GB2368981A - Device for activating a siren and for monitoring a controller to ensure a fault in the controller does not cause the siren to activate - Google Patents

Device for activating a siren and for monitoring a controller to ensure a fault in the controller does not cause the siren to activate Download PDF

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Publication number
GB2368981A
GB2368981A GB0117897A GB0117897A GB2368981A GB 2368981 A GB2368981 A GB 2368981A GB 0117897 A GB0117897 A GB 0117897A GB 0117897 A GB0117897 A GB 0117897A GB 2368981 A GB2368981 A GB 2368981A
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GB
United Kingdom
Prior art keywords
siren
microcontroller
protocol
fault
control unit
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
GB0117897A
Other versions
GB0117897D0 (en
GB2368981B (en
Inventor
Joachim Schenk
Achim Mahler
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB0117897D0 publication Critical patent/GB0117897D0/en
Publication of GB2368981A publication Critical patent/GB2368981A/en
Application granted granted Critical
Publication of GB2368981B publication Critical patent/GB2368981B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/10—Monitoring of the annunciator circuits
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K7/00—Sirens

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Computer Security & Cryptography (AREA)
  • Alarm Systems (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

A device for activating a siren 10 having a control unit 14 containing a microcontroller 16 which communicates with siren 10 via a data circuit 12. The siren 10 generates an alarm when communication via the data circuit 12 is interrupted. Monitoring means 18 is provided to monitor the microcontroller 16 and in the event of a fault in the microcontroller 16 ensure that communication with the siren 10 continues.

