JP4100220B2 - Engine cooling system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine cooling device for cooling an engine through circulation of a refrigerant.
[0002]
[Prior art]
2. Description of the Related Art A cooling device provided with a heat storage container is known as an engine cooling device that cools an engine through circulation of a refrigerant. In such a cooling device, it is possible to store the refrigerant while keeping the temperature of the refrigerant by flowing into the heat storage container the refrigerant that has become high temperature due to heat received from the engine.
[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 is used as a refrigerant passage for circulating the refrigerant.
[I] “Bypass passage for recirculating refrigerant flowing out of the engine body to the engine body bypassing the radiator”
[B] “Heat storage passage provided with a heat storage container and for allowing the refrigerant stored in the heat storage container to flow into the main body of the engine”
These [A] and [B] cooling passages are provided.
[0004]
The bypass passage is provided with a control valve, and the open / close state of the bypass passage can be switched through the control of the control valve.
In this engine cooling device, when the engine is started, the heat storage passage is connected to the cooling circuit to supply the warm refrigerant in the heat storage container to the main body of the engine, and the temperature of the refrigerant in the heat storage container becomes less than a predetermined temperature. Sometimes the heat storage passage is disconnected from the cooling circuit.
[0005]
In any of these cases, the low-temperature refrigerant is prevented from being returned to the engine body by closing the bypass passage, thereby promoting warm-up of the engine.
[0006]
Further, after the bypass passage is closed, the bypass passage is switched from the closed state to the open state based on the fact that the temperature of the refrigerant flowing out from the engine main body becomes equal to or higher than a predetermined temperature.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-77839
[0008]
[Problems to be solved by the invention]
By the way, in the engine cooling device, the engine is maintained by maintaining the cooling circuit in the closed state through the closing of the bypass passage in the early warm-up period after the engine is started, and retaining the refrigerant for cooling the engine body in the engine body. Although it is conceivable to further improve the warm-up performance, there are concerns about the following.
[0009]
That is, because the refrigerant stays in the main body of the engine, the output value of the temperature sensor that detects the temperature of the refrigerant flowing out of the main body of the engine no longer shows a value corresponding to the warm-up state of the main body of the engine. This leads to a problem that the cooling circuit cannot be properly opened according to the warm-up state of the engine.
[0010]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide an engine cooling apparatus that can appropriately open a cooling circuit according to a warm-up state of the engine.
[0013]
[Means for Solving the Problems]
In the following, means for achieving the above object and its effects are described.
(1) Claim 1The invention described includes a cooling circuit that circulates a refrigerant that cools the main body of the engine through the main body of the engine, a control valve that opens and closes the cooling circuit, and a refrigerant that flows out of the main body of the engine A temperature sensor that detects the temperature of the engine, and closes the cooling circuit by closing the control valve in the initial warm-up period after starting the engine. In an engine cooling device for retaining a refrigerant for cooling an engine body in the engine body, an integrated value of a fuel injection amount or an intake air amount from the start of the engine is calculated, and the calculated integrated value is a predetermined value. Control means for controlling the control valve to switch the cooling circuit from a closed state to an open state when a value is exceeded, the cooling circuit comprising the engine As a refrigerant passage for circulating a refrigerant for cooling the main body, a bypass passage for allowing the refrigerant flowing out from the engine main body to bypass the radiator and flowing into the engine main body, and a refrigerant flowing out from the engine main body A throttle passage for flowing into the engine body through the throttle body, and a first control valve for opening and closing the bypass passage as a control valve for opening and closing the cooling circuit and opening and closing the throttle passage. The second control valve has a second control valve, and the control means opens the second control valve when the integrated value exceeds the predetermined value.
[0014]
  According to the above configuration, the integrated value of the fuel injection amount from the start of the engine is calculated. When the integrated value exceeds a predetermined value, the cooling circuit is switched from the closed state to the open state through control of the control valve. As described above, when it is considered that the output value of the temperature sensor does not appropriately reflect the warm-up state of the engine body due to the refrigerant remaining in the engine body, Since the cooling circuit is switched from the closed state to the open state based on the fuel injection amount or intake air amount correlated with the state, the cooling circuit can be appropriately opened according to the warm-up state of the engine. become.
Also,According to the above configuration, when the integrated value of the fuel injection amount or the intake air amount from the start of the engine exceeds a predetermined value, the throttle passage is opened through the opening of the second control valve. As described above, when the cooling circuit is opened, the throttle passage having a smaller refrigerant flow rate than the other refrigerant passages is opened, so that the engine due to a rapid flow of low-temperature refrigerant into the engine body. It is possible to suitably suppress the temperature drop. In addition, since the refrigerant staying in the engine main body flows into the throttle body, the throttle body can be warmed up quickly.
[0015]
  (2) Claim 2The described inventionClaim 1In the engine cooling apparatus according to the above description, the gist is that the control means opens the first control valve based on an output value of the temperature sensor after opening the second control valve. .
[0016]
According to the above configuration, after the second control valve is opened, the first control valve is controlled to open based on the output value of the temperature sensor. As described above, when the output value of the temperature sensor reflects the warm-up state of the main body of the engine, the valve opening control of the first control valve is performed based on the output value. The control valve can be appropriately controlled according to the warm-up state of the engine body.
[0017]
  (3) Claim 3The described inventionClaim 2In the engine cooling apparatus described above, the gist is that the control means gradually opens the first control valve when the temperature of the refrigerant flowing out from the main body of the engine exceeds a predetermined temperature.
[0018]
According to the above configuration, the first control valve is gradually opened when the temperature of the refrigerant flowing out from the main body of the engine exceeds a predetermined temperature. As described above, in the valve opening control of the first control valve, the flow rate of the refrigerant flowing through the bypass passage is gradually increased, so that the low-temperature cooling water suddenly flows into the engine body. The temperature drop of the engine body can be suitably suppressed.
[0019]
  (4) Claim 4The described inventionClaims 1 to 3The engine cooling device according to any one of the preceding claims, wherein the engine cooling device is provided with a heat storage container that retains and stores the refrigerant as a refrigerant passage for circulating the refrigerant that cools the main body of the engine. A heat storage passage that constitutes a heat storage circuit for circulating the refrigerant in the heat storage container through the main body of the engine by being selectively connected to the cooling circuit, and the control means is configured to start the engine Prior to operation, the heat storage passage is connected to the cooling circuit to form the heat storage circuit, and the first control valve and the second control valve are opened. The gist is to disconnect from the cooling circuit and to close the first control valve and the second control valve.
[0020]
According to the above configuration, prior to the engine starting operation, the heat storage passage is connected to the cooling circuit to configure the heat storage circuit, and the first control valve and the second control valve are opened. Then, immediately after the engine is started, the heat storage passage is disconnected from the cooling circuit, and the first control valve and the second control valve are closed. In such a configuration, when the refrigerant in the heat storage container is supplied to the main body of the engine, the flow resistance of the refrigerant flowing through the bypass passage and the throttle passage is increased to reduce the refrigerant flow resistance. The flow rate of the refrigerant flowing through the circuit and the heat storage circuit is increased. Accordingly, since the refrigerant in the heat storage container is supplied to the main body of the engine at an early stage prior to the starting operation of the engine, it is possible to favorably promote the warm-up of the engine. In addition, after the engine is started, the heat storage passage is disconnected from the cooling circuit and each control valve is closed, so that low-temperature refrigerant is prevented from flowing back to the main body of the engine. As a result, the temperature drop of the engine body due to the low-temperature refrigerant can be suitably suppressed.
[0021]
  (5) Claim 5The described inventionClaims 1-4The engine cooling device according to any one of claims 1 to 3, wherein the control unit is configured to control the first control valve and the second control valve when an integrated value of a fuel injection amount in a predetermined period exceeds a reference value. The gist is to open the valve.
[0022]
According to the above configuration, the first control valve and the second control valve are opened when the integrated value of the fuel injection amount in a predetermined fixed period exceeds the reference value, that is, when the engine is in a high load operation state. Is done. Incidentally, a sufficient amount of refrigerant is not supplied to the engine body during the warm-up process of the engine body, so if the engine is operated at a high load during such warm-up process, the engine body may be overheated It is done. Therefore, in the above configuration, when the engine is in a high load operation state, a large amount of refrigerant is recirculated to the main body of the engine by opening the bypass passage and the throttle passage. As a result, the cooling performance of the main body of the engine is enhanced, so that the main body of the engine can be suitably protected. Further, since the high load operation state of the engine body is detected based on the fuel injection amount, the output value of the temperature sensor is considered not to appropriately reflect the warm-up state of the engine body ( Even when the integrated value of the fuel injection amount or the intake air amount from the start of the engine does not exceed a predetermined value), the flow rate of the refrigerant returning to the engine body can be increased appropriately.
[0023]
  (6) Claim 6The described inventionClaims 1-5In the engine cooling device according to any one of the preceding claims, the control unit controls the first control valve and the second control valve when an increase degree of an output value of the temperature sensor exceeds a predetermined degree. The gist is to open the valve.
