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11 January 2024, Volume 49 Issue 1 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process·Materials
Automobile Education


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New Energy Vehicle

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Analysis of the Layout Architecture of the Electric Drive Assembly in the front Compartment of Battery Electric Vehicle WANG Renkun 2024, 49(1): 1-6.  DOI: 10.16638/j.cnki.1671-7988.2024.001.001 Abstract ( )   PDF (1411KB) ( )   Electric drive assembly is the core component of battery electric vehicle, and its location is the key to the front compartment layout of the vehicle, which is related to the vehicle performance, front compartment architecture strategy and platform expansion ability. This paper aims to establish a layout architecture for the front compartment of battery electric vehicle, analyzes the spatial characteristics of the front compartment layout of battery electric vehicle, studies the relationship between the key size factors in the layout of the front compartment electric drive assembly around the position of the key components of the front compartment electric drive assembly, and summarizes the layout method of the front compartment electric drive assembly of battery electric vehicle and the layout principles of the surrounding subsystems. References | Related Articles | Metrics

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Analysis on Insulation Characteristics and Insulation Protection Scheme of Hydrogen Fuel Cell WANG Bo 2024, 49(1): 7-12.  DOI: 10.16638/j.cnki.1671-7988.2024.001.002 Abstract ( )   PDF (2732KB) ( )   The insulation value of hydrogen fuel cell is affected by the coolant conductivity, and the insulation value will continue to decrease during operation until the insulation failure occurs. In order to reduce the frequency of insulation failure, this paper discusses and analyzes the principle of influence of coolant conductivity on fuel cell insulation based on insulation requirements and detection principle. The relationship between coolant conductivity and accumulated mileage and vehicle insulation value are quantitatively tested by means of static test and vehicle durability data acquisition, and then a insulation protection scheme is proposed, which is verified by real vehicle operation on the fuel cell demonstration vehicle. The results show that the insulation protection scheme can effectively avoid the occurrence of insulation faults in vehicle operation. References | Related Articles | Metrics

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Conversion of Leakage Rate and Test Method of Power Battery Direct Cooling Plate LIANG Fengtao 2024, 49(1): 13-16.  DOI: 10.16638/j.cnki.1671-7988.2024.001.003 Abstract ( )   PDF (919KB) ( )   This paper studies the conversion relationship between the liquid refrigerant leakage rate of the direct cooling plate of the power battery and the leak detection gas leakage rate. By studying the mechanism of the direct cooling plate leakage, a leakage conversion formula is proposed and compared with experimental data. The research results indicate that under the operating conditions of 2 MPa, 20 ℃, the helium detection value of the direct cooling plate is 1.504×10-5 Pa?m 3 /s according to the theoretical calculation formula proposed in this paper, the experimental leakage values are all in the order of 10-5 Pa?m 3 /s, which is very close to the theoretical calculation results, proving that this formula can effectively calculate the leakage rate of the direct cooling plate and can guide industrial applications. References | Related Articles | Metrics

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Analysis of Acceleration Performance Optimization on Four-wheel Drive Battery Electric Vehicle WU Shengyu 2024, 49(1): 17-20.  DOI: 10.16638/j.cnki.1671-7988.2024.001.004 Abstract ( )   PDF (864KB) ( )   Based on the mass production battery electric four-wheel drive model, the acceleration performance is improved to achieve the acceleration target of the track version model. Under the condition that the vehicle architecture is basically fixed, the method of optimizing the current limit of the motor, the actual site test calibration of the motor torque limit before starting, the replacement of the semi-hot melt tire, the lightweight of the wheel hub, and the hot tire can improve the starting skid time. At the beginning of the proposal, simulation software is used to calculate the reduction of 100 km acceleration time of each plan, and then the calibration value is confirmed by on-site calibration at the real vehicle site. In the final test, the 100 km acceleration time is shortened by 0.4 s to 3.5 s, reaching the leading level in the 100 km acceleration performance of battery electric models of the same class. At the same time, in the follow-up development, in order to accelerate the performance improvement, the development scheme of the vehicle subsystem is accumulated, and the accumulation of the measured data of the tire-ground model is improved, which has certain reference significance for the development of the vehicle dynamic performance. References | Related Articles | Metrics

