JP2004301063A - Cooling device of engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device of an engine, efficiently recovering high-temperature refrigerant into a heat storage receptacle. <P>SOLUTION: This cooling device of an engine is provided with a cooling circuit including: a radiator passage for causing cooling water flowing out of the engine E to flow into the engine E through a radiator 12; a bypass passage for causing the cooling water flowing out of the engine E to flow into the engine E not through the radiator; and a flow control valve 22 for controlling the flow rate of cooling water circulating through the bypass passage, and a heat storage passage having the heat storage receptacle 16 storing the cooling water in the thermal insulating state and selectively connected to the cooling circuit to constitute a heat storage circuit. After warm-up of the engine E, the flow control valve 22 is opened to circulate the cooling water flowing out of the engine E to the bypass passage. When the temperature of the cooling water flowing out of the engine E is a predetermined temperature or higher, the flow control valve 22 is closed so that the cooling water flows into the heat storage receptacle 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an engine cooling device for cooling an engine through circulation of a refrigerant.
[0002]
[Prior art]
BACKGROUND ART As an engine cooling device that cools an engine through circulation of a refrigerant, a cooling device provided with a heat storage container is known. In such a cooling device, it is possible to store the refrigerant while keeping the temperature of the refrigerant by flowing the refrigerant having a high temperature due to the heat received from the engine into the heat storage container.
[0003]
As an engine cooling device provided with a heat storage container, for example, a device described in Patent Document 1 is known.
The cooling device described in the document, as a refrigerant circulation circuit,
[A] "Cooling provided with a radiator passage for returning the refrigerant flowing out of the engine main body to the engine main body via the radiator and a bypass passage for bypassing the refrigerant to the engine main body by bypassing the radiator. circuit"
[B] "A heat storage circuit provided with a heat storage container and provided with a heat storage passage for allowing the refrigerant stored in the heat storage container to flow into the engine body"
The circuit is provided with the circulation circuits of [A] and [B].
[0004]
Further, a control valve is provided in the bypass passage, and the open / close state of the bypass passage can be switched through control of the control valve.
In this cooling device for the engine, after the warm-up of the engine is completed, the cooling water is circulated while the bypass passage is opened, and the warm refrigerant is recovered into the heat storage container.
[0005]
[Patent Document 1]
JP-A-10-77839
[0006]
[Problems to be solved by the invention]
By the way, in a cooling device for an engine equipped with a heat storage container, the high-temperature refrigerant flowing out of the engine is stored in the heat storage container, and the next time the engine is started, the refrigerant is used to warm up the engine. It becomes possible to promote.
[0007]
Therefore, when the temperature of the refrigerant flowing out of the engine is high, it is desired to increase the flow rate of the refrigerant flowing into the heat storage container to increase the efficiency of recovering the refrigerant. If it is assumed that the bypass passage is opened after the completion of the warm-up, it becomes difficult to efficiently collect the high-temperature refrigerant.
[0008]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an engine cooling device capable of efficiently collecting a high-temperature refrigerant into a heat storage container.
[0009]
[Means for Solving the Problems]
Hereinafter, the means for achieving the above object and the effects thereof will be described.
The invention according to claim 1 is a radiator passage through which refrigerant flowing out of the engine main body flows into the engine main body via a radiator, and the engine flowing the refrigerant flowing out of the engine main body without passing through the radiator. A cooling passage including a bypass passage for flowing into the main body of the engine, a first control valve for controlling a flow rate of the refrigerant flowing through the bypass passage, and keeping the refrigerant flowing out of the engine main body warm. A heat storage passage for forming a heat storage circuit for circulating the refrigerant through the main body of the engine and the heat storage container by being selectively connected to the cooling circuit, the heat storage container being provided; After warming up, the first control valve is opened to allow the refrigerant flowing out of the engine body to flow through the bypass passage. A cooling means for closing the first control valve to allow the refrigerant to flow into the heat storage container when the temperature of the refrigerant flowing out of the main body of the engine is equal to or higher than a predetermined temperature. The gist is that.
[0010]
According to the above configuration, after the engine is warmed up, when the temperature of the refrigerant flowing out of the engine body is equal to or higher than the predetermined temperature, the refrigerant is recovered into the heat storage container with the first control valve closed. Is As described above, when the high-temperature refrigerant flowing out of the engine body is collected in the heat storage container, the flow rate of the refrigerant flowing into the heat storage container is increased by closing the bypass passage. Can be efficiently recovered into the heat storage container.
[0011]
According to a second aspect of the present invention, in the cooling device for an engine according to the first aspect, the cooling circuit further includes a second control valve for controlling a flow rate of a refrigerant flowing through the radiator passage, and the control means. The gist of the invention is to close the second control valve when the first control valve is closed and the refrigerant flowing out of the main body of the engine flows into the heat storage container.
[0012]
According to the above configuration, when the refrigerant is recovered into the heat storage container in a state where the first control valve is closed, the second control valve is closed. As described above, when the high-temperature refrigerant flowing out of the engine is collected in the heat storage container, the flow rate of the refrigerant flowing into the heat storage container is increased by closing the radiator passage. The efficiency can be further improved.
[0013]
According to a third aspect of the present invention, in the cooling device for an engine according to the first or second aspect, the control means cannot recover the refrigerant flowing out of the main body of the engine during the operation of the engine into the heat storage container. The gist is that the refrigerant flowing out of the main body of the engine is caused to flow into the heat storage container while the first control valve is closed while the engine is stopped.
[0014]
According to the above configuration, when the refrigerant flowing out of the main body of the engine is not recovered into the heat storage container during the operation of the engine, the first control valve (the first control according to the first aspect of the present invention) is stopped while the engine is stopped. The valve, that is, the first control valve and the second control valve) is closed, and the refrigerant is recovered into the heat storage container. As described above, since the refrigerant is collected while the engine is stopped, the warm refrigerant can be collected into the heat storage container as much as possible. Further, by closing the bypass passage (further, the radiator passage in the case of the second aspect of the invention), the flow rate of the refrigerant flowing into the heat storage container is increased, so that the warm refrigerant is efficiently transferred into the heat storage container. You will be able to collect well.
[0015]
According to a fourth aspect of the present invention, in the cooling device for the engine according to the third aspect, the heater core for exchanging heat between the refrigerant flowing out of the main body of the engine and the air for heating the passenger compartment is provided. A heater circuit that is provided and that is selectively connected to the cooling circuit to form a heater circuit for circulating the refrigerant through the main body of the engine and the heater core. A connection mode of the heater passage to the circuit is controlled, and when the refrigerant flowing out of the main body of the engine flows into the heat storage container during operation of the engine, the heater passage is kept connected to the cooling circuit. On the other hand, when the refrigerant flowing out of the main body of the engine during the stop of the engine is allowed to flow into the heat storage container, Are summarized as cutting the over data paths from said cooling circuit.
[0016]
According to the above configuration, when the refrigerant flowing out of the main body of the engine is recovered in the heat storage container during operation of the engine, the heater passage is maintained in a state connected to the cooling circuit. On the other hand, when the refrigerant flowing out of the main body of the engine is collected in the heat storage container while the engine is stopped, the heater passage is kept disconnected from the cooling circuit. As described above, when the refrigerant is recovered into the heat storage container during the operation of the engine, the high-temperature refrigerant is supplied to the heater core, so that a decrease in the heater performance can be suitably suppressed. Further, when the refrigerant is recovered into the heat storage container while the engine is stopped, the flow rate of the refrigerant flowing into the heat storage container is increased by disconnecting the heat storage passage from the cooling circuit. The refrigerant can be efficiently collected in the heat storage container.
[0017]
According to a fifth aspect of the present invention, in the cooling device for an engine according to the fourth aspect, the control unit is configured to, when the refrigerant flowing out of the main body of the engine flows into the heat storage container during the operation of the engine, While maintaining the state where the heater passage is connected to the cooling circuit on condition that there is a request to flow the heater passage into the heater core, and disconnecting the heater passage from the cooling circuit when the condition is not satisfied. And
[0018]
According to the above configuration, when the refrigerant is recovered into the heat storage container during operation of the engine, the heater passage is connected to the cooling circuit on the condition that there is a request to cause the refrigerant flowing out of the main body of the engine to flow into the heater core. It is kept connected. On the other hand, when there is no request to make the refrigerant flowing out of the main body of the engine flow into the heater core, the heater passage is disconnected from the cooling circuit. As described above, when it is not necessary to cause the refrigerant to flow into the heater core, the flow rate of the refrigerant flowing into the heat storage container is increased through disconnection of the heater passage from the cooling circuit. Further improvement can be achieved.
