JP3478015B2 - Cooling system for internal combustion engine for vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system device for a water-cooled internal combustion engine (1) mounted on a vehicle, which utilizes a heat storage tank to appropriately control the temperature of cooling water.

[0002]

2. Description of the Related Art Conventionally, high-temperature cooling water is stored in a heat storage tank, and the high-temperature cooling water (hereinafter referred to as warm water) is supplied to an internal combustion engine (hereinafter referred to as engine) to promote warm-up at engine startup ( There is one disclosed in Japanese Patent Laid-Open No. 2-120119 as a device capable of immediate heating by performing (immediate effect warm-up) or flowing it through a heater core of a vehicle air conditioner.

This conventional apparatus is provided with a quick heating switch and a quick warming switch in the passenger compartment, and when the quick heating switch is turned on, the hot water in the heat storage tank has a small flow rate,
It is made to flow to the heater core, and when the immediate effect warm-up switch is turned on, a large amount of hot water in the heat storage tank is made to flow to the engine.

[0004]

In a vehicle equipped with the above engine, for example, an oil cooler, which is a heat exchanger for cooling engine oil circulating in the engine, is a lower tank (downstream tank) of a radiator. Some are located inside. Further, in the above-mentioned publication device, there is no description about such an oil cooler.

Therefore, according to the present invention, it is possible to quickly heat the interior of the vehicle by hot water in the heat storage tank, to quickly warm up the engine, and in consideration of the arrangement of various heat exchangers in the cooling circuit of the internal combustion engine. The purpose is to control the temperature of the cooling medium in these heat exchangers well.

[0006]

Since the present invention SUMMARY OF] is to achieve the above object, the invention of claim 1 Symbol placement, so as to circulate the cooling water of the water-cooled internal combustion engine (1) in the circulation pump (3) A heat storage tank (6) having a heat insulating structure for storing the cooling water flowing out from the internal combustion engine (1) in the cooling water circuit and a heat storage tank (6) installed downstream of the heat storage tank (6). Heater core (8) for heating the air by heating the air by exchanging heat between the cooling water and the air flowing out from
And an oil heat installed at the cooling water downstream side of the heating heater core (8) for exchanging heat between the cooling water and the lubricating oil of at least one of the lubricating oil of the internal combustion engine (1) and the working oil of the vehicle automatic transmission. exchanger (15, 16), wherein
It is provided in parallel with the heater core (8) for heating,
The heating heater core (8) a bypass circuit (10) for the flow of the cooling water to bypass the heat storage tank (6)
Installed in the cooling water circuit between the heater core (8) for
Serial flow rate of the cooling water passing through the heater core (8) and the bypass circuit (10) a flow control valve for controlling the flow rate of the coolant passing through the a (7) is provided, the flow control valve
Has been pivotally housed in the valve body control channel for flow control is formed (61) the valve housing (60), inlet cooling water from the heat storage tank (6) flows A pipe (63), a first outlet pipe (64) connected to the inlet side of the heating heater core (8), and a second outlet pipe (65) connected to the inlet side of the bypass circuit (10) When the first valve opening degree is established, the heat storage tank (6) and the bypass circuit (10) are connected by a first flow path, and the heating heater core (8) is connected to the valve body (61). ), The second
When the valve opening degree is 1, the heat storage tank (6) and the heating heater core (8) are communicated with each other by the orifice flow passage (62c) having a flow passage area smaller than that of the first flow passage, and the bypass circuit (10). ) Is closed by the valve body (61), and further has control means (7a, 32) for controlling the flow rate control valve (7), and the control means (7a, 32) is the internal combustion engine at the heat storage tank (6) of the cooling water (1) when warming up controls before <br/> Symbol flow control valve the valve opening (7) to said first valve opening , when quick heating of the passenger compartment in the heat storage tank (6) of the cooling water, before the valve opening degree prior Symbol flow control valve (7)
It is characterized in that it is controlled to the second valve opening degree .

[0007] Thus, in the flow control valve, be allowed to flow high-temperature cooling water in the heat storage tank to the bypass circuits, it is possible to perform warm-up promotion of the internal combustion engine, at a flow rate control valve, in the heat storage tank If high-temperature cooling water is supplied to the heater core for heating , the interior of the vehicle can be quickly heated. Further, since the oil heat exchanger is provided on the downstream side of the heating heater core, during normal times when the cooling water in the cooling water circuit is sufficiently warm, the cooling water passing through the heating heater core causes The oil can be cooled well.

