Patent Number: 6,308,516

Title: Control device for hydraulically-operated equipment

Abstract: Workability and operability of hydraulically-operated equipment is enhanced by optimally changing in accordance with the work content a responsiveness of an output signal relative to an input signal of each hydraulic control device, which constitutes a hydraulic system, at times heightening quick reaction capabilities, and at other times heightening steadiness. As a quantity of state of a load pressure signal of a hydraulic actuator, for example, is inputted to a response suppressing portion, and in accordance with a high-pass filter, a higher frequency fluctuation component in a pressure signal is extracted. An operation quantity of an operation lever, for example, is inputted from a suppression quantity specifying portion, and a frequency domain extracted by the high-pass filter is changed so as to become a narrow range of greater than a higher frequency in accordance with an operation quantity becoming larger, and further, so as to become a broad range of greater than a lower frequency in accordance with an operation quantity becoming smaller. Then, a compensation operation is performed, which subtracts from a flow command to a response suppression target apparatus, a signal of a high frequency component of a hydraulic actuator load pressure, and a compensated flow command is outputted to the response suppression target apparatus.

Inventors: Kamada; Seiji (Hiratsuka, JP)

Assignee: Komatsu Ltd.

International Classification: E02F 9/22 (20060101); E02F 9/20 (20060101); F15B 11/00 (20060101); F15B 11/16 (20060101); F15B 21/08 (20060101); F15B 21/00 (20060101); F16D 031/02 ()

Expiration Date: 10/30/2018