JP2017141776A - Abnormality detection device for intercooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect an abnormality of an intercooler regardless of an operating state of an engine.SOLUTION: An abnormality detection device includes: a supercharger 7 for supercharging intake air in an intake passage 1 of an engine 10; an intercooler 6 provided downstream of the supercharger 7 in the intake passage 1; a cooling circuit 25 for supplying a refrigerant to the intercooler 6; a pump 23 disposed in the cooling circuit 25; a first pressure sensor 31 and a second pressure sensor 32 disposed on the upstream side and downstream side of the intercooler 6 in the intake passage 1, respectively; a refrigerant sensor 34 disposed in the cooling circuit 25 to detect information on a flow of the refrigerant; and refrigerant leakage detection means 41 for determining which detection information is used among a first pressure value P1 detected by the first pressure sensor 31, a second pressure value P2 detected by the second pressure sensor 32 or the information F on the refrigerant flow detected by the refrigerant sensor 34 on the basis of an operating state of the pump 23 and detecting presence/absence of leakage of the refrigerant in the cooling circuit 25 on the basis of the determined detection information.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an abnormality detection device for a liquid-cooled intercooler that cools intake air in an intake passage by supplying a refrigerant made of a liquid such as cooling water into a core that functions as a heat exchanger.

  Engines with superchargers that increase the intake pressure and increase the output by turbochargers such as turbochargers and superchargers are widely used. In an engine with a supercharger, an intercooler is provided on the downstream side of the supercharger in an intake passage to suppress an increase in intake air temperature due to an increase in intake pressure. By suppressing the rise in the intake air temperature, it is possible to improve the response of a gasoline engine, particularly a direct injection supercharged engine.

  In addition to the so-called air-cooled type, the intercooler is a liquid-cooled type that cools the intake air in the intake passage by supplying a refrigerant composed of a liquid such as cooling water into the core that functions as a heat exchanger. There are types.

  In a liquid-cooled intercooler, corrosion or the like may occur in the cooling circuit through which the refrigerant passes over time, and the cooling circuit may be damaged and refrigerant leakage may occur. In particular, if the corrosion of the cooling circuit occurs on the side of the cooling circuit facing the intake passage, it becomes a factor that delays the discovery of damage to the members of the cooling circuit and the accompanying refrigerant leakage.

  When such refrigerant leakage occurs, it is difficult to properly cool the intake air, and depending on the situation, there may be a situation where the refrigerant is mixed into the intake air. For this reason, various techniques for detecting leakage of the refrigerant have been proposed (see, for example, Patent Documents 1 to 3).

JP 2014-118906 A JP 2013-160067 A Japanese Patent Laying-Open No. 2015-14204

  In Patent Document 1, the presence or absence of leakage of cooling water is determined by detecting the amount of pressure rise when air flows into the cooling circuit through which the cooling water that is the refrigerant of the intercooler passes. However, when the pressure in the intake passage becomes negative, the refrigerant flows out to the intake passage without increasing the internal pressure of the cooling circuit, so this technique may not find any abnormality.

  In Patent Document 2, the occurrence of cooling water leakage is detected when the pressure of the cooling water is equal to or lower than the pressure that can be taken at normal times when no leakage of cooling water occurs. However, when the intake air is in a supercharged state, the intake air enters the cooling circuit, so that there may be a case where an abnormality cannot be found only by looking at the pressure drop.

  In the above-mentioned Patent Document 3, when the flow rate of the cooling water is equal to or higher than the minimum flow rate, if the differential pressure between the inlet / outlet pressures of the core of the intercooler is included in the predetermined pressure loss range, the abnormality of the intercooler is detected. Yes. However, in the water-cooled intercooler, even if a part of the cooling circuit is broken, the cooling water is present near the breakage, and air does not easily leak outside like the air-cooled intercooler. For this reason, it may be difficult to detect an abnormality simply by the conditions of the flow rate and the differential pressure.

  Therefore, an object of the present invention is to accurately detect an abnormality in the intercooler regardless of the operating state of the engine.

