Vehicle with immobilizer device

0001The invention relates to a motor vehicle with an electronically controlled Automatic transmission with a transmission disposed inside the gearbox control unit and with an anti-theft system with immobilizer, comprise an outsize Entsperrsystem with a system controller, the vehicle side with a control device, within the framework of the immobilizer function of the system control unit is blocked, communicated.

0002For motor vehicles, a newer type an anti-theft system is with an immobilizer as standard generally provided. The Anti-theft system includes an outsize Entsperrsystem with a System controller. is via the system controller firstly detects whether the inserted into the ignition key "entitled" is to initiate the operation of the vehicle. Such key have usually a Transponter which a zündschlossnah arranged suitable reading device is read. In the system control unit is deposited a corresponding comparison code, the on correct ignition key can be recognized. If the ignition key verified, communicating the system controller in known theft systems with an engine control unit, the first relative to be the system controller a Contro also identified erätespezifische coding, including deposited a corresponding comparison code in the system control unit is. After appropriate identification of engine control unit asks this when the system control apparatus according because of a start permission, the control unit by the system is then added, when the verified proper ignition key has been. Then, the motor can be started and added the operating will.

0003Although known antitheft devices a high safety standard provide against unauthorized vehicle operation, is however the ability to bypass the anti-theft system and to operate the vehicle, even though the operator is not in possession of the 0-riginalschlüssels is. To this end, for example, the possibility of the original replace engine control unit against a modified engine control unit, no longer communicating with the system controller, or for the start permission is no corresponding signal from the system control unit required, in which it is sufficient, rather, only when from the main switch, a signal is given that a key inserted and the start command was given. It is also conceivable, for bypassing the anti-theft system on the original engine control unit on-top board to set and corresponding to contact that does not also respond to any incoming information from System Controller and allows engine operation despite actually existing immobilizer. Again, it is therefore possible, using any ignition key to operate the motor vehicle. After the motor control unit is very good and easy to access, is a relatively simple manipulation possible.

0004The invention is thus based on the problem to provide a motor vehicle, which has a higher standard of security against unauthorized use offers.

0005To solve this problem, in a motor vehicle of the initially mentioned Type according to the invention provided that the system control unit with communicates the arranged inside the transmission gearbox control unit and this locks or unlocks depending on demand.

0006When the motor vehicle according to the invention is the Wegfahrsperrenfunktionalität in a transmission control device that is disposed in the interior of the transmission, implemented. This transmission control unit is outside of very difficult available, this would be necessary to drain the transmission fluid, then to open the gearbox and expand the transmission control unit, to then carry out the manipulation. This is a considerable Installation and expenditure of time, the unauthorized Commissioning generally prevented. The function of the invention Motor vehicle intended theft warning system now looks at first the verification of the "legitimate" ignition key via the system control unit before, after the identification of the gearbox control unit and then its activation takes place when the proper key supplied has been. For the case that a wrong key is supplied, is the transmission control device is locked, that is, the system controller is no enable signal, the operation of the transmission control device and make this the connected via the transmission control unit functions would. With the motor vehicle according to the invention, therefore, the Safety standard can be significantly increased. Because it is nearly impossible, in the typically short time available to undertake the manipulation make the elaborate work on the gear.

0007provides a particularly advantageous development of the invention prior to that the system control device with at least one further vehicle side and gear external control unit communicates that on the is system control unit lockable or unlockable, which is located in this further control device appropriately to the engine control unit, which already is part of a known anti-theft systems, is. At this Invention embodiment is the safety standard even further increased because involved in the Wegfahrsperrenfunktionalität two separate control units are, which would have to manipulate, to operate the motor vehicle without authority. If only one control unit manipulated in any case remains the second suspended because this does not receive a release signal from the system controller. For example, as in the past sometimes the case, the engine control unit, for example, manipulated and tried to use the on-top board to operate the motor vehicle with any key, so successful Although it to start the engine after the result of the manipulation Engine control unit, the fact that the system controller which "non-permission" the ignition key has recognized, no role for engine start plays. If one tries but to select a gear, so ask the Transmission Control Module the system control unit, which still communicates with it, because of to be permitted to start. After the system control unit Although the original engine control unit has identified, however, the "unauthorized" Ignition key has been recognized, the system control unit no Start permission to the transmission control unit, which remains locked as before. It is then, for example, no gear is engaged, or remain the wheels blocks etc.

0008To further increase the safety standard can be provided, that the system control unit is arranged with at least one other gear in the Control unit communicates with each control unit via the System controller separately lockable or unlockable is. According to this invention embodiment So a third separate control unit in the anti-theft system integrated, whereby the safety standard maximized is, as a manipulation of three ECUs nearly impossible is feasible in a hurry to eat out.

0009As described, it is possible to implement the immobilizer for locking the or arranged in the Transmission Control Module to prevent a gear is engaged, what for example by can be prevented that the power circuit is interrupted in the transmission becomes. There is also the possibility of the adhesion to the drive wheels interrupting or blocking the drive wheels directly. In any case, on the transmission control device or the locked Operation of the transmission locked so that the vehicle can not be moved can.

