JP5699839B2 - Engine cooling system - Google Patents

Description

  The present invention relates to an engine cooling device including a cooling water passage.

  2. Description of the Related Art Conventionally, an engine cooling device is known that includes a cooling water passage, a water pump that circulates cooling water in the cooling water passage, and a radiator that cools cooling water circulated in the cooling water passage (for example, a patent). Reference 1).

  Patent Document 1 discloses a first cooling water passage connected from a discharge port of a water pump to a direction control valve via a water jacket of a cylinder head, and direction control from a discharge port of the water pump via a water jacket of a cylinder block. A second cooling water passage connected to the valve, a radiator inlet-side passage connecting the direction control valve and the radiator inlet, a radiator outlet-side passage connecting the radiator outlet and the water pump inlet, A cooling device for an internal combustion engine having a bypass passage connecting a direction control valve and a radiator outlet side passage is disclosed.

  The internal combustion engine cooling device is provided with a throttle passage connected from the outlet side of the water jacket of the first cooling water passage to the inlet of the water pump through the throttle body.

  In this internal combustion engine cooling apparatus, the first cooling water passage and the second cooling water passage are closed by the direction control valve during warm-up. Thereby, since the cooling water can be retained in the water jacket of the cylinder block, it is possible to quickly warm up the cylinder block.

  At this time, since the first cooling water passage is also closed by the direction control valve, the cooling water flows in the order of the water pump, the first cooling water passage (the water jacket of the cylinder head), and the throttle passage (throttle body). Circulate. As a result, the cooling water heated by the cylinder head flows to the throttle body, so that even if the throttle valve is frozen at the cold start of the engine, the throttle valve can be quickly frozen. It is.

JP 2010-43555 A

  However, the conventional internal combustion engine cooling device disclosed in Patent Document 1 has a problem that cooling water always flows to the throttle body during warm-up.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an engine cooling apparatus capable of controlling the flow of cooling water to the throttle body.

An engine cooling device according to the present invention is provided for a first cooling water passage that passes through an engine, a second cooling water passage that bypasses the engine and passes through a heat recovery unit, and a first cooling water passage and a second cooling water passage. And a flow rate control unit for cooling water disposed between the third cooling water passage passing through the throttle body, the first cooling water passage, the second cooling water passage, and the third cooling water passage. And a determination unit for determining whether or not the throttle valve is frozen. The determination unit is configured to determine which one of the cooling water located in the first cooling water passage and the cooling water located in the second cooling water passage is hot. When the determination unit determines that the throttle valve is frozen, the flow rate control unit determines whether the cooling unit located in the first cooling water passage or the cooling water located in the second cooling water passage has a high temperature by the determination unit. The cooling water determined to be present is configured to flow through the third cooling water passage .

With this configuration, it is possible to control whether or not the cooling water is allowed to flow through the throttle body by the flow rate control unit. Thereby, for example, when the throttle valve is frozen , the freezing of the throttle valve can be quickly eliminated by flowing high-temperature cooling water to the throttle body, and the throttle valve is not frozen. Can prevent cooling water from flowing into the throttle body.

  In the engine cooling apparatus, the heat recovery unit may include an exhaust heat recovery unit.

  If comprised in this way, the cooling water made into high temperature with the exhaust heat recovery device can be poured into a throttle body.

  In the engine cooling device, the heat recovery unit may include an EGR cooler.

  If comprised in this way, the cooling water made into high temperature with an EGR cooler can be poured into a throttle body.

  In the engine cooling apparatus, the flow rate control unit may include a rotary valve.

  If comprised in this way, it can be controlled easily whether cooling water is made to flow through a throttle body.

  According to the engine cooling device of the present invention, the flow of cooling water to the throttle body can be controlled.

