Stator current based malfunction detecting system in a variable flow delivery pump
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United States of America Patent
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Apr 13, 1993
Grant Date -
N/A
app pub date -
Feb 19, 1991
filing date -
Feb 19, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The current invention detects malfunctions in a variable flow delivery pump. These malfunctions prevent the pump from sustaining inherently high accuracy and/or cause damages to the pump. The invention detects the malfunctions without comparing sampled values to a preset absolute value. A malfunction is determined by a pattern of force exerted on a displacement pump in relation to the displacement positions. The pattern is compared to an empirically established range of pattern values. Once a malfunction is determined, the invention responds in a preselected manner.
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