JP3074487B2 - Lubricating oil deterioration detection device and detection method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for detecting deterioration of lubricating oil in a vehicle engine, transmission and the like.

[0002]

2. Description of the Related Art Conventionally, as a method for judging the deterioration of lubricating oil of a vehicle engine or transmission or bearing lubrication oil of a turbine generator, a hydroelectric generator or the like, J.
It is common to use criteria based on IS or ASTM standards, for example, total base number, total acid value, insoluble matter, additive reduction, viscosity, and the like. In recent years, detection devices suitable for each criterion have been proposed. Among them, Japanese Patent Application Laid-Open No. Sho 61-96262 discloses a device relating to viscosity, and Japanese Patent Application Laid-Open No. 59-12129 relates to total acid value.
No. 7 is known.

[0003]

However, according to the criterion according to the above-mentioned conventional JIS and ASTM standards, a dedicated measuring device and specialized knowledge are required for the measurement.
The viscosity disclosed in Japanese Patent Application Laid-Open No. 61-96262 is not general because the oil film of the bearing is measured and the viscosity is determined from the measured value. Also, the total acid value of JP-A-59-12
The method disclosed in Japanese Patent Publication No. 1297 is composed of precise weighing of lubricating oil, dilution of a solvent, titration with a base, and the like, and has a problem that it is very complicated and takes a long time.
Further, when the lubricating oil is sampled, the lubricating oil must be replenished, and it is very difficult to use it in practical use. In particular, when mounted on a vehicle or the like, the device is small and needs to be measured in real time. However, at present, there is a problem that any device that can be mounted cannot measure easily, quickly, and inexpensively. .

In view of the above, the present invention provides a lubricating oil deterioration detecting device capable of measuring the deterioration of the lubricating oil in real time, having a small size and capable of being mounted on a vehicle, and a method of detecting the same. It is intended for.

[0005]

In order to achieve the above object, a first aspect of the present invention is to provide a lubricating oil having a pair of electrodes immersed in lubricating oil and a voltage generated between the two electrodes. It comprises a calculation unit for calculating the degree of deterioration based on the total acid value map of the oil and a display unit for displaying the result. An inert metal is used for at least one of the pair of electrodes 2 and 3. According to a second aspect , in the first aspect , any of gold, silver, and platinum is used as the inert metal. Third
According to the invention of the first aspect , in the first aspect, at least one of iridium, ruthenium, rhodium or an oxide thereof is used for the other electrode. The fourth invention is a lubricating oil 2
A pair of electrodes 2 and 3 immersed in 1 and both electrodes 2 and 3
From the applied voltage, the total acid value of the lubricating oil
Calculation unit 7 for calculating the degree of deterioration in light of the
And a display unit 8 for displaying, and the combination as a metal used for the pair of electrodes 2 and 3 is (1) rhodium-lead, (2)
Platinum-indium, (3) rhodium-indium,
(4) iridium-indium, (5) lead-indium, (6) platinum-nickel, (7) rhodium-zinc,
(8) platinum-copper, (9) rhodium-copper, (10) iridium-copper, (11) lead-copper, (12) platinum-silver, (1)
3) rhodium-silver, (14) iridium-silver, (15)
Any combination of lead-silver and (16) iridium-zinc is used.

[0006]

[Operation] By immersing two electrodes in lubricating oil,
A voltage corresponding to the degree of deterioration of the lubricating oil is taken out from both electrodes, and the deterioration of the lubricating oil is determined based on this voltage.

[0007]

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing one embodiment of a lubricating oil deterioration detection device of the present invention, and FIG. 2 is a circuit diagram. In FIG.
The lubricating oil deterioration detection device 1 is mounted on an engine 20 mounted on a vehicle (not shown), and measures deterioration of a lubricating oil 21 (hereinafter, referred to as oil 21) for lubricating the engine 20. The lubricating oil deterioration detecting device 1 includes a pair of electrodes 2 in contact with the oil to be measured.
3, a current amplifier 4 connected to the pair of electrodes 2 and 3,
A voltage measuring device 5 connected to the current amplifier 4, a calculating unit 7 connected to the voltage measuring device 5 and a temperature detecting unit 6 in contact with the oil to be measured, and a display device 8 for displaying the result of the calculating unit 7. It is configured. FIG. 2 is a circuit diagram, using a working amplifier circuit. Differential gain can be varied by one resistor R _1, to adjust the amplification value V _1, V _2. Also,
The output can be adjusted by a variable resistor R ₃ (M) depending on the type of oil and the like. In the above, a pair of electrodes 2 and 3
The voltage V caused by immersion in the oil 21 for measuring
₁ and V ₂ are led to the current amplifier 4 and the voltage V ₀ is measured.
This voltage V ₀ is led to the arithmetic unit 7, which calculates the voltage V ₀
The signal from the temperature detector 6 is applied to ₀ to perform temperature correction. For this purpose, for example, a temperature-voltage map is used because of the temperature characteristics shown in FIG. FIG. 3 is a total acid value map showing a change in the voltage detected by the lubricant deterioration detecting device 1 with respect to a change in the total acid value of oil known in advance. The voltage obtained by the detection is compared with the total acid value map. The total acid value of the oil at that time is determined and displayed on the display unit 8. In the above, for example, iridium oxide (1 mm square) is used for the electrode 2 and silver (1 mm circle) is used for the other electrode 3.
immersed in oil with a length of 5 mm, and compared the measured voltage with the analytical value measured by the titration method in accordance with JIS.
-E). This result has a correlation as shown in FIG. 3 and can be determined by measuring a predetermined value of the total acid value. In the above embodiment, iridium oxide and silver were used for the electrodes, but iridium, ruthenium, rhodium or an oxide thereof was used for one electrode, and the other electrode was used for the other electrode.
An inert metal such as gold or platinum may be used. Note that FIG.
The vertical axis represents voltage (V), and the horizontal axis represents total acid value (mg. KO).
H / g). In FIG. 4, the vertical axis represents the voltage (m
V), and the horizontal axis indicates temperature (° C.).

