JPH1077839A - Cooling water control valve and cooling water circuit for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sufficient warm-up accelerating effect with heat stored in a heat storage tank at the time of warm-up by closing a thermosensitive waterway at the time of leading cooling water, flowing out of the heat storage tank, to a water-cooled internal combustion engine to warm up the water-cooled internal combustion engine. SOLUTION: With the start of an engine, an opening passage is opened to open a warm-up waterway 106, and a first by-pass waterway 101 and a heater waterway 104 are closed. The warm-up waterway 106 and a tank circuit 107 are thereby opened, so that the whole cooling water of high temperature stored in a heat storage tank is circulated in an engine 1 so as to accelerate warm-up of the engine. Immediately after the start of the engine 1, low temperature cooling water discharged from the engine 1 is retained in the heat storage tank 4 so as to be prevented from flowing back to the engine 1. The quantity of harmful matter discharged at the time of warm-up can thereby be reduced, and fuel consumption can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling water circuit for promoting a warm-up operation of a water-cooled internal combustion engine (hereinafter referred to as an engine).

[0002]

2. Description of the Related Art Conventionally, cooling in which a high-temperature cooling water is stored in a heat storage tank having a heat storage structure such as a thermos bottle or the like to promote a warm-up operation by using the high-temperature cooling water in the heat storage tank at the next engine start. A circuit has been proposed.

[0003]

By the way, the inventors examined the prototype of the above-mentioned cooling circuit, and found that although the high-temperature cooling water in the heat storage tank was guided into the engine, the warm-up promoting effect was obtained. Couldn't get enough.
Therefore, when we continued examining that point,
The following points were found.

That is, in addition to the cooling circuit for promoting the warming-up operation, the engine cooling circuit includes a radiator water passage connecting the radiator and the engine and a bypass for bypassing the radiator, as well-known existing cooling circuits. There is a waterway. A well-known thermostat is provided in the radiator water channel, and the thermostat senses the temperature of the cooling water flowing through the bypass water channel and opens and closes the radiator water channel to reduce the cooling water temperature to about 80 ° C. keeping.

[0005] By the way, since the bypass channel is always in communication as is well known, even during warm-up operation when the cooling water temperature is low,
The cooling water discharged from the engine is directly returned to the engine. For this reason, even if high-temperature cooling water is guided from the heat storage tank to the engine, the temperature of the cooling water in the engine does not rise sufficiently, so that a sufficient warming-up promoting effect cannot be obtained.

In view of the above, it is an object of the present invention to provide a cooling circuit having a heat storage tank to obtain a sufficient warming-up promoting effect by heat stored in the heat storage tank during a warm-up operation.

[0007]

The present invention uses the following technical means to achieve the above object. Claim 1
According to the invention described in Item 4, the water-cooled internal combustion engine (1) is provided inside the cooling water control valve through the radiator water channel (100b), the temperature-sensitive operating valve (13), and the temperature-sensitive portion (13a) of the temperature-sensitive operating valve (13). ), A temperature-sensitive water channel (101) connected to the cooling water inflow side is formed. When the cooling water flowing out of the heat storage tank (4) is guided to the water-cooled internal combustion engine (1) to perform a warm-up operation of the water-cooled internal combustion engine (1), the temperature-sensitive water channel (10)
It is characterized in that 1) is closed.

Accordingly, the low-temperature cooling water discharged from the water-cooled internal combustion engine (1) immediately after the start of the water-cooled internal combustion engine (1) is returned to the water-cooled internal combustion engine (1) via the temperature-sensitive water channel (101). Can be prevented. Therefore, the warm-up operation of the water-cooled internal combustion engine (1) can be sufficiently promoted by the high-temperature cooling water stored in the heat storage tank (4).

According to the second aspect of the present invention, when the temperature of the cooling water flowing out of the heat storage tank (4) is equal to or lower than a predetermined temperature, the cooling water flowing out of the heat storage tank (4) is supplied to the water-cooled internal combustion engine (1). The leading warm-up channel (106) is closed. Thereby, since the low-temperature cooling water discharged from the water-cooled internal combustion engine (1) immediately after the start of the water-cooled internal combustion engine (1) is held in the heat storage tank (4), the low-temperature cooling water is supplied to the water-cooled internal combustion engine ( Reflux in 1) can be prevented.

