Modeling for Hydraulic Hub Motor Drive System Based on Node Cavity Method

A novel modeling method for the hydraulic hub motor drive system (HHMDS) is proposed to overcome the difficulty of using the complex AMESim model in the hardware-in-the-loop (HIL) test. The hydraulic pipeline model of the HHMDS is simplified by the lumped parameter approach. According to the node cavity method, a set of flow pressure differential equations is derived. These equations are used to describe the dynamic model of the HHMDS. To solve the rigidity problem of the model and improve the real-time performance of simulation, the HHMDS model is simplified with the integrated model and order reduction methods. Then, the simplified model is created through MATLAB/Simulink, and the accuracy of the modeling method is verified. In the three typical operating modes of the heavy commercial vehicle with HHMDS, the simulation results of the Simulink model and AMESim model are basically the same. At last, the model established by the Simulink is used in the HIL test. The test results are compared with the actual results to further verify the correctness of the modeling method in this article. The establishment of the new model by MATLAB/Simulink creates an accurate simulation test environment, and is convenient for the HIL test. The novel modeling method for the HHMDS is important for the study of the hydraulic hub motor drive vehicle (HHMDV).