That would be the responsibility of the autopilot designer. If he/she designed a control structure that used two separate controllers that acted on the ailerons, that would be his/her problem. In fact it might turn out to be a good thing. ;-)
Does this imply that we also need a "summer" class/unit/module which can take the outputs from various controllers and sum them to feed to the "actuator"?
Yes, a "summer" class/unit/module would be a handy tool. A "gain" class/unit/module would also be usefull.
-- Roy Vegard Ovesen
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