Turbocharger control device for vehicle and method of estimating base boost pressure by using the same
AssigneesHyundai Motor Company, Kia Corporation
InventorsDaewoong Hwang, Dong Hee Han, Minkyu Han
Life of this patent
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Abstract
Disclosed is a turbocharger control device of a vehicle and a method of estimating base boost pressure using the same. The turbocharger control device of a vehicle includes a status information collection unit for collecting real-time status information according to an operation of a turbocharger when a vehicle is operated from various types of sensors, and a control unit for precisely estimating a base boost pressure by excluding a turbocharger boost pressure from a current boost pressure through a turbine power function and a compressor power function based on a physical model based on the collected status information.
Claims8
A turbocharger control device of a vehicle, the turbocharger control device comprising:
- a status information collection unit for collecting status information according to an operation of a turbocharger when a vehicle is operated;
- and
- a control unit for estimating a base boost pressure by excluding a turbocharger boost pressure from a current boost pressure through a turbine power function and a compressor power function based on the status information,
- wherein the control unit determines an overboost phenomenon in which the base boost pressure exceeds a target boost pressure under a specific situation during an operation of the vehicle, and
- wherein the control unit performs an overboost preventing control to reduce the base boost pressure by controlling an amount of opening of a throttle valve of an engine when the overboost occurs and places the turbocharger in a controllable region.
A method of estimating a base boost pressure, the method comprising:
- collecting status information when a vehicle enters a turbo control-on status during an operation;
- estimating a turbine power minimum value by using a turbine power function reflecting a flow rate of exhaust gas passing through a turbine, a temperature of the exhaust gas upstream of the turbine, and a temperature of the exhaust gas downstream of the turbine of the status information;
- estimating compressor efficiency by constructing an efficiency estimation function for a flow rate of intake air passing through a compressor, a rotational speed of the compressor, a temperature of intake air upstream of the compressor, and a pressure of intake air upstream of the compressor of the status information;
- estimating a compressor power minimum value by substituting the compressor efficiency into a compressor power function reflecting the flow rate of the intake air passing through the compressor, the temperature of the exhaust gas upstream of the turbine, and the temperature of the exhaust gas downstream of the turbine of the status information;
- estimating a base boost pressure via an inverse function of the compressor power function assuming that the turbine power minimum value and the compressor power minimum value are equal;
- after estimating the base boost pressure, determining that an overboost has occurred when the base boost pressure exceeds a target boost pressure;
- and
- performing overboost preventing control, when the overboost occurs, to reduce the base boost pressure by controlling an amount of opening of a throttle valve to place a turbocharger in a controllable region.
Dependencies are inferred from the claim text.