US 12,264,451 B2
Hydraulic excavator
Yusuke Suzuki, Ibaraki (JP); Hiroaki Tanaka, Ibaraki (JP); and Hisami Nakano, Ibaraki (JP)
Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Appl. No. 17/801,809
Filed by HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
PCT Filed Jan. 27, 2021, PCT No. PCT/JP2021/002885
§ 371(c)(1), (2) Date Aug. 24, 2022,
PCT Pub. No. WO2022/162795, PCT Pub. Date Aug. 4, 2022.
Prior Publication US 2023/0091185 A1, Mar. 23, 2023
Int. Cl. E02F 3/32 (2006.01); E02F 3/43 (2006.01); E02F 9/12 (2006.01); E02F 9/22 (2006.01); E02F 9/26 (2006.01)
CPC E02F 3/435 (2013.01) [E02F 3/32 (2013.01); E02F 9/2203 (2013.01); E02F 9/262 (2013.01); E02F 9/2221 (2013.01); E02F 9/2285 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A hydraulic excavator comprising: a traveling body that travels;
a stewing body mounted to the traveling body to be slewable;
a working front mounted to the slewing body to be swingable, the working front having a boom, an arm, and a bucket;
an actuator configured to drive the boom, the arm, and the bucket;
an operation amount detector configured to detect an operation amount of an operation device to operate the actuator;
a posture detector configured to detect a posture of the working front and a posture of the slewing body;
a target surface management unit configured to set a construction target surface and calculate a target surface distance that is a distance between the set construction target surface and the bucket;
a drive controller configured to calculate a target operation speed of the actuator based on the operation amount, the posture of the working front, and the target surface distance so that the bucket excavates along the construction target surface, and generate a motion command value to the actuator; and
a drive unit configured to drive the actuator in accordance with the motion command value,
wherein:
the drive controller is configured to determine a target jack-up speed when the hydraulic excavator jacks up the hydraulic excavator based on the target surface distance, and correct the target operation speed based on the determined target jack-up speed.