JP2004162689A - Vehicle engine cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle engine cooling device capable of effectively heating circulating liquid in starting, for example, and cooling it after warm-up. <P>SOLUTION: This vehicle engine cooling device is composed in such a way that a cylinder head side circulation channel Ch can be formed through a first pump P1, a cylinder head inner passage Fh, and a circulation liquid cooling mechanism RO. A second pump P2 is provided, and a cylinder block isolated circulation passage Cid to circulate circulation liquid between the second pump P2 and a cylinder block inner passage Fb can be formed separately from the cylinder head side circulation passage Ch. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle engine cooling device.
More specifically, a vehicle engine includes a cylinder block having a cylinder block flow path through which a circulating fluid flows, and a cylinder head also having a cylinder head flow path through which a circulating fluid flows. And a circulating fluid cooling mechanism capable of cooling the circulating fluid by heat exchange with the outside air, and a first pump, a cylinder head fluid passage, and a cylinder head passing through the circulating fluid cooling mechanism. The present invention relates to a vehicle engine cooling device configured to form a side circulation path.
[0002]
This type of circulating liquid cooling mechanism generally includes a radiator, a bypass path for bypassing the radiator, a radiator, a thermostat valve for controlling a branch flow to the bypass path, and the like.
[0003]
[Prior art]
As a conventional cooling device for a vehicle engine, for example, the one shown in FIG. 11 is known.
In this device, the discharge side of the water pump WP serving as the first pump P1 is connected to the water jacket BJ on the cylinder block side, and from the water jacket BJ on the cylinder block side through the communication portion 106 near the water pump WP. A first circulation path C1 of a series type which enters the water jacket HJ, bypasses the radiator R and reaches the water pump WP via the thermostat valve TSV, and the water pump via the radiator R and the thermostat valve TSV from the cylinder block side water jacket BJ. The cylinder block side circulation path C2 leading to the WP can be formed (for example, see Patent Document 1).
[0004]
In this conventional configuration, the flow path is set by the thermostat valve TSV so that the circulating fluid flows only to the first circulation path C1 during warm-up, and to the first circulation path C1 and the cylinder block side circulation path C2 after warm-up. Can be switched.
[0005]
That is, the circulating fluid in the cylinder block side water jacket BJ is always in communication with the cylinder head side water jacket HJ.
The outlet of the water jacket BJ on the cylinder block side communicates with the radiator R at one end, and a thermostat valve TSV connected to the other end of the radiator R flows to the radiator R when the circulating fluid is lower than a predetermined temperature. When the circulating fluid temperature rises, the circulating fluid flow path is opened to circulate the circulating fluid from the radiator R to the water pump WP.
[0006]
However, the configuration of Patent Document 1 has the following problem.
In Patent Literature 1, the thermostat valve TSV opens and closes the cylinder block side circulation path C2 in accordance with the circulating liquid temperature, thereby interrupting the circulation of the circulating liquid in the circulation path C2.
As a result, after warm-up, the circulating fluid that has passed through the water jacket BJ on the cylinder block side sequentially reaches the water jacket HJ on the cylinder head side. In this case, it is ideally preferable to keep the temperature on the cylinder block side higher than the temperature on the cylinder head side in view of the relationship between combustion efficiency and mechanical friction of the engine. The cylinder block side and the cylinder head side are cooled.
[0007]
In other words, even if the temperature adjustment of the cylinder head and the temperature adjustment of the cylinder block are to be adjusted under different profiles and cooling conditions, the cylinder head and the cylinder block must be adjusted under different conditions because the circulating fluid flow paths are connected. Was difficult.
[0008]
Therefore, it has been proposed to provide a cylinder head flow path in which the circulating fluid flows in the cylinder head, and to provide a cylinder block flow path in which the circulating fluid flows in the cylinder block independently of each other. By doing so, it has been proposed that the cylinder block outlet water temperature be higher than the cylinder outlet water temperature to reduce friction (Patent Document 2).
[0009]
[Patent Document 1]
JP-A-8-296439
[0010]
[Patent Document 2]
JP-A-5-086661
[0011]
[Problems to be solved by the invention]
However, also in this method, the inlet water temperature to each part is a single level, and an outlet temperature difference occurs due to a difference in cooling water flow velocity in the jacket.
In other words, since the temperature difference between the inlet and outlet of the cooling water of the cylinder block, cylinder head, and their respective coolants is large (the temperature difference between the cylinders is large), the mechanical friction is reduced by maintaining the cylinder block at a high temperature, and the combustion state is improved. It is difficult to obtain a sufficient effect.
[0012]
The present invention has been made in view of the above-described problems, and provides a vehicle engine cooling device that can effectively realize a rise in circulating fluid temperature and cooling after warm-up, for example, at the time of starting the vehicle engine. It is in.
Another object of the present invention is to provide a vehicle engine cooling device capable of setting different temperatures between a cylinder head and a cylinder block even after warm-up.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a vehicle engine includes a cylinder block provided with a passage in a cylinder block through which a circulating fluid flows, and a cylinder head provided with a passage inside the cylinder head through which a circulating fluid flows. A flow path is provided independently of the flow path in the cylinder head,
A circulating liquid cooling mechanism capable of cooling the circulating liquid by heat exchange with outside air is provided,
The first pump that obtains driving force from the engine, the passage in the cylinder head, a characteristic structure of a vehicle engine cooling device configured to be able to form a cylinder head side circulation passage passing through the circulating fluid cooling mechanism,
A second pump is provided, and a cylinder block single circulation path in which circulating fluid circulates between the second pump and the cylinder block flow path is configured to be formed independently of the cylinder head side circulation path,
Circulating fluid is allowed to flow from the cylinder head side circulation path to the cylinder block single circulation path, and discharge of the circulating fluid from the cylinder block single circulation path to the cylinder head side circulation path is enabled. It is in.
[0014]
In the cooling device having this configuration, the cylinder head side circulation path and the cylinder block independent circulation path can be formed independently.
Therefore, for example, at the time of warming-up, the cylinder block single circulation path is formed independently of the cylinder head side circulation path, so that the circulating fluid flows through the cylinder block flow path and the second pump in the cylinder block single circulation path. And circulates only between the cylinder block and the cylinder block, so that the warm-up can be quickly performed without releasing the heat generated in the cylinder block.
