JP5577972B2 - Oil purification device for internal combustion engine - Google Patents

Description

  The present invention relates to an oil purification device for an internal combustion engine.

  Conventionally, engine oil has been used for engine lubrication and cooling. The engine oil is stored, for example, in an oil pan provided at the lower part of the engine, and is supplied to each part of the engine by an oil pump. The engine oil that has circulated through each part of the engine is dripped into the oil pan. The engine oil dripped into the oil pan is circulated again to each part of the engine by the oil pump. During this time, the engine oil receives heat from each part of the engine and cools each part. The engine oil also has a role of forming an oil film in each part of the engine to promote lubrication between the parts and preventing oxidation of the parts.

  Impurities are mixed into the engine oil that has circulated through each part of the engine. In order to remove this impurity, an oil filter is provided in an oil passage through which engine oil flows. For example, a filter such as an ion exchange resin is placed in the oil filter, and the engine oil is released into the engine oil when the engine oil passes through the oil filter. There has been proposed a method for suppressing deterioration of the film (for example, Patent Document 1).

Special table 2008-540123

  The purification efficiency of a filter such as an ion exchange resin varies depending on the temperature of engine oil flowing through the filter. The oil temperature of the engine oil varies from a low temperature to a high temperature depending on the state of the engine. For this reason, even when the purification efficiency of the filter is not sufficient, the engine oil may flow through the filter, and ions etc. that were initially attached to the filter may flow out into the engine oil, which may shorten the life of the filter. .

  In addition, the oil temperature of the engine oil may be higher than the heat resistant limit temperature of the filter. When such high-temperature engine oil flows through the filter, the filter may be destroyed and performance may be deteriorated.

  The present invention has been made in view of the above problems, and an object thereof is to provide an oil purification device for an internal combustion engine that can suppress deterioration of a filter.

The above object is arranged in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a function in which purification efficiency changes according to the oil temperature of the inflowing engine oil, and flows into the filter oil temperature of the engine oil to the said filter so is within the temperature range capable of exhibiting a predetermined said purification efficiency, and Luba Lube change the flow of the engine oil toward the filter, the circulation oil path Connected to the circulating oil passage downstream from the provided oil cooler and upstream from each part of the engine, the engine oil before passing through the oil cooler and flowing through each part of the engine is provided with the filter An oil passage that allows the oil to flow into the oil pan. If the terpolymer is out of the temperature range capable of exhibiting the predetermined purification efficiency, and wherein the engine oil before flowing through and the various parts of the engine through the oil cooler is a valve state flowing into the oil pan This can be achieved by an oil purification device for an internal combustion engine. According to this, deterioration of the filter can be suppressed.

The said structure WHEREIN: The said valve | bulb can be set as the structure which is a thermostat.

In the above structure, before a control unit for controlling the Kiba Lube, wherein the control unit, the oil temperature of the engine oil in said oil pan, out of the temperature range in which the filter can exhibit the predetermined purification efficiency If the, front Kiba lube can the engine oil before flowing through and the various parts of the engine through the oil cooler is configured to valve state flowing into the oil pan.

In the above structure, before Kiba Lube it can be configured to be a relief valve which opens and closes in response to hydraulic pressure of the engine oil.

The above object is arranged in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a function in which purification efficiency changes according to the oil temperature of the inflowing engine oil, and flows into the filter A valve that changes the flow of the engine oil toward the filter so that the oil temperature of the engine oil is within a temperature range in which the filter can exhibit the predetermined purification efficiency, and a branching portion in the circulation oil path in branches, with joins the circulating oil passage at the merging portion on the downstream side of the branch portion, and a fluid passage wherein the filter is provided, before Kiba Lube is a thermostat, the engine oil the oil temperature, if the filter is outside the temperature range capable of exhibiting the predetermined conversion efficiency, provided the engine oil before Symbol oil passage It can be achieved by an oil purification device for an internal combustion engine characterized by comprising a valve state of not flowing into the filter is.

The above object is arranged in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a function in which purification efficiency changes according to the oil temperature of the inflowing engine oil, and flows into the filter A first valve that changes a flow of the engine oil toward the filter, and a circulating oil passage so that an oil temperature of the engine oil is within a temperature range in which the filter can exhibit the predetermined purification efficiency. Branching at the branching section, joining to the circulating oil path at the junction downstream of the branching section, an oil path provided with the filter, a bypass oil path bypassing the filter, and the engine oil A second valve for switching between flowing through the oil passage provided with the filter or flowing through the bypass oil passage, and the first A control unit that controls the valve and the second valve, and the control unit is configured so that when the oil temperature of the engine oil is out of a temperature range in which the filter can exhibit the predetermined purification efficiency, The first valve is in a valve state in which the engine oil does not flow into the oil passage, and the second valve is placed in the oil passage in which the engine oil flows into the bypass oil passage and the filter is provided. This can be achieved by an oil purifying device for an internal combustion engine characterized in that the valve state is not set.

The above object is arranged in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a function in which purification efficiency changes according to the oil temperature of the inflowing engine oil, and flows into the filter A valve that changes the flow of the engine oil toward the filter so that the oil temperature of the engine oil is within a temperature range in which the filter can exhibit the predetermined purification efficiency, and a branching portion in the circulation oil path And an oil passage where the filter is provided, and the valve has an oil temperature of the engine oil, When the filter is out of the temperature range where the predetermined purification efficiency can be exhibited, the engine oil is applied to the filter provided in the oil passage. Becomes ON city valve state, the filter is not a cylindrical shape, the engine oil can be achieved by an oil purification device for an internal combustion engine, characterized in that the flow into the cavity of the middle of the cylindrical shape.

  In the above configuration, the filter may have a cylindrical shape, and the engine oil may flow into the central hollow portion of the cylindrical shape.

  According to the present invention, it is possible to suppress the deterioration of the filter.

