US 9,481,976 B2Granted

Work vehicle

AssigneeKomatsu Ltd.

InventorsYoshiki Kami, Takeo Yamada, Yuto Fujii, Takeshi Takaura

Life of this patent

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Abstract

A work vehicle includes a boom, an arm, a bucket, an arm control member, a speed limit determination portion, and a target speed determination portion. The speed limit determination portion determines a speed limit for limiting a speed of a cutting edge of the bucket in accordance with a distance between a cutting edge and a design surface. The target speed determination portion determines a target speed of the boom based on the speed limit. The speed limit determination portion decides on a speed limit calculated based on correlation between the speed limit and the distance between the design surface and the cutting edge when an amount of operation of the arm control member is equal to or greater than a prescribed amount and decides on a speed limit lower than the speed limit calculated based on the correlation when the amount of operation is smaller than the prescribed amount.

Claims7

Dependent claims

A work vehicle, comprising:

a boom;
an arm;
a bucket;
an arm control member;
a speed limit determination portion determining a speed limit for limiting a speed of a cutting edge of said bucket in accordance with a distance between the cutting edge of said bucket and design topography when a distance between the cutting edge of said bucket and the design topography is equal to or smaller than a prescribed distance;
and
a target speed determination portion determining a target speed of said boom based on said speed limit determined by said speed limit determination portion,
said speed limit determination portion deciding on a speed limit calculated based on correlation between said speed limit and a distance between the design topography and the cutting edge of said bucket when an amount of operation of said arm control member is equal to or greater than a prescribed amount, and deciding on a speed limit lower than the speed limit calculated based on said correlation when the amount of operation of said arm control member is smaller than the prescribed amount.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/419,542Filed 10 Sep 2014
Published: US 2016/0145827 A126 May 2016
Granted: 1 Nov 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

E02F 3/435
Control of dipper or bucket position; Control of sequence of drive operations: for dipper-arms, backhoes or the like
E02F 3/30
With digging tools mounted on a dipper- or bucket-arm , i.e. there is either one arm or a pair of arms, e.g. dippers, buckets: with a dipper-arm…
E02F 3/437
For dipper-arms, backhoes or the like: providing automatic sequences of movements, e.g. linear excavation, keeping dipper angle constant
E02F 9/262
Surveying the work-site to be treated: with follow-up actions to control the work tool, e.g. controller