JP2005133692A - Engine cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress occurrence of unevenness in warming-up property among a plurality of suction ports due to worsening of warming-up property of suction ports close to a flow-in passage and a flow-out passage in cylinders closest to the passages and suppress reduction of improvement effect of emission and fuel economy. <P>SOLUTION: In the cylinder closest to the flow-out passage 8, a flow-out position of cooling water to a water jacket 5 in a supply passage 15 is eccentric by predetermined amount a1 onto a suction port 22b side remote from the flow-out passage 8. For this reason, cooling water entering the water jacket 5 fom the supply passage 15 remains easily around the suction port 22a close to the flow-out passage 8 in No.1 cylinder. In No.7 cylinder closest to the flow-in passage 7, the flow-out position is eccentric by predetermined amount a7 onto a suction port 22a side remote from the flow-in passage 7. For this reason, cooling water entering the water jacket 5 from the supply passage 15 remains easily around the suction port 22b close to the flow-in passage 7 in No.7 cylinder. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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 cylinder head 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. . By providing such a cooling circuit, when the engine body is in a high temperature state, the heat of the engine body such as the cylinder head is taken away by the refrigerant circulating in the cooling passage, 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 takes the maximum amount of heat from the portion corresponding to each cylinder in the cylinder head. It flows out of the water jacket from the outflow passage. As a result, the cylinder head 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 been increased by heat exchange with an engine body or the like is stored in a heat storage container, and for example, a refrigerant in the heat storage container is provided for each cylinder of the engine when the engine is started in a cold state. It is made to flow into the water jacket of the cylinder head through the supplied supply passage. Then, the cylinder head is warmed by the refrigerant flowing into the water jacket from each supply passage and the vaporization of the injected fuel is promoted, so that the emission and fuel consumption of the engine are improved.

As shown in Patent Document 1, in an engine in which a plurality of (specifically, two) intake ports are provided for one cylinder, when fuel is injected toward the intake ports, heat storage is performed. When the refrigerant in the container is caused to flow into the water jacket of the cylinder head, it is preferable that the wall surface of each intake port is evenly warmed by the refrigerant. This is because if the temperature rise of the wall surface of one intake port does not advance and the warm-up performance varies among the intake ports, the vaporization of the injected fuel attached to the wall surface is difficult to proceed at the one intake port. This is because the effect of improving the engine emission, fuel consumption, and the like by reducing the amount of refrigerant stored in the heat storage container into the water jacket is reduced.
JP 2003-3843 A

  However, as disclosed in Patent Document 1, if the outflow position of the refrigerant into the water jacket of the supply passage of each cylinder is set to the same position in each cylinder, each intake air in the cylinder close to the inflow passage and the outflow passage is set. It becomes difficult to warm the wall of the port evenly. This is because 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, and when the refrigerant flows into the water jacket from the supply passage corresponding to each cylinder, This is because the refrigerant is likely to flow out from the inflow passage to the outside in the closest cylinder, and the refrigerant is likely to flow out from the outflow passage in the cylinder closest to the outflow passage.

  That is, in the cylinder closest to the inflow passage, the refrigerant hardly stays around the intake port close to the inflow passage, so that the warm-up performance is worse in the intake port close to the inflow passage compared to the intake port far from the passage. Further, in the cylinder closest to the outflow passage, the refrigerant is unlikely to accumulate around the intake port close to the outflow passage, so that the warm-up performance is worse in the intake port near the outflow passage than in the far intake port. For this reason, in the cylinder closest to the inflow passage and the cylinder closest to the outflow passage, it becomes difficult to uniformly warm the wall surface of each intake port, and the warm-up performance varies among the intake ports.

  As described above, in the cylinder closest to the inflow passage and the outflow passage, when the warm-up property varies among the plurality of intake ports, the temperature rise of the wall surface is difficult to proceed at the intake port with poor warm-up property. It becomes difficult for the injected fuel adhering to the wall surface to advance. Then, as described above, the effect of improving the emission and fuel consumption and the like caused by flowing the refrigerant in the heat storage container into the water jacket is reduced accordingly.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a plurality of intake ports in a cylinder closest to the inflow passage and the outflow passage due to deterioration in warm-up performance of the intake ports close to the passages. It is an object of the present invention to provide an engine cooling device that can suppress the variation in warm-up performance between the two and suppress the reduction in the improvement effects such as emission and fuel consumption.

In the following, means for achieving the above object and its effects are described.
In order to achieve the above object, the invention according to claim 1 is applied to a multi-cylinder engine having a plurality of intake ports in one cylinder, and a water jacket for a cylinder head is provided in a cooling circuit in which a refrigerant for cooling the engine body circulates. An inflow passage through which the refrigerant flows in and an outflow passage through which the refrigerant in the water jacket flows out are provided, the refrigerant in the cooling circuit is stored in a heat storage container, and the refrigerant in the heat storage container is stored for each cylinder. In the engine cooling device for flowing into the water jacket through the provided supply passage, in the cylinder closest to the inflow passage, the refrigerant outflow position into the water jacket in the supply passage is determined by the cylinder bore of the cylinder. In a cylinder that is shifted from the inflow passage in a direction away from the inflow passage and is closest to the outflow passage, the supply passage The outflow position of the refrigerant in said water jacket, and a position displaced in a direction away from the outlet passage to the center of the cylinder bore of the cylinder.

