KR20230174831A - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to an air conditioning system for vehicles. The purpose of the present invention is to enable refrigerant leakage within a device and the lack of a refrigerant amount caused thereby to be checked using simple manipulations alone without separate measuring equipment and the withdrawal of the refrigerant to the outside. In order to achieve the purpose, the present invention provides an air conditioning system for vehicles, which includes a refrigerant circulation line having a compressor, a high-pressure-side heat exchanger, a high-pressure-side expansion valve, an outdoor heat exchanger, a low-pressure-side expansion valve and a low-pressure-side heat exchanger, comprising: a refrigerant leakage checking key button part capable of setting a mode for checking the refrigerant leak of the air conditioning system; and a control part for, when the mode of checking refrigerant leakage is set by the refrigerant leakage checking key button part, controlling the state of the air conditioning system in preset specific conditions while entering into the mode of checking refrigerant leakage, and then processing one or more refrigerant leakage-affected factors, which are affected by refrigerant leakage in the air conditioning system in the state of the air conditioning system with the specific conditions, using an embedded refrigerant leakage determining logic, thereby determining whether refrigerant leaks in the air conditioning system.

Description

Vehicle air conditioning system {AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES}

The present invention relates to an air conditioning device for a vehicle, and more specifically, to an air conditioning device for a vehicle that can check refrigerant leakage within the device and a shortage of refrigerant through simple operation without separate measuring equipment or external withdrawal of refrigerant. .

A vehicle's air conditioning system cools the interior of the vehicle by generating cold air during the process of compression, condensation, expansion, and evaporation of the refrigerant. It is important to maintain the amount of refrigerant in the device at an optimal level.

If the amount of refrigerant in the air conditioner is insufficient or excessive, the degree of superheating of the refrigerant on the evaporator side becomes unstable, and the cooling performance of the air conditioner significantly deteriorates.

In particular, the pressure inside the device is very high, and refrigerant leaks little by little from various joints of the refrigerant pipe. This leakage of refrigerant causes a shortage of refrigerant inside the device.

In addition, the shortcoming of this lack of refrigerant is that the performance and efficiency of air conditioning devices are reduced.

In particular, a problem has been pointed out that due to a lack of refrigerant in the device, the cooling capacity of the evaporator rapidly decreases, which significantly reduces the cooling effect in the vehicle interior and even causes problems with the stability of the compressor.

Meanwhile, taking this into consideration, the amount of refrigerant in the air conditioning device is periodically checked to check for leaks of the refrigerant in the device and the resulting shortage of refrigerant.

However, it has the disadvantage of requiring a lot of time and manpower to check the amount of refrigerant in the air conditioning device.

In particular, in order to check the amount of refrigerant in the air conditioner, the entire refrigerant in the air conditioner is withdrawn to the outside using a separate refrigerant amount measuring device, then the weight of the withdrawn refrigerant is measured, and the measured refrigerant is returned into the air conditioner. It must be brought in.

Therefore, there is a drawback that a lot of time and manpower are required, and thus the efficiency of work is significantly reduced.

The present invention was devised to solve the above-described conventional problems, and its purpose is to check refrigerant leakage within the device and the lack of refrigerant amount through simple operation without separate measuring equipment and external withdrawal of refrigerant. The goal is to provide air conditioning systems for vehicles.

Another object of the present invention is to quickly respond to refrigerant leaks and refrigerant amount shortages by configuring the device to check refrigerant leaks and refrigerant amount shortages with a simple operation without separate measuring equipment and external withdrawal of refrigerant. This is to prevent cooling performance from deteriorating.

In order to achieve this purpose, the vehicle air conditioning device according to the present invention includes a refrigerant circulation line including a compressor, a high pressure side heat exchanger, a high pressure side expansion valve, an outdoor heat exchanger, a low pressure side expansion valve, and a low pressure side heat exchanger. , a refrigerant leak confirmation key button unit capable of setting a mode for checking refrigerant leak of the air conditioning device; When setting the refrigerant leak check using the refrigerant leak check key button, entering the refrigerant leak check mode and controlling the state of the air conditioning device to a preset specific condition, then refrigerant leakage in the air conditioning device under the air conditioner state of the specific condition. It is characterized by including a control unit that determines whether there is a refrigerant leak of the air conditioning device by processing one or more refrigerant leak influencing factors affected by a pre-built refrigerant leak determination logic.