Therefore, it is possible to prevent the delay of the warm-up operation, so that the amount of harmful substances released into the atmosphere during the warm-up operation can be reduced, and the fuel efficiency can be improved. According to the third aspect of the invention, when the water-cooled internal combustion engine (1) is stopped, the tank water passage (107) for guiding the cooling water discharged from the water-cooled internal combustion engine (1) to the heat storage tank (4) is closed. Features.

Thus, while the water-cooled internal combustion engine (1) is stopped, the cooling water and the heat storage tank (4) other than the heat storage tank (4) (for example, pipes connected to the heat storage tank (4)). Convection with the cooling water 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.

According to the fourth aspect of the present invention, the thermosensitive water channel (1)
02), the warm-up channel (106) and the tank channel (1).
07) is opened and closed by one control valve element (262). Claim 5 or 6
In the invention described in (1), when the cooling water flowing out of the heat storage tank (4) is guided to the water-cooled internal combustion engine (1) to perform the warm-up operation of the water-cooled internal combustion engine (1), the water-cooled internal combustion engine (1) ) Through a temperature-sensing section (13a) of a temperature-sensing valve (13) to a water-cooled internal combustion engine (1). A first temperature-sensing water passage (101) is provided by a first valve means (24). It is characterized by closing.

Accordingly, the same operation as the cooling water control valve according to the first aspect is performed, and the same effect as that of the cooling water control valve according to the first aspect can be obtained. In the invention described in claim 6, the first thermosensitive channel (101) passes through the first thermosensitive portion, and the second thermosensitive channel (102) passes through the second thermosensitive portion. When the load of the water-cooled internal combustion engine (1) exceeds a predetermined value, the second thermosensitive water channel (102)
And opening the first temperature-sensitive water channel (101) after the warm-up operation of the water-cooled internal combustion engine (1) is completed.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; (First Embodiment) FIG. 1 shows a cooling water circuit of a water-cooled internal combustion engine (hereinafter, referred to as an engine) 1 for a vehicle, and an air conditioner for heating an interior of a vehicle using the cooling water of the engine 1 as a heat source. 3 shows a cooling water circuit. Reference numeral 2 denotes a radiator that cools the cooling water flowing out of the engine 1, and reference numeral 3 denotes a water pump that draws the cooling water flowing out of the engine 1 by obtaining driving force from the engine 1 and feeds the cooling water to the engine 1.

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. Numerals 101 and 102 detour the cooling water flowing out of the engine 1 to the radiator 2 to thereby prevent the engine 1 from flowing.
First and second bypass channels (first and second temperature-sensitive channels). These two bypass waterways 101 and 102 are
A well-known thermostat (temperature-sensitive operating valve) that joins the radiator waterway 100 at the cooling water outlet side of the radiator 2 in the radiator waterway 100 and opens and closes a valve body in accordance with the temperature of the cooling water. 13 are provided.

The thermostat 13 is connected to the junction 1
Since the radiator water passage 100 is opened and closed by disposing the valve body portion at a position closer to the radiator 2 side than the water passage 00a, even if the thermostat 13 is closed, both bypass water passages 10
1 and 102 can communicate. In addition, the second bypass waterway 102 is the second bypass waterway 1 of the junction 100a.
The cooling water flowing through the thermostat 02 is the temperature sensing part of the thermostat 13 (the wax box filled with the wax material) 1
The junction 3a is connected to the downstream of the temperature sensing portion 13a so as to collide with a predetermined position (hereinafter, referred to as a second temperature sensing portion) (see FIG. 4).

