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A fuel control system includes a valve assembly disposed between a fuel tank with a filler tube and a fuel vapor storage canister. The valve assembly includes a housing having a vapor inlet port for establishing communication with the fuel tank at a level above the full level of fuel contained in th

A fuel control system includes a valve assembly disposed between a fuel tank with a filler tube and a fuel vapor storage canister. The valve assembly includes a housing having a vapor inlet port for establishing communication with the fuel tank at a level above the full level of fuel contained in the fuel tank, and a vent inlet port for establishing communication with the fuel tank until the full level is reached by fuel contained in the fuel tank. An outlet port is provided for establishing communication with the canister. A conduit is provided for transmiting signal pressure for establishing communication with the filler tube at a level above the fuel level of fuel in the filler tube. First and second check valves are mounted within the housing and respectively include valve seats, valve elements, springs and diaphragms. The diaphragms cooperate with the housing to define a signal pressure chamber communicating with the conduit. The first diaphragm acts on the first valve element against the action of the first spring in response to a difference between the pressure within the signal pressure chamber and the reference pressure. The second diaphragm acts on the second valve element in a direction assisting the action of the second spring in response to a difference between the pressure within the signal pressure chamber and the pressure at the outlet port.

대표청구항 ▼

A valve assembly for controlling a flow of fuel vapor discharged from a fuel tank to a fuel vapor storage canister, the fuel tank having a filler tube through which fuel is fed to the fuel tank, the valve assembly comprising: a housing having inlet port means adapted for establishing communication w

A valve assembly for controlling a flow of fuel vapor discharged from a fuel tank to a fuel vapor storage canister, the fuel tank having a filler tube through which fuel is fed to the fuel tank, the valve assembly comprising: a housing having inlet port means adapted for establishing communication with the fuel tank at a level above the full level of fuel contained in the fuel tank, and outlet port means adapted for establishing communication with the fuel vapor storage canister; said housing also having signal pressure port means adapted for establishing a communication with the filler tube at a level above the fuel level of fuel contained in the filler tube; a check valve mounted within said housing and fluidly disposed between said inlet port means and said outlet port means, said check valve including a valve seat communicating with said first inlet port means and a valve element cooperating with said first valve seat; and biasing means mounted within said housing for biasing said valve element toward said valve seat, said biasing means including a spring acting on and biasing said valve element toward said valve seat and a diaphragm; said diaphragm cooperating with said housing to define within said housing a signal pressure chamber communicating with said signal pressure port means; said diaphragm having one side exposed to a reference pressure as high as the ambient atmosphere and the opposite side exposed to a pressure within said signal pressure chamber, said diaphragm acting on and biasing said valve element against the action of said spring in response to a difference between said pressure within said signal pressure chamber and said reference pressure.