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14 April 2023, Volume 48 Issue 7 Previous Issue    Next Issue
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Use and Maintenance
Automobile Education
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New Energy Vehicle

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Experimental Study on Electrical Performance of Gradient Anode SOFC for Vehicles FU Pei 2023, 48(7): 1-8.  DOI: 10.16638/j.cnki.1671-7988.2023.07.001 Abstract ( )   PDF (2789KB) ( )   In order to promote the transformation of China's energy structure and solve the problem of environmental pollution, the development of hydrogen fueled solid oxide fuel cells (SOFC) is an effective way. Gradient anode design with varying anode microstructure is expected to improve the SOFC performance. To explore the electrical performance of the gradient anode SOFC, an experimental system for measuring the electrical performance of the SOFC button cell was built. By regulating the working conditions of the cell, the open circuit voltage and discharge characteristics of the gradient anode SOFC were measured under different working temperature and different inlet fuel flow rate. The results show that the output voltage and output power density of the gradient anode SOFC increase with the increase of inlet fuel flow rate, and the electrical performance of the cell remains basically unchanged when the inlet fuel flow rate exceeds 100 mL·min-1 . As the operating temperature increases, the open circuit voltage of the gradient anode SOFC decreases, and the output voltage and the output power density of the cell increase. When the cell is operated at 800 ℃ and the inlet fuel flow rate is 125 mL·min-1 , the maximum power density of the gradient anode SOFC reaches 0.31 W·cm -2 . References | Related Articles | Metrics

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Introduction and Fault Diagnosis of Heavy Electric Truck DC Charging WEI Jiajia 2023, 48(7): 9-13.  DOI: 10.16638/j.cnki.1671-7988.2023.07.002 Abstract ( )   PDF (1840KB) ( )   With the development of low-carbon energy in recent years, especially in the transportation industry, heavy electric trucks are becoming more and more popular. However, the normal charging of heavy electric trucks directly affects the daily operation of customers. At first, this paper introduces the composition of dc charging system, guiding principle and control strategy and sequence, on this basis, according to abnormal direct current (DC) charging problem, from the communication between the vehicle and charging pile, an abnormal connections and vehicle high voltage insulation problem is discussed in three aspects, and combining with the actual work vehicle debugging, maintenance process appeared some fault condition, and carries on the analysis. Finally, the methods and opinions of DC charging fault diagnosis and maintenance of heavy electric truck are proposed, hoping to provide help for users and maintenance personnel of heavy electric truck. References | Related Articles | Metrics

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Powertrain Mount Bracket Design Based on Topology and Topography Optimization SUN Bin 2023, 48(7): 14-18.  DOI: 10.16638/j.cnki.1671-7988.2023.07.003 Abstract ( )   PDF (1430KB) ( )   In view of the problem of insufficient dynamic stiffness of the powertrain suspension bracket nianof a certain type of pure electric bus, the modal contribution method is used to find out the key mode. The topology and topography of the mount bracket are jointly optimized for multiple targets with weighted flexibility and weighted mode minimization. The results show that the dynamic stiffness of the mount bracket is increased while achieving a lightweight effect. References | Related Articles | Metrics

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Lightweight Design of Front Subframe of New Energy Vehicles WU Chudong 2023, 48(7): 19-25.  DOI: 10.16638/j.cnki.1671-7988.2023.07.004 Abstract ( )   PDF (12178KB) ( )   For the purpose of performance and lightweight optimization, this paper establishes the finite element model of the steel subframe, obtains its constraint mode, and carries out strength analysis on the typical working conditions of forward emergency braking, limit steering, and single-side deep pit crossing, and carries out dynamic stiffness analysis on the installation point of swing arm. Then, based on the hard point of the steel front subframe of the vehicle model, through the global optimization strategy of genetic algorithm. The lightweight scheme of extruded aluminum front subframe was designed, and the weight was successfully reduced by 34%, which has certain reference significance. References | Related Articles | Metrics

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NVH Performance Analysis of New Energy Vehicle Range Extender WU Bin 2023, 48(7): 26-29.  DOI: 10.16638/j.cnki.1671-7988.2023.07.005 Abstract ( )   PDF (4157KB) ( )   The range extender of new energy vehicles is generally a special and efficient engine. The engine has high compression ratio and fast combustion speed. In this paper, the influence of engine combustion performance on noise, vibration, harshness (NVH) is analyzed. The maximum combustion peak pressure and steep pressure rise rate will cause the increase of vibration and noise. The maximum combustion peak pressure is close to 6 bar, the maximum sound pressure is 0.16 Pa, and the maximum vibration acceleration is about 3 m/s2 . The maximum combustion peak pressure is about 4 bar, the maximum sound pressure is 0.06 Pa, which is reduced by 62.5 %, and the vibration acceleration is 1.5 m/s2 , which is reduced by 50%. References | Related Articles | Metrics

