JPS61129417A - Evaporative cooling apparatus of internal-combustion engine - Google Patents

Abstract

PURPOSE:To enable an in-system temperature to be promptly controlled in a follow-up manner to the target temperature with no influence by a disturbance of vehicle ran air or the like, by forcedly lifting a level of coolant fluid in a condenser, in the case of an apparatus cooling an engine by evaporation of a liquid phase coolant. CONSTITUTION:An internal-combustion engine 1 constitutes a coolant circulating system by connecting a water jacket 2, condenser 3 condensing coolant vapor generated by heating in this water jacket 2 and a supply coolant pump 4 through a coolant circulating passage 15 or the like into a closed circuit. A portion in the downstream side of the pump 4 in the above described coolant circulating passage 15 connects a reservoir tank 21 through a three-way type solenoid valve 16 and an auxiliary coolant passage 23. While the uppermost part of the coolant circulating system is connected with a bottom part of the reservoir tank 21 by an air discharge passage 24 interposing a normally open type solenoid valve 25. And each solenoid valve 16, 25 and the pump 4 are controlled through a control device 31 in accordance with an output of a liquid level sensor 32 and a temperature sensor 33 additionally provided in the water jacket 2.

Description

[Detailed Description of the Invention] Industrial Application Field This invention stores a liquid phase refrigerant in a water jacket and cools an internal combustion engine by boiling and vaporizing the liquid phase refrigerant. Conventional technology related to boiling cooling systems for internal combustion engines, in which the generated refrigerant vapor is condensed in a condenser and reused In addition to directly affecting knock performance, it also affects friction loss due to oil viscosity, and is a factor that affects the engine's fuel consumption rate, maximum output, and noise level. However, in the conventional general water-cooled cooling system,
Flow 1i with thermostat! This only prevents excessive cooling during warm-up by switching the 0N-
Temperature-dependent by OFF It is completely impossible to set the target temperature accurately and follow the target temperature with good response, and considering the above-mentioned thermal efficiency and the like, it is impossible to realize a highly accurate temperature classification a.

In contrast to the above-mentioned deep cooling system that utilizes simple temperature changes in the cooling water, cooling that utilizes the phase change between the liquid phase and gas phase of the refrigerant (cooling water)! Various types of ambiguity have also been proposed (for example, Japanese Patent Publication No. 57-57608).

(Japanese Unexamined Patent Publication No. 57-62912, etc.) This basically involves boiling the liquid phase refrigerant stored in the water jacket, and guiding the generated vapor to an external condenser (radiator) to liquefy the heat. After that, the refrigerant is circulated and supplied again into the water jacket, which has the advantage of maintaining the temperature uniformly at all refrigerant line points in each part of the water jacket, and dramatically increasing the heat exchange efficiency in the condenser. has been done. And if you use phase change like this, what about the pressure inside the water jacket? Since the boiling point of the liquid phase solid medium can be arbitrarily and quickly changed by variable control, there is an OT capability that can realize temperature-specific temperature response with good response depending on the operating conditions.

Problems to be Solved by the Invention However, in the conventional A cooling system 4R, the temperature immediately changes depending on the system pressure as described above, which actually makes it difficult to put this type of cooling system into practical use. One of the major drawbacks is that the configuration in which the cooling system consisting of water jackets, condensers, etc. is hermetically sealed causes engine heat generation to vary widely when applied to, for example, automatic employment agencies. η Also, since the heat dissipation capacity of an efficient capacitor is mostly controlled by the size of the self-propelled wind, the equilibrium between the two is easily disrupted, and this immediately appears as a temperature change, causing the cooling fan's air flow to the capacitor to be reduced. It is impossible to bring it down by changing it to some extent and changing it to around 9.

Therefore, as seen in the above-mentioned Japanese Patent Publication No. 57-57608 and Japanese Patent Application Publication No. 57-62912, conventional devices have a substantially non-sealed structure by partially communicating the inside of the cooling system with the atmosphere. The boiling point of the refrigerant is fixedly maintained at atmospheric pressure, and as a result, constant temperature control according to the operating conditions as described above has not been realized.