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Analysis on Temperature Estimation for Battery Pack Base on Reduced Order Model WANG Qiang 2024, 49(1): 21-26.  DOI: 10.16638/j.cnki.1671-7988.2024.001.005 Abstract ( )   PDF (907KB) ( )   The traditional methods used to estimate the temperature of battery pack often use 3D simulation calculation, which generally has problems such as long modeling cycle, difficulty in solving and large amount of conclusion data. Not only the software and hardware platforms have special requirements, but also can not meet the high real-time application scenarios. Therefore, the analysis of battery pack temperature estimation based on dimensionality reduction model is carried out. Firstly, an equivalent one-dimensional discrete heat transfer model is built, and the partial differential equation is simplified to ordinary differential equation, and then the ordinary differential equation is transformed into a difference equation by numerical discretions, and then the interpolation scheme, boundary conditions and control strategy are introduced, and the transient recursive solution is finally completed. Three parameters are introduced into the model to correct the minimum, average and maximum estimated temperature of the battery pack. The results show that the dimensionality reduction model is fast, and the maximum error of the calculation results is about 2 ℃ before the correction, and the maximum error of the calculation results can be controlled within 1 ℃ after the correction. Therefore, the dimensionality reduction of the battery pack temperature is feasible to simplify the calculation, and the calculation efficiency is improved on the premise of ensuring the accuracy, which provides conditions for the subsequent multi-scenario application of the lithium battery pack temperature. References | Related Articles | Metrics

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The New Energy Heavy Truck Power Change Mode Commercial Analysis under the Background of "Double Carbon" HUANG Wei 2024, 49(1): 27-31.  DOI: 10.16638/j.cnki.1671-7988.2024.001.006 Abstract ( )   PDF (691KB) ( )   Under the background of the national "double carbon" policy, how to realize energy conservation and emission reduction has become a top priority for economic development. The supply side and the demand side of the heavy truck industry are also looking for a way to balance emission reduction and profit, and the power change mode of the heavy truck is a good choice. The operation mode of "vehicle-electric separation" has overcome the pain points of low operating efficiency and high initial investment of battery electric heavy trucks. It can effectively meet the requirements of heavy truck high frequency operation vehicles, improve vehicle operation efficiency, return rate and traffic convenience, and have higher economic and environmental benefits. This paper analyzes the policy orientation, the environmental economic mechanism of the industrial chain and the market competition pattern of the heavy truck, which has reference significance for realizing the commercial promotion requirements of the heavy truck. References | Related Articles | Metrics

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Research on Multiple-vehicle Collision Accident Reconstruction Based on PC-Crash Software LI Jian 2024, 49(1): 32-38.  DOI: 10.16638/j.cnki.1671-7988.2024.001.007 Abstract ( )   PDF (1947KB) ( )   In the past three years, the average annual number of traffic accidents in China has been more than two hundred thousand times, and the number of multi-vehicle collision accidents has also increased year by year. This paper is based on a complex traffic collision accident, which is equivalent to multiple simplified collision accidents according to the sequence of vehicle collision time, and each collision process only contains two accident participants. By verifying the damage of the driver in the accident scene and the trace inspection of the accident vehicle, the degree of human injury, the collision form of each vehicle and the motion speed before the collision are analyzed, and the accident simulation is carried out with PC-Crash software and its authenticity is verified. The results show that the human injury condition obtained by simulation is consistent with the actual condition; Compared with the actual inspection data, the error of the final stopping position and collision velocity of the accident participant is less than 10%, indicating that the simulation results are consistent with the actual inspection results. This method can simulate the complex traffic collision accident and the simulation has a certain authenticity, which provides a theoretical support for the traffic management department to identify the accident responsibility. References | Related Articles | Metrics

Intelligent Connected Vehicle

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Research on Intelligent Vehicle Assisted Driving Control Based on Model Prediction LIN Changbo 2024, 49(1): 39-45.  DOI: 10.16638/j.cnki.1671-7988.2024.001.008 Abstract ( )   PDF (1121KB) ( )   Assisted driving control is a critical function of intelligent vehicles, providing effective support to drivers by reducing driving fatigue and improving overall driving safety. However, achieving the delicate balance between offering the appropriate level of vehicle motion control and preventing collisions without disturbing the driver is crucial. This paper introduces a novel approach to assisted driving control in smart vehicles, leveraging model predictive control techniques. The proposed controller is designed to align with the driver's normal operating characteristics while proactively correcting steering inputs in potential collision scenarios, ensuring safety without compromising driver comfort. To address collision avoidance with surrounding vehicles, establish constraints based on their positions and incorporate model predictive control into the assisted driving design. Extensive simulation studies verify the effectiveness of the proposed assisted driving control method, demonstrating its ability to assist drivers in avoiding possible collisions with nearby vehicles and ultimately ensuring the driving safety of intelligent vehicle. References | Related Articles | Metrics

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Design and Development of Vehicle Cyber Security Technology ZHAO Nengqing 2024, 49(1): 46-50.  DOI: 10.16638/j.cnki.1671-7988.2024.001.009 Abstract ( )   PDF (1135KB) ( )   Because of the application of emerging technologies such as software defined vehicles, autonomous driving, intelligent connected vehicles, and vehicle road collaboration V2X, intelligent connected vehicles face severe safety risks and challenges. In order to improve the cyber security level of a new vehicle model, based on the brand-new technical framework platform iDEA, this paper analyzes the vehicle cyber security from the four dimensions of the cyber security target—security, privacy, property loss and non-security function. According to the identified cyber security risk and disposal decision, a reasonable cyber security mechanism is established. Designing controllers's cyber security based on the new vehicle cyber topology, it greatly improves the protection level of cyber security of the model. References | Related Articles | Metrics