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Coordinated Yaw Stability Control Strategy of Distributed Drive Electric Vehicle Based on Nash Game LIAO Xuedi 2023, 48(7): 30-34.  DOI: 10.16638/j.cnki.1671-7988.2023.07.006 Abstract ( )   PDF (1061KB) ( )   In order to improve the lateral stability of hub motor driven electric vehicles under dangerous conditions such as high speed and low adhesion, this paper proposes a cooperative control strategy based on Nash game. The upper and lower two-layer control structure is used to design the stability control strategy. In the upper layer, Nash game coordination control strategy is introduced to determine the front wheel angle and additional yaw moment, and track the expected yaw rate and the centroid sideslip angle. The lower layer distributes the driving torque of the four wheels according to the axle load ratio. The double lane change simulation test under dangerous conditions is carried out on the joint simulation platform of CarSim/Simulink. The results show that compared with the active front wheel steering control only, the maximum error of yaw rate is 2.25 °and the maximum error of centroid sideslip angle is 0.55 ° when the coordinated control strategy based on Nash game is adopted when driving at 75 km/h on wet asphalt pavement, and the good path tracking performance is maintained. By properly coordinating the actions of active front steering (AFS) and direct yaw-moment control (DYC), the control strategy proposed in this paper can effectively improve the lateral stability and ensure the normal driving of vehicles under dangerous driving conditions. References | Related Articles | Metrics

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Study on the Effect of Driving Style on the Energy Consumption of Pure Electric Buses PING Siliang 2023, 48(7): 35-41.  DOI: 10.16638/j.cnki.1671-7988.2023.07.007 Abstract ( )   PDF (897KB) ( )   Pure electric buses have the problem of limited range in actual operation, and the driver's driving behavior has a large impact on energy consumption. In order to further investigate the influence of driver driving style on energy consumption, this paper uses global positioning system (GPS) speedometer Pro to collect pure electric bus driving data, and uses K-Means mean clustering method to classify driving style into three categories: aggressive, normal and conservative based on acceleration standard deviation, and then based on theoretical energy consumption model through MATLAB to get the energy consumption of various driving styles, and analyze the influence of driving style on the energy consumption of each driving segment of pure electric buses. Then, the energy consumption of each driving style was obtained by MATLAB based on the theoretical energy consumption model, and the influence of driving style on the energy consumption of eachdriving segment of pure electric bus was analyzed. The results show that the energy consumption increases and then decreases with the increase of the average speed when driving at a uniform speed, and it is not related to the driving style; when driving at a non-uniform speed, the energy consumption tends to decrease with the increase of the average speed, and the more aggressive the driving style is in the same average speed range, the higher the energy consumption, in which the normal driving style has better economy when driving at a single acceleration, and the conservative driving causes the energy consumption to increase when driving at an acceleration more than 24.8%, aggressive driving will lead to more than 47.6% increase in energy consumption when accelerating. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on ADAS Function and Fault Diagnosis Test Based on Hardware in the Loop Platform HOU Kunfeng 2023, 48(7): 42-46.  DOI: 10.16638/j.cnki.1671-7988.2023.07.008 Abstract ( )   PDF (855KB) ( )   Advanced driving assistance system is a complex intelligent control system, which needs to be fully verified and tested from system development to landing application. Hardware in the loop simulation technology can well solve the problems of high cost, complex test scenarios, long cycle and high risk of real vehicle verification test. In this paper, Vector CANoe software and hardware and Carmaker are used to build a hardware in the loop simulation platform, which realizes advanced driving assistance system (ADAS) control algorithm and fault diagnosis verification. The experimental results show that the hardware in the loop platform can verify the ADAS control algorithm, which has certain reference value for solving the problem of ADAS test. References | Related Articles | Metrics

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The Simulation Analysis of Intelligent Networked Vehicles Based on MATLAB JIA Dongming 2023, 48(7): 47-51.  DOI: 10.16638/j.cnki.1671-7988.2023.07.009 Abstract ( )   PDF (1562KB) ( )   The MATLAB autopilot toolbox is used for simulation to provide more reliable data support for the normal operation of intelligent networked vehicles. This paper introduces the scene building method of MATLAB, and explains in detail the road, participants and the usage of sensor generating function used in the scene building. Simulink simulation system is built by using vehicle longitudinal simulation model in toolbox, and the vehicle tracking speed is set by step input, and the response of vehicle during acceleration and deceleration is simulated. More clearly reflect the car in the speed tracking of the acceleration and deceleration and the final speed changes. References | Related Articles | Metrics

