JP2000062450A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an air conditioning heat load by effectively using air discharged after compartment air conditioning conventionally discarded wastefully. SOLUTION: This air conditioner is provided with a heat generation device 10, and a coolant circuit having a water feeding means 13 for connecting a first heat exchangers 11 with a second heat exchanger 12 by a pipe and distributing coolants into the pipe. The first heat exchanger 11 is provided in a ventilation port for discharging air conditioning air after the completion of compartment air-conditioning, and the second heat exchanger 12 is provided in the upstream side of an evaporator 1. Further, a switching valve 14 is provided in the exit side of the water feeding means 13, and a circuit is provided for circulating coolants between the first heat exchanger 11 and the heat regeneration device 10 by the switching valve 14 with no coolant distributing to the second heat exchanger 12.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a vehicle air conditioner.

[0002]

2. Description of the Related Art As a conventional device for reducing the heat load of air conditioning, there is a device having a structure as shown in FIG. 3, as disclosed in, for example, Japanese Patent Laid-Open No. 6-156062.
A cold storage heat type air conditioner 101 according to this conventional technique includes a heat pump type air conditioning system 102, a cold storage heat type air conditioning system 103, and a system 104 for controlling the operations thereof.
The determination circuit 105 compares the outside air temperature T detected by the outside air temperature detection sensor 106 with the temperatures T ₁ and T ₂ , determines that T> T ₁ should be stored, and T <T ₂
When T ₂ ≦ T ≦ T ₁ , it is determined that cold or heat should be stored depending on the mode of the four-way valve 107, and the determination result is output to the operation control amplifier 108.
With such a configuration, it is possible to appropriately and automatically store heat or cool.

[0003]

However, in such a conventional cold storage heat type air conditioner, in order to store cold, the air conditioning evaporator outlet conditioned air must be used, and the compressor 109 is additionally provided. There was a problem that it had to be activated.

The present invention has been made by paying attention to such a conventional problem, and it is possible to effectively use the exhaust air after the air conditioning of the passenger compartment, which was conventionally wastefully discarded, to reduce the heat load of the air conditioning. It is an object of the present invention to provide a vehicle air conditioner capable of performing the above.

[0005]

In order to solve the above-mentioned problems, the present invention connects a regenerator material and first and second heat exchangers with a pipe and causes a refrigerant to flow through the pipe. While providing a refrigerant circuit with water supply means, the first heat exchanger,
Provided in the ventilation port for discharging the air conditioning exhaust air after completing the air conditioning of the vehicle compartment, the second heat exchanger is arranged on the upstream side of the evaporator, and further, a switching valve is provided on the outlet side of the water feeding means, The switching valve is configured to form a circuit in which the refrigerant is circulated between the first heat exchanger and the regenerator material and not circulated in the second heat exchanger.

The operation of the present invention will be described below. According to the present invention, it is determined that there is a surplus in the cooling power of the air conditioning, and the air conditioning exhausted air from the vehicle compartment or the circulating air in the vehicle interior is effectively used to store the cold storage, and when the air conditioning load is required, the cold storage is performed. Since the air-conditioning air inlet air temperature can be controlled by the applied cooling power, the air-conditioning load can be reduced without wasting power.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a vehicle air conditioner according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram showing an embodiment of a vehicle air conditioner according to the present invention.

First, the structure will be described. Reference numeral 1 is an evaporator, and the compressor 2, the condenser 3, the liquid tank 4, and the expansion valve 5 constitute an air conditioning cycle. 6 is an air-conditioning blower that removes air outside or inside the vehicle
Select with the damper 7 to ventilate the evaporator 1 and
Is air-conditioned. The exhaust air that has air-conditioned the passenger compartment 8
When the damper 7 selects the vehicle compartment side, it becomes a so-called internal air circulation path that is again sucked by the air conditioning blower 6 to air-condition the vehicle interior. When the damper 7 selects the vehicle exterior side, the air conditioning is performed. It is a so-called outside air introduction path that is discharged to the trunk room and the outside of the vehicle through the wind outlet 9.

