Evaporated fuel treatment device of an engine

Details Evaporated fuel treatment device of an engine Evaporated fuel treatment device of an engine

1998-06-03

1999-06-08

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123516, 123357, F02M 3704

Patent

active

059097272

ABSTRACT:
An evaporated fuel treatment device comprising a purge control valve for controlling an amount of fuel vapor fed into the intake passage from a charcoal canister. The fuel vapor concentration is divided into a first fuel vapor concentration changing proportionally to a purge rate of the fuel vapor and a second fuel vapor concentration changing without regard as to the purge rate of the fuel vapor. The first fuel vapor concentration per unit purge rate is reduced following a reduction in the amount of fuel absorbed in the canister. At this time, the second fuel vapor concentration is calculated from the amount of deviation of the air-fuel ratio from the target air-fuel ratio.

REFERENCES:
patent: 4961412 (1990-10-01), Furuyama
patent: 5476081 (1995-12-01), Okawa
patent: 5520160 (1996-05-01), Aota
patent: 5535719 (1996-07-01), Morikawa
patent: 5609142 (1997-03-01), Osanai
patent: 5680849 (1997-10-01), Morikawa
patent: 5696317 (1997-12-01), Rychlick
patent: 5699778 (1997-12-01), Muraguchi

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