Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 103 / 182

Manual 26641 2301E Digital Control
Woodward 93
14 GAIN RATIO 1 dflt = 1.00 (1.00
–10.00)
The ratio of the gain setting at steady state to the gain setting during transient
conditions. The gain ratio operates in conjunction with the Window Width and
gain adjustments by multiplying the gain set point by the gain ratio when the
speed error is greater than the window width. This makes the control dynamics
fast enough to minimize engine-speed overshoot on start-up and to reduce the
magnitude of speed error when loads are changing. This allows a lower gain at
steady state for better stability and reduced steady-state actuator linkage
movement (see Figure 4-2).
15 SPEED FILTER FREQ 1 (HZ) dflt = 12.00 (4.00
–20.00)
Adjusts the cutoff frequency of a low pass filter used on the engine speed
sensing input (see Figure 4-4). To use this feature set the cutoff frequency below
15.9 Hz. The filter is used to attenuate engine firing frequencies. To calculate the
desired filter cutoff point, use the following formulas:
camshaft frequency = (engine rpm)/60 [for 2-cycle engines]
= (engine rpm)/120 [for 4-cycle engines]
firing frequency = camshaft frequency x number of cylinders
Initially set the filter frequency to the firing frequency.
As the filter frequency is reduced, steady state stability improves but transient
performance may worsen. As the filter frequency is increased, steady state
stability worsens but transient performance may improve.
If the calculated firing frequency is greater than 15.9 Hz, then disable
the filter by setting the filter cutoff frequency at or above 15.9 Hz.
16 BUMP ACT TRIG (T THEN F) dflt = FALSE (FALSE, TRUE)
This test allows you to test your dynamics settings by temporarily applying a
decreased fuel demand transient to stimulate a control response. Both the
magnitude (Act Bump Level) and duration (Act Bump Duration) of the transient
may be set. The actuator bump must be enabled in the ACTUATOR BUMP
SETUP menu. To initiate an actuator bump, toggle Bump Act to TRUE then back
to FALSE while the engine is operating in a normal steady state loaded or
unloaded condition.
17 PID DYNAMICS IN USE (monitor)
This value will indicate which set of dynamics are in use by the controller. The
choices that are shown here are:

PID USING DYNAMICS 1

PID USING DYNAMICS 2

PID USING 5-SLOPE - DYNAMICS 1

PID USING 5-SLOPE - DYNAMICS 2