US Patent 7717494 Vehicle body underside air flow controller

There is provided a vehicle-body underside airflow controller capable of obtaining an optimum aerodynamic performance by detecting vehicle speed and by controlling a rise angle of an under-cover (10) corresponding to the vehicle speed by driving actuators (14) so that a road clearance of the under-cover (10) becomes H2 and the rise angle thereof becomes α2 when the vehicle speed is equal to or higher than a predetermined vehicle speed (when high speed) and by driving the actuators (14) so that the road clearance of the under-cover (10) becomes H1 and the rise angle thereof becomes α1 when the vehicle speed is lower than the predetermined vehicle speed (when low speed).