[0019]
According to a sixth aspect of the present invention, in the cooling device for an engine according to any one of the first to fifth aspects, the cooling circuit causes the refrigerant flowing out of the main body of the engine to flow into the main body of the engine through a throttle body. And a control valve that closes the first control valve to transfer refrigerant flowing out of the engine body into the heat storage container. The gist of the invention is to close the on-off valve when inflowing.
[0020]
According to the above configuration, heat is stored in a state in which the first control valve (the first control valve according to the first aspect of the invention and the first control valve and the second control valve according to the second aspect of the invention) is closed. When the refrigerant is collected into the container, the on-off valve is closed. As described above, when the high-temperature refrigerant flowing out of the engine is recovered into the heat storage container, the flow rate of the refrigerant flowing into the heat storage container is increased through the closing of the throttle passage. Can be further improved.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
[0022]
FIG. 1 shows an overall configuration of an engine cooling device 1 having a cooling function of an engine E (engine main body).
First, the function of each component provided in the engine cooling device 1 will be described.
[0023]
The water pump 11 is driven through the engine E and pumps cooling water.
The radiator 12 performs heat exchange between the cooling water and the outside air.
[0024]
The throttle body 13 has a built-in throttle valve and adjusts the amount of intake air according to the opening of the valve.
The heater core 14 exchanges heat between the cooling water and the air for heating the vehicle interior (air for heating the interior of the vehicle) flowing through the heater 14H. The heat-exchanged air is supplied into the vehicle interior through the heater 14H.
[0025]
The electric water pump 15 is driven through a battery and pumps cooling water.
The heat storage container 16 stores the cooling water and insulates the cooling water from the air outside the container. As a result, the cooling water is stored in the heat storage container 16 while keeping the temperature.
[0026]
The cooling water delivery pipe 17 causes the cooling water flowing out of the heat storage container 16 to flow into the cylinder head of the engine E.
The thermostat 21 operates according to the temperature of the cooling water, and adjusts the flow rate of the cooling water flowing into the radiator 12. When the opening of the thermostat 21 is the minimum opening (fully closed), the flow rate of the cooling water flowing into the radiator 12 is “0”, and flows into the radiator 12 as the opening of the thermostat 21 approaches the maximum opening (fully opened). The flow rate of the cooling water is increased.
[0027]
The flow control valve 22 is capable of continuously changing the opening degree of the valve, and adjusts the flow rate of the cooling water in a flow passage (bypass passage) for bypassing the radiator 12 and circulating the cooling water. I do. When the opening of the flow control valve 22 is the minimum opening (fully closed), the flow rate of the cooling water flowing through the flow passage becomes “0”, and as the opening of the flow control valve 22 approaches the maximum opening (fully opened). The flow rate of the cooling water flowing through the flow passage increases.
[0028]
The opening / closing valve 23 can be switched to either valve opening or valve closing, and switches the flow of cooling water in a flow passage (throttle passage) for flowing the cooling water into the throttle body 13. When the on-off valve 23 is in the open state, the cooling water is supplied to the throttle body 13. On the other hand, when the on-off valve 23 is in the closed state, the cooling water is not supplied to the throttle body 13.
[0029]
The three-way valve 24 includes three ports (a first port P1, a second port P2, and a third port P3), and selectively switches the flow of the cooling water by changing the open / close state of each of these ports. .
[0030]
The electronic control unit (ECU) 3 controls the electric water pump 15, the flow control valve 22, the on-off valve 23, and the three-way valve 24 as a whole. The control means includes the ECU 3.
[0031]
Next, each sensor constituting the detection system of the engine cooling device 1 will be described. Each data detected through the detection system is input to the ECU 3.
The engine water temperature sensor S1 detects the temperature of the cooling water flowing out of the engine E (engine water temperature THwe).
[0032]
The heat storage container water temperature sensor S2 detects the temperature of the cooling water in the heat storage container 16 (heat storage container temperature THwt).
Next, the flow path of the cooling water in the engine cooling device 1 will be described.
[0033]
The first cooling passage R1 connects the engine E with the first port P1 of the three-way valve 24.
The second cooling passage R2 connects the engine E and the thermostat 21.
[0034]
The third cooling passage R3 connects the first cooling passage R1 and the radiator 12.
The fourth cooling passage R4 connects the radiator 12 and the thermostat 21.
The fifth cooling passage R5 connects the first cooling passage R1 and the flow control valve 22.
[0035]
The sixth cooling passage R6 connects the flow control valve 22 and the second cooling passage R2 via the thermostat 21. The sixth cooling passage R6 is communicated with the second cooling passage R2 regardless of the open / close state of the thermostat 21.
[0036]
The seventh cooling passage R7 connects the first cooling passage R1 and the on-off valve 23.
The eighth cooling passage R8 connects the on-off valve 23 and the throttle body 13.
The ninth cooling passage R9 connects the throttle body 13 and the second cooling passage R2 via the thermostat 21. The ninth cooling passage R9 communicates with the second cooling passage R2 regardless of the open / close state of the thermostat 21.
[0037]
The tenth cooling passage R10 connects the second port P2 of the three-way valve 24 and the heater core 14.
The eleventh cooling passage R11 connects the heater core 14 and the second cooling passage R2 via the thermostat 21. The eleventh cooling passage R11 communicates with the second cooling passage R2 regardless of the open / close state of the thermostat 21.
[0038]
The twelfth cooling passage R12 connects the third port P3 of the three-way valve 24 and the electric water pump 15.
The thirteenth cooling passage R <b> 13 connects the electric water pump 15 and the heat storage container 16.
[0039]
The fourteenth cooling passage R14 connects the heat storage container 16 and the delivery pipe 17 for cooling water.
Through each of the cooling passages, a radiator passage, a bypass passage, a throttle passage, a heater passage, and a heat storage passage described below are respectively formed. It should be noted that each of these cooling passages can be selectively switched between open and closed states through control of control valves (flow control valve 22, on-off valve 23, and three-way valve 24) provided in each of the cooling passages. Has become.
[0040]
[Radiator passage]
The third cooling passage R3 and the fourth cooling passage R4 constitute a radiator passage. The radiator passage is opened when the thermostat 21 is open, and is closed when the thermostat 21 is closed.
[0041]
When the radiator passage is open, the cooling water flows through the radiator 12.
[Bypass passage]
The fifth cooling passage R5 and the sixth cooling passage R6 constitute a bypass passage.
[0042]
The bypass passage is open when the flow control valve 22 is open, and is closed when the flow control valve 22 is closed.
When the bypass passage is open, the cooling water flows bypassing the radiator 12.
[0043]
[Throttle passage]
The seventh cooling passage R7, the eighth cooling passage R8, and the ninth cooling passage R9 form a throttle passage.
[0044]
The throttle passage is opened when the on-off valve 23 is open, and is closed when the on-off valve 23 is closed.
When the throttle passage is open, the cooling water flows through the throttle body 13.
[0045]
[Heater passage]
The tenth cooling passage R10 and the eleventh cooling passage R11 form a heater passage.
[0046]
The heater passage can be selectively connected to the first cooling passage R1 through the control of the three-way valve 24.
The heater passage is open when the first port P1 and the second port P2 of the three-way valve 24 are open, while the heater passage is in one of the first port P1 and the second port P2 of the three-way valve 24. Is closed when the valve is closed.
[0047]
When the heater passage is open, the cooling water flows through the heater core 14.
[Heat storage passage]
The twelfth cooling passage R12, the thirteenth cooling passage R13, and the fourteenth cooling passage R14 form a heat storage passage.
[0048]
The heat storage passage can be selectively connected to the first cooling passage R1 through the control of the three-way valve 24.
The heat storage passage is open when the first port P1 and the third port P3 of the three-way valve 24 are open, while one of the first port P1 and the third port P3 of the three-way valve 24 is open. Is closed when the valve is closed.
[0049]
When the heat storage passage is open, the cooling water flows through the heat storage container 16.
The above-mentioned respective cooling passages constitute the following respective circulation circuits for circulating the cooling water.
[0050]
[Cooling circuit]
First cooling passage R1, radiator passage (third cooling passage R3 and fourth cooling passage R4), bypass passage (fifth cooling passage R5 and sixth cooling passage R6), throttle passage (seventh cooling passage R7 to ninth cooling) A cooling circuit is configured by the passage R9) and the second cooling passage R2.
[0051]
The cooling circuit is open when at least one of the radiator passage, the bypass passage, and the throttle passage is open, and is closed when each of the cooling passages is closed.
