JPH0682408A - Oil deterioration degree evaluation method and its evaluation device - Google Patents
Oil deterioration degree evaluation method and its evaluation deviceInfo
- Publication number
- JPH0682408A JPH0682408A JP23559992A JP23559992A JPH0682408A JP H0682408 A JPH0682408 A JP H0682408A JP 23559992 A JP23559992 A JP 23559992A JP 23559992 A JP23559992 A JP 23559992A JP H0682408 A JPH0682408 A JP H0682408A
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- Japan
- Prior art keywords
- oil
- electrode
- electrodes
- deterioration
- charge transfer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
(57)【要約】
【目的】 対象オイルの劣化度を可及的に簡単な手段
で、しかも、オイル自体の性状変化などを齎らす惧れな
しに評価する。
【構成】 所定間隔で上下に対向して配置される１組の
上部，下部の各測定電極と、各測定電極間に接近して配
置される比較電極とからなる評価電極群を用い、当該評
価電極群を対象オイル中に浸漬させた後、下部の測定電
極に対して所要の正弦波電圧を印加させた状態で、下部
の電極のインピーダンス軌跡から、対象オイルにおける
電荷移動抵抗の値を算出し、当該電荷移動抵抗値によっ
て所期の対象オイルにおける劣化度を評価し得るように
する。
(57) [Summary] [Purpose] To evaluate the degree of deterioration of the target oil by the simplest method possible and without fear of causing a change in the properties of the oil itself. [Structure] The evaluation is performed by using an evaluation electrode group including a pair of upper and lower measurement electrodes that are vertically opposed to each other at a predetermined interval, and a reference electrode that is closely arranged between the measurement electrodes. After immersing the electrode group in the target oil, calculate the value of the charge transfer resistance in the target oil from the impedance locus of the lower electrode while applying the required sine wave voltage to the lower measurement electrode. , So that the degree of deterioration in the intended target oil can be evaluated by the charge transfer resistance value.
Description
【０００１】[0001]
【産業上の利用分野】この発明は、オイルの劣化度評価
方法，およびその評価装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating the degree of deterioration of oil and a device for evaluating the same.
【従来の技術】一般に、適当なオイル貯槽内に貯留され
て循環使用されるオイル，例えば、自動車に用いられる
エンジンオイルについては、その劣化が、単に、エンジ
ン自体の効率低下を招くだけではなく、当該自動車を効
率的に稼働させるための経済性についてまで大きく影響
することから、当該オイルの劣化度を常時，適正に判定
してメンテナンスする必要がある。従来、この種のオイ
ルにおける劣化度を評価するのには、通常の場合、対象
となるオイルをモニタリングして、その化学的性質，ま
たは電気的性質を試験して判断する手段がよく知られて
いる。すなわち、前者の化学的性質の試験については、
対象オイルを分析試験することで、その動粘度性，全酸
価の値，全アルカリ価の値，不溶解分の解析などの各点
から劣化度を評価し、また、後者の電気的性質の試験に
ついては、対象オイル中に浸漬される各測定電極間に所
要電圧を印加させることで、その誘電正接，所定体積で
の電気抵抗率，印加電圧に対する過渡的な応答電流値な
どの各点から劣化度を評価するようにしている。2. Description of the Related Art Generally, regarding oil that is stored in an appropriate oil storage tank and is circulated and used, for example, engine oil used for automobiles, deterioration thereof does not only cause a reduction in efficiency of the engine itself, Since the economical efficiency for efficiently operating the automobile is greatly affected, it is necessary to always properly judge and maintain the deterioration degree of the oil. Conventionally, in order to evaluate the deterioration degree of this kind of oil, a means for monitoring the oil of interest and testing and judging its chemical or electrical properties is usually well known. There is. That is, for the former chemistry test,
By subjecting the target oil to an analytical test, the degree of deterioration is evaluated from various points such as its kinematic viscosity, total acid value, total alkalinity value, insoluble matter analysis, and the like. For the test, by applying the required voltage between the measurement electrodes immersed in the target oil, the dielectric loss tangent, the electrical resistivity at a given volume, the transient response current value to the applied voltage, etc. The degree of deterioration is evaluated.