[0024]
  According to the above configuration, when the increase degree of the output value of the temperature sensor exceeds a predetermined degree, that is, when the engine is in a high load operation state, the first control valve and the second control valve are opened. . This makes the aboveClaim 5Similarly to the described invention, since the cooling performance of the engine body is enhanced, the engine body can be suitably protected.
[0025]
  (7) Claim 7The described inventionClaims 1-4The engine cooling device according to any one of claims 1 to 3, wherein the control unit is configured to provide fuel for a predetermined period of time on condition that an integrated value of a fuel injection amount or an intake air amount from the start of the engine is less than a predetermined value. When the integrated value of the injection amount exceeds the reference value, the first control valve and the second control valve are opened, and the integrated value of the fuel injection amount or intake air amount from the start of the engine is a predetermined value. If the degree of increase in the output value of the temperature sensor exceeds a predetermined degree on the condition that the first control valve and the second control valve are opened, the gist of the invention is to open the first control valve and the second control valve.
[0026]
  According to the above configuration, when the integrated value of the fuel injection amount from the start of the engine or the integrated value of the intake air amount is less than the predetermined value, the integrated value of the fuel injection amount in the predetermined period exceeds the reference value. The control valve and the second control valve are opened. Further, when the degree of increase in the output value of the temperature sensor exceeds a predetermined degree when the integrated value of the fuel injection amount or intake air amount from the start of the engine exceeds a predetermined value, the first control valve and the first control valve 2 control valve is opened. This makes the aboveClaim 5Similarly to the described invention, since the cooling performance of the engine body is enhanced, the engine body can be suitably protected. Also, when it is considered that the output value of the temperature sensor does not properly reflect the warm-up state of the engine body, the high-load operation state of the engine body is detected based on the fuel injection amount. Therefore, it becomes possible to appropriately increase the flow rate of the refrigerant returning to the main body of the engine. Further, when the temperature sensor is considered to function effectively, the high load operation state of the engine is detected based on the output value of the temperature sensor. Can be increased more appropriately.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
[0028]
FIG. 1 shows an overall configuration of an engine cooling device 1 having a cooling function of the engine E (engine body).
First, the function of each component provided in the engine cooling device 1 will be described.
[0029]
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.
[0030]
The throttle body 13 has a built-in throttle valve and adjusts the intake air amount according to the opening of the valve.
The heater core 14 performs heat exchange between the cooling water and air for heating the vehicle interior. The heat-exchanged air is supplied to the passenger compartment through a heater.
[0031]
The electric water pump 15 is driven through the battery and pumps the cooling water.
The heat storage container 16 stores the cooling water and insulates the cooling water from the air outside the container. Thereby, the cooling water is stored in the heat storage container 16 while being kept warm.
[0032]
The cooling water delivery pipe 17 allows 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 degree of the thermostat 21 is the minimum opening degree (fully closed), the flow rate of the cooling water flowing into the radiator 12 becomes “0”, and flows into the radiator 12 as the opening degree of the thermostat 21 approaches the maximum opening degree (fully opened). The flow rate of the cooling water is increased.
[0033]
The flow rate control valve 22 can continuously change the opening degree of the valve, and adjusts the flow rate of the cooling water in the flow passage (bypass passage) for bypassing the radiator 12 and circulating the cooling water. To do. When the opening degree of the flow control valve 22 is the minimum opening degree (fully closed), the flow rate of the cooling water flowing through the flow passage becomes “0”, and the opening degree of the flow control valve 22 approaches the maximum opening degree (fully opened). The flow rate of the cooling water flowing through the flow passage increases.
[0034]
The on-off valve 23 can be switched to either open or closed, and switches the flow mode of the cooling water in the flow passage (throttle passage) for allowing the cooling water to flow 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, while when the on-off valve 23 is in the closed state, the cooling water is not supplied to the throttle body 13.
[0035]
The three-way valve 24 includes three ports (a first port P1, a second port P2, and a third port P3), and selectively changes the circulation mode of the cooling water by changing the open / close state between these ports. Switch.
[0036]
The electronic control unit (ECU) 3 comprehensively controls the injector INJ of the engine E, the electric water pump 15, the flow control valve 22, the on-off valve 23, and the three-way valve 24. The control means includes an ECU 3.
[0037]
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 from the engine E (engine water temperature THwe).
[0038]
The heat storage container water temperature sensor S2 detects the temperature of the cooling water in the heat storage container 16 (heat storage container water temperature THwt).
The ECU 3 also monitors the amount of fuel injected by the injector INJ.
[0039]
Next, the flow path of the cooling water in the engine cooling device 1 will be described.
The first cooling passage R <b> 1 connects the engine E and the first port P <b> 1 of the three-way valve 24.
[0040]
The second cooling passage R <b> 2 connects the engine E and the thermostat 21.
The third cooling passage R3 connects the first cooling passage R1 and the radiator 12.
The fourth cooling passage R <b> 4 connects the radiator 12 and the thermostat 21.
[0041]
The fifth cooling passage R5 connects the first cooling passage R1 and the flow control valve 22.
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 communicates with the second cooling passage R2 regardless of the open / close state of the thermostat 21.
[0042]
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.
[0043]
The tenth cooling passage R <b> 10 connects the second port P <b> 2 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 / closed state of the thermostat 21.
[0044]
The twelfth cooling passage R <b> 12 connects the third port P <b> 3 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.
[0045]
The fourteenth cooling passage R <b> 14 connects the heat storage container 16 and the cooling water delivery pipe 17.
Through the cooling passages, a radiator passage, a bypass passage, a throttle passage, a heater passage, and a heat storage passage, which will be described below, are configured.
[0046]
[Radiator passage]
A radiator passage is constituted by the third cooling passage R3 and the fourth cooling passage R4.
The radiator passage is opened when the thermostat 21 is opened, and is closed when the thermostat 21 is closed.
[0047]
When the radiator passage is open, cooling water flows through the radiator 12.
[Bypass passage]
The fifth cooling passage R5 and the sixth cooling passage R6 constitute a bypass passage.
[0048]
The bypass passage is opened when the flow control valve 22 is open, and is closed when the flow control valve 22 is closed.
When the bypass passage is opened, the cooling water circulates bypassing the radiator 12.
[0049]
[Throttle passage]
The seventh cooling passage R7, the eighth cooling passage R8, and the ninth cooling passage R9 constitute a throttle passage.
[0050]
The throttle passage is opened when the opening / closing valve 23 is open, and is closed when the opening / closing valve 23 is closed.
When the throttle passage is open, the cooling water flows through the throttle body 13.
[0051]
[Heater passage]
The tenth cooling passage R10 and the eleventh cooling passage R11 constitute a heater passage.
[0052]
The heater passage can be selectively connected to the first cooling passage R <b> 1 through control of the three-way valve 24.
The heater passage is connected to the first cooling passage R1 when the first port P1 and the second port P2 of the three-way valve 24 are open (the heater passage is opened), while the three-way valve 24 is connected. When one of the first port P1 and the second port P2 is closed, the first cooling passage R1 is disconnected (the heater passage is closed).
[0053]
When the heater passage is opened, 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 constitute a heat storage passage.
[0054]
The heat storage passage can be selectively connected to the first cooling passage R <b> 1 through the control of the three-way valve 24.
The heat storage passage is connected to the first cooling passage R1 when the first port P1 and the third port P3 of the three-way valve 24 are open (the heat storage passage is opened), while the three-way valve 24 is connected. When either the first port P1 or the third port P3 is closed, the first cooling passage R1 is disconnected (the heat storage passage is closed).
[0055]
When the heat storage passage is opened, the cooling water flows through the heat storage container 16.
The throttle passage has a smaller diameter of the flow passage than the radiator passage, the bypass passage, the heater passage, and the heat storage passage.
[0056]
The following circulation circuits for circulating the cooling water are constituted by the cooling passages.
[Cooling circuit]
First cooling passage R1, second cooling passage R2, radiator passage (third cooling passage R3, fourth cooling passage R4), bypass passage (fifth cooling passage R5, sixth cooling passage R6), throttle passage (seventh cooling passage) The passage R7, the eighth cooling passage R8, the ninth cooling passage R9) and the heater passage (the tenth cooling passage R10, the eleventh cooling passage R11) constitute a cooling circuit.
[0057]
The cooling circuit is open when at least one of the radiator passage, the bypass passage, the throttle passage, and the heater passage is open, and is closed when all of the cooling passages are closed.
[0058]
When cooling water circulates through the cooling circuit, heat exchange is performed between the engine E and the cooling water.
When cooling water circulates through the radiator passage, heat is exchanged between the cooling water and the outside air in the radiator 12.
[0059]
When the cooling water circulates through the bypass passage, the heat dissipation of the cooling water in the radiator 12 is suppressed.
When cooling water circulates through the throttle passage, heat is exchanged between the throttle body 13 and the cooling water.
[0060]
When the cooling water circulates through the heater passage, heat exchange is performed between the vehicle interior heating air and the cooling water in the heater core 14.
[Heat storage circuit]
A heat storage circuit is configured by the first cooling passage R1 and the heat storage passage (the twelfth cooling passage R12, the thirteenth cooling passage R13, and the fourteenth cooling passage R14).
