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US Patent 8698511 Capacitive occupant detection system with interference detection

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Patent abstractTimelineTable: Further ResourcesReferences
Is a
Patent
Patent

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
8698511
Patent Inventor Names
Michael Puetz3
Christoph Wendt3
Darren Khan3
Gianluca Favalli3
Marc Tonteling3
Date of Patent
April 15, 2014
Patent Application Number
13576190
Date Filed
January 26, 2011
Patent Citations Received
‌
US Patent 12000876 Capacitive sensing
1
‌
US Patent 11918381 Vital signs monitoring system
2
Patent Primary Examiner
‌
Huy Q Phan
Patent abstract

A capacitive occupant detection system (10) comprises a sine signal generator (12) to apply a sine voltage signal to an antenna electrode (14) and a current measurement circuit (18, 20, 28, 30, 40) to measure current signals, based upon which a control and evaluation unit determines and outputs an occupancy state. The signal generator (12) is coupled to the antenna electrode via an amplitude adjustment stage (13), configured to adjust the amplitude of said sine voltage signal applied to said antenna electrode to an amplitude selected among at least two discrete amplitudes. The control and evaluation circuit selects one of the discrete amplitudes at a time and causes the amplitude adjustment stage to adjust the amplitude of said the voltage signal applied to the antenna electrode accordingly. The control and evaluation circuit carries out an interference detection mode and an occupant detection mode. In interference detection mode, the current signals are measured while a low one of the at least two discrete amplitudes is selected and it is determined whether the antenna electrode is exposed to interference. In occupant detection mode, the current signals are measured while a high one of the at least two discrete amplitudes is selected and occupancy state is determined based upon the current signals thus measured.

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