JPH1071839A - Cooling water circuit for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To store cooling water of high temperature in a heat storage tank without being affected by engine speed. SOLUTION: When the engine load is a prescribed value or less, the calorie to be given to a temperature sensing part 13a of a thermostat 13 is reduced to keep the temperature of the cooling water around 100 deg.C. When the engine load exceeds the prescribed value, the calorie to be given to the temperature sensing part 13a is increased to keep the temperature of the cooling water around 80 deg.C. When the engine load is the prescribed value or less and the temperature reaches the value (about 105 deg.C) when the thermostat is started to open, an electric pump 15 is operated to rapidly store the cooling water of high temperature in a heat storage tank 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a heat storage tank for storing heat of a water-cooled internal combustion engine (hereinafter referred to as an engine), and uses the heat stored in the heat storage tank to promote warm-up of the engine. Alternatively, the present invention relates to a cooling water circuit of an internal combustion engine that achieves immediate heating.

[0002]

2. Description of the Related Art As described above, a cooling water circuit of an internal combustion engine uses the heat stored in a heat storage tank to promote warming-up of the engine or to quickly heat the engine. It is necessary to inject high-temperature cooling water into the inside. To meet this need, Japanese Patent Laid-Open No. 7-2571
In Patent Publication No. 54, the heat storage tank and the engine are connected,
When the temperature of the cooling water discharged from the engine becomes equal to or higher than a predetermined value, the cooling water from the engine is guided into the heat storage tank.

[0003]

In the above-mentioned publication, the cooling water is circulated by a water pump which rotates by obtaining driving force from the engine. Therefore, the amount of circulating cooling water depends on the engine speed. fluctuate. For this reason, even when the cooling water temperature has risen to a predetermined value or more, a sufficient amount of cooling water cannot be injected into the heat storage tank when the engine speed is low.

In view of the above, it is an object of the present invention to store high-temperature cooling water in a heat storage tank without being affected by the engine speed.

[0005]

The present invention uses the following technical means to achieve the above object. Claim 1
According to the invention described in Item 3, when the temperature of the cooling water at which the temperature-sensitive operation valve (13) starts to open reaches the temperature of the cooling water, the electric pump is operated to transfer the cooling water discharged from the water-cooled internal combustion engine (1) to the heat storage tank (4). It is characterized by being fed toward

When the temperature-sensitive operating valve (13) at which the cooling water temperature becomes the highest starts to open, the cooling water is pumped toward the heat storage tank (4) by the electric pump. The heat can be quickly stored in the heat storage tank (4) without being affected by the rotation speed of the internal combustion engine (1). In the invention according to the second aspect, first, the temperature-sensitive operating section (13) is operated in accordance with a decrease in the load of the water-cooled internal combustion engine (1).
The load response control means (18, 23, 26) for increasing the cooling water temperature at which the temperature-sensitive operation valve (13) starts to open by reducing the amount of heat given to the temperature-sensitive water channel (10).
Install in 1). Second, when the load of the water-cooled internal combustion engine (1) reaches a cooling water temperature at which the temperature-sensitive operating valve (13) starts to open with the load being equal to or lower than a predetermined value, the electric pump (15) is operated to operate the water-cooled internal combustion engine. The cooling water discharged from the engine (1) is pumped toward the heat storage tank (4).

First, the cooling water temperature is maintained at a high temperature by reducing the amount of heat applied to the temperature-sensitive operating section (13a) in accordance with the decrease in the load on the water-cooled internal combustion engine (1). Second, when the coolant temperature is maintained at a high temperature, the coolant is quickly stored in the heat storage tank (4) by the electric pump (15), so that the higher temperature coolant is stored in the heat storage tank (4). Can be stored inside.