【発明が解決しようとする課題】しかしながら、前記の
ようにしてなされる従来でのオイルの劣化度評価手段に
おいては、次のような種々の問題点を生ずることにな
る。つまり、前者の化学的性質の試験によって評価する
場合には、対象オイルを分析するために、数多くの分析
機器類を必要とするために、比較的大がかりな手段にな
って好ましくないほか、その分析試験に際しては、比較
的長い時間を必要とし、併せて、分析操作自体について
も、極めて煩雑であるという不利を有している。また、
後者の電気的性質の試験によって評価する手段の場合に
あっては、対象オイル中に浸漬される各測定電極に対し
て、例えば、２５０Ｖ〜１０００Ｖ程度の比較的高い電
圧を印加させて行なうが、こゝでの高電圧印加による測
定においては、該当オイル自体の性状が徒らに変化して
了う（例えば、印加電圧によってオイルの分子がイオン
化されるなど）惧れがあり、このようなオイル自体の性
状変化，ひいては破壊を伴う試験手段は、劣化度評価の
ためのモニタリングとして必ずしも適当ではなく、この
場合にも前者と同様に、その測定操作に際して、比較的
長い時間と手数を必要とするという不都合があった。こ
の発明は、従来のこのような問題点を解消するためにな
されたもので、その目的とするところは、対象となるオ
イルの劣化度を可及的に簡単な手段により、しかも、対
象オイルの性状変化などを齎らす惧れなしに、所期通り
評価し得るようにした，この種のオイルの劣化度評価方
法，およびその評価装置を提供することである。However, the conventional means for evaluating the degree of deterioration of oil, which is made as described above, causes various problems as described below. In other words, in the case of evaluation by the former chemical property test, a large number of analytical instruments are required to analyze the target oil, which is not preferable as it is a relatively large-scale method. The test requires a relatively long time, and at the same time, the analysis operation itself is extremely complicated. Also,
In the case of the latter means of evaluating by electrical property test, a relatively high voltage of, for example, about 250 V to 1000 V is applied to each measurement electrode immersed in the target oil. In the measurement by applying a high voltage here, there is a possibility that the properties of the oil itself may change without any change (for example, the molecules of the oil are ionized by the applied voltage). A test means involving property change of itself and eventually destruction is not always suitable for monitoring for deterioration degree evaluation, and in this case as well as the former, relatively long time and labor are required for the measurement operation. There was an inconvenience. The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to reduce the degree of deterioration of a target oil by a means that is as simple as possible. It is an object of the present invention to provide a method for evaluating the degree of deterioration of oil of this kind, and an evaluation apparatus for the same, which enables evaluation as expected without fear of causing property changes.
