Power control for a hydrostatic transmission
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United States of America Patent
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May 24, 1988
Issued Date -
N/A
app pub date -
Oct 6, 1987
filing date -
Aug 22, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to a power control for an automatic transmission which consists of two valves, the first of which is a characteristic valve providing a pressure differential linearly proportional to an input speed signal provided by a prime mover driven fixed displacement pump, and a second valve which is modulated by the pressure differential generated by the first valve and by a pressure feedback proportional to the torque transmitted by the transmission. The power control provides a series of linear control curves proportional to input speed and is useful as either an automotive type control or an anti-stall control, or a combination of both.
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