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US 12,352,293 B2Granted
Hydraulic drive system
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsTomomichi Nose, Hayato Kawasaki, Hideyasu Muraoka, Nobuyuki Kinoshita
Life of this patent
Estimating the term…
Abstract
This hydraulic drive system includes: a hydraulic pump that supplies a working fluid to a hydraulic actuator; a meter-in control valve that controls a flow rate of the working fluid flowing from the hydraulic pump to the hydraulic actuator; a meter-out control valve that controls a flow rate of the working fluid being drained from the hydraulic actuator into a tank; and a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator. The meter-out control valve is connected to the hydraulic actuator in parallel with the regeneration valve.
Claims6
A hydraulic drive system comprising:
- a hydraulic pump that supplies a working fluid to a hydraulic actuator;
- a meter-in control valve that controls a flow rate of the working fluid flowing from the hydraulic pump to the hydraulic actuator;
- a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator;
- a meter-out control valve that is connected to the hydraulic actuator in parallel with the regeneration valve and controls a flow rate of the working fluid being drained from the hydraulic actuator into a tank;
- an operation device that outputs an operation signal corresponding to an amount of operation of an operation tool;
- and
- a control device that controls an opening of each of the regeneration valve and the meter-out control valve so that the working fluid is drained from the hydraulic actuator at a flow rate corresponding to the operation signal from the operation device, wherein
- the control device estimates a regeneration flow rate on the basis of an opening degree of the regeneration valve and controls the opening of the meter-out control valve to cause the working fluid to flow into the tank at a meter-out flow rate which is a difference between a drainage flow rate of the working fluid being drained from the hydraulic actuator according to the operation signal from the operation device and the regeneration flow rate that is estimated.
5 more elements
A hydraulic drive system comprising:
- a hydraulic pump that supplies a working fluid to a hydraulic actuator;
- a meter-in control valve that controls a flow rate of the working fluid flowing from the hydraulic pump to the hydraulic actuator;
- a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator;
- a meter-out control valve that is connected to the hydraulic actuator in parallel with the regeneration valve and controls a flow rate of the working fluid being drained from the hydraulic actuator into a tank;
- a first pressure sensor that measures a drainage pressure which is a pressure of the working fluid being drained from the hydraulic actuator;
- an operation device that outputs an operation signal corresponding to an amount of operation of an operation tool;
- and
- a control device that controls an opening of each of the regeneration valve and the meter-out control valve so that the working fluid is drained from the hydraulic actuator at a flow rate corresponding to the operation signal from the operation device, wherein:
- the control device estimates a regeneration flow rate on the basis of a downstream pressure of the regeneration valve and the drainage pressure of the hydraulic actuator, and
- the downstream pressure of the regeneration valve is estimated on the basis of the drainage pressure measured by the first pressure sensor and an opening degree of the regeneration valve.
7 more elements
A hydraulic drive system comprising:
- a hydraulic pump that supplies a working fluid to a hydraulic actuator;
- a meter-in control valve that controls a flow rate of the working fluid flowing from the hydraulic pump to the hydraulic actuator;
- a regeneration valve that supplies, to the hydraulic actuator, the working fluid drained from the hydraulic actuator,
- a meter-out control valve that is connected to the hydraulic actuator in parallel with the regeneration valve and controls a flow rate of the working fluid being drained from the hydraulic actuator into a tank;
- an operation device that outputs an operation signal corresponding to an amount of operation of an operation tool;
- and
- a control device that controls an opening of each of the regeneration valve and the meter-out control valve so that the working fluid is drained from the hydraulic actuator at a flow rate corresponding to the operation signal from the operation device, wherein
- the control device sets, according to a load state of the hydraulic actuator, a regeneration ratio which is a ratio of a regeneration flow rate to a drainage flow rate of the working fluid being drained from the hydraulic actuator, and controls the opening of the regeneration valve according to the regeneration ratio.
5 more elements
Dependencies are inferred from the claim text.