Graphics Reference
In-Depth Information
Control Output
simin
Fuzzy Logic
Controller
To Workspace1
+
+
arx222
410
+
-
y
Add
Reference
Idmodel
−1.7e4
Subtract
simout
Trim point
4.4e4 gives 380fps
− scaled value is −1.7e4
Error
To
Workspace
FIGURE 6.7
Fuzzy logic control system.
6.5
RESULTS
6.5.1 s
imulation
Figures 6.8 and 6.9 show results from both parts of the experiment using a fuzzy
controller to track frame rate level changes. In both scenarios, the controller was
capable of varying the input to the plant so that its output followed the reference level
closely. However, the fuzzy controller took longer to perform this task as indicated
by the output response times in both parts of this experiment.
6.5.2 f
uzzy
c
ontRol
s
ystem
with
R
endeRing
P
Rocess
In the second experiment, the rendering process was allowed to stabilise at 400 FPS
before the new reference level of 370 FPS was set as shown in Figure 6.10. The fuzzy
Simulated Input and Output of Rendering Process
400
Output
390
380
370
360
350
4
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
5.8
6
×10
4
Frame
×10
4
−1.55
Input
−1.6
−1.65
−1.7
−1.75
−1.8
4
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
5.8
6
×10
4
Frame
FIGURE 6.8
Reference tracking using fuzzy controller (high to low).
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