It is the figure which showed typically the structure of the engine cooling device by one Embodiment of this invention. It is the block diagram which showed the structure of ECU of the engine cooling device shown in FIG. It is a figure for demonstrating the operation | movement at the time of the cold of the engine cooling device shown in FIG. It is a figure for demonstrating the operation | movement at the time of complete warming of the engine cooling device shown in FIG. 2 is a flowchart for explaining an operation at the time of freezing of a throttle valve of the engine cooling device shown in FIG. 1. FIG. 2 is a diagram for explaining an operation when the cooling water that has passed through an exhaust heat recovery device is at the highest temperature when the throttle valve is frozen when the engine cooling device shown in FIG. 1 is cold. FIG. 2 is a diagram for explaining an operation when the coolant passing through an exhaust heat recovery device is at a highest temperature when the throttle valve is frozen when the engine cooling device shown in FIG. 1 is completely warmed up.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

−Configuration−
First, with reference to FIG. 1 and FIG. 2, the structure of the engine cooling device 100 by one Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the engine cooling device 100 includes a cooling water passage 1, a water pump 2 that circulates cooling water in the cooling water passage 1, and a radiator 3 that cools the cooling water circulated in the cooling water passage 1. And a rotary valve 4 and a thermostat 5 disposed on the path of the cooling water passage 1, and an ECU 6 (see FIG. 2) for controlling the rotary valve 4. The engine cooling device 100 is configured to cool the engine 150 with cooling water circulating in the cooling water passage 1.

  The engine 150 is a gasoline engine or a diesel engine mounted on a conventional vehicle, a hybrid vehicle, or the like, and includes a cylinder head 151 and a cylinder block 152. An in-head cooling water passage (head-side water jacket) 151 a for cooling the cylinder head 151 is formed inside the cylinder head 151, and inside the block for cooling the cylinder block 152, inside the cylinder block 152. A cooling water passage (block side water jacket) 152a is formed. In the engine 150 according to the present embodiment, the in-head cooling water passage 151a and the in-block cooling water passage 152a are independent of each other.

  The cooling water passage 1 includes passages 11 to 14 provided in parallel between the water pump 2 and the rotary valve 4, a passage 15 connecting the rotary valve 4 and the radiator 3, and bypassing the radiator 3. 4 and passages 16 and 17 connecting the water pump 2, a passage 18 connecting the radiator 3 and the thermostat 5, and a passage 19 connecting the thermostat 5 and the water pump 2.

  The passage 11 is formed so as to connect the water pump 2 and the rotary valve 4 via the cylinder head 151 of the engine 150. The passage 11 includes a passage portion 11a that connects the discharge port of the water pump 2 and the inlet of the in-head cooling water passage 151a, the in-head cooling water passage 151a, the outflow port of the in-head cooling water passage 151a, and the rotary valve. And a passage portion 11b connecting the four ports 41. Then, the cylinder head 151 of the engine 150 is cooled by the cooling water passing through the passage 11. The passage 11 is an example of the “first cooling water passage” in the present invention.

  The passage 12 is formed so as to connect the water pump 2 and the rotary valve 4 via the cylinder block 152 of the engine 150. The passage 12 includes a passage portion 12a connecting the discharge port of the water pump 2 and the inlet of the in-block cooling water passage 152a, the in-block cooling water passage 152a, the outlet of the in-block cooling water passage 152a, and the rotary valve. 4 passages 12b connecting the four ports 42. Then, the cylinder block 152 of the engine 150 is cooled by the cooling water passing through the passage 12. The passage 12 is an example of the “first cooling water passage” in the present invention.

  The passage 13 is formed so as to connect the water pump 2 and the rotary valve 4 via the exhaust heat recovery device 7. The passage 13 is a bypass passage formed so as to bypass the engine 150. The passage 13 includes a passage portion 13a connecting the discharge port of the water pump 2 and the exhaust heat recovery device 7, a passage portion 7a of the cooling water in the exhaust heat recovery device 7, the exhaust heat recovery device 7, and the rotary valve 4. It is comprised by the channel | path part 13b which connects with the port 43 of this. The exhaust heat recovery unit 7 is provided to improve the warm-up performance of the heater (not shown) and the engine 150 by recovering the heat of the exhaust gas of the engine 150 and heating the cooling water. The passage 13 is an example of the “second cooling water passage” in the present invention, and the exhaust heat recovery device 7 is an example of the “heat recovery section” in the present invention.

