| 摘要 |
The average oxygen richness of the air/fuel mixture is measured during a first phase of operation of the motor in stabilised regime, during which the recirculation device (10, 11, 12) is inactive, and during a second subsequent phase, during which this device is activated, and the state of operation of the engine is diagnosed by comparing the difference (S0-S1) of the oxygen richnesses measured during these two phases, with at least one predetermined value ( DELTA S). As a variant, the richness or oxygen richness differences are substituted by the difference (ti0-ti1) of the average injection times established by a closed-loop control, during the two successive phases of the operation of the engine. Application to the detection of correct operation or defective operation of an exhaust gas recirculating device. <IMAGE> |