[0015]
Then, even after the warm-up, for example, in a situation where the cylinder head side is lower in temperature than the cylinder block side and it is not preferable for the cylinder block side to be cooled, the cylinder block side independent circulation path is formed independently and the cylinder block side is formed. Can be suppressed.
In the present application, the circulating fluid cooled by the circulating fluid cooling mechanism is uniquely configured to flow through the cylinder head internal flow path, so that this state is easily realized.
[0016]
In addition, since it is possible for the circulating fluid to flow from the cylinder head side circulation path to the cylinder block single circulation path and to be discharged to the cylinder head circulation path side, in a state where independent formation of the cylinder block single circulation path is not required, The inflow / outflow of the circulating fluid into the single circulation path is performed, so that the circulation state of the circulating liquid flowing in this path and the pressure can be adjusted.
[0017]
Also, in this state, by adjusting the amount of circulating fluid flowing into and out of the cylinder block independent circulation path, the difference in heat capacity and heat reception between the cylinder head side and the cylinder block side can be caused. Thus, it is possible to bring the temperatures of these two parts into a desired state according to the circulating liquid amount.
[0018]
Furthermore, when the engine is under a high load and it is desired to perform maximum cooling, the cooling capacity of the circulating fluid cooling mechanism is maximized, and the first pump and the second pump are operated together to remove the cooled circulating fluid. When the cylinder head is guided from the cylinder head side to the cylinder block side, cooling of the cylinder head side and the cylinder block side can be performed to the maximum while ensuring the forced circulation state in the cylinder block independent circulation path.
[0019]
As described above, the cylinder block single circulation path is formed, and between the circulation path and the cylinder head side circulation path, the inflow and discharge of the circulating fluid are allowed.
An inflow-side connecting passage from a cylinder head upstream passage portion (a passage portion through which the circulating fluid flows into the cylinder head from the first pump) to the cylinder head inside passage to the cylinder block independent circulation passage; To allow the inflow of the circulating liquid.
In the case of this configuration, the supply of the circulating fluid to the cylinder block alone circulation path is performed by the circulating fluid having a relatively high pressure, and the supply can be reliably performed.
In addition, since the circulating fluid flowing into the cylinder block independent circulation path has not been heated by the cylinder head, it is sufficient when the cylinder block side is to be directly cooled by the circulating fluid cooled by the circulating fluid cooling mechanism. Cooling capacity can be obtained.
[0020]
In order to allow the inflow of the circulating fluid from such a cylinder head upstream flow path to the cylinder block independent circulation path, as described in claim 2, the cylinder head upstream flow path section And a cylinder block downstream flow path portion from the outlet of the flow passage in the cylinder block to the suction port of the second pump (a flow path in which a circulating fluid flows out of the cylinder block to form a cylinder block independent circulation path, A first control valve in the inflow-side connection path provided between
By the control state of the first control valve, from the cylinder head upstream flow path portion to the cylinder block independent circulation path, the inflow of the circulating fluid through the inflow side connection path is enabled,
The first control valve may be configured to control the independent formation of the cylinder block independent circulation path. This configuration is a configuration corresponding to the first embodiment of the present application.
[0021]
In this case, the inflow of the circulating fluid from the cylinder head side circulation path into the cylinder block single circulation path can be controlled by the control state of the first control valve (flow path selection). Can be formed independently.
Therefore, by the control state of the first control valve, it is possible to realize the warming-up by using the state in which the cylinder block single circulation path is independently formed, and to suppress the temperature drop of the cylinder block after the warming-up. When the inflow / outflow is allowed, appropriate execution of cooling by the function of the circulating fluid cooling mechanism and appropriate setting of the temperature on the cylinder head side and the cylinder block side can be realized.
[0022]
From the cylinder head upstream flow path portion that reaches the flow path in the cylinder head from the first pump to the cylinder block independent circulation path, allowing the inflow of circulating fluid through the inflow side connection path, as another configuration, An inter-pump connection path for connecting a discharge port of the first pump and a suction port of the second pump is provided, and a downstream flow of the cylinder block from an outlet of the flow path in the cylinder block to a suction port of the second pump. A second control valve is provided in the road section,
The second control valve may be configured to discharge the circulating fluid to the cylinder head side circulation path, and the second control valve may control the independent formation of the cylinder block single circulation path. This configuration corresponds to the second embodiment of the present application.
[0023]
In this case as well, it is possible to form a cylinder block independent circulation path by the control state (flow path selection) of the second control valve. However, by making the first pump and the second pump substantially a direct connection type, The discharge pressure of the first pump can be effectively used for feeding the circulating fluid into the cylinder block single circulation path, and the flow in the cylinder block single circulation path can be ensured well.
In addition, the independent formation of the cylinder block single circulation path depends on the control state of the second control valve.
Further, in this configuration, since the first and second pumps can be coaxial and integrated, a conventional pump having a tandem structure can be used.
[0024]
Now, as described in claim 3, a downstream portion of the cylinder head from the channel inside the cylinder head to the circulating fluid cooling mechanism (a channel portion into which the circulating fluid flows out of the cylinder head). It is also preferable that the circulating fluid can flow into the cylinder block single circulation path through the inflow side connection path.
[0025]
In this case, in effect, the circulating fluid is sucked on the cylinder block single circulation path side, but the circulating fluid flowing into the cylinder block single circulation path cools the cylinder head through the cylinder head internal flow path. Therefore, when it is desired to use the heat of the cylinder head side to raise the temperature of the cylinder block side, this structure is used to guide the circulating fluid from the cylinder head side to the cylinder block side to maintain the temperature of the cylinder block side. It becomes possible.
[0026]
As described above, as a configuration that allows the circulating fluid to flow from the cylinder head downstream flow path portion to the cylinder block single circulation path, the cylinder head downstream flow path portion and the second pump can be used to supply the circulating fluid inside the cylinder block. A discharge-side connecting passage provided between the cylinder block upstream flow passage portion (a flow passage portion from which the circulating fluid flows into the cylinder block) leading to the passage and the cylinder head side from within the cylinder block single circulation passage. It is possible to provide a check valve that allows the flow of the circulating liquid into the circulation path and prohibits the flow in the reverse direction. This configuration corresponds to the third embodiment of the present application.
[0027]
In this configuration, when the discharge amount from the second pump increases and exceeds the set pressure of the check valve, discharge of the circulating fluid from the cylinder block independent circulation path to the cylinder head side circulation path occurs. I do.
