Sensor and method for detecting oil deterioration and oil level

• US 8,340,928 B2
• Filed: 03/24/2010
• Issued: 12/25/2012
• Est. Priority Date: 09/05/2007
• Status: Active Grant

• Current Assignee: Yizhong Sun
• Original Assignee: Yizhong Sun
• Inventors: Sun, Yizhong
• Primary Examiner(s): Le, John H
• Application Number:
  US12/661,779
• Publication Number:
  US 20100180663A1
• Time in Patent Office: 1,007 Days
• Field of Search: 702 50- 52, 702/55, 702/57, 702/64, 702/100, 702/130, 701/29.5, 701/30, 324/441, 324/698, 340/438, 340/439, 340/450.3, 340/603, 184/103.2, 73/530.5, 73/614.3
• US Class Current: 702/52
• CPC Class Codes: G01F 23/265 for discrete levels
• CPC Class Codes: G01N 33/2847 Water in oils
• CPC Class Codes: G01N 33/2888 Lubricating oil characteristics, e.g. deterioration lubricating properties G01N33/30

Abstract

A capacitive sensor in its simplest form has three identical plated spatial electrodes, which are positioned equally spaced apart, in order, alignment and parallel with each other. The first and third electrodes are the outer electrodes and connected in parallel by a first lead wire serving as a first electrical pole to be a group of the integrated electrodes. The second electrode is the middle electrode and connected by a second lead wire serving as a second electrical pole. The sensor is applied with an alternating current (AC) excitation signal from an AC device. The present invention method includes application of referencing and sensing capacitive sensors to obtain a measured temperature compensated electrical property of the oil to thereby obtain a measured remaining usage so as to a predicted remaining usage of the oil. Therefore, the top oil level, or the normal, or the abnormal oil deterioration can be concluded according to the measured remaining usage which is respectively larger than, or similar to, or less than the predicted one of the oil.

Claims

1. A sensor for detecting oil deterioration and oil level, comprising:

a. a measurement sensor comprising a sensing capacitive sensor that includes left, middle and right identical upward plated electrodes having the respective top and bottom ends, said electrodes are positioned to be equally spaced apart in order, alignment and parallel with each other, wherein said top ends of the respective left and right electrodes are electrically connected in parallel by a first lead wire serving as a first electrical pole, said top end of said middle electrode is connected by a second lead wire serving as a second electrical pole, said measurement sensor is positioned into an oil system of a machine, wherein said sensing capacitive sensor is immersed into an oil that is dry and disposed into said oil system;

b. a reference sensor comprising a referencing capacitive sensor that is identical to said sensing capacitive sensor, said referencing capacitive sensor is immersed into a reference oil that is positioned inside of a sealed container of said reference sensor, said reference sensor is positioned in a common temperature environment with said oil of said oil system;

c. an alternating current (AC) analyzing device is connected to said sensing and referencing capacitive sensors, wherein said AC analyzing device applies an AC voltage at a frequency to said sensors from a first measurement to thereby detect first measured electrical properties of the respective sensing and referencing capacitive sensors;

d. said first measured electrical properties are combined to obtain a first measured temperature compensated electrical property of said sensing capacitive sensor, which represents a first measured temperature compensated electrical property of said oil;

e. a profile of predicted temperature compensated electrical properties of said oil is obtained so that said first measured temperature compensated electrical property of said oil is compared with a first predicted temperature compensated electrical property of said oil according to a first actual usage of said oil from said profile of said predicted properties;

f. a first predicted remaining usage of said oil is determined according to said first actual usage of said oil, and a second measured temperature compensated electrical property of said oil is obtained according to said first actual usage of said oil from a second measurement to thereby obtain a second measured remaining usage of said oil;

g. a normal deterioration of said oil is determined which occurs in the absence of water if said second measured remaining usage is similar to said first predicated remaining usage, and said second measured remaining usage is confirmed to represent a remaining actual usage of said oil;

h. an abnormal deterioration of said oil is determined which occurs in the presence of water if said second measured remaining usage is less than said first predicated remaining usage; and

i. a top level of said oil is determined to reduce to a top level of a predetermined threshold amount of said oil if said second measured remaining usage is larger than said first predicted remaining usage.

