Electronic safety system having an authentication element range determination, particularly a vehicle locking system

• US 6,580,353 B1
• Filed: 03/06/2000
• Issued: 06/17/2003
• Est. Priority Date: 03/06/1999
• Status: Expired due to Term

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Inventors: Geber, Michael, Pohlmann, Andreas, Ohle, Jörn-Marten
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): BROWN, VERNAL U
• Application Number:
  US09/520,012
• Time in Patent Office: 1,198 Days
• Field of Search: 340/5.61, 340/5.6, 340/5.72, 340/570.11, 340/545.2, 340/5.63, 340/5.65, 340/825.69, 340/825.72, 340/10.4, 340/5.62
• US Class Current: 340/5.61
• CPC Class Codes: B60R 25/04 operating on the propulsion system, e.g. engine or drive motor
• CPC Class Codes: B60R 25/245 where the antenna reception area plays a role
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks

Abstract

An electronic safety system, particularly a vehicle locking system, has several safety units arranged on an object to be secured, at least one authorizing authentication element, and safety control devices with several object-side authentication element detection sensors. Signal sending devices emit a query data signal in a pertaining acquisition range, which can be received by an authentication element situated in the corresponding acquisition range. The authentication element has devices for returning an authentication response signal. According to the invention, the query data signals emitted by the detection sensors contain a sensor-specifically coded data protocol range, and the authentication element has devices for analyzing the sensor-specifically coded data protocol range of received query data signals and for generating an authentication response signal which contains a sensor-indicative data protocol range which is coded with the information as to from which detection sensors the authentication element has received a query data signal.

Claims

1. An electronic safety system, comprising:

a plurality of safety units having control devices associated therewith and being adapted to be arranged on an object to be secured;

at least one authorizing authentication element; and

a plurality of authentication element detection sensors, each having a signal sending device for emitting a query data signal within a corresponding acquisition range, which query data can be received by an authentication element situated in the corresponding acquisition range, the authentication element having devices for returning an authentication response signal;

wherein

query data signals emitted by the authentication element detection sensors contain a data protocol field coded with sensor-specific identification information; and

each authentication element has devices for analyzing the data protocol field of received query data signals coded with sensor-specific identification information, and for generating an authentication response signal which contains a sensor-indicative data protocol field that can be analyzed by the control devices, which data protocol field is coded with information that identifies each detection sensor from which the authentication element has received a query data signal.

2. The electronic safety system according to claim 1, wherein, the data protocol field of a respective query data signal coded with sensor-specific identification information contains an identification data block which, for the different detection sensors, is situated at different points within the data protocol field.

3. The electronic locking system according to claim 2, wherein:

the identification data blocks of different detection sensors are situated at mutually separated points within the data protocol field coded with sensor-specific identification information; and

the sensor-indicative data protocol field of the authentication response signal is composed of data signal blocks which, in their data protocol position, correspond to that of a respectively pertaining identification data block of received query data signals.

4. A method for operating a safety system having a plurality of sensor units, each of which monitors an associated acquisition range by emitting a query signal to detect presence of an authorization element within its respective acquisition range, comprising:

each sensor unit emitting a query signal having a unique code which identifies the sensor unit that emitted the query signal;

the authorization element receiving query signals from each sensor unit within whose acquisition range the authorization element is situated; and

in response to receipt of said query signals, the authorization element sending a single authentication response signal which identifies each sensor unit from which a query was received, based on the unique codes contained in received query signals.

5. The method according to claim 4, wherein

each query signal contains an identification block containing said unique code which identifies the sensor unit which emitted the query signal; and

the single authentication response signal contains a corresponding identification block which cumulates unique code information from the identification blocks of received query signals.

6. The method according to claim 5, wherein

query signals are emitted by said sensor unit in time synchronization;

each sensor unit transmits its unique code in a predetermined time segment within the identification block of its query signal; and

predetermined time segments for the respective safety units are staggered in time.

7. The method according to claim, 6 wherein said identification block of said authentication response signal includes each received unique code, in the time same segment in which it was transmitted by a sensor unit which it identifies.

8. An electronic safety system, comprising:

an authorization authentication element; and

a plurality of sensor units, each for monitoring a respective geographic area associated therewith, to detect presence of said authorization authentication element therein, at least some of said geographic areas overlapping each other in part;

wherein

each said sensor unit has means for emitting a query data signal within the geographic area associated therewith;

the query data signal emitted by each sensor unit contains a data protocol field coded with a unique identification information that designates the sensor unit that transmitted said query data signal;

the authorization authentication element has devices for receiving query data signals from said sensor units, and for generating an authentication response signal that contains a data protocol field coded with information that identifies each sensor unit from which a query data signal has been received.