  In the cylinder closest to the inflow passage, the refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder is likely to flow to the inflow passage side. The refrigerant does not easily stay around the port. However, since the outflow position of the refrigerant to the water jacket of the supply passage is shifted in a direction away from the inflow passage with respect to the center of the cylinder bore, the refrigerant easily stays around the intake port near the inflow passage. It can suppress that the warming-up property of the said intake port deteriorates. Therefore, it is possible to prevent the warm-up property at the intake port from deteriorating and variations in the warm-up property between the intake ports, and to reduce the warm-up property at the intake port to the water jacket with the cooling water in the heat storage container. It can suppress that the improvement effect, such as the emission by warming and warming-up, falls. Further, in the cylinder closest to the outflow passage, the refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder easily flows to the outflow passage side, so that the closer to the outflow passage among the plurality of intake ports of the cylinder. The refrigerant is less likely to stay around the intake port. However, since the outflow position of the refrigerant to the water jacket of the supply passage is a position shifted in the direction away from the outflow passage with respect to the center of the cylinder bore, the refrigerant easily stays around the intake port near the outflow passage. It can suppress that the warming-up property of the said intake port deteriorates. Therefore, it is possible to prevent the warm-up property at the intake port from deteriorating and variations in the warm-up property between the intake ports, and to reduce the warm-up property at the intake port to the water jacket with the cooling water in the heat storage container. It can suppress that the improvement effect, such as the emission by warming and warming-up, falls.

  According to a second aspect of the present invention, in the first aspect of the invention, among the cylinders located closer to the inflow passage, even in the cylinder closer to the outflow passage than the cylinder closest to the passage, the water in the supply passage is provided. The refrigerant outflow position into the jacket is shifted to the direction away from the inflow passage with respect to the center of the cylinder bore of the cylinder, and among the cylinders located closer to the outflow passage, than the cylinder closest to the passage Even in the cylinder near the inflow passage, the outflow position of the refrigerant in the water jacket of the supply passage is shifted from the center of the cylinder bore of the cylinder in a direction away from the outflow passage.

  Among the cylinders located closer to the inflow passage, in the cylinder closer to the outflow passage than the cylinder closest to the passage, as in the cylinder closest to the inflow passage, the closer to the inflow passage among the plurality of intake ports, The refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder is less likely to stay. However, since the outflow position of the refrigerant to the water jacket of the supply passage is shifted in a direction away from the inflow passage with respect to the center of the cylinder bore, the refrigerant easily stays around the intake port near the inflow passage. It is possible to suppress deterioration in warm-up performance at the intake port. Also, among the cylinders located near the outflow passage, the cylinders closer to the inflow passage than the cylinder closest to the outflow passage are also located closer to the outflow passage among the plurality of intake ports as in the cylinder closest to the outflow passage. The refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder is less likely to stay. However, since the outflow position of the refrigerant to the water jacket of the supply passage is shifted in a direction away from the outflow passage with respect to the center of the cylinder bore, the refrigerant easily stays around the intake port near the inflow passage. It is possible to suppress deterioration in warm-up performance at the intake port.

  According to a third aspect of the present invention, in the second aspect of the invention, the outflow position of the supply passage in a cylinder closer to the outflow passage than the cylinder closest to the inflow passage among the cylinders located closer to the inflow passage. Of the cylinder bore is made smaller than the displacement amount of the outflow position of the supply passage in the cylinder closest to the inflow passage with respect to the center of the cylinder bore, and among the cylinders located near the outflow passage, The amount of deviation of the outflow position of the supply passage in the cylinder closer to the inflow passage than the cylinder closest to the passage with respect to the center of the cylinder bore is the cylinder bore at the outflow position of the supply passage in the cylinder closest to the outflow passage. It was smaller than the amount of deviation from the center.

  Of the cylinders positioned closer to the inflow passage, for the cylinder closer to the outflow passage than the cylinder closest to the passage, the refrigerant flowing into the water jacket is less likely to flow to the inflow passage side than the cylinder closest to the inflow passage. . Considering this, for cylinders closer to the outflow passage than the cylinder closest to the inflow passage, the displacement of the refrigerant outflow position to the water jacket of the supply passage relative to the center of the cylinder bore is smaller than the cylinder closest to the inflow passage. The amount has been reduced. Therefore, in the cylinder closer to the outflow passage than the cylinder closest to the inflow passage, it is possible to prevent the deviation amount from becoming excessively large while accurately suppressing the deterioration in warm-up performance at the intake port near the inflow passage. it can. Also, among the cylinders located near the outflow passage, for the cylinder closer to the inflow passage than the cylinder closest to the passage, the refrigerant flowing into the water jacket flows to the outflow passage side from the cylinder nearest to the outflow passage. It becomes difficult. Considering this, for cylinders closer to the inflow passage than cylinders closest to the outflow passage, the displacement of the refrigerant outflow position to the water jacket of the supply passage relative to the center of the cylinder bore is smaller than the cylinder closest to the outflow passage. The amount has been reduced. Therefore, in the cylinder closer to the inflow passage than the cylinder closest to the outflow passage, it is possible to accurately suppress the deterioration in warm-up at the intake port near the outflow passage and to suppress the deviation from becoming excessively large. it can.