Therefore, for example, when it is desired to raise the temperature of the cylinder block side by using the heat of the cylinder head side, the inflow and discharge of the circulating fluid into and out of the cylinder block independent circulation path are performed according to the operating state of the second pump and the check valve. This can depend on the set pressure and the like, and as a result, the temperature of the cylinder block is adjusted.
[0028]
Further, as a configuration in which the circulating fluid can flow from the cylinder head downstream flow path portion to the cylinder block independent circulation path, the second passage from the cylinder head downstream flow path section to the cylinder block flow path outlet A fourth control valve capable of distributing circulating fluid to a cylinder block downstream flow path portion reaching the suction port of the pump may be provided, and the independent formation of the cylinder block independent circulation path may be controlled by the fourth control valve. . This configuration corresponds to the fourth embodiment of the present application.
[0029]
In this configuration, a state in which the cylinder block single circulation path is formed independently while the fourth control valve stops the circulation of the circulating fluid between the cylinder head side circulation path and the cylinder block single circulation path is realized.
On the other hand, in a state where the fourth control valve allows the circulation of the circulating fluid between the cylinder head side circulation path and the cylinder block independent circulation path, the suction of the circulating fluid occurs from the cylinder head side circulation path by the action of the second pump. In addition, discharge from the cylinder block independent circulation path to the cylinder head side circulation path also occurs.
As a result, the control state of the fourth control valve, which has been described so far, realizes the warm-up by using the state in which the cylinder block independent circulation path is formed independently, and suppresses the temperature drop of the cylinder block after the warm-up. When the inflow and the outflow between the two circulation paths are allowed, appropriate execution of cooling by the function of the circulating liquid cooling mechanism and appropriate setting of the temperatures on the cylinder head side and the cylinder block side can be realized.
[0030]
As described above, the vehicle engine cooling device according to the present invention, as described in claim 4, controls the independent formation of the cylinder block independent circulation path with respect to the cylinder head side circulation path or the cylinder head side circulation path. By controlling the inflow and discharge of the circulating fluid between the circulation path and the cylinder block single circulation path, the temperature of the circulating liquid flowing in the cylinder head side circulation path and the temperature of the circulating liquid flowing in the cylinder block single circulation path are made independent. Can be set to
[0031]
Here, based on the relationship between the temperature of the circulating fluid flowing in the cylinder head side circulation path and the temperature of the circulating fluid flowing in the cylinder block single circulation path, the independent formation of the cylinder block single circulation path is further performed. If the configuration is adopted in which the inflow and discharge of the circulating fluid in the cylinder head is controlled, the cylinder block independent flow path is formed at the time of warm-up, and the cylinder head side when the cylinder head side is lower in temperature than the cylinder block side after warm-up The temperature of the cylinder block from dropping by suppressing the inflow of circulating fluid from the cylinder block to the cylinder block, and the proper flow of circulating fluid from the cylinder head to the cylinder block when the cylinder head is hotter than the cylinder block Of the cylinder head and cylinder block when the engine load is high. The Regulation of cooling the cylinder head and cylinder block side by a proper distribution of 却能 can be appropriately set while looking at the temperature relationship of each part.
[0032]
In the configuration corresponding to the first or third embodiment, if the second pump is a variable displacement pump, the operation setting of the second pump, in conjunction with the setting of the first control valve and the check valve, The selection of the circulation state according to the load state can be easily realized.
[0033]
By adopting a configuration in which the cylinder block single circulation path is provided in the cylinder block of the vehicle engine, heat generated in the cylinder block can be effectively used for raising the temperature of the cylinder block.
[0034]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present application is configured to have the first to fourth embodiments, and is configured such that the cylinder head side circulation path Ch and the cylinder block single circulation path Cid referred to in the present application can be formed independently. , Having that characteristic.
[0035]
(Basic configuration)
First, a basic structure common to all embodiments will be described.
This will be described with reference to FIG.
Cylinder head passage / cylinder block passage
The cooling device 1 for a vehicle engine is provided with a cylinder head internal flow path Fh provided in the engine cylinder head SH and a cylinder block internal flow path Fb provided in the cylinder block SB independently of each other. . Here, being independent means that the two flow paths Fh and Fb do not directly communicate between the flow path intermediate portions between the inflow port and the outflow port as seen in the conventional example shown in FIG. means.
[0036]
Circulating fluid cooling mechanism
The mechanism RO is a mechanism that enables the circulating fluid circulated through the mechanism to be cooled by heat exchange with the outside air.
This mechanism is provided with a so-called radiator R and a bypass path RB that bypasses the radiator R, and a thermostat valve TSV is provided downstream of the radiator R at a junction with the bypass path RB. The temperature of the circulating liquid flowing to the first pump P1 side is set to a predetermined temperature range. The radiator R includes a fan Rf, and cools the circulating fluid as the fan Rf rotates.
[0037]
In this configuration, the temperature of the circulating fluid sent to the first pump P1 is adjusted with the thermostat valve TSV in the open state. That is, the temperature of the circulating fluid flowing from the radiator R into the valve TSV is different from the temperature of the circulating fluid flowing from the bypass RB into the valve TSV. Degree is determined by state.
[0038]
Basically, when the circulating fluid temperature is equal to or lower than a predetermined temperature (for example, 80 ° C.), the circulating fluid is mainly flown to the bypass side, and the flow path is set so that the circulating fluid is not cooled by heat exchange with the atmosphere. .
When the circulating fluid temperature becomes higher than the predetermined temperature, the temperature difference reduces the flow rate to the bypass side and increases the flow rate to the radiator side to adjust the temperature of the circulating fluid flowing out of the valve TSV. I do.
When the heat load is high, the entire amount is sent to the radiator side to cool the circulating fluid with the maximum capacity.
[0039]
Cylinder head side circulation path
The circulation path Ch is provided as a circulation path passing through the first pump P1, the cylinder head internal flow path Fh, and the circulating liquid cooling mechanism RO.
Generally, the first pump P1 is a mechanical pump that obtains its driving force from an engine, and corresponds to the so-called water pump described above.
By circulating the circulating liquid in the circulation path, the cylinder head SH can be cooled.