According to the third aspect of the invention, the electric pump is stopped when the amount of cooling water pumped toward the heat storage tank (4) by the electric pump (15) exceeds the capacity of the heat storage tank (4). It is characterized by the following. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; (Embodiment) FIG. 1 shows a water-cooled internal combustion engine for a vehicle (hereinafter, referred to as a “vehicle”).
Call it engine. ) 1 cooling water circuit and engine 1
1 shows a heating cooling water circuit of an air conditioner that heats a vehicle interior using the cooling water as a heat source. 2 is a radiator for cooling the cooling water flowing out of the engine 1 and 3 is an engine 1
And a water pump (mechanical pump) that draws cooling water flowing out of the engine 1 by obtaining a driving force from the engine 1 and sends it to the engine 1 under pressure.

Reference numeral 4 denotes a heat storage tank having a double tank structure for keeping the cooling water warm and stored (detailed structure will be described later). 5
Is a heater core for heating air using cooling water as a heat source, and the heater core 5 is disposed in an air-conditioning casing 6 forming a flow path of air blown into the vehicle interior. A blower 7 is provided on the air upstream side of the air conditioning casing 6, and a well-known evaporator (evaporator) 8 serving as an air cooling means is provided between the blower 7 and the heater core 5. I have. In the present embodiment, a so-called reheat type air conditioner that adjusts the temperature of the air blown into the vehicle interior according to the flow rate and the amount of air blown through the heater core 5 is employed.

Reference numeral 9 denotes an intake heat exchanger for exchanging heat between the air taken into the engine 1 and the cooling water. The intake heat exchanger 9 is a surge tank 1 for removing pulsation of the intake air.
It is arranged in 0. Reference numeral 11 denotes an A / that exchanges heat between the cooling water flowing out of the engine 1 and transmission oil of an automatic transmission (automatic transmission for a vehicle).
A T heat exchanger 12 is an E / O heat exchanger that exchanges heat between the cooling water flowing out of the engine 1 and the engine oil.

Numeral 100 denotes a radiator channel for returning the cooling water flowing out of the engine 1 to the engine 1 via the radiator 2, and 101 denotes a bypass channel for returning the cooling water flowing out of the engine 1 to the engine 1 by bypassing the radiator 2. (Thermosensitive waterway). This bypass waterway 101
Is connected to the radiator waterway 100 at the cooling water outlet side of the radiator 2 in the radiator waterway 100, and a known thermostat (temperature-sensitive operation) that opens and closes a valve body in accordance with the cooling water temperature is provided at the junction 100a. A valve 13 is provided.

Then, the cooling water flowing through the bypass water passage 101 of the junction 100a is supplied to the temperature-sensitive operating portion (wax box filled with a wax material) 13a of the thermostat 13 (see FIG. 4). It is connected to the junction 100a so as to be guided. Since the thermostat 13 has the valve body of the thermostat 13 disposed at a position closer to the radiator 2 than the junction 100a and opens and closes the radiator waterway 100, even if the thermostat 13 is closed, the bypass waterway can be used. 1
01 is communicable.

In FIG. 1, reference numeral 104 designates cooling water flowing out of the heat storage tank 4 as the heater core 5, the intake heat exchanger 9, and the A / A
A heater channel for returning the heat to the engine 1 through the T heat exchanger 11 and the E / O heat exchanger 12, and 105 for cooling water flowing out of the heat storage tank 4 by bypassing the heater core 5 and the intake heat exchanger 9. / T is a heater bypass water channel that is guided to the inlet side of the heat exchanger 11.

Reference numeral 102 denotes a tank outflow channel that guides cooling water in the heat storage tank 4 to the engine 1, and reference numeral 103 denotes a tank inflow channel that branches from the radiator channel 100 and guides cooling water to the heat storage tank 4. A check valve 14 for preventing cooling water from flowing from the inflow side of the heat storage tank 4 to the branch portion between the radiator waterway 100 and the tank inflow waterway 103 is provided in the tank inflow waterway 103,
The cooling water 103a that bypasses the check valve 14 and guides the cooling water to the heat storage tank 4 is provided with an electric pump 15 that receives electric power from a battery (not shown) and is driven.