Further, the following combinations of metals can be used for the electrode pairs. That is, (1) rhodium-
Lead, (2) platinum-indium, (3) rhodium-indium, (4) iridium-indium, (5) lead-indium, (6) platinum-nickel, (7) platinum-zinc,
(8) rhodium-zinc, (9) platinum-copper, (10) rhodium-copper, (11) iridium-copper, (12) lead-copper,
(13) platinum-silver, (14) rhodium-silver, (15) iridium-silver, (16) lead-silver, (17) iridium-
Any combination of zinc.

The following is a total acid number map for a number of different metal pair combinations, including electrode pairs. In addition, each total acid value map is obtained by using seven types of known lubricating oils having total acid values shown in Table 1, obtaining respective detection voltages (mv), and plotting them on a graph. What changes linearly with each lubricating oil is preferable as an electrode pair.

[0010]

[Table 1]

In Table 1, the first is fresh oil and the seventh is the most deteriorated oil.

FIG. 5 shows a combination of platinum and copper.
The detection voltage (mv) in each sample is 186, 175, 147, 115, 98, 58, 9 in order from the first.
8 and changed linearly.

FIG. 6 shows a combination of gold and copper, and the detection voltages (mv) in the respective materials are 90, 47, 69, 93, 84, 78 and 53 in order from the first, and are linear. Did not change.

FIG. 7 shows a combination of rhodium and copper, and the detection voltage (mv) in each sample is 1
428, 277, 263, 250, 25
3, 203, 261 and changed substantially linearly.

FIG. 8 shows a combination of iridium-copper, and the detection voltages (mv) in these materials are 330, 265, 260, 214, 197,
−, 125, indicating that good linearity was obtained.

FIG. 9 shows a combination of 10 radium-copper, and the detection voltage (mv) in each sample is -894, -958, -950, -977,
−993, −1086, −1024, (1046), and linearity was obtained.

FIG. 10 shows a combination of platinum and zinc, and the detection voltages (mv) in these materials are 730, 566, 535, 504, 506, 50
3,533, (456), and substantially linearity was obtained.

FIG. 11 shows a gold-zinc combination.
The detection voltage (mv) in each material is 539, 454, 453, 497, 445, 49 in order from the first.
4,439, and no linearity was obtained.

FIG. 12 shows a combination of rhodium and zinc, and the detection voltage (mv) in each sample is 757, 623, 634, 587, 566, 6
09,576, (537), and substantially linearity was obtained.

FIG. 13 shows a combination of iridium-zinc, and the detection voltages (mv) in these materials are 498 (552), 516, 506, and 48 in order from the first.
0,482,446,439, (452), indicating that linearity was obtained.

FIG. 14 shows a combination of palladium-zinc, and the detection voltage (mv) in each sample is -648, (-624), -618, -62 in order from the first.
5, −635, −653, −683, −670, (−6
63), and no linearity was obtained.

FIG. 15 shows a combination of platinum and nickel. The detection voltage (mv) in each sample is 346, 260, 260, 230, 241, and 2 in order from the first.
27, 230, (243), and linearity was obtained.

FIG. 16 shows a combination of gold and nickel, and the detection voltage (mv) in each sample is 152, 114, 131, 154, 170, 1 in order from the first.
90 and 130, and no linearity was obtained.

FIG. 17 shows a combination of rhodium and nickel. The detection voltage (mv) in each sample is 335, 305, 307, 304, 30 in order from the first.
3,304,276, indicating that no change was detected in the detection voltage despite the change in the total acid value.