[0040]
Cylinder block independent circulation path
This circulation path Cid is a circulation path provided for the purpose of preventing cooling of the cylinder block SB in a predetermined operation state, and circulating fluid circulates between the second pump P2 and the cylinder block flow path Fb. It is a circuit. In a state in which the single circulation path Cid is formed, the circulating fluid discharged from the second pump P2 flows into the cylinder block flow path Fb, and the circulating fluid flowing out of the cylinder block flow path Fb flows through the cylinder block flow path Fb. It returns to the suction port P2i of the two pumps P2.
[0041]
The circulation path Cid is provided with an inflow-side connection path 2i for causing inflow of circulating fluid from the cylinder head-side circulation path Ch and a discharge-side connection path 2o for causing discharge in a predetermined operation state. Have been.
The flow of the circulating fluid in these connection paths 2i and 2o is controlled by a control valve V (first control valve V1, second control valve V2, third control valve V3, fourth control valve) provided for the cylinder block single circulation path Cid. V4), depending on the operating state of the second pump P2.
[0042]
The second pump P2 is a so-called electric pump in the first, third, and fourth embodiments, and is a mechanical pump in the second embodiment. In the case of the first and third embodiments, the capacity may be variable, and in the case of the second and fourth embodiments, the capacity may be constant.
[0043]
The first, second, and fourth control valves V1, V2, and V4 are so-called three-way valves capable of controlling a flow rate, and the third control valve V3 is a check valve. In the case of the present application, the flow control of the three-way valve is in accordance with the temperature of the circulating fluid flowing through the cylinder head side circulation path Ch, the cylinder block independent circulation path Cid, or both.
The branch connection structure of each control valve V will be described in the respective embodiments.
[0044]
[Overview of First to Fourth Embodiments]
The first and second embodiments are characterized in that the inflow of the circulating fluid from the cylinder head side circulation path Ch to the cylinder block independent circulation path Cid is caused by the flow between the first pump P1 and the cylinder head internal flow path Fh. That is, the processing is executed from the cylinder head upstream flow path portion Fhu which is a road portion.
Here, in the first embodiment, as shown in FIG. 1, a first control valve V1 is provided in an inflow-side connection path 2i that is a connection portion between the two circulation paths Ch and Cid, and the first control valve V1 The formation of the cylinder block independent circulation path Cid is controlled.
[0045]
On the other hand, in the second embodiment, as shown in FIG. 3, the first pump P1 and the second pump P2 have an integrated structure, and the discharge port P1o of the first pump P1 and the suction port of the second pump P2. P2i is connected via the inter-pump connection path Pp, and a part of the discharge circulating fluid is sucked into the second pump P2 and flows into the cylinder block independent circulation path Cid.
Further, in this example, the second control valve V2 is provided on the discharge side, and similarly, the formation of the cylinder block single circulation path Cid is controlled under the control state of the second control valve V2.
This example is also characterized in that all the cylinder block independent circulation paths Cid are formed in the cylinder block SB of the vehicle engine.
[0046]
On the other hand, in the third and fourth embodiments, the inflow of the circulating fluid from the cylinder head side circulation channel Ch to the cylinder block independent circulation channel Cid causes the communication between the cylinder head internal channel Fh and the circulating fluid cooling mechanism RO. The flow is executed from the downstream flow path portion Fhd of the cylinder head, which is the flow path portion therebetween. That is, the circulating fluid warmed on the cylinder head side in a predetermined operation state flows into the cylinder block side.
[0047]
The feature of the third embodiment is that, as shown in FIG. 7, a relief structure is employed in which a circulating fluid is released from the cylinder block independent circulation path Cid to the cylinder head side circulation path Ch at a fluid pressure equal to or higher than a predetermined pressure. It is in. For this purpose, a check valve as the third control valve V3 is provided.
[0048]
In the fourth embodiment, as shown in FIG. 9, a fourth control valve V4 is provided at a downstream flow path portion from the cylinder head internal flow path Fh to the circulating fluid cooling mechanism RO, and the fourth control valve V4 is provided. The operation of the control valve V4 controls the formation of the cylinder block independent circulation path Cid.
[0049]
Further, the temperature of the circulating fluid flowing through the flow path Fh in the cylinder head and the temperature of the circulating fluid flowing through the flow path Fb in the cylinder block are detected, and the fourth control valve V4 is controlled in accordance with the temperature relationship to thereby control the cylinder block. The formation of the single circulation path Cid is controlled.
[0050]
Hereinafter, each embodiment will be described from the viewpoint of the configuration, the driving operation, and the like.
The description of the common configuration described above is omitted.
[0051]
[First embodiment]
B Configuration
As shown in FIG. 1, a cylinder head upstream side flow path portion Fhu extending from the first pump P <b> 1 to the cylinder head internal flow path Fh and a cylinder forming a cylinder block single circulation path Cid that constitute a cylinder head side circulation path Ch. An inflow-side connection path 2i is provided between the flow path Fb in the block and a flow path portion Fbd on the cylinder block downstream from the suction port P2i of the second pump P2. A first control valve V1 is provided at a junction with the flow path section Fbd.
The first control valve V1 shuts off the inflow-side connection path 2i in a state where the circulating fluid circulates in the cylinder block single circulation path Cid, and the suction port P2i of the second pump P2 from the cylinder block flow path outlet Fbo. The return of the circulating fluid to the tank is possible. That is, the first return path B1 is provided from the flow path outlet Fbo in the cylinder block to the inlet of the first control valve V1. Here, a part of the first return path B1 is a pipe outside the cylinder of the engine.
[0052]
As described above, the second pump P2 is of a variable displacement type. The establishment of the cylinder block independent circulation path Cid is controlled according to the discharge amount of the pump P2 and the control state of the first control valve V1.
[0053]
On the other hand, a flow path portion Fbd on the downstream side of the cylinder block from the outlet Fbo of the flow path Fb in the cylinder block to the suction port of the second pump P2 to the flow control port of the first control valve V1 that is not connected to the flow-in side connection path. And a discharge-side connecting passage 2o connecting a cylinder head downstream flow passage portion Fhd from the outlet Fho of the cylinder head internal flow passage Fh to the inlet ROi of the circulating liquid cooling mechanism RO.
[0054]
B Operation
In the following description of the operation, a thick solid line indicates a situation in which the circulating fluid is flowing, and a broken line indicates a situation in which the circulating fluid is partially flowing (thick and thin broken lines indicate the amount of the circulating fluid, and are thick). Are relatively large), and the thin solid line indicates a situation in which substantially no flow occurs.
