KR102656590B1 - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to an air conditioning system for vehicles. By improving the control structure of the compressor, it is possible to prevent “excessive increase in rotational speed” of the compressor within the limit that the cooling performance in the vehicle interior is not reduced, and through this, the “excessive increase in rotational speed” of the compressor can be prevented. The purpose is to prevent deterioration, damage, and destruction of the compressor and various refrigerant piping and sealing parts due to “excessive increase in rotation speed.”
In order to achieve this object, the present invention is an air conditioning device for a vehicle including a refrigerant circulation line including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, in which the compressor is operated according to the refrigerant discharge pressure and refrigerant discharge temperature at the outlet side of the compressor. It is further provided with a control unit that variably controls the rotation speed.

Description

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

The present invention relates to an air conditioning system for vehicles, and more specifically, by improving the control structure of the compressor, "excessive increase in rotational speed" of the compressor can be prevented within the limit that the cooling performance in the vehicle interior is not deteriorated. It is about an air conditioning system for vehicles that can prevent deterioration, damage, and destruction of the compressor and various refrigerant piping and sealing parts due to “excessive increase in rotational speed” of the compressor.

Hybrid vehicles are vehicles that use an electric motor and an internal combustion engine (engine) in parallel. When the vehicle's driving load is large, for example, when driving at high speeds or uphill, the engine switches to "engine drive mode" and the engine is switched on. Use .

Conversely, when the vehicle's driving load is small, for example, when driving at low speeds or stopping, it switches to the "motor drive mode" and uses the electric motor.

These hybrid vehicles (hereinafter collectively referred to as “vehicles”) are equipped with air conditioning devices that cool and heat the interior of the vehicle.

The air conditioning device is a heat pump type and is used for cooling or heating while being controlled in “air conditioner mode” or “heat pump mode” depending on the direction of refrigerant flow in the refrigerant circulation line.

In particular, in the “air conditioning mode”, the refrigerant is circulated while forming an “air conditioning cycle,” low-temperature “cold air” is generated through this refrigerant circulation, and the interior of the vehicle is cooled through the generated “cold air.”

And in the "heat pump mode", the refrigerant is circulated while forming a "heat pump cycle", high temperature "heat" is generated through this refrigerant circulation, and the interior of the vehicle is heated through the generated "heat".

However, this conventional air conditioning device has the disadvantage that the rotational speed of the compressor increases excessively when the cooling load rapidly increases. Because of this disadvantage, the refrigerant pressure and refrigerant temperature at the outlet side of the compressor increase, thereby increasing the compressor and various There is a problem of deterioration and damage to refrigerant piping and sealing parts.

In particular, when the water-cooled battery cooling device using the refrigerant of the air conditioner is operated during operation of the air conditioner, or the engine is operated and the heat of the engine acts on the outdoor heat exchanger for cooling the refrigerant of the air conditioner, the cooling of the air conditioner The load further increases, and the heat exchange efficiency of the outdoor heat exchanger further decreases. There is a disadvantage in that the rotational speed of the compressor increases excessively due to the increase in the cooling load and the decrease in the heat exchange efficiency of the outdoor heat exchanger.

Also, due to this disadvantage, there is a problem that the refrigerant pressure and refrigerant temperature at the outlet side of the compressor rise excessively. Because of this problem, the degree of deterioration and damage of the compressor and various refrigerant piping and sealing parts becomes more severe, and as a result, the durability of the air conditioning device is reduced. A drawback has been pointed out that this significantly decreases.

The present invention was created to solve the above-described conventional problems, and its purpose is to improve the control structure of the compressor, so that even if the cooling load increases due to various factors and the heat exchange efficiency of the outdoor heat exchanger decreases, the The goal is to provide an air conditioning system for vehicles that can prevent “excessive increase in rotational speed” of the compressor within the limit that indoor cooling performance is not deteriorated.

