Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 106 / 182

2301E Digital Control Manual 26641
96 Woodward
Note that in both charts the valve position falls on a curve. The menu does not
permit the construction of a curve. However, with four slope segments (5
breakpoints) available, a rough approximation of the curve can be created (see
Figure 4-8).
Figure 4-8. Linearized Gain Plot
Diesel Engine Setup
Most Diesel engine fuel controls are nearly linear. The dynamics maps may still
be used to accommodate non-linear conditions caused either by the fuel system
or by linkage between the actuator and the rack. For gain settings that are not
used, set the associated breakpoint at 100%.
Control Gain Programming Steps
1. Gain programming is needed whenever the gain of the engine and fuel
system is non-linear. This usually occurs in gas engine applications. A plot of
the fuel system must be determined to properly adjust the gain of the control
to match the gain of the system at all loads.
The plot reflects the actuator output, as seen in A**DISPLAY MENU**,
versus the engine load as load is varied from no load to full load.
To construct a gain plot:
a. Set the Gain A breakpoint for 100%. This ensures that there will not be
any confusion with other settings while plotting the system
characteristics. Only Gain A, Reset, and Actuator Compensation will be
used.
b. Start the engine and obtain good control at no load using Gain A,
Stability, and Actuator Compensation. Record these settings and the
actuator output as displayed in A**DISPLAY MENU**.
0
1
2
3
4
0 20 40 60 80 100 120
P
ID
Ga
in
Fuel Demand
Series1