Title:
PROCESS VALUE DETECTOR
Document Type and Number:
Japanese Patent JPS6418018
Kind Code:
A
Abstract:
PURPOSE:To obtain reliability effect equal to that in the triplication of a detector concerning a control system which is difficult in the triplication thereof, by outputting a command signal when an absolute value of a difference between detection values is above a specified value, as computed from two detectors which detect the same process values to select one detection value on a basis of a specified rule. CONSTITUTION:One of the detection values of two flow rate detectors 2 and 3 is selected 4 on a basis of a specified rule. A flow rate of heavy oil is estimated 6 based on a detection value or the like of an air flow rate detector 12 of a flow rate of air as other process value in a fixed correlationship with a desired flow rate of heavy oil. Based on the estimated flow rate, either of detection values of the detectors 2 and 3 is determined 7 to be a true value and outputted. On the other hand, a command signal is generated 5 when a difference between detection values of the detectors 2 and 3 is above a specified value. Thus, normally, when the detection value selected 4 with an output switch 8 is outputted and a command signal is generated 5, it is switched over to a detection value previously determined 7 to be a true value and outputted.
Inventors:
YAMAMOTO AKIO
HANABUSA MASATOSHI
HANABUSA MASATOSHI
Application Number:
JP17536287A
Publication Date:
January 20, 1989
Filing Date:
July 14, 1987
Export Citation:
Assignee:
TOSHIBA CORP
TOSHIBA ENGINEERING CO
TOSHIBA ENGINEERING CO
International Classes:
G01D5/12; G01D1/16; G01D1/18; G01D21/00; G05B9/03; (IPC1-7): G01D1/18; G01D5/12; G01D21/00; G05B9/03
Attorney, Agent or Firm:
Kazuo Sato