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Analysis of Route Planning Algorithm Based on Collecting Road Network Map WANG Xuepeng 2023, 48(7): 52-56.  DOI: 10.16638/j.cnki.1671-7988.2023.07.010 Abstract ( )   PDF (1229KB) ( )   Autonomous driving generally consists of perception, decision-making, planning, and control modules. With the deepening of research, the role of decision-making and planning in the system becomes more and more obvious. The first thing to be solved in the planning process is to deal with various traffic scenarios. Come up with a reasonable decision-making plan. This paper proposes a design idea that separates path planning and velocity planning for real-time path planning for autonomous driving. Firstly, based on the high-precision map of a closed scene, a number of alternative paths are generated using sampling methods, and the best path is selected in combination with collision detection. Secondly, the generated path is planned based on the comfort level to provide a speed plan that satisfies the comfort, and finally passed Simulation verifies the effectiveness of this method. References | Related Articles | Metrics

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Research on Intelligent Vehicle Lane Change Based on Reference Line Optimization Algorithm YU Jie 2023, 48(7): 57-60.  DOI: 10.16638/j.cnki.1671-7988.2023.07.011 Abstract ( )   PDF (1052KB) ( )   Referenceline,trajectory planning and lateral control are important components in intelligent vehicle. Excellent referenceline is required as benchmark for intelligent vehicle and to meet smooth and compact. Trajectory planning and lateral control are required when vehicle lane change. Smooth and compact algorithm are proposed in this paper to optimize the referenceline. Quintic polynomial curve is used in this paper to plan trajectory, and linear quadratic regulator (LQR) is used to control lateral lane change. Finally, the effect of lane change is good. The feasibility and superiorty of the algorithm are verified by the simulation software CarSim and Simulink. References | Related Articles | Metrics

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System Design of Home Parking System PAN Ning 2023, 48(7): 61-65.  DOI: 10.16638/j.cnki.1671-7988.2023.07.012 Abstract ( )   PDF (1241KB) ( )   With the progress of sensors, hardware and algorithms, automatic parking systems have gradually updated from semi-automatic parking, full-automatic parking to parking systems running in the whole parking lot. The automatic parking systems running in the whole parking lot are divided into two categories by scenes: the valet parking system for shopping malls and the home parking system for fixed parking space. The system design of a home parking system is proposed in this paper, which include the hardware component, function description and working flows. Drivers need to drive once in the parking lot to establish the map and the vehicle reference trajectory. Then the vehicle can drive from the parking lot entrance to the pre-set parking spot automatically. The relevant key technologies are discussed as regards to the characteristics of the proposed home parking system, such as the simple map establish process, the high accuracy parking and the obstacle avoidance procedure. Finally, the system is summarized and prospected. References | Related Articles | Metrics

Design and Research

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Research on HEV Fuzzy Control Strategy Based on Driving Intent Recognition LIAO Pengcheng 2023, 48(7): 66-70.  DOI: 10.16638/j.cnki.1671-7988.2023.07.013 Abstract ( )   PDF (1354KB) ( )   In this paper, the fuel economy and control strategy of hybrid vehicles are studied in parallel hybrid vehicles, and the fuzzy control strategy of driving intent recognition is adopted, and the joint simulation experiment is carried out by MATLAB platform and CRUISE software. Simulation results show that compared with the logical threshold control strategy, the fuzzy control strategy of driving intent recognition can significantly improve the fuel economy of the whole vehicle, and verify the effectiveness and practicality of the proposed control strategy. References | Related Articles | Metrics

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Development and Application of Commercial Vehicles Electrical Inspection System LIN Zhe 2023, 48(7): 71-75.  DOI: 10.16638/j.cnki.1671-7988.2023.07.014 Abstract ( )   PDF (1079KB) ( )   In the production process of commercial vehicles, the qualification of electrical functions is an important part of the assembly quality of vehicles. The information collection, storage and analysis of electrical inspection results are of great value to the design, production and delivery of vehicles. The application of information technology can reduce the cost of labor and materials. In order to improve the accuracy and timeliness of information collection, this paper explores the development of a data system for the detection of commercial vehicle electrical appliances, including two application scenarios. One is real-time detection data recording and uploading, which is developed using Kivy based android App; the other is database management, which uses MySQL to build a database, and compiles a PC terminal foreground interface based on Python to realize the collection and upload of the electric inspection data of android App, and the data management to the PC terminal, which fully meets the requirements of electric inspection, and the system runs well. References | Related Articles | Metrics

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Research and Implementation of Urban Bus Elevator Design LI Hua 2023, 48(7): 76-79.  DOI: 10.16638/j.cnki.1671-7988.2023.07.015 Abstract ( )   PDF (914KB) ( )   At present, the main means of transportation for the elderly is the city bus, but it is increasingly inconvenient for the elderly to travel by bus. From the perspective of the elderly travelling by bus, this paper designs a set of innovative elevator which does not change the function of the original bus walking ladder and is suitable for the elderly. This paper adopts the survey method and analysis method to study the problems. Firstly, it conducts field research on the elderly taking city buses and summarizes the existing problems. Then through the analysis of the current structure of the bus analysis, in the premise of not affecting the structure of the bus body, design a set of city bus elevator. And the bus walking ladder is redesigned, innovative design of a set of bus elevator. The bus walking ladder and elevator can be converted to each other according to the needs, which solves the problem that the elderly people are difficult to travel by bus. References | Related Articles | Metrics

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Simulation Analysis Method of Vehicle Powertrain Mounting Bracket YU Dongna 2023, 48(7): 80-83.  DOI: 10.16638/j.cnki.1671-7988.2023.07.016 Abstract ( )   PDF (1064KB) ( )   The powertrain mounting bracket was being simulation analysis on the structural strength. According to the matching of the vehicle power system, the dynamic loads of the limit, typical and failure conditions were input, and 18 representative investigation conditions were integrated and selected. Combined with the fact that the powertrain mounting bracket is a traditional rubber suspension formed by vulcanization of rubber bushing into a main and auxiliary spring structure, the linear and nonlinear loads are introduced into the finite element simulation method to accurately express the force transmission and action relationship. According to the characteristics of structural profiles and loading conditions to be a set of systematic and diverse. Simulation method which of the powertrain mounting bracket was being quickly verified on high accuracy. References | Related Articles | Metrics

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Design and Finite Element Analysis of Automobile Air Register LONG Yuelin 2023, 48(7): 84-87.  DOI: 10.16638/j.cnki.1671-7988.2023.07.017 Abstract ( )   PDF (1549KB) ( )   As one of the important functional parts of automobile interior trim, the design of air register determines whether the performance of automobile can meet the requirements of automobile attributes. This paper introduces the composition of the air register, its location and layout requirements in the design and development process, and the corresponding regulations that it needs to meet. It also introduces the matters needing attention and some important parameters of the knob, wheel and vane of the air register in the design process. In order to provide corresponding reference for the subsequent design of similar structures. According to the actual use of the vehicle, the air register is the high-frequency use area of passengers. The stiffness of the air register is analyzed by using the finite element analysis method. The analysis results show that the deformation of the air register is greater than the standard requirements, and the structure needs to be optimized. By increasing the diameter of the shaft on both sides of the vane, it is concluded that the stiffness of the air register vane meets the design requirements. Through the research of this paper, the mold repair cost caused by design defects can be reduced. References | Related Articles | Metrics

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Experimental Analysis of Electromagnetic Liquid Cooled Retarder LI Shalong 2023, 48(7): 88-91.  DOI: 10.16638/j.cnki.1671-7988.2023.07.018 Abstract ( )   PDF (1870KB) ( )   The double-salient electromagnetic liquid-cooled retarder has the advantages of fast response time, large torque at low speed, low surface temperature of the hydraulic retarder, and no thermal recession of the eddy current retarder. In this paper, the performance of the doubly salient electromagnetic liquid-cooled retarder is experimentally researched. retarder for comparison. The test results show that the maximum torque of the double salient electromagnetic liquid-cooled retarder in the highest braking gear is 1 880 Nm, the average response time of each braking gear is less than 0.6 s, the average thermal decay rate is less than 11%, and the transmission shaft speed is 400 r/min, the braking torque can reach 95% of the maximum braking torque, which provides a test basis for the application of the electromagnetic liquid-cooled retarder. References | Related Articles | Metrics

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Design Calculation of Tailgate Gas Spring Based on Excel LI Wei 2023, 48(7): 92-97.  DOI: 10.16638/j.cnki.1671-7988.2023.07.019 Abstract ( )   PDF (1293KB) ( )   In order to solve the problem of large amount of data and poor accuracy of forward design in the design of gas spring for suburban utility vehicle (SUV) vehicle tailgate, a structural mechanical model was built for the tailgate. The relevant torques about the tailgate were expressed as parameters with a single variable about the opening and closing angle of the tailgate through the theoretical formula. The calculation of the opening and closing force of the tailgate was realized through the formula editing function of Excel. The calculation process was simplified and the accuracy was also improved. The optimization method for the opening/closing force and the opening reliability of tailgate was provided. References | Related Articles | Metrics

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Modeling and Kinetic Characteristics Research of Porous Medium Laminated Beams PAN Kun 2023, 48(7): 98-103.  DOI: 10.16638/j.cnki.1671-7988.2023.07.020 Abstract ( )   PDF (1344KB) ( )   The application of porous materials is increasingly widespread, but due to the limitation of their own special pore structure, the strength of porous materials is not high. Laying carbon fiber cloth on the surface of porous media material can obtain the excellent comprehensive performance of porous medium material and the high strength of carbon fiber cloth simultaneously. The finite element method (FEM) is mostly used to analyze the mechanical properties of the porous laminated structure with carbon fiber cloth. Because of the particularity of porous structure, the calculation accuracy and efficiency of FEM are low. Based on the Biot theory and the lamination theory, combining the control equation of porous layer and carbon fiber cloth, the integrated first-order ordinary differential matrix governing equations of porous laminated beams with carbon fiber cloth under harmonic excitation are derived by considering the continuity condition between layers. Combined with the boundary conditions of the structure, the precise integration method with high precision is used to solve the integrated governing equations. The feasibility and correctness of the model are verified compared with the finite element model, and the dynamic characteristics of the porous laminate beam with carbon fiber cloth are also analyzed by the present method. References | Related Articles | Metrics