2. The sensor as claimed in claim 1 at step c, wherein said electrical property is selected from the group consisting of impedance, resistance, reactance, phase angle, voltage and current.

3. The sensor as claimed in claim 1, further comprising spacers of insulating materials that are positioned between two adjacent plated electrodes, and said electrodes are affixed by additional insulating means to thereby keep a fixed gap between said two adjacent plated electrodes.

4. The sensor as claimed in claim 1, said sensing capacitive sensor further includes a total of an odd number of identical plated electrodes that are positioned equally spaced apart, in order, alignment and parallel with each other, wherein odd numbered plated electrodes of said total electrodes are connected in parallel by a first lead wire serving as a first electrical pole to thereby form a first group of integrated electrodes, and even numbered electrodes are connected in parallel by a second lead wire serving as a second electrical pole to thereby form a second group of integrated electrodes.

5. The sensor as claimed in claim 1, wherein said sensing capacitive sensor is positioned to align with said top level of said predetermined threshold amount of said oil of said machine, wherein said oil is a lubricating oil, and said machine is an internal combustion engine.

6. The sensor as claimed in claim 1, wherein said reference oil is selected from the group consisting of an unused oil, a partially spent oil and spent oil, and said reference oil has a similar thermal property as compared with a thermal property of said oil.

7. The sensor as claimed in claim 1, further comprising:

a. a normal deterioration of said oil is determined which occurs in the absence of water if said second measured temperature compensated electrical property of said oil is similar to said first predicated temperature compensated electrical property of said oil;

b. an abnormal deterioration of said oil is determined which occurs in the presence of water if said second measured temperature compensated electrical property of said oil is less than said first predicated temperature compensated electrical property of said oil; and

c. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured temperature compensated electrical property of said oil is larger than said first predicated temperature compensated electrical property of said oil.

8. The sensor as claimed in claim 1 at step f, further comprising:

a. a second measured remaining actual usage of said oil is Δ

U_M2=(U_S−

U_M2), wherein said U_M2 is a second measured actual usage of said oil which is corresponding with said second measured temperature compensated electrical property, said U_S is an actual usage of said oil which is spent;

b. a first predicted remaining actual usage of said oil is Δ

U_P=U_S−

U_P, wherein said U_P is a first predicted actual usage of said oil which is corresponding with said first predicted property;

c. a normal deterioration of said oil is determined which occurs in the absence of water if said second measured remaining actual usage Δ

U_M2, is similar to said first predicted remaining actual usage Δ

U_P, and confirming said second measured remaining actual usage;

d. an abnormal deterioration of said oil is determined which occurs in the presence of water if said second measured remaining actual usage Δ

U_M2 is less than said first predicted remaining actual usage Δ

U_P; and

e. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured remaining actual usage Δ

U_M2 is larger than said first predicted remaining actual usage Δ

U_P.

9. The sensor as claimed in claim 1 at step f, further comprising:

a. a second measured temperature compensated electrical property of said sensing capacitive sensor according to a second actual usage of said oil is obtained from a second measurement to thereby represent a second measured temperature compensated electrical property of said oil according to said second actual usage of said oil, from which further to obtain a second measured remaining usage ratio and second measured remaining usage of said oil according to said second actual usage of said oil, a second predicted temperature compensated electrical property of said oil is obtained from said profile of said predicted temperature compensated electrical properties according to said second actual usage of said oil, from which further to obtain a second predicted remaining usage ratio and second predicted remaining usage of said oil according to said second actual usage of said oil;

b. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured remaining usage of said oil is larger than said second predicted remaining usage of said oil;

c. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured temperature compensated electrical property differs from said second predicted temperature compensated electrical property wherein said difference indicates less deterioration of said oil than deterioration predicted by said second predicted temperature compensated electrical property;

d. a presence of water in said oil is determined if said first and second measured temperature compensated electrical properties of said oil according to the respective first and second actual usages of said oil have a rate of change of deterioration of said oil which differs from a rate of change of deterioration predicted by said first and second predicted temperature compensated electrical properties of said oil according to the respective first and second actual usages of said oil, wherein said difference indicates extra deterioration of said oil than deterioration predicted by said first and second predicted temperature compensated electrical properties;

e. a likely presence of water in said oil is determined if said second measured temperature compensated electrical property of said oil having a value which exceeds a predetermined extreme value of said predicted temperature compensated electrical property profile, wherein said predetermined extreme value is exceeded at a said second actual usage which is earlier than an actual usage predicted by said predicted temperature compensated electrical property profile; and

f. a second calibration means for counting elapsed actual usages.

