INTERFERENCE PREVENTING DEVICE FOR CONSTRUCTION MACHINE

Japanese Patent JP3468331

B2

PROBLEM TO BE SOLVED: To continuously move a front device under the prevention of the interference thereof with a cab, maintain a wide working area, and ensure the avoidance of the ingress pf the front device into an interference zone, even upon the appearance of a change in thermodynamic function for affecting the operation characteristic of the front device.
SOLUTION: An arithmetic operation part 7b computes the limit of a boom instruction value, thereby making a correction for an operation signal for a boom operation lever device 4a. Also, a detection line 7m detects the boom instruction value and, then, a control gain operation part 7h and a multiplication part 7i compute an increasing speed instruction value for an arm along an interference avoidance direction, before the entry of a front device into an interference prevention zone. In addition, a limit value operation part 7c, an adding part 7j and a minimum value selector part 7f correct an operation signal for an arm operation lever device 4b. At the same time, oil temperature is detected and a correction is made to extend the control start distances of the arithmetic operation parts 7b to 7d, and 7h, according to an oil temperature drop.

Hiroshi Watanabe
Masakazu Haga
Hiroyuki Adachi
Eiji Egawa
Junichi Hosono
Toshiaki Nishida

JP6468796A

November 17, 2003

March 21, 1996

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Hitachi Construction Machinery Co., Ltd.

E02F3/43; E02F9/20; E02F9/24; (IPC1-7): E02F3/43; E02F9/24

JP6294150A
JP6146326A
JP771051A
JP73846A
JP735105A
JP5321290A
JP3217523A
JP6104985B2

【文献】国際公開95/030059(WO,A1)

Kasuga

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