JP2010163897A - Cooling equipment for internal-combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide cooling equipment for an internal combustion engine wherein heat of cooling water is appropriately utilized in a heat-utilizing section other than that of the internal combustion engine where while restraining reduction in fuel-economy, before completion of engine warm-up, heat of the cooling water flowing out of the water-jacket on the cylinder-head side is utilized. <P>SOLUTION: In a cooling channel 1 of the cooling equipment for the internal combustion engine, cooling-water flowing out of the water jacket 11a on the head side is passed through a water jacket 10a and a heater core 15 on the block side, and then returned to the water jacket 11a on the head side. An electronic control unit 50 controls so that: if before completion of engine warm-up, a demand for heating is made in a heater core 15, then a three-way valve 18 is controlled to a first state, simultaneously, a flow-control valve 19 is controlled in a fully closed state; thus, all of the cooling-water flowing out of the head-side water jacket 11a is controlled so as to bypass the water jacket 10a on the block side through a bypass channel 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling device for an internal combustion engine in which an independent water jacket is formed in a cylinder block and a cylinder head.

  2. Description of the Related Art Conventionally, some internal combustion engine cooling apparatuses include a cooling water channel in which a water jacket is independently formed in a cylinder block and a cylinder head, as disclosed in Patent Document 1, for example.

  In addition, when forming an independent water jacket for the cylinder block and the cylinder head, cooling water that has flowed out of the water jacket of the cylinder head before the completion of warm-up of the internal combustion engine is allowed to flow into the water jacket of the cylinder block. There is a device. In such a cooling device, the heat of the cylinder head whose temperature rises earlier than that of the cylinder block is supplied to the cylinder block, thereby suppressing the occurrence of knocking due to overheating of the cylinder head and increasing the temperature of the cylinder block. It promotes to reduce the friction in the movable part in the cylinder block.

JP 2004-44609 A

  By the way, when heating the passenger compartment, there is a case where a cooling water passage having a configuration in which the cooling water flowing out from the water jacket of the cylinder head flows into the water jacket and the heater core of the cylinder block may be employed. In such a case, the heat of the cooling water flowing out from the cylinder head before the warm-up of the internal combustion engine is used in both the cylinder block and the heater core. In some cases, the heater core cannot sufficiently dissipate the cooling water, and a desired heating performance cannot be obtained. Therefore, conventionally, in order to obtain a desired heating performance, the engine rotation speed is increased regardless of the operation request of the internal combustion engine to increase the amount of cooling water flowing out from the cylinder head. There is a problem that fuel consumption deteriorates due to an increase in fuel consumption. Such a problem is not limited to the case where the heater core is connected to the cooling water channel, but may occur in the same manner when another heat utilization unit is connected to the cooling water channel.

  The present invention has been made in view of such circumstances, and an object thereof is to utilize the heat of cooling water flowing out from the water jacket on the cylinder head side before the completion of engine warm-up while suppressing deterioration of fuel consumption. An object of the present invention is to provide a cooling device for an internal combustion engine that can appropriately use the heat of cooling water in a heat utilization section other than the internal combustion engine.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
According to the first aspect of the present invention, a water pump, a head side water jacket formed on the cylinder head, a block side water jacket formed on the cylinder block, and a heat utilization part utilizing the temperature of the cooling water are connected. Cooling of the internal combustion engine having a cooling water passage, wherein the cooling water flowing out from the head side water jacket through the driving of the water pump flows into the block side water jacket and the heat utilization part and then flows into the head side water jacket again. In the apparatus, the cooling water channel is connected to an upstream side and a downstream side of the block-side water jacket so that the cooling water bypasses the block-side water jacket, and the cooling water flows out of the head-side water jacket. Through the bypass channel. And adjusting means for adjusting the amount of cooling water that bypasses the water jacket on the side of the block, before the completion of warming up of the engine, according to the use request of the temperature of the cooling water in the heat utilization section, The gist is to control the adjusting means so that the amount of cooling water bypassing the water jacket is adjusted.

  According to the above configuration, before the completion of warm-up of the internal combustion engine, the cooling that bypasses the block-side water jacket out of the cooling water that has flowed out of the head-side water jacket in accordance with the use requirement of the temperature of the cooling water in the heat utilization unit. Since the amount of water is adjusted, the amount of heat released from the cylinder block in the cooling water flowing out from the head-side water jacket can be adjusted. Therefore, it is possible to suppress the occurrence of a situation in which the heat of the cooling water cannot be sufficiently utilized in the heat utilization unit due to an increase in the heat radiation amount of the cooling water flowing out from the head side water jacket in the cylinder block. be able to. That is, according to the above configuration, the heat of the cooling water flowing out from the head-side water jacket can be preferentially used in the heat utilization unit rather than the cylinder block, and thus the heat heat is sufficiently utilized in the heat utilization unit. can do. “Before completion of warming up of the internal combustion engine” means that the temperature of the cooling water in each of the head-side and block-side water jackets becomes a target temperature to be finally controlled.

  Further, since the heat of the cooling water can be sufficiently utilized in the heat utilization part in this way, it is not necessary to increase the engine rotation speed when using heat in the heat utilization part, and the fuel consumption caused by the increase in the engine rotation speed Can be prevented.

  In addition, the said structure is not bypassed with the state which all of the cooling water which flowed out from the head side water jacket bypasses a block side water jacket according to the presence or absence of the utilization request | requirement of the cooling water temperature in a heat utilization part. Including the case of switching to the state.

  According to a second aspect of the present invention, in the first aspect of the invention, after the warm-up of the engine is completed, the temperature of the cooling water in the head-side water jacket becomes the first temperature, and the block-side water jacket. The block-side water jacket is passed through the bypass channel of the coolant that has flowed out of the head-side water jacket so that the temperature of the cooling water inside becomes a second temperature that is higher than the first temperature and lower than the boiling point of the cooling water. The gist is to control the adjusting means so that the amount of cooling water to be bypassed is adjusted.

