EP2244235A1 - Selbstregulierungsverfahren eines Alarmsirenenmoduls für Kraftfahrzeug - Google Patents

Selbstregulierungsverfahren eines Alarmsirenenmoduls für Kraftfahrzeug Download PDF

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Publication number
EP2244235A1
EP2244235A1 EP09158403A EP09158403A EP2244235A1 EP 2244235 A1 EP2244235 A1 EP 2244235A1 EP 09158403 A EP09158403 A EP 09158403A EP 09158403 A EP09158403 A EP 09158403A EP 2244235 A1 EP2244235 A1 EP 2244235A1
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EP
European Patent Office
Prior art keywords
frequency
siren
signal
values
transducer
Prior art date
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Granted
Application number
EP09158403A
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English (en)
French (fr)
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EP2244235B1 (de
Inventor
Bruno Tessier
Benoit Ferreira
Jean-Marie Carvalho
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Delphi Technologies Inc
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Delphi Technologies Inc
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Priority to EP20090158403 priority Critical patent/EP2244235B1/de
Publication of EP2244235A1 publication Critical patent/EP2244235A1/de
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Publication of EP2244235B1 publication Critical patent/EP2244235B1/de
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    • 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

Definitions

  • the present invention relates to a siren and a method of controlling a siren. More particularly, the present invention relates to vehicle alarm sirens.
  • an anti-theft alarm siren to warn people in the vicinity of a parked car that an abnormal situation is detected, such as a major shock, breakage of glass, or an attempt to pick a lock. door.
  • the sound power of the siren must be both high enough to be heard from a relatively large distance, and low enough not to affect the safety and well-being of nearby people, that is, to say to respect constraints of public health and public order.
  • the sound signal emitted by the siren must be identifiable, that is to say, it must be able to distinguish it from other sounds that may be emitted in the automobile environment, for example the sound of a horn or the sound Warning signal of a truck traveling in reverse.
  • the European Directive 95/56 EC standardises alarm systems for vehicles by imposing constraints on the sound power and on the different types of signals that can be transmitted, among which are the signals of the frequency-modulated type.
  • the directive requires a continuous and uniform sound, except for the equal passage of a large frequency range in the range 1850Hz to 3550Hz in both directions, with a frequency of change from 1 to 3 Hz.
  • such signals therefore have a period of 0.33 to 1 second comprising a first portion in which the instantaneous frequency increases so as to go from 1850 Hz to 3550 Hz, a second portion at 3550 Hz, a third portion in which the instantaneous frequency decreases so as to change from 3550Hz to 1850Hz and a fourth portion to 1850Hz.
  • This type of signal is identified by users as coming from a vehicle alarm siren.
  • a signal generator produces an output signal which, when amplified, transformed and applied to a piezoelectric crystal, produces a sound signal in accordance with the requirements of Directive 95/56 EC, which the manufacturers of automobiles and users identify as being that of a vehicle alarm siren.
  • the output signal of the generator is a square wave whose instantaneous frequency varies according to a periodic pattern.
  • Curve 40 of the figure 1 represents the evolution of the instantaneous frequency of the output signal conventionally generated, during a period. In the portion 41, the instantaneous frequency increases from 1850Hz to 3550Hz. Then in the portion 42, the instantaneous frequency remains constant at 3550Hz.
  • the frequency decreases from 3550Hz to 1850Hz and finally in the portion 44 it remains constant at 2000Hz.
  • Each portion has a duration of 125 ms, the period being 500 ms.
  • the curve 70 of FIG. 7 represents the envelope of the measurement curve of the corresponding acoustic pressure.
  • the sound pressure reached is of the order of 6 Pa.
  • the directive requires that the sound pressure measured at 2 meters against the siren in anechoic medium be at least 100dB (A) and 118dB (A) maximum.
  • the minimum level of 100dB (A) at each moment of the cycle is difficult to reach, especially with the sirens comprising a piezoelectric crystal.
  • EP 1 653 420 a method for controlling the sound power of a siren, the sound signal of which can be identified by the informed public as that of a vehicle alarm siren.
  • the method of controlling a siren comprising a sound production device comprising a transducer capable of emitting a sound signal in response to an electrical control signal, comprises generating an electrical control signal whose instantaneous frequency remains in a predefined frequency range, the control signal comprising at least a rising frequency signal portion 51 whose instantaneous frequency increases, at least a down-frequency signal portion 53 whose instantaneous frequency decreases and at least a portion of constant-frequency signal 52, 54 whose instantaneous frequency is equal to a resonance frequency of the sound producing device or a sub-multiple of the resonant frequency.
  • the resonance frequency of the sound producing device makes it possible to increase the sound power of the siren.
