Passive remote keyless entry system
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United States of America Patent
Stats
-
May 22, 2001
Grant Date -
N/A
app pub date -
Jun 17, 1998
filing date -
Jun 17, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A passive remote keyless entry system includes a plurality of sensors each associated with a door of the vehicle. Each sensor detects the presence and distance of a key fob from the sensor. By monitoring the distance of the key fob from the sensor, the sensor determines if the key fob is approaching or moving away from the associated door. If the sensor determines that the key fob is approaching, an interrogation signal is sent from the security system to the key fob. If the proper code is returned by the key fob, the associated door is unlocked. If the sensor determines that the key fob is moving away from the associated door, the doors are locked. The sensors can also determine whether the key fob is simply passing by, in which case the driver probably does not wish to enter the vehicle.
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