Seat assembly for a vehicle

A seat assembly for a vehicle includes a seat frame and a plurality of support units disposed on the seat frame. Each of the plurality of support units has a support tray, a cylinder connected to the support tray, a pressure sensor, an intake valve, and an exhaust valve. A gas supply to the cylinder is controllable via the inlet valve, a gas discharge from the cylinder is controllable via the exhaust valve, and an occupant of the vehicle is supportable by the support tray and a support force and a support height of the support tray is adjustable. A controller is configured to receive a pressure signal detected by the pressure sensor of each of the plurality of support units to control an open state or a closed state of the intake valve and the exhaust valve of each of the plurality of support units separately.