FUEL SEPARATION SYSTEM FOR REDUCING PARASITIC LOSSES

摘要

Systems and methods for separating higher octane fuel from a fuel mixture are presented. In one example, higher octane fuel is separated from lower octane fuel and allowed to condense in a fuel tank holding higher octane fuel so that parasitic engine losses are not increased by having to separate higher octane fuel from lower octane fuel a second time. The approach may be applied to fuel systems that include multiple fuel tanks storing different types of fuel.

主权项

1. A method for operating an engine, comprising:
separating higher octane fuel vapors from a first lower octane fuel; storing the separated fuel vapors in a first fuel vapor storage canister; and limiting the separated fuel vapors from entering a second fuel tank holding the first lower octane fuel while not limiting the separated fuel vapors from entering a first fuel tank holding a higher octane fuel.