Hitachi Construction Machinery Co., Ltd.

Toshiaki Nishida

Shigehisa Hagura

Kazuhiko Hiraoka

Tomoyuki Miyata

Hiroyuki Isobe

Kazunori Komatsu

Masao Nakamura

Hiroki Tanaka

Hiroyuki Adachi

Hiroshi Watanabe

Masakazu Haga

Eiji Egawa

Mitsuo Kihara

Junichi Hosono

Hydraulic excavator

A calculating portion 7a calculates a distance from the tip end of a front device to an interference prevention area, and a detection line 7m detects a moving speed of a boom 1. If the tip end of the front device comes close to the interference prevention area when the boom 1 is moving upward, control is made such that, while continuing to move the boom 1 upward, a control gain calculating portion 7h and a multiplier 7i cooperatively calculate a target speed of an arm in the arm dumping direction (interference avoiding direction) corresponding to the boom-up speed, and an input limit value calculating portion 7c, an adder 7j and a minimum value selecting portion 7f cooperatively control the arm to move in the interference avoiding direction relative to a vehicle body. Interference avoidance control enabling the tip end of the front device to be moved smoothly along the vicinity of a boundary of the interference prevention area is thereby effected and the front device can be prevented from interfering with the vehicle body without reducing the maneuverability and the working efficiency.

Interference preventing system for construction machine

Growing community of inventors

Ushiku, Japan

Toshiaki Nishida