| 摘要 |
<p>The invention provides a system and method for making the braking action more sensitive to pilot control, to provide a smooth stopping response to foot pedal movement by the pilot. A port control member (48) of a first stage metering valve (44) is mechanically connected to a pilot operated foot pedal (50). A pilot applied force on the foot pedal (50) moves the member (48) in a direction causing flow through the valve (44) from a supply pressure to a control pressure chamber in a second stage metering valve (46) to produce a force on a second port control member (76), for moving it in response to foot pedal (50) movement, to meter flow and pressure through the second stage metering valve (46), from a supply pressure to the brake applying device of an aircraft wheel. The output pressure of the first stage metering valve is used as a feedback pressure to move the first stage port control member (48) into a null position in opposition to the foot pedal force. Very little fluid flow through first stage valve (44) is required in order to develop the feedback force. The response to pilot movement of the foot pedal (50) is therefore almost instantaneous.</p> |
