Ventilation device for the fuel system of a hybrid vehicle

摘要

A ventilation device including: a first enclosure including a first passage configured to be connected to a canister outlet and the atmosphere, and a normally closed shutter device configured to open to release the first passage; a second enclosure including a second passage configured to be connected to the canister inlet and a fuel tank, and a normally open shutter device configured to close to shut the second passage, the second passage being separate from and not in communication with the first passage; and a combined pressure/vacuum relief valve or OPR and UPR valve pair situated in or fastened to a bypass of the first passage configured to establish a connection between ends of the first passage when the shutter device is closed and when there is over- or under-pressure in the ends. A fuel system can include the device and a hybrid vehicle can include the fuel system.

主权项

1. A ventilation device comprising:
a first enclosure including a first passage configured to be connected respectively to an outlet of a canister and to an atmosphere, and a normally closed shutter device configured to open to release the first passage; a second enclosure including a second passage configured to be connected to an inlet of the canister and to a fuel tank, and a normally open shutter device configured to close to shut the second passage, the second passage being separate from the first passage and not being in communication therewith inside the device; and a combined pressure/vacuum relief valve or an OPR and UPR valve pair situated in or fastened to a bypass of the first passage configured to establish a connection between ends of the first passage when the shutter device is closed and when there is over-pressure or under-pressure from end to end of the first passage.