Evaporative fuel control system for internal combustion engines

Details Evaporative fuel control system for internal combustion engines Evaporative fuel control system for internal combustion engines

1996-12-20

1998-12-22

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123357, F02M 3704

Patent

active

058508201

ABSTRACT:
An evaporative fuel control system for an internal combustion engine having a throttle valve arranged in the intake system. A canister adsorbs evaporative fuel generated in the fuel tank. A purging passage extends between the canister and the intake system, for purging evaporative fuel into the intake system at a location downstream of the throttle valve, and a purge control valve is arranged across the purging passage, for controlling the flow rate of evaporative fuel supplied to the intake system through the purging passage. When the engine is in a predetermined operating condition, the flow rate of evaporative fuel supplied to the engine is changed by controlling the purge control valve, then the degree of influence of the evaporative fuel on an air-fuel ratio of a mixture supplied to the engine is detected before and after the changing of the flow rate of the evaporative fuel, and an operating error of the purge control valve is determined based on the detected degree of influence.

REFERENCES:
patent: 4961412 (1990-10-01), Furuyama
patent: 5445132 (1995-08-01), Isobe
patent: 5445133 (1995-08-01), Nemoto
patent: 5476081 (1995-12-01), Okawa
patent: 5535719 (1996-07-01), Morikawa
patent: 5572980 (1996-11-01), Nakagawa

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