Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1997-10-21
1999-09-21
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3709
Patent
active
059540346
ABSTRACT:
A malfunction diagnosis apparatus for an evaporated fuel purge system comprises an evaporated fuel processing unit, an air valve arranged between a canister and the atmosphere wherein, when the air valve is open, the canister communicates with the atmosphere and, when the air valve is closed, the canister is sealed from the atmosphere, means for setting, based on an engine operating condition, a time required to lower a pressure within a least a portion of the evaporated fuel processing unit to a predetermined negative value, means for detecting an atmospheric pressure and means for changing the introduction time of the negative pressure in accordance with the atmospheric pressure. Means are provided for determining whether a failure of the evaporated fuel processing unit has occurred based on a pressure change in the system during a predetermined testing time after the predetermined negative pressure has been introduced into the evaporated fuel processing unit by closing the air valve and opening for the changed introduction time the purge control valve.
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patent: 5425344 (1995-06-01), Otsuka
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patent: 5735252 (1998-04-01), Blumenstock
patent: 5746191 (1998-05-01), Isobe
patent: 5765539 (1998-06-01), Isobe
Miller Carl S.
Toyota Jidosha & Kabushiki Kaisha
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