FR2476354A1 - Petrol anti-theft alarm - includes electronic circuit sensitive to movement of float controlled resistor normally driving petrol gauge - Google Patents

Petrol anti-theft alarm - includes electronic circuit sensitive to movement of float controlled resistor normally driving petrol gauge Download PDF

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Publication number
FR2476354A1
FR2476354A1 FR8003761A FR8003761A FR2476354A1 FR 2476354 A1 FR2476354 A1 FR 2476354A1 FR 8003761 A FR8003761 A FR 8003761A FR 8003761 A FR8003761 A FR 8003761A FR 2476354 A1 FR2476354 A1 FR 2476354A1
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France
Prior art keywords
petrol
alarm
gauge
resistor
capacitor
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Withdrawn
Application number
FR8003761A
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French (fr)
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Individual
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Individual
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Priority to FR8003761A priority Critical patent/FR2476354A1/en
Publication of FR2476354A1 publication Critical patent/FR2476354A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1004—Alarm systems characterised by the type of sensor, e.g. current sensing means
    • B60R25/101—Fuel level sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)

Abstract

The alarm uses the variable resistor which normally controls the operation of the fuel gauge. A connection is made via a diode to an adjustable biasing bridge and resistor to the base of an NPN transistor. The variable resistor controls the sensitivity of the device. The alarm circuit is such that variation in the level of petrol, and hence the gauge potentiometer position activates the alarm. A time delay circuit allows the petrol in the tank to settle after the vehicle has stopped, before activating the alarm. The resistances bias the base of the transistor for a period of time after switching of the vehicle's engine, the length of the period depending on the resistance and capacitor size.

Description

DISPOSITIF D'ALAF3E CONTRE LE VOL DU CURBULUNT DANS LES RBSvRVOIRS
DES VéHICULES AUmOlTOBILES. ALAF3E DEVICE AGAINST THEFT OF CURBULUNT IN RBSvRVOIRS
MOTOR VEHICLES.

La présente invention concerne un dispositif permettant de déceler instanément la variation annormale d'un niveau liquide, convenant tout particulierement comme appareil d'alarme contre le vol du carburant dans les réservoirs des véhicules automobiles. The present invention relates to a device for instantly detecting the abnormal variation of a liquid level, very particularly suitable as an alarm device against theft of fuel in the tanks of motor vehicles.

Toutefois, il est possible d'utiliser ce dispsositif pour d'autre applications similaires, à titre d'exemple: Réservoirs d'alcool,produits dangereux etc ... However, it is possible to use this device for other similar applications, for example: Alcohol tanks, dangerous products, etc.

Il existe déja à l'heure actuelle des appareils fonctionnant avec différentes sondes, mais ces procédés nécessitent des installations complexes et couteuses. At the present time there are devices operating with different probes, but these methods require complex and costly installations.

Selon l'invention, l'appareil se raccorde directement au curseur du potentiomètre solidaire de la jauge du réservoir et ne fausse pas l'indication de l'appareil de mesure placé sur le tableau de bord du véhicule. According to the invention, the device is connected directly to the cursor of the potentiometer secured to the tank gauge and does not distort the indication of the measuring device placed on the dashboard of the vehicle.

L'invention sera d'ailleurs mieux comprise grace à la déscription qui suit, donner en regard des dessins et planches annexées. The invention will moreover be better understood thanks to the following description, give opposite the attached drawings and plates.

Sur ces dessins
La figure 1 - Planche I représente la structure de l'ensemble du dispositif.On these drawings
Figure 1 - Plate I represents the structure of the entire device.

La figure 2 - Planche II représente le schéma éléctronique détaillé du dispositif d'alarme.  Figure 2 - Plate II represents the detailed electronic diagram of the alarm device.

Si on se reporte maintenant à la figure 1
A - Représente l'alimentation, c'est à dire la batterie.If we now refer to Figure 1
A - Represents the power supply, ie the battery.

