EGR rate estimation system for internal combustion engine.

摘要

A system for estimating an exhaust gas recirculation rate for an internal combustion engine. In the system, the EGR rate when its operation is steady is first determined to a desired value with respect to the engine operating conditions at least including the engine speed and the engine load, then the EGR rate is estimated as; $A\; delay\; time\; until\; the\; recycled\; gas\; enters\; the\; combustion\; chamber\; is\; determined\; and\; one\; from\; among\; the\; EGR\; rates\; or\; a\; fuel\; injection\; correction\; coefficients\; calculated\; therefrom\; consecutively\; is\; selected.\mathop{\mathrm{image}}$