【課題を解決するための手段】本発明者は、この種のオ
イルの劣化度を正確に評価するための新規な手法につ
き、長年に亘って種々検討を重ね、鋭意に開発努力を続
けた結果、オイルの使用時間，ひいては劣化度と、当該
オイルにおける電荷移動抵抗との間に密接な関係のある
ことを見出して、この発明を完成するに至った。図２に
は、オイルの使用時間と当該オイルにおける電荷移動抵
抗との関係を示してある。こゝでは、評価対象のオイル
中に浸漬した所定間隔による１組の対向する各測定電極
に対し、所要の比較的微弱な正弦波電圧を印加させると
共に、これらの各測定電極間に接近して比較電極を配置
させた状態において、この比較電極との間に得られるイ
ンピーダンス軌跡を示しており、この場合は、未使用の
エンジンオイルａと、通算１５４１時間に亘って使用し
たエンジンオイルｂと、通算２７３２時間に亘って使用
したエンジンオイルｃとのそれぞれにつき、当該インピ
ーダンスの実部と虚部とにプロットしたときの各インピ
ーダンス軌跡を表わしたもので、当該各インピーダンス
軌跡から明らかなように、対象オイルの劣化に伴う不溶
解成分，および水分などの増加によって、その電荷移動
抵抗の値が低下することが判る。すなわち、この発明に
係るオイルの劣化度評価方法は、所定間隔で上下に対向
して配置される１組の上部，下部の各測定電極と、当該
各測定電極間に接近して配置される比較電極とを用い、
評価対象としてのオイル中に、これらの各電極を浸漬さ
せると共に、前記比較電極に対し、１０ｋＨｚ〜１００
ｍＨｚ程度の範囲内で、ピーク値が１．８Ｖ程度の正弦
波電圧を下部の測定電極に印加させて、得られる下部の
測定電極のインピーダンス軌跡から、前記対象オイルに
おける電荷移動抵抗の値を算出し、前記電荷移動抵電荷
移動抵抗抗値によって劣化度評価をなすことを特徴とす
るものである。また、この発明に係るオイルの劣化度評
価装置は、所定間隔で上下に対向して配置される１組の
上部，下部の各測定電極，および当該各測定電極間に接
近して配置される比較電極からなり、評価対象のオイル
中に浸漬されて、比較電極に対し、１０ｋＨｚ〜１００
ｍＨｚ程度の範囲内で、ピーク値が１．８Ｖ程度の正弦
波電圧を下部の測定電極に印加させ得るようにした評価
電極群と、前記正弦波電圧の印加によって検出される下
部の測定電極のインピーダンス軌跡を測定する測定手段
と、当該測定されるインピーダンス軌跡から、前記対象
オイルにおける電荷移動抵抗の値を算出する演算手段と
を少なくとも備え、前記電荷移動抵抗値によって劣化度
評価をなすことを特徴とするものである。The present inventor has conducted various studies over many years on a novel method for accurately evaluating the degree of deterioration of this type of oil, and as a result of earnestly continuing the development efforts. The inventors have completed the present invention by finding that there is a close relationship between the use time of oil, the deterioration degree, and the charge transfer resistance of the oil. FIG. 2 shows the relationship between the oil usage time and the charge transfer resistance of the oil. Here, the required comparatively weak sinusoidal voltage is applied to each pair of opposing measurement electrodes immersed in the oil to be evaluated at a predetermined interval and close to each measurement electrode. In a state where the reference electrode is arranged, an impedance locus obtained between the reference electrode and the reference electrode is shown. In this case, an unused engine oil a, an engine oil b used for 1541 hours in total, and For each of the engine oil c used for a total of 2732 hours, each impedance locus when plotted in the real part and the imaginary part of the impedance is shown. As is clear from the impedance locus, It can be seen that the value of the charge transfer resistance decreases due to an increase in insoluble components, water content, etc. accompanying the deterioration of the oil. That is, the method for evaluating the degree of deterioration of oil according to the present invention includes a pair of upper and lower measurement electrodes that are vertically opposed to each other at a predetermined interval, and a comparison method that is arranged close to each measurement electrode. With electrodes,
Each of these electrodes was immersed in oil as an evaluation target, and 10 kHz to 100 kHz with respect to the reference electrode.
Within the range of about mHz, a sinusoidal voltage having a peak value of about 1.8 V is applied to the lower measurement electrode, and the value of the charge transfer resistance in the target oil is calculated from the obtained impedance locus of the lower measurement electrode. However, the deterioration degree is evaluated based on the resistance value of the charge transfer resistance. Further, the apparatus for evaluating the degree of deterioration of oil according to the present invention includes a pair of upper and lower measurement electrodes that are vertically opposed to each other at a predetermined interval, and a comparison unit that is arranged close to each of the measurement electrodes. It consists of an electrode and is immersed in the oil to be evaluated, and 10 kHz to 100 kHz for the reference electrode.
