shows that the intelligent vehicle practice course carried out by the engineering training center can improve students' labor awareness and practical ability, broaden the subject thinking, consolidate professional knowledge, and consolidate the ability to solve problems. To contribute to the training of intelligent vehicle talents in China. References | Related Articles | Metrics

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Research of Project-based Teaching Mode Integrated with "Post Course Competition Certificate" —Taking Mechanical Transmission Design Course as an Example QI Jing 2023, 48(16): 165-170.  DOI: 10.16638/j.cnki.1671-7988.2023.016.034 Abstract ( )   PDF (3713KB) ( )   The purpose of this paper is to take the Mechanical Transmission Design course as the pilot, set the course content to project teaching as the goal, actively match the employers' requirements on the ability of the job, and create the project teaching course. Centering on the examination standard of 1+X professional grade certificate, combined with the course integration scheme of automobile "intelligent manufacturing system integration and application 1+X certificate" and the course integration scheme of "fuel vehicle assembly and adjustment 1+X certificate", it is integrated into the syllabus of Mechanical Transmission Design course. Actively link the characteristics of college students mechanical Innovation design competition and other industrial competitions, and explore the integration of extracurricular practice competition projects into the implementation process of mechanical transmission design teaching. References | Related Articles | Metrics

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Ideological and Political Courses Construction and Teaching Reform Practice of Automobile Construction I SUN Yuechao 2023, 48(16): 171-175.  DOI: 10.16638/j.cnki.1671-7988.2023.016.035 Abstract ( )   PDF (1702KB) ( )   In view of the training goal of applied talents of automobile service engineering major and the teaching characteristics of automobile construction course, and in the construction of the provincial first-class undergraduate course Automobile Construction, how to improve the teaching effect is the problem that the teachers of the course group must solve. This paper takes Automobile Construction I as an example to integrate design its content with ideological and political elements, and combining the first-class course construction with ideological and political courses, knowledgeimparts with value guidance, and professional knowledge with professional quality. To realize the dual education of students' professional knowledge and character accomplishment, so that students can receive the education of socialist core values imperceptibly while acquiring the knowledge of automobile construction, and independently form the professional accomplishment of professionalism, pragmatism, unity and progress, so as to achieve the purpose of teaching and educating people in unity with talents. References | Related Articles | Metrics

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Influence on Instructors and Competitors after the Reform Pilot of "Automobile Technology" in the National Vocational College Skills Competition MIAO Liang 2023, 48(16): 176-179.  DOI: 10.16638/j.cnki.1671-7988.2023.016.036 Abstract ( )   PDF (1201KB) ( )   In 2020, the Ministry of Education carried out a reform pilot of the "automobile technology" event in the higher vocational group of the National Vocational College Skills Competition. This paper mainly compares the competition rules, contestants' reports and the competition questions used in the national competition of the "automobile technology" event before and after the reform pilot of the national vocational college skills competition, summarize the changes and unchanges of the "automobile technology" event in many aspects, such as the event purpose, the event content, the way of competition, the contestant report and the scoring table, analyzed the impact on instructors and contestant. It is proposed to strengthen the level of instructors in the "automobile technology" event by building excellent teams, making up knowledge loophole,familiarizing with competition equipment, and inviting experts to give lectures, improve the level of competitors by setting up an automobile technology competition class, intensifying the process assessment, integrating the spirit of craftsman, improving physical fitness and strengthening psychological counseling. Finally, it will improve the performance of the contestants in the "automobile technology" event. References | Related Articles | Metrics

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Teaching Reform of Automobile Theory Course under the Background of New Engineering and Engineering Education Certification LI Zhiyuan 2023, 48(16): 180-183.  DOI: 10.16638/j.cnki.1671-7988.2023.016.037 Abstract ( )   PDF (1103KB) ( )   Automobile theory course is one of core curriculums of vehicle engineering for colleges and universities to train high-quality vehicle engineering professionals, and is also the basis for guiding automotive professionals to engage in automotive engineering practice. However, there are some shortcomings existing in the current traditional teaching methods, which can not meet the requirements of vehicle engineering personnel training in the new era. Based on the connotation of new engineering and engineering education certification, the "one center, two directions and six combinations" teaching philosophy is proposed in this paper, and the teaching system of automobile theory course is constructed. Meanwhile, the corresponding teaching reform practice has been carried out. It has effectively stimulated students' interest in learning, improved the teaching effectiveness, enhanced students' professional quality and engineering application ability, and assisted the transformation and upgrading of vehicle engineering in new engineering. References | Related Articles | Metrics

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Practice of Training Mode for Automotive Technology Major Talents Based on CDIO Concept JIA Deshun 2023, 48(16): 184-187.  DOI: 10.16638/j.cnki.1671-7988.2023.016.038 Abstract ( )   PDF (1008KB) ( )   With the development of high and new technology and modern manufacturing industry in China, advanced technical talents are urgently needed in all sectors of society. Based on the automotive technology major of Luoyang Polytechnic, which has many years of experience in running schools, this paper puts forward a training mode of technical talents based on the concept of conceive, design, implement, and operate (CDIO). Taking automotive technology major as an example, this paper explores the significance of the concept to the training of technical talents in higher vocational colleges by studying the curriculum system and training mode. This concept can make better use of the school's teaching resources and teaching concepts, and cultivate advanced technical talents with innovative spirit to meet the needs of society and enterprises. References | Related Articles | Metrics

Standards·Regulations·Management

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Research on Demand Forecast of Online Car-hailing Based on Deep Learning QUAN Yukun 2023, 48(16): 188-193.  DOI: 10.16638/j.cnki.1671-7988.2023.016.039 Abstract ( )   PDF (1474KB) ( )   The demand forecasting of online car-hailing is a typical time series forecasting task. The accurate demand forecasting can help the platform to arrange the order and plan the route reasonably, so as to reduce the empty driving rate of ride-hailing. It has important research significance. In this paper, long short-term model (LSTM) and gated recurrent unit (GRU) are used to forecast the demand of online car-hailing, demand for online car-hailing within a week and a month and its changes, building demand forecasting models based on LSTM and GRU, using historical data to predict future demand, and using Geohash code to map Xi'an by region, the data are matched with the grid to get the summary data, and the linear model is used for the control test. The results show that the performance of LSTM and GRU is better than that of the linear model in the demand forecast of online car-hailing, the prediction accuracy of LSTM is higher than that of LSTM. References | Related Articles | Metrics

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Study on the Development of Road Passenger Terminal in Henan Province REN Jing 2023, 48(16): 194-197.  DOI: 10.16638/j.cnki.1671-7988.2023.016.040 Abstract ( )   PDF (1168KB) ( )   With the rapid development of high-speed railway, civil aviation, online car hailing and other external modes of transport, road passenger transport market is facing serious challenges. As the infrastructure of highway passenger transport, through analyzing the current problems and difficulties in the production and operation of Henan passenger terminal, the development suggestions are put forward in order to provide reference for the future development path of Henan highway passenger terminal. In order to improve the dismal management status of highway passenger terminal, we need many joint efforts. Government departments should constantly strengthen guidance, refine policies, guide social capital participation, and support the development of highway passenger terminals in various forms and channels. Local terminal operators need to innovate new ideas of construction and management. Based on the basic function of passenger station distribution, they should expand the multi-business operation of highway passenger station and realize the sustainable development of the terminal. References | Related Articles | Metrics