  Knocking tends to occur when the temperature of the cylinder head increases. On the other hand, the cylinder block does not significantly affect the occurrence of knocking even if the temperature becomes high to some extent. In addition, although there is a limit, the higher the temperature of the cylinder head and the cylinder block, the more the friction generated at each movable part can be reduced. In this respect, according to the above configuration, the cooling water in the head-side water jacket can be controlled to a temperature lower than the cooling water in the block-side water jacket, so that occurrence of knocking in the internal combustion engine can be suppressed. . Further, since the cooling water in the block-side water jacket can be controlled to a temperature higher than that in the head-side water jacket, it is possible to reduce the friction in the movable part in the cylinder block. Note that the first temperature is, for example, an upper limit temperature at which knocking can be suppressed, so that the occurrence of knocking in the internal combustion engine is suppressed, and the friction generated at the movable portion in the cylinder head within the range where this suppression is possible. Can be minimized.

  Thus, according to the above configuration, the temperature of the cylinder head and the cylinder block are individually set so that the temperature of the cooling water in the head-side water jacket is lower than the temperature of the cooling water in the block-side water jacket. Can be optimized.

  In addition, after the warm-up is completed, heat generated in both the cylinder block and the cylinder head is released to the cooling water, and when a radiator (radiator) is provided in the cooling water passage, the cooling water is supplied to the cylinder block and the cylinder head. The radiator receives heat from the radiator. And in the said structure, the temperature of the cooling water in a block side water jacket is controlled to 2nd temperature higher than the 1st temperature mentioned above. Therefore, the cooling water in the block-side water jacket is controlled to the same temperature (first temperature) as the cooling water in the head-side water jacket, that is, compared to the case where the cylinder block is cooled to the same extent as the cylinder head by the cooling water. As a result, the heat dissipation amount of the cooling water in the radiator can be reduced. As a result, the radiator can be reduced in size, and the entire cooling device can be reduced in size. In addition, when the heat dissipation capacity of a single heat utilization unit is sufficiently high, or when the total heat dissipation capacity of a plurality of heat utilization units is sufficiently high, it is possible to further reduce the size of the radiator. It can also be abolished.

  The completion of warm-up of the internal combustion engine is when the temperature of the cooling water in each of the water jackets on the head side and the block side becomes the target temperature to be finally controlled. Specifically, the head side water jacket The temperature of the cooling water inside becomes the first temperature and the temperature of the cooling water inside the block-side water jacket reaches the second temperature.

  According to a third aspect of the present invention, in the cooling apparatus for an internal combustion engine according to the first or second aspect, the upper limit temperature at which the temperature of the cooling water in the head-side water jacket can suppress knocking when the water pump is driven. The gist is to start on the condition that the above is reached.

  If the cooling water temperature of the head side water jacket is lower than the upper limit temperature at which knocking can be suppressed, knocking will not occur in the internal combustion engine, so by stopping the cooling water supply to the head side water jacket, The temperature of the cylinder head can be raised early. Further, when the cooling water temperature of the head-side water jacket is lower than the upper limit temperature, heat supply cannot be expected so much even if the heat of the cooling water is used in the cylinder block or the heat utilization unit. Therefore, in the above configuration, the water pump drive is stopped until the coolant temperature in the head side water jacket reaches the upper limit temperature at which knocking can be suppressed, thereby suppressing unnecessary water pump drive. can do. Further, when the temperature of the cooling water in the head-side water jacket reaches the above upper limit temperature, the water pump starts to be driven, so that the cylinder head can be cooled to suppress the occurrence of knocking. The generated heat can be effectively used in the cylinder block and the heat utilization section.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the cooling water channel is located downstream of the bypass water channel connecting portion on the upstream side of the block-side water jacket and the block. A heat storage water channel connected to the upstream side of the bypass water channel connection portion on the downstream side of the side water jacket and provided with a heat storage tank for storing high-temperature cooling water and a heat storage pump, and at the time of starting the engine The gist is that the coolant stored in the heat storage tank is circulated through the block-side water jacket through the drive of the heat storage pump.

  When the heat of the cooling water flowing out from the head side water jacket is used in the heat utilization part in preference to the cylinder block before the internal combustion engine is warmed up, the cooling water flowing out from the head side water jacket is used. There is a concern that inconveniences such as it becomes difficult to heat the cylinder block using this heat. In this regard, according to the same configuration, the temperature of the cylinder block can be quickly raised by the heat of the cooling water stored in the heat storage tank. Therefore, the friction generated in the movable part of the cylinder block when the engine is started can be reduced early.

  The invention according to claim 5 is the cooling stored in the heat storage tank in the invention according to claim 4 on condition that the cooling water stored in the heat storage tank is equal to or higher than a predetermined heat storage temperature. The gist is to circulate water through the block-side water jacket.

  According to the above configuration, when the temperature of the cooling water stored in the heat storage tank is low and heating of the cylinder block cannot be expected, the cooling water in the heat storage tank is not circulated to the cylinder block. Unnecessary driving of the pump and temperature drop of the cylinder block can be suppressed.

  Further, when the cooling water passage has a heat storage water passage, the cooling water flowing out from the block side water jacket through the drive of the heat storage pump after completion of warming up of the engine as in the invention according to claim 6. A mode of storing in the heat storage tank can be employed.

  In the invention of claim 6, when applied to the invention of claim 2, the temperature of the cooling water in the block-side water jacket is maintained at a temperature higher than the cooling water temperature in the head-side water jacket. Therefore, the high-temperature cooling water that has flowed out of the block-side water jacket can be stored in the heat storage tank.

