Hammerstein model and parameters identification of EMU braking system

Abstract

The Hammerstein model of EMU braking system was ectablished in view of nonlinearity and importance of the braking system in ATO (automatic train operation). It was a kinetic model and accorded with the control law. The working process of the EMU braking system was introduced according to the transport mechanism of braking instructions. The static nonlinear function obtained by curve fitting was used to depict the braking characteristics table and the delay system was used to describe the delay characteristics of the braking instruction transmission and the braking controller operation. One first-order linear system represented the feedback process of breaking. The other first-order linear system described the remission process of EMU acceleration impulses. The above three links of braking constituted the Hammerstein model. Then, the way how to identify model parameters with the mind evolutionary algorithm (MEA) was introduced. Finally, simulation by EMU CRH2 proved the effectiveness of the proposed model and parameter identification algorithm.