Description

- 1 Device for activating a siren Prior art
The invention is based on a device for activating a siren according to the preamble of the independent claim. A siren unit is already known from WO 95/16248. A serial communications line is located between the siren and a siren 5 control unit. As long as the siren receives suitable, cyclical data packets without transmission of an alarm command, it is not activated. If communication between siren and control unit is interrupted, the absent data cause the siren to be activated. If, due to a faulty component, 10 the control unit no longer sends suitable data, the siren is activated even if there is no situation to trigger the alarm. The object of the invention is therefore to minimise the number of false alarms.
15 This object is achieved by the features of the independent claim. Advantages of the invention 20 The device according to the invention for activating a siren contains a control unit which includes a microcontroller that communicates with a siren via at least one data circuit. This siren then generates an alarm if
- 2 communication via the data circuit is interrupted.
According to the invention, monitoring means are provided which monitor the microcontroller and in the event of a fault in the microcontroller ensure that communication with 5 the siren continues. This ensures that a microcontroller fault, which would usually lead to the termination of the communication process between control unit and siren, does not cause the siren to trigger an alarm. This will prevent unnecessary noise pollution without any prior attempted 10 burglary. Provision is made in a practical development for a second microcontroller to be arranged in the control unit as monitoring means. The second microcontroller undertakes three tasks: firstly it monitors the fault condition of the first microcontroller. If the second microcontroller 15 detects a fault in the first, the second microcontroller forwards via the data circuit such data that prevents the siren from being activated. Thirdly, the second microcontroller acts in the quiescent state of the control unit to reduce the quiescent current and undertakes 20 communication during the quiescent state.
Provision is made in a practical development for the first microcontroller to transmit data to the siren within a first protocol, and the second microcontroller to transmit data to 25 the siren within a second protocol. The second protocol transmitted in the event of a fault has a simplified structure compared to the first protocol. Provided no alarm command is being transmitted, the second protocol prevents the activation of the siren. Due to the simplified second 30 protocol, the second microcontroller can be constructed as a relatively simple electronic component. For example, the second simplified protocol contains no fault information relating to the siren.
- 3 Further practical developments are revealed in the further dependent claims and the description.
Drawing An exemplary embodiment is illustrated in the drawing and is described below in further detail. Figure 1 shows a block diagram and Figure 2 a flowchart of the exemplary embodiment. Description of the exemplary embodiment
A siren 10 communicates with control unit 14 via a serial bus 12. The control unit 14 contains a first 15 microcontroller 16 and a second microcontroller 18. The second microcontroller 18 monitors the first microcontroller 16 for correct operation. First and second microcontrollers 16, 18 can output signals via a transceiver 20 to the serial bus 12 in order to communicate with the siren 10. The 20 control unit 14 is connected via a data bus 22 to an intruder sensor 24, for example.
In normal operation, the control unit 14 transmits data with a first protocol P1 to the siren 10 via the first 25 microcontroller 16, the transceiver 20 and the serial bus 12. The siren 10 monitors the cyclical transmitting process of the first protocol P1. If in this protocol P1 an alarm command reaches the siren 10, then the latter generates an audible warning signal for a predetermined time 30 period. The control unit 14 then generates an alarm command, for example, if the intruder sensor 24 reports an attempted burglary to the control unit 14 via the data bus system 22. The first microcontroller 16 evaluates this signal change, which characterizes a burglary, in the
- 4 intruder sensor 24 and immediately transmits an alarm signal to the siren 10 to activate it.
If during an attempted burglary the serial bus line 12 is 5 deliberately and forcibly cut, for example, the siren 10 no longer cyclically receives the first protocol P1. However, the siren 10 interprets this absence of cyclically transmitted data as a fault condition if data no longer arrive via the serial bus 12 within a predetermined time 10 period. The audible alarm generator is also activated in this case. In order to ensure the continuous readiness of the siren 10, it contains an auxiliary battery which is independent of the vehicle battery and which supplies alarm tone generator and the control electronics of 15 siren 10.
According to the invention, the second microcontroller 18 monitors the first microcontroller 16 for the occurrence of a fault. This could be achieved, for example, via 20 bidirectional communication between the two microcontrollers 16, 18. If the first microcontroller 16 does no react as expected to an interrogation signal from the second microcontroller 18, then the second microcontroller concludes that there is a fault in the first microconrr:.er 25 16. This monitoring takes place cyclically at short intervals. If the second microcontroller 18 detects a fault in the first microcontroller 16, the second microcontroller 18 undertakes communication with the siren 10. The second microcontroller 18 acts upon the transceiver 20 so that the 30 latter does not forward any signals from the first microcontroller 16 on the serial bus 12. Instead of the first protocol Pi, the second microcontroller 18 generates a second protocol P2 that reaches the siren 10 via the serial bus 12. The second protocol P2 can be made less complex
- 5 than the first protocol Pi. For example, the exchange of those data which indicate a fault condition in the siren or the auxiliary battery built into it, can be dispensed with.
Instead of the first microcontroller 16, the second 5 microcontroller 18 now evaluates the signal of the intruder sensor 24, which reaches the control unit 14 via the data bus 22. In the event of an attempted burglary, which the intruder sensor 24 detects, the second microcontroller 18 generates an alarm command that is transmitted to the siren 10 10 via the second protocol P2. If such an alarm command is present at the siren 10, it activates the audible signal tone generator. However, in the normal case this means that if no alarm command is transmitted, the siren 10 is not activated even if proper data communication is implemented 15 by the second protocol P2. If on the other hand, however, the serial bus 12 is cut and the siren 10 also detects the absence of data communication on the basis of the second protocol P2, activation takes place again.
20 In the quiescent state of the control unit 14, the second microcontroller 18 is operating to reduce the quiescent current. During the quiescent state of the control unit 14, the second microcontroller 18 undertakes communication with the siren 10 and/or the data bus 22.
The monitoring procedure of the second microcontroller 18 is illustrated in a simplified manner in Figure 2. After the control unit 14 has started, step 101, the second microcontroller 18 continuously monitors the first 30 microcontroller 16 for the presence of a fault, step 103.
If a fault is present, then the second microcontroller 18 transmits a simplified second protocol P2, step 105. This ends the monitoring procedure, step 107. But it continued on a cyclical basis.

