Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control
Patent
1985-03-28
1987-01-20
Casaregola, Louis J.
Pumps
Condition responsive control of drive transmission or pump...
Plural pumps with individual or relative control
417218, 417222, 60444, 60449, 60452, F04B 4900
Patent
active
046377816
ABSTRACT:
A fluid operated pump displacement control system is provided wherein a self pressure is defined as a first control signal, and characterized in that an arbitrary switchable second control signal different from the first control signal is added to the first control signal, and a displacement is adapted to be switched to a displacement corresponding to a value of the second control signal as added to the first control signal. Further, a fluid operated pump displacement control system is provided comprising a control circuit connected to respective displacement control devices of variable displacement pumps and adapted to be operated by discharge pressure fluid from a discrete control pump. A variable torque control valve has a proportional electromagnetic solenoid provided in a circuit connecting the control circuit with the control pump and is adapted to produce a pressure reduction by a discharge fluid pressure of the variable displacement pumps and a propelling force of the proportional electromagnetic solenoid. A detector detects set output conditions of a prime mover for driving the variable displacement pumps, and current is supplied to the proportional electromagnetic solenoid according to the difference between a set reference rotational speed in each of the set output conditions and an actual rotational speed of the prime mover.
REFERENCES:
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patent: 4498847 (1985-02-01), Akiyama
Akiyama Teruo
Saigo Takaichi
Sasaki Katsuyuki
Casaregola Louis J.
Kabushiki Kaisha Komatsu Seisakusho
Neils Paul F.
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