JP5027065B2 - Heat storage system - Google Patents

Description

  The present invention relates to a heat storage system, and more particularly to a heat storage system that can effectively use heat generated by an engine.

  2. Description of the Related Art Conventionally, a heat storage type heat supply device is known in which a heat exchange medium directly exchanges heat with a heat storage body that stores heat by a state change between a solid and a liquid (see Patent Document 1).

JP 2006-266605 A

In the heat storage type heat supply device, the heat exchange medium and the heat storage body do not perform indirect heat exchange via, for example, a pipe wall, and the heat exchange medium and the heat storage body directly contact and perform heat exchange. . For this reason, efficient heat storage and heat dissipation can be performed.
It is conceivable that such an apparatus is mounted on an engine and applied to a heat storage system that uses oil as a lubricant as a heat exchange medium for warming up the engine. In this case, the engine itself becomes a heat source, while the engine itself becomes a heated object. For this reason, it is also assumed that the engine is stopped in a state where the oil is not sufficiently warmed and the amount of heat stored in the heat storage body is small. In this case, the warm-up at the next engine start is not performed quickly.
In consideration of such circumstances, the heat storage type heat supply device has room for improvement in order to be applied to a heat storage system in which the device is mounted on an engine.

  Then, this invention makes it a subject to provide the thermal storage system which performs efficient thermal storage and heat dissipation according to the state of an engine, and enables efficient heat utilization in a system.

  In order to solve such a problem, the heat storage system disclosed in this specification is incorporated in an oil circulation path through which oil used for lubrication inside the engine circulates, and stores heat by changing the state of the oil, solid, and liquid. A heat storage tank that houses the heat storage body, a bypass path that bypasses the heat storage body housed inside the heat storage tank, a feed pump that circulates oil through the oil circulation path and the bypass path, and the heat storage body A control valve that adjusts the amount of oil that passes through and the amount of oil that passes through the bypass path, temperature measuring means that measures the engine temperature, and the oil temperature in the heat storage tank that is the temperature of the oil existing in the heat storage tank. Temperature control means for measuring, and the control valve so that when the oil temperature in the heat storage tank is higher than the engine temperature, the amount of oil passing through the heat storage body is greater than the amount of oil passing through the bypass path Control Control means for controlling the control valve such that when the oil temperature in the heat storage tank is lower than the engine temperature, the amount of oil passing through the heat storage body is less than the amount of oil passing through the bypass path; , Is provided.

  When the control means determines that the oil temperature in the heat storage tank is lower than the engine temperature and the engine has been warmed up, the amount of oil passing through the heat storage body passes through the bypass path. The control valve can be controlled so as to be larger than the oil amount.

  In such a heat storage system, a heat storage body having a specific gravity different from that of oil is selected and employed. Thereby, oil and a thermal storage body are isolate | separated up and down within a thermal storage tank. In the heat storage system disclosed in the present specification, the amount of oil passing through the heat storage body and the amount of oil passing through the bypass path are adjusted according to the state of the engine. When the heat storage system wants to use the heat stored in the heat storage body for warming up the engine, the heat storage system increases the amount of oil passed through the heat storage body. The heat storage system also increases the amount of oil that passes through the heat storage body when it is desired to store the combustion heat of the engine in the heat storage body. On the other hand, after using the heat stored in the heat accumulator when the engine is warmed up, the oil bypasses the heat accumulator. That is, the heat storage system increases the amount of oil that passes through the bypass flow path. Thereby, the heat capacity in the system through which oil circulates can be reduced, and the engine can be warmed up quickly. The bypass path may be a path that bypasses the heat storage body by bypassing the entire heat storage tank.

  In such a heat storage system, a cooling water exhaust heat recovery unit that performs heat exchange between the engine exhaust flow and the engine cooling water, and the engine exhaust flow and the oil circulation path are circulated. Exhaust heat recovery is performed in the oil exhaust heat recovery unit disposed downstream of the cooling water exhaust heat recovery unit and the cooling water exhaust heat recovery unit. The cooling water exhaust heat recovery switching means for switching whether or not to perform, the oil exhaust heat recovery switching means for switching whether or not to perform exhaust heat recovery in the oil exhaust heat recovery device, and the oil circulation path It can be set as the structure provided with the temperature measurement means which measures the temperature of the oil to perform, and the temperature measurement means which measures the cooling water temperature. When the temperature of the oil flowing through the oil circulation path exceeds a threshold value for avoiding overheating of the oil and the cooling water temperature has a margin with respect to the overheat determination temperature, the control means The cooling water exhaust heat recovery switching means is controlled to perform exhaust heat recovery in the exhaust heat recovery device, and the oil exhaust heat recovery switching means is controlled to perform exhaust heat recovery in the oil exhaust heat recovery device.

  The engine exhaust heat can be efficiently utilized by the cooling water exhaust heat recovery unit and the oil exhaust heat recovery unit. The oil exhaust heat recovery unit warms the oil circulating in the oil circulation path using the exhaust heat. The warmed oil is supplied to the heat storage tank. Thereby, heat can be stored in the heat storage tank. By utilizing the exhaust heat, the oil temperature can be increased immediately after the engine is started, and the heat storage amount can be maintained.

  When exhaust heat is applied to oil, it is required to prevent overheating of the oil in order to suppress deterioration of the oil and prevent ignition. Therefore, when the temperature of the oil flowing through the oil circulation path exceeds the threshold for avoiding overheating of the oil and the cooling water temperature has a margin with respect to the overheat determination temperature, the exhaust water heat recovery is performed in the cooling water exhaust heat recovery device. Do. Thereby, the temperature of the exhaust flow supplied to the oil exhaust heat recovery device later can be lowered. In the oil exhaust heat recovery unit, the oil obtains heat from the exhaust stream at a reduced temperature. As a result, heat can be exchanged between the exhaust stream and the oil while preventing overheating of the oil, and a high heat storage amount can be maintained.

  A cooling water exhaust heat recovery unit that exchanges heat between the exhaust flow of the engine and the cooling water of the engine, a cooling water that exchanges heat with the cooling water exhaust heat recovery unit, and the oil circulation path. It can also be set as the thermal storage system provided with the oil exhaust heat recovery device which heat-exchanges with the said oil to circulate. The oil that circulates in the oil circulation path is configured to obtain exhaust heat by heat exchange with cooling water. That is, exhaust heat recovery is performed using cooling water as a medium. This avoids heat exchange above the boiling point of the cooling water. As a result, overheating of the oil is prevented. For this reason, it is possible to omit monitoring the temperature of the oil heat-exchanged by the oil exhaust heat recovery device and controlling the temperature of the oil.