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LDW Design and Test Based on ADAS Development Process XIAO Xiao 2024, 49(1): 51-56.  DOI: 10.16638/j.cnki.1671-7988.2024.001.010 Abstract ( )   PDF (1187KB) ( )   In order to improve driving safety and develop intelligent vehicles, the lane departure warning (LDW) system is designed and developed according to the V-type development process of intelligent network products. According to the safety goal of LDW system, functional safety standard of road vehicle, key use scenario of passenger car, stability and reliability requirements, the LDW system is designed in detail. It defines the system functions and switching conditions, carries out installation and perspective verification, expands the test and experiment process and carries out real vehicle testing on the basis of relevant standards such as JT/T 883－2014, and the design and verification process complement each other. The results show that the system meets the design requirements, can realize the expected function, and has practicability and reliability. References | Related Articles | Metrics

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Connected Vehicle Exit Ramp Control and Speed Optimization in Vehicle-road Coordinative Environment XU Jiaxin 2024, 49(1): 57-61.  DOI: 10.16638/j.cnki.1671-7988.2024.001.011 Abstract ( )   PDF (1659KB) ( )   This paper aims to explore a new intelligent connected vehicle technology, which can effectively solve the delay problem caused by slowing down or even stopping the traditional vehicle when it merges into the ramp conflict area. The two-stage optimization model can also be realized by STM32 and other hardware in the vehicle-road coordinative environment to achieve better results. Through the coordination of the autonomous driving function of the intelligent connected vehicle and the speed optimization model, the optimal trajectory of the vehicle driving in the on-ramp conflict area is found in combination with the GPOPS software, so as to reduce the unnecessary acceleration and deceleration of the vehicle in the off-ramp section of the expressway, reduce energy consumption, ensure safety and improve vehicle traffic efficiency. References | Related Articles | Metrics

Design and Research

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Research on Multi-objective Optimization of Production Line Balance Considering Man-Machine Coefficient Based on Improved NSGA-II Algorithm QIU Guobin 2024, 49(1): 62-70.  DOI: 10.16638/j.cnki.1671-7988.2024.001.012 Abstract ( )   PDF (1484KB) ( )   In modern manufacturing production lines, production equipment is an important component of the manufacturing industry. The efficient utilization of equipment has a direct impact on the match between production needs. This article refers to the concept of "human-machine coefficient" and constructs a multi-objective optimization function problem considering the line balance rate, smoothness index, and human-machine coefficient. An improved adaptive NSGA-II algorithm is employed to solve this model. The research findings indicate that by adjusting the human-machine coefficient, the line balance rate can be improved, and the smoothness index as well as production costs can be reduced while meeting customer cycle time requirements. Numerical examples demonstrate that compared to the traditional NSGA-II algorithm, the improved adaptive NSGA-II algorithm can find higher quality and broader coverage of approximate Pareto solutions, providing decision-makers with more choices. This study proves the effectiveness and practicality of the proposed research method, which provides an effective optimization approach for modern manufacturing production lines and serves as a reference for similar industries. References | Related Articles | Metrics

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Structural Design and Modal Analysis of Engine Exhaust Manifolds Based on ANSYS XU Xin 2024, 49(1): 71-74.  DOI: 10.16638/j.cnki.1671-7988.2024.001.013 Abstract ( )   PDF (1468KB) ( )   The exhaust manifold plays a crucial role in the engine exhaust system. The structural design of the exhaust manifold will affect the exhaust efficiency and service life of the engine. Different structural arrangements and manifold length designs have different impacts on exhaust performance. This article mainly focuses on the structural design of the engine exhaust manifold, and modal analysis is conducted on the designed exhaust manifold. After analysis, it can be concluded that the exhaust manifold is not affected by engine vibration resonance occurs due to factors such as vibration caused by uneven road surfaces, which improves the service life of exhaust manifolds and provides a reference for simulation analysis and research of exhaust manifolds. References | Related Articles | Metrics

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The Development of the Transmission System of FSAE Racing Car Based on V-shaped Development Model ZHANG Zhilin 2024, 49(1): 75-80.  DOI: 10.16638/j.cnki.1671-7988.2024.001.014 Abstract ( )   PDF (4590KB) ( )   The transmission system is an important part of the FSAE (Formula Society of Automotive Engineers) racing car. Developing a reliable and efficient transmission system is one of the keys to improving the competitiveness of the racing cars. The development of the transmission system involves multiple design calculations and verification optimization. Traditional waterfall development processes are often costly fault tolerance and inefficient. This paper introduces the V-shaped development mode into the development of the transmission system, makes overall planning for all aspects of the transmission system development, optimizes the collaboration mode, realizes the interaction and parallel of design calculation and check optimization, and improves development efficiency effectively. Compared with the traditional waterfall development mode, the practical results have proved that the introduction of the V-shaped development mode into the development of the transmission system shortens the development cycle by 23.81%, reduces the weight of the transmission system by 2.54%, and achieves ideal results in the performance test of the racing car. References | Related Articles | Metrics

