JP2013133747A - Cooling control device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling control device which prevents occurrence of knocking by separating a cooling path for cooling the periphery of an intake port from a cooling path for cooling a cylinder block and an exhaust port of a cylinder head, and efficiently cooling air flowing through the intake port by controlling the flow of cooling water flowing through a cooling path around the intake port.SOLUTION: This cooling control device includes: a first cooling water circuit 5 for cooling the circumference of an intake port 32 in a cylinder head 3; a second cooling water circuit 6 cooling the circumference of a cylinder cooling passage 21 and an exhaust port 31 in the cylinder head 3, and formed independently of the first cooling water circuit 5; and a control means 53 to control operation of an electric pump 52. The control means 53 controls the operation of the electric pump 52 based on the cooling water temperature in the second cooling water circuit during stop of the electric pump 52.

Description

  The present invention relates to a cooling control device for an internal combustion engine that cools air flowing through an intake port by controlling a flow of cooling water flowing through a cooling path around the intake port of the internal combustion engine.

  In internal combustion engines (hereinafter referred to as “engines”), in order to improve combustibility, the intake air is cooled by knocking that tends to occur by keeping the cylinder block and cylinder head at a certain high temperature and increasing the compression ratio. To prevent it.

For example, as shown in FIG. 6 attached to Japanese Patent Application Laid-Open No. 5-321626 (Patent Document 1), the cooling water passage 08 in the cylinder block 02 of the engine 01 is connected to the intake port 06 side of the cylinder head 04. A cooling water introduction unit 09 provided and a cooling water lead-out unit 011 provided on the exhaust port 07 side of the cylinder head 04 are provided. A cooling water passage 012 in the cylinder head 04 communicates with a cooling water lead-out portion 011 on the engine block side, introduces cooling water from the cylinder block 02 side into the cylinder head 04, and a cylinder The cooling water that has entered the cooling water passage 012 in the head 04 cools the periphery of the exhaust port 07 and the intake port 06 and is discharged from the cooling water outlet 015 provided on the intake port 06 side to the cylinder block 02 side. It is derived to a cooling circuit outside the engine 01.
A cooling water passage 08 in the cylinder block 02 and a cooling water passage 012 in the cylinder head 04 are arranged in series to form a first cooling passage.
In addition, the cooling water passage 012 in the cylinder head 04 is provided with a partition wall 019 along the wall surface of the combustion chamber 05, and the cooling water pipe 020 is opened to the inside (combustion chamber side) of the partition wall 019 so that the intake port 06 side. A technique for improving the knock resistance by forming a second cooling path for positively cooling the combustion chamber wall of the present invention is disclosed.

Japanese Patent Laid-Open No. 5-321662

However, according to Patent Document 1, the cooling water that has cooled the cylinder block 02 cools the exhaust port 07 of the cylinder head 04, returns from the intake port 06 side to the cylinder block 02 side, and is discharged outside the cylinder block 02. Is done.
On the other hand, cooling water from the second cooling path is injected into the cooling water passage 012 on the intake port 06 side to actively cool the combustion chamber wall, but the exhaust port 07 and the intake port 06 are connected to each other. The cooling water passage for cooling is in communication, and there is a limit to cooling the vicinity of the intake port 06, which causes a problem that the air in the intake port cannot be sufficiently cooled.

  Therefore, the present invention has been made in view of such a problem. The cooling path for cooling the periphery of the intake port is separated from the cooling path for cooling the cylinder block and the exhaust port of the cylinder head, and It is an object of the present invention to provide a cooling control device that controls the flow of cooling water flowing through a cooling path to efficiently cool air flowing through an intake port and prevent knocking.

