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30 July 2023, Volume 48 Issue 14 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education
Standards·Regulations·Management
Reviews


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New Energy Vehicle

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Performance Research and Experimental Test of Electric Vehicle Power Battery Thermal Management System QIU Jieyu 2023, 48(14): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2023.014.001 Abstract ( )   PDF (1334KB) ( )   In view of the problems existing in the thermal management of power batteries, this paper proposed a heat pipe assisted separation battery thermal management system, and built the power battery heat dissipation temperature characteristics of the experimental platform, the power battery thermal management system, analyzed the system to control the temperature and temperature difference of the battery pack. The heat dissipation performance of the power battery thermal management system under the condition of constant discharge of power battery at 1 C, 3 C, 4 C and 5 C, and under different "discharge-charge" cycle conditions were carried out respectively. The results show that compared with other cooling methods, the system has a more suitable operating temperature and can better reduce the temperature imbalance in the battery pack. Even at the extremely high discharge rate of 5 C, the maximum temperature difference can be controlled within 5℃, and the temperature imbalance within a single battery can be greatly improved. Especially in the case of long-term operation, the maximum temperature of each cycle is much lower than that of the traditional phase change material cooling mode, and the reliability and performance of the system are greatly improved. References | Related Articles | Metrics

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Research Progress of Energy Management Strategies for Hybrid Energy Storage Systems for Electric Vehicles WANG Ao 2023, 48(14): 7-13.  DOI: 10.16638/j.cnki.1671-7988.2023.014.002 Abstract ( )   PDF (648KB) ( )   At present, electric vehicle has become an important development direction of the industry. When a single energy source cannot meet the development needs, the composite energy storage system has more prominent advantages in improving electric vehicle power battery performance, extending driving range, and improving vehicle power performance and economy. Reasonable power distribution has become one of the focuses of the research and development of composite energy storage system. This paper first analyzes and summarizes the energy management strategies of composite energy storage system, summarizes the research progress among different energy management strategies, and then focuses on the analysis of power distribution cases under three classical control strategies. Finally, the energy management strategy of electric vehicle composite energy storage system is summarized and the future development direction is discussed. References | Related Articles | Metrics

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Precharge Path Analysis of New Energy Vehicle Brushless Motor Drive Controller TANG Lin 2023, 48(14): 14-18.  DOI: 10.16638/j.cnki.1671-7988.2023.014.003 Abstract ( )   PDF (2368KB) ( )   When the new energy vehicle is started and powered on, the high-voltage input will generate a surge current at the moment of opening, and when the surge current is too large, it will lead to the failure of electronic devices connected to the high-voltage. In order to prevent this, a precharge circuit can be added to the circuit system. Taking the brushless motor drive controller of new energy vehicles as an example, this paper expounds the role of the precharging circuit in the high-voltage brushless motor controller, and designs the corresponding precharging circuit. The experimental results show that the precharge circuit can avoid the damage of related devices caused by excessive surge current. References | Related Articles | Metrics

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Satisfaction Degree Prediction of Electric Vehicle Sound Quality Based on Principal Component Regressione CHEN Ke 2023, 48(14): 19-23.  DOI: 10.16638/j.cnki.1671-7988.2023.014.004 Abstract ( )   PDF (1886KB) ( )   In order to study the interior noise characteristics of electric vehicle and the evaluation method of sound quality satisfaction, the overall interior noise is scored subjectively by the grade scoring method, and the A-weighting sound pressure level, loudness, roughness, sharpness and language articulation index (AI) of the overall noise are calculated, while the sound pressure level (SPL), loudness and sharpness of the interior motor electromagnetic noise are calculated.The objective parameters of electromagnetic noise and overall noise are taken as the original variables together.Three principal components are constructed by dimensionality reduction method, and the principal component regression model is built with these as the independent variables. The results show that the mean absolute error and root mean square error of the principal component regression model are 4.3% and 11.6% lower than those of the multiple linear regression model, which can be used as an effective means to study the sound quality of electric vehicle. References | Related Articles | Metrics

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Early Fault Diagnosis of Power Battery Based on Improved Variance and Sample Entropy SUN Daiqing 2023, 48(14): 24-28.  DOI: 10.16638/j.cnki.1671-7988.2023.014.005 Abstract ( )   PDF (911KB) ( )   In order to solve the problem that it is difficult to detect the early minor faults of automotive power battery, this paper proposes a fault diagnosis method based on the combination of modified variance and sample entropy based on the actual operating voltage data of a vehicle. Firstly, the voltage data of the charging segment of a vehicle's power battery system is obtained to calculate the modified variance of each individual through the modified variance algorithm, and preliminarily determine the early fault according to the size of the individual variance. At the same time, combined with the change of entropy value of individual voltage sequence samples, accurate early fault diagnosis of automobile power battery is realized. The results show that the method proposed in this paper can effectively reduce the interference of battery cell voltage inconsistency, and dig out the early micro faults hidden in the battery cell as early as possible. At the same time, the fusion of sample entropy further improves the accuracy of early fault diagnosis. References | Related Articles | Metrics