A flow control valve 16 for controlling the amount of cooling water flowing through the heater core 5 is provided at a branch point between the H / O heat exchanger water passage 104 and the heater bypass water passage 105. Reference numeral 16 is driven by an actuator 17 such as a servomotor. The actuator 17, the electric pump 15, and a cooling water control valve 24, which will be described later, are controlled by a control device 18 as shown in FIG. Water temperature sensor 19 for detecting
A water temperature sensor 20 for detecting the temperature of the cooling water flowing through the heater water passage 104, and a water temperature sensor 2 for detecting the temperature of the cooling water immediately after the engine flows out (or the temperature of the cooling water in the engine 1).
1. An air conditioner sensor 22 for detecting information necessary for controlling an air conditioner such as an outside temperature sensor or a room temperature sensor, and a pressure sensor 2 for electrically detecting a negative suction pressure of the engine 1.
3, and a signal from an ignition switch 24 for detecting the operating state of the engine 1 is input.

The water temperature sensors 19, 20, and 21 are of the thermistor type having excellent responsiveness (the time constant is about 1 to 2 seconds). Incidentally, reference numeral 25 denotes an immediate effect heating switch that conducts heating by guiding high-temperature cooling water in the heat storage tank 4 to the heater core 5 when the cooling water temperature is low immediately after the start of the engine 1 and the heating operation cannot be performed. The quick-action heating switch 25 is turned on by a manual operation of an occupant.

In FIG. 1, reference numeral 26 denotes a cooling water control valve for switching the cooling water passage in accordance with the cooling water temperature and the operating state of the engine 1 and for adjusting the amount of cooling water flowing through the bypass water passage 101. The control valve 26 is driven by an actuator 25 such as a servomotor. FIG. 3 is a sectional view showing a state where the cooling water control valve 26 is assembled to the heat storage tank 4. The heat storage tank 4 is composed of an inner tank 41 and an outer tank 42 made of a material having excellent corrosion resistance such as stainless steel.
And a substantially vacuum heat insulating layer 43 to improve heat insulating properties.
Are formed. In FIG. 3, hatching indicating a cross section is omitted because the thickness of the inner tank 41 and the outer tank 42 is thin.

Further, below the heat storage tank 4 in the direction of gravity,
A tubular projection 44 projecting downward in the direction of gravity is formed, and an open flow path 45 through which cooling water flows in and out is formed at a tip end portion of the tubular projection 44. And
A water intake pipe (not shown) that opens in a portion of the heat storage tank 4 on the upper side in the gravitational direction in the open flow channel 45, and guides cooling water in the heat storage tank 4 to the outside of the heat storage tank 4. 46
Are arranged concentrically with the opening flow path 45, and the space between the intake pipe 46 and the opening flow path 45 forms an inflow path 47 that guides the cooling water discharged from the engine 1 into the heat storage tank 4. doing.

Reference numeral 261 denotes a housing of the cooling water control valve 26. The housing 261 is formed of a resin such as nylon 66 which is excellent in formability and heat insulation. The housing 261 covers the entirety of the tubular protrusion 44 of the heat storage tank 4 from the outside to prevent heat radiation from the tubular protrusion 44. 262 is located in the vicinity of the open flow channel 45 and the open flow channel 45 and each of the cooling water passages 101 and 10.
2, 103 switching opening and closing, and bypass waterway 101
This is a rotary control valve body of the cooling water control valve 26 for adjusting the flow rate of the cooling water. The control valve body 262 is formed in a substantially cylindrical shape, and as shown in FIG. It is arranged rotatably with its center aligned. And
As shown in FIG. 4, the control valve body 262 is driven to rotate from the actuator 25 via a speed reduction mechanism including a worm 251, a worm wheel 252, a spur gear 253, and a sector gear 254.