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Calculation and Optimization of Axle Load Distribution Based on Double Steering Bridge Truck Braking GUAN Shiwei 2023, 48(7): 104-108.  DOI: 10.16638/j.cnki.1671-7988.2023.07.021 Abstract ( )   PDF (1589KB) ( )   In order to solve the problems of tire wear and brake lock of double front axle trucks, a calculation model of axle load of double steering axle truck under braking state is established by using theoretical mechanics principle, and the accuracy of the model is verified by vehicle test. The error between the theoretical calculation value and the test measurement value is within 3%. Based on this model, the axle load distribution of a certain 8×4 truck is optimized by adjusting the suspension parameters, so that the axle load distribution is more reasonable in the static state or the braking state, so that its antilock brake system (ABS) can play a better effect. Through the test data, it is found that the maximum braking deceleration of the optimized vehicle increases by 1.3% and the braking distance decreases by 1.1%. The model and optimization method can be applied in engineering, which is of great significance to improve the braking performance of multi-axle truck. References | Related Articles | Metrics

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Influence of Torque on Fatigue Durability Simulation Based on Virtual Proving Ground QIU Mingmin 2023, 48(7): 109-115.  DOI: 10.16638/j.cnki.1671-7988.2023.07.022 Abstract ( )   PDF (2546KB) ( )   At present, virtual proving ground (VPG) is widely used because of its short development cycle and low cost. However, due to the certain difference between the multi-body simulation model and the actual model, the torque accuracy of the hard point can't be guaranteed, and the reliability of fatigue durability simulation based on the virtual proving ground is also unreliable. This paper selects the rear sub-frame and vehicle body as the research objects; extract the hard point load spectrum of the rear sub-frame and the vehicle body by VPG simulation; and use the torque and non-torque load spectrum for the fatigue durability simulation analysis respectively; compare and analyze the results of fatigue durability simulation analysis. The comparison results shows that the damage value ratio of fatigue durability simulation analysis by the torque and non-torque load spectrum is between 0.54～0.99. In general, the torque base on VPG has less influence of the result of fatigue durability simulation. Even though the torque accuracy can't be guaranteed, the overall results of fatigue durability simulation analysis will not be affected, which also proves that the fatigue durability simulation analysis based on VPG can be reliable. References | Related Articles | Metrics

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Main Pressure Design of Dual-clutch Automatic Transmission HCU KONG Qingle 2023, 48(7): 116-119.  DOI: 10.16638/j.cnki.1671-7988.2023.07.023 Abstract ( )   PDF (1189KB) ( )   In this paper, a method for the design of the main pressure of hydraulic control unit (HCU) is proposed. Preliminary design calculations are supplemented by AMESim system simulation analysis and fine-tuning of the parameters in the calculations. Then the design is confirmed by system testing. Finally, the test results are used to correct the influence of hydrodynamic forces and the influence of part manufacturing tolerances, and determine the tolerance range of the main pressure. This design method can be used for different main pressures required by the system. References | Related Articles | Metrics

Testing and Experiment

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Test Method for Photoaging of Automotive Polymer Materials Comparative Analysis CHEN Rui 2023, 48(7): 120-123.  DOI: 10.16638/j.cnki.1671-7988.2023.07.024 Abstract ( )   PDF (963KB) ( )   Sunlight irradiation is one of the main reasons for damaging automotive polymer materials. This paper adopts the method of comparative research, and compares the advantages, disadvantages and applicability of four light aging test methods: carbon arc lamp test method, fluorescent ultraviolet lamp test method, xenon arc lamp test method and metal halogen lamp test method, so that testers can adopt appropriate methods for light aging test, so as to shorten the test cycle, accurately evaluate product quality and quickly screen problem products. In order to ensure the accuracy of the test, this study also proposed the principles of spectral similarity, suitable temperature and humidity and how to evaluate the aging results from the aspects of appearance, color, physical properties and so on.Finally, it is concluded that xenon arc lamp test is becoming the mainstream light aging test method. References | Related Articles | Metrics

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A Test Method for Indirectly Testing the Fuel Saving Rate of Electronically Controlled Silicone Oil Fans HAN Peng 2023, 48(7): 124-128.  DOI: 10.16638/j.cnki.1671-7988.2023.07.025 Abstract ( )   PDF (1173KB) ( )   In order to effectively evaluate the fuel saving rate of the traditional silicone oil fan after optimizing it into an electronically controlled silicone oil fan, a test method for indirectly testing the fuel saving rate of the electronically controlled silicone oil fan based on the chassis dynamometer and the fan test bench was designed. Firstly, the relationship between the speed and energy consumption of the fan is measured on the fan test-bed. Secondly, the universal characteristic curve of fuel consumption, engine speed and resistance power is obtained by the universal characteristic test based on the chassis dynamometer, then the engine speed and the fan speed are collected and evaluated at every moment. Finally, the fuel-saving rate of the electric-controlled silicon oil fan is checked indirectly by using special software, combining with the curve of the fan energy consumption and the universal characteristic curve of the whole vehicle, the method was tested on a prototype vehicle. The research showed that the proposed test method for indirectly testing the fuel saving rate of electronically controlled silicone oil fans is effective and feasible. References | Related Articles | Metrics

