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30 September 2021, Volume 46 Issue 18 Previous Issue   
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New Energy Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Use and Maintenance
Automobile Education
Standards Regulations Management
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New Energy Vehicle

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Research on Matching Design and Efficiency Optimization Control Strategy of Electric Logistics Vehicle LI Xuefan 2021, 46(18): 1-5.  DOI: 10.16638/j.cnki.1671-7988.2021.018.001 Abstract ( )   To improve the economy of the electric vehicle, a efficiency optimization optimal control strategy was developed. The efficiency optimization control strategy is to obtain the relationship among battery efficiency, charge-discharge power and SOC through multiple linear regression. The battery efficiency diagram is divided into several parts according to SOC interval, so that the design equation of efficiency curve can better adapt to the efficiency diagram. The forward simulation model of electric vehicle is established by Matlab/Simulink, and verified by cwtvc driving cycle. The experimental results show that, compared with the map based method, the actual efficiency points of the battery using the efficiency optimization control strategy are distributed in a higher efficiency range, and the driving range can reach 300 km, and the monthly running distance can be increased by 360 km. References | Related Articles | Metrics

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A Method and Device Design for Charging Pile Test Power Supply Based on Digital Adjustment Incremental Compensation LI Yinyin 2021, 46(18): 6-10.  DOI: 10.16638/j.cnki.1671-7988.2021.018.002 Abstract ( )   With the development of new energy vehicles, problems in the construction of upstream and downstream facilities and supporting infrastructure for electric vehicles have also attracted the attention of researchers. The current electric vehicle charging pile test equipment is expensive and inconvenient to operate. The device designed in this paper using the principle of digital adjustment incremental compensation effectively solves these problems. This paper uses a high-accuracy AD conversion circuit and a digital synchronous tracking amplifier to ensure the accurate and stable output of the power supply. When the maximum increment is ±15%, the actual output power of the switching power amplifier is only 15% of the full-scale power output, and the volume, weight and cost are less than 7% of the original equipment, which meets all current requirements. The test project provides a basis for the large-scale industrialization of related equipment. References | Related Articles | Metrics

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Research on Driving Performance of Pure Electric Vehicle CHEN Shuping 2021, 46(18): 11-14.  DOI: 10.16638/j.cnki.1671-7988.2021.018.003 Abstract ( )   Through the subjective evaluation of driving performance of several pure electric vehicle, the mathematical model and subjective evaluation system of driving performance of battery electric vehicle are established, and the starting acceleration performance is the highest. The driving performance of a pure electric vehicle is evaluated subjectively through the objective calibration test.The starting acceleration performance test data under SPORT /ECO /NORMAL driving modes are obtained, which provides data support for the subjective evaluation results of the pure electric vehicle, and also provides reference for the research on the driving performance of pure electric vehicle. References | Related Articles | Metrics

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Efficiency Analysis and Correction Method Research of Pure Electric Transmission LIU Bo 2021, 46(18): 15-17.  DOI: 10.16638/j.cnki.1671-7988.2021.018.004 Abstract ( )   Pure electric vehicles are the development direction that new energy is vigorously promoted. In order to pursue high efficiency and low energy consumption, it is very important to accurately analyze the efficiency of the transmission. This paper takes a pure electric transmission as an example to study the main influencing factors of gear power loss, and calculates the efficiency spectrum under different oil temperature, input torque and input speed. Two sample boxes are used to carry out the same efficiency test. Through simulation analysis results and comparison results of the two sample boxes, the efficiency has a small difference when the input torque is greater than 30 Nm. And to study the reasons for the difference of results less than 30 Nm, and to study the correction method of the simulation analysis results,which provides a reference for the simulation of the efficiency of other pure electric transmissions with similar structures. References | Related Articles | Metrics

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Research and Development of a Special Chassis for Fire Fighting of Pure Electric Light Truck Based on Satellite Fire Station YUAN Hongru 2021, 46(18): 18-20.  DOI: 10.16638/j.cnki.1671-7988.2021.018.005 Abstract ( )   Through the visits and investigations of fuel vehicle equipment and combat personnel of "satellite fire stations" in major city streets, commercial districts, and towns and towns, and combined with the suggestions of senior designers from many well-known domestic fire truck modification companies, the current market technology status is relatively mature. On the cargo and special-purpose new energy light truck chassis, comprehensive specificity, reliability, applicability, dynamics, modularity, lightweight and other performance indicators redefine the structure and layout of each system to meet the requirements of modern urban fire station fire prevention and rescue new energy fire fighting vehicle equipment. The successful R&D, promotion and application of new energy medium and light truck fire fighting special chassis has reserved a certain technological accumulation for the new energy fire fighting special chassis mainly for heavy trucks into the emergency rescue team. At the same time, it conforms to the global trend of electrification of commercial vehicles, saving energy and reducing emissions. References | Related Articles | Metrics

Design and Research

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Research on the Viewpoint Optimization Method of Structured Light Scanning System for Car Body Thin-plate Parts CHEN Yonghua 2021, 46(18): 21-26.  DOI: 10.16638/j.cnki.1671-7988.2021.018.006 Abstract ( )   3D optical inspection technology is widely used in the inspection and assembly process of auto parts, especially the inspection of complex parts. This paper proposes a linear structured light scanning pose optimization method based on the requirements of vehicle body measurement uncertainty, and establishes a multi-objective function with the constraints of minimizing the uncertainty of detection features and the minimum number of viewpoints. The improved greedy algorithm is used to optimize the selection of viewpoints. Finally, the optimal viewpoint detection order is determined with the goal of optimal detection time. Case comparison analysis shows that the multi-objective constrained sampling optimization strategy proposed in this paper effectively improves the detection accuracy of key features and ensures the reliability of detection quality. References | Related Articles | Metrics

