FR2804921A1 - Ignition disabling system of a car uses an antenna coupled to a base station and a micro-controller communicating via two wires - Google Patents
Ignition disabling system of a car uses an antenna coupled to a base station and a micro-controller communicating via two wires Download PDFInfo
- Publication number
- FR2804921A1 FR2804921A1 FR0001732A FR0001732A FR2804921A1 FR 2804921 A1 FR2804921 A1 FR 2804921A1 FR 0001732 A FR0001732 A FR 0001732A FR 0001732 A FR0001732 A FR 0001732A FR 2804921 A1 FR2804921 A1 FR 2804921A1
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- France
- Prior art keywords
- microcontroller
- signal
- base
- electronics
- station
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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
- B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
- B60R25/04—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on the propulsion system, e.g. engine or drive motor
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
- G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lock And Its Accessories (AREA)
- Selective Calling Equipment (AREA)
Abstract
Description
<U>PERFECTIONNEMENTS AUX</U> SYSTEMES <U>D'IMMOBILISATION DE</U> VEHICULE, <U>NOTAMMENT AUTOMOBILE</U> La présente invention est relative aux systèmes d'immobilisation de véhicule, notamment automobile. <U> IMPROVEMENTS IN </ U> VEHICLE <U> IMMOBILISATION SYSTEMS, <U> IN PARTICULAR AUTOMOBILE </ U> The present invention relates to vehicle immobilization systems, in particular automobile.
Classiquement, ainsi qu'illustré sur la figure 1, un système d'immobilisation de véhicule comporte un micro-contrôleur 1, qui gère la fonction d'immobilisation, ainsi qu'une antenne 2 destinée à recevoir d'un transpondeur 3 un code d'identification destiné à désactiver le système d'immobilisation. Conventionally, as illustrated in FIG. 1, a vehicle immobilization system comprises a microcontroller 1, which manages the immobilization function, as well as an antenna 2 intended to receive from a transponder 3 a code of immobilization of a vehicle. identification to disable the immobilizer system.
Généralement, cette antenne est un bobinage qui entoure le barillet B destiné à recevoir la clé de contact du véhicule. Elle est reliée au micro- contrôleur 1 par l'intermédiaire d'une électronique 4, appelée base- station par l'homme du métier, qui est portée par un circuit imprimé disposé au voisinage immédiat du barillet, dans un logement ménagé dans un surmoulage en matériau plastique qui entoure celui-ci. Generally, this antenna is a winding which surrounds the barrel B intended to receive the ignition key of the vehicle. It is connected to the microcontroller 1 via an electronics 4, called base station by the skilled person, which is carried by a printed circuit disposed in the immediate vicinity of the cylinder, in a housing formed in an overmoulding plastic material that surrounds it.
Habituellement, cette électronique base-station 4 est du type de celles commercialisées par la société Texas Instruments ou TIRIS sous la terminologie TMS 3705 ou TMS 3705A. Usually, this base-station electronics 4 is of the type marketed by Texas Instruments or TIRIS under the terminology TMS 3705 or TMS 3705A.
Les électroniques de ce type communiquent avec le micro- contrôleur 1 par l'intermédiaire de deux fils, l'un par lequel le micro- contrôleur 1 interroge le transpondeur 3 (signal dit TXCT), l'autre par lequel le transpondeur 3 et la base-station 4 répondent au micro-contrôleur 1 en leur transmettant des données (signal dit SCIO). The electronics of this type communicate with the microcontroller 1 via two wires, one by which the microcontroller 1 interrogates the transponder 3 (signal called TXCT), the other by which the transponder 3 and the base-station 4 respond to the microcontroller 1 by transmitting data (signal said SCIO).
Les électroniques de type TMS 3705 et 3705A sont très intéressantes en termes de coût et d'encombrement. The TMS type electronics 3705 and 3705A are very interesting in terms of cost and bulk.
Toutefois, certains modèles de micro-contrôleurs utilisés dans les circuits d'immobilisation présentent un interface à trois fils. However, some models of microcontrollers used in immobilization circuits have a three-wire interface.
Ces micro-contrôleurs sont habituellement utilisés avec des électroniques base-station de type TMS 7781, également fabriqués par Texas Instruments. These microcontrollers are usually used with TMS 7781 base-station electronics, also manufactured by Texas Instruments.