  According to a fourth aspect of the present invention, an inflow is applied to a multi-cylinder engine having two intake ports in one cylinder, and the refrigerant flows into the water jacket of the cylinder head in a cooling circuit in which the refrigerant for cooling the engine body circulates. A passage and an outflow passage for allowing the refrigerant in the water jacket to flow out are provided, the refrigerant in the cooling circuit is stored in a heat storage container, and the refrigerant in the heat storage container is supplied via a supply passage provided for each cylinder. In the cooling device for the engine that flows into the water jacket, in the cylinder closest to the inflow passage, the outflow position of the refrigerant to the water jacket in the supply passage is biased toward the intake port far from the inflow passage, In the cylinder closest to the outflow passage, the refrigerant outflow position to the water jacket in the supply passage is set to the outflow passage. It was biased in distant intake port side.

  In the cylinder closest to the inflow passage, the refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder easily flows to the inflow passage side. Therefore, the intake port near the inflow passage in the cylinder has an intake air far from the inflow passage. The refrigerant is less likely to stay around the port as compared to the port. However, since the refrigerant outflow position to the water jacket of the supply passage is deviated toward the intake port side far from the inflow passage, the refrigerant easily stays around the intake port near the inflow passage. Can be prevented from deteriorating. Therefore, it is possible to prevent the warm-up property at the intake port from deteriorating and the warm-up property from being varied between the two intake ports, and the cooling water in the heat storage container is supplied to the water jacket by the amount of the warm-up property at the intake port. It is possible to suppress a reduction in the improvement effect such as emission and warm-up caused by flowing into the engine. In the cylinder closest to the outflow passage, the refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder easily flows to the outflow passage side. The refrigerant is less likely to stay around the intake port compared to a distant intake port. However, since the refrigerant outflow position to the water jacket of the supply passage is deviated toward the intake port side far from the outflow passage, the refrigerant easily stays around the intake port near the outflow passage. Can be prevented from deteriorating. Therefore, it is possible to prevent the warm-up property at the intake port from deteriorating and the warm-up property from being varied between the two intake ports, and the cooling water in the heat storage container is supplied to the water jacket by the amount of the warm-up property at the intake port. It is possible to suppress a reduction in the improvement effect such as emission and warm-up caused by flowing into the engine.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the water in the supply passage is also a cylinder closer to the outflow passage than a cylinder closest to the passage among the cylinders located closer to the inflow passage. The refrigerant outflow position into the jacket is biased toward the intake port far from the inflow passage, and among the cylinders located near the outflow passage, the cylinder closer to the inflow passage than the cylinder closest to the passage, The outflow position of the refrigerant in the water jacket of the supply passage is deviated toward the intake port side far from the outflow passage.

  Among the cylinders located closer to the inflow passage, in the cylinder closer to the outflow passage than the cylinder closest to the passage, the intake port close to the inflow passage is the same as the cylinder nearest to the inflow passage. The refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder is less likely to stay than the port. However, since the refrigerant outflow position to the water jacket of the supply passage is deviated toward the intake port side far from the inflow passage, the refrigerant easily stays around the intake port near the inflow passage. Can be prevented from deteriorating. Also, among the cylinders located near the outflow passage, in the cylinder closer to the inflow passage than the cylinder closest to the passage, the intake port close to the outflow passage as well as the cylinder nearest to the outflow passage is from the outflow passage. Compared to the far intake port, the refrigerant flowing into the water jacket from the supply passage corresponding to the cylinder is less likely to stay. However, since the refrigerant outflow position to the water jacket of the supply passage is deviated toward the intake port side far from the outflow passage, the refrigerant easily stays around the intake port near the outflow passage. Can be prevented from deteriorating.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the outflow position of the supply passage in the cylinder closer to the outflow passage than the cylinder closest to the inflow passage among the cylinders located closer to the inflow passage. Is smaller than that of the outflow position of the supply passage in the cylinder closest to the inflow passage, and is closer to the inflow passage than the cylinder closest to the passage among the cylinders located near the outflow passage. The deviation of the outflow position of the supply passage in the cylinder of the cylinder was made smaller than the deviation of the outflow position of the supply passage in the cylinder closest to the outflow passage.

