Failure diagnostic device of evaporative gas purge control...

Details Failure diagnostic device of evaporative gas purge control... Failure diagnostic device of evaporative gas purge control...

2005-11-29

2005-11-29

McCall, Eric S. (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

Reexamination Certificate

active

06968732

ABSTRACT:
A state of an energization of a normal open type drain valve interposed between a fresh air introducing port of a canister and a drain filter is checked. And if the valve is not the energized state (open state), the tank internal pressure is checked. If the tank internal pressure is lower than a predetermined value and the state is maintained for a predetermined time, it is determined that the drain valve is close-stuck. If the drain valve is close-stuck, the pressure in the canister becomes negative, and the negative pressure is introduced in a fuel tank via a passage to an atmosphere and a pressure control valve. Closed sticking of the drain valve can be detected by checking the tank internal pressure.

REFERENCES:
patent: 5803055 (1998-09-01), Goto et al.
patent: 5996400 (1999-12-01), Nishioka et al.
patent: 2003/0019481 (2003-01-01), Kawano
patent: 9-264207 (1997-10-01), None

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