And, when entering the refrigerant leak confirmation mode, the control unit completely closes the high-pressure side expansion valve to block refrigerant between the upstream and downstream sides of the high-pressure side expansion valve; After a preset time has elapsed, the change in refrigerant pressure in the refrigerant circulation line due to refrigerant blocking between the upstream and downstream sides of the high-pressure expansion valve is treated as a refrigerant leak influence factor and processed by the pre-built refrigerant leak detection logic to determine the condition of the air conditioning device. It is characterized by determining whether there is a refrigerant leak.

And when the control unit enters the refrigerant leak confirmation mode, it blocks the refrigerant between the upstream and downstream sides of the high-pressure side expansion valve, so that the refrigerant on the refrigerant circulation line between the upstream side of the high-pressure side expansion valve and the compressor is high-pressure. so that a negative pressure is formed in the refrigerant on the refrigerant circulation line side between the downstream side of the high-pressure side expansion valve and the compressor; After a preset time has elapsed, the size of the detected refrigerant pressure of the negative pressure detected between the downstream side of the high-pressure expansion valve and the compressor is compared with the size of the pre-built reference refrigerant pressure, and whether or not there is a refrigerant leak from the air conditioning device according to the results. It is characterized by determining .

And the control unit is built in to set the reference refrigerant pressure to a negative value; If the detected refrigerant pressure of the negative pressure is higher than the reference refrigerant pressure, it is determined that the refrigerant of the current air conditioning device is leaking; If the detected refrigerant pressure of the negative pressure is less than the reference refrigerant pressure, it is determined that the refrigerant of the current air conditioning device is not leaking.

In addition, when entering the refrigerant leak detection mode, the control unit completely closes the high-pressure side expansion valve and controls the rotation speed of the compressor to a preset minimum rotation speed.

And, it is characterized in that it further includes a refrigerant leak notification unit that informs whether the refrigerant is leaking from the air conditioning device according to the control of the control unit.

According to the vehicle air conditioning system according to the present invention, after the high pressure side expansion valve is completely closed, refrigerant leakage in the air conditioner is determined through the size of the negative pressure of the refrigerant between the downstream side of the high pressure side expansion valve and the suction side of the compressor. , it is effective in checking refrigerant leakage within the device and the lack of refrigerant amount through simple operation without separate measuring equipment or external withdrawal of refrigerant.

In addition, refrigerant leaks and refrigerant shortages can be confirmed within the device with a simple operation without separate measuring equipment or external withdrawal of refrigerant, so you can quickly respond to refrigerant leaks and refrigerant shortages and prevent cooling performance from deteriorating due to refrigerant leaks. There is an effect that can be done.

1 is a diagram showing the configuration of a vehicle air conditioning system according to the present invention;
Figure 2 is a diagram showing a controller for controlling an air conditioning system on which a refrigerant leak confirmation key button unit constituting the vehicle air conditioning system of the present invention is installed;
3 is a diagram showing a refrigerant leak notification unit constituting the vehicle air conditioning system of the present invention;
Figure 4 is a flow chart showing an operation example of the vehicle air conditioning system according to the present invention.

Hereinafter, a preferred embodiment of a vehicle air conditioning system according to the present invention will be described in detail based on the attached drawings.

First, before looking at the features of the vehicle air conditioning device according to the present invention, the vehicle air conditioning device 10 will be briefly described with reference to FIG. 1.

The vehicle air conditioning device 10 is a heat pump type and includes a refrigerant circulation line 12.

The refrigerant circulation line 12 includes a compressor 12a, a high-pressure side heat exchanger 12b, a high-pressure side expansion valve 12c, an outdoor heat exchanger 12d, and a plurality of low-pressure side expansion valves installed in parallel with each other ( 12e) and low-pressure side heat exchangers (12f) installed on the downstream side of each low-pressure side expansion valve (12e).

