Fuel vapor treatment system

Details Fuel vapor treatment system Fuel vapor treatment system

2005-03-08

2005-03-08

Lo, Weilun (Department: 3747)

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

C123S519000, C123S520000, C123S494000, C123S677000

Reexamination Certificate

active

06863057

ABSTRACT:
A fuel vapor treatment system is provided that diagnoses failure of the purge valve using one absolute pressure sensor. The fuel vapor treatment system includes a fuel tank, a canister, a drain cut valve, a purge valve, purge piping and a sensor. The canister adsorbs fuel vapor evaporated from the fuel tank. The drain cut valve controls the introduction of air into the canister. The purge valve is disposed between the canister and an intake passage into which fuel vapor flows from the canister. The purge piping communicates between the fuel tank and the intake passage via the canister. The sensor detects the absolute pressure inside the purge piping. The fuel vapor treatment system is further equipped with an atmospheric pressure setting device that sets the value detected by the sensor when the drain cut valve is open as the atmospheric pressure used for controlling the engine.

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