Fault diagnostic apparatus for evaporated fuel purging system

Details Fault diagnostic apparatus for evaporated fuel purging system Fault diagnostic apparatus for evaporated fuel purging system

1996-03-27

1997-10-21

Dombroske, George M.

Measuring and testing

Simulating operating condition

Marine

73 405R, 73 497, 73115, 73116, 123519, F02M 2508, F02B 7708, G01M 1500

Patent

active

056798903

ABSTRACT:
The fault diagnostic apparatus of the present invention detects a failure (a leak) of a fuel tank of an engine. In this invention, space above the fuel level in the fuel tank is connected to a canister. The canister contains an adsorbent to adsorb evaporated fuel in the tank to prevent the evaporated fuel from being released to the atmosphere. Valves are provided to the canister to keep the internal pressure of the canister within a predetermined range. A control circuit of the engine employs a pressure sensor to monitor the internal pressure of the fuel tank, and determines whether the fuel tank has failed in accordance with a change in the internal pressure of the fuel tank. Since the change in the fuel level in the fuel tank varies in accordance with the fuel consumption rate, the change in the pressure in the fuel tank also varies in accordance with the fuel consumption rate. Therefore, the control circuit stops the determining operation when the fuel consumption rate of the engine is too large or too small, to avoid an error in the diagnosis of the fuel tank.

REFERENCES:
patent: 5267470 (1993-12-01), Cook
patent: 5275144 (1994-01-01), Gross
patent: 5284050 (1994-02-01), Iida et al.
patent: 5327776 (1994-07-01), Yasui et al.
patent: 5408866 (1995-04-01), Kawamura et al.
patent: 5425266 (1995-06-01), Fournier
patent: 5526675 (1996-06-01), Ratton

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