Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1991-08-12
1994-01-04
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, 731181, F02M 3704
Patent
active
052751449
ABSTRACT:
The evaporative emission control system of an internal combustion engine is tested by closing the purge air inlet from the atmosphere, applying a vacuum signal to the system, storing the value of a closed loop air/fuel adjustment at the time the vacuum signal is first applied, sensing for the vacuum signal at a specified point in the system and indicating a fault condition if the vacuum signal is not sensed within a first time period and when the amount of the closed loop air/fuel adjustment at the end of a second time period varies from the stored adjustment by an amount less than a predetermined amount.
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Conkey Howard N.
General Motors Corporation
Miller Carl S.
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