  Of the cylinders positioned closer to the inflow passage, for the cylinder closer to the outflow passage than the cylinder closest to the passage, the refrigerant flowing into the water jacket is less likely to flow to the inflow passage side than the cylinder closest to the inflow passage. . Taking this into account, the cylinder closer to the outflow passage than the cylinder closest to the inflow passage has a smaller deviation of the refrigerant outflow position to the water jacket of the supply passage than the cylinder closest to the inflow passage. Yes. Accordingly, in the cylinder closer to the outflow passage than the cylinder closest to the inflow passage, the deterioration of the warm-up property is accurately suppressed at the intake port closer to the inflow passage, and excessive deviation of the outflow position is suppressed. Can do. Also, among the cylinders located near the outflow passage, for the cylinder closer to the inflow passage than the cylinder closest to the passage, the refrigerant flowing into the water jacket flows to the outflow passage side from the cylinder nearest to the outflow passage. It becomes difficult. Taking this into account, the cylinder closer to the inflow passage than the cylinder closest to the outflow passage has a smaller deviation of the refrigerant outflow position to the water jacket of the supply passage than the cylinder closest to the outflow passage. Yes. Therefore, in the cylinder closer to the inflow passage than the cylinder closest to the outflow passage, the deterioration of the warm-up property at the intake port near the inflow passage is accurately suppressed, and excessive deviation of the outflow position is suppressed. be able to.

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. 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 7 through which cooling water discharged from the water pump 6 flows from one side (right side in the figure) of the water jacket 5 of the bank 1a in the cylinder arrangement direction. And an outflow passage 8 through which the cooling water in the water jacket 5 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 5 through the inflow passage 7 as indicated by the arrow A, and flows in the water jacket 5 in the cylinder arrangement direction (from right to left in the figure). After taking heat from each cylinder, it flows out of the water jacket 5 from 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. In this heat storage circuit H, the electric pump 13 that pumps the cooling water in the circuit H, the heat storage container 14 that retains and stores the cooling water, and the cooling water in the heat storage container 14 are sent out toward the water jacket 5. A distribution passage 16 is provided. A supply passage 15 provided for each cylinder is connected to the distribution passage 16, and the supply passage 15 communicates the distribution passage 16 with a portion corresponding to each cylinder of the water jacket 5.

  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, distributed to the supply passages 15, and flows into the water jacket 5 through the supply passages 15. . The warm cooling water flowing into the water jacket 5 warms the portion by heat exchange with the portion corresponding to each cylinder of the bank 1a, and then the water jacket from the inflow passage 7 and the outflow passage 8 of the cooling circuit R. 5 will flow out.

Here, the outflow position of the cooling water from the supply passage 15 into the water jacket 5 will be described with reference to FIGS.
FIG. 2 is an enlarged cross-sectional view of the cylinder head 2 in the bank 1a. 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 5 is formed around the combustion chamber 21, the intake passage 22, and the exhaust passage 23. ing. The intake passage 22 is branched into two and connected to the combustion chamber 21 (only one branch portion is shown in the figure), and a fuel injection valve is provided in a portion where the intake passage 22 is not branched. 24 is provided. The fuel injection valve 24 injects fuel toward a plurality of (two) intake ports 22a and 22b that are connected to the intake passage 22 branched in the combustion chamber 21 as described above.

  The outflow position of the cooling water into the water jacket 5 in the supply passage 15 is set in the vicinity of the intake ports 22a and 22b. 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 5 through the respective supply passages 15, the inflowing cooling water is first supplied to the cylinder head 2. Since it contacts the vicinity of the intake ports 22a and 22b, the wall surfaces of the intake ports 22a and 22b can be effectively warmed. Therefore, even if the fuel injected from the fuel injection valve 24 adheres to the wall surfaces of the intake ports 22a and 22b, the fuel is easily vaporized, and the emission, fuel consumption, and startability due to the liquid fuel adhering to the wall surfaces The adverse effect on can be suppressed.

  In order to improve emission, fuel consumption, and startability, it is preferable to warm the two intake ports 22a and 22b for each cylinder evenly. Therefore, the outflow position of the cooling water into the water jacket 5 of the supply passage 15 is set so that the wall surfaces of the intake ports 22a and 22b are easily warmed by the cooling water as shown in FIG. It is set to be in between.

  However, in the first cylinder # 1 closest to the outflow passage 8, the cooling water flowing into the water jacket 5 through the supply passage 15 easily flows out from the outflow passage 8. For this reason, in the first cylinder # 1, the cooling water hardly stays around the intake port 22a near the outflow passage 8, and the warm-up property of the intake port 22a tends to be worse than that of the intake port 22b far from the outflow passage 8. is there. Further, in the seventh cylinder # 7 closest to the inflow passage 7, the cooling water flowing into the water jacket 5 through the supply passage 15 easily flows out from the inflow passage 7. For this reason, in the seventh cylinder # 7, the cooling water hardly stays around the intake port 22b near the inflow passage 7, and the warm-up property of the intake port 22b tends to be worse than that of the intake port 22a far from the inflow passage 7. is there.

