Door position sensing system with reduction of noise generated by dynamic ferromagnetic components
AssigneeSchlage Lock Company LLC
InventorsMark A. Ross, Nicholas Long
Life of this patent
Estimating the term…
Abstract
An electronic lock device according to one embodiment includes a first magnetometer, a second magnetometer, a dynamic ferromagnetic component positioned between the first magnetometer and the second magnetometer, a processor, and a memory comprising a plurality of instructions stored thereon that, in response to execution by the processor, causes the electronic lock device to read sensor data from the first magnetometer and the second magnetometer, modify the sensor data to generate compensated sensor data that compensates for magnetic noise generated by the dynamic ferromagnetic component, and determine whether the door is in a closed state or an open state based on the compensated sensor data.
Claims20
An electronic lock device adapted to be secured to a door, the electronic lock device comprising:
- a first magnetometer;
- a second magnetometer;
- a dynamic ferromagnetic component positioned between the first magnetometer and the second magnetometer;
- a processor;
- and
- a memory comprising a plurality of instructions stored thereon that, in response to execution by the processor, causes the electronic lock device to:
- read sensor data from the first magnetometer and the second magnetometer;
- modify the sensor data to generate compensated sensor data that compensates for magnetic noise generated by the dynamic ferromagnetic component;
- and
- determine whether the door is in a closed state or an open state based on the compensated sensor data.
An access control system, comprising:
- a permanent magnet positioned at a door frame and structured to generate a first magnetic field;
- and
- an access control device configured to determine whether the door is in an open state or a closed state based on the first magnetic field sensed by the access control device, wherein the access control device includes:
- a mechanical component having dynamic motion and adapted to generate a second magnetic field as a result of the dynamic motion;
- a first sensor configured to sense magnetic fields within a vicinity of the first sensor and positioned between the permanent magnet and the mechanical component in a first dimension;
- and
- a second sensor configured to sense magnetic fields within a vicinity of the second sensor;
- wherein the mechanical component is positioned between the first sensor and the second sensor in the first dimension.
Dependencies are inferred from the claim text.