0010It is especially advantageous if the or arranged in gear The control unit is arranged on or in a valve assembly of the transmission. The executed as a hybrid device in this case, the control unit is in itself a mechatronic component which electrically via the transmission control unit includes controlled valve assembly. About this valve assembly is the Fluid flow to the downstream transmission of a continuously variable transmission controlled. Here over the power circuit in the transmission is realized, the then, when the control device is locked, is interrupted. As part of a Manipulation takes the complete valve assembly, which is to be a relatively large mechatronic component is to be expanded, which as described is very complicated, and in addition to raising the vehicle, also the discharge of the engine oil requires.

0011Further advantages, features and details of the invention will be made the embodiment described below and from the Drawings. They show:<dl tsize="6"><dt>Fig. 1</dt><dd>a schematic diagram of a motor vehicle according to the invention a first embodiment, and</dd><dt>FIG. 2</dt><dd>a schematic view of another embodiment of a Anti-theft system.</dd></dl>

0012Fig. 1 shows an inventive motor vehicle 1 to a drive assembly 2 consisting of a motor 3 and a gearbox 4. The engine 3 associated with its undertaking controlling the engine control unit. 5 Internally of the transmission 4 is disposed a transmission control unit 6, to a mechatronic Valve assembly 7 of the continuously variable automatic transmission as preferably formed transmission 4 is arranged. The control units 5, 6 are involved in a theft protection system 8, the system control device 9 includes, arranged for example in the dashboard and typically other tasks takes over. The system controller 9 as described communicates with the two control devices 5 and 6 and the ignition lock 10, in which an ignition key to start the vehicle is to put 11th

0013If the motor vehicle 1 is put into operation, as described First, the ignition key 11 inserted into the ignition 10th At ignition key 11 is a Transponter 12 which emits a magnetic field, which is detected by a suitable detection means 13 on ignition and the corresponding information in the form of an identification signal to the system control unit is given. 9 This now checks the given Identification signal with a permanently stored in it compared identification, to detect in dependence on the comparison whether it with him the key 11 to the original, legitimate key concerns or a different, non-approved ignition key. If it is when the ignition key 11 to the original key, made in second step (but it can also temporally previously or run in parallel) the identification of the engine control unit 5, the identification signal an, optionally on request from the system control unit 9, to the system control unit 9 sends. The system controller 9 compares the identification signal with another permanently saved comparative identification. If the original detected the engine control unit 5, so the request is to be permitted to start characterized answered that - after the permissible ignition recognized was - the start signal is given and the control unit 5 of the motor 3 can be started.

0014Preferably parallel in time to communicate the system controller 9 the transmission control unit 6. Also, this is first identified by that an identification signal from the transmission control unit 6 to the system controller given 9, with the identification signal of there permanently stored comparison ID compares. If both agreement, is also here - after the original key has been detected - At the request of the transmission control unit 6 to a start permission signal the same given. Thus also the transmission control unit 6 is activated, the driver can now via the usual selector lever one gear or Select speed level, the one or more then, controlled by the transmission control unit 6, can be inserted positively on the valve assembly. 7

0015In the event, however, that the engine control unit 5 in any form whatsoever was manipulated in order to take the vehicle even in operation can, if it is the key 11 to an illegal, counterfeit Ignition key is, can the motor vehicle according to the invention however the startup can be prevented. Although it is due the manipulation of the control device 5 (eg by replacing the entire Controller or by attachment of an additional board or the like) to bridge possible to communicate with the system controller 9 to the extent that as that the engine control unit 5 not permitted to release from System control unit 9 required, but that it is sufficient, if the improper ignition key in the ignition switch 11, a rise signal (via the Control unit 9 or optionally, a separate line) is added. Of the Motor can be started in this case. but nevertheless, the Vehicle will not be operated because the gearbox control unit 6 continues to is locked. Because this gets permission to start or activation only if the original key is detected 11th After this this is not the case here, is the system controller 9 to the start permission request the Transmission Control Module 6 no enable signal, the transmission control unit thus 6 continues to be locked, the power circuit that the over Valve assembly would be 7 implemented, prevented and that remains Vehicle can not be moved.

0016Fig. 2 shows one of the embodiment in Fig. 1 corresponding embodiment, However, a further transmission control unit 14 is there in the transmission in the Antitheft system 8 involved. Also, the transmission control unit 14 communicates with the system control unit 9. In contrast to the transmission control unit 6, via which the operation of the valve assembly 7, and thus the frictional connection is controlled, the transmission control unit 14 has other control tasks, which however equally possible, the transmission operation to interrupt. If now above the correct ignition key executed detected, so as well as the transmission control unit 6, the transmission control unit 14 unlocked when requesting permission to take off.

0017However, an invalid key 11 is recognized, also receives the Transmission control unit 14 (corresponding to the transmission control unit 6) no enable signal, since the comparison in terms of the Zündschlüsselidentifikation System controller 9 has shown that it is not original to the Ignition key is and, consequently, the immobilizer as before must remain connected.