CONTROLLER

PURPOSE:To provide the controller which controls an actuator, which has ON/ OFF type output, by fuzzy control. CONSTITUTION:Data showing the current state of a controlled system are sent to an inference part 3 through an input part 2. The inference part consists of a fuzzy inference device which performs arithmetic processing by a max-min composite gravity center method and finds the gravity center value (m) of an inference result. This gravity center value (m) is sent to an output processing part 4, which is calculates an ON time tr from tr=T*m/L. Here, T is a control period and L is the range of a trapezoid set. Then the ON time Tr is sent to the output part 5 of a next stage and set in the timer in the output part 5, and an ON signal is outputted to an actuator which is not shown in the figure for the time.