On the other hand, the first bypass water passage 101 is provided with the cooling water flowing through the first bypass water passage 101 and the temperature sensing portion 13.
The portion a is connected to a downstream side of the temperature sensing portion 13a of the junction 100a so as to collide with a position different from the second temperature sensing portion (hereinafter, referred to as a first temperature sensing portion). In the present embodiment, the first temperature sensing portion is a portion on the axial end side of the cylindrical temperature sensing portion 13a, and the second temperature sensing portion is the temperature sensing portion 1
This is a portion on the side of the cylinder 3a (see FIG. 4).

For this reason, both bypass waterways 101 and 102
When the cooling water circulates through the thermostat 1 compared to when the cooling water circulates only through the first bypass water passage 101.
Since the amount of heat per unit time given to the temperature sensing part 3 increases, the valve opening operation of the thermostat 13 becomes sensitive. Therefore, when the cooling water flows through both bypass water passages 101 and 102, the average cooling water temperature can be kept lower than when the cooling water flows only through first bypass water passage 101.

In this embodiment, the average cooling water temperature when the cooling water flows only through the first bypass water passage 101 is set to about 100 ° C.
The thermostat 13 and the bypass water passages 101 and 102 are set so that the average cooling water temperature when the cooling water flows through the first and second cooling water channels 102 and 102 is about 80 ° C. Also, 15
Is a load response valve that opens and closes the second bypass water passage 102 (second
The load response valve 15 detects a negative pressure in a suction pipe (not shown) of the engine 1 as a load on the engine 1 and activates the valve element of the load response valve 15. Specifically, as shown in FIG. 4, the negative pressure fluctuation is mechanically detected by a diaphragm 151, and
The first displacement is applied to the valve body 153 via the connecting rod 152 to open and close the second bypass water passage 102.

In FIG. 1, reference numeral 104 designates cooling water flowing out of the heat storage tank 4 by using 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. 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.

The flow control valve 16 is driven by an actuator 17 such as a servomotor. The actuator 17 is controlled by a controller 18 as shown in FIG.
The controller 18 includes a water temperature sensor (temperature detecting means) 19 for detecting the temperature of the cooling water flowing back to the engine 1, and a water temperature sensor 20 for detecting the temperature of the cooling water flowing through the heater water passage 104. A water temperature sensor 19a for detecting the temperature of the cooling water immediately after the outflow of the engine (or the temperature of the cooling water in the engine 1), and an air conditioning sensor for detecting information necessary for controlling an air conditioner such as a temperature sensor outside the vehicle compartment and a temperature sensor inside the vehicle compartment 21 and a signal from an ignition switch 22 for detecting the operating state of the engine 1. Then, the control device 18 controls the air conditioner such as the actuator 17 and the blower 7 according to a preset program based on the input signal.

The water temperature sensors 19, 19a, 20
It is a thermistor type having excellent response (time constant is about 1 to 2 seconds). Incidentally, when the cooling water temperature is low immediately after the start of the engine 1 and the heating operation cannot be performed, the high-temperature cooling water in the heat storage tank 4 is supplied to the heater core 23.
The heating switch 23 is turned on by a manual operation of an occupant.

Reference numeral 24 denotes a switching valve (first valve means) for switching the cooling water passage according to the temperature of the cooling water and the operating state of the engine 1.
5. Note that this servo motor 2
5 is also controlled by the control device 18 similarly to the flow control valve 16 (see FIG. 2). FIG. 3 is a sectional view showing a state where the switching valve 24 is assembled to the heat storage tank 4. Thermal storage tank 4
As shown in FIG. 3, the inner tank 41 and the outer tank 42 are made of a material having excellent corrosion resistance such as stainless steel. A vacuum heat insulating layer 43 is formed.
In FIG. 3, the inner tank 41 and the outer tank 42
, The hatching indicating the cross section was omitted.

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 switching valve 24. The housing 261 is formed of a resin such as nylon 66 which is excellent in formability and heat insulation. As shown in FIG. 4, the housing 261 covers the entire tubular protrusion 44 of the heat storage tank 4 from the outside to prevent heat radiation from the tubular protrusion 44. 100b has one end connected to the cooling water outflow side of the radiator, the other end connected to the cooling water inflow side of the engine 1, and forms a part of the radiator waterway 100. 101a has one end connected to the engine 1
, And the other end side is connected to the cooling water inflow side of the engine 1 via the second temperature sensing part to form a part of the first bypass water passage 101. Reference numeral 106 denotes a warm-up channel that guides the cooling water flowing out of the heat storage tank 4 to the engine 1, and reference numeral 107 denotes a tank channel that guides the cooling water flowing out of the engine to the heat storage tank 4 (see FIG. 3).

