Patent ID: 7694553

Claim:
A method for calibrating a variable nozzle of a turbocharger, the turbocharger having a compressor and a turbine connected by a shaft, a position of the variable nozzle being adjustable by an actuation mechanism connected to the variable nozzle, the position being adjustable between a minimum flow position and a maximum flow position, the method comprising the steps of: supplying fluid through the variable nozzle to an inlet of the turbine, and adjusting a flow rate of the fluid until turbine inlet temperature and turbine inlet pressure are within predetermined ranges; progressively changing the position of the variable nozzle while monitoring an outlet pressure of the compressor; determining that the minimum flow position of the variable nozzle has been reached when the outlet pressure of the compressor reaches a predetermined pressure; and fixing a mechanical stop for the actuation mechanism while the variable nozzle is in the minimum flow position.