Fuel vapor processing system

Details Fuel vapor processing system Fuel vapor processing system

2005-10-04

2005-10-04

Moulis, Thomas (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

C137S512200, C137S587000

Reexamination Certificate

active

06951209

ABSTRACT:
In a fuel vapor processing system, a float valve and a check valve are provided in upper parts of a fuel tank to conduct fuel vapor to a canister via a fuel vapor passage. The check valve includes a low set-pressure valve and high set-pressure valve, and operates in two stages so that the internal pressure of the fuel tank can be favorably controlled by the opening of the low set-pressure valve when the fuel tank is being filled to full so that the sensor associated with the fill nozzle can successfully detect a tank full state, and any excessive rise in the internal pressure of the fuel tank typically caused by a high temperature of the surrounding environment can be avoided by the opening of the high set-pressure valve.

REFERENCES:
patent: 5590697 (1997-01-01), Benjey et al.
patent: 5640993 (1997-06-01), Kasugai et al.
patent: 5769057 (1998-06-01), Hashimoto et al.
patent: 5782258 (1998-07-01), Herbon et al.
patent: 6405747 (2002-06-01), King et al.
patent: 6655403 (2003-12-01), Mills

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