US 11,939,745 B2
Electrically driven construction machine
Takeshi Ishii, Hino-Cho (JP); Kiwamu Takahashi, Moriyama (JP); Taihei Maehara, Koka (JP); and Tatsuo Takishita, Koka (JP)
Assigned to Hitachi Construction Machinery Tierra Co., Ltd., Koka (JP)
Appl. No. 16/980,669
Filed by Hitachi Construction Machinery Tierra Co., Ltd., Koka (JP)
PCT Filed May 23, 2019, PCT No. PCT/JP2019/020455
§ 371(c)(1), (2) Date Sep. 14, 2020,
PCT Pub. No. WO2020/049805, PCT Pub. Date Mar. 12, 2020.
Claims priority of application No. 2018-166403 (JP), filed on Sep. 5, 2018.
Prior Publication US 2021/0025132 A1, Jan. 28, 2021
Int. Cl. G05B 99/00 (2006.01); B60L 9/00 (2019.01); B60L 15/38 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01); H02J 3/14 (2006.01); H02J 7/02 (2016.01); E02F 3/32 (2006.01); E02F 3/42 (2006.01); G05B 15/02 (2006.01); G05B 19/02 (2006.01); H02P 27/06 (2006.01)
CPC E02F 9/207 (2013.01) [B60L 9/00 (2013.01); B60L 15/38 (2013.01); E02F 9/2004 (2013.01); E02F 9/2228 (2013.01); E02F 9/2267 (2013.01); E02F 9/2271 (2013.01); E02F 9/2285 (2013.01); H02J 3/14 (2013.01); H02J 7/02 (2013.01); B60L 2200/40 (2013.01); B60L 2240/421 (2013.01); E02F 3/32 (2013.01); E02F 3/425 (2013.01); E02F 9/2292 (2013.01); G05B 15/02 (2013.01); G05B 19/02 (2013.01); G05B 2219/2639 (2013.01); H02P 27/06 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An electrically driven construction machine comprising:
an electric motor;
a hydraulic pump driven by the electric motor;
a plurality of hydraulic actuators driven by a pressurized fluid delivered from the hydraulic pump;
a plurality of directional control valves that control flows of the pressurized fluid supplied from the hydraulic pump to the plurality of hydraulic actuators; and
a plurality of operation devices that generate operation signals for instructing operation of the plurality of hydraulic actuators and switching the plurality of directional control valves,
the electric motor being driven by an electric power from an electric power receiving facility;
wherein the electrically driven construction machine further comprises:
a communication device that transmits and receives data to and from other electrically driven construction machines sharing the electric power receiving facility; and
a controller configured to compute an own demanded power for driving the plurality of hydraulic actuators on a basis of the operation signals of the plurality of operation devices, transmit the own demanded power to the other electrically driven construction machines through the communication device, and receive demanded powers computed in the other electrically driven construction machines through the communication device, and
wherein the controller is further configured to compute an allowable power usable by the electric motor on a basis of the own demanded power, demanded powers of the other electrically driven construction machines received through the communication device, and a predetermined allowable electric power of the electric power receiving facility, and control the electric motor such that a power consumption of the electric motor does not exceed the allowable power usable by the electric motor.