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Apparatus for controlling variable nozzle of turbocharger

  • US 6,990,813 B2
  • Filed: 06/25/2004
  • Issued: 01/31/2006
  • Est. Priority Date: 06/26/2003
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling a variable nozzle of a turbocharger, which has an electronic control actuator for controlling an opening of a vane of said variable nozzle of said turbocharger according to an indication signal from an engine electronic control unit for controlling an engine provided with said turbocharger having said variable nozzle,wherein said electronic control actuator has an output shaft enabled to rotate within a range of an angle θ

  • a; and

    wherein said variable nozzle is enabled to move within a range of an angle θ

    b (θ

    b<

    θ

    a) between a first stopper and a second stopper,said apparatus comprising;

    an angle sensor for detecting an angle, by which said variable nozzle moves within a range of said angle θ

    b between said first stopper and said second stopper, in terms of a movement angle of said output shaft and for generating an angle signal; and

    an electric control circuit, to which the angle signal generated by said angle sensor is supplied, for storing angle signals, respectively, generated by said angle sensor in a position, in which said variable nozzle collides with said first stopper, and a position, in which said variable nozzle collides with said second stopper, as a first collision position signal and a second collision position signal, for storing angle signals, which respectively differ from the first collision position signal and the second collision position signal by a predetermined first offset angle θ

    α and

    a predetermined second offset angle θ

    β

    , as a first limit position signal and a second limit position signal, and for generating a control signal, according to which said output shaft of said electronic control actuator is driven within a range of an angle θ

    c (θ

    c<

    θ

    b) between a first limit position and a second limit position, which are respectively represented by the first limit position signal and the second limit position signal.

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