Modeling And Simulation Of The Motor For Hybrid Electric Vehicles Using Bond Graph Method

The main content of the paper is a part of the department of education's issue "computer simulation and software design of the drive system of hybrid electric vehicle". Making use of bond graph method to simulate the motor of hybrid electric vehicle is discussed emphatically in this paper.The motor is a hybrid system of mechanism, electricity and magnet. When it is used in the electric vehicle (EV), especially in hybrid electric vehicle (HEV), which has multiple energy propulsion forms such as chemical, electrical, magnetic, hydraulic and mechanical systems, as a critical propulsion component, there is some difficulty to combine them together as far as the EV computer simulation is concerned. However, as a convenient tool for modeling the dynamic procedures of multiple energy systems, the bond graph serves as an ideal alternative to unify the EV components with different physical as well as chemical attributions. This technique is not limited to model the Permanent Magnet Brushless DC Motor (PMBLDCM) , and can be easily extended to other kinds of motors. The dynamic performance simulation is accomplished with the aid of MATLAB/SIMULINK.Based on analyzing the physical model of motor, one of the innovations of this paper is trying to simulate the PMBLDCM of HEV by making use of bond graph method. And that can be considered as the first attempt in this field in China. Then according to the bond graph model of motor and falling back on MATLAB/SIMULINK simulation platform, the models of motor and motor controller are set up. In the course of simulation experiments, the influence of the changing motor parameters on the output is analyzed.As the motor of HEV, it is required to meet the need of the frequency of start-up/shut-down, step-up/speed-down, the radical change between higher angular moment during low speed or climbing and lower angular moment during high speed, the enablement of regenerative braking. Comparing with the drive motor of routine industry, this requirement is stricter. Upon the basis of analyzingthe theory of the enablement of regenerative braking, and setting up the model of bond graph, the system model of motor is connected with bond graph mode of complete vehicle. Then in the complete vehicle simulating experiments are carried out in both "single motor system" and "dual motor system", and the characteristics are summarized under the condition of DC LOWPOWER and DC_EUDC.The study makes it clear that bond graph method is suit for the modeling of multiple energy systems. The motor model sets up a good example for the whole EV system simulation, especially for the diver system, which is valuable for the HEV's Research and Development.