Control method for preventing differences between rotor tilt angles in a fly-by-wire tiltrotor aircraft

A method for preventing a maximum asymmetric condition between a first rotor system mounted to a wing member and pivotable through a range of pylon angles and a second rotor system mounted to the wing member and pivotable through the range of pylon angles in a tiltrotor aircraft, comprising:

• transmitting, to a set of actuators connected to the first rotor system and the second rotor system, a pylon command to pivot the first rotor system and the second rotor system, the pylon command separately specifying, at least in part, desired movement of each of the first rotor system and second rotor system;
• detecting an asymmetric condition between the first rotor system and the second rotor system in response to a first pylon asymmetry exceeding a first asymmetry threshold, the first pylon asymmetry comprising a difference between a first pylon angle of the first rotor system and a second pylon angle of the second rotor system;
• and
• adjusting the pylon command to a current pylon command in response to the asymmetric condition.

A method, comprising:

• transitioning a fly-by-wire tiltrotor aircraft between an airplane mode and a helicopter mode, the tiltrotor aircraft comprising a first rotor system and a second rotor system;
• transmitting an original pylon command to move the first rotor system and the second rotor system, the original pylon command separately specifying, at least in part, desired movement of each of the first rotor system and the second rotor system;
• determining a difference between a first pylon angle associated with the first rotor system and a second pylon angle associated with the second rotor system;
• comparing the difference to an asymmetry threshold;
• detecting an asymmetric condition between the first rotor system and the second rotor system if the difference exceeds the asymmetry threshold;
• and
• adjusting the original pylon command to a current pylon command in response to the asymmetric condition.