Diagnostic device for an evaporative emission control system

Details Diagnostic device for an evaporative emission control system Diagnostic device for an evaporative emission control system

1996-03-18

1997-09-23

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 3704

Patent

active

056693621

ABSTRACT:
In an evaporative emission control system, a canister adsorbs fuel vapor sent from a fuel tank of an engine. The canister is connected to an intake air passage through a purge gas passage and a purge control valve. A control circuit employs a pressure sensor to detect the pressure of the canister when the purge control valve is closed and when the pressure of the canister is stabilized. The control circuit carries out a failure diagnosis based on this pressure. Namely, when the pressure of the canister after it is stabilized deviates from the atmospheric pressure by more than a predetermined reference value, the control circuit determines that the canister has failed, i.e., the canister has a leak. Since the diagnosis can be carried out before starting the engine, the diagnosis can be correctly carried out without affecting the operation of the engine.

REFERENCES:
patent: 4949695 (1990-08-01), Uranishi et al.
patent: 5295472 (1994-03-01), Otsuka et al.
patent: 5299544 (1994-04-01), Kitamoto et al.
patent: 5355863 (1994-10-01), Yamanaka et al.
patent: 5373823 (1994-12-01), Kuroda et al.
patent: 5494021 (1996-02-01), Yoneyama
patent: 5497754 (1996-03-01), Ito

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