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A Compensation Correction Driver Model YANG Hao 2021, 46(18): 27-29.  DOI: 10.16638/j.cnki.1671-7988.2021.018.007 Abstract ( )   The driver model plays an important role in the human-vehicle-road closed-loop system. In order to improve the accuracy and adaptability of the path tracking of the driver model, more scholars have established an intelligent decision-making steering wheel angle model based on intelligent control algorithms. The intelligent control of the driver model improves the path tracking accuracy to a certain extent, but when the vehicle is disturbed and loses stability, its path tracking effect is poor. Therefore, when the driver model is tracking the path, a compensation correction link should be established. When the tracking accuracy of the vehicle decreases, the compensation correction link is used to improve the tracking accuracy and driving stability of the vehicle. Based on the above analysis, this paper uses the 2-DOF vehicle model as the reference model, and uses steady-state steering as the ideal steering state to compensate and correct the steering wheel angle. A compensation correction driver model is proposed to improve the path tracking accuracy and adaptability of the driver model. References | Related Articles | Metrics

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Design of Automobile Hydraulic Differential GAO Jingxue 2021, 46(18): 30-33.  DOI: 10.16638/j.cnki.1671-7988.2021.018.008 Abstract ( )   The hydraulic differential designed in this project is based on the hydraulic torque converter, and it is planned to realize the differential automatic differential and anti-skid by hydraulic transmission, so as to ensure the normal driving of the vehicle in various working conditions. In the structure, the driven bevel gear plate of the main reducer is the pump wheel, and the half shaft gears on both sides of the traditional differential are the turbines. The middle pump wheel drives the turbines on both sides to make the wheels rotate, and cancels the rigid connection of the wheels, so the movement process is independent. Realize automatic differential and anti-skid, improve the service life of main reducer and differential, and realize stepless speed change. According to the vehicle power transmission and performance requirements, the specific speed, circulation flow, circulation circle diameter and other parameters of the hydraulic differential are calculated. References | Related Articles | Metrics

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Heavy Truck Powerplant Mounting System Technology Research DONG Jiajia 2021, 46(18): 34-38.  DOI: 10.16638/j.cnki.1671-7988.2021.018.009 Abstract ( )   This thesis researches heavy truck powerplant mounting system technology from mount layout, material, internal structure and performance. In mount structure, this paper list the road map of technology evolution, and analysis its advantages and disadvantages of each generation. In mount performance, give a third generation mount stiffness test example. At last, compare the mount lateral stiffness effect on rigid mode and decouple rate. References | Related Articles | Metrics

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Analysis and Improvement on Local Cracking of Bus Body Frame WU Changfeng 2021, 46(18): 36-42.  DOI: 10.16638/j.cnki.1671-7988.2021.018.010 Abstract ( )   In view of the fatigue cracking problem of a bus body frame, through the CAE strength analysis of the bus body under typical working conditions, the stress concentration position is consistent with the cracking position. Mainly concentrated in the front suspension and the cross beam under the tail section safety door. For the weak parts, the methods of local strengthening and rear section stiffness improvement are adopted. The results show that the structural stress of the relevant area is controlled within the fatigue limit, and the durability of the local structure of the bus is improved. References | Related Articles | Metrics

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The Method of Alignment Parameters Simulation and Critical Dimension Identification of Double Wishbone Air Suspension Based on 3DCS RAN Xiongtao 2021, 46(18): 43-46.  DOI: 10.16638/j.cnki.1671-7988.2021.018.011 Abstract ( )   The influence of four-wheel alignment parameters to the performance of the chassis is very important. The angle of the parameters is affected by the deviation of the manufacturing process, so the dimension engineering needs to check the angle deviation in the design stage. The angle tolerance of positioning parameters calculated by 2D dimension chain is more complex and the accuracy is low. By using 3DCS software, the positioning parameters of the double wishbone air suspension system are simulated and analyzed, and the critical dimension list is identified and established. References | Related Articles | Metrics

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Design and Validation of All-aluminum Frame for Light Truck CHEN Lin 2021, 46(18): 47-50.  DOI: 10.16638/j.cnki.1671-7988.2021.018.012 Abstract ( )   In this paper, an equal-width straight all-aluminum frame is designed for light truck. The frame is made of 7-series aluminum alloy 7050 with high yield strength and high stress corrosion fracture resistance, and advanced thick plate manufacturing technology. One-time extrusion molding can effectively improve the mechanical performance of the frame system. The development process is based on the virtual verification of the frame strength, modal and fatigue based on the finite element analysis software Hypermesh, and then the torsional fatigue of the frame is verified through the focus of the bench test. The test shows that the performance of the frame system meets the design and Requirements. At the same time, the weight can be reduced by 35%-45% compared to the all-aluminum frame of the same type of steel frame. References | Related Articles | Metrics

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A Brief Discussion on the Design Method of Vehicle Electrical System Based on Capital YANG Shu 2021, 46(18): 51-55.  DOI: 10.16638/j.cnki.1671-7988.2021.018.013 Abstract ( )   To meet the challenge to design and manufacture of complex wiring harness and growing customization requirements, proposed a hybrid design mode using modular method for complex harness and composite method for simple harness. This design mode can utilize Capital’s automatic wiring generation method to generate correct diagrams while using the respective advantages of the two design modes. It meets the increasing customization requirements while maintaining the flexibility of the wiring design method and improves the development efficiency and reliability of the vehicle wiring harness. References | Related Articles | Metrics

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Application Research on Influence of Accumulator in Automatic Transmission Hydraulic Control System WEN Huaming 2021, 46(18): 56-59.  DOI: 10.16638/j.cnki.1671-7988.2021.018.014 Abstract ( )   Accumulator is mostly used in the automatic transmission hydraulic system to absorb the pressure shock in the oil circle and making the pressure more steady. The stable pressure could improve the torque control accuracy of the vehicle and make the vehicle have better driving ability. Through the research of the parameters of accumulator, the influence of relevant factors is confirmed, and the key application methods of the accumulator are summarized.It could provides some reference for the further research. References | Related Articles | Metrics

