JP7055063B2 - Oil management system - Google Patents

Description

The present invention is an oil management system for managing oil provided in an oil storage unit, and in particular, a temperature measuring means for measuring the temperature of the oil in the oil storage unit and resistance measurement for measuring the electrical resistance of the oil. It relates to an oil management system including means and control means.

As an oil management system of this type, for example, in Patent Document 1, a deterioration sensor is provided in an oil pan provided in a gas engine, and when the deterioration level detected by the deterioration sensor exceeds a predetermined value, the inside of the oil pan is contained. It describes how to dispose of oil and replenish it from a new oil tank.

By the way, it is difficult to automatically change and replenish oil for gas engines used in commercial air conditioning systems, etc., where it is not realistic to equip a tank for storing new oil. , The manager needs to visit the site to replenish and replace the oil in the oil storage area, and it is necessary to carry out planned maintenance to reduce the burden on the manager.

Therefore, the applicant of the present application proposes the oil management system described in Patent Document 2 as being capable of performing planned maintenance. The oil management system is an oil management system that uses a deterioration sensor and a management device that detect the degree of deterioration of oil provided in the oil storage section, and when the cumulative operating time of the equipment reaches a predetermined maintenance time. Based on the detection result of the deterioration sensor, it is determined whether to select oil replacement, oil replenishment, or no oil replacement / non-replenishment as a response to the oil storage unit, and based on the judgment result, oil storage is performed. It is configured to generate maintenance information regarding the response to the department.

Japanese Unexamined Patent Publication No. 5-107182 Japanese Unexamined Patent Publication No. 2017-172439

According to the oil management system described in Patent Document 2, it is possible to determine which of the above measures should be selected as the response to the oil storage portion only by using the deterioration sensor. Therefore, it is planned only by using the deterioration sensor. Appropriate maintenance can be performed.

By the way, in order to reduce the amount of waste oil from the environmental point of view and the maintenance cost from the economic point of view, it is important to carry out appropriate maintenance systematically without unnecessary oil replacement and replenishment as much as possible. Therefore, it is extremely important to accurately grasp the deterioration of oil. In addition, if the manager can know the approximate remaining operating time until the oil needs to be changed or replenished, it is extremely useful from the viewpoint of systematic maintenance. However, in the oil management system described in Patent Document 2, it is possible to grasp the deterioration of the oil and determine which of the above measures should be selected as the response to the oil storage portion, but the oil change or the oil replenishment is performed. It is not possible for the administrator to recognize the remaining operating time until it is required, in other words, the estimated deterioration limit time when oil change or the like is required.

The present invention has been made in view of the above circumstances, and it is possible to accurately determine whether or not oil replacement or oil replenishment is necessary, and the estimated deterioration limit time at which oil replacement or oil replenishment is required. The purpose is to provide an oil management system that can estimate and perform appropriate maintenance in a planned manner.

The characteristic configuration of the oil management system according to the present invention for achieving the above object is a temperature measuring means for measuring the temperature of the oil in the oil reservoir and a temperature measuring means.
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time at which the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance .
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit .
The storage unit has a change characteristic defined for each specific temperature, and when the device is operated under the predetermined conditions for the deterioration limit time, the electric resistance of the oil is the deterioration limit electric resistance. The change characteristics in which the relationship between the electrical resistance and the operating time of the device when the temperature changes to the above are specified in advance are stored.
The deterioration limit scheduled time estimation unit is
When the maintenance work determination unit determines that it is not necessary to replace the oil or replenish the oil, the operating time of the device corresponding to the measured electrical resistance of the resistance measuring means with reference to the change characteristic. Extracted,
Based on the extracted operation time, the actual operation time based on the time information at the time of resistance measurement by the resistance measuring means, and the deterioration limit time, the estimated deterioration limit time is estimated using the following mathematical formula 1. And formula 1 is
he _e = h (ha a _/ h _b ) (1)
_He is the planned deterioration limit time, h is the deterioration limit time, ha _is the actual operation time, and h b _is the extracted operation time .

In the above characteristic configuration, utilizing the point that the electric resistance decreases when the oil deteriorates, the deterioration limit scheduled time estimation unit uses the time when the electric resistance measured by the resistance measuring means becomes equal to or less than the deterioration limit electric resistance, that is, the oil. Estimate the estimated deterioration limit time that requires replacement or replenishment of oil.
Further, in the above-mentioned characteristic configuration, first, the electric resistance of the oil is measured at a predetermined measurement timing by the resistance measuring means. Then, the resistance determination unit determines whether or not the electric resistance of the oil measured at a predetermined measurement timing is equal to or less than the deterioration limit electric resistance. If the measured electrical resistance is equal to or less than the deterioration limit electrical resistance, the maintenance work determination unit has a high degree of deterioration of the oil, and it is necessary to replace the oil or replenish the oil to reduce the degree of deterioration. Or it is determined that replenishment of oil is necessary. On the other hand, if the measured electrical resistance is larger than the deterioration limit electrical resistance, the maintenance work determination unit determines that oil replacement or oil replenishment is unnecessary. Therefore, according to the above-mentioned characteristic configuration, it is possible to accurately determine whether or not oil replacement or oil replenishment is necessary.
Further, in the above characteristic configuration, the change characteristic including the deterioration limit electric resistance is stored in advance in the storage unit, and this change characteristic is based on the experimental data and the like, and the electric resistance and the operation time of the device are determined for each specific temperature. It stipulates the relationship between. Then, in this feature configuration, when the maintenance work determination unit determines that oil replacement or oil replenishment is unnecessary, the operation time of the device corresponding to the measured electrical resistance is extracted with reference to the change characteristic. Then, the estimated deterioration limit time is estimated based on the extracted operation time, the actual operation time based on the time information at the time of measuring the electric resistance, and the deterioration limit time. As described above, according to this feature configuration, it is possible to estimate the estimated deterioration limit time at which oil replacement or oil replenishment is required, as described above.

As described above, according to the above-mentioned characteristic configuration, it is possible to estimate the expected deterioration limit time at which oil replacement or oil replenishment is required, and it becomes possible to carry out appropriate maintenance in a planned manner.

