Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1995-10-25
1998-03-17
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4100, F02M 2300, F02M 2500
Patent
active
057275378
ABSTRACT:
A fuel supply control system for an engine comprises a fuel injector for feeding fuel into the engine, a canister for temporarily storing fuel vapor, and an air-fuel ratio sensor for sensing an air-fuel ratio of the engine. The canister is connected to an intake passage downstream of a throttle valve to purge a purge gas, that is, air containing fuel vapor, into the intake passage. An amount of fuel to be injected from the fuel injector is corrected in accordance with output a signals of the air-fuel ratio sensor to make the air-fuel ratio equal to a target air-fuel ratio. An initial value of a fuel vapor concentration coefficient, which represents a concentration of fuel vapor in air fed into the engine, is calculated in accordance with a deviation caused when the purging operation starts. A decrement of the fuel vapor concentration coefficient caused when the purge gas is purged by a predetermined amount is calculated using a relationship between the decrement and the fuel vapor concentration coefficient, which relationship is prepared in advance. The fuel vapor concentration coefficient is further corrected by subtracting the decrement from the initial value whenever the purge gas is purged by the predetermined amount. The amount of fuel is reduced in accordance with the fuel vapor concentration coefficient.
REFERENCES:
patent: 5570674 (1996-11-01), Izumiura et al.
patent: 5579747 (1996-12-01), Sato et al.
patent: 5611319 (1997-03-01), Machida
patent: 5613481 (1997-03-01), Kitagawa et al.
patent: 5623914 (1997-04-01), Kawamoto et al.
Matsuoka Hiroki
Nakagawa Norihisa
Ohashi Michihiro
Nelli Raymond A.
Toyota Jidosha & Kabushiki Kaisha
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