Compressor pressure ratio control

A method for generating power by an engine, the method comprising:

• providing engine components of the engine;
• determining operating conditions of the engine;
• computing, by a control module, a first power value (PC) to be generated by a compressor based on an estimation model of the compressor;
• sensing, by a pressure sensor, pressure values across the compressor;
• computing, by a power term estimator module, a second power value (PU) based on an estimated power compressor pressure ratio (βcest) based on an actual compressor pressure ratio (βcmeas) of the compressor, the measured compressor pressure ratio (βcmeas) based at least in part on the pressure values across the compressor;
• computing, by the control module, an amount of power to be generated by the engine (Ptdes) by adding the first power value and the second power value;
• and
• adjusting, by the control module, a piston position to generate the amount of power to be generated.

An engine system comprising:

• an engine;
• and
• a turbocharger comprising a compressor;
• a control module;
• and
• a power term estimator module;
• wherein:
• a pressure sensor configured to senses a pressure of air from the compressor;
• the control module dynamically computes a first power value (PC) to be generated by the compressor based on an estimation model of the compressor;
• the power term estimator module dynamically computes a second power value (PU) based on an actual compressor pressure ratio (βcest) of the compressor, the measured compressor pressure ratio (βcmeas) based at least in part on the pressure sensed by the pressure sensor;
• the control module computes an amount of power to be generated by the engine system (Ptdes) by adding the first power value and the second power value;
• and
• the control module adjusts a piston position to generate the amount of power to be generated.