Title:
LEAK DIAGNOSIS DEVICE FOR VAPOR FUEL TREATMENT DEVICE
Document Type and Number:
Japanese Patent JPH11336620
Kind Code:
A
Abstract:
To prevent erroneous leak diagnosis of a vapor fuel treatment device.
A pressure condition of vapor fuel is sensed after a leak diagnosis condition is effected and initilizing is performed post to stopping of engine operation (S1 to S3). When the vapor fuel pressure is a specified level or higher, that is, when FVAPER=1, leak diagnosis is suspended. When the pressure is determined to be less than the specified value, that is, when FVAPER=0, leak diagnosis is started (S4, S5...). It is thus possible to avoid erroneous diagnosis that no leak is determined due to high pressure of vapor fuel.
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Inventors:
OKUMA SHIGEO
Application Number:
JP14733998A
Publication Date:
December 07, 1999
Filing Date:
May 28, 1998
Export Citation:
Assignee:
UNISIA JECS CORP
International Classes:
F02M25/08; F02D41/02; F02D41/22; F02D45/00; (IPC1-7): F02M25/08; F02D41/02; F02D41/22; F02D45/00
Attorney, Agent or Firm:
Fumio Sasashima
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