Method and apparatus to monitor operation of an auxiliary hydraulic pump in a transmission
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United States of America Patent
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Jun 9, 2009
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N/A
app pub date -
Sep 13, 2006
filing date -
Sep 13, 2006
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Abstract
A method and apparatus to monitor operation of an electrically-actuated hydraulic pump selectively operative to supply pressurized fluid to a hydraulic circuit for a transmission device operably connected to an internal combustion engine of a vehicle includes monitoring vehicle operation and passively and intrusively monitoring hydraulic circuit pressure. The hydraulic pump is functioning properly when the monitored pressure in the hydraulic circuit exceeds a threshold. A fault related to the hydraulic circuit is identified when the monitored pressure in the hydraulic circuit does not exceed the threshold.
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