  The present invention achieves such an object, and includes a first cooling water circuit including an intake port cooling water passage provided around an intake port in a cylinder head of an internal combustion engine, and cylinder block cooling provided in the cylinder block of the internal combustion engine. A second cooling water circuit that includes a water passage and an exhaust port cooling water passage provided around the exhaust port in the cylinder head, and is formed independently of the first cooling water circuit; and in the first cooling water circuit A first cooling water circulation device that circulates the cooling water of the second cooling water, a second cooling water temperature detection means that detects the temperature of the cooling water in the second cooling water circuit, and a control means that controls the operation of the first cooling water circulation device. An internal combustion engine cooling control device comprising: the control means based on a temperature detected by the second cooling water temperature detection means while the first cooling water circulation device is stopped. Te, and controls the first cooling water circulation device.

  According to this invention, since the temperature of the cooling water in the first cooling water circuit is not uniform when the first cooling water circulation device is stopped, the cooling water circulation device is operating and is more than in the first cooling water circuit. By controlling the operation of the first cooling water circulation device based on the temperature of the cooling water in the second cooling water circuit having a relatively uniform temperature in the circuit, the surroundings of the intake port can be appropriately cooled, Knocking can be suppressed while keeping the temperature low.

  Preferably, the apparatus further comprises first cooling water temperature detection means for detecting a temperature of the cooling water in the first cooling water circuit, and the control means is configured to drive the first cooling water during driving of the first cooling water circulation device. The first cooling water circulation device may be controlled based on the temperature detected by the temperature detecting means.

  With this configuration, when the first cooling water circulation device is driven, the temperature of the cooling water in the first cooling water circuit is uniform, and therefore the temperature detected by the first cooling water temperature detecting means. By controlling based on the above, cooling around the intake port can be performed more appropriately.

  Preferably, when the temperature detected by the second cooling water temperature detecting means during the stop of the first cooling water circulating device is less than a predetermined value and a predetermined condition is satisfied, the control means It is preferable to provide forcible operation means for forcibly operating the cooling water circulation device.

  With this configuration, even when the temperature detected by the second cooling water temperature detection means is smaller than the predetermined value, the temperature around the intake port locally increases in a situation where the circulation of the cooling water is stopped. There is a case. Therefore, even when the detected temperature is lower than the predetermined value, if the predetermined condition is satisfied, the first cooling water circulation device is forcibly operated to prevent a local temperature increase around the intake port.

  Preferably, the apparatus further comprises stop time measuring means for measuring the stop time of the first cooling water circulation device, and the forcible operation means includes that the stop time measured by the stop time measuring means exceeds a predetermined time. When the predetermined condition is satisfied, the first cooling water circulation device may be forcibly operated.

  With this configuration, even when the temperature in the second cooling water circulation circuit is difficult to rise, such as immediately after the engine is started, the first cooling water circulation device is forcibly operated when a predetermined time or more has elapsed since the engine start. A local temperature increase around the intake port can be prevented, and a local temperature increase around the intake port can be prevented.

  Preferably, an intake air temperature detecting means for detecting the temperature of the intake air flowing into the intake port is provided, and the forced operating means is configured to check that the intake air temperature detected by the intake air temperature detecting means exceeds a predetermined value. When the predetermined condition is included, the first cooling water circulation device may be forcibly operated.

  With this configuration, the temperature of the intake air flowing into the intake port is detected by the intake air temperature detection means, and the first cooling water circulation device (circulation pump) is forcibly operated based on that temperature. Therefore, the intake port can be appropriately cooled.

  A first coolant circuit including an intake port coolant passage provided around an intake port in a cylinder head of the internal combustion engine; a cylinder block coolant passage provided in a cylinder block of the internal combustion engine; and an exhaust port periphery in the cylinder head A cooling path for cooling the periphery of the intake port, a cylinder block and a cylinder head, and a second cooling water circuit formed independently of the first cooling water circuit. Since the control means for controlling the operation of the first cooling water circulation device configured to circulate the cooling water in the first cooling water circuit is provided apart from the cooling path for cooling the exhaust port of the air, the air flowing through the intake port Can be efficiently cooled, and knocking of the engine having a high compression ratio can be prevented.

