System and method for estimating turbocharger operating speed

摘要

A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.

主权项

1. A method of estimating an operating speed of a turbocharger including a compressor having an air inlet and an air outlet, the method comprising:
determining a first pressure value corresponding to pressure entering the air inlet of the compressor; determining a second pressure value corresponding to pressure exiting the air outlet of the compressor; determining a flow value corresponding to a flow rate of air entering the air inlet of the compressor, and processing the flow value using a compressor pressure ratio map to generate at least one pair of turbocharger operating speed and compressor pressure ratio values; determining a current compressor pressure ratio value in response to the first and second pressure signals; estimating the operating speed of the turbocharger using the current compressor pressure ratio value and the at least one pair of the turbocharger operating speed and compressor pressure ratio values.