Work vehicle

Patent metadata

Field	Value
Publication number	US-9458598-B2
Application number	US-201414372472-A
Country	US
Kind code	B2
Filing date	Apr 24, 2014
Priority date	Apr 24, 2014
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

There is provided a work vehicle in which sudden operation of a work implement can be suppressed. The work vehicle includes a design surface information acquiring unit for acquiring data of a design surface indicative of a target shape of a work object by the work implement; a cutting edge position computing unit for computing a position of a cutting edge of a bucket; and an operation restricting unit for executing operation restriction control by which a boom is forcibly raised in accordance with a relative position of the cutting edge to the design surface, and the position of the cutting edge is restricted to an upper part of the design surface. In a state where the cutting edge is located away from the design surface in a downward perpendicular direction by a prescribed distance or longer, the operation restricting unit does not execute the operation restriction control.

First claim

The invention claimed is:

1. A work vehicle, comprising:
a work implement having a boom, an arm attached to a distal end of said boom, and a bucket attached to a distal end of said arm;
a design surface information acquiring unit for acquiring data of a design surface indicative of a target shape of a work object by said work implement;
a cutting edge position computing unit for computing a position of a cutting edge of said bucket; and
an operation restricting unit for forcibly raising said boom in accordance with a relative position between the position of said cutting edge of said bucket and said design surface, wherein
in a state where said cutting edge is located away from said design surface in a downward perpendicular direction by a prescribed distance or longer, said operation restricting unit executes control so as not to forcibly raise said boom.

2. The work vehicle according to claim 1 , wherein
when said design surface is a slope inclined by a prescribed angle or larger with respect to a horizontal direction, said operation restricting unit executes control so as not to execute the forcible raising of the boom.

3. The work vehicle according to claim 2 , wherein
said operation restricting unit controls said boom to prevent the position of said cutting edge from becoming lower than said design surface.

4. The work vehicle according to claim 3 , wherein
the work vehicle transmits and receives information to and from the outside by satellite communication.

5. The work vehicle according to claim 2 , wherein
when the position of said cutting edge becomes lower than said design surface, said operation restricting unit forcibly raises said boom.

6. The work vehicle according to claim 5 , wherein
the work vehicle transmits and receives information to and from the outside by satellite communication.

7. The work vehicle according to claim 2 , wherein
the work vehicle transmits and receives information to and from the outside by satellite communication.

8. The work vehicle according to claim 1 , wherein
said operation restricting unit controls said boom to prevent the position of said cutting edge from becoming lower than said design surface.

9. The work vehicle according to claim 8 , wherein
the work vehicle transmits and receives information to and from the outside by satellite communication.

10. The work vehicle according to claim 1 , wherein
when the position of said cutting edge becomes lower than said design surface, said operation restricting unit forcibly raises said boom.

11. The work vehicle according to claim 10 , wherein
the work vehicle transmits and receives information to and from the outside by satellite communication.

12. The work vehicle according to claim 1 , wherein
the work vehicle transmits and receives information to and from the outside by satellite communication.

13. The work vehicle according to claim 1 , wherein
in the state where said cutting edge is located away from said design surface in the downward perpendicular direction by the prescribed distance or longer, with the forcible raising of the boom being in execution, said operation restricting unit executes control so as not to execute the forcible raising of the boom.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Takaura Takeshi
• Kami Yoshiki
• Kitajima Jin

Classifications

• E02F9/262

  with follow-up actions to control the work tool, e.g. controller · CPC title

• E02F9/2033

  Limiting the movement of frames or implements, e.g. to avoid collision between implements and the cabin (sub-groups of E02F3/431 of E02F3/435 take precedence; for turntables E02F9/123) · CPC title

• E02F3/439 Primary

  Automatic repositioning of the implement, e.g. automatic dumping, auto-return (E02F3/438 takes precedence) · CPC title

• E02F3/32

  working downwardly and towards the machine, e.g. with backhoes · CPC title

• E02F9/265

  with follow-up actions (e.g. control signals sent to actuate the work tool) · CPC title