Fault diagnostic method and apparatus for fuel evaporative emiss

Details Fault diagnostic method and apparatus for fuel evaporative emiss Fault diagnostic method and apparatus for fuel evaporative emiss

1996-07-18

1998-05-12

Dombroske, George M.

Measuring and testing

Simulating operating condition

Marine

73 497, F02M 2508, G01M 1500

Patent

active

057508887

ABSTRACT:
A method and apparatus for detecting faults in a fuel evaporative emission control system, in which the fuel evaporative emission which is admitted from a fuel tank and adsorbed once by a canister is separated from the canister by purge air and sucked into a suction passage of an engine. The fault diagnostic apparatus fluid-tightly closes the fuel tank such that a vacuum is held in the fuel tank, and then detect the presence of a leak in a fuel evaporative emission flow path on the basis of a rate of increase of the pressure in the fuel tank. At the same time, the average value of the pressure in the fuel tank is calculated at regular intervals, and the calculated average value is compared with levels of the pressure in the tank detected within a predetermined period of time, so that the detection of the leak is interrupted depending upon the result of the comparison.

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