Nonlinear timevariant modelling technique to be used in driveline and engine control and observation

For rotational systems crank angle synchronous sampling systems are more convenient than time synchronous sampling systems. Therefore, in this paper a nonlinear modelling technique is presented which describes time domain linear systems in crank angle domain, with special regards to combustion engine applications. The conditions which must be fulfilled to design dynamic observers or controllers in crank angle domain are discussed. Simulation results are shown to demonstrate the capabilities of such a model.