| 摘要 |
A fuel system for supplying fuel to an internal combustion engine. The fuel system includes a fuel tank, an intake manifold, a fuel vapor collection canister, a purge valve, and a fuel vapor pressure management apparatus. The purge is in fluid communication with the intake manifold and is in fluid communication with the fuel vapor collection canister. The fuel vapor pressure management apparatus includes a housing, a pressure operable device, and a switch. The housing is coupled to the fuel vapor collection canister and defines an interior chamber. The pressure operable device separates the interior chamber into a first portion that is in fluid communication with the fuel vapor collection canister, and a second portion that is in fluid communication with a vent port. The pressure operable device includes a poppet that is movable along an axis, and a seal that is adapted to cooperatively engage the poppet. A first arrangement of the pressure operable device occurs when there is a first negative pressure level in the fuel vapor collection canister relative to the vent port, and the seal is in a first deformed configuration. A second arrangement of the pressure operable device permits a first fluid flow from the vent port to the fuel vapor collection canister when the seal is in a second deformed configuration. And a third arrangement of the pressure operable device permits a second fluid flow from the fuel vapor collection canister to the vent port when the seal is in an undeformed configuration. The switch signals the first arrangement of the pressure operable device.
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