1 is a schematic overall configuration diagram showing a first embodiment of the present invention. It is a schematic whole block diagram which shows 2nd Embodiment of this invention. It is a perspective view showing the outline cooling water passage of a cylinder head. It is a flowchart of control of the electric pump concerning 1st Embodiment of this invention. FIG. 5 is a flowchart continued from FIG. 4. FIG. An explanatory view of prior art is shown.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specifically described. Only.

(First embodiment)
An outline of a cooling structure of an internal combustion engine (hereinafter referred to as an engine) will be described with reference to FIG. FIG. 1 is a schematic overall configuration diagram of an engine 1 in which a cylinder head 3 is mounted on a cylinder block 2.
The cylinder head 3 is provided with an intake port cooling water passage 7 through which cooling water for cooling the periphery of the intake port 32 of the cylinder head 3 circulates. The intake port cooling water passage 7 is disposed outside the engine 1. The first cooling water circuit 5 is connected to a radiator and a water pump (details will be described later) to circulate cooling water around the intake port 32.

  The cylinder block 2 is provided with a cylinder block cooling water passage 21 through which cooling water for cooling the periphery of the cylinder liner 23 of the cylinder block 2 is circulated. The cylinder head 3 is provided with cooling for cooling the periphery of the exhaust port 31. An exhaust port cooling water passage 8 through which water circulates is provided. These cylinder block cooling water passage 21 and exhaust port cooling water passage 8 are provided with a radiator and a water pump (details will be described later) disposed outside the engine 1. A second cooling water circuit 6 is formed to connect and circulate the cooling water around the cylinder block 2 and the exhaust port 31.

A cylindrical cylinder liner 23 is inserted into the cylinder block 2, and a piston 25 that slides in the vertical direction (in FIG. 1) is inserted along the axis of the cylinder liner 23.
A portion surrounded by the top 25a of the piston 25, the cylinder liner 23, and the cylinder head 3 forms a combustion chamber 28 in which air sucked from the intake port 32 and fuel (gasoline) are mixed and burned. .
The mixed gas of air and fuel is burned by a spark plug (not shown) provided in the cylinder head 3.
By the explosive combustion in the combustion chamber 28, the piston 25 is pushed downward and transmitted to the crankshaft (not shown) by the connecting rod 26, and the reciprocating motion is converted into the rotational motion by the crankshaft.
As the air and fuel are repeatedly burned in the combustion chamber 28, the cylinder liner 23 and the cylinder block 2 are heated, so that the piston 25 of the cylinder block 2 slides in order to cool it. A cylinder block cooling water passage 21 through which cooling water is passed in the circumferential direction of the cylinder liner 23 is formed.

  The cylinder head 3 is provided with an intake port 32 for introducing air into the combustion chamber 28, and an intake valve 34 that opens and closes the opening of the intake port 32 facing the combustion chamber 28 in conjunction with the sliding of the piston 25. And an exhaust port 31 for discharging exhaust gas combusted in the combustion chamber 28, and an exhaust valve 33 for opening and closing the opening of the exhaust port 31 facing the combustion chamber 28 in association with the sliding of the piston 25. Is provided. The intake port 32 is provided with an intake air temperature sensor 29 that detects the temperature of intake air passing through the intake port 32.

The cylinder head 3 forms the combustion chamber 28 and has an exhaust port 31 through which high-temperature exhaust gas is exhausted. Therefore, the cylinder head 3 is likely to become high temperature and needs to be cooled.
FIG. 3 shows a schematic cooling structure of the cylinder head 3. FIG. 3 shows a cooling water channel of an in-line three-cylinder engine. In order to make the cooling water channel easy to understand, the cooling water channel is shown by a solid line through the cylinder head 3.
As described above, the cooling structure of the cylinder head 3 includes the exhaust port cooling water passage 8 through which the cooling water for cooling the periphery of the exhaust port 31 circulates, and the intake port cooling water passage through which the cooling water for cooling the periphery of the intake port 32 circulates. 7 is disposed.

