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30 April 2022, Volume 47 Issue 8 Previous Issue   
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New Energy Vehicle
Intelligent Connected Vehicle
Design and Research
Testing and Experiment
Process and Equipment
Testing and Experiment
Process and Equipment
Automobile Education
Process and Equipment
Automobile Education
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New Energy Vehicle

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The Design of the Dual-processor Control System for a Hub Permanent Magnet Synchronous Motor MA Xiaojing 2022, 47(8): 2-6.  DOI: 10.16638/j.cnki.1671-7988.2022.008.001 Abstract ( )   PDF (851KB) ( )   In order to eliminate the hub motor control system failure caused by rain, snow, dust and poor heat dissipation during the operation of a hub permanent magnet synchronous motor. This paper designs a dual processor control system for a hub permanent magnet synchronous motor. In normal operation, the motor is driven by the main processor.When the main processor fails, the fault signal is sent to the auxiliary processor through the communication bus and switched to the auxiliary processor to drive the motor, which effectively improves the motor control system security and reliability. References | Related Articles | Metrics

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Configuration Design of the Electric Drive System for Pure Electric Sanitation Vehicles ZHAO Jinbao 2022, 47(8): 7-12.  DOI: 10.16638/j.cnki.1671-7988.2022.008.002 Abstract ( )   PDF (1206KB) ( )   Aiming at the problems of poor system integration and low comprehensive energy efficiency in the current mainstream pure electric sanitation vehicle configurations, a multi-mode high-efficiency electric drive system configuration based on the integration of parallel shaft gearbox and planetary row is proposed. By analyzing and comparing the working modes that can be realized by the configuration, the connection method of the configuration is finally determined, and the working modes with different connection modes are analyzed. Based on the dynamic index, the system parameters are matched and the vehicle dynamic model is built. The simulation analysis results show that the maximum climbing slope of this configuration of the pure electric sanitation vehicle can reach 35%, and the acceleration time of 0～50 km/h is 6.1 s, which verifies the effectiveness of the design scheme. References | Related Articles | Metrics

Intelligent Connected Vehicle

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The Network Security Architecture of the Internet of Vehicles LI Huijuan 2022, 47(8): 13-16.  DOI: 10.16638/j.cnki.1671-7988.2022.008.003 Abstract ( )   PDF (1189KB) ( )   The Internet of vehicles is an important application field where industrialization and informatization are integrated. The internet of vehicle and vehicle-people-road-cloud platform is achieved through a new generation of wireless communication technology. It is the key basis for the realization of intelligent cognition and autopilot. Driven by market demand and the guidance of national policies, Internet of vehicles industry has entered a stage of rapid development and application landing. The cyber attacks facing the Internet of vehicles are gradually shifting from single point to platformization, the problem of many network security vulnerabilities and insufficient security protection capabilities has become increasingly prominent. This paper is based on the analysis of the composition of the Internet of vehicles network. It summarizes the security problems faced by the components of the Internet of vehicles network architecture and proposes five major protection objects for the security of the Internet of vehicles network. It proposes how to build a security assurance system for the Internet of vehicles network from the perspective of combining safety protection and safety management. References | Related Articles | Metrics

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The Trajectory Planning of Intelligent Vehicle Steering to Avoid Collision LIU Zhongqiang 2022, 47(8): 17-20.  DOI: 10.16638/j.cnki.1671-7988.2022.008.004 Abstract ( )   PDF (674KB) ( )   With the rapid development of vehicle electrification and intelligence, the active collision avoidance control will be an important technology for intelligent vehicles. At present, The Technology of the vehicle longitudinal Braking to avoid collision is relatively mature, but the trajectory planning method in steering collision avoidance technology still has some practical problems, such as insufficient safety and low adaptability. In this paper, the scene characteristics of steering collision avoidance are firstly analyzed, then the quintic polynomial is used as the trajectory planning method for steering collision avoidance, and the lateral motion state and longitudinal motion speed planning of the vehicle are discussed respectively. Finally, the steering collision avoidance trajectory under the constraints of crash safety, stability and comfort is given. Therefore, the research work of this paper will provide a new idea and method to solve the trajectory planning problem of steering collision avoidance technology. References | Related Articles | Metrics

Design and Research

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A Fuzzy Sliding Mode Four-wheel Steering Control Method on Exponential Approach Rate DANG Donghui 2022, 47(8): 21-25.  DOI: 10.16638/j.cnki.1671-7988.2022.008.005 Abstract ( )   PDF (748KB) ( )   For wire-controlled four-wheel steering vehicles, a fuzzy sliding mode four-wheel steering control method based on exponential approach rate is proposed. A fuzzy sliding mode control strategy is designed that takes the steering wheel angle of the vehicle as the system input, and the steering angle of the front and rear wheels of the vehicle as the output. By tracking the preset ideal steering state of the two-degree-of-freedom vehicle, the actual steering state approaches the ideal steering state. By designing a fuzzy controller, the chattering phenomenon in the sliding mode control process is reduced. Finally, the consistency and robustness of the sliding mode control effect are verified through three different working conditions. The results show that the control method has good transient response characteristics and can ensure that the vehicle running state does not occur under a certain limit of interference variety. References | Related Articles | Metrics

