Method and valve assembly for controlling a pilot signal
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United States of America Patent
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-
Jun 18, 1996
Grant Date -
N/A
app pub date -
Jan 12, 1995
filing date -
Jan 12, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pilot signal control assembly (10) controls the pilot signal of a valve (18) which is connected to regulator, typically a booster regulator (12). The valve (18) receives air from an air supply (14) and, pursuant to an error signal (E(t)) , defined as the command signal (C(t)) less a modified feedback signal (F(t)) , modifies its output, the pilot pressure signal. The booster regulator (12) receives the pilot pressure signal and modifies its output (P.sub.o (t)) accordingly. A feedback loop (24) transforms the output pressure (P.sub.o (t)) into a voltage signal. The voltage signal is multiplied by a proportional factor (A) based on the size of the booster regulator (12). In a signal subloop (30) of the feedback loop (24), the first derivative is taken of the voltage signal. The multiplied signal and the first derivative are added to create the feedback signal (F(t)) which is eventually subtracted from the command signal (C(t)) to create the error signal (E(t)). The first derivative portion of the feedback signal (F(t)) rapidly approaches zero as the output pressure (P.sub. o (t)) of the booster regulator (12) gradually approaches the targeted pressure.
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