Incidentally, reference numeral 263 denotes a sealing member made of a fluororesin which seals a gap between the control valve body 262 and the housing 261, and 264 denotes an O-ring made of nitrile rubber. Numeral 48 denotes a disk-shaped mixing prevention plate for suppressing the mixing of the cooling water flowing into the heat storage tank 4 and the cooling water staying in the heat storage tank 4. A large number of through holes 48a to be circulated are formed.

Next, the operation of this embodiment will be described. 1. Cooling water heat retaining mode (during engine 1 stop) When it is determined from the signal from the ignition switch 24 that the engine 1 has stopped, the open flow passage 45 is closed. As a result, the inside and outside of the heat storage tank 4 are shut off, so that the cooling water stored in the heat storage tank 4
(See FIGS. 1 and 4).

When the engine 1 is stopped irrespective of the cooling water temperature and the turning on of the immediate effect heating switch 23,
The control device 18 switches the cooling water control valve 26 to the cooling water warming mode. 2. Engine warm-up promotion mode When the engine 1 is started, the open flow passage 45 is opened to allow the low-temperature cooling water flowing out of the engine 1 to flow into the heat storage tank 4, and the high-temperature cooling water stored in the heat storage tank 4 is It is led to the engine 1 through the tank water channel 102. Thus, the high-temperature cooling water stored in the heat storage tank 4 circulates in the engine 1 to promote the warm-up operation of the engine 1 (see FIGS. 5 and 6).

3. Immediate heating mode After the engine 1 is started, when the immediate heating switch 23 is turned on, the controller 18 switches the cooling water control valve 26 to the engine warm-up promotion mode. Thereby, the high-temperature cooling water stored in the heat storage tank 4 is
And flows to the heater core 5 to effect immediate heating (see FIGS. 7 and 8).

4. Cold water holding mode In the engine warm-up promotion mode, when the temperature T _{W1 of the} cooling water flowing out of the heat storage tank 4 (the value detected by the water temperature sensor 19) falls below the first predetermined temperature, the bypass water passage 101 and the open flow passage 45. Is closed, and the cooling water flowing out of the engine 1 is directly returned to the engine 1 by bypassing the heat storage tank 4 (see FIGS. 9 and 10).

The first predetermined temperature is appropriately determined based on the heat retaining capacity of the heat storage tank 4, the minimum outside air temperature, and the like, and is set to about 30 ° C. in the present embodiment. 5. Heat storage mode A The warm-up operation is performed when the temperature T _{W2 of the} cooling water flowing out of the engine 1 (the value detected by the water temperature sensor 19) in the cold water holding mode reaches the second predetermined temperature (about 80 ° C. in the present embodiment). Is completed, and the open channel 45 is opened. Further, the absolute value of the intake negative pressure P _in the engine 1 is 35mmHg
Is exceeded, the bypass waterway 101 (101
The amount of cooling water flowing through a) is reduced (see FIGS. 11 and 12).

Thus, the cooling water flowing out of the engine 1 flows through the bypass water passage 101, the heater core 5, and the heat storage tank 4. Therefore, in the heat storage tank 4,
High temperature cooling water is stored. On the other hand, the bypass waterway 101
, A small amount of cooling water circulates.
The temperature of the cooling water is maintained at about 100 ° C. because the temperature-sensitive operation of the third temperature-sensitive operating part 13a becomes slow.

6. In the heat storage mode B, when the temperature T _{W2 of the} cooling water flowing out of the engine 1 in the cold water holding mode reaches the second predetermined temperature, it is considered that the warm-up operation has been completed, and the open flow passage 45 is opened. Further, the absolute value of the intake negative pressure P _in the engine 1 is Willing below 35 mm Hg, the amount of cooling water to the maximum flowing through the bypass passage 101 (101a) (see FIGS. 13 and 14).

Thus, the cooling water flowing out of the engine 1 flows through the bypass water passage 101, the heater core 5, and the heat storage tank 4. Therefore, in the heat storage tank 4,
High temperature cooling water is stored. On the other hand, the bypass waterway 101
Since a large amount of cooling water flows through the
And the cooling water temperature is maintained at about 80 ° C.

