정전용량 센서의 수분 영향성 회피 방법 연구

Recently, many automotive parts are replaced with electronic devices. Because of functional requirements for customer convenience, a number of sensor application part is increasing. On the other hand, capacitive sensor technology has made great progress with the development of touch screen of smart phone. And now, many electronic devices begin to use capacitive sensor instead of mechanical switch. Due to capacitive sensor is good durability and it is possible to miniaturize and it can measure proximity and detect human touch, there are various attempts and studies to use capacitive sensor in the automotive part area. Since, the most common cause of sensor incorrect operation is water, this is difficult factor to apply the sensor to automobile exterior parts. In this paper, we propose a integrated capacitive sensing method that uses both self capacitance and mutual capacitance and by using signal pattern obtained by the sensor it shows the possibility to avoid incorrect operation caused by water.