Method for detecting liquefied fuel in canister purge line of vehicle
First Claim
1. A method of detecting whether liquefied fuel exists in a canister purge line of a vehicle, comprising:
- measuring a fuel level in a fuel tank;
if said fuel level is greater than or equal to a pre-set fuel level, measuring a first air ratio;
opening a purge control valve for a pre-set time after said measuring of said first air ratio;
measuring a second air ratio after said opening of said purge control valve;
subtracting said first air ratio from said second air ratio to obtain a difference; and
if said difference is less than or equal to a pre-set first value and said second air ratio is less than or equal to a pre-set second value, deeming that liquefied fuel exists in said canister purge line.
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Accused Products
Abstract
A method of detecting whether liquefied fuel exists in a canister purge line includes, if a fuel level in a fuel tank is higher than a pre-set level, opening a purge control valve for a time. A difference is calculated between the air-fuel ratio before and after opening the purge control valve. If the difference is less than or equal to a first value and the air-fuel ratio after opening the purge control valve is less than or equal to a second value, then it is deemed that liquefied fuel exists in the canister purge line. If liquefied fuel is deemed to exist in the canister purge line, the purge control valve may be closed for a certain amount of time.
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Citations
10 Claims
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1. A method of detecting whether liquefied fuel exists in a canister purge line of a vehicle, comprising:
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measuring a fuel level in a fuel tank;
if said fuel level is greater than or equal to a pre-set fuel level, measuring a first air ratio;
opening a purge control valve for a pre-set time after said measuring of said first air ratio;
measuring a second air ratio after said opening of said purge control valve;
subtracting said first air ratio from said second air ratio to obtain a difference; and
if said difference is less than or equal to a pre-set first value and said second air ratio is less than or equal to a pre-set second value, deeming that liquefied fuel exists in said canister purge line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification