| 摘要 |
The invention relates to a method for diagnosing the operation of a valve to purge a canister of an internal combustion engine, said method, carried out during a purge, comprising the following steps: a) detecting, at an instant t0, that the purge valve is open; b) executing a forced closing of said valve at an instant t2; c) measuring a pressure P1m of the intake manifold and calculating a corresponding modelled pressure P1c, at an instant t1 between the instant t0 and the instant t2; d) measuring a pressure of the manifold P2m and calculating a corresponding modelled pressure P2c, at an instant t3 after the instant t2; e) calculating a deviation E1 between P1m and P1c and calculating a deviation E2 between P2m and P2c; f) calculating a criterion C=E1-E2; and g) diagnosing the malfunction of said purge valve if the criterion C is lower than a predetermined threshold value Cs. |