Here, the regenerator 10 containing a regenerator material
And a first heat exchanger 11 provided at the air conditioning air outlet 9,
A second heat exchanger 12 provided on the inlet side of the evaporator 1 is connected by a refrigerant pipe, and water is supplied to each part by a water supply means 13. Further, a switching valve 14 is provided so that it can be switched to a path (direction B) in which only the first heat exchanger 11 and the regenerator 10 are circulated.

Control unit 1 for switching the water passage
5, the signals of the second heat exchanger inlet air temperature sensor 16, the air conditioning exhaust air temperature sensor 17, the air conditioning outlet air temperature 18 and the cold storage material temperature 19 are input, and the water supply means 13 and the switching valve 14 are provided. Are in control.

Next, the operation of this embodiment will be described. A flowchart of the operation is shown in FIG. When the system is started, first, the difference between the air conditioning outlet air temperature 18 and the set temperature is checked (step S1).

When the air-conditioning outlet air temperature 18 is higher than the set temperature (step S1, Yes), the maximum air-conditioning load such as cooldown is required, and the following conditions are judged to determine the cool storage device. Utilize the cold power of 10.

First, the second heat exchanger inlet air temperature 16 and the regenerator material temperature 19 are checked (step S2). If the former is higher (step S2, Yes), the water supply means 13 is operated and the switching valve 14 is turned on. In the A direction (step S3), the refrigerant is circulated between the second heat exchanger 12 and the regenerator 10.
As a result, the heat is recovered by the second heat exchanger 12, the inlet air temperature of the evaporator 1 is lowered, and the air conditioning load is reduced.

On the other hand, in step S2, when the cold storage material temperature 19 is higher (step S2, No), it is determined that the cold storage is insufficient, the water supply means 13 is stopped (step S4), and circulation is performed. Absent.

Next, in step S1, when the air conditioning outlet air temperature 18 is lower than the set temperature (step S1, No), it is an area where there is a margin in air conditioning performance such as a steady state. In this case, the cool storage device 1 is used by utilizing the surplus cooling power.
Keep 0 cooled.

First, it is determined whether the damper 7 is on the inside air circulation side or the outside air introduction side (step S5). In the outside air introduction, it is judged that the air conditioning exhaust air temperature 17 is lower than or equal to the cold storage material temperature 19 (step S6, No), the switching valve 14 is turned to the B direction and the water supply means 13 is operated (step S7), and the cold storage device. A refrigerant is circulated between 10 and the first heat exchanger 11.
As a result, the exhaust air discharged from the exhaust port 9 after the air conditioning is finished radiates heat from the first heat exchanger 11 to cool the regenerator 10.

On the other hand, in step S6, when the air conditioning exhaust air temperature 17 is equal to or higher than the cold storage material temperature 19 (step S6).
6, Yes), the cold water storage device 10 is sufficiently cold and it is not necessary to further cool it, and the water supply means 13 is not operated (step S8).

In the case of introducing the outside air, the air conditioning exhaust air is exhausted to the outside air, so that radiating heat by the first heat exchanger 11 does not adversely affect the air conditioning load. However, in step S5, when it is determined that the inside air circulation is present, it is necessary to determine and control both load states.

First, the second heat exchanger inlet air temperature 16 and the cold storage material temperature 19 are monitored (step S9). If the former is higher (step S9, Yes), the cold storage of the cold storage device 10 is sufficient. As a result, the water supply means 13 is not operated (step S10).

On the other hand, when the second heat exchanger inlet air temperature 16 is lower than the regenerator material temperature 19 in step S9 (No in step S9), there is a possibility that the regenerator can store heat. However, excessive storage of cold impedes reduction of air conditioning load. Therefore, if the vehicle speed is equal to or higher than a certain prescribed value (Vo) and the accelerator is off (step S11,
Yes), watering means 1 is determined to be coasting
3 to operate the switching valve 14 in the A direction (step S1
2) The refrigerant is circulated between the second heat exchanger 12 and the regenerator 10. In this case, since deceleration energy is used, fuel consumption does not deteriorate due to the air conditioning load.

