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US 8,739,766 B2Granted
Method and system for fuel vapor control
AssigneeFord Global Technologies, LLC
InventorsRobert Roy Jentz, Mark W. Peters, Ann Irene DeZelia, Aed Mohammad Dudar
Life of this patent
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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.
Claims20
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.
A method for a vehicle engine, comprising:
- 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.
1 more element
A vehicle system, comprising:
- 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.
8 more elements
Dependencies are inferred from the claim text.