Crank-Angle Domain Modeling and Control for Idle Speed

In this paper, we present simulation results for a variety of linear control design techniques, for simplified models of a GM V6 3800 IC engine. Control objectives focus on smooth engine operation at idle speeds, under significant accessory load disturbances, using air and spark as the primary control variables. A different feature of this work is that the engine modeling problem is approached from the crank angle domain; that is, the models for control design are based on the crank angle as the independent variable, as opposed to more typical representations set in the time domain. The models developed are based on first principles as well as on identification results from available data.