According to the second aspect of the invention, the cooling water of the water-cooled internal combustion engine (1) flows out from the internal combustion engine (1) into a cooling water circuit in which a circulation pump (3) circulates the cooling water. A heat storage tank (6) having a heat insulating structure for storing the cooling water and a downstream side of the heat storage tank (6),
A heating heater core (8) for heating the air by heating the air by exchanging heat between the cooling water and the air flowing out from the heat storage tank (6), and the cooling heater downstream from the heating heater core (8). And an intake air heat exchanger (12) for exchanging heat with intake air of the internal combustion engine (1) and the heating heater core (8) in parallel, bypassing the heating heater core (8), and the cooling water. Is installed in a cooling water circuit between the heat storage tank (6) and the heater core (8) for heating, and a bypass circuit (10) for flowing the heater heater core (8).
Flow of cooling water through the bypass circuit (1
0) and a flow rate control valve (7) for controlling the flow rate of the cooling water passing therethrough, wherein the flow rate control valve is a control for flow rate control.
Valve body flow passage is formed (61) the valve housings (60)
An inlet pipe (63), which is rotatably housed therein, into which cooling water from the heat storage tank (6) flows,
The first connected to the inlet side of the heating heater core (8)
It has an outlet pipe (64) and a second outlet pipe (65) connected to the inlet side of the bypass circuit (10), and at the first valve opening degree, the heat storage tank (6) and the bypass. When the circuit (10) communicates with the first flow path,
Both the heating heater core (8) and the valve body (61)
When the second valve is opened, the heat storage tank (6) and the heating heater core (8) have an orifice flow passage (6) having a flow passage area smaller than that of the first flow passage.
2c) and the bypass circuit (1
0) is closed by the valve body (61), and further has control means (7a, 32) for controlling the flow rate control valve (7), and the control means (7a, 32)
, The internal combustion engine in the heat storage tank (6) of the cooling water (1) when warming up controls before Symbol flow control valve the valve opening (7) to said first valve opening, When the passenger compartment is immediately heated by the cooling water in the heat storage tank (6),
Is characterized braking <br/> Gosuru that the second valve opening the valve opening before Symbol flow control valve (7).

[0009] Thus, in the flow control valve, be allowed to flow high-temperature cooling water in the heat storage tank to the bypass circuits, it is possible to perform warm-up promotion of the internal combustion engine, at a flow rate control valve, in the heat storage tank If high-temperature cooling water is supplied to the heater core for heating , the interior of the vehicle can be quickly heated. Furthermore, since the intake air heat exchanger is provided on the downstream side of the heating heater core, the intake air can be favorably heated by the cooling water that has passed through the heating heater core.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a running internal combustion engine of a vehicle, which is a water-cooled type. 2 is a radiator, which is a cooling fan 2a
The cooling air blown by is exchanged with the cooling water of the internal combustion engine 1 to cool the cooling water. 3 is an internal combustion engine 1
Is a water pump driven by a pump for circulating cooling water in the cooling water circuit.

Reference numeral 8 denotes a heater core (heating heat exchanger) of an automobile air conditioner, which heats the conditioned air blown by a blower 25 for air conditioning by exchanging heat with cooling water.
The heater core 8 is an air conditioning unit 2 which is a ventilation passage for air conditioning.
4 is installed on the air downstream side of the cooling evaporator 26. The blower 25 is an electric type driven by a motor 25a.

The vehicle air conditioner according to this embodiment is an air mix type air conditioner that adjusts the mixing ratio of cold air and warm air by the air mix door 28 to a desired air conditioning air temperature. That is, a bypass passage 27 is provided in the air conditioner for a vehicle, which bypasses the heater core 8 with the cool air passing through the evaporator 26 for cooling.
By adjusting the ratio of the cool air passing through the bypass passage 27 and the air passing through the heater core, the temperature of the conditioned air is adjusted. The air mix door 28 is driven by a servo motor 28a.

A flow rate control valve 7 is installed on the cooling water inlet side of the heater core 8. In the present embodiment, the flow rate control is performed when it is necessary to flow the cooling water to the heater core 8 in order to obtain a desired temperature of the conditioned air. When the valve 7 has the valve opening degree shown in FIG. 1 and is not necessary, for example, when all the blown air that has passed through the cooling evaporator 26 passes through the bypass passage 27, the valve opening degree shown in step S5 in FIG. 3 described later. It is what

Reference numeral 10 denotes a bypass circuit provided in parallel with the cooling water circuit of the heater core 8. The flow control valve 7 in this embodiment is of a five-way valve type for adjusting the cooling water flow rate to the heater core 8 and the bypass circuit 10. ing. The valve opening of the flow control valve 7 can be electrically controlled by the servomotor 7a. The details of the flow rate control valve 7 will be described later.

[0015] 11 denotes an air cleaner to clean the intake air of the internal combustion engine 1, 12 is provided in the air cleaner 11, an intake heat exchanger to the intake air of the internal combustion engine 1 and the cooling water heat exchanger, the heater core 8 Is provided in series with the heater core 8 on the downstream side of the cooling water circuit. The cooling water circuit downstream side of the intake heat exchanger 12 and the outlet portion of the bypass circuit 10 are joined. A is the junction.

