GB1235519A - Control of a process variable with the aid of a computer - Google Patents

Control of a process variable with the aid of a computer

Info

Publication number
GB1235519A
GB1235519A GB5146868A GB5146868A GB1235519A GB 1235519 A GB1235519 A GB 1235519A GB 5146868 A GB5146868 A GB 5146868A GB 5146868 A GB5146868 A GB 5146868A GB 1235519 A GB1235519 A GB 1235519A
Authority
GB
United Kingdom
Prior art keywords
amplifier
variable
computer
signal
impedance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5146868A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell Internationale Research Maatschappij BV
Original Assignee
Shell Internationale Research Maatschappij BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Publication of GB1235519A publication Critical patent/GB1235519A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Feedback Control In General (AREA)

Abstract

1,235,519. Automatic control. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. Oct.30, 1968 [Nov. 1, 1967], No.51468/68. Heading G3R. A signal corresponding to the magnitude of a process variable is applied to a digital computer which calculates any necessary correction of that variable and applies a corresponding signal, intermittently through an amplifier having capacitive feedback, to correct the variable, a signal corresponding to the magnitude of the variable also being applied through an impedance to the amplifier during the intervals between corrections by the computer. In Fig.1, a D.C. signal dependent on a variable of a process 1 is produced by a measuring device 5 and applied to a digital computer 6 which calculates any necessary correction of the variable, e.g. by comparing its magnitude with a desired value, and periodically operates a relay 10, 8 so that a condenser 9 is alternately charged to the correction voltage and connected to an operational amplifier 4 having capacitive feedback the output of which operates a device 2 correcting the process variable. The signal from measuring device 5 is also applied through an impedance 7 to amplifier 4 so as to anticipate changes in the correcting voltage from computer 6 in the intervals before such changes become effective. Network 7 which blocks the D.C. component, includes capacity and is chosen to provide optimum anticipation. In proportional plus integral control, the proportional component may be provided through impedance 7 and the integral component through computer 6. If the computer fails or is rendered ineffective by automatic or manual operation of a switch 11, the signal applied through impedance 7 provides emergency control. Overriding manual control of the variable may be produced by operation of switches 12 and 13 to apply signals of appropriate polarity to amplifier 4. In a modification, impedance 7 is disconnected from amplifier 4 and a feedback resistor connected to amplifier 4 each time the signal from computer 6 is applied directly to amplifier 4.
GB5146868A 1967-11-01 1968-10-30 Control of a process variable with the aid of a computer Expired GB1235519A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6714829A NL158301C (en) 1967-11-01 1967-11-01 SYSTEM FOR AUTOMATIC CONTROL OF A PROCESS.

Publications (1)

Publication Number Publication Date
GB1235519A true GB1235519A (en) 1971-06-16

Family

ID=19801603

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5146868A Expired GB1235519A (en) 1967-11-01 1968-10-30 Control of a process variable with the aid of a computer

Country Status (4)

Country Link
DE (1) DE1806179A1 (en)
FR (1) FR1590366A (en)
GB (1) GB1235519A (en)
NL (1) NL158301C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2336983A1 (en) * 1973-07-20 1975-02-06 Bbc Brown Boveri & Cie CONTROL CIRCUIT FOR ADJUSTING THE OUTPUT VOLTAGE OF AN I- OR PI CONTROL AMPLIFIER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2336983A1 (en) * 1973-07-20 1975-02-06 Bbc Brown Boveri & Cie CONTROL CIRCUIT FOR ADJUSTING THE OUTPUT VOLTAGE OF AN I- OR PI CONTROL AMPLIFIER

Also Published As

Publication number Publication date
NL158301C (en) 1979-09-17
FR1590366A (en) 1970-04-13
DE1806179A1 (en) 1969-06-26
NL6714829A (en) 1969-05-05
NL158301B (en) 1978-10-16

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