EGR control of pressure-wave supercharged IC engines

Abstract

This paper addresses the problem of exhaust gas recirculation occurring when pressure-wave superchargers are used as boosting devices for IC engines. During hard accelerations, critical situations arise whenever large amounts of exhaust gas are recirculated over the charger from the exhaust to the intake manifolds of the engine. Such recirculations cause the engine torque to drop sharply and thus severely affect the driveability of the vehicle. In order to prevent such situations, the actuators such as throttles, valves, etc., have to be controlled in a coordinated way. Such a control system and its model-based design and verification on an engine test bench are described here in detail.