As is apparent from the above description of the operation of the heat storage modes A and B, the control device 18 and the pressure sensor 23
The cooling water control valve 26 constitutes a load response control means for controlling the cooling water temperature at which the thermostat 13 starts to open. The heat storage mode A or the heat storage mode B
To be one of the threshold values to 35 mm Hg (absolute value of the intake negative pressure P _in) is, as is well known, since it is an index indicating the magnitude of the engine load is not limited to 35 mm Hg, engine displacement Ya It is appropriately determined by the output characteristics of the engine 1 and the like.

7. Heat storage mode C In the heat storage mode A, it is considered that the thermostat 13 has started to open when the temperature T _{W3 of the} cooling water discharged from the engine 1 (the value detected by the water temperature sensor 21) reaches the third predetermined temperature. Then, the cooling water control valve 26 is switched to the engine warm-up promotion mode and the electric pump 15 is operated.
As a result, the cooling water is pressure-fed into the heat storage tank 4 by the electric pump 15, so that the high-temperature cooling water discharged from the engine 1 is quickly stored in the heat storage tank 4.

When a predetermined time t _{1 has} elapsed after the operation of the electric pump 15, the amount of cooling water pumped toward the heat storage tank 4 by the electric pump 15 is equal to the volume of the heat storage tank 4 (in this embodiment, about 3000 cc), the cooling water control valve 26 is switched to the heat storage mode A, and the electric pump 15 is stopped. This allows the cooling water discharged from the engine 1 to flow to the radiator 2 again, thereby preventing the temperature of the engine 1 (cooling water) from excessively rising and preventing the engine 1 from burning.

Since the third predetermined temperature corresponds to the cooling water temperature at which the thermostat 13 starts to open as described above, the response speed of the thermostat 13 and the position where the thermostat 13 is provided and the water temperature sensor The temperature is appropriately determined depending on the location of the 21 and the like, and is about 105 ° C. in the present embodiment. Also,
A predetermined time t ₁ The volume of the heat storage tank 4 and the electric pump 15
It is appropriately determined according to the capability of the system, and is about 30 seconds in the present embodiment.

Incidentally, the bypass water passage 101 is opened only in the heat storage modes A, B, and C. In the cooling water warming mode, the engine warm-up promotion mode (immediate effect heating mode), and the cold water holding mode, the bypass water passage 101 is opened. It is closed. FIGS. 15 and 16 are flowcharts showing the operation of the cooling water control valve 26 and the electric pump 15 corresponding to each of the above modes. The flowcharts will be described below.

It is determined from the ignition switch 22 whether the engine 1 is operating (step 100).
When it is determined that the engine is in operation, the temperature T of the cooling water immediately after the outflow of the engine is detected by the water temperature sensor 19a.
It is determined whether _{W 0} is 80 ° C. or higher (step 10).
5) On the other hand, when it is determined that the vehicle is stopped, the cooling water warming mode is set (step 220).

When it is determined that the temperature T _{W 0} of the cooling water is 80 ° C. or higher, a heat storage mode is set (step 200), and it is determined that the temperature T _{W 0} of the cooling water is lower than 80 ° C. At this time, the engine warm-up promotion mode is set (step 110). Next, it is determined whether or not the immediate heating switch 23 is turned on (step 120). When it is determined that the immediate heating switch 23 is turned on, the immediate heating mode is set (step 130). On the other hand, when it is determined that the immediate effect heating switch 23 is not turned on,
It is determined whether the temperature T _{W1 of the} cooling water is equal to or higher than 30 ° C. (Step 140), and if it is determined that the temperature T _{W1 of the} cooling water is lower than 30 ° C., the cooling water holding mode is set ( Step 150). Meanwhile, when the temperature T _{W 1} of the cooling water is determined to be 30 ° C. or higher, the temperature T _{W 1} of the cooling water is 3
The engine warm-up promotion mode is set until the temperature becomes lower than 0 ° C. (steps 160 and 170).