  In order to solve the above-described problems, the present invention provides a supercharger that supercharges intake air in an intake passage of an engine, an intercooler provided on the downstream side of the supercharger in the intake passage, and the intercooler. A cooling circuit for supplying refrigerant to the cooling circuit, a pump disposed in the cooling circuit, a first pressure sensor disposed on the upstream side of the intercooler in the intake passage, and a downstream side of the intercooler in the intake passage. A second pressure sensor arranged, a refrigerant sensor arranged in the cooling circuit for detecting information about the flow of the refrigerant, and an intake pressure value detected by the first pressure sensor based on an operating state of the pump. Any detection information from the first pressure value, the second pressure value that is the pressure value of the intake air detected by the second pressure sensor, or the information about the refrigerant flow detected by the refrigerant sensor Determine used, adopting the abnormality detection device of an intercooler and a refrigerant leak detection means for detecting the presence or absence of leakage of refrigerant in the cooling circuit based on the determined detection information.

  Here, the refrigerant leak detection means may employ a configuration for detecting the presence or absence of refrigerant leakage based on information on the refrigerant flow when the pump is not operating.

  In addition, a third pressure sensor disposed in the cooling circuit is provided, and the refrigerant leak detection unit is configured to operate when the first pressure value is equal to or higher than a predetermined supercharging pressure value when the pump is operating. The presence or absence of refrigerant leakage is detected based on the differential pressure between the second pressure value and the first pressure value, and the third pressure sensor detects when the first pressure value is less than a predetermined supercharging pressure value. A configuration that detects the presence or absence of refrigerant leakage based on the third pressure value can be employed.

  In each of these aspects, the cooling circuit is configured in an annular shape with a feed-side passage from which a refrigerant is directed from the intercooler radiator to the intercooler and a return-side passage from the intercooler to the intercooler radiator. May be disposed in the feed-side passage, and the refrigerant sensor may be disposed in the return-side passage.

  At this time, it is possible to employ a configuration in which an opening / closing valve is provided in the feed-side passage and the opening / closing valve is closed when the pump is not operating.

  Further, it is possible to employ a configuration in which an opening / closing valve is provided in the feed side passage and the opening / closing valve is controlled based on a pressure state in the intake passage when the pump is operating.

  In each of these aspects, when leakage of the refrigerant is detected, an alarm is issued to notify the abnormality of the intercooler, the supercharging pressure is reduced by the supercharger, or the refrigerant is discharged to the outside of the cooling circuit. It is possible to employ a configuration including an abnormality response control means for performing any control of discharge.

  In the present invention, since the method for detecting the abnormality of the intercooler is selected based on the operating state of the refrigerant pump, the supercharging state of the intake air, etc., the abnormality of the intercooler is accurately determined regardless of the operating state of the engine. Can be detected.

1 is an overall view of an engine and intercooler abnormality detection device according to an embodiment of the present invention. It is a flowchart which shows the example of control of this invention.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view showing the configuration of an intercooler abnormality detection device of the present invention and an engine 10 equipped with the abnormality detection device. In the figure, the members related to the present invention are mainly shown, and the others are not shown.

  The engine 10 is an automobile engine. As shown in FIG. 1, an intake passage 1 leading to an intake port for sending intake air into a cylinder containing a piston 5, an exhaust passage 2 drawn from the exhaust port, and other necessary fuels A fuel injection device for injecting fuel. The intake port and the exhaust port are opened and closed by an intake valve 3 and an exhaust valve 4, respectively, to the combustion chamber.

  In the intake passage 1, a throttle valve 13 that adjusts the flow area from the intake port toward the upstream side, an intercooler 6 that cools the intake air flowing through the intake passage 1, and a turbocharger compressor disposed as a supercharger 7. Further, an air cleaner 9 or the like is provided on the upstream side thereof.

  The exhaust passage 2 includes a turbocharger turbine, an exhaust purification unit 8 equipped with a catalyst for removing nitrogen oxide (NOx) and the like in the exhaust, and an exhaust pipe (muffler) from the exhaust port toward the downstream side. Provided.

  The supercharger 7 includes a compressor that applies supercharging pressure to the intake air in the intake passage 1 of the engine, and a turbine that is provided in the exhaust passage 2 of the engine. The turbine is rotated by the exhaust gas discharged through the exhaust passage 2, and the rotation of the turbine is transmitted to the compressor. The intake air taken in from the air cleaner 9 is compressed by the rotation of the compressor, and the supercharged intake air is supplied to the combustion chamber of the engine 10 through the intake passage 1 in a supercharged state.

