Granted Patent B1

US 7,735,478 · App. 12/276,915 · Granted Jun 15, 2010

Abstract

Claims (29)

1. A method of controlling an engine, the method comprising:

determining a ratio of specific heat by determining a mixture temperature, air fuel ratio, and a representation of an amount of residual gasses in a cylinder from a combination of one or more from the group of exhaust gas temperature, injected fuel quantity, air quantity inside a cylinder, mass air flow, air fuel ratio, manifold pressure, and a residual gas amount;

determining a mass fraction burned in response to a cylinder volume, the mixture temperature, air fuel ratio, manifold pressure, and the ratio of specific heat; and

controlling engine parameters based on mass fraction burned.

2. A method as recited in claim 1 wherein determining a mixture temperature, air fuel ratio, and a representation of an amount of residual gasses comprises forming a polynomial in a polynomial block of a gamma module.

3. A method as recited in claim 1 wherein determining a mass fraction burned in response to a cylinder volume, the mixture temperature, air fuel ratio, manifold pressure, and the ratio of specific heat comprises determining a mass fraction burned in response to a cylinder volume, a change in cylinder volume, the mixture temperature, air fuel ratio, intake manifold pressure, and the ratio of specific heat.

4. A method as recited in claim 1 wherein determining a mass fraction burned in response to a cylinder volume, the mixture temperature, air fuel ratio, manifold pressure, and the ratio of specific heat comprises determining a mass fraction burned in response to a cylinder volume, a change in cylinder volume, the mixture temperature, air fuel ratio, a cylinder pressure, and the ratio of specific heat.

5. A method as recited in claim 1 wherein controlling an engine parameter comprises controlling dilution.

6. A method as recited in claim 5 wherein controlling dilution comprises controlling an exhaust gas recirculation valve.

7. A method as recited in claim 1 wherein determining a mass fraction burned comprises determining a mass fraction burned in response to a Taylor series expansion.

8. A method of controlling an engine comprising:

forming a table output from a two-dimensional table from two inputs selected from the group of exhaust gas temperature, injected fuel quantity, air quantity inside a cylinder, mass air flow, air fuel ratio, manifold pressure, a residual gas amount, and a correction factor selected from the group not one of the two inputs selected to form the two-dimensional table;

determining a mass fraction burned in response to a cylinder volume, the table output and the correction factor; and

controlling engine parameters based on mass fraction burned.

9. A method as recited in claim 8 wherein determining a mass fraction burned in response to a cylinder volume, the table output and the correction factor comprises determining a mass fraction burned in response to a cylinder volume, a change in cylinder volume, the table output, and the correction factor.

10. A method as recited in claim 8 wherein determining a mass fraction burned comprises adding the table output and the correction factor together.

11. A method as recited in claim 8 wherein determining a mass fraction burned comprises multiplying the table output and the correction factor together.

12. A method as recited in claim 8 wherein controlling an engine parameter comprises controlling dilution.

13. A method as recited in claim 12 wherein controlling dilution comprises controlling an exhaust gas recirculation valve.

14. A method as recited in claim 8 wherein determining a mass fraction burned comprises determining a mass fraction burned in response to a Taylor series expansion.

15. A system comprising:

a plurality of engine sensors; and

a control module determining a ratio of specific heat from a combination of one or more from the group of exhaust gas temperature, injected fuel quantity, air quantity inside a cylinder, mass air flow, air fuel ratio, manifold pressure, and a residual gas amount determined from the plurality of engine sensors,

said control module comprising a mass fraction burned module determining a mass fraction burned in response to a cylinder volume, and the ratio of specific heat, said control module controlling an engine parameter based on mass fraction burned.

16. A system as recited in claim 15 wherein said control module comprising a two-dimensional table having a table output from two inputs selected from the group of exhaust gas temperature, injected fuel quantity, air quantity inside a cylinder, mass air flow, air fuel ratio, manifold pressure, and a residual gas amount, said control module forming a correction factor selected from the group not one of the two inputs selected from the group.

17. A method as recited in claim 16 wherein the control module determines the ratio of specific heat by adding the correction factor and the table output.

18. A method as recited in claim 16 wherein the control module determines the ratio of specific heat by multiplying the correction factor and the table output.

19. A method as recited in claim 16 wherein the control module forms a polynomial representative of mixture temperature, air fuel ratio, and an amount of residual gasses in a cylinder from the at least two from the group.

20. A method as recited in claim 16 wherein the controller controls dilution of input gasses.

Assignments (12)