Further, another characteristic configuration of the oil management system according to the present invention for achieving the above object is
A temperature measuring means for measuring the temperature of oil in the oil reservoir,
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time at which the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, it is determined whether or not the electric resistance measured at the measurement timing is lower than the electric resistance measured at the measurement timing immediately before the measurement timing. Do the processing,
When the maintenance work determination unit determines that the oil replacement and the oil replenishment are unnecessary twice in succession, the first measurement timing corresponding to the earlier determination among these determinations is performed. The deterioration is based on the first measured electric resistance and the first actual operating time, the second measured electric resistance and the second actual operating time at the second measurement timing corresponding to the later determination, and the deterioration limit electric resistance. The point is to estimate the estimated time limit .
Further, another characteristic configuration of the oil management system according to the present invention for achieving the above object is a temperature measuring means for measuring the temperature of the oil in the oil storage unit and a temperature measuring means.
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time at which the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, a process of determining whether or not the actual operating time based on the time information at the measurement timing exceeds the operating time at which the measured electrical resistance of the resistance measuring means becomes maximum. And
When the maintenance work determination unit determines that the oil replacement and the oil replenishment are unnecessary twice in succession, the first measurement timing corresponding to the earlier determination among these determinations is performed. The deterioration is based on the first measured electric resistance and the first actual operating time, the second measured electric resistance and the second actual operating time at the second measurement timing corresponding to the later determination, and the deterioration limit electric resistance. The point is to estimate the estimated time limit.

In each of the above characteristic configurations, the point that the electric resistance decreases when the oil deteriorates is utilized, and the deterioration limit scheduled time estimation unit uses the time when the electric resistance measured by the resistance measuring means becomes equal to or less than the deterioration limit electric resistance, that is, Estimate the estimated deterioration limit time that requires oil replacement or oil replenishment.
Further, in each of the above-mentioned characteristic configurations, first, the electric resistance of the oil is measured at a predetermined measurement timing by the resistance measuring means. Then, the resistance determination unit determines whether or not the electric resistance of the oil measured at a predetermined measurement timing is equal to or less than the deterioration limit electric resistance. If the measured electrical resistance is equal to or less than the deterioration limit electrical resistance, the maintenance work determination unit has a high degree of deterioration of the oil, and it is necessary to replace the oil or replenish the oil to reduce the degree of deterioration. Or it is determined that replenishment of oil is necessary. On the other hand, if the measured electrical resistance is larger than the deterioration limit electrical resistance, the maintenance work determination unit determines that oil replacement or oil replenishment is unnecessary. Therefore, according to the above-mentioned characteristic configuration, it is possible to accurately determine whether or not oil replacement or oil replenishment is necessary.
Here, the oil to be controlled contains various additives, and due to the influence of these additives, the electrical resistance measured by the resistance measuring means is higher than the initial resistance for a certain period of time from the start of operation of the device. It gradually increases, and the measured electrical resistance may gradually decrease after a certain period of time. Then, if the electric resistance measured at the measurement timing before the lapse of the operating time at which the measured electric resistance becomes maximum (in other words, the measurement timing while the measured electric resistance is gradually increasing) is used, the deterioration limit is used. The scheduled time cannot be estimated accurately.
However, prior to estimating the estimated deterioration limit time, it is determined whether or not the electric resistance measured at a predetermined measurement timing is lower than the electric resistance measured at the measurement timing immediately before this measurement timing. If it is higher than the electric resistance measured at the previous measurement timing, it is the measurement timing during the increase of the measured electric resistance, and if it is lower, the measured electric resistance is increased. Since it can be determined that the measurement timing is not in the middle of the measurement, it is possible to prevent the process of estimating the estimated deterioration limit time by using the electric resistance measured at the inappropriate measurement timing, and to perform the appropriate measurement timing. The estimated deterioration limit time can be estimated using the electrical resistance measured in.
Further, prior to estimating the estimated deterioration limit time, it is determined whether or not the actual operating time based on the time information at a predetermined measurement timing exceeds the operating time at which the measurement electric resistance of the resistance measuring means exceeds the maximum. By configuring, if the measured electrical resistance does not exceed the maximum operating time, it can be determined that the measurement timing is inappropriate, and if it exceeds the operating time, it can be determined that the measurement timing is appropriate. Similar to the above, it prevents the process of estimating the expected deterioration limit time by using the electric resistance measured at the inappropriate measurement timing, and uses the electric resistance measured at the appropriate measurement timing to prevent the deterioration limit. The scheduled time can be estimated.
Then, in each of the above-mentioned feature configurations, when it is determined twice in succession that oil replacement and oil replenishment are unnecessary, of these two determinations, the first measurement timing corresponding to the previous determination is performed. Based on 1 measured electrical resistance and 1st actual operating time, 2nd measured electrical resistance and 2nd actual operating time at the 2nd measurement timing corresponding to the later judgment, and deterioration limit electrical resistance, the deterioration limit scheduled time To estimate. As described above, according to this feature configuration, it is possible to estimate the estimated deterioration limit time at which oil replacement or oil replenishment is required, as described above.

In the above feature configuration, the following mathematical formulas 2 to 4 are used in the deterioration limit scheduled time estimation unit for estimating the deterioration limit scheduled time.
R _h = (R ₁ -R ₂ ) / (H ₁ -H ₂ ) (2)
Δh = (R _e -R ₂ ) / R _h (3)
h _e = H ₂ + Δh (4)
h _e Is the estimated deterioration limit time, R ₁ Is the first measured electrical resistance, R ₂ Is the second measured electrical resistance, h ₁ Is the first actual operating time, h ₂ Is the second actual operation time, R _e Is the deterioration limit electrical resistance.

Further, another characteristic configuration of the oil management system according to the present invention for achieving the above object is a temperature measuring means for measuring the temperature of the oil in the oil storage unit and a temperature measuring means.
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time when the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, it is determined whether or not the electric resistance measured at the measurement timing is lower than the electric resistance measured at the measurement timing immediately before the measurement timing. Do the processing,
When the maintenance work determination unit determines that it is not necessary to replace the oil and replenish the oil two or more times in succession, the resistance measurement is performed at two or more measurement timings corresponding to these determinations. An approximate expression is derived based on each measured electric resistance of the means and each actual operating time based on the time information at the time of measuring the electric resistance by the resistance measuring means, and based on the derived approximate expression and the deterioration limit electric resistance. The point is to estimate the expected deterioration limit time.
Further, another characteristic configuration of the oil management system according to the present invention for achieving the above object is a temperature measuring means for measuring the temperature of the oil in the oil reservoir and a temperature measuring means.
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time when the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, a process of determining whether or not the actual operating time based on the time information at the measurement timing exceeds the operating time at which the measured electrical resistance of the resistance measuring means becomes maximum. And
When the maintenance work determination unit determines that it is not necessary to replace the oil and replenish the oil two or more times in succession, the resistance measurement is performed at two or more measurement timings corresponding to these determinations. An approximate expression is derived based on each measured electric resistance of the means and each actual operating time based on the time information at the time of measuring the electric resistance by the resistance measuring means, and based on the derived approximate expression and the deterioration limit electric resistance. The point is to estimate the expected deterioration limit time.

