Abstract
The sensor (100) has a frequency controller (222) coupled with a frequency bridging signal generating circuit (104) to vary a frequency of periodic signals. A receiver circuit (106) is coupled with a set of electrodes (102, 112) to receive frame frequency bridging signals (116, 117) based on a capacitance (Cmess) of the electrode (102). An evaluation circuit (108) is coupled with the receiver circuit to determine a capacitive value based on the received frequency bridging signals. Independent claims are also included for the following: (1) a method for detecting a capacity or capacity change (2) a computer program having a set of instructions to perform a method for detecting a capacity or capacity change.
Translated title of the contribution | Capacity sensor for detecting presence of person or object in seat, for automobile's intelligent airbag system, has evaluation circuit coupled with receiver circuit to determine capacitive value based on received frequency bridging signals |
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Original language | German |
Patent number | DE102007058707 |
IPC | G01D 5/ 24 A I |
Priority date | 6/12/07 |
Publication status | Published - 10 Jun 2009 |