公开(公告)号：US5443087A

公开(公告)日：1995-08-22

申请号：US166255

申请日：1993-12-13

Applicant: Colin K. Myles

Inventor： Colin K. Myles

IPC: G05B11/36 ,  G05B11/50 ,  G05D16/20

CPC classification number: G05D16/2093 ,  G05D16/2053 ,  Y10T137/0396 ,  Y10T137/2544 ,  Y10T137/87201 ,  Y10T137/87209

Abstract: A method and system are provided for controlling a pressurized fluid such as nitrogen gas which may be initially stored at a pressure as high as 20,000 psi. The pressurized nitrogen gas may be utilized in high pressure gas systems such as in gas-assisted injection molding systems or low pressure gas systems such as robotic control and actuators. A valve assembly is utilized in the method and system and includes an electric proportioning device such as a pneumatic servovalve and a pair of pneumatic, fluidly-coupled valves which are piloted by the servovalve to regulate the pressure of the pressurized nitrogen gas. In the method and system, the servovalve operates in a closed loop fashion by utilizing feedback from a feedback device such as a pressure transducer. A controller in the closed loop is responsive to a pressure signal from the pressure transducer and a preset reference signal to provide an error control signal to the servovalve.

Abstract translation: 提供了一种用于控制加压流体例如氮气的方法和系统，其可以最初以高达20,000psi的压力存储。 加压氮气可用于高压气体系统，例如气体辅助注射成型系统或低压气体系统，例如机器人控制和致动器。 在该方法和系统中使用阀组件，并且包括诸如气动伺服阀的电配比装置和由伺服阀引导的一对气动流体耦合阀，以调节加压氮气的压力。 在该方法和系统中，伺服阀通过利用诸如压力传感器之类的反馈装置的反馈以闭环方式工作。 闭环中的控制器响应于来自压力传感器的压力信号和预设的参考信号，以向伺服阀提供误差控制信号。