Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1997-02-27
1999-01-05
Mullen, Jr., Thomas J.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
3404255, 367 93, 367 94, 307 102, B60R 2510
Patent
active
058567780
ABSTRACT:
An intrusion detecting apparatus for a vehicle comprises: a doppler shift signal outputting unit for outputting a doppler shift signal in response to a reflected and received ultrasonic signal from an ultrasonic receiver and a transmitted ultrasonic signal from a transmitter, an envelope detecting circuit for detecting the level of the received ultrasonic signal, and a detecting means for detecting an illegal intrusion by a person only when it is determined that the doppler shift signal is within a predetermined amount corresponding to the movement of a person intruding into the passenger compartment and it is also determined that the detected level of the received ultrasonic signal is out of a range of a disturbance, whereby an erroneous detection due to a disturbance caused by some reason other than an intrusion can be prevented.
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Goto Masahiro
Hayashi Ikuo
Kani Hiroyuki
Tsuzuki Takeo
Denso Corporation
Mannava Ashok
Mullen Jr. Thomas J.
Nippon Soken Inc.
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