  The passage 14 is formed so as to connect the water pump 2 and the rotary valve 4 through an EGR (Exhaust Gas Recirculation) cooler 8. The passage 14 is a bypass passage formed so as to bypass the engine 150. The passage 14 connects a passage portion 14 a that connects the discharge port of the water pump 2 and the EGR cooler 8, a passage portion 8 a for cooling water in the EGR cooler 8, and a port 44 of the EGR cooler 8 and the rotary valve 4. And a passage portion 14b. The EGR cooler 8 is provided to cool the EGR gas by exchanging heat between the EGR gas recirculated from the exhaust system of the engine 150 to the intake system and the cooling water. The passage 14 is an example of the “second cooling water passage” in the present invention, and the EGR cooler 8 is an example of the “heat recovery section” in the present invention.

  The passage 15 connects the port 46 of the rotary valve 4 and the radiator 3. The passage 16 is a bypass passage that connects the port 46 of the rotary valve 4 and the suction port of the water pump 2 and bypasses the radiator 3.

  The passage 17 is formed so as to connect the rotary valve 4 and the water pump 2 via the throttle body 9. The passage 17 is a bypass passage formed so as to bypass the radiator 3 and pass through the throttle body 9.

  Inside the throttle body 9, a throttle valve 9b (see FIG. 2) for controlling the amount of air-fuel mixture sucked into the engine 150 is arranged. The throttle body 9 is provided with a cooling water passage 9a. The passage portion 9a is provided to warm the throttle body 9 with cooling water in order to prevent the throttle valve 9b from freezing.

  The passage 17 includes a passage portion 17a that connects the port 45 of the rotary valve 4 and the throttle body 9, a passage portion 9a of the throttle body 9, and a passage portion 17b that connects the throttle body 9 and the suction port of the water pump 2. It is comprised by. The passage 17 is an example of the “third cooling water passage” in the present invention.

  The water pump 2 is, for example, a mechanical water pump, is connected to a crankshaft that is an output shaft of the engine 150, and is driven by a rotational driving force of the crankshaft. The water pump 2 is configured to discharge the sucked cooling water from the discharge port to the passages 11 to 14. That is, the passages 11 to 14 are arranged on the upstream side with respect to the passages 15 to 17.

  The radiator 3 is configured to cool the cooling water flowing from the passage 15 and discharge it to the passage 18. The radiator 3 is configured to release heat of the cooling water to the outside air by exchanging heat between the cooling water from which the heat has been recovered and the outside air.

  The rotary valve 4 includes a valve body having ports 41 to 46, a valve body rotatably accommodated in the valve body, and a motor 47 (see FIG. 2) that rotationally drives the valve body. The rotary valve 4 has a function of switching connection of the ports 41 to 46 and controlling the flow rate of the cooling water of the ports 41 to 46. The rotary valve 4 is configured such that the ports 41 to 44 are cooling water inflow ports and the ports 45 and 46 are cooling water discharge ports so that the inflow port and the discharge port can be connected to each other. The rotary valve 4 is disposed between the passages 11 to 14 and the passages 15 to 17. The rotary valve 4 is an example of the “flow rate control unit” in the present invention.

  The thermostat 5 is a valve device that is operated by, for example, expansion / contraction of a thermo wax (temperature sensing unit). The thermostat 5 is configured to shut off between the radiator 3 and the water pump 2 by closing when the temperature of the cooling water is low (for example, below about 80 ° C.). Further, the thermostat 5 is configured to communicate between the radiator 3 and the water pump 2 by opening the valve when the temperature of the cooling water is high (for example, about 80 ° C. or more).

  Therefore, when the temperature of the cooling water is low, the cooling water bypasses the radiator 3 and flows through the passage 16 so that the cooling water is not cooled by the radiator 3. On the other hand, when the temperature of the cooling water is high, a part of the cooling water flows through the radiator 3 to cool the cooling water.

