JP2008274867A - Engine cooling device and engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately cool an engine cooled by coolant injection. <P>SOLUTION: This cooling device 1 for an engine 2 is provided with: a water jacket 6 evaporating coolant; an injection nozzle 10a or 10e injecting coolant into the water jacket 6; a pressurizing pump 12 applying injection pressure on the coolant at the injection nozzle 10a or 10e; and an ECU 15 executing injection by controlling the injection nozzle 10a or 10e and the pressurizing pump 12. The engine 2 is cooled and warmed up by changing a quantity of heat absorption by evaporation of coolant by changing pressure in the water jacket 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an engine cooling apparatus using spray cooling that cools an engine by injecting a refrigerant.

  2. Description of the Related Art Conventionally, an engine cooling device employs a forced circulation system in which liquid refrigerant cooled by a radiator is pumped by a water pump and circulated in a water jacket to cool each part of the engine. As a cooling method different from such a cooling method, Patent Document 1 discloses a method in which a refrigerant is injected to a part that becomes high temperature by combustion and the cooling part is cooled by evaporation of the injected refrigerant. Since the cooling method for injecting such a refrigerant uses latent heat when the refrigerant evaporates, the amount of heat exchange between the cooling site and the refrigerant is much larger than that in the forced circulation method, and the same amount is obtained with a smaller amount of refrigerant. A cooling effect is obtained.

  An invention in which a cooling system for injecting such a refrigerant is improved is disclosed in Patent Document 2. The engine cooling device of Patent Document 2 includes a refrigerant injection nozzle having an injection port directed to a cooling chamber space (water jacket), and refrigerant injection according to the engine speed and the engine load when the engine temperature is equal to or higher than a predetermined temperature. A refrigerant is injected from the nozzle into the cooling chamber space. The control device provided in the engine cooling device detects the engine temperature from a temperature sensor embedded in the cylinder block, and determines that the engine has been warmed up when the engine temperature is determined to be equal to or higher than a predetermined temperature. A feed water pump for controlling the amount of refrigerant injected is driven.

JP-A-63-170516 Japanese Patent Laid-Open No. 3-18618

  By the way, it is known that the temperature at which the refrigerant for cooling the engine evaporates, so-called the saturation temperature of the refrigerant, becomes higher as the pressure of the refrigerant is higher, and becomes lower as the pressure of the refrigerant is lower. That is, the saturation temperature of the refrigerant changes depending on the pressure in the water jacket at which the refrigerant evaporates. Thus, when the saturation temperature of the refrigerant changes, the evaporation amount of the refrigerant changes. When the evaporation amount of the refrigerant changes, the engine cooling effect due to the evaporation of the refrigerant is affected. That is, when the pressure in the water jacket becomes high, the saturation temperature of the refrigerant increases. When the saturation temperature rises, the amount of refrigerant evaporated decreases. It is conceivable that such an insufficient amount of refrigerant evaporates results in insufficient cooling of the cooling site and overheating of the engine. Further, when the pressure in the water jacket becomes low, the saturation temperature of the refrigerant decreases. When the saturation temperature decreases, the amount of refrigerant evaporated increases. As described above, it is conceivable that due to excessive evaporation of the refrigerant, the cooling part is supercooled, the viscosity of the lubricating oil is increased, and the friction is increased. However, the engine cooling devices of Patent Document 1 and Patent Document 2 do not perform refrigerant injection in consideration of such a change in pressure in the water jacket and residual refrigerant.

  Then, this invention makes it a subject to cool appropriately the engine which cools by injection of a refrigerant | coolant.

  An engine cooling device of the present invention that solves such a problem includes a water jacket in which refrigerant evaporates, and refrigerant injection means that injects the refrigerant into the water jacket. The pressure in the water jacket is controlled (claim 1). By adopting such a configuration, by changing the pressure in the water jacket, the amount of refrigerant evaporated inside the water jacket, that is, the cylinder head forming the water jacket and the cylinder wall surface is changed. The temperature of the wall surface can be adjusted. Hereinafter, the cylinder head and the cylinder wall surface where the refrigerant evaporates are referred to as an “evaporating portion”. The cooling device changes the pressure in the water jacket and changes the saturation temperature of the refrigerant. Thereby, the cooling device can increase or decrease the evaporation amount of the refrigerant in the water jacket. Since the refrigerant absorbs latent heat at the time of evaporation and cools the evaporation part, when the amount of evaporation of the refrigerant increases or decreases, the cooling state in the evaporation part changes. In this manner, the pressure in the water jacket can be changed to cool and raise the temperature of the refrigerant evaporation section.