10. The sensor as claimed in claim 1 at step f, further comprising:

a. a second measured temperature compensated electrical property of said sensing capacitive sensor according to a second actual usage of said oil is obtained from a second measurement to thereby represent a second measured temperature compensated electrical property of said oil according to said second actual usage of said oil, from which further to obtain a second measured remaining actual usage of said oil, a second predicted temperature compensated electrical property of said oil is obtained from said profile of said predicted temperature compensated electrical properties according to said second actual usage of said oil, from which further to obtained a second predicted remaining actual usage of said oil;

b. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured remaining actual usage of said oil is larger than said second predicted remaining actual usage of said oil; and

c. a second calibration means for counting elapsed actual usages.

11. A sensor for detecting oil deterioration and oil level, comprising:

a. a measurement sensor comprising a sensing capacitive sensor that includes left, middle and right identical upward plated spatial electrodes having the respective top and bottom ends, said electrodes are positioned to be equally spaced apart in order, alignment and parallel with each other, wherein said top ends of the respective left and right electrodes are electrically connected in parallel by a first lead wire serving as a first electrical pole, said top end of said middle electrode is connected by a second lead wire serving as a second electrical pole, said measurement sensor is positioned into an oil system of a machine, wherein said sensing capacitive sensor is immersed into an oil that is dry and disposed into said oil system;

b. an alternating current (AC) analyzing device is connected to said sensing capacitive sensor, wherein said AC analyzing device applies an AC voltage at a frequency to said sensor from a first measurement to thereby detect a first measured temperature compensated electrical property of said sensing capacitive sensor that represents a first measured temperature compensated electrical property of said oil;

c. a profile of predicted temperature compensated electrical properties of said oil is obtained so that said first measured temperature compensated electrical property of said oil is compared with a first predicted temperature compensated electrical property of said oil according to a first actual usage of said oil from said profile of said predicted properties;

d. a first predicted remaining usage of said oil is determined according to said first actual usage of said oil, and a second measured temperature compensated electrical property of said oil is obtained according to said first actual usage of said oil from a second measurement to thereby obtain a second measured remaining usage of said oil;

e. a normal deterioration of said oil is determined which occurs in the absence of water if said second measured remaining usage is similar to said first predicated remaining usage, and said second measured remaining usage is confirmed to represent a remaining actual usage of said oil;

f. an abnormal deterioration of said oil is determined which occurs in the presence of water if said second measured remaining usage is less than said first predicated remaining usage; and

g. a top level of said oil is determined to reduce to a top level of a predetermined threshold amount of said oil if said second measured remaining usage is larger than said first predicted remaining usage.

12. The sensor as claimed in claim 11 at step b, wherein said electrical property is selected from the group consisting of impedance, resistance, reactance, phase angle, voltage and current.

13. The sensor as claimed in claim 11, further comprising spacers of insulating materials that are positioned between two adjacent plated electrodes, and said electrodes are affixed by additional insulating means to thereby keep a fixed gap between said two adjacent plated electrodes.

14. The sensor as claimed in claim 11, said sensing capacitive sensor further includes a total of an odd number of identical plated electrodes that are positioned equally spaced apart, in order, alignment and parallel with each other, wherein odd numbered plated electrodes of said total electrodes are connected in parallel by a first lead wire serving as a first electrical pole to thereby form a first group of integrated electrodes, and even numbered electrodes are connected in parallel by a second lead wire serving as a second electrical pole to thereby form a second group of integrated electrodes.

15. The sensor as claimed in claim 11, wherein said sensing capacitive sensor is positioned to align with said top level of said predetermined threshold amount of said oil of said machine, wherein said oil is a lubricating oil, and said machine is an internal combustion engine.