Reference numeral 262 denotes a rotary control valve body of the switching valve 24. The control valve body 262 is formed in a substantially cylindrical shape. As shown in FIG. And are rotatably arranged. Then, the control valve body 262 is rotationally driven from the servo motor 25 via a reduction mechanism including a worm 251, a worm wheel 252, a spur gear 253, and a sector gear 254 (see FIG. 3). Then, as shown in FIG. 3, the control valve element 262 is located near the open flow
5. Opening and closing of the heating water channel 106 and the radiator water channel 100b.

Further, as shown in FIG. 5, the control valve element 262 is provided on each of the side surfaces of the cylinder with the respective water passages 100b and the heating water passages 10b.
The communication ports 262a to 262f for opening and closing 6 and the like are formed, and communication ports 262g and 262h for opening and closing the open flow channel 45 are formed at the axial end. By the way, 26
Reference numeral 3 denotes a sealing member made of a fluororesin that seals a gap between the control valve body 262 and the housing 261. Reference numeral 264 denotes an O-ring made of nitrile rubber. Reference numeral 48 denotes a mixing prevention in which a large number of through holes 48a are formed in a disk-shaped plate and suppresses mixing of cooling water flowing into the heat storage tank 4 and cooling water staying in the heat storage tank 4. It is a board.

Next, the operation of the present embodiment will be described. 1. Cooling water warming mode (during engine 1 stop) When it is determined from the signal from the ignition switch 22 that the engine 1 has stopped, the open flow passage 45 is closed (see FIGS. 1 and 6). Thereby, the warm-up water channel 106 and the tank circuit 107 are closed, so that the heat storage tank 4
The cooling water stored therein is held in the heat storage tank 4.

When the engine 1 is stopped irrespective of the temperature of the cooling water and whether the immediate effect heating switch 23 is turned on,
The switching valve 24 switches the cooling water circuit to this mode. 2. Engine warm-up promotion mode When the engine 1 is started, the opening channel 45 is opened to open the heating channel 106, and the first bypass channel 101 and the heater channel 104 are closed. Thereby, the warm-up water channel 1
06 and the tank circuit 107 are opened, so that all of the high-temperature cooling water stored in the heat storage tank 4
The warm-up operation of the engine 1 is promoted by circulating through the inside (see FIGS. 7 and 8).

3. Immediate-effect heating mode After the engine 1 is started, when the immediate-effect heating switch 23 is turned on, the opening passage 45 and the heater water passage 104 are opened with the first bypass water passage 101 closed. As a result, the warm-up water passage 106 and the tank circuit 107 are opened, so that all of the high-temperature cooling water stored in the heat storage tank 4 flows toward the heater core 5 to achieve immediate heating (see FIGS. 9 and 10). ).

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 first bypass water passage 101
Is closed, the open flow passage 45 (the heating water passage 106 and the tank water passage 107) 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. 11 and 12). .

Incidentally, the first predetermined temperature is set in the heat storage tank 4.
Is determined as appropriate based on the heat retention capacity, the minimum outside air temperature, and the like. In the present embodiment, the temperature is set to about 30 ° C. 5. Heat storage mode 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), the warm-up operation is performed. Has been terminated, the first bypass waterway 101,
Open channel 45 (heating channel 106 and tank channel 10)
7) and open the heater channel 104. As a result, the cooling water flowing out of the engine 1 is supplied to the first bypass water passage 10
1. Flow through the heater core 5 and the heat storage tank 4. Therefore, high-temperature cooling water is stored in the heat storage tank 4 (see FIGS. 4 and 13).

