JP2001260640A - Heating device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device for a vehicle capable of providing sufficient heating performance and cooling performance even for the vehicle having an engine with a small amount of waste heat and allowing miniaturizing of a thermal storage tank. SOLUTION: This heating device 1 for the vehicle circulates a part of cooling medium of a cooling system 10 of an internal combustion engine 11 to a heater core 331. The heating device 1 comprises a sub cooling water circuit 24 provided in parallel with a cooling water circuit that is constituted with the internal combustion engine and a heat core, the thermal storage tank 21 provided in the sub cooling water circuit, a pump 23 provided in the sub cooling water circuit, a heating means 22 provided in the thermal storage tank for heating the cooling water in the thermal storage tank, a switching valve 26 for stopping the cooling water flowing from the internal combustion engine to the heater core, and a selector valve 25 in the direction of the flow passage for switching between the cooling water circuit and the sub cooling water circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle heating system in which engine cooling water is guided to a heater core and serves as a heating source. In particular, the invention relates to a vehicle equipped with a high efficiency engine such as an idle stop vehicle or a diesel engine. The present invention relates to a vehicular heating device that can obtain a high heating performance and also obtain a cooling performance.

[0002]

2. Description of the Related Art In an on-vehicle heating system, cooling water of a water-cooled engine is guided to a heater core to serve as a heat source for heating. However, waste heat of the engine generated during traveling or the like is stored in a heat storage tank. Also, at the time of starting, for example, when the cooling water does not rise to a sufficient temperature, it has been proposed to use the heat of the heat storage tank to perform indoor heating and reduce the emission from the engine (for example, Japanese Patent Laid-Open No. 9-27662).
No. 4).

[0003]

However, in such a conventional vehicle heating apparatus, since the heat stored in the cooling water of the heat storage tank system is radiated when the engine is stopped, heating is performed. Although heating for a short time of about 2 minutes is possible, heating for a longer time requires a large-capacity heat storage tank, which is not suitable for a vehicle.

[0004] Further, in an idle stop car or a diesel engine car having little waste heat from the engine,
If the outside air temperature is extremely low, such as about −10 ° C. to −20 ° C., high-temperature cooling water cannot be obtained, and thus cannot be adopted for such vehicles.

Further, in the heating device disclosed in the above publication, the stop of the engine is considered only when heating is performed, and cooling is performed by a general cooling cycle. Therefore, when the engine stops, the cooling cycle also stops, and it is not possible to continuously perform indoor cooling,
It was unsuitable for the idle stop car described above.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and provides a vehicle equipped with an engine having a small amount of waste heat to obtain both sufficient heating performance and cooling performance. It is an object of the present invention to provide a vehicular heating device in which a heat storage tank can be reduced in size.

[0007]

According to the present invention, there is provided a vehicle heating apparatus for circulating a part of a cooling medium of a cooling system of an internal combustion engine to a heater core. A sub-cooling water circuit provided in parallel with a cooling water circuit composed of an engine and the heater core, a heat storage tank provided in the sub-cooling water circuit, a pump provided in the sub-cooling water circuit, A heating means provided in the heat storage tank for heating the cooling water in the heat storage tank, an on-off valve for stopping the cooling water from the internal combustion engine toward the heater core, and switching between the cooling water circuit and the sub-cooling water circuit And a flow direction switching valve.

At this time, when the internal combustion engine is stopped and in the heating mode, it is preferable that the cooling medium in the heat storage tank is heated by the heating means and circulated to the heater core.

In the present invention, since the heat storage tank having the heating means is provided, when the internal combustion engine is stopped and in the heating mode, the cooling medium in the heat storage tank is heated and then circulated to the heater core. Therefore, long-time heating can be continuously performed even with a small-capacity heat storage tank. In addition, even if the vehicle is equipped with a low-heat engine such as a high-efficiency engine or a diesel engine, and the outside temperature is low, sufficient heat can be supplied to the cooling water to ensure heating performance. Can be.

