Fluid pressure regulator
AssigneeSMC Corporation
InventorsNaoto Inayama, Masao Kajitani
Life of this patent
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Abstract
A fluid pressure regulator has a program controller, a PID controller, a second PID controller, a drive controller, a solenoid-operated valve for supplying a fluid, a solenoid-operated valve for discharging a fluid, a diaphragm, a main valve, and a pressure sensor. Based on a desired preset value and/or a desired control program inputted from an external source, the fluid pressure regulator regulates the pressure or flow rate of the fluid discharged from a discharge port of the main valve. A detecting mechanism is combined with a controlled object for supplying a controlled variable in the controlled object to the second PID controller through a feedback loop.
Claims4
A fluid pressure regulator comprising:
- a main valve having a fluid supply valve body and a fluid discharge valve body for regulating the pressure or flow rate of a fluid;
- a diaphragm for operating said fluid supply valve body and said fluid discharge valve body;
- a sensor for detecting the pressure or flow rate of the fluid discharged from said main valve and outputting a detected signal representing the detected pressure or flow rate;
- a drive controller for outputting a drive signal based on a control signal inputted thereto;
- a first solenoid-operated valve and a second solenoid-operated valve, said first and second solenoid-operated valves being openable and closable by said drive signal for controlling the supply of the fluid and the discharge of the fluid by said diaphragm;
- a program controller for storing a preset value and/or a control program inputted from an external source and outputting a control signal based on said preset value and/or said control program;
- a first PID controller for outputting, to said drive controller, a PID conversion signal converted based on the control signal outputted from said program controller and the detected signal outputted from said sensor;
- a detecting mechanism for detecting a controlled variable in a controlled object and outputting a second detected signal representative of the detected controlled variable;
- and
- a second PID controller for outputting to said first PID controller, a PID conversion signal converted based on the second detected signal outputted from said detecting mechanism and the control signal outputted from said program controller.
A fluid pressure regulator for increasing and reducing a fluid supplied to and discharged from a diaphragm based on a fluid supplied to and discharged from solenoid-operated valves which are energized and de-energized, for thereby regulating the pressure or flow rate of a fluid discharged from a main valve, comprising:
- a case;
- a sensor for detecting the pressure or flow rate of the fluid discharged from the main valve;
- a first PID controller, said solenoid-operated valves and said sensor being electrically connected to said first PID controller;
- a program controller electrically connected to said controller for being supplied with and storing a preset value and/or a control program;
- and
- a detecting mechanism for detecting a controlled variable in a controlled object connected to a discharge port of said main valve, said detecting mechanism being electrically connected to said program controller and to a second PID controller,
- said second PID controller outputting to said first PID controller, a PID conversion signal converted based on a signal outputted from said detecting mechanism and a control signal outputted from said program controller,
- said first PID controller, said second PID controller and said program controller being integrally provided in said case.
Dependencies are inferred from the claim text.