FIG. 1 is a block diagram illustrating a schematic configuration of an engine including an oil purifying apparatus according to a first embodiment. FIG. 2 is a flowchart showing the control of the ECU. FIG. 3 is a schematic diagram showing the relationship between the oil temperature of the engine oil flowing through the filter and the efficiency of the purification function. FIG. 4A is a diagram showing the control of the ECU, and FIG. 4B is a diagram showing the change in the oil temperature of the engine oil in the oil pan under the control of the ECU. FIG. 5 is a diagram illustrating a positional relationship between the first oil passage and the filter. FIG. 6 is a block diagram illustrating a schematic configuration of an engine including the oil purifying apparatus according to the second embodiment. FIG. 7 is a graph showing the relationship between the engine speed and the engine oil pressure. FIG. 8 is a diagram illustrating a first valve that is a thermostat. FIG. 9 is a diagram illustrating opening and closing of the high temperature thermostat and the low temperature thermostat. FIG. 10 is a block diagram illustrating a schematic configuration of an engine provided with the oil purifying apparatus according to the fourth embodiment. FIG. 11 is a flowchart for explaining the valve states of the first valve to the third valve when the engine oil changes from a low temperature to a high temperature. FIG. 12A shows the oil temperature of the engine oil in the circulating oil passage, the second oil passage, and the third oil passage when the engine oil changes from a low temperature to a high temperature, and FIG. It is a figure which shows the flow volume of the engine oil which flows through a circulation oil path, a 2nd oil path, and a 3rd oil path. FIG. 13 is a flowchart for explaining the valve states of the first valve to the third valve when the engine oil changes from high temperature to low temperature. FIG. 14A shows the oil temperature of the engine oil in the circulating oil passage, the second oil passage, and the third oil passage when the engine oil changes from a high temperature to a low temperature, and FIG. It is a figure which shows the flow volume of the engine oil which flows through a circulation oil path, a 2nd oil path, and a 3rd oil path. Fig.15 (a) is a perspective view of a filter, FIG.15 (b) is sectional drawing. FIG. 16 is a block diagram illustrating a schematic configuration of an engine provided with the oil purifying apparatus according to the first modification of the fourth embodiment. FIG. 17 is a flowchart showing the control of the ECU when the engine oil changes from a low temperature to a high temperature. FIG. 18 is a flowchart showing the control of the ECU when the engine oil changes from a high temperature to a low temperature.

  Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram illustrating a schematic configuration of an engine including an oil purifying apparatus according to a first embodiment. As shown in FIG. 1, the engine 10 includes an oil pan 12, an oil pump 14, an oil cooler 16, engine parts 18 such as a piston and a crankshaft, a radiator 20, a water pump 22, and an oil purification device 24. A circulation oil passage 26 through which engine oil circulates and a water passage 28 through which cooling water flows are provided.

  In the oil pan 12, an inlet of the oil strainer 30 is disposed. The oil strainer 30 is a metal net and functions to remove large foreign matters in the engine oil. The engine oil stored in the oil pan 12 is supplied to each part 18 of the engine after passing through the oil cooler 16 through the circulating oil passage 26 by driving the oil pump 14. The engine oil supplied to each engine part 18 circulates through each engine part 18 and then returns to the oil pan 12. As described above, the oil pan 12 is also an embodiment of the circulating oil passage 26.

  Cooling water is flowing for cooling each part 18 of the engine. Cooling water that has circulated through each part 18 of the engine and has reached a high temperature is sent to the radiator 20 through the water channel 28. The high-temperature cooling water is cooled by the radiator 20, and the cooled cooling water passes through the water passage 28 and passes through the oil cooler 16 or does not pass through the oil cooler 16 by driving the water pump 22. Then, it is supplied to each part 18 of the engine.

  The oil cooler 16 functions to cool, for example, the engine oil by exchanging heat between the engine oil and the cooling water. That is, when high-temperature engine oil is sent to the oil cooler 16, heat exchange is performed with the cooling water sent from the radiator 20 to cool the engine oil, and the cooled engine oil is supplied to each part 18 of the engine. Will come to be.

  Since both engine oil and cooling water are supplied to the engine parts 18, the oil temperature To1 of the engine oil in the oil pan 12 returned from the engine parts 18 and the coolant temperature Tw1 at the outlet of the engine parts 18 are It becomes the locus of the same temperature change. That is, there is a correlation between the oil temperature To1 of the engine oil in the oil pan 12 and the coolant temperature Tw1 of the cooling water at the outlet of each engine unit 18. For this reason, the oil temperature To1 of the engine oil in the oil pan 12 can be obtained by measuring the coolant temperature Tw1 at the outlet of each engine part 18.

  When the engine 10 is cold-started, the oil temperature To1 of the engine oil in the oil pan 12 and the coolant temperature Tw1 of the cooling water at the outlet of each engine part 18 are low. In this case, the oil temperature To2 of the engine oil at the entrance of the oil cooler 16 is lower than the coolant temperature Tw2 at the entrance of the oil cooler 16. Therefore, the oil temperature To3 of the engine oil that has passed through the oil cooler 16 due to heat exchange between the engine oil and the cooling water in the oil cooler 16 is higher than the oil temperature To2 of the engine oil at the entrance of the oil cooler 16. Become.

  On the other hand, when the engine 10 is under a high load, the oil temperature To1 of the engine oil in the oil pan 12 and the coolant temperature Tw1 of the cooling water at the outlet of each engine part 18 are also high. Since the cooling water is cooled by passing through the radiator 20, the cooling water temperature Tw2 at the entrance of the oil cooler 16 is lower than the oil temperature To2 of the engine oil at the entrance of the oil cooler 16. Therefore, the oil temperature To3 of the engine oil that has passed through the oil cooler 16 due to heat exchange between the engine oil and the cooling water in the oil cooler 16 is lower than the oil temperature To2 of the engine oil at the entrance of the oil cooler 16. Become.

  Thus, when the oil temperature To1 of the engine oil in the oil pan 12 is low, the engine oil is warmed by the oil cooler 16, and the oil temperature To3 of the engine oil that has passed through the oil cooler 16 is It becomes higher than the oil temperature To1 of the engine oil. On the other hand, when the oil temperature To1 of the engine oil in the oil pan 12 is high, the engine oil is cooled by the oil cooler 16, and the oil temperature To3 of the engine oil that has passed through the oil cooler 16 is the engine oil in the oil pan 12. It becomes lower than the oil temperature To1.

  The oil purification device 24 includes a filter 32 having a function of purifying oil, a first oil passage 34, a first valve 36 that is, for example, an electromagnetic valve, and an ECU 38 that is a control unit that controls the first valve 36. Have. The filter 32 is provided in the oil pan 12 and includes an ion exchanger such as an ion exchange resin or an inorganic ion exchange resin. When the filter 32 is provided in the oil pan 12, the filter 32 can always be filled with engine oil, and when the filter 32 is replaced, the filter 32 is installed in the circulating oil passage 26. Compared to, it can be easily replaced, and there is no pressure loss. One end of the first oil passage 34 is connected to the circulating oil passage 26 at the downstream side of the oil cooler 16 and the upstream side of the engine parts 18, and the other end is disposed in the oil pan 12 around the filter 32. As a result, the engine oil that has passed through the oil cooler 16 and before flowing through the engine parts 18 can flow into the oil pan 12 around the filter 32 through the first oil passage 34. The first valve 36 is controlled by the ECU 38 to determine whether engine oil that has passed through the oil cooler 16 and before flowing through each part 18 of the engine flows into the oil pan 12 through the first oil passage 34. Change the flow.

  Next, control of the ECU 38 will be described. Control of ECU38 is performed by cooperation with hardware, such as CPU, and the software memorize | stored in ROM. FIG. 2 is a flowchart showing the control of the ECU 38. As shown in FIG. 2, when the engine 10 is started (step S10), the ECU 38 measures the coolant temperature Tw1 at the outlet of each engine unit 18, and the coolant temperature Tw1 is equal to or higher than the first predetermined temperature. It is determined whether the temperature is equal to or lower than the second predetermined temperature (step S12).

