DE19845649B4 - Keyless entry and / or driving authorization control device for a motor vehicle - Google Patents

Abstract

Keyless access and / or driving authorization control device for a motor vehicle with a motor vehicle side transceiver unit and with a mobile identification transmitter (ID transmitter), which motor vehicle side transceiver device two transmitter side associated transmitter modules (2, 3) for transmitting a signal on a low-frequency radio link and a receiving unit for receiving a response signal sent by the ID transmitter (6) and which ID transmitter (6) comprise a transceiver, characterized in that both the transmitter modules (2, 3) arranged on the motor vehicle and the transmitters Antenna unit of the ID transmitter in each case two orthogonally arranged antenna coils (A ₁ , A ₂ , B ₁ , B ₂ ), which antenna coils (A ₁ , A ₂ , B ₁ , B ₂ ) of a transmitter module (2, 3) with respect are so differently driven to at least one transmission parameter that the spatial vectorial exercises The storage of the fields changes constantly.

Description

The This invention relates to the field of keyless entry and / or drive authorization control devices. In particular, the invention relates to a keyless access and / or driving authorization control device for a Motor vehicle with a motor vehicle side transceiver unit and with a mobile identification transmitter (ID transmitter), which motor vehicle side Transceiver device two different vehicle sides associated transmitter modules for transmitting a signal on a low-frequency radio link and a receiving unit for receiving a message sent from the ID transmitter Response signal and which ID transmitter include a transceiver.

Keyless locking systems are used in numerous applications, for example in motor vehicles to increase used for ease of use. Conventionally are called remote control systems Infrared or radio systems used in which the authorized User actively activates the ID transmitter, to a signal to the base station, for example to a motor vehicle provided receiving unit for opening of the vehicle. To further increase the ease of use one has now passed in motor vehicles, developing passive access and / or driving authorization control systems so that the entitled, a valid ID donors with accompanying users to open his motor vehicle can operate without actively activating the ID transmitter.

A Such device is from the articles "A vehicle safety system without mechanical Key "by Ch. Schneider and U. Schrey, published in: "Automobiltechnische Magazine 96 "(1994) No. 5 and "smart card farewell to Car Keys "by U. Schrey, Ch. Schneider and M. Siedentrop, published in: "Siemens Magazine 1/96" known. In the access and / or driving authorization control device described in these documents consists essentially of a motor vehicle assigned Transceiver and from a mobile ID transmitter. The transceiver comprises three transmitter modules operating in the inductive frequency range, of which each one of the driver's door side, another of the passenger door side and the third are associated with the vehicle rear. The transmitter antenna designed as a coil a NF transmitter is in the respective side door or in the rear bumper integrated. Each transmitter module is associated with that of the respective door door handle or boot button connected in such a way that when you press this one Vehicle assigned transmitter module a low-frequency question signal sends. The remaining Transmitter modules, on the other hand, remain quiet and do not send any signals.

The The motor vehicle associated transceiver is also with an RF receiver equipped to receive an RF signal from the ID transmitter. The one received with the RF receiver Response signal from the ID transmitter is applied to a processor equipped control unit, in which the received response signal on its validity is checked. If the ID transmitter is recognized as authorized, a corresponding Control signal to the respective door locking mechanism to unlock those doors given, the door handle previously operated has been.

Another generic access and / or driving authorization control device for a motor vehicle is off DE 195 42 441 C2 known. The access and / or driving authorization control device described in this document has vehicle-side antenna devices, each consisting of two individual antennas. The two individual antennas lie as close together as possible and are controlled with a phase shift with a phase angle of 45 °. When transmitting sinusoidal signals, a magnetic field is created with a reciprocating maximum signal. In this way, a location of the transponder, which then sends a response signal when the transponder coil is arranged or is moved in such a way that a sufficient number of field lines are cut from this.

Consequently In this prior art antenna device becomes a magnetic field generates that in a given, also called catch area Range is effective. Within such a catch area must the transponder is located to return a response code signal can.

Out DE 36 27 193 A1 is another known keyless entry system for a vehicle. The transmission module arranged on the transmitter module has two mutually orthogonal antenna coils.

For proper operation of such access and / or driving authorization control device, it is necessary to recognize whether the ID transmitter is located inside or outside the motor vehicle. The fact that the ID transmitter is located inside the motor vehicle can be determined by the fact that both the request signal sent by the driver's door assigned to the transmitter module and the request signal transmitted by the co-driver's door receive the request signal and send the corresponding response signals from the ID transmitter become. Here is the over cutting area of the two transmitter modules designed so that they actually overlap only in the interior of the vehicle. However, a problem with such an ID transmitter detection in the motor vehicle interior is that a detection is only possible if the receiving coil of the ID transmitter is oriented so that it is flooded by the radiated from the transmitting antenna of a transmitter module field. However, since an orientation of the receiver coil can theoretically be found for any location in the room where there is no flooding, it may happen that a desired engine start is prevented or the door lock is closed because non-receipt of a response signal indicates that the ID transmitter is outside the reception range of the request signal and thus has moved away from the motor vehicle again.

outgoing from this discussed prior art, the invention therefore lies the task is based, a generic keyless access and / or To provide driving authorization control device, with the independent of the orientation of the receiving antenna of the ID transmitter secure ID encoder detection inside and outside the Motor vehicle interior possible is.

These Task is solved on the one hand, that both the signal sending Motor vehicle side arranged transmitter modules and the antenna unit of the ID transmitter in each case two orthogonally arranged antenna coils which antenna coils of a transmitter module with respect to at least one transmission parameter so differently controlled are that yourself the spatial vectorial overlay the fields are constantly changing.

Further This object is achieved by the invention solved, that the the question signal transmitting motor vehicle side arranged transmitter modules three orthogonally arranged antenna coils and the ID transmitter an antenna coil include.

With the keyless Access and / or driving authorization control device according to the first Suggested solution is exploited that by the overlay the transmitted waves of the two with respect to a transmission parameter differently controlled antenna coils of a transmitter module instead one with conventional Facilities achievable locally fixed extinction an extinction referred to a determinable location only occurs temporarily. By the overlay a hike takes place of the place of extinction in the room. At a mission in each case two antenna coils assigned to a transmitter module an orthogonal arrangement moves the location of the temporary extinction on trajectories. An ID transmitter to be detected in the vehicle interior then at most only for a short period of time in such an extinction area. Here is the different control of the two antenna coils designed so that the Movement of the shifting extinction area is so fast that one impairment an ID encoder detection is not given. Consequently, in the motor vehicle ID-encoders in each possible one Alignment can be detected to the transmitter modules.

One such transmit parameters for operating the orthogonal differently arranged antenna coils of a transmitter module can, for example be the transmission frequency. By simultaneously driving the two Antenna coils on different frequencies creates a beating, in which the phase angles of the fields constantly shift, so that the quasi stationary Character of the sent fields is canceled by the maxima and minima in the room are thus no longer stationary. The Beat frequency gives a measure of how fast the phases of the fields shift to each other and thus how fast is the extinction area emotional.

In a further embodiment is provided that the Although both antenna coils of the transmitter modules gleichfrequent, however are driven differently amplitude modulated. The self-adjusting overlay the amplitude-modeled transmission signals leads to a corresponding Hike the extinction areas and thus to a comparable result as the one shown above Operation of an access and / or driving authorization control device, in which the two antenna coils of a transmitter module with different Frequencies are controlled.

According to the second Suggested solution is provided to everyone vehicle arranged transmitter module three orthogonal to each other arranged antenna coils are assigned. By the arrangement the three antenna coils to each other, with the same or as well shown above operated with different transmission parameters can be can be an ID transmitter in any position in the motor vehicle be detected even if this only a single Antenna coil has as a receiving antenna. Consequently, there is a signal reception possible from the antenna coil of the ID transmitter in any position.

is a higher one detection resolution desired within the motor vehicle, the motor vehicle a or several other transmitter modules on to the first two motor vehicle pages be arranged different motor vehicle pages.

Further Embodiments of the invention and developments are part the rest under claims as well as the following description of an embodiment with reference on the attached Characters. Show it:

1 a schematic representation of a motor vehicle 1 with a keyless entry and / or driving authorization control device,

2 a simplified schematic representation of self-adjusting field overlay during operation of the access and / or driving authorization control of the 1 ,

The keyless entry and / or drive authorization control device comprises two transmitter modules 2 . 3 , each in a B-pillar 4 . 5 of the motor vehicle 1 are arranged. The transmitter modules 2 . 3 are connected to non-illustrated control and evaluation units. The access and / or driving authorization control device further comprises ID transmitters 6 who is in the representation of 1 in high magnification, for example, on the driver's seat F is located.

Each transmitter module 2 . 3 comprises two antenna coils A ₁ , A ₂ provided for transmitting low-frequency signals, which are each in an orthogonal arrangement to one another. The orientation of the Antennenspu len A ₁ is parallel to the longitudinal extent of the motor vehicle 1 ; the orientation of the antenna coils A ₂ is substantially in the vertical direction and thus corresponding to the longitudinal extent of the B-pillar 4 respectively. 5 , The ID transmitter 6 also comprises two antenna coils B ₁ , B ₂ , which are arranged orthogonal to each other. The orientation of the antenna coil B _{1 is} corresponding to the transverse direction of the ID transmitter 6 ; the orientation of the antenna coil B ₂ extends in the longitudinal direction.

In the 1 The keyless entry and / or driving authorization control device shown works as follows: Approaches the ID transmitter 6 entraining person the motor vehicle and is operated by this person the door handle, for example, the driver's door handle, the transmitter modules 2 . 3 for time-shifted, cyclic transmission of coded signals. The signal may include information for identifying the respective transmitter module 2 or 3 contain. That of the transmitter module 2 signal sent after pressing the door handle of the driver's door is from the ID transmitter 6 received and sent back on another radio link to a arranged in the motor vehicle transceiver unit. After a positive conclusion of a validity check the door lock is opened, so that the ID transmitter 6 accompanying users in the motor vehicle 1 can get in.