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Structure Design and Simulation Analysis of a Convenient Fiber Reinforced Composite Preparation Device SUN Yi 2022, 47(8): 26-31.  DOI: 10.16638/j.cnki.1671-7988.2022.008.006 Abstract ( )   PDF (2974KB) ( )   Aiming at the disadvantages of complex structure and high manufacturing cost of the existing fiber stretching device, in order to ensure the tension on each bundle of fiber is controlled precisely during the process of fiber stretching and the properties of fiber products are guaranteed,a convenient fiber reinforced composite preparation device is designed in this paper. This device can ensure the accuracy of the stretching movement trajectory, and can be freely telescopic, which can not only increase the working width of the material stretching, but also shrink to make the size smaller. Build its 3D model in SolidWorks, and then in the finite element analysis software ANSYS stiffness, strength simulation analysis, optimization and verification of the design scheme, simulation results show that the stiffness and strength of the device meet the requirements of use. References | Related Articles | Metrics

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Key Control Factors of Low Drag Torque Calipers with‘八’Shaped Reset Spring Structure HONG Qingliang 2022, 47(8): 32-36.  DOI: 10.16638/j.cnki.1671-7988.2022.008.007 Abstract ( )   PDF (925KB) ( )   Vehicle running resistance directly affects vehicle fuel economy, and the influence of brake caliper drag torque on vehicle running resistance can not be ignored. It is imperative to carry out technical research on reducing brake caliper drag torque. The reset spring technology has an obvious effect on reducing the drag torque of the brake caliper, but its negative effect will lead to the increase of the braking idle stroke, which will have a negative impact on the braking safety and comfort of the vehicle. Through the experimental analysis of the drag torque, liquid demand and elastic force of the ‘八’ shaped reset spring caliper, it is concluded that the elastic coefficient of the reset spring has a significant impact on the above performances. The reasonable control requirements for the obstinacy coefficient of the reset spring are put forward, which provides the design basis for the structural design of the reset spring, the liquid demand of the brake caliper and the realization of the best feeling of the brake pedal. References | Related Articles | Metrics

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Optimization Control Analysis of a Belt Transportation System in Coal Mines WU Zhen 2022, 47(8): 37-40.  DOI: 10.16638/j.cnki.1671-7988.2022.008.008 Abstract ( )   PDF (1082KB) ( )   Coal mine belt conveyor systems mostly operate at a constant speed in actual operation, and the actual load of belt conveyor will change according to coal mining conditions. Therefore, under light load and no-load conditions, the belt conveyor still runs at a constant speed under full load, which is bound to cause a waste of energy. This paper analyzes the energy-saving operation theory of a coal mine belt transportation system, and designs the control algorithm suitable for the actual operation of a coal mine belt transportation system. The control algorithm is applied to the coal mine belt transportation system for optimal control. According to the load of the belt conveyor, the effect of light load, slow operation and no-load idle speed is achieved, so as to save energy. The monitoring software is developed to monitor the operation status of coal mine belt transportation systems based on Browser/Server(B/S)+Client/Server(C/S)hybrid architecture network mode. References | Related Articles | Metrics

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Design and Test Analysis of Hybrid Electric Control System SONG Xiaowen 2022, 47(8): 41-44.  DOI: 10.16638/j.cnki.1671-7988.2022.008.009 Abstract ( )   PDF (1331KB) ( )   Hybrid electric control system can reduce fuel consumption, reduce environmental pollution, and has good economy and power. By analyzing the functional requirements of the hybrid electric control system, the electric control system is designed from the single-chip selection of the electric control system, the design of the power supply circuit, the design of the input signal conditioning circuit and the design of the executive circuit. Develop a plan to test the functions of the hybrid electric control system, and carry out tests from two aspects of engine start control and regenerative braking control. It is concluded that the test parameters of the electric control system meet the design requirements, indicating that the hybrid electric control system can meet the requirements of the vehicle power demand. References | Related Articles | Metrics

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Design of an Automotive Condensate Conversion and Utilization Device XU Shuxin 2022, 47(8): 45-48.  DOI: 10.16638/j.cnki.1671-7988.2022.008.010 Abstract ( )   PDF (762KB) ( )   Automobile will discharge a large amount of condensed water on the road, which wastes water resources and pollutes the environment. How to rationally use auto condensed water and reduce waste and pollution is the focus of this paper. In this paper, a kind of automobile condensate water conversion and utilization device is designed. When the automobile air conditioner is turned on, the condensate water produced by the air conditioner evaporator and the outside world for cold and heat exchange is fully or partially recycled to the water storage device through the water tray and the water collection pipe, and then transported to the glass water tank for storage by the water pump. Because condensed water will have certain corrosion and bacterial pollutants, the condensed water stored in the glass tank needs to be treated before it can be used as automobile glass water, so as to realize the recycling of waste water. The automobile condensate conversion and utilization device has the characteristics of simple structure, low cost, convenient use, and a wide range of application, suitable for all kinds of automobile, which has broad market prospects and economic benefits. References | Related Articles | Metrics