B - Represente la temporisation permettant la stabilisation du liquide
avant mesure.B - Represents the time delay allowing the stabilization of the liquid
before measurement.

C - Représente le pont de mesure dont lwalimentation est stabilisée.C - Represents the measurement bridge whose power supply is stabilized.

D - Représente le déclencheur fonctionnant à la suite du désiquilibre
du pont de mesure (c)
E - Représente la temporisation de durée d'alarme.D - Represents the trigger operating following the imbalance
of the measuring bridge (c)
E - Represents the alarm duration time delay.

Le schéma complet du dispositif est représenté par la figure 2
L'alimentation de l'étage de mesure est séparée du reste de l'alimentation, au moyen d'une diode (i) permettant une stabilisation au moyen d'un condensateur (2).The complete diagram of the device is shown in Figure 2
The power supply of the measurement stage is separated from the rest of the power supply, by means of a diode (i) allowing stabilization by means of a capacitor (2).

L'ensemble de mesure est relié au curseur (c) du potentiomètre de la jauge par l'intermédiaire d'une diode (3) dont l'anode est reliée à un pont de polarisation de la base d'un transistor NPN (4) dont une des branche du pont est formée d'une résistance variable (5) permettant le réglage de la sensibilité de variation de niveau et une résistance de de scurité (6) l'autre coté du pont posséde un condensateur évitant les actions parasites - La base du transistor N?N (4) est attaquée par une résistance (7) et le collecteur du transistor NPN (4) est chargé par une résistance (8) reliée au (+) quant à l'émetteur du NPN (4) il est relié au (-) par une résistance de stabilisation (9). The measuring assembly is connected to the cursor (c) of the potentiometer of the gauge by means of a diode (3) whose anode is connected to a bias bridge of the base of an NPN transistor (4) one of the branch of the bridge is formed by a variable resistor (5) allowing the adjustment of the level variation sensitivity and a safety resistor (6) the other side of the bridge has a capacitor avoiding parasitic actions - The base of transistor N? N (4) is attacked by a resistor (7) and the collector of transistor NPN (4) is charged by a resistor (8) connected to (+) as for the emitter of NPN (4) it is connected to (-) by a stabilization resistor (9).

Le collecteur du transistor NPN (4) attaque la base du transistor PNP (10) par l'intermédiaire d'un condensateur (11) ce nouvel étage forme le système declencheur fonctionnant d'après les variations du pont de mesure précédemment exposé - L'émétteur du transistor PNP (10) est relié au (+) et le collecteur est chargé par une résistance (12). The collector of the NPN transistor (4) drives the base of the PNP transistor (10) via a capacitor (11) this new stage forms the trigger system operating according to the variations of the previously exposed measuring bridge - L ' PNP transistor emitter (10) is connected to (+) and the collector is charged by a resistor (12).

Le collecteur du transistor PNP (10) transmet l'impulsion positive à la gachette du thyristor (17) par l'intermédiaire d'un condensateur (13) dont la décharge est assurée par la résistance (14) - La diode (15) joue le rôle d'anti-retour - La gachette du thyristor (17) est reliée à sa cathode par l'intermédiaire d'une diode (18) afin d'éviter des déclenchements parasites. The PNP transistor collector (10) transmits the positive pulse to the thyristor trigger (17) via a capacitor (13) whose discharge is ensured by the resistor (14) - The diode (15) plays the role of non-return - The thyristor trigger (17) is connected to its cathode by means of a diode (18) in order to avoid parasitic tripping.

La temporisation de l'alarme est donne par un système de résistances et condensateurs comprenant le réseau suivant : Un condensateur (19) est chargé par le contact repos du relais (29) et par l'intermé dia ire d'une résistance (22) c'est donc cette dernière qui determine le temps de stabilisation du liquide dans le réservoir - La base du transistor (20) est polarisée par le (+) du condensateur (19) par l'tintez médiaire de la résistance (21) c'est cette dernière qui détermine la durée de l'alarme. The alarm delay is given by a system of resistors and capacitors comprising the following network: A capacitor (19) is charged by the rest contact of the relay (29) and by the intermediary of a resistor (22) it is therefore the latter which determines the stabilization time of the liquid in the reservoir - The base of the transistor (20) is polarized by the (+) of the capacitor (19) by the intermediate tint of the resistor (21) c ' it is the latter which determines the duration of the alarm.