During warm-up
FIG. 2A is a schematic diagram showing the flow of the circulating liquid during warm-up.
During warm-up, the first control valve V1 switches the flow path so that heat generated by combustion in the cylinder block SB is not deprived as much as possible by the circulating fluid flowing through the flow path Fb in the cylinder block, and the inflow-side connection path 2i is closed. By shutting off, the cylinder block independent circulation path Cid is formed, and the circulation liquid is independently circulated through the circulation path Cid by the electric pump as the second pump P2. In this state, the second pump P2 is in the operating state, the first control valve V1 is in the shut-off state of the inflow port to which the inflow-side connection path 2i is connected, and the inflow port and the outflow port forming the cylinder block downstream flow path portion Fbd are closed. The outlet is in communication.
[0055]
In this state, the circulating fluid discharged from the water pump, which is the first pump P1, flows through the cylinder head-side circulation channel Ch and flows only through the cylinder head. At this time, the thermostat valve TSV is controlled so that the circulating fluid flows only to the bypass passage RB. That is, during warm-up, heat generated by the engine is maintained as much as possible.
[0056]
At low / medium load
As shown in FIG. 2B, even in this state, the substantially independent circulation state of the circulating fluid between the cylinder head side circulation path Ch and the cylinder block single circulation path Cid is maintained. However, a part of the circulating liquid is allowed to flow in from the cylinder head side circulation path and to be discharged to the cylinder head side circulation path. That is, in this state, the second pump P2 is in the operating state, and the first control valve V1 is connected to the opening of the inflow port to which the inflow-side connecting path 2i is connected and the inflow port forming the cylinder block downstream flow path portion Fbd. The opening degree of communication between the outlets is adjusted to allow a part of the circulating fluid to flow.
Therefore, the temperature rising state on the cylinder block side is maintained, and mechanical friction and the like in the engine are suppressed.
[0057]
However, when the temperature of the circulating fluid in the cylinder head-side circulation channel rises and reaches the set temperature of the thermostat valve TSV, the circulating fluid supplied from the first pump P1 passes through the bypass passage RB in the circulating fluid cooling mechanism RO. Flows into the radiator R and receives a predetermined amount of cooling. Therefore, the temperature rise on the cylinder head side is suppressed.
[0058]
At high load / when adjusting cylinder block water temperature
As shown in FIG. 2 (c), in this state, the circulation system is configured so as to exhibit the high cooling capacity of the radiator R. That is, in the circulating fluid cooling mechanism RO, the circulating fluid is turned to the radiator side as much as possible, so that heat exchange with the atmosphere is exerted as close as possible.
Further, the discharge amount of the second pump P2 is set to be high, and the amount of liquid circulated between the circulating liquid cooling mechanism RO and the engine is set to be high.
Furthermore, the state of the first control valve V1 is such that the circulating fluid flows from the inflow-side connecting passage 2i into the cylinder block single circulation path in a state where the circulating fluid circulates in the cylinder block single circulation path Cid. To allow discharge from the discharge-side connection path 2o. That is, the relationship between the opening degree of the inflow side of the first control valve V1 to which the inflow side connection path 2i is connected and the communication opening degree of the inflow port and the outflow port forming the cylinder block downstream flow path portion Fbd is as described above. Is adjusted so that the former side becomes larger than at the time of low / medium load, allowing a relatively large amount of circulating fluid to flow.
[0059]
As a result, when the internal temperature of the engine rises and, for example, the temperature of the circulating fluid flowing through the cylinder block passage Fb becomes 90 ° C. or higher, the circulating fluid discharged from the first pump P1 also flows to the cylinder block SB. The first control valve V1 is controlled so that the temperature of the circulating fluid flowing through the cylinder block SB does not rise above a predetermined temperature.
[0060]
[Second embodiment]
B Configuration
As shown in FIG. 3, also in this example, a second pump P2 is provided, and a cylinder block single circulation path Cid, which is a circulation path between the second pump P2 and the cylinder block flow path Fb, is formed. There is no change in the possible configuration.
[0061]
By the way, in this example, the first pump P1 and the second pump P2 are of an integral type, and a pump between the discharge port P1o of the first pump P1 and the suction port P2i of the second pump P2 is connected. A connection path Pp is provided. Therefore, the first pump P1 and the second pump P2 have a tandem structure, and the drive shaft Pa is coaxially integrated.
The specific configuration around the first and second pumps P1 and P2 is shown in FIGS.
[0062]
By employing this structure, part of the circulating fluid discharged from the first pump P1 is introduced into the cylinder block single circulation path Cid via the inter-pump connection path Pp. That is, the inter-pump connection path Pp becomes the inflow-side connection path 2i described above. The other part of the circulating liquid discharged from the first pump P1 is sent to the cylinder head internal flow path Fh and circulates in the cylinder head side circulation path Ch.
[0063]
Now, a second control valve V2 is provided in the second return flow path 5 which reaches the suction port P2i of the second pump P2 on the return side of the flow path Fb in the cylinder block. One outlet V2o is connected to the cylinder head downstream flow path portion Fhd, and is configured to be able to discharge the circulating fluid to the cylinder head side circulation path Ch by the second control valve V2.
That is, one outlet V2o of the second control valve V2 is connected to the discharge-side connecting passage 2o.
[0064]
In this structure, the amount of the circulating fluid flowing into the cylinder block single circulation path is determined according to the branch flow state in the second control valve V2. A state in which circulates is also realized.
[0065]
B Operation
During warm-up
During the warm-up shown in FIG. 6A, only the inflow port and the outflow port of the second control valve V2 which form the cylinder block independent circulation path are connected. The outlet connected to the discharge side connection path 2o is shut off. As a result, the inflow of the circulating fluid from the inflow-side connecting passage 2i is interrupted when the circulating fluid pressure in the cylinder block single circulating passage rises to a predetermined pressure.
[0066]
Therefore, the circulating fluid discharged from the first pump P1 passes through the cylinder head SH, passes through the circulating fluid cooling mechanism RO, and returns to the pump P1. That is, the circulating liquid flows in the cylinder head side circulation path.
