Patent ID: 7861580
Filing Date: 2011-01-04
Classification: F01D,F02B,F05D,Y02T

Abstract:
1. A virtual turbine speed sensor for a multi-stage turbocharger system of an internal combustion engine, the multi-stage turbocharger system comprising at least two sequential turbochargers each having a compressor and a turbine, the virtual speed sensor comprising: a compressor efficiency module configured to estimate an efficiency of a compressor of a first of the at least two turbochargers; an inter-stage air temperature module configured to estimate an inter-stage temperature of air between the at least two compressors, the inter-stage temperature estimate being based at least partially on the efficiency of the compressor of the first turbocharger; and a turbine speed module configured to estimate a speed of a turbine of a second of the at least two turbochargers, the speed estimate of the turbine of the second turbocharger being based at least partially on the temperature estimate of air between the at least two compressors.