| 摘要 |
Onboard refueling vapor recovery canister for a gasoline-powered vehicle including an unequally-divided carbon bed, a vent solenoid, and a high-capacity, self-cleaning vent filter. Integral configuration of the canister reduces its size and also increases the allowable carbon volume over prior art canisters, permitting use of a lower grade carbon at a significant cost savings while meeting all working capacity requirements. The filter box has an air inlet port and contains a high-efficiency filter wrapped around a feature enclosing a solenoid for opening and closing the air flow through the canister. Wrapping the filter increases the available surface area by more than 50% over that of a flat filter. Outward air flow during refueling partially backflushes the filter, thereby extending the useful life of the filter media. The carbon absorber is divided into two sequential beds of unequal length but equal cross-sectional area, which improves the diurnal efficiency performance of the canister relative to known canisters.
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