In each of the above characteristic configurations, the point that the electric resistance decreases when the oil deteriorates is utilized, and the deterioration limit scheduled time estimation unit uses the time when the electric resistance measured by the resistance measuring means becomes equal to or less than the deterioration limit electric resistance, that is, Estimate the estimated deterioration limit time that requires oil replacement or oil replenishment.
Further, in each of the above-mentioned characteristic configurations, first, the electric resistance of the oil is measured at a predetermined measurement timing by the resistance measuring means. Then, the resistance determination unit determines whether or not the electric resistance of the oil measured at a predetermined measurement timing is equal to or less than the deterioration limit electric resistance. If the measured electrical resistance is equal to or less than the deterioration limit electrical resistance, the maintenance work determination unit has a high degree of deterioration of the oil, and it is necessary to replace the oil or replenish the oil to reduce the degree of deterioration. Or it is determined that replenishment of oil is necessary. On the other hand, if the measured electrical resistance is larger than the deterioration limit electrical resistance, the maintenance work determination unit determines that oil replacement or oil replenishment is unnecessary. Therefore, according to the above-mentioned characteristic configuration, it is possible to accurately determine whether or not oil replacement or oil replenishment is necessary.
Here, the oil to be controlled contains various additives, and due to the influence of these additives, the electrical resistance measured by the resistance measuring means is higher than the initial resistance for a certain period of time from the start of operation of the device. It gradually increases, and the measured electrical resistance may gradually decrease after a certain period of time. Then, if the electric resistance measured at the measurement timing before the lapse of the operating time at which the measured electric resistance becomes maximum (in other words, the measurement timing while the measured electric resistance is gradually increasing) is used, the deterioration limit is used. The scheduled time cannot be estimated accurately.
However, prior to estimating the estimated deterioration limit time, it is determined whether or not the electric resistance measured at a predetermined measurement timing is lower than the electric resistance measured at the measurement timing immediately before this measurement timing. If it is higher than the electric resistance measured at the previous measurement timing, it is the measurement timing during the increase of the measured electric resistance, and if it is lower, the measured electric resistance is increased. Since it can be determined that the measurement timing is not in the middle of the measurement, it is possible to prevent the process of estimating the estimated deterioration limit time by using the electric resistance measured at the inappropriate measurement timing, and to perform the appropriate measurement timing. The estimated deterioration limit time can be estimated using the electrical resistance measured in.
Further, prior to estimating the estimated deterioration limit time, it is determined whether or not the actual operating time based on the time information at a predetermined measurement timing exceeds the operating time at which the measurement electric resistance of the resistance measuring means exceeds the maximum. By configuring, if the measured electrical resistance does not exceed the maximum operating time, it can be determined that the measurement timing is inappropriate, and if it exceeds the operating time, it can be determined that the measurement timing is appropriate. Similar to the above, it prevents the process of estimating the expected deterioration limit time by using the electric resistance measured at the inappropriate measurement timing, and uses the electric resistance measured at the appropriate measurement timing to prevent the deterioration limit. The scheduled time can be estimated.
Then, in each of the above-mentioned characteristic configurations, when it is continuously determined that oil replacement and oil replenishment are unnecessary two or more times in succession, each measured electricity at two or more measurement timings corresponding to these determinations. An approximate expression is derived based on the resistance and each actual operation time. Then, the estimated deterioration limit time is estimated based on the derived approximate expression and the deterioration limit electrical resistance. As described above, according to this feature configuration, it is possible to estimate the estimated deterioration limit time at which oil replacement or oil replenishment is required, as described above.

Here, the higher the temperature of the oil, the smaller the change in electrical resistance (change in electrical resistance due to deterioration) with the passage of operating time, and when the change in electrical resistance is small, the measured electrical resistance is below the deterioration limit electrical resistance. When determining whether or not it is, erroneous determination is likely to occur. Therefore, from the viewpoint of improving the accuracy of determination, it is preferable that the specific temperature is low so that the change in electrical resistance with the passage of operating time becomes relatively large.

That is, a further characteristic configuration of the oil management system according to the present invention is that the specific temperature is 50 ° C. or lower.

Further, a further characteristic configuration of the oil management system according to the present invention further includes a residual oil amount detecting means for detecting the residual oil amount in the oil storage unit.
The detection result of the residual oil amount detecting means can also be input to the input unit.
The maintenance work determination unit replaces the oil or replaces the oil as a response to the oil storage unit based on the determination result of the resistance determination unit and the residual oil amount detected by the residual oil amount detecting means. The point is to determine if any of the supplements are needed.

Even if the measured electrical resistance is larger than the deterioration limit electrical resistance and it is determined that oil replacement and oil replenishment are not necessary, the oil in the oil reservoir is consumed and the remaining oil amount is a predetermined amount. If it is less than, it is actually necessary to replenish the oil.

According to the above characteristic configuration, since the amount of residual oil in the oil storage unit is detected, it is necessary to replace the oil or replenish the oil after considering the amount of residual oil in addition to the judgment result of the resistance determination unit. It is possible to accurately determine whether or not it is.

It is a schematic block diagram of an oil management system. It is a functional block diagram which shows the structure of a control device. It is a figure for demonstrating a change characteristic. It is a flowchart explaining the process of oil management of the oil management system which concerns on 1st Embodiment. It is a flowchart explaining the process of oil management of the oil management system which concerns on 2nd Embodiment. It is a figure for demonstrating the process of estimating the deterioration limit scheduled time in the oil management of the oil management system which concerns on 2nd Embodiment. It is a flowchart explaining the process of oil management of the oil management system which concerns on 3rd Embodiment.

[First Embodiment]
Hereinafter, the oil management system according to the first embodiment will be described with reference to the drawings. The oil management system according to the first embodiment is an air conditioning system that operates a heat pump using a gas engine, and the oil management system according to the present invention is applied to a system for managing engine oil used in a gas engine. Is. FIG. 1 shows a part of this air conditioning system and an oil management system according to the present embodiment, and as a part of the air conditioning system, an oil pan 3 for storing engine oil 2 in a gas engine 1 and a lower part of the gas engine 1. And the oil tank 5 connected to the oil pan 3 by the oil pipe 4 is shown. In the air conditioning system, the engine oil 2 is stored in both the oil pan 3 and the oil tank 5, and as the engine oil 2 is consumed from the oil pan 3, both the oil pan 3 and the oil tank 5 are stored. The position of the liquid level of the engine oil 2 in the oil pan 3 and the oil tank 5 is gradually lowered while keeping the position of the liquid level of the engine oil 2 the same.