The exhaust port cooling water passage 8 is provided with a first cooling water introduction portion 84 connected to the cooling water outlet portion 22 for leading the cooling water that has cooled the cylinder block 2 to the cylinder head 3.
In the exhaust port cooling water passage 8, cooling water passages 81 and 82 formed in an annular shape on the outer peripheral portion of the exhaust port 31 (FIG. 1 is a cross-sectional view. However, the cooling water passage is actually communicated (hereinafter, the cooling water passage is indicated in the same manner), and a cooling water passage 83 is formed in the outer peripheral portion of the exhaust valve 33.
And it is derived | led-out outside from the 1st cooling water derivation | leading-out part 85 of the exhaust port cooling water channel | path 8. FIG.
Note that the cooling water passages 81, 82, 83 and the first cooling water lead-out portion 85 in the figure are connected by broken lines (see FIG. 1) that the cooling water passages communicate with each other. It is shown.

The intake port cooling water passage 7 introduces cooling water from the second cooling water introduction part 75. The introduced cooling water is guided to the cooling water passages 71 and 73 on the outer periphery of the intake valve 34 and the intake cooling water passage 72 in which a part of the cooling water passage is exposed in the intake port 32.
Then, the cooling water circulated through the intake port cooling water passage 7 is led out from the third cooling water lead-out portion 74 to the outside of the cylinder head.
In this embodiment, a part of the intake port cooling water passage 7 is constituted by the intake cooling water passage 72 formed so as to be exposed in the intake port 32, so that the intake air flowing through the intake port 32 is more effective. Can be cooled.
The intake cooling water passage 72 may not be provided when the intake air (air) passing through the intake port 32 can be cooled to a desired temperature by the cooling water passages 71 and 73.

  The first cooling water circuit 5 includes an intake port cooling water passage 7, a first radiator 51 that cools the cooling water, and the cooling water cooled by the first radiator 51 to the second cooling water introduction unit 75 of the cylinder head 3. Between the electric pump 52 for pressure-feeding to the intake port cooling water passage 7 via the first cooling water, the first cooling water temperature detecting means 57 for detecting the temperature of the cooling water derived from the third cooling water deriving section 74, and the respective devices. It consists of cooling water piping to be connected.

The cooling water cooled by the first radiator 51 is introduced from the second cooling water introduction part 75 into the intake port cooling water passage 7 via the first pipe 55 and the second pipe 56 by the electric pump 52. Then, the cooling water circulated in the intake port cooling water passage 7 is returned to the first radiator 51 through the third pipe 54 from the third cooling water outlet 74 of the intake port cooling water passage 7 and cooled.
The electric pump 52 includes first cooling water temperature detecting means 57, second cooling water temperature detecting means 58 located upstream of the thermostat 62 of the second cooling water circuit 6, the intake air temperature sensor 29, and the electric pump 52. Based on the detection result of the stop time detection means (not shown), the operation and stop are controlled by a signal from the control means 53. A detailed control method will be described later.

  The second cooling water circuit 6 includes the exhaust port cooling water passage 8, a second radiator 61 that cools the cooling water, and the cooling water cooled by the second radiator 61 is introduced into the third cooling water of the cylinder block 2. The first water pump (second cooling water circulation device) 63 that pumps the cylinder block cooling water passage 21 through the portion 27, and the second cooling water outlet 24 and the second radiator 61 of the cylinder block 2 are provided. When the cooling water temperature HB <threshold value Ho of the second cooling water circuit 6 that has circulated through the exhaust port cooling water passage 8, the thermostat 62 that bypasses the cooling water to the first water pump 63 side and the respective devices are connected. It consists of cooling water piping to be connected. The first water pump 63 is always driven from the crankshaft (not shown) of the engine 1 via a belt or the like while the engine is operating.

