Constant speed hydrostatic drive system
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United States of America Patent
Stats
-
Nov 7, 1989
Grant Date -
N/A
app pub date -
Dec 10, 1982
filing date -
Dec 10, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A constant speed hydrostatic drive system is disclosed wherein a generator drive shaft is maintained at a constant speed by utilizing an electro-hydraulic controlled displacement pump responsive to a pressure transducer to control a hydraulic motor. A speed sensor is used to produce a direct current signal responsive to the drive shaft speed. The signal is converted into a series of voltage pulses also responsive to the shaft speed which are compared to a speed reference signal to provide a speed error signal. A loop gain control means is provided to utilize said speed error signal to adjust the shaft speed to coincide with said reference signal. A timing reference and digital trim control are also provided to compensate for long term drifting in the type speed control circuit described above.
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