As shown in FIG. 1, the oil management system according to the first embodiment has a composite sensor 6 that measures the temperature, electric resistance, and residual oil amount of the engine oil 2, and a composite sensor 6 that is connected to the composite sensor 6 and is connected to the composite sensor 6. It is provided with a control device 8 that performs predetermined processing based on a signal (including measurement results).

The composite sensor 6 includes a sensor substrate 6a in which two electrode portions facing each other with a minute gap are arranged, and a sensor detection circuit (not shown) connected to the sensor substrate 6a, and the sensor substrate 6a is provided. It is a sensor that can measure the temperature, electric resistance, and the position of the liquid level of the engine oil 2 based on the signal from. The composite sensor 6 is provided in the oil tank 5 as an oil storage portion. In the present embodiment, the composite sensor 6 has an oil level in the oil tank 5 when the engine oil 2 is at a reference amount. The lower end of the sensor substrate 6a is located at the height position of the oil tank 5, and is supported by the sensor guide 7 having a function as a cap in a state of being inserted into a supply port formed in the upper part of the oil tank 5. According to this composite sensor 6, when the sensor substrate 6a is immersed in the engine oil 2, electricity flows between the electrodes, and the electric resistance of the engine oil 2 can be measured. Further, since the electrostatic capacity increases as the number of electrodes immersed in the engine oil 2 increases, the position of the liquid level of the engine oil 2 can be detected based on the electrostatic capacity, and the position of the detected liquid level can be detected. The amount of residual oil can be measured based on this. In the present embodiment, the composite sensor 6 functions as a temperature measuring means, a resistance measuring means, and a residual oil amount detecting means.

As shown in FIG. 2, the control device 8 includes a timer 9 that measures the integrated operation time of the gas engine 1 from the start of management by the oil management system, and a communication device that can transmit and receive data by wire or wirelessly. It includes a communication unit 10, a storage unit 11 including, for example, a hard disk for storing various data, and a calculation unit 12 including a CPU for performing various data processing. Here, the communication unit 10 functions as an input unit capable of inputting a signal (including measurement results) from the composite sensor 6 and an integrated operation time of the gas engine 1 (an example of actual operation time based on time information). .. In this embodiment, the microcomputer as the control device 8 is incorporated in the outdoor unit used in the air conditioning system, and the operation control of the air conditioning system is also performed.

The storage unit 11 continuously or intermittently acquires information on the temperature of the engine oil 2, the electric resistance of the engine oil 2, and the position of the liquid level of the engine oil 2, and the storage unit 11 is in the storage unit 11 the temperature of the engine oil 2. Is temporarily or accumulated and stored in a state in which the electric resistance of the engine oil 2 when the specific temperature is predetermined is associated with the integrated operating time of the gas engine 1 when the electric resistance is measured. Will be done. Further, in the storage unit 11, information regarding the position of the liquid level of the engine oil 2 is temporarily or accumulated and stored.

Further, the storage unit 11 stores in advance the deterioration limit electric resistance, which is the electric resistance when the gas engine 1 is operated for the deterioration limit time under a predetermined condition, and is the change characteristic with respect to the specific temperature, which is the gas engine. When 1 is operated for a deterioration limit time under predetermined conditions, the relationship between the electric resistance when the electric resistance of the engine oil 2 changes to the deterioration limit electric resistance and the operation time of the gas engine 1 is defined in advance. The characteristics are remembered. Specifically, as shown in FIG. 3, the change characteristics in the present embodiment are the operating time of the gas engine 1 and the engine oil 2 when the gas engine 1 is operated with a high load for 10,000 hours (deterioration limit time). The relationship with the electric resistance is defined for the cases where the temperature of the engine oil 2 is 25 ° C, 30 ° C, and 35 ° C (an example of a specific temperature), respectively.

The calculation unit 12 is a resistance determination unit 13 for determining whether or not the electric resistance (measured electric resistance) of the engine oil 2 measured by the composite sensor 6 is equal to or less than the deterioration limit electric resistance, and the resistance determination unit 13. The electrical resistance of the engine oil 2 measured by the composite sensor 6 and the maintenance work determination unit 14 that determines the necessity of maintenance work based on the determination result and the amount of residual oil of the engine oil 2 measured by the composite sensor 6 It has a deterioration limit scheduled time estimation unit 15 for estimating a deterioration limit scheduled time that is equal to or less than the deterioration limit electric resistance.

Specifically, the resistance determination unit 13 determines whether or not the measured electric resistance is equal to or less than the deterioration limit electric resistance. Then, when the amount of residual oil measured by the composite sensor 6 is less than a predetermined amount, the maintenance work determination unit 14 determines that the engine oil 2 needs to be replenished. When the amount of remaining oil is equal to or more than a predetermined amount and the measured electric resistance is equal to or less than the deterioration limit electric resistance, the degree of deterioration of the engine oil 2 is high, and the engine oil 2 is replaced or the engine oil 2 is replenished to reduce the degree of deterioration. Since it is necessary, the maintenance work determination unit 14 determines that the engine oil 2 needs to be replaced or the engine oil 2 needs to be replenished. On the other hand, when the remaining oil amount is equal to or more than a predetermined amount and the measured electric resistance is determined to be larger than the deterioration limit electric resistance, the maintenance work determination unit 14 replaces the engine oil 2 and replenishes the engine oil 2. Determined to be unnecessary.

Further, the deterioration limit scheduled time estimation unit 15 estimates the deterioration limit scheduled time after receiving the determination result from the maintenance work determination unit 14 that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are unnecessary. Specifically, the deterioration limit scheduled time estimation unit 15 refers to the change characteristics stored in advance in the storage unit 11 and extracts the operating time of the gas engine 1 corresponding to the electric resistance measured by the composite sensor 6. Based on the extracted operation time, the integrated operation time of the gas engine 1, and the deterioration limit time, the deterioration limit is planned so that the electric resistance measured by the composite sensor 6 is equal to or less than the deterioration limit electric resistance according to the following formula 1. Estimate the time. In Equation 1, _{he is the planned deterioration limit time, h is the deterioration limit time, ha is the integrated operation time, and h b is the} extracted operation time.
(Formula 1)
he _e = h (ha _a / h _b )

Next, when the oil management system having the above configuration determines whether or not the engine oil 2 should be replaced or the engine oil 2 should be replenished, and the engine oil 2 should be replaced or the engine oil 2 should not be replenished. The mode of oil management for estimating the estimated deterioration limit time at which the engine oil 2 needs to be replaced or the engine oil 2 needs to be replenished will be described below with reference to FIG. Note that FIG. 4 is a flowchart for explaining the process of oil management.

