Patent ID: 11866151
Assignee: PRATT & WHITNEY CANADA CORP.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 10:
11. A system for detecting fixed pitch operation of a variable pitch propeller of an engine, the system comprising:
a processing unit; and
a non-transitory computer readable medium having stored thereon program code executable by the processing unit for:
outputting a command signal for maintaining a rotational speed of the propeller at a reference speed;
obtaining an actual value of at least one of the rotational speed and a blade angle of the propeller;
assessing, from the actual value, whether an expected change in the at least one of the rotational speed and the blade angle of the propeller has occurred in response to the command signal;
determining a period of time for which the expected change in the at least one of the rotational speed and the blade angle of the propeller has not occurred;
comparing the period of time to a pre-determined duration; and
responsive to determining that the period of time exceeds the pre-determined duration and determining that the expected change in the at least one of the rotational speed and the blade angle of the propeller has not occurred in response to the command signal, detecting operation of the propeller at fixed pitch and outputting an alert accordingly.