  In the heat storage system disclosed in the present specification, oil that circulates in the oil circulation path serves as a heat exchange medium as engine lubricating oil. And efficient heat exchange is performed between both by contacting a thermal storage body directly in a thermal storage tank. Moreover, the high heat storage amount of a thermal storage body can be maintained by utilizing the heat | fever of exhaust flow for thermal storage. The heat stored in the heat storage body is efficiently dissipated and used to warm up the engine.

  The engine temperature may be a temperature at which the state of the engine, in particular, the warm-up state can be grasped. For example, the cooling water temperature or the temperature of the oil flowing through the cylinder block or the cylinder head can be employed. Further, the temperature of the cylinder block or the cylinder head can be adopted as the engine temperature.

  The engine temperature is compared with the oil temperature in the heat storage tank, and based on the result, the amount of oil passing through the heat storage body and the amount of oil passing through the bypass path are adjusted.

  A three-way valve can be used as the control valve that adjusts the amount of oil passing through the heat storage body and the amount of oil passing through the bypass path. The control means adjusts the amount of oil passing through each path by adjusting the opening of the three-way valve.

  In the heat storage system disclosed herein, conventionally known latent heat storage materials such as erythritol and sodium acetate trihydrate can be used as the heat storage body. The latent heat storage material can be appropriately selected depending on the configuration of the heat storage system.

  According to the heat storage system disclosed in the present specification, the engine temperature and the oil temperature in the heat storage tank are compared, and the amount of oil passing through the heat storage body and the amount of oil passing through the bypass path are adjusted based on the result. Since it did in this way, according to the state of an engine, heat storage and heat dissipation are performed efficiently, and the efficient heat utilization in a system is attained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  1 and 2 are explanatory views schematically showing a schematic configuration of a heat storage system 1 incorporated in the engine 2. 1 and FIG. 2 are different from each other in the open state of the control valve 12 which is a three-way valve.

  The heat storage system 1 includes a heat storage tank 4 incorporated in an oil circulation path 3 through which oil used for lubrication inside the engine 2 circulates.

  The heat storage tank 4 has an internal space 4a, and a heat insulating material 4b made of foamed foam resin is attached to the outer peripheral portion. The internal space 4a accommodates oil 5 and a latent heat storage material 6 that is a heat storage body. The internal space 4 a is divided into an upper layer portion 4 a 1 that stores the oil 5 and a lower layer portion 4 a 2 that stores the latent heat storage material 6, depending on the specific gravity difference between the oil 5 and the latent heat storage material 6.

  An oil supply pipe 7 is provided in the lower layer portion 4 a 2 of the heat storage tank 4. The oil supply pipe 7 is connected to the oil circulation path 3 and opens to the upper layer portion 4a1. The oil supply pipe 7 is formed with a number of oil supply holes 7a for supplying oil to the lower layer portion 4a2. Further, the oil supply pipe 7 is provided with an on-off valve 7b. A temperature sensor 8 for measuring the temperature of the latent heat storage material 6 is mounted in the lower layer part 4a2, and the opening / closing valve 7b is controlled to open / close according to the measured value of the temperature sensor 8. The oil supply pipe 7 enables the oil 5 to be supplied into the heat storage tank 4 when the latent heat storage material 6 is in a solid state. When the latent heat storage material 6 is in a solid state, the oil 5 cannot pass through the latent heat storage material 6. When it is determined from the measured value of the temperature sensor 8 that the latent heat storage material 6 is in a solid state, the on-off valve 7b is opened, and the oil 5 is directly supplied to the upper layer portion 4a1. At this time, the oil supply hole 7a is closed by the solid latent heat storage material 6. When the temperature of the latent heat storage material 6 rises and the latent heat storage material 6 starts to melt, the oil 5 is supplied to the latent heat storage material 6 side through the oil supply hole 7a. If it is determined that the latent heat storage material 6 starts to melt based on the measured value of the temperature sensor 8, the on-off valve 7b is closed.

  The heat storage system 1 includes a bypass path 9 that bypasses the latent heat storage material 6 accommodated in the heat storage tank 4. The bypass path 9 bypasses the latent heat storage material 6 by connecting the upstream and downstream of the heat storage tank 4. That is, the bypass path 9 branches from the oil circulation path 3 upstream of the heat storage tank 4 and joins the oil circulation path 3 downstream of the heat storage tank 4. A control valve 12 is provided at the branch point 11. The control valve 12 is a three-way valve, and adjusts the amount of oil that passes through the latent heat storage material 6 in the heat storage tank 4 and the amount of oil that passes through the bypass path 9.

  The heat storage system 1 includes an electric feed pump 10 on the oil circulation path 3. The feed pump 10 discharges and circulates oil in the direction indicated by the arrow 10a in the figure. The heat storage tank 4 is incorporated downstream of the feed pump 10. The oil circulation path 3 returns to the engine 2 again on the downstream side of the heat storage tank 4.

  The heat storage system 1 includes a temperature sensor 13 that measures the oil temperature inside the engine 2. The oil temperature inside the engine 2 is an example of the engine temperature. The heat storage system 1 includes a temperature sensor 14 in the heat storage tank 4 that measures the temperature of the heat storage tank oil, which is the temperature of oil present in the heat storage tank 4.

  The heat storage system 1 further includes a temperature sensor 22 that measures the temperature (cooling water temperature) of the cooling water circulating in the engine 2. The heat storage system 1 also includes an electric water pump 23 that circulates cooling water inside the engine 2. Furthermore, an oil discharge amount sensor 24 is provided on the oil circulation path 3.

  Furthermore, the heat storage system 1 includes an ECU 50 that functions as a control means in the present invention. The ECU 50 is an arithmetic logic circuit including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The ECU 50 is electrically connected to the on-off valve 7b, the feed pump 10, the control valve 12, the temperature sensors 8, 13, 14, 22, the water pump 23, and the discharge amount sensor 24, respectively. In addition, a program for performing the control described below is stored.

