EP0654768A1 - Alarmsystem und -verfahren mittels einer Analyse des Signals eines Sensors - Google Patents

Alarmsystem und -verfahren mittels einer Analyse des Signals eines Sensors Download PDF

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Publication number
EP0654768A1
EP0654768A1 EP95100614A EP95100614A EP0654768A1 EP 0654768 A1 EP0654768 A1 EP 0654768A1 EP 95100614 A EP95100614 A EP 95100614A EP 95100614 A EP95100614 A EP 95100614A EP 0654768 A1 EP0654768 A1 EP 0654768A1
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EP
European Patent Office
Prior art keywords
value
microcontroller
amplifier
alarm system
gain
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Withdrawn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
EP95100614A
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English (en)
French (fr)
Inventor
Didier Pedemas
Jean-Claude Pajonk
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.)
Valeo Electronique SA
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Valeo Electronique SA
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Publication date
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Publication of EP0654768A1 publication Critical patent/EP0654768A1/de
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1609—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems
    • G08B13/1618—Actuation by interference with mechanical vibrations in air or other fluid using active vibration detection systems using ultrasonic detection means

Definitions

  • the present invention relates to a method for adjusting an alarm system by analyzing a reception signal from a sensor detecting a standing wave regime established in a passenger compartment of a vehicle, in particular by ultrasonic waves, so detecting by the modifications of said standing wave regime an intrusion into the passenger compartment.
  • the invention also relates to such an alarm system implementing the method.
  • AGC automatic gain correction
  • the automatic gain correction makes it possible to lower or decrease the overall gain, at least on the first stages, so as to lower the output signal from the processing chain below a certain level. threshold.
  • the AGC gives the maximum gain. If the overall gain of the chain is high, and the intrusion that occurs at this time is rapid and leads to an unfavorable displacement of the standing wave regime, the detection chain is saturated and it no longer allows the intrusion phenomenon to be detected.
  • the invention also relates to an alarm system comprising at least one transmitter producing a standing wave regime in the passenger compartment of a vehicle under alarm, and at least one receiver, characterized in that it comprises means for carrying out an adaptation of the characteristics of the processing chain according to a process as defined above.
  • FIG 1 there is shown a preferred embodiment of an alarm system implementing the method of the invention.
  • the alarm system comprises at least one module 1 emitting ultrasonic waves which includes a capsule emitting ultrasonic waves when an electrode thereof is activated by oscillations, for example at 40 kilohertz produced by an oscillator circuit 5 which it is connected to it by a wire connection 6.
  • the oscillator is connected to an output port 10 of a microcontroller M which supplies it with a control and / or power signal.
  • the alarm system also includes at least one receiver 2 consisting of a capsule 14 for receiving ultrasonic waves, the output 16 of which is connected to an input of an amplifier 15 with controllable gain.
  • the amplifier 15 includes at least one gain control input connected to at least one other output port 13 of the microcontroller M.
  • the receiver 2 also includes a demodulator circuit 18 connected to an output 17 of the gain amplifier 15 controllable.
  • the output 19 of the demodulator 18 is connected to a port 20 for analog-digital conversion of the microcontroller M.
  • the microcontroller M also comprises at least one input port 9 connected by a suitable link 8 to a sensor 7 for measuring the environment such as a temperature sensor or a relative humidity sensor, or an atmospheric pressure sensor, etc. .
  • the microcontroller M also comprises at least one input port 22 connected by a suitable link 24 to a control device 25 constituted for example by at least one push button operated by the user of the alarm system to start the system alarm.
  • this control device can be supplemented by command input means making it possible in particular to reconfigure the microcontroller M, or to load it with a new work program, or new data.
  • the microcontroller M also includes an output port 21 connected to a device 23 for displaying voice type messages (using a voice synthesizer), or sound (using a buzzer or other speaker ) or alphanumeric (using a console or a liquid crystal panel), or of viewing information in light and / or colored form (using light-emitting diodes, colored or not, the lighting and extinction indicates the state of the alarm system).
  • voice type messages using a voice synthesizer
  • sound using a buzzer or other speaker
  • alphanumeric using a console or a liquid crystal panel
  • of viewing information in light and / or colored form using light-emitting diodes, colored or not, the lighting and extinction indicates the state of the alarm system.
  • the microcontroller M comprises at least one output port 26 connected to a control input 27 of an alarm device which can be constituted in particular by an alarm siren and / or by a means producing a function invalidation signal of the protected vehicle as a signal to inhibit the injection or ignition computer, a signal to block the alternator, etc.
  • the microcontroller M has an electrical power input 11 connected to a device power supply, for example constituted by a voltage regulator connected to the vehicle battery, or any other electricity generating device and in particular on an uninterruptible power supply so as to resist breakdowns or sabotage of the power supply while the alarm system is on.
