Method for obtaining and processing pitch feedback signals

The invention relates to a method for obtaining and processing pitch feedback signals. Pitch voltage signals collected by a potentiometer are set to be current signals of 4-20 mA through a signal conversion board to serve as preliminary pitch feedback current signals; and the preliminary pitch feedback current signals are transmitted to a controllable-pitch propeller control box through a watertight shield cable, pass through an isolation module and then are transmitted into a PLC, a touch screen communicates with the PLC mutually, and the PLC converts the preliminary pitch feedback current signals into pitch feedback current signals in one-to-one correspondence with mechanical pitch positions through pitch structure information stored in the touch screen for pitch control. Transmission from a pitch indicator to the controllable-pitch propeller control box is changed into current transmission, and thus the anti-interference ability is strong. When located at the ahead/reverse stop positions, the pitch is link