JPS57168312A - Automatic digital pressure setting device - Google Patents

Automatic digital pressure setting device

Info

Publication number
JPS57168312A
JPS57168312A JP5321681A JP5321681A JPS57168312A JP S57168312 A JPS57168312 A JP S57168312A JP 5321681 A JP5321681 A JP 5321681A JP 5321681 A JP5321681 A JP 5321681A JP S57168312 A JPS57168312 A JP S57168312A
Authority
JP
Japan
Prior art keywords
pressure
value
tank
air
difference
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.)
Pending
Application number
JP5321681A
Other languages
Japanese (ja)
Inventor
Hiroomi Fujii
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5321681A priority Critical patent/JPS57168312A/en
Publication of JPS57168312A publication Critical patent/JPS57168312A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G05D16/2026—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 with a plurality of throttling means
    • G05D16/2046—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 with a plurality of throttling means the plurality of throttling means being arranged for the control of a single pressure from a plurality of converging pressures
    • G05D16/2053—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 with a plurality of throttling means the plurality of throttling means being arranged for the control of a single pressure from a plurality of converging pressures the plurality of throttling means comprising only a first throttling means acting on a higher pressure and a second throttling means acting on a lower pressure, e.g. the atmosphere

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Fluid Pressure (AREA)

Abstract

PURPOSE:To freely obtain the desired pressure value for a test of an air brake device, by reading the pressure value within a pressure tank by means of a pressure sensor and controlling the difference between the pressure value in the pressure tank and the set pressure value by means of a microprocessor. CONSTITUTION:The pressure value of a numerical command is set to a microprocessor muPC1, and at the same time the muPC1 reads the pressure value in a pressure tank 4 by means of a pressure sensor 5 attached to the tank 4 to calculate the difference between the measured value and the set value. When the difference is positive, an air supply solenoid 2b becomes conductive after energizing a coil 2a. The pressure air is supplied into the tank 4 from an air pressure source via an air supply throttle valve 6. The pressure in the tank 4 is measured again, and the coil 2a is energized. These operations are repeated, and as a result the pressure value is settled down in a certain range extremely close to the set value. In case the difference between the measured value and the set value is negative, a coil 3a of an exhaust solenoid 3b is energized to discharge the pressure air to the outside from the tank 4 through an exhaust throttle valve 7. Thus the measured value is set close to the set value.
JP5321681A 1981-04-10 1981-04-10 Automatic digital pressure setting device Pending JPS57168312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5321681A JPS57168312A (en) 1981-04-10 1981-04-10 Automatic digital pressure setting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5321681A JPS57168312A (en) 1981-04-10 1981-04-10 Automatic digital pressure setting device

Publications (1)

Publication Number Publication Date
JPS57168312A true JPS57168312A (en) 1982-10-16

Family

ID=12936631

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5321681A Pending JPS57168312A (en) 1981-04-10 1981-04-10 Automatic digital pressure setting device

Country Status (1)

Country Link
JP (1) JPS57168312A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59123910A (en) * 1982-12-29 1984-07-17 Daikin Ind Ltd Pressure controlling mechanism
JPS6454518A (en) * 1987-06-01 1989-03-02 Parker Hannifin Corp Air circuit pressure controller

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5324624A (en) * 1976-08-20 1978-03-07 Japan Steel Works Ltd:The Constant internal pressure keeping device for pressure container

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5324624A (en) * 1976-08-20 1978-03-07 Japan Steel Works Ltd:The Constant internal pressure keeping device for pressure container

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59123910A (en) * 1982-12-29 1984-07-17 Daikin Ind Ltd Pressure controlling mechanism
JPS6454518A (en) * 1987-06-01 1989-03-02 Parker Hannifin Corp Air circuit pressure controller

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