Within the range of about mHz, a sine wave voltage having a peak value of about 1.8 V can be applied to the lower measurement electrode, and a lower measurement electrode detected by the application of the sine wave voltage. At least a measuring means for measuring an impedance locus and a calculating means for calculating a value of a charge transfer resistance in the target oil from the measured impedance locus are provided, and the deterioration degree is evaluated by the charge transfer resistance value. It is what
【作用】従って、この発明では、１組の上部，下部の各
測定電極と各測定電極間に接近する比較電極とを対象オ
イル中に浸漬させた後、比較電極に対し、１０ｋＨｚ〜
１００ｍＨｚ程度の範囲内で、ピーク値が１．８Ｖ程度
の正弦波電圧を下部の測定電極に印加させることによ
り、下部の電極のインピーダンス軌跡を測定すると共
に、このようにして測定されるインピーダンス軌跡か
ら、こゝでの対象オイルにおける電荷移動抵抗の値を算
出できて、結果的に、所期のオイル劣化度を容易に評価
し得る。Therefore, in the present invention, a set of upper and lower measuring electrodes and a reference electrode which is close to each other between the measuring electrodes are immersed in the target oil, and then 10 kHz to
The impedance locus of the lower electrode is measured by applying a sinusoidal voltage having a peak value of about 1.8 V to the lower measurement electrode within a range of about 100 mHz, and from the impedance locus thus measured, The value of the charge transfer resistance in the target oil can be calculated here, and as a result, the desired oil deterioration degree can be easily evaluated.
【実施例】以下，この発明に係るオイルの劣化度評価方
法，およびその評価装置の実施例につき、図１および図
２を参照して詳細に説明する。図１は、この発明の一実
施例を適用した劣化度評価装置の概要を模式的に示す構
成説明図である。すなわち、この図１に示す実施例構成
において、符号１１は、この場合，適当なオイル貯槽Ａ
内に貯留されて循環使用する，こゝでの評価対象として
のオイルＢ中に浸漬して用いる評価電極群であり、所定
間隔（例えば、３ｍｍ程度）で上下に相対向して配置さ
れる１組の上部，下部の各測定電極１２ａ，１２ｂと、
当該各測定電極１２ａ，１２ｂ間に接近して配置される
比較電極１３とからなっている。こゝで、前記上部，下
部の各測定電極１２ａ，１２ｂと、比較電極１３との各
電極材料には、例えば、白金を用いるのが好ましいもの
であって、この場合，当該白金については、これが不溶
性であって、しかも、反応活性が比較的高いことから、
こゝでの電極材料として最適である。そして、前記下部
の測定電極１２ｂに対しては、１０ｋＨｚ〜１００ｍＨ
ｚ程度の範囲内で、ピーク値が１．８Ｖ程度の正弦波電
圧を印加させる。なお、前記各測定電極１２ａ，１２ｂ
のうち、一方の測定電極１２ａを上部に配置させてお
き、当該上部測定電極１２ａの対極となる他方の測定電
極１２ｂを所定間隔で下部に位置させたのは、この下部
測定電極１２ｂ上に対して、前記対象オイルＢ中におけ
る不溶解成分，ならびに水分などをトラップし易くする
ことにより、当該対象オイルの劣化度をより一層正確に
評価するためである。また、２１は、前記した下部の測
定電極１２ｂへ正弦波電圧を印加させるＡＣインピーダ
ンスメーター、２２は応答正弦波電流を検出測定する応
答正弦波電流測定回路であって、それぞれに測定手段を
構成しており、さらに、２３は、当該測定手段２１，２
２によって得たインピーダンス軌跡から、前記対象オイ
ルＢにおける電荷移動抵抗の値を算出する電荷移動抵抗
演算回路であって、演算手段を構成し、このようにして
算出された電荷移動抵抗値は、こゝでの対象オイルＢの
劣化度評価として適宜の表示回路２４上に表示される。
従って、この実施例装置の構成においては、評価電極群
１１としての，所定間隔で対向配置させた１組の上部，
下部の各測定電極１２ａ，１２ｂと、当該各測定電極１
２ａ，１２ｂ間に接近して配置させた比較電極１３との
それぞれを対象オイルＢ中に浸漬させておき、下部の測
定電極１２ｂに所要の正弦波電圧をＡＣインピーダンス
メーター２１により印加させ、また応答正弦波電流は応
答正弦波電流測定回路２２によって測定され、引続き、
このようにして測定されるインピーダンス軌跡から、電
荷移動抵抗演算回路２３により、対象オイルＢでの電荷
移動抵抗の値を効率的かつ正確に演算して算出できると
共に、算出された電荷移動抵抗値を表示回路２４上に表
示させて、先に図２で述べたように、当該電荷移動抵抗
値によって対象オイルＢの劣化度を正しく評価し得るの
である。Embodiments of the method for evaluating the degree of deterioration of oil according to the present invention and an apparatus for evaluating the same will be described below in detail with reference to FIGS. FIG. 1 is a configuration explanatory view schematically showing an outline of a deterioration degree evaluation apparatus to which an embodiment of the present invention is applied. That is, in the configuration of the embodiment shown in FIG. 1, reference numeral 11 indicates a suitable oil storage tank A in this case.