This refrigerant circulation line 12 completely opens the high-pressure side expansion valve 12c in the air conditioner mode, so that the refrigerant in the compressor 12a is not decompressed or expanded by the high-pressure side expansion valve 12c, and the high-pressure side expansion valve 12c is not decompressed or expanded. It allows circulation in the following order: heat exchanger (12b) → outdoor heat exchanger (12d) → low pressure side expansion valve (12e) → low pressure side heat exchanger (12f) → compressor (12a).

And, through this refrigerant circulation, low-temperature cold air is generated in the low-pressure side heat exchangers (12f), and the generated cold air is delivered to the air conditioning area of the vehicle, for example, inside the vehicle and on the battery (B) side. Therefore, the vehicle interior and battery (B) are cooled.

In addition, in the heat pump mode, the high-pressure side expansion valve (12c) is turned on to allow decompression and expansion of the refrigerant, so that the refrigerant in the compressor (12a) flows from the high-pressure side heat exchanger (12b) to the high-pressure side expansion valve ( It allows circulation in the following order: 12c) → outdoor heat exchanger (12d) → compressor (12a).

And through this refrigerant circulation, the heat generated in the high-pressure side heat exchanger (12b) is supplied to the vehicle interior to heat it.

Here, the high-pressure side expansion valve 12c is an electronic expansion valve (EXV), and its opening amount is configured to vary depending on the degree of superheat of the refrigerant on the discharge side of the outdoor heat exchanger 12d in heat pump mode.

In particular, the high pressure side expansion valve (12c) controls the refrigerant calculated based on the refrigerant pressure and temperature of the PT sensor (14) installed between the discharge side of the outdoor heat exchanger (12d) and the suction side of the compressor (12a). The opening amount is configured to vary depending on the degree of superheat.

Next, the features of the vehicle air conditioning system according to the present invention will be examined in detail with reference to FIGS. 1 and 3.

First, referring to FIG. 1, the air conditioning device of the present invention includes a refrigerant leak check key button unit 20.

The refrigerant leak confirmation key button unit 20 is used to set the refrigerant leak confirmation of the air conditioning device, and as shown in FIG. 2, it consists of a button switch 32 installed on the front of the controller 30 for controlling the air conditioning device. do.

This refrigerant leak confirmation key button unit 20 is configured to output a refrigerant leak confirmation signal S1 when the user presses and operates it.

Here, the refrigerant leak confirmation key button unit 20 may be composed of a plurality of specific switch key combinations of the controller 30 for controlling the air conditioning system. In this case, when a plurality of switches are operated with a preset key combination, a refrigerant leak confirmation signal (S1) is output.

In addition, the air conditioning device of the present invention includes a refrigerant pressure detection unit 22 installed in the refrigerant circulation line 12 between the downstream side of the high-pressure expansion valve 12c and the suction side of the compressor 12a. .

The refrigerant pressure sensor 22 is a pressure sensor that detects the refrigerant pressure on the refrigerant circulation line 12 between the downstream side of the high-pressure expansion valve 12c and the suction side of the compressor 12a. The refrigerant pressure is input to the control unit 40, which will be described later.

This refrigerant pressure detection unit 22 serves to detect the refrigerant pressure in the refrigerant circulation line 12, which is a factor affecting the refrigerant leak, when the refrigerant leaks from the air conditioning device.

Here, the refrigerant pressure sensing unit 22 is located on the suction side of the compressor 12a as much as possible among the portion of the refrigerant circulation line 12 between the downstream side of the high-pressure side expansion valve 12c and the suction side of the compressor 12a. It is desirable to install it in a part.

The refrigerant pressure detection unit 22 preferably uses an existing PT sensor 14 installed between the discharge side of the outdoor heat exchanger 12d and the suction side of the compressor 12a.

Referring again to FIG. 1, the air conditioning device of the present invention includes a control unit 40.

