JP4214890B2 - Engine cooling system - Google Patents

Description

  The present invention relates to an engine cooling apparatus.

  The engine cooling device includes a cooling circuit that circulates a coolant that cools the engine body. The cooling circuit is provided with an inflow passage through which the refrigerant flows into the water jacket of the engine body and an outflow passage through which the refrigerant in the water jacket flows out, so that the refrigerant circulating in the cooling circuit passes through the water jacket. The For this reason, when the engine body is in a high temperature state, the heat of the engine body is taken away by the refrigerant passing through the water jacket, and the temperature rise of the engine body is suppressed.

  The inflow passage and the outflow passage of the cooling circuit are provided, for example, on one side and the other side of the water jacket in the cylinder arrangement direction. By providing the inflow passage and the outflow passage in this way, the refrigerant that has flowed into the water jacket from the inflow passage flows in the cylinder arrangement direction, and after maximally depriving each cylinder, it flows out of the water jacket from the outflow passage. As a result, the engine body can be efficiently cooled by the refrigerant circulating in the cooling circuit.

By the way, although the refrigerant circulating in the cooling circuit rises in temperature due to heat from the engine body or the like, it has been proposed to use the refrigerant thus warmed up for warming up the engine. For example, in Patent Document 1, a refrigerant whose temperature has increased due to heat exchange with an engine body or the like is stored in a heat storage container, and, for example, when the engine is started in a cold state, the refrigerant in the heat storage container is provided for each cylinder of the engine. It is made to flow into a water jacket through the supplied supply path. The refrigerant flowing into the water jacket flows out of the water jacket from the inflow passage and the outflow passage of the cooling circuit after warming the engine body.
JP 2003-3843 A

  However, if the inflow passage and the outflow passage of the cooling circuit are provided on one side and the other side of the water jacket in the cylinder arrangement direction, the warm refrigerant in the heat storage container is caused to flow into the water jacket from the supply passage corresponding to each cylinder. However, it becomes difficult for the warm refrigerant to stay in the water jacket.

  That is, among the cylinders, for cylinders close to the inflow passage and the outflow passage, even if warm refrigerant flows into the water jacket from the supply passage corresponding to the cylinder, the refrigerant immediately flows into the inflow passage and outflow passage. Will flow out to the outside. If the inflow passage and the outflow passage are provided on one side and the other side of the water jacket in the cylinder arrangement direction, the above-described cylinder in which the warm refrigerant immediately flows out of the water jacket is connected between the one side and the other side in the cylinder arrangement direction. It will exist in both sides. This causes the warm refrigerant flowing from the heat storage container to hardly stay in the water jacket.

  And when the warm refrigerant | coolant which flowed in from the heat storage container in the water jacket becomes difficult to stay, heat exchange between the said refrigerant | coolant and an engine main body will not fully be performed, but it becomes difficult to warm up an engine main body. In particular, in a cylinder in which the amount of cooling water flowing into the water jacket from the supply passage is small among the cylinders, the heat exchange cannot be sufficiently performed, and the cooling water inflow amount is further reduced. Deterioration becomes remarkable.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an engine cooling device that can suitably warm up an engine body.

In the following, means for achieving the above object and its effects are described.
In order to achieve the above object, according to the first aspect of the present invention, an inflow passage through which refrigerant flows from one side in the cylinder arrangement direction with respect to the water jacket of the engine body to a cooling circuit in which the refrigerant for cooling the engine body circulates, and An outflow passage for allowing the refrigerant in the water jacket to flow out from the other side in the cylinder arrangement direction is provided, the refrigerant in the cooling circuit is stored in a heat storage container, and the refrigerant in the heat storage container is provided for each cylinder. In the engine cooling apparatus for flowing into the water jacket through the supply passage, the passage is closed in one of the inflow passage and the outflow passage when the refrigerant in the heat storage container flows into the water jacket. An open / close valve was provided.

