Engine Control Method

• US 20080098734A1
• Filed: 10/27/2006
• Published: 05/01/2008
• Est. Priority Date: 10/27/2006
• Status: Abandoned Application

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Olsson, Jan-Ola
• Application Number:
  US11/553,940
• Publication Number:
  US 20080098734A1
• Time in Patent Office: Days
• US Class Current: 60/605.1
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02D 2200/0402 the parameter being determined by using a model of the engine intake or its components
• CPC Class Codes: F02D 2200/0411 Volumetric efficiency
• CPC Class Codes: F02D 23/00 Controlling engines characterised by their being supercharged
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/18 by measuring intake air flow
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A method and apparatus is shown for operating an internal combustion engine having a turbocharger, comprising comparing estimated air flow to a mass air flow sensor signal to create a flow deviation signal, using the flow deviation signal and a modeled volumetric efficiency to calculate a required intake pressure, and using the required intake pressure as a set point for boost pressure control.

Claims

1. A method of operating an internal combustion engine having a turbocharger, the method comprising:

comparing estimated air flow to a measured mass air flow to create a flow deviation;

determining an intake pressure correction using the flow deviation and a modeled volumetric efficiency; and

adjusting boost pressure using the intake pressure correction to reach a set point for boost pressure control.

2. The method of claim 1 wherein the estimated air flow is based on measured boost pressure, throttle angle and volumetric efficiency.

3. The method of claim 2 wherein the measured boost pressure is determined using a boost pressure sensor.

4. The method of claim 1 wherein the boost pressure set point is determined by calculating a required intake pressure, adding a required throttle pressure drop to the required intake pressure to generate a calculated boost pressure, a and only setting the boost pressure set point if the calculated boost pressure is within upper and lower limitations.

5. The method of claim 1 further comprising, providing a target torque by adjusting boost pressure.

6. The method of claim 1 wherein the estimated air flow is calculated without using a manifold absolute pressure sensor.

7. The method of claim 1 wherein a correct volumetric efficiency is not explicitly calculated.

8. A computer readable storage medium having stored data representing instructions executable by a computer for controlling an internal combustion engine having a turbocharger, the computer readable storage medium comprising instructions for:

comparing estimated air flow to a measured mass air flow to create a flow deviation;

calculating an intake pressure correction using the flow deviation and a modeled volumetric efficiency; and

adjusting boost pressure using the intake pressure correction to reach a set point for boost pressure control.

9. The computer readable storage medium of claim 8 further comprising instructions for estimating air flow based on measured boost pressure, throttle angle and volumetric efficiency.

10. The computer readable storage medium of claim 9 wherein the measured boost pressure is determined using a boost pressure sensor.

11. The computer readable storage medium of claim 8 further comprising instructions for determining a boost pressure set point by calculating a required intake pressure, adding a required throttle pressure drop to the required intake pressure to generate a calculated boost pressure, and only setting the boost pressure set point if the calculated boost pressure is within upper and lower limitations.

12. The computer readable storage medium of claim 8 further comprising instructions for providing a target torque by adjusting boost pressure.

13. The computer readable storage medium of claim 8 wherein the estimated air flow is calculated without using a manifold absolute pressure sensor.

14. An engine, comprising:

a turbocharger to increase air flow in a combustion chamber;

a pressure sensor between the turbocharger and the combustion chamber;

a mass air flow sensor to measure intake air into the combustion chamber; and

a controller coupled to the turbocharger, pressure sensor and mass air flow sensor, the controller to;

compare an estimated air flow to a measured mass air flow sensor reading to create a flow deviation signal;

calculate an intake pressure correction using the flow deviation signal and a modeled volumetric efficiency; and

adjust boost pressure using the intake pressure correction to reach a set point for boost pressure control.

15. The engine of claim 14 wherein the estimated air flow is based on measured boost pressure, throttle angle and volumetric efficiency.

16. The engine of claim 15 wherein the measured boost pressure is determined using a boost pressure sensor.

17. The engine of claim 14 wherein the boost pressure set point is determined by calculating a required intake pressure, adding a required throttle pressure drop to the required intake pressure to generate a calculated boost pressure, and only setting the boost pressure set point if the calculated boost pressure is within upper and lower limitations.

18. The engine of claim 14 wherein the controller can adjust boost pressure to provide a target torque.

19. The engine of claim 14 wherein the estimated air flow is calculated without using a manifold absolute pressure sensor.

20. The engine of claim 14 wherein a correct volumetric efficiency is not explicitly calculated.