System for automatically selecting an oil pressure sensor processing algorithm based on oil pressure sensor type

• US 6,775,626 B1
• Filed: 02/28/2003
• Issued: 08/10/2004
• Est. Priority Date: 02/28/2003
• Status: Active Grant

• Current Assignee: Cummins Incorporated
• Original Assignee: Cummins Incorporated
• Inventors: Bachmann, Christopher H., Huey, Gregory A., Daiker, Jeffrey D., Gatewood, Bryan S.
• Primary Examiner(s): Barlow, John
• Assistant Examiner(s): VO, HIEN XUAN
• Application Number:
  US10/376,820
• Time in Patent Office: 529 Days
• Field of Search: 702/50, 702/52, 702/55, 702/57, 702/47, 702/104, 340/603, 315/86, 315/82, 307/10.8, 73/540.1, 73/644.1, 733/04.C, 73/540.6, 73/617.8
• US Class Current: 702/50
• CPC Class Codes: F02D 2200/024 Fluid pressure of lubricating oil or working fluid
• CPC Class Codes: F02D 41/28 Interface circuits

Abstract

A system for automatically selecting an oil pressure sensor processing algorithm based on oil pressure sensor type includes an oil pressure sensing device producing an signal indicative of engine oil pressure, and electrically connected to one of an analog and a switch input of a control computer. The control computer is configured to identify the oil pressure sensing device as an analog oil pressure sensor and process the oil pressure signal according a corresponding signal processing algorithm if a voltage level at the analog input is within a predefined voltage range while a voltage level at the switch input is at or near a first voltage level, and to identify the oil pressure sensing device as an oil pressure switch and process the oil pressure signal according a corresponding signal processing algorithm if the voltage level at the switch input is at or near a second voltage level.

Claims

1. System for automatically selecting an oil pressure sensor processing algorithm based on oil pressure sensor type, the system comprising:

an oil pressure sensing device producing an oil pressure signal indicative of oil pressure in an internal combustion engine, said oil pressure sensing device being one of an analog oil pressure sensor and an oil pressure switch; and

a control computer having an analog input and a switch input with said oil pressure sensing device electrically connected to one of said analog and switch inputs, said control computer identifying said oil pressure sensing device as said analog oil pressure sensor and processing said oil pressure signal according a corresponding analog oil pressure sensor processing algorithm if a voltage level at said analog input is within a predefined voltage range while a voltage level at said switch input is at or near a first voltage level, said control computer identifying said oil pressure sensing device as said oil pressure switch and processing said oil pressure signal according a corresponding oil pressure switch processing algorithm if said voltage level at said switch input is at or near a second voltage level different from said first voltage level.

2. The system of claim 1 further including an ignition switch having at least an off position and an on position;

wherein said control computer is responsive to said ignition switch switching from said off position to said on position to monitor said voltage level at said analog input and said voltage level at said switch input, said control computer identifying said oil pressure sensing device as said analog oil pressure sensor if said voltage level at said analog input is within said predefined voltage range and said voltage at said switch input is at or near said first voltage level.

3. The system of claim 2 wherein said predefined voltage range is defined between a third voltage level greater than ground potential and a supply voltage;

and wherein said first voltage level is said supply voltage.

4. The system of claim 1 further including an ignition switch having at least an off position and an on position;

wherein said control computer is responsive to said ignition switch switching from said off position to said on position to monitor said voltage level at said analog input and said voltage level at said switch input, said control computer identifying said oil pressure sensing device as said oil pressure switch if said voltage level at said switch input is at or near said second voltage level.

5. The system of claim 4 wherein said second voltage level is ground potential.

6. The system of claim 1 wherein said control computer is configured to conduct an initial identification of said oil pressure sensing device if said oil pressure sensing device was not identified in a preceding engine operating cycle.

7. The system of claim 6 further including:

an ignition switch having at least an off position and an on position; and

an engine speed sensor producing an engine speed signal indicative of engine rotational speed;

and wherein said control computer is responsive to said ignition switch switching from said off position to said on position to conduct said initial identification of said oil pressure sensing device by monitoring said voltage level at said analog input and said voltage level at said switch input and determining a first oil pressure sensing device type based on said voltage levels at said analog and switch inputs, said control computer identifying said oil pressure sensing device as said first oil pressure sensing device type if said engine speed signal remains below an engine speed threshold for a predefined time period.

8. The system of claim 7 wherein said control computer is configured to determine a second oil pressure sensor device type based on said voltage levels at said analog and switch inputs if said engine speed signal does not remain below said engine speed threshold for said predefined time period, said control computer identifying said oil pressure sensor device as said first oil pressure sensing device type if said first and second oil pressure sensor device types are identical and otherwise identifying said oil pressure sensor device as a preselected one of said analog oil pressure sensor and said oil pressure switch.

9. The system of claim 8 wherein said preselected one of said analog oil pressure sensor and said oil pressure switch is said oil pressure switch.

16. The system of claim 8 wherein said preselected one of said analog oil pressure sensor and said oil pressure switch is said oil pressure switch.

