Hydraulic controller

Abstract

Abstract PURPOSE:To heighten the accuracy of control, by using a feed-forward control valve to perform basic control and by using a feedback control valve to perform the compensation control of the speed or rotation of an operated terminal or the pressure of a line therefor or the like. CONSTITUTION:To obtain a set speed, the flow rate of basic oil is regulated mainly by a proportional electromagnetic control valve 15 which undergoes feed-forward control. The flow rate of oil necessry to attain a required control accuracy is regulated by a servo valve 16 which undergoes feedback control. The range of regulation of oil flow through the servo valve 16 is set at 10 to 20% of the rated flow rate of oil through the control valve 15. A linear compensation circuit 19 is provided as one of the components of a control system for the proportional electromagnetic control valve 15 so that the set speed and the flow rate of oil have linearity. This results in reducing the range of regulation of flow rate through the servo valve 16.

Inventors

• 👤 Shuji Oyagi
• 👤 衆司 大八木
• 👤 Yasuo Iida
• 👤 飯田　泰生
• 👤 Toshio Kishigami
• 👤 岸上　寿夫
• 👤 Yoshiharu Narita
• 👤 成田　義治
• 👤 Hajime Hamada
• 👤 源 浜田

Bibliographic Details