  When the refrigerant in the heat storage passage flows into the water jacket from each supply passage for warming up the engine body, the on-off valve is closed and the passage provided with the on-off valve is shut off. For this reason, the refrigerant flows out of the water jacket only from the passage where the on-off valve is not provided in the inflow passage and the outflow passage. Therefore, the refrigerant stays in the water jacket for a long time, and sufficient heat exchange is performed between the refrigerant and the engine body, so that warming up of the engine body is promoted. Of the refrigerant flowing into the water jacket from the supply passage corresponding to each cylinder, the refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder close to the passage provided with the opening / closing valve After flowing in the entire arrangement direction, it flows out to the outside. For this reason, the said refrigerant | coolant comes to contribute more about the warming-up of each cylinder of an engine main body, and can warm-up all the cylinders of an engine more suitably.

According to a second aspect of the present invention, in the first aspect of the present invention, the water jacket is provided on a cylinder head of an engine.
In an engine in which fuel injection is performed toward the intake port of the cylinder head, when the intake port wall surface of the cylinder head is in a cold state, the injected fuel is liable to adhere to the intake port wall surface without being vaporized, Affects emissions, fuel consumption, and startability. For this reason, when warming up the engine, it is important to raise the temperature of the intake port wall surface of the cylinder head. However, according to the above configuration, the intake port wall surface of the cylinder head can be suitably heated.

  In the invention of claim 3, in the invention of claim 2, the engine causes the refrigerant to flow in and out of the water jacket provided in the cylinder block of the engine via the water jacket of the cylinder head, The on-off valve is provided in the outflow passage.

  In the engine as described above, a plurality of communication passages that connect the water jacket of the cylinder head and the water jacket of the cylinder block are provided in the cylinder arrangement direction, and the flow passage area of the communication passage closer to the inflow passage among these communication passages. Is made larger than other communication paths. In this way, the flow passage area of each communication path is set when the engine body is cooled by the refrigerant circulating in the cooling circuit during the engine operation after the completion of warm-up, and flows into the water jacket of the cylinder head from the inflow path. This is because an amount of the refrigerant necessary for cooling the cylinder block flows to the water jacket of the cylinder block via each communication path. That is, by increasing the flow path area of the communication passage near the inflow passage, the amount of refrigerant flowing from the water jacket of the cylinder head to the water jacket of the cylinder block can be increased, and the amount of refrigerant flowing into the cylinder jacket can be increased. The value is necessary for cooling the block.

  However, when the refrigerant in the heat storage passage flows into the water jacket of the cylinder head through the supply passages, the refrigerant flows from the water jacket to the water jacket of the cylinder block through the communication passages, and the water jacket of the cylinder head. It becomes difficult to stay inside. For this reason, the effect of suitably warming the intake port wall surface of the cylinder head is reduced. Of the communication passages, those on the inflow passage side have a larger flow area than the other communication passages as described above, so that the amount of refrigerant flowing from the cylinder head side to the cylinder block side is larger than the other communication passages. Become.

According to the above configuration, the on-off valve is provided in the outflow passage in order to suppress the reduction of the effect of suitably warming the intake port wall surface of the cylinder head as much as possible.
Assuming that an on-off valve is provided in the inflow passage, when the refrigerant flows from the heat storage container into the water jacket of the cylinder head, the refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder close to the inflow passage To flow toward the outflow passage. When the refrigerant tries to flow in this direction, the refrigerant first tries to pass through the vicinity of the communication path near the inflow path having a large flow path area, and therefore flows through the communication path to the water jacket of the cylinder block. The flow rate of the refrigerant increases. As a result, the amount of refrigerant flowing from the water jacket of the cylinder head into the water jacket of the cylinder block is increased, and the amount of refrigerant remaining in the water jacket of the cylinder head is reduced, which effectively warms the intake port wall surface of the cylinder head. Will be greatly reduced.