In this oil management system, management is started when the engine oil 2 is newly supplied into the oil tank 5, and counting of the integrated operation time of the gas engine 1 is started (process # 1). Then, it is determined whether or not the temperature of the engine oil 2 measured by the composite sensor 6 is the measurement timing that is the specific temperature (step # 2), and if it is the measurement timing, the measurement of the composite sensor 6 is performed. The electric resistance is stored in the storage unit 11 in a state linked to the integrated operating time of the gas engine 1 at the time of measuring the electric resistance, and the information regarding the position of the liquid level of the engine oil 2 is also stored in the storage unit 11 (step # 3). ), Move to step # 4. On the other hand, if it is not the measurement timing, it returns.

In step # 4, it is determined whether or not the remaining oil amount is equal to or more than the predetermined amount based on the position of the liquid level of the engine oil 2, and if it is less than the predetermined amount, it is necessary to replenish the engine oil 2. The determination result is appropriately transmitted to an external device to notify the administrator that the engine oil 2 needs to be replenished (process # 5), and the management is terminated (interrupted). On the other hand, if it is determined that the replacement and replenishment of the engine oil 2 is unnecessary from the viewpoint of the remaining oil amount when the amount is equal to or more than the predetermined amount, the process proceeds to step # 6.

In step # 6, the resistance determination unit 13 determines whether or not the measured electrical resistance is equal to or less than the deterioration limit electrical resistance at a predetermined specific temperature, and the process proceeds to step # 7.

In step # 7, if the resistance determination unit 13 determines that the measured electrical resistance is equal to or less than the deterioration limit electrical resistance, it is determined that the engine oil 2 needs to be replaced or replenished, and the determination result is appropriately sent to an external device. It is transmitted to notify the manager that the engine oil 2 needs to be replaced or the engine oil 2 needs to be replenished (step # 8), and the management is terminated (interrupted). On the other hand, if it is determined that the resistance is not equal to or less than the deterioration limit electric resistance, it is determined that the replacement of the engine oil 2 or the replenishment of the engine oil 2 is unnecessary, and the process proceeds to step # 9.

In step # 9, the operating time of the gas engine 1 corresponding to the measured electrical resistance of the composite sensor 6 is extracted with reference to the change characteristic. _For example, as shown in FIG. 3, when the measured electric resistance Ra is measured at 25 ° C., the operating time of the gas engine 1 is referred to with reference to the change characteristic when the specific temperature is 25 ° C. Extract h _b . Then, based on the extracted operation time, the integrated operation time of the gas engine 1, and the deterioration limit time, the electric resistance measured by the composite sensor 6 according to the above equation 1 is 25 ° C. Estimate the estimated deterioration limit time that is equal to or less than the deterioration limit electrical resistance, and move to step # 2. The estimated deterioration limit time is appropriately notified to the administrator by an external device.

In the oil management system according to the first embodiment, when the manager replenishes the engine oil 2, the electric resistance measured by the composite sensor 6 is replenished due to the influence of the additive of the replenished engine oil 2. It may be lower than before. Therefore, the measured electric resistance immediately after replenishment may be equal to or less than the deterioration limit electric resistance, and it may be determined that the engine oil 2 needs to be replaced or the engine oil 2 needs to be replenished even though the engine oil 2 has been replenished. .. Therefore, when the engine oil 2 is replenished, it is preferable that the resistance determination unit 13 performs the determination process at least from the time when the measured electric resistance becomes higher than the electric resistance measured before the replenishment.

As described above, in the oil management system according to the first embodiment, the deterioration limit electric resistance and the change characteristic at a specific temperature are stored in the storage unit 11 in advance, and the electric resistance of the engine oil 2 at the specific temperature is measured. However, since this is used, the necessity of replacing the engine oil 2 and replenishing the engine oil 2 can be determined and the estimated deterioration limit time can be estimated without performing processing such as temperature correction on the measured electrical resistance. It can be done easily and accurately. Therefore, appropriate maintenance can be systematically performed.

[Second Embodiment]
The oil management system according to the second embodiment is different from the first embodiment in the information stored in advance in the storage unit 11, the content of the processing in the deterioration limit scheduled time estimation unit 15, and the oil management process. Hereinafter, the oil management system of the second embodiment will be described, but the description of the same configuration as that of the first embodiment will be omitted.

Further, the deterioration limit scheduled time estimation unit 15 estimates the deterioration limit scheduled time after receiving the determination result from the maintenance work determination unit 14 that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are unnecessary. Specifically, when the maintenance work determination unit 14 determines in the maintenance work determination unit 14 that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are unnecessary twice in succession, the deterioration limit scheduled time estimation unit 15 determines these. Of these, the first measured electric resistance measured at the first measurement timing corresponding to the previous determination, the first integrated operation time (first actual operation time) at the time of measuring the electric resistance, and the second corresponding to the later determination. Based on the second measured electric resistance measured at the measurement timing, the second integrated operation time (second actual operation time) at the time of measuring the electric resistance, and the deterioration limit electric resistance stored in advance in the storage unit 11, the following From Equations 2 to 4, the estimated deterioration limit time at which the electric resistance measured by the composite sensor 6 is equal to or less than the deterioration limit electric resistance is estimated. In Equations 2 to 4, he is the estimated deterioration limit time, R ₁ is the first measured electric resistance, R ₂ is the second measured electric resistance, _{h 1} is the first integrated operation time, and h ₂ is the second integrated operation. Time, _Re is the deterioration limit electrical resistance.
(Formula 2)
R _h = (R ₁ -R ₂ ) / (h ₁ -h ₂ )
(Formula 3)
Δh = (R _e −R ₂ ) / R _h
(Formula 4)
he _e = h ₂ + Δh

Further, in the deterioration limit scheduled time estimation unit 15, the electric resistance measured at a predetermined measurement timing prior to the deterioration limit scheduled time estimation process is the electricity measured at the measurement timing one before the measurement timing. Performs a process of determining whether or not the resistance is lower than the resistance.

Next, the oil management system according to the second embodiment having the above configuration determines whether or not the engine oil 2 should be replaced or the engine oil 2 should be replenished, and the engine oil 2 should be replaced or the engine oil 2 should be replenished. The mode of oil management for estimating the expected deterioration limit time required for the oil will be described below with reference to FIG. Note that FIG. 5 is a flowchart for explaining the process of oil management by the oil management system according to the second embodiment, and steps # 11 to # 18 are steps # 1 to step # of the first embodiment. Since it is the same as No. 8, the description thereof will be omitted.

