A steering-wheel grip sensor includes: a driven electrode having a planar shape and extending along a rim of a steering wheel; a sensor electrode having a planar shape and opposed to the driven electrode; a sine-wave generator that supplies a sinusoidal voltage to the driven electrode; a charge amplifier that includes a feedback capacitive element, detects a change in an amount of charge generated according to capacitance of the sensor electrode, and outputs the change in the amount of charge as a change in a voltage; a multiplication processor that multiplies the sinusoidal voltage by an output voltage from the charge amplifier; an integrator that smooths, by integration, a result of multiplication by the multiplication processor; and a grip determiner that determines whether the steering wheel is gripped, according to a level of the result smoothed.
STEERING-WHEEL GRIP SENSOR AND GRIP DETECTION METHOD
2021-12-02
Patent
Electronic Resource
English