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Analysis of the Effect of Door Inner Panel Thickness on Door Modal ZHANG Yichuang 2023, 48(7): 129-135.  DOI: 10.16638/j.cnki.1671-7988.2023.07.026 Abstract ( )   PDF (3632KB) ( )   In order to analyze the safety performance of automobile doors, improve the riding comfort and the vehicles lightweight door, the influence of the door inner panel thickness on the modal of the door was studied. Taking a front door of an automobile as the research object, a finite element model of the door is established in the finite element analysis software, and modal simulation analysis is conducted for the vehicle door. According to the different thickness of the door, modal simulation analysis of 5 kinds of working conditions are designed and conducted. The results show that with the increase of the inner panel thickness, the natural frequency of the door gradually increases and the modal vibration mode of the door changes regularly, which has guiding significance for the research of safety performance of automobile doors, riding comfort and vehicle lightweight. References | Related Articles | Metrics

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A Method for Measuring Relationship between Adhesion Coefficient and Slip Rate ZHAO Yongjie 2023, 48(7): 136-140.  DOI: 10.16638/j.cnki.1671-7988.2023.07.027 Abstract ( )   PDF (1526KB) ( )   The automobile anti-lock braking system (ABS) adjusts the wheel speed according to the adhesion coefficient and slip ratio curve to achieve the best braking effect. However, the adhesion coefficient and slip rate curves of different roads are different, and the peak value of adhesion coefficient and the corresponding optimal slip rate are also different. In order to achieve better ABS control effect for vehicles on different roads, a method for measuring adhesion coefficient and slip rate curve is proposed in this paper, which can calculate the adhesion coefficient and slip rate curve in real time. References | Related Articles | Metrics

Process and Equipment

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Analysis on Lightweight of Automobile Thin-walled Energy Absorbing Structure JI Siming 2023, 48(7): 141-144.  DOI: 10.16638/j.cnki.1671-7988.2023.07.028 Abstract ( )   PDF (1798KB) ( )   In this paper, CATIA and Hypermesh are used for 3D modeling and mesh generation, and ABAQUS and its subroutines are used for finite element analysis. The mechanical properties of the double cap energy absorbing structure under impact are analyzed to realize the lightweight. Aluminum silicon carbide composite is selected as a reference, compared with aluminum alloy and Q235 steel. The result shows that the energy absorption effect of aluminum silicon carbide is similar to aluminum alloy and there is little difference between Q235 steel and aluminum silicon carbide, but the weight is only 40% of Q235 steel, and the stability of aluminum based silicon carbide under medium velocity impact is better than aluminum alloy and Q235 steel. References | Related Articles | Metrics

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Strength Fatigue Analysis and Optimization of Axle Housing WANG Fujun 2023, 48(7): 145-148.  DOI: 10.16638/j.cnki.1671-7988.2023.07.029 Abstract ( )   PDF (2023KB) ( )   In this paper, taking the axle housing of our company as an example, the finite element analysis software ABAQUS is used to solve the problem, and the stress distribution of the axle housing is obtained. The finite element calculation results are imported into nCode software to evaluate the fatigue life of the axle housing, and the fatigue life value of the axle housing is obtained. According to the calculation results, the weak parts are optimized and improved to reduce the maximum stress value and improve the fatigue life. The calculation results of computer aided engineering (CAE) have been verified by the fatigue bench test, which ensures the accuracy of the calculation results. This study provides a basis for the design of similar products. References | Related Articles | Metrics

Use and Maintenance

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Fault Diagnosis and Troubleshooting of Pure Electric Vehicle —Taking Geely Emgrand EV300 Pure Electric Vehicle as an Example LAI Depeng 2023, 48(7): 149-153.  DOI: 10.16638/j.cnki.1671-7988.2023.07.030 Abstract ( )   PDF (1288KB) ( )   For common faults of pure electric vehicles, fault diagnosis and troubleshooting are conducted through fault recurrence. According to the idea of "fault phenomenon—fault analysis— fault diagnosis—fault summary", summarize the diagnosis and troubleshooting ideas for pure electric vehicles. Pure electric vehicle faults can be divided into two categories: "high-voltage system faults" and "AC slow charging faults". The high-voltage system involves many modules, such as the vehicle control unit (VCU) module, the positive temperature coefficient (PTC) thermistor module of the air conditioner, and the high-voltage wiring harness connection (high-voltage interlock). The failure of modules such as the power control unit local area network (P-CAN) affects high-voltage power on. The charging system involves an auxiliary control module (ACM) and a charging gun. Taking the Geely Emgrand EV300 (2017 model) as an example, this article analyzes the working principles of the low-voltage power supply system and high-voltage power-on system of pure electric vehicles, conducts a vehicle case study, and provides maintenance technicians with certain fault diagnosis solutions by analyzing common faults of pure electric vehicles. References | Related Articles | Metrics

