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Controller

A technology for controllers and control calculations, applied in electric controllers, adaptive controls, controllers with specific characteristics, etc., can solve the problem of reducing sensitivity to parameters

Inactive Publication Date: 2005-07-20
YOKOGAWA ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, there is a need for controllers which can be easily set with a small number of parameters and which make the process less sensitive to the parameters

Method used

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no. 1 example

[0054] The controller of the present invention essentially has a mechanism for bringing the characteristics of the overall system, including the processing and control parts, close to a response that theoretically does not cause overshoot to occur, eg, that of a first order lag system.

[0055] exist figure 1 As shown in the trend graph of the step response from the initial value of the deviation "-1" to the first-order lag with the deviation "0", the step response of the first-order lag does not cause overshooting. That is, in the step response of the first-order lag, for example, when the time constant is 20 seconds, the time constant is 10 seconds, and the time constant is 5 seconds, if the time s is taken in the direction of the horizontal axis and the deviation is taken in the direction of the vertical axis, The step responses each asymptotically approach "0" with the passage of time, and overshoot beyond the deviation "0" does not occur.

[0056] To express the response ...

no. 2 example

[0083] In the following, it will be discussed with reference to illustrations that, in the case where the process is nonlinear, PID control is performed by the controller including the desired set point path generating section 11 of the first embodiment.

[0084] Figure 9 is a partial block diagram of the controller, showing a case where the control using the desired setpoint path generating section 11 of the embodiment is applied to the nonlinear processing 13A.

[0085] In the embodiment, the desired set point path generating section 11 is located in front of the control operation section 12, and calculates the desired set point path SLSP based on the desired set point SP and the rate of change of the process value PV, so that the desired set point path SLSP Continuously provided to the PID controller 12.

[0086] Therefore, referring to the previous Figure 5 and Figure 6 Describing the desired setpoint path SLSP, the response of the process value PV from process 13A b...

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Abstract

A controller includes a desired set point path generation section that generates a desired set point path, where a process value settles into a desired set point, based on the process value and the desired set point inputted, and a control operation section that calculates a manipulated value for an operation of a process which outputs the process value, based on the desired set point path.

Description

technical field [0001] The present invention relates to a controller for improving closed-loop control characteristics by performing PID operations and the like, and more particularly, to a controller for suppressing overshoot, improving stability (control strength) of a control system, and suppressing influence of disturbances. Background technique [0002] Such as Figure 13 As shown in the background, the controller for controlling the process 115 of output process value PV includes a rate-of-change adjustment section 111 , an auxiliary control section 112 , a selection section 113 , and a PID control operation section 114 . When the desired set point SP is input to the rate-of-change adjustment section 111, the rate-of-change adjustment section 111 outputs the set point TSP of a signal that changes from zero to the desired set point SP within a predetermined time. When the desired set point SP, the set point TSP, and the process value PV are input to the auxiliary contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/00G05B13/02
CPCG05B13/021
Inventor 田中义雄田中觉
Owner YOKOGAWA ELECTRIC CORP
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