  • a device power supply for example constituted by a voltage regulator connected to the vehicle battery, or any other electricity generating device and in particular on an uninterruptible power supply so as to resist breakdowns or sabotage of the power supply while the alarm system is on.
  • FIG. 2 an embodiment of the receiver 2 of the system of FIG. 1 is shown.
  • the capsule for receiving the ultrasonic waves is here represented by the reference 30 and is connected between earth and a suitable input 31 of a first amplifier 32 with controllable gain whose gain control input 33 is connected by a suitable link 34 to an access terminal 46 of the module 49 integrating the microcontroller M.
  • This access terminal 46 delivers a control signal whose value represented in particular by the DC voltage level makes it possible to determine the gain which it is desired to fix on the first amplifier 32.
  • the amplified output 35 of the amplifier 32 is connected to an input of a demodulator 36 whose output 37 is connected to the input of a first filter 38, of low-pass type, the output 39 of which is transmitted from a part at an input of a second filter 40, of high-pass type, and by a link 42 to an access 52 of the aforementioned module 49 and which is connected to a first analog-digital conversion port CAN1 of the microcontroller M.
  • the output 41 of the high-pass filter 40 is connected to the input of a second amplifier 43 with controllable gain, the gain control input 44 of which is connected by a suitable link 45 to an access terminal 47 of the module 49.
  • the amplified output of the second amplifier 43 is connected by a suitable link to an access terminal 48 of the module 49, and is transmitted to a second analog-digital conversion port of the microcontroller M.
  • the part of the assembly arranged to the left of the access terminals 46, 47, 48, 52 of the module 49 is of the analog type and is constituted by a standard circuit suitable for any type of detection according to the invention, for any vehicle.
  • the part arranged to the right of the same terminals, and which has been designated under the term of module 49, is rather of digital nature and is specific to a type of vehicle, to a given type of application.
  • the personalization, or specialization, of each module is carried out in software so as to facilitate the standardization of the mass production of the alarm system according to the invention, which is a notable advantage of the present invention, in the measure where it allows a significant reduction in manufacturing costs. However, this reduction in costs is directly linked to the architecture of the assembly and to the particular nature of the process used, as will be seen.
  • the method of the invention consists in providing a succession of learning and scanning phases, a succession determined in advance, but certain phases of which can be postponed depending on the circumstances.
  • the alarm system When the alarm system according to the invention is started, one begins with an initial learning phase during which the system transmitter 1 sends a wave train of determined shapes.
  • the emission of a wave train is executed in such a way that the receiver 2 detects at the start and / or at the end of each pulse an ultrasonic wave in progressive mode, characteristic of the volume and of its conventional conditions.
  • the microcontroller which collects the data then executes a learning process by assuming that there is no intrusion in progress.
  • the microcontroller stores the minimum value and the maximum value of the received wave.
  • Figure 3 there is shown the case of such reception.
  • the train of transmitted waves OE having a particular envelope ENV-E obtained by a suitable control of the oscillator 5 thanks to the output port 10 of the microcontroller activated according to a particular program recorded in a memory area not shown of the microcontroller M, is received by receiver 2, the latter develops a response represented by the OR curve, representative of the received wave.
  • the signal received by the receiver 2 is transmitted to the analog-digital conversion port 19 of the microcontroller M, a particular program of which, recorded in a memory area not shown of the microcontroller M, makes it possible to store the minimum value Vmin and the maximum value Vmax.
  • ⁇ Vmax ⁇ (Sum (Vmax (i))) / Nt
  • the learning phase is completed when the pair of acquired values (Vmax, Vmin) is stable, that is to say that it no longer varies during the emission of new OE wave trains. .
  • this situation occurs after a few hundred milliseconds for 50 millisecond wave trains with ultrasound waves at 40 kilohertz. Therefore, according to another embodiment, there is a predetermined number of acquisitions corresponding to a sufficient time for the ultrasound system to be stabilized.
  • the microcontroller M deduces detection data, using pre-recorded tables or by calculation according to a pre-recorded law, from adaptation values of the processing chain.
  • these values adaptation are constituted by a gain control value applied to the first amplifier 32 by the microcontroller M by means of the link 34.
  • the gain value of the first amplifier makes it possible to bring the average value Vm of the reception signal SR (FIG. 3b) to a value such that: Vm ⁇ Vsat - G where Vsat is the saturation value of the processing chain and G is a predetermined guard value according to the characteristics of the reception chain.
  • the microcontroller M develops as adaptation values a gain value of the second amplifier 43, which is transmitted to it by a link 45 at its input 44, such as the maximum peak value of the output signal of the high pass filter 40 of the processing chain (in which the reception signal loses its DC component) is still less than the saturation value with a guard value g which corresponds in particular to the detection value of a possible intrusion.
  • a gain value of the second amplifier 43 which is transmitted to it by a link 45 at its input 44, such as the maximum peak value of the output signal of the high pass filter 40 of the processing chain (in which the reception signal loses its DC component) is still less than the saturation value with a guard value g which corresponds in particular to the detection value of a possible intrusion.
