METHOD AND SYSTEM FOR FUEL VAPOR CONTROL
First Claim
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1. A method for a vehicle engine, comprising:
- during a first key-on condition, spinning the engine fueled and storing fuel tank vapors in a first, larger canister; and
during a second key-off condition, spinning the engine unfueled and storing fuel tank vapors in a second, smaller canister.
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Abstract
Methods and systems are provided for operating an engine to generate vacuum for a subsequent leak detection routine. During a selected key-off condition, a starter motor is operated to spin the engine unfueled and generate intake vacuum for the leak detection. Fuel vapors drawn during the spinning are stored in an auxiliary canister that is purged along with a main canister during purging conditions.
65 Citations
20 Claims
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1. A method for a vehicle engine, comprising:
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during a first key-on condition, spinning the engine fueled and storing fuel tank vapors in a first, larger canister; and during a second key-off condition, spinning the engine unfueled and storing fuel tank vapors in a second, smaller canister. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for a vehicle engine, comprising:
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during a key-off condition, operating a starter motor to spin the engine unfueled; and storing fuel vapors drawn from a fuel tank during the spinning in a first canister coupled between the fuel tank and an engine intake manifold. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A vehicle system, comprising:
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an engine including an intake manifold; a battery-operated starter motor coupled to the engine; a fuel tank; a first, larger canister coupled to the intake manifold upstream of the fuel tank; a second, smaller canister coupled to the intake manifold downstream of the fuel tank; and a control system with computer readable instructions for, during a key-off condition, spinning the engine with starter motor assistance with no air or fuel injected into the engine; and storing fuel vapors drawn from the fuel tank during the spinning in the second canister. - View Dependent Claims (17, 18, 19, 20)
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Specification