FIGS. 14 and 15 are flowcharts showing the operation of the switching valve 24 corresponding to each of the above modes.
The flowchart will be described below. It is determined from the ignition switch 22 whether or not the engine 1 is operating (step 100). When it is determined that the engine 1 is operating, the temperature T _W of the cooling water immediately after the outflow of the engine detected by the water temperature sensor 19a. It is determined whether or not ₀ is equal to or higher than 80 ° C. (step 105). On the other hand, when it is determined that the engine is stopped, the cooling water warming mode is set (step 2).
50).

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 230), 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).

[0038] 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
C. until the temperature reaches ℃ or more (step 18).
0, 190) and when the temperature T _{W 2} ≧ 80 ° C. or more has continued for a predetermined time (3 minutes in this embodiment), the heat storage mode is set (steps 200 to 230). Next, the heat storage mode is maintained until the engine 1 stops (step 24).
0) When the engine 1 is stopped, the cold water holding mode is set (step 250).

In the flowcharts of FIGS.
Since the temperatures T _W0 and T _W2 are threshold values for determining whether or not the warm-up of the engine 1 has ended (whether or not the engine 1 is warm), the temperatures T _{W 0} and T _{W 2} are necessarily 80 ° C. However, the present invention is not limited to this. Therefore, the temperatures T _{W 0} , T
The value of _{W 2} depends on the type of the engine 1 and the water temperature sensors 19 and 19.
This is a value that should be appropriately selected depending on the location where a is provided.

In steps 200 to 220, it is determined whether or not the state where the temperature T _{W 2} ≧ 80 ° C. or more has been continued for 3 minutes or more because it is determined whether or not the entire engine 1 is completely warmed up. The predetermined time is not limited to three minutes, but is a time that should be appropriately selected in consideration of the size of the engine 1, the total amount of cooling water, and the like.

Next, the features of this embodiment will be described. According to the present embodiment, when the engine 1 is stopped, the warm-up water channel 106 and the tank circuit 107 are closed, so that the parts other than the heat storage tank 4 (for example,
Convection between cooling water in the heat storage tank 4 and cooling water in the heat storage tank 4 can be prevented. Therefore, the cooling water in the portion other than the heat storage tank 4 and the heat storage tank 4
Of the heat storage tank 4 can be improved.

The warm-up water channel 106 and the tank circuit 1
07, the valve body 262 of the switching valve 24 is connected to the heat storage tank 4
, The mixture of the cooling water in the portion other than the heat storage tank 4 and the cooling water in 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 when the engine 1 is started is stored in the heat storage tank 4.
And the high-temperature cooling water stored in the heat storage tank 4 flows into the engine 1. However, when all of the high-temperature cooling water stored in the heat storage tank 4 flows out,
The low-temperature cooling water discharged from the engine 1 immediately after the start of the engine 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.

[0043] 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 the delay of the warm-up operation can be prevented, the amount of harmful substances (exhaust emission) released into the atmosphere during the warm-up operation can be reduced, and the fuel efficiency can be improved. Can be. Incidentally, FIG. 16 shows the results of a test investigation on harmful substances and fuel efficiency. According to the present embodiment, it is clear that harmful substances are reduced by about 15% and fuel efficiency is improved by about 5.1%. Was.
The test conditions are as follows.

In the engine warm-up promotion mode, since the first 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 flowing back 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.

FIG. 17 is a test result showing the warming-up promoting effect of the cooling water circuit according to the present embodiment.
7, a solid line indicates the present embodiment, a dashed line indicates a cooling water circuit according to the related art, and a broken line indicates a so-called ordinary cooling water circuit without the heat storage tank 4. According to the present embodiment, the mixing ratio of the intake air taken into the engine 1 is feedback-controlled in accordance with the engine speed, the throttle opening, and the like. Can be clearly seen.

