Constant speed hydrostatic drive system

Details Constant speed hydrostatic drive system Constant speed hydrostatic drive system

1982-12-10

1989-11-07

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

290 40R, G05D 1600

Patent

active

048795011

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.

REFERENCES:
patent: 2916635 (1959-12-01), Nicita
patent: 3247717 (1966-04-01), Kemmer
patent: 3564273 (1971-02-01), Cockrell
patent: 3612975 (1971-10-01), Keefe
patent: 3796939 (1974-03-01), Raggi
patent: 3798907 (1974-03-01), Barrett
patent: 3810251 (1974-05-01), Blanyer
patent: 3886921 (1975-06-01), Hafner
patent: 3987624 (1976-10-01), Cooke
patent: 4053786 (1977-10-01), Jones
patent: 4245162 (1981-01-01), Rennen
patent: 4270055 (1981-05-01), Ronnen
patent: 4425758 (1984-01-01), Schexnaydel

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