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Design of an Automatic Control System for Air Conditioning in Electric Vehicles Assisted by Solar Energy TAN Yongjiang 2023, 48(14): 29-32.  DOI: 10.16638/j.cnki.1671-7988.2023.014.006 Abstract ( )   PDF (659KB) ( )   In recent years, China has vigorously promoted the new energy vehicles, and the new energy vehicle technology has ushered in a new opportunity. Automobile air conditioning system is very important to the safety and comfort of automobile drivers, and has a increasing influence. In order to ensure the safety and comfort of drivers and passengers, this paper adopts STC12C5A60S2 microprocessor as the core, build system hardware components and control circuit, embedded C language control algorithm, design a set of solar auxiliary electric car air conditioning automatic control system, implement solar power for car air conditioning, and intelligent temperature regulation in the cabin. The system is simple to install, strong matching, cost-effective, widely applicable to all types of new energy electric vehicles. References | Related Articles | Metrics

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Analysis of Influencing Factors of Consumers' Purchase of New Energy Vehicles XU Ling 2023, 48(14): 33-36.  DOI: 10.16638/j.cnki.1671-7988.2023.014.007 Abstract ( )   PDF (742KB) ( )   The number of new energy vehicles has continued to increase in recent years, but by the end of 2021, new energy vehicles in China accounted for only 2.6% of the total number of vehicles. Consumers have little awareness of new energy vehicles and are not willing to buy. From the perspective of consumers, this paper studies the factors that affect consumers' purchase of new energy vehicles through questionnaires, and uses frequency analysis, chi-square test and other methods to analyze the influencing factors. The results show that the important influencing factors for consumers to purchase new energy vehicles are battery range, imperfect charging infrastructure and lack of understanding of new energy vehicles, can effectively promote the consumption of new energy vehicles. References | Related Articles | Metrics

Intelligent Connected Vehicle

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License Plate Recognition Based on Improved YOLOv5 and LSTM JIA Deshun 2023, 48(14): 37-42.  DOI: 10.16638/j.cnki.1671-7988.2023.014.008 Abstract ( )   PDF (1286KB) ( )   Aiming at the problems of low efficiency, poor robustness and low recognition precision of existing license plate recognition systems, this paper proposed an end-to-end deep learning model for license plate detection and recognition in a high-precision real-time environment. First, adds an improved channel attention mechanism to the down-sampling process of the YOLOv5 network layer, which incorporates location information to reduce the information loss caused by sampling and improve the feature extraction capability of the model. Secondly, uses the combination of LSTM+ CTC to construct the recognition network to complete the recognition of license plate without character segmentation, which greatly reduces the training cycle and improves the recognition accuracy and efficiency of the model. This paper has conducted extensive experiments on chinese city parking dataset (CCPD), and the results show that the average recognition accuracy of the improved model of license plate recognition proposed in this paper reaches 98.03%, which is significantly better than the traditional license plate recognition technology, and the recognition effect is good in complex environment with strong robustness. References | Related Articles | Metrics

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Self-calibrating Convolution Object Detection Based on Improved YOLOv5 SU Haidong 2023, 48(14): 43-48.  DOI: 10.16638/j.cnki.1671-7988.2023.014.009 Abstract ( )   PDF (6147KB) ( )   Object detection is a research hotspot in the current industry and academia, and with the further development of deep learning and related needs, more accurate detection models are needed. YOLO, a new object detection method that emphasizes single-stage models. By studying the traditional object detection network model, this paper proposes a plug-and-play self-calibrating convolutional module. Based on the existing model YOLOv5, this paper inserts this module into the C3 module of the YOLOv5 backbone network. After comparative experiments, it is found that the curve graph, detection map and heat map generated by the two models show that the convolution module can effectively improve the target detection effect of the original YOLOv5 model. References | Related Articles | Metrics

Design and Research

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Analysis of Frequency Influencing Factors of Damper XU Gaoxin 2023, 48(14): 49-54.  DOI: 10.16638/j.cnki.1671-7988.2023.014.010 Abstract ( )   PDF (1617KB) ( )   The nonlinear characteristics of the structure of the damper make its own frequency influenced by the environmental factors, which is the difficulty in the frequency design of the damper. This paper mainly studies the influencing factors of the frequency characteristics of damper, and concludes that the frequency characteristics decrease with the increase of temperature and excitation. Combined with a case, based on the boundary conditions of temperature, acceleration and frequency at the maximum resonance of the whole vehicle, a 6.6 kg damper is calibrated on the bench, and it is verified on the whole vehicle. References | Related Articles | Metrics