The schematic diagram which shows a cooling water channel and its periphery structure in one Embodiment which concerns on the cooling device of the internal combustion engine of this invention. The flowchart which shows the execution procedure of the cooling water circulation control in a cooling water channel in the embodiment. The flowchart which shows the execution procedure of the cooling water circulation control in a cooling water channel in the embodiment. In the same embodiment, the schematic diagram of the cooling device which shows the flow of the cooling water at the time of distribute | circulating the cooling water in the thermal storage tank to a block side water jacket at the time of engine starting. The schematic diagram of the cooling device which shows the flow of the cooling water when all the cooling water which flowed out from the head side water block bypasses the block side water jacket when there is a heating request before engine warm-up in the same embodiment. In the same embodiment, the schematic diagram which shows the flow of the cooling water at the time of storing the cooling water which flowed out from the block side water block in the heat storage tank after engine warm-up completion. FIG. 4 is a schematic diagram showing a flow of cooling water when a part of cooling water flowing out from the head side water jacket flows through the block side water jacket in a state where the thermostat is closed after completion of engine warm-up in the same embodiment. In the same embodiment, the schematic diagram which shows the flow of the cooling water in the state which the thermostat opened after engine warm-up completion.

Hereinafter, an embodiment in which the present invention is embodied in a cooling device for an in-vehicle internal combustion engine will be described with reference to FIGS.
FIG. 1 shows a cooling device according to this embodiment. As shown in FIG. 1, the cooling device includes a cooling water channel 1 and an electronic control device 50 that executes circulation control of the cooling water in the cooling water channel 1. The cooling water channel 1 includes a main water channel 2, a bypass water channel 4, a heat storage water channel 5, a heat storage bypass water channel 6, and a radiator water channel 7.

  As shown in FIG. 1, in the present embodiment, a block-side water jacket 10a is formed in the cylinder block 10, and a head-side water jacket 11a is formed in the cylinder head 11. These water jackets 10a, 11a are Independent of each other. In the main water channel 2, the head side water jacket 11 a, the heater core 15 through which the cooling water flows to dissipate heat for heating the vehicle interior, the water pump 17, and the block side water jacket 10 a are connected in series in this order. The cooling water is configured to circulate in this order. With such a configuration, the main water channel 2 according to the present embodiment flows into the heater core 15 and the block-side water jacket 10a from the cooling water flowing out from the head-side water jacket 11a. Heating of the cylinder block 10 is promoted.

  Moreover, in the cooling water channel 1, the bypass water channel 4 for the cooling water which flows through the main water channel 2 to bypass the block side water jacket 10a is connected to the upstream side and the downstream side of the block side water jacket 10a in the main water channel 2. . The main water channel 2 is provided with a three-way valve 18 at the connection site of the bypass water channel 4 on the upstream side of the block-side water jacket 10a, while the upstream side of the connection site of the bypass water channel 4 on the downstream side of the block-side water jacket 10a. A flow rate adjusting valve 19 is provided.

  The three-way valve 18 is set to the first to third states by electronic control, thereby changing the communication state of the block-side water jacket 10a side and the bypass water passage 4 with respect to the water pump 17 side of the main water passage 2. It is. Specifically, the three-way valve 18 blocks communication between the block-side water jacket 10a and the bypass water channel 4 with respect to the water pump 17 side of the main water channel 2 in the first state. Further, in the second state, the three-way valve 18 communicates the block-side water jacket 10a side with the water pump 17 side of the main water channel 2 and blocks communication between the main water channel 2 and the bypass water channel 4 in the second state. , Both the block-side water jacket 10 a side and the bypass water channel 4 are communicated with the water pump 17 side of the main water channel 2.

  The flow rate adjusting valve 19 is a valve whose opening degree can be adjusted by electronic control, and variably adjusts the flow rate of the cooling water flowing out from the block-side water jacket 10a. In the present embodiment, the amount of the cooling water that bypasses the block-side water jacket 10a side among the cooling water that has flowed through the main water channel 2 is variably controlled through the adjustment of the opening degree of the flow rate adjusting valve 19. In the present embodiment, when there is a request for heating the passenger compartment before the warm-up of the internal combustion engine is completed, all of the cooling water flowing out from the head-side water jacket 11a bypasses the block-side water jacket 10a through the bypass water channel 4. In addition, the flow rate adjusting valve 19 is controlled to be fully closed. That is, in this embodiment, the flow rate adjusting valve 19 constitutes an adjusting means.

  The heat storage water channel 5 of the cooling water channel 1 is provided with a heat storage pump 31 and a heat storage tank 30 for storing high-temperature cooling water in this order. The upstream end of the heat storage water channel 5 is connected between the block-side water jacket 10a and the flow rate adjusting valve 19 in the main water channel 2, and the downstream end is connected to the three-way valve 18 and the block-side water jacket 10a in the main water channel 2. Connected between. With such a configuration, when the heat storage pump 31 is driven when the three-way valve 18 is in the first state and the flow rate adjustment valve 19 is in the fully closed state, the closed water passage through which the coolant circulates through the heat storage tank 30 and the block-side water jacket 10a. Is configured. In the present embodiment, with such a configuration, the cooling water stored in the heat storage tank 30 is circulated to the block side water jacket 10a or flows out of the block side water jacket 10a through the drive of the heat storage pump 31. The cooling water can be stored in the heat storage tank 30.

  In the heat storage water channel 5, a heat storage bypass water channel 6 to be bypassed for bypassing the heat storage pump 31 is connected to the upstream side and the downstream side of the heat storage pump 31. A check valve 32 that allows only the flow of cooling water from the upstream side to the downstream side of the heat storage pump 31 is provided.

  The radiator water channel 7 is provided with a radiator 20 for radiating heat of the cooling water. The radiator water channel 7 has an upstream end connected to the middle of the head-side water jacket 11 a and a downstream end connected between the heater core 15 and the water pump 17 in the main water channel 2. In the main water channel 2, a thermostat 16 is provided at a portion to which the downstream end of the radiator water channel 7 is connected. The thermostat 16 is provided with a flow path through which the cooling water flowing through the main water channel 2 flows, and the cooling water flowing through the radiator 20 enters the main water channel 2 according to the temperature of the cooling water flowing through the flow channel. It is switched between a state where it can flow and a state where it cannot flow. Specifically, when the temperature of the cooling water flowing through the flow path in the thermostat 16, that is, the temperature of the cooling water flowing from the heater core 15 to the water pump 17 in the main water channel 2 is less than a predetermined temperature, the thermostat 16 is closed. As a result, the inflow of cooling water from the downstream end of the radiator water channel 7 to the main water channel 2 becomes impossible. Further, when the temperature of the cooling water flowing through the thermostat 16 in the main water channel 2 is equal to or higher than a predetermined temperature, the thermostat 16 is in an open state, and the cooling water can flow into the main water channel 2 from the downstream end of the radiator water channel 7. It becomes. The predetermined temperature is set to a temperature lower than a first temperature Th described later.

  Cooling water circulation control in the cooling water channel 1 configured as described above is executed by the electronic control device 50 mounted on the vehicle. The electronic control unit 50 includes a CPU that executes various arithmetic processes related to engine control and circulation control of the cooling water, a ROM that stores programs and data necessary for the control, and a RAM that temporarily stores arithmetic results of the CPU. The input / output port for inputting / outputting signals to / from the outside is provided.

  The input port of the electronic control unit 50 includes a head-side water temperature sensor 51 that detects the temperature of the cooling water in the head-side water jacket 11a, a block-side water temperature sensor 52 that detects the temperature of the cooling water in the block-side water jacket 10a, A heat storage water temperature sensor 53 for detecting the temperature of the cooling water stored in the heat storage tank 30 is connected. Further, although not shown in the figure, the electronic control unit 50 receives information on the operating state of the internal combustion engine and information on the heating request by the vehicle user through an input port. The output port of the electronic control unit 50 is connected to a drive circuit for the water pump 17 and the heat storage pump 31 and a flow rate adjusting valve 19 drive circuit for the three-way valve 18.

  With the above configuration, the electronic control unit 50 circulates the cooling water in the cooling water channel 1 based on the operating state of the internal combustion engine, the heating request by the user of the vehicle, and the detection signals of the water temperature sensors 51, 52, and 53. Execute control.

  Specifically, when there is a heating request in the vehicle compartment before the completion of warming-up of the internal combustion engine, the electronic control device 50 causes the heat of the cooling water flowing out from the head-side water jacket 11a to flow in the heater core 15 rather than the cylinder block 10. In order to use it preferentially, all the cooling water is controlled to bypass the block-side water jacket 10 a through the bypass water channel 4. In addition, after the warming-up of the internal combustion engine is completed, the electronic control unit 50 causes the temperature of the cooling water flowing through the head-side water jacket 11a to become a first temperature Th described later, and flows out from the temperature of the cooling water flowing through the block-side water jacket 10a. The temperature of the cooled cooling water is controlled to be a second temperature Tb that is higher than the first temperature Th. Note that the warm-up completion is when the temperature of the cooling water in the head-side water jacket 11a and the block-side water jacket 10a reaches a target temperature that should be finally controlled. This is when the temperature of the cooling water reaches the first temperature Th and the temperature of the cooling water in the block-side water jacket 10a reaches the second temperature Tb. Furthermore, the electronic control unit 50 controls the cooling water stored in the heat storage tank 30 when the engine is started to flow to the block-side water jacket 10a, and the cooling water flowing out from the block-side water jacket 10a is used for this heat storage. Control is performed so as to be stored in the tank 30.

  Hereinafter, the cooling water circulation control executed by the electronic control unit 50 will be described with reference to FIGS. 2 and 3 are flowcharts showing the execution procedure of the circulation control of the cooling water, and FIGS. 4 to 8 show the flow of the cooling water in the circulation control.

  The cooling water circulation control shown in FIGS. 2 and 3 is started when the internal combustion engine is started. In this control, first, as shown in FIG. 2, whether or not the temperature of the cooling water stored in the heat storage tank 30 is equal to or higher than a predetermined heat storage temperature Ts in step S11 based on the detection signal of the heat storage water temperature sensor 53. Is determined. That is, when the temperature of the cooling water stored in the heat storage tank 30 is low, heating of the cylinder block 10 by this cooling water cannot be expected, and the temperature of the cylinder block 10 may be lowered. Therefore, here, the temperature of the cooling water stored in the heat storage tank 30 is equal to or higher than the predetermined heat storage temperature Ts, and whether or not the temperature increase of the cylinder block 10 is promoted by the cooling water stored in the heat storage tank 30. Is determined. The predetermined heat storage temperature Ts may be a constant temperature, for example, or may be set to a higher temperature as the outside air temperature is higher.

  And when it determines with the temperature of cooling water being more than predetermined | prescribed heat storage water temperature Ts in step S11, it will move to step S12 and while controlling the three-way valve 18 to a 1st state, the flow regulating valve 19 will be in a fully closed state To control. As a result, a closed water passage is formed in which the cooling water circulates between the heat storage tank 30 and the block-side water jacket 10a. Therefore, the process proceeds to step S13, and the heat storage pump 31 is driven for a predetermined period (for example, several minutes). By driving the heat storage pump 31, the cooling water circulates between the heat storage tank 30 and the block-side water jacket 10a as shown in FIG. Thereby, the cooling water with the predetermined heat storage temperature Ts or more stored in the heat storage tank 30 circulates in the block-side water jacket 10a, and the cylinder block 10 can be heated up early after the engine is started.

  Next, the process proceeds to step S14 in FIG. 2, and based on the detection signal of the head side water temperature sensor 51, it is determined whether or not the temperature of the cooling water in the head side water jacket 11a is equal to or higher than the first temperature Th. In the previous step S11, when the temperature of the cooling water in the heat storage tank 30 is lower than the predetermined heat storage temperature Ts, the cooling water in the heat storage tank 30 is circulated to the block-side water jacket 10a. Instead, the process proceeds to step S14.

  Here, the first temperature Th is set to an upper limit temperature at which knocking can be suppressed at the cooling water temperature of the head-side water jacket 11a, and the upper limit temperature is derived in advance through experiments or the like. That is, when the temperature of the cylinder head 11 increases in the internal combustion engine, knocking is likely to occur. However, the occurrence of knocking can be suppressed until the temperature of the cooling water detected by the head-side water temperature sensor 51 reaches the first temperature Th. When this first temperature Th is exceeded, knocking is likely to occur. And the determination of this step S14 is repeated until the temperature of the cooling water of the head side water jacket 11a becomes more than 1st temperature.

  If it is determined in step S14 that the temperature of the cooling water in the head-side water jacket 11a is equal to or higher than the first temperature, the process proceeds to step S15 in FIG. 3, and it is determined whether or not there is a heating request in the vehicle interior. And when there exists a heating request | requirement of a vehicle interior, it moves to step S16, and while controlling the three-way valve 18 to a 2nd state, the flow regulating valve 19 is controlled to a fully closed state. Then, the process proceeds to step S17, and driving of the water pump 17 is started. Thus, as shown in FIG. 5, when there is a heating request, the cooling water flowing out from the head-side water jacket 11a flows through the heater core 15, and then all bypasses the block-side water jacket 10a. The heat of the cooling water flowing out from the side water jacket 11a can be used with priority over the heater core 15.

  Note that, until the temperature of the cooling water in the head-side water jacket 11a reaches the first temperature Th, the heat supply cannot be expected so much even if the heat of the cooling water is used for heating the heater core 15 and the like. Further, when the temperature of the cooling water in the head-side water jacket 11a is lower than the first temperature Th, knocking does not occur in the internal combustion engine. Therefore, by stopping the driving of the water pump 17 and stopping the supply of the cooling water to the head side water jacket 11a until the temperature of the cooling water of the head side water jacket 11a reaches the first temperature Th, The temperature of the cylinder head 11 can be raised early to heat the movable part in the cylinder head 11. Accordingly, the driving of the water pump 17 is started on the condition that the temperature of the cooling water in the head-side water jacket 11a has reached the first temperature Th.

  Thereafter, the process proceeds to step S18 in FIG. 3, and it is determined based on the detection signal of the block-side water temperature sensor 52 whether or not the block-side water jacket 10a is equal to or higher than the second temperature Tb. When it is determined in step S18 that the block-side water jacket 10a is equal to or higher than the second temperature Tb, it is determined that the internal combustion engine has been warmed up, the process proceeds to step S19, and the heat storage pump 31 is driven for a predetermined period. . As a result, a closed water passage including the heat storage tank 30 and the block-side water jacket 10a is configured by the control of the valves 18 and 19 in the previous step S16, so that the cooling water is supplied to the block-side water as shown in FIG. It circulates between the jacket 10a and the heat storage tank 30, and the heat storage tank 30 stores the cooling water having the second temperature Tb. As shown in FIG. 6, in the main water channel 2, the cooling water that has flowed out of the head-side water jacket 11a bypasses the block-side water jacket 10a, as in the embodiment shown in FIG.

  Here, the second temperature Tb is set to a temperature higher than the first temperature Th and lower than the boiling point of the cooling water. That is, it has been confirmed by the inventor that knocking hardly occurs even when the cooling water in the block-side water jacket 10a becomes equal to or higher than the first temperature Th. In addition, although there is a limit, the effect of reducing the friction generated in the movable part in the cylinder block 10 is obtained when the temperature of the cylinder block 10 is higher to some extent. Therefore, by setting the second temperature Tb to a temperature higher than the first temperature Th and lower than the boiling point of the cooling water, the friction generated in the movable part in the cylinder block 10 can be reduced as much as possible. Moreover, since only the cooling water for the block-side water jacket 10a is stored in the heat storage tank 30, it is possible to store the cooling water at the second temperature Tb higher than the first temperature Th. In step S17, the predetermined period for driving the heat storage pump 31 is, for example, until the entire amount of cooling water in the heat storage tank 30 is replaced with the cooling water having the second temperature Tb flowing out from the block-side water jacket 10a. Set to time.

  When the storage of the high-temperature cooling water in the heat storage tank 30 is completed, the process proceeds to step S20 in FIG. 3, the three-way valve 18 is controlled to the third state, the process proceeds to step S21, and the opening degree control of the flow rate adjustment valve 19 is controlled. Start. Thereby, as shown in FIG. 7, a part of the cooling water flowing out from the head-side water jacket 11a flows through the block-side water jacket 10a. The electronic control unit 50, specifically, based on the detection signals of the head-side water temperature sensor 51 and the block-side water temperature sensor 52, the temperature of the cooling water in the head-side water jacket 11a becomes the first temperature Th, and the block The opening control of the flow rate adjusting valve 19 is started so that the temperature of the cooling water in the side water jacket 10a becomes the second temperature Tb. That is, when the cooling water temperature detected by the block-side water temperature sensor 52 is higher than the second temperature Tb, the amount of cooling water flowing through the block-side water jacket 10a increases, and the cooling water temperature detected by the sensor 52 becomes the first temperature. When the temperature is lower than the two temperatures Tb, the opening degree of the flow rate adjusting valve 19 is controlled so that the amount of cooling water flowing through the block-side water jacket 10a is reduced. By such control, it is possible to suitably reduce the friction of the movable parts in the cylinder head 11 and the cylinder block 10 while suppressing the occurrence of knocking in the internal combustion engine.

