Patent ID: 9442018
Filing Date: 2016-09-13
CPC Classification: G01J,G01N,G08B,H05B,Y02B

Claim Text:
1. A method of controlling a passive infrared sensor, said sensor controlling whether an electrical device is switched on or off, and comprising at least two sensor elements, each sensor element having a lens for focusing IR onto itself, the method comprising the steps of: saving a time and an identification of a first sensor element detecting the presence, sending a switch-on signal to said electrical device, setting a switch off delay duration to a first delay duration, determining if no presence is detected during the first delay duration, and sending a switch-off signal to said electrical device if no presence is detected during the first delay duration, and in response to determining that presence is detected by a second sensor element before the first delay duration has ended and during a time period that is less than a predetermined time period from a last triggered event from the first sensor element, increasing the switch off delay duration to a second delay duration that is greater than the first delay duration such that the switch-off signal is sent to said electrical device in response to determining that no presence is detected during the second delay duration, wherein information of detected presence from said at least two sensor elements are used to decrease false triggers.