Oil condition sensing methods and systems
View Patent ↗An engine oil system comprises an oil condition sensing device and a control module. The oil condition sensing device includes an electrically actuated member and is in fluid communication with an engine oil reservoir. The control module selectively causes current to be supplied to the oil condition sensing device to actuate the member, measures the current, determines a parameter of the current, and selectively identifies at least two of an oil level, an oil change event, and an oil viscosity level based on the parameter.
1. An engine oil system comprising:
an oil condition sensing device that includes an electrically actuated member, wherein the oil condition sensing device is in fluid communication with an engine oil reservoir; and
a control module that selectively causes current to be supplied to the oil condition sensing device to actuate the member, that measures the current, that determines a parameter of the current, and that selectively identifies at least two of an oil level, an oil change event, and an oil viscosity level based on the parameter.
2. The engine oil system of claim 1 wherein the parameter is based on a time of a local minimum of the current while the member is actuating.
3. The engine oil system of claim 2 wherein the parameter is based on a time delay between a trigger time and the time of the local minimum, wherein the control module causes current to be supplied to the oil condition sensing device at the trigger time.
4. The engine oil system of claim 1 wherein the member is actuated to a first position when current is supplied and returns to a second position when current is not supplied.
5. The engine oil system of claim 1 wherein the oil level represents an oil level of the engine oil reservoir.
6. The engine oil system of claim 1 wherein the oil viscosity level represents an oil viscosity level of a sample of oil from the engine oil reservoir.
7. The engine oil system of claim 1 wherein the oil condition sensing device includes first and second orifices, and wherein when the member is actuated, a first fluid is forced through the first orifice and a second fluid is forced through the second orifice.
8. The engine oil system of claim 7 wherein the control module determines that the first fluid is one of air and oil and that the second fluid is one of air and oil based on the parameter.
9. The engine oil system of claim 8 wherein the first orifice is positioned higher than the second orifice.
10. The engine oil system of claim 9 wherein the control module identifies the oil level as below a first predetermined level when the second fluid is air.
11. The engine oil system of claim 10 wherein the control module identifies the oil level as between the first predetermined level and a second predetermined level when the first fluid is air and the second fluid is oil, wherein the second predetermined level is greater than the first predetermined level.
12. The engine oil system of claim 11 wherein the control module identifies the oil level as above the second predetermined level when the first fluid and second fluids are oil.
13. The engine oil system of claim 8 wherein the control module determines a state of the oil condition sensing device, where a first state corresponds to when the second fluid is air, a second state corresponds to when the first fluid is air and the second fluid is oil, and a third state corresponds to when the first and second fluids are oil.
14. The engine oil system of claim 13 wherein the control module actuates the member, records the state of the oil condition sensing device, and then actuates the member.
15. The engine oil system of claim 14 wherein the control module, after recording the state and actuating the member, actuates the member until a change in the parameter is less than a predetermined threshold.
16. The engine oil system of claim 14 wherein the control module measures the oil viscosity level when the state of the oil condition sensing device is the third state.
17. The engine oil system of claim 14 wherein the control module identifies the oil change event when the state of the oil condition sensing device is the third state, the recorded state is the first state, and a value of the state of the oil condition sensing device from before a previous engine shutdown is one of the second and third states.
18. The engine oil system of claim 14 wherein the control module identifies the oil change event when the state of the oil condition sensing device is the third state and the recorded state is the first state.
19. The engine oil system of claim 18 wherein the oil condition sensing device includes a chamber with an opening that is sealed by an oil drain plug.
20. The engine oil system of claim 19 wherein the chamber is separated from a main portion of the engine oil reservoir by the first orifice.
21. The engine oil system of claim 20 wherein oil from the main portion is transferred to the chamber when the member is actuated.
22. The engine oil system of claim 21 wherein the second orifice is formed axially through the member.
23. A method comprising:
selectively causing current to be supplied to an oil condition sensing device to actuate a member of the oil condition sensing device;
measuring the current supplied to the oil condition sensing device;
determining a parameter of the current; and
selectively identifying at least two of an oil level, an oil change event, and an oil viscosity level based on the parameter.
24. The method of claim 23 wherein the parameter is based on a time of a local minimum of the current while the member is actuating.
25. The method of claim 24 wherein the parameter is based on a time delay between a trigger time and the time of the local minimum, wherein the current is caused to be supplied to the oil condition sensing device at the trigger time.
26. The method of claim 23 wherein the member is actuated to a first position when current is supplied and returns to a second position when current is not supplied.
27. The method of claim 23 wherein the oil level represents an oil level of an engine oil reservoir.
28. The method of claim 27 wherein the oil viscosity level represents an oil viscosity level of a sample of oil from the engine oil reservoir.
29. The method of claim 23 wherein the oil condition sensing device includes first and second orifices, and further comprising forcing a first fluid through the first orifice and a second fluid through the second orifice when the member is actuated.
30. The method of claim 29 further comprising determining that the first fluid is one of air and oil and that the second fluid is one of air and oil based on the parameter.
31. The method of claim 30 wherein the first orifice is positioned higher than the second orifice.
32. The method of claim 31 further comprising identifying the oil level as below a first predetermined level when the second fluid is air.
33. The method of claim 32 further comprising identifying the oil level as between the first predetermined level and a second predetermined level when the first fluid is air and the second fluid is oil, wherein the second predetermined level is greater than the first predetermined level.
34. The method of claim 33 further comprising identifying the oil level as above the second predetermined level when the first fluid and second fluids are oil.
35. The method of claim 30 further comprising determining a state of the oil condition sensing device, where a first state corresponds to when the second fluid is air, a second state corresponds to when the first fluid is air and the second fluid is oil, and a third state corresponds to when the first and second fluids are oil.
36. The method of claim 35 further comprising:
actuating the member;
recording the state of the oil condition sensing device resulting from the actuating; and
actuating the member after the recording.
37. The method of claim 36 further comprising, after recording the state and actuating the member, actuating the member until a change in the parameter between actuations is less than a predetermined threshold.
38. The method of claim 36 further comprising measuring the oil viscosity level when the state of the oil condition sensing device is the third state.
39. The method of claim 36 further comprising identifying the oil change event when the state of the oil condition sensing device is the third state, the recorded state is the first state, and a value of the state of the oil condition sensing device from before a previous engine shutdown is one of the second and third states.
40. The method of claim 36 further comprising identifying the oil change event when the state of the oil condition sensing device is the third state and the recorded state is the first state.
41. The method of claim 40 wherein the oil condition sensing device includes a chamber with an opening that is sealed by an oil drain plug.
42. The method of claim 41 wherein the chamber is separated from a main portion of an engine oil reservoir by the first orifice.
43. The method of claim 42 wherein oil from the main portion is transferred to the chamber when the member is actuated.
44. The method of claim 43 wherein the second orifice is formed axially through the member.