EP1251474A1 - Capteur à connexion bifilaire utilisant la modulation d'impulsions en largeur - Google Patents

Capteur à connexion bifilaire utilisant la modulation d'impulsions en largeur Download PDF

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Publication number
EP1251474A1
EP1251474A1 EP02007440A EP02007440A EP1251474A1 EP 1251474 A1 EP1251474 A1 EP 1251474A1 EP 02007440 A EP02007440 A EP 02007440A EP 02007440 A EP02007440 A EP 02007440A EP 1251474 A1 EP1251474 A1 EP 1251474A1
Authority
EP
European Patent Office
Prior art keywords
pulse width
wire sensor
signal
pwm
physical quantity
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.)
Granted
Application number
EP02007440A
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German (de)
English (en)
Other versions
EP1251474B1 (fr
Inventor
Lothar Dipl.-Phys. Blossfeld
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.)
TDK Micronas GmbH
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TDK Micronas GmbH
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Publication date
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Publication of EP1251474A1 publication Critical patent/EP1251474A1/fr
Application granted granted Critical
Publication of EP1251474B1 publication Critical patent/EP1251474B1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/22—Electric signal transmission systems in which transmission is by pulses by varying the duration of individual pulses

Definitions

  • the invention relates to a method for measuring a physical Size using a two-wire sensor.
  • the invention further relates to a two-wire sensor for measurement a physical quantity.
  • Two-wire sensors are made of a measuring sensor, which is a physical Size such as B. the temperature, the pressure or the Measures field strength of a magnetic field, and electronic components for processing the signals supplied by the measuring sensor built up. Both the power supply and the forwarding the measured and processed measurement signals take place via only two lines, which gives the name two-wire sensor is. A two-wire sensor therefore only has two connections, the same time the power supply and forwarding serve the measured and processed measurement signals.
  • Two-wire sensors are e.g. B. as a contactless magnetic Switch executed depending on the strength and direction of the measuring magnetic field as a measurement signal z.
  • B. a stream of different Deliver strength.
  • the component is seen from the outside passive, in the simplest case (the current / voltage characteristic may change in other ways) his inner resistance. With current impressions changes the voltage that can be tapped and the resulting voltage Electricity. Both can (also in combination) as a signal be evaluated on the recipient side.
  • Two-wire sensors are used e.g. B. in motor vehicles as a buckle switch or position switch used. Become two-wire sensors used in safety-relevant areas, high reliability is required. In particular, a defective or faulty two-wire sensor in time be recognized.
  • a pulse width modulated Errors and faulty functions can be generated to generate signal easily detect the two-wire sensor, because with one The two-wire sensor does not generate a pulse-width-modulated error Signal more.
  • An embodiment of the invention provides the pulse width the measurement signals generated by the two-wire sensor depending modulate from the physical quantity to be measured.
  • a Failure or malfunction of the two-wire sensor caused by a Error signal with a specifiable pulse width is displayed.
  • the pulse width ratio of the error signal 1: 1 is displayed.
  • Size measurement signals with asymmetrical pulse width ratios to get voted is displayed.
  • Different pulse width ratios cannot only represent the physical quantity to be measured, rather can also be determined by different pulse width ratios display other information from the two-wire sensor.
  • An exemplary embodiment provides only two values or states the invention, the first value or state by a first measurement signal with a first predeterminable pulse width to represent and the second value or the second state to represent by a second measurement signal, which by inverting of the first measurement signal is generated.
  • FIG 1 shows an embodiment of an inventive Two-wire sensor shown.
  • the one connection of the two-wire sensor S, to which the pulse width modulated signal PWM is tapped via a resistor R is supplied with a supply voltage V.
  • the other connection of the two-wire sensor S is grounded.
  • FIG. 2 shows a pulse width modulated signal with a pulse width ratio Th: Tp of 1: 4 and dashed lines of 1: 2.
  • the rise time Trp and the fall time Tfp of the pulses of the pulse width modulated signal are chosen so that they satisfy the following inequalities: Trp ⁇ Tp ⁇ Rp / 2 Tfp ⁇ Tp ⁇ Rp / 2 where Tp is the period of the pulse width modulated signal and Rp is the ratio of the shortest high level to the period of time Tp.
  • the pulse width modulated signal can e.g. B. by measuring the Pulse width ratio or by filtering using a Low pass can be evaluated.
  • the low pass filtering delivers a DC voltage value that determines the ratio high to low becomes.
  • the method according to the invention and the two-wire sensor according to the invention are especially for use in safety-relevant Suitable areas because of errors or malfunctions of the two-wire sensor are easily detectable.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
EP02007440A 2001-04-20 2002-03-30 Capteur à connexion bifilaire utilisant la modulation d'impulsions en largeur Expired - Lifetime EP1251474B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10119471A DE10119471A1 (de) 2001-04-20 2001-04-20 Verfahren und Zweidrahtsensor zur Messung einer physikalischen Größe
DE10119471 2001-04-20

Publications (2)

Publication Number Publication Date
EP1251474A1 true EP1251474A1 (fr) 2002-10-23
EP1251474B1 EP1251474B1 (fr) 2005-02-09

Family

ID=7682146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02007440A Expired - Lifetime EP1251474B1 (fr) 2001-04-20 2002-03-30 Capteur à connexion bifilaire utilisant la modulation d'impulsions en largeur

Country Status (3)

