FUEL OXIDATION REDUCTION FOR HYBRID VEHICLES
First Claim
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1. A method, comprising:
- when fuel tank pressure is below a threshold, routing fuel vapors from a fuel system canister to the fuel tank to maintain the fuel tank pressure at a desired pressure.
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Abstract
Systems and methods to control fuel tank pressure to reduce fuel oxidation in plug-in hybrid electric vehicles are disclosed. A method comprises routing vapors from a fuel system canister to the fuel tank to maintain the fuel tank pressure at a desired pressure. In this way, the engine may be maintained off for greater durations while still retaining fuel quality of fuel stored on-board the vehicle.
54 Citations
20 Claims
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1. A method, comprising:
when fuel tank pressure is below a threshold, routing fuel vapors from a fuel system canister to the fuel tank to maintain the fuel tank pressure at a desired pressure. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system, comprising:
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a fuel tank; a pressure sensor to sense vapor pressure within the fuel tank; a vapor canister; a vapor line between the fuel tank and the vapor canister; and a pump located in the vapor line. - View Dependent Claims (8, 9, 10, 11, 12, 13, 15)
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14. The system of 7, wherein the fuel tank can withstand a 45 kpa positive pressure and a 21 kpa negative pressure.
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16. A system, comprising:
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a fuel tank; a pressure sensor to sense vapor pressure within the fuel tank; a vapor canister; a vapor line between the fuel tank and the vapor canister; and a diverter valve. - View Dependent Claims (17, 18, 19, 20)
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Specification