16. The sensor as claimed in claim 11, further comprising:

a. a normal deterioration of said oil is determined which occurs in the absence of water if said second measured temperature compensated electrical property of said oil is similar to said first predicated temperature compensated electrical property of said oil;

b. an abnormal deterioration of said oil is determined which occurs in the presence of water if said second measured temperature compensated electrical property of said oil is less than said first predicated temperature compensated electrical property of said oil; and

c. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured temperature compensated electrical property of said oil is larger than said first predicated temperature compensated electrical property of said oil.

17. The sensor as claimed in claim 11 at step d, further comprising:

a. a second measured remaining actual usage of said oil is Δ

U_M2=(U_S−

U_M2), wherein said U_M2 is a second measured actual usage of said oil which is corresponding with said second measured temperature compensated electrical property, said U_S is an actual usage of said oil which is spent;

b. a first predicted remaining actual usage of said oil is Δ

U_P=U_S−

U_P, wherein said U_P is a first predicted actual usage of said oil which is corresponding with said first predicted property;

c. a normal deterioration of said oil is determined which occurs in the absence of water if said second measured remaining actual usage Δ

U_M2 is similar to said first predicted remaining actual usage Δ

U_P, and confirming said second measured remaining actual usage;

d. an abnormal deterioration of said oil is determined which occurs in the presence of water if said second measured remaining actual usage Δ

U_M2 is less than said first predicted remaining actual usage Δ

U_P; and

e. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured remaining actual usage Δ

U_M2 is larger than said first predicted remaining actual usage Δ

U_P.

18. The sensor as claimed in claim 11 at step d, further comprising:

a. a second measured temperature compensated electrical property of said sensing capacitive sensor according to a second actual usage of said oil is obtained from a second measurement to thereby represent a second measured temperature compensated electrical property of said oil according to said second actual usage of said oil, from which further to obtain a second measured remaining usage ratio and second measured remaining usage of said oil according to said second actual usage of said oil, a second predicted temperature compensated electrical property of said oil is obtained from said profile of said predicted temperature compensated electrical properties according to said second actual usage of said oil, from which further to obtain a second predicted remaining usage ratio and second predicted remaining usage of said oil according to said second actual usage of said oil;

b. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured remaining usage of said oil is larger than said second predicted remaining usage of said oil;

c. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured temperature compensated electrical property differs from said second predicted temperature compensated electrical property wherein said difference indicates less deterioration of said oil than deterioration predicted by said second predicted temperature compensated electrical property;

d. a likely presence of water in said oil is determined if said first and second measured temperature compensated electrical properties of said oil according to the respective first and second actual usages of said oil have a rate of change of deterioration of said oil which differs from a rate of change of deterioration predicted by said first and second predicted temperature compensated electrical properties of said oil according to the respective first and second actual usages of said oil, wherein said difference indicates extra deterioration of said oil than deterioration predicted by said first and second predicted temperature compensated electrical properties;

e. a presence of water in said oil is determined if said second measured temperature compensated electrical property of said oil according to said second actual usage of said oil having a value which exceeds a predetermined extreme value of said predicted temperature compensated electrical property profile, wherein said predetermined extreme value is exceeded at said second actual usage which is earlier than an actual usage predicted by said predicted temperature compensated electrical property profile; and

f. a second calibration means for counting elapsed actual usages.

19. The sensor as claimed in claim 11 at step d, further comprising:

a. a second measured temperature compensated electrical property of said sensing capacitive sensor according to a second actual usage of said oil is obtained from a second measurement to thereby represent a second measured temperature compensated electrical property of said oil according to said second actual usage of said oil, from which further to obtain a second measured remaining actual usage of said oil, a second predicted temperature compensated electrical property of said oil is obtained from said profile of said predicted temperature compensated electrical properties according to said second actual usage of said oil, from which further to obtained a second predicted remaining actual usage of said oil;

b. a top level of said oil is determined to reduce to said top level of said predetermined threshold amount of said oil if said second measured remaining actual usage of said oil is larger than said second predicted remaining actual usage of said oil; and

c. a second calibration means for counting elapsed actual usages.