  The exhaust passage 2 is provided with an exhaust bypass passage 11 that connects the upstream side and the downstream side of the turbine of the supercharger 7. The exhaust bypass passage 11 is provided with a waste gate valve 12 that opens and closes the flow path. When rotating the turbine, the wastegate valve 12 is closed. If the waste gate valve 12 is opened, most of the exhaust gas passes through the exhaust bypass passage 11 without passing through the turbine, so that the rotation of the turbine is suppressed. Thereby, supercharging of intake air is also suppressed.

  Further, although the intake air temperature tends to rise due to the supercharging of the intake air, the intercooler 6 is provided in the middle of the intake passage 1 to suppress the rise in the intake air temperature accompanying the increase in the intake pressure.

  An intake air temperature sensor provided in the intake passage 1 acquires the temperature of the intake air flowing out from the intercooler 6. An exhaust pressure sensor provided in the exhaust passage 2 acquires the exhaust pressure, and a rotational speed sensor provided adjacent to the crankshaft acquires the rotational speed of the engine 10. An intake air temperature sensor, exhaust pressure sensor, rotation speed sensor, etc. are not shown.

  Information obtained from each of these devices is sent to an electronic control unit 40 provided in a vehicle on which the engine 10 is mounted, and the temperature control of the intercooler 6 performed by the control means 43 provided in the electronic control unit 40, It is used to control the engine 10 in general and other equipment.

  The intercooler 6 includes a cooling circuit 25 through which a refrigerant (cooling medium) made of a liquid passes inside a core that covers the intake passage 1. Here, the same coolant as the coolant that cools the cylinder of the engine 10 is used as the coolant.

  The cooling circuit 25 includes a feed-side passage 21 from the intercooler radiator 20 to the intercooler 6 where the refrigerant is provided at the front of the vehicle, and a return-side passage 22 from the intercooler 6 to the intercooler radiator 20. It is configured in an annular shape. The intercooler radiator 20 is an air-cooling type cooling device, and has a function of cooling the refrigerant passing through the inside.

  The pump 23 that sends out the refrigerant is disposed in the feed-side passage 21. That is, the pump 23 is provided on the downstream side of the intercooler radiator 20. An opening / closing valve 24 is disposed in the feed side passage 21. The on-off valve 24 is an electromagnetic valve and is arranged on the downstream side of the pump 23. The pump 23 operates when the intake air in the intake passage 1 is supercharged by the supercharger 7 and does not operate unless the intake air is supercharged.

  The intercooler radiator 20 is provided with a discharge passage 26 for discharging the refrigerant out of the cooling circuit 25. By opening the drain valve 26a that is normally closed, the refrigerant is guided to the reservoir tank 27 through the discharge passage 26. If the liquid level of the refrigerant is lowered, the refrigerant is not supplied to the intercooler 6. .

  In addition, the intake passage 1 and the cooling circuit 25 have various sensors for detecting whether or not the cooling circuit 25 is damaged (corrosion holes or the like) due to corrosion of the member, that is, whether or not refrigerant leaks from the damaged portion. Kinds are provided.

  First, a first pressure sensor 31 is arranged on the upstream side of the intercooler 6 in the intake passage 1 and on the downstream side of the supercharger 7 as an intake passage upstream pressure sensor for detecting the pressure in the intake passage 1. Has been. A second pressure sensor 32 is disposed downstream of the intercooler 6 in the intake passage 1 and upstream of the throttle valve 13 as an intake passage downstream pressure sensor that detects the pressure in the intake passage 1. .

  The cooling circuit 25 is provided with a refrigerant sensor 34 that detects information F relating to the refrigerant flow. In this embodiment, a flow meter that detects the amount of fluid flowing is used as the refrigerant sensor 34. The refrigerant sensor 34 is disposed in the return side passage 22. As the refrigerant sensor 34, in addition to the flow meter, a flowmeter that detects the fluid flow speed, a sensor that detects the presence or absence of the fluid flow, and the like can be used.

  Furthermore, a third pressure sensor 33 is arranged in the cooling circuit 25 as a pressure sensor in the cooling circuit that detects the pressure in the cooling circuit 25. The third pressure sensor 33 is disposed in the return side passage 22.

