Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1984-08-10
1990-05-01
Michalsky, Gerald A.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60444, 60449, F16H 3950
Patent
active
049207482
ABSTRACT:
The torque of a hydraulic machine is dependent of the fluid pressure delivered to the machine and is further dependent of the adjustment of its volume of through-put. In response to a load coupled to the machine, a speed results which is controlled by a speed control system acting on the adjusting system of the hydraulic machine. According to the invention, an electro hydraulic speed control comprises a pair of control circuits which are connected to, but operate independent of each other. Thus the electrical control circuit produces a control signal y.sub.e1 from the difference of the actual value and the desired value of the speed for adjusting a hydraulic restricting means which produces a hydraulic pressure signal p.sub.st in the hydraulic control circuit which pressure signal is compared with a hydraulic reference signal p.sub.o to produce a differential pressure signal p.sub.o -p.sub.st which is applied to the adjusting cylinder of the hydraulic machine. The control system thus comprises two circuits, i.e. an electrical speed control circuit and a hydraulic pressure control circuit resulting in optimizing the control operation.
REFERENCES:
patent: 4168612 (1979-09-01), Nikolaus
patent: 4461147 (1984-07-01), Myers
"Olhydraulik und Pneumatik" 26 (1982), No. 2, pp. 74-82.
Kordak Rolf
Metzner Frank
Nikolaus Heinrich
Mannesmann Rexroth GmbH
Michalsky Gerald A.
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