METHOD AND APPARATUS FOR DETECTING A LEAK IN A FUEL DELIVERY SYSTEM
First Claim
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1. A leak detection system for a fuel delivery system including a fuel line, the leak detection system comprising:
- a sensor coupled to the fuel line;
a controller coupled to the sensor and configured to perform a plurality of leak tests on the fuel line between periods of fuel delivery based on an output of the sensor, each respective leak test producing test data used by the controller to determine a measure of a leak rate of the fuel line during the respective test interval, the controller determining the presence of a leak in the fuel line based on the measures of the leak rates for at least a portion of the plurality of leak tests, a first leak test of the portion occurring prior to a first fuel delivery event and a second leak test of the portion occurring subsequent to the first fueling event.
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Abstract
A leak detection system is provided for detecting a leak in a fuel line. A controller determines the presence of a leak in the fuel line based on an analysis of data obtained from individual leak tests performed on the fuel line, the individual leak tests may span one or more fuel delivery events.
111 Citations
36 Claims
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1. A leak detection system for a fuel delivery system including a fuel line, the leak detection system comprising:
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a sensor coupled to the fuel line; a controller coupled to the sensor and configured to perform a plurality of leak tests on the fuel line between periods of fuel delivery based on an output of the sensor, each respective leak test producing test data used by the controller to determine a measure of a leak rate of the fuel line during the respective test interval, the controller determining the presence of a leak in the fuel line based on the measures of the leak rates for at least a portion of the plurality of leak tests, a first leak test of the portion occurring prior to a first fuel delivery event and a second leak test of the portion occurring subsequent to the first fueling event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of detecting a leak in a fuel delivery system including a fuel line, the method comprising the steps of:
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monitoring a pressure in the fuel line while fuel is not being dispensed by the fuel delivery system during a plurality of test intervals, the plurality of test intervals spanning at least one fuel delivery event by the fuel delivery system; determining with an electronic controller for each test interval a measure of the leak rate of the fuel line during the respective test interval; and determining with the electronic controller based on the measures for the plurality of respective test periods if the fuel line of the fuel delivery system includes a leak greater than a threshold amount. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification