JP2010169050A - Engine system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine system achieving efficient operation. <P>SOLUTION: This system includes: a water jacket 11; and an engine cooling system 16 having a radiator 12 and cooling system water passages 13, 14; and a first water pump 17. An exhaust heat recovery device 20, and a heat accumulation system 28 communicating the exhaust heat recovery device 20 with the engine cooling system 16 and having heat accumulation system water passages 22, 23 along which a heat accumulation tank 21 is disposed, are provided. A second water pump 33 pressure-feeding to forcibly circulate cooling water in the heat accumulation system 28, and a selector valve 34, are provided. Switching between a communication state of communicating the engine cooling system 16 with the heat accumulation system 28, and a communication shutoff state shutting off the communication, is performed through an operation control of the selector valve 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an engine system having a heat recovery unit for recovering and storing heat generated by an internal combustion engine.

  Usually, an engine system mounted on a vehicle such as an automobile includes a water jacket formed inside the internal combustion engine, a radiator that is a heat exchanger, and a cooling water passage that communicates the water jacket and the radiator. An engine cooling system is provided. The engine cooling system is provided with a water pump, and cooling water filled in the engine cooling system is forcibly circulated through the operation of the water pump. In such an engine system, during forced circulation of the cooling water inside the engine cooling system, the cooling water whose temperature has decreased due to the passage of the radiator flows into the water jacket, and the temperature of the internal combustion engine decreases through heat exchange with the cooling water. Thus, the internal combustion engine is cooled.

  Conventionally, it has been proposed to provide such an engine system with a heat recovery device for recovering and storing heat generated by the internal combustion engine. As this heat recovery device, for example, in the system described in Patent Document 1, a heat storage tank for storing cooling water in the engine cooling system is provided in the engine cooling system. In this engine system, when the internal combustion engine is cold started, the cooling water stored in the heat storage tank is discharged into the engine cooling system, whereby the internal combustion engine can be warmed up early and consequently the fuel consumption can be reduced.

JP 2002-89668 A

  In recent years, demands for reducing fuel consumption have become stricter, and in order to meet these demands, a system that can efficiently store the heat generated by an internal combustion engine and the effective use of the finite heat stored Realization of a possible system is desired.

  In this regard, the engine system described in Patent Document 1 simply stores the cooling water in the engine cooling system and discharges it when starting the engine, and generates heat generated by the internal combustion engine in order to realize high-efficiency operation of the engine system. As a result, there is still room for improvement in the use of the.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an engine system capable of realizing efficient operation.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to a first aspect of the present invention, there is provided an engine cooling system having a water jacket and a radiator formed inside the internal combustion engine, a cooling water passage communicating with the water jacket and the radiator, and the engine cooling system. An exhaust system for recovering the heat of the exhaust gas of the internal combustion engine in an engine system provided with a first water pump for pumping the charged cooling water to forcibly circulate and a heat storage tank for storing the cooling water inside A heat storage system having a heat recovery device, a heat storage system water channel formed by communicating the exhaust heat recovery device and the engine cooling system and having the heat storage tank provided in the middle, and forcing cooling water in the heat storage system A second water pump that pumps to circulate, and a communication state that communicates the engine cooling system and the heat storage system with the communication; As its gist in that it comprises a switching valve for switching between connection and disconnection state of forcibly circulating cooling water to each other in the interior of the engine cooling system and the heat storage system.

  According to the above configuration, the cooling water is circulated in the heat storage system in a state where the communication between the engine cooling system and the heat storage system is interrupted, so that the cooling water in the pressure storage system is heated and recovered through heat recovery by the exhaust heat recovery device. It can be in the state of. In other words, high-temperature and high-pressure cooling water can be created as compared with the cooling water inside the engine cooling system. As a result, the generated heat of the internal combustion engine can be recovered with high efficiency and stored in the heat storage tank as compared with the configuration in which the cooling water in the engine cooling system is stored in the heat storage tank, It becomes possible to warm each part of the engine system at an early stage as compared with the configuration in which each part of the system is warmed. Thus, according to the said structure, the generated heat of an internal combustion engine can be utilized with high efficiency, and an engine system can be drive | operated efficiently.

  According to a second aspect of the present invention, in the engine system according to the first aspect, the switching valve is in the communication state for a predetermined period after the start of the internal combustion engine, and after the predetermined period has elapsed. The gist is that the communication is cut off.

  According to the above configuration, the cooling water is forcibly circulated separately inside the engine cooling system and the heat storage system by setting the communication cut-off state after the temperature of the internal combustion engine becomes high, for example, when the warm-up is completed. It can be stored in the heat storage tank after the cooling water in the heat storage system is in a high temperature and high pressure state. In addition, when the internal combustion engine is started, the engine cooling system and the heat storage system are in communication with each other, whereby the cooling water in the heat storage tank can be discharged to the engine cooling system, and the internal combustion engine can be warmed up quickly. be able to.

  According to a third aspect of the present invention, in the engine system according to the second aspect, the operation of the second water pump is stopped when the temperature of the cooling water in the heat storage system becomes higher than a predetermined temperature. The gist.

  According to the above configuration, when the temperature of the cooling water in the heat storage system becomes high, the amount of heat recovered by the exhaust heat recovery device can be suppressed to a small amount, and the temperature of the cooling water in the heat storage system is excessively increased. It is possible to suppress deterioration of the cooling water.

  According to a fourth aspect of the present invention, in the engine system according to the second or third aspect, when the pressure of the cooling water in the heat storage system is higher than a predetermined pressure when switching from the communication cut-off state to the communication state, The gist of the present invention is that it further comprises forcible lowering means for forcibly lowering the pressure of the cooling water in the heat storage system prior to the switching.

  According to the above configuration, it is possible to avoid an excessive increase in the pressure of the cooling water in the engine cooling system due to the communication between the engine cooling system and the heat storage system, thereby reducing the reliability of the engine cooling system. Can be suppressed.

The gist of the fifth aspect of the present invention is the engine system according to the fourth aspect, wherein the forcible lowering means operates the second water pump.
According to the said structure, the temperature of the cooling water in a thermal storage system can be reduced through heat exchange with the external air via the wall part of a thermal storage system water channel, and, thereby, the pressure of the cooling water can be reduced.

  A sixth aspect of the present invention is the engine system according to the first aspect, wherein the heat storage system is connected to a heater core of a heater unit, and the engine system is configured to perform the heating by the heater unit when the engine cooling system is used. The gist of the invention is that when the temperature of the cooling water inside is lower than a predetermined temperature, the communication is cut off and heating is performed using the heater core.

  According to the above configuration, even when the temperature of the cooling water in the engine cooling system is low, the heater provided in the same heat storage system as the cooling water in the heat storage system heated through heat recovery by the exhaust heat recovery device Heating can be performed using a heater core that is a heat exchanger of the unit. In addition, since the cooling water in the engine cooling system is not used for heating at this time, the temperature of the cooling water can be raised early so that the internal combustion engine can be warmed up early.

  The invention according to claim 7 is the engine system according to claim 6, wherein the engine system is configured such that the temperature of the cooling water in the engine cooling system is equal to or higher than the predetermined temperature when the heater unit performs heating. Furthermore, the gist of the invention is that the communication state is set and heating is performed using the heater core.

  According to the above configuration, when the temperature of the cooling water in the engine cooling system is high, the amount of heat recovered by the exhaust heat recovery device and the amount of heat recovered from the internal combustion engine are added as the amount of heat available for heating using the heater core. A sufficient amount can be secured.

  The invention according to claim 8 is the engine system according to claim 6, wherein the heater unit has a heater core provided in the engine cooling system, and the engine system performs heating by the heater unit. In this case, when the temperature of the cooling water in the engine cooling system is equal to or higher than the predetermined temperature, the communication cutoff state is set and heating is performed using a heater core provided in the engine cooling system.

According to the above configuration, when the temperature of the internal combustion engine is high, heating can be performed using the same heat while recovering a sufficient amount of heat from the internal combustion engine through the engine cooling system.
The invention according to claim 9 is the engine system according to claim 6, wherein the engine system is in the communication cut-off state when the heater unit performs heating, and the temperature of the cooling water in the engine cooling system. When the temperature is lower than the predetermined temperature, the heater core is connected only to the heat storage system, and when the temperature of the cooling water in the engine cooling system is equal to or higher than the predetermined temperature, the heater core is connected only to the engine cooling system. This is the gist.

  According to the above configuration, when the temperature of the internal combustion engine is low using one heater core, the cooling water in the heat storage system heated through the heat recovery by the exhaust heat recovery device is used for heating, and the internal combustion engine When the temperature is high, a sufficient amount of heat is recovered from the internal combustion engine through the engine cooling system, and heating can be performed using the same heat.

  The invention according to claim 10 is the engine system according to any one of claims 6 to 9, wherein the heater unit includes a blower that blows air to a heater core connected to the heat storage system, When the temperature of the cooling water in the engine cooling system is lower than the predetermined temperature when performing the heating by the heater unit, the engine system is compared with the case where the temperature of the cooling water is equal to or higher than the predetermined temperature. The gist of the invention is to set the blower volume of the blower to a small amount.

  When the temperature of the cooling water in the engine cooling system is low when performing heating by the heater unit, the communication is cut off so that the temperature is raised by the exhaust heat recovery device as compared with the case of the communication state. Since the heat capacity of the path through which the water circulates decreases and the temperature of the cooling water rises early, high-temperature hot air can be generated early.

  However, since the heat capacity of the above path is small, if the amount of air blown from the blower is increased and a large amount of heat is used for heating by the heater core, the temperature of the cooling water in the heat storage system may be lowered. May not be able to generate hot air.

  In this regard, according to the above-described configuration, the amount of air blown from the blower can be suppressed to a small amount when it is in such a communication cut-off state compared to when it is in the above-described communication state. Can be generated.

  The invention according to claim 11 is the engine system according to any one of claims 6 to 10, wherein the heat storage tank is provided with a heat storage material whose temperature changes through heat exchange with cooling water. The heat storage system further includes a bypass water channel that bypasses the heat storage tank, and a bypass valve that changes a ratio of the cooling water flow rate of the bypass water channel and the cooling water flow rate of the heat storage tank, and the engine system includes: When heating using the heater core connected to the heat storage system, when the temperature of the cooling water in the heat storage system is lower than a predetermined temperature, the cooling water passes only through the bypass channel without passing through the heat storage tank. The gist of the invention is to control the operation of the bypass valve so as to circulate.

  According to the above configuration, since the cooling water does not pass through the heat storage tank when the temperature of the cooling water in the heat storage system is low, it is possible to suppress the heat of the cooling water from being absorbed by the heat storage material. Therefore, compared to a configuration in which the cooling water passes through the heat storage tank when the temperature of the cooling water in the heat storage system is low, the heat recovered by the exhaust heat recovery device is efficiently used for heating using the heater core. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows schematic structure of the engine system concerning 1st Embodiment which actualized this invention. 1 is a schematic diagram schematically showing the internal structure of a heat storage tank. The flowchart which shows the execution procedure of the operation control concerning 1st Embodiment. A table showing details of each operation mode. The schematic diagram which shows the distribution | circulation aspect of the cooling water in heat dissipation mode. The schematic diagram which shows the distribution | circulation aspect of the cooling water in temperature rising mode. The schematic diagram which shows the distribution | circulation aspect of the cooling water in thermal storage mode. The schematic diagram which shows the distribution | circulation aspect of the cooling water in overheat mode. The schematic diagram showing the schematic structure of the engine system concerning a 2nd embodiment which materialized the present invention. The flowchart which shows the execution procedure of the operation control concerning 2nd Embodiment. The flowchart which shows the execution procedure of the same operation control. The schematic diagram which shows an example of the circulation mode of the cooling water in 2nd Embodiment. The schematic diagram which shows an example of the distribution | circulation aspect of the cooling water in 2nd Embodiment. The schematic diagram which shows an example of the circulation mode of the cooling water in 2nd Embodiment. The schematic diagram which shows an example of the circulation mode of the cooling water in 2nd Embodiment. The flowchart which shows the modification of the thermal radiation mode of 1st Embodiment. The flowchart which shows the modification of the operation control concerning 2nd Embodiment. The schematic diagram which shows schematic structure of the heater core periphery about the modification of the engine system concerning 2nd Embodiment.

(First embodiment)
A first embodiment embodying an engine system according to the present invention will be described below.
As shown in FIG. 1, the engine system according to the present embodiment includes an engine cooling system 16 including a water jacket 11, a radiator 12, a cooling system water channel 13, a cooling system water channel 14, a bypass water channel 15, and the like. . The water jacket 11 is formed inside the internal combustion engine 10. The radiator 12 is a heat exchanger for cooling the cooling water passing through the radiator 12 through heat exchange with the outside air. The cooling system water channel 13 is a channel for guiding the cooling water flowing out from the water jacket 11 to the radiator 12, and the cooling system channel 14 is a channel for returning the cooling water after passing through the radiator 12 to the water jacket 11, The bypass water channel 15 is a passage that connects the cooling system water channels 13 and 14 so as to bypass the radiator 12.

  The engine cooling system 16 is provided with a first water pump 17. The first water pump 17 is drivingly connected to an output shaft (not shown) of the internal combustion engine 10. Then, when the first water pump 17 is driven during the operation of the internal combustion engine 10, the cooling water filled in the engine cooling system 16 is forcibly circulated in the engine cooling system 16. .

  The engine cooling system 16 is provided with a thermostat valve 19. The thermostat valve 19 changes its opening degree according to the temperature of the cooling water that abuts. Then, the passage cross-sectional areas of the cooling system water channel 14 and the bypass water channel 15 are changed by changing the opening of the thermostat valve 19, thereby adjusting the amount of cooling water flowing into the radiator 12.

  On the other hand, the engine system according to the present embodiment includes a heat storage system including an exhaust heat recovery device 20, a heat storage tank 21, heat storage water channels 22, 23, a bypass water channel 24, a bypass valve 25, a bypass passage 26, and a bypass valve 27. 28.

  The exhaust heat recovery device 20 is attached to the exhaust passage 29 of the internal combustion engine 10 and has a structure through which the exhaust of the internal combustion engine 10 and cooling water pass. The exhaust heat recovery unit 20 is for recovering the heat of the exhaust gas of the internal combustion engine 10 through heat exchange between the exhaust gas and the cooling water inside.

  The heat storage tank 21 is for storing cooling water inside. Inside the heat storage tank 21, a heat storage material for storing heat of the cooling water through heat exchange with the cooling water is provided. By providing this heat storage material, the heat of the cooling water can be efficiently stored in the heat storage tank 21 as compared with a system that simply employs a heat storage tank that stores the cooling water.

FIG. 2 schematically shows the internal structure of the heat storage tank 21.
As shown in FIG. 2, the inside of the heat storage tank 21 is partitioned in a lattice shape, and the cooling water passes through each partitioned water channel 21b extending in the partitioned square shape. A plurality of heat storage materials 21a are packed in each partitioned water channel 21b so as to line up in a row. The heat storage material 21a is obtained by filling a heat storage agent (for example, erythritol) inside a capsule formed in an outer spherical shape.

  By adopting the heat storage tank 21 having such a structure, for example, the contact area between the heat storage material 21a and the cooling water is increased as compared with a system in which a heat storage tank in which a tube-shaped or sheet-shaped heat storage material is provided. Thus, the heat of the cooling water can be efficiently stored in the heat storage material 21a. Incidentally, a gas chamber (not shown) having a structure in which gas is injected and the gas does not flow outside is formed inside the heat storage tank 21, and this gas chamber is a pressure inside the heat storage system 28 (FIG. 1). It is designed to function as an accumulator.

  The heat storage system water channel 22 is a passage for sending the cooling water in the heat storage system 28 to the exhaust heat recovery device 20, and the heat storage system water channel 23 returns the cooling water after passing through the exhaust heat recovery device 20 into the heat storage system 28. It is a passage for. The heat storage tank 21 is provided in the middle of the heat storage system water channel 23.

  The bypass water channel 24 and the bypass valve 25 are provided in the heat storage system water channel 23. The bypass water channel 24 is a passage connecting the upstream side and the downstream side of the heat storage tank 21 in the heat storage system water channel 23, and the cooling water flows so as to bypass the heat storage tank 21 via the bypass water channel 24. A heater core 31 that is a heat exchanger of the heater unit 30 is provided in the middle of the bypass water channel 24, and a blower 32 that blows air to the heater core 31 is provided in the vicinity of the heater core 31 to generate hot air. It has been. The bypass valve 25 is a control valve for changing the ratio of the cooling water flow rate of the bypass water channel 24 and the cooling water flow rate of the heat storage tank 21.

  The bypass passage 26 is a passage that communicates with each heat storage system water passage 22, 23, and the cooling water flows through the bypass passage 26 so as to bypass the exhaust heat recovery device 20. Further, the bypass valve 27 is provided in a communication portion between the heat storage system water channel 23 and the bypass water channel 24, so that the cooling water circulates only through the bypass passage 26 and the cooling water does not pass through the bypass passage 26. Is a control valve for switching between the state in which the circulates.

  A second water pump 33 is provided in the heat storage system water channel 22 of the heat storage system 28. By operating the second water pump 33, the cooling water in the heat storage system water channel 22 is pumped toward the exhaust heat recovery device 20. As the second water pump 33, an electric pump is employed.

  The engine system according to the present embodiment has a structure capable of switching between a state (communication state) in which the engine cooling system 16 and the heat storage system 28 are communicated and a state (communication interruption state) in which the communication is blocked. Yes. Specifically, a switching valve 34 that can switch between a communication state and a communication cut-off state is provided. The heat storage system water channels 22 and 23 of the heat storage system 28 are individually connected to the switching valve 34. The switching valve 34 communicates with a first water passage 35 branched from a portion downstream of the thermostat valve 19 in the cooling water passage 13 of the engine cooling system 16 and a second water passage 36 branched from the water jacket 11. Has been. A heater core 37 that is a heat exchanger of the heater unit 30 is provided in the middle of the first water channel 35, and a blower 38 that blows air to the heater core 37 is provided in the vicinity of the heater core 37 to generate hot air. It has been. The first water passage 35 and the second water passage 36 constitute a part of the engine cooling system 16.

  When the communication state is selected, the operation of the switching valve 34 is controlled so that the first water channel 35 and the heat storage system water channel 22 communicate with each other and the second water channel 36 and the heat storage system water channel 23 communicate with each other. Is done. At this time, through the operation of the second water pump 33, the cooling water flows through a path “first water channel 35 → heat storage system water channel 22 → exhaust heat recovery device 20 → heat storage system water channel 23 → second water channel 36”. That is, the cooling water in the engine cooling system 16 is once introduced into the heat storage system 28 and then returned to the engine cooling system 16.

  On the other hand, when the communication cutoff state is selected, the operation of the switching valve 34 is performed so that the first water channel 35 and the second water channel 36 are communicated and the heat storage system water channel 22 and the heat storage system water channel 23 are communicated. It is controlled (state shown in FIG. 1). At this time, in the engine cooling system 16, a part of the cooling water is forced through a path of “water jacket 11 → second water path 36 → first water path 35 → cooling system water path 14 → water jacket 11” through the operation of the first water pump 17. Circulated. In the heat storage system 28, the cooling water is forcibly circulated through the operation of the second water pump 33 through a path “heat storage system water channel 22 → exhaust heat recovery device 20 → heat storage system water channel 23 → heat storage system water channel 22”. That is, the cooling water is forcibly circulated separately inside the engine cooling system 16 and the heat storage system 28.

  The engine system according to the present embodiment is provided with various sensors for detecting the operating state. As such a sensor, for example, a temperature sensor for detecting the temperature of the cooling water (cooling system water temperature THWL) in the engine cooling system 16 (specifically, the water jacket 11), the heat storage system 28 (specifically, A temperature sensor is provided for detecting the temperature of the cooling water (heat storage system water temperature THWH) in the heat storage system water channel 23). In addition, a pressure sensor for detecting the pressure of the cooling water in the heat storage system 28 (heat storage system pressure PH) and a temperature sensor for detecting the temperature of the cooling water in the heat storage tank 21 (tank water temperature THWT) are also provided. It has been.

  The engine system according to the present embodiment includes an electronic control unit 39 configured to include, for example, a microcomputer. The electronic control unit 39 captures output signals of various sensors and executes various arithmetic processes based on the output signals, and the bypass valve 25, the bypass valve 27, the second water pump 33, Various controls related to the operation of the engine system, such as operation control of the switching valve 34 and the fans 32 and 38, are executed.

According to the engine system according to the present embodiment, it is possible to improve the efficiency of operation of the engine system as follows.
That is, the communication between the engine cooling system 16 and the heat storage system 28 is cut off through the operation control of the switching valve 34 and the cooling water is circulated inside the heat storage system 28 through the operation control of the second water pump 33. Accordingly, the cooling water in the heat storage system 28 can be brought into a high-temperature and high-pressure state through heat recovery by the exhaust heat recovery device 20. In other words, compared with the cooling water inside the engine cooling system 16, high-temperature and high-pressure cooling water can be created inside the heat storage system 28.

  Thereby, compared with the structure which stocks the cooling water in the engine cooling system 16 in the heat storage tank, the generated heat of the internal combustion engine 10 is recovered with high efficiency and stored in the heat storage tank 21, or the engine cooling system 16 Compared with the configuration in which each part of the engine system is warmed by the cooling water, each part of the engine system can be warmed earlier. As described above, according to the engine system according to the present embodiment, the generated heat of the internal combustion engine 10 can be used with high efficiency.

  Specifically, in the present embodiment, the operation control of the switching valve 34 is in the communication state during a predetermined period after the internal combustion engine 10 is started, and after the predetermined period has elapsed, the communication cut-off state. To be executed.

  Thereby, after the temperature of the internal combustion engine 10 becomes high, for example, when the warm-up is completed, the communication between the engine cooling system 16 and the heat storage system 28 is cut off, and the engine cooling system 16 and Within the heat storage system 28, the cooling water is forcedly circulated separately. Therefore, after the cooling water in the heat storage system 28 is in a high temperature and high pressure state, the heat of the cooling water can be stored in the heat storage tank 21.

  In addition, when the internal combustion engine 10 is started, the engine cooling system 16 and the heat storage system 28 are in communication with each other, and the heat stored in the heat storage tank 21 is released to the engine cooling system 16. For this reason, the temperature of the cooling water in the engine cooling system 16 rises early, and the internal combustion engine 10 can be warmed up early.

Hereinafter, the operation control of the engine system including the operation control of the switching valve 34 will be described in detail with reference to the flowchart shown in FIG.
The series of processes shown in this flowchart conceptually shows the specific execution procedure of the process related to the operation control, and the actual process is executed by the electronic control unit 39 as an interrupt process every predetermined cycle. Is done.

  As shown in FIG. 3, in this process, first, on the condition that the start of the internal combustion engine 10 is completed (step S101: YES), the heat dissipation mode is selected as the operation mode of the engine system (step S102).

  In this heat dissipation mode, as shown in FIG. 4, the operation of the switching valve 34 is controlled so as to be in the communication state, and the bypass is performed so that the cooling water passes through the bypass passage 26 without passing through the exhaust heat recovery device 20. The operation of the valve 27 is controlled, the operation of the bypass valve 25 is controlled so that the cooling water passes through the heat storage tank 21, and the second water pump 33 is operated.

  In the heat dissipation mode, as shown in FIG. 5, the cooling water is “cooling system water channel 14 → first water channel 35 → heat storage system water channel 22 → bypass channel 26 → heat storage system water channel 23 (heat storage tank 21) → second water channel 36 → water. In the order of “jacket 11”, the refrigerant flows from the engine cooling system 16 to the heat storage system 28, passes through the heat storage system 28, and then returns to the engine cooling system 16.

  As a result, the cooling water passing through the heat storage tank 21 is warmed through heat exchange with the heat storage material 21a (see FIG. 2), and the warmed cooling water flows into the engine cooling system 16. As the heat stored in the heat storage tank 21 is released to the engine cooling system 16 in this way, the temperature of the cooling water in the engine cooling system 16 rises early, and the internal combustion engine 10 is warmed up early. The machine comes to be planned.

  The reason why the cooling water is not allowed to pass through the exhaust heat recovery unit 20 in the heat release mode is that the exhaust temperature may be low immediately after the start of the internal combustion engine 10. In such a case, the inside of the exhaust heat recovery unit 20 This is because if the cooling water is allowed to pass through, the temperature of the cooling water may be lowered through heat exchange between the low-temperature exhaust gas and the cooling water.

  When the operation of the engine system in such a heat radiation mode is continued and the cooling system water temperature THWL becomes equal to or higher than the heat storage system water temperature THWH (step S103 in FIG. 3: YES), the heat stored in the heat storage tank 21 is released to the engine cooling system 16. The operation mode of the engine system is switched to the temperature raising mode (step S104).

  In this temperature raising mode, as shown in FIG. 4, the operation of the switching valve 34 is controlled so as to enter the communication cut-off state, and the operation of the bypass valve 27 is controlled so that the cooling water passes through the exhaust heat recovery device 20. Then, the operation of the bypass valve 25 is controlled so that the cooling water passes only the bypass water passage 24 without passing through the heat storage tank 21, and the second water pump 33 is operated.

  In the temperature raising mode, as shown in FIG. 6, in the engine cooling system 16, the cooling water is first in the order of “water jacket 11 → second water channel 36 → first water channel 35 → cooling system water channel 14 → water jacket 11”. The water pump 17 is forcedly circulated through the operation of the water pump 17 without flowing into the heat storage system 28. On the other hand, in the heat storage system 28, the cooling water is forcedly circulated through the operation of the second water pump 33 in the order of “heat storage system water channel 22 → exhaust heat recovery device 20 → heat storage system water channel 23 (bypass water channel 24) → heat storage system water channel 22”. Is done.

  Thus, in the temperature raising mode, the communication between the engine cooling system 16 and the heat storage system 28 is blocked. At this time, since a certain amount of time has passed after the start of the internal combustion engine 10, it is highly possible that the temperature of the exhaust gas is high, and cooling of the heat storage system 28 is performed by the operation of the engine system in the heat dissipation mode. Assuming that the temperature of the water is likely to be low, heat recovery by the exhaust heat recovery device 20 is started, and the temperature of the cooling water is increased.

  When the operation of the engine system in such a temperature increase mode is continued and the heat storage system water temperature THWH becomes higher than the tank water temperature THWT (step S105 in FIG. 3: YES), it is assumed that heat storage in the heat storage tank 21 is possible. The heat storage mode is selected as the system operation mode (step S106).

  In this heat storage mode, as shown in FIG. 4, the operation of the switching valve 34 is controlled so as to be in the communication cut-off state, and the operation of the bypass valve 27 is controlled so that the cooling water passes through the exhaust heat recovery device 20. The operation of the bypass valve 25 is controlled so that the cooling water passes through the heat storage tank 21, and the second water pump 33 is operated.

  In the heat storage mode, as shown in FIG. 7, the communication between the engine cooling system 16 and the heat storage system 28 is cut off, and in the heat storage system 28, “the heat storage system water channel 22 → the exhaust heat recovery device 20 → the heat storage system”. The cooling water is forcibly circulated in the order of water path 23 (heat storage tank 21) → heat storage system water path 22 ”. As a result, heat is stored in the heat storage tank 21 while increasing the temperature of the cooling water through heat recovery by the exhaust heat recovery device 20.

  When the operation of the engine system in such a heat storage mode is continued and the tank water temperature THWT becomes higher than a predetermined temperature (step S107 in FIG. 3: YES), it is assumed that the temperature of the cooling water in the heat storage system 28 has become sufficiently high. The overheat mode is selected as the system operation mode (step S108). As the predetermined temperature, the highest possible temperature (for example, 150 degrees) within the temperature range in which deterioration due to the temperature rise of the cooling water that becomes high temperature and high pressure in the heat storage system 28 can be accurately suppressed is the result of experiment or simulation, etc. Obtained in advance and stored in the electronic control unit 39.

  In this overheat mode, as shown in FIG. 4, the operation of the switching valve 34 is controlled so as to enter the communication cut-off state, so that the cooling water passes only through the bypass passage 26 without passing through the exhaust heat recovery device 20. The operation of the bypass valve 27 is controlled, the operation of the bypass valve 25 is controlled so that the cooling water passes only the bypass water passage 24 without passing through the heat storage tank 21, and the operation of the second water pump 33 is stopped. .

  In the operation of the engine system in such an overheat mode, as shown in FIG. 8, the water flow to the exhaust heat recovery device 20 and the water flow to the heat storage tank 21 are both stopped, and the cooling water circulation in the heat storage system 28 is performed. Is stopped. Therefore, when the temperature of the cooling water in the heat storage system 28 becomes high, the amount of heat recovered by the exhaust heat recovery device 20 can be suppressed to a small amount, and the temperature of the cooling water in the heat storage system 28 can be reduced. Excessive rise is suppressed and deterioration of the cooling water is suppressed.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) The heat storage system 28 having the exhaust heat recovery device 20, the heat storage tank 21, and the heat storage system water channels 22, 23, the second water pump 33, and the switching valve 34 are provided. Therefore, compared with the configuration in which the cooling water in the engine cooling system 16 is stored in the heat storage tank, the generated heat of the internal combustion engine 10 is recovered with high efficiency and stored in the heat storage tank 21, or the cooling in the engine cooling system 16 is performed. Compared with the configuration in which each part of the engine system is heated by water, each part of the engine system can be warmed earlier. Therefore, the heat generated by the internal combustion engine 10 can be used with high efficiency, and the engine system can be operated efficiently.

  (2) The operation control of the switching valve 34 is executed so as to be in the communication state during a predetermined period after the internal combustion engine 10 is started, and so as to be in the communication cut-off state after the predetermined period has elapsed. . Therefore, by setting the communication cut-off state after the temperature of the internal combustion engine 10 becomes high, it is possible to forcibly circulate cooling water inside the engine cooling system 16 and the heat storage system 28, and to cool the heat storage system 28. The heat of the cooling water can be stored in the heat storage tank 21 after the water is brought to a high temperature and high pressure state. In addition, when the internal combustion engine 10 is started, the above communication state is established, so that the heat stored in the heat storage tank 21 can be released to the engine cooling system 16 and the internal combustion engine 10 can be warmed up quickly. Become.

  (3) The operation of the second water pump 33 is stopped when the tank water temperature THWT becomes equal to or higher than a predetermined temperature. Therefore, when the temperature of the cooling water in the heat storage system 28 becomes high, the amount of heat recovered by the exhaust heat recovery device 20 can be suppressed to a small amount, and the temperature of the cooling water in the heat storage system 28 is excessively increased. It is possible to suppress the deterioration of the cooling water.

(Second Embodiment)
Hereinafter, a second embodiment that embodies the engine system according to the present invention will be described focusing on differences from the first embodiment.

  The structure of the engine system according to the present embodiment is different from the structure of the engine system according to the first embodiment in the following points. That is, as shown in FIG. 9, the first water passage 35 is not provided with a heater core, and a blower corresponding to the heater core is not provided. In addition, an outside air temperature sensor for detecting the temperature of the outside air (outside air temperature THA) is provided, and a target temperature for a vehicle interior temperature that is adjusted through switching between execution and stop of heating by the heater unit 30 and the heating. A setting switch is provided for performing the setting.

  The engine system according to the present embodiment differs from the engine system according to the first embodiment in the execution contents of the operation control. The operation control of the first embodiment is a control for early warm-up of the internal combustion engine 10 when the internal combustion engine 10 is started, whereas the operation control of the present embodiment is an engine cooling system 16. This is control for starting heating by the heater unit 30 at an early stage even when the temperature of the cooling water inside is low.

  In the operation control of the present embodiment, specifically, when the temperature of the cooling water in the engine cooling system 16 (cooling system water temperature THWL) is lower than a predetermined temperature T1 when the heater unit 30 performs the heating, the communication cut-off is performed. The operation of the switching valve 34 is controlled so as to be in a state, and heating is performed using the heater core 31 provided in the bypass water channel 24. Thereby, even when the temperature of the cooling water in the engine cooling system 16 is low, the cooling water in the heat storage system 28 that has been heated through heat recovery by the exhaust heat recovery device 20 is provided in the heat storage system 28. Heating can be performed using the heater core 31. In addition, since the cooling water in the engine cooling system 16 is not used for heating at this time, the temperature of the cooling water is increased earlier than the system in which the cooling water in the engine cooling system 16 is used for heating. Thus, the internal combustion engine 10 can be warmed up early.

  On the other hand, when the cooling water temperature THWL is equal to or higher than the predetermined temperature T1 when performing the heating by the heater unit 30, the operation of the switching valve 34 is controlled so as to be in the communication state, and the heater core 31 provided in the bypass water passage 24 is controlled. Heating is performed using As a result, when the temperature of the cooling water in the engine cooling system 16 is high, the amount of heat recovered through the exhaust heat recovery unit 20 of the heat storage system 28 as the amount of heat that can be used for heating using the heater core 31 and the internal combustion by the engine cooling system 16. A sufficient amount obtained by adding the amount of heat recovered from the engine 10 can be secured.

Hereinafter, the operation control according to the present embodiment will be described in detail with reference to the flowcharts shown in FIGS. 10 and 11.
The series of processing shown in these flowcharts conceptually shows a specific execution procedure of the processing related to the operation control, and the actual processing is executed by the electronic control unit 39 as interruption processing at predetermined intervals. Is done.

  As shown in FIG. 10, in this process, first, it is determined whether or not execution of heating by the heater unit 30 is requested (step S201). Here, it is determined that the execution of heating is requested when the setting switch is operated to perform heating.

And when execution of heating is not requested | required (step S201: NO), this process is once complete | finished, without performing the following processes.
On the other hand, when execution of heating is requested (step S201: YES), it is determined whether or not the cooling system water temperature THWL is lower than a predetermined temperature T1 (step S202). As the predetermined temperature T1, a temperature at which heating using the cooling water in the engine cooling system 16 can be performed (for example, 55 ° C.) is obtained in advance from the results of experiments and simulations and stored in the electronic control unit 39. ing.

  When the cooling system water temperature THWL is lower than the predetermined temperature T1 (step S202: YES), the temperature of the cooling water in the engine cooling system 16 is low at this time, and it is difficult to execute heating using the cooling water. The following processes (steps S203 to S210) are executed to execute heating using the cooling water in the heat storage system 28.

  That is, first, the operation of the switching valve 34 is controlled so that the communication between the engine cooling system 16 and the heat storage system 28 is blocked (the communication cut-off state) (step S203), and the cooling water in the heat storage tank 21 is controlled. It is determined whether the temperature (water temperature THWT in the tank) is higher than a predetermined temperature T2 (step S204). The predetermined temperature T2 is a temperature at which it is possible to appropriately determine that the temperature of the cooling water in the heat storage system 28 can be increased through the release of heat stored in the heat storage tank 21 (for example, 40 ° C.), which is obtained in advance from the results of experiments and simulations and stored in the electronic control unit 39.