The antenna coils A ₁ , A _{2 of} the transmitter modules 2 . 3 are operated at a fundamental frequency of about 8 kHz, the antenna coils A ₁ at 8 kHz and the antenna coils A _{2 are operated} at 8.5 kHz. Both antenna coils A ₁ , A _{2 of} a transmitter module 2 respectively. 3 simultaneously send the signal. The frequency offset sets a beat with a beating frequency of 500 Hz. Due to the hover-related shift of the phase positions of the fields to each other, the vectorial sums of the fields change constantly at each location. Therefore, receipt of the request signal from the ID transmitter 6 in any spatial position of the antenna coils B ₁ , B _{2 of} the ID transmitter 6 possible. Any accidental temporary erasure is of such short duration that this does not result in any appreciable delay in the desired procedure.

The hover - related shift of the phase angles of the fields to each other is in a simplified representation of 2 refer to.

This Diagram represents the manner of a three-dimensional representation of the with respect a place adjusting time shift of extinction. The beam angle is on the x-axis, the time on the y-axis (t) and on the z-axis the field strength (F) applied. When looking at the time axis (t), it becomes clear that about the Time seen in the diagram as a minimum extinction areas in a place only temporary enter. A stationary and thus temporally unchanging extinction would become in a parallel to the time axis (t) running minimum noticeable do.

After unlocking the driver's door, the user steps up with the ID transmitter 6 in the motor vehicle 1 a, so that the ID transmitter 6 is located in the area of the driver's seat F. Due to the time-shifted cyclic transmission of the question signals by the transmitter module 2 and the transmitter module 3 be from the ID transmitter 6 in accordance with cyclic sequence response signals containing a transmitter module identification concerning the transmitter module 2 or the transmitter module 3 returned. The transmission range of the two transmitter modules 2 . 3 is tuned so that these only within the vehicle 1 overlap. Will the ID transmitter 6 from the motor vehicle 1 taken out, this receives only the signals, for example, the transmitter module 2 , so that according to the ID-giver 6 only response signals containing the transmitter identification of the transmitter module 2 be sent back to the motor vehicle side transceiver unit. Accordingly, a door lock can then follow.

1

motor vehicle

2

transmitter module

3

transmitter module

4

B-pillar

5

B-pillar

6

ID transmitter

A ₁ -A ₂

antenna coil

B ₁ -B ₂

antenna coil

F

driver's seat

Claims (8)

Keyless access and / or driving authorization control device for a motor vehicle with a motor vehicle side transceiver unit and with a mobile identification transmitter (ID transmitter), which motor vehicle side transceiver device assigned to two different vehicle sides transmitter modules ( 2 . 3 ) for transmitting a signal on a low-frequency radio link and a receiving unit for receiving one of the ID transmitter ( 6 ) and which ID transmitter ( 6 ) comprise a transceiver part, characterized in that both the signal transmitting the motor vehicle side arranged transmitter modules ( 2 . 3 ) and the antenna unit of the ID transmitter each comprise two orthogonally arranged antenna coils (A ₁ , A ₂ ; B ₁ , B ₂ ), which antenna coils (A ₁ , A ₂ ; B ₁ , B ₂ ) of a transmitter module ( 2 . 3 ) are differently controlled with respect to at least one transmission parameter in such a way that the spatial vectorial superposition of the fields changes continuously. Device according to claim 1, characterized in that the antenna coils (A ₁ , A ₂ ) of the transmitter modules are driven with different frequencies, wherein a beat in the superimposed field is caused by the superposition of the two transmitted frequencies. Device according to claim 1, characterized that the Antenna coils of the transmitter modules equal frequency and different are controlled amplitude modulated. Access and / or driving authorization control device according to one of Claims 1 to 3, characterized in that one of the two antenna coils (A ₁ ) of a transmitter module (A ₁ ) 2 . 3 ) is aligned with its longitudinal axis parallel to the motor vehicle longitudinal extension and the other antenna coil (A ₂ ) in the vertical direction. Device according to one of claims 1 to 4, characterized that the Transmitter modules each have a third antenna coil in an orthogonal Arrangement to the other two Antenna coils is assigned. Keyless Access and / or driving authorization control device for a motor vehicle with a vehicle-side transceiver unit and with a mobile ldentifikationsgeber (ID transmitter), which motor vehicle side Transceiver device associated with two different vehicle sides Transmitter modules for transmitting a signal on a low-frequency Radio link and a receiving unit for receiving one of the ID transmitter transmitted response signal and which ID transmitter a transceiver comprise, characterized in that the signal transmitting Motor vehicle side arranged transmitter modules three orthogonal to each other arranged antenna coils and the ID transmitter comprise an antenna coil. Device according to claim 6, characterized that the Antenna coils a transmitter modules with regard to at least one Transmission parameters are controlled differently in such a way that the spatial vectorial overlay the fields are constantly changing. Device according to one of claims 1 to 7, characterized that in addition to the two transmitter modules one or more further transmitter modules in Motor vehicle are arranged.