  Here, the first predetermined temperature and the second predetermined temperature will be described. FIG. 3 is a schematic diagram showing the relationship between the temperature of the engine oil flowing into the filter 32 and the purification efficiency. As shown in FIG. 3, the purification efficiency is not constant with respect to the oil temperature of the engine oil, but changes according to the oil temperature of the engine oil. For example, the efficiency becomes low when the engine oil is low, and the purification efficiency reaches a peak when the engine oil is at a certain temperature. The filter 32 has a heat resistant limit temperature Tz. For example, when Diaion (registered trademark) manufactured by Mitsubishi Chemical Corporation and the product name WA30 are used as the filter 32, the heat resistant limit temperature Tz is 100 ° C. . In addition to the filter 32, Diaion (registered trademark) manufactured by Mitsubishi Chemical Corporation, product names WA20, WA21J, WA40C, WK10, WK10S, and the like can be used. When the heat-resistant limit temperature Tz is exceeded, the filter 32 is destroyed and performance degradation occurs.

  For example, assuming that the purification efficiency is α% or more and that the predetermined purification efficiency can be exhibited (high efficiency state), the engine oil temperature is set to the appropriate temperature range X in order to achieve the purification efficiency of α% or more. Must be within. That is, when the lower limit temperature of the appropriate temperature range X is Ta and the upper limit temperature is Tb, the oil temperature of the engine oil needs to be set to the lower limit temperature Ta or higher and the upper limit temperature Tb or lower. In other words, when the oil temperature of the engine oil is lower than the lower limit temperature Ta and higher than the upper limit temperature Tb, the purification efficiency becomes smaller than α%, and the low efficiency state is brought about.

  Since the filter 32 is provided in the oil pan 12, in order to increase the purification efficiency, the oil temperature To1 of the engine oil in the oil pan 12 is set to the lower limit temperature Ta or higher and the upper limit temperature Tb or lower. Good. As described above, there is a correlation between the oil temperature To1 of the engine oil in the oil pan 12 and the coolant temperature Tw1 of the cooling water at the outlet of each engine unit 18. For this reason, when the oil temperature To1 of the engine oil in the oil pan 12 becomes the lower limit temperature Ta and the upper limit temperature Tb, the coolant temperature Tw1 at the outlet of each engine part 18 can be determined. The coolant temperature Tw1 at the outlet of each engine 18 when the oil temperature To1 of the engine oil in the oil pan 12 reaches the lower limit temperature Ta is set as a first predetermined temperature. Further, the coolant temperature Tw1 at the outlet of each engine section 18 when the oil temperature To1 of the engine oil in the oil pan 12 reaches the upper limit temperature Tb is set as the second predetermined temperature.

  Therefore, when the coolant temperature Tw1 at the outlet of each engine part 18 is equal to or higher than the first predetermined temperature and equal to or lower than the second predetermined temperature, the oil temperature To1 of the engine oil in the oil pan 12 is It will be in the appropriate temperature range X where predetermined purification efficiency can be exhibited. In other words, when the coolant temperature Tw1 at the outlet of each engine part 18 is lower than the first predetermined temperature and higher than the second predetermined temperature, the oil temperature To1 of the engine oil in the oil pan 12 is filtered. 32 is in a temperature range out of the proper temperature range X where predetermined purification efficiency can be exhibited.

  Returning to FIG. 2, when the coolant temperature Tw1 at the outlet of each part 18 of the engine is not lower than the first predetermined temperature and not lower than the second predetermined temperature (No in step S12), the ECU 38 opens the first valve 36. (Step S14). As a result, the engine oil that has passed through the oil cooler 16 and before flowing through the engine parts 18 passes through the first oil passage 34 and flows into the oil pan 12 around the filter 32.

  When the coolant temperature Tw1 at the outlet of each engine part 18 is lower than the first predetermined temperature, the oil temperature To1 of the engine oil in the oil pan 12 is lower than the lower limit temperature Ta. When the oil temperature To1 of the engine oil in the oil pan 12 is low, such as when the engine 10 is cold started, the oil temperature To3 of the engine oil at the outlet of the oil cooler 16 is set in the oil pan 12 as described above. It becomes higher than the oil temperature To1 of the engine oil. For this reason, when the coolant temperature Tw1 at the outlet of each engine section 18 is lower than the first predetermined temperature, the first valve 36 is opened, so that the engine oil warmed by the oil cooler 16 is removed from the periphery of the filter 32. The oil can be introduced into the oil pan 12. Thereby, the oil temperature of the engine oil flowing into the filter 32 can be promoted to be within the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency.

  On the other hand, when the coolant temperature Tw1 at the outlet of each engine 18 is higher than the second predetermined temperature, the oil temperature To1 of the engine oil in the oil pan 12 is higher than the upper limit temperature Tb. When the oil temperature To1 of the engine oil in the oil pan 12 is high, the oil temperature To3 of the engine oil at the outlet of the oil cooler 16 is higher than the oil temperature To1 of the engine oil in the oil pan 12 as described above. Lower. For this reason, when the coolant temperature Tw1 at the outlet of each engine part 18 is higher than the second predetermined temperature, the first valve 36 is opened, so that the engine oil cooled by the oil cooler 16 is removed from the periphery of the filter 32. The oil can be introduced into the oil pan 12. Thereby, the oil temperature of the engine oil flowing into the filter 32 can be promoted to be within the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency.

  Next, the ECU 38 determines whether or not the coolant temperature Tw1 at the outlet of each engine section 18 has become equal to or higher than the first predetermined temperature and equal to or lower than the second predetermined temperature (step S16). When the coolant temperature Tw1 at the outlet of each engine section 18 is not lower than the first predetermined temperature and not higher than the second predetermined temperature (Yes in steps S12 and S16), the ECU 38 closes the first valve 36. (Step S18). As a result, the engine oil that has passed through the oil cooler 16 and has not yet flowed through the engine parts 18 does not flow into the oil pan 12 through the first oil passage 34.

  Next, the ECU 38 determines whether or not the coolant temperature Tw1 at the outlet of each engine unit 18 has become higher than the second predetermined temperature (step S20). When it is determined that the temperature has become higher than the second predetermined temperature (in the case of Yes), the ECU 38 opens the first valve 36 (step S22). As a result, as described above, the engine oil cooled by the oil cooler 16 flows into the oil pan 12 around the filter 32.

  Next, the ECU 38 determines whether or not the coolant temperature Tw1 at the outlet of each engine unit 18 has become equal to or lower than the second predetermined temperature (step S24), and determines that the temperature has become equal to or lower than the second predetermined temperature (Yes) ), The first valve 36 is closed (step S26).