It is an evaluation electrode group which is used by being immersed in oil B, which is stored and circulated and used as an object of evaluation in this case, and which are vertically opposed to each other at a predetermined interval (for example, about 3 mm). The upper and lower measuring electrodes 12a and 12b of the set,
The measurement electrode 12a and the reference electrode 13 are arranged close to each other between the measurement electrodes 12b. Here, it is preferable to use, for example, platinum for each electrode material of the upper and lower measurement electrodes 12a and 12b and the comparison electrode 13, and in this case, for the platinum, this is Since it is insoluble and its reaction activity is relatively high,
Most suitable as an electrode material here. Then, for the lower measurement electrode 12b, 10 kHz to 100 mH
A sine wave voltage having a peak value of about 1.8 V is applied within a range of about z. In addition, each of the measurement electrodes 12a and 12b
One of the measurement electrodes 12a is placed on the upper side, and the other measurement electrode 12b, which is a counter electrode of the upper measurement electrode 12a, is placed on the lower side at a predetermined interval. By facilitating trapping of insoluble components and water in the target oil B, the degree of deterioration of the target oil B can be evaluated more accurately. Further, 21 is an AC impedance meter for applying a sine wave voltage to the lower measurement electrode 12b, and 22 is a response sine wave current measuring circuit for detecting and measuring a response sine wave current, each of which constitutes a measuring means. Further, 23 is the measuring means 21, 2 concerned.
2 is a charge transfer resistance calculating circuit for calculating the value of the charge transfer resistance in the target oil B from the impedance locus obtained in step 2, and the charge transfer resistance value thus calculated is It is displayed on the appropriate display circuit 24 as the evaluation of the deterioration degree of the target oil B in step (a).
Therefore, in the configuration of the apparatus of this embodiment, a pair of upper parts as the evaluation electrode group 11 which are opposed to each other at a predetermined interval,
The lower measuring electrodes 12a and 12b and the respective measuring electrodes 1
Each of the reference electrodes 13 arranged close to each other between 2a and 12b is immersed in the target oil B, and a required sine wave voltage is applied to the lower measurement electrode 12b by the AC impedance meter 21. The sinusoidal current is measured by the response sinusoidal current measuring circuit 22, and
From the impedance locus thus measured, the value of the charge transfer resistance in the target oil B can be efficiently and accurately calculated by the charge transfer resistance calculation circuit 23, and the calculated charge transfer resistance value can be calculated. The deterioration degree of the target oil B can be correctly evaluated by displaying it on the display circuit 24 and using the charge transfer resistance value as described above with reference to FIG.