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Analysis of Steering Torque Fluctuation Based on Steering Angle Variation PI Qiusheng 2021, 46(18): 60-62.  DOI: 10.16638/j.cnki.1671-7988.2021.018.015 Abstract ( )   At the present stage, the common steering transmission way is cross shaft, due to the space constraints of steering column and steering intermediate, constant speed transmission is difficult to guarantee. Based on the theory of cross axle motion, this paper analyzes the layout of the steering system which affects the steering torque fluctuation, discusses the calculation method of analyzing the steering torque fluctuation based on the change of steering angle, and verifies the effectiveness of the calculation method through a passenger car. References | Related Articles | Metrics

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The Design of Diagnostic Connector Fixed Structure MENG Lin 2021, 46(18): 63-66.  DOI: 10.16638/j.cnki.1671-7988.2021.018.016 Abstract ( )   Automotive diagnostic interface plug-in is a necessary plug-in in automotive wiring harness, that is, different brands of diagnostic interface plug-in have the same model, but due to the different vehicle structure of different models, the location of diagnostic interface on the vehicle is different. This paper studies the fixed structure form of automobile diagnosis interface. By using the fixed structure form of diagnosis interface designed on the electrical box body, the fixed position of diagnosis interface plug-in can be standardized and unified while the diagnosis interface plug-in can be fixed reliably. References | Related Articles | Metrics

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Discussion on Several Problems of Light Truck Frame Development YU Jibang 2021, 46(18): 67-70.  DOI: 10.16638/j.cnki.1671-7988.2021.018.017 Abstract ( )   In this paper, theoretical calculation and finite element method are used to analyze and summarize the problems encountered in the development of the frame, such as the calculation of the moment of inertia of the longitudinal beam section, the influence of the cargo box on the stiffness of the frame and the influence of the cab turning torque on the deformation of the frame, which has a certain guiding significance for the development and improvement of the light truck frame. References | Related Articles | Metrics

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Design and Simulation Analysis of a Bracket with High-power Converter for Fuel Cell System ZHOU Mengting 2021, 46(18): 71-73.  DOI: 10.16638/j.cnki.1671-7988.2021.018.018 Abstract ( )   In this paper, a bracket with chip structure fixed on the chassis of a fuel cell passenger car is designed, which can carry high-power and high-pressure components of the fuel cell system. Combined with HyperWorks and n Code Design Life, the static strength and fatigue simulation analysis of the bracket are carried out, by optimizing the structure, material and thickness of the support, the strength and life of the support can be improved. And through the durability and reliability test of the whole vehicle and the bench, the sample has been fully verified, avoiding the risk of fracture, deformation and fatigue failure due to deficiencies in design, manufacturing and practical application. References | Related Articles | Metrics

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Performance Analysis and Optimization of High Level Intake Tube on Heavy Duty Truck HOU Eming 2021, 46(18): 74-76.  DOI: 10.16638/j.cnki.1671-7988.2021.018.019 Abstract ( )   Three-dimensional configuration and analysis caculation of a new designed swirl high level instake tube on heavy duty truck are carried out in this paper. Influence on intake resistance, prefiltration efficiency and water separation efficiency of three swirl tube structure are analysised based on K-? terbulence model. The optimal design scheme can guide design process and provide theoretical support for bench performance test later. References | Related Articles | Metrics

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Removable Structure Applied in the Design of Electrical Box SUN Fengchao 2021, 46(18): 77-79.  DOI: 10.16638/j.cnki.1671-7988.2021.018.020 Abstract ( )   The electrical box is the key component of the automotive wiring harness. This paper studies the application of detachable structure in the design of electrical box, and shows a new form of electrical box structure design. In this paper, by providing a specific fixed terminal detachable structure, it is proved that it can improve the safety, reliability and maintenance convenience of the electrical box. References | Related Articles | Metrics

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Analysis and Optimization of the Opening and Closing Process of a Vehicle Revolving Door ZHANG Lintao 2021, 46(18): 80-82.  DOI: 10.16638/j.cnki.1671-7988.2021.018.021 Abstract ( )   In order to ensure the convenience of getting on and off, some vehicles use rotary doors. Most rotary doors adopt constant speed telescopic cylinder to drive the door to open and close. This structure can not avoid the uneven movement during the door opening and closing process, which leads to the difficulty in adjusting the door movement speed, large movement impact and poor use feeling. This paper analyzes the opening and closing process of the revolving door of a certain vehicle by means of motion process simulation and chart analysis, and optimizes the structure of the door, so as to reduce the motion impact and get a better use feeling. Through the structural optimization, the maximum angular acceleration of the revolving door of the car is reduced by 98%, the door opening and closing process is smooth, and the use experience is good. References | Related Articles | Metrics

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Research and Design Method of Lightweight for Commercial Vehicle Axles YANG Sheng 2021, 46(18): 83-85.  DOI: 10.16638/j.cnki.1671-7988.2021.018.022 Abstract ( )   The lightweight design of commercial vehicle axle is a continuous weight reduction based on the actual operation condition of vehicle and the guarantee of product reliability and performance. Under the total mass remains unchanged, the net transportation income brought by the reduction of vehicle weight is very considerable. Combined with the domestic and foreign axle lightweight engineering practice, this paper refines the lightweight design method of drive axle suitable for commercial vehicles, and provides reference for the lightweight development of commercial vehicle parts. References | Related Articles | Metrics

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Analysis of the Method of Calculating Static Current Parameter of Vehicle YU Shiyun 2021, 46(18): 86-88.  DOI: 10.16638/j.cnki.1671-7988.2021.018.023 Abstract ( )   n order to solve the problem that the static current parameters of vehicle with grading dormancy function cannot be correctly calculated, this article provide a method of calculating static current parameter of vehicle, by means of detecting the voltage of standing vehicle battery regularly, via SOC-V characteristic curve of the battery, calculate static current parameter of vehicle correctly, provide reference for battery selection. At the same tine, the data is used to verify the effectiveness of the grading dormancy strategy. Related Articles | Metrics

