A capacitance type occupant sensor includes an electrostatic sensing unit, a reference electrode, a voltage applying portion, a current sensing portion, a capacitance calculating portion, and a discriminating portion. The reference electrode is applied with a reference potential. The electrostatic sensing unit is disposed in a vehicle seat, and includes a main electrode, a guard electrode and a noise electrode. The guard electrode is disposed adjacent to a lower side of the main electrode and applied with the reference potential. The noise electrode is disposed adjacent to a lower side of the guard electrode. The voltage applying portion applies a detection voltage to the main electrode and the noise electrode. The current sensing portion senses a main current of the main electrode, and a noise current of the noise electrode. The capacitance calculating portion calculates a first capacitance based on the detection voltage, the main current, and the noise current.
CAPACITANCE TYPE OCCUPANT SENSOR
2015-08-13
Patent
Electronic Resource
English
IPC: | G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60N SEATS SPECIALLY ADAPTED FOR VEHICLES , Sitze besonders für Fahrzeuge ausgebildet / G01V Geophysik , GEOPHYSICS / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
ELECTROSTATIC CAPACITANCE TYPE OCCUPANT DETECTING SENSOR
European Patent Office | 2015
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