L'un des fils transmet le signal par lequel le micro-contrôleur interroge le transpondeur (signal dit TXCT) ; un autre fil transmet le signal en retour en provenance du transpondeur (signal dit CODE) ; le troisième fil transmet un signal d'horloge (signal dit RXCK) qui permet au micro- contrôleur de décoder l'information portée par le signal CODE. Un but de l'invention est de proposer une structure permettant d'utiliser de tels micro-contrôleurs avec des électroniques base-station à deux fils, ce qui s'avère souhaitable, notamment pour des raisons de coût. A cet effet, l'invention propose un système d'immobilisation de véhicule, notamment automobile, comportant une antenne apte à recevoir un signal radiofréquence de désactivation émis par une unité de commande à distance, telle qu'un transpondeur, une électronique base station reliée à ladite antenne, et un microcontrôleur du type à interface à trois fils apte à communiquer de façon bidirectionnelle avec ladite électronique, caractérisé en ce que l'électronique base-station est du type à interface à deux fils, ladite électronique base-station recevant par un fil un premier signal porteur d'une information transmise par le micro-contrôleur et transmettant par un autre fil un second signal porteur d'une information à destination du microcontrôleur, et en ce qu'il est prévu un module électronique intermédiaire traitant ledit second signal pour générer un signal d'horloge transmis au microcontrôleur sur un fil et permettant audit microcontrôleur de décoder l'information en provenance de l'électronique base-station portée par un signal qui lui est transmis sur un autre fil. One of the son transmits the signal by which the microcontroller interrogates the transponder (signal said TXCT); another wire transmits the signal back from the transponder (signal called CODE); the third wire transmits a clock signal (so-called RXCK signal) which allows the microcontroller to decode the information carried by the CODE signal. An object of the invention is to provide a structure for using such micro-controllers with two-wire base-station electronics, which proves desirable, especially for cost reasons. For this purpose, the invention proposes a vehicle immobilization system, in particular an automobile system, comprising an antenna capable of receiving a radiofrequency deactivation signal emitted by a remote control unit, such as a transponder, an electronic base station connected. to said antenna, and a three-wire interface type microcontroller adapted to bidirectionally communicate with said electronics, characterized in that the base-station electronics is of the two-wire interface type, said base-station electronics receiving by a wire a first signal carrying information transmitted by the microcontroller and transmitting by another wire a second signal carrying an information to the microcontroller, and in that there is provided an intermediate electronic module processing said second signal for generating a clock signal transmitted to the microcontroller over a wire and allowing said microm ocontroller to decode the information from the base-station electronics carried by a signal that is transmitted to it on another wire.
D'autres caractéristiques et avantages de l'invention ressortiront encore de la description suit, laquelle est purement illustrative et non limitative et qui doit être lue en regard des dessins annexés sur lesquels - la figure 1, déjà discutée, illustre une structure de système d'immobilisation conforme à un état de la technique connu ; - les figures 2 à 4 illustrent plusieurs modes de réalisation possibles pour l'invention. Other features and advantages of the invention will become apparent from the description which follows, which is purely illustrative and nonlimiting, and which should be read with reference to the accompanying drawings, in which - FIG. 1, already discussed, illustrates a structure of a control system. immobilization according to a known state of the art; - Figures 2 to 4 illustrate several possible embodiments for the invention.
Sur le mode de réalisation de la figure 2, un module électronique intermédiaire 5 est interposé entre l'électronique base-station 4 et le micro-contrôleur 1. In the embodiment of FIG. 2, an intermediate electronic module 5 is interposed between the base-station electronics 4 and the microcontroller 1.
Le module 5 est relié à l'électronique 4 par deux fils, l'un qui transporte le signal TXCT, l'autre qui transporte le signal SCIO. II est en outre relié au micro-contrôleur 1 par trois fils. L'un de ces fils est celui qui transporte le signal TXCT transmis par le micro-contrôleur 1, à destination de l'électronique base-station 4 ; les deux autres transportent le signal CODE pour l'un et le signal RXCK pour l'autre. The module 5 is connected to the electronics 4 by two wires, one carrying the signal TXCT, the other carrying the signal SCIO. It is further connected to microcontroller 1 by three wires. One of these son is the one that carries the TXCT signal transmitted by the microcontroller 1, to the base-station electronics 4; the other two carry the CODE signal for one and the RXCK signal for the other.
A cet effet, le module 5 comporte des moyens, l'un permettant de déduire le signal CODE et le signal d'horloge RXCK du signal SCIO. For this purpose, the module 5 comprises means, one for deducing the CODE signal and the RXCK clock signal of the SCIO signal.
En variante, ainsi que l'illustre la figure 3, le micro-contrôleur 1 peut être directement relié à l'électronique base-station 4 par un fil transmettant le signal TXCT, le module intermédiaire 5 étant relié à l'électronique base-station 4 par un fil de transfert du signal SCIO, et au micro-contrôleur 1 par deux fils pour le transfert des signaux CODE et RXCK. Deux types de fonctionnements peuvent être envisagés - un mode lent asynchrone, - un mode rapide, synchrone dans lequel le module intermédiaire interroge le micro-contrôleur par le fil qui porte le signal SCIO pour que celui-ci réponde de façon plus rapide afin d'améliorer le temps de transition de l'information. Alternatively, as illustrated in FIG. 3, the microcontroller 1 can be directly connected to the base-station electronics 4 by a wire transmitting the TXCT signal, the intermediate module 5 being connected to the base-station electronics. 4 by a signal transfer wire SCIO, and the microcontroller 1 by two wires for the transfer of signals CODE and RXCK. Two types of operations can be envisaged - an asynchronous slow mode, - a fast, synchronous mode in which the intermediate module interrogates the microcontroller by the wire which carries the SCIO signal so that it responds more rapidly in order to improve the information transition time.