  • the microncontroller M ensures that: Vcm ⁇ Vsat - g.
  • the reception chain will be suitable for detection at the maximum sensitivity without having to fear saturation at the time of detection of a possible intrusion.
  • this learning phase is repeated at predetermined intervals, for example with a predetermined periodicity, repetition which is interrupted upon detection of an intrusion.
  • the modifications of the previous adjustments of the adaptation values are only accepted if they are confirmed after several learning phases, for example five phases separated by 500 milliseconds.
  • FIG. 4 a flow diagram of the functions is shown, which in the invention is implemented in the microcontroller M in the form of a program, so as to carry out a detection of the reception signal while largely eliminating the noise.
  • FIGS. 5 and 6 show spectral reception characteristics according to the invention.
  • the microcontroller M comprises an input routine or subroutine 60 of the data X (p), with p representing the order of the digital sample acquired on the analog conversion port 48 at the output of the second amplifier analog 43 (figure 2).
  • the flow of sequential data X (p) is supplied to a memory, the addressing of which makes a switch 61 to a plurality of high-pass and / or low-pass filterings performed by operators F1, F2, ..., FN in number N and which operate in parallel.
  • the selection means 70 also includes a first output 71 of the selected average, demodulated and filtered, transmitted to a means 76 for processing and recognizing the levels and durations, and a second output 72 which transmits the number of the channel Fi from filtering to choose as we will explain.
  • FIG. 5 shows spectral characteristics recognized in the present invention.
  • a high-pass digital filtering is used according to an FPH spectral characteristic which is adapted according to the circumstances.
  • ⁇ X (p) ⁇ ⁇ a (p - P0 + 1) .X (p- P0 + 1) + a (p - P0 + 2) .X (p-P0 + 2) + ... + a ( p) .X (p) ⁇ / P0
  • the fact of having a battery of filtering channels makes it possible, during the adaptation (or learning) step, to pre-select the filtering channel Fi0 matched which produces on a 69-i0 output a minimum voltage value.
  • This value i0 is transmitted by the means 70 to a selection member by a link 74 connected to its output 72 and which makes it possible to direct the following data acquired during the next step of scanning (or monitoring) towards the channel of filtering Fi0 suitable.
  • FIG. 6 another spectral characteristic has been shown in which the filters all have the same cutoff frequency fc, but slopes of order 1, order 2, respectively, etc.
  • the filtering having to be selected must be selected. the lowest slope (the lowest order) possible and / or at the minimum detection level in the absence of an intrusion.
  • the filters are successively calculated using a single subroutine, to which, during the previous adaptation phase, a command (equivalent to the aforementioned switching command 74) is transmitted which regulates the frequency of cutoff and / or filter order.
  • the inventors have measured that in general, the events which did not correspond to intrusion situations and which triggered the false alarms of the systems of the prior art, exhibit close spectral characteristics, but durations and different levels.
  • the processing means 76 performs a measurement of the levels received ⁇ X (p ⁇ * selected and compares them to predetermined thresholds. When it is observed that the duration of a received signal, of level higher than the predetermined threshold, exceeds a certain value, the output 77 of the processing means 76 is placed at an active level which activates an alarm device or any alarm action indicating that an intrusion has occurred.
  • FIG. 7 there is shown an embodiment of an algorithm which is used in the processing means 76.
  • a high-pass filtering is carried out at a cutoff frequency greater than a noise threshold frequency, equal in a preferred embodiment to 10 Hz.
  • the output X1 (n) is transmitted to a demodulation means, which performs, during a step S3, the calculation of the absolute value of the filtered signal.
  • X2 (n) is subjected during a step S4 to a smoothing.
  • this smoothing is performed by a low-pass filter having a cutoff frequency equal to 5 Hz and a slope of order 1.
  • This threshold value is used, at least in part, to define an intrusion threshold which makes it possible to trigger an alarm action.
  • This value Cmax is taken equal to 80 in one embodiment, which corresponds to a duration of 800 milliseconds for a detection signal level greater than the detection threshold. This makes it possible to correctly detect, without the risk of false alarms, an intrusion.
  • a second counter D is incremented, which therefore measures the duration during which the level of the detection signal is below the intrusion threshold S.
  • a test S8 is executed to find out whether the current value of the second counter D is greater than a threshold value N which moreover serves to determine the detection threshold S of step S5.
  • N 30 was chosen which corresponded to a duration of 300 milliseconds, less than the duration Cmax of 800 milliseconds on the first counter. It can therefore be seen that the two counters C and D make it possible to overcome situations of false alarms in which, in particular, except during periods of silence less than the second maximum duration of 300 milliseconds, repeated shocks for example, could be confused with intrusions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP95100614A 1992-05-26 1993-05-21 Alarmsystem und -verfahren mittels einer Analyse des Signals eines Sensors Withdrawn EP0654768A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9206417 1992-05-26
FR9206417A FR2691822B1 (fr) 1992-05-26 1992-05-26 Procede et systeme d'alarme par analyse d'un signal de reception d'un capteur.
EP93401315A EP0572302A1 (de) 1992-05-26 1993-05-21 Alarmsystem und -verfahren mittels einer Analyse des Signals eines Sensors