  Further, as shown in FIG. 2, the ECU 6 includes a CPU 61, a ROM 62, a RAM 63, a backup RAM 64, an input interface 65, an output interface 66, and a bus 67 for connecting them. The ECU 6 is an example of the “determination unit” in the present invention.

  The CPU 61 has a function of executing arithmetic processing based on various control programs and maps stored in the ROM 62. The ROM 62 stores various control programs and maps that are referred to when the various control programs are executed. Specifically, the ROM 62 stores a temperature estimation map 62a.

  The temperature estimation map 62a is a map for estimating the temperature of cooling water flowing into the ports 41 to 44 from the passages 11 to 14, respectively, using detection results of a water temperature sensor 67c and an outside air temperature sensor 67d described later as parameters. is there. The cooling water flowing into the ports 41 and 42 is an example of the “cooling water located in the first cooling water passage” of the present invention, and the cooling water flowing into the ports 43 and 44 is the “second cooling water” of the present invention. It is an example of a “cooling water located in the cooling water passage”.

  The RAM 63 is a memory that temporarily stores calculation results by the CPU 61 and detection results of the sensors. The backup RAM 64 is a non-volatile memory that stores data to be saved when the engine 150 is stopped.

  An accelerator opening sensor 67a, a throttle opening sensor 67b, a water temperature sensor 67c, and an outside air temperature sensor 67d are connected to the input interface 65, and the detection results of each sensor are input.

  The accelerator opening sensor 67a is a sensor that detects the operation amount (depressing amount) of the accelerator pedal, and the throttle opening sensor 67b is a sensor that detects the opening of the throttle valve 9b. The water temperature sensor 67c is a sensor that detects the temperature of the cooling water, and is disposed in the vicinity of the outlet of the in-head cooling water passage 151a (see FIG. 1). The outside air temperature sensor 67d is, for example, a sensor that detects the air temperature outside the engine room, and is disposed in the vicinity of the bumper.

  A motor 47 of the rotary valve 4 is connected to the output interface 66. The ECU 6 controls the opening and closing (connection) of the ports 41 to 46 (see FIG. 1) of the rotary valve 4 by controlling the motor 47 based on the detection result of each sensor input via the input interface 65. Is configured to do.

-Operation-
Next, the operation of the engine cooling apparatus 100 according to the embodiment of the present invention will be described with reference to FIGS. In the following, the operation during cold (when warming up) and when completely warming up (after completion of warming up) when the ECU 6 determines that the throttle valve 9b is not frozen will be described.

[When cold]
First, as shown in FIG. 3, after the start of the engine 150, the thermostat 5 is closed because the temperature of the cooling water is low (for example, less than about 80 degrees). Further, when the motor 47 (see FIG. 2) is controlled by the ECU 6, the ports 42 and 45 of the rotary valve 4 are closed, and the ports 41, 43 and 44 are connected to the port 46.

  Then, when the water pump 2 is driven, the cooling water discharged from the water pump 2 is changed into a passage 11 (in-head cooling water passage 151a), a passage 13 (passage portion 7a of the exhaust heat recovery device 7), or While flowing into the rotary valve 4 via the passage 14 (passage portion 8a of the EGR cooler 8), the cooling water flowing into the rotary valve 4 is returned to the water pump 2 via the passage 16.

  As a result, the cooling water in the cylinder block 152 is stopped, so that the temperature of the cylinder block 152 can be quickly increased, so that the friction loss of the cylinder is reduced and the fuel consumption (fuel consumption rate) is improved. It is possible to plan.

[When fully warmed up]
As shown in FIG. 4, when the temperature of the cooling water becomes high (for example, about 80 ° C. or higher) and the engine 150 is completely warmed up, the thermostat 5 is opened. At this time, the motor 47 is controlled by the ECU 6 so that the port 42 is connected to the port 46.

  When the water pump 2 is driven, the cooling water discharged from the water pump 2 is supplied to the passage 11 (in-head cooling water passage 151a), the passage 12 (in-block cooling water passage 152a), and the passage 13 (exhaust gas). While flowing into the rotary valve 4 via the passage portion 7a) of the heat recovery device 7 or the passage 14 (passage portion 8a of the EGR cooler 8), the cooling water flowing into the rotary valve 4 passes through the passage 16 or the radiator 3. Through the water pump 2.