  Then, when the tank water temperature THWT is higher than the predetermined temperature T2 (step S204: YES), it is assumed that the above situation is present, and the water is passed through the heat storage tank 21 over a predetermined period (for example, several minutes). The operation of the bypass valve 25 is controlled (step S205). At this time, as shown in FIG. 12, in the state where the communication between the engine cooling system 16 and the heat storage system 28 is cut off, in the heat storage system 28, “the heat storage system water passage 22 → the bypass passage 26 → the heat storage system water passage 23 (the heat storage tank 21 The cooling water is forcibly circulated through the operation of the second water pump 33 in the order of “) → heat storage system water channel 22”. Thereby, the heat stored in the heat storage tank 21 is released through the water flow to the heat storage tank 21, and the temperature of the cooling water in the heat storage system 28 is increased.

  Thereafter, the operation of the bypass valve 25 is controlled so that the cooling water passes only the bypass water passage 24 without passing through the heat storage tank 21 (step S206 in FIG. 10), and the cooling water passes through the exhaust heat recovery device 20. Thus, the operation of the bypass valve 27 is controlled (step S207). At this time, as shown in FIG. 13, in the heat storage system 28, the cooling water is forcibly circulated in the order of “heat storage system water channel 22 → exhaust heat recovery unit 20 → heat storage system water channel 23 (bypass water channel 24) → heat storage system water channel 22”. As a result, after the heat storage system water temperature THWH rises due to heat release from the heat storage tank 21, the cooling water circulates around the heat storage tank 21 and heat storage in the heat storage tank 21 is suppressed. In addition, the cooling water is circulated so as to pass through the exhaust heat recovery unit 20, and heat recovery by the exhaust heat recovery unit 20 is executed.

  On the other hand, when the tank water temperature THWT is lower than the predetermined temperature T2 (step S204 in FIG. 10: NO), it is determined that the above situation is not occurring, and the process proceeds to step S205 without jumping to the heat storage tank 21. The operation of the bypass valve 25 is controlled so as to pass only the bypass water passage 24 (step S206), and the operation of the bypass valve 27 is controlled so that the cooling water passes through the exhaust heat recovery device 20 (step S206). S207). In this case, heat recovery by the exhaust heat recovery device 20 is performed while suppressing the heat storage in the heat storage tank 21 without increasing the temperature of the cooling water through the heat release of the heat storage tank 21.

  Thereafter, it is determined whether or not the temperature of the cooling water in the heat storage system 28 (heat storage system water temperature THWH) has reached a temperature suitable for heating (step S208). Here, based on the target temperature, the outside air temperature THA, and the heat storage system water temperature THWH set by the setting switch, heating is performed by the heat of the cooling water in the heat storage system 28 without causing a decrease in the heat storage system water temperature THWH. It is determined whether or not it has become possible.

  When the heat storage system water temperature THWH has not reached a temperature suitable for heating (step S208: NO), heat recovery by the exhaust heat recovery device 20 is continued to increase the heat storage system water temperature THWH.

  When the heat storage system water temperature THWH reaches a temperature suitable for heating (step S208: YES), driving of the blower 32 is started, and heating by the heater core 31 provided in the bypass water channel 24 of the heat storage system 28 is started. (Step S209).

  Here, in the system according to the present embodiment, the exhaust heat recovery device is compared with the communication state by setting the communication cut-off state when the cooling system water temperature THWL is low when the heating by the heater unit 30 is performed. The heat capacity of the path through which the cooling water heated by 20 circulates decreases, and the temperature of the cooling water rises early. Therefore, the heater unit 30 can generate high-temperature hot air at an early stage. However, since the heat capacity of the path (specifically, the heat storage system 28) is small, if the amount of air blown by the blower 32 is increased and a large amount of heat is used for heating by the heater core 31, the heat storage system water temperature THWH A temperature drop will be caused and hot air cannot be generated.

  In this regard, in the present embodiment, when the cooling system water temperature THWL is lower than the predetermined temperature T1 when performing heating, that is, when heating using only the cooling water in the heat storage system 28 is performed, the cooling system water temperature THWL is Compared to when the temperature is equal to or higher than the predetermined temperature T1, the air volume of the blower 32 is suppressed to a small amount. Therefore, at the time of performing heating using only the cooling water in the heat storage system 28, the amount of hot air is reduced, but high temperature hot air can be generated early and continuously over a long period of time. .

  At this time, the operation of the bypass valve 25 is controlled so that the cooling water in the heat storage system 28 circulates only through the bypass water channel 24 without passing through the heat storage tank 21. Therefore, although the temperature of the cooling water in the heat storage system 28 is low at this time, the cooling water does not pass through the heat storage tank 21, so that the heat of the cooling water is absorbed by the heat storage material 21 a in the heat storage tank 21. Can be suppressed. Thereby, when the temperature of the cooling water in the heat storage system is low, the heat recovered by the exhaust heat recovery device 20 is more efficient for heating using the heater core 31 than in a system in which the cooling water passes through the heat storage tank. You can use it well.

After the execution of heating is started in this way, it is determined whether or not the cooling system water temperature THWL is equal to or higher than the predetermined temperature T1 (step S210).
When the cooling system water temperature THWL is lower than the predetermined temperature T1 (step S210: NO), it is determined that the heating using the cooling water in the engine cooling system 16 cannot be performed yet. Execution of heating using the cooling water is continued (step S209).

  When the cooling system water temperature THWL becomes equal to or higher than the predetermined temperature T1 (step S210: YES or step S202: NO), it is assumed that heating using the cooling water in the engine cooling system 16 can be performed at this time. (Steps S211 to S213 in FIG. 11) are executed.

  That is, first, the operation of the switching valve 34 is controlled so that the engine cooling system 16 and the heat storage system 28 are in communication (the communication state), and the blower 32 is driven to perform heating by the heater core 31. (Step S211). At this time, as shown in FIG. 14, the cooling water is “cooling system water channel 14 → first water channel 35 → heat storage system water channel 22 → exhaust heat recovery device 20 → heat storage system water channel 23 (bypass water channel 24) → second water channel 36 → water. In the order of “jacket 11”, the refrigerant flows from the engine cooling system 16 to the heat storage system 28, passes through the heat storage system 28, and then returns to the engine cooling system 16. In this case, heating by the heater core 31 is performed using a sufficient amount of heat by the amount of heat received from the internal combustion engine 10 by the engine cooling system 16 and the amount of heat recovered by the exhaust heat recovery unit 20. At this time, the amount of air blown by the blower 32 is not limited, and heating with a sufficient amount of air is performed.

  After that, it is determined whether or not the heat storage system water temperature THWH does not cause an unnecessary decrease due to the heat stored in the heat storage material 21a even when water is passed through the heat storage tank 21 (step S212 in FIG. 11). ). This determination is based on the amount of heat recovered by the exhaust heat recovery device 20, the amount of heat received from the internal combustion engine 10 by the engine cooling system 16, the amount of heat consumed by the execution of heating, and the heat storage tank 21 when it is assumed that water has passed through the heat storage tank 21. It can be performed by calculating the heat balance by obtaining the amount of heat consumed by heat storage. The amount of heat recovered by the exhaust heat recovery unit 20 can be obtained based on the heat storage system water temperature THWH and the index value of the exhaust temperature (for example, the amount of intake air of the internal combustion engine 10). The amount of heat received from the internal combustion engine 10 by the engine cooling system 16 is It can be determined based on the cooling system water temperature THWL and the index value of the temperature of the internal combustion engine 10 (for example, the intake air amount of the internal combustion engine 10). Further, the amount of heat consumed by the execution of heating can be obtained based on the target temperature and the outside air temperature THA, and the amount of heat consumed by the heat storage in the heat storage tank 21 when the water is passed through the heat storage tank 21 is the heat storage system water temperature. It can be determined based on THWH and tank water temperature THWT.

  And if it becomes the said situation (step S212: YES). The operation of the bypass valve 25 is controlled such that the cooling water passes through the bypass water passage 24 and the heat storage tank 21 (step S213), and the process is terminated. At this time, as shown in FIG. 15, the cooling water is “cooling system water channel 14 → first water channel 35 → heat storage system water channel 22 → exhaust heat recovery device 20 → heat storage system water channel 23 (bypass water channel 24 and heat storage tank 21) → second. The water is forcedly circulated in the order of “water channel 36 → water jacket 11”. Thereby, the heat storage to the heat storage tank 21 is performed in a state where the heating by the heater core 31 is continued.

As described above, according to the present embodiment, the effects described in the following (4) to (7) can be obtained in addition to the effects described in (1) above.
(4) When the heating by the heater unit 30 is performed, when the cooling system water temperature THWL is lower than the predetermined temperature T1, the operation of the switching valve 34 is controlled so as to enter the communication cut-off state, and the heater core provided in the bypass water channel 24 31 was used for heating. Therefore, even when the temperature of the cooling water in the engine cooling system 16 is low, the heater core provided in the heat storage system 28 and the cooling water in the heat storage system 28 raised in temperature through heat recovery by the exhaust heat recovery device 20 31 can be used for heating. In addition, since the cooling water in the engine cooling system 16 is not used for heating at this time, the temperature of the cooling water is increased earlier than the system in which the cooling water in the engine cooling system 16 is used for heating. Thus, the internal combustion engine 10 can be warmed up early.

  (5) When the heating by the heater unit 30 is performed, when the cooling system water temperature THWL is equal to or higher than the predetermined temperature T1, the operation of the switching valve 34 is controlled so as to be in the communication state, and the heater core provided in the bypass water channel 24 31 was used for heating. Therefore, when the temperature of the cooling water in the engine cooling system 16 is high, the amount of heat recovered through the exhaust heat recovery unit 20 of the heat storage system 28 as the amount of heat that can be used for heating using the heater core 31 and the internal combustion by the engine cooling system 16. A sufficient amount obtained by adding the amount of heat recovered from the engine 10 can be secured.

  (6) When performing the heating by the heater unit 30, when the cooling system water temperature THWL is lower than the predetermined temperature T1, the air volume of the blower 32 is suppressed to a small amount compared to when the cooling system water temperature THWL is equal to or higher than the predetermined temperature T1. did. Therefore, when heating is performed using only the cooling water in the heat storage system 28, high temperature hot air can be generated early and continuously over a long period of time.

  (7) When the cooling system water temperature THWL is lower than the predetermined temperature T1 when the heater unit 30 performs heating, the cooling water in the heat storage system 28 circulates through only the bypass water channel 24 without passing through the heat storage tank 21. Thus, the operation of the bypass valve 25 is controlled. Therefore, compared with a system in which the cooling water passes through the heat storage tank when the temperature of the cooling water in the heat storage system is low, the heat recovered by the exhaust heat recovery device 20 is efficiently used for heating using the heater core 31. Can be used.

(Other embodiments)
Each of the above embodiments may be modified as follows.
-In 1st Embodiment, when switching from the said communication cutoff state to the said communication state at the time of selection of heat dissipation mode, when the pressure of the cooling water in the said thermal storage system 28 (thermal storage system pressure PH) is higher than predetermined pressure The heat storage system pressure PH may be forcibly lowered prior to the switching. According to such a system, when the engine cooling system 16 and the heat storage system 28 are communicated with each other, the high-pressure cooling water stored in the heat storage system 28 can be prevented from flowing into the engine cooling system 16. Therefore, it can be avoided that the pressure of the cooling water in the engine cooling system 16 becomes excessively high due to the communication between the engine cooling system 16 and the heat storage system 28, and the reliability of the engine cooling system 16 is reduced. Can be suppressed.

FIG. 16 shows a specific example of processing for forcibly reducing the heat storage system pressure PH.
As shown in FIG. 16, in this process, it is first determined whether or not the tank water temperature THWT is higher than a predetermined temperature Th on the condition that the heat dissipation mode is selected (step S301).

  When the tank water temperature THWT is higher than the predetermined temperature Th (step S301: YES), the cooling water passes through the bypass passage 26 without passing through the exhaust heat recovery device 20 while maintaining the communication cutoff state. Then, the operation of the bypass valve 27 is controlled, the operation of the bypass valve 25 is controlled so that the cooling water passes through the heat storage tank 21, and the second water pump 33 is operated (step S302). In this case, it is determined that the heat storage system pressure PH is excessively high when the tank water temperature THWT is higher than the predetermined temperature Th. At that time, by driving the second water pump 33, the cooling water is forcedly circulated in the heat storage system 28, and the heat storage system is exchanged through heat exchange with the outside air through the walls of the heat storage system water channels 22 and 23. The water temperature THWH is lowered, and as a result, the heat storage system pressure PH is lowered. The process of step S302 functions as a forced lowering unit that forcibly decreases the pressure of the cooling water in the heat storage system.

  On the other hand, when the tank water temperature THWT is equal to or lower than the predetermined temperature Th (step S301: NO), the operation of the switching valve 34 is controlled so as to be in the communication state, and the cooling water passes through the exhaust heat recovery device 20. The operation of the bypass valve 27 is controlled so as to pass through the bypass passage 26 without being controlled, the operation of the bypass valve 25 is controlled so that the cooling water passes through the heat storage tank 21, and the second water pump 33 is operated (step). S303). In this case, assuming that the heat storage system pressure PH is not so high, switching from the communication cutoff state to the communication state and the release of the heat stored in the heat storage tank 21 to the engine cooling system 16 are executed.

  In addition, it replaces with the process of step S302, the low pressure chamber where the air blower for cooling the heat storage system 28 is newly provided through the ventilation to the heat storage system 28, the air blower is operated, or a comparatively low pressure cooling water is filled. Or a part of the cooling water in the heat storage system 28 may be introduced into the low pressure chamber.

  In the second embodiment, in addition to providing the heater core 31 and the blower 32 in the bypass water passage 24 of the heat storage system 28, the heater core and the blower are provided in the first water passage 35 and the second water passage 36 of the engine cooling system 16. It may be. In such a system, when the cooling water temperature THWL is equal to or higher than a predetermined temperature T1 when the heater unit 30 performs heating, the operation of the switching valve 34 is controlled so as to be in the communication cut-off state, and the engine cooling system 16 is provided. Heating may be performed using the heater core. Thereby, when the temperature of the internal combustion engine 10 is high, heating can be performed using the same heat while recovering a sufficient amount of heat from the internal combustion engine 10 through the engine cooling system 16.

  FIG. 17 shows a specific example of the process of switching the heater core used for heating as described above. Note that the series of processing shown in FIG. 17 is executed in place of the processing in steps S211 to S213 in FIG.