[0061]
The heat storage circuit is opened when the heat storage passage is connected to the cooling circuit (first cooling passage R1), while the heat storage passage is closed when the heat storage passage is disconnected from the cooling circuit.
[0062]
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 opened, heat exchange is further performed between the cooling water stored in the heat storage container 16 and the throttle body 13.
[0063]
When the first port P1 and the second port P2 of the three-way valve 24 are opened, heat exchange is further performed between the cooling water stored in the heat storage container 16 in the heater core 14 and the air for heating the vehicle interior. Is done.
[0064]
By the way, generally, it is desired that the warm-up of the engine E is completed earlier.
Here, in order to realize such early warm-up of the engine E, for example, it is conceivable that the cooling circuit is closed when the engine E is warmed up and the cooling water is retained in the engine E. When trying to promote warm-up, it is possible to cause the following problems.
[0065]
That is, since the cooling water stays in the engine E, the warm-up state of the engine E is not reflected in the output value of the engine water temperature sensor S1, so that the cooling circuit is appropriately opened according to the warm-up state of the engine E. It becomes difficult.
[0066]
Therefore, in the present embodiment, in consideration of such a case, the cooling water circulation mode is controlled through a cooling device control process at the time of engine warm-up described below.
[0067]
Hereinafter, with reference to FIG. 2 and FIG. 3, the “cooling device control process during engine warm-up” for controlling the cooling water circulation mode during engine warm-up will be described. Note that this processing corresponds to processing performed through the control means.
[0068]
[Cooling device control process when engine is warming up]
This process is started when the engine E is started, and is ended after the processes of steps S101 to S109 described below are performed.
[0069]
[Step S101] The following operations [a] to [c] are performed.
[A] The flow control valve 22 is fully closed.
[B] The on-off valve 23 is closed.
[C] All the ports of the three-way valve 24 are closed.
[0070]
Through these operations, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are closed.
Thereby, the cooling circuit is closed and the heat storage passage is disconnected from the cooling circuit.
[0071]
[Step S102] An integrated value (fuel injection amount integrated value FiA) of the fuel injection amount after the engine E is started is calculated.
[Step S103] It is determined whether the fuel injection amount integrated value FiA is equal to or greater than a predetermined value (predetermined integrated value FiX). That is, the following conditions
FiA ≧ FiX
It is determined whether or not is satisfied.
[0072]
When the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, the processes in steps S102 and S103 are repeatedly executed at predetermined intervals.
The predetermined integrated value FiX is used as a fuel injection amount integrated value threshold value indicating whether or not there is a risk of significant temperature unevenness in the engine E due to the retention of cooling water in the engine E. . That is, when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, there is no possibility that significant temperature unevenness occurs in the engine E.
[0073]
[Step S104] When the fuel injection amount integrated value FiA is greater than or equal to the predetermined integrated value FiX, that is, when there is a risk of significant temperature unevenness in the engine E, the on-off valve 23 is opened.
[0074]
Through this operation, the throttle passage is opened and the cooling circuit is switched from the closed state to the open state.
Thereby, cooling water comes to circulate through a cooling circuit.
[0075]
[Step S105] The valve opening control for controlling the flow rate control valve 22 based on the output value (engine water temperature THwe) of the engine water temperature sensor S1 is started.
[Step S106] It is determined whether the engine water temperature THwe is equal to or higher than a predetermined temperature (first predetermined water temperature THx1). That is, the following conditions
THwe ≧ THx1
It is determined whether or not is satisfied.
[0076]
When the engine coolant temperature THwe is lower than the first predetermined coolant temperature THx1, the determination process is repeatedly executed at predetermined intervals.
The first predetermined water temperature THx1 is used as an engine water temperature threshold value indicating whether or not the warm-up state of the engine E has reached a predetermined warm-up state. That is, when the engine water temperature THwe is lower than the first predetermined water temperature THx1, the warm-up state of the engine E has not reached the predetermined warm-up state.
[0077]
[Step S107] When the engine coolant temperature THwe is equal to or higher than the first predetermined coolant temperature THx1, that is, when the warm-up state of the engine E reaches a predetermined warm-up state, the flow control valve 22 is gradually opened.
[0078]
Through this operation, the bypass passage is opened.
As a result, the cooling water circulates through the bypass passage in accordance with the throttle passage.
[0079]
[Step S108] It is determined whether the engine coolant temperature THwe is equal to or higher than a second predetermined coolant temperature THx2. That is, the following conditions
THwe ≧ THx2
It is determined whether or not is satisfied.
[0080]
When the engine coolant temperature THwe is lower than the second predetermined coolant temperature THx2, the determination process is repeatedly executed at predetermined intervals.
The second predetermined water temperature THx2 is set to a value larger than the first predetermined water temperature THx1, and is used as an engine water temperature threshold value indicating whether or not the engine E is in a warm-up completion state. That is, when the engine coolant temperature THwe is lower than the second predetermined coolant temperature THx2, the engine E is not yet warmed up.
[0081]
[Step S109] When the engine water temperature THwe is equal to or higher than the second predetermined water temperature THx2, that is, when the engine E is in the warm-up completion state, the flow control valve 22, the open / close valves 23, and 3 are based on the operating state of the engine E. The control valve opening / closing control for controlling the direction valve 24 is started, and this process is terminated.
[0082]
Thus, according to the cooling device control process at the time of engine warm-up, the control valves are controlled in the following modes [A] to [D].
[A] When the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, the cooling circuit is kept closed.
[B] When the fuel injection amount integrated value FiA becomes equal to or greater than the predetermined integrated value FiX, the cooling circuit is opened and valve opening control for controlling the flow rate control valve 22 based on the engine water temperature THwe is started.
[C] When the engine water temperature THwe becomes equal to or higher than the first predetermined water temperature THx1, the flow control valve 22 is gradually opened.
[D] Open / close control of the control valve that controls the flow control valve 22, the open / close valve 23, and the three-way valve 24 based on the operating state of the engine E when the engine water temperature THwe becomes equal to or higher than the second predetermined water temperature THx2. To start.
[0083]
Here, with reference to FIG. 4, the control mode of the engine cooling device 1 by the cooling device control process (FIGS. 2 and 3) at the time of engine warm-up will be summarized.
When the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, 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 the ports of the three-way valve 24 are closed.
[A4] The electric water pump 15 is stopped.
[0084]
When the fuel injection amount integrated value FiA is not less than the predetermined integrated value FiX and the engine water temperature THwe is lower than the first predetermined water temperature THx1, 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 opened.
[B3] All the ports of the three-way valve 24 are closed.
[B4] The electric water pump 15 is stopped.
[0085]
When the engine water temperature THwe is equal to or higher than the first predetermined water temperature THx1 and the engine water temperature THwe is lower than the second predetermined water temperature THx2, the engine cooling device 1 is controlled in the following modes [C1] to [C4].
[C1] The flow control valve 22 is gradually opened.
[C2] The on-off valve 23 is opened.
[C3] All the ports of the three-way valve 24 are closed.
[C4] The electric water pump 15 is stopped.
[0086]
When the engine coolant temperature THwe is equal to or higher than the second predetermined coolant temperature THx2, the engine cooling device 1 is controlled in the following manner [D1].
[D1] The electric water pump 15, the flow control valve 22, the on-off valve 23, and the three-way valve 24 are controlled according to the operating state of the engine E and the like.
[0087]
The thermostat 21 operates according to the temperature of the cooling water, and is in a closed state until the warm-up of the engine E is completed.
Next, with reference to FIGS. 5 to 7, the circulation mode of the cooling water during engine warm-up will be described. 5 to 7, the cooling passages indicated by solid lines indicate passages through which cooling water flows, the arrows indicate the direction of cooling water flow, and the cooling passages indicated by broken lines indicate passages through which cooling water does not flow. .
[0088]
[Cooling water circulation mode [1]]
With reference to FIG. 5, the circulation mode of the cooling water when “the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX” will be described.
[0089]
At this time, since the thermostat 21 is in a closed state, and the flow control valve 22, the on-off valve 23, and the three-way valve 24 are closed accordingly, the cooling circuit and the heat storage circuit are maintained in a closed state. The
[0090]
As a result, the cooling water stays in the engine E.
[Cooling water circulation mode [2]]
With reference to FIG. 6, the circulation mode of the cooling water when “the fuel injection amount integrated value FiA is not less than the predetermined integrated value FiX and the engine water temperature THwe is lower than the first predetermined water temperature THx1” will be described.
[0091]
At this time, since the on-off valve 23 is opened, the throttle passage is kept open.
As a result, the cooling water circulates through the cooling circuit via the throttle passage.
[0092]
[Cooling water circulation mode [3]]
With reference to FIG. 7, the circulation mode of the cooling water when “the engine water temperature THwe is equal to or higher than the first predetermined water temperature THx1 and lower than the second predetermined water temperature THx2” will be described.
[0093]
At this time, since the flow control valve 22 is opened, the bypass passage is kept open.
Thus, the cooling water circulates through the cooling circuit via the bypass passage in accordance with the throttle passage.
[0094]
Next, functions and effects achieved by the cooling device control process (FIGS. 2 and 3) during engine warm-up will be described.
