Defect diagnosing apparatus for evaporative purge system

Details Defect diagnosing apparatus for evaporative purge system Defect diagnosing apparatus for evaporative purge system

1997-08-07

1998-10-06

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123357, F02M 3704

Patent

active

058162224

ABSTRACT:
From the relationship between the pressure change in the evaporative purge system during purge cutting and the valve opening pressure of an air intake valve, respective valve opening pressures of a tank internal pressure regulating valve and a back-purge valve, each opening and closing a vapor passage, are found. As an actual valve opening pressure is found, the diagnosis can be effected under the circumstances where the tank internal pressure regulating valve or the back-purge valve is securely closed, whereby defect diagnosis can be effected as frequently as possible without setting a diagnosable pressure range such as that required conventionally.

REFERENCES:
patent: 5295472 (1994-03-01), Otsuka
patent: 5398661 (1995-03-01), Denz
patent: 5425344 (1995-06-01), Otsuka
patent: 5429097 (1995-07-01), Wojts-Saary
patent: 5479905 (1996-01-01), Ito
patent: 5483942 (1996-01-01), Perry
patent: 5617832 (1997-04-01), Yamazaki
patent: 5629477 (1997-05-01), Ito
patent: 5635630 (1997-06-01), Dawson
patent: 5653217 (1997-08-01), Ishizawa
patent: 5680849 (1997-10-01), Morikawa et al.

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