US 12,077,933 B2
Work machine
Hisami Nakano, Tsuchiura (JP); Hiroaki Tanaka, Kasumigaura (JP); and Yusuke Suzuki, Tsuchiura (JP)
Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
Appl. No. 17/437,879
Filed by HITACHI CONSTRUCTION MACHINERY CO., LTD., Tokyo (JP)
PCT Filed Sep. 23, 2020, PCT No. PCT/JP2020/035871
§ 371(c)(1), (2) Date Sep. 10, 2021,
PCT Pub. No. WO2021/060302, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-173087 (JP), filed on Sep. 24, 2019.
Prior Publication US 2022/0170234 A1, Jun. 2, 2022
Int. Cl. E02F 3/43 (2006.01); E02F 9/20 (2006.01); E02F 9/22 (2006.01)
CPC E02F 3/439 (2013.01) [E02F 3/436 (2013.01); E02F 9/2041 (2013.01); E02F 9/2228 (2013.01); E02F 9/2285 (2013.01); E02F 9/2292 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A work machine comprising:
a work device having a boom, an arm, and a bucket;
an operation device for operating the work device; and
a controller capable of controlling the work device using an excavation work control for controlling the work device so as to cause a claw tip of the bucket to move along a predetermined target surface and a leveling work control for controlling the work device so as to cause the bucket to move along the target surface while maintaining a posture of the bucket with respect to the target surface, wherein
the controller is configured to:
calculate, based on posture data and size data on the work device and position data on the target surface, an arm tip difference that is a distance from a tip pin to the target surface, the tip pin connecting the arm with the bucket,
execute the leveling work control in a case of the calculated arm tip difference being equal to or less than a predetermined threshold, there being no input of a bucket operation to the operation device, and there being an input of an arm operation to the operation device, and
execute the excavation work control in a case of the calculated arm tip difference being more than the predetermined threshold, or in a case of there being an input of the bucket operation to the operation device, or in a case of there being no input of the arm operation to the operation device,
wherein the predetermined threshold is a distance from the tip pin to a claw tip of the bucket.