(2) According to the present invention, there is further provided a cooler unit including a cooling cycle, and when the internal combustion engine is operating and is in a cooling mode, the cooling water in the heat storage tank is replaced with the cooling water. A heating device for a vehicle is provided which circulates the air to the heater core in a circuit and guides a part of air cooled by an evaporator of the cooling cycle to the heater core.

At this time, when the internal combustion engine is stopped and in the cooling mode, it is preferable that the cooling water in the heat storage tank is circulated to the heater core, and the intake air is cooled by the heater core.

In the present invention, while the internal combustion engine is operating, the cooling water in the cooling water circuit is circulated through the heater core and cooled by the cool air cooled by the cooler unit. When the internal combustion engine is stopped and in the cooling mode, the cooling water in the cooled heat storage tank is circulated through the heater core and the intake air is cooled by the heater core, so that the internal combustion engine is stopped. Even if the cooling cycle is stopped, cooling can be performed continuously.

(3) Further, according to the present invention, there is further provided a cooler unit including a cooling cycle, wherein a part of the refrigerant of the cooling cycle is provided in the heat storage tank and the cooling water in the heat storage tank is provided. A vehicle heating device is provided that is circulated through a heat exchanger that performs heat exchange between the two.

At this time, when the cooling cycle is in operation, a part of the refrigerant is circulated to the heat exchanger to cool the cooling water in the heat storage tank, and when the internal combustion engine is stopped and in the cooling mode, It is preferable that the cooling water of the heat storage tank is circulated to the heater core, and the intake air is cooled by the heater core.

In the present invention, when cooling the cooling water in the heat storage tank during operation of the internal combustion engine, the cooling water is directly cooled by the heat exchanger using the refrigerant of the cooling cycle. In comparison, the indoor cooling capacity is further improved during the operation of the internal combustion engine.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a block diagram showing an embodiment of a vehicle heating device according to the present invention, and FIG. 2 is a sectional view showing a radiator according to the embodiment of FIG.

The vehicle heating apparatus 1 according to the present embodiment includes an engine cooling system 10 and an air conditioner 30.

The engine cooling system 10 includes an engine 11 having a water jacket, a radiator 12 provided in the vicinity of a front grill of the vehicle, and a thermostat for switching a flow path according to the temperature of cooling water (cooling medium of the present invention). Valve 13 and water pump 1 for circulating cooling water
And these are connected by pipes 15, 16, 17 and 18. When the temperature of the cooling water flowing down from the engine 11 is lower than a predetermined value, the thermostat valve 13 bypasses the cooling water to the radiator 12 to the pipe 18 to reduce the warm-up time. Govern

The air conditioner 30 includes the intake unit 3
1. The cooler unit 32 and the heater unit 33 are mounted in a vehicle cabin in a connected state. The intake unit 31 is formed with an outside air intake 311 and an inside air intake 312, and the flow rate of the outside air and the inside air is selected according to the opening degree of the intake door 313, which is blown to the cooler unit 32 by the blower fan 314.

The cooler unit 32 includes a cooling cycle 3
The evaporator 3 connected to the cooling medium 22 and circulating the cooling medium
When the intake air flowing down from the intake unit 31 passes through the evaporator 321, it is cooled by heat exchange and sent to the heater unit 33.

The cooling cycle 322 includes a compressor 323 for compressing the refrigerant into a high-temperature and high-pressure gaseous refrigerant;
The high-temperature and high-pressure gaseous refrigerant sent from the compressor 323 is cooled by taking in the air outside the vehicle cabin by the cooling fan, and the condenser 324 is deprived of latent heat of condensation to be a high-temperature and high-pressure liquid refrigerant. A liquid tank 325, an expansion valve 326 that rapidly expands the high-pressure liquid refrigerant that has passed through the condenser 324 to obtain a low-temperature, low-pressure mist refrigerant, and an evaporator 321 built in the cooler unit 32 include refrigerant pipes in this order. 3
27 to form a closed circuit.