  At this time, although the heat storage pump 31 in the heat storage water channel 5 is stopped, as shown in FIG. 7, a part of the cooling water that has flowed out of the block-side water jacket 10 a passes through the heat storage bypass water channel 6. It is stored in. Therefore, after the temperature of the cooling water flowing through the block-side water jacket 10a becomes equal to or higher than the second temperature Tb by the processing of the previous steps S18 and S19, the high-temperature cooling water can be immediately stored in the heat storage tank 30. Even after that, high-temperature cooling water can always flow into the heat storage tank 30 through the heat storage bypass water channel 6. Therefore, when the internal combustion engine is stopped, the cooling water having the second temperature Tb can be reliably stored in the heat storage tank 30. In addition, with such a configuration, it is not necessary to provide a valve or the like for preventing the outflow after the high-temperature cooling water is once stored in the heat storage tank 30.

  In a state where the amount of heat generated in both the cylinder block 10 and the cylinder head 11 is not so large, this heat is radiated only by the heater core 15 and the temperature of the cooling water flowing through the thermostat 16 in the main water channel 2 is less than a predetermined temperature. Therefore, as shown in FIG. 7, the thermostat 16 is maintained in a closed state. However, if the heat generated in both the cylinder block 10 and the cylinder head 11 increases, the heater core 15 alone cannot sufficiently dissipate heat, the temperature of the cooling water flowing through the thermostat 16 in the main water channel 2 becomes a predetermined temperature or more, and the thermostat 16 Opened. As a result, as shown in FIG. 8, the cooling water can be circulated between the radiator water channel 7 and the main water channel 2, and the cooling water flowing out from the head-side water jacket 11 a flows through the heater core 15 and the radiator 20. The heat given and received when flowing through the block-side water jacket 10a and the head-side water jacket 11a is radiated.

  In the present embodiment, the temperature of the cooling water in the block-side water jacket 10a is controlled to a second temperature higher than the cooling water in the head-side water jacket 11a. Therefore, the cooling water in the block-side water jacket 10a is also supplied from the cylinder block 10 to the cooling water flowing in the block-side water jacket 10a as compared with the case where the cooling water in the head-side water jacket 11a is controlled to the same first temperature. The heat given to you can be reduced. Therefore, the cooling water in the block-side water jacket 10a can also be reduced in size compared to the case where the cooling water in the head-side water jacket 11a is controlled to the same first temperature as the cooling water in the head-side water jacket 11a. The overall size can be reduced.

Then, after the opening degree control of the flow rate adjusting valve 19 is started in this way, this control is finished, and when the internal combustion engine stops thereafter, the water pump 17 is stopped by another process.
On the other hand, if it is determined in step S15 shown in FIG. 3 that there is no request for heating the passenger compartment, the process proceeds to step S22, where the three-way valve 18 is controlled to the third state and the flow rate adjustment valve 19 is fully opened. Then, the process proceeds to step S23, and the driving of the water pump 17 is started. Thereby, the cooling water flowing out from the head-side water jacket 11a is circulated to the block-side water jacket 10a as much as possible, and the block-side water jacket 10a is quickly heated by this cooling water.

  And if the temperature of the cooling water which flows through the block side water jacket 10a becomes more than 2nd temperature Th by determination of step S24, it will move to previous step S21. Thereby, based on the detection signals of the head-side water temperature sensor 51 and the block-side water temperature sensor 52, the temperature of the cooling water in the head-side water jacket 11a becomes the first temperature Th, and the temperature of the cooling water in the block-side water jacket 10a becomes The opening degree control of the flow rate adjusting valve 19 is started so as to reach the second temperature Tb. At this time, the cooling water circulates as shown in FIG. 7, and thereafter, the cooling water can be circulated between the radiator water channel 7 and the main water channel 2 through the thermostat 16, and as shown in FIG. Circulates. When the temperature of the cooling water flowing through the block-side water jacket 10a becomes equal to or higher than the second temperature Th, as shown in FIG. 6, first, the temperature rises above the second temperature Th flowing out from the block-side water jacket 10a into the heat storage tank 30. The cooling water may be stored, and then the cooling water may be circulated in the manner shown in FIG. When this control is finished and the internal combustion engine is stopped, the water pump 17 is stopped by another process.

According to this embodiment described above, the following effects can be obtained.
(1) In the present embodiment, the cooling water flowing out from the head-side water jacket 11a is circulated through the block-side water jacket 10a and the heater core 15 and then again flows into the head-side water jacket 11a. If there is a request for heating of the passenger compartment before the warming-up of the engine is completed, the three-way valve 18 is controlled to the first state, the flow rate adjusting valve 19 is controlled to the fully closed state, and the head side water jacket 11a is controlled. All the cooling water flowing out from the block bypasses the block-side water jacket 10a through the bypass water channel 4. Thereby, it is possible to prevent the cooling water flowing out from the head-side water jacket 11 a from being radiated by the cylinder block 10. Therefore, the heat of the cooling water flowing out from the head-side water jacket 11a can be preferentially used in the heater core 15 over the cylinder block 10 before the warm-up of the internal combustion engine is completed. It can be fully utilized to meet the heating requirements of the passenger compartment.

  In addition, since the temperature of the cooling water can be sufficiently utilized in the heater core 15 as described above, it is not necessary to increase the engine rotation speed when using the heat in the heater core 15, and the fuel consumption is deteriorated due to the increase in the engine rotation speed. Can be suppressed.

  (2) In the present embodiment, the driving of the water pump 17 is started on the condition that the temperature of the cooling water in the head-side water jacket 11a has reached the first temperature Th. As a result, when the cooling water in the head-side water jacket 11a is lower than the first temperature Th, knocking does not occur in the internal combustion engine, so the supply of cooling water to the head-side water jacket 11a is stopped. As a result, the temperature of the cylinder head 11 can be raised quickly.