  For this reason, a part of the cooling water flows through the radiator 3, and the heat of the cooling water is released to the outside air.

  Next, with reference to FIG. 1, FIG. 2 and FIGS. 5 to 7, the operation at the time of freezing of the throttle valve 9b of the engine cooling device 100 according to the embodiment of the present invention will be described. The following operation is started after the start of engine 150 and is repeated until engine 150 is stopped.

  First, in step S1 of FIG. 5, the ECU 6 (see FIG. 2) determines whether or not the outside air temperature is equal to or lower than a predetermined temperature (for example, 5 ° C.). Specifically, the ECU 6 determines whether or not the detection result of the outside air temperature sensor 67d (see FIG. 2) is equal to or lower than a predetermined temperature. When it is determined that the outside air temperature is not lower than the predetermined temperature, step S1 is repeatedly performed. That is, the ECU 6 stands by until the outside air temperature becomes a predetermined temperature or less. When it is determined that the outside air temperature is equal to or lower than the predetermined temperature, the process proceeds to step S2.

  Next, in step S2, the ECU 6 determines whether or not the throttle valve 9b (see FIG. 2) operates normally. Whether or not the throttle valve 9b operates normally is determined based on the detection result of the throttle opening sensor (see FIG. 2) corresponding to the detection result of the accelerator opening sensor (see FIG. 2). It is judged based on whether or not. When it is determined that the throttle valve 9b operates normally, the process returns to step S1. On the other hand, if it is determined that the throttle valve 9b does not operate normally, the process proceeds to step S3.

  Note that the throttle valve 9b does not operate normally when, for example, the throttle valve 9b does not close even when the accelerator pedal is returned, or the throttle valve 9b does not open even when the accelerator pedal is depressed. Such as the case.

  Next, in step S3, the ECU 6 determines that the throttle valve 9b is frozen. In step S4, the ECU 6 uses the detection results of the water temperature sensor 67c (see FIG. 2), the detection results of the outside air temperature sensor 67d, and the temperature estimation map 62a (see FIG. 2), respectively, from the passages 11-14. The temperature of the cooling water flowing into each port 41 to 44 (see FIG. 1) is estimated. Then, the ECU 6 determines the port through which the hottest cooling water flows based on the estimation result.

  Next, in step S5, the ECU 6 controls the motor 47 (see FIG. 2) of the rotary valve 4. Specifically, the port determined to receive the hottest cooling water in step S4 is connected to the port 45 (see FIG. 1). As a result, high-temperature cooling water can be intensively flowed through the throttle body 9 (see FIG. 1), so that freezing of the throttle valve 9b can be quickly eliminated.

  For example, as shown in FIG. 6, when it is determined that the cooling water passing through the exhaust heat recovery device 7 and flowing into the port 43 is the hottest when it is cold, the motor 47 is controlled by the ECU 6. As a result, the port 43 connected to the port 46 is connected to the port 45. Since the ports 41 and 44 remain connected to the port 46, the cooling water flowing into the ports 41 and 44 is discharged from the port 46.

  Thereby, the cooling water flowing into the rotary valve 4 through the passage 13 (the passage portion 7a of the exhaust heat recovery device 7) is discharged from the port 45. Accordingly, the high-temperature cooling water passes through the throttle body 9 and is returned to the water pump 2.

  For example, as shown in FIG. 7, when it is determined that the cooling water passing through the exhaust heat recovery device 7 and flowing into the port 43 is the hottest during complete warm-up, the ECU 6 causes the motor 47 to By being controlled, the port 43 connected to the port 46 is connected to the port 45. Since the ports 41, 42 and 44 remain connected to the port 46, the cooling water flowing into the ports 41, 42 and 44 is discharged from the port 46.