[0052]
When the cooling water circulates through the cooling circuit, heat exchange is performed between the engine E and the cooling water.
When the cooling water circulates through the radiator passage, heat exchange is performed in the radiator 12 between the outside air and the cooling water.
[0053]
When the cooling water circulates through the bypass passage, heat radiation of the cooling water in the radiator 12 is suppressed.
When the cooling water circulates through the throttle passage, heat exchange is performed between the throttle body 13 and the cooling water.
[0054]
[Heat storage circuit]
The first cooling passage R1 and the heat storage passage (the twelfth cooling passage R12 to the fourteenth cooling passage R14) form a heat storage circuit.
[0055]
The heat storage circuit is opened when the heat storage passage is connected to the cooling circuit (first cooling passage R1), and is closed when the heat storage passage is disconnected from the cooling circuit.
[0056]
When the cooling water circulates through the heat storage circuit, heat exchange is performed between the cooling water stored in the heat storage container 16 and the engine E.
When the on-off valve 23 is open, heat exchange is performed between the cooling water stored in the heat storage container 16 and the throttle body 13.
[0057]
When the first port P1 and the second port P2 of the three-way valve 24 are open, heat exchange between the cooling water stored in the heat storage container 16 and the vehicle interior heating air in the heater core 14 is performed. Done.
[0058]
[Heater circuit]
The first cooling passage R1, the heater passage (the tenth cooling passage R10 and the eleventh cooling passage R11), and the second cooling passage R2 constitute a heater circuit.
[0059]
The heater circuit is opened when the heater passage is connected to the cooling circuit (first cooling passage R1), and is closed when the heater passage is disconnected from the cooling circuit.
[0060]
When the coolant circulates through the heater circuit, heat exchange is performed between the air for heating the vehicle interior and the coolant in the heater core 14.
By the way, in the engine cooling device 1, the high-temperature cooling water (hot water) flowing out of the engine E is stored in the heat storage container 16, and the next time the engine E is started, the hot water is used to start the engine cooling. The warm-up of E can be promoted.
[0061]
Therefore, when the temperature of the cooling water flowing out of the engine E is high, it is desirable to increase the flow rate of the cooling water flowing into the heat storage container 16 to efficiently collect the hot water into the heat storage container 16. When the cooling water is circulated with the bypass passage opened after the completion of the machine, it becomes difficult to efficiently collect the hot water.
[0062]
Therefore, in the present embodiment, in consideration of such a case, the recovery of the hot water into the heat storage container 16 is performed through the “hot water recovery process during engine operation” (FIG. 2) described below.
[0063]
[Hot water recovery processing during engine operation]
With reference to FIG. 2, the "hot water recovery processing during engine operation" will be described. Note that this processing corresponds to processing performed through the control unit.
[0064]
This processing is started after the warm-up of the engine E is completed, and is ended after the processing of steps S101 to S106 described below is performed.
[Step S101] It is determined whether or not the engine water temperature THwe is equal to or higher than a predetermined temperature (hot water recovery determination temperature THwX). That is, the following conditions
THwe ≧ THwX
It is determined whether or not is satisfied.
[0065]
When the engine water temperature THwe is lower than the hot water recovery determination temperature THwX, the above-described determination processing is repeatedly executed at predetermined intervals.
The hot water recovery determination temperature THwX is used as a threshold value of the engine water temperature indicating whether the cooling water flowing out of the engine E is in a high temperature state. That is, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the cooling water flowing out of the engine E is in a high temperature state.
[0066]
Incidentally, the hot water recovery determination temperature THwX can be set according to the warm-up performance required for the engine E, the heating performance required for the heater 14H, and the like.
[Step S102] When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, it is determined whether there is a heater request indicating that the heating function of the heater 14H is required (there is a request to flow hot water into the heater core 14) ( It is determined whether or not the heater request flag exHC is “ON”. That is, the following conditions
exHC = ON
It is determined whether or not is satisfied.
[0067]
The presence or absence of a heater request can be determined based on the temperature of the outside air, the amount of solar radiation, the temperature in the passenger compartment, the humidity in the passenger compartment, the ON / OFF state of the defogger switch, and the setting state of air conditioning.
[0068]
Incidentally, when there is a heater request, basically, the heater passage is maintained in a state of being connected to the cooling circuit.
[Step S103] When there is a heater request (when the heater request flag exHC is “ON”), the following operations [a] to [c] are performed.
[A] Open all ports of the three-way valve 24.
[B] The flow control valve 22 is fully closed.
[C] The on-off valve 23 is closed.
[0069]
Through these operations, the heat storage passage and the heater passage are connected to the cooling circuit (the heat storage passage and the heater passage are opened), while the bypass passage and the throttle passage are closed.
[0070]
Thereby, the cooling water circulates through the heat storage circuit, so that the warm water flowing out of the engine E flows into the heat storage container 16. That is, the hot water is collected into the heat storage container 16.
[0071]
Further, since the cooling water is circulated through the heater circuit, the warm water flowing out of the engine E flows into the heater core 14.
[Step S104] When the heater request flag exHC is “OFF”, the following operations [a] to [d] are performed.
[A] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B] The second port P2 of the three-way valve 24 is closed.
[C] The flow control valve 22 is fully closed.
[D] The on-off valve 23 is closed.
[0072]
Through these operations, the heat storage passage is connected to the cooling circuit (the heat storage passage is opened), while the bypass passage, the throttle passage, and the heater passage are closed.
Thereby, the cooling water circulates through the heat storage circuit, so that the warm water flowing out of the engine E is collected into the heat storage container 16.
[0073]
[Step S105] It is determined whether the period during which the hot water is collected in the heat storage container 16 (the hot water recovery period Pww) is equal to or longer than a predetermined recovery period PwwX. That is, the following conditions
Pww ≧ PwwX
It is determined whether or not is satisfied.
[0074]
When the hot water recovery period Pww is shorter than the predetermined recovery period PwwX, the above-described determination process is repeatedly executed at predetermined intervals.
Note that the predetermined recovery period PwwX is used as a threshold value of the hot water recovery period indicating whether the hot water flowing out of the engine E has been sufficiently recovered into the heat storage container 16. That is, when the hot water recovery period Pww is equal to or longer than the predetermined recovery period PwwX, a sufficient amount of hot water is stored in the heat storage container 16.
[0075]
Incidentally, the predetermined recovery period PwwX can be set according to the capacity of the heat storage container 16, the pump performance, and the like.
[Step S106] When the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX, the third port P3 of the three-way valve 24 is closed.
[0076]
Through this operation, the heat storage passage is disconnected from the cooling circuit.
As described above, according to the hot water recovery process during the operation of the engine, the hot water is recovered in the following modes [A] and [B].
[A] When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “ON”, the heat storage passage and the heater passage are maintained connected to the cooling circuit, while the bypass passage and the throttle passage are maintained. Keep closed and recover hot water.
[B] When the engine coolant temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “OFF”, the heat storage passage is maintained connected to the cooling circuit, while the bypass passage, the throttle passage, and the heater passage are maintained. Is kept closed to recover hot water.
[0077]
Here, with reference to FIG. 3, the control mode of the engine cooling device 1 by the hot water recovery process (FIG. 2) during the operation of the engine will be summarized.
When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “ON”, the engine cooling device 1 is controlled in the following modes [A1] to [A4].
[A1] The flow control valve 22 is fully closed.
[A2] The on-off valve 23 is closed.
[A3] All ports of the three-way valve 24 are opened.
[A4] The electric water pump 15 is stopped.
[0078]
When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “OFF”, the engine cooling device 1 is controlled in the following modes [B1] to [B4].
[B1] The flow control valve 22 is fully closed.
[B2] The on-off valve 23 is closed.
[B3] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B4] The second port P2 of the three-way valve 24 is closed.
[B5] The electric water pump 15 is stopped.
[0079]
Incidentally, the thermostat 21 is maintained at an opening corresponding to the temperature of the cooling water.
In the operation state other than the above, the flow control valve 22, the on-off valve 23, the three-way valve 24, and the electric water pump 15 are controlled according to the operation state of the engine E by a separate process.
[0080]
Next, with reference to FIG. 4 and FIG. 5, a circulation mode of the cooling water at the time of collecting the hot water during operation of the engine will be described. In FIGS. 4 and 5, the cooling passages indicated by solid lines indicate passages through which the cooling water flows, the arrows indicate the flow direction of the cooling water, and the cooling passages indicated by broken lines indicate passages through which the cooling water does not flow. .
[0081]
[Cooling water circulation mode [1]]
With reference to FIG. 4, the circulation mode of the cooling water when "the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is" ON "" will be described.
[0082]
At this time, since the heat storage passage and the heater passage are connected to the cooling circuit, the cooling water circulates through the first cooling passage R1, the heat storage passage, the heater passage, and the second cooling passage R2.
[0083]
When the thermostat 21 is in the open state, the cooling water circulates through the first cooling passage R1, the radiator passage, and the second cooling passage R2.
On the other hand, since the bypass passage and the throttle passage are closed, the cooling water does not flow through these cooling passages.
[0084]
[Cooling water circulation mode [2]]
With reference to FIG. 5, a description will be given of the circulation mode of the cooling water when "the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is" OFF "".
[0085]
At this time, since the heat storage passage is connected to the cooling circuit, the cooling water circulates through the first cooling passage R1 and the heat storage passage.
When the thermostat 21 is in the open state, the cooling water circulates through the first cooling passage R1, the radiator passage, and the second cooling passage R2.
[0086]
On the other hand, since the bypass passage, the throttle passage, and the heater passage are closed, the cooling water does not flow through these cooling passages.
Next, the operation and effect achieved by the hot water recovery process (FIG. 2) during operation of the engine will be described.
[0087]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is connected to the cooling circuit, and the bypass passage is closed.
[0088]
As described above, when the hot water flowing out of the engine E is collected into the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the bypass passage. It will be performed efficiently.
[0089]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the throttle passage is closed together with the bypass passage.
As described above, when the hot water flowing out of the engine E is collected into the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the throttle passage. The efficiency will be further improved.
[0090]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “ON”, the heater passage is opened together with the heat storage passage.
[0091]
As described above, when there is a heater request when collecting hot water into the heat storage container 16, the heater passage is opened to supply hot water to the heater core 14, so that the heating performance of the heater 14H deteriorates. Is suppressed.
[0092]
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “OFF”, among the cooling passages that can be opened and closed through control of the control valve, the cooling passages other than the heat storage passage (bypass passage, throttle passage) Passage and the heater passage).
[0093]
As described above, when there is no request for a heater when hot water is collected into the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the cooling passages. Thus, the recovery efficiency of the hot water can be further improved.
[0094]
Next, with reference to FIG. 6, an example of the hot water recovery mode by the “hot water recovery process during engine operation” will be described.
At time t61, the heater request flag exHC is turned “ON” (FIG. 6: [b]).
[0095]
At this time, the heater passage is opened (FIG. 6: [d]).
At time t62, it is assumed that the engine water temperature THwe has become equal to or higher than the hot water recovery determination temperature THwX (FIG. 6: [a]).
[0096]
At this time,
[C] Open the heat storage passage (connect the heat storage passage to the cooling circuit).
[D] Maintain the connection between the heater passage and the cooling circuit.
[E] Keep the bypass passage closed.
[F] Keep the throttle passage closed.
The above operations are performed.
[0097]
Thereby, since the cooling water is circulated through the heat storage circuit and the heater circuit, the hot water is recovered into the heat storage container 16 and the deterioration of the heating performance of the heater 14H is suppressed.
[0098]
At time t63, it is assumed that the hot water recovery period Pww has become equal to or longer than a predetermined recovery period PwwX.
At this time,
[C] Close the heat storage passage (disconnect the heat storage passage from the cooling circuit).
The above operation is performed.
[0099]
Thereafter, the open / close state of each cooling passage is controlled according to the operating state of the engine E and the like.
As described above in detail, according to the engine cooling device of the first embodiment, the following excellent effects can be obtained.
[0100]
(1) In the present embodiment, when the engine coolant temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is connected to the cooling circuit and the bypass passage is closed. As described above, when the hot water flowing out of the engine E is collected in the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the bypass passage. It can be collected.
[0101]
(2) In this embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the throttle passage and the bypass passage are closed. As described above, when the hot water flowing out of the engine E is collected into the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the throttle passage. The efficiency can be further improved.
[0102]
(3) In the present embodiment, when the engine coolant temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “on”, the heater passage is opened together with the heat storage passage. As described above, when there is a heater request when collecting hot water into the heat storage container 16, the heater passage is opened to supply hot water to the heater core 14, so that the heating performance of the heater 14H deteriorates. Can be suitably suppressed.
[0103]
(4) In the present embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request is “off”, each of the cooling passages other than the heat storage passage among the cooling passages that can be opened and closed through control of the control valve (A bypass passage, a throttle passage, and a heater passage). As described above, when there is no request for a heater when hot water is collected into the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the cooling passages. Further, it is possible to further improve the recovery efficiency of the hot water.
[0104]
In addition, the first embodiment can be embodied as follows, for example, in which this is appropriately changed.
In the first embodiment, in step S102 of the “hot water recovery process during engine operation”, the presence or absence of a heater request is determined, and the open / close state of the heater passage is switched according to the determination result. For example, it can be changed as follows. That is, the processing in steps S102 and S104 is omitted, and when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the recovery of the hot water can be performed through the processing from step S103.
[0105]
In the first embodiment, when the hot water recovery period Pww is shorter than the predetermined recovery period PwwX in step S105 of the “hot water recovery process during engine operation” (FIG. 2), the determination process of step S105 is performed by a predetermined process. Although the configuration is repeatedly executed in each cycle, for example, it can be changed as follows. That is, when the hot water recovery period Pww is shorter than the predetermined recovery period PwwX, the "hot water recovery process during engine operation" can be restarted from step S101 or step S102.
[0106]
In the first embodiment, the “hot water recovery process during engine operation” is started after the engine E is completely warmed up. The start timing of the process is exemplified in the first embodiment. The start time is not limited to the above and can be changed as appropriate.
[0107]
In the first embodiment, after performing the processing of steps S101 to S106, the “hot water recovery processing during engine operation” is ended, but the following modifications may be made, for example. . That is, the process can be restarted after the “hot water recovery process during engine operation” ends. In addition, when the elapsed time from the end of the “hot water recovery process during engine operation” is equal to or longer than a predetermined period, the process can be restarted.
[0108]
In the first embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is opened to recover the hot water, but the electric water pump 15 is driven when the hot water is recovered. Thereby, the recovery efficiency of hot water can be further improved.
[0109]
(Second embodiment)
A second embodiment of the present invention will be described with reference to FIGS. Note that the overall configuration of the apparatus according to the present embodiment is the same as that of the apparatus according to the first embodiment, and a duplicate description will be omitted.
[0110]
By the way, if the hot water is not collected into the heat storage container 16 during the operation of the engine E, the warm-up of the engine E cannot be promoted through the hot water at the next start of the engine. It is desirable that the state in which hot water is not stored in 16 be avoided as much as possible.
[0111]
Therefore, in the present embodiment, in consideration of such a situation, the “hot water recovery process during engine stop” (FIG. 7) described below is performed. In the present embodiment, the “hot water recovery process during engine operation” (FIG. 2) is performed while the engine E is operating, and the “hot water recovery process during engine stop” is performed while the engine E is stopped.
[0112]
[Hot water recovery processing while the engine is stopped]
With reference to FIG. 7, the “hot water recovery process during engine stop” will be described.
This processing is started when the engine E is stopped, and is ended after the processing of steps S201 to S205 described below is performed.
[0113]
[Step S201] It is determined whether or not the hot water has been recovered during the operation of the engine E (whether or not the hot water recovery flag exCW is "ON"). That is, the following conditions
exCW = ON
It is determined whether or not is satisfied.
[0114]
When the hot water recovery has already been performed (when the hot water recovery flag exCW is “ON”), the present process ends.
The hot water recovery flag exCW is set after the recovery of the hot water into the heat storage container 16 is completed.
[0115]
[Step S202] When hot water recovery is not being performed (when the hot water recovery flag exCW is “OFF”), the following operations [a] to [d] are performed.
[A] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B] The second port P2 of the three-way valve 24 is closed.
[C] The flow control valve 22 is fully closed.
[D] The on-off valve 23 is closed.
[0116]
Through each of these operations, the heat storage passage is connected to the cooling circuit, while the bypass passage, the throttle passage, and the heater passage are closed.
[Step S203] The electric water pump 15 is driven.
[0117]
Through this operation, the cooling water circulates through the heat storage circuit.
Thereby, the warm water flowing out of the engine E is collected into the heat storage container 16.
[0118]
[Step S204] It is determined whether the period during which the hot water is collected in the heat storage container 16 (the hot water recovery period Pww) is equal to or longer than a predetermined recovery period PwwX. That is, the following conditions
Pww ≧ PwwX
It is determined whether or not is satisfied.
