Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1995-07-07
1996-06-11
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123518, F02M 3704
Patent
active
055245951
ABSTRACT:
An evaporating fuel control system includes a fuel tank, a pressure sensor for detecting a pressure in an upper space of the tank, a learning discrimination element for discriminating as to whether a zero point correction of the pressure sensor is once performed or not at all, a learning condition determination element for determining as to whether or not a learning condition is established in the case where the pressure of the tank is near the atmospheric pressure while a vehicle is normally running under the condition that the zero point correction is not performed at all, an air pressure return element for causing the upper space in the fuel tank forcibly to be a negative pressure by a negative pressure during a purging and for thereafter opening the fuel tank to the air, a zero point set element for setting an output value of the pressure sensor to the zero point after a predetermined time after opening the tank to the atmosphere, and correction means for correcting the output value of the pressure sensor by the zero point, thereby rapidly and certainly causing the fuel tank to be the atmospheric pressure at an initial correction or at the second time correction so as to improve an accuracy of the zero point correction of the pressure sensor.
REFERENCES:
patent: 5245973 (1993-09-01), Otsuka
patent: 5259353 (1993-11-01), Nakai
patent: 5267547 (1993-12-01), Chikamatsu
patent: 5408866 (1995-04-01), Kawamura
patent: 5460141 (1995-10-01), Denz
patent: 5479905 (1996-01-01), Ito
Fuji Jukogyo Kabushiki Kaisha
Miller Carl S.
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