Another object of the present invention is to prevent “excessive increase in rotation speed” of the compressor within the limit of not deteriorating the cooling performance in the vehicle interior, so that the compressor and various refrigerant piping due to “excessive increase in rotation speed” of the compressor are prevented. The purpose is to provide an air conditioning system for vehicles that can prevent deterioration, damage, and destruction of sealing parts.

Another object of the present invention is to provide a vehicle air conditioning system whose durability can be significantly improved by preventing deterioration, damage, and breakage of the compressor and various refrigerant pipes and sealing parts due to “excessive increase in rotational speed” of the compressor. The purpose is to provide a device.

In order to achieve this purpose, an air conditioning system for a vehicle according to the present invention includes a refrigerant circulation line including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger, wherein the refrigerant discharge pressure on the outlet side of the compressor and It is characterized in that it further includes a control unit that variably controls the rotational speed of the compressor according to the refrigerant discharge temperature.

Preferably, the control unit adjusts the rotational speed of the compressor to a preset level before the refrigerant discharge pressure of the compressor increases and reaches the preset reference pressure, or before the refrigerant discharge temperature increases and reaches the preset reference temperature. It is characterized by gradually reducing the rotation speed value.

And the control unit is characterized in that it turns off the compressor when the refrigerant discharge pressure of the compressor reaches a preset reference pressure or when the refrigerant discharge temperature reaches a preset reference temperature.

And, when the refrigerant discharge pressure of the compressor is higher than the preset first reference pressure or the refrigerant discharge temperature is higher than the preset first reference temperature, the control unit increases the rotational speed of the compressor by 1 by the preset rotational speed value. reduce by car; When the refrigerant discharge pressure rises above the second reference pressure higher than the first reference pressure, or the refrigerant discharge temperature rises above the second reference temperature higher than the first reference temperature, the rotational speed of the compressor Secondarily reduces by a preset rotation speed value; When the refrigerant discharge pressure rises above the third reference pressure higher than the second reference pressure, or when the refrigerant discharge temperature rises above the third reference temperature higher than the second reference temperature, the compressor is turned off ( OFF).

And it further includes a water-cooled battery cooling device that cools the battery using the refrigerant in the refrigerant circulation line; When the water-cooled battery cooling device operates and the load on the compressor increases, the control unit variably controls the rotational speed of the compressor according to the refrigerant discharge pressure and refrigerant discharge temperature at the outlet side of the compressor, It is characterized by preventing an increase in rotation speed.

According to the vehicle air conditioning system according to the present invention, when the rotation speed of the compressor is excessive, the rotation speed of the compressor is controlled step by step until the “refrigerant discharge pressure” and “refrigerant discharge temperature” of the compressor reach a stable state. Because of its structure, it has the effect of preventing excessive increases in the “refrigerant discharge pressure” and “refrigerant discharge temperature” of the compressor due to excessive rotational speed of the compressor.

In addition, it can prevent excessive increases in the “refrigerant discharge pressure” and “refrigerant discharge temperature” of the compressor, preventing deterioration, damage, and destruction of the compressor and various refrigerant piping and sealing parts due to “excessive increase in rotation speed” of the compressor. There is an effect that can be done.

In addition, it can prevent deterioration, damage, and breakage of the compressor and various refrigerant pipes and sealing parts due to “excessive increase in rotational speed” of the compressor, thereby improving the durability of the air conditioning device.

In addition, when the rotational speed of the compressor decreases excessively, the structure increases the rotational speed of the compressor to the optimal state, preventing “excessive increase in rotational speed” of the compressor as long as the cooling performance in the cabin does not deteriorate. This has the effect of preventing deterioration, damage, and breakage of the compressor and various refrigerant piping and sealing parts within the limit that the cooling performance inside the vehicle does not deteriorate.