  Hereinafter, control performed by the ECU 50 will be described. The ECU 50 performs heat storage-warm-up control for switching between a heat storage state of the latent heat storage material 6 and a warm-up state of the engine 2, exhaust heat recovery control for imparting exhaust heat to the oil while preventing oil overheating, oil Clogging elimination control for eliminating clogging by the latent heat storage material 6 in the circulation path 3 is performed.

First, an example of heat storage / warm-up control will be described with reference to the flowchart shown in FIG.
The basic policy of heat storage-warm-up control is as follows.
(1) When the oil temperature in the heat storage tank measured by the temperature sensor 14 is higher than the oil temperature inside the engine 2 measured by the temperature sensor 13 (hereinafter referred to as “engine oil temperature”), the latent heat storage material 6 The control valve 12 is controlled so that the amount of oil passing through the inside becomes larger than the amount of oil passing through the bypass path 9. Thereby, warm-up of the engine 2 is promoted.
(2) When the oil temperature in the heat storage tank measured by the temperature sensor 14 is lower than the engine internal oil temperature measured by the temperature sensor 13, the amount of oil that passes through the latent heat storage material 6 passes through the bypass path 9. The control valve 12 is controlled to be less than the amount. As a result, the heat capacity in the oil circulation path 3 is reduced so as not to prevent warm-up due to the combustion heat of the engine 2.
(3) When it is determined that the oil temperature in the heat storage tank measured by the temperature sensor 14 is lower than the engine internal oil temperature measured by the temperature sensor 13 and the engine 2 has been warmed up, the latent heat storage material 6 The control valve 12 is controlled so that the amount of oil passing through the inside becomes larger than the amount of oil passing through the bypass path 9. Thereby, the heat generated by the engine 2 is stored in the latent heat storage material 6.

  First, in step S1, the ECU 50 determines whether the difference between the oil temperature in the heat storage tank measured by the oil temperature sensor 14 and the engine oil temperature measured by the temperature sensor 13 is greater than the temperature T1. The temperature T1 is defined in advance as a temperature difference at which the engine 2 can be effectively warmed up using the heat storage of the latent heat storage material 6. If the difference between the oil temperature in the heat storage tank and the oil temperature in the engine is greater than the temperature T1, and the oil temperature in the heat storage tank is higher than the oil temperature in the engine, it is determined YES and the process proceeds to step S2. On the other hand, if NO is determined, the process proceeds to step S3.

  In step S2, the control valve 12 is commanded to increase the flow rate of oil toward the latent heat storage material 6 side. Thereby, the control valve 12 will be in the state which distribute | circulates oil to the thermal storage tank 4 side, as shown in FIG. As a result, the oil passes through the latent heat storage material 6, and the oil temperature can be raised by the stored heat. Thereby, warm-up of the engine 2 is promoted.

  In step S3, it is determined whether or not the engine internal oil temperature is higher than the temperature T2. The temperature T2 is a value that serves as a criterion for determining whether or not the engine 2 has been warmed up. If the engine internal oil temperature is higher than the temperature T2, it is determined that the engine 2 has been warmed up. If YES is determined in the step S3, the process proceeds to a step S4. On the other hand, if NO is determined in step S3, the process proceeds to step S5.

  In step S4, the control valve 12 is commanded to increase the flow rate of oil to the latent heat storage material 6 as in the process in step S2. Thereby, the control valve 12 will be in the state which distribute | circulates oil to the thermal storage tank 4 side, ie, the latent heat storage material 6, side, as shown in FIG. As a result, the heat generated in the engine 2 can be stored in the latent heat storage material 6. The heat storage of the latent heat storage material 6 is used to promote warm-up when the engine 2 is started next time.

  In step S5, the control valve 12 is commanded to increase the flow rate of oil to the bypass path 9 side. Thereby, the control valve 12 will be in the state which distribute | circulates oil to the bypass path 9 side, as shown in FIG. As a result, the heat capacity in the oil circulation path 3 is reduced so that warming up by the combustion heat of the engine 2 is not hindered. After the engine 2 is started, the initial warm-up proceeds using heat storage of the latent heat storage material 6. However, after the heat storage of the latent heat storage material 6 is consumed, the engine 2 is warmed up by its own combustion heat. In this case, if oil is circulated through the latent heat storage material 6, the combustion heat of the engine 2 is lost to the latent heat storage material 6, and the warm-up of the engine 2 is delayed. Therefore, in this case, the bypass path 9 is allowed to pass.

  The above description is an example of heat storage / warm-up control. Note that the warm-up state can be determined based on the coolant temperature measured by the temperature sensor 22. The control valve 12 not only distributes the total amount of oil flowing to either the latent heat storage material 6 side or the bypass path 10 side, but also to the latent heat storage material 6 side and the bypass path 9 according to the state of the engine 2. You may make it distribute to a side in a desired ratio.

  Next, clogging elimination control will be described with reference to FIGS. In the heat storage system 1, the oil 5 and the latent heat storage material 6 are in contact with each other in the heat storage tank 4. The latent heat storage material 6 may mix with the oil 5 when the temperature rises and melts. The latent heat storage material 6 mixed with the oil 5 may flow out into the oil circulation path 3. When the latent heat storage material 6 that has flowed out into the oil circulation path 3 changes to a solid state, the oil circulation path 3 becomes clogged. Therefore, clogging elimination control is performed to deal with such a situation.

  FIG. 4 is a flowchart showing an example of clogging elimination control. FIG. 5 is a flowchart showing another example of clogging elimination control. FIG. 6 is a flowchart showing still another example of clogging elimination control.

First, clogging elimination control based on the flowchart shown in FIG. 4 will be described.
First, in step S11, the feed pump 10 oil discharge amount is confirmed. The oil discharge amount is confirmed based on the data acquired by the discharge amount sensor 24. This confirmation is performed at the timing when the feed pump 10 is operating under a normal load. After finishing the process of step S11, it progresses to step S12. In step S12, it is determined whether or not the oil discharge amount confirmed in step S11 is less than a predetermined discharge amount Q1. The discharge amount Q1 is a value determined based on the discharge amount when the feed pump 10 is operated with a normal load in a state where the oil circulation path 3 is not clogged and no abnormality is observed. Since the feed pump 10 is electric, its load is controlled by the current value. When the feed pump 10 is operating at a normal load and the discharge amount Q1 is below, it is assumed that the oil circulation path 3 is clogged with the solidified latent heat storage material 6. If YES is determined in the step S12, the process proceeds to a step S13. On the other hand, if NO is determined in step S12, the process proceeds to step S19, where it is determined that the latent heat storage material 6 is not clogged, and the process is terminated.