[0119]
When the hot water recovery period Pww is shorter than the predetermined recovery period PwwX, the above-described determination process is repeatedly executed at predetermined intervals.
Note that the predetermined recovery period PwwX is used as a threshold value of the hot water recovery period indicating whether the hot water flowing out of the engine E has been sufficiently recovered into the heat storage container 16. That is, when the hot water recovery period Pww is equal to or longer than the predetermined recovery period PwwX, a sufficient amount of hot water is stored in the heat storage container 16.
[0120]
Incidentally, the predetermined recovery period PwwX can be set according to the capacity of the heat storage container 16, the pump performance, and the like.
[Step S205] When the hot water recovery period Pww is equal to or longer than the predetermined recovery period PwwX, the electric water pump 15 is stopped.
[0121]
[Step S206] The first port P1 and the third port P3 of the three-way valve 24 are closed.
Through this operation, the heat storage passage is disconnected from the cooling circuit.
[0122]
As described above, according to the hot water recovery process while the engine is stopped, the hot water is recovered in the following mode [C].
[C] When the hot water is not collected into the heat storage container 16 during the operation of the engine E, after the engine E is stopped, the heat storage passage is connected to the cooling circuit, and the electric water pump 15 is driven for a predetermined period. I do.
[0123]
Here, with reference to FIG. 8, the control mode of the engine cooling device 1 by the hot water recovery process (FIG. 7) while the engine is stopped will be summarized.
When the hot water recovery flag exCW is “OFF” while the engine E is stopped, the engine cooling device 1 is controlled in the following modes [C1] to [C5].
[C1] The flow control valve 22 is fully closed.
[C2] The on-off valve 23 is closed.
[C3] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[C4] The second port P2 of the three-way valve 24 is closed.
[C5] The electric water pump 15 is driven.
[0124]
Incidentally, the thermostat 21 is maintained at an opening corresponding to the temperature of the cooling water.
When the hot water recovery flag exCW is “ON” while the engine E is stopped, no special control for the engine cooling device 1 is performed.
[0125]
Next, with reference to FIG. 9, a circulation mode of the cooling water at the time of collecting the hot water while the engine is stopped will be described. In FIG. 9, a cooling passage indicated by a solid line indicates a passage through which the cooling water flows, an arrow indicates a flow direction of the cooling water, and a cooling passage indicated by a broken line indicates a passage through which the cooling water does not flow.
[0126]
[Cooling water circulation mode [3]]
When the hot water recovery flag exCW is “OFF” while the engine E is stopped, the cooling water is connected to the cooling circuit and the electric water pump 15 is driven. It will circulate through the passage.
[0127]
Next, the function and effect achieved by the hot water recovery process (FIG. 7) while the engine is stopped will be described.
In this process, when the hot water is not collected into the heat storage container 16 during the operation of the engine E, after the engine E is stopped, the heat storage passage is connected to the cooling circuit, and the cooling water is circulated through the electric water pump 15. I try to make it.
[0128]
As described above, when the hot water is not collected in the heat storage container 16 during the operation of the engine E, the hot water is collected while the engine E is stopped. Will be collected.
[0129]
In this process, when hot water is collected into the heat storage container 16 while the engine E is stopped, only the heat storage passages among the cooling passages that can be opened and closed through the control of the control valve are opened, and the cooling passages other than the heat storage passages (bypasses) are opened. Passage, throttle passage, and heater passage).
[0130]
In this way, by closing each cooling passage other than the heat storage passage at the time of collecting the hot water, the flow rate of the hot water flowing into the heat storage container 16 is increased, so that the hot water can be efficiently collected. become.
[0131]
Next, with reference to FIG. 10, an example of the hot water recovery mode by the “hot water recovery process while the engine is stopped” will be described.
At time t101, the engine E is assumed to be stopped (FIG. 10: [a]).
[0132]
At this time, if the hot water recovery flag exCW is “off”,
[C] Open the heat storage passage.
[D] Close the heater passage.
[E] Close the bypass passage.
[F] Close the throttle passage.
[G] The driving of the electric water pump 15 is started.
These operations are performed.
[0133]
Thereby, the cooling water circulates through the heat storage circuit, so that the warm water flowing out of the engine E is stored in the heat storage container 16.
At time t102, it is assumed that the hot water recovery period Pww has exceeded a predetermined recovery period PwwX.
[0134]
At this time,
[C] Close the heat storage passage.
[G] The electric water pump 15 is stopped.
These operations are performed, and the hot water recovery is completed.
[0135]
As described above in detail, according to the cooling device for an engine according to the second embodiment, in addition to the effects (1) to (4) according to the first embodiment, the following will be further described. The following effects can be obtained.
[0136]
(5) In this embodiment, when the hot water is not collected into the heat storage container 16 during the operation of the engine E, the heat storage passage is connected to the cooling circuit after the engine E is stopped, and the electric water pump 15 is connected. Cooling water is circulated through. Thus, when the hot water is not collected into the heat storage container 16 during the operation of the engine E, the hot water is collected while the engine E is stopped. To be collected.
[0137]
(6) In the present embodiment, when hot water is collected into the heat storage container 16 while the engine E is stopped, the bypass passage is closed. In this way, by closing the bypass passage when recovering the hot water, the flow rate of the hot water flowing into the heat storage container 16 is increased, so that the hot water can be recovered efficiently.
[0138]
(7) In the present embodiment, the throttle passage and the heater passage are closed when hot water is collected into the heat storage container 16 while the engine E is stopped. As described above, by closing each of the cooling passages, the flow rate of the hot water flowing into the heat storage container 16 at the time of collecting the hot water is increased, so that the recovery efficiency of the hot water can be further improved. Become like
[0139]
Note that the second embodiment can be embodied as a modified form, for example, as follows.
In the above-described second embodiment, the “hot water recovery process while the engine is stopped” (FIG. 7) is started when the engine E is stopped. However, for example, the following change may be made. . That is, the “hot water recovery process while the engine is stopped” can be started after a predetermined period has elapsed from the stop of the engine E.
[0140]
In the second embodiment, the configuration is such that the hot water is recovered in the heat storage container 16 through the “hot water recovery process while the engine is stopped”. However, the configuration of the “hot water recovery process while the engine is stopped” is as described above. The configuration is not limited to the configuration exemplified in the second embodiment. In short, on the condition that hot water is not collected during operation of the engine E, if the control mode is such that hot water is collected with the bypass passage closed while the engine E is stopped, “the engine is stopped. The control mode of the "hot water recovery process" can be changed as appropriate.
[0141]
(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS.
[0142]
The configuration of the present embodiment is basically the same as the configuration of the first embodiment, but it is possible to further improve the collection efficiency of hot water by controlling the open / close state of the radiator passage. ing.
[0143]
First, the configuration of the entire apparatus will be described with reference to FIG.
The configuration of the engine cooling device 1 according to the present embodiment has the following changes over the device according to the first embodiment.
[0144]
That is, as shown in the broken line, the second flow control valve 25 is provided in the radiator passage.
The second flow control valve 25 is capable of continuously changing the opening degree of the valve between a minimum opening degree (fully closed) and a maximum opening degree (fully opened).
[0145]
By performing the valve closing control of the second flow control valve 25, the radiator passage can be closed regardless of the operation state of the thermostat 21. The second flow control valve 25 is also controlled through the ECU 3.
[0146]
In this embodiment, in response to the above change, during the operation of the engine E, the “engine operation” described below is replaced with the “hot water recovery process during engine operation” (FIG. 2) of the first embodiment. Medium hot water recovery process ”(FIG. 12).
[0147]
[Hot water recovery processing during engine operation]
With reference to FIG. 12, the “hot water recovery processing during engine operation” will be described.
This processing is started after the warm-up of the engine E is completed, and is ended after the processing of steps S301 to S306 described below is performed.
[0148]
[Step S301] The same processing as in step S101 (FIG. 2) is performed.
[Step S302] The same processing as in step S102 (FIG. 2) is performed.
[Step S303] When there is a heater request (when the heater request flag exHC is “ON”), the following operations [a] to [d] are performed.
[A] Open all ports of the three-way valve 24.
[B] The flow control valve 22 is fully closed.
[C] The on-off valve 23 is closed.
[D] The second flow control valve 25 is fully closed.
[0149]
Through these operations, the heat storage passage and the heater passage are connected to the cooling circuit (the heat storage passage and the heater passage are opened), while the radiator passage, the bypass passage, and the throttle passage are closed.
[0150]
Thereby, the cooling water circulates through the heat storage circuit, so that the warm water flowing out of the engine E flows into the heat storage container 16. That is, the hot water is collected into the heat storage container 16.
