Patent Number: 7,100,585

Title: Method and device for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve

Abstract: A method for diagnosing the operating condition of an internal combustion engine exhaust gas recycling valve. The method acquires a measurement value of a reference position of the recycling valve at a predetermined time corresponding to a normally closed position of the valve, calculates the difference between the acquired reference value and a reference value acquired during a diagnostic cycle previously carried out, and compares the calculated difference with a threshold value for detecting opening of the valve.

Inventors: Bourret; Stephane (Corbreuse, FR), Leprieur; Laurent (Limours, FR), Meurisse; Olivier (Antony, FR)

Assignee: Renault S.A.S.

International Classification: F02B 47/08 (20060101); F02B 47/00 (20060101)

Expiration Date: 9/05/02018