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Steering Clearance Control of a Recirculating Ball Steering Gear YU Zhongchao 2022, 47(8): 49-52.  DOI: 10.16638/j.cnki.1671-7988.2022.008.011 Abstract ( )   PDF (1048KB) ( )   Aiming at the problem that the free clearance of the recirculating ball steering gear is too large and the steering stability of the vehicle is reduced, an optimal design method for the clearance of the recirculating ball steering gear is proposed. The method mainly starts from the two aspects of structure and use, analyzes the defects of the conventional technology, and obtains a new rack structure with a stepped structure in the middle tooth waist. The structure enables the steering gear to transmit with zero clearance, improves the driving stability of the vehicle, and ensures that the meshing does not cause jamming under the full steering stroke. At the same time, the bench performance test of the steering gear was carried out. The results showed that the steering gear achieved the optimization effect of zero-backlash engagement at the middle position of the stroke, and the performance and driving safety of the steering gear were improved. References | Related Articles | Metrics

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Development and Application of a Kind of External Disconnect Balance Suspension ZOU Xinghui 2022, 47(8): 53-59.  DOI: 10.16638/j.cnki.1671-7988.2022.008.012 Abstract ( )   PDF (1948KB) ( )   The bearing system accounts for a large proportion in the dead weight of the whole vehicle, and its own lightweight work is very important. At present, the components of the bearing system are mostly cast and stamped structures, which have large design redundancy or unreasonable design, and can not make full use of materials. Due to the demand of lightweight and driving stability, the application of disconnected balance shaft in the load-bearing system in the heavy truck market is becoming more and more common. The disconnected balance shaft can be divided into two states: internal and external. In this paper, through the structural comparison, material analysis, process comparison, CAE analysis and other technical means of the bidding product structure, the structural redevelopment of the external disconnected balance axle suspension and the verification and verification of the performance of parts and components, the development of the external disconnected balance axle suspension system is completed on the premise of ensuring the strength and modal level of the frame system, a complete set of design process and method of casting lightweight are established, which supports the lightweight design and development of the bearing system and makes a great contribution to the lightweight design of the whole vehicle. References | Related Articles | Metrics

Testing and Experiment

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Application Analysis of a Heat Recovery System of the Air Conditioning System in a Painting Workshop WANG Gang 2022, 47(8): 60-64.  DOI: 10.16638/j.cnki.1671-7988.2022.008.013 Abstract ( )   PDF (1230KB) ( )   Environmental control of constant temperature and humidity is required in the automobile painting workshop. The air supply and exhaust system has a large proportion of energy consumption in a painting workshop. In order to verify the effect of saving energy and reducing consumption of the air conditioning system with a heat recovery system, this paper introduces the principle and structure of heat recovery system, calculated the energy consumption of the air conditioning system in detail through application example. Energy consumption of the air conditioning system is compared through natural gas and electricity respectively. It is proved that the heat recovery system has remarkable energy saving effect on the operation energy consumption of the air conditioning system. It is instructive to the construction, modification and operation cost control of the air conditioning system in an automobile painting workshop. References | Related Articles | Metrics

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Comfort Simulation and Optimization of a Commercial Vehicle Based on ADAMS XIAO Fei 2022, 47(8): 65-70.  DOI: 10.16638/j.cnki.1671-7988.2022.008.014 Abstract ( )   PDF (1999KB) ( )   When a truck is on uneven roads such as washboard road and twisted road, the cab jumps greatly and is not accepted by the drivers and passengers. Based on the results of vibration transfer path analysis of a tractor suspension system, this paper concludes that the lack of cab suspension is the main cause of poor smoothness. Built vehicle model in ADAMS, and verify that the model can be used for secondary development by comparing with the experimental data. The cab suspension damping force is composed of a nonlinear model by MATLAB, and optimize it with ADAMS/View optimization tools. The optimization results show that the comfort has been significantly improved and verified in tractor. The level of vibration decreased by 34.9%. References | Related Articles | Metrics

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Correlation Analysis of Subjective Evaluation and Objective Evaluation of an Automobile ACC System ZHANG Ruihuan 2022, 47(8): 71-75.  DOI: 10.16638/j.cnki.1671-7988.2022.008.015 Abstract ( )   PDF (1072KB) ( )   In order to transfer the subjective feeling of driving to the engineering end, and guide adaptive cruise control system performance development, the correlation between subjective and objective evaluation indicators of an adaptive cruise control system was studied. Through multiple subjective evaluation and repeated objective tests of 5 vehicles, the subjective indicator values and 23 objective indicator values are obtained. Partial least squares method was used for regression analysis of subjective and objective values, and three subjective and objective correspondence models were established in different scenarios. The coefficient of determination R2 of the three models are all above 0.9, and the relative error is within 2%. Ten key objective indicators with higher impact on subjective values were selected. It is found that in the case of no target vehicle, the subjective feelings of drivers are mainly from the vehicle power performance, braking performance and comfort performance. In the case of vehicle intervention, collision time is increased into the key objective indicators, and drivers' attention to safety is significantly enhanced. References | Related Articles | Metrics

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The Influence of Pre-injection Timing on the Combustion and Emission Characteristics of Diesel Engines CHENG Zhiteng 2022, 47(8): 76-79.  DOI: 10.16638/j.cnki.1671-7988.2022.008.016 Abstract ( )   PDF (1149KB) ( )   In this paper, the influence of the pre-injection timing on the combustion and emission characteristics of diesel engines is studied, and the relevant bench tests are carried out by adjusting the pre-injection timing of a high-pressure common rail in-line four-cylinder diesel engine. The influence of the pre-injection time on the combustion characteristics such as the pressure rise rate, the instantaneous heat release rate, the effective pressure cycle variation coefficient, the cylinder temperature, etc., as well as the emission characteristics such as the specific emission of the number of ultrafine particles and large particles, and the specific emission of NOx. The test results show that as the main pre-injection interval increases, the peak pressure rise rate decreases, the instantaneous heat release rate peaks earlier, the ultrafine particle concentration decreases, the brake specific particle number and the brake specific nitrogen oxides continues to decrease. Therefore, the combustion performance of the engine can be improved and the emission of pollutants can be reduced by adjusting the pre-injection time without changing the overall structure of the diesel engine. References | Related Articles | Metrics

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The Application of CFD Simulation Analysis on Heavy Truck Wind Protecting Shield Design YIN Yuxian 2022, 47(8): 80-84.  DOI: 10.16638/j.cnki.1671-7988.2022.008.017 Abstract ( )   PDF (1127KB) ( )   In this paper, the heavy truck cooling module wind protecting shield is studied as an object. Using CFD, STAR and CCM+ software, the standard K-Omega turbulence model and the multiple reference frame model, this paper conducts the simulation analysis for the cooling module, cooling fan and the flowing field of engine compartment. Based on different dimension of wind protecting shield, obtain the surface average air velocity of radiator, charge air cooler, condenser in engine max torque point and max power point. Then choose proper wind protecting shield according to the analysis result of the average air velocity. References | Related Articles | Metrics

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Optimization of WLTC Cycle Fuel Consumption Based on Vehicle Energy Flow Analysis YANG Ruzhi 2022, 47(8): 85-91.  DOI: 10.16638/j.cnki.1671-7988.2022.008.018 Abstract ( )   PDF (2199KB) ( )   Energy flow test under the world light vehicle test cycle was carried out on a vehicle equipped with a turbocharged engine to determine distribution of vehicle energy utilization and loss. This paper analysed the reason of the energy loss and found the potential optimized direction. The simulation model of the whole vehicle model was built based on GT-Suite software and the model was checked on the energy flow test data. The model was used to optimize energy loss and reduced the world light vehicle test cycle fuel consumption. Evaluated oil-saving effect by executing optimum proposal. The results show that unburned chemical energy loss, heat exchange loss and exhaust loss can be reduced by means of optimized calibration strategy, improved engine cooling water or engine oil circulation loop and optimized ignition process, and then the world light vehicle test cycle fuel consumption was reduced by up to 3.68%. Moreover, the time of the engine cooling water temperature up to equilibrium temperature was shortened by up to 73 seconds and increased the transmission oil temperature obviously. References | Related Articles | Metrics

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Analysis of Test Accuracy Based on Pedestrian Protection Regulations and NCAP Evaluation ZHANG Fan 2022, 47(8): 92-97.  DOI: 10.16638/j.cnki.1671-7988.2022.008.019 Abstract ( )   PDF (1235KB) ( )   In the pedestrian protection test, the impact speed, angle and position accuracy of the head or leg shape have a significant impact on the test results. Based on the different requirements of pedestrian protection regulations and new car assessment program evaluation procedures for the impact speed, angle and position of the pedestrian protection impact module, the influence of gravity, friction, impactor shape, automobile front shape and other factors on the impact speed, angle and position are analyzed in this paper, and a compensation method to ensure the accuracy of impact speed, angle and position is proposed. Finally, the electromagnetic pedestrian protection impact test equipment is used as the carrier to verify the effectiveness of the compensation method through experiments. References | Related Articles | Metrics

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A Mixed Slip Rate-Deceleration Control Method Based on Sliding Mode Control ZHOU Yuyin 2022, 47(8): 98-103.  DOI: 10.16638/j.cnki.1671-7988.2022.008.020 Abstract ( )   PDF (1416KB) ( )   Mixed slip rate-deceleration control is a control method for joint control of wheel deceleration and slip rate applied in brake-by-wire system. It is used to reduce the influence of measurement noise on the control effect in the slip rate control system. Considering the influence of vehicle speed, this paper proposes a variable rate reaching law-based sliding mode control strategy. Then, a luenberger observer with slip rate as state variables is implemented to estimate longitudinal tire force. The improved algorithm is compared with the original one by joint simulation of Matlab and Carsim, the results show that the improved algorithm can improve the control performance significantly. References | Related Articles | Metrics