Reference numeral 15 denotes a first oil heat exchanger for exchanging heat between engine oil (engine lubricating oil) and cooling water,
Reference numeral 16 is a second oil heat exchanger for exchanging heat between the automatic transmission operating oil of the vehicle and the cooling water, and both of these oil heat exchangers 15 and 16 are, in this example, the merging portion A and the water pump 3.
Is arranged in parallel with the suction side cooling water circuit. 6
Is a heat storage tank for storing high-temperature cooling water.
Like the heat storage tank described in the publication, it has a vacuum heat insulation structure like a thermos. This heat storage tank 6 is installed in the cooling water circuit between the cooling water outlet of the internal combustion engine 1 and the inlet side of the flow control valve 7. Inside the heat storage tank 6, the inlet pipe 6a is downward in the vertical direction. The outlet pipe 6b is opened upward and upward. The heat storage tank 6 has a capacity of, for example, about 3 liters.

Reference numeral 4 denotes a bypass circuit provided in parallel with the radiator 2 and reference numeral 5 denotes a thermostat (cooling water temperature responsive valve) for controlling the flow of cooling water to the radiator 2 and the bypass circuit 4. The volume depends on the temperature of the thermowax. By utilizing the change, the valve body (not shown) is displaced to switch the cooling water flow path. Specifically, when the cooling water temperature is low, the thermostat 5 opens the bypass circuit 4 side to allow the cooling water to flow to the bypass circuit 4 side, and when the cooling water temperature rises above a predetermined temperature, the thermostat 5 causes the radiator to move. The cooling water is cooled in the radiator 2 by opening the second side and closing the bypass circuit 4 side.

Reference numeral 22 is a temperature sensor for detecting the cooling water temperature at the cooling water outlet of the internal combustion engine 1, and 19 is a temperature sensor for detecting the cooling water temperature flowing out from the heat storage tank 6, both of which are temperature-sensitive resistors such as thermistors. It consists of elements. Reference numeral 30 denotes a well-known sensor group for automatic control of an automobile air conditioner, which includes an inside air sensor for detecting a vehicle interior temperature, an outside air sensor for detecting an outside air temperature, a solar radiation sensor for detecting a solar radiation amount, and an evaporation for detecting an evaporator cooling temperature. It includes a vessel temperature sensor and so on.

Reference numeral 31 is an air conditioning switch group provided on a control panel (not shown) of the air conditioning system for automobiles. Reference numeral 32 denotes an electronic control unit for an automobile air conditioner using a microcomputer, which determines an input signal input from the sensor 19, 22, 30, 31 or the like according to a preset program, performs arithmetic processing, and performs the arithmetic operation. The blower 25, the air mix door 28, based on the processing result,
The operation of the flow control valve 7 is controlled. Also,
In the present embodiment, as an input terminal of the electronic control unit 32,
A quick heating switch 33 for performing quick heating is connected by high-temperature cooling water in a heat storage tank 6 described later.

Further, the electronic control unit 32 is adapted to automatically control the operation of an inside / outside air switching door, an outlet switching door, etc., which are not shown, by a method well known in the air conditioning system for automobiles. Next, the flow rate adjusting valve 7 described above will be described in detail. FIG. 2 exemplifies a specific structure of the flow control valve 7 described above. A resin-made valve housing 60 accommodates a cylindrical resin-made valve element 61 rotatably. A control passage 62 for controlling the flow rate is formed in the valve body (rotor) 61. The valve housing 60, a second outlet cooling water from the thermal storage tank 6 which is connected to the inlet side of the inlet pipe 63, a first outlet pipe 64 is connected to the inlet side of the heater core 8, and the bypass circuit 1 0 flowing The pipe 65 is integrally molded.

The control flow passage 62 adjusts the opening area of the inlet pipe 63 at one end side thereof, and the first outlet pipe 64 at the other end side thereof.
The opening area of the second outlet pipe 65 is adjusted. Further, in the flow control valve 7 of the present embodiment, the T-shaped flow passage 62a formed exactly in the T-shape and the orifice flow passage 62c having a very small flow passage cross-sectional area form the T-shaped flow passage 62a. It is of a five-way valve type configured to intersect at the confluence portion 62b. Further, as shown in FIG. 2, the orifice channel 62c has a channel area smaller than that of the T-shaped channel 62a.

Rotating shafts (not shown) are provided at both axial ends of a cylindrical valve body (rotor) 61.
The rotation of the servo motor 7a is transmitted to the shaft portion, and the valve body 61 is rotated in the housing 60. Next, the operation of this embodiment with the above configuration will be described. FIG. 3 is a flowchart showing the control contents by the electronic control unit 32. When the ignition switch (engine key switch) (not shown) of the automobile is turned on and the internal combustion engine 1 is started, the electronic control unit 32 is turned on, The control routine shown in FIG. 3 is started. The flow control valve 7 in the present embodiment always has a valve opening degree as shown in FIG. 1 when the ignition switch is off, and the T-shaped flow path 6b causes the heat storage tank 6 to flow out. The pipe 6b communicates with both the heater core 8 and the bypass circuit 10.