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Research of Vehicle's Passing Capacity to the Step Road Based on Mathematical Modeling and Simulation Analysis CHEN Yanting 2024, 49(1): 81-85.  DOI: 10.16638/j.cnki.1671-7988.2024.001.015 Abstract ( )   PDF (1184KB) ( )   Passing capacity is one of the important performances of vehicles and step road is a kind of common terrains related to passing capacity. The ability of M-class vehicles to pass through step road is required by China national standard Motor Vehicles Passing Capacity Test Method (GB/T 12541 －2023). In this paper, the step road's passing capacity is studied based on mathematical modeling and simulation analysis with ADAMS. The minimum ground clearance of each system is analyzed when the vehicle pass through a specific step road. The calculations show that the mudguard II and the exhaust system bump with the ground when driving down the step road, and structural optimization is needed. The research method in this paper can be extended to other terrains related to passing capacity. Efficient evaluation of terrain passing capacity in vehicle design stage can help to identity and avoid collision risks in advance, save test resources, and shorten the development cycle. References | Related Articles | Metrics

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Development of Low-cost Hydraulic System for Two Speed Hybrid Transmission LIANG Dongwei 2024, 49(1): 86-90.  DOI: 10.16638/j.cnki.1671-7988.2024.001.016 Abstract ( )   PDF (1422KB) ( )   The hydraulic system of the traditional transmission and the hybrid transmission generally uses a combination of a pilot proportional solenoid valve and a slide valve to control the main pressure. The main pressure becomes the clutch control pressure after being regulated by a proportional reducing valve. These hydraulic systems are complex and costly. In order to reduce the cost of the hybrid transmission, a hydraulic system based on an orifice to adjust the clutch control pressure is developed. The simulation calculation is carried out through the AMESim simulation software. The design value of the orifice diameter is 0.70 mm, in order to ensure the product consistency and reduce the influence of manufacturing error, the tolerance value of the diameter of the orifice is ±0.015 mm. After making the sample, it is carried on the hybrid transmission for test, which is verified to be effective and meets the design requirements. References | Related Articles | Metrics

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Fault Analysis and Optimization Verification of the Flip Motor Relay in Cab LI Wei 2024, 49(1): 91-94.  DOI: 10.16638/j.cnki.1671-7988.2024.001.017 Abstract ( )   PDF (1769KB) ( )   Aiming at the problems of high failure rate and easy damage of relay in a heavy truck cab flip system, it is found that the root cause of the problem is the reverse voltage generated by the motor at the moment of starting or turning off, resulting in the arc erosion of relay contacts through circuit working principle analysis, fault reproduction and test verification. By analyzing and improving the circuit principle, adding protective diodes, realizing the suppression of the reverse voltage of the motor, and conducting tests and real vehicle verification, the relay ablation problem is solved, the failure rate of the flipping motor is reduced, and the reliability of the product is improved. References | Related Articles | Metrics

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Research on an Operating Safety Test System of Electric Vehicle ZHANG Guangxian 2024, 49(1): 95-98.  DOI: 10.16638/j.cnki.1671-7988.2024.001.018 Abstract ( )   PDF (2116KB) ( )   With the increase in the number of new energy vehicles, vehicle accidents occur frequently, so it is necessary to study an electric vehicle operation safety test system, rapid inspection of vehicles, in advance to detect hidden dangers of vehicles, so as to reduce the occurrence of traffic accidents, the system is mainly composed of mechanical system, electrical system, software system, using the overall design and then the design of the technical route. Under the premise of comprehensive consideration of the characteristics of passenger cars and commercial vehicles, the inspection and test system is developed to meet the requirements of the whole model. After successful research, the system passes the demonstration application of third-party testing and inspection institutions, and meets the requirements of rapid and non-disassembly detection of vehicles. References | Related Articles | Metrics

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Research on Compatibility of Friction Noise of Interior Materials PENG Yun 2024, 49(1): 99-105.  DOI: 10.16638/j.cnki.1671-7988.2024.001.019 Abstract ( )   PDF (3417KB) ( )   In order to reduce the risk of friction noise in the forward development process of automotive interior in advance, and reduce the trial and error cycle and cost of physical verification. This article introduces the basic principle of material stick-slip effect and material stick-slip friction test, and analyzes the risk level of friction noise caused by commonly used interior materials under different working conditions. A database has been established for the compatibility of friction noise of commonly used interior materials under normal temperature and humidity conditions, providing guidance for material selection in the early stage of product design. At the same time, the engineering application of the interior material noise compatibility database is introduced, guiding the forward control of interior friction noise. References | Related Articles | Metrics