  • the acoustic signal emitted according to this method remained identifiable by the users as being that of a vehicle alarm siren, without significant differences in perception compared to conventional sirens.
  • the sound power of the sound signal varies with the frequency of the signal applied to the transducer 9.
  • figure 2 illustrates this dependency.
  • Curve 30 gives the frequency response of the sound producing device, and presents one or more local maxima 32.
  • the resonance frequency of the sound producing device is called a frequency corresponding to the maximum or one of the maxima of the response curve.
  • the microcontroller In the siren according to the prior art, the microcontroller generates a periodic control signal whose variation of the instantaneous frequency during a period 56 is represented by the curve 50 of the figure 3 .
  • the instantaneous frequency In the portion 51 of duration equal to the transit time t rise, the instantaneous frequency increases from a minimum frequency f min of 1850Hz to a maximum frequency f max of 3550Hz. Then in the portion 51 of duration equal to the hold time t high , the instantaneous frequency remains constant, equal to the stationary frequency f stat which is the resonance frequency of the sound production device.
  • the frequency decreases from f max to f min and finally in the portion 54 of duration equal to the time of maintaining t low it is again constant and equal f stat .
  • the rise time t and t fall is 100 ms.
  • the times t high and t low are 150 ms.
  • the period is 500 ms.
  • the audible signal corresponding to this output signal complies with the requirements of Directive 95/56 EC. Due to the portions 52 and 54 at the resonance frequency, the average sound power of the siren 1 is greater than with the control signal of the figure 1 .
  • An object of the present invention is to meet the drawbacks mentioned above by providing a method of self-calibration of a siren so that the sound signal that it emits is adapted to the environment in which it is located.
  • a first aspect of the present invention relates to a method of self-calibration of a siren comprising a transducer able to emit a sound signal in response to an electrical control signal, characterized in that the method comprises the steps (i) controlling the instantaneous frequency of the electrical control signal comprising at least a rising frequency signal portion whose instantaneous frequency increases and at least a down-frequency signal portion whose instantaneous frequency decreases; (ii) measuring the voltage generated at the terminals of the transducer; (iii) detecting a voltage extremum in a predefined range of frequency values for determining an in situ resonance frequency of the siren for that range of values; and (iv) modifying the control parameters of the instantaneous frequency of the electrical control signal so that it further comprises at least a constant frequency signal portion whose instantaneous frequency is equal to the in situ resonance frequency of the siren or at a sub-multiple of this resonance frequency in situ.
  • the range of frequency values is determined between 1850 KHz and 3550 KHz.
  • the range of frequency values is determined by the vehicle manufacturer or the equipment manufacturer so as to obtain a siren sound close to those usually perceived.
  • the present invention relates to a siren comprising a transducer capable of emitting a sound signal in response to an electrical control signal, the said siren comprising a self-calibration system able to control the instantaneous frequency of the control signal.
  • an electrical circuit comprising at least a rising frequency signal portion in the instantaneous frequency and at least a downconverting signal portion whose instantaneous frequency decreases; measuring one or more electrical parameters (voltage, current, impedance ...) generated at the transducer; detecting an extremum of one or more of these parameters within a predefined range of frequency values for determining an in situ resonance frequency of the siren for that range of values; and modifying the control parameters of the instantaneous frequency of the electrical control signal, so as to further comprise at least one constant-frequency signal portion whose instantaneous frequency is equal to the siren's in-situ resonance frequency or to a sub-multiple of this resonance frequency in situ.
  • the siren used in the context of the present invention is preferably a siren similar to that described in relation to the Figures 1 and 2 from the previous document EP 1 653 420 , whose description of the siren is incorporated herein by reference.
  • FIG 4 is represented a graph showing the offset of the resonance frequency of the acoustic pressure of the transducer of the same siren under the influence of its environment.
  • the maximum value intended to determine the resonant frequency (f R1, f R2) of the transducer mounted in the siren substantially varies in the range of values defined in the directive 95/56 EC, namely between 1850 Hz and 3550 Hz under the influence of the environment in which the siren is placed.
  • the curves in this figure show that under these conditions of measurement, depending on the environment, the resonance frequency at 3300hz ( f R2 ) is not optimal; this frequency ( f R2 ) turns out however to be the effective frequency in a first environment depending for example on the location of the transducer under the hood of the vehicle. At its final location or after a modification of its environment, the frequency ( f R1 ) becomes the resonant frequency to be retained and this is done using the methodology described in this patent. This 50 Hz automatic glide in the control system is enough to increase the level of 2 dB, which is very useful to stay in the conditions required by the directive.