The control unit 40 is equipped with a microprocessor and is configured to control the air conditioning device to specific conditions for checking the refrigerant leak when the refrigerant leak confirmation signal (S1) is input from the refrigerant leak confirmation key button unit 20. do.

That is, when the refrigerant leak confirmation signal (S1) is input from the refrigerant leak confirmation key button unit 20, the control unit 40 determines that the user wishes to check the refrigerant leak of the current air conditioning device, and enters the refrigerant leak confirmation mode. Enter (42).

Then, the control unit 40, which has entered the refrigerant leak check mode 42, controls the state of the air conditioning device for a preset time according to preset conditions, creating specific conditions suitable for refrigerant leak check.

For example, for a preset time, for example, 1 minute, the high pressure side expansion valve 12c of the refrigerant circulation line 12 is completely closed, and the rotation speed of the compressor 12a is controlled to the preset minimum rotation speed.

Therefore, based on the high-pressure side expansion valve 12c, high pressure is formed in the refrigerant between the upstream side of the high-pressure side expansion valve 12c and the discharge side of the compressor 12a, and the downstream side of the high-pressure side expansion valve 12c The refrigerant between the side and the suction side of the compressor 12a allows negative pressure (vacuum pressure) to be formed.

Here, when entering the refrigerant leak confirmation mode 42, the control unit 40 switches the blower (not shown), the intake door, and each mode door to Auto Mode. ) It is desirable to control it in the state.

In addition, when entering the refrigerant leak detection mode 42, the control unit 40 preferably completely closes the high-pressure side expansion valve 12c and controls the air conditioning device 10 in the heat pump mode.

Meanwhile, the control unit 40 detects the refrigerant pressure detection unit 22, which is a refrigerant leak influence factor, when a preset time has elapsed, for example, 1 minute, under specific conditions of the air conditioning device for checking refrigerant leakage. The detected refrigerant pressure is processed by a pre-built refrigerant leak detection logic to determine refrigerant leaks from the air conditioning system.

To explain this in more detail, when one minute has elapsed after entering the refrigerant leak confirmation mode 42, the control unit 40 determines the detected refrigerant pressure detected by the refrigerant pressure detection unit 22 and the pre-built standard. Compare and analyze refrigerant pressure.

At this time, the refrigerant on the refrigerant circulation line 12 side between the downstream side of the high-pressure side expansion valve 12c detected by the refrigerant pressure detection unit 22 and the suction side of the compressor 12a forms negative pressure.

And the control unit 40 compares the detected refrigerant pressure of the negative pressure detected by the refrigerant pressure detection unit 22 with a pre-built reference refrigerant pressure.

In particular, the reference refrigerant pressure is built-in as a negative value, and the detected refrigerant pressure of the negative pressure detected by the refrigerant pressure detection unit 22 is compared and processed to process the reference refrigerant pressure of the built-in negative value. Determine whether or not the refrigerant pressure is above this standard.

As a result of the determination, if the detected refrigerant pressure of the refrigerant pressure detection unit 22 is higher than the reference refrigerant pressure, the control unit 40 determines that the refrigerant is currently leaking from the side of the refrigerant circulation line 12, and the high pressure side expansion valve It is determined that the refrigerant pressure between the downstream side of (12c) and the suction side of the compressor (12a) does not form a negative pressure lower than the reference refrigerant pressure.

In particular, refrigerant leaks from the portion on the refrigerant circulation line 12 side between the downstream side of the high-pressure side expansion valve 12c and the suction side of the compressor 12a, and the refrigerant on the refrigerant circulation line 12 side becomes the reference refrigerant. It is judged that a low negative pressure below pressure is not formed.

On the contrary, when the detected refrigerant pressure of the refrigerant pressure detection unit 22 is lower than the reference refrigerant pressure, the control unit 40 detects that there is no refrigerant leak from the refrigerant circulation line 12 side, so the high pressure side expansion valve It is determined that the refrigerant pressure between the downstream side of (12c) and the suction side of compressor (12a) forms a low negative pressure below the reference refrigerant pressure.

