Hitachi Construction Machinery Co., Ltd.

Ryuji Kouno

Masatsugu Arai

Naoki Fukuda

Takaaki Tanaka

Tadashi Osaka

Takayuki Sato

Takanobu Ikari

Jun Ikeda

A hydraulic drive fan control device is provided with a variable displacement hydraulic pump, a hydraulic motor, a hydraulic drive fan that is driven by the hydraulic motor, a flow amount control valve, a rotational speed detector that detects a rotational speed of an engine, and a controller. The controller outputs a first valve control signal to the flow amount control valve and outputs a first pump control signal to the hydraulic pump to rotate the hydraulic drive fan at a first rotational speed, and outputs a second valve control signal to the flow amount control valve and outputs a second pump control signal to the hydraulic pump, thereby stopping the rotation of the hydraulic drive fan.

Hydraulic drive fan control device

Provided is a clutch control device for a work machine capable of controlling a fan to an appropriate rotational speed. In the clutch control device for the work machine, a controller includes a target fan rotational speed calculation module that calculates a target fan rotational speed for the fan, a clutch characteristic curve storage module that stores a plurality of clutch characteristic curves, a clutch command calculation module that outputs with reference to a clutch characteristic curve a first clutch control signal corresponding to the target fan rotational speed, a feedback control module that output a second clutch control signal based on the difference between the target fan rotational speed and an actual fan rotational speed, and an adder that adds the first clutch control signal and the second clutch control signal to output a third clutch control signal.

Clutch control device for work machine

Growing community of inventors

Mito, Japan

Ryuji Kouno