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GB2065331A - Signal converting unit intended to be incorporated in a pneumatic control system - Google Patents

Signal converting unit intended to be incorporated in a pneumatic control system

Info

Publication number
GB2065331A
GB2065331A GB8105536A GB8105536A GB2065331A GB 2065331 A GB2065331 A GB 2065331A GB 8105536 A GB8105536 A GB 8105536A GB 8105536 A GB8105536 A GB 8105536A GB 2065331 A GB2065331 A GB 2065331A
Authority
GB
United Kingdom
Prior art keywords
signal
unit
control signal
piezoelectric element
voltage
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.)
Withdrawn
Application number
GB8105536A
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.)
Saab AB
Original Assignee
Saab Scania AB
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 Saab Scania AB filed Critical Saab Scania AB
Publication of GB2065331A publication Critical patent/GB2065331A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B5/00—Transducers converting variations of physical quantities, e.g. expressed by variations in positions of members, into fluid-pressure variations or vice versa; Varying fluid pressure as a function of variations of a plurality of fluid pressures or variations of other quantities
    • F15B5/003—Transducers converting variations of physical quantities, e.g. expressed by variations in positions of members, into fluid-pressure variations or vice versa; Varying fluid pressure as a function of variations of a plurality of fluid pressures or variations of other quantities characterised by variation of the pressure in a nozzle or the like, e.g. nozzle-flapper system
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Paper (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

The unit serves to convert an electrical control signal (I) received at the input of the unit into a pneumatic signal (P). This is emitted at the output of the unit and its value should be proportional to the value of the control signal (I). The unit comprises a tongue-shaped piezoelectric element (6) which is loaded with a voltage dependent on the control signal, so that the element (6) carries out a lateral bending movement which varies with the voltage. The unit also comprises a pneumatic line (1) with a chamber (1a) which is supplied with compressed air via a throttle (4) and from which the compressed air is conducted through a nozzle (3) located near to one side of the piezoelectric element (6) so that the air pressure in the chamber is regulated by the piezoelectric element (6) as a function of the said voltage; and an outlet line (5) leading from the chamber for transmitting the regulated air pressure to the control system as the said pneumatic signal (P). To make the pneumatic signal (P) to the control system accurately follow the electrical control signal (1), a pressure transducer (7) is connected to the outlet line (5), being designed to produce an electrical signal (T) which corresponds to the regulated air pressure, and which is fed back via a feed-back circuit to the input of the unit. Furthermore, the input has a circuit (9, 11) which receives both the electrical control signal (1) and the fed-back electrical signal (T). The circuit has a device (9) for forming a difference signal by comparing the two signals (I, T) and a device (11) for integrating the difference signal and thereafter producing from the integrated difference signal the voltage with which the piezoelectric element (6) is loaded.
GB8105536A 1979-03-01 1980-02-29 Signal converting unit intended to be incorporated in a pneumatic control system Withdrawn GB2065331A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7901841A SE420639B (en) 1979-03-01 1979-03-01 SIGNAL CONVERTER UNIT FOR CONVERTING AN ELECTRICAL CONTROL SIGNAL TO A PNEUMATIC SIGNAL WITH A PIEZOELECTRIC ELEMENT

Publications (1)

Publication Number Publication Date
GB2065331A true GB2065331A (en) 1981-06-24

Family

ID=20337424

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8105536A Withdrawn GB2065331A (en) 1979-03-01 1980-02-29 Signal converting unit intended to be incorporated in a pneumatic control system

Country Status (10)

Country Link
EP (1) EP0024409A1 (en)
AT (1) ATA901680A (en)
CH (1) CH646230A5 (en)
DE (1) DE3034326C2 (en)
DK (1) DK150278B (en)
GB (1) GB2065331A (en)
NL (1) NL8020072A (en)
NO (1) NO803279L (en)
SE (1) SE420639B (en)
WO (1) WO1980001826A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137776A (en) * 1983-03-28 1984-10-10 Edison Int Inc Signal converting system
US4527583A (en) * 1983-07-12 1985-07-09 Dresser Industries, Inc. Electropneumatic transducer system
US4665938A (en) * 1986-09-30 1987-05-19 Rosemount Inc. Frequency feedback on a current loop of a current-to-pressure converter
USRE33028E (en) * 1983-07-12 1989-08-22 Dresser Industries, Inc. Electropneumatic transducer system

