Observer Based Tracking Control for Diesel Engine Air Path Subject to Inputs Saturation

In this paper, the problem of tracking control is investigated for turbocharged diesel engine. For this, an observer based tracking control is designed for the estimation of compressor power and then to drive pressures of the intake and exhaust to track desired trajectories which lead to polluted emissions reduction. To attenuate the tracking error and reduce fuel mass flow rate effects the
$H_{\infty}$
performance is included in the control design. We focus on controlling both EGR and VG T valves which represent the two actuators of the turbocharged diesel engine. Considering the fact that these valves may be saturated and their value should be positive, the input saturation is taken into account in the design. Both observer and controller gains are computed using a one step procedure via satisfying a set of Linear Matrix Inequalities (L MIs). Finally, simulation results are presented to show the efficiency of the proposed tracking control design.