If the cooling system is completely sealed with a water jacket, etc., it is necessary to thoroughly remove all the air, which is a non-condensable gas, from the system. If the capacitor is sealed tightly, the heat dissipation ability of the capacitor will be significantly reduced, which may lead to abnormally high temperatures.

This invention was made against the above-mentioned technical background, and its purpose is to be able to reliably remove air from the inner blades of a sealed cooling system, and to be able to use an automatic passing mechanism. In cases where the amount of heat generated by the engine and the amount of air flowing through the vehicle used for cooling vary widely, the engine temperature t-
A boiling cooling system that can be controlled reliably and with good responsiveness according to engine operating conditions, etc.? It is about providing. In addition, we have simplified the configuration of other purpose frames, refrigerant passages, etc. as much as possible, and we have also made sure to keep the pumps etc. in one place! The purpose is to have a configuration with fewer MR parts.

Means for Solving All Problems The S# cooling device for an internal combustion engine according to the present invention includes a water jacket in which a liquid phase refrigerant is stored, a fta vapor generated in the water jacket is introduced, and a It is equipped with a condenser in which condensed liquid-phase refrigerant is stored, and a refrigerant circulation passage that communicates the lower part of the condenser with the quarter jacket. A reservoir tank is provided. One end of the auxiliary refrigerant passage is connected to the above-mentioned refrigerant circulation passage, and the other end is connected to the above-mentioned reservoir tank. Between the condenser of the refrigerant circulation passage and the auxiliary refrigerant passage connection part, a refrigerant supply pump configured to be able to feed in both forward and reverse directions is interposed, and the refrigerant supply pump is connected to the connection part VC. A flow path switching mechanism is provided for selectively communicating O 1 with the water jacket or the reservoir tank. One end of an air exhaust passage is connected to the top of the refrigerant circulation system. This air discharge passage has an on-off valve, and the other end is opened to the atmosphere within the reservoir tank or the like. It has a liquid level detection means for detecting the liquid level position of the liquid phase refrigerant in the water jacket, and a temperature detection means for directly or indirectly detecting the refrigerant temperature Vt in the water jacket, and further includes a temperature detection means for detecting the refrigerant temperature Vt in the water jacket directly or indirectly. It is equipped with a control device that controls the pump, flow path switching device m, and on-off valve according to a predetermined program.

Effect J: In the configuration described above, under normal operating conditions, the refrigerant circulation system is kept in a closed state, and the refrigerant boils inside the system.
The cycle of condensation is repeated. That is, the liquid phase refrigerant is stored in the quarter jacket to an appropriate level, and when the liquid level drops due to boiling, the liquid phase refrigerant is condensed and recovered from the condenser by the refrigerant supply bomb 1, and the liquid phase refrigerant is replenished. , there is a significant difference between when the inside of the condenser is liquid-phase refrigerant and when it is gas-phase refrigerant, and when gas-phase refrigerant coexists in the upper part and liquid-phase refrigerant in the lower part, only the gas-phase refrigerant area is substantially This is the heat dissipation area. By controlling the height of the liquid level using the liquid, the heat dissipation capacity can be controlled arbitrarily and over a wide range.

This condenser liquid level control is realized by forcibly transferring the liquid phase refrigerant between the reservoir tank and the reservoir tank by switching the flow path switching mechanism and switching the feeding direction of the refrigerant supply pump. , As mentioned above, since the refrigerant circulation system consisting of the water jacket etc. is in a sealed state, the condenser discharge #1
If the balance between the amount of refrigerant condensation, which is determined by the capacity, and the amount of eM gas generated according to the amount of heat generated on the water jacket side is lost, the internal pressure will immediately fluctuate, and the water The temperature inside the jacket rises or falls quickly. This makes it possible to achieve temperature control with high precision and good responsiveness, and the temperature range that can be turned over is extremely large. From there, a fairly wide range of temperatures? ill.