  Regarding the deterioration of the warm-up property of the intake port 22a in the first cylinder # 1 and the deterioration of the warm-up property in the seventh cylinder # 7 as described above, the supply passage 15 in these cylinders into the water jacket 5 is introduced. It is suppressed by setting the outflow position of the cooling water. Hereinafter, the setting of the outflow position will be described separately for the first cylinder # 1 and the seventh cylinder # 7.

[First cylinder # 1]
In the first cylinder # 1, the outflow position is deviated toward the intake port 22b far from the outflow passage 8 in order to suppress deterioration in warm-up performance of the intake port 22a. In other words, the outflow position is a position shifted by a predetermined amount a1 in the direction away from the outflow passage 8 with respect to the center C1 of the cylinder bore of the first cylinder # 1. By setting the outflow position in this way, the coolant entering the water jacket 5 from the supply passage 15 in the first cylinder # 1 is likely to stay around the intake port 22a. Thus, variation in warm-up property between the two intake ports 22a and 22b can be suppressed. When the above-mentioned warm-up variation occurs between the intake ports 22a and 22b, the emission due to the inflow of cooling water from the heat storage container 14 to the water jacket 5 is reduced by the amount of deterioration in warm-up at the intake port 22a. And it can suppress that improvement effects, such as startability, decline.

  Here, regarding the temperature change of the wall surfaces of the two intake ports 22a and 22b in the first cylinder # 1 when the cooling water flows into the water jacket 5 from the heat storage container 14, the setting of the outflow position (hereinafter, offset setting). ) And the case where the same setting is not performed (non-offset setting) will be described in detail with reference to FIGS. 4 and 5. Here, as an example of the non-offset setting, here, the state where the outflow position is the intermediate position between the two intake ports 22a and 22b in all the cylinders is given.

  In the non-offset setting, when cooling water flows into the water jacket 5, the temperature of the wall surface of the intake port 22a in the first cylinder # 1 rises as shown by the solid line in FIG. 4, and the wall surface of the intake port 22b The temperature rises as shown by the broken line. As can be seen from the figure, the temperature of the wall surface of the intake port 22b far from the outflow passage 8 is a minimum temperature at which the fuel can be vaporized when the injected fuel from the fuel injection valve 24 adheres to the wall surface. While reaching the value, the temperature of the wall surface of the intake port 22a near the outflow passage 8 does not reach the target value. This is because the intake port 22a is close to the outflow passage 8, so that the cooling water flowing into the water jacket 5 from the supply passage 15 flows out of the outflow passage 8 immediately after the inflow, and does not stay around the intake port 22a. This is because sufficient heat exchange is not performed between the cooling water and the wall surface of the intake port 22a.

  On the other hand, in the offset setting, when cooling water flows into the water jacket 5, the temperature of the wall surface of the intake port 22a in the first cylinder # 1 rises as shown by the solid line in FIG. The temperature of the wall surface 22b rises as shown by the broken line. In this case, the temperature of the wall surface of the intake port 22b far from the outflow passage 8 reaches the target value, and the temperature of the wall surface of the intake port 22a near the outflow passage 8 also reaches the target value. This is because the outflow position of the cooling water into the water jacket 5 in the supply passage 15 is uneven toward the intake port 22b, and the cooling water flowing into the water jacket 5 from the supply passage 15 due to this unevenness is around the intake port 22a. This is because it becomes easy to stay and sufficient heat exchange is performed between the cooling water and the wall surface of the intake port 22a.

[Seventh cylinder # 7]
In the seventh cylinder # 7, the outflow position is deviated toward the intake port 22a far from the inflow passage 7 in order to suppress the deterioration in warm-up performance of the intake port 22b. In other words, the outflow position is shifted from the center C7 of the cylinder bore of the seventh cylinder # 7 by a predetermined amount a7. By setting the outflow position in this manner, the coolant entering the water jacket 5 from the supply passage 15 in the seventh cylinder # 7 is likely to stay around the intake port 22b, so that the warm-up performance is deteriorated at the intake port 22b. Thus, variation in warm-up property between the two intake ports 22a and 22b can be suppressed. When the above-described variation in warm-up property occurs between the intake ports 22a and 22b, emissions due to the inflow of cooling water from the heat storage container 14 to the water jacket 5, fuel consumption, and the amount of deterioration in warm-up at the intake port 22b It can suppress that improvement effects, such as startability, fall.

  Here, regarding the temperature change of the wall surfaces of the two intake ports 22a and 22b in the seventh cylinder # 7 when the cooling water flows into the water jacket 5 from the heat storage container 14, the setting of the outflow position (offset setting) is performed. A difference between the case where the setting is performed and the case where the setting is not performed (non-offset setting) will be described in detail with reference to FIGS. 6 and 7. As for the non-offset setting here, as in the case of [first cylinder # 1], the state where the outflow position is set to an intermediate position between the two intake ports 22a and 22b in all the cylinders is taken as an example. Yes.

