Page 74 - Understanding Automotive Electronics
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THE SYSTEMS APPROACH TO CONTROL AND INSTRUMENTATION 2
The dotted curve in Figure 2.24 shows the response of a proportional
control system to a disturbance d at time t = 1 sec. Instead of remaining at the
set point x following disturbance d, the system response changes to a steady
o
error e, which is given by
d
e = ----
G
In principle, the error for any given disturbance can be made as small as
desired by raising the feedback gain. Unfortunately, the control system
Figure 2.24
Response of a Proportional Control System to a Disturbance
UNDERSTANDING AUTOMOTIVE ELECTRONICS 61