【発明の効果】以上、実施例によって詳述したように、
この発明によれば、所定間隔で配置された１組の上部，
下部の各測定電極と、これらの各測定電極間に接近して
配置された比較電極とによる評価電極群を用い、当該評
価電極群を対象オイル中に浸漬させた上で、下部の測定
電極に対して所要の正弦波電圧を印加させることによ
り、下部の電極のインピーダンス軌跡を測定し、かつこ
のようにして測定されるインピーダンス軌跡から、こゝ
での対象オイルにおける電荷移動抵抗の値を算出するよ
うにしたから、当該電荷移動抵抗値によって所期の対象
オイルにおける劣化度を、非破壊の基で、極めて迅速か
つ正確に評価し得るもので、この結果，対象オイルの効
率的なメンテナンスが可能になり、しかも、装置自体の
構成も比較的簡単で容易に実施できるなどの優れた特長
がある。As described above in detail with reference to the embodiments,
According to this invention, a pair of upper parts arranged at a predetermined interval,
Using the evaluation electrode group by each measurement electrode of the lower part and the reference electrode arranged close to each of these measurement electrodes, after immersing the evaluation electrode group in the target oil, the measurement electrode of the lower part The impedance locus of the lower electrode is measured by applying the required sinusoidal voltage to it, and the value of the charge transfer resistance in the target oil is calculated from the impedance locus thus measured. Therefore, it is possible to evaluate the degree of deterioration of the target oil by the charge transfer resistance value very quickly and accurately on a non-destructive basis. As a result, efficient maintenance of the target oil is possible. In addition, the device itself has a relatively simple structure and can be easily implemented.
【図１】この発明のオイルの劣化度評価装置の概要を模
式的に示す構成説明図である。FIG. 1 is a configuration explanatory view schematically showing an outline of an oil deterioration evaluation apparatus of the present invention.
【図２】この発明におけるオイルの使用時間と当該オイ
ルにおける電荷移動抵抗との関係を示すグラフである。FIG. 2 is a graph showing the relationship between the oil usage time and the charge transfer resistance of the oil according to the present invention.
１１ 評価電極群 １２ａ 上部測定電極 １２ｂ 下部測定電極 １３ 比較電極 ２１ ＡＣインピーダンスメーター（測定手段） ２２ 応答正弦波電流測定回路（測定手段） ２３ 電荷移動抵抗演算回路（演算手段） ２４ 表示回路 Ａ オイル貯槽 Ｂ 測定対象のオイル 11 Evaluation Electrode Group 12a Upper Measurement Electrode 12b Lower Measurement Electrode 13 Reference Electrode 21 AC Impedance Meter (Measurement Means) 22 Response Sine Wave Current Measurement Circuit (Measurement Means) 23 Charge Transfer Resistance Calculation Circuit (Calculation Means) 24 Display Circuit A Oil Tank B Oil to be measured
Claims (3)
組の上部，下部の各測定電極と、当該各測定電極間に接
近して配置される比較電極とを用い、 評価対象としてのオイル中に、これらの各電極を浸漬さ
せると共に、前記比較電極に対し、１０ｋＨｚ〜１００
ｍＨｚ程度の範囲内で、ピーク値が１．８Ｖ程度の正弦
波電圧を下部の測定電極に印加させて、得られるインピ
ーダンス軌跡から、前記対象オイルにおける電荷移動抵
抗の値を算出し、 前記電荷移動抵抗値によって劣化度評価をなすことを特
徴とするオイルの劣化度評価方法。1. A device 1 which is vertically opposed to another at a predetermined interval.
Using the upper and lower measurement electrodes of the set and the reference electrodes placed close to each other, the electrodes are immersed in the oil to be evaluated and the reference electrodes are On the other hand, 10 kHz to 100
Within a range of about mHz, a sinusoidal voltage having a peak value of about 1.8 V is applied to the lower measurement electrode, and the value of the charge transfer resistance in the target oil is calculated from the obtained impedance locus, A method for evaluating the deterioration degree of oil, characterized in that the deterioration degree is evaluated by the resistance value.
