EP0327403A3 - Condition monitoring system - Google Patents

Condition monitoring system Download PDF

Info

Publication number
EP0327403A3
EP0327403A3 EP19890301112 EP89301112A EP0327403A3 EP 0327403 A3 EP0327403 A3 EP 0327403A3 EP 19890301112 EP19890301112 EP 19890301112 EP 89301112 A EP89301112 A EP 89301112A EP 0327403 A3 EP0327403 A3 EP 0327403A3
Authority
EP
European Patent Office
Prior art keywords
switch
terminal
signal
input signal
little
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Withdrawn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
EP19890301112
Other languages
German (de)
French (fr)
Other versions
EP0327403A2 (en
Inventor
Christopher James Brawn
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0327403A2 publication Critical patent/EP0327403A2/en
Publication of EP0327403A3 publication Critical patent/EP0327403A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H01H9/167—Circuits for remote indication

Abstract

A condition monitoring system for monitoring the condition of a two-position switch (SW), e.g. in a car or other vehicle, is arranged to provide selective drive signals to the switch and receive an input signal from the switch, the system responding to the received input signal (IN) to select which drive signal is applied to the switch so that little or no current is drawn from the system by the switch in either of its positions (A or B). Thus in the position shown, a low drive signal is applied to switch terminal (A) and a high drive signal is applied to terminal (B) and little or no current passes through the switch to its common terminal (C): however if the switch is changed to its other position a current passes through the switch from terminal (B) and a high input signal is applied at IN; in response to this the system charges the output drives to apply a high signal on terminal (A) and a low signal on terminal (B). In this manner little or no current is drawn by the switch in either of its positions, but at changeover a high input signal will flow until the monitoring system responds.
EP19890301112 1988-02-05 1989-02-03 Condition monitoring system Withdrawn EP0327403A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888802625A GB8802625D0 (en) 1988-02-05 1988-02-05 Condition monitoring system
GB8802625 1988-02-05

Publications (2)

Publication Number Publication Date
EP0327403A2 EP0327403A2 (en) 1989-08-09
EP0327403A3 true EP0327403A3 (en) 1990-12-05

Family

ID=10631148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890301112 Withdrawn EP0327403A3 (en) 1988-02-05 1989-02-03 Condition monitoring system

Country Status (2)

Country Link
EP (1) EP0327403A3 (en)
GB (1) GB8802625D0 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9600493D0 (en) 1996-01-11 1996-03-13 T M Products Ltd Switch status sensor
US6242821B1 (en) * 1999-06-07 2001-06-05 Visteon Global Technologies, Inc. CMOS passive input circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157296B (en) * 1959-04-21 1963-11-14 Bbc Brown Boveri & Cie Feedback and control arrangement for the switch position of a contactor or for the position of a mechanical device
EP0032694A1 (en) * 1980-01-21 1981-07-29 Siemens Aktiengesellschaft Arrangement for determining the position of a switch and for the control of the accompanying conductors for short- and open-circuit
DE3228686A1 (en) * 1982-07-31 1984-02-02 Edmund 7016 Gerlingen Zottnik Method and device for detecting switch positions
FR2536903A1 (en) * 1982-11-29 1984-06-01 Commissariat Energie Atomique Device for monitoring the state of a switch.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157296B (en) * 1959-04-21 1963-11-14 Bbc Brown Boveri & Cie Feedback and control arrangement for the switch position of a contactor or for the position of a mechanical device
EP0032694A1 (en) * 1980-01-21 1981-07-29 Siemens Aktiengesellschaft Arrangement for determining the position of a switch and for the control of the accompanying conductors for short- and open-circuit
DE3228686A1 (en) * 1982-07-31 1984-02-02 Edmund 7016 Gerlingen Zottnik Method and device for detecting switch positions
FR2536903A1 (en) * 1982-11-29 1984-06-01 Commissariat Energie Atomique Device for monitoring the state of a switch.

Also Published As

Publication number Publication date
EP0327403A2 (en) 1989-08-09
GB8802625D0 (en) 1988-03-02

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