| 摘要 |
<p>A tire pressure control system and method includes a pneumatic control unit, a pressure sensor, a rotary seal associated the tire and a wheel valve rotating with the tire. The system is connected to a compressed air source and the control unit is connected through a connecting line and the rotary seal with the wheel valve. The position of the wheel valve is a function of the pressure in the connecting line. To inflate and vent a tire and to reduce the number of components, the wheel valve has a closed position, an open position wherein a connection is established between the control unit and the tire, and a venting position that opens to the atmosphere. The wheel valve is maintained in its open position as long as an inflation pressure exists in the connecting line. The wheel valve moves into its venting position as long as the pressure in the connecting line that exceeds the inflation pressure by at least a pre-determined value. The wheel valve moves into its closed position when a closing pressure exists in the connecting line which is less than the inflation pressure by at least a pre-determined pressure difference.</p> |