  The electronic control unit 40, based on the operating status of the pump 23, the first pressure value P <b> 1 that is the pressure value of the intake air detected by the first pressure sensor 31, and the first pressure value that is the pressure value of the intake air detected by the second pressure sensor 32. It is determined which detection information is to be used from the two pressure values P2 or the information F relating to the refrigerant flow detected by the refrigerant sensor 34, and whether or not the cooling circuit 25 is damaged based on the determined detection information That is, the refrigerant leak detecting means 41 for detecting the presence or absence of refrigerant leak in the cooling circuit 25 is provided.

  The refrigerant leak detection means 41 detects the presence or absence of refrigerant leakage based on the information F regarding the refrigerant flow when the pump 23 is not operating. Specifically, when the flow rate F1 obtained as the information F related to the refrigerant flow exceeds a predetermined flow rate F0, it is determined that there is a refrigerant leak. Here, since the pump 23 is stopped, it is normal that the refrigerant is stationary. For this reason, the state where the flow rate is not zero can be determined as a state where leakage has occurred. That is, F0 = 0 may be set.

  Further, when the pump 23 is operating, the refrigerant leak detection means 41 is in a case where the first pressure value P1 is equal to or higher than a predetermined supercharging pressure value P0, that is, a high supercharging region. The presence or absence of refrigerant leakage is detected based on a differential pressure that is a relative pressure difference between the second pressure value P2 and the first pressure value P1.

  Here, when the intake air is at a high supercharging pressure, there is a tendency that it is easy to determine the presence or absence of refrigerant leakage by the difference in intake air pressure before and after the intercooler 6. On the other hand, when the intake air is at a low to medium supercharging pressure, the difference in intake air pressure before and after the intercooler 6 is small, so that the presence or absence of refrigerant leakage tends not to appear in the numerical values. For this reason, the predetermined supercharging pressure value P0 may be set to, for example, a boundary value between a high supercharging region and a low / medium supercharging region of intake air.

  At this time, when the differential pressure between the second pressure value P2 and the first pressure value P1 exceeds a predetermined reference differential pressure Pm, the cooling circuit 25 is damaged and the refrigerant leaks. It can be judged. The reference differential pressure Pm may be set to, for example, a pressure difference corresponding to a decrease in intake air pressure due to pressure loss in the intercooler 6, or a value obtained by multiplying it by a constant that anticipates an error or the like.

  Further, the refrigerant leak detection means 41 is configured to apply the third pressure when the pump 23 is in operation and the first pressure value P1 is less than the predetermined supercharging pressure value P0, that is, in the low to medium supercharging region. Based on the third pressure value P3 detected by the sensor 33, the presence or absence of refrigerant leakage is detected. Specifically, when the absolute value of the third pressure value P3 exceeds a predetermined predetermined pressure value Pn in the cooling circuit, it is considered that the intake air in the intake passage 1 has entered the cooling circuit 25. Is a state in which the cooling circuit 25 is damaged and a refrigerant leaks (if the pressure state in the intake passage 1 changes, the refrigerant can leak from the cooling circuit 25 side to the intake passage 1 side). Including)

  In addition, since the case where the pressure of the intake air in the intake passage 1 is a positive pressure and the case where it is a negative pressure is assumed, the absolute value of the 3rd pressure value P3 is used for judgment of the presence or absence of the leakage of a refrigerant | coolant. .

  In the case where the pump 23 is not operating, when the refrigerant flow information F by the refrigerant sensor 34 is used for determining whether or not there is a refrigerant leak, it is desirable to close the on-off valve 24. If the on-off valve 24 is opened, the cooling circuit 25 is damaged, and when the refrigerant leaks, the intake air in the intake passage 1 enters not only the return side passage 22 but also the feed side passage 21. For this reason, it is because the flow of the refrigerant | coolant in the location in which the refrigerant | coolant sensor 34 is installed, ie, the flow volume and flow velocity of a refrigerant | coolant accompanying a refrigerant | coolant leak, will become small.

  In addition, when the pump 23 is operating, it is desirable to control the opening / closing of the on-off valve 24 based on the pressure state of the intake air in the intake passage 1. For example, when the pressure of the intake air in the intake passage 1 is a positive pressure or a negative pressure, and the absolute value of the pressure exceeds a predetermined reference pressure, the detection accuracy of the pressure change in the cooling circuit 25 is detected. It is desirable to close the on-off valve 24 in order to increase the speed. Further, when the absolute value of the pressure is equal to or lower than a predetermined reference pressure, the on-off valve 24 may be opened.