Here, the flow of the cooling water in the second cooling water circuit 6 that performs cooling of the cylinder block 2 and cooling around the exhaust port 31 will be described.
When the engine 1 is started, circulation of the cooling water in the second cooling water circuit 6 is started by driving the first water pump 63. When the cooling water temperature HB is lower than the threshold value H ₀ , the thermostat 62 is in a closed state, so that the cooling water is the cylinder block cooling water passage 21, the exhaust port cooling water passage 8, the sixth pipe 64, the thermostat 62, and the bypass pipe. 67, the circuit composed of the first water pump 63 and the fifth pipe 68 is circulated. That is, when the cooling water temperature HB is lower than the threshold value H ₀ , the cooling water is not cooled by the second radiator 61, so that warm-up of the engine 1 is promoted.
When the engine 1 is continuously operated and the cooling water temperature HB becomes equal to or higher than the threshold value H ₀ , the thermostat 62 is opened, and the cooling water is in the cylinder block cooling water passage 21, the exhaust port cooling water passage 8, the sixth pipe 64, and the thermostat. 62, a seventh pipe 65, a second radiator 61, a fourth pipe 66, a first water pump 63, a bypass pipe 67, and a fifth pipe 68 are circulated. As a result, the cooling water is cooled by the second radiator 61 and can be appropriately cooled so that the engine 1 does not overheat.

Next, control of the flow of the cooling water in the first cooling water circuit 5 will be described with reference to the flowchart of FIG. In the first cooling water circuit 5, the flow of the cooling water is controlled by controlling the operation of the electric pump 52 by the control means 53. The following control routine is executed from when the engine is driven until it stops.
First, when the engine 1 is started, the control means 53 starts counting the stop time TS of the electric pump 52 by a stop time detecting means (not shown) (step S1).
Then run detection processing of the cooling water temperature HB in the second coolant circuit according to a second coolant temperature detecting means 58 (step S2), and determines whether the cooling water temperature HB is lower than the threshold H ₁ (Step S3). If the cooling water temperature HB <threshold _{H 1,} the decision result in the step S3 is Yes, the process proceeds to step S4. When the determination result of step S3 is No, the process proceeds to step S10, and the operation process of the electric pump 52 is executed. The processing after step S10 will be described later.
Returning to step S4, the description will be continued. In step S4, it is determined whether or not stop time TS of the electric pump starts to count exceeds the threshold value T ₀ in step S1. If the stop time TS <threshold _{T 0,} the determination result of step S4 is Yes, the process proceeds to step S5. If the determination result of step S4 is No, the process proceeds to step S10.
In step S5, executes a process of detecting the intake air temperature M by the intake air temperature sensor 29, then, it determines whether or not the intake air temperature M is lower than the threshold M ₀ (step S6). If the intake air temperature M <threshold value _{M 0,} the judgment result in step S6 is Yes, the process proceeds to step S7. If the determination result of step S6 is No, the process proceeds to step S10.
In step S7, and performs the detection process of the cooling water temperature HA in the first coolant circuit according to the first cooling water temperature detecting means 57, then, it determines whether or not the cooling water temperature HA is lower than the threshold H ₂ (Step S8). If the cooling water temperature HA <threshold _{H 2,} the decision result in the step S8 returns to Yes, and step S2. If the determination result of step S8 is No, the process proceeds to step S10.
Next, the process after step S10 is demonstrated. As described above, when the determination result in any of Step S3, Step S4, Step S6, and Step S8 is No, the control unit 53 performs the operation control of the electric pump 52 (Step S10).
In response to the operation of the electric pump 52, the control means 53 resets the count of the stop time TS of the electric pump 52 by the stop time detecting means (not shown) (step S11). Then performs the detection process of the cooling water temperature HA in the first coolant circuit (step S12), the determining whether the cooling water temperature HA is lower than the threshold H ₂ (step S13). When the cooling water temperature HA by the operation of the electric pump 52 is lower than the threshold value H _2, the determination result is Yes in step S13, the control unit 53 stops the operation of the electric pump 52, the flow returns to step S1. If the determination result of step S13 is No, the flow returns to step S11, whether the engine 1 is stopped after the control unit 53 to the cooling water temperature HA is lower than the threshold H ₂ executes the operation processing of the electric pump 52.

