Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1995-07-11
1998-04-07
Hofsass, Jeffery
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340566, 340689, 180281, 180282, 180271, B60R 2510
Patent
active
057369232
ABSTRACT:
An apparatus and method for sensing motionlessness for sensing motionlessness in a land-based vehicle is provided. The apparatus can include an inertial measurement unit (IMU) mounted in a predetermined orientation on the vehicle and a programmable computer. The IMU can have an inertial sensor which generates a plurality of motion signals. More than one inertial sensor can be used and, in that case, each of the sensors can be mounted in a second predetermined orientation with respect to the others, such as an orthogonal orientation, thereby creating a selected spatial reference frame. The inertial sensor can be one or more accelerometers, or one or more gyroscopes, or an accelerometer-gyroscope combination. The computer receives the motion signals and determining a motion state of the vehicle therefrom. The computer provides the motion state to a target application which acts in accordance therewith. The method can include sensing a reference sample of motion signals during a reference period; extracting a reference characteristic signal from the reference sample; sensing an operational sample during an operational period; extracting an operational characteristic signal from the operational sample; determining the current motion state by comparing the operational characteristic signal to the reference characteristic signal; reporting the motion state to a target application in the vehicle, the application acting in accordance therewith.
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Hofsass Jeffery
Lieu Julie B.
Union Switch & Signal Inc.
LandOfFree
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