In this process, when the cooling water is retained in the engine E, the cooling circuit is opened based on the fact that the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX.
[0095]
Thus, when it is considered that the output value of the engine water temperature sensor S1 does not appropriately reflect the warm-up state of the engine E due to the retention of the cooling water in the engine E, the engine E Since the cooling circuit is switched from the closed state to the open state based on the fuel injection amount correlated with the warm-up state, the cooling circuit is appropriately opened according to the warm-up state of the engine E.
[0096]
As a result, when there is a risk of significant temperature irregularities in the engine E, cooling water is supplied to the engine E, so that the engine E is maintained in a suitable operating state.
[0097]
In this process, the throttle passage is opened when the fuel injection amount integrated value FiA becomes equal to or greater than a predetermined integrated value FiX.
Thus, when the cooling circuit is opened, the throttle passage having a smaller flow rate of cooling water than the other cooling water flow passages is opened, so that the low-temperature cooling water rapidly flows into the engine E. As a result, the temperature drop of the engine E is suppressed.
[0098]
As a result, when the engine water temperature sensor S1 effectively functions through circulation of the cooling water, the warm-up state of the engine E is suitably maintained.
Further, since the cooling water staying in the engine E flows into the throttle body 13, the throttle body 13 can be warmed up early.
[0099]
In the present process, when the cooling water is circulated through the engine E due to the opening of the cooling circuit, the valve opening control for controlling the flow rate control valve 22 based on the engine water temperature THwe is started. ing.
[0100]
Thus, when the output value of the engine water temperature sensor S1 reflects the warm-up state of the engine E, the flow rate control valve 22 is controlled based on the engine water temperature THwe. The control valve 22 is appropriately controlled according to the warm-up state of the engine E.
[0101]
In this process, when the engine coolant temperature THwe becomes equal to or higher than the first predetermined coolant temperature THx1, the flow control valve 22 is gradually opened.
Thus, in the valve opening control of the flow rate control valve 22, the flow rate of the cooling water flowing through the bypass passage is gradually increased, so that the engine due to the rapid flow of low-temperature cooling water into the engine E. The temperature drop of E is suppressed.
[0102]
Next, an example of the control mode of the engine cooling device 1 by the “cooling device control process during engine warm-up” will be described with reference to FIG.
It is assumed that the engine E is started at time t81.
[0103]
At this time,
[A] The flow control valve 22 is closed.
[B] The on-off valve 23 is closed.
[C] All the ports of the three-way valve 24 are closed.
Each of the above operations is performed.
[0104]
Thereby, since the cooling water stays in the engine E, warm-up of the engine E is promoted.
It is assumed that the fuel injection amount integrated value FiA becomes equal to or greater than a predetermined integrated value FiX at time t82 (FIG. 8: [d]).
[0105]
At this time,
[B] The on-off valve 23 is opened.
The above operation is performed.
[0106]
As a result, the cooling circuit is opened and the cooling water is circulated, so that the engine water temperature sensor S1 shows an output value reflecting the warm-up state of the engine E, and the throttle body 13 is warmed up. It becomes like this.
[0107]
It is assumed that the engine water temperature THwe becomes equal to or higher than the first predetermined water temperature THx1 at time t83 (FIG. 8: [e]).
At this time,
[A] The flow control valve 22 is gradually opened.
The above operation is performed.
[0108]
As a result, the temperature drop of the engine E due to the rapid flow of the low-temperature cooling water into the engine E via the bypass passage is suppressed.
It is assumed that the engine water temperature THwe becomes equal to or higher than the second predetermined water temperature THx2 at time t84 (FIG. 8: [e]).
[0109]
Thereafter, the flow control valve 22, the on-off valve 23, and the three-way valve 24 are controlled based on the operating state of the engine E and the like.
As described above in detail, according to the engine cooling apparatus of the first embodiment, the following excellent effects can be obtained.
[0110]
(1) In the present embodiment, when the cooling water is retained in the engine E, the cooling circuit is opened based on the fact that the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX. ing. Thus, when it is considered that the output value of the engine water temperature sensor S1 does not appropriately reflect the warm-up state of the engine E due to the retention of the cooling water in the engine E, the engine E Since the cooling circuit is switched from the closed state to the open state based on the fuel injection amount correlated with the warm-up state, the cooling circuit can be appropriately opened according to the warm-up state of the engine E. Become.
[0111]
(2) Further, when there is a possibility that significant temperature unevenness occurs in the engine E, the cooling water is supplied to the engine E, so that the engine E can be maintained in a suitable operating state.
[0112]
(3) In the present embodiment, the throttle passage is opened when the fuel injection amount integrated value FiA becomes equal to or greater than a predetermined integrated value FiX. Thus, when the cooling circuit is opened, the throttle passage having a smaller flow rate of cooling water than the other cooling water flow passages is opened, so that the low-temperature cooling water rapidly flows into the engine E. Thus, it is possible to suitably suppress the temperature drop of the engine E. As a result, when the engine water temperature sensor S1 functions effectively through the circulation of the cooling water, the warm-up state of the engine E can be suitably maintained.
[0113]
(4) Further, since the cooling water staying in the engine E flows into the throttle body 13, the throttle body 13 can be warmed up early. (5) In the present embodiment, when the cooling water is circulated through the engine E due to the opening of the cooling circuit, the valve opening control for controlling the flow rate control valve 22 based on the engine water temperature THwe. Like to start. Thus, when the output value of the engine water temperature sensor S1 reflects the warm-up state of the engine E, the flow rate control valve 22 is controlled based on the engine water temperature THwe. The control valve 22 can be appropriately controlled according to the warm-up state of the engine E.
[0114]
(6) In the present embodiment, when the engine water temperature THwe becomes equal to or higher than the first predetermined water temperature THx1, the flow control valve 22 is gradually opened. As described above, in the valve opening control of the flow rate control valve 22, the flow rate of the cooling water flowing through the bypass passage is gradually increased, so that the low-temperature cooling water suddenly flows into the engine E. Therefore, the temperature drop of the engine E can be suitably suppressed.
[0115]
Note that the first embodiment can be implemented as, for example, the following form, which is appropriately changed.
In the first embodiment, the throttle passage is opened when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX. However, for example, the following changes may be made. . That is, when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, the bypass passage can be opened together with the throttle passage.
[0116]
In the first embodiment, when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, the cooling circuit is opened through the opening of the throttle passage. It can be appropriately selected from a passage, a throttle passage, and a heater passage. In short, if the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, the control mode allows circulation of the coolant through the engine E by opening an appropriate cooling passage. The cooling passage to be opened can be changed as appropriate.
[0117]
In the first embodiment, the cooling circuit is opened based on the fact that the fuel injection amount integrated value FiA is greater than or equal to the predetermined integrated value FiX. However, for example, the following modifications can be made. is there. That is, the heat storage circuit can be opened based on the fact that the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX.
[0118]
In the first embodiment, the flow rate control valve 22 is gradually opened when the engine water temperature THwe becomes equal to or higher than the first predetermined water temperature THx1, but may be changed as follows, for example. Is possible. That is, even when the engine water temperature THwe becomes equal to or higher than the first predetermined water temperature THx1, the flow rate control valve 22 is not opened and the bypass passage is closed until the engine water temperature THwe becomes equal to or higher than the second predetermined water temperature THx2. It can also be maintained in a state.
[0119]
In the first embodiment, the cooling circuit is opened based on the fact that the fuel injection amount integrated value FiA is greater than or equal to the predetermined integrated value FiX. However, for example, the following modifications can be made. is there. That is, based on the fact that the integrated value of the intake air amount (intake air amount integrated value QiA) since the start of the engine E is calculated and this integrated value is greater than or equal to a predetermined value (predetermined integrated value QiX), The cooling circuit can also be opened. The predetermined integrated value QiX is used as a threshold value for an integrated intake air amount value indicating whether or not there is a risk of significant temperature unevenness in the engine E due to the retention of cooling water in the engine E. . That is, when the intake air amount integrated value QiA is less than the predetermined integrated value FiX, there is no possibility that the engine E will have a significant temperature unevenness.
[0120]
In the first embodiment, the flow rate control valve 22 is gradually opened when the engine water temperature THwe becomes equal to or higher than the first predetermined water temperature THx1, but the control mode of the flow rate control valve 22 is such The control mode is not limited and can be changed as appropriate.
[0121]
In the first embodiment, the cooling circuit is closed by closing the flow control valve 22, the on-off valve 23, and the three-way valve 24. However, for example, the following change is possible. It is. That is, a control valve for opening and closing the cooling passage R2 is provided in the second cooling passage R2, and the cooling circuit can be closed by closing the control valve.
[0122]
Alternatively, a control valve that opens and closes the cooling passage R1 is provided in the first cooling passage R1 (a location upstream of the connection portion between the first cooling passage R1 and the bypass passage), and the control valve is closed. The cooling circuit can also be closed. In short, the engine cooling device 1 can be provided with an appropriate control valve as long as the cooling circuit can be appropriately opened and closed.
[0123]
In the first embodiment, the present invention is applied to the engine cooling device 1 having the heat storage passage. However, the present invention may be applied to the engine cooling device 1 having no heat storage passage. Is possible. Even in the case of adopting such a configuration, the function and effect similar to the function and effect of the first embodiment can be achieved.
