Passive remote access control system
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United States of America Patent
Stats
-
May 27, 2003
Grant Date -
N/A
app pub date -
Apr 9, 1999
filing date -
Apr 9, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Access to a motor vehicle is controlled by periodically transmitting an interrogation signal from a control circuit on the vehicle. Upon receiving the interrogation signal, a hand-held remote control transmits a reply signal to the control circuit. The control circuit measures the strength of the reply signal and the activates a first function, such as unlocking a door of the vehicle, when the strength exceeds a first threshold level. Thereafter, when the signal strength exceeds a second threshold level, the control circuit activates a second function, for example enabling the engine to be started. When the signal strength drops below a third threshold activates a third function, such as locking the door.
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