Claims (10)

- 6 Claims
1. Device for activating a siren, having a control 5 unit (14) which contains a microcontroller (16) that communicates with a siren (10) via at least one data circuit (12), wherein the siren (10) generates an alarm when proper communication via the data circuit (12) is interrupted, characterized in that 10 monitoring means (18) are provided which monitor the microcontroller (16) and in the event of a fault in the microcontroller (16) ensure communication with the siren (10) via the data circuit (12).
15
2. Device according to Claim 1, characterized in that an additional microcontroller (18) is provided as monitoring means (18).
3. Device according to one of the preceding Claims, 20 characterized in that in the event of a fault in the first microcontroller (16), the additional microcontroller (18) undertakes communication with the siren (10) via the data circuit (12).
25
4. Device according to one of the preceding Claims, characterized in that a serial bus is used as data circuit (12).
À 7
5. Device according to one of the preceding Claims, characterized in that the first microcontroller (16) transmits a first protocol (P1) and the additional microcontroller (18) transmits a second protocol 5 (P2).
6. Device according to one of the preceding Claims, characterized in that the second protocol (P2) has a simplified structure compared to the first protocol 10 (P1).
7. Device according to one of the preceding Claims, characterized in that even with communication with a second protocol (P2) the siren (10) generates no alarm 15 provided no alarm command is transmitted in the second protocol (P2).
8. Device according to one of the preceding Claims, characterized in that in the quiescent state of the 20 control unit (14) the additional microcontroller (18) undertakes communication with the siren (10) and/or with a data bus (22) connected to the control unit (14). 25
9. Device according to one of the preceding Claims, characterized in that the additional microcontroller (18) is arranged in the control unit (14).
10. Device for activating a siren substantially as 30 hereinbefore described with reference to the accompanying drawing.
GB0117897A 2000-07-27 2001-07-23 Device for activating a siren Expired - Fee Related GB2368981B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2000136573 DE10036573C2 (en) 2000-07-27 2000-07-27 Anti-theft alarm system with a control unit for controlling a siren

Publications (3)

Publication Number Publication Date
GB0117897D0 GB0117897D0 (en) 2001-09-12
GB2368981A true GB2368981A (en) 2002-05-15
GB2368981B GB2368981B (en) 2003-04-16

Family

ID=7650385

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0117897A Expired - Fee Related GB2368981B (en) 2000-07-27 2001-07-23 Device for activating a siren

Country Status (3)

Country Link
DE (1) DE10036573C2 (en)
GB (1) GB2368981B (en)
SE (1) SE521562C2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2255435A1 (en) * 2004-11-19 2006-06-16 Jesus Olid Rubio Control system for activating and deactivating electrical devices in vehicles has controller that transmits registered data to electrical devices via output

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9641918B2 (en) 2012-08-24 2017-05-02 Nxp Usa, Inc. Audio unit and method for generating a safety critical audio signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06348528A (en) * 1993-06-11 1994-12-22 Hitachi Ltd Backup switching control method
JPH0729078A (en) * 1993-07-08 1995-01-31 Nohmi Bosai Ltd Fire alarm equipment
WO1995016248A1 (en) * 1993-12-06 1995-06-15 Robert Bosch Gmbh A siren unit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4375637A (en) * 1981-02-24 1983-03-01 Firecom, Inc. Integrated alarm, security, building management, and communications system
DE4032033A1 (en) * 1990-10-09 1992-04-16 Siemens Ag Electric control and monitoring for underground plant - triggering safety-relevant signals for transmission over independent paths and processing by redundant systems
DE4242973C2 (en) * 1992-12-18 1995-01-05 Grundig Emv Radio alarm system with a large number of message channels formed by the code multiplex method
DE4445465A1 (en) * 1994-12-20 1996-06-27 Reinhard Reimund Intruder alarm signal evaluation system
DE19540264A1 (en) * 1995-10-28 1997-04-30 Continental Ag Electronic control and regulating device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06348528A (en) * 1993-06-11 1994-12-22 Hitachi Ltd Backup switching control method
JPH0729078A (en) * 1993-07-08 1995-01-31 Nohmi Bosai Ltd Fire alarm equipment
WO1995016248A1 (en) * 1993-12-06 1995-06-15 Robert Bosch Gmbh A siren unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2255435A1 (en) * 2004-11-19 2006-06-16 Jesus Olid Rubio Control system for activating and deactivating electrical devices in vehicles has controller that transmits registered data to electrical devices via output

Also Published As

Publication number Publication date
GB0117897D0 (en) 2001-09-12
DE10036573C2 (en) 2002-06-27
SE0102585D0 (en) 2001-07-23
SE0102585L (en) 2002-01-28
GB2368981B (en) 2003-04-16
DE10036573A1 (en) 2002-03-07
SE521562C2 (en) 2003-11-11

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20080723