[0067]
On the cylinder block side, circulating fluid flows through the cylinder block independent circulation path Cid by the second control valve V2. No discharge to the cylinder head side is performed. That is, the internal circulation in the cylinder block single circulation path Cid (that is, in the cylinder block SB) is performed by the second pump P2. Therefore, the heat generated in the cylinder block SB contributes to the temperature rise in this portion, and quickly realizes warm-up.
[0068]
In this state, when the temperature of the circulating fluid flowing in the cylinder head SH rises and reaches, for example, 80 ° C., which is the set temperature of the thermostat valve TSV, in the circulating fluid cooling mechanism RO, the bypass passage RB and the radiator R The thermostat valve TSV is controlled so as to branch and flow.
[0069]
At low / medium load
As shown in FIG. 6 (b), in a low / medium load state after the warm-up, the temperature of the circulating fluid flowing through the cylinder head SH is maintained at, for example, 90 ° C. by the thermostat valve TSV and circulates through the cylinder block SB. The circulating fluid temperature is maintained at, for example, 100 ° C. by the second control valve V2. These temperatures naturally vary from engine to engine. However, the temperature is higher than the temperature setting during warm-up described above.
[0070]
That is, the circulating fluid flowing in the cylinder head side circulation channel Ch is maintained in a state where cooling by the circulating fluid cooling mechanism RO does not significantly occur.
On the other hand, with respect to the cylinder block single circulation path Cid, the amount of circulating fluid discharged to the cylinder head side via the discharge side connection path 2o depends on the control state of the second control valve V2. The restriction by the opening degree control also limits the amount of circulating fluid flowing into the circulation path, so that the cylinder block SB is not significantly cooled, and cooling by the radiator R is mainly performed by cooling the cylinder head SH. Will be used.
[0071]
In this operation state, since the suction port P2i of the mechanical pump as the second pump P2 is connected to the discharge port P1o of the mechanical pump as the first pump P1, the suction port P2i is in the circulation path in the cylinder block SB. Is switched so that a part of the circulating fluid flowing out of the second control valve V2 flows to the discharge side communication path 2o, the circulating fluid in the cylinder block SB is automatically By being discharged, the cylinder block SB is quickly adjusted to a predetermined temperature.
That is, the temperature of the circulating fluid in the cylinder block SB can be controlled to a predetermined temperature depending on the state of the second control valve V2.
[0072]
At high load
As shown in FIG. 6 (c), in this state, the cooling capacity on the radiator side can be exerted to near the maximum, and the amount of circulating fluid circulating between the radiator R and the engine is close to the maximum. To do it.
That is, the setting of the thermostat valve TSV makes the partial flow rate of the circulating fluid to the radiator side as close to the maximum as possible, and the setting of the second control valve V2 determines the inflow of the circulating fluid from the first pump P1 to the second pump P2. Is set so that the amount required for cooling the cylinder block SB is generated, and further, the setting is made such that the discharge occurs. The degree of opening adjustment of the outlet of the second control valve V2 is determined by the relationship between the degree of opening of the outlet on the return side to the second pump P2 and the degree of opening of the outlet connected to the discharge-side connection path 2o. The latter is made relatively high with respect to the state at the time of low and medium load described above, so that a relatively large amount of circulating fluid is discharged and also the inflow from the first pump P1 side occurs.
[0073]
As a result, the inside of the cylinder head SH and the inside of the cylinder block SB are appropriately cooled, but, for example, the circulating fluid temperature in the cylinder block SB and the circulating fluid temperature in the cylinder head SH are relatively smaller than the latter. It is possible to control a higher one, that is, a different state.
[0074]
C effect
As a result, according to the configuration of this embodiment, the circulating fluid temperature in the cylinder block SB can be maintained at a high temperature in any operating state without making a significant change to the configuration of the conventional cooling system, and the cylinder head SH Can be controlled to the required optimum temperature.
[0075]
Further, since an independent circulation path is provided in the cylinder block SB, the flow rate between the cylinder block SB and the cylinder block SB is reduced as compared with a conventional structure in which the flow rate on the cylinder block SB side is reduced. Therefore, the temperature of the circulating fluid on the cylinder block SB side can be set higher than before, and the effect of reducing the mechanical friction of the engine and improving the combustion can be increased.
[0076]
In addition, since the first pump P1 and the second pump P2 are driven mechanically and coaxially (tandem type), the number of bearings and circulating fluid seals can be reduced, so that friction can be reduced and the number of parts can be reduced. It becomes.
[0077]
[Third embodiment]
B Configuration
Even in this configuration, the cylinder block single circulation path Cid can be formed independently of the cylinder head side circulation path Ch.
However, in comparison with those shown in FIGS. 1 and 2, both the inflow-side connection path 2i and the discharge-side connection path 2o are located in the stated order on the downstream side of the cylinder head internal flow path. Therefore, the circulating fluid whose temperature has been raised via the cylinder head internal flow path Fh is led to the cylinder block side.
[0078]
More specifically, as shown in FIG. 7, the cylinder block downstream flow path portion Fbd from the cylinder block internal flow path Fb forming the cylinder block independent circulation path Cid to the second pump P2 is branched, and It is connected to a cylinder head downstream flow path portion Fhd from the flow path Fh in the cylinder head to the circulating liquid cooling mechanism RO via the connection path 2i.
A discharge-side connection passage 2o is provided downstream of the cylinder-head-side circulation passage Ch with respect to the inflow-side connection passage 2i. That is, the discharge-side connection path 2o is connected to the cylinder block upstream-side flow path portion Fbu between the discharge port P2o of the second pump P2 and the inflow port Fbi of the cylinder block flow path Fb. Is provided with a check valve V3. The check valve V3 allows the flow of the circulating fluid from the cylinder block independent circulation path Cid into the cylinder head side circulation path Ch, and prohibits the flow in the reverse direction.
[0079]
Therefore, when the discharge amount of the variable pump, which is the second pump P2, is increased to increase the circulation amount of the circulating fluid in the cylinder block independent circulation path Cid, the check valve V3 is set. In relation to this, when the pressure exceeds the predetermined pressure, discharge to the cylinder head side circulation path Ch side and suction into the independent circulation path Cid occur.
That is, the amount of the circulating liquid circulating in the circulation path is controlled, and as a result, the temperature of the cylinder block SB can be appropriately controlled.