The test conditions are as follows. Engine displacement: 1600 cc, outside air temperature: 25 ° C., vehicle running mode: LA # 4 (This is a running mode for measuring exhaust gas and fuel efficiency adopted in the United States, Canada and European countries. (Second Embodiment) In the above-described embodiment, in the cold water holding mode, the cooling water flowing out of the engine 1 via the warm-up water channel 106 is bypassed to the heat storage tank 4 and directly to the engine 1.
In the present embodiment, in the cold water holding mode, both the bypass water passages 101 and 102 and the warm-up water passage 1 are used.
All of the water passages including the cooling water discharged from the engine 1 to the outside of the engine 1 including the cooling water 06 are closed.

More specifically, as shown in FIG. 18, a solenoid valve 26 is disposed as a valve means for opening and closing each of the water passages in the warm-up water passage 106 and the second bypass water passage 102, and the cooling water flowing out of the heat storage tank 4 is provided. When the temperature T _W1 falls below the first predetermined temperature, the solenoid valve 26 is closed, assuming that all of the high-temperature cooling water stored in the heat storage tank 4 has flowed out.

As a result, since the cooling water is not discharged to the outside of the engine 1, much of the energy given to the cooling water by the water pump 3 becomes heat energy and raises the temperature of the cooling water. Therefore, the warm-up operation of the engine 1 can be further promoted as compared with the case where the cooling water is circulated between the warm-up water passage 106 and the engine 1. Normally, since the water pump 3 of the engine 1 is a centrifugal pump, all the water passages in which the cooling water is discharged from the engine 1 to the outside of the engine 1 and returns to the inside of the engine 1 may be closed. Further, in this case, a water passage having a large water flow resistance may be provided in the engine 1 and the cooling water may be circulated in the water passage.

In the above embodiment, the heat of the cooling water is stored by storing the high-temperature cooling water in the heat storage tank 4. However, CH ₃ COONa, Ba (OH) ₂ -8H ₂
A heat storage tank made of a latent heat storage material such as O may be used.
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. The present invention can also be applied to a vehicle having a so-called air-mix type air conditioner that adjusts the temperature of the blown air.

The present invention can be implemented even if the intake heat exchanger 9 or one of the A / T heat exchanger 11 and the E / O heat exchanger 12 is eliminated.

[Brief description of the drawings]

FIG. 1 is a cooling water circuit diagram according to a first 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 control valve is assembled to a heat storage tank 4.

FIG. 4 is a sectional view taken along line AA of FIG. 1 (heat storage mode).

FIG. 5 is an enlarged view of a control valve element.

FIG. 6 is a sectional view taken along line AA of FIG. 1, showing a cooling water heat retaining mode.

FIG. 7 is a sectional view taken along the line AA of FIG. 1 showing an engine warm-up promotion mode.

FIG. 8 is a cooling water circuit diagram showing a flow of cooling water in an engine warm-up promotion mode.

FIG. 9 is a sectional view taken along the line AA of FIG. 1 showing an immediate heating mode.

FIG. 10 is a cooling water circuit diagram showing the flow of cooling water in an immediate heating mode.

FIG. 11 is a sectional view taken along the line AA of FIG. 1 showing a cold water holding mode.

FIG. 12 is a cooling water circuit diagram showing a flow of cooling water in a cold water holding mode.

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

FIG. 14 is a flowchart showing the operation of the switching valve corresponding to each mode.

FIG. 15 is a flowchart showing the operation of the switching valve corresponding to each mode.

FIG. 16 is a graph of test results showing the effect of reducing exhaust harmful substances and the effect of improving fuel efficiency of the present invention.

FIG. 17 is a graph of test results showing the warming-up promoting effect of the present invention.

FIG. 18 is a cooling water circuit diagram according to a second embodiment of the present invention.

