Patent ID: 7289899

Claim:
An internal combustion engine system comprising: a turbocharger for turbocharging the engine; a processor for executing data processing algorithms; a data source providing a data value for actual boost; a boost map containing data values for boost each of which is developed during steady state engine operation at a respective speed with the engine developing a respective torque and each of which is arranged in the map in correlation with a respective set of data values for engine speed and torque; and a torque map containing data values for calculated torque, each correlated with a respective set of data values for boost disparity and torque; wherein the processor comprises a torque calculation algorithm that when executed as the engine accelerates under load, is arranged to a) calculate a data value for boost disparity by processing the data value for actual boost and a data value for boost selected from the boost map using a data value for actual engine speed and a data value for estimated torque that possesses some inaccuracy due to some disparity between the data value for actual boost and the data value for boost selected from the boost map, and b) select from the torque map a data value for calculated torque correlated with the data value for boost disparity and the data value for estimated torque.