FIG. 18 shows a combination of iridium and nickel, and the detection voltage (mv) in each sample is 1
278, 264, 260, 262, 27
8, 254, 264, and there was no change in the detected voltage.

FIG. 19 shows a combination of palladium and nickel. The detection voltage (mv) in each sample is -848, -936, -913, -8 in order from the first.
85, -882, -888, -913, and no linearity was obtained.

FIG. 20 shows a combination of platinum and indium. The detection voltage (mv) in each sample is 643, 572, 568, 509, 479,
418, 422, indicating that linearity was obtained.

FIG. 21 shows a combination of gold and indium, and the detection voltages (mv) in these materials are 476, 447, 451, 422, 417, 4 in order from the first.
22,415, and there was no change in the detection voltage.

FIG. 22 shows a combination of rhodium and indium, and the detection voltages (mv) in these materials are 679, 628, 620, 575, 5
69, 501, and 512, indicating that linearity was obtained.

FIG. 23 shows a combination of iridium and indium, and the detected voltages (mv) in these materials are 538, (612), 547, and 52 in order from the first.
7,484, 460, 424, 413, indicating that linearity was obtained.

FIG. 24 shows a combination of lead and indium, and the detection voltage (mv) in each sample is -47, -524, -562, -598,-
641, -690, and -612, and substantially linearity was obtained.

FIG. 25 shows a combination of platinum and lead, and the detection voltages (mv) in these materials are 537, 415, 446, 426, 411 and 41 in order from the first.
7,430 (443), and no linearity was obtained.

FIG. 26 shows a combination of gold and lead, and the detection voltage (mv) in each sample is in the order from the first.
376,315,347,351,348,395,3
77, and there was no change in the detection voltage.

FIG. 27 shows a combination of rhodium and lead, and the detected voltages (mv) in these materials are 616, 520, 532, 495, 482, and 48 in order from the first.
4,503, substantially linearity was obtained.

FIG. 28 shows a combination of iridium and lead, and the detection voltage (mv) in each sample is 477,438,440,443,432,
414, 432, and the change in the detection voltage was small.

FIG. 29 shows a combination of palladium and lead. The detection voltage (mv) in each sample is -625, -665, -663, -690,-
665, -712, and -682, and there was little change in the detection voltage.

FIG. 30 shows a combination of platinum and silver.
The detection voltage (mv) in each material is 520, 404, 407, 360, 308, 25
0,322, (274), indicating that linearity was obtained.

FIG. 31 shows a combination of gold and silver, and the detection voltage (mv) in each material is as follows.
330,-, 263,230,221,228,23
0, (197), and no linearity was obtained.

FIG. 32 shows a combination of rhodium and silver. The detection voltage (mv) in each sample is 546, 462, 445, 406, 370, 3
00, 378, (315), and linearity was obtained.

FIG. 33 shows a combination of iridium and silver, and the detection voltages (mv) in these materials are 460, 425, 448, 372, 367, and 3 in order from the first.
27,302, and good linearity was obtained.

FIG. 34 shows a combination of palladium and silver, and the detection voltage (mv) in each sample is -647, -703, -720, -749,-
776, -726, -796, and linearity was obtained.

FIG. 35 shows a combination of iridium and iron, and the detected voltages (mv) in each sample are 494, 431, 422, 418, 412, and 412 in order from the first.
420 and 490, and the change in the detection voltage was not regular.

FIG. 36 shows a combination of iridium and aluminum.
Are, in order from the first, 985, 1025, 1025, 10
06, 1005, 1020, and 1014, and there was no change in the detection voltage.

FIG. 37 shows a combination of iridium and magnesium.
Are 1113, 1033, 1048, 1 in order from the first
109, 1075, 1037, and 1030, and the detection voltage was not regular.

When a combination of electrode pairs in which the change in the detection voltage changes at a constant rate due to the change in the total oxidation is selected from the above experiments, the combinations are (1) rhodium-lead, (2) platinum-
Indium, (3) rhodium-iridium, (4) iridium-indium, (5) lead-indium, (6) platinum-nickel, (7) rhodium-zinc, (8) platinum-
Copper, (9) rhodium-copper, (10) iridium-copper,
(11) lead-copper, (12) platinum-silver, (13) rhodium-silver, (14) iridium-silver, (15) lead-silver, (1)
6) It was found that an electrode pair of iridium-zinc combination could be used.

