Method and system for an engine

A method, comprising:

• determining a frequency content of a signal output from a sensor configured to measure a generator output parameter carried on a common bus coupling a first generator and a second generator to one or more motors and/or auxiliary loads, the first generator coupled to a first engine and the second generator coupled to a second engine;
• identifying whether a contribution to the determined frequency content by one or more system components at one or more selected frequencies is greater than a threshold;
• when the contribution is not greater than the threshold, detecting engine imbalance of the first engine and/or second engine based on the one or more selected frequencies of the determined frequency content, and adjusting an engine operating parameter in response to the detected engine imbalance, where the one or more selected frequencies are identified based on a first engine speed of the first engine and a second engine speed of the second engine;
• and
• when the contribution is greater than the threshold, adjusting the detecting of the engine imbalance based on the one or more selected frequencies of the determined frequency content.

A system, comprising:

• a first engine;
• a first generator coupled to the first engine and configured to generate electricity from rotational movement of a first shaft of the first engine;
• a second engine;
• a second generator coupled to the second engine and configured to generate electricity from rotational movement of a second shaft of the second engine;
• a common bus coupled to the first generator and the second generator;
• one or more motors and/or auxiliary loads coupled to the common bus;
• a sensor configured to measure a generator output parameter carried on the common bus;
• and
• a controller configured to:
• determine a frequency content of a signal output from the sensor;
• identify whether a contribution to the determined frequency content by one or more system components at one or more selected frequencies is greater than a threshold;
• when the contribution is not greater than the threshold, detect engine imbalance of the first engine and/or the second engine based on the one or more selected frequencies of the determined frequency content, and adjust an engine operating parameter in response to the detected engine imbalance, where the one or more selected frequencies are identified based on a first engine speed of the first engine and a second engine speed of the second engine;
• and
• when the contribution is greater than the threshold, adjust the detecting of the engine imbalance based on the one or more selected frequencies of the determined frequency content.