  In such an engine cooling apparatus, the refrigerant injection means includes an injection valve that injects refrigerant into the water jacket, a pressurization pump that controls an injection pressure in the injection valve, the injection valve, and the pressurization pump. It is possible to adopt a configuration including control means for controlling the fuel injection and executing injection (claim 2).

  In such an engine cooling device, the refrigerant injection means can reduce the pressure in the water jacket in response to a request for engine cooling, and increase the pressure in the water jacket in response to a request for engine warm-up. (Claim 3). Thereby, cooling and temperature rising of the evaporation part of a refrigerant | coolant can be performed. That is, when the pressure in the water jacket is lowered, the saturation temperature of the refrigerant is lowered and the evaporation amount of the refrigerant is increased. When the evaporation of the refrigerant increases in this way, the latent heat absorbed by the refrigerant at the time of evaporation increases, so that the cooling of the refrigerant evaporation part is promoted. On the other hand, when the pressure in the water jacket rises, the saturation temperature of the refrigerant rises and the evaporation amount of the refrigerant decreases. When the amount of refrigerant evaporated in this way decreases, the latent heat absorbed by the refrigerant during evaporation decreases, so the cooling effect of the refrigerant evaporating portion decreases and the temperature rises.

  In such an engine cooling apparatus, the refrigerant injection means can set the amount of refrigerant injected into the water jacket by referring to the amount of refrigerant evaporated in the water jacket. Thereby, the shortage and excess of the refrigerant | coolant injected to a water jacket can be suppressed. In this way, the shortage of the injected refrigerant is suppressed, and the cooling shortage of the evaporation part of the refrigerant is suppressed. Moreover, since the excessive injection amount of the refrigerant is suppressed, the refrigerant is prevented from remaining in the water jacket without being evaporated. When the refrigerant remaining in the water jacket is suppressed in this way, unnecessary evaporation of the refrigerant in a state where cooling is not required is suppressed, so that overcooling of the engine is suppressed. In this way, the cooling device can keep the cooling unit at an appropriate temperature.

  Further, the engine cooling apparatus includes a temperature measuring unit that measures the temperature in the water jacket, a pressure measuring unit that measures the pressure in the water jacket, and temperature information acquired from the temperature measuring unit. And an injection control means for determining an injection pressure and / or an injection amount of the refrigerant into the water jacket by the refrigerant injection means based on the pressure information acquired from the pressure measuring means. (Claim 5). By adopting such a configuration, the cooling device calculates information on factors determining the amount of saturated vapor of the refrigerant and the cooling capacity by evaporation from the temperature information and pressure information in the water jacket, and the refrigerant injection pressure and / or The injection amount can be determined. The injection pressure and the injection amount of refrigerant thus determined are injected from the injection control means.

  Further, in such an engine cooling device, a condenser that condenses the refrigerant evaporated in the water jacket, a pressure regulating valve that is disposed between the water jacket and the condenser, and the pressure regulating valve include It can be set as the structure provided with the pressure valve control means to control (Claim 6). By setting it as such a structure, the refrigerant | coolant amount in a water jacket can be increased / decreased and the pressure in a water jacket can be controlled. Thereby, the evaporation amount of the refrigerant in the water jacket can be increased or decreased to cool and elevate the temperature of the refrigerant evaporating part.

  The engine of the present invention incorporating such a cooling device includes a water jacket in which refrigerant evaporates, refrigerant injection means for injecting refrigerant into the water jacket, and waste heat of the engine via the refrigerant evaporated in the water jacket. And the refrigerant injection means controls the pressure in the water jacket by the injection pressure of the refrigerant (Claim 7). With such a configuration, the waste heat of the engine obtained by evaporation of the refrigerant in the water jacket can be recovered by converting it into electric energy or the like with a power recovery machine.

  Further, the refrigerant injection means of such an engine controls the pressure in the water jacket by the injection pressure of the refrigerant, and refers to the evaporation amount of the refrigerant in the water jacket, thereby injecting the refrigerant into the water jacket. Can be configured (claim 8). Thereby, it can set so that the refrigerant | coolant amount according to the maximum amount which can be evaporated on the conditions of the pressure in the water jacket at the time of the injection of a refrigerant | coolant, and temperature will be injected. As a result, the amount of vapor refrigerant that can be recovered under the pressure and temperature conditions can be increased. That is, the energy that can be recovered from the waste heat of the engine can be increased. For this reason, waste heat recovery efficiency can be improved.