The heater unit 33 is provided with a heater core 331 for circulating the above-mentioned engine cooling water.
9 and an upstream side of the water pump 14 is connected by a pipe 20. The heater core 3 is provided on the side of the heater core 331 of the heater unit 33.
A bypass path 332 is formed around the heater core 331, and a mix door 333 is provided on the front surface of the heater core 331. The amount of air flowing through the heater core 331 and the bypass path 332 are adjusted by adjusting the opening of the mix door 333. The ratio to the amount of air flowing through the is adjusted. A mixing chamber 334 is formed on the back surface of the heater core 331, and an air outlet 335 is formed in the mixing chamber 334 to communicate with a defrost grill, a vent grill, and a foot grill, respectively.

In particular, in the vehicle heating device 1 of the present embodiment,
As shown in FIG. 1, a pipe 24 is connected in parallel to a cooling water circuit of a water jacket → heater core 331 → water pump 14 of the engine 11.
Is provided with a heat storage tank 21 and a pump 23. A three-way valve 25 is provided at a connection between the pipe 24 and the return pipe 20 for cooling water. Although the structure of the three-way valve 25 is not particularly limited, a three-way valve having a structure shown in FIG. 5 is used in this example. That is, this three-way valve 2
Reference numeral 5 denotes two branched valve bodies 253a and 253.
b are provided with two ball valves 251a and 251b, respectively, and the respective valve ports 252a and 252 are automatically activated by the suction force generated by the operation of the pump 23 or the water pump 14.
52b is closed. For example, when the pump 23 is operated and the water pump 14 is stopped as shown in FIG. 3A, the cooling water from the heater core 321 flows toward the valve body 253a by the suction force of the pump 23, and the ball valve 251a is turned off. While opening the valve port 252a,
Due to this suction force, the ball valve 2 on the valve body 253b side
51b is pulled to the valve port 252b side,
b will be closed. Thereby, the heater core 321
From the valve body 253a → pump 23 →
The heat will flow through the circuit from the heat storage tank 21 to the heater core 321. On the other hand, when the pump 23 is stopped and the water pump 14 is operated as shown in FIG.
4, the ball valve 251b opens the valve port 252b, and the ball valve 251a on the valve body 253a side by the suction force.
Is pulled to the valve port 252a side to close the valve port 252a. As a result, the cooling water from the heater core 321 is supplied from the valve body 253b to the water pump 14
→ Water valve 26 → Flow through heater core 321 circuit.

Further, in this embodiment, a water valve 26 is provided in the pipe 19, and a temperature sensor 27 which detects the temperature of the stored cooling water and sends it to the controller 28 is provided in the heat storage tank 21.

The controller 28 controls the motor of the blower fan 314 of the air conditioner 30, the actuator of the mix door, the pump 23 of the engine cooling system 10, and the actuator of the water valve 26.

Next, the operation will be described. First, FIG. 1 shows an operation state of a mode in which air cooled by the evaporator 321 is mixed with air reheated by the heater core 331 to control the temperature. In this temperature control mode, the water valve 26 is opened,
When the pump 23 is stopped, the heater 22 is also stopped.
In addition, the cooling cycle 322 operates and the compressor 3
The refrigerant flows through the circuit of 23 → condenser 324 → liquid tank 325 → expansion valve → evaporator 321 → compressor 323.

When the engine 11 is operated, cooling water flows in the circuit of the engine 11 → thermostat valve 13 → radiator 12 → water pump 14 by the water pump 14, and at the same time, the engine 11 → heater core 331 → three-way valve 25 → Cooling water flows in the circuit of the water pump 14. The opening degree of the mix door 333 is determined according to the set temperature.
Is cooled by the evaporator 321 and then branched into the heater core 331 and the bypass passage 332 at a ratio corresponding to the degree of opening of the mix door 333, and the air passing through the heater core 331 is reheated while The air that has passed through the bypass 332 reaches the mixing chamber 334 while keeping the cool air, where the two are mixed to supply temperature-controlled air from the outlet 335 to the room.

