Testing apparatus for fuel vapor treating device

Details Testing apparatus for fuel vapor treating device Testing apparatus for fuel vapor treating device

1997-07-15

1999-01-12

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

F02M 3304

Patent

active

058574476

ABSTRACT:
An apparatus for testing seal of a fuel vapor treating device that collects fuel vapor generated in a fuel tank and treats the vapor without releasing it into the atmosphere. The treating device is provided with a canister that collects the fuel vapor through a vapor line. A vapor control valve connected to the canister adjusts the flow of fuel vapor directed toward the canister from the tank. A pressure sensor is provide to detect the pressure in the tank. An electronic control unit (ECU) controls the purge control valve and the three-way valve. The ECU counts the number of deviations of the detected pressure when the detected pressure is within a predetermined range. The ECU determines whether the seal is normal or malfunctioning based on the detected pressure when the counted value is smaller than a predetermined value.

REFERENCES:
patent: 5295472 (1994-03-01), Otsuka et al.
patent: 5317909 (1994-06-01), Yamada et al.
patent: 5425344 (1995-06-01), Otsuka et al.
patent: 5671718 (1997-09-01), Curran et al.
patent: 5690076 (1997-11-01), Hashimoto et al.
U.S. Patent application No. 08/624,009.

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