  In the non-offset setting, when cooling water flows into the water jacket 5, the temperature of the wall surface of the intake port 22a in the seventh cylinder # 7 rises as shown by the solid line in FIG. 6, and the wall surface of the intake port 22b The temperature rises as shown by the broken line. As can be seen from the figure, the temperature of the wall surface of the intake port 22a far from the inflow passage 7 reaches the target value, whereas the temperature of the wall surface of the intake port 22b near the inflow passage 7 does not reach the target value. This is because the intake port 22b is close to the inflow passage 7, so that the cooling water flowing into the water jacket 5 from the supply passage 15 flows out of the inflow passage 7 immediately after the inflow, and hardly stays around the intake port 22b. This is because sufficient heat exchange is not performed between the cooling water and the wall surface of the intake port 22b.

  On the other hand, in the offset setting, when cooling water flows into the water jacket 5, the temperature of the wall surface of the intake port 22b in the seventh cylinder # 7 rises as shown by the broken line in FIG. The temperature of the wall surface of 22a rises as shown by the solid line. In this case, the temperature of the wall surface of the intake port 22a far from the inflow passage 7 reaches the target value, and the temperature of the wall surface of the intake port 22b near the inflow passage 7 also reaches the target value. This is because the outflow position of the cooling water into the water jacket 5 in the supply passage 15 is deviated toward the intake port 22a, and the cooling water flowing into the water jacket 5 from the supply passage 15 due to this unevenness flows around the intake port 22b. This is because it becomes easier to stay and sufficient heat exchange is performed between the cooling water and the wall surface of the intake port 22b.

  By the way, of the first cylinder # 1 and the third cylinder # 3 located near the outflow passage 8, the cooling water tends to hardly stay around the intake port 22a near the outflow passage 8 for the first cylinder # 1. As described above, the third cylinder # 3 closer to the inflow passage 7 than the first cylinder # 1 has the same tendency as the first cylinder # 1. Of the fifth cylinder # 5 and the seventh cylinder # 7 located near the inflow passage 7, the seventh cylinder # 7 has a tendency that the cooling water does not easily stay around the intake port 22b near the inflow passage 7. As described above, the fifth cylinder # 5 and closer to the outflow passage 8 than the seventh cylinder # 7 have the same tendency as the seventh cylinder # 7.

  Cooling water into the water jacket 5 of the supply passage 15 in these cylinders also deteriorates in the warm-up property of the intake port 22a in the third cylinder # 3 and in the warm-up property in the fifth cylinder # 5. It is suppressed by setting the outflow position. Hereinafter, the setting of the outflow position in the third cylinder # 3 and the fifth cylinder # 5 will be individually described in the order of the third cylinder # 3 and the fifth cylinder # 5 with reference to FIG.

[3rd cylinder # 3]
In the third cylinder # 3, the outflow position is deviated toward the intake port 22b far from the outflow passage 8 in order to suppress deterioration in warm-up performance of the intake port 22a. In other words, the outflow position is a position shifted by a predetermined amount a3 in the direction away from the outflow passage 8 with respect to the center C3 of the cylinder bore of the third cylinder # 3. However, in the third cylinder # 3, the tendency of the coolant flowing into the water jacket 5 from the supply passage 15 to easily flow toward the outflow passage 8 becomes smaller than that of the first cylinder # 1, and the coolant is the first cylinder. It is less likely to flow to the outflow passage 8 side than # 1. Considering this, the predetermined amount a3 is set to a value smaller than the predetermined amount a1 of the first cylinder # 1. Accordingly, in the third cylinder # 3, the deviation of the outflow position toward the intake port 22b is made smaller than the similar deviation in the first cylinder # 1. In other words, the deviation amount (predetermined amount a3) of the outflow position in the third cylinder # 3 with respect to the center C3 of the cylinder bore is made smaller than the similar deviation amount (predetermined amount a1) in the first cylinder # 1. By setting the outflow position in the third cylinder # 3, it is possible to prevent the warm-up property of the intake port 22a from deteriorating in the same cylinder.

[Fifth cylinder # 5]
In the fifth cylinder # 5, the outflow position is deviated toward the intake port 22a far from the inflow passage 7 in order to suppress deterioration in warm-up performance of the intake port 22b. In other words, the outflow position is a position shifted by a predetermined amount a5 in the direction away from the inflow passage 7 with respect to the center C5 of the cylinder bore of the fifth cylinder # 5. However, in the fifth cylinder # 5, the tendency that the coolant flowing into the water jacket 5 from the supply passage 15 easily flows to the inflow passage 7 side becomes smaller than that in the seventh cylinder # 7, and the coolant is supplied to the seventh cylinder # 5. It becomes more difficult to flow to the inflow passage 7 side than # 7. Considering this, the predetermined amount a5 is set to a value smaller than the predetermined amount a7 of the seventh cylinder # 1. Therefore, in the fifth cylinder # 5, the deviation of the outflow position toward the intake port 22a is made smaller than the similar deviation in the seventh cylinder # 7. In other words, the deviation amount (predetermined amount a5) of the outflow position in the fifth cylinder # 5 with respect to the center C5 of the cylinder bore is made smaller than the similar deviation amount (predetermined amount a7) in the seventh cylinder # 7. By setting the outflow position in the fifth cylinder # 5 as described above, it is possible to suppress the warm-up performance of the intake port 22b in the same cylinder from being deteriorated.