En variante encore (figure 4), le micro-contrôleur 1 et l'unité base- station 4 peuvent être reliés par deux fils, permettant l'un le transfert du signal TXCT, l'autre le transfert du signal CODEISCIO. As a further variant (FIG. 4), the microcontroller 1 and the base-station unit 4 can be connected by two wires, allowing one to transfer the TXCT signal, the other to transfer the CODEISCIO signal.
Le module intermédiaire 5 reçoit en dérivation le signal CODEISCIO et génère à partir de celui-ci le signal d'horloge RXCK transmis sur la troisième voie du microcontrôleur 1. The intermediate module 5 receives the CODEISCIO signal in derivation and generates therefrom the clock signal RXCK transmitted on the third channel of the microcontroller 1.
Dans tous les cas, le module intermédiaire 5 peut être réalisé sous la forme d'un circuit ASIC, d'un réseau logique programmable tel qu'un FPGA, d'un microcontrôleur, d'un module de logique combinatoire, etc. In any case, the intermediate module 5 can be implemented in the form of an ASIC circuit, a programmable logic array such as an FPGA, a microcontroller, a combinatorial logic module, etc.
Dans le cas d'un véhicule équipé d'un système d'accès mains libres, c'est à dire d'un système permettant à un utilisateur équipé d'un transpondeur adéquat, d'avoir accès à son véhicule (déverrouillage des portières) et de faire démarrer son véhicule sans clé mécanique, le module intermédiaire est avantageusement intégré dans une électronique gérant, au moins ou partie, les fonctions d'accès et/ou de démarrage mains libres. L'électronique base station 4 est par exemple une électronique TMS 3705 ou TMS 3705A (référence Texas Instrument) ou une électronique de structures et fonctions similaires. In the case of a vehicle equipped with a hands-free access system, that is to say a system allowing a user equipped with a suitable transponder, to have access to his vehicle (unlocking the doors) and to start its vehicle without a mechanical key, the intermediate module is advantageously integrated in an electronic manager, at least or part of the functions of access and / or hands-free start. Station 4 electronics is for example an electronic TMS 3705 or TMS 3705A (Texas Instrument reference) or an electronic structure and similar functions.
Le module intermédiaire 5 est avantageusement un module de logique combinatoire ou séquentielle.The intermediate module 5 is advantageously a combinatorial or sequential logic module.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0001732A FR2804921B1 (en) | 2000-02-10 | 2000-02-10 | IMPROVEMENTS IN VEHICLE IMMOBILIZATION SYSTEMS, ESPECIALLY AUTOMOTIVE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0001732A FR2804921B1 (en) | 2000-02-10 | 2000-02-10 | IMPROVEMENTS IN VEHICLE IMMOBILIZATION SYSTEMS, ESPECIALLY AUTOMOTIVE |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2804921A1 true FR2804921A1 (en) | 2001-08-17 |
FR2804921B1 FR2804921B1 (en) | 2002-04-26 |
Family
ID=8846918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR0001732A Expired - Fee Related FR2804921B1 (en) | 2000-02-10 | 2000-02-10 | IMPROVEMENTS IN VEHICLE IMMOBILIZATION SYSTEMS, ESPECIALLY AUTOMOTIVE |
Country Status (1)
Country | Link |
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FR (1) | FR2804921B1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0680859A2 (en) * | 1994-04-29 | 1995-11-08 | DeTeMobil Deutsche Telekom MobilNet GmbH | System for protecting a vehicle against unauthorized use |
DE4444798C1 (en) * | 1994-12-15 | 1996-04-11 | Siemens Ag | Vehicular antitheft device operated by portable code transmitter |
EP0753437A1 (en) * | 1994-06-06 | 1997-01-15 | SOCIETE D'APPLICATIONS GENERALES D'ELECTRICITE ET DE MECANIQUE SAGEM Société anonyme française | Anti theft system |
US5912512A (en) * | 1996-09-11 | 1999-06-15 | Toyota Jidosha Kabushiki Kaisha | Engine start control apparatus |
DE19802526A1 (en) * | 1998-01-26 | 1999-07-29 | Bosch Gmbh Robert | Device for control of access activation for road vehicles |
-
2000
- 2000-02-10 FR FR0001732A patent/FR2804921B1/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0680859A2 (en) * | 1994-04-29 | 1995-11-08 | DeTeMobil Deutsche Telekom MobilNet GmbH | System for protecting a vehicle against unauthorized use |
EP0753437A1 (en) * | 1994-06-06 | 1997-01-15 | SOCIETE D'APPLICATIONS GENERALES D'ELECTRICITE ET DE MECANIQUE SAGEM Société anonyme française | Anti theft system |
DE4444798C1 (en) * | 1994-12-15 | 1996-04-11 | Siemens Ag | Vehicular antitheft device operated by portable code transmitter |
US5912512A (en) * | 1996-09-11 | 1999-06-15 | Toyota Jidosha Kabushiki Kaisha | Engine start control apparatus |
DE19802526A1 (en) * | 1998-01-26 | 1999-07-29 | Bosch Gmbh Robert | Device for control of access activation for road vehicles |
Also Published As
Publication number | Publication date |
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FR2804921B1 (en) | 2002-04-26 |
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Effective date: 20101029 |