Evaporative fuel-processing system for internal combustion engin

Details Evaporative fuel-processing system for internal combustion engin Evaporative fuel-processing system for internal combustion engin

1996-03-01

1997-11-25

Miller, Carl S.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3704

Patent

active

056900767

ABSTRACT:
An evaporative fuel-processing system for an internal combustion engine has an evaporative emission control system. An ECU carries out negative pressurization of the interior of the evaporative emission control system, by opening a purge control valve and closing a vent shut valve, and determines presence/absence of leakage from the evaporative emission control system, based on a rate of decrease in negative pressure within the system, by closing a purge control valve. Before the negative pressurization, the interior of the evaporative emission control system is opened to the atmosphere, and during the open-to-atmosphere, a pressure state within the fuel tank is estimated based on a rate of change in an output from a pressure sensor which senses pressure within the evaporative emission control system. The ECU determines whether the evaporative emission control system is normal, based on the estimated pressure state.

REFERENCES:
patent: 5305724 (1994-04-01), Chikamatsu
patent: 5333589 (1994-08-01), Otsuka
patent: 5355864 (1994-10-01), Kuroda
patent: 5396873 (1995-03-01), Yamanaka
patent: 5427075 (1995-06-01), Yamanaka
patent: 5448980 (1995-09-01), Kawamura
patent: 5501199 (1996-03-01), Yoneyama
patent: 5505182 (1996-04-01), Denz

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