[0080]
B Operation
During warm-up and after warm-up / low to medium load
As shown in FIG. 8A, during warm-up, the situation is substantially the same as that shown in FIG. 2A, and the cylinder head side circulation path Ch and the cylinder block single circulation path Cid are formed independently, The discharge from the block side to the cylinder head side and the inflow from the cylinder head side to the cylinder block side do not occur.
[0081]
In this state, the discharge rate of the second pump P2 is adjusted to a discharge rate at which the circulating fluid does not flow from the cylinder head side circulation path Ch to the cylinder block side single circulation path Cid via the inflow side connection path 2i. I do. The discharge through the check valve V3 does not occur due to the relationship between the discharge amount and the set pressure of the valve.
[0082]
That is, the circulating fluid flowing in the cylinder block SB is substantially circulated only in the cylinder block independent circulation path Cid by the electric pump as the second pump P2, and serves to speed up the warm-up of the cylinder block SB. , Serves to prevent the temperature of the cylinder block SB from dropping. As a result, mechanical friction that may occur in the engine is reduced, combustion is improved, and a good operating state is realized.
[0083]
In this state, when the discharge amount of the second pump P2 is increased, the discharge of the circulating fluid through the discharge side connection passage 2o occurs when the discharge pressure exceeds the set pressure of the check valve V3, and the cylinder block SB Since the amount of circulating fluid flowing through the inside is insufficient, the circulating fluid flows in (suctions) from the cylinder head side circulation channel Ch via the inflow side connection channel 2i so as to compensate for this shortage. Therefore, at a medium load, a part of the circulating fluid is allowed to flow in and out in a state where the circulating fluid is circulated in the cylinder block single circulation path as shown in FIG.
[0084]
After warm-up / high load
As shown in FIG. 8 (c), at the time of high load after warm-up, an operation operation is performed to maximize the cooling capacity of the radiator R and to make the circulation amount of the circulating fluid close to the maximum. You.
Therefore, the discharge amount of the second pump P2 is further increased from that at the time of medium load, and the discharge of the circulating fluid from the discharge side connecting passage 2o is further promoted, and the circulating fluid further flows into the cylinder block independent circulation passage Cid. To do.
[0085]
That is, the circulation of the circulating fluid in the cylinder head side circulation path Ch is as described above, but the cylinder block single circulation path Cid side is different.
[0086]
Explaining the cylinder block side, as for the circulating fluid flowing in the cylinder block SB, when the circulating fluid temperature rises due to a high load on the vehicle engine, the discharge amount of the electric pump as the second pump P2 further increases. Is done.
Accordingly, the hydraulic pressure of the circulating fluid flowing in the cylinder block SB further increases, the check valve V3 opens, and the discharge amount further increases via the discharge side connection path 2o.
At this time, the temperature of the circulating fluid flowing through the cylinder head SH is lower than the temperature of the circulating fluid flowing out from the inside of the cylinder block SB, so that the temperature of the circulating fluid flowing through the cylinder block SB can be reduced.
[0087]
Also in this case, the amount of inflow / outflow into / from the cylinder block single circulation path Cid can be arbitrarily set from the relationship between the discharge amount of the second pump P2, the set pressure of the check valve V3, and the like. The circulating fluid temperature in the cylinder head SH is controlled independently of the circulating fluid temperature in the cylinder block SB.
[0088]
[Fourth embodiment]
B Configuration
Even in this configuration, the cylinder block single circulation path Cid can be formed independently of the cylinder head side circulation path Ch. Similarly, as shown in FIG. 7, the inflow-side connection path 2i and the discharge-side connection path 2o are both connected in the stated order to the downstream side of the cylinder head internal flow path, and are connected via the inflow-side connection path 2i. The circulating fluid whose temperature has been raised via the cylinder head internal flow path Fh is guided to the cylinder block side.
[0089]
The difference between the third embodiment and the third embodiment will be described. As shown in FIG. 9, as shown in FIG. The fourth control valve V4 capable of distributing the circulating fluid to the circulation path Cid is provided.
[0090]
The fourth control valve V4 receives the circulating fluid flowing out of the cylinder head internal flow path Fh from the inflow port V4i, flows out from one outflow port V4o1 to the circulating fluid cooling mechanism RO side, and receives the circulating fluid from the other outflow port V4o2. In addition, it is configured to flow out to the cylinder block single circulation path Cid side. The other outlet V4o2 is connected to the inflow-side connection path 2i. The other end of the inflow-side connection path 2i is connected near the suction port P2i of the second pump P2.
[0091]
On the other hand, a discharge-side connecting passage 2o is connected from the vicinity of the discharge port P2o of the second pump P2, and in a situation where a predetermined amount or more of the circulating fluid circulates in the cylinder block single circulation passage Cid, the circulating fluid is discharged. A configuration in which discharge occurs is employed.
[0092]
The second pump P2 is independently provided outside the cylinder block SB.
[0093]
In this example, a cylinder head circulating fluid temperature sensor Th for detecting the temperature of the circulating fluid flowing in the cylinder head SH, and a cylinder block circulating fluid temperature sensor for detecting the temperature of the circulating fluid flowing in the cylinder block SB. Tb is provided.
The detection results obtained by these temperature sensors Th and Tb are used for split control of the fourth control valve V4, as described later.
[0094]
B Operation
During warm-up
As shown in FIG. 10 (a), during warm-up, the cylinder head side circulation path Ch and the cylinder block single circulation path Cid are formed independently as in the above-described embodiments, and the cylinder block SB Quick warm-up is possible. In this state, in the fourth control valve V4, only the inflow port and the outflow port (V4i, V4o1) forming the cylinder head side circulation path Ch communicate with each other, and the outflow port V4o2 to which the inflow side connection path 2i is connected is shut off. Is done.
[0095]
Then, similarly to the example described above, when the temperature of the circulating fluid flowing in the cylinder head SH rises and reaches the set temperature, the thermostat valve TSV receives predetermined cooling in the circulating fluid cooling mechanism RO so as to receive predetermined cooling. Is diverted to the radiator side.
[0096]
After warm-up, low / medium load
In this embodiment, the detection information of the pair of temperature sensors Th and Tb described above is used by the fourth control valve V4 for selecting a flow path.
That is, in the low / medium load state after the warm-up, the fourth control valve V4 performs the following control depending on the relationship between the temperature of the circulating fluid flowing in the cylinder head SH and the temperature of the circulating fluid flowing in the cylinder block SB.