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Energy Consumption Analysis of Transmission Actuating System ZHENG Haibing 2024, 49(1): 106-110.  DOI: 10.16638/j.cnki.1671-7988.2024.001.020 Abstract ( )   PDF (1983KB) ( )   This paper analyzes the energy consumption of different transmission actuating system concepts. The mathematical models are established for the energy consumption of four schemes: large displacement mechanical pump, small displacement mechanical pump+electronic pump, electronic motor+electronic pump, and double electronic pump. Taking the dual clutch transmission (DCT) as an example and based on the new European driving cycle (NEDC), the energy consumption of the four concepts are calculated. This article analysis the benefits of the different solutions, providing information on the selection of transmission actuating system solutions. References | Related Articles | Metrics

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Related Calculation of Secondary Stiffness of Plate Spring with Sub-spring Placement GU Youquan 2024, 49(1): 111-115.  DOI: 10.16638/j.cnki.1671-7988.2024.001.021 Abstract ( )   PDF (1398KB) ( )   In order to solve the problem of calculating the deflection and stiffness of a two-stage parabolic variable cross-section leaf spring with a sub-spring placed below, taking the 2+1 sub-spring as an example, based on the deformation principle of a simply supported beam in material mechanics, the corresponding deflection of each leaf of the leaf spring is analyzed, and a deformation consistency equation is established. According to the principle of virtual work, an integral equation for end load and deflection is established and solved, and the calculation methods for deflection, stiffness, and end load are summarized. Through experimental verification, it can be seen that the maximum deviation between the calculated value and the experimental value is within 5%, and the calculation theory is correct, which can provide a reference for the forward design of such leaf springs. References | Related Articles | Metrics

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Development and Application of Braking System of Hybrid Commercial Vehicle Based on ABS+ESC ZHANG Jing 2024, 49(1): 116-121.  DOI: 10.16638/j.cnki.1671-7988.2024.001.022 Abstract ( )   PDF (1346KB) ( )   The hybrid vehicle commercial vehicle development process based on the traditional chassis is based on the traditional anti-locked branking system (ABS)+electronic stability control (ESC) system commercial vehicle development process, the process of matching traditional fuel engine braking system and matching with the traditional commercial vehicle second-class chassis into hybrid power. The paper describes in detail the hybrid braking system in the traditional fuel brake system to add pure electric mode, matching electronically controlled air compressor, electronically controlled air dryer, ABS+ESC design, reservoir volume, electronically controlled foot brake valve and pipeline matching design. Through the matching calculation and selection, the whole vehicle is carried through various road tests to do a full rang of test verification process and application of braking performance. Through the hybrid tractor braking system braking efficiency verification, braking direction stability and other braking performance test, braking response time, braking deceleration, braking distance, parking braking performance and emergency braking performance to meet the requirements of national regulations. References | Related Articles | Metrics

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Research and Design of ECU Data Monitoring System Based on ASAM MCD Standards MA Guangwei 2024, 49(1): 122-126.  DOI: 10.16638/j.cnki.1671-7988.2024.001.023 Abstract ( )   PDF (1789KB) ( )   In this article, the ASAM MCD1, ASAM MCD 2MC, ASAM MCD3 standard and the universal measurement and calibration protocol (XCP) based on ASAM standard are studied. The ASAM MCD standard and XCP protocol data acquisition (DAQ) mode are applied to the design and development of electronic control unit (ECU) data monitoring system. The design principle and function of the ECU Data Monitor System are introduced. The ECU data monitoring system is applicable to all ECU that support XCP-on-CAN, has a very good versatility. References | Related Articles | Metrics

Testing and Experiment

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Finite Element Analysis of Traction Seat Legs Based on ANSYS CHEN Liuqing 2024, 49(1): 127-130.  DOI: 10.16638/j.cnki.1671-7988.2024.001.024 Abstract ( )   PDF (1743KB) ( )   Taking the traction seat legs as the research object, by changing the structure, reducing the weight and reducing the stress concentration, the purpose of improving the safety factor of the structure and lightweight is achieved. Firstly, a three-dimensional model of the traction seat legs and mounting plate is established, and the static loading condition of the traction seat leg is analyzed by using ANSYS; Secondly compares the strength of each leg under the same structure, different thickness, and the same thickness and different structures, so as to determine the optimal structure; Finally, the product is compared with the existing mature products. The results show that under the premise of reducing the quality by 8.2%, the safety factor is increased by 23% compared with the existing mature products, which not only improves the strength of the product, but also reduces the weight, and the optimization is more reasonable, and at the same time provides a basis for the optimization design of the traction seat legs in the future. References | Related Articles | Metrics

