PROCESS TO SECURE KEYLESS ENTRY COMMUNICATIONS FOR MOTOR VEHICLES
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United States of America Patent
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N/A
Issued Date -
Oct 21, 2010
app pub date -
Apr 15, 2010
filing date -
Apr 16, 2009
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Process to control access authorization for a motor vehicle. Using an activation circuit in the vehicle, a radio signal is sent out, and an ID transmitter which is carried by the user receives the radio signal and verifies it with an evaluation circuit. If verification is successful, the ID transmitter sends out a high frequency release signal which is received by the vehicle. The activation circuit activates an oscillating circuit so that the oscillation rise time of the oscillating circuit is varied in dependency of a randomly generated parameter, wherein the power supply of the oscillating circuit is controlled in dependency of the parameter. An expected system run time is determined using actual system run times, and included into the evaluation in order to prevent extensions of the radio distance.
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