[0097]
When the cylinder head side is cooler than the cylinder block side
In this state, it is effective to maintain the cylinder block SB at a high temperature in order to reduce the mechanical friction. Therefore, as shown in FIG. Control is performed so that the circulating fluid flowing through the passage Ch does not flow into the cylinder block SB. That is, only the inlet and outlet (V4i · V4o1) forming the cylinder head side circulation path Ch, which is the control state of the fourth control valve V4 at the time of the previous warm-up, are communicated, and the inflow side connection path 2i is connected. The connected outlet V4o2 is kept in a shut-off state.
As a result, the circulating fluid flowing in the cylinder block SB can be maintained at a high temperature while the temperature of the circulating fluid flowing in the cylinder head SH is kept at an appropriate temperature.
[0098]
When the cylinder head side is hotter than the cylinder block side
This state occurs when the load state continues, but in this state, the circulating fluid temperature on the cylinder block SB side where the heat transfer of combustion is small becomes low, and therefore, as shown in FIG. The valve V4 controls the circulating fluid to flow into the cylinder block SB. That is, the control state of the fourth control valve V4 is set such that the inlet and the outlet (V4i · V4o1) forming the cylinder head side circulation path Ch communicate with each other, and the outlet V4o2 to which the inflow side connection path 2i is connected is partially connected. Communication state.
By doing so, the circulating fluid temperature on the cylinder block SB side can be led to a high temperature.
[0099]
High load after warm-up
When the load rises and the temperature of the circulating fluid flowing on the cylinder block SB side exceeds a predetermined value, as shown in FIG. 10D, the fourth control valve V4 removes the circulating fluid flowing on the cylinder side from the cylinder. Control is performed so as to flow into the block SB, and the upper limit of the temperature of the circulating fluid flowing through the cylinder block SB is controlled.
That is, in the state where the cylinder head side is higher in temperature than the cylinder block side after the warm-up / medium / low load described above, the outflow port V4o2 to which the inflow side connection path 2i is connected is determined from the control state of the fourth control valve V4. Is increased. In this state, the communication between the inflow port and the outflow port (V4i / V4o1) forming the cylinder head side circulation path Ch is maintained.
By doing so, the circulating fluid temperature on the cylinder block SB side can be guided to an appropriate temperature.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a configuration of a vehicle engine cooling device according to a first embodiment.
FIG. 2 is a diagram showing a circulation state of a circulating liquid according to the first embodiment.
FIG. 3 is a schematic configuration diagram illustrating a configuration of a vehicle engine cooling device according to a second embodiment.
FIG. 4 is a diagram showing a schematic configuration around a pump of a vehicle engine cylinder block according to a second embodiment;
FIG. 5 is a diagram showing an internal schematic configuration of a pump used in the second embodiment.
FIG. 6 is a diagram showing a circulation state of a circulating liquid according to a second embodiment.
FIG. 7 is a schematic configuration diagram showing a configuration of a vehicle engine cooling device according to a third embodiment.
FIG. 8 is a diagram showing a circulation state of a circulating fluid in a third embodiment.
FIG. 9 is a schematic configuration diagram showing a configuration of a vehicle engine cooling device according to a fourth embodiment.
FIG. 10 is a diagram showing a circulation state of a circulating fluid according to a fourth embodiment.
FIG. 11 is a schematic view showing an example of a conventional technique.
[Explanation of symbols]
1 Engine cooling system for vehicles
2i Inlet side connecting road
2o Discharge side connection path
Ch Cylinder head side circulation path
Cid cylinder block independent circulation path
Fb Cylinder block flow path
Fbd Cylinder block downstream flow path
Fbu Cylinder block upstream flow path
Fh Cylinder head flow path
Fhd Cylinder head downstream flow path
Fhu Cylinder head upstream flow path
P1 First pump
P2 Second pump
Pa drive shaft
Connection path between Pp pumps
R radiator
RB bypass
Rf fan
RO circulating fluid cooling mechanism
SB cylinder block
SH cylinder head
Tb cylinder block temperature sensor
Th cylinder head temperature sensor
TSV thermostatic valve
V control valve
V1 First control valve
V2 Second control valve
V3 Third control valve
V4 4th control valve

Claims (4)

The vehicle engine includes a cylinder block having a cylinder block flow path through which a circulating fluid flows, and a cylinder head having a cylinder head flow path through which a circulating fluid flows. Independently provided for the road,
A circulating liquid cooling mechanism capable of cooling the circulating liquid by heat exchange with outside air is provided,
A first pump that obtains driving force from an engine, the cylinder head flow path, a vehicle engine cooling device configured to be able to form a cylinder head side circulation path passing through the circulating liquid cooling mechanism,
A second pump is provided, and a cylinder block single circulation path in which circulating fluid circulates between the second pump and the cylinder block flow path is configured to be formed independently of the cylinder head side circulation path,
A vehicle configured to allow circulating fluid to flow from the cylinder head-side circulation path to the cylinder block-side circulation path and discharge circulating fluid from the cylinder block-side circulation path to the cylinder head-side circulation path. For engine cooling device. A cylinder head upstream flow path portion from the first pump to the cylinder head flow path, and a cylinder block downstream flow path portion from the outlet of the cylinder block flow path to the suction port of the second pump. A first control valve is provided in the inflow side connection path provided therebetween,
From the cylinder head upstream flow path portion to the cylinder block single circulation path, the inflow of the circulating fluid is enabled through the inflow side connection path depending on the control state of the first control valve,
The vehicle engine cooling device according to claim 1, wherein the first control valve controls the independent formation of the single cylinder block circulation path. The circulating fluid is allowed to flow into the cylinder block independent circulation path from the cylinder head downstream flow path section extending from the cylinder head internal flow path to the circulating liquid cooling mechanism through the inflow side connection path. The vehicle engine cooling device according to any one of the preceding claims. The cylinder head side circulation path is independently formed with respect to the cylinder head side circulation path, or the inflow and discharge control of the circulating fluid between the cylinder head side circulation path and the cylinder block single circulation path is controlled by the cylinder head side. The vehicle engine cooling device according to any one of claims 1 to 3, wherein the temperature of the circulating fluid flowing in the circulation path and the temperature of the circulating fluid flowing in the cylinder block single circulation path can be set independently.

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