ENGINE-OFF LEAK DETECTION BASED ON PRESSURE
First Claim
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1. A method for a vehicle with an engine, comprising:
- in response to a pressure change in a fuel tank less than a threshold for a duration during engine-off conditions while the tank is sealed off from atmosphere, indicating a leak condition; and
in response to a pressure change in the tank greater than the threshold during engine-off conditions while the tank is sealed off from atmosphere, indicating a no-leak condition.
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Abstract
Methods and systems for fuel system leak detection are disclosed. In one example approach, a method comprises, in response to a pressure change in a fuel tank less than a threshold for a duration during engine-off conditions while the tank is sealed off from atmosphere, indicating a leak condition, and in response to a pressure change in the tank greater than the threshold during engine-off conditions while the tank is sealed off from atmosphere, indicating a no-leak condition.
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Citations
20 Claims
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1. A method for a vehicle with an engine, comprising:
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in response to a pressure change in a fuel tank less than a threshold for a duration during engine-off conditions while the tank is sealed off from atmosphere, indicating a leak condition; and in response to a pressure change in the tank greater than the threshold during engine-off conditions while the tank is sealed off from atmosphere, indicating a no-leak condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for a hybrid electric vehicle with an engine, comprising:
during engine-off conditions while a fuel tank is sealed off from an engine intake and any other gas port, indicating a leak in response to a pressure change in the fuel tank less than a threshold for a duration. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for a hybrid electric vehicle with an engine, comprising:
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during engine-off conditions while a fuel tank is sealed off from an engine intake, atmosphere, and any other gas port, indicating a leak in response to a pressure change in the fuel tank less than a threshold for a duration, where the duration is a time duration during which temperature of the fuel tank changes by a threshold amount; and during engine-off conditions while the fuel tank is sealed off from the engine intake and any other gas port, indicating a no-leak condition in response to a pressure change in the fuel tank greater than the threshold. - View Dependent Claims (18, 19, 20)
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Specification