[0124]
(Second Embodiment)
A second embodiment embodying the present invention will be described with reference to FIGS. In addition, since the structure of the whole apparatus in this Embodiment is the structure similar to the said 1st Embodiment, the overlapping description is omitted.
[0125]
By the way, since a sufficient amount of cooling water is not supplied to the engine E during the warm-up process of the engine E, if the engine E is operated at a high load during such a warm-up process, the engine E falls into an overheated state and the operation performance It is possible to cause deterioration.
[0126]
Therefore, in the present embodiment, in consideration of such a case, the engine cooling process described below is performed in the warm-up process of the engine E.
In the present embodiment, the engine cooling process is performed in parallel with the “cooling device control process during engine warm-up” (FIGS. 2 and 3).
[0127]
Hereinafter, with reference to FIG. 9 and FIG. 10, “engine cooling processing” performed to avoid an overheated state of the engine will be described. Note that this process is performed when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, and when the fuel injection amount integrated value FiA is greater than or equal to the predetermined integrated value FiX. The “second engine cooling process” is performed.
[0128]
[First engine cooling process]
This process is started together with the “cooling device control process during engine warm-up”, and is repeatedly executed at predetermined intervals until the fuel injection amount integrated value FiA becomes equal to or greater than the predetermined integrated value FiX.
[0129]
[Step S201] It is determined whether or not the fuel injection amount integrated value FiA is less than a predetermined integrated value FiX. That is, the following conditions
FiA <FiX
It is determined whether or not is satisfied.
[0130]
When the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, this process is terminated.
[Step S202] It is determined whether or not the integrated value (period integrated value ΔFiA) of the fuel injection amount of the injector INJ in a predetermined fixed period Tx is equal to or greater than a reference value (predetermined period integrated value ΔFiX). That is, the following conditions
△ FiA ≧ △ FiX
It is determined whether or not is satisfied.
[0131]
The predetermined period integrated value ΔFiX is used as a threshold for the period integrated value indicating whether or not the engine E is in a high load operation state. That is, when the period integration value ΔFiA is equal to or greater than the predetermined period integration value ΔFiX, the engine E is in a high load operation state.
[0132]
A predetermined value set in advance is used as the predetermined fixed period Tx.
[Step S203] When the period integration value ΔFiA is equal to or greater than the predetermined period integration value ΔFiX, that is, when the engine E is in a high load operation state, the following operations [a] to [c] are performed.
[A] Fully open the flow control valve 22.
[B] The on-off valve 23 is opened.
[C] All ports of the three-way valve 24 are opened.
[0133]
Through these operations, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened.
The process of step S203 is performed with priority over the control valve control according to the “cooling device control process during engine warm-up” (FIGS. 2 and 3). That is, even when the flow control valve 22, the on-off valve 23, and the three-way valve 24 are closed through the “cooling device control process when the engine is warmed up”, each of these control valves is set through the process of step S203. The valve is forcibly opened.
[0134]
[Step S204] When the period integration value ΔFiA is less than the predetermined period integration value ΔFiX, the flow rate control valve 22, the on-off valve 23, and the three-way valve 24 are set to “cooling device control process during engine warm-up” (FIG. 2). And control according to the control mode of FIG.
[0135]
Thus, according to the first engine cooling process, the engine E is cooled in the following mode [C].
[C] When the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, it is determined whether or not the engine E is in a high load operation state based on the fuel injection amount of the injector INJ. Sometimes, all the cooling passages that can be opened and closed are controlled by the control valve.
[0136]
[Second engine cooling process]
This process is started upon completion of the “first engine cooling process”, and is repeatedly executed at predetermined intervals until the engine water temperature THwe becomes equal to or higher than the second predetermined water temperature Tx2.
[0137]
[Step S301] It is determined whether or not the engine coolant temperature THwe is lower than a second predetermined coolant temperature THx2. That is, the following conditions
THwe <THx2
It is determined whether or not is satisfied.
[0138]
When the engine coolant temperature THwe is equal to or higher than the second predetermined coolant temperature THx2, this process is terminated.
[Step S302] It is determined whether or not the degree of increase in the engine water temperature THwe (engine water temperature increase ΔTHwe) is equal to or greater than a predetermined degree (predetermined water temperature increase ΔTHx). That is, the following conditions
△ THwe ≧ △ THx
It is determined whether or not is satisfied.
[0139]
The engine water temperature increase amount ΔTHwe can be calculated based on the amount of change in the engine water temperature THwe during a predetermined period.
Further, the predetermined water temperature increase amount ΔTHx is used as a threshold value for the engine water temperature increase amount indicating whether or not the engine E is in a high load operation state. That is, when the engine water temperature rise amount ΔTHwe is equal to or greater than the predetermined water temperature rise amount ΔTHx, the engine E is in a high load operation state.
[0140]
[Step S303] When the engine water temperature rise amount ΔTHwe is equal to or greater than the predetermined water temperature rise amount ΔTHx, that is, when the engine E is in a high load operation state, the following operations [a] and [b] are performed.
[A] Fully open the flow control valve 22.
[B] All ports of the three-way valve 24 are opened.
[0141]
Through these operations, the bypass passage, the heater passage, and the heat storage passage are opened.
The process of step S303 is performed with priority over the control valve control according to the “cooling device control process during engine warm-up” (FIGS. 2 and 3). That is, even when the three-way valve 24 is closed through the “cooling device control process during engine warm-up”, all the ports of the three-way valve 24 are forcibly opened through the process of step S303. The
[0142]
[Step S304] When the engine water temperature increase amount ΔTHwe is less than the predetermined water temperature increase amount ΔTHx, the flow rate control valve 22 and the three-way valve 24 are “cooling device control process when the engine is warmed up” (FIGS. 2 and 3). Control according to the control mode.
[0143]
Thus, according to the second engine cooling process, the engine E is cooled in the following mode [D].
[D] When the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, it is determined whether or not the engine E is in a high-load operation state based on the output value of the engine water temperature sensor S1, and the engine E has a high load During operation, all the cooling passages that can be opened and closed are opened through the control of the control valve.
[0144]
Here, with reference to FIG. 11, the control mode of the engine cooling device 1 by the engine cooling process (FIGS. 9 and 10) will be summarized.
When the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX and the period integrated value ΔFiA is equal to or greater than the predetermined period integrated value ΔFiX, the engine cooling device 1 controls in the following modes [C1] to [C4]. Is done.
[C1] The flow control valve 22 is fully opened.
[C2] The on-off valve 23 is opened.
[C3] All the ports of the three-way valve 24 are opened.
[C4] The electric water pump 15 is stopped.
[0145]
When the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX and the engine water temperature increase amount ΔTHwe is equal to or greater than the predetermined water temperature increase amount ΔTHx, the engine cooling device 1 has the following modes [D1] to [D4]. Be controlled.
[D1] The flow control valve 22 is fully opened.
[D2] The on-off valve 23 is opened.
[D3] All the ports of the three-way valve 24 are opened.
[D4] The electric water pump 15 is stopped.
[0146]
Next, with reference to FIG. 12, the circulation mode of the cooling water during the high-load operation of the engine will be described. In FIG. 12, a cooling passage indicated by a solid line indicates a passage through which 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.
[0147]
[Cooling water circulation mode [4]]
When any of these conditions such as “the period integrated value ΔFiA is equal to or greater than the predetermined period integrated value ΔFiX” and “the engine water temperature increase ΔTHwe is equal to or greater than the predetermined water temperature increase ΔTHx” is satisfied, the flow rate control is performed. Since the valve 22, the on-off valve 23, and the three-way valve 24 are opened, the cooling circuit and the heat storage circuit are kept open.
[0148]
As a result, the cooling water circulates through the cooling circuit via the bypass passage, the throttle passage, and the heater passage, and also circulates through the heat storage circuit.
Next, the effects obtained by the engine cooling process (FIGS. 9 and 10) will be described.
[0149]
In this process, when the engine E is in a high load operation state when the engine E is warmed up, all the cooling passages that can be opened and closed are opened through the control of the control valve.
As described above, when the engine E is likely to be overheated, a large amount of cooling water is recirculated to the engine E, so that the engine E can be suitably protected.
[0150]
In this process, when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, whether or not the engine E is in a high-load operation state is compared with the period integrated value ΔFiA and the predetermined period integrated value ΔFiX. Is determined.
[0151]
Thus, when it is considered that the output value of the engine water temperature sensor S1 does not properly reflect the warm-up state of the engine E, the high-load operation state of the engine E is based on the fuel injection amount of the injector INJ. Therefore, the flow rate of the cooling water recirculated to the engine E is appropriately increased.
[0152]
In this process, when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, whether or not the engine E is in a high load operation state through a comparison between the engine water temperature increase amount ΔTHwe and the predetermined water temperature increase amount ΔTHx. Judgment is made.
[0153]
As described above, when the output value of the engine coolant temperature sensor S1 reflects the warm-up state of the engine E, the high load operation state of the engine E is detected based on the output value of the engine coolant temperature sensor S1. Therefore, the flow rate of the cooling water returned to the engine E is increased more appropriately.
[0154]
Next, an example of the control mode of the engine cooling device 1 by the “cooling device control process during engine warm-up” and the “engine cooling process” will be described with reference to FIG. 13.
[0155]
Assume that the engine E is started at time t131.
At this time,
[A] The flow control valve 22 is closed.
[B] The on-off valve 23 is closed.
[C] All the ports of the three-way valve 24 are closed.
Each of the above operations is performed.
[0156]
As a result, the cooling circuit is closed and the cooling water stays in the engine E, so that warm-up of the engine E is promoted.
It is assumed that the fuel injection amount integrated value FiA becomes equal to or greater than a predetermined integrated value FiX at time t132 (FIG. 13: [d]).
[0157]
At this time,
[B] The on-off valve 23 is opened.
The above operation is performed.
[0158]
As a result, the cooling circuit is opened and the cooling water is circulated, so that the engine water temperature sensor S1 shows an output value reflecting the warm-up state of the engine E, and the throttle body 13 is warmed up. It becomes like this.
[0159]
At time t133, it is assumed that the engine water temperature increase ΔTHwe becomes equal to or greater than a predetermined water temperature increase ΔTHx (FIG. 13: [e]).
At this time,
[A] Fully open the flow control valve 22.
[C] All ports of the three-way valve 24 are opened.
Each of the above operations is performed.
[0160]
Thereby, since a large amount of cooling water is recirculated to the engine E, the engine E is protected.
At time t134, it is assumed that the engine water temperature increase ΔTHwe becomes less than the predetermined water temperature increase ΔTHx (FIG. 13: [e]).
[0161]
At this time,
[A] The flow control valve 22 is closed.
[C] All the ports of the three-way valve 24 are closed.
Each of the above operations is performed.
[0162]
It is assumed that the engine water temperature THwe becomes equal to or higher than the first predetermined water temperature THx1 at time t135 (FIG. 13: [f]).
At this time,
[A] The flow control valve 22 is gradually opened.
The above operation is performed.
[0163]
As a result, the cooling water circulates through the bypass passage, and the temperature drop of the engine E due to the rapid flow of the low-temperature cooling water into the engine E is suppressed.
[0164]
It is assumed that the engine water temperature THwe becomes equal to or higher than the second predetermined water temperature THx2 at time t136 (FIG. 13: [f]).
Thereafter, the flow control valve 22, the on-off valve 23, and the three-way valve 24 are controlled based on the operating state of the engine E and the like.
[0165]
As described above in detail, according to the engine cooling apparatus of the second embodiment, in addition to the effects (1) to (6) of the first embodiment, The effects listed are obtained.
[0166]
(7) In the present embodiment, when the engine E is in a high load operation state when the engine E is warmed up, all the cooling passages that can be opened and closed are opened through the control of the control valve. As described above, when the engine E is likely to be overheated, a large amount of cooling water is recirculated to the engine E, so that the engine E can be suitably protected.
[0167]
(8) In the present embodiment, when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, the high load of the engine E is based on the comparison result between the period integrated value ΔFiA and the predetermined period integrated value ΔFiX. The operation state is detected. Thus, when it is considered that the output value of the engine coolant temperature sensor S1 does not properly reflect the warm-up state of the engine E, the high-load operation state of the engine E is based on the fuel injection amount of the injector INJ. Therefore, it is possible to appropriately increase the flow rate of the cooling water recirculated to the engine E.
[0168]
(9) In the present embodiment, when the fuel injection amount integrated value FiA is greater than or equal to the predetermined integrated value FiX, the engine E temperature increases based on the comparison result between the engine water temperature increase amount ΔTHwe and the predetermined water temperature increase amount ΔTHx. The load operation state is detected. As described above, when the output value of the engine coolant temperature sensor S1 reflects the warm-up state of the engine E, the high load operation state of the engine E is detected based on the output value of the engine coolant temperature sensor S1. Therefore, the flow rate of the cooling water returned to the engine E can be increased more appropriately.
[0169]
In addition, the said 2nd Embodiment can also be implemented as the following forms which changed this suitably, for example.
In the second embodiment, when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, the engine E is cooled through the first engine cooling process (FIG. 9). It is also possible to change as follows. That is, when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, the second engine cooling process (FIG. 10) can be performed instead of the first engine cooling process.
[0170]
Further, when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, the first engine cooling process and the second engine cooling process can be performed together.
In the second embodiment, the engine E is cooled through the second engine cooling process when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX. It is also possible to do. That is, when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, the first engine cooling process can be performed instead of the second engine cooling process.
[0171]
In addition, when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, the first engine cooling process and the second engine cooling process can be performed together.
In the second embodiment, when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX, the engine E is high based on the fact that the period integrated value ΔFiA is equal to or greater than the predetermined period integrated value ΔFiX. Although it has been configured to determine that it is in the load operation state, it can be changed as follows, for example. That is, it is possible to monitor the opening of the accelerator pedal and determine whether or not the engine E is in a high load operation state based on a comparison result between the opening and a predetermined determination value.
[0172]
In the second embodiment, when the fuel injection amount integrated value FiA is equal to or greater than the predetermined integrated value FiX, the engine E is based on the fact that the engine water temperature increase amount ΔTHwe is equal to or greater than the predetermined water temperature increase amount ΔTHx. Although it has been determined that it is in the high-load operation state, it can be changed as follows, for example. That is, it is possible to monitor the opening of the accelerator pedal and determine whether or not the engine E is in a high load state based on the comparison result between the opening and the determination value.
[0173]
In the second embodiment, when the period integrated value ΔFiA is equal to or greater than the predetermined period integrated value ΔFiX, and when the engine water temperature increase ΔTHwe is equal to or greater than the predetermined water temperature increase ΔTHx, Although all the cooling passages that can be opened and closed through the control of the control valve are opened, the opening of the cooling passage can be appropriately changed according to the operating state of the engine E or the like.
[0174]
-Moreover, when the cooling water which recirculates to the engine E is ensured enough, it can also be set as the control aspect which does not open an appropriate cooling passage.
In the second embodiment, the present invention is applied to the engine cooling device 1 having the heat storage passage. However, the present invention may be applied to the engine cooling device 1 having no heat storage passage. Is possible. Even in the case of adopting such a configuration, the function and effect similar to the function and effect of the second embodiment can be achieved.
[0175]
(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS. In addition, since the structure of the whole apparatus in this Embodiment is the structure similar to the said 1st Embodiment, the overlapping description is omitted.
[0176]
In the present embodiment, preheating for promoting warm-up of the engine E by supplying warm cooling water (warm water) in the heat storage container 16 to the engine E through the “preheating process” described below at the start of the engine E is performed. Like to do. That is, the present embodiment has a configuration in which a “preheating process” is added to the first embodiment.
[0177]
[Preheat treatment]
The “preheating process” will be described with reference to FIG. This process is started when a request for starting the engine E is detected, and ends after the processes of steps S401 to S405 described below are performed.
[0178]
Incidentally, the start request of the engine E can be detected based on conditions such as “the ignition switch switching position is“ ON ”” or “the door is opened through the vehicle door opening / closing switch”.
[0179]
[Step S401] It is determined whether the engine coolant temperature THwe is lower than the cold determination temperature THwL. That is, the following conditions
THwe <THwL
It is determined whether or not is satisfied.
[0180]
When the engine coolant temperature THwe is equal to or higher than the cold determination temperature THwL, the processes in the following steps S402 to S405 are omitted and the present process is terminated.
Incidentally, the cold determination temperature THwL is used as a cooling water temperature threshold indicating whether or not the engine E is in a cold state. That is, when the engine water temperature THwe is lower than the cold determination temperature THwL, the engine E is in a cold state.
[0181]
[Step S402] When the engine coolant temperature THwe is lower than the cold determination temperature THwL, the following operations [a] to [c] are performed.
[A] Fully open the flow control valve 22.
[B] The on-off valve 23 is opened.
[C] All ports of the three-way valve 24 are opened.
[0182]
Through these operations, the bypass passage, the throttle passage, the heater passage, and the heat storage passage are opened.
[Step S403] The electric water pump 15 is driven.
[0183]
Through this operation, the cooling water is circulated in the heat storage circuit and the cooling circuit. As a result, the hot water stored in the heat storage container 16 flows into the engine E.
[0184]
[Step S404] It is determined whether the driving period Tpm of the electric water pump 15 is equal to or longer than a predetermined period TpmX. That is, the following conditions
Tpm ≧ TpmX
It is determined whether or not is satisfied.
[0185]
When the above condition is not satisfied, the above determination process is repeatedly executed every predetermined period.
Incidentally, the predetermined drive period TpmX indicates the time until the hot water stored in the heat storage container 16 is sufficiently supplied into the engine E, and is set according to the capacity of the heat storage container 16 and the size of the engine E. can do.
[0186]
[Step S405] When the driving period Tpm of the electric water pump 15 becomes equal to or longer than the predetermined period TpmX, the electric water pump 15 is stopped and the process is terminated.
[0187]
Thereby, the circulation of the cooling water in the engine cooling device 1 is stopped.
Thus, according to the preheating process, the engine E is warmed up in the following mode [E].
[E] When the engine E is started in a cold state, the flow control valve 22, the on-off valve 23, and the three-way valve 24 are opened and hot water in the heat storage container 16 is supplied to the engine E.
[0188]
Here, with reference to FIG. 15, the control aspect of the engine cooling device 1 by the preheating process (FIG. 14) will be summarized.
When the engine water temperature THwe is lower than the cold determination temperature THwL, the engine cooling device 1 is controlled in the following modes [E1] to [E4].
[E1] The flow control valve 22 is fully opened.
[E2] The on-off valve 23 is opened.
[E3] All the ports of the three-way valve 24 are opened.
[E4] The electric water pump 15 is driven.
[0189]
When the engine coolant temperature THwe is equal to or higher than the cold determination temperature THwL, the special control for the engine cooling device 1 is not performed.
Next, with reference to FIG. 16, the cooling water circulation mode during preheating will be described. In FIG. 16, a cooling passage indicated by a solid line indicates a passage through which 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.
[0190]
[Cooling water circulation mode [5]]
Since the flow control valve 22, the on-off valve 23, and the three-way valve 24 are opened during preheating, the heat storage circuit and the cooling circuit are maintained in an open state.
[0191]
Thus, the cooling water circulates through the heat storage circuit and also circulates through the cooling circuit via the bypass passage, the throttle passage, and the heater passage.
Next, the effects obtained through the preheating process (FIG. 14) will be described.
[0192]
In this process, the hot water in the heat storage container 16 is supplied to the engine E prior to the starting operation of the engine E.
Thereby, warm-up promotion of the engine E comes to be achieved.
[0193]
In this process, when the hot water in the heat storage container 16 is supplied to the engine E, the bypass passage, the throttle passage, and the heater passage are opened in accordance with the heat storage passage.
[0194]
Thereby, the flow resistance of the cooling water is reduced and the warm water in the heat storage container 16 is supplied into the engine E at an early stage, so that the engine E is warmed up earlier.
[0195]
Next, with reference to FIG. 17, an example of the control mode of the engine cooling device 1 by the “preheating process” and the “cooling device control process during engine warm-up” will be described.
[0196]
Assume that a start request for the engine E is detected at time t171 (FIG. 17: [b]).
At this time, if the engine water temperature THwe is lower than the cold determination temperature THwL,
[A] Fully open the flow control valve 22.
[B] The on-off valve 23 is opened.
[C] All ports of the three-way valve 24 are opened.
[F] The electric water pump 15 is driven.
Each of the above operations is performed.
[0197]
Thereby, since the circulation of the cooling water is performed in a state where the flow resistance of the cooling water is reduced, the hot water in the heat storage container 16 is supplied to the engine E at an early stage.
It is assumed that the driving period Tpm of the electric water pump 15 becomes equal to or longer than the predetermined period TpmX at time t172 (FIG. 17: [f]).
[0198]
At this time,
[F] The electric water pump 15 is stopped.
The above operation is performed.
[0199]
Assume that the engine E is started at time t173 (FIG. 17: [a]).
At this time,
[A] The flow control valve 22 is closed.
[B] The on-off valve 23 is closed.
[C] All the ports of the three-way valve 24 are closed.
Each of the above operations is performed.
[0200]
Thereafter, the engine cooling device 1 is controlled in accordance with the cooling device control process when the engine is warmed up.
As described in detail above, according to the engine cooling apparatus of the third embodiment, in addition to the effects (1) to (6) of the first embodiment, The effects listed are obtained.
[0201]
(10) In the present embodiment, the hot water in the heat storage container 16 is supplied to the engine E prior to the starting operation of the engine E. Thereby, warm-up promotion of the engine E can be aimed at suitably.
[0202]
(11) In this embodiment, when the hot water in the heat storage container 16 is supplied to the engine E, the bypass passage, the throttle passage, and the heater passage are opened in accordance with the heat storage passage. Thereby, the flow resistance of the cooling water is reduced, and the warm water in the heat storage container 16 is supplied to the engine E at an early stage, so that the warm-up of the engine E can be promoted more suitably.
[0203]
(12) In the present embodiment, when the hot water in the heat storage container 16 is sufficiently supplied to the engine E (when the driving period Tpm of the electric water pump 15 becomes equal to or longer than the predetermined period TpmX), the electric water pump 15 Like to stop. Thereby, since the low-temperature cooling water is not recirculated to the engine E, the temperature drop of the engine E due to the low-temperature cooling water can be suitably suppressed.
[0204]
Note that the third embodiment can be implemented as an appropriate modification of the above, for example, as follows.
The above third embodiment can be applied to the second embodiment. That is,
[I] “Cooling device control process when engine is warming up (FIGS. 2 and 3)”
[B] “Engine cooling process (FIGS. 9 and 10)”
[C] "Preheat treatment (Fig. 14)"
These processes can also be performed together.
[0205]
In the third embodiment, it is possible to add the following determination process to the preheating process (FIG. 14). That is, immediately before or after step S401, it is determined whether or not the temperature of the cooling water in the heat storage container 16 (heat storage container water temperature THwt) is equal to or higher than a predetermined determination temperature.
[A] When the heat storage container water temperature THwt is equal to or higher than a predetermined determination temperature, the subsequent processes are sequentially executed.
[B] When the heat storage container water temperature THwt is lower than a predetermined determination temperature, the preheating process is terminated.
Preheating treatment can also be performed in such a manner. When such a configuration is adopted, warm-up of the engine E can be promoted accurately.
[0206]
In the third embodiment, it is possible to add the following determination process to the preheating process (FIG. 14). That is, immediately before or after step S401, it is determined whether or not the temperature of the cooling water in the heat storage container 16 (heat storage container water temperature THwt) is equal to or higher than the engine water temperature THwe.
[A] When the heat storage container water temperature THwt is equal to or higher than the engine water temperature THwe, the subsequent processing is sequentially executed.
[B] When the heat storage container water temperature THwt is lower than the engine water temperature THwe, the preheating process is terminated.
Preheating treatment can also be performed in such a manner. By adopting such a configuration, the low-temperature cooling water stored in the heat storage container 16 is not supplied to the engine E, so that a decrease in the warm-up performance of the engine E can be suitably suppressed.
[0207]
In the third embodiment, it is determined whether or not the engine coolant temperature THwe is lower than the cold determination temperature THwL, and the processing of steps S402 to S405 is performed when this condition is satisfied. However, it is also possible to change as follows, for example. That is, the determination process in step S401 can be omitted, and the processes in and after step S402 can be performed every time the engine E is started. When such a configuration is adopted, it is not necessary to monitor the engine water temperature THwe in the preheating process, so that the process can be simplified.
[0208]
In the third embodiment, the preheat is performed based on the fact that the engine water temperature THwe is lower than the cold determination temperature THwL. However, for example, the following modifications can be made. That is, preheating can be performed based on the fact that the engine water temperature THwe is lower than the temperature of the outside air.
[0209]
In the third embodiment,
[A] “Ignition switch switching position is“ ON ””
[B] “The door was opened through the vehicle door open / close switch”
Although it is possible to detect the start request of the engine E based on the above conditions, the detection of the start request is not limited to the conditions exemplified in the third embodiment but is detected based on appropriate conditions. be able to.
[0210]
In the third embodiment, the throttle passage is opened when the engine E is preheated. However, the throttle passage can be kept closed.
[0211]
In the third embodiment, the bypass passage is opened when the engine E is preheated. However, the bypass passage can be kept closed.
[0212]
In the third embodiment, the heater passage is opened when the engine E is preheated. However, the heater passage can be kept closed.
(Other embodiments)
Other elements that can be changed in common with each of the above embodiments are listed below.
[0213]
In each of the above embodiments, the thermostat 21 that operates according to the temperature of the cooling water is used. However, for example, the following modifications can be made. That is, an electronic thermostat that can electrically control the open / close state of the valve can also be used. When such a configuration is adopted, in the second embodiment,
[A] “Period integrated value ΔFiA is equal to or greater than predetermined period integrated value ΔFiX”
[B] “Engine water temperature rise ΔTHwe is equal to or greater than predetermined water temperature rise ΔTHx”
When either of these conditions [a] and [b] is satisfied, the flow rate of the cooling water recirculated to the engine E is further increased by opening the electronic thermostat and opening the radiator passage. You can also.
[0214]
In each of the above embodiments, the opening / closing valve 23 is provided in the throttle passage. However, for example, the following changes may be made. That is, a flow rate control valve capable of continuously changing the opening degree of the valve can be provided instead of the on-off valve 23.
[0215]
In each of the above embodiments, the flow rate control valve 22 is provided in the bypass passage. However, for example, the following changes may be made. That is, an on-off valve that can be switched to either open or closed can be provided in place of the flow control valve 22.
[0216]
In each of the above embodiments, the opening and closing of the heater passage and the heat storage passage are switched through the control of the three-way valve 24. However, for example, the following changes may be made. That is, an on-off valve or a flow control valve is provided in each of the heater passage and the heat storage passage, and the opening and closing of the heater passage and the heat storage passage can be switched through control of the provided control valve.