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Design of Plastic Fuel Filler Door for a Vehicle PENG Yuanping 2023, 48(14): 55-60.  DOI: 10.16638/j.cnki.1671-7988.2023.014.011 Abstract ( )   PDF (4248KB) ( )   The plastic fuel filler door of automobile has the advantages of small weight, free modeling, easy integration and modularization of electronic control, and is used more and more widely. Therefore, it is very important to summarize the complete design method of plastic fuel filler door. This paper describes and summarizes the whole vehicle layout, concept A surface (CAS) release stage design, structural data design and design verification methods of plastic fuel filler door. The plastic fuel filler door has been installed, and the design method and process are verified to be correct, which can provide reference for the design of plastic fuel filler door. References | Related Articles | Metrics

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Exploration of Heavy Duty Automobile Message Parsing Tool LIN Zhe 2023, 48(14): 61-64.  DOI: 10.16638/j.cnki.1671-7988.2023.014.012 Abstract ( )   PDF (2477KB) ( )   The application of heavy duty automobile network communication is becoming more and more extensive, the communication of each control unit produces various message data, because the existing controller area network (CAN) bus message information interpretation tools cannot be widely used, the application range of messages is small. In order to make effective use of these message data and get more useful information from the message, this paper based on SAE J1939-71 protocol, combine with Pandas data analysis tool, use Python language to develop a set of program software for message data analysis, which is applied to vehicle fault troubleshooting, message result viewing and other scenarios, to improve the readability and utilization of vehicle messages. References | Related Articles | Metrics

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Modular Application of Automobile Front and Rear Suspension System HUO Cairen 2023, 48(14): 65-69.  DOI: 10.16638/j.cnki.1671-7988.2023.014.013 Abstract ( )   PDF (2176KB) ( )   In order to ensure the continuity and implementation of the platform, the key dimensions and module interfaces of the front and rear suspension systems are defined. According to the research and analysis of the mainstream models in the market, the performance bandwidth and size bandwidth of the vehicle modular platform are formulated. In the modular design of front and rear suspension systems, the evolution scheme is formulated to meet the development needs of different models. Adopt the modular development mode of automobile, it can effectively reduce the types of parts, shorten the product research and development cycle, reduce research and development costs, and improve product reliability. Finally improving the overall generalization rate of the vehicle. References | Related Articles | Metrics

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Research on Starting Process Control Strategy of Dual Clutch Automatic Transmission HONG Jie 2023, 48(14): 70-75.  DOI: 10.16638/j.cnki.1671-7988.2023.014.014 Abstract ( )   PDF (1850KB) ( )   In order to improve the dynamic response and smoothness of the starting process of the vehicle with dual clutch automatic transmission, a new starting control strategy is proposed. The target speed control method is adopted to control the torque of the engine and clutch respectively during the starting process, and the combination of the two can achieve the fast starting dynamic response and the smooth starting process. Finally, through Simulink mode, the generated code is downloaded to the transmission control unit (TCU), and the new control strategy is tested on the vehicle through the objective evaluation test system. The test results show that the new control strategy has a high objective score, which can not only achieve the rapid dynamic response at the moment of starting, but also achieve the stable engine speed during the starting process, and meet the requirements of vehicle starting smoothness and dynamic response. References | Related Articles | Metrics

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Analysis of DCT Clutch Torque Monitoring Strategy Based on ISO 26262 WANG Zhanghong 2023, 48(14): 76-80.  DOI: 10.16638/j.cnki.1671-7988.2023.014.015 Abstract ( )   PDF (2406KB) ( )   In order to ensure the functional safety of dual clutch transmission (DCT) transmission torque transfer, a monitoring strategy of clutch torque is designed based on the requirements of ISO 26262 standard and according to technical safety requirement of transmission control unit (TCU) should correctly calculate clutch torque. A method of calculating clutch pressure based on redundancy of clutch speed is proposed to monitor clutch torque. The monitoring model is created based on MATLAB/Simulink, and finally the model simulation test is carried out. The test results show that the designed monitoring strategy conforms to ISO 26262 requirements and ensures the functional safety of DCT torque transfer. References | Related Articles | Metrics

