METHOD AND SYSTEM FOR ADJUSTING A FUEL TANK ISOLATION VALVE
First Claim
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1. An engine method, comprising:
- adjusting a fuel tank isolation valve (FTIV) of a fuel system by sending an electrical pulse to the FTIV; and
comparing a current draw of the FTIV to a known current draw profile to verify the position of the FTIV.
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Abstract
Methods and systems are provided for adjusting and diagnosing a position of a fuel tank isolation valve (FTIV) of a fuel system. In one example, a method comprises adjusting a FTIV of a fuel system by sending an electrical pulse to the FTIV; and comparing a current draw of the FTIV to a known current draw profile to verify the position of the FTIV. In this way, the position of the FTIV may be diagnosed, thereby resulting in increased accuracy of subsequent valve control.
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Citations
20 Claims
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1. An engine method, comprising:
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adjusting a fuel tank isolation valve (FTIV) of a fuel system by sending an electrical pulse to the FTIV; and comparing a current draw of the FTIV to a known current draw profile to verify the position of the FTIV. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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adjusting a fuel tank isolation valve (FTIV) of a fuel system by sending electrical pulses to the FTIV; counting each of the electrical pulses to track a position of the FTIV; and using a canister temperature to verify the position of the FTIV when the position of the FTIV is unknown or invalid. - View Dependent Claims (14, 15, 16)
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17. A fuel system, comprising:
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an engine; a fuel tank; a canister for storing fuel vapors; a fuel tank isolation valve (FTIV) coupled in a vapor line between the fuel tank and the canister, the FTIV held in both opened and closed positions without any applied current; and a controller with computer readable instructions for diagnosing a position of the FTIV and subsequently adjusting the FTIV based on the diagnosed position and engine operating conditions. - View Dependent Claims (18, 19, 20)
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Specification