According to the embodiment described in detail above, the following effects can be obtained.
(1) In the cylinder closest to the outflow passage 8, the outflow position of the cooling water to the water jacket 5 in the supply passage 15 is biased toward the intake port 22 b far from the outflow passage 8. For this reason, in the first cylinder # 1, the cooling water that has entered the water jacket 5 from the supply passage 15 tends to stay around the intake port 22a close to the outflow passage 8, and the warm-up performance of the intake port 22a deteriorates. Can be suppressed. Therefore, in the first cylinder # 1, the warm-up property at the intake port 22a is suppressed from being deteriorated by the deterioration in the warm-up property at the intake port 22a, and the warm-up property at the intake port 22a is suppressed. It is possible to suppress a reduction in the effect of improving the emission, fuel consumption, and startability by causing the cooling water of the heat storage container 14 to flow into the water jacket 5 by the amount of deterioration in performance. Further, in the seventh cylinder # 7 closest to the inflow passage 7, the outflow position is deviated to the intake port 22a side far from the inflow passage 7. For this reason, in the seventh cylinder # 7, the coolant entering the water jacket 5 from the supply passage 15 tends to stay around the intake port 22b near the inflow passage 7, and the warm-up performance of the intake port 22b is deteriorated. Can be suppressed. Accordingly, in the seventh cylinder # 7, the warm-up property at the intake port 22b is suppressed by the deterioration of the warm-up property at the intake port 22b, and the warm-up property varies between the two intake ports 22a, 22b. It is possible to suppress a reduction in the effect of improving the emission, fuel consumption, and startability by causing the cooling water of the heat storage container 14 to flow into the water jacket 5 by the amount of deterioration in performance.

  (2) In the third cylinder # 3, which is a cylinder near the outflow passage 8, the cooling water that has entered the water jacket 5 from the supply passage 15 stays around the intake port 22a near the outflow passage 8 as in the first cylinder # 1. There is a tendency to become difficult. However, this tendency is smaller than that of the first cylinder # 1. For this reason, in the third cylinder # 3, the outflow position is deviated smaller than the first cylinder # 1 closer to the intake port 22b. Thereby, in the third cylinder # 3, it is possible to prevent the outflow position from being excessively uneven while accurately suppressing the deterioration in warm-up of the intake port 22a near the outflow passage 8. Further, in the fifth cylinder # 5, which is a cylinder near the inflow passage 7, similarly to the seventh cylinder # 7, the cooling water entering the water jacket 5 from the supply passage 15 does not easily stay around the intake port 22b near the inflow passage 7. Tend to be. However, this tendency is smaller than that of the seventh cylinder # 7. For this reason, in the fifth cylinder # 5, the outflow position is deviated slightly closer to the intake port 22a than in the seventh cylinder # 7. As a result, in the fifth cylinder # 5, it is possible to suppress excessive deviation of the outflow position while accurately suppressing deterioration in warm-up performance of the intake port 22b near the inflow passage 7.

  Although detailed description has been given so far for the bank 1a, the same effect as that produced by the bank 1a can be obtained for the bank 1b having the same configuration as the bank 1a.

Hereinafter, modifications of the above embodiment will be described.
In the third cylinder # 3, the deviation amount of the cooling water outflow position into the water jacket 5 of the supply passage 15 is set to a predetermined amount a3. This predetermined amount a3 is equal to the predetermined amount a1 of the first cylinder # 1. May be. In the fifth cylinder # 5, the deviation amount of the outflow position is set to the predetermined amount a5. However, the predetermined amount a5 may be equal to the predetermined amount a7 of the seventh cylinder # 7.

For the third cylinder # 3 and the fifth cylinder # 5, it is not always necessary to deviate the position of the coolant flowing into the water jacket 5 in the supply passage 15.
The present invention may be applied to an engine having three or more intake ports per cylinder.