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Development and Verification of Low Rolling Resistance Tires for a Light Truck WU Zhaoliang 2023, 48(14): 81-85.  DOI: 10.16638/j.cnki.1671-7988.2023.014.016 Abstract ( )   PDF (1957KB) ( )   The low rolling resistance tires can effectively reduce the fuel consumption of the whole vehicle. In order to develop a low rolling resistance tire product suitable for light truck models, and verify the effect of reduced tire rolling resistance coefficient on tire grip performance, wear performance and vehicle fuel consumption, the paper starts from the design of tire rolling resistance reduction scheme, and uses the method of comparison and verification of low rolling resistance tire products and non-low rolling resistance products to verify the performance of vehicle braking, stability, wear and fuel consumption in detail. Through the test verification, the rolling resistance coefficient of the final developed low rolling resistance tire product is reduced by 17%, the fuel consumption of the whole vehicle can be reduced by about 5.35%, and the performance of braking, stability and wear can meet the needs of the whole vehicle. References | Related Articles | Metrics

Testing and Experiment

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Coordinated Control of Stability and Regenerative Braking for Distributed Drive Electric Vehicle MA Ning 2023, 48(14): 86-91.  DOI: 10.16638/j.cnki.1671-7988.2023.014.017 Abstract ( )   PDF (3033KB) ( )   In order to improve the driving range and ensure the braking stability of distributed electric vehicles, anti-locked braking system (ABS) and regenerative braking coordinated control strategy for distributed electric vehicles is proposed based on the brake pedal opening and vehicle speed. In this paper, the whole vehicle simulation model of distributed drive electric vehicle and the simulation model of regenerative braking system and ABS are established, and the off-line simulation is verified by the joint simulation of CarSim and MATLAB/Simulink. The simulation results show that the coordinated control strategy can ensure that the vehicle can obtain the optimal braking force and recover the braking energy at the same time. References | Related Articles | Metrics

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Causes Analysis and Optimization Design of Generator Bracket Breakage in a Light Truck QI Zonglei 2023, 48(14): 92-95.  DOI: 10.16638/j.cnki.1671-7988.2023.014.018 Abstract ( )   PDF (1608KB) ( )   In view the breakage failure of generator bracket in a light truck, through the hammering modal test and vibration test, the cause of the failure is determined that the first order frequency is too low and resonance occurred. According to the test results, the generator bracket structure is optimized by strengthening its stiffness and reducing the height of generator. The optimized generator system is analyzed by finite element method, the modal and strength met the design requirement. Finally, the optimized generator system is tested. The first-order frequency is close to the calculated result, and the generator vibration amplitude is greatly reduced. References | Related Articles | Metrics

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Modal Analysis of Automobile Radiator Based on Finite Element Method CAO Fangfang 2023, 48(14): 96-100.  DOI: 10.16638/j.cnki.1671-7988.2023.014.019 Abstract ( )   PDF (3137KB) ( )   Automobile radiator is one of the important parts of vehicle thermal management, which is prone to resonance and noise during vehicle driving, which may lead to leakage and other failures. This problem can be avoided by modal analysis in the design stage. Three methods are used to construct the finite element model of the heat exchanger, and the modal analysis is carried out. The first-order modal frequencies of the three methods are 80.89 Hz, 82.116 Hz and 108.94 Hz respectively. The formation differences of the two methods with similar first-order modal frequencies are compared, and the two methods with higher solving accuracy are finally determined. Based on these two methods, the first three mode frequencies of the heat sink in the actual working condition are solved, and it is found that the mode frequency is reduced, which is consistent with the practice. The research provides a reference for radiator simulation method and vehicle level finite element simulation model simplification. References | Related Articles | Metrics

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The Feasibility Analyze of RDE Test in Proving Ground RAN Linyao1 , LIU Kai2 , CUI Lianbo1 , WANG Shuaibin1 , ZHANG Taixi RAN Linyao 2023, 48(14): 101-108.  DOI: 10.16638/j.cnki.1671-7988.2023.014.020 Abstract ( )   PDF (1822KB) ( )   The real driving emission (RDE) test is affected by a variety of random factors, resulting in low repeatability of experimental results. In view of this, the different type of vehicle's RDE tests are carried out in the proving ground by using the portable emission measurement system (PEMS), to investigate if the test normality, completeness and dynamic characteristic satisfy the China Ⅵ emission regulation's demands. After proving ground RDE tests done, carry out the real road RDE test, in order to do the verification and comparison work. Lots of test data show that if drive properly, the final test result can meet the standard's requirement perfectly, and the dynamic parameters of the test, such as dynamic parameter, are controllable. It is doable to do the RDE test in the proving ground. References | Related Articles | Metrics

