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-9879593-B2
Application number	US-201514957758-A
Country	US
Kind code	B2
Filing date	Dec 3, 2015
Priority date	Dec 3, 2015
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

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 circuit 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 circuit that controls the turbocharger based on the target turbocharger position, wherein the target turbocharger position circuit 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.

2. A system comprising:
a target turbocharger position circuit 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 circuit that controls the turbocharger based on the target turbocharger position, 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.

3. The system of claim 2 wherein the target turbocharger position circuit adjusts the learning coefficients each time that the target turbocharger position is determined.

4. The system of claim 2 wherein the target turbocharger position circuit adjusts the learning coefficients based on a learning rate and an exhaust flow rate.

5. The system of claim 2 wherein, in response to engine operating conditions being steady state, the target turbocharger position circuit sets a sum of the first, second, and third terms equal to zero and solves for the target turbocharger position.

6. The system of claim 2 wherein, in response to engine operating conditions being transient, the target turbocharger position circuit:
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.

7. The system of claim 2 wherein the target turbocharger position circuit 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.

8. The system of claim 7 wherein the target turbocharger position circuit determines the compressor power based on a reference value for the pressure ratio across the compressor.

9. The system of claim 7 wherein the target turbocharger position circuit determines the compressor power based on an actual value of the pressure ratio across the compressor.

10. 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;
controlling the turbocharger based on the target turbocharger position; and
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.

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, 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.

12. The method of claim 11 further comprising adjusting the learning coefficients each time that the target turbocharger position is determined.

13. The method of claim 11 further comprising adjusting the learning coefficients based on a learning rate and an exhaust flow rate.

14. The method of claim 11 further comprising, in response to engine operating conditions being steady state, setting a sum of the first, second, and third terms equal to zero and solving for the target turbocharger position.

15. The method of claim 11 wherein, in response to engine operating conditions being 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.

16. 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.

17. The method of claim 16 further comprising determining the compressor power based on a reference value for the pressure ratio across the compressor.

18. The method of claim 16 further comprising determining the compressor power based on an actual value of the pressure ratio across the compressor.

Assignees

• Gm Global Tech Operations Llc

Inventors

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

Classifications

• F02B37/24

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

• F02B37/186 Primary

  Arrangements of actuators or linkage for bypass valves · CPC title

• F05B2220/40

  in turbochargers · CPC title

• F02B37/18

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · 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