Patent ID: 7415825

Claim:
A method for controlling a variable geometry turbocharger in an internal combustion engine, comprising the steps of: when the engine is operating in a first mode: sensing at least one engine parameter; inputting the at least one engine parameter to a controller; determining a control setpoint based on a desired value of the at least one engine parameter; measuring a value; determining a difference between the control setpoint and the measured value; calculating a duty cycle based upon the difference; and actuating turbocharger vanes based upon the duty cycle; when the engine is operating in a second mode: actuating the turbocharger vanes thereby causing them to assume, for a predetermined time, a substantially open position that is not based on said desired value; wherein the engine operates in the second mode immediately following an engine startup event, and wherein the engine operates in the first mode when the predetermined time of the second mode has expired.