FIG. 2 shows an operation state when the engine 11 is stopped and heating is required. In this mode, the water valve 26 is closed, the pump 23 is operated, and the heater 22 is also operated. Further, since the engine 11 is stopped, the cooling cycle 322 is also stopped.

The flow of the three-way valve 25 is switched by the operation of the pump 23, and the cooling water stored in the heat storage tank 21 flows through the circuit of the heater core 331 → the three-way valve 25 → the pump 23 → the heat storage tank 21. Further, since the cooling water in the heat storage tank 21 is heated by the heater 22, it is possible to circulate the hot water containing the amount of heat necessary for heating to the heater core 331 even when the engine 11 is stopped. Since the mix door 333 rotates to a position where the bypass passage 332 is completely closed, the intake air taken in from the intake unit 31 passes through the evaporator 321 as it is, and is heated when passing through the heater core 331. As a result, warm air is supplied to the room through the outlet 335.

FIG. 3 shows a cooling operation state when the engine 11 is operating. In this state, the water valve 2
6 is closed, the pump 23 is operated, and the heater 22 is closed.
Stops. Further, the cooling cycle 322 operates, and the compressor 323 → condenser 324 → liquid tank 325 → expansion valve → evaporator 321 → compressor 3
The refrigerant flows in the circuit 23.

When the engine 11 is operated, the cooling water flows through the water pump 14 in the circuit of the engine 11 → thermostat valve 13 → radiator 12 → water pump 14, but since the water valve 26 is closed, the cooling water of this circulation system Does not flow to the heater core 331. Instead, the pump 23 is operated, so that the heat storage tank 21
The cooling water stored in the heater core 331 → three-way valve 2
5 → pump 23 → heat storage tank 21 flows.

Here, the mix door 333 is slightly opened. Thereby, the intake air taken in from the intake unit 31 is cooled by the evaporator 321, and a small amount of the cool air corresponding to the small opening of the mix door 333 passes through the heater core 331. At this time, since the cooling water is flowing through the heater core 331 in the previous circuit, heat exchange is performed between the cooling water and the cooling air, whereby the cooling water is cooled. That is, cold water is stored in the heat storage tank 21. At this time, the temperature of the cooling water in the heat storage tank 21 is monitored by the temperature sensor 27 provided in the heat storage tank 21, and when the temperature of the cooling water drops to a temperature required for cooling, the mix door 33 is returned to the fully closed state. The heater core 33
A small amount of air that has passed through
After being mixed with the air that has passed through 2, the cool air is supplied from the outlet 335 to the room.

FIG. 4 shows an operation state when the engine is stopped from the state shown in FIG. 3 and cooling is required. In this state, the water valve 26 is closed, the pump 23 is operated, and the heater 22 is stopped. Also, Engine 1
Since 1 is stopped, both the cooling cycle 322 and the water pump 14 are stopped.

By the operation of the pump 23, the flow path of the three-way valve 25 becomes as shown in the figure, and the low-temperature cooling water stored in the heat storage tank 21 is supplied from the heater core 331 to the three-way valve 2
5 → pump 23 → heat storage tank 21 flows. Here, the mix door 333 is fully opened, and all the intake air taken in from the intake unit 31 is heated by the heater core 331.
When flowing to the heater core 331, low-temperature cooling water circulates through the heater core 331, so that the heater core 331 functions as a cooler, so that cold air can be continuously supplied to the room even when the engine 11 is stopped.

