System and method for adaptively learning values and controlling a turbocharger of an engine based on the values

Patent metadata

Field	Value
Publication number	US-2017159554-A1
Application number	US-201514957758-A
Country	US
Kind code	A1
Filing date	Dec 3, 2015
Priority date	Dec 3, 2015
Publication date	Jun 8, 2017
Grant date	—

Abstract

A system according to the principles of the present disclosure includes a target turbocharger position module and a turbocharger control module. The target turbocharger position module determines a target position of a turbocharger based on a relationship between power generated by a compressor of the turbocharger, inertia of a shaft in a turbine of the turbocharger, and power generated by the turbine. The target turbocharger position includes at least one of a target vane position and a target wastegate position. The turbocharger control module controls the turbocharger based on the target turbocharger position.

First claim

What is claimed is:

1 . A system comprising:
a target turbocharger position module that determines a target position of a turbocharger based on a relationship between power generated by a compressor of the turbocharger, inertia of a shaft in a turbine of the turbocharger, and power generated by the turbine, wherein the target turbocharger position includes at least one of a target vane position and a target wastegate position; and a turbocharger control module that controls the turbocharger based on the target turbocharger position.

2 . The system of claim 1 wherein the target turbocharger position module determines the compressor power based on a pressure ratio across the compressor, a mass flow rate of ambient air, a pressure of ambient air, and a temperature of ambient air.

3 . The system of claim 2 wherein the target turbocharger position module determines the compressor power based on a reference value for the pressure ratio across the compressor.

4 . The system of claim 2 wherein the target turbocharger position module determines the compressor power based on an actual value of the pressure ratio across the compressor.

5 . The system of claim 1 wherein the target turbocharger position module determines the turbine shaft inertia based on an amount of intake air flow through the compressor and a rate of change in the amount of intake air flow through the compressor.

6 . The system of claim 1 wherein:
the relationship includes a first term representing the compressor power, a second term representing the turbine shaft inertia, and a third term representing the turbine power; and
the third term is a function of enthalpy of exhaust gas, the target turbocharger position, exhaust flow rate through at least one of the turbine and a wastegate that allows exhaust to bypass the turbine, and learning coefficients.

7 . The system of claim 6 wherein the target turbocharger position module adjusts the learning coefficients each time that the target turbocharger position is determined.

8 . The system of claim 6 wherein the target turbocharger position module adjusts the learning coefficients based on a learning rate and an exhaust flow rate.

9 . The system of claim 6 wherein, when engine operating conditions are steady state, the target turbocharger position module sets a sum of the first, second, and third terms equal to zero and solves for the target turbocharger position.

10 . The system of claim 6 wherein, when engine operating conditions are transient, the target turbocharger position module:
determines a first value of the compressor power based on a previous value of the target turbocharger position;
determines a change in a pressure ratio across the compressor based on a sum of the first, second, and third terms using the first value of the compressor power for the first term;
determines a present value of the pressure ratio across the compressor based on a sum of a previous value of the pressure ratio across the compressor and the change in the pressure ratio across the compressor;
determines a second value of the compressor power based on the present value of the pressure ratio;
sets a sum of the first, second, and third terms equal to zero; and
solves for the target turbocharger position using the second value of the compressor power for the first term.

11 . A method comprising:
determining a target position of a turbocharger based on a relationship between power generated by a compressor of the turbocharger, inertia of a shaft in a turbine of the turbocharger, and power generated by the turbine, wherein the target turbocharger position includes at least one of a target vane position and a target wastegate position; and controlling the turbocharger based on the target turbocharger position.

12 . The method of claim 11 further comprising determining the compressor power based on a pressure ratio across the compressor, a mass flow rate of ambient air, a pressure of ambient air, and a temperature of ambient air.

13 . The method of claim 12 further comprising determining the compressor power based on a reference value for the pressure ratio across the compressor.

14 . The method of claim 12 further comprising determining the compressor power based on an actual value of the pressure ratio across the compressor.

15 . The method of claim 11 further comprising determining the turbine shaft inertia based on an amount of intake air flow through the compressor and a rate of change in the amount of intake air flow through the compressor.

16 . The method of claim 11 wherein:
the relationship includes a first term representing the compressor power, a second term representing the turbine shaft inertia, and a third term representing the turbine power; and
the third term is a function of enthalpy of exhaust gas, the target turbocharger position, exhaust flow rate through at least one of the turbine and a wastegate that allows exhaust to bypass the turbine, and learning coefficients.

17 . The method of claim 16 further comprising adjusting the learning coefficients each time that the target turbocharger position is determined.

18 . The method of claim 16 further comprising adjusting the learning coefficients based on a learning rate and an exhaust flow rate.

19 . The method of claim 16 further comprising, when engine operating conditions are steady state, setting a sum of the first, second, and third terms equal to zero and solving for the target turbocharger position.

20 . The method of claim 16 wherein, when engine operating conditions are transient, the method further comprises:
determining a first value of the compressor power based on a previous value of the target turbocharger position;
determining a change in a pressure ratio across the compressor based on a sum of the first, second, and third terms using the first value of the compressor power for the first term;
determining a present value of the pressure ratio across the compressor based on a sum of a previous value of the pressure ratio across the compressor and the change in the pressure ratio across the compressor;
determining a second value of the compressor power based on the present value of the pressure ratio;
setting a sum of the first, second, and third terms equal to zero; and
solving for the target turbocharger position using the second value of the compressor power for the first term.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Wang Yue-Yun
• Muldoon Steven E
• Bernards Jörg
• Suchy Martin

Classifications

• F05B2220/40

  in turbochargers · CPC title

• F02B37/186 Primary

  Arrangements of actuators or linkage for bypass valves · CPC title

• F02B37/24

  by using pumps or turbines with adjustable guide vanes · CPC title

• F02B37/183

  Arrangements of bypass valves or actuators therefor · CPC title

• F02B37/22

  by varying cross-section of exhaust passages or air passages {, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits} (F02B37/24 takes precedence) · CPC title