Self-diagnosis apparatus in a system for prevention of scatterin

Details Self-diagnosis apparatus in a system for prevention of scatterin Self-diagnosis apparatus in a system for prevention of scatterin

1991-02-25

1993-10-12

Raevis, Robert

Measuring and testing

Simulating operating condition

Marine

G01M 1900

Patent

active

052514773

ABSTRACT:
Disclosed is a self-diagnosis apparatus in a fuel evaporation gas scattering preventing system in an internal combustion engine. The apparatus comprises: a canister communicating with a fuel tank and containing therein an absorption material adapted to absorb a fuel evaporation gas in the fuel tank; a discharge path for making the canister communicate with a suction path of an internal combustion engine; an opening/closing device provided in the discharge path for opening/closing the discharge path; an air-fuel ratio detector for detecting an air-fuel ratio of an air-fuel mixture fed to the internal combustion engine; a gas generation quantity detector for detecting a quantity of generation of fuel evaporation gas within the fuel tank; judgment device for controlling the opening/closing device to close/open the discharge path to thereby judge whether abnormality exists or not on the basis of a change in the air-fuel ratio detected by the air-fuel ratio detector upon closing/opening discharge path, when the gas generation quantity detector detects that gas is being generated within the fuel tank; and a warning device for generating a warning when the judgment device proves existence of abnormality.

REFERENCES:
patent: 4646702 (1987-03-01), Matsubara et al.
patent: 4741318 (1988-05-01), Kortge et al.
patent: 4841940 (1989-06-01), Uranishi et al.
patent: 4865000 (1989-09-01), Yajima
patent: 4867126 (1989-09-01), Yonekawa et al.
Patent Abstracts of Japan, vol. 12, No. 195 (M-705) (3042) Jun. 7, 1988 & JP-A-63 001 753, Jan. 1988 English Abstract only.

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