CONTROL SYSTEM FOR CONSTRUCTION MACHINE
First Claim
1. A control system for a construction machine, comprising:
- a boom cylinder partitioned into a piston side chamber and a rod side chamber by a piston, the boom cylinder operating so as to be extended and contracted by supplying a working fluid to the piston side chamber or the rod side chamber, thereby driving a boom;
a boom switching valve adapted to adjust a supply amount of the working fluid to be supplied to the piston side chamber or the rod side chamber by means of a stroke of a spool;
a fluid pressure motor adapted to drive a motor generator by being rotated by means of a return fluid guided from the piston side chamber;
a regeneration control valve adapted to communicate the piston side chamber with the boom switching valve and the fluid pressure motor, the regeneration control valve being adapted to adjust a first supply amount and a second supply amount, the first supply amount serving as a supply amount of the working fluid supplied from the piston side chamber to the boom switching valve, the second supply amount serving as a supply amount of the working fluid supplied from the piston side chamber to the fluid pressure motor; and
a controller adapted to control the regeneration control valve so that the second supply amount becomes smaller than the first supply amount in a case where a stroke amount of the spool becomes an upper limit value or more.
2 Assignments
0 Petitions
Accused Products
Abstract
A control system for a construction machine includes: a boom cylinder; a boom switching valve; a fluid pressure motor adapted to drive a motor generator by being rotated by means of a return fluid guided from a piston side chamber; a regeneration control valve adapted to adjust a first supply amount serving as a supply amount of a working fluid supplied from the piston side chamber to the boom switching valve, and a second supply amount serving as a supply amount of the working fluid supplied from the piston side chamber to the fluid pressure motor; and a controller adapted to control the regeneration control valve so that the second supply amount becomes smaller than the first supply amount in a case where a stroke amount of a spool becomes an upper limit value or more.
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Citations
5 Claims
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1. A control system for a construction machine, comprising:
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a boom cylinder partitioned into a piston side chamber and a rod side chamber by a piston, the boom cylinder operating so as to be extended and contracted by supplying a working fluid to the piston side chamber or the rod side chamber, thereby driving a boom; a boom switching valve adapted to adjust a supply amount of the working fluid to be supplied to the piston side chamber or the rod side chamber by means of a stroke of a spool; a fluid pressure motor adapted to drive a motor generator by being rotated by means of a return fluid guided from the piston side chamber; a regeneration control valve adapted to communicate the piston side chamber with the boom switching valve and the fluid pressure motor, the regeneration control valve being adapted to adjust a first supply amount and a second supply amount, the first supply amount serving as a supply amount of the working fluid supplied from the piston side chamber to the boom switching valve, the second supply amount serving as a supply amount of the working fluid supplied from the piston side chamber to the fluid pressure motor; and a controller adapted to control the regeneration control valve so that the second supply amount becomes smaller than the first supply amount in a case where a stroke amount of the spool becomes an upper limit value or more. - View Dependent Claims (3, 4, 5)
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2. A control system for a construction machine, comprising:
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a boom cylinder in which a piston side chamber and a rod side chamber are formed by a piston, the boom cylinder operating so as to be extended and contracted by supplying a working fluid to the piston side chamber or the rod side chamber, thereby driving a boom; a boom switching valve adapted to adjust a supply amount of the working fluid to be supplied to the piston side chamber or the rod side chamber by means of a stroke of a spool; a fluid pressure motor adapted to drive a motor generator by being rotated by means of a return fluid guided from the piston side chamber; a regeneration control valve adapted to communicate the piston side chamber with the boom switching valve and the fluid pressure motor, the regeneration control valve being adapted to adjust a supply amount of the working fluid supplied from the piston side chamber to the boom switching valve and a supply amount of the working fluid supplied from the piston side chamber to the fluid pressure motor; a bleed-off valve provided on a passage connecting the regeneration control valve to the fluid pressure motor, the bleed-off valve communicating or blocking between the piston side chamber and a tank at a drain side; and a controller adapted to, in a case where a stroke amount of the spool becomes an upper limit value or more, control an opening degree of the bleed-off valve in accordance with the stroke amount to communicate the piston side chamber with the tank.
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Specification