Method of leak detection during low engine vacuum for an evapora

Details Method of leak detection during low engine vacuum for an evapora Method of leak detection during low engine vacuum for an evapora

1996-03-05

1998-02-10

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3704

Patent

active

057157995

ABSTRACT:
A method of leak detection for an evaporative emission control system during periods of low engine vacuum includes the steps of pulsing a leak detection pump at a predetermined rate and determining whether engine vacuum level is low. The method also includes the steps of maintaining pressurization of the evaporative emission control system if the engine vacuum level is low, maintaining pressurization behind a vapor canister vent valve if the engine vacuum level is low, and detecting for leaks in the evaporative emission control system after a normal engine vacuum level is attained.

REFERENCES:
patent: 5297529 (1994-03-01), Cook
patent: 5390645 (1995-02-01), Cook
patent: 5553577 (1996-09-01), Denz

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