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Analysis of the Looseness Problem of a Passenger Car CEPS Column Bracket WANG Hao 2021, 46(18): 89-91.  DOI: 10.16638/j.cnki.1671-7988.2021.018.024 Abstract ( )   In view of the loosening of the bolt connecting the support on the pipe string of a passenger car tubular electric power steering (hereinafter referred to as CEPS), the causes of bolt loosening were determined through CAE analysis, bench test and benchbenchcomparison, and a feasible optimization scheme was formulated and implemented. Through the analysis, optimization and implementation of the loosening problem of connection bolts, the matching design capability of CEPS and instrument panel pipe beam (hereinafter referred to as CCB) is improved. References | Related Articles | Metrics

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Research on the Output Interface Circuit Design of the Vehicle Body Controller LI Yue 2021, 46(18): 92-94.  DOI: 10.16638/j.cnki.1671-7988.2021.018.025 Abstract ( )   This article mainly combines the electric principle of the vehicle and the types of the external load of the body controller. The output circuit of the body controller is analyzed from four aspects: external relay drive control, high-side drive control, built-in relay control and LED indicator control. In the initial stage of the design, select and arrange the output drive components of the body controller to meet the functional requirements of the vehicle according to the type and quantity of external loads. References | Related Articles | Metrics

Testing and Experiment

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Correlation Analysis of Deteriorating Performance Parameters of Particulate Filter GUO Ruirui 2021, 46(18): 95-97.  DOI: 10.16638/j.cnki.1671-7988.2021.018.026 Abstract ( )   This article first explains the reasons for the deterioration of the particulate trap, and then qualitatively analyzes and summarizes the main influencing factors of active regeneration. On this basis, the gray correlation model is used to determine the influence of several influencing factors on the regeneration efficiency. The influence degree is sorted, which can provide a certain reference basis for the optimization of the regeneration performance of the particulate trap. References | Related Articles | Metrics

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Research on Vibration Characteristics of Drive Shaft System of Four-wheel Drive Commercial Vehicle Based on ADAMS LIU Zimeng 2021, 46(18): 98-99.  DOI: 10.16638/j.cnki.1671-7988.2021.018.027 Abstract ( )   By using ADAMS and Simulink software platform, the dynamic simulation analysis of four-wheel-drive commercial vehicle drive shaft system is realized, the simulation model of two-degree-of-freedom vehicle vibration and random uneven road surface under B-grade road surface is established, and the dynamic deflection of suspension is calculated. The influence of the vibration of the transmission shaft system with and without suspension deflection is compared, the vibration of the transmission shaft system is analyzed respectively when the actuator is in the high and low position, and the maximum vibration position is obtained. References | Related Articles | Metrics

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Stability Analysis of Hood and Prop Rod Based on Pseudo Contact Method ZHENG Jun 2021, 46(18): 100-103.  DOI: 10.16638/j.cnki.1671-7988.2021.018.028 Abstract ( )   Based on the test method, the stability analysis of hood prop rod in the design verification stage has been carried out.Combined with the experimental data, the pseudo-contact method has been applied to study whether the hood can meet the requirements of fine craftsmanship and structural strength. Numerical analysis results show that the buckling force of the rod don’t reach the first-order critical instability state, and the stiffness and strength of the model meet the requirements of fine craftsmanship and structural strength correspondingly. Matching with prop rod and body provide the basement for the next stage of development. References | Related Articles | Metrics

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Research on Prediction of Car Interior Wind Noise Based on FEM ZOU Rui 2021, 46(18): 104-108.  DOI: 10.16638/j.cnki.1671-7988.2021.018.029 Abstract ( )   Effectively predict wind noise in high-speed vehicles, and provide a convenient way to solve the problem of wind noise in vehicles. The method of combining computational fluid dynamics (CFD) and finite element acoustics (FEM) is used to simulate the wind noise in high-speed cars, based on an existing model , use the modal-based acoustic-vibration coupled response analysis method to calculate the sound pressure level at the driver's left ear, compare the road test results, and study the feasibility and effectiveness of this simulation method. The unidirectional spring element is used to restrain the side window glass, and the influence of different stiffness coefficient k on the glass structure mode and simulation results is analyzed, and a more effective value of k is found to improve the simulation accuracy. References | Related Articles | Metrics

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Influence of Pretreatment Procedure on Test Results of Evaporative Pollutant Emission Test YANG Baoniu 2021, 46(18): 109-111.  DOI: 10.16638/j.cnki.1671-7988.2021.018.030 Abstract ( )   According to the research, hydrocarbon volatilization from non fuel systems such as tires, seats and interiors becomes an important part of vehicle evaporative pollutant limit. In order to explore the influence of high-temperature soaking time designed in the evaporative pollutant emission test program, as well as the pre-treatment program allowing specified temperature and specified time baking on the evaporative pollutant emission test.In order to study the influence of pretreatment procedure on evaporative pollutant test, the comparative analysis method of sample vehicle evaporation test after different pretreatment procedures, such as baking, high temperature immersion in different time, was adopted. References | Related Articles | Metrics

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Research on the Occupant Chest Injury of Dynamic Lock Tongue in Vehicle Front Impact JIANG Jian 2021, 46(18): 112-115.  DOI: 10.16638/j.cnki.1671-7988.2021.018.031 Abstract ( )   The usage of the seatbelt as a part of the vehicle protection system has immensely promoted occupant safety. However, recent accident investigation shows that it is necessary to increase the chest injury protective efficiency in frontal impact condition. The study is conducted by using baseline human body FE model in combination with frontal impact test. An occupant restraint system model of Dynamic Lock Tongue (DLT) seatbelt is established and verified by vehicle experiments. The study aims to the influence of DLT on occupant chest injury. The results show that DLT can block the movement of the webbing from the chest to the hips, and reduce the dummy chest displacement, thus effectively reducing the pressure on the chest of the occupant and the amount of occupant chest compression. DLT effectively reducing the amount of occupant chest compression, which affects the C-NCAP score. Therefore, DLT should be fully considered and applied for developing the high safe performance of vehicles in the design stage. References | Related Articles | Metrics

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Analysis and Improvement Measures of High Oil Temperature in Hydraulic Power Steering System of Heavy Commercial Vehicles ZHANG Ruifeng 2021, 46(18): 116-118.  DOI: 10.16638/j.cnki.1671-7988.2021.018.032 Abstract ( )   As a key and security system for heavy commercial vehicles, hydraulic power steering system must be given sufficient attention during the development and testing phases. Excessive oil temperature and oil pressure of the hydraulic power steering system will cause irreversible damage to the key components of the system, and even lead to serious consequences. In order to study the extreme performance of the hydraulic power steering system of heavy commercial vehicles, the hydraulic steering system oil pressure and oil temperature changes were collected in a typical vehicle test around the "8". Through design matching and verification, the reasons for the high temperature are summarized and analyzed and corresponding improvement measures are proposed. It has certain guiding significance for the failure analysis and development and design of the steering hydraulic system. As a key and security system for heavy commercial vehicles, hydraulic power steering system must be given sufficient attention during the development and testing phases. References | Related Articles | Metrics

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Noise Performance Optimization of a Resonator MA Jingjing 2021, 46(18): 119-121.  DOI: 10.16638/j.cnki.1671-7988.2021.018.033 Abstract ( )   The noise performance of the intake system becomes a key technical index. The resonant cavity structure can optimize the acoustic performance of the intake system of passenger cars. By dividing the cavity and adding muffler holes on the main road, the amplitude of muffler and frequency band of the cavity can be improved, and the structure optimization and muffler effect of the cavity can be analyzed to achieve the purpose of optimizing the noise performance of the intake system and improve the satisfaction of the noise sense of passenger car customers. References | Related Articles | Metrics

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Lightweight Single-layer Beam Frame Design Applied to Heavy Trucks ZHU Weina 2021, 46(18): 122-124.  DOI: 10.16638/j.cnki.1671-7988.2021.018.034 Abstract ( )   In order to improve the efficiency of single trip transportation, there is an urgent need for tractors to be lightweight. The frame occupies a large proportion of the dead weight of the whole vehicle, so there is still room for optimization of the frame in order to achieve full vehicle lightweight. In this paper, the frame structure is optimized based on the existing frame structure of the market model, and the stiffening plate inside the frame is cancelled on the basis of satisfying its load bearing and reliability. Though the finite element analysis software HyperWorks, the strength changes of the two frame under different working conditions before and after optimization were compared and analyzed. On the premise of satisfying the simulation safety factor, the reliability test of the whole vehicle was carried out. The structure of the frame fully meets the working conditions of the corresponding market segments, and it has the value of promotion. References | Related Articles | Metrics

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Concentration Characteristic Analysis of Volatile Organic Compounds in New Vehicles at Different Detection Temperature ZHU Zhenyu 2021, 46(18): 125-127.  DOI: 10.16638/j.cnki.1671-7988.2021.018.035 Abstract ( )   According to the standards HJ/T 400—2007 and ISO 12219—1—2012, VOCs in new vehicles on the market at room temperature and high temperature were tested, and the characteristics of VOCs concentration at different detection temperatures were studied. The research results showed: (1) The concentration of benzene, toluene, ethylbenzene, xylene, styrene, formaldehyde, and acrolein in 22 new vehicles were far below the limits in GB/T 27630—2011. However, the over-standard rate of acetaldehyde reached 40.9%, and the maximum concentration was 0.103 mg/m3 , which was 2.06 times of the standard limit. (2)The concentration of VOCs in new vehicles at high temperature was significantly higher than that at room temperature. Regardless of room temperature or high temperature, the concentration of formaldehyde and benzene were significantly higher than that of other VOCs. (3)The concentration of toluene, ethylbenzene, xylene, styrene, formaldehyde, and acetaldehyde at room temperature all showed linear relationships with their corresponding concentration at high temperature. References | Related Articles | Metrics

Process and Equipment

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Common Causes and Solutions for Rapid Pressure Rise of LNG Cylinders for Vehicles MENG Xinjun 2021, 46(18): 126-132.  DOI: 10.16638/j.cnki.1671-7988.2021.018.036 Abstract ( )   A theoretical analysis of the factors that cause rapid pressure rise of automotive LNG cylinders is carried out. This article focuses on the analysis of the influence of the number of winding layers of thermal insulation materials, the type of getter, and the vacuum process on the pressure-boosting fast cylinders during the manufacturing process of the enterprise, mechanism. It also analyzes and verifies the corresponding solution measures for each influencing factor, which can provide systematic processing methods and ideas for solving the problem of rapid pressure rise of LNG cylinders for vehicles. References | Related Articles | Metrics

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Deformation Analysis of Rear Bumper Fascia under Complex Conditions FANG Minjing 2021, 46(18): 133-136.  DOI: 10.16638/j.cnki.1671-7988.2021.018.037 Abstract ( )   Deformable parts are widely used in automobile interior and exterior trims. If this type of part is treated as rigid body in virtual assessment, the difference from the result of actual installation is significant. By using the finite element simulation method, this type of part can be analyzed in early stage of process planning for optimizing product structure and process. In this essay, the installation analysis of rear bumper fascia under complex conditions is taken as a case to verify the feasibility of applying the finite element simulation method. Related Articles | Metrics

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Analysis on Calculation and Check of Torque of Threaded Fastene WEI Xiaohua 2021, 46(18): 137-140.  DOI: 10.16638/j.cnki.1671-7988.2021.018.038 Abstract ( )   In automobile assembly, the assembly quality of threaded fasteners will directly affect the assembly quality and driving reliability of the whole vehicle, so the calculation and check of its torque is very important. This paper discusses the calculation method and theory of clamping force and torque, combined with different tightening scenarios, this paper puts forward the torque calculation method and verification are proposed, which can be used for the anti loosing design of new products and the anti loosing check of known threaded fasteners, so as to effectively improve the design efficiency and ensure the tightening quality of products. References | Related Articles | Metrics

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Design of Repairing Process for Kawasaki BZ740 Oil Pump GAO Zhongwei 2021, 46(18): 141-143.  DOI: 10.16638/j.cnki.1671-7988.2021.018.039 Abstract ( )   Since most oil compressors adopt imported oil pumps, the spare parts procurement cycle is long, and the maintenance is difficult.This paper is aimed at the wear failure of the rolling key of the BZ740 imported oil pump spindle of Kawasaki press in Japan, analyzes and studies the repair scheme for the damage of the oil pump spindle, designs the whole boring process for the on-site repair of the pump shaft without disassembly, and explores a new method of independent repair for the similar failure of this kind of imported oil pump. References | Related Articles | Metrics

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Research on the Principle of Anti-loosening of Wheel Nuts with Washers CHEN Yongping 2021, 46(18): 144-146.  DOI: 10.16638/j.cnki.1671-7988.2021.018.040 Abstract ( )   From the perspective of theoretical analysis, this paper not only analyzes the structure of the wheel nut with gasket, but also analyzes the force according to its installation state on the vehicle. It is analyzed in detail by mechanical theory, mechanical theory and physical theory to explore the anti-loose principle of the wheel nut with gasket. References | Related Articles | Metrics

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Improvement Method of Window Frame Electrophoresis Shrinkage XIAO Yuyuan 2021, 46(18): 147-149.  DOI: 10.16638/j.cnki.1671-7988.2021.018.041 Abstract ( )   This paper studies the electrophoretic shrinkage of the window frame, analyzes the causes of the shrinkage from the structure and process of the window frame, and verifies that the anti rust oil in the crack of the window frame is the direct cause of the shrinkage. By optimizing the rolling crack, compressed air to clean up the liquid in the gap, and replacing the better compatible antirust oil, the poor shrinkage can be controlled. Finally, the innovative scheme of introducing water-based antirust agent can solve the problem of electrophoretic shrinkage of window frame. References | Related Articles | Metrics

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Laser Tracking Measurement Technology and Its Application in Vehicle Manufacturing YANG Fusi 2021, 46(18): 150-152.  DOI: 10.16638/j.cnki.1671-7988.2021.018.042 Abstract ( )   This paper analyzes the principle, composition and working process of laser tracking measurement technology; summarizes the characteristics of "high precision, long distance, no connection" of this measurement technology; and points out the advantages of this measurement technology in large space precision measurement. Combined with practical work experience, this paper expounds how the measurement technology is applied to the field of vehicle manufacturing, and solves the problems of welding fixture process adjustment and body product precision monitoring in the process of vehicle manufacturing. Through the analysis and discussion of specific examples, it can provide valuable references for related technology research. References | Related Articles | Metrics

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Improvement of Process Scheme for Wire Harness Bracket of Axle Housing ZHANG Chaochao 2021, 46(18): 153-155.  DOI: 10.16638/j.cnki.1671-7988.2021.018.043 Abstract ( )   Because the shell material of a heavy truck axle is ductile iron, the welding process can not be used for the assembly and welding of the wire harness bracket parts. The bonding process scheme was adopted in advance to bond the wire harness bracket parts on the shell. However, the feedback of quality problems caused by the process of processing, transshipment and after-sales occurred constantly. Since the confirmation of the bonding scheme, there were 4 after-sales customer quality feedbacks in one year. The problem was a repeated problem, which caused serious complaints from customers and required urgent improvement of the technical scheme. In order to solve the problem of after-sales falling off, our team tried to improve the riveting process through experimental planning, redesigned the riveting bracket, reasonably selected the bracket material, calculated the stress, calculated the cost of bonding and riveting, realized the improvement of the process plan, and solved the after-sales problem. References | Related Articles | Metrics

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An Improved Scheme for the Frequent Damage of the Drill Bit in the Installation Hole of the Oil Cooling Nozzle in the Cylinder Block LU Wenzhang 2021, 46(18): 156-159.  DOI: 10.16638/j.cnki.1671-7988.2021.018.044 Abstract ( )   Engine cylinder homemade parts to our company in the oil cooling nozzle hole processing bit wreck a summary and analysis on the problems frequently, from a device on the spindle, cutting fluid supply pressure, to the process of design and cutting parameter, cutting tool Angle and hardness of the material blank analysis and find out the main reason for the bit wreck, by improving tool design and optimization of nc programming method, cylinder head was successfully solved in the oil cooling nozzle hole processing bit frequent wreck a problem; References | Related Articles | Metrics

Use and Maintenance

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Research on Automobile Diagnosis Strategy LIU Cong 2021, 46(18): 160-162.  DOI: 10.16638/j.cnki.1671-7988.2021.018.045 Abstract ( )   The increase in the complexity of automotive electronic and electrical functions requires a more comprehensive and accurate automotive diagnosis strategy. This article summarizes the functions and elements of the definition of automotive diagnosis strategy, and summarizes the principles and development procedures to be followed in the definition of automotive diagnosis strategy with examples. Considering the above factors in the design and development, it is possible to avoid problems such as non-reporting of faults and false-reporting of faults due to unreasonable definition of the diagnosis strategy. References | Related Articles | Metrics