  FIG. 4A is a diagram showing the control of the ECU 38. FIG. 4B is a diagram showing a change in the oil temperature To1 of the engine oil in the oil pan 12 under the control of the ECU 38. As shown in FIG. 4A, when the coolant water temperature Tw1 at the outlet of each part 18 of the engine is lower than the first predetermined temperature, the ECU 38 opens the first valve 36. As a result, as shown in FIG. 4B, the oil temperature To1 of the engine oil can be promoted to be not less than the lower limit temperature Ta and not more than the upper limit temperature Tb. As shown in FIG. 4A, when the coolant temperature Tw1 becomes equal to or higher than the first predetermined temperature and equal to or lower than the second predetermined temperature, the ECU 38 closes the first valve 36. This is because there is no need to open the first valve 36 because the oil temperature To1 in the oil pan 12 is within the appropriate temperature range X, and the first valve 36 is closed and the engine parts 18 are closed. This is to increase the amount of engine oil supplied. Thereafter, when the coolant temperature Tw1 becomes higher than the second predetermined temperature, the ECU 38 opens the first valve 36. As a result, as shown in FIG. 4B, the oil temperature To1 of the engine oil can be promoted to be not less than the lower limit temperature Ta and not more than the upper limit temperature Tb.

  According to the first embodiment, as shown in FIG. 1, the oil is connected to the circulating oil passage 26 downstream of the oil cooler 16 and upstream of the engine parts 18, passes through the oil cooler 16, and flows through the engine parts 18. A first oil passage 34 is provided so that the previous engine oil can flow into the oil pan 12 around the filter 32. Then, the ECU 38 determines that the oil temperature To1 of the engine oil in the oil pan 12 is outside the proper temperature range X in which the filter 32 can exhibit a predetermined purification efficiency (when lower than the lower limit temperature Ta or higher than the upper limit temperature Tb). ), The first valve 36 is opened so that the engine oil that has passed through the oil cooler 16 and before flowing through each part 18 of the engine flows into the oil pan 12 around the filter 32. That is, the flow of engine oil toward the filter 32 so that the oil temperature of the engine oil flowing into the filter 32 provided in the oil pan 12 is within an appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency. To change. Thereby, it is possible to suppress the engine oil having an oil temperature outside the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency from flowing through the filter 32. Therefore, it is possible to prevent ions or the like initially attached to the filter 32 from flowing into the engine oil in vain.

  Further, according to the first embodiment, as shown in FIG. 3, by setting the purification efficiency α% of the filter 32 appropriately, the upper limit temperature Tb of the engine oil temperature at which the purification efficiency becomes α% or more is It becomes lower than the heat resistant limit temperature Tz of the filter 32. Therefore, by performing the control shown in the first embodiment, it is possible to prevent the oil temperature of the engine oil flowing through the filter 32 from becoming higher than the heat resistant limit temperature Tz. Therefore, it is possible to suppress the destruction of the filter 32 and the deterioration of characteristics due to the high-temperature engine oil flowing through the filter 32.

  FIG. 5 is a diagram illustrating a positional relationship between the first oil passage 34 and the filter 32. As shown in FIG. 5, the filter 32 has a cylindrical shape having a hollow portion 40 in the center. The end of the first oil passage 34 is located in the cavity 40, and the engine oil that has flowed through the first oil passage 34 flows into the cavity 40. As a result, the engine oil that has passed through the oil cooler 16 can flow into the filter 32 more directly. Further, engine oil is ejected radially from the first oil passage 34. Since the engine oil is ejected radially, the engine oil periodically flows through the entire filter 32, and clogging of the filter 32 can be suppressed.

  In the first embodiment, the ECU 38 controls the first valve 36 based on the coolant temperature Tw1 discharged from each part 18 of the engine having a correlation with the oil temperature To1 of the engine oil in the oil pan 12. It is not necessarily limited to. The ECU 38 may control the first valve 36 according to other parameters as long as it can control the first valve 36 based on the oil temperature To1 of the engine oil in the oil pan 12.

  FIG. 6 is a block diagram illustrating a schematic configuration of an engine including the oil purifying apparatus according to the second embodiment. As shown in FIG. 6, the oil purification device 24 includes a filter 32, a first oil passage 34, and a first valve 36 that is, for example, a relief valve that opens and closes according to the hydraulic pressure. The first valve 36 is automatically opened and closed according to the oil pressure of the engine oil flowing through the circulating oil passage 26. The other configuration is the same as that of the first embodiment and is shown in FIG.

  FIG. 7 is a graph showing the relationship between the engine speed and the engine oil pressure. As shown in FIG. 7, even when the engine oil temperature is 0 ° C., 20 ° C., 40 ° C., or 50 ° C., the oil pressure of the engine oil increases as the engine speed increases. To do. Further, the lower the engine oil temperature, the higher the oil pressure of the engine oil when the engine speed is constant. Even when the engine speed is high and the engine oil is hot, the oil pressure of the engine oil is high. For these reasons, when the oil temperature To1 of the engine oil is low, the oil pressure of the engine oil flowing through the circulation oil passage 26 is high. Even when the engine speed is high and the oil temperature To1 of the engine oil is high, the oil pressure of the engine oil flowing through the circulating oil passage 26 is high.

  Therefore, the engine oil before passing through the oil cooler 16 and flowing through each part 18 of the engine depending on the set value of the opening hydraulic pressure of the first valve 36 depending on whether the oil temperature To1 of the engine oil is low or high. Can flow into the oil pan 12 around the filter 32. That is, the oil pressure of the engine oil flowing into the filter 32 is set by appropriately setting the hydraulic pressure at which the first valve 36 opens based on the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency. The flow of engine oil toward the filter 32 can be changed so that the temperature 32 is within an appropriate temperature range X that can exhibit a predetermined purification efficiency.

  In the second embodiment, the case where the first valve 36 is a relief valve that opens and closes according to the oil pressure of the engine oil has been described, but even in this case, the first valve 36 flows into the filter 32 provided in the oil pan 12. The oil temperature of the engine oil can be promoted to be within an appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency. Therefore, it is possible to prevent the engine oil having an oil temperature outside the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency from flowing through the filter 32, and the filter 32 due to the high-temperature engine oil flowing through the filter 32. Destruction and characteristic deterioration can be suppressed.

  When the engine is running at a high speed, even if the oil temperature of the engine oil is within the appropriate temperature range X, the oil pressure of the engine oil becomes high and the first valve 36 may open. Even in this case, when the engine is running at high speed, the oil temperature of the engine oil tends to rise. Therefore, when the first valve 36 is opened, the engine oil cooled by the oil cooler 16 is oiled. The oil temperature of the engine oil that flows into the pan 12 and flows into the filter 32 can be promoted to be within an appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency.