As described above, in the vehicle heating apparatus 1 of the present embodiment, when the engine 11 is stopped and heating is required, the cooling water in the heat storage tank 21 is heated by the heater 22 and guided to the heater core 331. Cooling water having a sufficient amount of heat is supplied to the heater core 331, whereby the temperature of the cooling water tends to be low (insufficient amount of heat), such as when the engine 11 is warmed up or an engine having a small amount of waste heat. However, sufficient heating performance can be obtained. In addition, since the cooling water in the heat storage tank is cooled during cooling, and the cooling water is circulated to the heater core 331 when the engine is stopped and is used for cooling, it is possible to continuously cool even a vehicle with a high engine stop frequency. Can be.

Second Embodiment FIG. 6 is a block diagram showing another embodiment of a vehicle heating apparatus according to the present invention, FIG. 7 is a flowchart showing a control procedure of the same embodiment, and FIG. It is a figure showing an embodiment.

In this example, the expansion valve 3 of the cooling cycle 322
A refrigerant pipe 327 is branched between the air conditioner 26 and the evaporator 321, a solenoid valve 329 and a heat exchanger 328 are provided, and the refrigerant is returned to the upstream side of the compressor 323. Then, the temperature of the cooling water in the heat storage tank 21 is monitored by the temperature sensor 27, and when the temperature of the cooling water exceeds a predetermined temperature, the solenoid valve 329 is opened. Thereby, the cooling cycle 32
During the operation of the heat exchanger 32, a part of the mist refrigerant, which has been made low-temperature and low-pressure by the expansion valve 326,
8, the cooling water stored in the heat storage tank 21 is cooled. When the temperature of the cooling water in the heat storage tank 21 falls below a predetermined temperature by the temperature sensor 27, the electromagnetic valve 329 is closed.

FIG. 7 is a flowchart showing this control procedure. The normal air conditioning control is started by reading the environmental conditions of the air conditioner 30 (step 1), and when the temperature of the air blown into the room reaches a predetermined temperature (step 1). 2) Since no more refrigerant is necessary for the evaporator 321, the solenoid valve 329 is opened (step 3), and a part of the refrigerant continues to flow to the heat exchanger 328. This is continued until the cooling water in the heat storage tank 21 is cooled to a predetermined temperature by the temperature sensor 27 provided in the heat storage tank 21 (step 4). When the temperature of the cooling water in the heat storage tank 21 drops to a predetermined temperature, the electromagnetic valve 329 is closed, and when a variable displacement compressor is used, the angle of the swash plate is changed to reduce the refrigerant discharge amount ( Step 6).

As described above, in the heating device 1 of the present embodiment,
Since the cooling water in the heat storage tank 21 is directly cooled by using the refrigerant of the cooling cycle 322 as compared with the above-described first embodiment, the temperature rise due to the opening of the mix door 333 is eliminated, and the indoor cooling is reduced. Done more properly.
In addition, since it is not necessary to synchronize with the general control of the mix door 333 in terms of control, the control in the controller 28 is simplified.

When the cooling water in the heat storage tank 21 is cooled using the heat exchanger 328 of the cooling cycle 322, the following control can be performed.

That is, in the cooling cycle 322 of this embodiment, if the refrigerant continues to circulate while the heat load of the evaporator 321 is small, the evaporator 321 freezes.
F to stop the circulation of the refrigerant or, if a variable displacement compressor is used, change the angle of the swash plate to reduce the amount of refrigerant discharged. In this example, the solenoid valve 329 is opened before the clutch is turned off or the angle of the swash plate is changed under such conditions, and a part of the surplus refrigerant flows to the heat exchanger 328 to allow the heat storage tank 21 Cool the cooling water inside. As described above, the sharing of the freeze prevention signal of the evaporator 331 avoids the need for dedicated sensors and complicated control.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

For example, in the second embodiment shown in FIG. 6, the expansion valve 326 of the cooling cycle 322 is desirably provided in the immediate vicinity of the evaporator 321.
In the case where the branch to the pipe 8 must be made upstream of the expansion valve 326, a heat exchanger 328 in which a tubular heat exchanger and expansion means such as a capillary tube are integrated as shown in FIG. 8 is employed. Is preferred.

