LOCK DEVICE HAVING POSITION SENSOR
First Claim
1. A lock device comprising:
- a magnet, the magnet providing a reference magnetic field;
a magnetometer structured to measure a location of the magnetometer relative to the reference magnetic field; and
a processing device structured to execute instructions stored on a non-transitory computer readable medium that cause the processing device to;
receive the location measurement of the magnetometer;
derive a position indicator from the location measurement of the magnetometer;
compare the position indicator to a reference indicator, the reference indicator corresponding to the location of the magnetometer when the magnetometer is at a reference position; and
determine, based on the comparison of the position indicator to the reference indicator, whether the magnetometer is at the reference position.
1 Assignment
0 Petitions
Accused Products
Abstract
A position sensing system and method for detecting the displacement of a door from a reference position, such as, for example, from a closed position. The system includes a magnetometer that may be operably connected to the door, and which measures positional location relative to a reference magnetic field, such as, for example, a magnetic field provided by a magnet of a lock device. The system may also include an accelerometer that detects acceleration of the door, and thereby provides an indication of when location is to be measured by the magnetometer. Measurement information from the magnetometer is used to derive a position indicator that is compared to a reference indicator, the reference indicator being associated with the reference position. Differences between the position and reference indicators may provide an indication that the door has been moved from the reference position.
-
Citations
20 Claims
-
1. A lock device comprising:
-
a magnet, the magnet providing a reference magnetic field; a magnetometer structured to measure a location of the magnetometer relative to the reference magnetic field; and a processing device structured to execute instructions stored on a non-transitory computer readable medium that cause the processing device to; receive the location measurement of the magnetometer; derive a position indicator from the location measurement of the magnetometer; compare the position indicator to a reference indicator, the reference indicator corresponding to the location of the magnetometer when the magnetometer is at a reference position; and determine, based on the comparison of the position indicator to the reference indicator, whether the magnetometer is at the reference position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A position sensing system for detecting the displacement of a door from a closed position, the position sensing system comprising:
-
a lock device having a latch mechanism and a door strike; a magnet, the magnet providing a reference magnetic field; a sensor having a magnetometer and an accelerometer, the magnetometer configured to measure a location of the magnetometer relative to the reference magnetic field, the accelerometer configured to detect an acceleration of the door; and a processing device structured to derive a position indicator from the location measured by the magnetometer, the processing device further configured to compare the position indicator to a reference indicator, the reference indicator indicative of the location of the magnetometer when the door is in the closed position. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. A method for determining whether a door has been displaced from a reference position, the method comprising:
-
measuring a reference location of a magnetometer relative to a reference magnetic field when the door is at the reference position; deriving, by a processing device of a lock device, a reference indicator from the measured reference location; recording in the memory of the lock device the reference indicator; measuring, by the magnetometer, a position location of the magnetometer relative to the reference magnetic field; deriving, by the processing device, a position indicator from the measured position location; comparing, by the processing device, the position indicator and the reference indicator; and determining, by the processing device, from the comparison of the position and reference indicators whether the door has been displaced from the reference position. - View Dependent Claims (17, 18, 19, 20)
-
Specification