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Vehicle safety device with electronically coded access authorization
| Details |
Inventors: Brinkmeyer, Horst; Hense, Bernd; Daiss, Michael; Schwegler, Gunter;
Assignee: Mercedes-Benz AG (DE)
Primary Examiner: Holloway, III; Edwin C.
Assistant Examiner:
Attorney, Agent or Firm: Evenson, McKeown, Edwards & Lenahan P.L.L.C.
In the new vehicle safety device according to the invention, random code information used to control the release of an electronic drive-away block arrangement consists of a combination of a plurality of partial information generated separately in operationally essential vehicle units which are separated from one another. The partial information is combined in a linking unit connected with these units for total random code information. Even after a code data exchange protocol has been intercepted by an unauthorized person, the latter, because of the structure of the safety device, can operate the vehicle only by replacing all of these units, which renders such unauthorized use by strangers unattractive because of the manipulations and expense required for this purpose. |
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DETAILED DESCRIPTION The invention relates to a safety device for a vehicle, with electronically coded access authorization for enabling a plurality of devices that are indispensable for operation of the vehicle.
Safety devices in which access authorization is tested prior to each vehicle start by sending user code information from a user unit to the vehicle, which information is evaluated in the vehicle, are known as so-called electronic drive-away blocks.
Other known safety devices which utilize unidirectional information transmission (from the user to the vehicle) or bidirectional information exchange between the user and vehicle operate deterministically and/or with secret information stored in the vehicle.
In contrast to such devices, the type of safety device under discussion here has the advantage that the user code information transmitted from the user unit each time depends upon random number information transmitted previously by the vehicle.
This unpredictability of the next code information to be transmitted makes it impossible for an unauthorized person to operate the vehicle after intercepting one or more code transmissions or information exchange processes merely by utilizing the intercepted information, without possessing the user unit.
A safety device of this generic type is disclosed in European patent document EP 0 521 547 A1, in which a central control device on the vehicle incorporates a random code generator, transmitter and a user code evaluation unit that receives the user code information from the user unit and checks for access authorization.
When access authorization is granted, it generates vehicle operation clearance information that lifts the previously activated drive-away block which keeps one or more operationally relevant devices on the vehicle inactive, in a known manner.
U.
S.
Pat.
No.
5,146,215 teaches a safety device with unidirectional code transmission from the user key to a receiver on the vehicle, with a control unit connected thereto.
In this safety device, the user key can be switched to programmed operation in which it transmits programmed information to the vehicle that causes the received code to be stored in the control unit as a valid user code
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