  Thereby, the cooling water flowing into the rotary valve 4 through the passage 13 (the passage portion 7a of the exhaust heat recovery device 7) is discharged from the port 45. Accordingly, the high-temperature cooling water passes through the throttle body 9 and is returned to the water pump 2.

-Effect-
In the present embodiment, as described above, the passage 11 that passes through the cylinder head 151, the passage 12 that passes through the cylinder block 152, the passage 13 that passes through the exhaust heat recovery device 7, and the passage 14 that passes through the EGR cooler 8, By providing the rotary valve 4 between the passage 17 passing through the throttle body 9, it is possible to control whether or not the cooling water flows through the throttle body 9.

  Further, in the present embodiment, when the ECU 6 determines that the throttle valve 9b is frozen, it is possible to eliminate the freezing of the throttle valve 9b by causing the rotary valve 4 to flow cooling water through the throttle body 9.

  In the present embodiment, when the ECU 6 determines that the throttle valve 9b is frozen, the throttle body 9 is determined by determining the port through which the hottest coolant flows and connecting the port to the port 45. Since the high-temperature cooling water can be intensively flown through, the freezing of the throttle valve 9b can be quickly eliminated.

  Further, in the present embodiment, when the ECU 6 determines that the throttle valve 9b is not frozen, the air-fuel mixture sucked into the engine 150 is not generated by not flowing the coolant through the throttle body 9 by the rotary valve 4. It is possible to suppress the need for warming.

  In this embodiment, by providing the rotary valve 4, any of the passages 11 to 14 can be easily connected to the passage 17.

  In the present embodiment, the temperature of the cooling water flowing into each of the ports 41 to 44 is estimated based on the detection result of the water temperature sensor 67c, the detection result of the outside air temperature sensor 67d, and the temperature estimation map 62a. The temperature of the cooling water flowing into each of the ports 41 to 44 can be estimated while suppressing an increase in the number of parts as compared with the case where the water temperature sensors are provided in the passages 12 to 14 respectively.

  In the present embodiment, whether or not the throttle valve 9b is frozen by determining that the throttle valve 9b is frozen when the outside air temperature is equal to or lower than the predetermined temperature and the throttle valve 9b does not operate normally. The accuracy of such determination can be improved.

-Other embodiments-
In addition, embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, the technical scope of the present invention includes all modifications within the meaning and scope equivalent to the scope of the claims.

  For example, in the present embodiment, the rotary valve 4 is shown as an example of the flow rate control unit of the present invention. However, the present invention is not limited to this, and the flow rate control unit of the present invention may be configured by a plurality of electromagnetic valves.

  Moreover, in this embodiment, the example which estimates the temperature of the cooling water which flows into each port 41-44 based on the detection result of the water temperature sensor 67c, the detection result of the external temperature sensor 67d, and the temperature estimation map 62a was shown. However, the present invention is not limited to this, and a water temperature sensor is provided in each of the passages 12 to 14, and the detection result of the water temperature sensor provided in each of the passages 11 to 14 is regarded as the temperature of the cooling water flowing into each of the ports 41 to 44. May be.

  In this embodiment, when the outside air temperature is equal to or lower than the predetermined temperature (step S1: Yes) and the throttle valve 9b does not operate normally (step S2: No), it is determined that the throttle valve 9b is frozen. However, the present invention is not limited to this, and it may be determined that the throttle valve is frozen when the outside air temperature is equal to or lower than a predetermined temperature or when the throttle valve does not operate normally. By configuring in this way, when there is a possibility that the throttle valve is frozen, it can be made fail-safe by setting so as to determine that the throttle valve is frozen. Note that it may be determined whether or not the throttle valve is frozen based on only one of the conditions when the outside air temperature is equal to or lower than a predetermined temperature and when the throttle valve does not operate normally. .

  In the present embodiment, the exhaust heat recovery unit 7 and the EGR cooler 8 are provided. However, the present invention is not limited to this, and only one of the exhaust heat recovery unit 7 and the EGR cooler 8 is provided. Good. That is, in the present embodiment, an example in which a plurality of heat recovery units of the present invention are provided is shown, but the present invention is not limited to this, and only one heat recovery unit of the present invention may be provided.