  In contrast, according to the above configuration in which the on-off valve is provided in the outflow passage, when the refrigerant flows from the heat storage container into the water jacket of the cylinder head, it flows into the water jacket of the cylinder head from the supply passage corresponding to the cylinder close to the outflow passage. The refrigerated refrigerant tends to flow in the water jacket toward the inflow passage. When the refrigerant is about to flow in this direction, the refrigerant first tries to pass through the vicinity of the communication path near the outflow passage with a small flow path area, and finally passes through the vicinity of the communication path near the inflow passage with a large flow area. Since it is going to pass through, the flow rate of the refrigerant flowing through the water jacket of the cylinder block via the communication path can be suppressed as compared with the case where the on-off valve is provided in the inflow path. As a result, the amount of refrigerant flowing from the water jacket of the cylinder head into the water jacket of the cylinder block is reduced, and the amount of refrigerant remaining in the water jacket of the cylinder head can be suppressed. It can warm up effectively.

Hereinafter, an embodiment in which the present invention is embodied in a V-type eight-cylinder automobile engine cooling apparatus will be described with reference to FIGS.
In the engine 1 shown in FIG. 1, the first cylinder # 1, the third cylinder # 3, the fifth cylinder # 5, and the seventh cylinder # 7 are provided in one bank 1a in a row, and the other In the bank 1b, the second cylinder # 2, the fourth cylinder # 4, the sixth cylinder # 6, and the eighth cylinder # 8 are provided in a row. The cylinder heads 2 and the cylinder blocks 3 of these banks 1a and 1b are cooled by cooling water circulating in the cooling circuit R of the cooling device of the engine 1. Since the bank 1a and the bank 1b have the same configuration, the bank 1a will be described in detail below.

  In the cooling circuit R, a water pump 6 driven by the engine 1 and an inflow passage through which cooling water discharged from the water pump 6 flows from one side (right side in the figure) of the water jacket 4 of the cylinder head 2 in the cylinder arrangement direction. 7 and an outflow passage 8 through which the cooling water in the water jacket 4 flows out from the other side in the cylinder arrangement direction (left side in the figure). Further, the cooling circuit R includes a radiator 12 that lowers the temperature of the circulating cooling water by heat exchange with the outside air, a bypass passage 9 that bypasses the radiator 12, and cooling water to the radiator 12 according to the temperature of the cooling water. A thermostat 10 for prohibiting / permitting inflow is provided.

  Then, the cooling water circulating in the cooling circuit R flows into the water jacket 4 of the cylinder head 2 through the inflow passage 7 as shown by the arrow A, and the cylinder arrangement is arranged in the water jacket 4 as shown in FIG. After flowing in the direction (right to left in the figure) and taking heat from each cylinder, it flows out of the water jacket 4 from the outflow passage 8. Further, the cooling water that has flowed into the water jacket 4 of the cylinder head 2 from the inflow passage 7 flows to the water jacket 5 of the cylinder block 3 through a plurality of communication passages 11 provided in the cylinder arrangement direction. Among these communication passages 11, the flow passage area of the communication passage 11 near the inflow passage 7, for example, the communication passage 11 corresponding to the seventh cylinder # 7 is made larger than that of the other communication passages 11.

  In this way, the flow passage area of each communication passage 11 is set because the amount of cooling water necessary for cooling the cylinder block 3 among the cooling water flowing into the water jacket 5 of the cylinder head 2 from the inflow passage 7 is different. This is to allow the water to flow to the water jacket 5 of the cylinder block 3 through the communication path 11. That is, by increasing the flow passage area of the communication passage 11 near the inflow passage 7, among the cooling water immediately after flowing into the water jacket 4 from the inflow passage 7, the cooling water flowing to the water jacket 5 of the cylinder block 3. The ratio of increases. In this way, the amount of cooling water flowing from the water jacket 5 of the cylinder head 2 to the water jacket 5 to the cylinder block 3 is increased to a value necessary for cooling the cylinder block 3. The cooling water flowing into the water jacket 5 of the cylinder block 3 from each communication passage 11 flows in the cylinder arrangement direction and takes heat from each cylinder, and then passes through the communication passage 11 near the outflow passage and then the water jacket of the cylinder head 2. 4 flows out into the outflow passage 8.