  Further, when the temperature of the cooling water in the head side water jacket 11a is lower than the first temperature Th, even if the heat of the cooling water is used in the cylinder block 10 or the heater core 15, the heat supply cannot be expected so much. Therefore, unnecessary driving of the water pump 17 can be suppressed until the temperature of the cooling water in the head-side water jacket 11a reaches the first temperature Th. Further, when the temperature of the cooling water in the head-side water jacket 11a reaches the first temperature Th, the driving of the water pump 17 is started, so that the cylinder head 11 can be cooled and occurrence of knocking can be suppressed. The heat generated in the cylinder head 11 can be effectively used in the cylinder block 10 and the heater core 15.

  (3) In the present embodiment, after the warm-up of the internal combustion engine is completed, the temperature of the cooling water in the head-side water jacket 11a becomes the first temperature Th, and the temperature of the cooling water in the block-side water jacket 10a is the above-described temperature. The flow rate adjusting valve 19 is controlled so that the amount of cooling water that bypasses the block-side water jacket 10a through the bypass water channel 4 is adjusted so that the second temperature Tb is reached. Thereby, it is possible to reduce the friction generated in the movable parts of the cylinder head 11 and the cylinder block 10 while suppressing the occurrence of knocking in the internal combustion engine, and to optimize the temperatures of the cylinder head 11 and the cylinder block 10 individually. Can be

  Further, after the warm-up of the internal combustion engine is completed, heat generated in both the cylinder block 10 and the cylinder head 11 is released to the cooling water flowing through the cooling water passage 1. And since the temperature of the cooling water in the block side water jacket 10a is controlled to 2nd temperature Tb higher than 1st temperature Th, the case where the cooling water in the block side water jacket 10a is also controlled to 1st temperature Th In comparison, the heat dissipation requirement for cooling water can be reduced. Therefore, the radiator 20 can be reduced in size, and the cooling device as a whole can be reduced in size.

  (4) In the present embodiment, in the cooling water channel 1, the heat storage water channel 5 in which the heat storage tank 30 and the heat storage pump 31 are provided is downstream of the connection part of the bypass water channel 4 on the upstream side of the block-side water jacket 10 a and It is connected to the upstream side of the connection part of the bypass water channel 4 on the downstream side of the block-side water jacket 10a. When the engine is started, the cooling water stored in the heat storage tank 30 is circulated to the block-side water jacket 10a through the drive of the heat storage pump 31. Accordingly, when the heat of the cooling water flowing out from the head-side water jacket 11a is used in the heater core 15 in preference to the cylinder block 10 before the warm-up of the internal combustion engine is completed, the heat of the cooling water is used. Although there is a concern that it may be difficult to heat the cylinder block 10 using the heat, the temperature of the cylinder block 10 can be quickly raised by the heat of the cooling water stored in the heat storage tank 30. Therefore, the friction generated in the movable part of the cylinder block 10 when the engine is started can be reduced early.

  (5) In the present embodiment, the cooling water stored in the heat storage tank 30 is distributed to the block-side water jacket 10a on condition that the cooling water stored in the heat storage tank 30 is equal to or higher than a predetermined heat storage temperature Ts. I try to let them. Therefore, when the temperature of the cooling water stored in the heat storage tank 30 is low and heating of the cylinder block 10 cannot be expected, the cooling water in the heat storage tank 30 is not circulated to the cylinder block 10. Unnecessary driving of the pump 31 and a temperature drop of the cylinder block 10 can be suppressed.

  (6) In this embodiment, after the warm-up of the engine is completed, the cooling water flowing out from the block-side water jacket 10a through the drive of the heat storage pump 31 is stored in the heat storage tank 30. And since the temperature of the cooling water in the block side water jacket 10a is maintained at a temperature higher than the cooling water temperature in the head side water jacket 11a, the high temperature cooling water flowing out from the block side water jacket 10a is stored in the heat storage tank. 30 can be stored.

(Other embodiments)
In addition, you may change the said embodiment suitably as follows.
In the above embodiment, after the warm-up of the internal combustion engine is completed, the cooling water flowing out from the block-side water jacket is stored in the heat storage tank through the drive of the heat storage pump. However, it may be stored through the heat storage bypass channel without driving the heat storage tank. In the above embodiment, the cooling water in the heat storage tank is circulated to the block-side water jacket on the condition that the cooling water in the heat storage tank is equal to or higher than the predetermined heat storage temperature Ts when the engine is started. Regardless of the temperature of the cooling water stored in the heat storage tank, the cooling water may be circulated through the block-side water jacket when the engine is started. In the above embodiment, the cooling water circulates only between the heat storage tank and the block side water jacket. However, for example, the cooling water flowing out from the head side water jacket is in the heat storage tank. The structure which flows in directly and is stored may be sufficient. Moreover, the structure which does not have a heat storage water channel may be sufficient as a cooling water channel.

  In each of the above embodiments, the driving of the water pump is started on the condition that the temperature of the cooling water in the head-side water jacket has reached the upper limit temperature at which knocking can be suppressed. However, the driving of the water pump may be started at a temperature where the temperature of the cooling water in the head-side water jacket is lower than the upper limit temperature at which knocking can be suppressed. Further, for example, the water pump may be driven from the start of the engine start so that the cooling water flowing out from the head side water jacket may be supplied to the heater core.

  In each of the above embodiments, the temperature of the cooling water in the head-side water jacket is controlled to the first temperature, and the temperature of the cooling water in the block-side water jacket is controlled to the second temperature. The first temperature is set to an upper limit temperature at which knocking can be suppressed. However, the first temperature may be a temperature lower than the upper limit temperature. Further, the temperature of the cooling water in the head side water jacket and the temperature of the cooling water in the block side water jacket may be controlled to the same temperature as the second temperature.