Therefore, when the internal combustion engine 1 is started, the water pump 3 is driven, so that the cooling water flowing out from the internal combustion engine 1 flows into the heat storage tank 6, and the cooling water in the heat storage tank 6 is pushed out. Then, in step S1, the signals from the sensors 19, 22, 30 and the switches 31, 33 are read. Further, at this time, the water temperature sensor 22 determines that the cooling water temperature T in the internal combustion engine 1 corresponding to before the internal combustion engine 1 is started.
The water temperature sensor 19 detects W1 and the heat storage tank 6
The cooling water temperature TW2 pushed out from the inside is detected.

Next, in step S2, it is determined whether or not the quick heating switch 33 is on, and the quick heating switch 33 is turned on.
If is turned on, the process proceeds to step S3 to effect immediate heating for heating the interior of the vehicle immediately, and if the rapid heating switch 33 is turned off, the process proceeds to step S4 to effect warm-up of the internal combustion engine 1. Then, in step S4, in order to determine whether or not the internal combustion engine 1 needs to be warmed up immediately, the temperature sensor 22
It is determined whether the cooling water temperature TW1 at the cooling water outlet of the internal combustion engine 1 detected by the above is equal to or lower than a predetermined temperature (70 ° C. in this example).

When the internal combustion engine 1 is started after a considerable amount of time has passed since the last stop of the internal combustion engine 1, the cooling water temperature has dropped to 70 ° C. or lower, so that the step S4
The determination is YES, and the process proceeds to the next step S5.
Then, in this step S5, as shown in the figure, the opening degree of the flow control valve 7 is set so that the cooling water pushed out of the heat storage tank 6 by the T-shaped flow path 62a does not flow into the heater core 8 and the bypass circuit Switch so that only 10 flows. FIG. 4 schematically shows how the cooling water flows in this case.

As a result, the high-temperature cooling water in the heat storage tank 6 passes through the bypass circuit 10 as shown by X in FIG. 4 and the intake heat exchanger 12, the first oil heat exchanger 15, and the second oil heat exchange. It comes to flow through the vessel 16. At this time, in the present embodiment, about 6 liters / min of cooling water flows into the bypass circuit 10, and the heat storage tank 6
Has a capacity of about 3 liters, the high temperature cooling water in the heat storage tank 6 is completely pushed out in about 30 seconds and completely flows into the bypass circuit 10.

Then, in step S6, it is determined whether the elapsed time t after the start of the internal combustion engine 1 has passed a predetermined time (30 seconds in this example). While the determination is NO, that is, during 30 seconds, the high-temperature cooling water in the heat storage tank 6 is being pushed out to the bypass circuit 10 as described above, so the flow control valve 7 opens the valve shown in step S5. It becomes degree. Hereinafter, the warm-up effect by the cooling water in this case will be described.

The high-temperature cooling water in the heat storage tank 6 heats the intake air of the engine 1 in the intake heat exchanger 12, and the amount of fuel required for warming up the engine can be reduced due to the rise in intake air temperature, thus reducing fuel consumption. it can. At this time, according to the study by the present inventor, when the temperature of the cooling water in the heat storage tank 6 is 80 ° C. and the temperature of the intake air is 0 ° C., the intake air has a small heat capacity, so the temperature of the cooling water in the intake heat exchanger 12 is small. Is only 2 ° C
It became a degree. Therefore, at the outlet of the intake heat exchanger 12, the cooling water temperature is maintained at a high temperature of about 78 ° C.

Next, the cooling water that has passed through the intake air heat exchanger 12 receives the first and second oil heat exchangers 1 arranged in parallel.
5 and 16 , where engine lubricating oil and transmission operating oil are heated to reduce friction loss of the internal combustion engine 1 and the transmission, thereby reducing fuel consumption. Further, warming up of the internal combustion engine 1 is promoted by the rise of the oil temperature. Then, after passing through both oil heat exchangers 15 and 16, the cooling water is cooled to 5
Until 0 ° about C, and the temperature is lowered, the cooling water temperature is higher than the temperature of the cooling water in the engine 1 has dropped to ambient temperature about the same temperature, both the oil heat exchanger 1 5, 1
When the cooling water of about 50 ° C. that has passed through 6 is returned to the internal combustion engine 1, warming up of the internal combustion engine 1 can be promoted.