[0151]
Further, since the cooling water is circulated through the heater circuit, the warm water flowing out of the engine E flows into the heater core 14.
[Step S304] When the heater request flag exHC is “OFF”, the following operations [a] to [e] are performed.
[A] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[B] The second port P2 of the three-way valve 24 is closed.
[C] The flow control valve 22 is fully closed.
[D] The on-off valve 23 is closed.
[E] The second flow control valve 25 is fully closed.
[0152]
Through these operations, the heat storage passage is connected to the cooling circuit (the heat storage passage is opened), while the radiator passage, the bypass passage, the throttle passage, and the heater passage are closed.
[0153]
Thereby, the cooling water circulates through the heat storage circuit, so that the warm water flowing out of the engine E is collected into the heat storage container 16.
[Step S305] The same processing as in step S105 (FIG. 2) is performed.
[0154]
[Step S306] When the hot water recovery period Pww becomes equal to or longer than the predetermined recovery period PwwX, the third port P3 of the three-way valve 24 is closed and the second flow control valve 25 is opened.
[0155]
Through this operation, the heat storage passage is disconnected from the cooling circuit, while the radiator passage is opened.
As described above, according to the hot water recovery process during the operation of the engine, the hot water is recovered in the following modes [D] and [E].
[D] When the engine coolant temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “ON”, the heat storage passage and the heater passage are maintained connected to the cooling circuit, while the radiator passage, the bypass passage, Then, while keeping the throttle passage closed, hot water is collected.
[E] When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “OFF”, the radiator passage, the bypass passage, the throttle passage, Then, the hot water is recovered while keeping the heater passage closed.
[0156]
Here, with reference to FIG. 13, the control mode of the engine cooling device 1 by the hot water recovery process (FIG. 12) during the operation of the engine will be summarized.
When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “ON”, the engine cooling device 1 is controlled in the following modes [D1] to [D5].
[D1] The flow control valve 22 is fully closed.
[D2] The on-off valve 23 is closed.
[D3] Open all ports of the three-way valve 24.
[D4] The second flow control valve 25 is fully closed.
[D5] The electric water pump 15 is stopped.
[0157]
When the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is “OFF”, the engine cooling device 1 is controlled in the following modes [E1] to [E6].
[E1] The flow control valve 22 is fully closed.
[E2] The on-off valve 23 is opened.
[E3] The first port P1 and the third port P3 of the three-way valve 24 are opened.
[E4] The second port P2 of the three-way valve 24 is closed.
[E5] The second flow control valve 25 is fully closed.
[E6] The electric water pump 15 is stopped.
[0158]
Incidentally, the thermostat 21 is maintained at an opening corresponding to the temperature of the cooling water.
In operation states other than the above, the flow control valve 22, the on-off valve 23, the three-way valve 24, the second flow control valve 25, and the electric water pump 15 are separately processed according to the operation state of the engine E and the like. Is controlled.
[0159]
Next, with reference to FIG. 14 and FIG. 15, a circulation mode of the cooling water at the time of collecting the hot water will be described. In FIGS. 14 and 15, the cooling passages indicated by solid lines indicate passages through which the cooling water flows, the arrows indicate the flow direction of the cooling water, and the cooling passages indicated by broken lines indicate passages through which the cooling water does not flow. .
[0160]
[Cooling water circulation mode [4]]
With reference to FIG. 14, a description will be given of the cooling water circulation mode when "the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is" ON "".
[0161]
At this time, since the heat storage passage and the heater passage are connected to the cooling circuit, the cooling water circulates through the first cooling passage R1, the heat storage passage, the heater passage, and the second cooling passage R2.
[0162]
On the other hand, since the radiator passage, the bypass passage, and the throttle passage are closed, the cooling water does not flow through each of the cooling passages.
[Cooling water circulation mode [5]]
Referring to FIG. 15, a description will be given of the cooling water circulation mode when "the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX and the heater request flag exHC is" OFF "".
[0163]
At this time, since the heat storage passage is connected to the cooling circuit, the cooling water circulates through the first cooling passage R1 and the heat storage passage.
On the other hand, since the radiator passage, the bypass passage, the throttle passage, and the heater passage are closed, the cooling water does not flow through these cooling passages.
[0164]
Next, the operation and effect achieved by the hot water recovery process (FIG. 12) during operation of the engine will be described.
In this process, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the hot water is recovered with the radiator passage, the bypass passage, and the throttle passage closed.
[0165]
As described above, when the hot water flowing out of the engine E is collected into the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the radiator passage. The efficiency can be further improved.
[0166]
Next, with reference to FIG. 16, an example of the hot water recovery mode by the “hot water recovery process during engine operation” will be described.
At time t161, the heater request flag exHC is turned on (FIG. 16: [b]).
[0167]
At this time, the heater passage is opened (FIG. 16: [d]).
At time t162, it is assumed that the engine water temperature THwe has become equal to or higher than the hot water recovery determination temperature THwX (FIG. 16: [a]).
[0168]
At this time,
[C] Open the heat storage passage (connect the heat storage passage to the cooling circuit).
[D] Maintain the connection between the heater passage and the cooling circuit.
[E] Close the radiator passage.
[F] Keep the bypass passage closed.
[G] Keep the throttle passage closed.
The above operations are performed.
[0169]
Thereby, since the cooling water is circulated through the heat storage circuit and the heater circuit, the hot water is recovered into the heat storage container 16 and the deterioration of the heating performance of the heater 14H is suppressed.
[0170]
At time t163, it is assumed that the hot water recovery period Pww is equal to or longer than a predetermined recovery period PwwX.
At this time,
[C] Close the heat storage passage (disconnect the heat storage passage from the cooling circuit).
[E] Open the radiator passage (open the second flow control valve 25).
The above operations are performed.
[0171]
Thereafter, the open / close state of each cooling passage is controlled according to the operating state of the engine E and the like.
As described in detail above, according to the engine cooling device according to the third embodiment, in addition to the effects (1) to (4) according to the first embodiment, furthermore, The following effects can be obtained.
[0172]
(8) In the present embodiment, the radiator passage, the bypass passage, and the throttle passage are closed when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX.
[0173]
As described above, when the hot water flowing out of the engine E is collected in the heat storage container 16, the flow rate of the hot water flowing into the heat storage container 16 is increased by closing the radiator passage. The efficiency can be further improved.
[0174]
Note that the third embodiment can be embodied as the following, for example, in which this is appropriately changed.
The second embodiment can be applied to the third embodiment. That is, in the third embodiment, the “hot water recovery process while the engine is stopped” (FIG. 7) can be performed while the engine E is stopped.
[0175]
In the above modification, when collecting the hot water while the engine E is stopped, the radiator passage may be closed through closing the second flow control valve 25. When such a configuration is adopted, the radiator passage can be properly closed when the hot water is collected while the engine E is stopped, so that the hot water can be collected more appropriately.
[0176]
In the third embodiment, in step S302 of the “hot water recovery process during engine operation” (FIG. 12), the presence or absence of a heater request is determined, and the open / close state of the heater passage is switched according to the determination result. However, for example, it is possible to change as follows. That is, the processing of steps S302 and S304 is omitted, and when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the recovery of the hot water can be performed through the processing of step S303 and thereafter.
[0177]
In the third embodiment, when the hot water recovery period Pww is shorter than the predetermined recovery period PwwX in step S305 of the “hot water recovery process during engine operation” (FIG. 12), the determination process of step S305 is performed by the predetermined process. Although the configuration is repeatedly executed in each cycle, for example, it can be changed as follows. That is, when the hot water recovery period Pww is shorter than the predetermined recovery period PwwX, the "hot water recovery process during engine operation" can be restarted from step S301 or step S302.
[0178]
In the third embodiment, the “hot water recovery process during engine operation” is started after the warm-up of the engine E is completed. However, the start timing of the process is exemplified in the third embodiment. The start time is not limited to the above and can be changed as appropriate.
[0179]
In the third embodiment, the processing of steps S301 to S306 is performed, and then the “hot water recovery processing during engine operation” is ended. However, for example, the processing may be changed as follows. . That is, the process can be restarted after the “hot water recovery process during engine operation” ends. In addition, when the elapsed time from the end of the “hot water recovery process during engine operation” is equal to or longer than a predetermined period, the process can be restarted.
[0180]
In the third embodiment, when the engine water temperature THwe is equal to or higher than the hot water recovery determination temperature THwX, the heat storage passage is opened to recover the hot water. However, the electric water pump 15 is driven when the hot water is recovered. Thereby, the recovery efficiency of hot water can be further improved.
