Controlling exhaust gas recirculation in an engine with two recirculation valves comprises determining the actual recirculation rate for one valve and sending a position signal to this valve while closing the other

摘要

Operating an internal combustion engine (10) having an intake channel (11), two exhaust channels (20, 30) and two exhaust gas recirculation channels (40, 50) with valves (41, 51), where a control unit (60) generates valve position signals (S1, S2) corresponding to a target recirculation rate, comprises determining the actual recirculation rate for one valve and sending a position signal to this valve while closing the other valve. An independent claim is also included for apparatus (unspecified) for carrying out the above process.