Automobile brake boosting device based on direct-current motor

The invention relates to an automobile brake boosting device based on a direct-current motor, which is characterized by comprising a direct-current motor braking booster and a direct-current motor controller. A stator and a bearing of the direct-current motor are fixed with a shell which is fixed on a partition board between a cab and an engine, oblique teeth are arranged on the inner wall of a rotor, a boosting push rod meshed with the oblique teeth is arranged in the rotor, one end of the boosting push rod penetrates through the partition board to contact with a piston push rod of an automotive brake master cylinder, the other end of the boosting push rod is connected with a brake pedal, and a pressure sensor is arranged at the bottom of the brake pedal and is connected with a vehicular CAN (control area network) bus. The direct-current motor controller comprises a single chip microcomputer, a CAN bus transceiving peripheral circuit and a motor PWM (pulse width modulation) driving peripheral circuit, wherein the CAN bus transceiving peripheral circuit is used for receiving pressure values from the vehicular CAN bus and transmitting the acquired values to the single chip microcomputer, the single chip microcomputer is used for generating PWM signals of a TTL (transistor-transistor logic) type and transmitting the signals to the motor PWM driving peripheral circuit, and the motor PWM driving peripheral circuit is used for converting the signals into PWM signals of an MOS (metal oxide semiconductor) type and transmitting to the direct-current motor so as to control operation of the direct-current motor. The automobile brake boosting device can be widely applied to braking systems of various automobiles.