Here, the engine oil 2 to be managed contains various additives, and due to the influence of these additives, the composite sensor 6 is used for a certain period of time from the start of operation of the gas engine 1, regardless of the temperature. The electrical resistance measured by the above may gradually increase from the initial resistance, and the measured electrical resistance may gradually decrease after a certain period of time (see FIG. 3). Therefore, the first and second measured electrical resistances used when estimating the estimated deterioration limit time are the measurement timing before the operation time when the measured electrical resistance becomes maximum elapses (in other words, the measured electrical resistance gradually increases). If it is measured at the measurement timing during the measurement), the estimated deterioration limit time cannot be estimated accurately.

Therefore, in the present embodiment, prior to the process of estimating the estimated deterioration limit time, it is determined whether or not the measured electrical resistance is lower than the electrical resistance measured at the previous measurement timing, and the previous measurement is performed. If it is lower than the electrical resistance measured at the timing, the process proceeds to step # 19, and if it is higher, the process proceeds to step # 12. As a result, it is possible to prevent the process of estimating the estimated deterioration limit time from being performed by using the electric resistance measured at an inappropriate measurement timing as the first and second measured electric resistances.

In step # 19, it is determined twice in succession that it is not necessary to replace the engine oil 2 and replenish the engine oil 2 based on the determination result that the measured electric resistance at the same specific temperature is larger than the deterioration limit electric resistance. If it is not continuous twice, the process returns to step # 12, and if it is continuous twice, the process proceeds to step # 20. The case where the determination that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are unnecessary is performed twice in succession is, for example, the first case where the specific temperature is 25 ° C. as shown in FIG. And it is judged that the electric resistances _R1 and R2 measured at the _second measurement timing are larger than the deterioration limit electric resistance twice in a row, and based on these judgment results, the engine oil 2 is replaced and the engine oil 2 is replenished. This is the case when the necessity is judged. Note that FIG. 6 shows, for convenience, the change in the electric resistance of the engine oil 2 when the gas engine 1 is operated under a predetermined condition for the deterioration limit time.

In step # 20, for example, as shown in FIG. 6, the engine oil 2 is replaced and the engine oil 2 is replaced based on the determination result that the measured electric resistance when the specific temperature is 25 ° C. is larger than the deterioration limit electric resistance. When it is determined twice in a row that replenishment is unnecessary, the first measured electrical resistance (R ₁ in FIG. 6) and the electrical resistance measurement at the first measurement timing corresponding to the previous determination are performed. The first integrated operation time at the time (h ₁ in FIG. 6), the second measured electrical resistance at the second measurement timing corresponding to the later determination (R ₂ in FIG. 6), and the second integrated operation at the time of electrical resistance measurement. Based on the time (h ₂ in FIG. 6) and the deterioration limit electrical resistance when the specific temperature is 25 ° C, the electrical resistance measured by the composite sensor 6 according to Equations 2 to 4 is 25 ° C at the specific temperature. If the deterioration limit is equal to or less than the electrical resistance, the estimated deterioration limit time is estimated, and the process proceeds to step # 12. The estimated deterioration limit time is appropriately notified to the administrator by an external device.

As described above, according to the oil management system according to the second embodiment, the deterioration limit electric resistance and the change characteristic at a specific temperature are stored in advance in the storage unit 11 as in the first embodiment, and the specific temperature is stored. Since the electric resistance of the engine oil 2 is measured and used in the above, it is necessary to replace the engine oil 2 and replenish the engine oil 2 without performing processing such as temperature correction on the measured electric resistance. It is possible to easily and accurately estimate the deterioration limit and the estimated deterioration limit time, and it is possible to carry out appropriate maintenance in a planned manner.

[Third Embodiment]
The oil management system according to the third embodiment is a modification of the second embodiment. Hereinafter, the oil management system of the third embodiment will be described, but the description of the same configurations as those of the first and second embodiments will be omitted.

The estimated deterioration limit time estimation unit 15 in the third embodiment estimates the estimated deterioration limit time after receiving the determination result from the maintenance work determination unit 14 that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are unnecessary. .. Specifically, when the maintenance work determination unit 14 determines in the maintenance work determination unit 14 that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are unnecessary two or more times in succession, the deterioration limit scheduled time estimation unit 15 determines each determination. An approximate expression is derived based on each measured electric resistance at two or more measurement timings corresponding to the above and the integrated operation time at the time of each electric resistance measurement, and the derived approximate expression and the deterioration limit electricity stored in advance in the storage unit 11 are obtained. Based on the resistance, the estimated deterioration limit time at which the electric resistance measured by the composite sensor 6 is equal to or less than the deterioration limit electric resistance is estimated.

Further, in the deterioration limit scheduled time estimation unit 15, the electric resistance measured at a predetermined measurement timing is lower than the electric resistance measured at the measurement timing immediately before this measurement timing, as in the second embodiment. Performs the process of determining whether or not.

Next, the oil management system according to the third embodiment having the above configuration determines whether or not the engine oil 2 needs to be replaced or the engine oil 2 needs to be replenished, and the oil needs to be replaced or the oil needs to be replenished. An mode of oil management for estimating the estimated deterioration limit time will be described below with reference to FIG. 7. Note that FIG. 7 is a flowchart for explaining the process of oil management by the oil management system in the third embodiment, and steps # 31 to # 38 are the steps # 1 to # 8 of the first embodiment. Since it is the same as the above, the description is omitted.

Here, in the third embodiment, each measured electric resistance used when deriving the approximate expression is the measurement timing before the operation time when the measured electric hand hole becomes maximum elapses (in other words, the measured electric resistance gradually increases. If it is measured at the measurement timing while rising to the above, the derived approximate expression will be inaccurate, and even if the approximate expression is used, the estimated deterioration limit time cannot be estimated accurately. ..

Therefore, also in the third embodiment, prior to the process of estimating the estimated deterioration limit time, it is determined whether or not the measured electric resistance is lower than the electric resistance measured at the previous measurement timing, and the previous one is determined. If it is lower than the electric resistance measured at the measurement timing, the process proceeds to step # 39, and if it is higher, the process proceeds to step # 32. As a result, it is possible to prevent the process of estimating the estimated deterioration limit time from being performed by using the approximate expression derived based on the electric resistance measured at an inappropriate measurement timing.

In step # 39, it is determined that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are not necessary two or more times in succession based on the determination result that the measured electric resistance at the same specific temperature is larger than the deterioration limit electric resistance. If it is not continuous two or more times, the process returns to step # 32, and if it is continuous two or more times, the process proceeds to step # 40. When the judgment that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are unnecessary based on the judgment result that the measured electric resistance at the same specific temperature is larger than the deterioration limit electric resistance is consecutively performed twice or more. For example, it was determined that the measured electrical resistance at 25 ° C. was larger than the deterioration limit electrical resistance three times in a row, and based on these determination results, it was determined whether or not the engine oil 2 should be replaced and the engine oil 2 should be replenished. This is the case.