  In step S13, the water pump 13 is stopped for t1 seconds. When the water pump 13 is stopped, the circulation of the cooling water in the engine 2 is stopped. Thereby, the temperature of the engine 2 rises. When the temperature of the engine 2 rises, the oil temperature also rises. When the temperature of the oil rises, the latent heat storage material 6 clogged in the oil circulation path 3 is melted. If the latent heat storage material 6 melts and becomes a liquid, it can be distributed with oil, and clogging is eliminated.

  In step S14, which is performed subsequent to the processing in step S13, a command is issued so that the feed pump 10 becomes a normal load. Thereafter, in step S15, the oil discharge amount is confirmed again in the same manner as in step S11. Further, following step S15, the process of step S16 is performed. In step S16, it is determined whether or not the oil discharge amount is less than the discharge amount Q1 in the same manner as in step S12. When YES is determined in step S16, the process proceeds to step S17, where it is determined that the latent heat storage material 6 is not clogged and the latent heat storage material 16 is clogged, and the process is terminated. In this case, it is possible to take measures such as turning on a warning lamp.

  On the other hand, if NO is determined in step S16, the process proceeds to step S18. In step S18, it is determined that the clogging of the latent heat storage material 6 has been resolved, and the process is terminated.

  By performing such control, clogging of the oil circulation path 3 can be eliminated. As a result, warm-up of the engine 2 can be promoted and the heat storage efficiency of the latent heat storage material 6 can be improved.

  In addition, you may make it grasp | ascertain the load of the feed pump 10 from pump rotation speed instead of an electric current value. The decrease in the oil discharge amount is a decrease in the oil flow rate, a decrease in the engine oil pressure, and whether or not the difference between the oil temperature in the engine and the oil temperature in the oil circulation path 3 acquired by the oil temperature sensor 21 is greater than a previously acquired conforming value. It can be set as the structure judged based on.

  Next, another example of clogging elimination control will be described with reference to the flowchart shown in FIG.

  The flowchart shown in FIG. 5 is different from the flowchart shown in FIG. 4 in the process in step S13 in the flowchart shown in FIG. 4 and the process in step S23 in the flowchart shown in FIG. Other processes are common to both controls. That is, the processing of step S21 and step S22 in the flowchart shown in FIG. 5 is common to step S11 and step S12 in the flowchart shown in FIG. Further, the processes in steps S24 to S29 are common to the processes in steps S14 to S19. Detailed description of common processing is omitted.

  In step S23, the load of the feed pump 10 is increased. Try increasing the load on the feed pump 10 and increasing the oil flow rate to flush the clog. Thus, clogging due to the latent heat storage material 6 can also be eliminated by increasing the load of the feed pump 10.

  Next, still another example of clogging elimination control will be described with reference to the flowchart shown in FIG.

  The clogging elimination control shown in the flowchart in FIG. 6 is obtained by newly adding steps S3-1 and S3-2 to the heat storage / warm-up control shown in the flowchart in FIG. That is, the processing of step S3-1 and step S3-2 is performed after the processing of step S3. In the heat storage-warm-up control shown in the flow chart of FIG. 3, when it is determined YES in step S3, the flow rate to the latent heat storage material 6 side is immediately increased. Thereby, heat is stored in the latent heat storage material 6. In the clogging elimination control, after the process in step S3, the oil discharge amount is confirmed in step S3-1. Subsequently, in step S3-2, it is determined whether the oil discharge amount is less than Q1. As a result, if YES is determined, the process proceeds to step S5. That is, the oil flow rate on the bypass path 9 side is increased. Such control is performed for the following reason.

  After determining that the engine 2 has been warmed up based on the oil temperature inside the engine, heat can be stored by flowing the oil to the latent heat storage material 6 side. On the other hand, if the oil is circulated to the bypass path 9 despite the completion of warm-up, the latent heat storage material 6 is not stored with heat, and the temperature of the oil circulating in the oil circulation path 3 rises. If the oil temperature in the oil circulation path 3 rises, the latent heat storage material 6 that is solid and causes clogging can be melted and returned to a liquid. Thereby, clogging of the oil circulation path 3 can be eliminated.

  As described above, according to the heat storage system 1, heat storage and heat dissipation are efficiently performed according to the state of the engine 2, and efficient heat utilization in the system becomes possible.

  Next, Example 2 will be described. In addition to the configuration of the heat storage system 1 of the first embodiment, the heat storage system 55 of the second embodiment further performs cooling to exchange heat between the exhaust flow of the engine 2 flowing through the exhaust pipe 15 and the cooling water of the engine 2. A water exhaust heat recovery unit 16 is provided. An exhaust pipe 15 and a cooling water pipe 17 through which the cooling water flows are drawn into the cooling water exhaust heat recovery unit 16. FIG. 9 shows the internal configuration of the cooling water exhaust heat recovery unit 16. The exhaust pipe 15 is divided into a main pipe 15 a and a bypass pipe 15 b that bypasses the main pipe 15 a inside the cooling water exhaust heat recovery unit 16. The bypass pipe 15 b is disposed so as to contact the cooling water pipe 17. A switching valve 18 is provided at a branch point between the main pipe 15a and the bypass pipe 15b. The switching valve 18 switches whether the exhaust flow flows to the main pipe 15a or the bypass pipe 15b, and is an example of the cooling water exhaust heat recovery switching means in the present invention. When the exhaust flow is circulated to the bypass pipe 15b side by the switching valve 18, the exhaust heat is recovered in the cooling water.

  The heat storage system 55 further includes an oil exhaust heat recovery device 19 that exchanges heat between the exhaust flow of the engine 2 that circulates in the exhaust pipe 15 and the oil that circulates in the oil circulation path 3. The oil exhaust heat recovery unit 19 is disposed downstream of the cooling water exhaust heat recovery unit 16 with respect to the exhaust flow. As a result, an exhaust stream having a temperature lower than that of the exhaust stream introduced into the cooling water exhaust heat recovery unit 16 is introduced into the oil exhaust heat recovery unit 19. The exhaust pipe 15 and the oil circulation path 3 are drawn into the oil exhaust heat recovery unit 19. FIG. 10 shows the internal configuration of the oil exhaust heat recovery unit 19. The exhaust pipe 15 is divided into a main pipe 15 a and a bypass pipe 15 c that bypasses the main pipe 15 a inside the oil exhaust heat recovery unit 19. The bypass pipe 15 c is disposed so as to contact the oil circulation path 3. A switching valve 20 is provided at a branch point between the main pipe 15a and the bypass pipe 15c. The switching valve 20 switches whether the exhaust flow is caused to flow through the main pipe 15a or the bypass pipe 15c, and is an example of the oil exhaust heat recovery switching means in the present invention. When the switching valve 20 causes the exhaust flow to flow toward the bypass pipe 15c, the exhaust heat is recovered in the oil.