Dés qu'une impulsion apparait sur la gachette du thyristor (17) ce dernier ce bloque, car il est traversé par un courant continu apparaissant entre la cathode et le collecteur du transistor NPN (20) et la résistance de charge (23) à partir de cet état de conduction, le condensateur (25) chargé par l'intermédiaire de la résistance (24) et des que la tension aux bornes du condensateur atteint 6,2 volts, la diode ZENER (26) polarise la base du transistor NPN (30) dont le collecteur est relié à la bobine du relais (29) dont le contact travail alimente l'avertisseur sonore. As soon as a pulse appears on the trigger of the thyristor (17) the latter blocks this, because it is crossed by a direct current appearing between the cathode and the collector of the NPN transistor (20) and the load resistance (23) from from this conduction state, the capacitor (25) charged via the resistor (24) and as soon as the voltage across the capacitor reaches 6.2 volts, the ZENER diode (26) polarizes the base of the NPN transistor ( 30) whose collector is connected to the relay coil (29) whose working contact supplies the horn.

Principe de fonctionnement de l'ensemble : Le pont de mesure page 1 ≈35 à 40 et page 2 ≈1 à 5 controle en permanence le niveau électrique - La tension au collecteur.du transistor NPN (4) reste équilibrée tant que le niveau reste stable.Par contre, dés qu'un desequi- libre apparait dans le pont par suite de la variation du potentiomètre de la jauge, la polarisation du transistor NPN (4) est modifiée et l'impulsion apparait à la suite du condensateur (11) et sur la base du transistor PNP (1O) et de façon concomitante sur la gachette du thyristor (12) par l'intermédiaire du réseau formé par le condensateur (13) shunté par la résistance (14) et la liaison anti-retour obtenue par la diode (15) - Le thyristor (17) etant bloqué, il y a donc déclenchement de l'alarme par l'intermédiaire du transistor (30) dont le collecteur alimente la bobine du relais (29). Principle of operation of the assembly: The measurement bridge page 1 ≈35 to 40 and page 2 ≈1 to 5 permanently monitors the electrical level - The voltage at the collector. Of the NPN transistor (4) remains balanced as long as the level remains On the other hand, as soon as an imbalance appears in the bridge as a result of the variation of the potentiometer of the gauge, the polarization of the NPN transistor (4) is modified and the pulse appears following the capacitor (11) and on the base of the PNP transistor (1O) and concomitantly on the trigger of the thyristor (12) via the network formed by the capacitor (13) shunted by the resistor (14) and the non-return link obtained by the diode (15) - The thyristor (17) being blocked, there is therefore triggering of the alarm via the transistor (30) whose collector supplies the coil of the relay (29).

InDBrlat de l'invention et de son application. InDBrlat of the invention and its application.

La présente invention concerne l'association d'éléments électroniques permettant de controler en permanence l'état du niveau d'un liquide dans un réservoir. The present invention relates to the combination of electronic elements making it possible to permanently control the state of the level of a liquid in a reservoir.

L'invention représente un intêret remarquable dans l'application de l'alarme en cas de vol de carburant par exemple. The invention represents a remarkable interest in the application of the alarm in the event of fuel theft for example.

Bien entendu, l'invention n'est pas limite aux détails ci-dessus car le système n'est donné qu'a titre d'exemple. Of course, the invention is not limited to the details above because the system is given only by way of example.

De nombreuses variantes et modifications pourront être apportées au mode de réalisation décrit et présenté sans toutefois sortir du cadre de l'invention.  Many variants and modifications can be made to the embodiment described and presented without however departing from the scope of the invention.