  Further, a general oil pump is provided with a relief valve for controlling the hydraulic pressure in order to prevent the hydraulic pressure of the engine oil from increasing excessively. For example, when the engine oil is at a low temperature, the hydraulic pressure is high, and therefore the increase in the hydraulic pressure is suppressed by the relief valve. Thus, in a general oil pump, when the engine oil is at a low temperature, part of the work performed by the oil pump is wasted. However, as in the second embodiment, by using the first valve 36 as a relief valve, an increase in engine oil pressure can be suppressed without providing a relief valve in the oil pump 14, and the released engine oil Since the temperature of the engine oil flowing into the oil pan 12 around the filter 32 is set within the appropriate temperature range X, it is possible to prevent the work performed by the oil pump from being wasted.

  The oil purifying apparatus according to the third embodiment is an example in which the first valve 36 is a thermostat. Except that the first valve 36 is a thermostat, it is the same as that of the second embodiment and is shown in FIG.

  FIG. 8 is a diagram illustrating the first valve 36 that is a thermostat. As shown in FIG. 8, the first valve 36 includes a high temperature thermostat 46 and a low temperature thermostat 48. The high temperature thermostat 46 and the low temperature thermostat 48 have a thermo temperature sensing part 50, and a branch oil path 52 branched from the circulation oil path 26 is disposed above the thermo temperature sensing part 50. As a result, the oil temperature To3 of the engine oil that has passed through the oil cooler 16 can be sensed by the thermo-temperature sensing unit 50, and based on the oil temperature To3 of the engine oil that has passed through the oil cooler 16, the high temperature thermostat 46 and The thermostat 48 for low temperature opens and closes.

  By selecting the wax melting temperature of the high temperature thermostat 46 and the low temperature thermostat 48, the high temperature thermostat 46 and the low temperature thermostat 48 can be set to open at desired temperatures, respectively. For example, the thermostat 46 for high temperature is set so that the oil temperature To3 of the engine oil that has passed through the oil cooler 16 opens at a temperature higher than the temperature Td determined based on the upper limit temperature Tb. The low temperature thermostat 48 is set so that the oil temperature To3 of the engine oil that has passed through the oil cooler 16 opens at a temperature lower than the temperature Tc determined based on the lower limit temperature Ta.

  FIG. 9 is a view for explaining opening and closing of the high temperature thermostat 46 and the low temperature thermostat 48. As shown in FIG. 9, when the oil temperature To3 of the engine oil that has passed through the oil cooler 16 is lower than the temperature Tc, the low-temperature thermostat 48 is opened, and the engine oil warmed by the oil cooler 16 becomes the oil pan around the filter 32. 12 flows in. When the oil temperature To3 of the engine oil that has passed through the oil cooler 16 is not less than the temperature Tc and not more than the temperature Td, both the high-temperature thermostat 46 and the low-temperature thermostat 48 are closed to pass through the oil cooler 16 and the engine parts. The engine oil before flowing through 18 does not flow into the oil pan 12. When the oil temperature To3 of the engine oil that has passed through the oil cooler 16 becomes higher than the temperature Td, the high-temperature thermostat 46 opens, and the engine oil cooled by the oil cooler 16 flows into the oil pan 12 around the filter 32.

  Thus, in the third embodiment, the first valve 36 is a thermostat that opens and closes based on the temperature To3 of the engine oil that has passed through the oil cooler 16. This also facilitates the oil temperature of the engine oil flowing into the filter 32 provided in the oil pan 12 to be within the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency. Therefore, it is possible to prevent the engine oil having an oil temperature outside the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency from flowing through the filter 32, and the filter 32 due to the high-temperature engine oil flowing through the filter 32. Destruction and characteristic deterioration can be suppressed. Moreover, by using the first valve 36 as a thermostat, the cost is superior to the first embodiment in which the electromagnetic valve is used and the second embodiment in which the relief valve is used.

  FIG. 10 is a block diagram illustrating a schematic configuration of an engine provided with the oil purifying apparatus according to the fourth embodiment. As shown in FIG. 10, the engine 10 includes an oil pan 12, an oil pump 14, an oil filter 54, engine parts 18 such as a piston and a crankshaft, an oil purification device 24, and a circulating oil path 26 through which engine oil flows. And having.

  In the oil pan 12, an inlet of the oil strainer 30 is disposed. The engine oil stored in the oil pan 12 passes through the circulating oil path 26 and the oil filter 54 and / or the oil purifier 24 by driving the oil pump 14, and then to the engine parts 18. Supplied. The engine oil supplied to each engine part 18 circulates through each engine part 18 and then returns to the oil pan 12.

  The oil filter 54 is formed by layering and folding filter papers such as non-woven fabrics and removes metal powder and dirt in the engine oil.

  The oil purification device 24 includes a second oil passage 60, a third oil passage 64, a filter 32, a first valve 36, a second valve 70, and a third valve 72. The second oil passage 60 branches from the circulation oil passage 26 at the branch portion 56, and joins the circulation oil passage 26 at the junction portion 62 on the downstream side of the branch portion 56. Here, the circulating oil passage 26 between the branching portion 56 and the merging portion 62 is represented as a circulating oil passage 26a. The filter 32 is provided in the second oil passage 60. The third oil passage 64 is provided so as to bypass the filter 32, and is connected to the second oil passage 60 through the first connection portion 66 and the second connection portion 68. The first connection portion 66 is located on the upstream side with respect to the second connection portion 68.

  The first valve 36, the second valve 70, and the third valve 72 are, for example, thermostats, and are automatically opened and closed according to the oil temperature of the flowing engine oil. The first valve 36 is provided at the branch portion 56. The second valve 70 is provided in the first connection portion 66. The third valve 72 is provided in the third oil passage 60 on the downstream side of the filter 32 and on the upstream side of the second connection portion 68. Note that the first valve 36 may be provided in the junction 62.

  Hereinafter, the open / close state of the first valve 36 will be described using a1 to a3. For example, when the first valve 36 is a1-a2 opened and a1-a3 closed, the engine oil flows to the circulating oil passage 26a side. In the case of a1-a2 valve closing and a1-a3 valve opening, engine oil flows to the second oil passage 60 side. In the case of the a1-a2 and a1-a3 half-open valves, the engine oil flows in both the circulating oil passage 26a side and the second oil passage 60 side.

  Similarly, the open / close state of the second valve 70 will be described using b1 to b3. For example, when the second valve 70 is b1-b2 open and b1-b3 closed, the engine oil flows to the third oil passage 64 side. In the case of b1-b2 valve closing and b1-b3 valve opening, the engine oil flows to the second oil passage 60 side where the filter 32 is provided.

  Similarly, the open / close state of the third valve 72 will be described using c1 and c2. For example, when the third valve 72 is c1-c2 open, the engine oil flows through the second oil passage 60, and when the third valve 72 is c1-c2 closed, the engine oil does not flow through the second oil passage 60.