  The present invention may be applied to engines other than V-type eight cylinders such as in-line four cylinders and V-type six cylinders.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the whole cooling device of the engine in this embodiment. The expanded sectional view which shows the internal structure of the cylinder head in the said engine. The schematic diagram which shows the outflow position of the cooling water in the water jacket in the supply path of each cylinder. The graph which shows how the temperature of the intake port wall surface of the first cylinder changes when cooling water flows from the heat storage container to the water jacket of the engine. The graph which shows how the temperature of the intake port wall surface of the first cylinder changes when cooling water flows from the heat storage container to the water jacket of the engine. The graph which shows how the temperature of the intake port wall surface of a 7th cylinder changes when cooling water is poured from the heat storage container to the water jacket of the engine. The graph which shows how the temperature of the intake port wall surface of a 7th cylinder changes when cooling water is poured from the heat storage container to the water jacket of the engine.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine, 1a, 1b ... Bank (engine body), 2 ... Cylinder head, 5 ... Water jacket, 6 ... Water pump, 7 ... Inflow passage, 8 ... Outflow passage, 9 ... Bypass passage, 10 ... Thermostat, 12 ... Radiator, 13 ... Electric pump, 14 ... Thermal storage container, 15 ... Supply passage, 16 ... Distribution passage, 17 ... On-off valve, 21 ... Combustion chamber, 22 ... Intake passage, 22a, 22b ... Intake port, 23 ... Exhaust passage, 24 ... fuel injection valve.

Claims (6)

Applied to a multi-cylinder engine having a plurality of intake ports in one cylinder, an inflow passage for allowing the refrigerant to flow into the water jacket of the cylinder head in a cooling circuit in which the refrigerant for cooling the engine body circulates, and in the water jacket An engine having an outflow passage for allowing the refrigerant to flow out, storing the refrigerant in the cooling circuit in a heat storage container while keeping the heat in the heat storage container, and flowing the refrigerant in the heat storage container into the water jacket through a supply passage provided for each cylinder In the cooling device of
In the cylinder closest to the inflow passage, the outflow position of the refrigerant into the water jacket of the supply passage is a position shifted in a direction away from the inflow passage with respect to the center of the cylinder bore of the cylinder,
In the cylinder closest to the outflow passage, the refrigerant outflow position in the water jacket of the supply passage is shifted from the center of the cylinder bore of the cylinder in a direction away from the outflow passage. Cooling system. Among the cylinders located near the inflow passage, the cylinders closer to the outflow passage than the cylinder closest to the passage also have the refrigerant outflow position into the water jacket of the supply passage as the center of the cylinder bore of the cylinder. And a position shifted in a direction away from the inflow passage,
Among the cylinders located near the outflow passage, the refrigerant outflow position in the water jacket of the supply passage is set at the center of the cylinder bore of the cylinder even in the cylinder closer to the inflow passage than the cylinder closest to the passage. The engine cooling apparatus according to claim 1, wherein the engine cooling apparatus is at a position shifted in a direction away from the outflow passage. Of the cylinders located closer to the inflow passage, the displacement amount of the outflow position of the supply passage in the cylinder closer to the outflow passage than the cylinder closest to the passage is closest to the inflow passage. Smaller than the deviation amount of the outflow position of the supply passage in the cylinder with respect to the center of the cylinder bore,
Of the cylinders located closer to the outflow passage, the amount of deviation of the outflow position of the supply passage in the cylinder closer to the inflow passage than the cylinder closest to the passage to the center of the cylinder bore is closest to the outflow passage. The engine cooling device according to claim 2, wherein the amount of deviation of the outflow position of the supply passage in the cylinder from the center of the cylinder bore is made smaller. Applied to a multi-cylinder engine having two intake ports in one cylinder, an inflow passage for allowing the refrigerant to flow into the water jacket of the cylinder head in a cooling circuit in which the refrigerant for cooling the engine body circulates, and in the water jacket An engine having an outflow passage for allowing the refrigerant to flow out, storing the refrigerant in the cooling circuit in a heat storage container while keeping the heat in the heat storage container, and flowing the refrigerant in the heat storage container into the water jacket through a supply passage provided for each cylinder In the cooling device of
In the cylinder closest to the inflow passage, the refrigerant outflow position to the water jacket of the supply passage is biased toward the intake port far from the inflow passage,
In the cylinder closest to the outflow passage, the refrigerant outflow position of the supply passage to the water jacket is biased toward the intake port far from the outflow passage. Among the cylinders located closer to the inflow passage, even in the cylinder closer to the outflow passage than the cylinder closest to the passage, the refrigerant outflow position into the water jacket of the supply passage is set to the intake air far from the inflow passage. Deviate to the port side,
Among the cylinders located near the outflow passage, the refrigerant outflow position in the water jacket of the supply passage is also far from the outflow passage even in the cylinder closer to the inflow passage than the cylinder closest to the passage. The engine cooling device according to claim 4, wherein the engine cooling device is biased to the side. Among the cylinders positioned closer to the inflow passage, the supply passage in the cylinder closest to the inflow passage is defined as the deviation in the outflow position of the supply passage in the cylinder closer to the outflow passage than the cylinder closest to the passage. Smaller than the deviation of the outflow position of
Among the cylinders positioned closer to the outflow passage, the supply passage in the cylinder closest to the outflow passage is determined as the deviation in the outflow position of the supply passage in the cylinder closer to the inflow passage than the cylinder closest to the passage. The engine cooling device according to claim 5, wherein the engine cooling device is smaller than the deviation of the outflow position of the engine.

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