Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-02-22
1994-04-26
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3704
Patent
active
053057244
ABSTRACT:
Disclosed is an evaporative fuel purging apparatus used for an internal combustion engine. A canister having an absorbing agent for absorbing an evaporative fuel generated in a fuel tank of the internal combustion engine is provided. A drain control valve is provided on a drain port for opening the canister to the atmospheric air, and which is adapted to open and close the drain port. A purge control valve is provided on a purge passage communicating the canister to a part of an intake system, and which is adapted to purge the evaporative fuel absorbed into the canister through opening and closing the purge passage. A diagnostic device diagnoses the presence or absence of leakage in a purge system which is sealed up by closing the drain control valve and the purge control valve after pressure-reduction treatment. In the above apparatus, the drain control valve is opened after termination of the diagnosis by the diagnostic device, to open the canister to the atmospheric air through the drain port, and after an elapse of a specified time, the purge is started by opening the purge control valve. With this construction, it is possible to prevent the rapid change in the air-fuel ratio in re-starting the purge after termination of the diagnosis for the purge system, and hence to improve the stabilization of the emission and the drivability.
REFERENCES:
patent: 4949695 (1990-08-01), Uranishi
patent: 5158054 (1992-10-01), Otsuka
patent: 5172672 (1992-12-01), Harada
patent: 5191870 (1993-03-01), Cook
patent: 5193512 (1993-03-01), Steinbrenner
patent: 5205263 (1993-04-01), Blumenstock
patent: 5216998 (1993-06-01), Hosoda
Chikamatsu Masataka
Kuroda Shigetaka
Nakayama Takayoshi
Sato Toshihiko
Sawamura Kazutomo
Honda Giken Kogyo Kabushiki Kaisha
Miller Carl S.
LandOfFree
Evaporative fuel control unit for internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Evaporative fuel control unit for internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaporative fuel control unit for internal combustion engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1705500