Method for model-based multi-variable control of an EGR and a boost pressure for internal combustion engines

摘要

A method of controlling exhaust gas recirculation and manifold air pressure in an engine (10), the method comprising: determining an uncorrected exhaust gas recirculation command (222, 312) and an uncorrected manifold air pressure command (224, 314) based on monitored parameters of the engine (10) ; the uncorrected exhaust gas recirculation command (222, 312) and the uncorrected manifold air pressure command (224, 314) are each combined with feedback signals (316, 318), which describe a resulting exhaust gas recirculation rate (316) and a resulting manifold air pressure (318), in each case by a deviation term ( 322, 324) for exhaust gas recirculation and to generate manifold air pressure; a decoupling matrix (W) in a controller with multiple inputs and multiple outputs is applied to the deviation terms (322, 324) for the exhaust gas recirculation and the manifold air pressure to generate decoupled control signals (393, 395) for the exhaust gas recirculation and the manifold air pressure, the The decoupling matrix (W) for the motor (10) is determined by a system identification in such a way that a timing chain system (G) of the motor (10) becomes a diagonally dominant model of the motor (10); and controlling exhaust gas recirculation and manifold air pressure based on the decoupled control signals (393, 395) for exhaust gas recirculation and manifold air pressure.