  The cooling device for the engine 1 is provided with a heat storage circuit H for using the high-temperature cooling water in the cooling circuit R to warm up the engine 1 at the next engine start. The heat storage circuit H includes an electric pump 13 that pumps the cooling water in the circuit H, a heat storage container 14 that retains and stores the cooling water, and a water jacket 4 of the cylinder head 2 that stores the cooling water in the heat storage container 14. And a distribution passage 16 for feeding toward the vehicle. A supply passage 15 provided for each cylinder is connected to the distribution passage 16, and the supply passage 15 communicates a portion corresponding to each cylinder of the water jacket 4 with the distribution passage 16.

  When the temperature of the cooling water in the cooling circuit R is high, the cooling water is drawn into the heat storage circuit H by driving the electric pump 13 and is stored in a state of being kept warm in the heat storage container 14. For example, when the engine is started, the cooling water stored in the heat storage container 14 is flowed to the distribution passages 16 by the drive of the electric pump 13 and distributed to the respective supply passages 15, and the water jacket 4 of the cylinder head 2 is supplied via these supply passages 15. Inflow. As for the warm cooling water flowing into the water jacket 4, portions corresponding to the respective cylinders of the cylinder head 2 are warmed, and a part thereof flows into the water jacket 5 of the cylinder block 3 through the communication path 11 to enter the cylinder block 3. To warm up.

Here, the outflow position of the cooling water from the supply passage 15 into the water jacket 4 will be described with reference to FIG.
FIG. 3 is an enlarged cross-sectional view of the cylinder head 2. In the cylinder head 2, an intake passage 22 and an exhaust passage 23 connected to the combustion chamber 21 of the engine 1 are provided, and the water jacket 4 is formed around the combustion chamber 21, the intake passage 22, and the exhaust passage 23. ing. The intake passage 22 is provided with a fuel injection valve 24 that injects fuel toward the intake port 22 a of the combustion chamber 21.

  The outflow position of the cooling water into the water jacket 4 in the supply passage 15 is set in the vicinity of the intake port 22a. By performing such setting, when the warm cooling water in the heat storage container 14 is caused to flow into the portions corresponding to the respective cylinders of the water jacket 4 through the respective supply passages 15, the introduced cooling water is first supplied to the cylinder head 2. Since it contacts near the intake port 22a, the wall surface of the intake port 22a can be effectively warmed. Therefore, even if the fuel injected from the fuel injection valve 24 adheres to the wall surface of the intake port 22a, the fuel is easily vaporized, and the emission, fuel consumption, and startability due to the liquid fuel adhering to the wall surface are reduced. Adverse effects can be suppressed.

  By the way, in the cooling device of the engine 1, when the cooling water in the heat storage container 14 flows into the water jacket 4 into the outflow passage 8 of the cooling circuit R shown in FIG. 1, the cooling from the water jacket 4 to the outflow passage 8 is performed. An open / close valve 17 is provided to close the passage 8 so as to inhibit the outflow of water. By providing such an on-off valve 17, the engine 1 can be warmed up suitably. Hereinafter, the difference in warm-up performance of the engine 1 between when the on-off valve 17 is provided and when it is not provided will be described.

  If the on-off valve 17 is not provided, when the cooling water in the heat storage container 14 flows into the water jacket 4 from each supply passage 15, the cooling water that has flowed into the water jacket 4 flows in as shown in FIG. It becomes possible to flow out from both the passage 7 and the outflow passage 8. The inflow passage 7 and the outflow passage 8 are respectively provided on one side (right side in the figure) and the other side (left side in the figure) of the water jacket 4 in the cylinder arrangement direction. Therefore, for the first cylinder # 1 and the third cylinder # 3 located near the inflow passage 7, the cooling water that has flowed into the water jacket 4 from the supply passage 15 corresponding to those cylinders is directed toward the outflow passage 8. Flowing. Further, for the fifth cylinder # 5 and the seventh cylinder # 7 located near the outflow passage 8, the cooling water flowing into the water jacket 4 from the supply passage 15 corresponding to those cylinders flows toward the inflow passage 7. .