10. System for automatically selecting an oil pressure sensor processing algorithm based on oil pressure sensor type, the system comprising:

an oil pressure sensing device producing an oil pressure signal indicative of oil pressure in an internal combustion engine, said oil pressure sensing device being one of an analog oil pressure sensor and an oil pressure switch; and

a control computer having an analog input and a switch input with said oil pressure sensing device electrically connected to one of said analog and switch inputs, said control computer identifying said oil pressure sensing device as said analog oil pressure sensor and processing said oil pressure signal according a corresponding analog oil pressure sensor processing algorithm if a voltage level at said analog input is at or near a first voltage level and a voltage level at said switch input is at or near a second voltage level different than said first voltage level and if said oil pressure sensing device was identified in a preceding engine operating cycle as an said analog oil pressure sensor.

11. The system of claim 10 further including an ignition switch having at least an off position and an on position;

wherein said control computer is responsive to said ignition switch switching from said off position to said on position to monitor said voltage level at said analog input and said voltage level at said switch input, said control computer identifying said oil pressure sensing device as said analog oil pressure sensor if said voltage level at said analog input is at or near said first voltage level and said voltage level at said switch input is at or near said second voltage level and if said oil pressure sensing device was identified in a preceding engine operating cycle as an said analog oil pressure sensor.

12. The system of claim 11 wherein said first voltage level is ground potential;

and wherein said second voltage level is a supply voltage.

13. The system of claim 10 wherein said control computer is configured to conduct an initial identification of said oil pressure sensing device if said oil pressure sensing device was not identified in a preceding engine operating cycle.

14. The system of claim 13 further including:

an ignition switch having at least an off position and an on position; and

an engine speed sensor producing an engine speed signal indicative of engine rotational speed;

and wherein said control computer is responsive to said ignition switch switching from said off position to said on position to conduct said initial identification of said oil pressure sensing device by monitoring said voltage level at said analog input and said voltage level at said switch input and determining a first oil pressure sensing device type based on said voltage levels at said analog and switch inputs, said control computer identifying said oil pressure sensing device as said first oil pressure sensing device type if said engine speed signal remains below an engine speed threshold for a predefined time period.

15. The system of claim 14 wherein said control computer is configured to determine a second oil pressure sensor device type based on said voltage levels at said analog and switch inputs if said engine speed signal does not remain below said engine speed threshold for said predefined time period, said control computer identifying said oil pressure sensor device as said first oil pressure sensing device type if said first and second oil pressure sensor device types are identical and otherwise identifying said oil pressure sensor device as a preselected one of said analog oil pressure sensor and said oil pressure switch.

17. System for automatically selecting an oil pressure sensor processing algorithm based on oil pressure sensor type, the system comprising:

an oil pressure sensing device producing an oil pressure signal indicative of oil pressure in an internal combustion engine, said oil pressure sensing device being one of an analog oil pressure sensor and an oil pressure switch; and

a control computer having an analog input and a switch input with said oil pressure sensing device electrically connected to one of said analog and switch inputs, said control computer identifying said oil pressure sensing device as said oil pressure switch and processing said oil pressure signal according a corresponding oil pressure switch processing algorithm if a voltage level at said analog input is at or near a first voltage level and a voltage level at said switch input is at or near a second voltage level different than said first voltage level and if said oil pressure sensing device was identified in a preceding engine operating cycle as an said oil pressure switch.

18. The system of claim 17 further including an ignition switch having at least an off position and an on position;

wherein said control computer is responsive to said ignition switch switching from said off position to said on position to monitor said voltage level at said analog input and said voltage level at said switch input, said control computer identifying said oil pressure sensing device as said oil pressure switch if said voltage level at said analog input is at or near said first voltage level and said voltage level at said switch input is at or near said second voltage level and if said oil pressure sensing device was identified in a preceding engine operating cycle as an said oil pressure switch.

19. The system of claim 18 wherein said first voltage level is ground potential;

and wherein said second voltage level is a supply voltage.

20. The system of claim 17 wherein said control computer is configured to conduct an initial identification of said oil pressure sensing device if said oil pressure sensing device was not identified in a preceding engine operating cycle.

21. The system of claim 20 further including:

an ignition switch having at least an off position and an on position; and

an engine speed sensor producing an engine speed signal indicative of engine rotational speed;

and wherein said control computer is responsive to said ignition switch switching from said off position to said on position to conduct said initial identification of said oil pressure sensing device by monitoring said voltage level at said analog input and said voltage level at said switch input and determining a first oil pressure sensing device type based on said voltage levels at said analog and switch inputs, said control computer identifying said oil pressure sensing device as said first oil pressure sensing device type if said engine speed signal remains below an engine speed threshold for a predefined time period.

22. The system of claim 21 wherein said control computer is configured to determine a second oil pressure sensor device type based on said voltage levels at said analog and switch inputs if said engine speed signal does not remain below said engine speed threshold for said predefined time period, said control computer identifying said oil pressure sensor device as said first oil pressure sensing device type if said first and second oil pressure sensor device types are identical and otherwise identifying said oil pressure sensor device as a preselected one of said analog oil pressure sensor and said oil pressure switch.

23. The system of claim 22 wherein said preselected one of said analog oil pressure sensor and said oil pressure switch is said oil pressure switch.