[0037] Then, when the temperature T _{W 1} of the cooling water is determined to be less than 30 ° C., the temperature T _{W 2} of the cooling water is 80
The cooling water holding mode is set until the temperature becomes equal to or higher than
0,190), when the temperature T _{W 2} of the cooling water becomes 80 ° C. or higher, the absolute value of the intake negative pressure P _in the engine 1 is 35m
It is determined whether the pressure is greater than mHg (step 20).
0).

Next, the absolute value of the intake negative pressure P _in the 35mmH
When it is determined to be less than g is the heat storage mode B (step 210), the absolute value of the intake negative pressure P _in the 35mmHg
When it is determined that the value is larger than the predetermined value, the heat storage mode A is set (step 220). And the temperature T _{W3 of the} cooling water is 105
It is determined whether or not the temperature is not lower than C. (Step 230). If it is determined that the cooling water temperature T _W3 is not less than 105 ° C., the heat storage mode C is set until the predetermined time t ₁ elapses (Step 240). 290).

Next, the heat storage mode A, the heat storage mode B or the heat storage mode C is maintained until the engine 1 is stopped (step 300), and the cooling water warming mode is set when the engine 1 is stopped (step 310). Next, features of the present embodiment will be described. According to the present embodiment, when the engine 1 is stopped, the opening channel 45 is closed to shut off the inside and outside of the heat storage tank 4, so that the cooling water stored in the heat storage tank 4 is held in the heat storage tank 4. You. Thereby, while the engine 1 is stopped, convection between the cooling water in the portion other than the heat storage tank 4 (for example, a pipe connected to the heat storage tank 4) and the cooling water in the heat storage tank 4 can be prevented. Therefore, it is possible to prevent the cooling water in the portion other than the heat storage tank 4 from being mixed with the cooling water in the heat storage tank 4, so that the heat storage capacity of the heat storage tank 4 can be improved.

Further, the control valve element 26 for closing the opening flow path 45
2 is located near the opening channel 45 of the heat storage tank 4, so that the mixing of the cooling water of the portion other than the heat storage tank 4 and the cooling water of the heat storage tank 4 can be more reliably prevented. As a result, the heat storage capacity of the heat storage tank 4 can be further improved. By the way, in the engine warm-up promotion mode, the low-temperature cooling water remaining in the engine 1 flows into the heat storage tank 4 when the engine 1 starts, and the high-temperature cooling water stored in the heat storage tank 4 is Flow into However, if all of the high-temperature cooling water stored in the heat storage tank 4 flows out, the engine 1
The low-temperature cooling water discharged from the engine 1 flows back to the engine 1, and the temperature of the cooling water in the engine 1 decreases, and on the contrary, the warm-up operation is delayed.

[0041] In contrast, in the present embodiment, when the temperature T _{W 1} of the cooling water flowing out from the thermal storage tank 4 is below a first predetermined temperature, bypass the heat storage tank 4 the cooling water flowing out from the engine 1 As a result, the cooling water discharged from the engine 1 immediately after the start of the engine is held in the heat storage tank 4 to prevent the cooling water from flowing back to the engine 1.

Therefore, since a delay in the warm-up operation can be prevented, the amount of harmful substances (exhaust emissions) released into the atmosphere during the warm-up operation can be reduced, and the fuel efficiency can be improved. Can be. In the engine warm-up promotion mode, since the bypass water passage 101 is closed, it is possible to prevent the low-temperature cooling water discharged from the engine 1 immediately after the start of the engine from returning to the engine 1. Therefore, the warm-up operation of the engine 1 can be sufficiently promoted by the high-temperature cooling water stored in the heat storage tank 4.

