Method and system for aggressive cycling of leak detection pump to ascertain vapor leak size

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United States of America Patent

PATENT NO 6282945
SERIAL NO

09465030

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Abstract

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A system and method for detecting leakage from a evaporative emission space of an automotive vehicle fuel system. A reciprocating pump is operated in a pressurizing mode to build pressure in the space toward a nominal test pressure. The pressurizing mode involves operating the pump in a repeating cycle wherein the pump operates alternately in an accelerated pumping mode and a natural frequency pumping mode. During the pressurizing mode, a characteristic of successive occurrences of the natural frequency pumping mode indicative of pressure in the space is measured. The number of times the cycle repeats is counted and compared to a predefined reference. When the cycle count exceeds the predefined reference, the test continues at a lower resolution for detecting leakage, and when the cycle count does not exceed the predefined reference and a measurement of the characteristic of successive occurrences of the natural frequency pumping mode indicative of pressure in the space exceeds a predetermined reference pressure, the test continues at a higher resolution for detecting leakage. The invention is useful when overall test time is limited.

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Patent Owner(s)

Patent OwnerAddress
SIEMENS CANADA LIMITED2185 DERRY ROAD WEST MISSISSAUGA ONTARIO L5N 7

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cook, John Edward Chatham, CA 23 320
Rasokas, Ray Thamesville, CA 5 47
Weldon, Craig Chatham, CA 14 178

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