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Bearing Fault Diagnosis Based on MLP Network ZHANG Ming 2021, 46(18): 163-166.  DOI: 10.16638/j.cnki.1671-7988.2021.018.046 Abstract ( )   Automotive diagnostic equipment be able to detect faults automatically and use artificial intelligence technology. Machine learning enables the computer to learn useful knowledge from external input data to adjust the algorithm structure to improve the reliability of fault diagnosis. The improved extreme point symmetric mode decomposition method is used to extract the initial intrinsic mode function, then import it into multi-layer perceptron network for training to establish a failure mode classification system in this paper. References | Related Articles | Metrics

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Automobile CAN Bus System Technology and Fault Diagnosis CAO Haiyan 2021, 46(18): 167-169.  DOI: 10.16638/j.cnki.1671-7988.2021.018.047 Abstract ( )   With the continuous development of automobile technology, the application of automobile electronic control system has become more and more extensive, and the reliability of information transmission between electronic control components has become particularly important, which brings a certain test to automobile maintenance personnel. This paper analyzes the structure and characteristics of the automobile CAN bus system, analyzes the failure cases of the CAN bus system, and summarizes the diagnostic steps, hoping to provide some reference and help to the automobile maintenance practitioners. References | Related Articles | Metrics

Automobile Education

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Teaching Design and Reflection of Seiko Craftsman to Ensure Wheel Safety ZENG Fanling 2021, 46(18): 170-173.  DOI: 10.16638/j.cnki.1671-7988.2021.018.048 Abstract ( )   In the context of epidemic prevention in 2020, in response to the call to postpone the study, online teaching is adopted for automobile repair professional courses. Aiming at the highly practical course of Automobile Maintenance, the teaching team fully investigated the learning situation, combined with the characteristics of online teaching, the existing teaching resources and the reception of school enterprise cooperation units, reconstructed the teaching content of the course, in order to adapt to the training requirements of seiko craftsman under the background of epidemic situation. The "three steps and four strategies" mode is adopted in the teaching implementation, and the feedback of teaching effect is good. This experience can be extended to the teaching of auto repair enrollment expansion professional courses. References | Related Articles | Metrics

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Teaching and Research Practice of Numerical Modeling for Thermal Management of Microchannel Structure CHEN Yong 2021, 46(18): 174-176.  DOI: 10.16638/j.cnki.1671-7988.2021.018.049 Abstract ( )   CFD software was introduced into the practical teaching and research for students, numerical modelling of the microchannel structure for thermal management was carried out by students through an example, and the heat transferring process and temperature distributing was studied. It can not only make students intuitively understand the heat transfer and temperature distribution of the battery pack, but also improve students' innovation and practical ability, improve teaching quality and stimulate students' interest in scientific research. References | Related Articles | Metrics

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Exploration and Practice of Interactive Online Teaching Mode Based on Intelligent Cloud Vocational Education Platform LEI Yingdong 2021, 46(18): 177-179.  DOI: 10.16638/j.cnki.1671-7988.2021.018.050 Abstract ( )   COVID-19 disrupts the normal teaching order. In response to the call of the Ministry of Education to "suspend classes without stopping teaching, and without stopping school". Giving play to the advantages of "Internet plus education". This article builds online teaching and learning environment based on Intelligent Cloud Vocational Education and WeChat Official Accounts Platform. Combined with the characteristics of the course and the actual situation, the course is carefully designed and online teaching activities are actively carried out. In this paper, the mechanism of "hardware and software support, multi-platform integration, interactive teaching, process feedback" was constructed to create an interactive online teaching model based on Intelligent Cloud Vocational Education, so as to ensure the teaching progress and quality during the epidemic. The practice has shown that the construction and application of teaching resource database and interactive online teaching based on Intelligent Cloud Vocational Education can enhance students' participation and improve the teaching effect. References | Related Articles | Metrics

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Practical Research on the New Teaching Mode of School Enterprise Cooperation "Orientation Class" YU Jianhua 2021, 46(18): 180-182.  DOI: 10.16638/j.cnki.1671-7988.2021.018.051 Abstract ( )   This paper mainly focuses on the new "Orientation Class" teaching mode of cooperation between Shanxi Vocational and Technical College of Mechatronics and Geely Automobile talent training. It not only focuses on the integration of production and education between our institute and enterprises, the joint development of education mechanism, talent training program, curriculum system and other aspects of research work, but also carries out practice in the aspects of teacher training, such as mutual employment and mutual education, technical services, Co Construction of training sites and so on. At present, this new mode of production, learning and research cooperation is another school enterprise cooperation mode in the new environment, and it is also a new direction and new measure for automobile majors to explore students' internship and employment, which has great research significance. References | Related Articles | Metrics

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Research on the Implementation Strategy of Ideological and Political Teaching Reform of Engineering Courses in Colleges and Universities SHANG Yi 2021, 46(18): 183-185.  DOI: 10.16638/j.cnki.1671-7988.2021.018.052 Abstract ( )   It is the fundamental task of education, especially in Colleges and universities. Colleges and universities should focus on improving students sense of social responsibility, innovative spirit and practical ability, comprehensively promote the practice of curriculum ideological and political, and excavate the ideological and political elements contained in professional courses, so as to give full play to the educational functions of various courses and the educational responsibilities of teachers. This paper takes the ideological and political education of engineering courses in Colleges and universities as the research object, focuses on the implementation strategy of Ideological and political education reform, and tries to explore a direction of Ideological and political education reform of engineeringcourses. References | Related Articles | Metrics

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Exploration and Effect of Cultivating High Skilled Top Students in Colleges and Universities Based on School Enterprise Integration — Take the Automobile Major of Wuxi Vocational and Technical College as an Example LIU Zhicai 2021, 46(18): 186-189.  DOI: 10.16638/j.cnki.1671-7988.2021.018.053 Abstract ( )   In view of the existing problems in the process of cultivating high skilled top-notch students by school enterprise cooperation, combined with the theoretical level of students, the growth characteristics of professional talents and the needs of the industry, under the guidance of the concept of school enterprise cooperation education, through the reserve of human resources and enterprise resources, talent training program tailored the practice and exploration of a series of initiatives, such as tutorial system plus personalized training and recommending enterprise R&D internship, have improved the school enterprise cooperation closeness and the practical ability, development potential and employment competitiveness of high skilled top students, and achieved good results. References | Related Articles | Metrics