1 is a diagram showing a first embodiment of a vehicle air conditioning system according to the present invention;
Figure 2 is a graph showing an operation example of a vehicle air conditioner according to the present invention. When the air conditioner is operated, the change in compressor rotational speed (RPM) and the change in refrigerant temperature and pressure at the compressor outlet are compared to those of a conventional air conditioner. A graph showing comparison,
3 and 4 are flowcharts showing an example of operation of the vehicle air conditioning system according to the present invention;
Figure 5 is a diagram showing a second embodiment of a vehicle air conditioning system according to the present invention.

Hereinafter, preferred embodiments of a vehicle air conditioning system according to the present invention will be described in detail based on the attached drawings (components that are the same as those in the prior art will be described using the same symbols).

[First Example]

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 reviewed with reference to FIG. 1.

The vehicle air conditioning device 10 is a heat pump type and includes a refrigerant circulation line 12, which includes a compressor 14, a water-cooled heat exchanger 15, and an expansion valve for heat pump mode. (16), an outdoor heat exchanger (17), an expansion valve (18) for air conditioning mode, and an indoor heat exchanger (19).

This refrigerant circulation line 12 is controlled to the "air conditioner mode" when "cooling" the vehicle interior, and opens the expansion valve 16 for the heat pump mode.

Therefore, the internal refrigerant can be circulated without passing through the expansion valve 16 for heat pump mode, and through this refrigerant circulation, low-temperature “cold air” is generated in the indoor heat exchanger 19, and the generated “cold air” is “The interior of the car is cooled.

And when “heating” the interior of the vehicle, the “heat pump mode” is controlled and the expansion valve 16 for the heat pump mode is turned ON.

Therefore, the internal refrigerant is allowed to circulate while passing through the expansion valve 16 for heat pump mode, and through this refrigerant circulation, high-temperature “heat” is generated in the water-cooled heat exchanger 15, and the generated “heat” It is transmitted to the heater core side coolant circulation line (20). As a result, the high-temperature “heat” transferred to the heater core side coolant circulation line 20 is released into the vehicle interior through the heater core 22, thereby heating the vehicle interior.

Meanwhile, on the outdoor heat exchanger 17 side of the air conditioning device 10, the radiator 32 of the water-cooled electric component module cooling device 30 is arranged in parallel.

The radiator 32 of the water-cooled electrical component module cooling device 30 is arranged in parallel in front of the outdoor heat exchanger 17 based on the air flow direction, and connects the electrical component module side coolant circulation line 30a. The cooling water flowing along exchanges heat with the surrounding air. In particular, the coolant in the cooling water circulation line (30a) on the electrical component module side, which has absorbed the waste heat of the electrical module component (A), exchanges heat with the surrounding air. Therefore, the waste heat of the electrical module component (A) is released.

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 2.

First, referring to Figure 1, the air conditioning device of the present invention includes a compressor outlet side refrigerant pressure detection sensor 62 and a compressor outlet side refrigerant temperature detection sensor 64 installed on the outlet side of the compressor 14, and these sensors It includes a control unit 60 that variably controls the rotational speed of the compressor 14 according to the refrigerant pressure and refrigerant temperature at the outlet of the compressor 14 input from (62, 64).

The control unit 60 is equipped with a microprocessor and, while the air conditioning device 10 is operating, detects “refrigerant discharge” from the compressor outlet side refrigerant pressure detection sensor 62 and the compressor outlet side refrigerant temperature detection sensor 64. When “pressure” and “refrigerant discharge temperature” are input, the input “refrigerant discharge pressure” and “refrigerant discharge temperature” are compared with the pre-built “reference pressure” and “refrigerant temperature”.

In particular, the “refrigerant discharge pressure” input from the refrigerant pressure detection sensor 62 on the compressor outlet side is greater than or equal to the pre-built “first reference pressure (P1)” or the refrigerant temperature detection sensor 64 on the compressor outlet side. Compare and determine whether the “refrigerant discharge temperature” is higher than the pre-installed “first reference temperature (T1)”.

As a result of the determination, if the “refrigerant discharge pressure” is higher than the “first reference pressure (P1)” or the “refrigerant discharge temperature” is higher than the “first reference temperature (T1),” the control unit 60 determines the specific cause. It is recognized that the cooling load increases due to this, and as a result, the rotational speed of the compressor 14 increases excessively.

