Method and system for enhanced engine control based on cylinder pressure

• US 20020066437A1
• Filed: 12/05/2000
• Published: 06/06/2002
• Est. Priority Date: 12/05/2000
• Status: Active Grant

• Current Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Original Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Inventors: Weisman, Steven M.
• Granted Patent: US 6,516,781 B2
• Time in Patent Office: Days
• US Class Current: 123/435
• CPC Class Codes: F02D 17/04 rendering engines inoperative or idling, e.g. caused by abnormal conditions dependent on lubricating conditions F01M1/22; dependent on cooling F01P5/14
• CPC Class Codes: F02D 2200/0414 Air temperature
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 35/023 by determining the cylinder pressure
• CPC Class Codes: F02D 41/008 Controlling each cylinder individually
• CPC Class Codes: F02D 41/1446 the characteristics being exhaust temperatures
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809

Abstract

A method for controlling an engine having a cylinder includes sensing cylinder pressure; comparing the cylinder pressure to a pressure threshold; and adjusting an engine control parameter when the cylinder pressure exceeds the pressure threshold. A system for controlling engine operation is also provided.

Claims

1. A method for controlling an engine having a cylinder, the method comprising:

sensing cylinder pressure;

comparing the cylinder pressure to a pressure threshold; and

adjusting an engine control parameter when the cylinder pressure exceeds the pressure threshold.

2. The method of claim 1 wherein adjusting an engine control parameter includes reducing available engine torque.

3. The method of claim 1 wherein adjusting an engine control parameter includes reducing fuel supplied to the cylinder.

4. The method of claim 1 wherein adjusting an engine control parameter includes advancing timing of a fuel injection to the cylinder.

5. The method of claim 1 wherein adjusting an engine control parameter includes reducing the amount of air supplied to the engine.

6. The method of claim 1 wherein adjusting an engine control parameter includes adjusting exhaust gas re-circulation rate.

7. The method of claim 1 wherein adjusting an engine control parameter includes reducing engine loading.

8. The method of claim 1 wherein adjusting an engine control parameter includes adjusting the engine control parameter so as to shut down the engine.

9. The method of claim 1 further comprising:

comparing the cylinder pressure to an additional pressure threshold; and

shutting down the engine when the cylinder pressure exceeds the additional pressure threshold.

10. A system for controlling engine operation, the system comprising:

a cylinder pressure sensor for sensing cylinder pressure; and

a controller in communication with the cylinder pressure sensor, the controller including control logic for comparing the cylinder pressure to a pressure threshold, and control logic for adjusting an engine control parameter when the cylinder pressure exceeds the pressure threshold.

11. The system of claim 10 further comprising an engine warning indicator in communication with the controller, the engine warning indicator being activated when the cylinder pressure exceeds the pressure threshold.

12. The system of claim 10 wherein the controller further comprises control logic for comparing the cylinder pressure to an additional pressure threshold, and control logic for generating an engine shutdown signal when the cylinder pressure exceeds the additional pressure threshold.

14. The computer readable storage medium of claim 13 wherein instructions for adjusting an engine control parameter include instructions for reducing fuel supplied to the engine.

15. The computer readable storage medium of claim 13 wherein instructions for adjusting an engine control parameter include instructions for advancing timing of a fuel injection to the engine.

16. The computer readable storage medium of claim 13 wherein instructions for adjusting an engine control parameter include instructions for adjusting air supplied to the engine.

17. The computer readable storage medium of claim 13 wherein instructions for adjusting an engine control parameter include instructions for adjusting exhaust gas re-circulation rate to the engine.

18. The computer readable storage medium of claim 13 wherein instructions for adjusting an engine control parameter include instructions for reducing engine loading.

19. The computer readable storage medium of claim 13 further comprising:

instructions for comparing the cylinder pressure to an additional pressure threshold; and

instructions for shutting down the engine when the cylinder pressure exceeds the additional pressure threshold.

13. A computer readable storage medium having information stored thereon representing instructions executable by an engine controller in communication with a cylinder pressure sensor and an engine, the computer readable storage medium comprising:

instructions for determining cylinder pressure based on signals provided by the cylinder pressure sensor;

instructions for comparing the cylinder pressure to a pressure threshold; and

instructions for adjusting an engine control parameter when the cylinder pressure exceeds the pressure threshold.