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Simulation and Optimization of Alignment Parameters of the Non-independent Rear Suspension Based on ADAMS LI Zhaoming 2024, 49(1): 131-135.  DOI: 10.16638/j.cnki.1671-7988.2024.001.025 Abstract ( )   PDF (1295KB) ( )   In order to solve the problems of the unreasonable variation law of the front beam angle and the large variation range of the rear inclination angle of the main pin, this paper establishes the ADAMS/Car model of the non-independent rear suspension of a sport utility vehicle (SUV) by using ADAMS software. During the experiment, the dual wheels are implemented in the same direction to analyze the changing factors of the alignment parameters of the rear suspension. ADAMS/Insight module is used to optimize the hard point coordinates. Nine factors that have the greatest influence on the suspension parameters are selected as design variables (the front point coordinate values of the upper and lower control arms of the suspension and the external coordinate values of the lateral thrust rod), and 5 suspension parameters such as wheel front beam angle and kingpin rear angle are selected as optimization objectives. Sensitivity analysis is conducted on the design variables,and the optimiza- tion value of hard point coordinates is obtained. The performance of the optimized non-independent rear suspension is improved to a certain extent, and the product quality is further improved, which has a certain reference significance for the optimization design of non-independent rear suspension in engineering. References | Related Articles | Metrics

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Analysis and Solution of Fatigue Durability Problem of a Vehicle Engine Hood QIAO Junxian 2024, 49(1): 136-140.  DOI: 10.16638/j.cnki.1671-7988.2024.001.026 Abstract ( )   PDF (2105KB) ( )   In this paper, through the research of sheet metal cracking, bump and other problems in the opening and closing durability test of the engine hood of a vehicle mode. The causes of the problems are analyzed systematically, the problem of insufficient limit of the engine hood cover is focused on, multiple solutions are proposed, and the feasibility of the scheme is verified by means of simulation analysis and test. At the same time, considering the cycle and input cost to solve the problem comprehensively, a low-cost scheme is proposed, that is the limit block adopts solid and optimized thread structure to solve the test problem. The research methods and conclusions of this paper have important guiding significance and engineering application value for similar problems in the design process of engine hood for various types of vehicles. References | Related Articles | Metrics

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Research on Fatigue Performance of Front Bumper of Light Truck Cab Based on Simulation and Test NIE Wenwu 2024, 49(1): 141-145.  DOI: 10.16638/j.cnki.1671-7988.2024.001.027 Abstract ( )   PDF (2677KB) ( )   In this paper, the fatigue performance of the front bumper of a light truck cab is studied by finite element analysis and test. Firstly, the finite element model of the front bumper is established, the strength calculation results are compared with the bench stress test results, and the finite element model is calibrated, which are the foundation for fatigue performance analysis. Secondly, the fatigue simulation analysis and fatigue test are carried out. The results are basically consistent, and both point to the existence of stress concentration in the original structure, and the fatigue performance cannot been meet the design and operating requirements. Finally, the original front bumper structure is optimized to remove the stress concentration area, and the fatigue performance of the optimized structure is simulated. Compared with the original scheme, the fatigue performance of the optimized scheme is greatly improved, and the final optimization scheme successfully passed the bench test and reliability road test, and is put into use. The combination of simulation and experiment provides a very effective means to study the fatigue performance of the front bumper of light trucks. References | Related Articles | Metrics

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Modeling and Simulation of Flat Brake Test Bench ZHANG Zihao 2024, 49(1): 146-152.  DOI: 10.16638/j.cnki.1671-7988.2024.001.028 Abstract ( )   PDF (3103KB) ( )   In order to solve the problem of automobile brake performance testing, this paper studies the testing mechanism of flat plate brake test bench. Using CarSim-Simulink co-simulation method, the simulation calculation model of flat plate brake test bench is established, and the accuracy of the model is verified by standard test. The model error is within ±5%, which can accurately reflect the change of front and rear axle braking force when different vehicles are braking. Based on the verified simulation model, the axle load transfer of the vehicle during braking is further studied. With the increase of the load, the maximum braking force and the maximum axle load transfer increase. References | Related Articles | Metrics

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Calculation Method for the Barycenter Position of Semitrailer Traction Trains LIU Yong 2024, 49(1): 153-157.  DOI: 10.16638/j.cnki.1671-7988.2024.001.029 Abstract ( )   PDF (1274KB) ( )   Measurement of vehicle centroid position is an important parameter in the design, manufacturing, and testing processes of automobiles, which has a significant impact on vehicle quality. How to measure the center of mass of vehicles, improve the accuracy of center of mass measurement and calculation, has become more important. The article takes the position of the vehicle's center of mass as the main research object, lists the main principles of measuring the center of mass position using the longitudinal tilt method, side-incline method, sway method, suspension method, and zero position method, and analyzes in detail the principles and calculation derivation process of the longitudinal tilt method and side-incline method. The main research content is how to calculate the centroid position of semi-trailer traction trains. Through a combination of measurement and theoretical calculation, a method for calculating the centroid position of semitrailer traction trains is proposed, which has a certain reference value for practical engineering applications. References | Related Articles | Metrics