  Among the cylinders, the closest cylinder # 1 closest to the outflow passage 8 receives the cooling water flowing into the water jacket 4 from the supply passage 15 corresponding to the cylinder # 1. It immediately flows out from the outflow passage 8 to the outside. For the seventh cylinder # 7 closest to the inflow passage 7, even if warm cooling water flows into the water jacket 4 from the supply passage 15 corresponding to the cylinder # 7, the cooling water immediately flows in. It will flow out of the passage 7 to the outside. As described above, when the inflow passage 7 and the outflow passage 8 are provided on one side and the other side of the water jacket 4 in the cylinder arrangement direction, the cylinders in which the above-described warm refrigerant immediately flows out of the water jacket 4 are arranged in the cylinder arrangement direction. It exists on both one side and the other side. This makes it difficult for the warm cooling water from the heat storage container 14 to stay in the water jacket 4.

  If the warm cooling water from the heat storage container 14 is less likely to stay in the water jacket 4, heat exchange between the cooling water and the cylinder head 2 is not sufficiently performed, and it is difficult to warm up the cylinder head 2. Further, the temperature of the wall surface of the intake port 22a of each cylinder is also difficult to rise. In particular, among the cylinders, in a cylinder having a small flow rate of the cooling water flowing into the water jacket 4 from the supply passage 15, the heat exchange cannot be sufficiently performed, so that the warm-up performance is remarkable.

  Here, FIG. 6 shows how the temperature of the wall surface of the intake port 22a of each cylinder changes as the cooling water in the heat storage container 14 flows into the water jacket 4 when the on-off valve 17 is not provided.

  As can be seen from the figure, the temperature of the wall surface of the intake port 22a of each cylinder is the first cylinder # 1, the third cylinder # 3, the fifth cylinder as the cooling water flows from the heat storage container 14 into the water jacket 4. The rising starts in the order of # 5 and # 7 cylinder # 7. This is because the flow path length of the cooling water from the heat storage container 14 to the supply passage 15 of each cylinder becomes longer in the order of the cylinders (see FIG. 1). Then, the temperature of the wall surface of the intake port 22a of each cylinder rises until the warm cooling water in the heat storage container 14 disappears and the cooling water inflow is stopped. In this process, the peak value of the temperature of the wall surface of the intake port 22a in each cylinder takes a smaller value in the order of the cylinders. This is because the flow resistance of the cooling water becomes larger in the seventh cylinder # 7 having a longer flow length of the cooling water from the heat storage container 14 to the supply passage 15 of each cylinder and flows into the water jacket 4 from the supply passage 15. This is because the flow rate of the cooling water is reduced.

  Accordingly, among the intake ports 22a of each cylinder, some of the cylinders close to the seventh cylinder # 7 have the same temperature when the fuel injected from the fuel injection valve 24 adheres to the wall surface of the intake port 22a. The target value, which is the minimum temperature at which the fuel can be vaporized, will not be reached (in this case, only the seventh cylinder # 7). In the cylinder where the temperature of the wall surface of the intake port 22a does not reach the target value, the injected fuel from the fuel injection valve 24 adheres to the wall surface of the intake port 22a in a liquid state, and the liquid fuel is emitted from the engine 1 and the fuel consumption is reduced. And startability will be adversely affected.

  In contrast, when the on-off valve 17 described above is provided in the outflow passage 8, when the cooling water in the heat storage container 14 flows into the water jacket 4 from each supply passage 15, the on-off valve 17 is closed and the outflow passage 8 is shut off. In this state, the cooling water outflow from the water jacket 4 through the outflow passage 8 is prohibited. For this reason, the outflow of the cooling water to the outside of the water jacket 4 is performed only from the inflow passage 7 where the on-off valve 17 is not provided, as shown in FIG. Accordingly, the cooling water stays in the water jacket 4 for a long time, and sufficient heat exchange is performed between the cooling water and the cylinder head 2, so that the warm-up of the cylinder head 2 is promoted.