[0030] Thus, the cooling water temperature of the internal combustion organizations 1, the increased in a short time of about 30 seconds to a temperature of about 35 ° C, can rapidly terminate the warming-up of the engine 1. Therefore, it is possible to effectively achieve reduction of fuel consumption and purification of exhaust gas when the engine is warmed up. At the same time, the temperature of the cooling water of the engine 1 rapidly rises, so that hot water heating by the heater core 8 by radiating the cooling water can be started in a short time after the engine is started. In addition,
Predetermined time in step S 6 is was the 30 seconds in the present embodiment, the time the capacity of the heat storage tank 13, an exhaust capacity of the engine 1, it is preferable to appropriately increased or decreased depending on the coolant capacity of the engine 1. Then, if it is determined in step S6 that 30 seconds have elapsed, the process exits this flowchart and returns.

On the other hand, if YES is determined in the step S2, the immediate effect heating is performed. However, before the immediate effect heating is performed, the ignition switch detected by the water temperature sensor 22 is turned on in the step S3. Corresponding internal combustion engine 1
The cooling water temperature TW1 in the inside is lower than 40 ° C., for example, and the cooling water temperature T in the heat storage tank 6 detected by the water temperature sensor 19 is detected.
It is determined whether or not W2 is higher than 45 ° C. If the determination result is YES, the process proceeds to step S8, and the determination result is N
In the case of O, the process proceeds to step S7.

That is, in step S8, the cooling water temperature TW2 in the heat storage tank 6 is the cooling water temperature TW1 in the internal combustion engine 1.
When the temperature is higher and the occupant has a feeling of heating due to the cooling water in the heat storage tank 6, the flow control valve 7 has a valve opening degree as shown in the figure. The valve opening of the flow control valve 7 is such that the heat storage tank 6 and the heater core 8 communicate with each other through the orifice flow path 62c and the valve 61 closes the bypass circuit 10 as shown in the figure. . As a result, the flow of the cooling water in this case becomes as shown by Y in FIG. 5, and the high-temperature cooling water in the heat storage tank 6 passes through the orifice passage 62c and flows into the heater core 8 so that the intake heat It flows through the exchanger 12 and the first and second oil heat exchangers 15 and 16. In the present embodiment, the amount of cooling water flowing from the heat storage tank 6 into the heater core 8 is the orifice flow path 62c.
Therefore, it is squeezed to be 1 liter / min.

The reason why the flow rate is reduced in this way is that when the cooling water in the heat storage tank 6 is flowed into the heater core 8 at a rate of, for example, 31 liters / min, the capacity of the heat storage tank 6 is 3 liters. This is because the passenger compartment can be heated only for minutes. Therefore, in this embodiment, since the cooling water in the heat storage tank 6 is allowed to flow into the heater core 8 at 1 liter / min in order to maintain the immediate heating for a long time, the immediate heating is performed for about 3 minutes. be able to.

Then, in step S9, the blower 25 is started to perform the immediate heating blow control, and the blow rate of the blower 25 (voltage applied to the electric motor 25a) is measured by the water temperature sensor 1.
9 is set according to the cooling water temperature TW2 detected. For example, the higher the cooling water temperature TW2, the larger the amount of air blown by the blower 25. As a result, it is possible to effectively heat the passenger compartment in accordance with the warmth of the occupant.

Next, at step S10, as a determination to terminate the immediate heating, is the cooling water temperature TW2 detected by the water temperature sensor 19 lower than the previously detected cooling water temperature by a predetermined value ΔT (7 ° C. in this embodiment) or more? Determine whether or not. That is, the high-speed cooling water flows from the inside of the heat storage tank 6 into the heater core 8 by performing immediate heating, but when the high-temperature cooling water completely flows out from the inside of the heat storage tank 6,
In the heat storage tank 6, the low temperature cooling water that has flowed in from the internal combustion engine 1 side is stored. Therefore, the heat storage tank 6
After the inside of the high-temperature cooling water is exhausted, the cooling water temperature TW2 detected by the water temperature sensor 19 is lowered, and the termination of the immediate heating is determined by looking at this lowered temperature ΔT.

Then, as the immediate heating end, step S
7, the valve opening degree of the flow control valve 7 is changed as shown in the figure.
Outflow pipe 6 of heat storage tank 6 by T-shaped flow path 62a
The b is returned so as to communicate with both the heater core 8 and the bypass circuit 10. By the way, the above-mentioned automobile air conditioner
The opening degree of the air mix door 8 is automatically controlled by the electronic control unit 32 based on the detection values of the sensors 22 and 30 and the set value of the switch 31 described above. Hereinafter, the control content will be described. It should be noted that this explanation is based on the premise that the temperature of the cooling water in the cooling water circuit is sufficiently high after the above-mentioned warm-up is completed.

Since the air-mixing door 28 has a large required heating capacity in winter, the air-mixing door 28 is often used near the operating position shown by D in FIG. In this case, a large volume of feed air is heat-exchanged in the heater core 8, the cooling water temperature at the heater core 8 outlet decreases to a temperature of about 50-65 ° C. Therefore,
With this relatively high temperature cooling water, the intake air of the engine 1 can be effectively heated in the intake heat exchanger 12, and the fuel consumption can be improved. Then, the first and second oil heat exchangers 15 are further cooled by the cooling water that has passed through the intake heat exchanger 12.
The oil can be cooled at 16.