組の上部，下部の各測定電極，および当該各測定電極間
に接近して配置される比較電極からなり、評価対象のオ
イル中に浸漬されて、比較電極に対し、１０ｋＨｚ〜１
００ｍＨｚ程度の範囲内で、ピーク値が１．８Ｖ程度の
正弦波電圧を下部の測定電極に印加させ得るようにした
評価電極群と、 前記正弦波電圧の印加によって検出される下部の測定電
極のインピーダンス軌跡を測定する測定手段と、 当該測定されるインピーダンス軌跡から、前記対象オイ
ルにおける電荷移動抵抗の値を算出する演算手段とを少
なくとも備え、 前記電荷移動抵抗値によって劣化度評価をなすことを特
徴とするオイルの劣化度評価装置。2. A unit 1 which is vertically opposed to each other at a predetermined interval.
It consists of the upper and lower measuring electrodes of the set, and the reference electrodes that are arranged close to each other, and is immersed in the oil to be evaluated, and 10 kHz to 1
In a range of about 00 mHz, a group of evaluation electrodes that allows a sine wave voltage having a peak value of about 1.8 V to be applied to the lower measurement electrode, and a lower measurement electrode detected by the application of the sine wave voltage. At least a measuring unit for measuring an impedance locus and a calculating unit for calculating a value of a charge transfer resistance in the target oil from the measured impedance locus are provided, and the deterioration degree is evaluated by the charge transfer resistance value. Equipment for evaluating the degree of deterioration of oil.
金電極であることを特徴とする請求項２に記載のオイル
の劣化度評価装置。3. The oil deterioration degree evaluation device according to claim 2, wherein each of the measurement electrodes and the comparison electrode is a platinum electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23559992A JPH0682408A (en) | 1992-09-03 | 1992-09-03 | Oil deterioration degree evaluation method and its evaluation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23559992A JPH0682408A (en) | 1992-09-03 | 1992-09-03 | Oil deterioration degree evaluation method and its evaluation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0682408A true JPH0682408A (en) | 1994-03-22 |
Family
ID=16988396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23559992A Pending JPH0682408A (en) | 1992-09-03 | 1992-09-03 | Oil deterioration degree evaluation method and its evaluation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0682408A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6861851B2 (en) | 2002-10-16 | 2005-03-01 | The Lubrizol Corporation | Method for on-line monitoring of quality and condition of non-aqueous fluids |
| US7259575B2 (en) | 2005-04-08 | 2007-08-21 | The Lubrizol Corporation | Method for on-line fuel-dilution monitoring of engine lubricant |
| US7355415B2 (en) | 2004-05-07 | 2008-04-08 | The Lubrizol Corporation | Method for on-line monitoring of condition of non-aqueous fluids |
| JP2023058374A (en) * | 2021-10-13 | 2023-04-25 | 三菱重工業株式会社 | Oil deterioration detection device, oil deterioration detection system and oil deterioration detection method |
-
1992
- 1992-09-03 JP JP23559992A patent/JPH0682408A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6861851B2 (en) | 2002-10-16 | 2005-03-01 | The Lubrizol Corporation | Method for on-line monitoring of quality and condition of non-aqueous fluids |
| US7355415B2 (en) | 2004-05-07 | 2008-04-08 | The Lubrizol Corporation | Method for on-line monitoring of condition of non-aqueous fluids |
| US7259575B2 (en) | 2005-04-08 | 2007-08-21 | The Lubrizol Corporation | Method for on-line fuel-dilution monitoring of engine lubricant |
| JP2023058374A (en) * | 2021-10-13 | 2023-04-25 | 三菱重工業株式会社 | Oil deterioration detection device, oil deterioration detection system and oil deterioration detection method |
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