  FIG. 11 is a flowchart for explaining the valve states of the first valve 36 to the third valve 72 when the engine oil changes from low temperature to high temperature. As shown in FIG. 11, when the oil temperature of the engine oil is lower than Ta + x, which is a temperature higher than the lower limit temperature Ta of the appropriate temperature range X by a correction amount x (Yes in step S30), the first valve 36 is a1−. a2, a1-a3 half-open, the second valve 70 is b1-b2 open, b1-b3 is closed, and the third valve 72 is c1-c2 open (step S32). Thus, when the oil temperature of the engine oil is lower than Ta + x, the engine oil flows through the circulation oil passage 26a and the third oil passage 64 and does not flow into the filter 32.

  When the oil temperature of the engine oil becomes equal to or higher than Ta + x (Yes in step S34), the first valve 36 is a1-a2, a1-a3 half-open, the second valve 70 is b1-b2 closed, b1- The b3 valve opening and the third valve 72 are c1-c2 valve opening (step S36). As a result, when the oil temperature of the engine oil becomes equal to or higher than Ta + x, the engine oil flows through the circulation oil passage 26a and the second oil passage 60. That is, the engine oil flows into the filter 32.

  When the oil temperature of the engine oil becomes higher than Tb-x, which is a temperature lower than the upper limit temperature Tb of the appropriate temperature range X by the correction amount x (Yes in step S38), the first valve 36 opens a1-a2. The valve, a1-a3 valve closing, the second valve 70 is b1-b2 valve closing, the b1-b3 valve opening, and the third valve 72 are c1-c2 valve closing (step S40). As a result, when the oil temperature of the engine oil becomes equal to or higher than Tb−x, the engine oil flows only through the circulation oil passage 26 a and does not flow through the filter 32.

  FIG. 12A shows the oil temperature of the engine oil in the circulating oil passage 26, the second oil passage 60, and the third oil passage 64 upstream from the branching portion 56 when the engine oil changes from a low temperature to a high temperature. Indicates. When the oil temperature of the engine oil is lower than Ta + x as shown in FIG. 12A, the engine oil flows through the circulation oil passage 26a and the third oil passage 64 as described in step S32 of FIG. Therefore, the oil temperature of the engine oil flowing through the third oil passage 64 rises in the same manner as the oil temperature of the circulating oil passage 26 upstream from the branch portion 56. When the oil temperature of the engine oil becomes equal to or higher than Ta + x, the engine oil flows through the circulation oil passage 26a and the second oil passage 60 and does not flow through the third oil passage 64 as described in step S36 of FIG. Since no valve is provided on the downstream side of the third oil passage 64, engine oil does not stay in the third oil passage 64. Therefore, the oil temperature of the engine oil in the third oil passage 64 is zero. Thereafter, when the oil temperature of the engine oil becomes higher than Tb-x, the engine oil flows only through the circulating oil passage 26a as described in step S40 of FIG. There is a third valve 72 downstream of the second oil passage 60, and the third valve 72 is in a c1-c2 valve closed state. For this reason, the engine oil flowing in the second oil passage 60 stays as it is, and the oil temperature of the engine oil in the second oil passage 60 does not rise above Tb−x.

  FIG. 12B shows the flow rate of the engine oil flowing through the circulating oil passage 26, the second oil passage 60, and the third oil passage 64 upstream from the branching portion 56 when the engine oil changes from low temperature to high temperature. Show. FIG. 12B shows the state after the oil temperature of the engine oil becomes equal to or higher than Ta + x, and after step S36 of FIG. 11 is executed, the engine oil flows through the circulation oil passage 26a and the second oil passage 60. ing. As shown in FIG. 12B, after step S36 of FIG. 11 is executed, the engine oil flows through the circulation oil passage 26a and the second oil passage 60, but does not flow through the third oil passage 64. That is, the flow rate of the engine oil flowing through the third oil passage 64 is zero. After that, when the oil temperature of the engine oil becomes higher than Tb-x, the engine oil flows only through the circulation oil passage 26a as described in Step S40 of FIG. 11, and enters the second oil passage 60 and the third oil passage 64. Therefore, the flow rate of the engine oil flowing through the second oil passage 60 and the third oil passage 64 is zero. At this time, since the engine oil that has flowed through the filter 32 does not flow through the filter 32, the pressure load on the flow of the engine oil is weakened, and the flow rate of the engine oil that flows through the circulating oil path 26 upstream from the branch portion 56 increases. To do. In addition, the dashed-two dotted line in FIG.12 (b) has shown the appropriate flow range, and has shown that the flow volume of the engine oil which flows through the 2nd oil path 60 is in the appropriate flow range. If the flow rate is out of the proper flow range, an excessive flow rate of engine oil may flow into the filter 32 and the parts may be damaged, or the efficiency of the purification function in the filter 32 may be reduced due to the insufficient flow rate.

  Next, the state of the first valve 36 to the third valve 72 when the engine oil changes from high temperature to low temperature will be described using the flowchart of FIG. As shown in FIG. 13, when the oil temperature of the engine oil is higher than Tb-x (Yes in step S50), the first valve 36 is a1-a2 opened, the a1-a3 valve is closed, and the second valve 70 is The b1-b2 valve closing, the b1-b3 valve opening, and the third valve 72 are c1-c2 valve closing (step S52).

  When the oil temperature of the engine oil is equal to or lower than Tb-x (Yes in step S54), the first valve 36 is a1-a2, a1-a3 half-open, the second valve 70 is b1-b2 closed, b1 -B3 valve opening and the 3rd valve 72 become c1-c2 valve opening (step S56).

  When the oil temperature of the engine oil is lower than Ta + x (Yes in step S58), the first valve 36 is a1-a2, a1-a3 half-open, the second valve 70 is b1-b2, and b1- The b3 valve closing and the third valve 72 are c1-c2 valve opening (step S60).

  FIG. 14A shows the oil temperature of the engine oil in the circulating oil passage 26, the second oil passage 60, and the third oil passage 64 upstream from the branching portion 56 when the engine oil changes from a high temperature to a low temperature. Indicates. As shown in FIG. 14 (a), when the oil temperature of the engine oil is higher than Tb-x, the engine oil flows through the circulation oil passage 26a as described in step S52 of FIG. It does not flow into the third oil passage 64. Since the third valve 72 is c1-c2 closed, the engine oil stays in the second oil passage 60, and the engine oil in the second oil passage 60 is at a low temperature. On the other hand, since no valve is provided on the downstream side of the third oil passage 64, the engine oil does not stay in the third oil passage 64, and the oil temperature of the engine oil becomes zero. Thereafter, when the oil temperature of the engine oil becomes equal to or lower than Tb−x, the engine oil flows through the circulating oil passage 26a and the second oil passage 60 as described in step S56 of FIG. For this reason, the oil temperature of the engine oil in the second oil passage 60 rises, and becomes equal to the oil temperature of the engine oil in the circulating oil passage 26 upstream from the branch portion 56.