  The heat storage system 55 includes a temperature sensor 21 that measures the temperature of oil flowing through the oil circulation path 3 downstream of the oil exhaust heat recovery unit 19 in the oil circulation path 3. The oil temperature of the oil circulating in the oil circulation path 3 can be measured by a temperature sensor 13 provided in the engine 2. Nevertheless, the reason why the temperature sensor 21 is provided is as follows. Oil may be deteriorated or ignited if overheated. For this reason, it is necessary to control the oil not to be overheated. The oil circulating in the oil circulation path 3 obtains heat from the exhaust stream in the oil exhaust heat recovery unit 19. For this reason, the oil temperature becomes higher downstream of the oil exhaust heat recovery unit 19. Therefore, it is desirable that the control for avoiding overheating of the oil is performed based on the oil temperature downstream of the oil exhaust heat recovery unit 19. For this reason, a temperature sensor 21 is provided downstream of the oil exhaust heat recovery unit 19. On the other hand, the temperature sensor 13 measures the oil temperature used when judging the state of the engine 2 such as the warm-up state of the engine 2.

  The temperature sensor 21 and the switching valves 18 and 20 are electrically connected to the ECU 50. Since the other components are basically not different from the heat storage system 1 of the first embodiment, the common components are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted. .

Also in such a heat storage system 55, the same heat storage-warm-up control and clogging elimination control as those in the heat storage system 1 of the first embodiment are performed. The heat storage / warm-up control is performed based on the flowchart shown in FIG. 3, and the clogging elimination control is performed based on any of the flowcharts shown in FIGS. The detailed explanation is omitted.
In the heat storage system 55, waste heat recovery control is performed in addition to heat storage-warm-up control and clogging elimination control. An example of the exhaust heat recovery control will be described with reference to the flowchart shown in FIG. 11 and the flowchart shown in FIG.

  The purpose of exhaust heat recovery control is to apply exhaust heat to the oil while preventing overheating of the oil, and efficiently store the heat in the latent heat storage material 6. Specifically, the switching valve 18 incorporated in the cooling water exhaust heat recovery unit 16 and the switching valve 20 incorporated in the oil exhaust heat recovery unit 19 are controlled. The switching valve 18 and the switching valve 20 can change the valve opening state separately according to the request. If the switching valve 18 is controlled so that the exhaust flow flows to the bypass pipe 15b as shown in FIG. 9A, the cooling water can be warmed. Warming up the engine 2 can be promoted by warming the cooling water. The oil can be warmed by controlling the switching valve 20 and allowing the exhaust flow to flow through the bypass pipe 15c as shown in FIG. By warming the oil, it is possible to promote warm-up and heat storage in the latent heat storage material 6. However, overheating of the oil must be avoided.

  FIG. 11 is a normal control flow diagram of the switching valve 20 incorporated in the oil exhaust heat recovery unit 19. First, in step S31, it is determined whether or not the engine internal oil temperature measured by the oil temperature sensor 13 is lower than the temperature T4. The temperature T4 is a value determined in advance as an upper limit value of a recommended temperature range in which the oil can be used without being overheated. The temperature T4 is a value higher than the temperature T2. When it is determined YES in step S31, that is, when it is determined that the engine internal oil temperature is lower than the temperature T4, the process proceeds to step S32. In step S32, the switching valve 20 issues a command to flow the exhaust flow to the exhaust heat recovery side, that is, the bypass pipe 15c. Thereby, the switching valve 20 will be in the state which flows an exhaust flow to the bypass pipe 15c, as shown to Fig.10 (a). Since the bypass pipe 15c is in contact with the oil circulation path 3, the temperature of the oil rises. As a result, the warm-up effect of the engine 2 and the heat storage effect on the latent heat storage material 6 are improved.

  On the other hand, when NO is determined in step S31, when it is determined that the engine internal oil temperature is higher than the temperature T4, the process proceeds to step S33. In step S33, the switching valve 20 issues a command to flow the exhaust flow to the exhaust heat non-recovery side, that is, the main pipe 15a. Thereby, the switching valve 20 will be in the state which sends an exhaust flow to the main pipe 15a, as shown in FIG.10 (b). Since the main pipe 15a has a distance from the oil circulation path 3, an increase in the temperature of the oil is suppressed. As a result, overheating of the oil is suppressed.

  FIG. 12 is a control flow mainly for controlling the switching valve 18 incorporated in the cooling water exhaust heat recovery unit 16. First, in step S41, it is determined whether or not the cooling water temperature is lower than the temperature T2. This temperature T2 is defined as a recommended temperature of the cooling water temperature, and the same value as a value used as a criterion for determining whether or not the engine 2 has been warmed up is adopted. That is, the temperature T2 is the same value as the value in step S3 in the flowchart shown in FIG.

  When it is determined YES in step S41, that is, when it is determined that the coolant temperature is lower than the temperature T2, the process proceeds to step S42. In step S42, the switching valve 18 issues a command to flow the exhaust flow to the exhaust heat recovery side, that is, the bypass pipe 15b. Thereby, the switching valve 20 will be in the state which flows an exhaust flow to the bypass pipe 15b, as shown to Fig.9 (a). Since the bypass pipe 15b is in contact with the cooling water pipe 17, the temperature of the cooling water rises. As a result, warm-up of the engine 2 is promoted.

  On the other hand, when NO is determined in step S41, that is, when it is determined that the cooling water temperature is higher than the temperature T2, the process proceeds to step S43. In step S43, it is determined whether the engine internal oil temperature is higher than temperature T5. The temperature T5 is a value set in advance as a threshold value for avoiding overheating of the oil. The temperature T5 can be arbitrarily set to a value different from the temperature T4 within a temperature range lower than the danger value at which the oil is overheated. In this embodiment, the temperature T5 is higher than the temperatures T2 and T4. When it is determined YES in step S43, that is, when it is determined that the engine internal oil temperature is higher than the temperature T5, the process proceeds to step S44. In step S44, it is determined whether or not the cooling water temperature is lower than temperature T3. The temperature T3 is a value set in advance as a value that has a margin with respect to the overheat determination temperature of the engine 2. When YES is determined in the step S44, that is, when it is determined that the cooling water temperature is lower than the temperature T3, the process proceeds to a step S45.