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A CVT Durability Test Control System Based on dSPACE CHEN Guigang 2023, 48(14): 109-113.  DOI: 10.16638/j.cnki.1671-7988.2023.014.021 Abstract ( )   PDF (1840KB) ( )   In the application development of continuously variable transmission (CVT) project, system-level durability test is one of the essential product design verification.This paper briefly introduces structure and working principle of CVT, and establishes a durability test method for CVT based on dSPACE DS1006 real-time platform, and the database is imported through MATLAB, the real-time control models are established by Simulink, and the automatic operation of the test is realized by Python. Examples are given to illustrate the method of monitoring the limit value of important parameters of the transmission during the test. This control system has high control accuracy and improves verification quality. References | Related Articles | Metrics

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Fatigue Strength Analysis of a Gas Card LNG Cylinder Bracket Crack LIU Hongmei 2023, 48(14): 114-118.  DOI: 10.16638/j.cnki.1671-7988.2023.014.022 Abstract ( )   PDF (1828KB) ( )   For the problem of liquefied natural gas (LNG) cylinder support cracked in durability test of a natural gas heavy truck, the durability performance of this structure is evaluated from two dimensions which are strength and fatigue analysis. The problem areas are consistent with the road test results, at the same time, after optimizing the structure for the existing risks, the problem is solved in the subsequent validation. It shows the simulation scheme is reasonable and can effectively guarantee the durability performance of this type of structure. References | Related Articles | Metrics

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Study on Influence of Stator Closed Slot on Cogging Torque of Permanent Magnet Synchronous Motor WANG Jianglan 2023, 48(14): 119-123.  DOI: 10.16638/j.cnki.1671-7988.2023.014.023 Abstract ( )   PDF (1689KB) ( )   The cogging torque of permanent magnet synchronous motor can be effectively suppressed by closed slot in stator teeth. Taking a permanent magnet synchronous motor with 6 slots and 4 poles as an example, the electromagnetic field model of the motor is established by finite element method, and the finite element simulation is carried out by ANSYS Maxwell software. The influence of the stator before and after designing closed slot on the cogging torque of the permanent magnet motor is analyzed. The manual sample is made and tested to prove the simulation results. The simulation and experimental results show that the reasonable design of the closed slot of stator teeth can effectively suppress the cogging torque and reduce the motor noise. References | Related Articles | Metrics

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Application of a Special Torque Sensor in CVT Software Calibration LIU Chunfeng 2023, 48(14): 124-128.  DOI: 10.16638/j.cnki.1671-7988.2023.014.024 Abstract ( )   PDF (2003KB) ( )   For continuously variable transmission (CVT), steel belt slipping is one of the common forms of failure. To avoid slipping of the steel belt, the clamping force calibration of CVT is an important part of transmission control unit (TCU) software calibration. The clamping force is mainly calculated based on engine torque. In view of the deviation between the torque signal sent by the engine to the TCU of CVT via controller area network (CAN) and the actual torque value transmitted to the clutch, and the CVT is not equipped with a torque sensor acquisition system based on cost consideration to cause calculation deviation of clamping force without the actual engine input torque. In this paper, strain gauges are creatively arranged in CVT to collect actual engine input torque, to support accurate control and calibration of clamping force, and get input torque offset map finally, effectively improving the lifetime of steel belts and the transmission efficiency. References | Related Articles | Metrics

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Stiffness Optimization of Tailgate Hinge Mounting Point Based on ABAQUS WANG Xiaofeng 2023, 48(14): 129-132.  DOI: 10.16638/j.cnki.1671-7988.2023.014.025 Abstract ( )   PDF (1972KB) ( )   The door horizontal overload is mainly aimed at the misoperation of the door user, although it is rare. However, if the door has been held for many times, resulting in poor performance or even failure to close the door, customers will complain about the quality and performance of the product. In the paper, the local models including the upper and lower hinges of the tailgate are established respectively, and the optimization scheme of the upper and lower hinges of the tailgate is obtained quickly. Then, the rationality of the optimization scheme is further verified by the simulation and experiment of the tailgate horizontal overload. The simulation and test results show that the upper and lower hinges of the tailgate are also designed to meet the requirements for the horizontal overload performance of the tailgate. References | Related Articles | Metrics

Process·Materials

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Surface Treatment Methods and Test Plan of Automobile Metal Parts GONG Yumei1 2023, 48(14): 133-136.  DOI: 10.16638/j.cnki.1671-7988.2023.014.026 Abstract ( )   PDF (1119KB) ( )   The surface treatment technology can not only maintain the original characteristics of the base material, but also give new performance of the product surface to improve the physical and mechanical properties of the product surface. This paper expounds the surface treatment methods applicable to commonly used machined parts, stamping, die-casting, forging and other metal parts produced by different processes in the field of automobile parts manufacturing, analyzes the test plan that should be selected for the parts after electroplating, shot blasting, sand blasting, shot blasting and spraying treatment, and provides reference and basis for the development and verification of automobile metal parts requiring surface treatment, so as to ensure the effect and quality of surface treatment. References | Related Articles | Metrics