  • the figure 5 is a graph showing an example of the evolution of the acoustic pressure Pa with respect to the voltage measured across the transducer of the siren.
  • electrical parameters such as the voltage, the current and the impedance measured at the level of the siren transducer, for example, the minimum voltage detected V min , provide a true image of the maximum sound pressure Pa max of the siren, more particularly the maximum sound pressure for determining the so-called resonance frequency f R independently of the environment of the siren.
  • An object of the present invention is to be able to calibrate the resonance frequency of the siren independently of the environment in which it is located. For this, it has been implemented a method of self-calibration of the siren shown schematically in the figure 6 , making it possible to determine the resonant frequency according to the environment more precisely than the previously used method.
  • the self-calibration method comprises the following steps. After installation of the siren on the vehicle for which it is intended, it is expected an initialization of the siren. During this step (i) of initialization of the siren, piloting, preferably, without a landing is generated by the siren.
  • This control of the instantaneous frequency of the electrical control signal comprises a rising frequency signal portion whose instantaneous frequency increases and / or a down-frequency signal portion whose instantaneous frequency decreases. It is important to note that this initialization step is performed on a functioning siren installed on a vehicle so as to be in its environment.
  • the frequency variations are performed within a predetermined range of values.
  • the value range is between 1850 Hz and 3550 Hz so as to meet the requirements of the Directive 95/56 EC. Nevertheless, this range of values may be determined by the vehicle manufacturer or the supplier supplier of the siren so that the selected resonant frequency causes the sound to be generated by the siren at the convenience of the users of the system.
  • one or more electrical parameters of the siren are measured at the level of the piezoelectric transducer of the siren which are the image of the acoustic pressure, in particular with regard to the extrema.
  • the values of the measured electrical parameters are stored in correspondence of the frequency for which a value is measured.
  • a frequency pointer makes it possible to detect the frequency corresponding to the value of the measured extremal parameter (s), for example the lowest voltage.
  • the resonant frequency f R in situ of the siren that is to say as installed in the vehicle or more generally as installed in its final environment.
  • the stored values correspond to the values measured in the predefined range of values during initial piloting.
  • the in situ resonance frequency retained will be that corresponding to the extrema of the measured parameter (s), the lowest value in this range. regarding the voltage.
  • a new piloting parameter incorporating a step at this frequency is programmed in a fourth step (iv) instead of the initial piloting, so that the following control generated further comprises a portion of constant frequency signal, also called bearing frequency, whose instantaneous frequency is equal to the resonance frequency f R in situ of the siren determined by means of the self-calibration process.
  • a period of the output signal may contain more than a rising frequency portion and more than a downward frequency portion. These portions may be in regular or irregular staircase. They may also not be stepped but have a continuous variation of the instantaneous frequency, if the control signal generator is capable of generating such a signal.
  • the output signal is not necessarily periodic.
  • it can present a diagram of variation of the instantaneous frequency being repeated with small differences.
  • the frequency is not necessarily equal to the resonant frequency. It can be a submultiple, the sound producing device then being resonantly excited by a harmonic of the control signal.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
EP20090158403 2009-04-21 2009-04-21 Selbstregulierungsverfahren eines Alarmsirenenmoduls für Kraftfahrzeug Active EP2244235B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20090158403 EP2244235B1 (de) 2009-04-21 2009-04-21 Selbstregulierungsverfahren eines Alarmsirenenmoduls für Kraftfahrzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20090158403 EP2244235B1 (de) 2009-04-21 2009-04-21 Selbstregulierungsverfahren eines Alarmsirenenmoduls für Kraftfahrzeug

Publications (2)

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EP2244235A1 true EP2244235A1 (de) 2010-10-27
EP2244235B1 EP2244235B1 (de) 2014-08-13

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1369185A2 (de) * 2002-06-04 2003-12-10 Coltene/Whaledent, Inc. Vorrichtung zum Antreiben eines Ultraschallwandlers mit einer optimalen Frequenz
EP1653420A1 (de) 2004-10-27 2006-05-03 Delphi Technologies, Inc. Warnsirene für Fahrzeug

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1369185A2 (de) * 2002-06-04 2003-12-10 Coltene/Whaledent, Inc. Vorrichtung zum Antreiben eines Ultraschallwandlers mit einer optimalen Frequenz
EP1653420A1 (de) 2004-10-27 2006-05-03 Delphi Technologies, Inc. Warnsirene für Fahrzeug

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