| 摘要 |
<p>A port control member (24) of a metering valve (10) is mechanically connected to a pilot operated foot pedal (38). Foot pedal (38) movement of this member (24) meters fluid pressure to a second electrically metering valve (108, 110, 112). Pressure from the second metering valve (108, 110, 112) is delivered to one end of a port control member (126) of a third metering valve (126, 136,138, 140). The third metering valve (126, 136, 138, 140) meters pressure and flow from a supply pressure to wheel brakes (50). Feedback pressure from the brakes (142) is applied to the port control member (126) in opposition to the command pressure (124). The command pressure (108, 110, 112) is fed back to act on the port control member (24) of the first stage valve (10) in opposite relation to the pilot developed pedal force.</p> |
