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System and method for controlling minimum flow rate of variable geometry turbocharger

  • US 7,805,938 B2
  • Filed: 10/26/2007
  • Issued: 10/05/2010
  • Est. Priority Date: 11/01/2006
  • Status: Active Grant
First Claim
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1. A method for controlling a minimum flow rate of a variable geometry turbocharger comprising the steps of:

  • determining, at an ECU, whether a vehicle speed and a gear ratio detected by a vehicle speed detection unit and a gear ratio detection unit correspond to a minimum flow learning region satisfying predetermined conditions;

    calculating, at the ECU, a difference between a predetermined target boost pressure corresponding to the vehicle speed and gear ratio conditions and an actual boost pressure detected by the boost pressure detection unit, and then calculating a stopper position correction value for regulating the current stopper position to be a stopper position where the actual boost pressure meets the target boost pressure, if the ECU determines that the vehicle speed and the gear ratio correspond to the minimum flow learning region;

    outputting, at the ECU, a control signal for correcting the current stopper position based on the calculated stopper position correction value; and

    regulating, at the ECU, the stopper position by the stopper position correction value to control the minimum flow rate of the turbocharger as a stopper position regulator is operated and controlled by the control signal output from the ECU.

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