Patent Document ID: 4732003
Application ID: 06807225
Patent Flag: 1

Claim One:
1. An apparatus, comprising: an exhaust turbine having an inlet for receiving exhaust gas from an operating system, said inlet having a cross sectional area, a compressor powered by said exhaust turbine for supplying a supercharging pressure to said operating system, a variable geometry means for adjusting the cross sectional area of said inlet to said exhaust turbine, an exhaust bypass valve means for providing an exhaust path bypassing said exhaust turbine, an operation detecting means which detects operating conditions of said operating system, a supercharging pressure detecting means which detects said supercharging pressure, a deviation calculating means which calculates a deviation between the detected supercharging pressure and a target supercharging pressure and provides an integrated value of said deviation, a controlled variable determination means which determines a controlled variable for actuating at least one of said variable geometry means and said exhaust bypass valve means based on said operating conditions, a feedback correction means which operates to perform feedback correction of said controlled variable in accordance with a previously determined learning amount and said integrated value of said deviation to produce a corrected controlled variable, a control means which controls at least one of said variable geometry means and said exhaust bypass valve means in accordance with said corrected controlled variable, an operating range discriminating means which determines an operating range in which feedback control of said at least one of said variable geometry means and said exhaust bypass valve means is to be performed, and a learning amount calculating means which calculates a new learning amount in relation to at least one of said variable geometry means and said exhaust bypass valve means in accordance with the result of the operating range determining made by said operating range discrimination means and said integrated value of said deviation, so that the controlled variable is corrected in future operations of said feedback correction means based on said new learning amount used as said previously determined learning amount.