Further, the open flow passage 45 and each cooling water passage 10
1, 102, 103 switching open / close and bypass waterway 10
Since the one flow control is performed by one control valve element 262, the size can be reduced as the number of parts is reduced as compared with the case where the switching valve mechanism and the flow control valve mechanism are each performed by independent valve means. It is possible to improve the mountability (assembly) of the cooling water circuit according to the present embodiment in a vehicle, as well as to achieve the improvement.

Further, by closing the bypass water passage 101 in the engine warm-up promotion mode, the immediate effect heating mode, and the cold water holding mode, the bypass water passage 101 is closed during the warm-up operation. load is increased (the absolute value of the intake negative pressure P _in is reduced), different from the one for controlling the amount of cooling water flowing through the mechanical bypass passage 101 by intake negative pressure, the cooling water of the low-temperature discharged from the engine 1 is bypassed It is possible to prevent a large amount of water from flowing back to the engine 1 through the water channel 101. Therefore, the warm-up operation of the engine 1 can be further promoted. By the way, the cooling water temperature is thermostat 1
3 is highest when it begins to open. According to the present embodiment, the temperature T _{W 3 of} the cooling water discharged from the engine 1 is determined.
When the temperature reaches 105 ° C., it is considered that the thermostat 13 has begun to open, and the cooling water control valve 26 is switched to the engine warm-up promotion mode to operate the electric pump 15. Without this, high-temperature cooling water can be quickly stored in the heat storage tank 4.
Therefore, the warm-up of the engine can be effectively promoted or the immediate heating can be effectively performed at the next engine start.

[0045] In the present embodiment, as described above, the cooling water temperature when the load of the engine 1 is small (when the absolute value of the intake negative pressure P _in the engine 1 is greater than the 35 mm Hg) to about 100 ° C. is maintained, the absolute value of the intake negative pressure P _in when the load of the engine 1 is large (the engine 1 is 3
(At 5 mmHg or less) cooling water temperature is maintained at about 80 ° C. In the present embodiment, when the load on the engine 1 is small and the temperature of the cooling water is high, the electric pump 15 is operated to actively store the cooling water in the heat storage tank 4. Can be stored in the heat storage tank 4.

In the above embodiment, the cooling water control valve 26 is connected to the bypass water passage 10 according to the load of the engine 1.
Although a mechanism for controlling the amount of cooling water flowing through 1 was provided,
The present invention can be implemented even if this mechanism is abolished.
However, in this case, since the temperature of the cooling water is maintained at about 80 ° C., it is desirable that the temperature T _{W3 of the} cooling water be about 90 ° C.

In the above embodiment, the heat storage tank 4
Although accumulated heat of the cooling water by storing hot coolant within, CH ₃ COONa, may be used heat storage tank consisting of Ba (OH) ₂ -8H ₂ O or the like latent heat storage material. Further, in the above-described embodiment, the present invention is applied to a vehicle having a reheat type air conditioner. However, the present invention adjusts the ratio between the amount of air flowing through the heater core 5 and the amount of air bypassing the heater core 5 so that the inside of the vehicle can be adjusted. Adjust the temperature of the air to blow out,
The invention can also be applied to a vehicle having a so-called air-mix type air conditioner.

The present invention can also be applied to a so-called hybrid vehicle which travels by using the engine 1 and the traveling electric motor together.

[Brief description of the drawings]

FIG. 1 is a cooling water circuit diagram (cooling water heat retaining mode) according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control system according to the embodiment.

FIG. 3 is a cross-sectional view showing a state where a cooling water control valve is assembled to a heat storage tank.

FIG. 4 is a sectional view taken along line AA of FIG. 1 (cooling water warming mode).

FIG. 5 is a coolant circuit diagram showing a coolant flow in an engine warm-up promotion mode.

FIG. 6 is a sectional view taken along line AA of FIG. 1 showing an engine warm-up promotion mode.

FIG. 7 is a cooling water circuit diagram showing the flow of cooling water in an immediate heating mode.

FIG. 8 is a sectional view taken along line AA of FIG. 1 showing an immediate effect heating mode.

FIG. 9 is a cooling water circuit diagram showing a flow of cooling water in a cold water holding mode.