Thus, in this embodiment, when the electric pump (first cooling water circulation device) 52 of the first cooling water circuit 5 is stopped, the first water pump 63 that operates simultaneously with the start of the engine 1 is relatively The operation of the electric pump 52 is controlled based on the cooling water temperature HB in the second cooling water circuit 6 where the temperature in the circuit is uniform. Therefore, the cooling around the intake port 32 is started more accurately than the control based on the temperature of the cooling water in the first cooling water circuit 5 where the temperature rise is uneven due to the electric pump 52 being stopped. And control that suppresses knocking while keeping the intake air temperature low is accurately performed.
The second even when the cooling water temperature HB coolant circuit 6 is the threshold value H ₁ less than the stop time TS is a predetermined time from start of the engine 1 of the electric pump 52 detected by the second coolant temperature detecting means 58 If you exceed T ₀ so that to operate the electric pump 52. Therefore, for example, even when a local temperature rise around the intake port 32 occurs due to a high load operation immediately after startup, cooling around the intake port 32 can be appropriately started.
Even when the cooling water temperature HB in the second cooling water circuit 6 and the stop time TS of the electric pump 52 are both less than or equal to the threshold value, the temperature M of the intake air flowing into the intake port 32 is higher than the threshold value M _0. The electric pump 52 is operated. Therefore, since the intake air temperature is directly detected and controlled based on the temperature, local temperature rise around the intake port 32 can be more reliably prevented, and appropriate cooling around the intake port 32 can be performed.
Further, the cooling water temperature HB and stop time TS intake air temperature M even when following any threshold, the electric pump 52 when the cooling water temperature HA detected by the first coolant temperature detecting means 57 is the threshold value H ₂ more Is activated. Therefore, for example, in a vehicle in which automatic stop and restart of the engine are repeatedly performed, such as a vehicle having an idling stop function, only the temperature around the intake port 32 seems to be sufficiently high immediately after the engine 1 is started. Even in such a case, cooling around the intake port 32 can be performed appropriately.
In addition, when the electric pump 52 is driven, the temperature of the cooling water in the first cooling water circuit 5 is uniform, so that the electric pump is operated based on the temperature HA detected by the first cooling water temperature detecting means 57. By controlling the operation, cooling around the intake port 32 can be appropriately performed.

As described above, in this embodiment, the cooling path (first cooling water circuit 5) for cooling the periphery of the intake port 32 is used as the cooling path (second cooling water circuit) for cooling the cylinder block 2 and the exhaust port 31 of the cylinder head. 6), and detected by the cooling water temperature HB in the second cooling water circuit 6, the stop time TS of the electric pump 52, the temperature M of the intake air flowing into the intake port 32, and the first cooling water temperature detection means 57. The electric pump 52 is operated on the basis of the cooling water temperature HA to control the flow of the cooling water flowing through the first cooling water circuit 5. Therefore, the intake air (air) passing through the intake port 32 can be efficiently cooled, knocking of the engine having a high compression ratio can be prevented, and the fuel consumption rate can be improved.
Each of the above threshold values may be obtained from a map set beforehand through experiments or the like, or may be changed as appropriate according to the driving situation.

(Second Embodiment)
FIG. 2 shows a schematic overall configuration diagram of the cooling structure according to the second embodiment of the present invention.
In the second embodiment, the structure on the engine main body side, the first cooling water circuit 5 and the second cooling water circuit 6 are the same as those in the first embodiment. .
The second embodiment is different from the first embodiment in that a second water pump 91 driven by a driving force of a crankshaft (not shown) of the engine 1 is provided instead of the electric pump 52 shown in the first embodiment. .