Claims (5)

RL:VTDIC AT IONSRL: VTDIC AT IONS 10) Dispositif d'alarme contre le vol de carburant dans les réservoirs des véhicules automobiles, caractérisé par le fait qu'il s'adapte directement sur le potentiomètre de la jauge du réservoir, sans modification de ce dernier. 10) Alarm device against theft of fuel in the tanks of motor vehicles, characterized in that it adapts directly to the potentiometer of the tank gauge, without modification of the latter. 20) Dispositif selon revendication 1, caractérisé par la présence d'un pont réglable aux essais au moyen d'une résistance variable (5) évitant le fonctionnement par suite d'évaporation ou léger mouvement du véhicule. 20) Device according to claim 1, characterized by the presence of an adjustable bridge to the tests by means of a variable resistance (5) avoiding operation due to evaporation or slight movement of the vehicle. 30) Dispositif selon l'une des revendications ci-dessus, caractérisé en ce qu'il comporte une temporisation constituéepar l'ensemble des résistances (21) (22) et le condensateur (19) permettant la stabilisation du car- burant après arrêt du véhicule et mise en service de l'alarme. 30) Device according to one of the above claims, characterized in that it comprises a time delay constituted by all of the resistors (21) (22) and the capacitor (19) allowing the stabilization of the fuel after stopping the vehicle and activation of the alarm. 40) Dispositif selon l'une des revendications ci-dessus, caraotérisé par le fait que la temporisation de stabilisation permet de limiter la durée de l'alarme par l'intermédiaire du condensateur (19) et la résistance (21) polarisant la base du transistor (20). 40) Device according to one of the above claims, characterized by the fact that the stabilization delay limits the duration of the alarm by means of the capacitor (19) and the resistor (21) polarizing the base of the transistor (20). 50) Dispositif selon l'une des revendications ci-dessus et caracterisé par le fait que la combinaison des composants électroniques permet le déclenchement de l'alarme a chaque renouvellement de prélevement de carburant.  50) Device according to one of the above claims and characterized in that the combination of electronic components allows the triggering of the alarm at each renewal of fuel withdrawal.
FR8003761A 1980-02-18 1980-02-18 Petrol anti-theft alarm - includes electronic circuit sensitive to movement of float controlled resistor normally driving petrol gauge Withdrawn FR2476354A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8003761A FR2476354A1 (en) 1980-02-18 1980-02-18 Petrol anti-theft alarm - includes electronic circuit sensitive to movement of float controlled resistor normally driving petrol gauge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8003761A FR2476354A1 (en) 1980-02-18 1980-02-18 Petrol anti-theft alarm - includes electronic circuit sensitive to movement of float controlled resistor normally driving petrol gauge

Publications (1)

Publication Number Publication Date
FR2476354A1 true FR2476354A1 (en) 1981-08-21

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1762418A1 (en) * 2005-09-09 2007-03-14 Christian Götzger Fuel theft alarming system
GB2469336A (en) * 2009-04-09 2010-10-13 Richard Scott A fuel theft alarm for a vehicle fuel tank
EP2615001A3 (en) * 2012-01-12 2013-07-31 Scania CV AB Device and method for detecting the abnormal removal of fuel from a fuel tank
CN113910892A (en) * 2021-09-30 2022-01-11 东风商用车有限公司 Oil tank burglar alarm and commercial car

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1762418A1 (en) * 2005-09-09 2007-03-14 Christian Götzger Fuel theft alarming system
GB2469336A (en) * 2009-04-09 2010-10-13 Richard Scott A fuel theft alarm for a vehicle fuel tank
EP2615001A3 (en) * 2012-01-12 2013-07-31 Scania CV AB Device and method for detecting the abnormal removal of fuel from a fuel tank
CN113910892A (en) * 2021-09-30 2022-01-11 东风商用车有限公司 Oil tank burglar alarm and commercial car

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