Patent ID: 7047125

Claim:
An engine, the engine being a first engine, comprising: a rotatable crankshaft; and a control system operable to estimate an operational parameter of the first engine, the control system including: a model for estimating the operational parameter of the first engine as a function of instantaneous crankshaft speed at a plurality of angular positions of the crankshaft of the first engine, the model developed, at least partially, based upon operational data from a second engine having a rotatable crankshaft; a sensor operable to determine values representative of the instantaneous crankshaft speed of the first engine, at a plurality of angular positions of the crankshaft of the first engine; and a modifier operable to modify at least some of the representative values to, at least partially, calibrate out differences between the first and second engines that may cause variations in instantaneous crankshaft speed, the modified values being input to the model.