- In order to operate the refrigerant circulation system in a sealed state as described above, it is necessary to remove air, which is a non-condensable gas, from the blade 1 in the system. This is achieved by completely filling the phase refrigerant and at the same time opening the air exhaust passage to push out the air. To fill the system with gold liquid phase refrigerant, the liquid phase I? medium is forcibly introduced.

゛Example 1 Is Figure 1 an example of the boiling cooling device according to the present invention? In the same figure, an internal combustion engine is provided with a 1rt water jacket 2, 3 is a t-th condenser for condensing a vapor phase refrigerant, and 4 is an electric refrigerant supply boy 7f.

The water jacket 2 is fitted over both the cylinder block 5 and the cylinder head 60 so as to surround the outer periphery of the cylinder and combustion chamber of the internal combustion engine 1, and the upper part, which is normally a gas phase space, is for each cylinder. They are in communication with each other, and a steam volume lower is provided at an appropriate position above them. This steam volume lower communicates with the upper part 3a of the condenser 3 via a connecting pipe 8 and nine steam passages, and a discharge pipe attachment part 8a which is the top of the refrigerant circulation system is connected to the connecting pipe 8. It is formed upwardly and in a regular shape, and its upper opening is sealed by a cap 10.

It is composed of an upper tank 11 having the above-mentioned condenser 3ζ and the above-mentioned population 3ae, a core s12 mainly consisting of fine tubes in the vertical direction, and a lower tank 13 that temporarily stores the liquefied refrigerant condensed in this core 12, For example, it is placed in a position such as the front of both cars that is suitable for one round of vehicle running, and is also equipped with an electric cooling fan 14t for forced cooling on the front or back side.
1 at the bottom of 3? Medium circulation if! -15 is connected, and the other end of this refrigerant circulation passage 15 is provided on the 7-cylinder head 6 side of the water jacket 2 and connected to the refrigerant port 2a. And the refrigerant circulation passage 1
A three-way type second solenoid valve 16 serving as a flow path switching mechanism is interposed in the middle part of the brush 5, and this brush second section solenoid valve 16
A refrigerant supply pump 4 is interposed between the a-tank 13 and the a-tank 13 .

21c, upper 4 water jacket 2 and capacitor 3f
C is the main body and t is a 1p reservoir tank installed outside the circulation system, which is rjil! It is open to the atmosphere via a pipe 122 having an air function, and is installed at a height t'Wt' that is approximately the same as the water jacket 2, and an auxiliary refrigerant passage 23 is connected to the bottom thereof. The tip of this auxiliary refrigerant passage 23 is the 21st! The magnetic valve 16 is connected to the refrigerant circulation passage 15 through the entire magnetic valve 16 .

If the above-mentioned second magnet 4P16 is used, the refrigerant 1 skin ring passage 15t is blocked off in the excitation cap, and the reservoir tank 21 and the lower tank 13 are
In the non-excited state, the auxiliary refrigerant passage 23 is closed and the refrigerant circulation passage 15yr is in communication (flow path B). The refrigerant supply pump 4 is one that can pump the liquid phase refrigerant in both forward and reverse directions.If the refrigerant supply pump 4 is driven in the forward direction in the state of the flow path A, the refrigerant is transferred from the lower tank 13 to the reservoir. The liquid phase refrigerant can be forcibly discharged to the tank 21, and if driven in the opposite direction, the liquid phase refrigerant can be discharged from the reservoir tank 21 to the lower tank 13.
Liquid phase cooling g? In addition, if the refrigerant supply pump 4f is driven in the forward direction in the state of the flow path B, the liquid phase refrigerant can be circulated and supplied from the lower tank 13 to the water jacket 2. Discharge pipe attachment part 8B at the top
VC frame, a small air exhaust passage 24 that exhausts the air in the system
The distal end of the air discharge passage 24 opens at a relatively lower portion of the reservoir bank 21 in order to simultaneously recover the liquid phase refrigerant during air discharge. The air discharge passage 24 is provided with a normally open first
? An 1E magnetic valve 25 is interposed.

