Automatic back door control system for automobile

The utility model relates to an automatic back door control system for an automobile. The system comprises a back door control unit, a back door driving unit, a back door lock body unit, a back door control switch and a power supply, wherein the power supply is used for supplying power to the back door control unit; the back door control unit comprises an MCU (micro controller unit) module, a switch detection circuit and a motor control circuit; the MCU module communicates with an automobile body controller through an LIN (local interconnect network) bus or a CAN (controller area network) bus, and is used for acquiring the automobile state information of the automobile body controller; the switch detection circuit is used for detecting a switch state signal of the back door control switch, and transmitting the detected switch state signal to the MCU module; the MCU module is used for performing logical judgment on the received automobile state information and the received switch state signal, and outputting a pulse width modulation signal to the motor control circuit to control the locking or unlocking of the back door lock body unit and control the back door driving unit to open or close a back door in a dragging way respectively. The system aims to improve the reliability and the safety of automatic control over the back door of the automobile.