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EP93401315.2 Division 1993-05-21

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EP0654768A1 true EP0654768A1 (de) 1995-05-24

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EP93401315A Withdrawn EP0572302A1 (de) 1992-05-26 1993-05-21 Alarmsystem und -verfahren mittels einer Analyse des Signals eines Sensors
EP95100614A Withdrawn EP0654768A1 (de) 1992-05-26 1993-05-21 Alarmsystem und -verfahren mittels einer Analyse des Signals eines Sensors

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JP (1) JPH06168382A (de)
FR (1) FR2691822B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2319842A (en) * 1996-11-28 1998-06-03 Valeo Electronique Vehicle intruder alarm
FR2767948A1 (fr) * 1997-09-02 1999-03-05 Valeo Electronique Procede et dispositif pour la detection d'intrusion par emission et reception d'ondes ultrasonores dans un vehicule automobile
US7535351B2 (en) 2006-07-24 2009-05-19 Welles Reymond Acoustic intrusion detection system
CN105487079A (zh) * 2015-12-11 2016-04-13 成都翰兴科技有限公司 增益闪灯型地下停车场倒车辅助系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2727552B1 (fr) * 1993-12-28 1997-01-10 Valeo Electronique Procede de reglage d'un module d'alarme en particulier d'un module d'alarme a ultrasons, et un module d'alarme mettant en oeuvre un tel procede, notamment dans un vehicule automobile
JP3919515B2 (ja) 2001-11-29 2007-05-30 富士通テン株式会社 車載用侵入検知装置および方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050022A (en) * 1979-05-02 1980-12-31 Moser M Intruder Alarm
US4991146A (en) * 1989-11-30 1991-02-05 Deere & Company Intrusion detection system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3838150A1 (de) * 1988-11-10 1990-05-31 Reinshagen Kabelwerk Gmbh Vorrichtung zur ultraschallueberwachung von raeumen, insbesondere von kraftfahrzeug-innenraeumen
DE4033605C1 (de) * 1990-10-23 1991-12-19 Kabelwerke Reinshagen Gmbh, 5600 Wuppertal, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050022A (en) * 1979-05-02 1980-12-31 Moser M Intruder Alarm
US4991146A (en) * 1989-11-30 1991-02-05 Deere & Company Intrusion detection system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2319842A (en) * 1996-11-28 1998-06-03 Valeo Electronique Vehicle intruder alarm
GB2319842B (en) * 1996-11-28 2001-03-21 Valeo Electronique Method and device for detecting intrusion into a motor vehicle
FR2767948A1 (fr) * 1997-09-02 1999-03-05 Valeo Electronique Procede et dispositif pour la detection d'intrusion par emission et reception d'ondes ultrasonores dans un vehicule automobile
EP0901021A1 (de) * 1997-09-02 1999-03-10 Valeo Electronique Verfahren und Vorrichtung zur Erfassung des Eindringens in ein Fahrzeug durch Ultraschallwellenübertragung und -empfang
US6057760A (en) * 1997-09-02 2000-05-02 Valeo Electronique Method and device for detecting intruders by emitting and receiving ultrasound waves in an automobile vehicle
US7535351B2 (en) 2006-07-24 2009-05-19 Welles Reymond Acoustic intrusion detection system
CN105487079A (zh) * 2015-12-11 2016-04-13 成都翰兴科技有限公司 增益闪灯型地下停车场倒车辅助系统

Also Published As

Publication number Publication date
FR2691822A1 (fr) 1993-12-03
FR2691822B1 (fr) 1994-07-08
EP0572302A1 (de) 1993-12-01
JPH06168382A (ja) 1994-06-14

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