A construction machine, comprising a hydraulic pump, a swing hydraulic motor, a swing electric motor, a delivery capacity regulating device, and a control unit which controls the driving/braking of the swing structure, is configured to comprise an operation amount detection device for detecting the operation amount of the swing control lever and a speed detection device for detecting the speed of the swing electric motor. The control unit includes a hydraulic pump output reduction control unit which takes in an operation amount signal representing the operation amount of the swing control lever detected by the operation amount detection device and a speed signal representing the speed of the swing electric motor detected by the speed detection device and controls the delivery capacity regulating device by calculating a reduction rate of the output of the hydraulic pump based on the detection signals.

The present invention relates to a work machine, in particular in the form of a dump truck or truck, comprising a traction drive unit and/or main work unit which can be driven by a drive apparatus comprising at least one electric motor. The invention further relates to a method for operating such a work machine, in accordance with the invention, the drive apparatus comprises at least one hydraulic motor supporting the electric motor, the hydraulic motor being switched in for starting the drive apparatus and being decoupled on an exceeding of a predefined speed.

A motor generator (27) is connected mechanically to an engine (21) and a hydraulic pump (23). The hydraulic pump (23) delivers pressurized oil to cylinders (11D) to (11F) in a working mechanism (11), a traveling hydraulic motor (25) and a revolving hydraulic motor (26). The revolving hydraulic motor (26) drives a revolving device (3) in cooperation with a revolving electric motor (33). The motor generator (27) and the revolving electric motor (33) are connected electrically to an electricity storage device (31). An HCU (36) sets a target electricity storage rate (SOC0) of the electricity storage device (31) and a pump output limit (POL0) of the hydraulic pump (23) corresponding to a mode selected by a mode selection device (38). The HCU (36) controls the engine (21), the motor generator (27), the revolving electric motor (33) and the electricity storage device (31) corresponding to the target electricity storage rate (SOC0) and the pump output limit (POL0).

Construction machine including: an inverter; a battery; a battery controller; a main controller controlling the inverter based on limited power modes prescribed; and a display device displaying a remaining battery electric power. The main controller calculates open circuit voltage and battery resistance values of the battery at the state of energy of the battery based on the specification information about the battery and state of energy of the battery which are input from the battery controller, calculates an amount of electric power stored in the battery in each of the limited power modes based on the open circuit voltage value and battery resistance value of the battery as well as limited power and operating voltage prescribed for each of the limited power modes, and outputs a display signal for displaying the amount of electric power stored in the battery in each of the limited power.

A shovel includes a traveling body, an upper turning body turnably provided on the traveling body, an attachment including a boom, an arm, and a bucket and attached to the upper turning body, and a processor. The processor is configured to correct the motion of the attachment in such a manner as to control a slip of the traveling body toward the back in the extension direction of the attachment.

The application describes a self-propelling work machine, in the form of a truck, having an electric drive comprising at least one electric motor, a generator drivable by an internal combustion engine for the power supply of the electric drive, and a braking apparatus for braking the work machine, wherein the braking apparatus provides a regenerative braking by the electric drive and a feedback apparatus for feeding back electrical motor braking power of the electric motor to the generator to apply the motor braking power on the internal combustion engine. The application further describes a method for braking the work machine. A braking control apparatus is provided for an automatic connection of a mechanical brake in dependence on the motor braking power fed back to the internal combustion engine and/or in dependence on the operating state of the internal combustion engine acted on by the fed back motor braking power.

The hybrid construction machine includes an engine 11, an electric motor/generator 14, a hydraulic pump unit 17, an electricity storage device 16, an inverter 15, a temperature regulator (16D or 16E), and a hybrid control unit 22. The hybrid control unit 22 executes at least one of first control for controlling a warming-up battery temperature regulator 16D so that it increases a temperature of the electricity storage device 16, second control for controlling the inverter 15 so that it reduces the power output from the inverter 15, and third control for controlling a pump capacity control unit 21 so that it reduces the flow rate of a hydraulic fluid delivered from the hydraulic pump unit 17, according to a charge/discharge history of the electricity storage device 16.

A work vehicle includes a vehicle body frame, an outer cover, an engine compartment, a cooling compartment, a partition wall, an inverter, and a capacitor. The engine compartment contains an engine. The cooling compartment contains a cooling device. The partition wall separates the cooling compartment from the engine compartment. The inverter and the capacitor are disposed between the partition wall and the cooling device. The inverter is positioned above the capacitor. A length of the capacitor in the vehicle width direction is greater than a length of the inverter in the vehicle width direction. At least one of a first side surface of the outer cover positioned leftwards of the left side surface of the inverter and a second side surface of the outer cover positioned rightwards of a right side surface of the inverter is separated from the inverter by a gap.

A construction machine includes an engine, a load estimation unit that estimates a pump power absorption, a regeneration/powering power demand calculation unit that calculates a regeneration/powering power demand according to a state of charge in an electrical storage device, an engine power demand calculation unit that calculates an engine power demand based on the power absorption and regeneration/powering power demand, and a motor generator control unit that performs rotational speed control or torque control. The control unit includes a control switching unit that switches the rotational speed and the torque control according to the engine power demand and the rotational speed of the engine. The control switching unit switches from the torque control to the rotational speed control when during performance of the torque control, the engine power demand increases and the rotational speed of the engine becomes lower than a predetermined rotational speed.

The present disclosure relates to a boom driving system for a hybrid excavator and a control method therefor, and more particularly, to a boom driving system for a hybrid excavator, which drives a hydraulic pump motor so as to move a boom upward and downward, and collects regenerative power of the boom using an electric motor so as to improve fuel efficiency, and a control method for the boom driving system. Provided in exemplary embodiments of the present disclosure is a boom driving system for a hybrid excavator and a control method therefor, which may allow an electric motor generator to normally produce electricity by allowing retraction speed and force of the boom actuator to be controlled to a target speed when a boom is moved downward.