  Of the supply passages 15 corresponding to each cylinder, the cooling water flowing into the water jacket 4 from the supply passage 15 corresponding to the cylinder # 1 closest to the outflow passage 8 provided with the opening / closing valve 17 is After flowing in the water jacket 4 from the first cylinder # 1 to the seventh cylinder # 7 in the entire cylinder arrangement direction, it flows out of the water jacket 4 through the inflow passage 7. For this reason, the cooling water contributes more to the warming up of the portion corresponding to each cylinder of the cylinder head 2, and the warming up of the cylinder head 2 can be performed more suitably. Further, the temperature rise of the wall surface of the intake port 22a of the cylinder head 2 is also suitably performed, and when the injected fuel from the fuel injection valve 24 adheres to the wall surface of the intake port 22a, it is easily vaporized.

Here, when the on-off valve 17 is provided, how the wall surface of the intake port 22a of each cylinder changes with the inflow of the heat storage container 14 into the water jacket 4 is shown in FIG.
As can be seen from the figure, the temperature of the wall surface of the intake port 22a of each cylinder is higher than the target value in any cylinder. In particular, as the cylinder closer to the seventh cylinder # 1, the peak value of the temperature of the wall surface of the intake port 22a takes a higher value than when the on-off valve 17 is not provided (FIG. 6). This is because when the on-off valve 17 is not provided, the cooling water flowing into the water jacket 4 from the supply passage 15 corresponding to the first cylinder # 1 immediately flows out from the outflow passage 8, whereas the on-off valve This is because the provision of the coolant 17 further contributes to increasing the temperature of the wall surface of the intake port 22a of the second cylinder # 2, the fifth cylinder # 1, and the seventh cylinder # 7.

  As described above, since the temperature of the wall surface of the intake port 22a reaches the target value in any cylinder, the adhesion of liquid fuel to the wall surface of the intake port 22a during fuel injection from the fuel injection valve 24 is suppressed. It is possible to suppress adverse effects on the emission, fuel consumption, and startability due to the adhesion of the liquid fuel.

  The on-off valve 17 can be provided in the inflow passage 7 instead of being provided in the outflow passage 8. In this case, when the cooling water in the heat storage container 14 is caused to flow into the water jacket 4 from each supply passage 15, the on-off valve 17 is closed and the inflow passage 7 is shut off, and the inflow passage 7 is opened from within the water jacket 4. Cooling water outflow is prohibited. For this reason, the outflow of the cooling water to the outside of the water jacket 4 is performed only from the inflow passage 7 where the on-off valve 17 is not provided as shown in FIG. 5, and the cooling water stays in the water jacket 4 for a long time. Therefore, the substantially same effect as that obtained when the on-off valve 17 is provided in the outflow passage 8 can be obtained.

  However, when the cooling water of the heat storage container 14 is caused to flow into the water jacket 4 from each supply passage 15, a part of the cooling water flows out from the water jacket 4 to the water jacket 4 of the cylinder block 3 via each communication passage 11. However, if the on-off valve 17 is provided in the inflow passage 7, the outflow amount of the cooling water increases. That is, when the on-off valve 17 is provided in the inflow passage 7, the cooling that has flowed into the water jacket 4 from the supply passage 15 corresponding to the seventh cylinder # 7 closest to the inflow passage 7 among the supply passages 15 corresponding to each cylinder. Water flows in the water jacket 4 from the seventh cylinder # 7 to the first cylinder # 1. When the cooling water is about to flow in this direction, the cooling water first tries to pass through the vicinity of the communication path 11 near the inflow path 7 having a large flow path area. The flow rate of the cooling water flowing through the water jacket 5 of the block 3 increases. As a result, the total flow rate of the cooling water flowing from the water jacket 4 to the water jacket 5 via the communication passages 11 increases.

  As described above, when the total flow rate of the cooling water flowing from the water jacket 4 of the cylinder head 2 to the water jacket 5 of the cylinder block 3 is increased, the amount of cooling water remaining in the water jacket 4 is reduced. The effect of suitably warming is reduced.

