Patent ID: 7219002
Filing Date: 2007-05-15
Classification: F02D,F02M,Y02T

Abstract:
1. A control apparatus for an internal combustion engine, comprising: an estimation unit estimating, based on engine parameters, an intake-air-pressure index value and an engine control variable under the condition that the internal combustion engine is in a steady operating state and the condition that an exhaust-driven turbocharger has its supercharging efficiency equal to a first predetermined ratio and estimating, based on the engine parameters, an intake-air-pressure index value and an engine control variable under the condition that said internal combustion engine is in the steady operating state and the condition that said exhaust-driven turbocharger has its supercharging efficiency equal to a second predetermined ratio; a detection unit detecting an actual intake-air-pressure index value; and a calculation unit calculating an engine control variable associated with said actual intake-air-pressure index value under the condition that said internal combustion engine is in a transient operating state, by performing interpolation on said engine control variables, based on a relation between said intake-air-pressure index values each as estimated and said actual intake-air-pressure index value as detected.