Hydraulic control system utilizing a plurality of branch passages with differing flow rates
AssigneePioneer Electronic Corporation
InventorsHitoshi Kaneko, Shunichi Ichikawa
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Abstract
A hydraulic control system for controlling an actuator has a cylinder and a piston, and an oil pump. A first passage is communicated with the oil pump, and a second passage is communicated with the cylinder of the actuator. A plurality of branch passages are connected in parallel between the first and second passages, and a valve is provided in each branch passage. The hydraulic control system has a flow rate setting device for operating each valve thereby applying a predetermined quantity of oil to the cylinder of the actuator to shift the piston a desired distance.
Claims4
A hydraulic control system for controlling an actuator having a cylinder and a piston, the hydraulic control system having an oil pump, a first passage communicated with an oil reservoir through the oil pump, a second passage communicated with the cylinder of the actuator, comprising:
- a plurality of branch passages connected in parallel between the first and second passages;
- an electromagnetic valve provided in each branch passage for controlling flow rate of oil passing therethrough;
- means for changing the flow rate in each branch passage;
- detecting means for detecting moving distance of the piston and for producing a digital distance signal representing a detected moving distance;
- flow rate control means responsive to the digital distance signal from the detecting means for producing digital control signals for operating said electromagnetic valves in such a manner that ratios among the flow rates at every branch passage becomes 2.sup.n, thereby moving the piston a desired distance at controlled speeds,
- wherein n equals 0, 1, 2, 3.
Dependencies are inferred from the claim text.