In step # 40, for example, it is not necessary to replace the engine oil 2 and replenish the engine oil 2 based on the determination result that the measured electric resistance when the specific temperature is 25 ° C. is larger than the deterioration limit electric resistance. When the determination is made continuously more than once, an approximate expression is derived based on the measured electrical resistance at the measurement timing corresponding to each determination and the integrated operation time at the time of measuring the electrical resistance, and the process proceeds to step # 41.

Then, in step # 41, when the electric resistance measured by the composite sensor 6 is 25 ° C. based on the derived approximate expression and the deterioration limit electric resistance when the specific temperature is 25 ° C. Estimate the estimated deterioration limit time that is equal to or less than the deterioration limit electrical resistance of, and move to step # 32. The estimated deterioration limit time is appropriately notified to the administrator by an external device. In the present embodiment, if it is determined that it is not necessary to replace the engine oil 2 or replenish the engine oil 2 after estimating the estimated deterioration limit time, the measurement timing corresponding to the determination is used. Based on the measured electrical resistance and the integrated operating time at the time of measuring the electrical resistance, the estimated deterioration limit time is calculated (estimated) after correcting the derived approximate formula. Therefore, the number of data used for deriving the approximate expression gradually increases, and a highly accurate approximate expression can be obtained.

As described above, according to the oil management system according to the third embodiment, the deterioration limit electric resistance and the change characteristic at a specific temperature are stored in advance in the storage unit 11 as in the first and second embodiments. Since the electric resistance of the engine oil 2 at a specific temperature is measured and used, the engine oil 2 is replaced and the engine oil 2 is replenished without performing processing such as temperature correction on the measured electric resistance. It is possible to easily and accurately determine the necessity of the oil and estimate the estimated deterioration limit time, and it is possible to carry out appropriate maintenance in a planned manner.

[Another Embodiment]
[1] In each of the above embodiments, the configuration of the oil management system has been described with specific examples, but the configuration can be changed as appropriate. For example, in the above-mentioned first embodiment, 25 ° C., 30 ° C., and 35 ° C. are exemplified as specific temperatures, but the temperature is not limited thereto. As shown in FIG. 3, in the engine oil 2, the higher the temperature, the smaller the change in electrical resistance (change in electrical resistance due to deterioration) with the passage of time, and if the change in electrical resistance is small, an erroneous determination is made. It is easy to happen. Therefore, from the viewpoint of improving the accuracy of determination, the specific temperature is preferably a low temperature at which the change in electrical resistance with the passage of time becomes relatively large, specifically 50 ° C. or lower.

[2] In each of the above embodiments, the temperature of the engine oil 2, the electric resistance of the engine oil 2, and the position of the liquid level of the engine oil 2 are collectively detected by one composite sensor 6, but this is limited to this. It is also possible to provide a sensor for detecting temperature, a sensor for detecting electric resistance, and a sensor for detecting the position of the liquid level.

[3] In each of the above embodiments, an embodiment in which a microcomputer as a control device 8 is incorporated in an outdoor unit used in an air conditioning system has been described as an example, but the present invention is not limited thereto. For example, the processing function carried out by the control device 8 may be incorporated into the sensor detection circuit of the composite sensor 6, or the processing function carried out by the control device 8 may be provided in an external processing center, and various measurements may be made by the composite sensor 6. The measurement result may be transmitted to an external processing center.

[4] In the second embodiment and the third embodiment, it is determined whether or not the measured electrical resistance is lower than the electrical resistance measured at the previous measurement timing prior to the process of estimating the estimated deterioration limit time. However, instead of such a determination, it is determined whether or not the integrated operating time at a predetermined measurement timing exceeds the operating time at which the measured electrical resistance of the composite sensor 6 becomes maximum. Is also good. The operating time at which the measured electrical resistance becomes maximum is stored in the storage unit 11 in advance.

In this case, if the integrated operating time at a predetermined measurement timing exceeds the operating time at which the measured electrical resistance becomes maximum, the process proceeds to step # 19 in the second embodiment and step # 39 in the third embodiment. If not, the process proceeds to step # 12 in the second embodiment and to step # 32 in the third embodiment. As a result, in the second embodiment, it is possible to prevent the process of estimating the estimated deterioration limit time by using the electric resistance measured at an inappropriate measurement timing as the first and second measured electric resistances. .. Further, in the third embodiment, it is possible to prevent the process of estimating the estimated deterioration limit time by using the approximate expression derived based on the electric resistance measured at an inappropriate measurement timing.

[5] In the third embodiment, when it is determined that the replacement of the engine oil 2 and the replenishment of the engine oil 2 are not necessary two or more times in succession, the measured electrical resistance and the measured electrical resistance at the measurement timing corresponding to this determination are performed. Although the mode of deriving the approximate expression by using the integrated operation time at the time of measuring the electric resistance has been described as an example, the present invention is not limited to such a mode. For example, the measured electric resistance at the measurement timing at regular intervals (for example, 500 h and 1000 h intervals) and the integrated operating time at the time of measuring the electric resistance are acquired, and a fixed time has elapsed after the operating time at which the measured electric resistance becomes maximum has elapsed. An approximate expression may be derived based on the acquired measured electrical resistance and integrated operating time at the stage where a certain number of measured electrical resistances and integrated operating times have been acquired. In this case, after estimating the estimated deterioration limit time from the derived approximate formula, if it is determined that it is not necessary to replace the engine oil 2 or replenish the engine oil 2, the measurement timing corresponding to the determination is used. Based on the measured electrical resistance and the integrated operating time at the time of electrical resistance measurement, the estimated deterioration limit time is calculated (estimated) after correcting the derived approximate formula. Therefore, as in the third embodiment, the number of data used for deriving the approximate expression gradually increases, and a highly accurate approximate expression can be obtained.

[6] In each of the above embodiments, an embodiment in which the oil management system determines whether or not the engine oil 2 needs to be replaced or replenished based on the electric resistance of the engine oil 2 and the amount of the engine oil 2 in the oil tank 5 has been described. However, for example, the operating load factor of the gas engine 1 can be calculated by the following formula 5, and the replacement cycle of parts such as an ignition plug and an oil filter can be determined based on the operating load factor. In Equation 5, F is the operating load factor, h is the deterioration limit time, and he is the expected deterioration limit time.
(Formula 5)
F = he / h

It should be noted that the configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in other embodiments as long as there is no contradiction. The embodiments disclosed in the present specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

INDUSTRIAL APPLICABILITY The present invention can accurately determine whether or not oil replacement or oil replenishment is necessary, and can estimate the estimated deterioration limit time when oil replacement or oil replenishment is required, and can be systematically determined. It can be used for oil management systems that can perform appropriate maintenance.

