Constructive Lyapunov control design for turbocharged diesel engines

This paper presents a control design method for diesel engines equipped wit h a variable geometry turbocharger and an exhaust gas recirculation valve. Our control objective is to regulate the air-fuel ratio and the fraction of recirculated exhaust gas to their respective set points that depend on eng ine operating conditions. Interactions between the two actuators and nonlin ear behavior of the system make the problem difficult to handle using class ical control design methods. Instead, we employ a recently developed contro l Lyapunov function (CLF) based nonlinear control design method because it possesses a guaranteed robustness property equivalent to gain and phase mar gins. The CLF is constructed using input-output linearization of a reduced order diesel engine model. The controller has been tested in simulations on the full order model as well as experimentally in the dynamometer test cel l.