FIG. 10 is a sectional view taken along the line AA of FIG. 1 showing a cold water holding mode.

FIG. 11 is a cooling water circuit diagram showing a flow of cooling water in a heat storage mode A.

FIG. 12 is a sectional view taken along the line AA of FIG.

FIG. 13 is a cooling water circuit diagram showing the flow of cooling water in a heat storage mode B.

FIG. 14 is a sectional view taken along the line AA of FIG. 1 showing a heat storage mode B;

FIG. 15 is a flowchart showing the operation of the cooling water control valve corresponding to each mode (steps 100 to 190).

FIG. 16 is a flowchart showing the operation of the cooling water control valve corresponding to each mode (steps 200 to 310).

[Explanation of symbols]

1 ... engine (water-cooled internal combustion engine) 2 ... radiator 3
... water pump, 4 ... heat storage tank, 5 ... heater core,
9 ... intake heat exchanger, 11 ... A / T heat exchanger, 12 ... E /
O heat exchanger, 13 ... thermostat (temperature-sensitive operating valve), 1
4 ... check valve, 15 ... electric pump, 100 ... radiator waterway, 101 ... bypass waterway (temperature-sensitive waterway), 261 ... housing, 262 ... control valve body.

Claims (3)

[Claims] 1. A water-cooled internal combustion engine (1), a mechanical pump (3) for obtaining driving force from the water-cooled internal combustion engine (1) and circulating cooling water, and a water-cooled internal combustion engine (1) A cooling water tank (4) for guiding the cooling water to be discharged and storing heat of the cooling water, and a cooling water passage (103a) connecting the water-cooled internal combustion engine (1) and the heat storing tank (4), An electric pump (15) driven by electric power, a radiator (2) for radiating heat of cooling water discharged from the water-cooled internal combustion engine (1), and a cooling water discharged from the water-cooled internal combustion engine (1). A radiator passageway (100) for returning to the water-cooled internal combustion engine (1) via the radiator (2); and a temperature-sensitive operating section that changes in volume according to the temperature of cooling water discharged from the water-cooled internal combustion engine (1). (13a), and the temperature-sensitive operating portion ( 13a) a temperature-sensitive operating valve (13) that opens and closes the radiator water channel (100) according to a volume change, and a temperature detecting means (21) that detects a temperature of cooling water discharged from the water-cooled internal combustion engine (1). A control device (18) for controlling the operation of the electric pump (15) based on the cooling water temperature detected by the temperature detection means (21), wherein the control device (18) When the temperature of the cooling water at which the operating valve (13) starts to open reaches the temperature, the electric pump is operated to pump the cooling water discharged from the water-cooled internal combustion engine (1) toward the heat storage tank (4). A cooling water circuit for an internal combustion engine. 2. A temperature-sensitive water channel (1) for guiding cooling water discharged from said water-cooled internal combustion engine (1) to said temperature-sensitive operating section (13a).
01), and disposed in the temperature-sensitive water channel (101), and in response to a decrease in the load on the water-cooled internal combustion engine (1), the temperature-sensitive operating section (13).
a) a load response control means (18, 23, 26) for increasing the cooling water temperature at which the temperature-sensitive operation valve (13) starts to open by reducing the amount of heat given to the control device (18). ) Is the electric pump (1) when the temperature of the water-cooled internal combustion engine (1) reaches a cooling water temperature at which the temperature-sensitive operation valve (13) starts to open with the load being equal to or less than a predetermined value.
The cooling water circuit for an internal combustion engine according to claim 1, wherein the cooling water discharged from the water-cooled internal combustion engine (1) is operated to pump the cooling water toward the heat storage tank (4). 3. The control device (18), when the amount of cooling water pumped toward the heat storage tank (4) by the electric pump (15) exceeds the volume of the heat storage tank (4). 3. The cooling water circuit for an internal combustion engine according to claim 1, wherein the electric pump is stopped.