In step S45, the switching valve 18 of the cooling water exhaust heat recovery unit 16 issues a command to flow the exhaust flow to the exhaust heat recovery side, that is, the bypass pipe 15b. Thereby, the switching valve 20 will be in the state which flows an exhaust flow to the bypass pipe 15b, as shown to Fig.9 (a). Since the bypass pipe 15b is in contact with the cooling water pipe 17, the temperature of the exhaust flow decreases. On the other hand, the temperature of the cooling water rises. However, since the cooling water temperature is lower than the temperature T3 as a premise for performing this control, overheating is avoided.
Further, in step S45, regardless of the normal control of the switching valve 20 whose control flow is shown in FIG. 11, the switching valve 20 of the oil exhaust heat recovery unit 19 sends the exhaust flow to the exhaust heat recovery side, that is, the bypass pipe 15c. Give a command to flow. Thereby, the switching valve 20 will be in the state which flows an exhaust flow to the bypass pipe 15c, as shown to Fig.10 (a). The bypass pipe 15 c is in contact with the oil circulation path 3. However, the temperature of the exhaust stream flowing through the bypass pipe 15c is lowered by the exhaust stream passing through the cooling water exhaust heat recovery unit 16. For this reason, an oil temperature rise can be suppressed. By performing such control, exhaust heat can be continuously applied to the oil while preventing overheating of the oil. As a result, the heat storage effect on the latent heat storage material 6 is improved.

  On the other hand, if NO is determined in step S43, that is, if it is determined that the engine internal oil temperature is lower than the temperature T5, the process proceeds to step S46. Further, when NO is determined in step S24, that is, when it is determined that the cooling water temperature is higher than the temperature T3, the process proceeds to step S26.

  In step S46, the switching valve 18 of the cooling water exhaust heat recovery unit 16 issues a command to flow the exhaust flow to the exhaust heat non-recovery side, that is, the main pipe 15a. Thereby, the switching valve 20 will be in the state which sends an exhaust flow to the main pipe 15a, as shown in FIG.9 (b). Since the main pipe 15a has a distance from the cooling water pipe 17, an increase in the temperature of the cooling water is suppressed.

  There is a NO determination in step S41 as a premise for performing the process of step S46. That is, the cooling water is sufficiently warmed. When the process of step S46 is performed by determining NO in step S43, the engine internal oil temperature is lower than the temperature T5. Therefore, there is little risk of oil overheating. For this reason, it is not necessary to lower the temperature of the exhaust flow supplied to the oil exhaust heat recovery unit 19. For the above reasons, the cooling water exhaust heat recovery unit 16 does not perform heat exchange between the exhaust flow and the cooling water.

  Moreover, when performing the process of step S46 by determining NO in step S44, the cooling water temperature is higher than the temperature T3. Therefore, if the heat of the exhaust stream is further obtained from this state, there is a risk of overheating. Therefore, the cooling water exhaust heat recovery unit 16 does not perform heat exchange between the exhaust flow and the cooling water.

  By performing the exhaust heat recovery control as described above, the engine 2 can be warmed up early, and the latent heat storage material 6 can be efficiently stored while preventing oil overheating.

  Next, a third embodiment of the present invention will be described with reference to FIG. The heat storage system 60 according to the third embodiment includes a cooling water exhaust heat recovery device 61 instead of the cooling water exhaust heat recovery device 16 according to the second embodiment. The heat storage system 60 of the third embodiment includes an oil exhaust heat recovery device 62 instead of the oil exhaust heat recovery device 19 in the second embodiment.

  Unlike the cooling water exhaust heat recovery unit 16, the cooling water exhaust heat recovery unit 61 does not have a component corresponding to the switching valve 18 inside. That is, the cooling water exhaust heat recovery device 61 is only arranged so that the exhaust pipe 15 through which the exhaust flow flows and the cooling water pipe 17 are in contact with each other.

  The oil exhaust heat recovery unit 62 performs heat exchange between the cooling water that has been heat-exchanged by the cooling water exhaust heat recovery unit 61 and the oil that circulates in the oil circulation path 3. That is, unlike the oil exhaust heat recovery unit 19, heat exchange between the exhaust stream and oil is not performed. Accordingly, unlike the oil exhaust heat recovery unit 19, there is no component corresponding to the switching valve 20 inside.

  The heat storage system 60 of the third embodiment is removed because the oil temperature sensor 21 provided in the heat storage system 1 of the second embodiment is not used for control. Since the other components are basically not different from those of the heat storage system 55 of the second embodiment, the common components are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted. .

  Further, the heat storage / warm-up control performed by the heat storage system 1 of the first embodiment is similarly performed in the heat storage system 60 of the third embodiment. Furthermore, the clogging elimination control performed by the heat storage system 1 of the first embodiment can be performed in the same manner. However, the exhaust heat recovery control performed by the heat storage system 55 of the second embodiment is not necessary. Hereinafter, this reason will be described.

  In the second embodiment, one of the reasons for performing exhaust heat recovery control is prevention of overheating of oil. In the heat storage system 60 of the third embodiment, the oil flowing through the oil circulation path 3 obtains the heat of the exhaust flow through the cooling water flowing through the cooling water pipe 17. For this reason, heat exchange at the boiling point or higher of the cooling water is avoided. As a result, overheating of the oil is prevented. For this reason, it is possible to omit monitoring the temperature of the oil heat-exchanged by the oil exhaust heat recovery device and controlling the temperature of the oil.

  For the above reason, the exhaust heat recovery control is not necessary in the heat storage system 60 of the third embodiment. Accordingly, as described above, in the heat storage system 60 of the third embodiment, the oil temperature sensor 21 provided in the heat storage system 55 of the second embodiment is removed.