  In order to suppress the reduction of this effect as much as possible, it is preferable to provide the on-off valve 17 in the outflow passage 8. That is, when the on-off valve 17 is provided in the outflow passage 8, when cooling water flows from the heat storage container 14 into the water jacket 4 of the cylinder head 2, the supply passage 15 corresponding to the cylinder # 1 closest to the outflow passage 8 is provided. The cooling water flowing into the water jacket 4 flows through the water jacket 4 from the first cylinder # 1 to the seventh cylinder # 7. When the cooling water is about to flow in this direction, the cooling water first tries to pass through the vicinity of the communication passage 11 near the outflow passage 8 having a small flow path area, and finally close to the inflow passage 7 having a large flow area. Trying to pass through the vicinity of the communication path 11. From this, the flow rate of the cooling water flowing through the water jacket 5 of the cylinder block 3 through the communication passage 11 near the inflow passage 7 is suppressed to be smaller than when the on-off valve 17 is provided in the inflow passage 7. As a result, the total flow rate of the cooling water flowing from the water jacket 4 to the water jacket 5 via the communication paths 11 is reduced.

  Therefore, by providing the on-off valve 17 in the outflow passage 8, it is possible to suppress a decrease in the amount of cooling water remaining in the water jacket 4 when the cooling water in the heat storage container 14 flows into the water jacket 4. The wall surface of the intake port 22a can be suitably warmed.

According to the embodiment described in detail above, the following effects can be obtained.
(1) When the on-off valve 17 is provided in the outflow passage 8 and the cooling water of the heat storage container 14 is caused to flow into the water jacket 4 of the cylinder head 2 through the supply passage 15 corresponding to each cylinder, the on-off valve 17 is closed. The cooling water that has flowed into the water jacket 4 flows out only from the inflow passage 7. For this reason, the cooling water stays in the water jacket 4 for a long time, and heat exchange between the cooling water and the cylinder head 2 is sufficiently performed, so that warming up of the cylinder head 2 can be promoted. Further, with respect to the cooling water flowing into the water jacket 4 from the supply passage 15 corresponding to the closest cylinder # 1 closest to the outflow passage 8, the inside of the water jacket 4 is changed from the first cylinder # 1 to the seventh cylinder # 7. After flowing in the arrangement direction, it flows out of the water jacket 4 through the inflow passage 7. For this reason, the cooling water contributes more to the warming up of the portion corresponding to each cylinder of the cylinder head 2, and the warming up of the cylinder head 2 can be performed more suitably.

  (2) In the engine 1 that injects fuel from the fuel injection valve 24 toward the intake port 22a, it is important to raise the temperature of the wall surface in order to prevent liquid fuel from adhering to the wall surface of the intake port 22a. become. Cooling water from the heat storage container 14 flows into the water jacket 4 of the cylinder head 2 provided with the intake port 22a through each supply passage 15. Specifically, the outflow position of the cooling water to the water jacket 4 in the supply passage 15 is set in the vicinity of the intake port 22a, and the cooling water flows into the vicinity of the intake port 22a in the water jacket 4. Accordingly, the wall surface of the intake port 22a is suitably warmed by the cooling water, and the fuel easily vaporizes when the injected fuel from the fuel injection valve 24 adheres to the wall surface of the intake port 22a. It is possible to suppress adverse effects on the emission, fuel consumption, and startability due to the adhesion of the fuel.

  (3) When the on-off valve 17 is provided in the outflow passage 8, when cooling water flows from the heat storage container 14 into the water jacket 4 of the cylinder head 2, the cylinder block 3 is connected to the water jacket 4 through the communication passages 11. The flow rate of the cooling water flowing out to the water jacket 5 is reduced as compared with the case where the on-off valve 17 is provided in the inflow passage 7. Therefore, by providing the opening / closing valve 17 in the outflow passage 8, the amount of cooling water staying in the water jacket 4 of the cylinder head 2 is increased by the amount of the cooling water being reduced, and the wall surface of the intake port 22a in the cylinder head 2 is further increased. It becomes possible to warm effectively.