Therefore, during normal running after the engine has been warmed up, the intake air temperature and the oil temperature can be controlled satisfactorily, and fuel consumption reduction and exhaust gas purification can be achieved. The cooling water is cooled in the radiator 2 as usual. In the above-described embodiment, switching between quick heating and quick warming is performed by the valve (flow control valve 7) that intermittently supplies the cooling water to the heater core 8 in the air mix type air conditioner for an automobile. As a result, it is possible to switch quickly between quick heating and quick heating at low cost. Further, since the flow path control valve 7 is formed with the orifice flow path 62a, the quick heating can be continued for a long time.

Although the air-mixing type air conditioner for automobiles has been described in the present embodiment, the present invention can be applied to a reheat type automobile air conditioner. Further, in this case, the effect in the normal time is different from that of the air mix type described above, and this will be described below. It should be noted that components having the same functions as those of the air mix type air conditioner for automobiles described above are designated by the same reference numerals.

The reheat type automotive air conditioner does not have the air mix door 28 described above, but has an evaporator 26 for cooling.
The blown air that has passed through is configured to flow through the heater core 8 almost entirely, and the temperature of the conditioned air is adjusted by adjusting the flow rate of the cooling water flowing through the heater core 8 with the adjusting valve. For example, this adjusting valve is installed between the flow rate control valve 7 and the heater core 8 in FIG.

Then, this adjusting valve is in a state where the flow rate to the heater core 8 is throttled from the intermediate season of spring and autumn to the summer. Therefore, this small flow rate of cooling water exchanges heat with the blown air of the blower 25 in the heater core 8 and 1
The temperature drops to a low temperature of about 5 to 20 ° C. Therefore, this low temperature cooling water can effectively cool the intake air of the engine 1 in the intake heat exchanger 12 and reduce fuel consumption.

Further, since the required heating capacity becomes large in winter, a large amount of cooling water flows into the heater core 8 by the adjusting valve. As described above, since the flow rate of the cooling water increases, even if the cooling water exchanges heat with the blown air of the blower 25 at the heater core 8, the cooling water temperature at the outlet of the heater core 8 decreases to a temperature of about 50 to 65 ° C. Only. Therefore, the intake air of the engine 1 can be effectively heated in the intake heat exchanger 12 by the relatively high temperature cooling water, and the fuel consumption can be improved.

Since the heat capacity of the intake air is small,
Oil can be heated in the first and second oil heat exchangers 15 and 16 by the cooling water that has passed through the intake heat exchanger 12. Therefore, even during normal running after the engine has been warmed up, the intake air temperature and the oil temperature can be satisfactorily controlled throughout the year, and fuel consumption reduction and exhaust gas purification can be achieved.

Furthermore, in each of the above-described embodiments, the first and second oil heat exchangers 15 and 16 are arranged in parallel between the junction A and the suction side cooling water circuit of the water pump 3. However, both oil heat exchangers 15 and 16 may be arranged in series. In this case, the preferred operating temperature is 11
The second oil heat exchanger 16 through which the transmission operating oil having a preferable operating temperature of about 80 ° C flows is arranged upstream of the first oil heat exchanger 15 through which the engine lubricating oil of about 0 ° C flows. Placing it on the side has a great effect of reducing fuel consumption by reducing friction loss.

Further, in step S6 of FIG. 3 in the above-described embodiment, it is determined whether or not the elapsed time t after the engine has started exceeds a predetermined time, and it is determined that the warm-up has ended.
Other determination method For example, it may be determined whether or not the temperature of the cooling water at the outlet of the engine 1 detected by the temperature sensor 16 has risen to a predetermined temperature to determine the end of warm-up.

Further, in the above embodiment, the orifice flow passage 62a is formed in the flow control valve 7 in order to reduce the flow rate flowing into the heater core 8 during the quick heating, but the function of this orifice flow passage 62a is separately provided. May be provided. Further, in the above-described embodiment, the intake heat exchanger 12, the cooling water from the heat storage tank 6 in the quick effect warm-up,
Although the engine 1 was warmed up after flowing through the first and second oil heat exchangers 15 and 16, the cooling water in the heat storage tank 6 circulates between the heat storage tank 6 and the engine 1 at the time of immediate effect warming up. You can

[Brief description of drawings]

FIG. 1 is a cooling water circuit diagram showing an embodiment of the present invention.

FIG. 2 is a specific view of a flow rate control valve in the above embodiment.

FIG. 3 is a flowchart showing an example of control operation in the above embodiment.

FIG. 4 is a schematic diagram showing how the cooling water flows during the quick effect warm-up of the above embodiment.

[Fig. 5] Fig. 5 is a schematic diagram showing a flow of cooling water at the time of immediate heating in the above embodiment.