Process·Materials

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Developmental Research of Monoblock Instrument for Driving Suitability Test HE Ziqin 2024, 49(1): 158-161.  DOI: 10.16638/j.cnki.1671-7988.2024.001.030 Abstract ( )   PDF (1363KB) ( )   Combining software and hardware development methods such as software technology and hardware data collection technology, as well as national industry standards, the paper designed a driving suitability test instrument and completed a test by proposing test scheme, developing software, collecting data from the vehicle such as steering wheel and pedals, and uploading them to the upper computer for result detection. This instrument integrates five non-visual testing items into one system, allowing testers to complete a series of tests without moving around. Characterized by simple structure, high integration, small footprint, and good portability, the instrument has solved the drawbacks of the previous generation of domestic testing instruments and can be widely used in fields such as operating enterprises, traffic management departments, and scientific research in universities. References | Related Articles | Metrics

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Optimization Simulation of Lightweight U-shaped Dump Container Based on New Material Application ZHENG Quan 2024, 49(1): 162-166.  DOI: 10.16638/j.cnki.1671-7988.2024.001.031 Abstract ( )   PDF (1745KB) ( )   Dump truck is the most basic special vehicle product for heavy commercial vehicles. In the development of dump truck industry in recent years in China, with the national attention to the environment, the problem of heavy weight of rectangular box structure in production and use has become increasingly prominent, and the box structure has begun to change from rectangular box to U-type box gradually. The model is modeled by three-dimensional software SolidWorks and analyzed by efficient finite element software. The stress of the container under different road conditions and loading conditions is simulated, and the container is optimized from the aspects of steel plate material and container structure according to the analysis results. References | Related Articles | Metrics

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Application of AlSi10MnMg in Vehicle Body Lightweight YANG Hongzhi 2024, 49(1): 167-171.  DOI: 10.16638/j.cnki.1671-7988.2024.001.032 Abstract ( )   PDF (2257KB) ( )   Vehicle body lightweight technology is currently the most core and critical lightweight path solutions, including structural lightweight, material lightweight, and process lightweight three categories of technologies. AlSi10MnMg aluminum alloy is an important applica- tion direction in material lightweight. Because it can obtain different ranges of mechanical properties and extremely excellent casting properties through different heat treatments, it has become the most common high-strength and tough die-casting alloy used in automotive structural parts. This article provides a detailed introduction to the AlSi10MnMg aluminum alloy material and its properties. The results show that the T5/T7 heat treatment states of the aluminum alloy are suitable for solid parts, such as solid mounting plates; The T7 state is suitable for thin-walled components, with the most typical components being the front shock absorber tower, rear shock absorber tower, and rear longitudinal beam. Finally, the design of the appearance, manufacturing process, and heat treatment system is carried out using the previous shock absorber tower as an example, which can provide reference for the design and development of front shock absorber towers for other vehicle models. References | Related Articles | Metrics

Automobile Education

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Analysis of Countermeasures for the Ideological and Political Classroom Construction of Intelligent Connected Vehicle Technology QU Yating, JIA Deshun, ZHANG Pengli 2024, 49(1): 172-177.  DOI: 10.16638/j.cnki.1671-7988.2024.001.033 Abstract ( )   PDF (1331KB) ( )   Under the background of "great thinking and politics" and "promising vocational education", in order to carry out the educational mission of cultivating morality and educating people, it is necessary to carry out the collaborative construction of ideological and political curriculum and curriculum ideological and political curriculum, and realize the "three-whole education" pattern of full education, full education and all-round education. With the rapid development of intelligent connected vehicle technology, it is imperative to cultivate new automotive talent. Therefore, it is of great significance to promote the ideological and political construction of intelligent connected vehicle technology courses. Through the analysis of the current problems in the construction of intelligent connected vehicle technology ideological and political class, the ideological and political elements are mined from all aspects and multiple angles before, during and after class, meticulous planning and implementation of ideological and political countermeasures, effectively promote the construction of intelligent connected vehicle technology ideological and political class, and cultivate new automotive talents integrating professional skills, social responsibility and family and national feelings. References | Related Articles | Metrics

