Device for controlling operation of fuel evaporative purge syste

Details Device for controlling operation of fuel evaporative purge syste Device for controlling operation of fuel evaporative purge syste

1993-08-23

1994-06-28

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3704

Patent

active

053237510

ABSTRACT:
A device for controlling a fuel evaporative purge system having a solenoid valve arranged in a purge passage, comprises a unit for determining a maximum amount of fuel vapor to be purged, an air flow meter, a unit for calculating a maximum purging ratio of the maximum amount of fuel vapor to an amount of intake air, a unit for setting a purging ratio which is gradually varied during the purging process, and a unit for activating the solenoid valve. In the purging operation, the activating unit drives the valve at a duty-ratio identical to a ratio of the purging ratio to the maximum purging ratio.

REFERENCES:
patent: 4326489 (1982-04-01), Heitert
patent: 4641623 (1987-02-01), Hamburg
patent: 4763635 (1988-08-01), Ballhause
patent: 4809667 (1989-03-01), Uranishi
patent: 4865000 (1989-09-01), Yajima
patent: 4926825 (1990-05-01), Ohtaka
patent: 4932386 (1990-06-01), Uozumi
patent: 4953514 (1990-09-01), Beicht
patent: 4986070 (1991-01-01), Abe
patent: 5014674 (1991-05-01), Takeda
patent: 5020503 (1991-06-01), Kanasashi

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