Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1993-12-01
1994-10-18
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3302, F02B 7700
Patent
active
053558634
ABSTRACT:
An evaporative fuel-processing system for an internal combustion engine includes an evaporative emission control system having a canister, a first passage connecting between the canister and a fuel tank, a second passage connecting between the canister and the intake system of the engine, and a purge control valve arranged across the second passage, a drain shut valve for opening and closing an inlet port of the canister, and pressure sensors for detecting pressure within the evaporative emission control system. The evaporative emission control system is negatively pressurized by introducing negative pressure from the intake system into the evaporative emission control system by opening the purge control valve and closing the drain shut valve, to thereby bring the evaporative emission control system into a predetermined negatively pressurized state, and then closing the purge control valve to complete the negative pressurization. Presence/absence of a leak from the system is detected based on a rate of decrease in negative pressure within the evaporative emission control system after the closing of the purge control valve. The leak detection is started when the pressure within the evaporative emission control system becomes substantially equal throughout the system after the completion of the negative pressurization.
REFERENCES:
patent: 4949695 (1990-08-01), Uranishi
patent: 5158054 (1992-10-01), Otsuka
patent: 5193512 (1993-03-01), Steinbrenner
patent: 5253629 (1993-10-01), Fornuto
patent: 5263461 (1993-11-01), Fujimoto
patent: 5269277 (1993-12-01), Kuroda
patent: 5275144 (1994-01-01), Gross
patent: 5295472 (1994-03-01), Otsuka
Kuroda Shigetaka
Maruyama Hiroshi
Sawamura Kazutomo
Suzuki Takeshi
Yamanaka Masayoshi
Honda Giken Kogyo Kabushiki Kaisha
Miller Carl S.
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