Lock device having position sensor

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:

• 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.

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:

• 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.

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:

• 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.