  In each of the above embodiments, the heater core and the block-side water jacket are connected in series in this order in the main water channel of the cooling water channel, but the heater core is provided by connecting the heater core and the block-side water jacket in parallel. The water channel to be used may be a bypass water channel in which the cooling water bypasses the block-side water jacket.

  In each of the above embodiments, when there is a request for heating the passenger compartment before the engine is warmed up, all the cooling water flowing out from the head-side water jacket bypasses the block-side water jacket. However, before the engine is warmed up, for example, a part of the cooling water flowing out from the head-side water jacket is allowed to flow to the block-side water jacket, and as the heating requirement increases, the amount of cooling water that bypasses the block-side water jacket increases. In this way, the opening degree of the flow rate adjusting valve may be controlled.

  In each of the above embodiments, the flow rate adjustment valve is used as the adjustment means. However, when there is simply a heating request, when control is performed so that the entire amount of cooling water flowing out from the head-side water jacket bypasses the block-side water jacket, the cooling water flows through the block-side water jacket as an adjustment means. Only a valve that switches between a state and a state that blocks the flow may be provided. That is, in such a case, it is not necessary to provide a flow rate adjusting valve, and a three-way valve may be used as this adjusting means. In the above embodiment, the amount of cooling water flowing through the block-side water jacket is set so that the temperature of the cooling water in the head-side water jacket is higher than the temperature of the cooling water in the block-side water jacket after the engine is warmed up. In order to adjust the flow rate, a flow rate adjusting valve is provided, and the flow rate adjusting valve constitutes an adjusting means.

  In each of the above embodiments, the heat utilization part is a heater core that is utilized for heating the passenger compartment. However, the heat utilization unit may utilize the heat of the cooling water that has flowed out of the head-side water jacket in order to heat the others. A plurality of such heat utilization units may be provided. Further, when a plurality of heat utilization parts are provided, the radiator may be omitted when the heat transferred from the cylinder block and the cylinder head can be utilized (heat radiation) only by the heat utilization part. In particular, when the temperature of the cooling water in the block-side water jacket is controlled to be higher than the temperature of the cooling water in the head-side water jacket, the cooling water flows into the cylinder block when flowing through the block-side water jacket. Since the amount of heat transferred from and to can be reduced, the radiator can be reduced in size or omitted.

  DESCRIPTION OF SYMBOLS 1 ... Cooling channel, 2 ... Main channel, 4 ... Bypass channel, 5 ... Thermal storage channel, 6 ... Thermal storage bypass channel, 7 ... Radiator channel, 10 ... Cylinder block, 10a ... Block side water jacket, 11 ... Cylinder head, 11a ... Head side water jacket, 15 ... heater core, 16 ... thermostat, 17 ... water pump, 18 ... three-way valve, 19 ... flow regulating valve, 20 ... radiator, 30 ... heat storage tank, 31 ... heat storage pump, 32 ... check valve , 50: Electronic control unit, 51: Head side water temperature sensor, 52: Block side water temperature sensor, 53 ... Thermal storage water temperature sensor.

Claims (6)

A cooling water passage connected to a water pump, a head side water jacket formed in the cylinder head, a block side water jacket formed in the cylinder block, and a heat utilization part using the temperature of the cooling water; In the cooling apparatus for an internal combustion engine, the cooling water flowing out from the head-side water jacket through driving flows into the block-side water jacket and the heat utilization unit and then flows into the head-side water jacket again.
The cooling water channel is connected to the upstream side and the downstream side of the block-side water jacket so that the cooling water bypasses the block-side water jacket, and among the cooling water flowing out from the head-side water jacket, Adjusting means for adjusting the amount of cooling water that bypasses the block-side water jacket through a bypass water channel,
Before the engine warm-up is completed, the adjusting means is controlled so that the amount of the cooling water that bypasses the block-side water jacket is adjusted according to the use requirement of the cooling water temperature in the heat using section. An internal combustion engine cooling device. The cooling apparatus for an internal combustion engine according to claim 1,
After the warm-up of the engine is completed, the temperature of the cooling water in the head side water jacket becomes the first temperature, and the temperature of the cooling water in the block side water jacket is higher than the first temperature and the boiling point of the cooling water. The adjusting means is controlled so that the amount of the cooling water that bypasses the block-side water jacket through the bypass water passage among the cooling water that has flowed out of the head-side water jacket is adjusted so as to have the following second temperature. A cooling device for an internal combustion engine, characterized in that: The internal combustion engine cooling device according to claim 1 or 2,
The cooling apparatus for an internal combustion engine, wherein the driving of the water pump is started on the condition that the temperature of the cooling water in the head-side water jacket has reached an upper limit temperature at which knocking can be suppressed. The cooling apparatus for an internal combustion engine according to any one of claims 1 to 3,
The cooling water channel is connected to the upstream side of the connection site of the bypass water channel on the upstream side of the block-side water jacket and the upstream side of the connection site of the bypass water channel on the downstream side of the block-side water jacket, and has a high temperature. It has a heat storage water channel in which a heat storage tank for storing cooling water and a heat storage pump are provided,
A cooling device for an internal combustion engine, wherein the cooling water stored in the heat storage tank is circulated to the block-side water jacket through driving of the heat storage pump when the engine is started. The cooling device for an internal combustion engine according to claim 4,
An internal combustion engine characterized in that the cooling water stored in the heat storage tank is circulated to the block-side water jacket on condition that the cooling water stored in the heat storage tank is equal to or higher than a predetermined heat storage temperature. Cooling system. The internal combustion engine cooling device according to claim 4 or 5,
A cooling apparatus for an internal combustion engine, wherein after the engine is warmed up, the cooling water flowing out from the block-side water jacket through the drive of the heat storage pump is stored in the heat storage tank.

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