  When the leakage of the refrigerant is detected, the electronic control unit 40 issues an alarm notifying the driver of the abnormality of the intercooler 6 by sound, vibration, warning light display, screen display, etc. An abnormality response control means 42 is provided for controlling either the reduction of the supercharging pressure or the discharge of the refrigerant out of the cooling circuit 25.

  Reduction of the supercharging pressure of the intake air by the supercharger 7 can be performed, for example, by opening the waste gate valve 12 of the exhaust bypass passage 11. At this time, it is desirable to control so that an excessive positive pressure and an excessive negative pressure are not generated in the intake passage 1.

  Further, the refrigerant can be discharged out of the cooling circuit 25, for example, by opening the drain valve 26a of the discharge passage 26. Information on the liquid level position of the refrigerant in the intercooler radiator 20 can be acquired by the water level sensor 35, and the electronic control unit 40 continues to open the drain valve 26a until the refrigerant is not supplied to the intercooler 6 side. .

  Hereinafter, based on the flowchart of FIG. 2, the abnormality detection method by the abnormality detection apparatus of the intercooler of this invention is demonstrated.

  First, in step S1, the ignition switch is turned on and the engine is operated.

  In step S2, it is determined whether or not the pump 23 needs to be operated based on the intake air temperature or the like. When the operation of the pump 23 is not necessary, the process proceeds to step S8. In step S8, the drive of the pump 23 is stopped and the on-off valve 24 is closed.

  In subsequent step S9, it is determined whether or not the flow rate F1 obtained as the information F relating to the refrigerant flow is not zero. If the flow rate F1 is zero, it can be determined that the refrigerant has not leaked, so the routine proceeds to step S6 and normal control is continued. If the flow rate F1 is not zero, it can be determined that the refrigerant is leaking. Therefore, the process proceeds to step S10, an alarm is sent to notify the abnormality of the intercooler 6, and the intake of air by the supercharger 7 is excessive. Control such as reduction of supply pressure or discharge of refrigerant out of the cooling circuit 25 is performed. The control in response to these abnormal times may be performed in combination with a plurality of exemplified controls.

  That is, here, it is determined that the information F related to the refrigerant flow is used from the detection information of the first pressure value P1, the second pressure value P2, and the information F related to the refrigerant flow. Based on information F relating to the flow of a certain refrigerant, the presence or absence of refrigerant leakage in the cooling circuit 25 is detected.

  On the other hand, when it is necessary to operate the pump 23, the process proceeds to step S3. In step S3, the pump 23 is driven and the on-off valve 24 is opened.

  In the following step S4, it is determined whether the intake air is in the high supercharging region or the low / medium supercharging region. If it is a high supercharging area | region, it will transfer to step S5. Moreover, if it is a low and medium supercharging area | region, it will transfer to step S7.

  In step S5, on the premise that it is a high supercharging region, if the differential pressure between the second pressure value P2 and the first pressure value P1 exceeds the reference differential pressure Pm, the refrigerant is leaking and To be judged. In this case, the process proceeds to step S10, and the corresponding control at the time of abnormality is performed as in the case described above. When the differential pressure between the second pressure value P2 and the first pressure value P1 is equal to or less than the reference differential pressure Pm, it is determined that the refrigerant has not leaked. In this case, the process proceeds to step S6 and normal control is continued.

  That is, here, it is decided to use the first pressure value P1 and the second pressure value P2 from the detection information of the first pressure value P1, the second pressure value P2, and the information F related to the refrigerant flow, Based on the first pressure value P1 and the second pressure value P2 that are the determined detection information, the presence or absence of refrigerant leakage in the cooling circuit 25 is detected.

  In step S7, on the assumption that it is a low / medium supercharging region, if the absolute value of the third pressure value P3 exceeds the predetermined cooling circuit pressure value Pn, it is determined that a refrigerant leak has occurred. . In this case, the process proceeds to step S10, and the corresponding control at the time of abnormality is performed as in the case described above. When the absolute value of the third pressure value P3 is equal to or less than the predetermined cooling circuit pressure value Pn, it is determined that no refrigerant leakage has occurred. In this case, the process proceeds to step S6 and normal control is continued.