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Development and Application of Data Inspection Software for Body-in-white Digital Factory Based on Process Designer WANG Jie 2023, 48(14): 137-143.  DOI: 10.16638/j.cnki.1671-7988.2023.014.027 Abstract ( )   PDF (2131KB) ( )   In order to improve the efficiency of planner checking supplier process designer (PD) data and standardize supplier data design behavior, data inspection software for body-in-white digital factory based on PD has been independently developed using innovative thinking models. The software is programmed using C# language in the. NET environment, and supports to check data node attributes and tree structures, and it is also supports the configurable function of checking rules, enhances the software's scalability, and the software can 100% check the compliance of node attributes and tree structure with technical specifications, and provides a good error view for easy problem finding and correction. At present, the inspection software has been applied to various vehicle model projects, which can effectively perform inspection work, greatly improving the efficiency and accuracy of data inspection, and the total data inspection time of a new vehicle model project PD digital factory can be shortened from 45 days to about 20 days, which is an excellent digital case of cost reduction and efficiency improvement. References | Related Articles | Metrics

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Analysis on the Development Trend of Heavy Truck Frame Manufacturing Process WANG Shuo 2023, 48(14): 144-148.  DOI: 10.16638/j.cnki.1671-7988.2023.014.028 Abstract ( )   PDF (4820KB) ( )   The frame assembly is one of the core components of the heavy truck, which carries various functional assemblies of the vehicle and is known as the backbone of the heavy truck. With the rapid development of the national economy, customers have new requirements for heavy truck products with low fuel consumption, multiple configurations, high horsepower and long life cycle, but the existing heavy truck frame assembly manufacturing process can not fully meet these new requirements. This paper has carried out discussions on customer demand interpretation, process status analysis, feasibility analysis of advanced manufacturing technology and other aspects, and concluded that lightweight material molding, flexible rapid drilling, local deformation of longitudinal beam electrophoresis of spare parts and other products are in line with the technological route of the development of heavy truck industry, and also form the development trend of the current frame assembly manufacturing. References | Related Articles | Metrics

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Calculation of Success Probability and Model of Error Distribution in Automobile Chassis Assembling PAN Tiemin 2023, 48(14): 149-156.  DOI: 10.16638/j.cnki.1671-7988.2023.014.029 Abstract ( )   PDF (2827KB) ( )   Chassis assembly is a key part of vehicle assembly, and the form and position tolerance of the assembled parts determines the success rate and cost of assembly. This paper first describes the physical model of assembly error probability, then abstracts it into a suitably simplified assembly mathematical model by using dimension chain theory, and deduces the formula and calculates the probability of assembly success rate. Finally, the theoretical 99.986% probability of success is obtained under the conditions of tolerance and precision requirements of related tooling equipment, which is larger than the actual value. After analysis, the model is moderately simplified and the difference meets the expectation with assumed conditions. The model has been widely used in a number of standardized multi-platform vehicle hybrid assembly lines. References | Related Articles | Metrics

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Sensitivity Analysis of the Fatigue Life for Lower Cross Arm of Automobile Suspension GU Fang 2023, 48(14): 157-161.  DOI: 10.16638/j.cnki.1671-7988.2023.014.030 Abstract ( )   PDF (1295KB) ( )   As one of the important components of automobile parts, the lower cross arm of automobile suspension has an important impact on the safety of automobile. In order to ensure the development quality of automobile suspension lower cross arm products, this paper not only analyzes its fatigue life and sensitivity, but also determines the key influencing parameters of automobile lower cross arm fatigue life through comparative analysis, namely, material tensile strength, bushing stiffness, load amplification factor and surface roughness.The proportion and influence degree of each parameter in the fatigue life and sensitivity of the lower cross arm of the vehicle suspension are obtained by orthogonal experiment and variance test. It is found that among many parameters, the load amplification factor has the most prominent effect on the life of the lower cross arm of the vehicle. Therefore, in the design of the lower cross arm of the actual vehicle suspension, the load amplification factor can be regarded as the key object for reasonable and scientific control to avoid or reduce its impact on the design of the lower cross arm of the vehicle suspension. References | Related Articles | Metrics

