Observer-based output tracking of engine speed and torque reserve at idle with sliding mode control

A controller design procedure based on sliding-mode control is adopted to automotive engine control at idle condition. The aim is to track the engine speed and the torque reserve at their reference values despite unknown load-torque disturbances on the engine. Uncertainties in the system parameters and additional time delays are also taken into account. A validated nonlinear simulation model is used to assess the performance of the closed-loop system. Finally, it is shown by experimental results that the closed-loop system is robust with respect to the aforementioned uncertainties and disturbances.