  That is, here, it is decided to use the first pressure value P1 from the detection information of the first pressure value P1, the second pressure value P2, and the information F related to the flow of the refrigerant. By adding detection information of the third pressure value P3 in addition to the certain first pressure value P1, the presence or absence of refrigerant leakage in the cooling circuit 25 is detected.

  In addition, after performing response control at the time of abnormality in step S10, the same control after step S2 is repeated until the engine is stopped. However, it is considered desirable to stop the engine at an early stage in a situation where an abnormality has occurred in the intercooler 6. Further, even after the command to continue the normal control is issued in step S6, the same control in step S2 and subsequent steps is repeated until the engine is stopped.

  The intercooler abnormality detection device according to the present invention can be used in various engines including a diesel engine and a gasoline engine, and a liquid cooling type intercooler that cools a supercharger and intake air. The supercharger may be a supercharger in addition to the turbocharger.

DESCRIPTION OF SYMBOLS 1 Intake passage 2 Exhaust passage 3 Intake valve 4 Exhaust valve 5 Piston 6 Intercooler 7 Supercharger 8 Exhaust purification part (catalyst)
9 Air cleaner 10 Engine 11 Exhaust bypass passage 12 Waste gate valve 13 Throttle valve 20 Radiator for intercooler 21 Feed passage 22 Return passage 23 Pump 24 Open / close valve 25 Cooling circuit 26 Discharge passage 26a Drain valve 27 Reservoir tank 31 First pressure sensor (Intake passage upstream pressure sensor)
32 Second pressure sensor (intake passage downstream pressure sensor)
33 Third pressure sensor (pressure sensor in cooling circuit)
34 Refrigerant sensor (flow meter)
35 Water Level Sensor 40 Electronic Control Unit 41 Refrigerant Leak Detection Unit 42 Abnormal Response Control Unit 43 Control Unit

Claims (7)

A supercharger that supercharges intake air in the intake passage of the engine;
An intercooler provided downstream of the supercharger in the intake passage;
A cooling circuit for supplying a refrigerant to the intercooler;
A pump disposed in the cooling circuit;
A first pressure sensor disposed upstream of the intercooler in the intake passage;
A second pressure sensor disposed downstream of the intercooler in the intake passage;
A refrigerant sensor arranged in the cooling circuit for detecting information on the flow of the refrigerant;
Based on the operating status of the pump, a first pressure value that is a pressure value of intake air detected by the first pressure sensor, a second pressure value that is a pressure value of intake air detected by the second pressure sensor, or the A refrigerant leak detecting means for deciding which detection information to use from information on the refrigerant flow detected by the refrigerant sensor and detecting the presence or absence of refrigerant leak in the cooling circuit based on the decided detection information; ,
An intercooler abnormality detection device comprising: The intercooler abnormality detection device according to claim 1, wherein the refrigerant leak detection unit detects the presence or absence of a refrigerant leak based on information related to the flow of the refrigerant when the pump is not operating. A third pressure sensor disposed in the cooling circuit;
The refrigerant leak detection means is based on a differential pressure between the second pressure value and the first pressure value when the pump is operating and the first pressure value is equal to or higher than a predetermined supercharging pressure value. And detecting whether or not refrigerant leaks based on a third pressure value detected by the third pressure sensor when the first pressure value is less than a predetermined supercharging pressure value. Item 3. The intercooler abnormality detection device according to Item 1 or 2. The cooling circuit is configured in an annular shape with a feed-side passage from which the refrigerant is directed from the intercooler radiator to the intercooler and a return-side passage from the intercooler to the intercooler radiator.
The pump is disposed in the feed passage;
The intercooler abnormality detection device according to claim 1, wherein the refrigerant sensor is disposed in the return-side passage. The intercooler abnormality detection device according to claim 4, wherein an opening / closing valve is provided in the feeding side passage, and the opening / closing valve is closed when the pump is not operating. The intercooler abnormality detection device according to claim 4 or 5, wherein an opening / closing valve is provided in the feed-side passage, and the opening / closing valve is controlled based on a pressure state in the intake passage when the pump is operating. When leakage of the refrigerant is detected, control of any one of issuing an alarm notifying the abnormality of the intercooler, reducing the supercharging pressure of the intake air by the supercharger, or discharging the refrigerant out of the cooling circuit The abnormality detection device for an intercooler according to any one of claims 1 to 6, further comprising an abnormality response control unit that performs the operation.

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