  The concept of controlling non-linear systems is one the significant fields
in scientific researches for the purpose of which intelligent approaches can
provide desirable applicability. Fuzzy systems are systems with ambiguous
definition and fuzzy control is an especial type of non-linear control. Inverse
pendulum system is one the most widely popular non-linear systems which is
known for its specific characteristics such as being intrinsically non-linear
and unsteady. Therefore, a controller is required for maintaining stability of
the system Present study tries to compare the obtained results from designing
fuzzy intelligent controllers in similar conditions and also identify the
appropriate controller for holding the inverse pendulum in vertical position on
the cart.
