Dynamic pressure correction in engine off natural vacuum system
AssigneeGeneral Motors Corporation
InventorsKurt Mc Lain, Michael Pitsch
Life of this patent
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Abstract
A leak detection system for a vehicle fuel tank includes a sensor that is responsive to a pressure within the fuel tank and that generates a pressure signal based thereon. A control module initiates an engine-off natural vacuum (EONV) test and determines a pressure change based on the pressure signal. The control module pauses the EONV test when the pressure change exceeds a pressure change threshold.
Claims23
A leak detection system for a vehicle fuel tank, comprising:
- a sensor senses pressure within said fuel tank and that generates a pressure signal based thereon;
- and
- a control module that initiates an engine-off natural vacuum (EONV) test, that determines a pressure change based on said pressure signal, that pauses said EONV test when said pressure change exceeds a pressure change threshold, and that resumes said EONV test when said pressure change is below said pressure change threshold.
(canceled)
A method of monitoring abortive pressure changes during leak detection for a vehicle fuel tank, comprising:
- generating a pressure signal based on a pressure within said fuel tank;
- initiating an engine-off natural vacuum (EONV) test;
- determining a pressure change based on said pressure signal;
- pausing said EONV test when said pressure change exceeds a pressure change threshold;
- and
- resuming said EONV test when said pressure change is below said pressure change threshold.
(canceled)
A method of monitoring abortive pressure changes during leak detection for a vehicle fuel tank, comprising:
- generating a pressure signal based on a pressure within said fuel tank;
- initiating an engine-off natural vacuum (EONV) test;
- determining a pressure change based on said pressure signal;
- and
- pausing said EONV test and initiating a test abort timer when said pressure change exceeds a pressure change threshold.
Dependencies are inferred from the claim text.