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An Experimental on the Abnormal Slap of a Pickup FEAD CAO Mingzhu 2022, 47(8): 104-108.  DOI: 10.16638/j.cnki.1671-7988.2022.008.021 Abstract ( )   PDF (2541KB) ( )   During the noise, vibration, harshness development of a pickup truck, there is an obvious slap abnormal noise when accelerating. Through the measure of the driver's right-ear noise and air compressor vibration, as well as the sound source location test, it is locked that the abnormal noise is mainly the air compressor. The belt between the pulley and the crankshaft vibration damping pulley slapped the pulley to produce abnormal noise. The test found that the amplitude of the belt vibration was more than 50%～100% higher than that of the normal car, and reached to 47 mm. The source and path of the abnormal noise were analyzed, and the acoustic treatments such as reducing the torsional vibration of the crankshaft, improving the installation rigidity of the air compressor bracket, increasing the modal frequency of the air compressor, improving the vibration isolation of the air conditioning pipeline and the sound package of the front wall were tested respectively. Finally, the abnormal noise is eliminated and the sound quality of the whole vehicle is effectively improved. The sound pressure level in the car is equal to that of competing vehicles.The abnormal noise is a typical front-end gear belt slap noise. Through the analysis and solution of the fault, the control parameters of the front-end gear train matching are proposed. References | Related Articles | Metrics

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The Influence of Upper Chord Differences of the Axial Fan Blade on its Dynamic Characteristics Based on CFD LV Yunpeng 2022, 47(8): 109-114.  DOI: 10.16638/j.cnki.1671-7988.2022.008.022 Abstract ( )   PDF (4401KB) ( )   In this paper, numerical simulations and experiments are conducted to study the effect of blade upper chord difference parameters on the dynamic characteristics of axial fans. First of all, this paper discusses the applicability of different turbulence models by comparing the measured values of the experimental objects, and it is concluded that the shear stress transfer model has the highest agreement with this experiment. Then, based on computational fluid dynamics numerical simulation and systematic analysis, the flow field and velocity field characteristics of each axial fan model are analyzed systematically. To sum up, within a certain range, the static pressure value and static pressure efficiency of the axial flow fan increase with the increase of the top chord difference of the blades, and the improvement effect of the static pressure value is slightly more obvious than that of the static pressure efficiency. However, if the winding difference exceeds the threshold, the improvement of the static pressure value is relatively limited. Finally, the reliability of the simulation analysis is proved by experiments. References | Related Articles | Metrics

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Simulation Analysis on Impact Heat Dissipation Performance of the Liquid Cooling Plate for Pure Electric Vehicles ZHANG Yongdong 2022, 47(8): 115-118.  DOI: 10.16638/j.cnki.1671-7988.2022.008.023 Abstract ( )   PDF (1633KB) ( )   In the heat dissipation modes of electronic components of pure electric vehicles, the liquid cooling method has better heat dissipation and cooling effect. The liquid cooling plate can control the working temperature of electronic components within the ideal range, and the noise is relatively low. This paper studies the commonly used liquid cooling plate, improves the traditional radiator in the form of impact cooling, compares the impact radiator with the traditional radiator, and discusses the pressure drop loss, pump power and substrate heat distribution between them in detail. The results show that the impact radiator has better heat dissipation performance. When the pump power is 0.2 W, the thermal resistance is reduced by 19.5%. References | Related Articles | Metrics

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The Research on Random Vibration Fatigue of a Fuel Tank Based on Abaqus WANG Shuai 2022, 47(8): 119-124.  DOI: 10.16638/j.cnki.1671-7988.2022.008.024 Abstract ( )   PDF (2771KB) ( )   Random vibration fatigue failure is one of the main failure modes of automobile parts, traditional design experience has some disadvantages, such as uncertain optimization direction, which leads to over design of products. In this paper, taking the fuel tank as the research object, Abaqus software is used to get simulation acceleration frequency response peak value based on the sweep frequency method and compare this value with test to determine the value of damping parameters, then the random vibration of the fuel tank is simulated using this value to obtain the Rmises stress of straps, we can evaluation of failure risk based on this. According to the vibration mode at the peak frequency response, the strap structure is optimized. Finally, the random vibration of the fuel tank is verified. The results show that the optimized strap structure has high strength and no fatigue fracture. The research results provide the optimization direction for product design, reduce the development cost and shorten the development lifecycle. References | Related Articles | Metrics