[0217]
In each of the above embodiments, the engine cooling device 1 in which the cooling circuit is configured including the bypass passage, the throttle passage, and the heater passage is assumed, but the configuration of the cooling circuit is the configuration exemplified in each of the above embodiments. The present invention is not limited to this and can be changed as appropriate. In short, a cooling circuit having an arbitrary configuration can be adopted as long as the cooling water can be circulated through the engine E.
[0218]
In each of the above-described embodiments, the present invention has been embodied assuming the engine cooling device 1 illustrated in FIG. 1. However, the configuration of the engine cooling device is not limited to the configuration illustrated in each of the embodiments, and is appropriately configured. Can be adopted. In short, a cooling device for an engine comprising a cooling circuit for circulating cooling water through the engine, a control valve for opening and closing the cooling circuit, and an engine water temperature sensor for detecting the temperature of the cooling water flowing out from the engine. Any cooling device with any configuration can be employed.
[0219]
In each of the above-described embodiments, the present invention is embodied assuming the engine cooling device 1 illustrated in FIG. 1, and therefore, control that can be controlled through the ECU 3 when the fuel injection amount integrated value FiA is less than the predetermined integrated value FiX. Although all the valves are closed, depending on the configuration of the engine cooling device, the present invention can be realized without closing all the control valves. In short, any control mode can be used for the other control valves as long as it is a control mode that closes the control valve that contributes to switching of the open / close state of the cooling circuit in the early warm-up period after the engine is started.
[0220]
In each of the embodiments described above, the engine cooling device 1 is controlled when the engine E is warmed up through the cooling device control process when the engine is warmed up. Is not limited to the configuration exemplified in the above embodiments. In short, an integrated value of the fuel injection amount or intake air amount from the start of the engine is calculated. The configuration of the cooling device control process at the time can be changed as appropriate.
[0221]
Including the above matters, it is finally added that the engine cooling device according to the present invention includes the following technical idea.
(1) As a refrigerant circulation circuit for cooling the main body of the engine, a cooling circuit for circulating the refrigerant through the main body of the engine, and a heat storage container for keeping the refrigerant warm and stored are provided in the heat storage container. A heat storage circuit for circulating the refrigerant through the engine body, a cooling circuit control valve provided in the cooling circuit for opening and closing the cooling circuit, and a heat storage circuit provided in the heat storage circuit. A heat storage circuit control valve that opens and closes, and a temperature sensor that is provided in the main body of the engine and detects the temperature of the refrigerant flowing out of the main body of the engine, and in the initial warm-up from the start of the engine Each of the circulation circuits is closed by closing each control valve, and a refrigerant that cools the engine body through the closure of each of the circulation circuits is supplied to the engine body. In the engine cooling device to be retained in the engine, an integrated value of the fuel injection amount or the intake air amount from the start of the engine is calculated, and at least one of the circulation circuits when the calculated integrated value exceeds a predetermined value An engine cooling apparatus comprising control means for controlling the control valves so as to switch the engine from a closed state to an open state.
[Brief description of the drawings]
FIG. 1 is a schematic diagram schematically showing the overall configuration of a first embodiment that embodies an engine cooling apparatus according to the present invention.
FIG. 2 is a flowchart showing a part of a cooling device control process at the time of engine warm-up performed in the embodiment.
FIG. 3 is a flowchart showing a part of a cooling device control process when the engine is warmed up in the embodiment.
FIG. 4 is a view showing a control mode of the engine cooling device by a cooling device control process at the time of engine warm-up performed in the embodiment.
FIG. 5 is a view showing a cooling water circulation mode (cooling water circulation mode [1]) in the engine warm-up process in the engine cooling device according to the embodiment;
6 is a diagram showing a cooling water circulation mode (cooling water circulation mode [2]) in the engine warm-up process in the engine cooling device of the embodiment. FIG.
FIG. 7 is a view showing a cooling water circulation mode (cooling water circulation mode [3]) in the engine warm-up process in the engine cooling device according to the embodiment;
FIG. 8 is a timing chart showing a control mode at the time of engine warm-up by a cooling device control process at the time of engine warm-up for the engine cooling device of the embodiment;
FIG. 9 is a flowchart showing a first engine cooling process performed in the second embodiment that embodies an engine cooling device according to the present invention;
FIG. 10 is a flowchart showing a second engine cooling process performed in the embodiment;
FIG. 11 is a view showing a control mode of the engine cooling device by engine cooling processing performed in the embodiment.
FIG. 12 is a view showing a cooling water circulation mode (cooling water circulation mode [4]) in the engine warm-up process in the engine cooling device according to the embodiment;
FIG. 13 is a timing chart showing a cooling device control process when the engine is warmed up and a control mode when the engine is warmed up by the engine cooling process for the engine cooling device of the embodiment;
FIG. 14 is a flowchart showing a preheat process performed in the third embodiment of the engine cooling device according to the present invention.
FIG. 15 is a view showing a control mode of the engine cooling device by preheating processing performed in the embodiment.
FIG. 16 is a diagram showing a cooling water circulation mode (cooling water circulation mode [5]) in the engine warm-up process in the engine cooling device according to the embodiment;
FIG. 17 is a timing chart showing a control mode at the time of engine start by preheating processing for the engine cooling device of the embodiment;
[Explanation of symbols]
E ... Engine, 1 ... Engine cooling device, 11 ... Water pump, 12 ... Radiator, 13 ... Throttle body, 14 ... Heater core, 15 ... Electric water pump, 16 ... Heat storage container, 17 ... Delivery pipe for cooling water, 21 ... Thermostat , 22 ... Flow control valve, 23 ... Open / close valve, 24 ... Three-way valve, P1 ... First port, P2 ... Second port, P3 ... Third port, 3 ... Electronic control unit (ECU), S1 ... Engine water temperature sensor , S2 ... thermal 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 ... 7th cooling passage, R8 ... 8th cooling passage, R9 ... 9th cooling passage, R10 ... 10th cooling passage, R11 ... 11th cooling passage, R12 ... 12th cooling passage, R13 ... 13th cooling Road, R14 ... 14 cooling passage.

Claims (7)

A cooling circuit that circulates a refrigerant that cools the main body of the engine through the main body of the engine, and a control valve that opens and closes the cooling circuit and a temperature of the refrigerant flowing out of the main body of the engine are detected in the cooling circuit A temperature sensor, and closing the control valve in the initial warm-up period after starting the engine to close the cooling circuit, and cooling the engine body through the closing of the cooling circuit. In the engine cooling device for retaining the refrigerant to be retained in the main body of the engine,
  The control valve calculates an integrated value of the fuel injection amount or intake air amount from the start of the engine and switches the cooling circuit from the closed state to the open state when the calculated integrated value exceeds a predetermined value. Control means for controlling
  The cooling circuit, as a refrigerant passage for circulating a refrigerant for cooling the main body of the engine, a bypass passage for allowing the refrigerant flowing out from the engine main body to flow into the engine main body by bypassing a radiator, A first control valve for opening and closing the bypass passage as a control valve for opening and closing the cooling circuit, and a throttle passage for allowing the refrigerant flowing out from the main body of the engine to flow into the main body of the engine via the throttle body And a second control valve for opening and closing the throttle passage,
  The control means opens the second control valve when the integrated value exceeds the predetermined value.
  An engine cooling system characterized by that. The engine cooling device according to claim 1,
  The control means opens the first control valve based on the output value of the temperature sensor after opening the second control valve.
  An engine cooling system characterized by that. The engine cooling device according to claim 2,
  The control means gradually opens the first control valve when the temperature of the refrigerant flowing out from the main body of the engine exceeds a predetermined temperature.
  An engine cooling system characterized by that. The engine cooling device according to any one of claims 1 to 3,
  The engine cooling device is provided with a heat storage container for retaining and storing the refrigerant as a refrigerant passage for circulating a refrigerant for cooling the main body of the engine, and is selectively connected to the cooling circuit. A heat storage passage that constitutes a heat storage circuit for circulating the refrigerant in the heat storage container through the main body of the engine;
  Prior to starting the engine, the control means connects the heat storage passage to the cooling circuit to form the heat storage circuit, and opens the first control valve and the second control valve, and the engine Immediately after starting, the heat storage passage is disconnected from the cooling circuit and the first control valve and the second control valve are closed.
  An engine cooling system characterized by that. In the engine cooling device according to any one of claims 1 to 4,
  The control means opens the first control valve and the second control valve when an integrated value of the fuel injection amount in a predetermined fixed period exceeds a reference value.
  An engine cooling system characterized by that. In the engine cooling device according to any one of claims 1 to 5,
  The control means opens the first control valve and the second control valve when the increase degree of the output value of the temperature sensor exceeds a predetermined degree.
  An engine cooling system characterized by that. In the engine cooling device according to any one of claims 1 to 4,
  When the integrated value of the fuel injection amount in a predetermined period exceeds a reference value on the condition that the integrated value is less than the predetermined value, the control means includes the first control valve and the second control valve. Open the valve,
  When the increase value of the output value of the temperature sensor exceeds a predetermined degree on condition that the integrated value exceeds the predetermined value, the first control valve and the second control valve are opened.
  An engine cooling system characterized by that.

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