  (4) When the on-off valve 17 is provided in the outflow passage 8, when cooling water flows from the heat storage container 14 into the water jacket 4 of the cylinder head 2, the cooling water flows in as shown by an arrow B in FIG. It flows out of the water jacket 4 through the passage 7. For this reason, when the water pump 6 starts to be driven by the subsequent engine operation, the relatively warm cooling water that has flowed out of the water jacket 4 remains in the inflow passage 7, and this cooling water again passes from the inflow passage 7 to the water jacket. Returning to 4, the engine 1 is warmed. Therefore, the engine 1 can be warmed more effectively.

  Although the bank 1a has been described in detail so far, the bank 1b having the same configuration as that of the bank 1a can obtain the same effect as that produced by the bank 1a.

[Other Embodiments]
The said embodiment can also be changed as follows, for example.
In the above embodiment, the flow length from the heat storage container 14 to the supply passage 15 of each cylinder becomes longer in the order of the first cylinder # 1, the third cylinder # 3, the fifth cylinder # 5, and the seventh cylinder # 7. Although the heat storage circuit H is configured as described above, the present invention is not limited to this. That is, the heat storage circuit H may be configured such that the flow path length from the heat storage container 14 to the supply passage 15 of each cylinder increases in an order different from the above order.

  Although the present invention is applied to the V-type eight-cylinder engine 1, the present invention may be applied to other types of engines such as an in-line four-cylinder and a V-type six-cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the whole cooling device of the engine in this embodiment. The schematic diagram which shows the passage aspect inside the engine of the cooling water which circulates through a cooling circuit at the time of engine operation. The expanded sectional view which shows the internal structure of the cylinder head in the said engine. The schematic diagram which shows the passage aspect of the cooling water in an engine when a cooling water is poured into the water jacket of an engine from the thermal storage container in the state which does not provide the on-off valve. The schematic diagram which shows the passage aspect of the cooling water in an engine when a cooling water is poured from the thermal storage container to the water jacket of an engine in the state which provided the on-off valve in the inflow passage. The graph which shows how the temperature of the intake port wall surface of each cylinder changes, when a cooling water is poured from the thermal storage container to the water jacket of an engine in the state which does not provide the on-off valve. The graph which shows how the temperature of the intake port wall surface of each cylinder changes, when a cooling water is poured from the thermal storage container to the water jacket of an engine in the state which provided the on-off valve in the outflow passage.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine, 1a ... Bank, 1b ... Bank, 2 ... Cylinder head (engine main body), 3 ... Cylinder block (engine main body), 4 ... Water jacket, 5 ... Water jacket, 6 ... Water pump, 7 ... Inflow passage, 8 ... Outflow passage, 9 ... Bypass passage, 10 ... Thermostat, 11 ... Communication passage, 12 ... Radiator, 13 ... Electric pump, 14 ... Heat storage container, 15 ... Supply passage, 16 ... Distribution passage, 17 ... Open / close valve, 21 ... Combustion chamber, 22 ... intake passage, 22a ... intake port, 23 ... exhaust passage, 24 ... fuel injection valve.

Claims (3)

An inflow passage through which refrigerant flows from one side in the cylinder arrangement direction to the water jacket of the engine body and a refrigerant in the water jacket flows out from the other side in the cylinder arrangement direction to a cooling circuit in which refrigerant for cooling the engine body circulates. An engine cooling device provided with an outflow passage, which retains and stores the refrigerant in the cooling circuit in a heat storage container, and causes the refrigerant in the heat storage container to flow into the water jacket through a supply passage provided for each cylinder. In
An engine cooling device, wherein either one of the inflow passage and the outflow passage is provided with an on-off valve that closes the passage when the refrigerant in the heat storage container flows into the water jacket. The engine cooling apparatus according to claim 1, wherein the water jacket is provided in a cylinder head of the engine. 3. The engine according to claim 2, wherein the engine allows refrigerant to flow into and out of a water jacket provided in a cylinder block of the engine via a water jacket of the cylinder head, and the on-off valve is provided in the outflow passage. Cooling system.

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