  As described above, according to the heat storage system 60, heat storage and heat dissipation are efficiently performed according to the state of the engine 2 in the same manner as the heat storage system 1 of the first embodiment and the heat storage system 55 of the second embodiment. Efficient heat utilization. In addition to this, the exhaust heat recovery control is not required, and the components associated therewith can be omitted, so that the configuration can be simplified.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS. 124 and 15. The heat storage system 70 of the fourth embodiment is different from the heat storage system 55 of the second embodiment in that the bypass path 9 in the heat storage system 55 is replaced with a bypass path 71. In addition, a scavenge pump 72 is mounted at a place where the feed pump 10 is installed, and the feed pump 10 is moved downstream of the heat storage tank 4 along with this.

  Since the other components are basically not different from those of the heat storage system 55 of the second embodiment, the common components are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted. .

  Further, the heat storage / warm-up control performed by the heat storage system 1 of the first embodiment is similarly performed in the heat storage system 70 of the fourth embodiment. Furthermore, the clogging elimination control performed by the heat storage system 1 of the first embodiment and the exhaust heat recovery control performed by the heat storage system 55 of the second embodiment can be performed in the same manner.

  The heat storage system 70 of Example 4 corresponds to a dry sump type oil supply system. In the heat storage system 70, the heat storage tank 4 is used as a tank for storing oil.

  The bypass path 9 in the heat storage system 55 of the second embodiment is branched from the oil circulation path 3 by the control valve 12, and joins the oil circulation path 3 again downstream of the heat storage tank 4. In contrast, the bypass path 71 is branched by the control valve 12 and then introduced into the upper layer portion 4a1 in which the oil 5 of the heat storage tank 4 is stored. In the dry sump method, since oil-gas separation is performed, it is necessary to pass through the upper layer 4a1 in which the oil 5 is stored. FIG. 14 shows a state of the regulating valve 12 that circulates oil to the latent heat storage material 6 side. After passing through the latent heat storage material 6, the oil passes through the upper layer part 4 a 1 storing the oil 5. FIG. 15 shows a state of the control valve 12 that bypasses the latent heat storage material 6. The oil flows directly into the upper layer part 4a1. As described above, regardless of the state of the control valve 12, the oil passes through the upper layer portion 4 a 1 storing the oil 5 in the heat storage tank 4. Thereby, gas-liquid separation of oil can be performed.

  As described above, the heat storage system 70 can also correspond to the engine 2 that employs a dry sump type oil supply system, and efficiently stores and dissipates heat according to the state of the engine 2, thereby improving the efficiency in the system. Heat utilization becomes possible.

  Next, Example 5 will be described with reference to FIG.

  The heat storage system 80 according to the fifth embodiment includes a heat pipe 81 that receives heat from the exhaust flow of the engine 2 and an oil exhaust heat recovery unit 82 that applies heat to the oil circulating through the oil circulation path 3 through the heat pipe. I have. The heat pipe 81 is filled with a working fluid that blocks heat transfer in the oil overheating temperature region.

  That is, a heat pipe 81 is provided instead of the cooling water exhaust heat recovery device 16 provided in the heat storage system 55 of the second embodiment. Further, an oil exhaust heat recovery unit 82 is provided instead of the oil exhaust heat recovery unit 19.

  The heat pipe 81 removes heat from the exhaust flow when the working fluid sealed inside vaporizes. Then, when the vaporized hydraulic fluid moves to the other end side and returns to the liquid again, it dissipates heat. The radiated heat is given to the oil in the oil circulation path 3 in the oil exhaust heat recovery unit 82. Unlike the oil exhaust heat recovery unit 19, the oil exhaust heat recovery unit 82 does not have a component corresponding to the switching valve 20 inside.

  The other components are basically not different from those of the heat storage system 55 of the second embodiment. Therefore, the common components are denoted by the same reference numerals in the drawings, and detailed descriptions thereof are omitted. Omitted.

  Further, the heat storage / warm-up control performed by the heat storage system 1 of the first embodiment is similarly performed in the heat storage system 80 of the fifth embodiment. Furthermore, the clogging elimination control performed by the heat storage system 1 of the first embodiment can be performed in the same manner. However, the exhaust heat recovery control performed by the heat storage system 55 of the second embodiment is not necessary. Hereinafter, this reason will be described.

  The heat pipe 81 applies exhaust heat to the oil in the oil circulation path 3 by the mechanism as described above. Therefore, by selecting a hydraulic fluid having an appropriate evaporation temperature, a temperature region where heat transfer can be performed can be set. The heat pipe 81 is filled with a working fluid that blocks heat transfer in the oil overheating temperature range. Thereby, overheating of oil can be prevented. At this time, no special control is required.

  For the above reasons, exhaust heat recovery control is not necessary. As described above, according to the heat storage system 80, heat storage and heat dissipation are efficiently performed according to the state of the engine 2 in the same manner as the heat storage system 1 of the first embodiment and the heat storage system 55 of the second embodiment. Heat utilization becomes possible. In addition to this, the exhaust heat recovery control is not required, and the components associated therewith can be omitted, so that the configuration can be simplified.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

It is explanatory drawing which showed the schematic structure of the heat storage system incorporated in the engine typically, and made the control valve the state which flows oil to the latent heat storage material side. It is explanatory drawing which showed the schematic structure of the thermal storage system integrated in the engine typically, and made the control valve the state which flows oil to the bypass path | route side. It is a flowchart which shows an example of heat storage-warm-up control. It is a flowchart which shows an example of clogging elimination control. It is a flowchart which shows the other example of clogging elimination control. It is a flowchart which shows the other example of clogging elimination control. It is explanatory drawing which showed typically the schematic structure of the thermal storage system incorporated in the engine of Example 2, and made the adjustment valve the state which flows oil to the latent-heat storage material side. It is explanatory drawing which showed typically the schematic structure of the thermal storage system incorporated in the engine of Example 2, and made the control valve the state which flows oil to the bypass path | route side. 9A shows the internal structure of the cooling water exhaust heat recovery device, FIG. 9A is a diagram showing a state in which the exhaust flow is made to flow to the bypass pipe, and FIG. 9B is a diagram showing a state in which the exhaust flow is made to flow to the main pipe. is there. 10 shows the internal structure of the oil exhaust heat recovery unit, FIG. 10A is a diagram showing a state in which the exhaust flow is made to flow to the bypass pipe, and FIG. 10B is a diagram showing a state in which the exhaust flow is made to flow to the main pipe. . It is a flowchart which shows an example of control of the oil exhaust heat recovery device in exhaust heat recovery control. It is a flowchart which shows an example of control of the cooling water exhaust heat recovery device mainly in exhaust heat recovery control. It is explanatory drawing which showed typically schematic structure of the thermal storage system incorporated in the engine in Example 3. FIG. It is explanatory drawing which showed typically the schematic structure of the thermal storage system incorporated in the engine in Example 4, and made the adjustment valve the state which flows oil to the latent-heat storage material side. It is explanatory drawing which showed typically the schematic structure of the thermal storage system incorporated in the engine in Example 4, and made the control valve the state which flows oil to the bypass path | route side. It is explanatory drawing which showed typically schematic structure of the thermal storage system incorporated in the engine in Example 5. FIG.