[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
5: load response valve (second valve means), 24: switching valve (first valve means), 45: open flow path (tank water path), 100: radiator water path, 101: first bypass water path (first temperature-sensitive water path) ), 102... Second bypass waterway (second temperature-sensitive waterway), 1
06 ... warm-up water channel, 261 ... housing, 262 ... control valve body.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsumi Inoue 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Nippon Denso Co., Ltd. Inside the Automotive Parts Research Laboratory

Claims (6)

[Claims] 1. A water-cooled internal combustion engine (1), a radiator (2) for radiating heat of cooling water discharged from the water-cooled internal combustion engine (1), and cooling discharged from the water-cooled internal combustion engine (1) A cooling water control valve applied to a cooling water circuit of an internal combustion engine having a heat storage tank (4) that guides water and stores heat, the cooling water control valve being formed in a housing (261) and the housing (261), and one end thereof. A water-cooled internal combustion engine (1), a radiator (2) connected to the radiator (2) and a radiator waterway (100b) connected to the water-cooled internal combustion engine (1) at the other end; From the housing (26)
1) Temperature sensing part (13) for sensing the temperature of the cooling water flowing into
a), a temperature-sensitive operating valve (13) that opens and closes the radiator water channel (100b) in accordance with the cooling water temperature sensed by the temperature-sensing section (13a), and is formed in the housing (261). A temperature-sensitive water having one end connected to the cooling water discharge side of the water-cooled internal combustion engine (1) and the other end connected to the cooling water inflow side of the water-cooled internal combustion engine (1) via the temperature-sensing section (13a). A passage (101) for guiding the cooling water flowing out of the heat storage tank (4) to the water-cooled internal combustion engine (1) to perform the warm-up operation of the water-cooled internal combustion engine (1). A cooling water control valve for closing a hot water passage (101). 2. A warm-up water channel (10) for guiding cooling water flowing out of the heat storage tank (4) to the water-cooled internal combustion engine (1).
6) is formed in the housing (261), and when the temperature of the cooling water flowing out of the heat storage tank (4) is equal to or lower than a predetermined temperature, the warm-up water passage (106) is closed. Item 2. The cooling water control valve according to Item 1. 3. A tank channel (10) for guiding cooling water discharged from the water-cooled internal combustion engine (1) to the heat storage tank (4).
7) is formed in said housing (261), and said tank water channel (107) is closed when said water-cooled internal combustion engine (1) is stopped.
3. The cooling water control valve according to item 1. 4. Opening and closing of the temperature-sensitive channel (102), the warm-up channel (106) and the tank channel (107)
4. The cooling water control valve according to claim 1, wherein the control is performed by a single control valve body. 5. A cooling water circuit configured to circulate cooling water of a water-cooled internal combustion engine (1) by a pump (3), wherein heat of the cooling water discharged from the water-cooled internal combustion engine (1) is radiated. A radiator (2), a radiator channel (100) for returning cooling water discharged from the water-cooled internal combustion engine (1) to the water-cooled internal combustion engine (1) via the radiator (2), and a water-cooled internal combustion engine. A temperature sensing portion (13a) for sensing a temperature of a cooling water discharged from the engine (1), and the radiator channel (1) is provided in accordance with the cooling water temperature sensed by the temperature sensing portion (13).
00), and cooling water discharged from the water-cooled internal combustion engine (1) is returned to the water-cooled internal combustion engine (1) through the temperature-sensitive section (13a). A first temperature-sensitive water channel (101), a heat storage tank (4) that guides cooling water discharged from the water-cooled internal combustion engine (1) to store heat, and a first device that opens and closes the first temperature-sensitive water channel (101). And valve means (24) for guiding the cooling water flowing out of the heat storage tank (4) to the water-cooled internal combustion engine (1) to perform the warm-up operation of the water-cooled internal combustion engine (1). A cooling water circuit for an internal combustion engine, wherein one valve means (24) is closed. 6. The temperature sensing section (13a) has a first temperature sensing section and a second temperature sensing section at different positions, and the first temperature sensing channel (101) includes the first temperature sensing section. A second temperature-sensitive water channel (102) for returning cooling water discharged from the water-cooled internal combustion engine (1) to the water-cooled internal combustion engine (1) via the second temperature-sensitive portion; When the load of the water-cooled internal combustion engine (1) exceeds a predetermined value, the second valve means (1) for opening the second thermosensitive water channel (102).
The cooling of the internal combustion engine according to claim 5, wherein the first valve means (24) is opened after the warm-up operation of the water-cooled internal combustion engine (1) is completed. Water circuit.