[0044]

As described above, according to the present invention, long-time heating can be continuously performed even with a small-capacity heat storage tank. In addition, even if the vehicle is equipped with a low-heat engine such as a high-efficiency engine or a diesel engine, and the outside temperature is low, sufficient heat can be supplied to the cooling water to ensure heating performance. Can be.

Further, when the internal combustion engine is stopped and in the cooling mode, the cooling water in the cooled heat storage tank is utilized and circulated through the heater core to cool the intake air by the heater core. Even if the cooling cycle is stopped and the cooling cycle is stopped, the cooling can be continuously performed, and it can be mounted on an idle stop car or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram (at the time of temperature control) showing an embodiment of a vehicle heating device of the present invention.

FIG. 2 is a block diagram (at the time of engine stop and heating) showing an embodiment of the vehicle heating device of the present invention.

FIG. 3 is a block diagram (during cooling operation) of the vehicle heating device according to the embodiment of the present invention.

FIG. 4 is a block diagram (at the time of engine stop and cooling) showing an embodiment of the vehicle heating device of the present invention.

FIG. 5 is a conceptual diagram showing an embodiment of a three-way valve of the vehicle heating device of the present invention.

FIG. 6 is a block diagram showing another embodiment of the vehicle heating device of the present invention.

FIG. 7 is a flowchart showing a control procedure of the embodiment shown in FIG.

FIG. 8 is a conceptual diagram showing another embodiment of the heat exchanger of the vehicle heating device shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vehicle heating apparatus 10 ... Engine cooling system 11 ... Engine 12 ... Radiator 13 ... Thermostat valve 14 ... Water pump 15-19 ... Piping 21 ... Heat storage tank 22 ... Heater (heating means) 23 ... Pump 24 ... Piping 25 ... Three-way valve 26 Water valve 30 Air conditioner 322 Cooling cycle 328 Heat exchanger 331 Heater core

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F01P 3/20 F01P 3/20 H

Claims (6)

[Claims] 1. A vehicle heating device for circulating a part of a cooling medium of a cooling system of an internal combustion engine to a heater core, wherein a sub-cooling water is provided in parallel with a cooling water circuit composed of the internal combustion engine and the heater core. A circuit; a heat storage tank provided in the sub-cooling water circuit; a pump provided in the sub-cooling water circuit; a heating means provided in the heat storage tank and heating cooling water in the heat storage tank; A heating device for a vehicle, comprising: an on-off valve for stopping cooling water flowing from an engine toward the heater core; and a flow direction switching valve for switching between the cooling water circuit and the sub-cooling water circuit. 2. A vehicle heating apparatus according to claim 1, wherein when the internal combustion engine is stopped and in a heating mode, the cooling medium in the heat storage tank is heated by the heating means and circulated to the heater core. 3. A cooling unit including a cooling cycle, wherein when the internal combustion engine is operating and in a cooling mode, cooling water in the heat storage tank is circulated to the heater core in the cooling water circuit. 3. The vehicle heating device according to claim 1, wherein a part of the air cooled by the evaporator of the cooling cycle is guided to the heater core. 4. The vehicle heating apparatus according to claim 3, wherein when the internal combustion engine is stopped and in a cooling mode, cooling water in the heat storage tank is circulated to the heater core, and intake air is cooled by the heater core. 5. A heat exchange unit further comprising a cooler unit including a cooling cycle, wherein a part of the refrigerant of the cooling cycle is provided in the heat storage tank and exchanges heat with cooling water in the heat storage tank. The vehicle heating device according to claim 1, which is circulated through a vessel. 6. When the cooling cycle is in operation, a part of the refrigerant is circulated to the heat exchanger to cool the cooling water in the heat storage tank, and when the internal combustion engine is stopped and in the cooling mode, The vehicle heating device according to claim 5, wherein cooling water in the heat storage tank is circulated to the heater core, and intake air is cooled by the heater core.