Apparatus and method for controlling the exhaust gas recirculation rate of an exhaust gas recirculation device for an internal combustion engine during lean intake operation

摘要

The invention relates to a device and a method for controlling a rate of recirculated exhaust gas (AGR rate) of an exhaust gas recirculation device (AGR device) for combustion engines during lean operation. A correcting variable is predetermined for a control means of the AGR device. Said control means is arranged in a line for recirculated exhaust gas. A desired rate of recirculated exhaust gas is adjusted or maintained by means of said variable. According to the invention, a divergence of a calculated pollutant emission from a pollutant emission that is measured in the exhaust gas section (14) of the combustion engine (10) by means of a pollutant sensor (18) is detected and a correction value is determined for the correcting variable of the control means (28) of the AGR device (12) according to an amount of the divergence.