Nonlinear Torque Estimation for Vehicular Electrical Machines and Its Application in Engine Speed Control

In the automotive propulsion systems, the engine performance is influenced by the torque variation required by the electrical machine for power generation. To attenuate this influence, this paper investigates the engine speed control problem with the compensation of electrical torque. First, a brief review of the models for the electrical machines, mainly, the simple alternator and PMSM, will be given, and then the nonlinear observer design problem is addressed which provides the torque estimation for the electrical machines. With the estimation schemes, a dynamical compensation method with the feedforward of torque estimation will be given for the engine control. Finally, the numerical simulation results demonstrate the effectiveness of the proposed approach.