  FIG. 14B shows the flow rate of the engine oil flowing through the circulating oil passage 26, the second oil passage 60, and the third oil passage 64 upstream from the branching portion 56 when the engine oil changes from high temperature to low temperature. Indicates. As shown in FIG. 14B, when the oil temperature of the engine oil is higher than Tb-x, the engine oil flows only through the circulation oil passage 26a as described in step S52 of FIG. Since it does not flow to the third oil passage 64, the flow rate of the engine oil flowing through the second oil passage 60 and the third oil passage 64 is zero. Thereafter, when the oil temperature of the engine oil becomes equal to or lower than Tb-x, the engine oil flows through the circulation oil passage 26a and the second oil passage 60 as described in Step S56 of FIG. It does not flow. At this time, since the engine oil flows through the second oil passage 60, the pressure load increases through the filter 32, and the flow rate of the engine oil in the circulating oil passage 26 upstream from the branch portion 56 decreases.

  According to the fourth embodiment, the second oil passage 60 branched from the circulation oil passage 26 and provided with the filter 32 and the third oil passage 64 bypassing the filter 32 are provided. The second valve 70 switches whether engine oil flows through the second oil passage 60 or the third oil passage 64 provided with the filter 32. The material for the first valve 36 and the second valve 70 is appropriately selected, and the first valve 36 and the second valve 70 are selected so that the oil temperature of the engine oil is suitable for the filter 32 to exhibit a predetermined purification efficiency. When outside the range X, the engine oil does not flow into the filter 32 provided in the second oil passage 60. Accordingly, it is possible to suppress the engine oil having an oil temperature outside the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency from flowing through the filter 32, and the filter 32 due to the high-temperature engine oil flowing through the filter 32. Destruction and characteristic deterioration can be suppressed.

  FIG. 15A is a perspective view of the filter 32. As shown in FIG. 15A, the cylindrical filter 32 is provided on the inner wall of the cylindrical metal surface 76. When engine oil flows into the central cavity 40 of the cylindrical filter 32, the concentration distribution of adsorbed ions in which impurity ions in the engine oil are adsorbed by a chemical reaction such as ion exchange is determined from the engine oil inlet to the outlet. (The mesh portion in FIG. 15A). Thereby, impurities in engine oil can be effectively reduced.

  FIG. 15B is a schematic cross-sectional view of the filter 32. As shown in FIG. 15B, the filter 32 provided on the metal surface 76 immobilizes an ion exchanger 80 or porous beads bonded with a resin binder such as foamed urethane, vinyl chloride, or urethane. An ion exchanger 80 and a mesh 82 such as a fibrous net or a metal wire net. The mesh 82 is provided so that the ion exchanger 80 does not leak out.

  FIG. 16 is a block diagram illustrating a schematic configuration of an engine provided with the oil purifying apparatus according to the first modification of the fourth embodiment. As shown in FIG. 16, in the first modification of the fourth embodiment, the first valve 36, the second valve 70, and the third valve 72 included in the oil purification device 24 are electromagnetic valves, and the first valve 36, the second valve 70 and an ECU 38 which is a control unit for controlling the third valve 72. The other configuration is the same as that of the fourth embodiment and is shown in FIG.

  FIG. 17 is a flowchart showing the control of the ECU 38 when the engine oil changes from a low temperature to a high temperature. Control of ECU38 is performed by cooperation with hardware, such as CPU, and the software memorize | stored in ROM. As shown in FIG. 17, the ECU 38 determines whether the oil temperature of the engine oil in the circulating oil passage 26 upstream from the branching portion 56 is lower than Ta + x (step S70). The first valve 36 is a1-a2 opened, the a1-a3 valve is closed, the second valve 70 is b1-b2 opened, the b1-b3 valve is closed, and the third valve 72 is c1-c2 closed (step S72). . As a result, when the oil temperature of the engine oil is lower than Ta + x, the engine oil flows only through the circulation oil passage 26 a and does not flow through the filter 32.

  Next, the ECU 38 determines whether or not the oil temperature of the engine oil in the circulating oil passage 26 upstream from the branch portion 56 has become Ta + x or higher (step S74), and determines that it has become Ta + x or higher (in the case of Yes), The first valve 36 is a1-a2 closed, a1-a3 opened, the second valve 70 is b1-b2 closed, b1-b3 opened, and the third valve 72 is c1-c2 opened (step S76). . As a result, when the oil temperature of the engine oil becomes equal to or higher than Ta + x, the engine oil flows through the second oil passage 60 and the engine oil flows into the filter 32.

  Next, the ECU 38 determines whether the oil temperature of the engine oil in the circulating oil passage 26 upstream from the branching portion 56 has become higher than Tb-x (step S78), and if it has determined that it has become higher than Tb-x (Yes) 1), the first valve 36 is a1-a2 opened, the a1-a3 valve is closed, the second valve 70 is b1-b2 opened, the b1-b3 valve is closed, and the third valve 72 is c1-c2 closed. (Step S80). As a result, when the oil temperature of the engine oil becomes equal to or higher than Tb−x, the engine oil flows only through the circulation oil passage 26 a and does not flow into the filter 32.

  FIG. 18 is a flowchart showing the control of the ECU 38 when the engine oil changes from high temperature to low temperature. As shown in FIG. 18, the ECU 38 determines whether the oil temperature of the engine oil in the circulating oil passage 26 upstream from the branching portion 56 is higher than Tb−x (step S90). ), The first valve 36 is a1-a2 opened, the a1-a3 valve is closed, the second valve 70 is b1-b2 opened, the b1-b3 valve is closed, and the third valve 72 is c1-c2 closed (step) S92).

  Next, the ECU 38 determines whether the oil temperature of the engine oil in the circulating oil passage 26 upstream from the branching portion 56 has become equal to or lower than Tb-x (step S94), and determines that it has become equal to or lower than Tb-x (Yes) In this case, the first valve 36 is a1-a2 closed, a1-a3 opened, the second valve 70 is b1-b2 closed, b1-b3 opened, and the third valve 72 is c1-c2 opened. (Step S96).

  Next, the ECU 38 determines whether the oil temperature of the engine oil in the circulating oil passage 26 upstream from the branching portion 56 has become lower than Ta + x (step S98), and determines that it has become lower than Ta + x (in the case of Yes), The first valve 36 is a1-a2 opened, a1-a3 is closed, the second valve 70 is b1-b2 opened, b1-b3 is closed, and the third valve 72 is c1-c2 closed (step S100). .

  In the first modification of the fourth embodiment, the ECU 38 controls the valve state of the first valve 36 when the oil temperature of the engine oil is outside the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency. Thus, the engine oil is prevented from flowing into the second oil passage 60. Accordingly, it is possible to suppress the engine oil having an oil temperature outside the appropriate temperature range X in which the filter 32 can exhibit a predetermined purification efficiency from flowing through the filter 32, and the filter 32 due to the high-temperature engine oil flowing through the filter 32. Destruction and characteristic deterioration can be suppressed.

  Further, the ECU 38 sets the first valve 36 as the a1-a2 valve opening and the a1-a3 valve closing when the oil temperature of the engine oil is outside the proper temperature range X in which the filter 32 can exhibit the predetermined purification efficiency. The engine oil flows into the third oil passage 64 with the second valve 70 opened as b1-b2 and the b1-b3 closed as the valve state in which the engine oil does not flow into the second oil passage 60 is provided. It is set as the valve state which does not flow into the 2nd oil passage 60 made. Thereby, for example, even when the first valve 36 is broken, a fail-safe mechanism that can prevent the engine oil having an oil temperature outside the appropriate temperature range X from flowing through the filter 32 without delaying the circulation of the engine oil. Have

  In the fourth embodiment and the first modification of the fourth embodiment, the case where the oil purifying device 24 is provided between the oil filter 54 and each engine unit 18 is shown as an example, but the present invention is not limited to this. It may be provided between the oil pan 12 and the oil pump 14 or between the oil pump 14 and the oil filter 54. Moreover, the case where the 3rd oil path 64, the 2nd valve | bulb 70, and the 3rd valve | bulb 72 are not provided may be sufficient. Even in this case, it is possible to suppress the engine oil having the oil temperature outside the appropriate temperature range X in which the filter 32 can exhibit the predetermined purification efficiency from flowing through the filter 32. In the fourth embodiment, when the oil temperature of the engine oil is lower than Ta + x, the case where the first valve 36 is a1-a2, a1-a3 half-open valve has been described. When the valve 70 and the third valve 72 are not provided, when the oil temperature of the engine oil is lower than Ta + x, the first valve 36 is set to be a1-a2 opened and a1-a3 closed. be able to.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible.

DESCRIPTION OF SYMBOLS 10 Engine 12 Oil pan 14 Oil pump 16 Oil cooler 18 Engine parts 20 Radiator 22 Water pump 24 Oil purifier 26 Circulating oil path 28 Water path 30 Oil strainer 32 Filter 34 First oil path 36 First valve 38 ECU
40 Cavity 46 High Temperature Thermostat 48 Low Temperature Thermostat 50 Thermo Temperature Sensing Section 52 Branch Oil Path 54 Oil Filter 56 Branch Section 60 Second Oil Path 62 Merging Section 64 Third Oil Path 66 First Connection Portion 68 Second Connection Portion 70 Second valve 72 Third valve 76 Metal surface 80 Ion exchanger 82 Mesh

Claims (8)

A filter that is disposed in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a purification efficiency that changes in accordance with an oil temperature of the engine oil flowing in;
Oil temperature of the engine oil flowing into the filter, the filter so is within the temperature range capable of exhibiting a predetermined said purification efficiency, and Luba Lube change the flow of the engine oil toward the filter,
The engine oil connected to the circulating oil path downstream from the oil cooler provided in the circulating oil path and upstream from each part of the engine, the engine oil before passing through the oil cooler and flowing through the engine parts, An oil passage allowing the oil to flow into an oil pan provided with a filter,
When the oil temperature of the engine oil is out of a temperature range in which the filter can exhibit the predetermined purification efficiency, the valve passes through the oil cooler and the engine oil before flowing through each part of the engine is An oil purifying device for an internal combustion engine, characterized by being in a valve state of flowing into an oil pan . A control unit for controlling the pre tusk Lube,
Wherein the control unit, the oil temperature of the engine oil in said oil pan, if the filter is outside the temperature range capable of exhibiting the predetermined purification efficiency, the pre Kiba lube, and passes through the oil cooler oil purification system of an internal combustion engine according to claim 1, wherein the engine oil before flowing through the various parts of the engine is characterized in that the valve state flowing into the oil pan. Before Kiba Lube the oil purification device for an internal combustion engine according to claim 1, characterized in that a relief valve which opens and closes in response to hydraulic pressure of the engine oil. 2. The oil purification apparatus for an internal combustion engine according to claim 1, wherein the valve is a thermostat . A filter that is disposed in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a purification efficiency that changes in accordance with an oil temperature of the engine oil flowing in;
A valve that changes a flow of the engine oil toward the filter so that an oil temperature of the engine oil flowing into the filter is within a temperature range in which the filter can exhibit the predetermined purification efficiency;
Branching into the circulating oil passage at a branching portion, and joining the circulating oil passage at a joining portion downstream of the branching portion , and an oil passage provided with the filter ,
Before Kiba Lube is a thermostat, the oil temperature of the engine oil, if the filter is outside the temperature range capable of exhibiting the predetermined conversion efficiency, that the engine oil is provided in front Symbol oil passage An oil purifying device for an internal combustion engine, wherein the valve is in a state of not flowing into the filter. A filter that is disposed in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a purification efficiency that changes in accordance with an oil temperature of the engine oil flowing in;
A first valve that changes a flow of the engine oil toward the filter so that an oil temperature of the engine oil flowing into the filter is within a temperature range in which the filter can exhibit the predetermined purification efficiency;
Branching to the circulating oil passage at a branching portion, joining the circulating oil passage at a joining portion downstream of the branching portion, and an oil passage provided with the filter;
A bypass oil passage that bypasses the filter;
The engine oil, and a second valve for switching whether or flowing before Symbol oil passage the filter is provided through the bypass oil passage,
A control unit for controlling the first valve and the second valve;
Wherein the control unit, the oil temperature of the engine oil, if the filter is outside the temperature range capable of exhibiting the predetermined purification efficiency, the first valve, the engine oil does not flow prior SL oil passage valve while the state, the second valve, the engine oil flows into the bypass fluid passage, the oil cleaning of an internal combustion engine, characterized in that the valve state of not flowing before Symbol oil passage the filter is provided apparatus. A filter that is disposed in a circulating oil passage through which engine oil circulates, has a function of purifying the engine oil, and has a purification efficiency that changes in accordance with an oil temperature of the engine oil flowing in;
A valve that changes a flow of the engine oil toward the filter so that an oil temperature of the engine oil flowing into the filter is within a temperature range in which the filter can exhibit the predetermined purification efficiency;
Branching into the circulating oil passage at a branching portion, and joining the circulating oil passage at a joining portion downstream of the branching portion, and an oil passage provided with the filter,
The valve is in a valve state in which the engine oil does not flow into the filter provided in the oil passage when the oil temperature of the engine oil is out of a temperature range in which the filter can exhibit the predetermined purification efficiency. Become
The internal combustion engine oil purifier according to claim 1, wherein the filter has a cylindrical shape, and the engine oil flows into a central hollow portion of the cylindrical shape. The internal combustion engine oil purifier according to any one of claims 1 to 6 , wherein the filter has a cylindrical shape, and the engine oil flows into a central hollow portion of the cylindrical shape.

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