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Optimization of CAE Finite Element Analysis on Fatigue Life Test of Aluminum Alloy A356 Sichuan Jian'an Industry Company Limited 2022, 47(8): 125-130.  DOI: 10.16638/j.cnki.1671-7988.2022.008.025 Abstract ( )   PDF (8484KB) ( )   In the CAE finite element reliability life analysis in the early stage of product development, only the inherent material performance parameters of the software can not get more accurate analysis results. Because of different heat treatment and other processing processes of the same material, the stress life curve data will be very different. This paper mainly studies how to carry out finite element fatigue life analysis with high confidence for different structural products of materials with specific processing technology. Firstly, after static tension of several bars of specific materials, a number of fatigue tests under different loads in a certain proportion are carried out. Then the stress life curve data of the specific material is obtained after the statistical analysis of Weibull distribution, and it is used to optimize the data of CAE analysis software database. Then the optimized CAE analysis software is used to compare and verify the analysis results of a structural member with the actual bench test results of the structural member. When the error range of the two results is within the acceptable range, the CAE analysis software after database optimization can carry out high confidence fatigue life analysis for different structural products and different stress test items of the specific material in the early stage of product development. References | Related Articles | Metrics

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Research on Lightweight of the Aluminum Alloy Transmission Shaft of a Light Truck WANG Hongbin 2022, 47(8): 131-134.  DOI: 10.16638/j.cnki.1671-7988.2022.008.026 Abstract ( )   PDF (3755KB) ( )   Lightweight is an important technological breakthrough direction for commercial vehicles. The reduction of curb weight can achieve the goal of energy saving and emission reduction. In this paper, based on the new technology and test method of automobile lightweight, using the finite element software Hyperworks, the structural optimization and comparative analysis of a light truck foundation steel transmission shaft and aluminum alloy transmission shaft lightweight scheme are carried out. At the same time, the parts bench test equipment is built, the max torsion capacity of aluminum alloy transmission shaft is studied, and the vehicle noise,vibration and harshness test analysis is carried out, the CAE analysis of the aluminum transmission shaft lightweight scheme is equivalent to that of the base steel scheme, and the noise,vibration and harshness real vehicle performance of the aluminum alloy transmission shaft scheme is better than the base shaft, and the weight of aluminum transmission shaft is reduced by 12 kg, and the lightweight effect is remarkable. References | Related Articles | Metrics

Process and Equipment

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The Automatic Scheme of Replacing a Robot Gripper outside the Welding Line XU Wenkang 2022, 47(8): 135-140.  DOI: 10.16638/j.cnki.1671-7988.2022.008.027 Abstract ( )   PDF (1890KB) ( )   This solution is based on the production concept of convenience, safety, reliability and high efficiency. Through the gripper storage cart positioning device, the gripper storage cart is accurately positioned, and the gripper storage cart accurately locates the gripper, thus ensuring the position accuracy of the gripper. Ensure that the robot can pick up the gripper or place the gripper through a fixed running track every time. Through the air source connection device, instead of manual air connection, the pneumatic circuit of the gripper storage cart can be ventilated automatically, safely and quickly, so as to realize the opening and closing of the pneumatic mechanism of the gripper storage cart. Through the wireless coupler, the problem of signal connection and transmission between the gripper storage cart and the welding line is solved, and programmable logic controller electrification control is realized. Through program closed-loop control, the next step is strictly acted in accordance with the steps and signal feedback to ensure safe and efficient switching. Ultimately achieve the goal of improving production efficiency, reducing worker intensity, and improving equipment operating rate. References | Related Articles | Metrics

Testing and Experiment

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Analysis of Cylinder State and Action Time of Industrial Robot Hands HU Juexing 2022, 47(8): 141-145.  DOI: 10.16638/j.cnki.1671-7988.2022.008.028 Abstract ( )   PDF (1128KB) ( )   This article provides a new display method for the cylinder state and cylinder action time of the industrial robot gripper. With the help of Siemens function blocks, the status of the industrial robot gripper cylinder will be displayed in the input/output communication mode, and the abnormal information of the gripper cylinder will be defined by the coding rule of the fault code instead of the input/output signal point to display the abnormal condition of the industrial robot gripper cylinder. This method can realize the monitoring and display of the state and action time of the industrial robot gripper cylinder by the programmable controller, achieve the real interconnection function, reduce the abnormal inspection time of the gripper cylinder, predictively maintain the abnormal cylinder, and improve the work efficiency. References | Related Articles | Metrics

Process and Equipment

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Analysis of Technical Scheme of Automatic Painting Device for Automobile Body LUO Bo 2022, 47(8): 146-149.  DOI: 10.16638/j.cnki.1671-7988.2022.008.029 Abstract ( )   PDF (978KB) ( )   In order to solve the effect of artificial paint and a lot of paint fog and harmful gas harm to human body, this paper expounds the present situation of automobile automatic spraying technology. Then designed an automatic painting device, analyzed the car body automatic painting device effect and technical scheme, the results have more uniform, paint effect is better, high rust performance, high decorative, to adapt to the future higher environmental standards, complete the requirements of high quality car body painting. References | Related Articles | Metrics