  As shown in FIG. 17, in this process, first, when the cooling system water temperature THWL becomes equal to or higher than the predetermined temperature T1 (step S202: NO or step S210: YES in FIG. 10), heating using the cooling water in the engine cooling system 16 is performed. Is possible, the drive of the blower corresponding to the heater core of the engine cooling system 16 is started and heating by the heater core is started (step S401). At this time, the operation of the bypass valve 25 is controlled so that the cooling water passes through both the heat storage tank 21 and the bypass water passage 24 (heater core 31), and the drive of the blower 32 is continued (step S402). Thereby, heating by the heater core 31 comes to be performed, performing the heat storage to the heat storage tank 21. FIG.

  And even if it is a case where it flows through the heat storage tank 21, it will be in the situation which does not cause the unnecessary fall of the thermal storage system water temperature THWH by the thermal storage to the thermal storage material 21a (refer FIG. 2) (step S402: YES), air blower The operation of the bypass valve 25 is controlled so that the cooling water flows only through the heat storage tank 21 (step S404). In this case, heating is performed only by the heater core provided in the engine cooling system 16, and only the heat storage in the heat storage tank 21 is performed in the heat storage system 28.

  -In 2nd Embodiment, as shown in FIG. 18, the water channel 41 which connects the heater core 31 and the engine cooling system 16 (specifically, the 1st water channel 35 and the 2nd water channel 36), the water channel 41, and Three control valves 42, 43, 44 for connecting only one of the bypass water channels 24 to the heater core 31 may be provided.

  In such a system, when the heating by the heater unit 30 is performed, the communication state is set, and when the cooling system water temperature THWL is lower than the predetermined temperature T1, the bypass valve 25 and each control valve are connected so that the heater core 31 is connected only to the bypass channel 24. What is necessary is just to control the action | operation of 42,43,44. When the cooling system water temperature THWL is equal to or higher than the predetermined temperature T1, the operations of the bypass valve 25 and the control valves 42, 43, 44 may be controlled so that the heater core 31 is connected only to the water passage 41 of the engine cooling system 16.

  Thus, when the temperature of the internal combustion engine 10 is low using one heater core 31, heating is performed using the cooling water in the heat storage system 28 that has been heated through heat recovery by the exhaust heat recovery device 20, and the internal combustion engine When the temperature of 10 is high, heating can be performed using the same heat while recovering a sufficient amount of heat from the internal combustion engine 10 through the engine cooling system 16.

  -In each embodiment, if an excessive increase in the cooling water temperature due to heat recovery of the exhaust heat recovery unit 20 and an unnecessary decrease in the cooling water temperature due to heat exchange in the exhaust heat recovery unit 20 can be appropriately suppressed, heat storage The bypass passage 26 and the bypass valve 27 of the system 28 may be omitted.

  DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Water jacket, 12 ... Radiator, 13, 14 ... Cooling system water channel, 15 ... Bypass water channel, 16 ... Engine cooling system, 17 ... First water pump, 19 ... Thermostat valve, 20 ... Exhaust heat recovery 21, heat storage tank, 21 a, heat storage material, 21 b, partitioned water channel, 22, 23, heat storage system water channel, 24, bypass water channel, 25, bypass valve, 26, bypass passage, 27, bypass valve, 28, heat storage system, 29 ... Exhaust passage, 30 ... Heater unit, 31, 37 ... Heater core, 32, 38 ... Blower, 33 ... Second water pump, 34 ... Switching valve, 35 ... First water channel, 36 ... Second water channel, 39 ... Electronic control Unit, 41 ... water channel, 42, 43, 44 ... control valve.

Claims (11)

An engine cooling system having a water jacket and a radiator formed inside the internal combustion engine, a cooling system water passage communicating with the water jacket and the radiator, and cooling water filled in the engine cooling system are forcibly circulated. In an engine system comprising a first water pump that pumps as much as possible, and a heat storage tank that stores cooling water therein,
An exhaust heat recovery unit for recovering the heat of the exhaust gas of the internal combustion engine, and a heat storage system water channel that communicates the exhaust heat recovery unit and the engine cooling system and is provided with the heat storage tank in the middle. A heat storage system, a second water pump that pumps the cooling water in the heat storage system to forcibly circulate, and a communication state that communicates the engine cooling system and the heat storage system with the communication shut off, and the engine cooling system An engine system comprising a switching valve for switching between a communication cutoff state in which cooling water is forcedly circulated inside the heat storage system. The engine system according to claim 1,
The engine system is characterized in that the switching valve is in the communication state for a predetermined period after the internal combustion engine is started, and is in the communication cut-off state after a predetermined period has elapsed. The engine system according to claim 2,
An engine system characterized in that the operation of the second water pump is stopped when the temperature of the cooling water in the heat storage system becomes higher than a predetermined temperature. The engine system according to claim 2 or 3,
When the pressure of the cooling water in the heat storage system is higher than a predetermined pressure when switching from the communication cut-off state to the communication state, forcibly reducing the pressure of the cooling water in the heat storage system prior to the switching An engine system further comprising a lowering means. The engine system according to claim 4, wherein
The engine system according to claim 1, wherein the forced lowering means operates the second water pump. The engine system according to claim 1,
The heat storage system is formed by connecting a heater core of a heater unit,
The engine system is configured to perform the heating using the heater core and the communication shut-off state when the temperature of the cooling water in the engine cooling system is lower than a predetermined temperature when performing the heating by the heater unit. An engine system characterized by The engine system according to claim 6, wherein
In the engine system, when the heater unit performs heating, when the temperature of the cooling water in the engine cooling system is equal to or higher than the predetermined temperature, the engine system is brought into the communication state and is heated using the heater core. An engine system characterized by that. The engine system according to claim 6, wherein
The heater unit has a heater core provided in the engine cooling system,
When the temperature of the cooling water in the engine cooling system is equal to or higher than the predetermined temperature when performing the heating by the heater unit, the engine system sets the heater core provided in the engine cooling system to the communication cutoff state. An engine system characterized by using and heating. The engine system according to claim 6, wherein
The engine system is in the communication cut-off state when performing heating by the heater unit, and when the temperature of cooling water in the engine cooling system is lower than the predetermined temperature, the heater core is connected only to the heat storage system, An engine system, wherein the heater core is connected only to the engine cooling system when the temperature of the cooling water in the engine cooling system is equal to or higher than the predetermined temperature. In the engine system according to any one of claims 6 to 9,
The heater unit includes a blower that blows air to the heater core connected to the heat storage system,
When the temperature of the cooling water in the engine cooling system is lower than the predetermined temperature when performing the heating by the heater unit, the engine system is compared with the temperature of the cooling water being equal to or higher than the predetermined temperature. An engine system characterized in that the blower volume of the blower is set to a small amount. In the engine system according to any one of claims 6 to 10,
The heat storage tank is provided with a heat storage material whose temperature changes through heat exchange with cooling water,
The heat storage system further includes a bypass water channel that bypasses the heat storage tank, and a bypass valve that changes a ratio of the cooling water flow rate of the bypass water channel and the cooling water flow rate of the heat storage tank,
When the engine system performs heating using a heater core connected to the heat storage system, when the temperature of the cooling water in the heat storage system is lower than a predetermined temperature, the cooling water does not pass through the heat storage tank. An engine system characterized by controlling the operation of the bypass valve so as to circulate only through the bypass channel.

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