Each of the Kla valves 25 and 16, the refrigerant supply pump 4 and the cooling 7 Tn 14i are turned over on the driving side by the T control rMI@#31 using a so-called microcomputer system, and specifically, they are installed in the water jacket 2. T: 1f surface sensor 32. Temperature sensor 33. Lower tank 1
3, and the negative pressure switch 35 provided at the top of the circulation system. 11-A float type sensor using a dosinoch is used to detect whether the refrigerant liquid level has reached a set level in a Keon-Off manner, and the first liquid sensor 3
The detection level of the second liquid level sensor 34 is set at a height position of 8 degrees in the path of the printer head 6, and the detection level of the second liquid level sensor 34 is set at a height position above the opening area of the refrigerant circulation passage 15. The temperature sensor 33 is configured to be, for example, a thermistor, and is usually installed at a position where it is immersed in the liquid phase refrigerant or at a position where it is a gas phase refrigerant region, and is set to the position where the refrigerant in the water jacket 2 is in contact with the refrigerant. Detecting temperature. In addition, the negative pressure switch 35 is a 7-ton diaphragm that responds to the differential pressure between atmospheric pressure and system pressure, and is designed to ensure that the system is under negative pressure relative to the atmospheric pressure in the usage environment, regardless of whether it is used in highlands or lowlands. Detect whether or not, specifically, -30 mHg to -50
The operating pressure is set to about mk.

Of course, the keyaki sensors that detect other machine-related turning conditions are not mentioned.

Next, Figures 21 to 11 are 70-charts showing the contents of 'full m' executed by control @ # 31, which will be explained below along the flow from engine start to stop. explain. In addition, Haya 1 and @2 in the figure are magnetic valve 2.
5 and 16 are abbreviated as ``electromagnetic valve ■'' and ``electromagnetic valve ■'', and the liquid level of the fixed water jacket 2 yen is abbreviated as ``rC/HC/''.

Fig. 2 is a main flowchart showing the A required amount for side overturning, and when the side overturning is started by starting the engine (ignition key ON), initialization processing in step 1 (see Fig. 4) is performed after step 7. , first of all, since the start is an initial start or a restart is not possible, the specific VC is the temperature sensor 33.
Determine whether the detected temperature is higher than a predetermined temperature (for example, 45 degrees Celsius) (step 2). If the temperature is below the predetermined temperature, that is, the initial startup is not warmed up, step 3, the air exhaust control is performed.
After that, proceed to step 4, warm-up and open, and then control the temperature.

The control loop of steps 5 to 10, such as turning the liquid level to its side, is repeated until the key is turned off. If the temperature is higher than the predetermined temperature in step 2, that is, when restarting & air intrusion over time is not considered, so air exhaust control (step 3) is omitted.On the other hand, the interrupt processing routine shown in Figure 3 is correct. It is executed every time, and here it is judged whether the key is ON or not (step 11).If 0 key OFF is input, and if it is, d1 is detailed in Fig. 11. (
Certain processing according to step 12)? The power turns off after
F and the series of controls ends. 5th figure shows a flowchart of the air exhaust control in step 3, which is executed immediately after starting the engine. Note that when starting this engine, normally the system is The 0 air discharge system, which is almost filled with liquid phase refrigerant (for example, a mixture of water and antifreeze) and is in the t state, and the reservoir tank 21 has approximately the appropriate amount of liquid phase refrigerant stored, is further removed from this state. All air is discharged by completely filling the system with liquid phase refrigerant. By driving the supply pump 4fr in the opposite direction (step 32), the liquid phase refrigerant in the tank 21 is forcibly introduced into the system through the entire auxiliary refrigerant passage 23.

