MOTOR VEHICLE SEAT OCCUPANCY SENSOR MAT, CAPACITANCE DETERMINATION SYSTEM, SEAT OCCUPANCY METHOD

The invention relates to an occupancy detection mat for an automobile vehicle seat, comprising a flexible support (4), an interdigitated capacitive sensor (6) carried by the flexible support, a first conductive track (8) carried by the flexible support, the first conductive track (8) having a first end (16) connected to the interdigitated capacitive sensor (6) and a second end (18) intended to be connected to a calculation unit, a second conductive track (10) carried by the support, the second conductive track having a first free end (20) and a second end (22) intended to be connected to said calculation unit. The invention also relates to a system for determining a capacitance, a method for determining a capacitance or an occupancy state of a seat and a method for detecting a rotation of a part of the torso of an occupant seated on a seat.