[Explanation of symbols]

1 ... Internal combustion engine, 3 ... Water pump, 4 ... Heater core,
6 ... Heat storage tank 7 ... Flow control valve, 10 ... Bypass circuit, 12 ... Intake heat exchanger, 15, 16 ... First and second oil heat exchangers, 32
… Electronic control unit.

Front page continuation (72) Inventor Sugimitsu 1-1 Showa-cho, Kariya city, Aichi Japan Denso Co., Ltd. (56) References JP-A-8-183324 (JP, A) JP-A-6-328930 (JP , A) Japanese Unexamined Patent Publication No. 2-120119 (JP, A) Actual Development No. 5-83323 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/00-1/34

Claims (7)

(57) [Claims] 1. A heat insulating structure for storing cooling water flowing out from the internal combustion engine (1) in a cooling water circuit in which the cooling water of the water-cooled internal combustion engine (1) is circulated by a circulation pump (3). And a heat storage tank (6) having a heat storage tank (6) installed downstream of the heat storage tank (6) to exchange heat with the cooling water flowing out from the heat storage tank (6) to heat the air to cool the interior of the vehicle. Heater core for heating to heat (8)
And an oil which is installed on the cooling water downstream side of the heating heater core (8) and exchanges heat between the cooling oil and the lubricating oil of at least one of the lubricating oil of the internal combustion engine (1) and the working oil of the vehicle automatic transmission. The heat exchanger (15, 16) is provided in parallel with the heating heater core (8) and
A bypass circuit (10) for bypassing the cooling water by bypassing the heater core (8) for the bunch , the heat storage tank (6) and the heater core (8) for heating.
And a flow rate control valve (7) that is installed in the cooling water circuit between the two and controls the flow rate of the cooling water passing through the heating heater core (8) and the flow rate of the cooling water passing through the bypass circuit (10). The flow control valve has a control flow path for flow control.
A valve body (61) is rotatably accommodated in a valve housing ( 60), an inlet pipe (63) into which cooling water from the heat storage tank (6) flows, and the heating heater core (8). Outlet pipe (64) connected to the inlet side of the
And a second outlet pipe (65) connected to the inlet side of the bypass circuit (10), the heat storage tank (6) and the bypass circuit (10) at the first valve opening degree.
And the heating heater core (8) are closed by the valve body (61), and when the second valve opening degree is reached, the heat storage tank (6) and the heating heater core are connected. (8) is communicated with an orifice channel (62c) having a channel area smaller than that of the first channel, and the bypass circuit (10) is connected to the valve body (6).
Is obtained by so as to close by 1), the control means (7 for controlling further the flow rate control valve (7)
a, 32), the control means (7a, 32) includes the heat storage tank (6).
The internal combustion engine by the cooling water of the inner (1) to the time of warm-up, the valve opening degree prior Symbol flow control valve (7) first valve opening
Controls to, when quick heating of the passenger compartment in the heat storage tank (6) of the cooling water, the valve before Symbol flow control valve (7) opens
Degree is controlled to the second valve opening degree, a cooling system device for an internal combustion engine for a vehicle. 2. An adiabatic structure for storing cooling water flowing out from the internal combustion engine (1) in a cooling water circuit in which the cooling water of the water-cooled internal combustion engine (1) is circulated by a circulation pump (3). And a heat storage tank (6) having a heat storage tank (6) installed downstream of the heat storage tank (6) to exchange heat with the cooling water flowing out from the heat storage tank (6) to heat the air to cool the interior of the vehicle. Heater core for heating to heat (8)
An intake air heat exchanger (12) installed downstream of cooling water of the heating heater core (8) for exchanging heat with intake air of the internal combustion engine (1), and in parallel with the heating heater core (8). Is provided and warm
A bypass circuit (10) for bypassing the cooling water by bypassing the heater core (8) for the bunch , the heat storage tank (6) and the heater core (8) for heating.
And a flow rate control valve (7) that is installed in the cooling water circuit between the two and controls the flow rate of the cooling water passing through the heating heater core (8) and the flow rate of the cooling water passing through the bypass circuit (10). The flow control valve has a control flow path for flow control.
A valve body (61) is rotatably accommodated in a valve housing ( 60), an inlet pipe (63) into which cooling water from the heat storage tank (6) flows, and the heating heater core (8). Outlet pipe (64) connected to the inlet side of the
And a second outlet pipe (65) connected to the inlet side of the bypass circuit (10), and at the first valve opening degree, the heat storage tank (6) and the bypass circuit (10).
And the heating heater core (8) are closed by the valve body (61), and when the second valve opening degree is reached, the heat storage tank (6) and the heating heater core are connected. (8) is communicated with an orifice channel (62c) having a channel area smaller than that of the first channel, and the bypass circuit (10) is connected to the valve body (6).
Is obtained by so as to close by 1), the control means (7 for controlling further the flow rate control valve (7)
a, 32), the control means (7a, 32) includes the heat storage tank (6).