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Adhesive Nuts Bonding Technology and Application for CFRP Body LI Shaomao 2023, 48(14): 162-165.  DOI: 10.16638/j.cnki.1671-7988.2023.014.031 Abstract ( )   PDF (2047KB) ( )   In order to verify the connection reliability of adhesive nuts on carbon fiber reinforced plastics (CFRP), the curing rate and sensitivity to adhesive surface treatment requirements of polyacrylate (PA) and polyurethane (PU) structural adhesives are studied and compared, it is found that PA structural adhesive has better construction technology performance. Then, two kinds of adhesive nuts, M6 and M8, on the stiffener plate in B column, are taken as the research objects, and PA structural adhesive is used to make samples, the installation reliability of adhesive nuts and their performance after electrophoresis baking are investigated by testing the failure torque and transverse vibration axial force of adhesive nuts. The test results show that the connection performance of adhesive nuts meet the design requirements of products. This study fully demonstrates the connection reliability of carbon fiber composite adhesive nuts, and the design of the adhesive nut connection process has practical guidance significance for the application of carbon fiber composite materials in body. References | Related Articles | Metrics

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Automotive Aluminum Alloy Side Sill Beam with High Strength and Multi-stage Energy Absorption Performance WANG Lizhong 2023, 48(14): 166-170.  DOI: 10.16638/j.cnki.1671-7988.2023.014.032 Abstract ( )   PDF (1728KB) ( )   At the present stage, many new energy vehicles carried power batteries which are installed on the side sill beam. When the new energy vehicle encounters a side collision, it may lead to extremely dangerous accidents such as fire and explosion of the power battery in addition to causing injury to the personnel in the vehicle. Therefore, it is particularly important to improve the strength and energy absorption of the side sill beam of new energy vehicles. Aluminum alloy side sill beam with high strength and multi-stage energy absorption performance adopts the unique aluminum alloy formula from the raw material. The process procedure refines the alloy grain, and the innovative "目" shaped section structure is designed, so as to realize the timely collapsing and deformation during the collision process and absorb energy step by step by side sill beam,avoid transferring the collision energy to the structure inside and behind the vehicle. It not only realizes the lightweight of new energy vehicles, but also protects the safety of people and battery packs in limited space to the greatest extent. It can be widely used in the field of new energy vehicles,effectively promoting the technological progress and industrial upgrading for the new energy vehicle industry. References | Related Articles | Metrics

Automobile Education

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The Teaching Analysis of the Applied Undergraduate Course Automobile Construction (I) Based on the Background of Emerging Engineering Education XU Yanru 2023, 48(14): 171-175.  DOI: 10.16638/j.cnki.1671-7988.2023.014.033 Abstract ( )   PDF (1285KB) ( )   Based on the background of the construction of new engineering, taking the course automobile construction (I) as an example, it adheres to the diversified teaching concept of outputoriented, student-centered, and cultivating student with virtue, through the reorganization and expansion of teaching content, the introduction of modern electronic information technology to enrich teaching resources and means, the adoption of scientific teaching methods, the optimization of teaching process, the establishment of diversified and multi-subject teaching evaluation mechanism, the formation of professional education and ideological and political education synergy, to build student participation classroom,in order to improve students' enthusiasm and initiative to participate in course learning, ensure the efficiency and quality of course teaching, achieve the goals of the course and the needs of professional talent training, and to a certain extent promote the construction of the course. References | Related Articles | Metrics

Standards·Regulations·Management

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Demand Analysis and Value Enhancement of Standard Load Logistics Transportation Market Product LI Xianqing 2023, 48(14): 176-179.  DOI: 10.16638/j.cnki.1671-7988.2023.014.034 Abstract ( )   PDF (2332KB) ( )   The value of commercial trucks as a means of transport is no longer simply reflected in creating maximum operating profits when standard load logistics transportation market is developing rapidly. Based on the study of relevant data and practical investigation summary, trend of truck drivers' demand for commercial truck products is analyzed from three dimensions of operation scenario, regulation policy and consumption concept. The conclusion is that the competitiveness of commercial truck products mainly showed by high-quality, comfortable, intelligent upgrading achievements. A prediction in the next 3～5 years that the development trend of commercial truck products would focus on constantly meeting customers' material and spiritual needs, besides providing feasible suggestions for enterprises to enhance product competitiveness in the future is made. References | Related Articles | Metrics

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Establishment and Application of Quality System for Commercial Vehicle Research and Development HE Weiwei 2023, 48(14): 180-184.  DOI: 10.16638/j.cnki.1671-7988.2023.014.035 Abstract ( )   PDF (1194KB) ( )   Development quality assurance system is important component of product development system, the efficiency of development quality management is directly affects the outcome of product development. The paper based on IATF 16949[1-2] quality management system requirements, risk thinking, process method and PDCA management philosophythe, the experience of quality assurance in commercial vehicle product development is analyzed, method and application of constructing a complete development quality assurance system based on the whole process of product development. References | Related Articles | Metrics