[0181]
In the third embodiment, the second flow control valve 25 is provided in the radiator passage. However, in place of the second flow control valve 25, an on-off valve that can be switched to either open or closed. May be provided in the radiator passage.
[0182]
(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. Note that the configuration of the entire apparatus according to the present embodiment is the same as that of the first embodiment, and a duplicate description will be omitted.
[0183]
By the way, at the time of high load operation of the engine E, the cooling water for cooling the engine E becomes extremely high temperature, and the cooling performance of the engine E deteriorates.
For this reason, during the high load operation of the engine E, it is conceivable to retard the ignition timing in order to avoid an overheated state of the engine E. It will be mimicking.
[0184]
Thus, in the present embodiment, by performing “engine cooling processing” described below, it is possible to avoid overheating of the engine while maintaining engine performance during high-load operation of the engine.
[0185]
In the present embodiment, the “engine cooling process” (FIG. 17) is performed in parallel with the “hot water recovery process during engine operation” (FIG. 2).
[Engine cooling process]
The “engine cooling process” will be described with reference to FIG. This process is repeatedly executed at predetermined intervals during the operation of the engine E.
[0186]
[Step S401] It is determined whether or not the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH. That is, the following conditions
THwe ≧ THwH
It is determined whether or not is satisfied.
[0187]
The overheat determination temperature THwH is used as a threshold value of the engine water temperature indicating whether or not the engine E may be overheated. That is, when the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwX, the engine E may be overheated.
[0188]
Incidentally, the overheat determination temperature THwH can be set, for example, as a temperature obtained by adding a predetermined value to the temperature at which the thermostat 21 opens (thermostat opening temperature THts). That is, the following formula
THwH = THts + α
It is possible to set through.
[0189]
[Step S402] When the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, the following operations [a] to [c] are performed.
[A] The flow control valve 22 is fully opened.
[B] The on-off valve 23 is opened.
[C] Open all ports of the three-way valve 24.
[0190]
Through these operations, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened.
Thereby, the cooling water circulates through all the cooling passages of the engine cooling device 1.
[0191]
The process of step S402 is performed with higher priority than the control of each control valve by the "hot water recovery process during engine operation" (FIG. 2). That is, even if the flow control valve 22, the on-off valve 23, and the three-way valve 24 (the second port P2) are closed through the "hot water recovery processing during engine operation", the processing in step S402 is performed. These control valves are forcibly opened.
[0192]
[Step S403] When the engine water temperature THwe is lower than the overheat determination temperature THwH (or when the engine water temperature THwe is lower than the overheat determination temperature THwH), the open / close state of each control valve is controlled according to the operating state of the engine E, This process ends once.
[0193]
As described above, according to the engine cooling process, the engine E is cooled in the following mode [F].
[F] When the engine water temperature THwe is equal to or higher than the overheat determination temperature THwH, the cooling water is circulated with the bypass passage, the throttle passage, the heater passage, and the heat storage passage open.
[0194]
Here, a control mode of the engine cooling device 1 by the engine cooling process (FIG. 17) will be summarized with reference to FIG.
When the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, the engine cooling device 1 is controlled in the following modes [F1] to [F4].
[F1] The flow control valve 22 is fully opened.
[F2] The on-off valve 23 is opened.
[F3] Open all ports of the three-way valve 24.
[F4] The electric water pump 15 is stopped.
[0195]
Incidentally, the thermostat 21 is maintained at an opening corresponding to the temperature of the cooling water. In the operation state other than the above, the flow control valve 22, the on-off valve 23, the three-way valve 24, and the electric water pump 15 are controlled according to the operation state of the engine E by a separate process.
[0196]
Next, a cooling mode of the engine E will be described with reference to FIG. In FIG. 19, the cooling passages indicated by solid lines indicate the passages through which the cooling water flows, and the arrows indicate the flow directions of the cooling water.
[0197]
[Cooling water circulation mode [6]]
When the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, the radiator passage, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are open.
[0198]
Therefore, the cooling water circulates through the first cooling passage R1, the radiator passage, the bypass passage, the throttle passage, the heater passage, the heat storage passage, and the second cooling passage R2.
[0199]
Next, the function and effect achieved by the engine cooling process (FIG. 17) will be described.
In the present process, when the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, all the openable and closable cooling passages are opened through the control of the control valve.
[0200]
As described above, when the engine E may fall into an overheated state, the flow rate of the cooling water circulating through the engine E is increased by opening the cooling passages. An overheating condition is preferably avoided.
[0201]
Further, since the cooling water is circulated through the heater passage, heat exchange is performed between the cooling water and the vehicle interior heating air in the heater core 14, so that the cooling performance of the engine E is further improved. Become.
[0202]
Further, the improvement of the cooling performance is realized by controlling the opening and closing of the cooling passage, so that the engine performance is suitably maintained.
Next, an example of a mode of cooling the engine by the “engine cooling process” will be described with reference to FIG.
[0203]
At time t201, it is assumed that the engine coolant temperature THwe has become equal to or higher than the overheat determination temperature THwH (FIG. 20: [a]).
At this time,
[B] Open the bypass passage.
[C] Open the throttle passage.
[D] Open the heater passage.
[E] Open the heat storage passage.
The above operations are performed.
[0204]
Thus, the cooling water is circulated through the bypass passage, the throttle passage, the heater passage, and the heat storage passage in accordance with the radiator passage, so that the cooling performance of the engine E is improved.
[0205]
At time t202, it is assumed that the engine coolant temperature THwe becomes lower than the overheat determination temperature THwH (FIG. 20: [a]).
At this time, each cooling passage is opened and closed according to the operating state of the engine E (FIG. 20: [b] to [e]).
[0206]
As described in detail above, according to the cooling device for an engine according to the fourth embodiment, in addition to the effects (1) to (4) according to the first embodiment, the following will be further described. The following effects can be obtained.
[0207]
(9) In this embodiment, when the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened. As described above, when the engine E is likely to be overheated, the flow rate of the cooling water circulating through the engine E is increased by opening these cooling passages. The overheating state can be avoided appropriately.
[0208]
(10) Further, since the cooling water is circulated through the heater passage, heat exchange is further performed between the cooling water and the vehicle interior heating air in the heater core 14, so that the cooling performance of the engine E is improved. Can be improved.
[0209]
(11) Further, since the improvement of the cooling performance is realized by controlling the opening and closing of the cooling passage, the engine performance can be suitably maintained.
The fourth embodiment can be embodied as follows, for example, in which the above-described fourth embodiment is modified as appropriate.
[0210]
-The fourth embodiment can be applied to the second embodiment. That is,
[B] "Hot water recovery processing during engine operation (Fig. 2)"
[B] "Hot water recovery processing while the engine is stopped (Fig. 7)"
[C] "Engine cooling process (Fig. 17)"
These processes can be performed together.
[0211]
-The fourth embodiment can be applied to the third embodiment. That is,
[B] "Hot water recovery processing during engine operation (Fig. 12)"
[B] "Engine cooling process (Fig. 17)"
These processes can be performed together. In addition, it is also possible to perform “hot water recovery processing while the engine is stopped (FIG. 7)”.
[0212]
In the fourth embodiment, when the engine coolant temperature THwe is equal to or higher than the overheat determination temperature THwH, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened to cool the engine E. By driving the electric water pump 15 when cooling the engine E, the cooling performance of the engine E can be further improved.
[0213]
In the fourth embodiment, the engine E is cooled through the “engine cooling process”. However, the configuration of the “engine cooling process” is limited to the configuration exemplified in the fourth embodiment. It is not something that can be done. In short, if there is a risk that the engine E may be overheated during the operation of the engine E, if the control mode is such that the cooling performance of the engine E can be improved by switching the open / close state of the cooling passage, the "engine cooling process" Can be changed as appropriate.
[0214]
(Other embodiments)
In addition, the following elements can be commonly changed in the above embodiments.
[0215]
In the above embodiments, the thermostat 21 that operates according to the temperature of the cooling water is used. However, for example, the thermostat 21 can be modified as follows. That is, an electronic thermostat that can electrically control the open / closed state of the valve can also be used.
[0216]
In each of the above embodiments, the opening and closing valve 23 is provided in the throttle passage. However, for example, the following changes may be made. That is, a flow control valve capable of continuously changing the opening degree of the valve may be provided instead of the on-off valve 23.
[0219]
In each of the above embodiments, the flow control valve 22 is provided in the bypass passage. However, for example, the following change may be made. That is, in place of the flow control valve 22, an on-off valve that can be switched between open and closed can be provided.