Explanation of symbols

1, 55, 60, 70, 80 ... heat storage system 2 ... engine 3 ... oil circulation path 4 ... heat storage tank 5 ... oil 6 ... latent heat storage material 7 ... oil supply pipe 7a ... oil supply hole 7b ... on-off valve 8, 13, DESCRIPTION OF SYMBOLS 14, 21, 22 ... Temperature sensor 9 ... Bypass path 10 ... Feed pump 12 ... Control valve 15 ... Exhaust pipe 15a ... Main pipe 15b, 15c ... Bypass pipe 16, 61 ... Cooling water exhaust heat recovery device 17 ... Cooling water pipe 18, 20 ... Switching valve 19, 62, 82 ... Oil exhaust heat recovery device 23 ... Water pump 24 ... Discharge amount sensor 50 ... ECU 72 ... Scavenge pump

Claims (4)

A heat storage tank that is incorporated in an oil circulation path through which oil supplied for lubrication inside the engine circulates, and that stores a heat storage body that stores heat by the state change of the oil and solid and liquid;
A bypass path for bypassing the heat storage body housed inside the heat storage tank;
A feed pump for circulating oil through the oil circulation path and the bypass path;
A regulating valve that regulates the amount of oil passing through the heat storage body and the amount of oil passing through the bypass path;
A temperature measuring means for measuring the engine temperature;
Temperature measuring means for measuring the oil temperature in the heat storage tank, which is the temperature of the oil present in the heat storage tank,
When the oil temperature in the heat storage tank is higher than the engine temperature, the control valve is controlled so that the amount of oil passing through the heat storage body is larger than the amount of oil passing through the bypass path, and the heat storage tank Control means for controlling the control valve such that when the internal oil temperature is lower than the engine temperature, the amount of oil passing through the heat storage body is less than the amount of oil passing through the bypass path;
With
When the control means determines that the oil temperature in the heat storage tank is lower than the engine temperature and the engine has been warmed up, the amount of oil passing through the heat storage body passes through the bypass path. The heat storage system characterized by controlling the said control valve so that it may become more than oil quantity. A heat storage tank that is incorporated in an oil circulation path through which oil supplied for lubrication inside the engine circulates, and that stores a heat storage body that stores heat by the state change of the oil and solid and liquid;
A bypass path for bypassing the heat storage body housed inside the heat storage tank;
A feed pump for circulating oil through the oil circulation path and the bypass path;
A regulating valve that regulates the amount of oil passing through the heat storage body and the amount of oil passing through the bypass path;
A temperature measuring means for measuring the engine temperature;
Temperature measuring means for measuring the oil temperature in the heat storage tank, which is the temperature of the oil present in the heat storage tank,
When the oil temperature in the heat storage tank is higher than the engine temperature, the control valve is controlled so that the amount of oil passing through the heat storage body is larger than the amount of oil passing through the bypass path, and the heat storage tank Control means for controlling the control valve such that when the internal oil temperature is lower than the engine temperature, the amount of oil passing through the heat storage body is less than the amount of oil passing through the bypass path;
With
A cooling water exhaust heat recovery device for exchanging heat between the engine exhaust flow and the engine cooling water;
An oil exhaust heat recovery unit that performs heat exchange between the exhaust flow of the engine and the oil that circulates in the oil circulation path, and is disposed downstream of the cooling water exhaust heat recovery unit with respect to the exhaust flow When,
Cooling water exhaust heat recovery switching means for switching whether or not to perform exhaust heat recovery in the cooling water exhaust heat recovery device;
Oil exhaust heat recovery switching means for switching whether to perform exhaust heat recovery in the oil exhaust heat recovery unit;
Temperature measuring means for measuring the temperature of oil flowing through the oil circulation path;
A temperature measuring means for measuring the cooling water temperature;
With
When the temperature of the oil flowing through the oil circulation path exceeds a threshold value for avoiding overheating of the oil and the cooling water temperature has a margin with respect to the overheat determination temperature, the control means The cooling water exhaust heat recovery switching means is controlled to perform exhaust heat recovery in a recovery unit, and the oil exhaust heat recovery switching means is controlled to perform exhaust heat recovery in the oil exhaust heat recovery unit. Heat storage system. A heat storage tank that is incorporated in an oil circulation path through which oil supplied for lubrication inside the engine circulates, and that stores a heat storage body that stores heat by the state change of the oil and solid and liquid;
A bypass path for bypassing the heat storage body housed inside the heat storage tank;
A feed pump for circulating oil through the oil circulation path and the bypass path;
A regulating valve that regulates the amount of oil passing through the heat storage body and the amount of oil passing through the bypass path;
A temperature measuring means for measuring the engine temperature;
Temperature measuring means for measuring the oil temperature in the heat storage tank, which is the temperature of the oil present in the heat storage tank,
When the oil temperature in the heat storage tank is higher than the engine temperature, the control valve is controlled so that the amount of oil passing through the heat storage body is larger than the amount of oil passing through the bypass path, and the heat storage tank Control means for controlling the control valve such that when the internal oil temperature is lower than the engine temperature, the amount of oil passing through the heat storage body is less than the amount of oil passing through the bypass path;
With
A cooling water exhaust heat recovery device for exchanging heat between the engine exhaust flow and the engine cooling water;
An oil exhaust heat recovery device that performs heat exchange between the cooling water that has undergone heat exchange with the cooling water exhaust heat recovery device and the oil that circulates through the oil circulation path;
A heat storage system characterized by having The heat storage system according to any one of claims 1 to 3,
A determination means for determining whether the heat storage body is clogged in the oil circulation path;
The heat storage system according to claim 1, wherein the control means performs control to suppress circulation of cooling water circulating in the engine when the determination means determines that the heat storage body is clogged.

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