CAPACITANCE TYPE OCCUPANT SENSOR

摘要

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.

主权项

1. A capacitance type occupant sensor for a vehicle, comprising:
a reference electrode being applied with a reference potential; an electrostatic sensing unit being disposed in a seat of the vehicle, the electrostatic sensing unit including a main electrode, a guard electrode and a noise electrode, the guard electrode being disposed adjacent to a lower side of the main electrode and applied with the reference potential, the noise electrode being disposed adjacent to a lower side of the guard electrode; a voltage applying portion applying a detection voltage to the main electrode and the noise electrode; a current sensing portion sensing a main current flowing in the main electrode and a noise current flowing in the noise electrode; a capacitance calculating portion calculating a first capacitance based on the detection voltage, the main current and the noise current; and a discriminating portion discriminating an occupant based on the first capacitance.