Ultimately, the control unit 40 completely closes the high-pressure side expansion valve 12c, blocking the refrigerant between the upstream and downstream sides of the high-pressure side expansion valve 12c, and the upstream and downstream sides of the high-pressure side expansion valve 12c. The refrigerant pressure change in the refrigerant circulation line 12 due to refrigerant blocking between sides is used as a refrigerant leak influencing factor to determine refrigerant leakage from the air conditioning device.

In particular, refrigerant leakage from the air conditioning device is determined through the size of the negative pressure of the refrigerant between the downstream side of the high-pressure side expansion valve 12c and the suction side of the compressor 12a, which is generated when the high-pressure side expansion valve 12c is completely closed.

Referring again to FIG. 1, the air conditioning device of the present invention further includes a refrigerant leak notification unit 50 that notifies the air conditioning device whether there is a refrigerant leak under the control of the control unit 40.

As shown in FIG. 2, the refrigerant leak notification unit 50 is composed of the display unit 34 of the controller 30 for controlling the air conditioning system.

As shown in FIG. 3, the display unit 34 of the controller 30 is equipped with a refrigerant leak display unit 34a and a refrigerant normal display unit 34b.

The display unit 34 of the controller 30 lights up at least one of the refrigerant leak display unit 34a and the refrigerant normal display unit 34b according to the control of the control unit 40. Therefore, it informs the user whether there is a refrigerant leak from the air conditioning device.

In particular, when a refrigerant leak signal is input from the control unit 40, the refrigerant leak display unit 34a lights up in response. Therefore, it informs the user that refrigerant is currently leaking within the air conditioning device.

Additionally, when a refrigerant normal signal is input from the control unit 40, the refrigerant normal display unit 34b lights up in response. Therefore, it informs the user that there is currently no refrigerant leak within the air conditioning device.

Here, the letters and symbols of the refrigerant leak display unit 34a and the refrigerant normal display unit 34b of the display unit 34 change when the user presses the refrigerant leak check key button unit 20 to enter the refrigerant leak check mode. It is configured to be displayed on the display unit 34.

Preferably, when entering the refrigerant leak confirmation mode, all displays other than the refrigerant leak display unit 34a and the refrigerant normal display unit 34b are deleted from the display unit 34.

Referring again to FIGS. 1 to 3, in the air conditioning device of the present invention, when the refrigerant leak confirmation key button unit 20 of the controller 30 for controlling the air conditioning device is re-operated while entering the refrigerant leak confirmation mode, the The control unit 40 is released from the refrigerant leak confirmation mode.

And the control unit 40, which is released from the refrigerant leak confirmation mode, displays all states of the high-pressure side expansion valve 12c, the compressor 12a, the display unit 34 of the controller 30 for controlling the air conditioner, and the air conditioner. Restore to the state before entering leak confirmation mode.

In particular, in the case of the display unit 34, the refrigerant leak display unit 34a and the refrigerant normal display unit 34b are deleted, and the remaining display units are restored to their original state. Accordingly, the refrigerant leak confirmation of the air conditioning device is completed.

Next, an operational example of the present invention having the above configuration will be described with reference to FIGS. 1 to 4.

First, referring to FIG. 4, the user inputs a refrigerant leak confirmation signal (S1) by pressing the refrigerant leak confirmation key button portion (20) of the controller (30) (S101).

Then, the control unit 40 determines that the user wishes to check the refrigerant leak of the air conditioning device and enters the refrigerant leak check mode (S103).

Then, the control unit 40, which has entered the refrigerant quantity confirmation mode, controls the state of the air conditioning device to a preset specific mode condition (S105).

For example, the high-pressure side expansion valve 12c is completely closed and blocked, and the rotation speed of the compressor 12a is controlled to the minimum rotation speed (see Figure 1).

Meanwhile, with the air conditioning device controlled under specific mode conditions, the control unit 40 determines whether a preset time has elapsed (S107). For example, determine whether 1 minute has elapsed.

