Engine oil system for an aircraft propulsion system and method for controlling same

A method for controlling a bypass valve of an engine oil system for an engine of an aircraft propulsion system, the method comprising:

• measuring a temperature (TOIL) of oil within an oil flow path of the engine oil system and measuring a differential pressure (ΔPOIL) of the oil across a filter of the engine oil system during operation of the engine and the engine oil system with a sensor assembly;
• controlling positioning of the bypass valve to an open position or to a closed position, with an unfaulted control routine executed at a controller, using the temperature (TOIL) and the differential pressure (ΔPOIL), in the open position the bypass valve directing at least a portion of the oil through the bypass valve bypassing the filter, in the closed position the bypass valve directing substantially all of the oil along the oil flow path through the filter;
• executing, at the controller, a model trained to identify correlation or non-correlation between the temperature (TOIL) and the differential pressure (ΔPOIL) for the position of the bypass valve;
• and
• identifying a faulted condition or an unfaulted condition of the sensor assembly, at the controller using the model, the faulted condition identified where the temperature (TOIL) or the differential pressure (ΔPOIL) is outside of an expected temperature range or an expected differential pressure range, respectively, determined by the model for the position of the bypass valve.

An engine for an aircraft propulsion system, the engine comprising:

• an engine oil system including an oil flow path, a filter assembly, and a sensor assembly, the engine oil system configured to direct oil along the oil flow path through one or more engine oil loads of the engine,
• the filter assembly including an oil inlet, an oil outlet, a filter, and a bypass valve, the filter assembly forming a portion of the oil flow path from the oil inlet to the oil outlet, each of the filter and the bypass valve connected in fluid communication with and between the oil inlet and the oil outlet, the bypass valve positionable in an open position and a closed position, and
• a sensor assembly configured to measure a temperature (TOIL) of the oil in the oil flow path and a differential pressure (ΔPOIL) of the oil across the filter;
• and
• a controller connected in signal communication with the sensor assembly and the bypass valve, the controller including a processor connected in signal communication with a non-transitory memory including instructions which, when executed by the processor, cause the processor to:
• control positioning of the bypass valve to the open position or to the closed position with an unfaulted control routine using the temperature (TOIL) and the differential pressure (ΔPOIL);
• execute a model trained to identify correlation or non-correlation between the temperature (TOIL) and the differential pressure (ΔPOIL) for a position of the bypass valve;
• and
• identify a faulted condition or an unfaulted condition of the sensor assembly using the model, the faulted condition identified where the temperature (TOIL) or the differential pressure (ΔPOIL) is outside of an expected temperature range or an expected differential pressure range, respectively, determined by the model for the position of the bypass valve.