Fluid operated pump displacement control system

Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control

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Details

60449, 60452, 417218, 417222, F04B 4900

Patent

active

046003649

ABSTRACT:
A control system for a variable displacement pump or pumps driven by a vehicular engine for supplying pressurized fluid to implement actuators via implement control valves. The engine has several output conditions each with a different output torque characteristic. The control system includes a servomechanism comprising a servoactuator section coupled to the pump for varying the per cycle displacement thereof, a servovalve section for operating the servoactuator section by fluid pressure from a fixed displacement pump, and a control section for actuating the servovalve section. The servomechanism control section is fluid operated from a torque control valve, which delivers a controlled degree of fluid pressure from the fixed displacement pump to the control section in order to correspondingly vary the torque requirement of the variable displacement pump. The torque control valve is solenoid operated from a controller in association with a sensor capable of sensing each output condition in which the engine operates, in such a way that the torque requirement of the pump is controlled to suit the sensed output condition of the engine. The servomechanism control section is further under the control of a drain sensor effective to control the pump displacement in accordance with the flow rate of the fluid being drained from the implement control valves.

REFERENCES:
patent: 3732036 (1973-05-01), Busbey et al.
patent: 3820920 (1974-06-01), Klimaszewski et al.
patent: 3875849 (1975-04-01), Patel
patent: 3891354 (1975-06-01), Bosch
patent: 4157233 (1979-06-01), Horiuchi
patent: 4420937 (1983-12-01), Naruse et al.
patent: 4478136 (1984-10-01), Heiser et al.

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