IP Library › Granted Patent US 8,989,989
Granted Patent B2
US 8,989,989 · App. 13/613,514 · Granted Mar 24, 2015

System and method for controlling fuel injection in an engine based on piston temperature

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Quick Facts
Patent No.
US 8,989,989
App. No.
13/613,514
Granted
Mar 24, 2015
Kind
B2
Abstract

A system according to the principles of the present disclosure includes a temperature estimation module and a fuel control module. The temperature estimation module estimates a piston temperature associated with a cylinder based on engine operating conditions. The fuel control module controls at least one of injection timing associated with the cylinder, injection pressure associated with a cylinder, injection location associated with a cylinder, and a number of injections per engine cycle associated with the cylinder based on the piston temperature.

Claims (36)

1. A system comprising:

a temperature estimation module that estimates a piston temperature associated with a cylinder based on engine operating conditions; and

a fuel control module that controls at least one of an injection pressure associated with the cylinder, an injection location associated with the cylinder, and a number of injections per engine cycle associated with the cylinder based on the piston temperature.

2. The system of claim 1 wherein the fuel control module controls an injection timing associated with the cylinder, the injection pressure associated with the cylinder, the injection location associated with the cylinder, and the number of injections per engine cycle associated with the cylinder based on the piston temperature.

3. A system comprising:

a temperature estimation module that estimates a piston temperature associated with a cylinder based on engine operating conditions; and

a fuel control module that controls at least one of an injection timing associated with the cylinder, an injection pressure associated with the cylinder, an injection location associated with the cylinder, and a number of injections per engine cycle associated with the cylinder based on the piston temperature, wherein the fuel control module commands multiple injections per engine cycle when the piston temperature is less than a predetermined temperature.

4. The system of claim 3 wherein the fuel control module retards the injection timing when the piston temperature is less than a predetermined temperature.

5. The system of claim 3 wherein the temperature estimation module estimates the piston temperature based on engine speed, engine load, and an air/fuel ratio.

6. The system of claim 4 wherein the piston temperature is directly proportional to the engine speed, the engine load, and the air/fuel ratio.

7. The system of claim 3 further comprising a temperature filter module that filters the piston temperature using a lag filter.

8. The system of claim 7 wherein the lag filter is a first order lag filter.

9. The system of claim 7 wherein the temperature filter module adjusts the lag filter based on at least one of engine speed and an iteration loop rate.

10. The system of claim 9 wherein the piston temperature is adjusted at a first rate that is directly proportional to the at least one of the engine speed and the iteration loop rate.

11. A system comprising:

a temperature estimation module that estimates a piston temperature associated with a cylinder based on engine operating conditions; and

a fuel control module that controls at least one of an injection timing associated with the cylinder, an injection pressure associated with the cylinder, an injection location associated with the cylinder, and a number of injections per engine cycle associated with the cylinder based on the piston temperature, wherein the temperature estimation module estimates the piston temperature based on engine speed, engine load, and an air/fuel ratio, intake air temperature, engine coolant temperature, and spark timing.

12. A method comprising:

estimating a piston temperature associated with a cylinder based on engine operating conditions; and

controlling at least one of an injection pressure associated with the cylinder, an injection location associated with the cylinder, and a number of injections per engine cycle associated with the cylinder based on the piston temperature.

13. The method of claim 12 further comprising controlling an injection timing associated with the cylinder, the injection pressure associated with the cylinder, the injection location associated with the cylinder, and the number of injections per engine cycle associated with the cylinder based on the piston temperature.

14. A method comprising:

estimating a piston temperature associated with a cylinder based on engine operating conditions;

controlling at least one of an injection timing associated with the cylinder, an injection pressure associated with the cylinder, an injection location associated with the cylinder, and a number of injections per engine cycle associated with the cylinder based on the piston temperature; and

commanding multiple injections per engine cycle when the piston temperature is less than a predetermined temperature.

15. The method of claim 14 further comprising retarding the injection timing when the piston temperature is less than a predetermined temperature.

16. The method of claim 14 further comprising estimating the piston temperature based on engine speed, engine load, and an air/fuel ratio.

17. The method of claim 16 wherein the piston temperature is directly proportional to the engine speed, the engine load, and the air/fuel ratio.

18. The method of claim 14 further comprising filtering the piston temperature using a lag filter.

19. The method of claim 18 wherein the lag filter is a first order lag filter.

20. The method of claim 18 further comprising adjusting the lag filter based on at least one of engine speed and an iteration loop rate.

21. The method of claim 20 wherein the piston temperature is adjusted at a first rate that is directly proportional to the at least one of the engine speed and the iteration loop rate.

22. A method comprising:

estimating a piston temperature associated with a cylinder based on engine operating conditions;

controlling at least one of an injection timing associated with the cylinder, an injection pressure associated with the cylinder, an injection location associated with the cylinder, and a number of injections per engine cycle associated with the cylinder based on the piston temperature; and

estimating the piston temperature further based on engine speed, engine load, and an air/fuel ratio, intake air temperature, engine coolant temperature, and spark timing.