Title:
安全装置
Document Type and Number:
Japanese Patent JP4404485
Kind Code:
B2
Abstract:
A vehicle safety device includes a vehicle mounted transceiver for transmitting an inquiry or "challenge" code to an operator-carried transponder which processes the challenge code according to a secret algorithm (which is present also in the vehicle unit), and transmits a response code to the vehicle. The transponder also includes a processor for superimposing on the response code additional information which must be present in order for the vehicle unit to recognize the response as valid. In a preferred embodiment, the bits constituting the response code are transmitted at differing power levels which depend on the data content of the response code.
Inventors:
Bartz Rüdiger
Application Number:
JP2000556119A
Publication Date:
January 27, 2010
Filing Date:
June 22, 1999
Export Citation:
Assignee:
BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT
International Classes:
E05B49/00; G07C9/00
Domestic Patent References:
| JP9303014A | ||||
| JP9185690A |
Attorney, Agent or Firm:
Fujita Akira