  The engine cooling device of the present invention includes a water jacket in which the refrigerant evaporates, and a refrigerant injection unit that injects the refrigerant into the water jacket and controls the pressure in the water jacket by the injection pressure of the refrigerant. The engine can be cooled and warmed up to an appropriate temperature by changing the pressure in the water jacket and changing the amount of heat absorbed by the evaporation of the refrigerant.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of an engine 2 incorporating the cooling device 1 of the present embodiment. The engine 2 includes a piston 3, a cylinder block 4, and a cylinder head 5 together with the cooling device 1. The cylinder block 4 and the cylinder head 5 are formed with a water jacket 6 through which refrigerant flows. The water jacket 6 on the cylinder head 5 side is formed around the intake valve 7 and the exhaust valve 8 assembled to the cylinder head 5.

  The cooling device 1 includes a first injection nozzle 10a to a fifth injection nozzle 10e, a liquid path 11, a pressure pump 12, a temperature sensor 13, a pressure sensor 14, and an ECU (Electronic Control Unit) 15. The first injection nozzle 10a to the fifth injection nozzle 10e, the liquid path 11, the pressurizing pump 12, and the ECU 15 correspond to the refrigerant injection means of the present invention. The cooling device 1 also includes a refrigerant tank 16, a vapor path 17, a condenser 18, and a pressure adjustment valve 19.

  The first injection nozzle 10 a to the fifth injection nozzle 10 e inject refrigerant into different cooling portions in the water jacket 6. These injection nozzles inject a refrigerant amount of refrigerant according to an injection command transmitted from the electrically connected ECU 15.

  The first injection nozzle 10a and the second injection nozzle 10b are mounted on the cylinder block 4 with their injection ports exposed in the water jacket 6 on the cylinder block 4 side. The injection port of the first injection nozzle 10a and the injection port of the second injection nozzle 10b are arranged so as to inject refrigerant toward the side surface of the water jacket 6 on the cylinder bore wall 6a side.

  The third injection nozzle 10c, the fourth injection nozzle 10d, and the fifth injection nozzle 10e are mounted on the cylinder head 5 with their injection ports exposed in the water jacket 6 on the cylinder head 5 side. The injection port of the third injection nozzle 10c is arranged to inject refrigerant toward the intake valve 7 side, and the injection port of the fourth injection nozzle 10d is arranged to inject refrigerant toward the exhaust valve 8 side. Has been. The injection port of the fifth injection nozzle 10e is arranged to inject the refrigerant toward the upper part of the combustion chamber.

  One end of the liquid path 11 is connected to the pressurizing pump 12. The liquid path 11 is branched in the middle of the path, and each of the branched ends is connected to the first injection nozzle 10a to the fifth injection nozzle 10e. The refrigerant flows from the pressurizing pump 12 in the liquid path 11 to each injection nozzle.

  The pressurizing pump 12 is a pump that controls the injection pressure at each injection nozzle. The pressurizing pump 12 is electrically connected to the ECU 15, and pumps the refrigerant from the refrigerant tank 16 based on a signal transmitted from the ECU 15, pressurizes the refrigerant, and pumps the refrigerant to each injection nozzle.

  The temperature sensor 13 and the pressure sensor 14 are disposed in the water jacket 6 on the cylinder block 4 side, the temperature sensor 13 corresponds to the temperature measuring means of the present invention, and the pressure sensor 14 corresponds to the pressure measuring means of the present invention. To do.

  The ECU 15 is electrically connected to the first injection nozzle 10a to the fifth injection nozzle 10e and the pressurization pump 12, and controls each injection nozzle and the pressurization pump 12 to execute injection. Further, each of the temperature sensor 13, the pressure sensor 14, and the pressure adjustment valve 19 is electrically connected. The ECU 15 injects the refrigerant into the water jacket 6 by the first injection nozzle 10a to the fifth injection nozzle 10e based on the temperature information acquired from the temperature sensor 13 and the pressure information acquired from the pressure sensor 14. Determine pressure and injection volume. The ECU 15 transmits a signal corresponding to the determined injection pressure to the pressure pump 12, and transmits an injection command to each injection nozzle according to the determined injection amount. Thus, ECU15 which controls injection of a refrigerant | coolant is equivalent to the injection control means of this invention.

