System and method for controlling minimum flow rate of variable geometry turbocharger
First Claim
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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Accused Products
Abstract
The present invention relates to a system and method for controlling a minimum flow rate of a variable geometry turbocharger that improve the starting performance of a vehicle and prevent the generation of surge noise and smoke remarkably, comprising a stopper to restrict the lever rotation of a flow regulator and determine a minimum flow rate of the turbocharger based on the position that restricts the lever rotation, in a structure where its position can be regulated to control the lever rotation limit position and the minimum flow rate of the turbocharger, and an ECU to calculate a stopper position correction value, with which an actual boost pressure detected by a boost pressure detection unit satisfies a target boost pressure, if meeting predetermined vehicle speed and gear ratio conditions, and then to duty-control a stopper position regulator to correct the current stopper position by the calculated stopper position correction value.
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Citations
10 Claims
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1. A method for controlling a minimum flow rate of a variable geometry turbocharger comprising the steps of:
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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. - View Dependent Claims (2, 3)
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4. A system for controlling a minimum flow rate of a variable geometry turbocharger comprising:
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a stopper established in a structure where its position is adjusted to restrict a lever rotation of a flow regulator so as to determine a minimum flow rate of a turbocharger according to a position that restricts the lever rotation, and to restrict the lever rotation and the minimum flow rate of the turbocharger; a vehicle speed detection unit detecting a driving speed of a vehicle; a gear ratio detection unit detecting a gear ratio of the vehicle; a boost pressure detection unit detecting a boost pressure; an ECU calculating a stopper position correction value based on signals input from the vehicle speed detection unit, the gear ratio detection unit and the boost pressure detection unit and pre-stored data, and outputting a control signal for correcting the current stopper position by the calculated stopper position correction value, thus controlling the minimum flow rate of the turbocharger; and a stopper position regulator regulating the position of the stopper according to the control signal of the ECU. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification