JP2008169786A - Engine cooling system, engine cooling medium, and additive for cooling medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine cooling system which excellently reduces a turbulence frictional resistance and a pressure loss while reducing an environmental load. <P>SOLUTION: This engine cooling system is constructed to cool down an engine by circulating liquid cooling medium through a circulation path by means of a pump. In this engine cooling system, the cooling medium contains an additive consisting of solid particles. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an engine cooling system configured to cool an engine by circulating a liquid cooling medium in a circulation path by a pump. The present invention also relates to a liquid engine cooling medium that cools the engine by circulating in the circulation path. Furthermore, the present invention relates to a coolant additive that is added to the engine coolant.

  As this type of device, for example, a vehicle engine cooling system described in Japanese Patent Application Laid-Open No. 11-153031 is known. This system includes a main circuit and a sub circuit.

  The main circulation path is configured to circulate coolant between the radiator and the water jacket of the engine, and can be opened and closed by a thermostat. The secondary circulation path is configured to circulate the coolant between the water jacket and the heater core. A water-soluble polymer additive (polyethylene oxide or the like) having a linear spiral structure is added to the water-based coolant.

  In this system, the coolant, which is an aqueous solution of linear additive molecules, circulates in each circuit by the operation of a water pump. At this time, the pressure loss in each circulation path is reduced by the addition of the polymer additive. Thereby, the load of the water pump is reduced.

The reduction in pressure loss is due to the fact that each of the additive molecules is directed in the coolant flow direction, thereby reducing the generation of turbulent flow in each circulation path and reducing the turbulent frictional resistance of the coolant. It is considered to be a thing (Toms effect).
Japanese Patent Laid-Open No. 11-153031

  In the conventional system described above, as described in JP-A No. 11-153031, the additive molecules are likely to be chemically deteriorated by oxidation.

  For this reason, it is necessary to further add an antioxidant or regularly replenish the additive. Further, in the coolant, a deteriorated material generated by oxidizing the additive molecule remains. Such an increase in concentration due to the replenishment of the additive and the presence of the deteriorating substance and the antioxidant cause an environmental burden when the coolant is discarded.

  The present invention provides an engine cooling system that can satisfactorily reduce turbulent frictional resistance and pressure loss while suppressing environmental loads.

  The engine cooling system of the present invention (hereinafter simply referred to as “cooling system”) is configured to cool the engine by circulating a liquid cooling medium in a circulation path by a pump. That is, the cooling system includes the engine, the cooling medium, and a cooling medium circulation device.

  The cooling medium circulation device includes the pump and each part (member) described later. Furthermore, the cooling medium circulating system and the electronic control unit that controls the cooling medium circulating apparatus constitute a cooling medium operating system according to the present invention.

  The engine cooling medium (hereinafter simply referred to as “cooling medium”) of the present invention is in a liquid state and can circulate in the circulation path to cool the engine. The additive for cooling medium of the present invention is a substance added to the cooling medium.

  A feature of the present invention is that the cooling medium contains an additive composed of solid particles. That is, the coolant additive (the additive) of the present invention is composed of a substance that maintains the state of solid particles in the coolant. This additive may be composed of, for example, a fiber made of a synthetic resin (polymer).

  In this configuration, the addition of the additive reduces the generation of vortex near the wall surface of the circulation path. Thereby, turbulent frictional resistance is reduced. Here, the additive maintains a solid state relatively stably in the liquid cooling medium. Therefore, the effect of reducing the turbulent frictional resistance as described above can be stably obtained. In addition, the necessity of replenishing the additive due to deterioration can be alleviated.

  Also, the separation of the liquid cooling medium and the solid additive is relatively easier than in the case of the conventional system described above. Therefore, the environmental load at the time of discarding the cooling medium can be well suppressed. Furthermore, it is relatively easier to collect (collect) the additive in the cooling medium than in the case of the above-described conventional system. Therefore, it becomes easy to reduce the addition amount of the additive according to the operating state of the engine.

  Therefore, according to this configuration, it is possible to satisfactorily reduce turbulent frictional resistance and pressure loss in the cooling system while suppressing environmental loads.

  The cooling system (cooling medium circulation device / cooling medium operation system) may include an adjusting unit. The adjusting unit is configured to adjust an addition state of the additive with respect to the cooling medium. The adjustment unit is interposed in the circulation path. Specifically, the adjustment unit may be configured to increase or decrease the amount of the additive added to the cooling medium.

  In such a configuration, for example, the addition state of the additive in the cooling medium can be adjusted according to the operating state of the engine. Thereby, the cooling state of the engine can be set appropriately.

  That is, turbulent frictional resistance is reduced and heat transfer from the wall surface to the cooling medium is mitigated by reducing the generation of eddy currents in the vicinity of the wall surface due to the addition of the additive. Therefore, for example, at the time of cold start, warming up can be promoted by increasing the amount of the additive. In addition, during high load operation, good cooling can be performed by reducing the amount of the additive added.

  The adjusting unit may include a collecting member. This collection member is comprised so that the said additive in the said cooling medium can be collected. Specifically, for example, the collection member can be configured by a filter or the like. For example, the adjustment unit may be configured to adjust the addition state of the additive to the cooling medium by controlling the collection time of the additive by the collection member.

  In such a configuration, the additive in the cooling medium is trapped by the trapping member according to the operating state of the engine (for example, during high load operation or when high load operation continues for a predetermined time or more). Be collected. Thereby, the addition amount of the said additive is decreased. Therefore, the cooling state of the engine can be appropriately set according to the operating state.

  In this configuration, when the cooling medium is discharged from the circulation path, the additive in the cooling medium can be collected by the collecting member. That is, the collection member can easily separate the liquid cooling medium from the solid additive when the cooling medium is discarded.

  When the additive is collected by the collection member (for example, when the cooling medium is discharged from the circulation path), the cooling system (cooling medium circulation device / cooling medium operation system) The delivery amount of the cooling medium may be increased. Thereby, collection of the additive by the collection member can be performed quickly.

  The cooling system (cooling medium circulation device / cooling medium operation system) may be configured to be able to determine an abnormality of the adjustment unit based on the temperature of the cooling medium.

  For example, when the temperature of the cooling medium does not rise in a predetermined manner in spite of the addition operation of the additive (release operation into the cooling medium), an abnormality of the additive addition operation (of the additive Insufficiency due to degradation or the like, or abnormality of the adjusting unit) can be determined. Alternatively, when the temperature of the cooling medium exceeds a predetermined temperature when performing a process of reducing the amount of the additive added in order to perform good cooling of the engine in a high load operation or the like, the additive An abnormality in the collection operation (abnormality of the collection member, etc.) can be determined.

  The adjusting unit may be configured to release the additive into the cooling medium. Specifically, for example, the adjusting unit may be configured to release the additive collected by the collecting member from the collecting member into the cooling medium.

  In this case, the adjustment unit may be configured to adjust the addition state of the additive with respect to the cooling medium, for example, by controlling the release time of the additive.

  In such a configuration, the additive is released into the cooling medium according to the operating state of the engine (for example, when starting or when the engine is stopped). Thereby, the addition amount of the additive is increased. Therefore, the cooling state of the engine or the addition state of the additive in the cooling medium can be appropriately set according to the operating state.

  When the additive is released when the engine is stopped, for example, idling can be continued until the end of the release. Alternatively, the pump can be driven until the end of discharge even after the engine is stopped.

  The adjustment unit may include a crushing unit. The crushing part is configured to crush the aggregate of the additive. The crushing part is interposed in the circulation path on the downstream side in the flow direction of the cooling medium from the position where the additive is discharged into the cooling medium.

  Specifically, for example, the crushing part may be composed of a plate-like member having a large number of openings through which primary particles of the additive can pass. That is, this opening may be formed slightly larger than the size of the primary particle of the additive (for example, the maximum width in the direction along the plane perpendicular to the longitudinal direction of the particle). Or the said crushing part may be comprised from the projection part provided so that it might protrude in the said circulation path | route, for example.

  In such a configuration, the aggregate of the additive is crushed by the crushing unit. That is, for example, when the aggregate passes through the opening or when the aggregate collides with the protrusion, the aggregate of the additive is crushed. Thereby, the desired turbulent frictional resistance and heat transfer coefficient at the wall surface can be realized reliably and quickly.

  The adjusting unit may be configured to intermittently release the additive into the cooling medium. That is, the adjustment unit may be configured to release the additive into the cooling medium in a plurality of times. Thereby, the distribution of the additive in the cooling medium can be made uniform quickly. Therefore, a desired turbulent frictional resistance reduction state and cooling performance according to the operating state can be set quickly.

  The cooling system (cooling medium circulation device / cooling medium operation system) is configured such that when the additive is discharged into the cooling medium by the adjusting unit, the amount of the cooling medium delivered by the pump increases. It may be. Thereby, addition of the said additive can be performed rapidly.

  The cooling system (cooling medium circulation device / cooling medium operating system) is configured such that when the additive is released into the cooling medium by the adjusting unit, the amount of the cooling medium delivered by the pump is reduced. It may be.

  In such a configuration, for example, when it is desired to promote warm-up of the engine, when the additive is released into the cooling medium, the delivery amount of the pump is reduced. Thereby, before the said additive is disperse | distributed favorably in the said cooling medium and there exists an effect of the fall of the heat transfer rate in the said wall surface, it can suppress as much as possible that the said engine is cooled too much. .

  The adjustment unit may be configured to change a projected area of the filter with respect to a cross section orthogonal to the flow direction in the circulation path.

  Specifically, for example, the filter may be configured to be rotatable about an axis parallel to the cross section. In this case, the adjustment unit is configured to be able to change the rotation angle of the filter.

  According to this configuration, the addition state of the additive in the cooling medium can be adjusted by adjusting the rotation angle of the filter.

  Further, in this case, an accommodation portion including a space surrounded by the filter and the protruding wall may be provided in the adjustment portion. That is, the accommodating part is constituted by a concave part formed by the protruding wall and the filter. The accommodating portion is configured to accommodate and hold the additive even in a state where the rotation angle is large (for example, a state where the filter is substantially perpendicular to the cross section).

  Specifically, for example, the protruding wall may be formed in a cylindrical shape, and the accommodating portion may be formed so as to open along the normal direction of the filter.

  Or the said accommodating part may be comprised from the recessed part opened along the said filter. In this case, the accommodating portion is provided at an end portion of the filter.

  According to such a configuration, after the adjustment operation of the addition state of the additive is completed, the rotation angle of the filter is increased (for example, even if the filter is held in a state substantially perpendicular to the cross section), The additive collected by the filter may be held in the storage unit. Therefore, the flow resistance of the cooling medium by the filter itself can be reduced while effectively suppressing the unexpected release of the additive from the filter to the cooling medium.

  Alternatively, for example, the filter may be provided to be slidable along the cross section. In this case, the adjustment unit is configured to be able to change the position of the filter.

  According to this configuration, the addition state of the additive in the cooling medium can be adjusted by adjusting the position of the filter.

  In this case, the adjustment unit may be configured to retract the filter to a position that does not overlap the cross section.

  According to such a configuration, the flow resistance of the cooling medium by the filter itself can be effectively reduced after the operation of adjusting the addition state of the additive is completed.

  The adjustment unit may include a temperature-sensitive deformation unit. The temperature-sensitive deformation portion is configured to be deformed according to the temperature of the cooling medium. And this temperature-sensitive deformation | transformation part is comprised so that the state of the said filter can be changed by deform | transforming according to the temperature of the said cooling medium.

  According to this configuration, the state of the filter can be changed with a very simple device configuration without using an electric actuator or the like.

  The filter may be subjected to a surface treatment that facilitates the removal of the additive. This surface treatment can be performed, for example, by coating with a fluorine-based synthetic resin (polytetrafluoroethylene or the like).

  Accordingly, when the additive is released into the cooling medium, the additive can be easily detached from the filter. Thus, the additive can be released from the filter quickly.

  The additive may be subjected to a surface treatment that imparts releasability. This surface treatment can also be performed in the same manner as described above.

  Thereby, aggregation of the additive can be reduced. In addition, when the additive is released into the cooling medium, the additive can be easily detached from the filter. Thus, the additive can be released from the filter quickly.

  The circulation path may include an adjustment unit communication path and a bypass flow path that bypasses the adjustment unit communication path, and the adjustment unit may be interposed in the adjustment unit communication path. Here, the adjustment unit may include a distribution unit. This distribution part is comprised so that the ratio of the flow volume of the said adjustment part communicating path and the said bypass flow path can be changed. Specifically, the distribution unit can be constituted by a flow control valve or a switching valve.

  According to this configuration, the adjustment state of the additive is adjusted by the adjustment unit in the adjustment unit communication path. On the other hand, in the bypass flow path, the addition state of the additive is not adjusted by the adjustment unit. The degree of adjustment of the additive addition state by the adjustment unit may be controlled by the flow rate of the cooling medium in the adjustment unit communication path.

  For example, when the distribution unit is configured by a switching valve, the cooling medium passes through the bypass flow path when the adjustment state of the additive is not adjusted by the adjustment unit. That is, the cooling medium bypasses the adjustment unit communication path (the adjustment unit). Thereby, the flow resistance of the cooling medium at the time point can be suppressed.

  The cooling system (cooling medium circulation device / cooling medium operation system) may further include an output unit. The output unit is configured to output a signal corresponding to the amount of the additive in the cooling medium. And the said adjustment part is comprised so that the addition state of the said additive with respect to the said cooling medium can be adjusted according to the output of the said output part.

  Specifically, for example, the output unit may be configured by an optical sensor interposed in the circulation path. Alternatively, for example, the output unit may be configured to estimate the addition state of the additive based on the temperature of the cooling medium (temperature itself or temperature change rate) and generate an output corresponding to the estimated value.

  In such a configuration, the addition state of the additive to the cooling medium is adjusted according to the output of the output unit according to the amount of the additive in the cooling medium. For example, whether the additive amount is excessive or insufficient can be determined according to a signal from the output unit.

  In the case where a plurality of the adjusting units are provided, the operation of each adjusting unit can be controlled according to the operating state of the engine.

  For example, a second adjustment unit may be provided downstream of the first adjustment unit in the flow direction. Alternatively, the second adjustment unit may be provided in parallel with the first adjustment unit. The operations of the first adjustment unit and the second adjustment unit can be controlled according to the operating state of the engine.

  According to such a configuration, the adjustment of the additive state of the additive can be performed more appropriately.

  Hereinafter, embodiments of the present invention (embodiments that the applicant considers best at the time of filing of the present application) will be described with reference to the drawings.

  <Schematic Configuration of Cooling System> FIG. 1 is a schematic configuration diagram of an engine cooling system 1 (hereinafter referred to as “cooling system 1”) according to an embodiment of the present invention. Referring to FIG. 1, the cooling system 1 includes a liquid-cooled engine 10, a coolant circulation device 20 that constitutes the cooling medium circulation device of the present invention, and an electronic control unit ECU that controls these operations. Yes. The electronic control unit ECU and the coolant circulation device 20 constitute the cooling medium operation system of the present invention.

  The engine 10 is connected to a coolant circulation device 20. That is, the coolant circulation device 20 is configured to supply a liquid coolant to the engine 10 (a coolant C described later: refer to FIG. 2A) and collect the coolant from the engine 10. The engine 10 and the coolant circulation device 20 constitute a circulation path of the present invention.

  Specifically, a pump 21, a radiator 22, and an adjustment unit 23 are interposed in the coolant circulation device 20. That is, the engine 10, the pump 21, the radiator 22, and the adjustment unit 23 are connected by the circulation pipe 24. In addition, the arrow attached | subjected to the edge part of the circulation pipe 24 shows the flow direction of the said coolant.

  The radiator 22 is disposed upstream of the pump 21 in the flow direction and downstream of the engine 10 in the flow direction. The radiator 22 is configured to cool the coolant by heat exchange with outside air.

  That is, the cooling system 1 is configured to cool the engine 10 by circulating the liquid coolant in the circulation path by the operation of the pump 21.

  In the present embodiment, an additive made of a synthetic resin fiber (additive AD described later: see FIG. 2A) is added to the coolant. Specifically, this additive is obtained by coating the surface of a nylon fiber with polytetrafluoroethylene as a releasability imparting agent. When the diameter of the primary particle (one fiber) of this additive is d and the length is L, the additive has a size of about d = 5 to 100 μm, L = about 100 to 2000 μm, and an aspect ratio L A primary particle shape having a / d of 20 or more is used.

  The adjustment unit 23 is configured to adjust the addition state of the additive to the coolant. That is, the adjustment unit 23 is configured to increase and decrease the substantial amount of the additive added to the coolant (the amount dispersed in the coolant).

  Moreover, in this embodiment, the adjustment part 23 is arrange | positioned rather than the pump 21 in the downstream in the said flow direction.

  The circulation pipe 24 is a substantially circular tubular member, and is provided so as to connect each part of the cooling system 1.

  The electronic control unit ECU includes a CPU, a ROM, a RAM, an interface, and the like. The ROM stores in advance a routine (program) executed by the CPU, a table (lookup table, map), parameters, and the like that are referred to when the routine is executed. The RAM is configured to be able to temporarily store data as needed during routine execution by the CPU. The electronic control unit ECU is electrically connected to each part (actuator, sensor, etc.) of the engine 10 and the coolant circulation device 20 via an interface.

  <Specific Example of Configuration of Adjustment Unit> FIGS. 2A and 2B are enlarged cross-sectional views showing the configuration of the first example of the adjustment unit 23 shown in FIG. Referring to FIGS. 1, 2 </ b> A, and 2 </ b> B, the adjustment unit 23 includes a collection filter 231, a shaft 232, and a filter angle adjustment unit 233.

  The collection filter 231 as the collection member of the present invention is configured to collect (recover) the additive AD in the coolant C. Specifically, the collection filter 231 is composed of a substantially flat filter having an opening diameter slightly larger than the diameter d of the primary particles of the additive AD.

  In the present embodiment, the collection filter 231 is subjected to a surface treatment so that the additive AD is easily detached. Specifically, in the present embodiment, each fiber constituting the collection filter 231 is coated with polytetrafluoroethylene as a releasability imparting agent.

  Further, in this embodiment, the shape of the flow path in the circulation pipe 24 at the center position of the collection filter 231 (the cross section perpendicular to the flow direction in the flow path of the coolant C inside the circulation pipe 24) and the trapping. The collection filter 231 is formed so that the shape of the collection filter 231 in a plan view substantially matches. That is, as shown in FIG. 2A, when the collection filter 231 is arranged so as to be perpendicular to the flow direction (the direction indicated by the arrow in the figure), it passes through the flow path cross section. The collection filter 231 is configured so that almost the entire coolant C passes through the collection filter 231.

  Specifically, in the present embodiment, the collection filter 231 is formed in a substantially circular shape in plan view. The diameter of the collection filter 231 is set substantially equal to the inner diameter of the circulation pipe 24. That is, the collection filter 231 is formed so as to fit with the inner diameter of the circulation pipe 24 by a predetermined fitting intersection.

  Furthermore, in the present embodiment, the collection filter 231 is supported by the shaft 232. The shaft 232 is provided in parallel with the flow path cross section. One end of the shaft 232 is rotatably supported by the circulation pipe 24. The other end of the shaft 232 is connected to the filter angle adjusting unit 233. The filter angle adjustment unit 233 is composed of a stepping motor and is configured to rotate the shaft 232.

  Thus, in the adjustment unit 23 of the present embodiment, the collection filter 231 is configured to be rotatable about the shaft 232. Further, the adjusting unit 23 of the present embodiment changes the flow path by changing the angle formed by the flow path cross section and the collection filter 231 (hereinafter simply referred to as “the rotation angle of the collection filter 231”). It is comprised so that the projection area of the collection filter 231 with respect to a cross section can be changed.

  2A and 2B, the adjustment unit 23 appropriately changes the rotation angle of the collection filter 231 in accordance with the operating state of the engine 10 to add the additive AD to the collection filter 231. The addition state of the additive AD in the coolant C can be adjusted by collecting or discharging the collected additive AD to the coolant C. That is, the adjustment unit 23 of the present embodiment is configured such that the collection and release of the additive AD are performed by the collection filter 231.

  Referring to FIG. 1 again, an optical sensor 234 is interposed in the circulation pipe 24. The optical sensor 234 is configured to output a signal corresponding to the amount of the additive AD (see FIGS. 2A and 2B) in the coolant C.

  <Operation and Effect by Configuration of Example> Next, an adjustment (control) operation of the addition state of the additive AD in the coolant C according to the present example will be described with reference to a flowchart.

  FIG. 3 is a flowchart for explaining the operation of this embodiment. In the following description of each step of the flowchart (hereinafter, “step” is abbreviated as “S”), the reference numerals shown in FIG. 1, FIG. 2A, and FIG. (The same applies to the second and later embodiments described later).

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 300 shown in FIG. 3 every predetermined time.

  When the cooling system control routine 300 is executed, first, in S310, it is determined whether or not the current cooling water temperature Tw is lower than the warm-up water temperature Tw1. That is, it is determined whether the current operation state is during warm-up operation or after warm-up.

  If it is after the warm-up (S310 = No), next, in S320, whether or not the current operation state is the normal operation after the warm-up, that is, the current continuous high-load operation or immediately after It is determined whether or not.

  When the current operation state is a normal operation after warm-up (S320 = No), the operation state of the adjustment unit 23 is set to “addition mode” in S330. That is, as shown in FIG. 2A, the collection filter 231 is disposed substantially parallel to the flow direction. Thereby, the additive AD in the coolant C passes through the adjustment unit 23 without being collected by the collection filter 231. Further, the additive AD collected by the collection filter 231 is released from the collection filter 231 and released into the coolant C.

  In the “addition mode”, the additive AD made of synthetic resin fiber is dispersed in the water-based coolant C. When the longitudinal direction of the additive AD is directed to the flow direction, the generation of vortex near the wall surface of the circulation path is reduced. Thereby, the turbulent frictional resistance in the circulation path is reduced, and the load on the pump 21 is reduced. Therefore, the fuel consumption during low / medium load operation is improved, and the output during high rotation is improved.

  Here, the additive AD maintains a solid state relatively stably in the liquid coolant C. Therefore, the effects of reducing the turbulent frictional resistance as described above and reducing the load on the pump 21 can be stably obtained. Further, the necessity for replenishment due to deterioration of the additive AD can be alleviated.

  On the other hand, the heat transfer coefficient from the wall surface to the coolant C decreases due to the reduction in the generation of vortex near the wall surface due to the addition of the additive AD into the coolant C. That is, while the turbulent frictional resistance is reduced, the cooling efficiency of the engine 10 by the coolant C is slightly lowered.

  Therefore, when it is during the continuous high load operation or immediately after that (S320 = Yes), the operation state of the adjustment unit 23 is set to the “collection mode” in S340. That is, as shown in FIG. 2A, the collection filter 231 is disposed substantially perpendicular to the flow direction. Thereby, the additive AD in the coolant C is collected by the collection filter 231. Therefore, the good heat transfer state on the wall surface is restored, and good cooling of the engine 10 during high load operation is realized.

  In such a “recovery mode”, when the collection of the additive AD by the collection filter 231 is completed, the rotation angle of the collection filter 231 ensures a sufficient flow rate of the coolant C for cooling the engine 10, and It is set to a predetermined angle (for example, an angle formed by the collection filter 231 and the flow path cross section is about 45 °) so that the amount of dispersion of the additive AD in the coolant C does not increase.

  When the current operation state is the warm-up operation (S310 = Yes), the operation state of the adjustment unit 23 is set to “addition mode” in S330. Thereby, warming-up is promoted by increasing the dispersion amount (substantial addition amount) of the additive AD in the coolant C.

  In this way, after the operation state of the adjustment unit 23 is set to “addition mode” or “collection mode” according to the operation state, the process proceeds to S390, and this routine is once ended.

  As described above, according to the configuration of the present embodiment, it is possible to satisfactorily reduce the turbulent frictional resistance and the pressure loss in the cooling system 1 while suppressing the environmental load.

  Further, in the present embodiment, the adjustment unit 23 (collection filter 231) is disposed downstream of the pump 21 in the flow direction. Therefore, when the aggregate of the additive AD released from the adjusting unit 23 (collection filter 231) is subjected to a shearing force or an impact in the pump 21, the aggregate can be crushed well.

  Thus, according to the configuration of the present embodiment, the additive AD can be well dispersed in the coolant C. Therefore, the desired turbulent frictional resistance and heat transfer coefficient at the wall surface can be realized reliably and quickly.

  FIG. 4 is a flowchart for explaining the operation of the second embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that of the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 400 shown in FIG. 4 every predetermined time.

  When the cooling system control routine 400 is executed, first, in S410, it is determined whether or not the current cooling water temperature Tw is lower than the warm-up water temperature Tw1.

  If the current cooling water temperature Tw is equal to or higher than the warming-up water temperature Tw1 (S410 = No), it is next determined in S420 whether or not the continuous high load operation is being performed.

  When the current operation state is a normal operation after warm-up (S420 = No), the operation state of the adjustment unit 23 is set to “addition mode” in S430.

  On the other hand, when the continuous high load operation is being performed (S420 = Yes), it is determined in S425 whether or not the continuous high load operation state has passed for a predetermined time. When the continuous high-load operation state has elapsed for a predetermined time (S425 = Yes), the operation state of the adjustment unit 23 is set to “collection mode” in S440. When the continuous high-load operation state continues only for a short time (S425 = No), the operation state of the adjustment unit 23 is set to “addition mode” in S430.

  That is, in the present embodiment, when the continuous high-load operation state continues only for a short time, the additive AD is not collected by placing emphasis on the reduction of turbulent frictional resistance and pressure loss. .

  In this way, after the operation state of the adjusting unit 23 is set to “addition mode” or “collection mode” according to the operation state, the process proceeds to S490, and this routine is once ended.

  FIG. 5 is a flowchart for explaining the operation of the third embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 500 shown in FIG. 5 every predetermined time.

  When the cooling system control routine 500 is executed, first, in S510, it is determined whether or not the current cooling water temperature Tw is lower than the warm-up water temperature Tw1. If the current cooling water temperature Tw is equal to or higher than the warming-up water temperature Tw1 (S510 = No), it is next determined in S515 whether or not the low-rotation / medium / high-load operation is being performed.

  When the current operation state is not the low rotation / medium / high load operation (S515 = No), it is next determined in S520 whether the continuous high load operation is being performed. When the continuous high load operation is being performed (S520 = Yes), it is determined in S525 whether or not the continuous high load operation state has passed for a predetermined time.

  When the current operation state is a normal operation after warm-up (S520 = No), or when the continuous high-load operation state continues only for a short time (S525 = No), in S530, the adjustment unit 23 The operation state is set to “addition mode”. On the other hand, when the predetermined time has elapsed in the continuous high-load operation state (S525 = Yes), the operation state of the adjustment unit 23 is set to “collection mode” in S540.

  When the current operation state is a low rotation / medium / high load operation (S515 = No), the operation state of the adjustment unit 23 is set to the “addition mode” in S530.

  That is, in this embodiment, as in the second embodiment described above, when the continuous high-load operation state continues only for a short time, the addition of the turbulent friction resistance and pressure loss is emphasized. The collection of the product AD is not performed.

  Further, in this embodiment, the turbulent frictional resistance and pressure loss are reduced by the addition of the additive AD at the time of the low rotation / medium / high load operation in which the delivery amount of the pump 21 is small and the temperature of the engine 10 is likely to be high. As a result, the flow rate of the coolant C is improved. Thereby, the temperature of each part of the engine 10 is homogenized. In particular, the occurrence of knocking can be suppressed as much as possible by lowering the cylinder head wall temperature, which is likely to increase in temperature.

  Thus, after the operation state of the adjusting unit 23 is set to “addition mode” or “collection mode” according to the operation state, the process proceeds to S590, and this routine is once ended.

  FIG. 6 is a flow chart for explaining the operation of the fourth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 600 shown in FIG. 6 every predetermined time.

  When the cooling system control routine 600 is executed, first, in S605, the target value Ra of the dispersion amount (substantial addition amount) of the additive AD in the coolant C is acquired. That is, in S605, the current target value Ra is acquired based on the relationship F between the cooling water temperature Tw and the load D and the target value Ra and the current average load D and the current cooling water temperature Tw. This relationship F is a function or map stored in the ROM.

  Next, in S608, the current amount of dispersion R is acquired, and it is determined whether or not this amount exceeds the current target value Ra. Here, in this embodiment, the current dispersion amount R is acquired based on the output of the optical sensor 234 interposed in the circulation pipe 24.

  When the current dispersion amount R does not exceed the current target value Ra (S608 = No), the “addition mode” is performed. In this “addition mode”, first, the time (release time Tr) for holding the collection filter 231 in the release state shown in FIG. 2B is acquired (S632). The release time Tr is acquired based on the difference between the current dispersion amount R and the target value Ra, the engine speed Ne, and the relationship (function or table) Ht.

  Here, the release time Tr is set to a time shorter than the total amount release time Tr0. This total amount release time Tr0 is the initial state when assuming the initial state in which the total amount of the additive AD in the cooling system 1 is collected in the collection filter 231 in the recovery state shown in FIG. 2A. 2B to the discharge state shown in FIG. 2B until the total amount of the additive AD is discharged into the coolant C from the time when the state of the collection filter 231 changes to the discharge state shown in FIG.

  Subsequently, in S638, the additive AD is released during the release time Tr. That is, the collection filter 231 is held in the discharge state shown in FIG. 2B during the discharge time Tr.

  On the other hand, when the current dispersion amount R exceeds the current target value Ra (S608 = Yes), the “collection mode” is performed. In this “recovery mode”, first, the time (recovery time Ts) for holding the collection filter 231 in the recovery state shown in FIG. 2A is acquired (S642). The collection time Ts is acquired based on the difference between the current dispersion amount R and the target value Ra, the engine speed Ne, and the relationship (function or table) Gt.

  Here, the recovery time Ts is set to a time shorter than the total amount recovery time Ts0. This total amount recovery time Ts0 assumes that the initial state in which the total amount of the additive AD in the cooling system 1 is not collected by the collection filter 231 but is discharged into the coolant C is shown in FIG. The time from when the state of the collection filter 231 changes to the collection state shown in FIG. 2 to when the entire amount of the additive AD is collected by the collection filter 231.

  Subsequently, in S648, the additive AD is collected for the collection time Ts. That is, the collection filter 231 is held in the collection state shown in FIG. 2A during the collection time Ts.

  In this way, after the “addition mode” or the “recovery mode” is performed for a predetermined time according to the operating state, the process proceeds to S690, and this routine is once ended.

  According to the present embodiment, the dispersion amount of the additive AD can be arbitrarily set according to the operating state. Thereby, according to the driving | running state, a cooling state and a turbulent frictional resistance reduction state can be set arbitrarily.

  FIG. 7 is a flowchart for explaining the operation of the fifth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 700 shown in FIG. 7 every predetermined time.

  When the cooling system control routine 700 is executed, first, in S705, the target value Ra of the dispersion amount of the additive AD in the coolant C is changed to the average load D and the cooling in the same manner as in S605 (see FIG. 6). It is acquired based on the water temperature Tw (the same applies to S805 in FIG. 8 described later).

  Next, in S708, the current amount of dispersion R is acquired, and it is determined whether or not it exceeds the current target value Ra. Here, in the present embodiment, the current amount of dispersion R is acquired based on the output of the optical sensor 234. When the current dispersion amount R does not exceed the current target value Ra (S708 = No), the “addition mode” is performed.

  In the “addition mode” of the present embodiment, the additive AD is intermittently released into the coolant C. That is, in the “addition mode” of the present embodiment, the additive AD is released into the coolant C in a plurality of times. Such “addition mode” is performed as follows.

  First, in S732, the release time Tr is acquired based on the difference between the current dispersion amount R and the target value Ra and the engine speed Ne.

  Next, in S734, the coolant circulation time Tc is acquired based on the engine speed Ne and the coolant temperature Tw. The coolant circulation time Tc is a time required for the coolant C to go around the cooling system 1 once.

  Subsequently, in S735, the division number N of the release of the additive AD is obtained. The number of divisions N is acquired based on, for example, a map obtained in advance by experiment or simulation, and the current coolant circulation time Tc and discharge time Tr.

  Thereafter, in S736, the divided discharge time Trd and the interval Tr_int are acquired based on the number of divisions N, the current coolant circulation time Tc, and the discharge time Tr.

  Finally, in S738, the additive AD with the divided release time Trd is released N times every interval Tr_int.

  On the other hand, when the current dispersion amount R exceeds the current target value Ra (S708 = Yes), the “collection mode” is performed (S740).

  In this way, after the “addition mode” or “recovery mode” is performed according to the operation state, the process proceeds to S790, and this routine is once ended.

  According to the present embodiment, since the additive AD is released into the coolant C in a plurality of times, the distribution of the additive AD in the coolant C can be made uniform quickly. Therefore, a desired turbulent frictional resistance reduction state and cooling performance according to the operating state can be set quickly.

  FIG. 8 is a flow chart for explaining the operation of the sixth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 800 shown in FIG. 8 every predetermined time.

  When the cooling system control routine 800 is executed, first, in S805, the target value Ra of the dispersion amount of the additive AD in the coolant C is acquired based on the average load D and the cooling water temperature Tw.

  Next, in S808, the current amount of dispersion R is acquired, and it is determined whether or not this amount exceeds the current target value Ra. Here, in the present embodiment, the current amount of dispersion R is acquired based on the output of the optical sensor 234.

  When the current dispersion amount R does not exceed the current target value Ra (S808 = No), the “addition mode” is performed. On the other hand, when the current dispersion amount R exceeds the current target value Ra (S808 = Yes), the “collection mode” is performed.

  In the present embodiment, in the “addition mode”, the collection filter is configured such that the amount of the additive AD released from the collection filter 231 is larger than the amount of the additive AD collected by the collection filter 231. The rotation angle of 231 is set (for example, the angle formed by the collection filter 231 and the flow path cross section is 45 ° or more).

  In this embodiment, in the “recovery mode”, the amount of the additive AD collected by the collection filter 231 is larger than the amount of the additive AD released from the collection filter 231. The rotation angle of the collection filter 231 is set (for example, the angle formed by the collection filter 231 and the flow path cross section is 45 ° or less).

  In the “addition mode” of the present embodiment, first, the rotation angle of the collection filter 231 is based on the difference between the current dispersion amount R and the target value Ra, the engine speed Ne, and the relationship (function or table) Ha. Is acquired (S833). Subsequently, the collection filter 231 is held at the acquired angle (S838).

  Similarly, in the “recovery mode”, first, the rotation angle of the collection filter 231 is determined based on the difference between the current dispersion amount R and the target value Ra, the engine speed Ne, and the relationship (function or table) Ga. Obtained (S843). Subsequently, the collection filter 231 is held at the acquired angle (S848).

  In this way, after the “addition mode” or “recovery mode” is performed according to the operating state, the process proceeds to S890, and this routine is once ended.

  According to the present embodiment, the dispersion amount of the additive AD can be arbitrarily set according to the operating state by arbitrarily changing the rotation angle of the collection filter 231. Thereby, the setting of a cooling state and a turbulent frictional resistance reduction state according to an operation state can be performed with a simple apparatus configuration.

  FIG. 9 is a flowchart for explaining the operation of the seventh embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 900 shown in FIG. 9 every predetermined time.

  When the cooling system control routine 900 is executed, first, in S905, the target value Ra of the dispersion amount of the additive AD in the coolant C is acquired based on the average load D and the cooling water temperature Tw.

  Next, in S908, it is determined whether or not the current dispersion amount R exceeds the current target value Ra. When the current dispersion amount R does not exceed the current target value Ra (S908 = No), the “addition mode” as described in each of the above-described embodiments is started (S930). On the other hand, when the current dispersion amount R exceeds the current target value Ra (S908 = Yes), the “collection mode” as described in the above-described embodiments is started (S940).

  Subsequently, in S950, it is determined whether or not the difference (absolute value) between the current dispersion amount R and the target value Ra is larger than a predetermined value ΔR0.

  When the difference between the current dispersion amount R and the target value Ra is small (S950 = No), the pump 21 operates normally (S962). On the other hand, when the difference between the current dispersion amount R and the target value Ra is large (S950 = Yes), the pump 21 is driven so that the delivery amount of the pump 21 increases (S964).

  The change in the output of the pump 21 can be easily realized by using an electric pump as the pump 21, for example. However, even if a mechanical pump is used as the pump 21, the output of the pump 21 can be easily changed by interposing a transmission mechanism or the like between the output shaft of the engine 10 and the pump 21. (The same applies to the following embodiments).

  Thereafter, the process proceeds to S990, and this routine is once ended.

  According to the present embodiment, when the addition mode or the recovery mode is performed by the collection filter 231, the amount of coolant C delivered by the pump 21 increases. Thereby, discharge | release and collection of additive AD can be performed rapidly.

  FIG. 10 is a flowchart for explaining the operation of the eighth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 1000 shown in FIG. 10 every predetermined time.

  When the cooling system control routine 1000 is executed, first, in S1010, it is determined whether the current operation state is during the warm-up operation or after the warm-up as in S310 (see FIG. 3).

  If it is after warm-up (S1010 = No), next, in S1020, it is determined whether or not it is currently in continuous high-load operation or just after that, as in S320 (see FIG. 3). .

  When the current operation state is a normal operation after warm-up (S1020 = No), the “addition mode” is performed (S1030).

  When it is during or immediately after the continuous high load operation (S1020 = Yes), the “recovery mode” is performed (S1040). At this time, it is determined whether or not the collection of the additive AD is completed (S1050), and the drive of the pump 21 is controlled according to the determination result. The determination in S1050 can be made based on the output of the optical sensor 234, a timer, or the like.

  Specifically, after the collection of the additive AD is completed, the pump 21 is normally driven (S1050 = Yes... S1062). On the other hand, until the collection of the additive AD is completed, the pump 21 is driven so that the delivery amount of the pump 21 is increased (S1050 = No... S1064).

  Thereafter, the process proceeds to S1090, and this routine is once ended.

  As described above, in this embodiment, when the high load operation is continued and the improvement of the cooling efficiency of the engine 10 is required, the delivery amount of the pump 21 is increased. Thereby, the “recovery mode” is completed quickly, and the cooling performance of the engine 10 by the coolant C is recovered early. In addition, an increase in the flow rate of the coolant C in the middle of recovery of the additive AD makes it possible to compensate for a decrease in cooling performance due to the residual additive AD.

  FIG. 11 is a flowchart for explaining the operation of the ninth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 1100 shown in FIG. 11 every predetermined time.

  When the cooling system control routine 1100 is executed, first, in S1110, it is determined whether the current operation state is during the warm-up operation or after the warm-up, similarly to S1010 (see FIG. 10).

  If it is after warm-up (S1110 = No), next, in S1120, it is determined whether or not it is currently in continuous high-load operation or just after that, as in S1020 (see FIG. 10). .

  When the current operation state is normal operation after warm-up (S1120 = No), the “addition mode” is performed (S1130). On the other hand, when it is during or immediately after the continuous high load operation (S1120 = Yes), the “collection mode” is performed (S1140).

  Here, in this example, it is determined whether or not the addition of the additive AD in the “addition mode” is completed (S1152). Further, it is determined whether or not the collection of the additive AD in the “collection mode” has been completed (S1154). And the drive of the pump 21 is controlled according to these determination results. In this embodiment, the determinations in S1152 and S1154 are also performed in the same manner as in the above-described S1050 (see FIG. 10).

  After the addition of the additive AD in the “addition mode” is completed, the pump 21 is normally driven (S1152 = Yes... S1161). Further, after the collection of the additive AD in the “collection mode” is completed, the pump 21 is normally driven (S1154 = Yes... S1162).

  On the other hand, before the addition of the additive AD in the “addition mode” is finished, the pump 21 is driven so that the delivery amount of the pump 21 is reduced (S1152 = No... S1163). Further, before the collection of the additive AD in the “collection mode” is completed, the pump 21 is driven so that the delivery amount of the pump 21 is increased (S1154 = No... S1164).

  Thereafter, the process proceeds to S1190, and this routine is once ended.

  As described above, in this embodiment, in addition to the operation of the ninth embodiment described above, the addition of the additive AD into the coolant C during the “addition mode”, that is, the “addition mode” and the sufficient amount Before the dispersion is completed, the flow rate of the coolant C is reduced. Thereby, in the middle of the “addition mode”, it is possible that the engine 10 is excessively cooled by flowing the coolant C at which the cooling efficiency is not sufficiently reduced due to the dispersion of the additive AD at a high flow rate. Can be suppressed. Therefore, fuel consumption and exhaust emissions

  FIG. 12 is a flowchart for explaining the operation of the tenth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 1200 shown in FIG. 12 every predetermined time.

  When cooling system control routine 1200 is executed, it is first determined in S1201 whether or not the ignition switch has been turned OFF. When the ignition switch is not turned off (S1201 = No), normal control similar to the above-described embodiments is performed (S1202).

  On the other hand, when the ignition switch is turned off (S1201 = Yes), it is next determined in S1270 whether or not the additive AD has been released. This determination can be made based on, for example, a flag set according to the additive AD release operation and recovery operation, the output of the optical sensor 234, and the like (the same applies to S1370 in FIG. 13 described later). ).

  When the additive AD has not been released (S1270 = No), the stop of the engine 10 is delayed (S1272), and the additive AD release process (the same process as the “addition mode” described above) is performed (S1274). . When the additive AD has been released (S1270 = Yes), the engine 10 is allowed to stop (S1276).

  Thereafter, the process proceeds to S1290, and this routine is once ended.

  Thus, in the present embodiment, when the amount of dispersion of the additive AD in the coolant C is small or almost absent before the engine 10 is stopped (the additive AD is collected by the collection filter 231). In such a case, the stop of the engine 10 is delayed and the operation of the pump 21 is maintained. During this delay time, the additive AD is released and dispersed in the coolant C.

  According to the present embodiment, since the additive AD is already added to the coolant C at the next cold start, the cooling efficiency by the coolant C is lowered. Therefore, the warm-up performance at the next cold start is improved.

  FIG. 13 is a flow chart for explaining the operation of the eleventh embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 1300 shown in FIG. 13 every predetermined time.

  When the cooling system control routine 1300 is executed, it is first determined in S1301 whether or not the ignition switch has been turned off. When the ignition switch is not turned off (S1301 = No), normal control similar to the above-described embodiments is performed (S1302).

  On the other hand, when the ignition switch is turned off (S1301 = Yes), the engine 10 stops. At this time, it is determined in S1370 whether or not the additive AD has been released.

  When the additive AD has not been released (S1370 = No), the pump 21 is activated (S1372), and the additive AD is released (S1374). The operation of the pump 21 while the engine 10 is stopped can be easily realized by using, for example, an electric pump as the pump 21. However, even if the pump 21 is a mechanical pump, the pump 21 can be operated for a predetermined time even when the engine 10 is stopped by using a cell motor or the like.

  When the additive AD has been released (S1370 = Yes), the pump 21 stops (S1276).

  Thereafter, the process proceeds to S1390, and this routine is once ended.

  Thus, in the present embodiment, when the amount of dispersion of the additive AD in the coolant C is small or almost absent before the engine 10 is stopped (the additive AD is collected by the collection filter 231). When the engine 10 is stopped, the pump 21 is operated, and the additive AD is released and dispersed in the coolant C. Thereby, the warm-up performance at the time of the next cold start is improved as in the tenth embodiment described above.

  FIG. 14 is a flowchart for explaining the operation of the twelfth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 1400 shown in FIG. 14 every predetermined time.

  When the cooling system control routine 1400 is executed, first, in S1401, it is determined whether or not the current operation state is during the cold operation (after the cold start and before the end of warm-up). When the cold operation is not being performed (S1401 = No), normal control similar to the above-described embodiments is performed (S1402).

  On the other hand, if it is during the cold operation (S1401 = Yes), it is determined in S1470 whether or not the additive AD has been released.

  When the additive AD has not been released (S1470 = No), the pump 21 is activated (S1472), and the additive AD is released (S1474). On the other hand, when the additive AD has been released (S1470 = Yes), normal control similar to the above is performed (S1402).

  Thereafter, the process proceeds to S1490, and this routine is once ended.

  Thus, in this embodiment, warm-up performance is improved by dispersing the additive AD in the coolant C when the engine 10 is cold started.

  FIG. 15 is a flowchart for explaining the operation of the thirteenth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes a cooling system control routine 1500 shown in FIG. 15 every predetermined time.

  When the cooling system control routine 1500 is executed, it is first determined in S1501 whether or not the forced recovery mode is set. This forced recovery mode can be set / cancelled by a predetermined switch, for example. Alternatively, the forced recovery mode can be set according to a predetermined operation when the coolant C is discharged from the cooling system 1 for replacement of the coolant C or maintenance of the engine, for example.

  When not in the forced recovery mode (S1501 = No), normal control similar to the above-described embodiments is performed (S1502).

  On the other hand, if the forced recovery mode is selected (S1501 = Yes), it is then determined in S1570 whether or not the additive AD has been recovered.

  When the additive AD has not been collected (S1570 = No), the pump 21 is driven (S1572). Specifically, for example, engine stop is delayed and idling is maintained. Alternatively, for example, the pump 21 is forcibly driven while the engine is stopped. Then, the additive AD recovery process (the same process as in the “recovery mode” described above) is performed (S1274).

  When the additive AD has been collected (S1270 = Yes), the stop of the pump 21 (stop of the engine 10 or termination of the forced drive of the pump 21 while the engine is stopped) is permitted (S1276).

  Thereafter, the process proceeds to S1290, and this routine is once ended.

  Thus, in the present embodiment, when the coolant C is discharged from the cooling system 1 to replace the coolant C or maintain the engine, the additive AD in the coolant C is forcibly recovered. (Collected by the collection filter 231).

  The recovered additive AD can be reused by being discharged into the coolant C after the injection of fresh coolant C. Alternatively, when the collection filter 231 is replaced, the spent additive AD can be discarded together with the collection filter 231.

  According to the present embodiment, when the coolant C is discharged and discarded, the liquid coolant C and the solid additive AD can be easily separated. In addition, the additive AD can be reused when the coolant C is replaced. Therefore, the environmental load by discarding the water-based coolant C in a state where the solid additive AD is mixed can be suitably reduced.

  FIG. 16 is a flowchart for explaining the operation of the fourteenth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes a cooling system control routine 1600 shown in FIG. 16 every predetermined time.

  When the cooling system control routine 1600 is executed, first, in S1601, it is determined whether or not the forced recovery mode is in the same manner as in S1501 (see FIG. 15).

  When not in the forced recovery mode (S1601 = No), normal control similar to the above-described embodiments is performed (S1602).

  On the other hand, if it is the forced recovery mode (S1601 = Yes), it is then determined in S1670 whether the counter Cs is smaller than a predetermined value Cs0.

  If Cs <Cs0 (S1670 = Yes), the pump 21 is driven (S1672). Specifically, for example, engine stop is delayed and idling is maintained. Alternatively, for example, the pump 21 is forcibly driven while the engine is stopped. Then, the additive AD recovery process (the same process as in the “recovery mode” described above) is performed (S1674).

  When the counter Cs reaches the predetermined value Cs0 (S1670 = No), stop of the pump 21 (stop of the engine 10 or end of forced drive of the pump 21 while the engine is stopped) is permitted (S1676).

  Thereafter, the process proceeds to S1690, and this routine is once ended.

  As described above, in the present embodiment, when the coolant C is discharged from the cooling system 1 to the outside for the replacement of the coolant C, engine maintenance, or the like, it is sufficient for the forcible recovery of the additive AD. The pump 21 is driven for a time. Thereby, the additive AD in the coolant C is forcibly collected (collected by the collection filter 231).

  According to this embodiment, as in the above-described thirteenth embodiment, the environmental load when the coolant C is discharged and discarded can be suitably reduced.

  FIG. 17 is a flowchart for explaining the operation of the fifteenth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes a cooling system control routine 1700 shown in FIG. 17 every predetermined time.

  When cooling system control routine 1700 is executed, it is first determined in S1780 whether or not the entire amount of additive AD has been released into coolant C. This determination can be made, for example, by referring to the state of the collection filter 231 (rotation angle or the like) and the operation history.

  If the total amount of the additive AD has been released into the coolant C (S1780 = Yes), it is next determined whether or not the current dispersion amount R is smaller than the reference value R0. In the present embodiment, the current dispersion amount R is acquired based on the output of the optical sensor 234.

  If the current dispersion amount R is smaller than the reference value R0 (S1782 = Yes), the warning lamp is turned on (S1786), and an error code indicating that the additive AD is insufficient is recorded in the electronic control unit ECU (S1787).

  On the other hand, when the total amount of the additive AD is not released into the coolant C (S1780 = No), or when the current dispersion amount R is not smaller than the reference value R0 (S1782 == No), each of the above-described implementations Normal control similar to the example is performed (S1788).

  Thereafter, the process proceeds to S1790, and this routine is once ended.

  As described above, in this embodiment, when the substantial addition amount of the additive AD in the coolant C is insufficient due to deterioration of the additive AD or the like, the shortage is detected based on the output of the optical sensor 234. The The warning lamp and the error message prompt the user (driver) to add the additive AD or add / replace the coolant C containing the additive AD.

  FIG. 18 is a flowchart for explaining the operation of the sixteenth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes a cooling system control routine 1800 shown in FIG. 18 every predetermined time.

  When the cooling system control routine 1800 is executed, first, in S1880, it is determined whether or not the entire amount of the additive AD has been released into the coolant C as in S1780 (see FIG. 17).

  If the total amount of additive AD has been released into the coolant C (S1880 = Yes), then in S1881, the current operating state has elapsed for a predetermined time after the cold start and the light load state has continued. It is determined whether it is in a state.

  When the current operating state is a state in which a predetermined time has elapsed after the cold start and the light load state is maintained (S1881 = Yes), in S1883, the current cooling water temperature Tw and the predetermined comparison water temperature Tw_ref The difference ΔTw is acquired. As the predetermined comparison water temperature Tw_ref, for example, the cooling water temperature Tw_start at the start or the cooling water temperature acquired a predetermined time before the current process can be used. Thereafter, in S1885, it is determined whether ΔTw is smaller than a predetermined value ΔTw0.

  If ΔTw <ΔTw0 (S1885 = Yes), the warning lamp is turned on (S1886), and an error code indicating that the additive AD is insufficient is recorded in the electronic control unit ECU (S1877).

  On the other hand, when the total amount of the additive AD is not released into the coolant C (S1880 = No), the current operation state is not a state where a predetermined time has elapsed after the cold start and the light load state is not maintained ( When S1881 = No) or ΔTw ≧ ΔTw0 (S1885 = No), normal control similar to the above-described embodiments is performed (S1888).

  Thereafter, the process proceeds to S1890, and this routine is once ended.

  As described above, in the present embodiment, when the additive AD is dispersed in the coolant C, the cooling efficiency is lowered, and the rising speed (ΔTw) of the cooling water temperature Tw is below a predetermined value. In addition, it is determined that the substantial amount of additive AD has fallen below the lower limit. That is, in the present embodiment, the optical sensor 234 can be omitted.

  According to the present embodiment, a shortage of the substantial amount of the additive AD in the coolant C can be detected with a simple apparatus configuration.

  FIG. 19 is a flowchart for explaining the operation of the seventeenth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment has the same device configuration as that in the first embodiment described above.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 1900 shown in FIG. 19 every predetermined time.

  When the cooling system control routine 1900 is executed, it is first determined in S1980 whether or not the entire amount of the additive AD has been recovered.

  If the total amount of additive AD has been recovered (S1980 = Yes), it is then determined in S1985 whether the current cooling water temperature Tw is higher than a predetermined value Tw0.

  When Tw> Tw0 (S1985 = Yes), the warning lamp is turned on (S1986), and the error code is recorded in the electronic control unit ECU (S1987).

  On the other hand, when the total amount of the additive AD is not recovered (S1980 = No), or when Tw ≦ Tw0 (S1985 = No), normal control similar to the above-described embodiments is performed (S1988). .

  Thereafter, the process proceeds to S1990, and this routine is once ended.

  As described above, in this embodiment, when the cooling water temperature Tw becomes higher than the predetermined value Tw0 in an operation state in which the collection of the additive AD is required, such as in a high load operation, the abnormality ( Failure) is determined. Then, the warning lamp and the error message may prompt the user (driver) to replace the collection filter 231 or repair the adjustment unit 23.

  FIG. 20 is a flowchart for explaining the operation of the eighteenth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in the present embodiment is provided with a plurality of adjustment units 23 in the apparatus configuration of the first embodiment described above.

  The plurality of adjusting units 23 may be provided in “in series”, for example. That is, the first adjusting unit 23 can be provided on the upstream side in the flow direction with respect to the second adjusting unit 23.

  The plurality of adjusting units 23 may be provided in “parallel”. That is, the second adjustment unit 23 may be provided so that all or part of the coolant C that has passed through the first adjustment unit 23 does not pass through the second adjustment unit 23.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 2000 shown in FIG. 20 every predetermined time.

  When the cooling system control routine 2000 is executed, first, in S2005, the target value Ra of the dispersion amount of the additive AD in the coolant C is acquired based on the average load D and the cooling water temperature Tw. Next, in S2008, the current dispersion amount R is acquired, and it is determined whether or not this amount exceeds the current target value Ra.

  When the current dispersion amount R does not exceed the current target value Ra (S2008 = No), the “addition mode” is performed. On the other hand, when the current dispersion amount R exceeds the current target value Ra (S2008 = Yes), the “collection mode” is performed.

  In the present embodiment, in the “addition mode”, the number Nr of the adjusting units 23 (collecting filters 231) related to the operation of releasing the additive AD into the coolant C is determined by the current dispersion amount R and the target value Ra. It is set based on the difference, the engine speed Ne, and the relationship (function or table) Ha (S2031). And the discharge | release operation | movement of the additive AD in the coolant C is performed by the Nr adjustment parts 23 (collection filter 231) (S2038). Such a discharge operation can be performed in the same manner as in the above-described embodiments.

  Similarly, in the “recovery mode”, the number Ns of the adjusting units 23 (collection filters 231) related to the recovery operation of the additive AD from the coolant C is the difference between the current dispersion amount R and the target value Ra, the engine The rotation speed Ne is set based on the relationship (function or table) Ha (S2041). Then, the recovery operation of the additive AD is performed by the Ns adjustment units 23 (collection filter 231) (S2048). Such a collecting operation can also be performed in the same manner as in the above-described embodiments.

  In this way, after the “addition mode” or “recovery mode” is performed according to the operation state, the process proceeds to S2090, and this routine is once ended.

  According to the present embodiment, the dispersion amount of the additive AD can be arbitrarily set by controlling the operation state of the plurality of adjusting units 23 (collection filter 231) according to the operation state.

  FIG. 21 is an enlarged cross-sectional view showing the configuration of the nineteenth embodiment of the adjusting unit 23 shown in FIG. The adjusting unit 23 in the present embodiment includes a crushing filter 235 as a crushing unit of the present invention in addition to the apparatus configuration of the first embodiment described above. The crushing filter 235 is configured to crush the aggregate of the additive AD.

  Specifically, the crushing filter 235 is composed of a plate-like member having a large number of openings 235a through which primary particles of the additive AD can pass.

  In the present embodiment, the crushing filter 235 is interposed in the circulation pipe 24 on the downstream side in the flow direction from the collection filter 231. That is, the crushing filter 235 is disposed on the downstream side in the flow direction from the position where the additive AD is discharged into the coolant C by the collection filter 231.

  In such a configuration, when the aggregate of the additive AD passes through the opening 235a in the crushing filter 235, the aggregate is crushed. Thereby, the desired turbulent frictional resistance and heat transfer rate can be realized more reliably and quickly.

  FIG. 22 is an enlarged cross-sectional view showing the configuration of the twentieth embodiment of the adjusting unit 23 shown in FIG. The adjustment unit 23 in this embodiment includes a protrusion 236 as a crushing portion of the present invention in addition to the apparatus configuration of the first embodiment described above.

  The protrusion 236 is provided so as to protrude into the space inside the circulation pipe 24 on the downstream side in the flow direction from the collection filter 231.

  In such a configuration, the aggregate is crushed by the collision of the aggregate of the additive AD with the protrusion 236 and the vortex generated downstream of the protrusion 236 in the flow direction. Thereby, the desired turbulent frictional resistance and heat transfer rate can be realized more reliably and quickly.

  The protrusion 236 may be used in place of the crushing filter 235 (see FIG. 21) in the nineteenth embodiment described above, or may be used in combination with the crushing filter 235.

  FIG. 23 is an enlarged cross-sectional view showing the configuration of the twenty-first embodiment of the adjusting unit 23 shown in FIG. In the adjustment unit 23 of the present embodiment, a protruding wall 237 is provided at the end of the collection filter 231 so as to protrude from the collection filter 231. In the present embodiment, the protruding wall 237 is formed in a substantially cylindrical shape in plan view.

  And the accommodating part 237a is comprised by the space enclosed by the collection filter 231 and the protrusion wall 237. FIG. In the present embodiment, the accommodating portion 237a is constituted by a concave portion formed by the protruding wall 237 and the collection filter 231. And this accommodating part 237a is formed so that it may open along the normal line direction of the collection filter 231. FIG.

  According to such a configuration, even if the rotation angle of the collection filter 231 is increased as shown in FIG. 23 after the adjustment operation of the addition state of the additive AD is completed, the collection is performed by the collection filter 231. The additive AD can be favorably held in the accommodating portion 237a.

  Therefore, unexpected release of the additive AD from the collection filter 231 to the coolant C is effectively suppressed. Accordingly, the flow resistance of the coolant C by the collection filter 231 itself can be reduced while appropriately setting the desired turbulent frictional resistance and heat transfer coefficient.

  FIG. 24 is an enlarged cross-sectional view showing the configuration of the twenty-second embodiment of the adjusting unit 23 shown in FIG. FIG. 25 is a plan view of the collection filter 231 shown in FIG.

  Referring to FIGS. 24 and 25, the protruding wall 237 is provided only at one end of the collection filter 231 in the adjustment unit 23 of the present embodiment.

  Specifically, in the present embodiment, the lower end portion of the protruding wall 237 is provided so as to protrude from the collection filter 231. The upper end portion of the protruding wall 237 is bent along the collection filter 231. And the accommodating part 237a is comprised by the space enclosed by the collection filter 231 and the protrusion wall 237. FIG.

  Thus, in the present embodiment, the accommodating portion 237a is configured by a concave portion that opens along the collection filter 231. The accommodating portion 237 a is provided only at the one end portion of the collection filter 231.

  In the present embodiment, the protruding wall 237 is formed with a large number of holes that make it difficult for the additive AD to pass therethrough while allowing the coolant C to pass therethrough relatively easily.

  FIG. 26 is a flowchart for explaining an operation example of the adjustment unit 23 having the configuration of the twenty-second embodiment shown in FIGS. 24 and 25.

  The CPU in the electronic control unit ECU repeatedly executes a cooling system control routine 2600 shown in FIG. 26 every predetermined time.

  When the cooling system control routine 2600 is executed, first, in S2605, the target value Ra of the dispersion amount of the additive AD in the coolant C is acquired based on the average load D and the cooling water temperature Tw.

  Next, in S2606, the current amount of dispersion R is acquired, and it is determined whether this is an appropriate amount. Specifically, it is determined whether or not the deviation between the current dispersion amount R and the current target value Ra is within the range of the predetermined width ΔRa (whether or not the inequality Ra−ΔRa ≦ R ≦ Ra + ΔRa holds). Is done.

  If the current amount of dispersion R is not an appropriate amount (S2606 = No), it is then determined in S2608 whether the current amount of dispersion R exceeds the current target value Ra. When the current dispersion amount R does not exceed the current target value Ra (S2608 = No), the “addition mode” is performed (S2630). When the current dispersion amount R exceeds the current target value Ra (S2608 = Yes), the “collection mode” is performed (S2640).

  On the other hand, when the current dispersion amount R is an appropriate amount (S2606 = Yes), as shown in FIG. 24, the rotation angle of the collection filter 231 is held at a predetermined resistance reduction angle (S2609). In a state where the collection filter 231 is held at this resistance reduction angle, the rotation angle of the collection filter 231 is increased to nearly 90 degrees while the accommodating portion 237a opens toward the upstream side in the flow direction.

  Thereafter, the process proceeds to S2690, and this routine is once ended.

  According to such a configuration, even after the adjustment operation of the addition state of the additive AD is completed, even if the rotation angle of the collection filter 231 is held at the above-described resistance reduction angle as shown in FIG. The additive AD collected by the filter 231 can be favorably held in the storage portion 237a.

  Therefore, according to the present embodiment, it is possible to reduce the flow resistance of the coolant C by the collection filter 231 itself while appropriately setting a desired turbulent frictional resistance and heat transfer coefficient by a simple apparatus configuration and processing. Can be realized.

  FIG. 27 is an enlarged cross-sectional view showing the configuration of the twenty-third embodiment of the adjusting unit 23 shown in FIG. In the adjustment unit 23 of the present embodiment, the collection filter 231 is provided so as to be slidable along the flow path cross section. That is, in the present embodiment, the filter angle adjusting unit 233 is configured to be able to change the position of the collection filter 231 by adjusting the protruding amount of the shaft 232.

  In this embodiment, a filter storage unit 238 is provided. The filter storage portion 238 is a recess provided inside the circulation pipe 24 and is formed so as to store the collection filter 231. In this embodiment, the adjustment unit 23 is configured so that the collection filter 231 can be retracted to a position that does not overlap the flow path cross section.

  FIG. 28 is a flowchart for explaining an operation example of the adjustment unit 23 having the configuration of the twenty-third embodiment shown in FIG.

  The CPU in the electronic control unit ECU repeatedly executes the cooling system control routine 2800 shown in FIG. 28 every predetermined time.

  When the cooling system control routine 2800 is executed, first, the target value Ra of the dispersion amount of the additive AD in the coolant C is acquired based on the cooling water temperature Tw and the average load D in S2805.

  Next, in S2806, it is determined whether or not the current dispersion amount R is an appropriate amount as in S2606 (see FIG. 26). When the current dispersion amount R is not an appropriate amount (S2806 = No), the collection filter 231 is protruded into the coolant C flow path at S2807. Next, in S2808, it is determined whether or not the current dispersion amount R exceeds the current target value Ra. Depending on the determination result, “addition mode” (S2808 = No... S2830) or “recovery mode” (S2808 = Yes... S2840) is performed.

  On the other hand, when the current dispersion amount R is an appropriate amount (S2806 = Yes), the collection filter 231 is stored in the filter storage unit 238 as shown in FIG.

  Thereafter, the process proceeds to S2690, and this routine is once ended.

  According to such a configuration, after the operation of adjusting the addition state of the additive AD is completed, the collection filter 231 is retracted to a position that does not overlap with the flow path cross section, as shown in FIG. Therefore, the flow resistance of the coolant C by the collection filter 231 itself can be effectively reduced after the adjustment operation of the addition state of the additive AD is completed.

  In the configuration of the present embodiment, when the “recovery mode” (S2808 = Yes... S2840) is performed, the recovery state of the additive AD may be controlled by the amount of protrusion of the collection filter 231.

  FIG. 29A is an enlarged cross-sectional view showing the configuration of the twenty-fourth embodiment of the adjusting unit 23 shown in FIG. Referring to FIG. 29A, the adjustment unit 23 in the present embodiment includes a temperature sensitive rotation unit 239. The temperature sensitive rotating part 239 is arranged in a space through which the coolant C passes, that is, in a space inside the circulation pipe 24.

  A collecting filter 231 is fixed to one end of the shaft 232, and the other end of the shaft 232 is rotatably supported by the circulation pipe 24. The temperature sensitive rotating part 239 is provided between the one end part and the other end part of the shaft 232. The temperature sensitive rotation unit 239 is configured to be able to change the state (rotation angle) of the collection filter 231 in accordance with the temperature of the coolant C.

  FIG. 29B is a side view of the temperature-sensitive rotating unit 239 shown in FIG. 29A. Hereinafter, referring to FIG. 29A and FIG. 29B, the temperature-sensitive rotating part 239 includes a lever 239a, a temperature-sensitive deforming part 239b, and an urging part 239c.

  One end of the lever 239 a is fixed to the shaft 232 and is connected to the collection filter 231 via the shaft 232. That is, the lever 239a rotates around the shaft 232 together with the collection filter 231. A temperature-sensitive deformation portion 239b is connected to the other end portion of the lever 239a.

  The temperature-sensitive deformation portion 239b is configured to be able to change the rotation state of the collection filter 231 by being deformed according to the temperature of the coolant C.

  Specifically, in the present embodiment, the temperature-sensitive deformation portion 239b is configured by a coil spring-like shape memory alloy. Here, in FIG. 29A and FIG. 29B, the coolant C has a predetermined shape recovery temperature (Af point: Af point means the end temperature of transformation from the martensite phase to the parent phase during heating in the shape memory alloy. .), The shape of the temperature-sensitive deformation portion 239b is recovered, so that the lever 239a and the collection filter 231 have a predetermined collection angle (the collection filter 231 is substantially parallel to the flow path cross section). It is assumed that a state rotated to (angle) is shown.

  An urging portion 239c is connected to the other end portion of the lever 239a. The urging portion 239c is configured by a coil spring. The urging portion 239c pulls the other end portion of the lever 239a at a low temperature, thereby rotating the lever 239a in the counterclockwise direction to the state of the two-dot chain line in the figure while extending and deforming the temperature-sensitive deformation portion 239b. It is configured as follows.

  In such a configuration, the temperature of the coolant C is lower than the shape recovery temperature (for example, the Mf point or lower: the Mf point refers to a transformation end temperature from the parent phase to the martensite phase during cooling in the shape memory alloy. .), The temperature-sensitive deformation portion 239b made of a shape memory alloy can be easily deformed with a small external force. Therefore, the temperature-sensitive deformation portion 239b is easily extended and deformed by the pulling force of the biasing portion 239c. Thereby, the lever 239a rotates by a relatively large angle (75 ° to 90 °) from the solid line to the two-dot chain line in FIG. 29B.

  Therefore, when the temperature of the coolant C is low, the collection filter 231 rotates by a relatively large angle from the collection angle (see FIG. 29A) due to the counterclockwise rotation in FIG. 29B of the lever 239a. As a result, the additive AD collected by the collection filter 231 is released into the coolant C (over the protruding wall 237 even if it exists). That is, the addition operation of the additive AD is performed.

  On the other hand, when the temperature of the coolant C reaches a high temperature (the As point or higher: the As point refers to the transformation start temperature from the martensite phase to the parent phase during heating in the shape memory alloy), the temperature sensitive deformation portion 239b. The shape recovery starts, and the lever 239a and the collection filter 231 rotate toward the collection angle as the temperature of the coolant C rises. When the temperature of the coolant C becomes equal to or higher than the shape recovery temperature, the shape recovery of the temperature-sensitive deformation portion 239b is completed, and the rotation angle of the collection filter 231 is set to the collection angle.

  In this manner, the additive AD dispersed in the coolant C is collected by the collection filter 231 as the temperature of the coolant C increases. That is, the operation of collecting the additive AD is performed.

  According to the configuration of the present embodiment, the control of the dispersion state of the additive AD according to the temperature of the coolant C can be realized with a simple system configuration.

  <Modification of Cooling System> FIG. 30 is a schematic configuration diagram of a modification of the cooling system 1 shown in FIG.

  In the following description of the modified examples, members having the same configuration and function as those described in the above-described embodiment and the like are denoted by the same reference numerals as described above. Moreover, within the range which is not technically contradictory, description in the above-mentioned embodiment etc. shall be used. Furthermore, the reference numerals in the above-described embodiments and the like are appropriately cited. The same applies to other modified examples described later.

  Referring to FIG. 30, the cooling system 1 according to the modified example includes an adjustment unit communication path 241, a bypass flow path 242, and a distribution unit 243 in addition to the configuration of the above-described embodiment.

  The adjustment unit communication path 241 is a member that forms a flow path of the coolant C that connects the pump 21, the adjustment unit 23, and the engine 10, and has the same configuration as the circulation pipe 24. That is, the adjustment unit 23 is interposed in the adjustment unit communication path 241. In the present embodiment, an optical sensor 234 is interposed at the downstream end of the adjustment unit communication path 241 (near the entrance of the coolant C to the engine 10).

  The bypass flow path 242 is a member that configures the flow path of the coolant C that bypasses the adjustment unit 23, and has the same configuration as the circulation pipe 24. That is, the bypass flow path 242 is provided so as to branch from the adjustment unit communication path 241 on the upstream side of the adjustment unit 23 in the flow direction. Further, the bypass flow path 242 is provided so as to merge with the adjustment unit communication path 241 on the downstream side in the flow direction with respect to the adjustment unit 23 and on the upstream side in the flow direction with respect to the optical sensor 234.

  A distribution unit 243 is provided at a portion where the adjustment unit communication path 241 and the bypass flow path 242 branch. The distribution unit 243 is configured to change the flow rate ratio between the adjusting unit communication path 241 and the bypass flow path 242. Specifically, the distribution unit 243 can be configured by a flow control valve or a switching valve.

  In such a configuration, the adjustment state of the additive AD is adjusted by the adjustment unit 23 in the adjustment unit communication path 241. In this adjustment operation, processing similar to that shown in the above-described embodiments is performed. On the other hand, in the bypass flow path 242, the adjustment state of the additive AD by the adjustment unit 23 is not performed. The degree of adjustment of the addition state of the additive AD by the adjustment unit 23 can be controlled by the flow rate of the coolant C in the adjustment unit communication path 241.

  FIG. 31 is a flowchart illustrating an operation example of the cooling system 1 according to the modification illustrated in FIG. 30.

  The CPU in the electronic control unit ECU repeatedly executes a cooling system control routine 3100 shown in FIG. 31 every predetermined time.

  When the cooling system control routine 3100 is executed, first, the target value Ra of the dispersion amount of the additive AD in the coolant C is acquired based on the cooling water temperature Tw and the average load D in S3105.

  Next, in S3106, the current dispersion amount R is acquired, and it is determined whether this is an appropriate amount. If the current dispersion amount R is not an appropriate amount (S3106 = No), it is then determined in S3108 whether or not the current dispersion amount R exceeds the current target value Ra and will be described later according to the determination result. As described above, the “addition mode” or the “recovery mode” is performed. On the other hand, when the current dispersion amount R is an appropriate amount (S3106 = Yes), the distribution unit 243 is switched so that the entire amount of the coolant C flows to the bypass flow path 242 side.

  When the current dispersion amount R does not exceed the current target value Ra (S3108 = No), the “addition mode” is performed. In the “addition mode”, first, the release time Tr is acquired based on the difference between the current dispersion amount R and the target value Ra, the engine speed Ne, and the relationship (function or table) Ht (S3132). . In S3138, the distribution unit 243 is controlled such that the coolant C flows through the adjustment unit 23 (adjustment unit communication path 241) only during the release time Tr, and the addition (release) operation of the additive AD is performed.

  On the other hand, when the current dispersion amount R exceeds the current target value Ra (S3108 = Yes), the “collection mode” is performed. In this “recovery mode”, first, the recovery time Ts is acquired based on the difference between the current dispersion amount R and the target value Ra, the engine speed Ne, and the relationship (function or table) Gt (S3142). . In S3148, the distribution unit 243 is controlled so that the coolant C flows through the adjustment unit 23 (adjustment unit communication path 241) only during the collection time Ts, and the collection (collection) operation of the additive AD is performed. .

  Thereafter, the process proceeds to S3190, and this routine is once ended.

  Thus, in the present embodiment, the coolant C passes through the bypass flow path 242 at the time when the addition state of the additive AD is not adjusted by the adjustment unit 23. That is, the coolant C bypasses the adjustment part communication path 241 (adjustment part 23). Thereby, the flow resistance of the coolant C at the time can be suppressed.

  <Exemplary Enumeration of Other Modifications> In addition, as described above, the above-described embodiment, examples, and a representative modification of the present invention considered to be the best at the time of filing of the present application by the applicant. The representative embodiments and the like are merely examples. Therefore, the present invention is not limited to the above-described embodiment or the like.

  Therefore, it goes without saying that various modifications can be made to the above-described embodiment and the like within a range that does not change the essential part of the present invention. For example, the configurations and processes disclosed in the above-described embodiments and the like can be appropriately omitted or combinedly applied within a technically consistent range. That is, some of the configurations and processes disclosed in the above-described embodiments and the like can be selectively combined as appropriate.

  Hereinafter, some typical modifications will be exemplified. Needless to say, modifications are not limited to those described above and those listed below. In addition, a plurality of modified examples can be applied in a composite manner as appropriate within a technically consistent range.

  The present invention (especially those expressed functionally and functionally in the constituent elements constituting the means for solving the problems of the present invention) is based on the above-described embodiment and the description of the following modifications. Should not be construed as limited. Such a limited interpretation is unacceptable and improper for imitators, while improperly harming the applicant's interests (rushing to file under a prior application principle).

  (A) The coolant C is not limited to an aqueous system. Further, the material of the additive AD is not limited to the synthetic resin, and may be any substance that maintains the state of solid particles in the coolant C. Furthermore, the shape of the additive AD is not particularly limited.

  (B) The adjustment part 23 may be arrange | positioned rather than the pump 21 in the upstream in the said flow direction.

  (C) Apart from the collection filter 231, an addition unit for adding the additive AD may be provided. That is, the collection filter 231 only collects the additive AD, and the addition of the additive AD may be performed by means other than the collection filter 231.

  (D) The output unit that outputs a signal corresponding to the amount of the additive AD in the coolant C is not limited to the optical sensor 234. Further, the process according to the output of the output unit is not limited to the determination of the shortage of the amount of the additive AD, and can be used for the excessive determination.

  As the output unit, for example, instead of the optical sensor 234, a sensor configured to generate an output corresponding to a physical quantity (electric resistance value or the like) that changes based on the addition state of the additive AD in the coolant C is used. Can be used.

  Alternatively, the output unit estimates or calculates the addition state of the additive AD based on, for example, the temperature of the coolant C (temperature itself or temperature change rate), and generates an output corresponding to the estimated value or the calculated value. Can be configured.

  (E) Acquisition of the temperature of the coolant C (cooling water temperature Tw) may be performed by estimation (calculation) based on each parameter of engine control without using a cooling water temperature sensor.

  (F) Referring to FIGS. 2A and 2B, when the additive AD is released from the collection filter 231, the collection filter 231 is inverted (rotated 180 °) from the state shown in FIG. 2A. Also good.

  (G) The projecting wall 237 (see FIG. 23, etc.) other than the twenty-second embodiment is also formed with a large number of holes that make it difficult for the additive AD to pass therethrough while allowing the coolant C to pass therethrough relatively easily. May be.

  (H) The temperature-sensitive rotating unit 239 shown in FIG. 29A is not limited to the configuration shown in FIG. 29B and the above-described embodiment. For example, the temperature-sensitive deformation part 239b can be configured by bimetal or the like. In this case, the urging portion 239c shown in FIG. 29B can be omitted as appropriate.

  (I) Other elements that are functionally expressed in the elements constituting the means for solving the problems of the present invention are the specific structures disclosed in the above-described embodiments and modifications. In addition, any structure capable of realizing the operation / function is included.

1 is a schematic configuration diagram of an engine cooling system according to an embodiment of the present invention. It is an expanded sectional view which shows the structure of the 1st Example of the adjustment part shown by FIG. It is an expanded sectional view which shows the structure of the 1st Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 1st Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 2nd Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 3rd Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 4th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 5th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 6th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 7th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 8th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 9th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 10th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 11th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 12th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 13th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 14th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 15th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 16th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 17th Example of the adjustment part shown by FIG. It is a flowchart for demonstrating operation | movement of the 18th Example of the adjustment part shown by FIG. It is an expanded sectional view which shows the structure of the 19th Example of the adjustment part shown by FIG. It is an expanded sectional view which shows the structure of the 20th Example of the adjustment part shown by FIG. It is an expanded sectional view which shows the structure of the 21st Example of the adjustment part shown by FIG. It is an expanded sectional view which shows the structure of 22nd Example of the adjustment part shown by FIG. It is a top view of the collection filter shown by FIG. It is a flowchart for demonstrating the operation example of the adjustment part of the structure of the 22nd Example shown by FIG.24 and FIG.25. It is an expanded sectional view which shows the structure of the 23rd Example of the adjustment part shown by FIG. It is a flowchart for demonstrating the operation example of the adjustment part of a structure of the 23rd Example shown by FIG. It is an expanded sectional view which shows the structure of the 24th Example of the adjustment part shown by FIG. FIG. 29B is a side view of the temperature sensitive rotation unit shown in FIG. 29A. It is a schematic block diagram of the modification of the engine cooling system shown by FIG. It is a flowchart which shows the operation example of the engine cooling system of the modification shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine cooling system 10 ... Engine 20 ... Coolant circulation device 21 ... Pump 23 ... Adjustment part 24 ... Circulation pipe 231 ... Collection filter 232 ... Shaft 233 ... Filter angle adjustment part 234 ... Optical sensor 235 ... Crushing filter 235a ... Opening 236 ... Projection part 237 ... Projection wall 237a ... Accommodating part 238 ... Filter storage part 239 ... Temperature sensitive rotation part 239a ... Lever 239b ... Temperature sensitive deformation part 241 ... Adjustment part communication path 242 ... Bypass flow path 243 ... Distribution part C ... Coolant AD ... Additive ECU ... Electronic control unit

Claims (40)

In an engine cooling system configured to cool an engine by circulating a liquid cooling medium in a circulation path by a pump,
The engine cooling system, wherein the cooling medium contains an additive composed of solid particles. The engine cooling system according to claim 1,
The engine cooling system, wherein the additive is made of a polymer fiber. The engine cooling system according to claim 1 or 2,
An engine cooling system, further comprising an adjustment unit interposed in the circulation path and configured to adjust an addition state of the additive to the cooling medium. The engine cooling system according to claim 3,
The engine cooling system, wherein the adjustment unit includes a collection member configured to collect the additive in the cooling medium. The engine cooling system according to claim 4,
The engine cooling system, wherein the adjusting unit is configured to collect the additive in the cooling medium by the collecting member during high load operation. The engine cooling system according to claim 5,
The engine cooling system, wherein the adjusting unit is configured to collect the additive in the cooling medium by the collecting member when a high load operation continues for a predetermined time or more. The engine cooling system according to any one of claims 4 to 6,
The engine cooling system, wherein the adjustment unit is configured to adjust an addition state of the additive to the cooling medium by controlling a collection time of the additive by the collection member. . An engine cooling system according to any one of claims 4 to 7,
The engine cooling system, wherein the adjustment unit is configured to collect the additive in the cooling medium by the collecting member when the cooling medium is discharged from the circulation path. An engine cooling system according to any one of claims 4 to 8,
An engine cooling system configured to increase an amount of the cooling medium delivered by the pump when the additive is collected by the collecting member. An engine cooling system according to any one of claims 3 to 9,
The engine cooling system, wherein the adjustment unit is configured to release the additive into the cooling medium. The engine cooling system according to any one of claims 4 to 10,
The engine cooling system, wherein the adjustment unit is configured to be able to release the additive collected by the collection member from the collection member into the cooling medium. The engine cooling system according to any one of claims 3 to 11,
An engine cooling system configured to be able to determine an abnormality of the adjustment unit based on a temperature of the cooling medium. The engine cooling system according to any one of claims 3 to 12,
The adjustment unit includes a crushing unit configured to crush the aggregate of the additive,
The engine cooling system, wherein the crushing part is interposed in the circulation path at a downstream side in a flow direction of the cooling medium from a position where the additive is discharged into the cooling medium. . An engine cooling system according to claim 13,
The engine cooling system according to claim 1, wherein the crushing section is composed of a plate-like member having a large number of openings through which primary particles of the additive can pass. An engine cooling system according to claim 13,
The engine cooling system according to claim 1, wherein the crushing portion is constituted by a protruding portion provided so as to protrude in the circulation path. The engine cooling system according to any one of claims 11 to 15,
The engine cooling system, wherein the adjustment unit is configured to adjust an addition state of the additive to the cooling medium by controlling a discharge time of the additive. The engine cooling system according to any one of claims 11 to 16,
The engine cooling system, wherein the adjustment unit is configured to release the additive into the cooling medium when the engine is stopped. The engine cooling system according to any one of claims 11 to 17,
The engine cooling system, wherein the adjustment unit is configured to release the additive into the cooling medium when the engine is started. The engine cooling system according to any one of claims 11 to 18, comprising:
The engine cooling system, wherein the adjustment unit is configured to intermittently release the additive into the cooling medium. The engine cooling system according to any one of claims 11 to 19,
An engine cooling system configured to increase a delivery amount of the cooling medium by the pump when the additive is discharged into the cooling medium by the adjusting unit. The engine cooling system according to any one of claims 11 to 20,
An engine cooling system configured to reduce a delivery amount of the cooling medium by the pump when the additive is discharged into the cooling medium by the adjusting unit. The engine cooling system according to any one of claims 4 to 20, comprising:
The said cooling member is comprised from the filter, The engine cooling system characterized by the above-mentioned. An engine cooling system according to claim 22,
The engine cooling system, wherein the adjustment unit is configured to change a projected area of the filter with respect to a cross section orthogonal to the flow direction in the circulation path. 24. The engine cooling system of claim 23, wherein
The filter is configured to be rotatable about an axis parallel to the cross section,
The engine cooling system, wherein the adjustment unit is configured to change a rotation angle of the filter. The engine cooling system according to claim 24, comprising:
The end of the filter is provided with a protruding wall provided to protrude from the filter,
An engine cooling system, wherein an accommodation portion including a space surrounded by the filter and the protruding wall is provided in the adjustment portion. The engine cooling system according to any one of claims 23 to 25, wherein:
The filter is slidable along the cross section,
The engine cooling system, wherein the adjustment unit is configured to be able to change a position of the filter. 27. The engine cooling system of claim 26, wherein
The engine cooling system, wherein the adjustment unit is configured to retract the filter to a position that does not overlap the cross section. The engine cooling system according to any one of claims 23 to 27,
The adjustment unit includes a temperature-sensitive deformation unit that deforms according to the temperature of the cooling medium,
The engine cooling system, wherein the temperature-sensitive deformation unit is configured to change a state of the filter by being deformed according to a temperature of the cooling medium. The engine cooling system according to any one of claims 22 to 28, wherein:
The engine cooling system according to claim 1, wherein the filter is subjected to a surface treatment so that the additive is easily detached. 30. The engine cooling system according to any one of claims 1 to 29, wherein:
The engine cooling system, wherein the additive is subjected to a surface treatment for imparting releasability. The engine cooling system according to any one of claims 3 to 30, wherein
The circulation path includes an adjustment unit communication path and a bypass flow path that bypasses the adjustment unit communication path.
The engine cooling system, wherein the adjustment unit is interposed in the adjustment unit communication path. 32. The engine cooling system according to claim 31, wherein
The engine cooling system according to claim 1, wherein the adjustment unit includes a distribution unit configured to change a flow rate ratio between the adjustment unit communication path and the bypass flow path. The engine cooling system according to any one of claims 3 to 31,
An output unit that outputs a signal corresponding to the amount of the additive in the cooling medium;
The engine cooling system, wherein the adjustment unit is configured to adjust an addition state of the additive to the cooling medium in accordance with an output of the output unit. An engine cooling system according to claim 33,
The engine cooling system, wherein the output unit includes an optical sensor interposed in the circulation path. An engine cooling system according to claim 33,
The engine cooling system is configured to estimate an addition state of the additive based on a temperature of the cooling medium and generate an output corresponding to the estimated value. 36. The engine cooling system according to any one of claims 33 to 35, comprising:
An engine cooling system configured to be able to determine whether the additive amount is excessive or insufficient in accordance with a signal from the output unit. In a liquid engine cooling medium that cools the engine by circulating in the circulation path,
An engine cooling medium comprising an additive composed of solid particles. The engine coolant of claim 37,
The engine cooling medium, wherein the solid particles are made of polymer fibers. A coolant additive that is added to a liquid engine coolant that cools the engine by circulating in the circulation path,
An additive for cooling medium, comprising a substance that maintains a state of solid particles in the engine cooling medium. The coolant additive according to claim 39,
An additive for a cooling medium, comprising a polymer fiber.

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