
Integral Control
Consider integral control as a constant summation function. That
is, it is constantly adding up the error from the target speed and
providing feedback proportional to the total rather than the error. So in
our example, the constant error of even a fraction of a mph will
accumulate until at some point the total will be enough to cause effective
corrective action. Once again I have to emphasize that integral control on
its own will not be enough to control speed within the example already
described. Proportional and derivative are still essential ingredients in
the mix.