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Efficient Design Scheme of Vehicle Manufacturing RPS Based on PLM Platform LI Xinglong 2023, 48(14): 185-188.  DOI: 10.16638/j.cnki.1671-7988.2023.014.036 Abstract ( )   PDF (2803KB) ( )   The application of RPS theory to achieve the tolerance control of high-quality vehicle dimension, but there are deficiencies in RPS design efficiency. In order to solve the problems such as lack of centralized management of RPS design resources, the complexity of RPS standard part positioning operation, and the inability of RPS to achieve correlation between stations, form a soluatiom based on the product life-cycle management (PLM) platform and combine with the actual business development mode. Through the practical application of the scheme, the preliminary evaluation shows that the RPS design efficiency has been improved by at least 30% compared with the past, and the RPS design efficiency and quality have been greatly improved. References | Related Articles | Metrics

Reviews

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Technology Status and Development Trend of New Energy Vehicle ZENG Jiacheng 2023, 48(14): 189-194.  DOI: 10.16638/j.cnki.1671-7988.2023.014.037 Abstract ( )   PDF (1605KB) ( )   According to the three types of new energy vehicles and their key core technologies at home and abroad, this paper summarizes their research status and development trend. In the research of pure electric vehicle and its key technologies, further improve the power density of power battery, the responsiveness of battery management system and the integration of drive motor. In the research of hybrid power system, the research on torque coupling, power coupling and energy synergy management needs to be accelerated. In the research of fuel cell vehicles, the high performance and long life of the stack, the research and development of the key components of the air/hydrogen supply system and the research of the cooling system are the primary tasks of its development. References | Related Articles | Metrics

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Application and Future Development Trend of Energy Saving Technologies for Passenger Cars LI Hongwei 2023, 48(14): 195-200.  DOI: 10.16638/j.cnki.1671-7988.2023.014.038 Abstract ( )   PDF (1381KB) ( )   In this paper, the development trend of various energy-saving technologies in the future is studied and judged through in-depth analysis of relevant data of various energy-saving technologies for passenger cars, and help industry enterprises scientifically choose the development path of energy-saving technologies. In general, the rapid application of technologies such as turbocharging, in cylinder direct injection, three cylinder engine, idle start stop, and advanced transmission has played a important role in the development of energy saving vehicle in the past five years. However, as the carrying rate of these energy saving vehicle technologies tends to saturate, enterprises need to further reduce the average fuel consumption level of automobiles by developing 48 V and hybrid electric vehicle (HEV) and other electrification technologies, and the industry chain needs to make corresponding layout in advance. References | Related Articles | Metrics

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Generation and Control of Engine Noise ZHANG Jiaxu 2023, 48(14): 201-204.  DOI: 10.16638/j.cnki.1671-7988.2023.014.039 Abstract ( )   PDF (1296KB) ( )   This paper analyzes the mechanism, noise classification and manifestation of engine noise. Divide the factors that affect the noise into combustion noise, mechanical noise, and aerodynamic noise, and elaborate on their mechanism and control measures. The optimization of reducing combustion noise can be achieved through methods such as combustion chamber optimization, airway optimization, and combustion parameter optimization. Reducing mechanical noise can be achieved by optimizing the clearance between the piston and cylinder, optimizing the valve train, and optimizing gear transmission. Reducing aerodynamic noise can be optimized from the source and transmission path directions. References | Related Articles | Metrics

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Discussion on the Reliability Technology of Vehicle Mounted Touch Switch CAO Dan 2023, 48(14): 205-208.  DOI: 10.16638/j.cnki.1671-7988.2023.014.040 Abstract ( )   PDF (1511KB) ( )   In order to ensure the quality of the vehicle mounted touch switch to meet people's requirements for effective triggering and rapid response of its functions, this paper makes an in-depth study on the reliability of the vehicle mounted touch switch. Firstly, the basic principle and function realization process of the vehicle mounted touch switch are described in detail, secondly, considering the differences of switches in different areas and different functions, this paper analyzes a variety of influencing factors that need to be paid attention to in the research, the development and design stage of products, such as installation location and human-computer perception,and finally, based on the influencing factors of reliability, the design requirements of vehicle mounted touch switch are proposed. Through the technical research on the on-board touch switch, this paper provides a theoretical basis for the subsequent research and development of such products, and has important reference value in the fields of vehicle building engineering applications and intelligent cabin quality evaluation. References | Related Articles | Metrics