| With the increasingly serious energy crisis in recent years and increasingly highlighted haze weather problems across the country, the issue about auto emission is more and more mentioned. Developing new energy vehicles vigorously has become the main trend. Hybrid vehicle has the comprehensive advantages of electric cars and the traditional internal combustion engine cars, so it becomes one of the research hot spot. This paper is based on single axis parallel hybrid electric vehicle by using the method of modeling and simulation. The research is mainly about dynamic coordination of engine, motor and clutch torque in the process of mode-shift, and provides a theoretical basis for hybrid mode-shift.In this paper, simulation model of single axis parallel hybrid electric vehicle is built based on Matlab/Simulink.The simulation model consists of engine model, motor model, nonlinear control model of diaphragm spring clutch, clutch actuator model, AMT model and vehicle dynamic model. The engine and motor models adopt the method of combining experiment and look-up table method to establish the first order dynamic model. Considering the influence of the axial deformation of platen and bending deformation of diaphragm finger on load characteristics, nonlinear control model of diaphragm spring clutch is established.This paper analyzes the characteristics of all kinds of working mode and the process of mode-shift of hybrid vehicles, and divides working mode-shift process into two categories:the mode that the engine switching in the power system and the mode that the engine switching out of the power system. The paper calculates the optimal torque of engine, motor and clutch in the mode-shift process by using the dynamic programming algorithm to make the mode-shift process comfort. Based on transferring torque stability in the process, this paper established the engine torque PID control, the motor torque PID controller and clutch actuator PID controller.By establishing the simulation model of single axis parallel hybrid electric vehicle, the paper analyses dynamic coordination control process of engine, motor and clutch torque in the four typical models with and without using the dynamic programming algorithm during the process of mode-shift. Results show that the transferring torque with dynamic coordination control algorithm can ensure the stability of hybrid vehicle in the whole process of mode-shift, and satisfy automobile power performance and comfort requirements. |
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