MSB-active integrated motor pre-tightening seat belt is a seat belt operating mechanism that acts on the seat belt to improve driving comfort. It uses a high-speed DC motor to actively tighten the seat belt during emergency braking or rapid turning, and restrain the driver on the seat back to prevent serious injury to the driver and passengers. At the same time, when the vehicle encounters dangerous conditions (such as the vehicle in front) Collision warning), the MSB active integrated motor warning seat belt can provide hazard reminder functions. In addition, MSB also has the ability to fasten the buckle to actively reduce the seat belt slack, unlock the buckle to automatically retract the seat belt, and the webbing pull-out force is small, etc. Function. The system consists of two parts: ECU (including motor) and retractor with motor drive.