Country Link
US (1) US7124655B2 (fr)
EP (1) EP1251474B1 (fr)
DE (2) DE10119471A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011057904A1 (fr) * 2009-11-13 2011-05-19 Balluff Gmbh Système de détection, appareil de détection et appareil de diagnostic
EP3056866A1 (fr) * 2015-02-11 2016-08-17 Melexis Technologies NV Rapport de diagnostic des circuits intégrés dans un capteur

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DE10145520B4 (de) * 2001-09-14 2004-09-09 Vega Grieshaber Kg Schaltungsanordnung zur Spannungsversorgung eines Zweidrahtsensors
JP3632657B2 (ja) * 2001-12-20 2005-03-23 トヨタ自動車株式会社 電圧変換装置
US9453691B2 (en) 2007-08-09 2016-09-27 Coolit Systems, Inc. Fluid heat exchange systems
US9496200B2 (en) 2011-07-27 2016-11-15 Coolit Systems, Inc. Modular heat-transfer systems
US8054071B2 (en) 2008-03-06 2011-11-08 Allegro Microsystems, Inc. Two-terminal linear sensor
WO2010083877A1 (fr) 2009-01-24 2010-07-29 Ebm-Papst St. Georgen Gmbh & Co. Kg Moteur électrique et dispositif de génération d'un signal destiné à la commande dudit moteur
US8405534B2 (en) * 2009-10-21 2013-03-26 Asahi Kasei Microdevices Corporation Two-wire transmitter
FR2966241A1 (fr) * 2010-10-19 2012-04-20 Peugeot Citroen Automobiles Sa Capteur apte a determiner un dysfonctionnement interne et procede de diagnostic pour un tel capteur
US10365667B2 (en) * 2011-08-11 2019-07-30 Coolit Systems, Inc. Flow-path controllers and related systems
US8964360B2 (en) 2013-02-06 2015-02-24 Jonathan D. Trout System to connect and multiplex sensor signals
TWI531795B (zh) 2013-03-15 2016-05-01 水冷系統公司 感測器、多工通信技術及相關系統
DE102013209309A1 (de) * 2013-05-21 2014-11-27 Zf Friedrichshafen Ag Verfahren und Schaltung zur Bewertung pulsweitenmodulierter Signale
DE102016107808B4 (de) 2016-04-27 2022-03-31 Tdk-Micronas Gmbh Verfahren und Anordnung zur Überwachung eines Zustands
DE102017119575A1 (de) 2017-08-25 2019-02-28 Tdk-Micronas Gmbh Verfahren zur Programmierung eines Zweidrahtsensors und ein programmierbarer Zweidrahtsensor
US11662037B2 (en) 2019-01-18 2023-05-30 Coolit Systems, Inc. Fluid flow control valve for fluid flow systems, and methods
US11473860B2 (en) 2019-04-25 2022-10-18 Coolit Systems, Inc. Cooling module with leak detector and related systems
US11395443B2 (en) 2020-05-11 2022-07-19 Coolit Systems, Inc. Liquid pumping units, and related systems and methods
US11725886B2 (en) 2021-05-20 2023-08-15 Coolit Systems, Inc. Modular fluid heat exchange systems

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DE2701184A1 (de) * 1977-01-13 1978-07-27 Endress Hauser Gmbh Co Schaltungsanordnung zur uebertragung von messwertsignalen
EP0037502A1 (fr) * 1980-04-08 1981-10-14 Licentia Patent-Verwaltungs-GmbH Système à capteur
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DE3330904A1 (de) * 1983-08-25 1985-03-07 Siemens AG, 1000 Berlin und 8000 München Messwertuebertragungssystem
US4695840A (en) * 1985-09-03 1987-09-22 Mobil Oil Corporation Remote switch position determination using duty cycle modulation
EP0501771A1 (fr) * 1991-02-25 1992-09-02 Nihon Protech System Co., Ltd. Système de transmission d'information
DE19650935A1 (de) * 1996-12-07 1998-06-10 Teves Gmbh Alfred Verfahren und Schaltungsanordnung zur Übertragung von Drehzahlinformationen und Zusatzdaten

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EP0037502A1 (fr) * 1980-04-08 1981-10-14 Licentia Patent-Verwaltungs-GmbH Système à capteur
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DE3330904A1 (de) * 1983-08-25 1985-03-07 Siemens AG, 1000 Berlin und 8000 München Messwertuebertragungssystem
US4695840A (en) * 1985-09-03 1987-09-22 Mobil Oil Corporation Remote switch position determination using duty cycle modulation
EP0501771A1 (fr) * 1991-02-25 1992-09-02 Nihon Protech System Co., Ltd. Système de transmission d'information
DE19650935A1 (de) * 1996-12-07 1998-06-10 Teves Gmbh Alfred Verfahren und Schaltungsanordnung zur Übertragung von Drehzahlinformationen und Zusatzdaten

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011057904A1 (fr) * 2009-11-13 2011-05-19 Balluff Gmbh Système de détection, appareil de détection et appareil de diagnostic
EP3056866A1 (fr) * 2015-02-11 2016-08-17 Melexis Technologies NV Rapport de diagnostic des circuits intégrés dans un capteur
US9652905B2 (en) 2015-02-11 2017-05-16 Melexis Technologies Nv Diagnostic reporting for sensor integrated circuits

Also Published As

Publication number Publication date
US20020153885A1 (en) 2002-10-24
DE50202193D1 (de) 2005-03-17
US7124655B2 (en) 2006-10-24
EP1251474B1 (fr) 2005-02-09
DE10119471A1 (de) 2002-10-31

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