In this case, in step 33, water remains in the system for a predetermined period of time, specifically, the software timer is set in advance to be sufficient to fill the system with water, and continues for several seconds to several tens of seconds. The tank 2 is placed in the upper part of the system, and the tank 2 is removed from the system through the entire air exhaust passage 24.
It is forcibly ejected into 1. Then, after a predetermined period of time has passed, 7
Refrigerant supply pump at point 4? OFF (Stella 13
4) and proceed to the warm-up side a (step 4) shown in the 6th prisoner 0. At the time when the warm-up side moves to the warm-up open side, the inside of the condenser 3 is filled with liquid phase refrigerant and is in the state t.ηλ et al. The heat dissipation capacity of the condenser 3 is suppressed to an extremely low level, and as a result, the temperature of the refrigerant within the water jacket 2 quickly rises, and boiling soon begins. On the warm-up side 'fIIJ, the first solenoid valve 25 is set to "closed" and the second solenoid valve 16 is set to "flow path A" (step 41), and the system is filled with all liquid phase refrigerant and the water is in the t state. The system waits until the temperature of the refrigerant in the jacket 2 rises to the target temperature, and in step 42, the actual detected temperature is compared with the set temperature (anatomical accuracy), and the detected temperature is determined to be the "set temperature".
When the temperature reaches 10 degrees Celsius (α ℃), the system is completely sealed (step 44), and this system is completely terminated. The above set temperature is optimally set within the range of, for example, 80 to 110 degrees Celsius, depending on the operating conditions such as the load and rotation speed of the gate, and is set at regular intervals by the interrupt processing shown in Figure 3. It is updated (step 15). In addition, in the case of the electronic side fuel injection method shown in the illustrated example, the optimum set temperature is determined based on the pulse width and period (step 14) of the injector drive pulse.On the other hand, when restarting, The gas phase refrigerant region has already expanded in the system, and some refrigerant flows out from the system through the refrigerant supply pumps 4 and 1!2 through the magnetic valve 16, so before the refrigerant temperature reaches the set temperature, The liquid level in the water jacket z or the liquid level in the lower tank 13 may drop excessively, and if the liquid level of either one falls below the set level of the first liquid level sensor 32 or the second liquid level sensor. When it comes down to the bottom
crf, i [End this control immediately (step 43)
.

After the warm-up control is completed, steps 5 to 100 are repeated as described above, but this control loop is performed when the cooling fan 14 is
More detailed temperature control a? The fan control in step 5 (Fig. 7), the liquid level tilting in step 6 (Fig. 8) to keep the liquid level in the water jacket 2 above the set level by circulating liquid refrigerant VC, and the detection If the temperature deviates relatively significantly from the target set temperature, the actual heat dissipation area will be expanded.
It can be roughly divided into step I (Fig. 9) and step 10, water level rise control in the capacitor (Fig. 10).

First, as mentioned above, we will explain the case where the detected temperature in the warm-up control m (GS+ figure) is "set temperature + 2.0°C (α)" and the control loop is proceeded to and the determination is not made. Step 51 in Figure 7. In step 52, the cooling fan 14 is turned on, and since the upper limit temperature in step 7 has already been exceeded [set temperature + 2.0°C (α, )], immediately enter the wX9■ condenser water level lowering side.

To control this water level drop in the condenser, the liquid phase refrigerant in the condenser 3 is transferred to the refrigerant supply pump 4 to the Eli II reservoir tank 21.
Step 61. Step 62) lowers the liquid level inside the capacitor 3 to increase the heat dissipation ability, and its discharge is performed when the detected temperature is "set temperature + 1.0 °C (
α)” (step 67)
), and finally the system is sealed (Stella 768). In addition to the above end temperature, the upper limit temperature of step 7 [set temperature + 2.0°C (
α＠)] and the lower limit temperature [set temperature -4.0℃ (α4)], and set slightly higher than the set temperature, this will improve the responsiveness of temperature changes to the drop in liquid level. Considering &4. However, even during the refrigerant discharge, the refrigerant continues to boil in the water jacket 2, so the liquid level gradually decreases, but if the liquid level on the water jacket side of C falls below the set level, then vc is @2 solenoid valve 1
6 is temporarily switched to "flow path B" to supply liquid phase refrigerant from the condenser 3 to the water jacket 2 (step 63).
~65), maintain the IEI liquid level sensor 32 at the set level. In addition, even if the liquid level in the capacitor 3 is lowered to the maximum, insufficient heat dissipation capacity cannot be avoided, and the liquid level sensor 34
If the liquid level drops to the set level T/c, immediately turn on this control to prevent steam from escaping.
(Step 66). The same reason vh When the liquid level inside the capacitor 3 is at step 8, the liquid level is @2 and the sensor 3
If the water level is below the set level in step 4, the water level reduction system in the capacitor is not performed.