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The Application of New Electronic Diagnosis Technology in Modern Automobile Maintenance GAO Yun 2023, 48(7): 154-159.  DOI: 10.16638/j.cnki.1671-7988.2023.07.031 Abstract ( )   PDF (6482KB) ( )   This paper will analyze and discuss the main features of modern automobile maintenance technology, explain the basic contents and application advantages of electronic diagnosis technology, and put forward effective ways to apply electronic diagnosis to modern automobile maintenance technology, so as to meet the development needs of automobile maintenance industry, improve the detection efficiency of automobile faults,optimize the accuracy of performance test, greatly improve the service life of automobiles and further increase the economic benefits. References | Related Articles | Metrics

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Diagnosis and Analysis of BYD Qin Hybrid Low-voltage Unenergized Fault ZHU Lusheng 2023, 48(7): 160-164.  DOI: 10.16638/j.cnki.1671-7988.2023.07.032 Abstract ( )   PDF (1693KB) ( )   In order to solve the low-voltage unenergized failure of BYD Qin hybrid, according to the circuit diagram and maintenance manual, analyze the low-voltage energized process, and summarize the diagnosis process of low-voltage unenergized fault. Finally, taking two real faults of 2019 Qin hybrid as examples, according to the diagnosis process, through two real vehicle troubleshooting cases, the feasibility of the diagnosis method is verified, which provides a certain reference for similar fault diagnosis. References | Related Articles | Metrics

Automobile Education

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Curriculum System Design of Automobile Intelligent Technology Specialty in Higher Vocational Colleges Based on 1+X Grade System HUANG Pengchao 2023, 48(7): 165-169.  DOI: 10.16638/j.cnki.1671-7988.2023.07.033 Abstract ( )   PDF (1272KB) ( )   Through the demand analysis of the professional ability of talents in the automotive intelligent technology industry chain, the major deeply analyzes the work field and typical work tasks of the industry, and the standard 1+X grade system. Exploration and practice in line with the regional auto intelligent industry demand by the professional personnel training mode, accurate positioning of talent training objective, course system to connect and professional skill level certificate system, innovation and practice of talent training, professional curriculum system, the teachers troop construction, the actual security conditions, such as the integration of the practice base construction, sustainable development to lay the good foundation for the professional health. It provides reference for the curriculum system design of automobile intelligent technology specialty in vocational colleges. References | Related Articles | Metrics

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Ideological and Political Teaching Practice of Higher Vocational Practical Training Courses under the Perspective of Craftsman Spirit —Take the Automotive Technical Service and Marketing Major as an Example DAI Linlin 2023, 48(7): 170-174.  DOI: 10.16638/j.cnki.1671-7988.2023.07.034 Abstract ( )   PDF (1104KB) ( )   The cultivation of the craftsman spirit is an important manifestation embodiment of the moral education in vocational education. The practical training classroom to carry the role of cultivating students' practical ability and innovative consciousness, and it is of great significance to integrate the craftsman spirit into the ideological and political teaching of the practical training courses. Based on the current situation of ideological and political teaching in the training courses of automobile technical service and marketing major, and on the basis of the teaching objectives of the training courses, the mode of "nine dimensions and three steps" is adopted to establish the ideological and political teaching method of higher vocational practical training courses under the perspective of craftsman spirit. By improving teachers' teaching ability, innovating teaching methods, constructing the curriculum education evaluation system, and integrating the craftsman spirit, labor spirit and model workers' spirit into the ideological and political teaching of practical training courses, the quality of vocational education personnel training can be improved. References | Related Articles | Metrics

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Research on the Talent Training Mode of New Apprenticeship and Modern Apprenticeship in Enterprises from the Perspective of Dual System LI Lei 2023, 48(7): 175-179.  DOI: 10.16638/j.cnki.1671-7988.2023.07.035 Abstract ( )   PDF (1140KB) ( )   Through the investigation and visit to many schools in Germany, this paper investigates and studies the German dual system education model, defines the connotation and essence of dual system education, compares the training model of domestic modern apprenticeship and enterprise new apprenticeship, summarizes the similarities and differences between domestic and foreign education models, draws lessons from the dual system model, learns the advantages of dual system education model, and launches the thinking on the construction of enterprise new apprenticeship and modern apprenticeship. Put forward several suggestions on the reform of vocational education teaching, such as the direction of reform and the reconstruction of the curriculum system and teaching content. References | Related Articles | Metrics

