Patent application number | Description | Published |
20110240146 | CONTROL DEVICE FOR HYBRID CONSTRUCTION MACHINE - A regulator that performs control such that a tilt angle of a variable volume pump increases as a pilot pressure in a pilot flow passage decreases is provided, and when a controller determines that all of a plurality of operation valves for controlling a flow of a discharged oil that is led from the variable volume pump to respective actuators are in a neutral position, the controller supplies the discharged oil from the variable volume pump to a regenerative hydraulic motor by setting a solenoid valve in an open position and sets a pilot flow passage change-over solenoid valve in a blocking position such that the pilot pressure led to the regulator through the pilot flow passage is reduced by a pressure reducing valve. | 10-06-2011 |
20110265467 | CONTROL DEVICE FOR HYBRID CONSTRUCTION MACHINE - A control device for a hybrid construction machine includes a discharge pressure introduction passage that leads a discharge pressure from a variable volume pump to a regulator, and a load pressure introduction passage that leads one of a maximum load pressure of respective actuators and a load pressure of a hydraulic motor to the regulator. A controller, having determined that the actuators are in an inoperative condition on the basis of a detection result from an operating condition detector, excites a solenoid of a solenoid pilot control valve such that a discharge oil from the variable volume pump is led to the hydraulic motor, and controls the regulator such that a differential pressure between the discharge pressure of the variable volume pump and the load pressure of the hydraulic motor is kept constant. | 11-03-2011 |
20110270498 | CONTROL DEVICE FOR HYBRID CONSTRUCTION MACHINE - A control device for a hybrid construction machine includes a regulator that performs control such that a tilt angle of a variable volume pump increases as an exerted pilot pressure decreases. A controller switches a main switch valve such that an oil discharged from the variable volume pump is led to a regenerative hydraulic motor and switches a pilot selection valve such that a second pilot flow passage provided with a solenoid variable pressure reducing valve communicates with the regulator when all of a plurality of operation valves are determined to be in a neutral position. | 11-03-2011 |
20110271669 | HYBRID CONSTRUCTION MACHINE - A hybrid construction machine includes a control valve provided in a flow passage that connects an actuator to a regenerative hydraulic motor, an opening of which is controlled by a pilot pressure led to a pilot chamber thereof; and a solenoid pilot control valve that leads a pressure on an upstream side of the control valve to the pilot chamber. In the control valve, a pressure receiving area of a main spool for receiving the pilot pressure is equal to an area obtained by subtracting a pressure receiving area of the main spool for receiving a pressure of an outflow port in a direction for moving the main spool against a biasing force of a biasing member from a pressure receiving area of the main spool for receiving a pressure of the outflow port in a direction for moving the main spool against the pilot pressure. | 11-10-2011 |
20150152900 | CONTROL SYSTEM FOR CONSTRUCTION MACHINE - 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. | 06-04-2015 |
20150176609 | CONTROL SYSTEM FOR HYBRID CONSTRUCTION MACHINE - A control system for hybrid construction machine includes: an operation valve for operating a boom; a variable displacement type fluid pressure motor; a distribution mechanism adapted to adjust a flow to be distributed to the fluid pressure motor; a motor generator adapted to be rotated integrally with the fluid pressure motor; a variable displacement type assist pump adapted to be rotated integrally with the motor generator; a distribution mechanism control unit adapted to control the distribution mechanism; a tilt angle control unit adapted to control tilt angles of the fluid pressure motor and the assist pump; and a motor generator control unit adapted to maintain a rotation speed of the motor generator at a target rotation speed. The target rotation speed at the time of boom regeneration control is set to higher than the target rotation speed in a case where only an assist control is carried out. | 06-25-2015 |
20150184364 | CONTROL SYSTEM FOR HYBRID CONSTRUCTION MACHINE - A control system for a hybrid construction machine includes: a turning motor provided in a turning circuit; a pressure detector for detecting a turning pressure of the turning motor; a variable displacement type of fluid pressure motor for regeneration which is rotated by means of pressurized fluid guided from the turning motor; a motor generator adapted to be rotated integrally with the fluid pressure motor; and a controller adapted to predict a turning regeneration flow from the turning motor on the basis of the turning pressure detected by pressure detector to control a tilt angle of the fluid pressure motor on the basis of the predicted turning regeneration flow. | 07-02-2015 |
20150275938 | CONTROL SYSTEM FOR HYBRID CONSTRUCTION MACHINE - A control system for a hybrid construction machine includes a turning-regeneration-use switching valve that opens when a pressure detected by a pressure detector reaches a turning-regeneration starting pressure, so as to introduce the working fluid from a turning circuit to a regenerative motor, an operating-state detector that detects an operating state of a fluid pressure cylinder; and a cylinder-regeneration-use switching valve that opens based on a detection result of the operating-state detector, so as to introduce the working fluid from the fluid pressure cylinder to the regenerative motor. When the turning regeneration is performed alone, the working fluid from the turning circuit is introduced into the regenerative motor without pressure reduction, When the turning regeneration and the cylinder regeneration are simultaneously performed, the working fluid from the turning circuit is reduced in pressure, joins the working fluid from the fluid pressure cylinder, and is introduced into the regenerative motor. | 10-01-2015 |