A vehicle seat device capable of suitably restraining an occupant by means of a seat belt device includes a seat main body having a seat cushion and a seat back, a reclining device connecting the seat back to the seat cushion so as to be pivotable and capable of locking a pivoting motion of the seat back, and a seat belt device for restraining an occupant seated on the seat main body. The seat belt device includes a lap belt restraining the occupant's lumbar or thighs, a belt anchor attached at a position beside the seat main body and having a belt engaging portion engaging with an engaged portion provided in a tip portion of the lap belt, and an anchor moving device capable of moving the belt engaging portion of the belt anchor in a seat front to back direction with respect to the seat main body.

A system is described herein. The system comprises sensor modules; a memory; and a processor storing instructions in the memory that, when executed, causes the processor to: receive data comprising vehicle compartment features, occupant features and external environmental conditions from the sensor modules; determine a current setup of a seat belt and a current posture of an occupant based on the vehicle compartment features and the occupant features, respectively; determine critical features of the occupant based on at least one of the current posture of the occupant, the current setup of the seat belt and the external environment conditions; determine a deviation from the current setup of the seat belt based on at least one of the critical features of the occupant and the external environmental conditions; and communicate a command to actuators for changing a current height of the seat belt to an optimal height according to the deviation.

A seat belt positioning system and method built inside of a seat having a track configured to extend a seat belt horizontally and vertically; an extender arm coupled to the track; a shoulder adjustment trolley configured to move the seat belt in a lateral direction; and a control system operably connected to the track and the shoulder adjustment trolley.

A system is described herein. The system comprises sensor modules; a memory; and a processor storing instructions in the memory that, when executed, causes the processor to: receive data comprising vehicle compartment features, occupant features and external environmental conditions from the sensor modules; determine a current setup of a seat belt and a current posture of an occupant based on the vehicle compartment features and the occupant features, respectively; determine critical features of the occupant based on at least one of the current posture of the occupant, the current setup of the seat belt and the external environment conditions; determine a deviation from the current setup of the seat belt based on at least one of the critical features of the occupant and the external environmental conditions; and communicate a command to actuators for changing a current height of the seat belt to an optimal height according to the deviation.