The second water pump 91 is connected to and disconnected from the engine crankshaft by an electromagnetic clutch 92. The electromagnetic clutch 92 is controlled to be connected and disconnected by a command signal from the control means 53. It has become so. The control content of the control means 53 is the same as that of the first embodiment, and the electromagnetic clutch 92 may be connected and disconnected by the operation and stop signals of the electric pump 52 in the first embodiment.
As described above, according to the second embodiment, as in the first embodiment, the intake air (air) passing through the intake port 32 can be efficiently cooled, and knocking of the engine with a high compression ratio can be prevented. It is possible to improve the fuel consumption rate.
Furthermore, in the second embodiment, only the output of the ON / OFF signal to the electromagnetic clutch 92 does not require electric power for operating the electric pump 52, so that power consumption can be saved.

  According to the present invention, the cooling path for cooling the vicinity of the intake port is separated from the cooling path for cooling the cylinder block and the exhaust port of the cylinder head, and the flow of cooling water flowing through the cooling path around the intake port is controlled. Therefore, the air flowing through the intake port can be efficiently cooled to prevent the occurrence of knocking, which is suitable for use in an engine cooling control device.

1 Engine 2 Cylinder block 3 Cylinder head 5 1st cooling water circuit 6 2nd cooling water circuit.
7 Intake port cooling water passage 8 Exhaust port cooling water passage 21 Cylinder block cooling water passage 23 Cylinder liner 25 Piston 26 Connecting rod 28 Combustion chamber 29 Intake temperature sensor 31 Exhaust port 32 Intake port 51 First radiator 52 Electric pump 52 (First cooling) Water circulation device)
53 Control means 57 First cooling water temperature detection means 58 Second cooling water temperature detection means 61 Second radiator 62 Thermostat 63 First water pump (second cooling water circulation device)
91 2nd water pump (1st cooling water circulation device)
92 Electromagnetic clutch

Claims (5)

A first coolant circuit including an intake port coolant passage provided around an intake port in a cylinder head of an internal combustion engine;
A cylinder block cooling water passage provided in a cylinder block of the internal combustion engine and an exhaust port cooling water passage provided around an exhaust port in the cylinder head, the second being formed independently of the first cooling water circuit; A cooling water circuit;
A first cooling water circulation device for circulating cooling water in the first cooling water circuit;
Second cooling water temperature detecting means for detecting the temperature of the cooling water in the second cooling water circuit;
Control means for controlling the operation of the first cooling water circulation device;
A cooling control device for an internal combustion engine comprising:
The control means controls the first cooling water circulation device based on the temperature detected by the second cooling water temperature detection means while the first cooling water circulation device is stopped. Cooling control device.   First cooling water temperature detection means for detecting the temperature of the cooling water in the first cooling water circuit is provided, and the control means is detected by the first cooling water temperature detection means during driving of the first cooling water circulation device. The cooling control device for an internal combustion engine according to claim 1, wherein the first cooling water circulation device is controlled based on the measured temperature.   When the temperature detected by the second cooling water temperature detecting unit is less than a predetermined value and a predetermined condition is satisfied while the first cooling water circulating device is stopped, the control unit turns the first cooling water circulating device on 3. The cooling control apparatus for an internal combustion engine according to claim 1, further comprising forcible operation means for forcibly operating the internal combustion engine.   A stop time measuring means for measuring a stop time of the first cooling water circulation device, wherein the forcible operating means satisfies the predetermined condition including that the stop time measured by the stop time measuring means exceeds a predetermined time; 4. The internal combustion engine cooling control apparatus according to claim 3, wherein the first cooling water circulation device is forcibly actuated in the event of a failure.   An intake air temperature detecting means for detecting a temperature of the intake air flowing into the intake port, and the forcible operating means has the predetermined condition including that the intake air temperature detected by the intake air temperature detecting means exceeds a predetermined value. 4. The internal combustion engine cooling control apparatus according to claim 3, wherein, when established, the first cooling water circulation device is forcibly operated.

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