SMART KEY SYSTEM FOR VEHICLE HAVING TOUCH SENSOR

摘要

A smart key system for a vehicle having a touch sensor is provided to generate a door opening signal to a smart key system controller by determining contact of a human body with a controller of the touch sensor as the door opening signal when a user having a smart key is contacted with a door handle. A smart key system for a vehicle having a touch sensor includes a door control device, a touch sensor control unit(500) and a detection unit(400). The door control device opens or closes a door for the vehicle. The touch sensor control unit(500) outputs a closing/opening control signal of the door to the door control device. The detection unit(400) detects change of capacitance caused by contact of a human body, and outputs a detection signal to the touch sensor control unit(500). In the touch sensor control unit(500), a charge condenser(501) discharges the capacitance charged through the detection unit(400) and a discharging condenser(502). A multiplexer(503) controls discharge of the charging condenser(501). The discharging condenser(502) discharges the charging condenser(501) through the multiplexer(503) in an idle state. A comparator(504) outputs an effective pulse by comparing a voltage, which is changed according to the discharge of the charging condenser(501), with a reference voltage. A controller(505) controls the discharge of the charging condenser(501) through the multiplexer(503), and receives the effective pulse inputted from the comparator(504).