Standards Regulations Management

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Analysis on the Emission Status of In-use Vehicle Based on Annual Vehicle Inspection Date in Chongqing CHEN Xubo 2023, 48(7): 180-184.  DOI: 10.16638/j.cnki.1671-7988.2023.07.036 Abstract ( )   PDF (1726KB) ( )   Based on the annual inspection data of 82 540 in-use vehicles from 149 motor vehicle annual inspection stations in Chongqing, the data quality and passing rate of different annual inspection test methods were analyzed statistically. The results show that: 1) The average score of data quality of the annual inspection station is 89.3 points, and the data quality of the two-speed idle conditions method is significantly lower. It is suggested to further strengthen the normative requirements of two-speed idle conditions method.2) Among the annual inspection test methods of motor vehicles, the passing rate of the free acceleration method is the highest, followed by the steady-state condition method, and the two-speed idle conditions method and the lugdown cycle are the lowest, but both are higher than 90%. 3) The passing rate of the motor vehicle annual inspection station conforms to the normal distribution law.Too high or too low passing rate is not conducive to the screening of high-emission vehicles. It is suggested to further optimize the emission limits and detection methods to improve the screening efficiency. References | Related Articles | Metrics

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Automate Construction of the Data Structure for Transverse Agent Part ZHANG Guanhua 2023, 48(7): 185-189.  DOI: 10.16638/j.cnki.1671-7988.2023.07.037 Abstract ( )   PDF (1127KB) ( )   With the rapid development of the automobile industry, the complexity of transverse agent part that arises from business issues becomes higher and higher, and the accuracy of transverse agent is directly related to the smooth progress of a series of production and operation activities such as procurement, warehousing and settlement. An automate construction method of data structure for transverse agent part is studied in this paper. The basic definition, management of transverse agent part in engineering bill of material (EBOM) and construction of data structure construction in manufacturing bill of material (MBOM) are discussed in this paper. Finally, the benefits of this method to improve the quality of engineering release and reduce data error rate for building are concluded. References | Related Articles | Metrics

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Practice on Quality Management of Parts Development with Embedded Software LI Chunyang 2023, 48(7): 190-194.  DOI: 10.16638/j.cnki.1671-7988.2023.07.038 Abstract ( )   PDF (1942KB) ( )   With the rapid development of automobiles in the direction of intelligence and networking, embedded software occupies an increasingly important position, and the software and hardware complexity of intelligent parts have also increased geometrically, and their reliability and stability have an increasing impact on the quality of the whole vehicle. In order to continuously improve the level of quality management before new opportunities and challenges, and continuously provide consumers with higher value automotive products and services, the Beijing automotive quality department has explored and formulated the quality management method for parts development with embedded software by drawing on the mature management methods in the industry and the experience accumulation of many software and hardware experts, and established hardware review standards through circuit schematics, PCB layout, structure and other reviews. Establish the quality management specifications of the software advanced software quality planning (ASQP) and software produc approved process (SPAP) software development process, and apply them to implement them on new projects, which provides a useful reference for the subsequent improvement of software management. References | Related Articles | Metrics

Overview

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Analysis of Influencing Factors of Uncivilized Driving Habits in Northeast China Based on Cluster Analysis ZHANG Xinyu 2023, 48(7): 195-199.  DOI: 10.16638/j.cnki.1671-7988.2023.07.039 Abstract ( )   PDF (2447KB) ( )   The demand for private cars in Northeast China is rapid, and all kinds of uncivilized behaviors in the driving process increasingly affect traffic passage and traffic safety. In order to better understand the characteristics of drivers in Northeast China, this paper makes a questionnaire survey on drivers in Northeast China, and analyzes the causes and countermeasures of uncivilized behaviors. The results show that drivers in Northeast China are vulnerable to objective factors such as lane congestion, emotional factors affected by others' emotions and internal reasons for driving skills and proficiency. References | Related Articles | Metrics

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The Development Status and Trend of Key Technologies in the Field of Internet of Vehicles in China CHEN Jianhui 2023, 48(7): 200-204.  DOI: 10.16638/j.cnki.1671-7988.2023.07.040 Abstract ( )   PDF (1281KB) ( )   With the development of current intelligent, electric and connected vehicles, the development of Internet of vehicles plays a decisive role in the progress of intelligent and connected vehicle technology. Based on the analysis of the development status and trend of the Internet of vehicles at home and abroad, this paper briefly analyzes the development status of the Internet of vehicles in China from four aspects: communication technology, cloud control technology, highprecision positioning technology and information security, and summarizes the challenges faced by the Internet of vehicles in China from three aspects: security problems, production problems and business models. The analysis believes that the improvement of relevant policies and standards must be accelerated. Based on the current situation of the industry, accelerate the cultivation of core technologies, improve the industrial chain, and promote the healthy and orderly development of the Internet of vehicles. References | Related Articles | Metrics