An embodiment of the present disclosure provides a construction machine, which includes a boom, the construction machine including a boom cylinder configured to move the boom upward or downward and includes a head side and a rod side, a boom regeneration valve configured to control a flow rate of a working fluid discharged from a head side of the boom cylinder, an operating device configured to generate an operating signal for operating the boom, an accumulator configured to store the working fluid discharged from the boom cylinder, a regeneration motor configured to produce renewable energy by performing a regenerative operation by using the working fluid discharged from the boom cylinder or the working fluid discharged from the accumulator, and a control device configured to correct an opening area of the boom regeneration valve on the basis of pressure of the accumulator when the boom descends.

An excavator includes a plurality of hydraulic actuators, and a setting unit that performs a setting related to operation speeds of the plurality of hydraulic actuators during a combined operation of the hydraulic actuators, so that when the operation speed of one of the actuators increases, the operation speed of another one of the actuators decreases. The setting unit is capable of performing the setting for a plurality of kinds of combined operations.

A time period for which an ineffective operation is performed during an excavation work is reduced. A work machine includes a vehicular body, a running wheel rotatably attached to the vehicular body, a work implement operable with respect to the vehicular body, an operation apparatus for operating the running wheel and the work implement, and a controller that controls an operation by the work machine. The controller determines that an ineffective operation in which the work implement does not work is being performed during the excavation work based on an operation command value output from the operation apparatus and notifies an operator of occurrence of the ineffective operation.

Construction or worksite machines and related apparatus for use on such machines in various examples have at least one hydraulic cylinder for operating a lift/lower element; at least one hydraulic pump that has at least one electric motor coupled thereto for operating the hydraulic pump, the pump being configured for pumping hydraulic fluid along a flowline for operating at least one hydraulic cylinder that is coupled to the lift/lower element; and energy supply means comprising: at least one battery to provide electrical energy to the electric motor; and at least one hydrogen fuel cell for generating and supplying the battery with electrical energy for charging the battery. The worksite or construction site machine can be for example an excavator with lift/lower elements in the form of a boom, an arm, and a bucket.

A construction equipment includes a lower traveling body; an upper rotating body rotatably supported on the lower traveling body; a work machine which includes a boom, an arm, and a bucket operated by their respective hydraulic cylinder, wherein the work machine is supported by the upper rotating body; a control valve for controlling the hydraulic cylinder; an electronic proportional pressure reducing valve for controlling the spool of the control valve; an operation lever for outputting an operation signal corresponding to an operation amount of a driver; an information providing unit for providing information on the work machine and the work surface; and an electronic control unit for calculating and outputting a pilot pressure for the electronic proportional pressure reducing valve, wherein the electronic control unit controls the speed of the hydraulic cylinder by using the operation signal of the operation lever and the information provided by the information providing unit.

A machine comprises a first ground engaging unit connected to a first leg, a second ground engaging unit connected to a second leg, and a hydraulic system to control heights of the legs, the hydraulic system comprises a fluid circuit to control fluid between the first and second legs, a load holding valve to allow fluid into the fluid circuit, a control valve system to let fluid into the load holding valve, the control valve connected to a hydraulic fluid source and a reservoir, a first lock valve to control flow of fluid between the first and second legs in a first direction, a second lock valve to control flow of fluid between the second and first legs in a second direction, and first and float valves configured to connect the first and second legs to the control valve system, respectively.

Control method for actuating a loader (WL) comprising an arm (B) to which a bucket (BK) is connected, the method comprising in cyclic execution checks (FB) that a first mono-stable button is depressed, if it is depressed, then execution (Sequence) of the following sequence of operations: unloading, shaking, returning to dig position or if the vehicle is equipped with a 4 in 1 shovel: unloading, 4 in 1 shovel opening, shaking, 4 in 1 shovel closing, returning to dig position, otherwise if the first button (FB) is released then stop (STOP) of the execution of the sequence.

A work vehicle includes a vehicle body, a work implement including an attachment, an operating device and a controller. The operating device can be operated to a dump side and a tilt side to cause the attachment to dump and tilt. The controller executes an automatic drive control in which the attachment is caused to dump as far as a predetermined dumping position when the operating device is operated by a first dump operation amount or greater to the dump side, or to tilt as far as a predetermined tilt position when the operating device is operated by a first tilt operation amount or greater to the tilt side. The controller disables the automatic drive control when a switching time period required for the operating device to be switched between the tilt and dump sides is at least a predetermined disabling time period.

This disclosure relates to a hydraulic system for a hydro-mechanical machine comprising a rotary mechanism and a boom cylinder The hydraulic system includes a primary accumulator configured to receive and store high-pressure fluid in response to starting and stopping of the rotary mechanism. A control system configured to enable passage of the high-pressure fluid stored in the primary accumulator to a rotary control valve configured to control the rotary mechanism, and a boom control valve configured to control the boom cylinder through the hydraulic supply circuit, based on a predefined pressure threshold associated with the primary accumulator. A secondary accumulator coupled to the primary accumulator and the control system via the hydraulic supply circuit is configured to store surplus high-pressure fluid provided by the primary accumulator through the hydraulic supply circuit.

A control method for executing a floating function of a boom in a work vehicle includes determining that a predetermined floating function activation command has been inputted by the operator by means of a command input means. When the floating function activation command has been inputted by the operator, acquiring, a signal or data indicative of the current position of the boom along a travel path of the boom over time, the travel path including a first section between a boom full extension position and a deceleration position, a second section between the deceleration position and a grounding position, and a third section between the grounding position and a full retract position, and moving the boom from the current position, determined based on the signal or data indicative of the position of the boom, to the full retract position.