WINDOW SENSING DEVICE WITH MOVEMENT DETECTION

• US 20180357866A1
• Filed: 12/29/2016
• Published: 12/13/2018
• Est. Priority Date: 12/31/2015
• Status: Active Grant

• Current Assignee: Bosch Security Systems Incorporated (Robert Bosch GmbH), Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: DiPoala, William
• Granted Patent: US 10,460,578 B2
• Time in Patent Office: Days
• CPC Class Codes: G01D 5/06 acting through a wall or enclosure, e.g. by bellows, by magnetic coupling
• CPC Class Codes: G01D 5/145 influenced by the relative movement between the Hall device and magnetic fields see G01R33/06
• CPC Class Codes: G01P 15/131 with electrostatic counterbalancing means
• CPC Class Codes: G05G 2009/04755 Magnetic sensor, e.g. hall generator, pick-up coil
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
• CPC Class Codes: G08B 13/1436 with motion detection
• CPC Class Codes: G08B 25/008 Alarm setting and unsetting, i.e. arming or disarming of the security system
• CPC Class Codes: G08B 25/009 Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range

Abstract

A window sensing device with movement detection enables use of a window sensing arrangement to provide an indication even when a window sash that is open is moved, while an alarm system is armed. The window sensing device includes an accelerometer configured to sense movement of a window sash in a given direction. A magnetic sensor is configured to sense presence of a magnet when the window sash is in a closed position. An electronic controller outputs a normal state wireless signal when the magnetic sensor senses the magnet and outputs an alarm state wireless signal when the magnetic sensor does not sense the presence of the magnet. When the electronic controller is outputting an alarm state wireless signal and the accelerometer senses movement of a window sash, the electronic controller outputs an indication of movement of a window sash in a given direction.

Claims

1. A window sensing device for securing to a window sash comprising:

a housing,

an accelerometer configured to sense movement of a window sash in a given direction of travel,

a magnetic sensor configured to sense presence of a magnet,

a wireless transmitter circuit, and

an electronic controller configured to receive an input from the accelerometer and an input from the magnetic sensor, the electronic controller configured to control the wireless transmitter circuit to output a normal state wireless signal when the magnetic sensor senses the presence of the magnet and to output an alarm state wireless signal when the magnetic sensor does not sense the presence of the magnet, and when the electronic controller is controlling the wireless transmitter circuit to output an alarm state wireless signal and the accelerometer senses movement of a window sash, the electronic controller is configured to output an indication of movement of a window sash.

2. The window sensing device according to claim 1, wherein the indication of movement provided by the electronic controller when the electronic controller is controlling the wireless transmitter circuit to output an alarm state wireless signal includes changing the output of the wireless transmitter circuit to a normal state wireless signal for a predetermined time and then changing the output to an alarm state wireless signal.

3. The window sensing device according to claim 2, wherein the accelerometer only senses positive or negative movement of the window sensing device in the given direction of travel of a window sash.

4. The window sensing device according to claim 1, wherein the indication of movement provided by the electronic controller when the electronic controller is controlling the wireless transmitter circuit to output an alarm state wireless signal includes transmitting a separate wireless accelerometer output signal in addition to the alarm state wireless signal or the normal state wireless signal.

5. The window sensing device according to claim 4, wherein the accelerometer provides acceleration signals for the X, Y and Z axes to the electronic controller, wherein one of the axes corresponds to movement for opening or closing of a window sash.

6. The window sensing device according to claim 5, wherein the electronic controller is configured to provide a window tampering wireless signal in response to one of the acceleration signals not corresponding to a given direction of movement of a window sash exceeding a threshold value.

7. The window sensing device according to claim 6, wherein the window tampering wireless signal represents acceleration signals sensed by the accelerometer that correspond to a breaking of a glass window.

8. The window sensing device according to claim 1, wherein the accelerometer only senses positive or negative movement of the window sensing device in the given direction of travel of the window sash.

9. The window sensing device according to claim 1, wherein the accelerometer, the magnetic sensor, the wireless transmitter circuit, and the electronic controller are disposed in the housing and the housing is secured to a window sash.

10. The window sensing device according to claim 1, wherein the accelerometer, the magnetic sensor, the wireless transmitter circuit, and the electronic controller are disposed in the housing and the housing is secured to a sliding door having a window.

11. The window sensing device according to claim 1, wherein the accelerometer, the magnetic sensor, the wireless transmitter circuit, and the electronic controller are disposed in the housing and the housing is secured to a sliding door.

12. A magnetic window sensing arrangement for a window arrangement comprising:

a magnet assembly having a single magnet secured to a window frame;

a window sensing device secured to a window sash, including;

a housing,

an accelerometer configured to sense movement of a window sash in a given direction of travel,

a magnetic sensor configured to sense presence of a magnet,

a wireless transmitter circuit, and

an electronic controller configured to receive an input from the accelerometer and an input from the magnetic sensor, the electronic controller configured to control the wireless transmitter circuit to output a normal state wireless signal when the magnetic sensor senses the presence of the magnet and to output an alarm state wireless signal when the magnetic sensor does not sense the presence of the magnet, and when the electronic controller is controlling the wireless transmitter circuit to output an alarm state wireless signal and the accelerometer senses movement of a window sash, the electronic controller is configured to output an indication of movement of a window sash.

13. The window sensing device according to claim 12, wherein the indication of movement provided by the electronic controller when the electronic controller is controlling the wireless transmitter circuit to output an alarm state wireless signal includes changing the output of the wireless transmitter circuit to a normal state wireless signal for a predetermined time and then changing the output to an alarm state wireless signal.

14. The window sensing device according to claim 13, wherein the accelerometer only senses positive or negative movement of the window sensing device in the given direction of travel of a window sash.

15. The window sensing device according to claim 12, wherein the indication of movement provided by the electronic controller when the electronic controller is controlling the wireless transmitter circuit to output an alarm state wireless signal includes transmitting a separate wireless accelerometer output signal in addition to the alarm state wireless signal or the normal state wireless signal.

16. A method for arming and operating window sensing devices, comprising:

receiving an actuation or input from a user interface to arm an alarm system;

detecting with the window sensing devices that at least one window sash is open, and providing an indication to the user interface indicating which one or more of a plurality of windows sashes is open and blocking an arming of the alarm system;

receiving an actuation or input from a user interface to bypass open window sashes and arm the alarm system;

arming the window sensing devices of closed window sashes while blocking alarm state wireless signals from one or more open window sashes from triggering an alarm; and

when an accelerometer of one of the window sensing devices senses movement of an open window sash, receiving an indication of the movement from the said window sensing device.

17. The method according to claim 16, wherein receiving an indication of the movement from the said window sensing device includes receiving a normal state wireless signal from a wireless transmitter circuit of the window sensing device for a preselected time and subsequently receiving an alarm state wireless signal from the window sensing device.