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Discussion on Practical Teaching Mode of NC Programming and Machining Based on PBL LIU Fangfang 2021, 46(18): 190-192.  DOI: 10.16638/j.cnki.1671-7988.2021.018.054 Abstract ( )   CNC programming and machining of comprehensive practice curriculum focuses on training students' ability to complete the project. Based on the characteristics of PBL teaching mode and the course itself, this paper expounds the process and significance of project practice based on PBL teaching mode according to the three teaching practice links of "theory virtual reality", and clarifies the assessment standard. The exploration show that based on PBL teaching mode of CNC programming and machining practice training curriculum is feasible and effective. This paper has practical significance for the teaching method and reform of practice course of numerical control technology. References | Related Articles | Metrics

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Discussion on Automobile Construction Teaching Based on OBE WANG Shufang 2021, 46(18): 193-195.  DOI: 10.16638/j.cnki.1671-7988.2021.018.055 Abstract ( )   The course Automobile Structure is an important basic course for the specialty of automobile service engineering. Based on the concept of OBE and combined with the current teaching status of the course Automobile Construction, this paper proposes the timely adjustment of teaching content and integration of course resources, the establishment of a student-centered teaching method, the improvement of online teaching APP, innovation and entrepreneurship and course ideology and politics into the teaching content to carry out the teaching design. The course examination should pay attention to the process examination, aiming to mobilize the students' initiative, enthusiasm and creativity in learning, and improve the teaching effect of this course. References | Related Articles | Metrics

Standards Regulations Management

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A Certain Car Chassis Tuning and Subjective Evaluation YANG Fei 2021, 46(18): 196-199.  DOI: 10.16638/j.cnki.1671-7988.2021.018.056 Abstract ( )   The methods of chassis tuning and subjective evaluation are different for each company. This article uses a car as an example to introduce a set of methods for chassis tuning based on subjective evaluation, enumerating in detail the parts and their parameters that need to be adjusted, and The products before and after adjustment were subjectively evaluated, various indicators were scored and spider diagrams were drawn to verify the effectiveness of adjustment, which can provide references for actual engineering problems. References | Related Articles | Metrics

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Research on the Trend of Standard Regulations for Commercial Vehicles LIU Wensi 2021, 46(18): 200-203.  DOI: 10.16638/j.cnki.1671-7988.2021.018.057 Abstract ( )   utomotive industry standards and regulations as the industry's development of normative documents. To the enterprise to do products played a guiding role, but also affected the customer and market demand orientation. Through the analysis of commercial vehicle noise, emissions, fuel consumption, safety and other regulations, this paper clarifies the trend of changes in commercial vehicle regulations during the 14th Five-Year Plan period. References | Related Articles | Metrics

Overview

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Research Status and Development Trend of Self-centering Center Frame DU Haixia 2021, 46(18): 204-208.  DOI: 10.16638/j.cnki.1671-7988.2021.018.058 Abstract ( )   The characteristics and working principle of the self-centering center frame are introduced, and some applications of the self-centering center frame are listed. It also introduces the research status of the self-centering center frame from the perspective of the types of the center frame, and expounds the current common structure of the self-centering center frame. Finally, the development trend of self-centering center frame is prospected. References | Related Articles | Metrics

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Research and Application of Visual Programming in Prametric Design of Automobile YANG Yuhu 2021, 46(18): 209-212.  DOI: 10.16638/j.cnki.1671-7988.2021.018.059 Abstract ( )   In order to reduce the deformation of plane geometry when it is projected onto the surface and improve the design and modification efficiency of three-dimensional geometric units when it is arranged on the surface, this paper applies visual programming technology to analyze and solve it. In addition, it explains the meaning of parametric design, summarizes the advantages and disadvantages of parametric design using visual programming technology, and summarizes its design form. Finally, the specific design ideas and methods are introduced, and illustrated with two cases. References | Related Articles | Metrics

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Intelligent Sensor Technology in Automotive Electronics QIAO Xinli 2021, 46(18): 213-215.  DOI: 10.16638/j.cnki.1671-7988.2021.018.060 Abstract ( )   This paper briefly introduces the intelligent sensor, discusses its role and value in the automotive electronic system, and uses a specific case as an illustration, finally puts forward some suggestions for strengthening the application of intelligent sensor, for the relevant personnel to refer to. References | Related Articles | Metrics

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Virtual Reality Technology Based Applications in Vehicle General Assembly System FENG Zhichao 2021, 46(18): 216-217.  DOI: 10.16638/j.cnki.1671-7988.2021.018.061 Abstract ( )   This thesis is to study the feasibility of Virtual Reality applications in vehicle system of automobile industry. After analyzing some typical application cases and the benefits, some of the scenarios could be extended in future. Related Articles | Metrics

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Research on Current Situation and Countermeasures of Automobile Maintenance Industry in Internet Age LIU Xingxing 2021, 46(18): 218-220.  DOI: 10.16638/j.cnki.1671-7988.2021.018.062 Abstract ( )   Under the background of Internet, automobile maintenance industry continuously introduces new technology, which makes all kinds of products and services develop intelligently. With the support of network technology, the construction of online platform for automobile maintenance can more systematically and comprehensively investigate automobile problems, and improve the service quality and overall efficiency of automobile repair industry significantly. Therefore, this paper analyzes the current situation of automobile maintenance industry and the difficulties faced in the Internet era, and puts forward the countermeasures of innovation and development of automobile maintenance industry from three levels for reference. Related Articles | Metrics