[0218]
In the above embodiments, the open / close state of the heater passage and the heat storage passage is switched through the control of the three-way valve 24, but may be changed as follows, for example. That is, an on-off valve or a flow control valve can be provided in each of the heater passage and the heat storage passage, and the open / close state of the heater passage and the heat storage passage can be switched by controlling the provided control valve.
[0219]
In each of the above embodiments, the engine cooling device 1 in which the cooling circuit includes the first cooling passage R1, the radiator passage, the bypass passage, the throttle passage, and the second cooling passage R2 is assumed. The configuration is not limited to the configuration illustrated in each of the above embodiments, and can be appropriately changed.
[0220]
In the above embodiments, the present invention is embodied assuming the engine cooling device 1 illustrated in FIG. 1 (FIG. 11). However, the configuration of the engine cooling device is the same as the configuration illustrated in each of the above embodiments. The present invention is not limited to this, and an appropriate configuration can be adopted. In short, a cooling device having an arbitrary configuration is used as long as the engine cooling device includes a cooling circuit including the radiator passage, the bypass passage, and the flow control valve 22, and a heat storage circuit including the heat storage container 16. can do.
[0221]
In the above-described embodiments, the configuration is such that the hot water is collected in the heat storage container 16 through the “hot water recovery process during engine operation”. However, the present invention is not limited to the configuration exemplified in the embodiment. In short, in a control mode in which the bypass passage is closed and the hot water is recovered when the temperature of the cooling water flowing out of the engine E is equal to or higher than a predetermined temperature, the configuration of the “hot water recovery process during engine operation” is appropriately changed. It is possible.
[Brief description of the drawings]
FIG. 1 is a schematic view schematically showing a configuration of an entire apparatus in a first embodiment embodying an engine cooling apparatus according to the present invention.
FIG. 2 is a flowchart showing “hot water recovery processing during engine operation” performed in the embodiment.
FIG. 3 is a diagram showing a control mode of the engine cooling device by “hot water recovery processing during engine operation” performed in the embodiment.
FIG. 4 is a diagram showing a cooling water circulation mode (cooling water circulation mode [1]) at the time of collecting hot water during operation of the engine in the engine cooling device of the embodiment.
FIG. 5 is a diagram showing a cooling water circulation mode (cooling water circulation mode [2]) at the time of collecting hot water during operation of the engine in the engine cooling device of the embodiment.
FIG. 6 is a timing chart showing a hot water recovery mode (hot water recovery mode [1]) by the “hot water recovery process during engine operation” for the engine cooling device of the embodiment.
FIG. 7 is a flowchart showing “hot water recovery processing during engine stop” performed in the second embodiment that embodies the engine cooling device according to the present invention.
FIG. 8 is a diagram showing a control mode of the engine cooling device by a “hot water recovery process while the engine is stopped” performed in the embodiment.
FIG. 9 is a diagram showing a cooling water circulation mode (cooling water circulation mode [3]) during recovery of hot water while the engine is stopped, in the engine cooling device of the embodiment.
FIG. 10 is a timing chart showing a hot water recovery mode (hot water recovery mode [2]) by the “hot water recovery process while the engine is stopped” in the engine cooling device of the embodiment.
FIG. 11 is a schematic view schematically showing a configuration of an entire apparatus according to a third embodiment that embodies an engine cooling apparatus according to the present invention.
FIG. 12 is a flowchart showing “hot water recovery processing during engine operation” performed in the embodiment.
FIG. 13 is a diagram showing a control mode of the engine cooling device by “hot water recovery processing during engine operation” performed in the embodiment.
FIG. 14 is a diagram showing a cooling water circulation mode (cooling water circulation mode [4]) at the time of collecting hot water during engine operation in the engine cooling device of the embodiment.
FIG. 15 is a diagram showing a cooling water circulation mode (cooling water circulation mode [5]) at the time of collecting hot water during operation of the engine in the engine cooling device of the embodiment.
FIG. 16 is a timing chart showing a hot water recovery mode (hot water recovery mode [3]) by the “hot water recovery process during engine operation” for the engine cooling device of the embodiment.
FIG. 17 is a flowchart showing an “engine cooling process” performed in the fourth embodiment that embodies the engine cooling device according to the present invention;
FIG. 18 is a diagram showing a control mode of the engine cooling device by an “engine cooling process” performed in the embodiment.
FIG. 19 is a diagram showing a cooling water circulation mode (cooling water circulation mode [6]) during engine cooling in the engine cooling device of the embodiment.
FIG. 20 is a timing chart showing a manner of cooling the engine by “engine cooling processing” in the engine cooling device according to the embodiment;
[Explanation of symbols]
E: engine, 1: engine cooling device, 11: water pump, 12: radiator, 13: throttle body, 14: heater core, 14H: heater, 15: electric water pump, 16: heat storage container, 17: delivery pipe for cooling water , 21 thermostat, 22 flow control valve, 23 on-off valve, 24 three-way valve, P1 first port, P2 second port, P3 third port, 25 second flow control valve, 3 ECU, S1: engine water temperature sensor, S2: heat storage container water temperature sensor, R1: first cooling passage, R2: second cooling passage, R3: third cooling passage, R4: fourth cooling passage, R5: fifth cooling passage, R6: sixth cooling passage, R7: seventh cooling passage, R8: eighth cooling passage, R9: ninth cooling passage, R10: tenth cooling passage, R11: eleventh cooling passage, R12: twelfth cooling passage , R13 ... 13 cooling passage, R14 ... 14 cooling passage.

Claims (6)

A radiator passage for allowing the refrigerant flowing out of the engine body to flow into the engine body via a radiator, and a bypass for allowing the refrigerant flowing out of the engine body to flow into the engine body without passing through the radiator A cooling circuit configured to include a passage, a first control valve that controls a flow rate of the refrigerant flowing through the bypass passage, and a heat storage container that retains and stores the refrigerant flowing out of the main body of the engine while maintaining the temperature. A heat storage passage which is selectively connected to a cooling circuit to circulate the refrigerant through the main body of the engine and the heat storage container, and which constitutes a heat storage circuit. An engine cooling device that allows a refrigerant flowing from the engine body to flow through the bypass passage by opening a control valve. In,
When the temperature of the refrigerant flowing out of the engine body is equal to or higher than a predetermined temperature, the engine is provided with control means for closing the first control valve to flow the refrigerant into the heat storage container. Cooling system. The engine cooling device according to claim 1,
The cooling circuit is configured to further include a second control valve that controls a flow rate of the refrigerant flowing through the radiator passage,
The cooling of the engine, wherein the control means closes the second control valve when the first control valve is closed to allow the refrigerant flowing out of the main body of the engine to flow into the heat storage container. apparatus. The engine cooling device according to claim 1 or 2,
The controller may be configured to, when the refrigerant flowing out of the main body of the engine cannot be recovered into the heat storage container during the operation of the engine, while the first control valve is closed while the engine is stopped. A cooling device for an engine, wherein a refrigerant flowing out of a main body of the engine is caused to flow into the heat storage container. The engine cooling device according to claim 3,
The cooling device for the engine is provided with a heater core for performing heat exchange between the refrigerant flowing out of the main body of the engine and the air for heating the vehicle interior, and selectively connects the refrigerant to the cooling circuit to reduce the refrigerant. Further comprising a heater passage forming a heater circuit for circulating through the main body of the engine and the heater core,
The control means controls a connection mode of the heater passage to the cooling circuit, and when the refrigerant flowing out of the main body of the engine flows into the heat storage container during operation of the engine, the heater passage is connected to the cooling circuit. An engine cooling device for disconnecting the heater passage from the cooling circuit when the refrigerant flowing out of the main body of the engine is allowed to flow into the heat storage container while the engine is stopped while maintaining the connected state. . The engine cooling device according to claim 4,
The controller controls the cooling of the heater passage under a condition that there is a request to flow the refrigerant into the heater core when the refrigerant flowing out of the main body of the engine flows into the heat storage container during operation of the engine. An engine cooling device, characterized in that the heater passage is disconnected from the cooling circuit when the condition is not satisfied while maintaining the state connected to the circuit. The engine cooling device according to any one of claims 1 to 5,
The cooling circuit is configured to include a throttle passage for allowing refrigerant flowing out of the engine main body to flow into the engine main body through a throttle body, and an on-off valve for opening and closing the throttle passage.
The cooling device for an engine, wherein the control means closes the on-off valve when the first control valve is closed to allow the refrigerant flowing out of the main body of the engine to flow into the heat storage container.

Images