  In the present embodiment, an example is shown in which the port at which the hottest coolant is determined to flow in is connected to the port 45 so that the hot coolant passes through the throttle body 9. The plurality of ports that are determined to flow in the high-temperature cooling water may be connected to the port 45 so that the high-temperature cooling water passes through the throttle body 9.

  In the present embodiment, the example in which the head cooling water passage 151a and the block cooling water passage 152a are independent from each other has been shown. However, the present invention is not limited thereto, and the head cooling water passage, the block cooling water passage, May communicate with each other. That is, the cooling water that has flowed into the inlet of the water jacket of the cylinder block may flow to the water jacket of the cylinder head, and the cooling water may flow out of the outlet of the water jacket of the cylinder head.

  Further, in the present embodiment, the temperature of the cooling water flowing into each of the ports 41 to 44 is estimated, and an example in which the port determined to flow in the hottest cooling water is connected to the port 45 is shown. Not limited to this, when it is cold, a port determined to flow in the hottest cooling water among the ports 41, 43 and 44 may be connected to the port 45. If comprised in this way, since the cooling water in the cylinder block 152 can be stopped at the time of cold, it can prevent that the warming-up of the cylinder block 152 is prevented. Normally, the cooling water in the cylinder head 151 is hotter than the cooling water in the cylinder block 152. Therefore, the port that is determined to have the highest temperature among the ports 41 to 44 flows into the port 45. Even if they are connected, it is unlikely that the port 42 is connected to the port 45 and the cylinder block 152 is prevented from warming up.

  Further, in the present embodiment, the temperature of the cooling water flowing into each of the ports 41 to 44 is estimated, and an example in which the port determined to flow in the hottest cooling water is connected to the port 45 is shown. Not limited to this, a preset port may be connected to the port 45 without estimating the temperature.

  In the present embodiment, the cooling water that has passed through the exhaust heat recovery device 7 is determined to be the hottest, and the cooling water is supplied to the throttle body 9. However, the present invention is not limited to this. When it is determined that the cooling water that has passed through 151 is the highest temperature, the cooling water is supplied to the throttle body 9, and when it is determined that the cooling water that has passed through the EGR cooler 8 is the highest temperature. The cooling water is supplied to the throttle body 9.

  Moreover, although the water pump 2 showed the example which is a mechanical type in this embodiment, it is not restricted to this, The water pump 2 may be an electric type.

4 Rotary valve (Flow control unit)
6 ECU (determination unit)
7 Exhaust heat recovery unit (heat recovery part)
8 EGR cooler (heat recovery part)
9 Throttle body 11 Passage (first coolant passage)
12 passage (first cooling water passage)
13 passage (second cooling water passage)
14 passage (second cooling water passage)
17 passage (third cooling water passage)
100 engine cooling device 150 engine

Claims (4)

A first coolant passage that passes through the engine;
A second cooling water passage that bypasses the engine and passes through the heat recovery section;
A third cooling water passage disposed downstream of the first cooling water passage and the second cooling water passage and passing through the throttle body;
A flow control unit of the cooling water is provided between the the first cooling water passage and the second cooling water passage, the third cooling water passage,
A determination unit for determining whether or not the throttle valve is frozen,
The determination unit is configured to determine which one of the cooling water located in the first cooling water passage and the cooling water located in the second cooling water passage is hot.
The flow rate control unit, when the determination unit determines that the throttle valve is frozen, out of the cooling water located in the first cooling water passage and the cooling water located in the second cooling water passage, An engine cooling apparatus configured to flow cooling water determined to be high temperature by the determination unit to the third cooling water passage . The engine cooling device according to claim 1 ,
The engine cooling device, wherein the heat recovery unit includes an exhaust heat recovery device. The engine cooling device according to claim 1 or 2 ,
The engine cooling device, wherein the heat recovery unit includes an EGR cooler. The engine cooling device according to any one of claims 1 to 3 , wherein
The engine cooling device, wherein the flow rate control unit includes a rotary valve.

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