Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1996-02-26
1997-01-07
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3904
Patent
active
055906346
ABSTRACT:
The evaporative emission control system in the present invention is equipped with a fuel tank and a canister connected to the fuel tank, and a pressure sensor connected to the canister and the fuel tank via a three-way switching valve. The pressure sensor can be selectively connected to the canister and the fuel tank by switching the position of the three-way switching valve. The control circuit, which may consist of a known type of microcomputer, detects failures in the system based on the smoothed pressure values of the canister and the fuel tank. The smoothed pressure value is obtained by smoothing fluctuations of the pressure detected by the pressure sensor. Since the characteristics of the fluctuations of the pressure in the canister and the fluctuations of the pressure in the fuel tank are different, the control circuit changes the degree of smoothing fluctuation when obtaining the smoothed pressure value of the canister and when obtaining the smoothed pressure value of the fuel tank.
REFERENCES:
patent: 5275144 (1994-01-01), Gross
patent: 5363828 (1994-11-01), Yamashita
patent: 5445015 (1995-08-01), Namiki
patent: 5448980 (1995-09-01), Kawamura
patent: 5479905 (1996-01-01), Ito
patent: 5505182 (1996-04-01), Denz
Miller Carl S.
Toyota Jidosha & Kabushiki Kaisha
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