  One end of the steam path 17 is connected to the cylinder head 5 side of the water jacket 6, and the other end is connected to the condenser 18. The refrigerant evaporated in the water jacket 6 flows into the condenser 18 through the vapor path 17.

  The condenser 18 cools, condenses, and returns the refrigerant evaporated in the water jacket 6 to a liquid state. The refrigerant liquefied by the condenser 18 is sent to the refrigerant tank 16.

  The pressure regulating valve 19 is disposed between the water jacket 6 and the condenser 18 in the steam path 17. The pressure adjustment valve 19 is electrically connected to the ECU 15 corresponding to the pressure valve control means of the present invention, and receives a command signal from the ECU 15 to increase or decrease the amount of refrigerant flowing through the steam path 17.

  Further, the engine 2 is provided with a superheater 21 and a power recovery machine 22. The superheater 21 and the power recovery machine 22 are arranged so as to contact the steam path 17 between the pressure regulating valve 19 and the condenser 18. These are arranged in the order of the superheater 21 and the power recovery machine 22 from the side close to the pressure regulating valve 19.

  The superheater 21 is disposed so as to come into contact with an exhaust pipe 23 that exhausts exhaust gas generated by combustion of the engine 2 to the outside, and heat from the exhaust gas through the exhaust pipe 23 to the vapor refrigerant through the steam path 17. The steam refrigerant to a high temperature.

  The power recovery machine 22 recovers engine waste heat through the refrigerant evaporated in the water jacket 6. The power recovery machine 22 is driven by the refrigerant having a high temperature in the superheater 21 and converts the thermal energy of the refrigerant into electric energy to recover the energy.

  Next, operation | movement of the cooling device 1 of the present Example comprised in this way is demonstrated. The cooling device 1 of the present embodiment blows the refrigerant pressurized by the pressure pump 12 from the first injection nozzle 10a to the fifth injection nozzle 10e to the cylinder bore wall 6a and the cylinder head 5, that is, the evaporation section. The cooling device 1 cools the evaporating unit by utilizing the latent heat of the evaporating unit when the blown refrigerant evaporates. Thus, the refrigerant that has evaporated from the evaporation section and absorbed heat flows into the superheater 21 through the vapor path 17. The refrigerant evaporated in the superheater 21 is heated to high temperature by the waste heat of the exhaust gas and flows into the power recovery machine 22. The power recovery machine 22 recovers the thermal energy of the high-temperature vapor refrigerant as electrical energy. The refrigerant that has passed through the power recovery machine 22 is sent to the refrigerant tank 16, and is again sent by the pressure pump 12 to circulate in the system. Thus, the cooling device 1 cools the engine 2 by evaporation of the refrigerant to be injected. Further, the waste heat of the engine 2 recovered by this cooling is recovered.

  Next, the operation of the cooling device 1 in an operating state that requires cooling of the engine 2 that is cooled in this way and recovers waste heat will be described. For example, when the engine 2 is at a high temperature, such as during high load operation, the necessity for cooling becomes higher. In such a case, the ECU 15 of the cooling device 1 reduces the injection pressure of the refrigerant by the pressure pump 12. Thereby, the pressure of the refrigerant | coolant injected from each injection nozzle falls. In this way, the pressure in the water jacket 6 decreases due to a decrease in the pressure of the injected refrigerant.

  At the same time, the ECU 15 increases the amount of refrigerant passing through the pressure regulating valve 19 and increases the refrigerant flowing through the vapor path 17. Thereby, since the refrigerant in the water jacket 6 flows out to the condenser 18, the pressure in the water jacket 6 decreases.

  As described above, when the necessity for cooling the engine 2 increases, the pressure in the water jacket 6 is decreased. Thereby, the temperature which the refrigerant | coolant in the water jacket 6 evaporates falls. Thus, when the temperature at which the refrigerant evaporates decreases, the amount of refrigerant evaporated increases. When the amount of evaporation of the refrigerant increases, the amount of heat absorbed as latent heat when the refrigerant evaporates increases, and the cooling effect in the evaporation section is improved. Thereby, the cooling device 1 suppresses overheating of the engine 2 and suppresses overheating.