As a result of the determination, if 1 minute has elapsed, the control unit 40 determines again whether the detected refrigerant pressure of the negative pressure detected by the refrigerant pressure detection unit 22 is higher than the pre-built reference refrigerant pressure (S109).

As a result of the determination, if the detected refrigerant pressure is higher than the reference refrigerant pressure, the control unit 40 determines that the refrigerant between the downstream side of the high-pressure side expansion valve 12c and the suction side of the compressor 12a has a low negative pressure below the reference refrigerant pressure. Since it is not forming, it is determined that the refrigerant is currently leaking from the side of the refrigerant circulation line (12) (S111).

And according to this judgment, the control unit 40 turns on the refrigerant leak indicator unit 34a on the display unit 34 of the air conditioning device control controller 30 to indicate that refrigerant is leaking from the air conditioning device (S113) .

Meanwhile, as a result of the determination in step (S109), if the sensed refrigerant pressure is not higher than the reference refrigerant pressure (S109-1), that is, if the sensed refrigerant pressure is less than the reference refrigerant pressure, the control unit 40 operates the high-pressure side expansion valve. Since the refrigerant pressure between the downstream side of (12c) and the suction side of compressor (12a) forms a low negative pressure below the reference refrigerant pressure, it is determined that there is currently no refrigerant leak from the side of the refrigerant circulation line (12) ( S115).

And according to this judgment, the control unit 40 turns on the refrigerant normal display unit 34b on the display unit 34 of the air conditioning device control controller 30 to indicate that the refrigerant is not leaking from the air conditioning device (S117) ).

According to the air conditioning device of the present invention having such a configuration, after completely closing the high-pressure side expansion valve (12c), the size of the negative pressure of the refrigerant between the downstream side of the high-pressure side expansion valve (12c) and the suction side of the compressor (12a) is used. Since it is a structure that determines refrigerant leakage within the air conditioning device, it is possible to check refrigerant leakage within the device and the lack of refrigerant amount through simple operation without separate measuring equipment or external withdrawal of refrigerant.

In addition, refrigerant leaks and refrigerant shortages can be confirmed within the device with a simple operation without separate measuring equipment or external withdrawal of refrigerant, so you can quickly respond to refrigerant leaks and refrigerant shortages and prevent cooling performance from deteriorating due to refrigerant leaks. can do.

In the above, preferred embodiments of the present invention have been described by way of example, but the scope of the present invention is not limited to these specific embodiments, and may be appropriately modified within the scope stated in the claims.

10: Air conditioning device 12: Refrigerant circulation line (Line)
12a: Compressor 12b: High pressure side heat exchanger
12c: High pressure side expansion valve 12d: Outdoor heat exchanger
12e: low pressure side expansion valve 12f: low pressure side heat exchanger
14: 1st PT sensor (Sensor) 20: Refrigerant leak confirmation key button part
22: Refrigerant pressure detection unit
30: Controller for controlling air conditioning equipment
32; Button switch 34: Display unit
34a: Refrigerant leak indicator 34b: Refrigerant normal indicator
40: Control unit 42: Refrigerant leak confirmation mode
50: Refrigerant leak notification unit B: Battery

Claims (13)

