Pneumatic system operation control device and control method

Patent metadata

Field	Value
Publication number	US-10550837-B2
Application number	US-201616064868-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Dec 25, 2015
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A pneumatic system operation control device for variable control of the rotation speed of an electric motor for driving an air-compressor such that constantly supplied pressure to a terminal device is achieved in accordance with a discharge pressure measurement value of the air-compressor and a supply pressure measurement value to the terminal device. The control device: stores the discharge pressure measurement value and the supply pressure measurement value; and, upon receiving input of an air pipe network model composed of data for calculating a flow of air in an air pipe network, calculates a flow rate of air supplied to the terminal device and an update value of a control setting value, and updates the control setting value to be used for variable control on the basis of the update value.

First claim

The invention claimed is:

1. A pneumatic system operation control device that variably controls a rotational speed of an electric motor for driving an air compressor so that a supply pressure to a terminal device becomes constant using a measurement value of a discharge pressure of the air compressor and a measurement value of the supply pressure to the terminal device, the pneumatic system operation control device comprising:
a measurement value storage unit that stores the discharge pressure measurement value and the supply pressure measurement value;
an air piping network model input unit that receives an air piping network model composed of data for calculating air flow in an air piping network, the air piping network being a path for supplying compressed air from the air compressor to the terminal device;
an air piping network model storage unit that stores the air piping network model;
a terminal device flow rate calculation unit that calculates an air flow rate supplied to the terminal device using the discharge pressure measurement value, the supply pressure measurement value, and the air piping network model;
a terminal device flow rate storage unit that stores the air flow rate;
a control set value calculation unit that calculates an updating value for a control set value using a control set value for variably controlling the rotational speed of the electric motor for driving the air compressor, the air flow rate and the air piping network model;
a control set value storage unit that stores the updating value, and
a control set value updating command value generation unit that generates a command value for updating a control set value for variably controlling the rotational speed of the electric motor for driving the air compressor using the updating value.

2. The pneumatic system operation control device according to claim 1 , wherein the control set value calculation unit calculates the updating value for the control set value and an updating value for a set value of the supply pressure to the terminal device.

3. The pneumatic system operation control device according to claim 1 ,
wherein the control set value calculation unit outputs an air flow calculation result in the air piping network with a condition before and after the control set value is updated,
the control set value storage unit stores the air flow calculation result, and
the pneumatic system operation control device includes a display unit for displaying pressure fluctuations at the terminal device or a power consumption of the air compressor from the air flow calculation result with the condition before and after the control set value is updated.

4. A pneumatic system operation control method using the pneumatic system operation control device according to claim 1 ,
wherein calculating the updating value for the control set value includes outputting an air flow calculation result in the air piping network with a condition before and after the control set value is updated,
storing the updating value includes storing the air flow calculation result, and
the pneumatic system operation control method includes displaying pressure fluctuations at the terminal device or a power consumption of the air compressor from the air flow calculation result with the condition before and after the control set value is updated.

5. A pneumatic system operation control method of variably controlling a rotational speed of an electric motor for driving an air compressor so that a supply pressure to a terminal device becomes constant using a measurement value of a discharge pressure of the air compressor and a measurement value of a supply pressure to the terminal device, the pneumatic system operation control method comprising:
storing the discharge pressure measurement value and the supply pressure measurement value;
receiving an air piping network model composed of data for calculating air flow in an air piping network, the air piping network being a path for supplying compressed air from the air compressor to the terminal device;
storing the air piping network model;
calculating an air flow rate supplied to the terminal device using the discharge pressure measurement value, the supply pressure measurement value, and the air piping network model;
storing the air flow rate;
calculating an updating value for a control set value using the control set value for variably controlling the rotational speed of the electric motor for driving the air compressor, the air flow rate, and the air piping network model;
storing the updating value; and
updating the control set value for variably controlling the rotational speed of the electric motor for driving the air compressor using the updating value.

6. The pneumatic system operation control method according to claim 5 ,
wherein calculating the updating value for the control set value includes calculating the updating value for the control set value and an updating value for a set value for the supply pressure to the terminal device.

Assignees

• Hitachi Industry Equipment Systems Co Ltd

Inventors

• Yashiki Tatsurou
• Liu Yaping
• Katagiri Yukinori

Classifications

• F05B2270/101

  to control rotational speed (n) · CPC title

• F05B2270/327

  Rotor or generator speeds · CPC title

• F04B49/06 Primary

  Control using electricity (regulating by means of floats actuating electric switches F04B49/04) · CPC title

• F04B2205/09

  Flow through the pump · CPC title

• F04B49/106

  Responsive to pumped volume · CPC title