Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-12-17
1995-03-14
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
F02M 3302
Patent
active
053968735
ABSTRACT:
An evaporative fuel-processing system includes a first control valve arranged in a charging passage connecting between a fuel tank and a canister for adsorbing evaporative fuel generated from the fuel tank, a second control valve arranged in a purging passage connecting between the canister and an intake passage of the engine, a third control valve arranged in an air inlet port of the canister, and a system internal pressure sensor for detecting pressure within the system. The system is checked for a leak by monitoring a value of the pressure detected by the sensor after the system is negatively pressurized by closing the third control valve and opening the second control valve. The sensor is provided at a location upstream of the first control valve, and the first control valve is closed to detect a value of the pressure or a change thereof. Abnormality determination is carried out based on the detected value of the pressure. Alternatively, all of the above valves are closed in the negatively-pressurized state of the system to detect a first amount of change in the pressure, and then the first control valve alone is opened to detect a second amount of change in the pressure. Abnormality determination can be carried out based on the first and second amounts of change in the pressure, or by comparing a value of the pressure detected when the first and second valves are closed after negative pressurization with a value of the pressure detected after the first control valve is opened.
REFERENCES:
patent: 5158054 (1992-10-01), Otsuka
patent: 5191870 (1993-03-01), Cook
patent: 5193512 (1993-03-01), Steinbrenner et al.
patent: 5197442 (1993-03-01), Blumenstock et al.
patent: 5259355 (1993-11-01), Nakashima et al.
patent: 5261379 (1993-11-01), Lipinski et al.
patent: 5295472 (1994-03-01), Otsuka et al.
patent: 5299545 (1994-04-01), Kuroda et al.
patent: 5305724 (1994-04-01), Chikamatsu et al.
Chikamatsu Masataka
Maeda Ken-ichi
Maruyama Hiroshi
Sawamura Kazutomo
Seki Yasunari
Honda Giken Kogyo Kabushiki Kaisha
Moulis Thomas N.
Nelli Raymond A.
LandOfFree
Evaporative fuel-processing system for internal combustion engin 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-processing system for internal combustion engin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaporative fuel-processing system for internal combustion engin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-707976