Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1995-05-09
1997-11-04
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3704
Patent
active
056828624
ABSTRACT:
A method of purging a canister is disclosed, wherein purge ratio is variably controlled under predetermined condition when air fuel ratio closed loop or feedback control based on output of an oxygen sensor is effected. Accumulated amount of purge air (EVPCNT) is calculated. The purge rate is increased as EVPCNT increases. But, when EVPCNT exceeds a predetermined large value (N), the purge rate is fixed at a very small value, for example 1% since the fuel remainder in the canister is considered minimum. As purging process proceeds, i.e., as EVPCNT increases, the percentage of evaporated fuel within the purge air is subject to a drop. To compensate for this drop, the purge rate is increased to cause the purge air to increase in amount, thereby to keep a ratio of flow rate of evaporated fuel to flow rate of air constant.
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Kawamoto Yutaka
Sato Kazuhiro
Miller Carl S.
Nissan Motor Co,. Ltd.
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