On the other hand, as mentioned above, the liquid level in the condenser 3 is controlled at the appropriate time, and the amount of heat generated by the engine and the amount of heat dissipated from the condenser 3 are approximately balanced at their boiling point, and the system is sealed, and after t. The fan control example (step 5) shown in Fig. 7 and the constant liquid level control (step 6) shown in Fig. 8 are repeated. "Set temperature 5℃ (α, )" and "Set temperature -0.5℃ (α1
)” (step 52) so as to maintain the cooling fan 14 only? 0N-OFF system (steps 52, 53
)do. As a reminder, if the liquid level in the water jacket 2 falls below the set level during the liquid level control described above, replenish liquid phase cooling @ gold from the condenser 3 side to the water jacket 2 to maintain the liquid level at the set level. (step 54)
~56),.

The system temperature may fall below the lower limit temperature of step 7 [set temperature -4.0°C (α4)] due to disturbances such as an increase in fresh air running on both sides of f5M or changes in the set temperature itself due to changes in operating conditions. At 7tj'4,! As shown in Figure 10, is the water level in the capacitor rising? -Start. Then, the liquid phase refrigerant in the reservoir tank 21 is forced to be introduced into the gold condenser 3 side by driving the refrigerant supply pump 4 in the reverse direction.Steps 71 and 73
) is a control that raises the liquid level in the capacitor 3 and suppresses the heat dissipation ability. This refrigerant introduction continues until the detected temperature rises to "set temperature - 2.0°C (α,)" (step 75), and at the time of temperature recovery, the system is sealed (
Step 76) and end at the above end temperature ζ, or ζ
Considering the responsiveness of temperature changes to the rise in the liquid level, 017j, if there is a shortage of liquid phase refrigerant in the water jacket 2 during this refrigerant introduction, σ,! Temporarily switch the magnetic valve 16 to "flow path B" and open the refrigerant supply cylinder 14t.
? Drives in the forward direction and replenishes refrigerant from the condenser 3 to the water jacket 2 (Stella 172, 74)
.

As a result of the water level rise in the capacitor described above, the system temperature is guided from the upper limit temperature to the lower limit temperature in step 7, and after t, the above-mentioned fcI? Only the cooling fan 14 is temperature controlled by IC (steps 51 to 53).

In this way, the system temperature is always set to ``set temperature +2.0℃'' and ``set temperature -4.0℃'' to control the liquid in the capacitor 3.
(Step 7).For example, even if the set temperature changes sharply due to a sudden change in operating conditions, the heat dissipation capacity of the capacitor 3 can be changed quickly and over a wide range. At the same time, the change in condensation amount caused by this immediately suppresses boiling of the refrigerant on the water jacket 2 side.
Since it has an accelerating effect, it is possible to follow the set temperature extremely well. Then, the cooling fan 140 system is operated to bring the system temperature t - further within the range of "set temperature ±0.5T:J" (step 51), thereby increasing the responsiveness at a higher n1 degree. Good temperature control is achieved.

Next, FIG. 11 shows the key OF in step 12, which is activated when the ignition key of the engine is operated in 011, and the interrupt processing
F control is fully shown.