1 Gas engine 5 Oil tank 6 Composite sensor 8 Control device 10 Communication unit 11 Storage unit 12 Calculation unit 13 Resistance judgment unit 14 Maintenance work judgment unit 15 Deterioration limit scheduled time estimation unit

Claims (8)

A temperature measuring means for measuring the temperature of oil in the oil reservoir,
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time at which the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance .
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit .
The storage unit has a change characteristic defined for each specific temperature, and when the device is operated under the predetermined conditions for the deterioration limit time, the electric resistance of the oil is the deterioration limit electric resistance. The change characteristics in which the relationship between the electrical resistance and the operating time of the device when the temperature changes to the above are specified in advance are stored.
The deterioration limit scheduled time estimation unit is
When the maintenance work determination unit determines that it is not necessary to replace the oil or replenish the oil, the operating time of the device corresponding to the measured electrical resistance of the resistance measuring means with reference to the change characteristic. Extracted,
Based on the extracted operation time, the actual operation time based on the time information at the time of resistance measurement by the resistance measuring means, and the deterioration limit time, the estimated deterioration limit time is estimated using the following formula 1. Oil management system.
he _e = h (ha a _/ h _b ) (1)
_e is the expected deterioration limit time, h is the deterioration limit time, ha is _the actual operation time, and h _b is the extracted operation time. A temperature measuring means for measuring the temperature of oil in the oil reservoir,
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time when the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, it is determined whether or not the electric resistance measured at the measurement timing is lower than the electric resistance measured at the measurement timing immediately before the measurement timing. Do the processing,
When the maintenance work determination unit determines that the oil replacement and the oil replenishment are unnecessary twice in succession, the first measurement timing corresponding to the earlier determination among these determinations is performed. The deterioration is based on the first measured electric resistance and the first actual operating time, the second measured electric resistance and the second actual operating time at the second measurement timing corresponding to the later determination, and the deterioration limit electric resistance. An oil management system that estimates the estimated time limit. A temperature measuring means for measuring the temperature of oil in the oil reservoir,
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time when the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, a process of determining whether or not the actual operating time based on the time information at the measurement timing exceeds the operating time at which the measured electrical resistance of the resistance measuring means becomes maximum. And
When the maintenance work determination unit determines that the oil replacement and the oil replenishment are unnecessary twice in succession, the first measurement timing corresponding to the earlier determination among these determinations is performed. The deterioration is based on the first measured electric resistance and the first actual operating time, the second measured electric resistance and the second actual operating time at the second measurement timing corresponding to the later determination, and the deterioration limit electric resistance. An oil management system that estimates the estimated time limit. The oil management system according to claim 2 or 3, wherein the deterioration limit scheduled time estimation unit uses the following formulas 2 to 4 for estimating the deterioration limit scheduled time.
R _h = (R ₁ -R ₂ ) / (H ₁ -H ₂ ) (2)
Δh = (R _e -R ₂ ) / R _h (3)
h _e = H ₂ + Δh (4)
h _e Is the estimated deterioration limit time, R ₁ Is the first measured electrical resistance, R ₂ Is the second measured electrical resistance, h ₁ Is the first actual operating time, h ₂ Is the second actual operation time, R _e Is the deterioration limit electrical resistance. A temperature measuring means for measuring the temperature of oil in the oil reservoir,
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time when the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, it is determined whether or not the electric resistance measured at the measurement timing is lower than the electric resistance measured at the measurement timing immediately before the measurement timing. Do the processing,
When the maintenance work determination unit determines that it is not necessary to replace the oil and replenish the oil two or more times in succession, the resistance measurement is performed at two or more measurement timings corresponding to these determinations. An approximate expression is derived based on each measured electric resistance of the means and each actual operating time based on the time information at the time of measuring the electric resistance by the resistance measuring means, and based on the derived approximate expression and the deterioration limit electric resistance. , An oil management system that estimates the estimated deterioration limit time. A temperature measuring means for measuring the temperature of oil in the oil reservoir,
A resistance measuring means for measuring the electrical resistance of the oil at least at a measurement timing at which the measuring temperature of the temperature measuring means is a specific temperature.
An oil management system equipped with control means for controlling operation.
The control means is
An input unit capable of inputting the measured temperature of the temperature measuring means, the measured electrical resistance of the resistance measuring means, and the time information regarding the actual operating time of the device equipped with the oil storage unit.
A storage unit in which the electrical resistance of the oil when the oil is at the specific temperature, which is the electrical resistance when the device is operated for a deterioration limit time under predetermined conditions, is stored in advance.
A deterioration limit scheduled time estimation unit that estimates a deterioration limit scheduled time when the electrical resistance measured by the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
A resistance determination unit for determining whether or not the measured electrical resistance of the resistance measuring means is equal to or less than the deterioration limit electrical resistance.
Based on the determination result of the resistance determination unit, it has a maintenance work determination unit that determines whether or not it is necessary to replace the oil or replenish the oil as a response to the oil storage unit.
The deterioration limit scheduled time estimation unit is
Prior to estimating the expected deterioration limit time, a process of determining whether or not the actual operating time based on the time information at the measurement timing exceeds the operating time at which the measured electrical resistance of the resistance measuring means becomes maximum. And
When the maintenance work determination unit determines that it is not necessary to replace the oil and replenish the oil two or more times in succession, the resistance measurement is performed at two or more measurement timings corresponding to these determinations. An approximate expression is derived based on each measured electric resistance of the means and each actual operating time based on the time information at the time of measuring the electric resistance by the resistance measuring means, and based on the derived approximate expression and the deterioration limit electric resistance. , An oil management system that estimates the estimated deterioration limit time. The oil management system according to any one of claims 1 to 6, wherein the specific temperature is 50 ° C. or lower. Further provided with a residual oil amount detecting means for detecting the residual oil amount in the oil storage portion,
The detection result of the residual oil amount detecting means can also be input to the input unit.
The maintenance work determination unit replaces the oil or replaces the oil as a response to the oil storage unit based on the determination result of the resistance determination unit and the residual oil amount detected by the residual oil amount detecting means. The oil management system according to any one of claims 1 to 7, wherein it is determined whether or not any of the replenishment is necessary.

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