The internal combustion engine by the cooling water of the inner (1) to the time of warm-up, the valve opening degree prior Symbol flow control valve (7) first valve opening
Controls to, when quick heating of the passenger compartment in the heat storage tank (6) of the cooling water, the valve before Symbol flow control valve (7) opens
Degree is controlled to the second valve opening degree, a cooling system device for an internal combustion engine for a vehicle. 3. A heat insulating structure for storing cooling water flowing out from the internal combustion engine (1) in a cooling water circuit in which the cooling water of the water cooling type internal combustion engine (1) is circulated by a circulation pump (3). And a heat storage tank (6) having a heat storage tank (6) installed downstream of the heat storage tank (6) to exchange heat with the cooling water flowing out from the heat storage tank (6) to heat the air to cool the interior of the vehicle. Heater core for heating to heat (8)
When, placed before SL in the cooling water downstream of the heater core (8), the internal combustion engine (1) suction and intake heat exchanger and cooling water heat exchange with (12), the intake heat exchanger ( 12) is installed on the downstream side of the confluence point (A) between the downstream side of the cooling water and the downstream side of the bypass circuit (10), and at least the lubricating oil of the internal combustion engine (1) and the working oil of the vehicle automatic transmission are provided. Oil heat exchanger (15, 16) for exchanging heat between one lubricating oil and cooling water
Is provided in parallel with the heating heater core (8),
A bypass circuit (10) for bypassing the cooling water by bypassing the heater core (8) for the bunch , the heat storage tank (6) and the heater core (8) for heating.
And a flow rate control valve (7) that is installed in the cooling water circuit between the two and controls the flow rate of the cooling water passing through the heating heater core (8) and the flow rate of the cooling water passing through the bypass circuit (10). The flow control valve has a control flow path for flow control.
A valve body (61) is rotatably accommodated in a valve housing ( 60), an inlet pipe (63) into which cooling water from the heat storage tank (6) flows, and the heating heater core (8). a first outlet pipes connected to the inlet side (64), the inlet side of the bypass circuit (10)
A second outlet pipe (65 ) to be connected , and when the first valve opening degree is established, the heat storage tank (6) and the bypass circuit (10) are connected by a first flow path and the heating is performed. The heater core (8) is closed by the valve element (61), and when the second valve opening degree is reached, the heat storage tank (6) and the heating heater core (8) are connected to the first heater core (8).
Orifice channel (62c) whose channel area is smaller than that of
Wherein is a bypass circuit (10) that so as to close by the valve body (61), control means for controlling further the flow rate control valve (7) communicated with the (7
a, 32), the control means (7a, 32) includes the heat storage tank (6).
The internal combustion engine by the cooling water of the inner (1) to the time of warm-up, the valve opening degree prior Symbol flow control valve (7) first valve opening
Controls to, when quick heating of the passenger compartment in the heat storage tank (6) of the cooling water, the valve before Symbol flow control valve (7) opens
Degree is controlled to the second valve opening degree, a cooling system device for an internal combustion engine for a vehicle. Wherein said control means (7a, 32), from said cooling water temperature of the internal combustion engine (1) at start-up is determined to be equal to or lower than a predetermined value, determining that the warming up of the internal combustion engine (1) Then, it is determined that the warm-up of the internal combustion engine (1) has ended by determining that a predetermined time has elapsed after the internal combustion engine (1) was started. 7. A cooling system device for an internal combustion engine for a vehicle according to claim 3. 5. A blower (25) for blowing air toward the heater core (8) for heating is provided, and in the vehicle compartment,
A prompt heating switch (3) for operating the blower (25) to heat the interior of the vehicle by the heater core (8) for heating.
3) is provided, and the quick heating switch (33) is provided.
The internal combustion engine (1) is warmed up when the immediate heating switch (33) is off, when the heating heater core (8) heats the interior of the vehicle. A cooling system device for an internal combustion engine for a vehicle according to any one of 1 to 4. 6. A first oil heat exchanger (15) as the oil heat exchanger (15, 16) for exchanging heat between lubricating oil and cooling water of the internal combustion engine (1), and the vehicle automatic transmission. The cooling system device for an internal combustion engine for a vehicle according to claim 1, further comprising a second oil heat exchanger (16) for exchanging heat between the working oil and the cooling water. 7. The flow control valve is formed in a T shape.
T-shaped flow path (62a), pre-Symbol orifice channel (62
c) are configured to intersect with each other at the confluence portion (62b) of the T-shaped flow path (62a), and when the first valve opening degree is reached, the heat storage tank (6) and the bypass circuit (6). 1
0) and said T-shaped flow path (62a) for a vehicle internal combustion engine according to any one of claims 1 to 6, characterized in that are in communication with the first flow path by Cooling system equipment.