First of all, the set temperature t? Set to 80℃ (Stella'
782) By doing so, the above-mentioned constant water level drop control in the condenser is carried out, the heat dissipation capacity of the condenser 3 is utilized to the maximum, and the cooling fan 14vc is
Forced cooling (Steps 51, 52) accelerates the VC process temperature drop, and the system temperature drops to 80°C (Step 81). The system becomes under negative pressure (Step 83). Alternatively, it is assumed that a certain period of time (for example, 60 seconds) has elapsed (Stella 784) 'Th condition is 'power supply k OFF C step 85). This power supply OF'FiC, j: 17 is a normally open type solenoid valve 25, and as the temperature in the system decreases, that is, the pressure decreases, air is discharged from the reservoir tank 21 via the air discharge passage 24. Liquid phase refrigerant is naturally introduced, and finally the entire ζ system is filled with liquid phase refrigerant and becomes ready for the next start-up.VC. This prevents damage to seals and the like due to negative pressure in the system and prevents air from entering while the engine is stopped.

Effects of the Invention As is clear from the above explanation, boiling cooling of an internal combustion engine according to this invention! ! By forcibly raising and lowering the refrigerant liquid level in the condenser during injection, it is possible to quickly make the system temperature follow the target temperature without being affected by disturbances such as the wind when the vehicle is running, and the fuel It is possible to achieve highly accurate temperature control that takes into account the consumption rate and @Seki output, etc. It is possible to completely forcibly introduce liquid phase refrigerant into the system and exhaust air, 1! By pushing the air out through the L path, air can be reliably removed from the system, and the heat dissipation capacity of the capacitor can be maximized. Moreover, since the introduction and discharge of refrigerant during temperature determination and the introduction of refrigerant during air discharge are all performed by a single refrigerant supply pump IC, the configuration is extremely simple.

[BRIEF DESCRIPTION OF THE DRAWINGS] An embodiment of the present invention is shown in Figure 1. 8Figure 1
．． Drawing 9 and Drawing 10 and Drawing 11 are flowcharts showing the same side fall on the implementation side. 1... Internal combustion engine, 2... Water jacket, 3...
...Condenser, 4...Refrigerant supply pump, 13...
Lower tank, 14... Cooling fan, 15... Refrigerant circulation passage, 16... Second solenoid valve, 21... Reservoir tank, 23... Auxiliary refrigerant passage, 24... Air discharge passage, 25 . . . first direct magnetic valve, 31 . . . control a device, 32
...first liquid sensor, 33...temperature sensor, 34.
...Second liquid level sensor, 35...Negative pressure switch 0 Fig. 2 Fig. 3 Fig. 4 Fig. 6 Fig. 7 Fig. 9 Fig. 10 Fig. 11

Claims (1)

[Claims] (1) A water jacket in which liquid phase refrigerant is stored, and refrigerant vapor generated in this water jacket are introduced,
and for a closed refrigerant circulation system consisting of a condenser in which condensed liquid refrigerant is stored in the lower part, a refrigerant circulation passage communicating the lower part of the condenser with the water jacket, and the water jacket, the condenser, and the refrigerant circulation passage. , a reservoir tank provided on the outside thereof, and an auxiliary refrigerant passage whose one end is connected to the refrigerant circulation passage and whose other end is connected to the reservoir tank, and is configured to be able to feed in both forward and reverse directions, and A refrigerant supply pump interposed between the condenser of the refrigerant circulation passage and the auxiliary refrigerant passage connection part, and a refrigerant supply pump disposed at the connection part of both passages, and the refrigerant supply pump is selected as the water jacket or the reservoir tank. an air discharge passage having one end connected to the top of the refrigerant circulation system and equipped with an on-off valve, and a liquid for detecting the liquid level position of the liquid phase refrigerant in the water jacket. surface detection means, temperature detection means for directly or indirectly detecting the refrigerant temperature in the water jacket, and a control device for controlling the refrigerant supply pump, flow path switching mechanism, and on-off valve according to a predetermined program. Boiling cooling system for internal combustion engines.