Set point regulation of an EGR valve using a FORE with hybrid input bias estimation

In this paper we propose a hybrid control system performing set-point regulation of an Exhaust Gas Recirculation (EGR) valve of a Diesel engine. The control technique is based on a First Order Reset Element (FORE) embedded with an adaptive feedforward action whose aim is to provide asymptotic rejection of disturbances acting at the plant input. The feedforward action is adapted by suitable resetting laws occurring whenever the FORE is reset to zero. We first provide a formal analysis of the effectiveness of the adaptive reset system to guarantee asymptotic set-point regulation, and then we illustrate how the adaptive feedforward can be parametrized for improved transient performance. The proposed scheme is then illustrated via suitable laboratory experiments on an EGR valve in a few different operating conditions.