Title: Capacitive physical quantity sensor and method of diagnosing the same
Application Number: 200610163090 Application Date: 2006.11.30
Publication Number: 1975344 Publication Date: 2007.06.06
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01D18/00;G01D5/24;G01P15/125;G01P21/00
Applicant(s) Name: Denso Corp. Address:
Inventor(s) Name: Goto Keisuke
Attorney & Agent: linjin hui
Abstract:
    A capacitive sensor for detecting a physical quantity includes a movable electrode and a fixed electrode, and a controlling unit for applying a signal between the movable electrode and the fixed electrode. The controlling unit includes an input terminal, an output terminal, and a time measuring means for measuring a time period. The controlling unit measures the time period, for which a diagnosis instruction signal is input into the input terminal. The controlling unit performs the self-diagnosis, after the instruction signal continues for a predetermined time period.
Time: 11