  Next, the operation of the cooling device 1 in an operation state where the engine 2 needs to be warmed up will be described. For example, when the engine 2 is in a low load operation, warm-up may be required to maintain the optimum temperature for the operation of the engine 2. When such a warm-up request for the engine 2 is requested, the ECU 15 of the cooling device 1 increases the injection pressure of the refrigerant by the pressurizing pump 12. Thereby, the pressure of the refrigerant | coolant injected from each injection nozzle rises. Thus, the pressure in the water jacket 6 increases as the pressure of the injected refrigerant increases.

  In addition, the ECU 15 reduces the amount of refrigerant flowing through the vapor path 17 by reducing the amount of refrigerant passing through the pressure regulating valve 19. Thereby, since a refrigerant | coolant remains in the water jacket 6, the pressure in the water jacket 6 rises.

  Thus, when the engine 2 needs to be warmed up, the pressure in the water jacket 6 is increased. As a result, the temperature at which the refrigerant in the water jacket 6 evaporates increases. Thus, when the temperature at which the refrigerant evaporates increases, the amount of refrigerant evaporated decreases. When the evaporation amount of the refrigerant decreases, the amount of heat absorbed as latent heat when the refrigerant evaporates decreases, so that cooling in the evaporation unit is suppressed. Thereby, warm-up by the heat generated by the combustion of the engine 2 is promoted.

  Thus, the cooling device 1 controls the cooling and warm-up of the engine 2 by changing the injection pressure of the refrigerant injected into the water jacket 6. Next, effects of the cooling device 1 will be described. FIG. 2 is an explanatory diagram showing an outline of the relationship between the temperature and the saturated water vapor temperature with respect to the engine load and the wall temperature of the engine. The vertical axis of the explanatory diagram of FIG. 2 indicates the temperature, the horizontal axis indicates the engine load, the solid line in the figure indicates the wall temperature of the engine 2 of the present embodiment, and the dotted line indicates the wall temperature of the conventional engine. Is shown. Moreover, the broken line in a figure has shown the saturated water vapor | steam temperature of the refrigerant | coolant in the water jacket 6 of the engine 2 of a present Example.

  The saturated water vapor temperature decreases as the load on the engine 2 increases. The cooling device 1 reduces the injection pressure of the refrigerant into the water jacket 6 as the engine 2 becomes a higher load. For this reason, the saturated water vapor temperature in the water jacket 6 decreases as the load of the engine 2 increases. Thus, by reducing the saturated water vapor temperature, the evaporation of the refrigerant is promoted and the evaporation amount is increased. When the amount of evaporation of the refrigerant increases, the amount of heat absorbed by the refrigerant during evaporation increases, so that the cooling effect of the wall temperature of the engine 2 increases. For this reason, the wall temperature of the engine 2 of this embodiment at the time of high load is lower than the wall temperature of the conventional engine. On the other hand, the cooling device 1 increases the injection pressure of the refrigerant into the water jacket 6 as the engine 2 becomes lighter. For this reason, the saturated water vapor temperature in the water jacket 6 increases as the load of the engine 2 decreases. Thus, the evaporation amount of the refrigerant is reduced by increasing the saturated water vapor temperature. When the evaporation amount of the refrigerant decreases, the amount of heat absorbed by the refrigerant during evaporation decreases, so the cooling effect of the wall temperature of the engine 2 decreases. As a result, warm-up due to combustion of the engine 2 is promoted, and the wall temperature of the engine 2 of the present embodiment at the time of low load increases as compared with the wall temperature of the conventional engine.

  As described above, the cooling device 1 for the engine 2 of the present invention lowers the wall temperature of the engine at the time of high load, and raises the wall temperature of the engine at the time of low load to approach a constant value. Thereby, the change of the sliding state with the piston 3 due to the thermal expansion of the cylinder bore wall 6a can be reduced, and the friction caused by the lubricating oil having a high viscosity at a low temperature can be reduced. In addition, since the change in wall temperature is reduced, the thermal fatigue of the metal due to repeated cooling and overheating can be reduced, and the life of the part can be extended.

