Method and device for synchrophasing the propellers of an aircraft with several propulsion units

Abstract

For constant-speed synchrophasing of the propellers () of the propulsion units () of an aircraft each equipped with an electronic control circuit () connected to a communications network () of the aircraft, each control circuit of a propulsion unit includes a clock delivering a clock signal at a frequency representing a rotational speed of the propulsion unit propeller corresponding to said constant speed, the control circuit clocks are kept substantially synchronous by communication via the communications network of the aircraft, and in each propulsion unit, the offset between the clock signal and a signal produced from a propeller rotational speed sensor is measured and compared to a determined propeller phase value assigned to the propulsion unit and, depending on the result of the comparison, an instantaneous variation of the propeller rotational speed is applied as necessary so as to bring the measured offset to the determined value.