A two-wire capacitive door handle switch detection system disclosed by the present invention comprises a capacitive switch and a keyless entry system, the capacitive switch comprises an LDO, an MCU, a capacitive sensor and an output triode, the capacitive sensor comprises two different touch areas for detecting unlocking and locking, the capacitive sensor is connected with the MCU, and the output triode is connected with the MCU. A square wave signal output end of the MCU is connected with a base electrode of the output triode, an emitter electrode of the output triode is grounded, a collector electrode of the output triode is connected to a hardware detection circuit of the keyless entry system through the resistor R2 and the switching diode, and the LDO supplies power to the MCU. According to the capacitive door handle switch, whether the key is triggered or not is judged by detecting the change of the capacitance, and pressing of a physical stroke is not needed; meanwhile, the capacitive switch can be provided with an induction area on the inner side of the door handle and used for detecting the operation that the user stretches out the door and unlocking the vehicle, and the use experience is further improved.
本发明揭示了一种两线制电容式门把手开关检测系统,包括电容式开关和无钥匙进入系统,所述电容式开关包括LDO、MCU、电容式传感器、输出三极管,所述电容式传感器包括用于检测解锁和闭锁的两个不同触摸区域,所述电容式传感器与MCU连接,所述MCU的方波信号输出端连接输出三极管的基极,输出三极管的射极接地,集电极经电阻R2、开关二极管连接至无钥匙进入系统的硬件检测电路,所述LDO为MCU供电。本发明电容式门把手开关采用的是检测电容量的变化来判断是否触发按键,无需物理行程的按压;改善了用户体验,同时电容式开关可在门把手内侧布置感应区域,用于检测用户伸手拉门的操作,执行解锁车辆,进一步提高了使用体验。
Two-wire system capacitive door handle switch detection system
一种两线制电容式门把手开关检测系统
2023-08-04
Patent
Electronic Resource
Chinese