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CAN Bus Fault Diagnosis and Case Analysis for Geely EV450 NING Xiaogang 2022, 47(8): 150-155.  DOI: 10.16638/j.cnki.1671-7988.2022.008.030 Abstract ( )   PDF (2420KB) ( )   Controller area network bus technology has great advantages in the automotive network communication, which can well realize the information exchange between the electronic control units. It can solve the problems existing in the traditional point-to-point information interaction, such as large number of wiring, high cost, high maintenance difficulty, complex work and nonexpandability. This paper takes the controller area network bus of Geely EV450 as an example, studies and analyses the fault diagnosis and elimination methods of controller area network bus, and the corresponding fault diagnosis cases are provided, which will provide some reference for automotive technicians and can be applied to the actual maintenance and diagnosis process. References | Related Articles | Metrics

Automobile Education

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The Teaching Reform of the Integration of Competition and Education in the Vehicle Engineering under the Background of Emerging Engineering Education LUO Tian 2022, 47(8): 156-159.  DOI: 10.16638/j.cnki.1671-7988.2022.008.031 Abstract ( )   PDF (1072KB) ( )   Based on the background of the characteristics of talent training, put forward the output oriented teaching fusion mode build applied talent training system and curriculum system method, practice and summarizes the new engineering background fusion vehicle engineering professional personnel training teaching system design concept, and the demand oriented "reverse design" reflects the new engineering interdisciplinary fusion and the characteristics of knowledge structure and course teaching system. The results of the three employment evaluation and competitions show that the teaching concept and talent training system of competition and education can highlight the student-oriented and ability-oriented teaching characteristics, and the students' innovation consciousness and ability are significantly improved, so the education reform mode of competition and education is worth promoting. References | Related Articles | Metrics

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Practice on Curriculum Ideological and Political Construction of the Automobile Electrical and Electronic System ZHAO Gengyun 2022, 47(8): 160-163.  DOI: 10.16638/j.cnki.1671-7988.2022.008.032 Abstract ( )   PDF (1034KB) ( )   Curriculum ideological and political education is an important way for colleges and universities to fully implement the fundamental task of Building Morality and cultivating people. Taking the course of automotive electrical and electronic systems as an example, this paper explores the ideological and political construction of the course. By combining the professional characteristics and curriculum characteristics, establish the curriculum ideological and political objectives based on the socialist core values, excavate the ideological and political elements contained in the professional knowledge, and organically integrate into the classroom teaching content in the ways of "explicit" and "implicit". Innovate teaching methods and means, take students as the center, organize teaching in combination with lanmoyun class platform, and carry out ideological and political education in interaction. Establish a multi angle and all-round evaluation mechanism of students' moral education, guide and promote the shaping of students' values. The practice of curriculum ideological and political education has achieved remarkable results. References | Related Articles | Metrics

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Under the 1+X Certificate System of Automobile Inspection and Maintenance Documentary Evidence Implementation Method LIU Dan 2022, 47(8): 164-167.  DOI: 10.16638/j.cnki.1671-7988.2022.008.033 Abstract ( )   PDF (1009KB) ( )   In order to promote the modernization level of vocational education in the new era and improve the competitiveness of employment. Based on the automobile inspection and maintenance technology major of Shaanxi National Defense Industry Vocational and Technical College, this paper introduces the implementation of the 1+X vocational skill level certificates in this college. By analyzing the connotation of the 1+X certificate system and the significance of documentary evidence integration, the paper proposes improvement measures in four aspects: talent training plan, curriculum system, "three teachings" reform, and practical training construction, which realizes the construction of documentary evidence under the 1+X certificate system. Its purpose is to cultivate compound technical and technical talents that meet the needs of enterprises and employers. References | Related Articles | Metrics

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Construction of New Energy Vehicle Laboratory with “Double World-class” WANG Liangcheng 2022, 47(8): 168-171.  DOI: 10.16638/j.cnki.1671-7988.2022.008.034 Abstract ( )   PDF (1011KB) ( )   In order to improve the construction and management level of new energy vehicle laboratory, this paper discusses the construction and management scheme of new energy vehicle laboratory in benchmarking "Double World-class" universities. Based on the construction of "Double World-class" new energy vehicle laboratory in colleges and universities published by the ministry of education, combined with the actual situation of University of Sanya, this paper summarizes the shortcomings of the construction of new energy vehicle laboratory and analyzes the root causes of the problems. This paper puts forward suggestions and countermeasures for the construction of new energy vehicle laboratory from the aspects of top-level design, fine management, first-class innovative talent training, communication and sharing, so as to provide reference for the construction of new energy vehicle laboratory. Through the closed-loop management of the whole process, the standardization and practicability of the construction of new energy vehicle laboratory are realized, which provides a solution for the construction of scientific and standardized laboratory in colleges and universities. References | Related Articles | Metrics