In the vehicle air conditioning system including a refrigerant circulation line including a compressor, a high-pressure side heat exchanger, a high-pressure side expansion valve, an outdoor heat exchanger, a low-pressure side expansion valve, and a low-pressure side heat exchanger,
A refrigerant leak check key button unit that can set a mode for checking refrigerant leak of the air conditioning device;
When setting the refrigerant leak check using the refrigerant leak check key button, entering the refrigerant leak check mode and controlling the state of the air conditioning device to a preset specific condition, then refrigerant leakage in the air conditioning device under the air conditioner state of the specific condition. An air conditioning system for a vehicle, characterized in that it includes a control unit that determines whether there is a refrigerant leak from the air conditioning system by processing one or more refrigerant leak influencing factors affected by a pre-built refrigerant leak determination logic. According to clause 1,
The control unit,
When entering the refrigerant leak confirmation mode, completely close the high-pressure side expansion valve to block refrigerant between the upstream and downstream sides of the high-pressure side expansion valve;
After a preset time has elapsed, the change in refrigerant pressure in the refrigerant circulation line due to refrigerant blocking between the upstream and downstream sides of the high-pressure expansion valve is treated as a refrigerant leak influence factor and processed by the pre-built refrigerant leak detection logic to determine the condition of the air conditioning device. A vehicle air conditioning device characterized by determining whether there is a refrigerant leak. According to clause 2,
The control unit,
When entering the refrigerant leak confirmation mode, the refrigerant between the upstream and downstream sides of the high-pressure expansion valve is blocked to form a high pressure in the refrigerant in the refrigerant circulation line between the upstream side of the high-pressure expansion valve and the compressor, Negative pressure is formed in the refrigerant on the refrigerant circulation line side between the high-pressure expansion valve and the compressor;
After a preset time has elapsed, the size of the detected refrigerant pressure of the negative pressure detected between the downstream side of the high-pressure expansion valve and the compressor is compared with the size of the pre-built reference refrigerant pressure, and whether or not there is a refrigerant leak from the air conditioning device according to the results. A vehicle air conditioning device characterized in that it determines. According to clause 3,
The control unit,
The reference refrigerant pressure is built in as a negative value;
If the detected refrigerant pressure of the negative pressure is higher than the reference refrigerant pressure, it is determined that the refrigerant of the current air conditioning device is leaking;
If the detected refrigerant pressure of the negative pressure is less than the reference refrigerant pressure, it is determined that the refrigerant of the current air conditioning device is not leaking. According to clause 2,
The control unit,
When entering the refrigerant leak confirmation mode, the high-pressure side expansion valve is completely closed and the rotation speed of the compressor is controlled to a preset minimum rotation speed. According to clause 2,
The control unit,
When entering the refrigerant leak confirmation mode, the high-pressure side expansion valve is completely closed, and the blower, intake door, and each mode door are controlled in auto mode. Characterized by a vehicle air conditioning system. According to clause 2,
The control unit,
An air conditioning system for a vehicle, wherein when entering the refrigerant leak confirmation mode, the high pressure side expansion valve is completely closed and the air conditioning system is controlled in a heat pump mode. According to any one of claims 1 to 7,
An air conditioning system for a vehicle, characterized in that it further includes a refrigerant leak notification unit that notifies whether or not there is a refrigerant leak in the air conditioner according to the control of the control unit. According to clause 8,
The refrigerant amount notification unit is a display unit of a controller for controlling an air conditioning system;
The display unit,
a refrigerant leak display unit that lights up in response to a refrigerant leak signal from the control unit to inform the user of a refrigerant leak in the air conditioning system;
An air conditioning system for a vehicle, comprising a refrigerant normal display unit that lights up according to a refrigerant normal signal from the control unit and informs the user that there is no refrigerant leak from the air conditioner. According to clause 9,
The letters and symbols of the refrigerant leak display unit and the refrigerant normal display unit of the display unit are displayed on the display unit when the user presses the refrigerant leak confirmation key button to enter the refrigerant leak confirmation mode. . According to clause 10,
An air conditioning system for a vehicle, wherein when entering the refrigerant leak confirmation mode, all displays other than the refrigerant leak display unit and the refrigerant normal display unit are deleted from the display unit. According to clause 11,
The control unit,
In the state of entering the refrigerant leak confirmation mode, when the refrigerant leak confirmation key button unit is re-operated, the refrigerant leak confirmation mode is released and all states of the air conditioning device are restored to the state before entering the refrigerant leak confirmation mode, An air conditioning device for a vehicle, characterized in that it checks for refrigerant leaks in the air conditioning device. According to clause 12,
The refrigerant leak confirmation key button part,
It is a button-type switch installed on the controller for controlling the air conditioning system, and allows the user to enter or disable the refrigerant leak check mode to check the refrigerant leak within the air conditioner by pressing it to operate or re-operate it.

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