20. A sensor for detecting oil deterioration and oil level, comprising:

a. identical first and second measurement sensors comprising the respective identical first and second sensing capacitive sensors, wherein each of said sensing capacitive sensors includes left, middle and right identical upward plated electrodes having the respective top and bottom ends, which are positioned to be equally spaced apart in order, alignment and parallel with each other, wherein said top ends of the respective left and right electrodes are electrically connected in parallel by a first lead wire serving as a first electrical pole, said top end of said middle electrode is connected by a second lead wire serving as a second electrical pole, said first measurement sensor is positioned into a first location of an oil system of a machine wherein said first sensing capacitive sensor is immersed into a first oil that is dry and disposed into said first location of said oil system, said second measurement sensor is positioned into a second location of said oil system of said machine, wherein said second capacitive sensor is immersed into a second oil that is dry and disposed into said second location, said first oil and second oil are identical and have a same temperature;

b. a reference sensor comprising a referencing capacitive sensor that is identical to said first sensing capacitive sensor, said referencing capacitive sensor is immersed into a reference oil that is positioned inside of a sealed container of said reference sensor, said reference sensor is positioned in a common temperature environment with said first oil and second oil of said oil system

c. an alternating current (AC) analyzing device is connected to said referencing, first and second sensing capacitive sensors, wherein said AC analyzing device applies an AC voltage at a frequency to said sensors from a first measurement to thereby detect first measured electrical properties of the respective first sensing, second sensing and referencing capacitive sensors;

d. said first measured electrical properties of the respective first sensing and referencing capacitive sensors are combined to obtain a first measured temperature compensated electrical property of said first sensing capacitive sensor that represents a first measured temperature compensated electrical property of said first oil, said first measured electrical properties of the respective second sensing and referencing capacitive sensors are combined to obtain a first measured temperature compensated electrical property of said second sensing capacitive sensor that represents a first measured temperature compensated electrical property of said second oil;

e. a first predicted temperature compensated electrical property of said first oil is compared with said first measured temperature compensated electrical property of said first oil positioned in said first location from a profile of predicted temperature compensated electrical properties of said first oil to thereby determine a first predicted remaining usage of said first oil, which correlates to a first actual usage of said first oil from said profile of said predicted properties;

f. second measured temperature compensated electrical properties of the respective first oil and second oil positioned in the respective first and second locations are obtained according to said first actual usage of said first oil from a second measurement to thereby obtain second measured remaining usages of the respective first oil and second oil;

g. an even distribution of an oil normal deterioration is determined which occurs in the absence of water if said second measured remaining usages of the respective first oil and second oil are similar to said first predicated remaining usage of said first oil, and one of said second measured remaining usages is confirmed to represent an oil remaining actual usage; and

h. an uneven distribution of deterioration of the respective first oil and second oil is determined if said second measured remaining usages of the respective first oil and second oil are different from each other, as compared with said first predicated remaining usage of said first oil.

21. The sensor as claimed in claim 20 at step c, wherein said electrical property is selected from the group consisting of impedance, resistance, reactance, phase angle, voltage and current.

22. The sensor as claimed in claim 20, further comprising spacers of insulating materials that are positioned between two adjacent plated electrodes, and said electrodes are affixed by additional insulating means to thereby maintain a fixed gap between said two adjacent plated electrodes.

23. The sensor as claimed in claim 20, said first sensing capacitive sensor further includes a total of an odd number of identical plated electrodes that are positioned equally spaced apart, in order, alignment and parallel with each other, wherein odd numbered plated electrodes of said total electrodes are connected in parallel by a first lead wire serving as a first electrical pole to thereby form a first group of integrated electrodes, and even numbered electrodes are connected in parallel by a second lead wire serving as a second electrical pole to thereby form a second group of integrated electrodes.

24. The sensor as claimed in claim 20, wherein said reference oil is selected from the group consisting of an unused oil, a partially spent oil and spent oil, and said reference oil has a similar thermal property as compared with a thermal property of said first oil, and said first oil is a lubricating oil, and said machine is an internal combustion engine.