Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1991-10-07
1994-04-26
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
91375R, F16D 3102
Patent
active
053056043
ABSTRACT:
The present invention is directed to a hydro-mechanical or electro-hydro-mechanical control system utilized for positioning a mechanical device. The control system incorporates an open-center control valve for selectively controlling the differential pressure applied to and the differential flow between input ports of a power output transducer in response to a mechanically applied rotational inputs. The power output transducer is then utilized to position a mechanical device. The control system is a closed loop circuit adapted to supply hydraulic fluid at a desired supply pressure to the control valve. The supply pressure is varied in relation to the absolute value of the pressure differential or load pressure exerted across the input ports of the power output transducer. A pressure regulating apparatus is provided for selectively regulating the supply pressure to a value that is nominally equal to the absolute value of the load pressure summed with a preselected supplemental pressure value across the regulating apparatus. As such, any pressure drop across the control valve is maintained at a nominally constant value which is nominally equal to the difference between the supply pressure and the load pressure. Furthermore, the open-centered control valve is operable for generating a tactile feedback as a function of both the differential output pressure and the differential fluid flow.
REFERENCES:
patent: 3591136 (1971-07-01), Bishop
patent: 4217932 (1980-08-01), Bacardit
patent: 4425759 (1984-01-01), Krusche
patent: 4507920 (1985-04-01), Rau
patent: 4823552 (1989-04-01), Ezell et al.
Look Edward K.
Lopez F. Daniel
Techco Corporation
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