Lock device having position sensor
First Claim
1. A lock device for a door having an open position, a closed position, and positions therebetween with respect to an adjacent structure defining an entryway, the lock device comprising:
- a magnet, the magnet providing a reference magnetic field, the magnet being located at one of the door and the adjacent structure;
a magnetometer structured to measure a location of the magnetometer relative to the magnet as provided by the reference magnetic field, the magnetometer being located at the other of the door and the adjacent structure;
an accelerometer structured to detect an acceleration of the lock device, the processing device being further structured to generate a signal to wake-up the magnetometer from a low power mode in response to detection of the acceleration; and
a processing device structured to execute instructions stored on a non-transitory computer readable medium that causes the processing device to;
receive the location measurement of the magnetometer;
derive a position indicator from the location measurement of the magnetometer, wherein the position indicator indicates one of the positions of the door with respect to the adjacent structure;
compare the position indicator to a reference indicator, the reference indicator corresponding to the location of the magnetometer with respect to the magnet 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.
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Citations
20 Claims
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1. A lock device for a door having an open position, a closed position, and positions therebetween with respect to an adjacent structure defining an entryway, the lock device comprising:
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a magnet, the magnet providing a reference magnetic field, the magnet being located at one of the door and the adjacent structure; a magnetometer structured to measure a location of the magnetometer relative to the magnet as provided by the reference magnetic field, the magnetometer being located at the other of the door and the adjacent structure; an accelerometer structured to detect an acceleration of the lock device, the processing device being further structured to generate a signal to wake-up the magnetometer from a low power mode in response to detection of the acceleration; and a processing device structured to execute instructions stored on a non-transitory computer readable medium that causes the processing device to; receive the location measurement of the magnetometer; derive a position indicator from the location measurement of the magnetometer, wherein the position indicator indicates one of the positions of the door with respect to the adjacent structure; compare the position indicator to a reference indicator, the reference indicator corresponding to the location of the magnetometer with respect to the magnet 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)
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9. A position sensing system for detecting the displacement of a door from a closed position to an open position and to a positions therebetween with respect to an adjacent structure defining an entryway, the position sensing system comprising:
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a lock device having a latch mechanism and a door strike; a magnet, the magnet providing a reference magnetic field, wherein the magnet is located at one of the door and the adjacent structure; a sensor located at the other of the door and the adjacent structure, the sensor having a magnetometer and an accelerometer, the magnetometer configured to measure a location of the magnetometer relative to the reference magnetic field provided by the magnet, the accelerometer configured to detect an acceleration of the door based on the reference magnetic field provided by the magnet, wherein the accelerometer upon detecting the acceleration of the door generates a wake-up command to cause the magnetometer to measure the location of the magnetometer relative to the reference magnetic field; and a processing device structured to derive a position indicator of the door in one of the open position, the closed position, and positions therebetween, 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 (10, 11, 12, 13, 14)
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15. A method for determining whether a door has been displaced from a reference position, wherein the reference position is one of an open position, a closed position, and a position located between the open position and the closed position, the method comprising:
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measuring a reference location of a magnetometer relative to a reference magnetic fields provided by a magnet 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; delivering polling signal to the magnetometer to wake the magnetometer from a low power mode upon an acceleration provided by an accelerometer; measuring, by the magnetometer, a position location of the magnetometer relative to the reference magnetic field provided by the magnet; 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 to one of the open position, the closed position, and the position located between the open position and the closed position. - View Dependent Claims (16, 17, 18, 19)
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20. A method for determining whether a door has been displaced from a reference position, wherein the reference position is one of an open position, a closed position, and a position located between the open position and the closed position, the method comprising:
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measuring a reference location of a magnetometer relative to a reference magnetic field provided by a magnet 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 provided by the magnet; 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 to one of the open position, the closed position, and the position located between the open position and the closed position delivering a polling signal to the magnetometer to wake the magnetometer from a low power mode, and, whereupon awakening, the method further comprises measuring, by the magnetometer, a position location, wherein the delivering the polling signal includes delivering the polling signal to wake the magnetometer upon one of i) an acceleration provided by an accelerometer; and
ii) a change in door position.
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Specification