Apparatus for checking failure in evaporated fuel purging unit

Details Apparatus for checking failure in evaporated fuel purging unit Apparatus for checking failure in evaporated fuel purging unit

1991-03-22

1992-04-21

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 2508

Patent

active

051057891

ABSTRACT:
A failure checking apparatus for use with an internal combustion engine associated with an evaporated fuel purging unit having a canister adapted to accumulate evaporated fuel from a fuel tank. Communication is provided between the canister and the engine to introduce the evaporated fuel from the canister to the engine. The communication is interrupted to permit the canister to accumulate evaporated fuel from the fuel tank when a parameter related to a rate of evaporated fuel produced in the fuel tank exceeds a predetermined value. The communication is introduced into the canister and resumed to permit evaporated fuel to be introduced from the canister to the engine a predetermined period of time after the communication is interrupted. An air/fuel ratio at which the engine is operating is sensed for detecting a first value representing the air/fuel ratio when the communication is held interrupted and a second value representing the air/fuel ratio after the communication is resumed. A failure signal is produced, based upon a difference between the first and second air/fuel ratio values, to indicate that a failure occurs in the evaporated fuel purging unit.

REFERENCES:
patent: 4677956 (1987-07-01), Hamborg
patent: 4741318 (1988-05-01), Kortge
patent: 4763634 (1988-08-01), Morozumi
patent: 4821701 (1989-04-01), Nankee
patent: 4862856 (1989-09-01), Yokoe
patent: 4865000 (1989-09-01), Yatima
patent: 4867126 (1989-09-01), Yonekawa
patent: 4926825 (1990-05-01), Ohtaka
patent: 4932386 (1990-06-01), Uozami
patent: 4949695 (1990-08-01), Uranishi
patent: 4962744 (1990-10-01), Uranishi

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