Process and Equipment

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Talent Training Strategy on a New Energy Vehicle Director of Vehicle Engineering under the Background of New Engineering HU Xuefang 2022, 47(8): 172-176.  DOI: 10.16638/j.cnki.1671-7988.2022.008.035 Abstract ( )   PDF (1032KB) ( )   New energy vehicles will gradually replace traditional vehicles and become the development direction of automobile industry. There is an extreme shortage of new energy vehicle talents. Vehicle engineering majors in application-oriented undergraduate colleges have set up talents training related to new energy vehicles. At present, there are many problems in the talent training of vehicle engineering and new energy vehicles in Application-oriented Colleges and universities, which affect the quality of talent training of new energy vehicles. This paper analyzes the problems existing in the training objectives, teachers, teaching materials, practice and so on. According to the existing problems, this paper puts forward the training strategy of new energy vehicle talents in vehicle engineering under the background of new engineering. This paper focuses on the construction ideas, curriculum system setting and implementation methods of the new energy vehicle direction curriculum system of vehicle engineering specialty, in order to provide reference for the talent training of new energy vehicle direction of vehicle engineering specialty in application-oriented undergraduate colleges, improve the talent training quality of new energy vehicle, and provide human resources guarantee for the rapid development of new energy vehicle industry. References | Related Articles | Metrics

Automobile Education

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Analysis on the Cultivation of Automobile Professionals in Higher Vocational Colleges Based on the Questionnaire of Graduates JIANG Nenghui 2022, 47(8): 177-182.  DOI: 10.16638/j.cnki.1671-7988.2022.008.036 Abstract ( )   PDF (1441KB) ( )   Guided by employment, an online questionnaire survey was conducted for 2021 graduates majoring in automobile inspection and maintenance technology. The questionnaire involves three aspects: basic employment status, professional ability development and suggestions on talent training. Through the detailed analysis of the questionnaire data, some enlightenment to the cultivation of automobile professionals is obtained, such as enriching the connotation of talent cultivation and comprehensively improving students' comprehensive vocational ability; Deepen school enterprise cooperation and cultivate "double teachers and three abilities" teachers; The whole process employment guidance, creating a closed-loop mode of talent training, and constantly optimizing the training mode of automobile professionals. Combined with the survey data, this paper analyzes the career development status and talent training suggestions of automotive graduates, hoping to provide some references for optimizing the talent training mode of automotive majors in higher vocational colleges. References | Related Articles | Metrics

Overview

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Automobile Spare Parts Export Packaging Analysis ZHANG Yapeng 2022, 47(8): 183-187.  DOI: 10.16638/j.cnki.1671-7988.2022.008.037 Abstract ( )   PDF (2604KB) ( )   Automobile spare parts assembly has become the main form of domestic vehicles export, and export knocked down spare parts packaging is an important part of the whole vehicle export process. In order to improve efficiency, sum up experience and better carry out bulk packaging and transportation, this paper summarizes the operation contents of the production process, analyzes the actual process from knocked down bulk parts classification, primary packaging, secondary packaging, packaging unit base, container selection, packaging scheme verification and so on, and puts forward the formulation method of knocked down bulk parts export packaging scheme, which will help to formulate the export inspection and quarantine requirements and ensure the reliable function of parts and components after reaching the destination The appearance is intact, the quantity is not missing, and the packaging scheme required to ensure the consistency of loading is ultimately conducive to the development of export business. References | Related Articles | Metrics

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Research Progress of Aerodynamics Performance in Vehicle Platoon QIN Qing 2022, 47(8): 188-204.  DOI: 10.16638/j.cnki.1671-7988.2022.008.038 Abstract ( )   PDF (2875KB) ( )   As an important part of intelligent transportation system, vehicle platoon technology has great significance in emission reduction, traffic optimization and safety improvement. Optimizing the aerodynamic performance of vehicle platoon is one of the important means to improve its energy saving and emission reduction. In this paper, the aerodynamic research of vehicle platoon is summarized in detail. Depending on the factors that affect the aerodynamic performance of the platoon, they are divided into internal factors (vehicle to vehicle) and external factors (environment to vehicle). Among them, the influences of vehicle shape, speed, number of vehicles, spacing and platoon form on the overall aerodynamic performance are described and analyzed. The influence of natural environment and road environment on the overall aerodynamic performance is expounded and analyzed. At the same time, the development and research status of each factor are reviewed.Finally, the key technologies and development trends of vehicle platoon aerodynamic research are summarized. The research results provide a theoretical basis for the promotion and application of queue driving in the future. References | Related Articles | Metrics

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Research Progress of Vehicle Pass-by Noise Sound Source Identification Methods ZHANG Xin 2022, 47(8): 205-209.  DOI: 10.16638/j.cnki.1671-7988.2022.008.039 Abstract ( )   PDF (1049KB) ( )   Vehicle pass-by noise has the characteristics of wide frequency band, varying with speed, numerous sources and complex mechanism. The beam forming and acoustic holography method based on microphone array and the transfer path analysis method based on "source-path-response" are suitable for the identification of noise sources in unsteady conditions such as vehicle pass-by noise. The development and application of the three methods are summarized in the field of the vehicle pass-by noise. Their characteristics are analyzed respectively. Finally, the development direction of the vehicle pass-by noise sources identification are expected, which provides a reference for the effective and accurate identification of vehicle pass-by noise sources. References | Related Articles | Metrics