| With the continuous wide application of AMT transmission,not only the transmission is loaed in the fuel vehicle,but also more and more electric vehicles begin to load.Therefore,the demand for dynamic response characteristics of transmission system is getting higher and higher.The dynamic response characteristics of the transmission system are analyzed by matlab/simulink.However,there are many influencing factors in the study of powertransmission system,such as the dynamic characteristics of motor,gear meshing,gear clearance and so on.At present,the research on the dynamic response characteristics of power-transmission system abroad is relatively frontier,and the dynamic simulation of the test-bed is also carried out.Technology and related testing technology are relatively advanced,and the price and technical support of related equipment are improved by monopoly,which limits the technical development of dynamic test-bed in China to a great extent.In China,the research on dynamic response characteristics and inertia simulation of transmission system and control method of test-bed is not deep enough,lacking a series of technical support and theoretical research.Therefore,on the basis of carrying a suitable two-speed AMT transmission on the completed cloud 100 s,the dynamic modeling of the power-transmission system is carried out,and the power-transmission system department is simulated and analyzed in this paper.Based on the dynamic response characteristics of the vehicle,a PID control algorithm is proposed to reduce the impact on the dynamic characteristics of the vehicle.The reliability of the control method is verified by comparing the simulation with the test on the test platform of the transmission system,which provides theoretical guidance for further study of the dynamic response characteristics of the transmission system.Firstly,Converting the whole transmission system of pure electric vehicle into the moment of inertia of main components by the centralized least square methods,and the equivalent moment of inertia model of each component is established according to the simplified principle and hypothesis mentioned in this paper,respectively,considering the corresponding moment of inertia of each component in the case of first gear and second gear,and building the equivalent moment of inertia model of the power-transmission system.Secondly,by using the method of concentrated mass discrete model,the power-transmission system is simplified into an equivalent inertia body,and the stiffness and damping in the power-transmission system are treated with equivalent linearity.The dynamic equations of the motor and the transmission system are modeled respectively,and the effects of motor,transmission system and power transmission system on the dynamic characteristics of the whole vehicle are analyzed by using MATLAB/Simulink.Finally,a scheme of transmission test-bed design is put forward,and the structure and layout of the test-bed and the scheme of the test system are determined.in addition,the components are mainly selected from the power-transmission system elements based on the original electric vehicle cloud 100 s,and on this basis,two-gear AMT transmission is carried out.According to the design scheme of the transmission test-bed,the test-bed is built,and the torque dynamic characteristic response of the motor is simulated and verified.The validity of the control method is verified by the comparative analysis of simulation and experiment. |
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