  Further, the ECU 15 of the cooling device 1 calculates the evaporation amount of the refrigerant in the water jacket 6 from the temperature information and pressure information in the water jacket 6 acquired from the temperature sensor 13 and the pressure sensor 14, and refers to this evaporation amount. The injection quantity of the refrigerant is set. That is, the ECU 15 calculates the maximum amount of refrigerant that can be evaporated at the temperature and vapor pressure of the refrigerant in the water jacket 6. The ECU 15 determines the amount of refrigerant calculated in this way as the injection amount, and causes each injection nozzle to execute injection.

  As described above, the cooling device 1 suppresses the shortage or excess of the amount of refrigerant injected into the water jacket 6. Thereby, since the shortage of the injection amount of the refrigerant is suppressed, insufficient cooling of the evaporation unit can be suppressed. Further, since the excessive injection amount of the refrigerant is suppressed, it is possible to suppress the refrigerant from remaining in the water jacket 6 without being evaporated. When the remaining refrigerant is suppressed in this manner, unnecessary cooling of the refrigerant is suppressed when the engine 2 needs warming up, so that overcooling of the engine 2 is suppressed.

  Moreover, since the cooling device 1 uses the maximum amount of refrigerant that can be evaporated at the temperature and vapor pressure of the refrigerant in the water jacket 6 as the injection amount, it obtains as much heat as possible from the engine 2 under the conditions. It will be. In this way, the engine 2 collects as much heat as possible from the acquired heat quantity by the power recovery machine 22 to increase the waste heat recovery efficiency.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope.

It is explanatory drawing which showed schematic structure of the engine in which the cooling device of the Example was integrated. It is explanatory drawing which showed the outline of the relationship of the saturated water vapor | steam temperature with respect to an engine load, and the wall temperature of an engine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Engine 4 Cylinder block 5 Cylinder head 6 Water jacket 10a 1st injection nozzle 10b 2nd injection nozzle 10c 3rd injection nozzle 10d 4th injection nozzle 10e 5th injection nozzle 11 Liquid path 12 Pressure pump 13 Temperature sensor 14 Pressure sensor 15 ECU
17 Steam path 18 Condenser 19 Pressure regulating valve 21 Superheater 22 Power recovery machine 23 Exhaust pipe

Claims (8)

A water jacket where the refrigerant evaporates;
Refrigerant injection means for injecting refrigerant into the water jacket;
With
The engine cooling device according to claim 1, wherein the refrigerant injection means controls a pressure in the water jacket by an injection pressure of the refrigerant. The engine cooling device according to claim 1,
The refrigerant injection means, an injection valve for injecting refrigerant into the water jacket;
A pressurizing pump for controlling the injection pressure in the injection valve;
Control means for controlling the injection valve and the pressurizing pump to execute injection;
An engine cooling system comprising: The engine cooling device according to claim 1,
The refrigerant injection means reduces the pressure in the water jacket in response to a request for engine cooling,
An engine cooling device that increases the pressure in the water jacket in response to a request for engine warm-up. The engine cooling device according to claim 1,
The cooling device for an engine, wherein the refrigerant injection means sets an injection amount of the refrigerant to the water jacket with reference to an evaporation amount of the refrigerant in the water jacket. The engine cooling device according to claim 1.
Temperature measuring means for measuring the temperature in the water jacket;
Pressure measuring means for measuring the pressure in the water jacket;
Based on the temperature information acquired from the temperature measuring means and the pressure information acquired from the pressure measuring means, an injection pressure and / or an injection amount of the refrigerant into the water jacket by the refrigerant injection means is determined. Injection control means;
An engine cooling system comprising: The engine cooling device according to claim 1,
A condenser for condensing the refrigerant evaporated in the water jacket;
A pressure regulating valve disposed between the water jacket and the condenser;
Pressure valve control means for controlling the pressure regulating valve;
An engine cooling system comprising: A water jacket where the refrigerant evaporates;
Refrigerant injection means for injecting refrigerant into the water jacket;
A power recovery machine that recovers waste heat of the engine through the refrigerant evaporated in the water jacket;
With
The engine, wherein the refrigerant injection means controls a pressure in the water jacket by an injection pressure of the refrigerant. A water jacket where the refrigerant evaporates;
Refrigerant injection means for injecting refrigerant into the water jacket;
A power recovery machine that recovers waste heat of the engine through the refrigerant evaporated in the water jacket;
With
The refrigerant injection means controls the pressure in the water jacket by the injection pressure of the refrigerant, and sets the injection amount of the refrigerant to the water jacket with reference to the evaporation amount of the refrigerant in the water jacket. To engine.

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