A power system for a working machine, including a prime mover drivingly connectable to a main shaft; a planetary gear set including a rotatable first member drivingly connected to the main shaft, a rotatable second member and a rotatable third member for propulsion of the working machine; a hydraulic system including at least one hydraulic actuator for performing a working function of the working machine; an electric energy storage system; a first hydraulic machine mechanically coupled to the main shaft and hydraulically coupled to the hydraulic system; a first electric machine mechanically coupled to the main shaft; a second electric machine mechanically coupled to the rotatable second member, wherein the electric energy storage system is electrically connected to the first and second electric machines, and wherein the power system further includes a second hydraulic machine mechanically coupled to the rotatable second member and hydraulically coupled to the hydraulic system.

The disclosure relates to a work machine, in particular a duty-cycle crawler crane, having an undercarriage which comprises a middle part and at least one crawler carrier which is connected to the middle part and comprises at least one electric traction drive, wherein at least one supply line runs from the middle part to the traction drive and is connected to the latter in a disconnectable manner via a first connection. According to the disclosure, the work machine comprises an electrical interlock loop, which is connected to the traction drive via the first connection, and a mating plug connector module, which is arranged on the undercarriage and has a first mating connection for connecting to the first connection of the supply line and is configured to bridge the interlock loop, which is interrupted by a disconnection from the traction drive, in a current-conducting manner.

The disclosure relates to a work machine, in particular a duty-cycle crawler crane, having an undercarriage which comprises a middle part and at least one crawler carrier connected to the middle part and having at least one electric traction drive, wherein at least one energy transmission line for supplying power to the traction drive and at least one further supply line runs between the traction drive and the middle part. According to the disclosure, the at least one energy supply line and the at least one further supply line run together in a separate protection means outside the middle part and the crawler carrier.

A plus-side main connection line (27) connects electrical equipment (21), (22) to a plus terminal (26A) of a battery (26). A plus-side isolating switch (28) is provided in the plus-side main connection line (27) to connect or disconnect the electrical equipment (21), (22) and or from the plus terminal (26A) of the battery (26). A plus-side auxiliary connection line (30) connects a urea SCR controller (25) to the plus terminal (26A) of the battery (26) in a position upstream of the plus-side isolating switch (28). A minus-side main connection line (32) connects a minus terminal (26B) of the battery (26) to ground. A minus-side isolating switch (33) is provided in the minus-side main connection line (32) to connect or disconnect the minus terminal (26B) of the battery (26) and or from ground.

The present invention relates to an electric driven hydraulic power system for heavy equipment, and more particularly, to a hydraulic power system, which includes a hydraulic pump operated by a battery and a motor, a supply line for supplying a hydraulic oil that is supplied by the hydraulic pump, a plurality of actuators, and a controller for controlling the motor and the actuators, in which electrical efficiency is significantly improved. In particular, the present invention relates to an electric driven hydraulic power system in which a plurality of motors and a plurality of hydraulic pumps corresponding to the motors, respectively, are provided, and a main control valve (MCV) for receiving a hydraulic oil from the hydraulic pumps to supply the hydraulic oil to a plurality of actuators is provided, so that efficient control is performed according to an operating load, an operating temperature, a supply flow rate, and the like to minimize power consumption of the motor, and thus electrical efficiency is improved to dramatically increase an operating time.

A drive for a work machine includes a computer configured to control a first electric motor for driving vehicle wheels and a second electric motor for driving a work attachment. The computer is configured to process signals which correspond to control of a movement of a lifting mechanism of the work attachment or a bucket of the work attachment. The computer is further configured to process a signal which corresponds to a position of an accelerator pedal. The first electric motor and the second electric motor are configured to be controlled separately from each another, and control of the second electric motor takes place according to the control of the movement of the work attachment.

An exemplary construction machine comprises a power supply device that is connected to an external power source and outputs first power, a battery provided to be chargeable with the first power, and an electric motor that is driven by the first power and/or second power discharged by the battery. The construction machine further comprises a control device that controls the construction machine in any of a plurality of modes including a drive chargeable mode in which the first power can be used for charging the battery while being used for driving the electric motor, and a charge-only mode in which the first power can be used only for charging the battery. In the case of the drive chargeable mode, the control device sets the upper limit value of the amount of charge of the battery lower than in the case of the charge-only mode.

The available power surge capacity of a battery is detected. The available steady state regeneration energy capacity of the battery is also detected. The available battery generation power, available from an electric motor, is detected as well. The generation power available from the electric motor is applied to regenerate (or recharge) the battery based upon the available power surge capacity, and the available steady state capacity of the battery.

In a case of a normal operation, a battery controller (22) assumes a normal operation mode and permits charging and discharging of a battery module (21). Upon receiving a discharge command from a vehicle body controller (17) for completely discharging the battery module (21), the battery controller (22) assumes a discharge mode to discharge the battery module (21) to reach a safe voltage level and store discharge information. Upon reading out the discharge information, the battery controller (22) assumes a discharge prohibition mode to prohibit charging and discharging of the battery module (21).

An authentication unit performs authentication of an operator. A storage unit stores setting data associated with a plurality of operators. A vehicle body control unit outputs a control signal to drive a vehicle body of the work machine with power supplied by a power source, based on the setting data associated with the authenticated operator. The authentication unit receives the authentication when the power source is stopped and does not receive the authentication when the power source is driven.