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Application of Boost Theory in the Teaching of Theoretical Mechanics JI Jingfang 2024, 49(1): 178-182.  DOI: 10.16638/j.cnki.1671-7988.2024.001.034 Abstract ( )   PDF (1884KB) ( )   In the light of the problems existing in the teaching practice of Theoretical Mechanics, this paper studies the application of boost theory to the curriculum teaching reform. The disconnection between teaching content and engineering practice, insufficient teacher-student interaction, and weak subjective learning awareness among students are problems in course classroom teaching, which leads to low achievement of course teaching and also affects subsequent course learning. With the help of boosting theory, the teaching is fed back by engineering cases, students' psychology is used to improve their participation, and the assessment system is used to guide students, so that students can actively learn under the change of the external environment, so as to achieve the purpose of improving the teaching quality of courses. References | Related Articles | Metrics

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Training Talents Mode of Technical Detection of New Energy Vehicles Based on International Qualification Certification ZHANG Li 2024, 49(1): 183-187.  DOI: 10.16638/j.cnki.1671-7988.2024.001.035 Abstract ( )   PDF (1966KB) ( )   The shortage of technical detection talents for new energy vehicles has become an important factor restricting the new energy vehicle industry in China, the training of technical detection talents for new energy vehicles has not yet formed a mature one. Learning from the qualification certification of employees in high-voltage system of new energy vehicles proposed and implemented by Germany has become a mainstream of training talents for new energy vehicles in many higher vocational colleges in China. This project takes Germany international automobile qualification certification as a reference and combines the current conditions of new energy vehicle talents training in our school. It expounds some explorations and practices of new energy vehicle talents training in our school from the dimensions of talent training curriculum system teaching and teaching, hoping to provide reference and thinking for automobile talents training in other colleges and universities. References | Related Articles | Metrics

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Research on the Ideology and Politics Reform and Practice of Professional Courses in Higher Vocational Colleges in the New Era －Taking the Quality Analysis and Control of Automobile Manufacturing Course as an Example ZHAO Juanni 2024, 49(1): 188-192.  DOI: 10.16638/j.cnki.1671-7988.2024.001.036 Abstract ( )   PDF (1327KB) ( )   In the context of the reform and development of higher education in the new era, in order to proceed professional course teaching reform, through the analysis of the abilities and needs of quality management positions in automotive enterprisesa, the course reform concept is determined which based on "work tasks" and drawed on the actual work process of enterprise quality management positions. Then, the knowledge contents of the course were rebuilt, the ideological and political elements are deeply integrated, and new teaching models and evaluation systems are explored. As a result, students' professional abilities to analyze and solve problems are effectively cultivated, and their job adaptabilities are enhanced. Meanwhile, it provides new ideas for cultivating innovative talents in the automotive industry. References | Related Articles | Metrics

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Analysis on the Implementation Path of Undergraduate Talent Training in New Energy Vehicle Technology Major FANG Lei 2024, 49(1): 193-196.  DOI: 10.16638/j.cnki.1671-7988.2024.001.037 Abstract ( )   PDF (1147KB) ( )   The specialty of new energy vehicle technology belongs to higher vocational education, and the specialty of new energy vehicle engineering technology belongs to undergraduate level. The quality of talent training in both higher vocational and undergraduate levels is of great significance to the upgrading and development of the new energy vehicle industry. The article accurately locates the training objectives of new energy vehicle technical talents through enterprise research, hires excellent engineers, refines relevant typical engineering projects, takes the engineering projects as the carrier, refines sub-projects, decomposes into tasks, extracts the list of capabilities required to complete the project from the tasks, and deduces the supporting courses required to achieve the above capabilities, so as to build a complete curriculum system and jointly develop curriculum supporting resources. With the cooperation of schools and enterprises, builds a teaching scene of industryuniversity-research-creation, and builds the resources needed to complete the project. In talent training, "double teacher" teaching is adopted to give full play to the expertise of enterprise technicians, and jointly build a double-subject teaching team of production, learning, research and innovation. Through three to four years of courses, some typical enterprise projects can be completed, so that the trained talents can reach the level of field engineers, and finally complete the talent training objectives. References | Related Articles | Metrics

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Research on the Application of Project Teaching Method in the Course of Fundamentals of Automotive Machinery GUI Juan 2024, 49(1): 197-201.  DOI: 10.16638/j.cnki.1671-7988.2024.001.038 Abstract ( )   PDF (2164KB) ( )   The paper takes the course Fundamentals of Automotive Machinery as the focus of research, a comparative research method is employed to examine segmented project design and the Fischer model teaching resources. The concept of implementing segmented design project teaching activities, utilizing typical products as a framework, is proposed. Based on the Fischer model and using the integrated desert tree planting machine as an example, segmented project teaching design and teaching experiments are conducted. The results of the research indicate that this model facilitates students in acquiring practical skills and generating tangible outcomes during teaching activities. It effectively motivates students to learn, addresses the limitations of traditional classrooms, enhances classroom effectiveness, fosters students' practical and comprehensive professional abilities, and serves as a reference for teaching method reforms in other automotive majors at vocational schools. References | Related Articles | Metrics