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0102528A3 (en) * 1982-08-16 1984-05-09 The Perkin-Elmer Corporation Voltage to pressure transducer
AT380934B (en) * 1983-01-13 1986-07-25 Enfo Grundlagen Forschungs Ag ELECTRICAL-PNEUMATIC SIGNAL CONVERTER
GB8301053D0 (en) * 1983-01-14 1983-02-16 Vickers Plc Relief valve assembly
US4509547A (en) * 1983-02-22 1985-04-09 The Babcock & Wilcox Company Control system for an electro-pneumatic converter
BR8400626A (en) * 1983-02-24 1984-10-02 Babcock & Wilcox Co PNEUMATIC AUXILIARY ASSEMBLY FOR AN ELECTRICAL-PNEUMATIC CONVERTER
JPS61173319A (en) * 1985-01-26 1986-08-05 Shoketsu Kinzoku Kogyo Co Ltd Regulator for fluid
DE3532367A1 (en) * 1985-09-11 1987-03-19 Gulde Regelarmaturen Gmbh & Co PNEUMATIC REGULATOR
AT393174B (en) * 1989-05-19 1991-08-26 Enfo Grundlagen Forschungs Ag SIGNAL CONVERTER
JPH072029B2 (en) * 1989-06-26 1995-01-11 セイコー電子工業株式会社 Ultrasonic motor
GB9105341D0 (en) * 1991-03-13 1991-04-24 Watson Smith Ltd I/p converters
DE4240802C2 (en) * 1992-12-01 1997-07-17 Hartmann & Braun Ag Electropneumatic converter
GB9611147D0 (en) * 1996-05-29 1996-07-31 Flight Refueling Ltd A flapper valve

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1183778A (en) * 1956-09-28 1959-07-13 Thomson Houston Comp Francaise Piezoelectric crystal transducer for controlling hydraulic valves
US3456669A (en) * 1966-10-20 1969-07-22 Fisher Governor Co Piezoelectric transducer
US3882881A (en) * 1973-01-12 1975-05-13 American Chain & Cable Co Pneumatic transmitter of electrical phenomena
DE2523600A1 (en) * 1975-05-28 1976-12-09 Bosch Gmbh Robert ELECTROHYDRAULIC CONTROL DEVICE
GB1551039A (en) * 1976-08-06 1979-08-22 Ici Ltd Conversion of electric to pneumatic signals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137776A (en) * 1983-03-28 1984-10-10 Edison Int Inc Signal converting system
US4492246A (en) * 1983-03-28 1985-01-08 Mcgraw-Edison Company Solid state current-to-pressure and current-to-motion transducer
US4527583A (en) * 1983-07-12 1985-07-09 Dresser Industries, Inc. Electropneumatic transducer system
USRE33028E (en) * 1983-07-12 1989-08-22 Dresser Industries, Inc. Electropneumatic transducer system
US4665938A (en) * 1986-09-30 1987-05-19 Rosemount Inc. Frequency feedback on a current loop of a current-to-pressure converter

Also Published As

Publication number Publication date
DE3034326T1 (en) 1981-04-09
SE7901841L (en) 1980-09-02
DK150278B (en) 1987-01-26
NO803279L (en) 1980-10-31
DE3034326C2 (en) 1983-11-17
CH646230A5 (en) 1984-11-15
NL8020072A (en) 1981-04-29
ATA901680A (en) 1986-05-15
EP0024409A1 (en) 1981-03-11
WO1980001826A1 (en) 1980-09-04
SE420639B (en) 1981-10-19
DK462080A (en) 1980-10-31

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)