If it is determined in step S11 that it is not during deceleration (step S11, No), the water supply means 13 is not operated (step S10).

[0022]

As described above in detail, according to the present invention, the regenerator material and the first and second heat exchangers are connected by a pipe, and the water is made to flow through the refrigerant in the pipe. With a refrigerant circuit having means, the first heat exchanger is provided at the ventilation port for discharging the air conditioning exhaust air after the air conditioning of the vehicle interior is completed, and the second heat exchanger is provided on the upstream side of the evaporator. Furthermore, a switching valve is provided on the outlet side of the water supply means, and the switching valve allows the refrigerant to circulate between the first heat exchanger and the regenerator material and does not flow to the second heat exchanger. Since it is configured to form such a circuit, the cool storage device is cooled using the conditioned cold air discharged from the vehicle compartment, and when the cooling power of the air conditioning system is required to the maximum such as cool down,
The second heat exchanger absorbs heat to reduce the evaporator inlet air temperature, and the air conditioner load can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of a vehicle air conditioner according to the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment of the vehicle air conditioner according to the present invention.

FIG. 3 is a diagram showing a configuration of a cold storage heat type air conditioner according to a conventional technique.

[Explanation of symbols]

1 evaporator 2 compressor 3 capacitors 4 liquid tanks 5 expansion valve 6 Air conditioning blower 7 damper 8 passenger compartment 9 Air conditioning air outlet 10 Regenerator 11 First heat exchanger 12 Second heat exchanger 13 Water supply means 14 Switching valve 15 Control unit 16 Second heat exchanger inlet air temperature 17 Air conditioning exhaust air temperature 18 Air conditioning outlet air temperature 19 Cold storage material temperature

Claims (4)

[Claims] 1. An evaporator whose temperature is controlled to a low temperature by an air-conditioner cycle, and which ventilates the evaporator,
In a vehicle air conditioner provided with a ventilation means for blowing the obtained cold air into a vehicle compartment, a cold storage material and first and second heat exchangers are connected by a pipe to allow a refrigerant to flow through the pipe. With the provision of a refrigerant circuit having water supply means, the first heat exchanger is provided at a ventilation port for discharging the air conditioning exhaust air after the air conditioning of the vehicle interior is completed, and the second heat exchanger is the An air conditioner for a vehicle, which is arranged on the upstream side of an evaporator. 2. The vehicle air conditioner according to claim 1, wherein a switching valve is provided on the outlet side of the water supply means, and the switching valve causes a refrigerant to flow between the first heat exchanger and the regenerator material. The air conditioner for a vehicle, characterized in that a circuit is formed so that the air is circulated and is not circulated in the second heat exchanger. 3. The vehicle air conditioner according to claim 2, wherein the first heat exchanger inlet air temperature, the second heat exchanger inlet air temperature, the air conditioning outlet temperature, and the cold storage material temperature are respectively monitored. The outlet temperature is below the target air conditioning temperature, and
When the vehicle compartment air conditioning is in the outside air introduction mode and the first heat exchanger inlet air temperature is lower than the regenerator temperature,
The switching valve shuts off communication with the second heat exchanger and activates the water supply means to cool the regenerator by circulating the refrigerant between the regenerator and the first heat exchanger. When the cool storage mode is entered and the inside air circulation mode is entered, the second heat exchanger inlet air temperature is equal to or lower than the cool storage material temperature, and the vehicle is in a decelerating state at the vehicle speed and the accelerator opening degree. The air conditioner for a vehicle, characterized in that the switching valve is switched to enter a cold storage mode in which a refrigerant is circulated between the second heat exchanger and the cold storage device to perform cold storage. 4. The vehicle air conditioner according to claim 3, wherein the air conditioning outlet temperature is equal to or higher than a target air conditioning temperature, and the second heat exchanger inlet air temperature is equal to or higher than the cold storage material temperature. In this case, the switching valve communicates the regenerator material with the second heat exchanger to activate the water supply means, and the cooling force of the regenerator reduces the evaporator inlet air temperature. A vehicle air conditioner characterized by the above.