[0046]

As described above, according to the present invention,
By measuring the voltage generated by immersing the two electrodes in the oil to be measured, the deterioration of the oil can be determined. The features at this time are as follows: (a) Since a metal inert to acid corrosion is used, corrosion of the electrode is avoided and the electrode can be used for a long time. (B) Since a hydrogen electrode, a sweet and humid electrode, a silver-silver chloride electrode, etc., which are commonly used as a reference electrode, are not used, replenishment of an internal solution, gas and the like is not required, and long-term use is possible. (C) The internal liquid of these reference electrodes is water and cannot be used in a high-temperature place such as an engine. However, since only metal electrodes are used, they can be used at a high temperature and can be directly attached to an engine or the like. (D) When the fluid is directly attached to the lubricating oil flow path of the engine or the like, the pressure of the fluid is applied to the electrodes. However, in this case, since the metal electrode is used without using the comparative electrode, the fluid can be directly attached. The effect as described above occurs and the device can be reduced in size, real-time measurement is possible, and the result is displayed on the display device.
An excellent effect that anyone can measure easily, quickly, and inexpensively is obtained.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of a lubricating oil deterioration detection device of the present invention.

FIG. 2 is a circuit diagram.

FIG. 3 is a diagram showing a voltage measured by the apparatus of the present invention and an analysis value measured by a titration method according to JIS.

FIG. 4 is a diagram showing a relationship between temperature and voltage.

FIG. 5 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is platinum-copper.

FIG. 6 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is gold-copper.

FIG. 7 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is rhodium-copper.

FIG. 8 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is iridium-copper.

FIG. 9 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is palladium-copper.

FIG. 10 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is platinum-zinc.

FIG. 11 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is gold-zinc.

FIG. 12 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is rhodium-zinc.

FIG. 13 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is iridium-zinc.

FIG. 14 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is palladium-zinc.

FIG. 15 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is platinum-nickel.

FIG. 16 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is gold-nickel.

FIG. 17 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is rhodium-nickel.

FIG. 18 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is iridium-nickel.

FIG. 19 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is palladium-nickel.

FIG. 20 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is platinum-indium.

FIG. 21 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is gold-indium.

FIG. 22 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is rhodium-indium.

FIG. 23 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is iridium-indium.

FIG. 24 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is palladium-indium.

FIG. 25 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is platinum-lead.

FIG. 26 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is gold-lead.

FIG. 27 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is rhodium-lead.

FIG. 28 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is indium-lead.

FIG. 29 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is palladium-lead.

FIG. 30 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is platinum-silver.

FIG. 31 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is gold-silver.

FIG. 32 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is rhodium-silver.

FIG. 33 is a diagram showing a change in detection voltage in a material having a different total acid value when the material combination of the electrode pair is iridium-silver.

FIG. 34 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is palladium-silver.

FIG. 35 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is iridium-iron.

FIG. 36 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is indium-aluminum.

FIG. 37 is a diagram showing a change in detected voltage in a material having a different total acid value when the material combination of the electrode pair is iridium-magnesium.

[Explanation of symbols]

1 Lubricating oil deterioration detection device, 2 and 3 are electrodes, 4 current amplifier, 5 voltage amplifier, 6 temperature detector, 7 arithmetic unit, 8
Display device, 20 engine, 21 lubricating oil.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kunihiro Yamazaki 1200 Manda, Hiratsuka-shi, Kanagawa Pref. Laboratory in Komatsu Manufacturing Co., Ltd. (56) References JP-A-61-20851 (JP, A) , A) JP-A-57-192851 (JP, A) JP-A-61-255206 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 27/416 F01M 11/10 F16N 29/00 G01N 27/06 JICST file (JOIS)

Claims (4)

(57) [Claims] 1. A pair of electrodes 2 and 3 immersed in a lubricating oil 21;
An arithmetic unit 7 for calculating the degree of deterioration from the voltages generated at the two electrodes 2 and 3 with reference to a previously known total acid value map of the lubricating oil, and a display unit 8 for displaying the result ,
Inactive on at least one of the pair of electrodes 2 and 3
A lubricating oil deterioration detection device characterized by using a conductive metal . 2. The lubricating oil deterioration detecting device according to claim 1, wherein one of gold, silver and platinum is used as the inert metal. 3. The other electrode is composed of iridium, ruthenium,
Rhodium or claim (1) lubricant deterioration detecting device, wherein the using at least one of its oxides. 4. A pair of electrodes 2 and 3 immersed in lubricating oil 21;
From the voltage generated at these two electrodes 2 and 3,
Deterioration is calculated based on the total acid number map of the lubricating oil
It comprises an operation unit 7 and a display unit 8 for displaying the result,
The combination as the metal used for the pair of electrodes 2 and 3 is
(1) rhodium-lead, (2) platinum-indium, (3)
Rhodium-indium, (4) iridium-indium, (5) lead-indium, (6) platinum-nickel,
(7) rhodium-zinc, (8) platinum-copper, (9) rhodium-copper, (10) iridium-copper, (11) lead-copper,
(12) platinum-silver, (13) rhodium-silver, (14) iridium-silver, (15) lead-silver, (16) iridium-
A lubricating oil deterioration detection device characterized by using any combination of zinc.