In particular, in the “battery charging mode”, the water-cooled battery cooling device 40 for cooling the battery B is operated, or the engine 50 is operated so that the heat of the engine 50 is transferred to the outdoor heat exchanger of the air conditioning device. When operating, the cooling load increases rapidly. In this case, the control unit 60 recognizes that the rotation speed of the compressor 14 increases excessively, and reduces the rotation speed of the compressor 14 according to this recognition. Decide that there is a need.

And when this determination is made, the control unit 60 enters the “primary compressor rotation speed reduction mode” and forcibly reduces the rotation speed of the compressor 14 by a preset “rotation speed value.”

Therefore, the rotational speed of the compressor 14 is prevented from excessively increasing. This prevents deterioration, damage, and breakage of the compressor 14 and various refrigerant piping and sealing parts caused by an “excessive increase in rotational speed” of the compressor 14.

Meanwhile, the control unit 60 controls the “refrigerant discharge pressure” input from the compressor outlet side refrigerant pressure detection sensor 62 and the compressor outlet side refrigerant temperature detection sensor 64 even in a state where the rotation speed of the compressor 14 is controlled to decrease. "and "refrigerant discharge temperature" are continuously monitored.

At this time, the “refrigerant discharge pressure” input from the refrigerant pressure detection sensor 62 on the compressor outlet side is higher than the “second reference pressure (P2)” which is higher than the “first reference pressure (P1)”, or the refrigerant on the compressor outlet side If the “refrigerant discharge temperature” input from the temperature detection sensor 64 is higher than the “second reference temperature (T2)” which is higher than the “first reference temperature (T1)”, the control unit 60 operates the compressor (14). ) is still recognized as excessive, and based on this recognition, it is determined that the rotation speed of the compressor 14 needs to be reduced again.

And when this determination is made, the control unit 60 enters the “secondary compressor rotation speed reduction mode” and reduces the rotation speed of the compressor 14 again by the preset “rotation speed value”.

Accordingly, “excessive increase” in the refrigerant discharge pressure and refrigerant discharge temperature due to excessive rotational speed of the compressor 14 is prevented. As a result, deterioration, damage, and breakage of the compressor 14 and various refrigerant piping and sealing parts due to an “excessive increase” in the refrigerant discharge pressure and refrigerant discharge temperature of the compressor 14 are once again prevented.

And the control unit 60 continues to monitor “refrigerant discharge pressure” and “refrigerant discharge temperature” even when the rotational speed of the compressor 14 is secondarily reduced.

As a result of monitoring, the "refrigerant discharge pressure" is higher than the "third reference pressure (P3)" which is higher than the "second reference pressure (P2)", or the "refrigerant discharge temperature" is higher than the "second reference temperature (T2)" If the condition is higher than the “third reference temperature (T3),” the control unit 60 determines that, despite reducing the rotation speed of the compressor 14, the rotation speed of the compressor 14 is still excessive, and the compressor 14 ) It is judged that the refrigerant discharge pressure and refrigerant discharge temperature are high.

And when this determination is made, the control unit 60 enters the “compressor off mode” and completely turns off the compressor 14.

Therefore, the compressor 14 is stopped. As a result, “excessive rise” in the refrigerant discharge pressure and refrigerant discharge temperature due to excessive rotational speed of the compressor 14 is fundamentally prevented. As a result, deterioration, damage, and destruction of the compressor 14 and various refrigerant piping and sealing parts due to “excessive rise” in refrigerant discharge pressure and refrigerant discharge temperature are fundamentally prevented.

As a result, the control unit 60 operates before the “refrigerant discharge pressure” reaches the “third reference pressure (P3)” or until the “refrigerant discharge temperature” reaches the “third reference temperature (T3).” , the rotational speed of the compressor 14 is gradually reduced.

Therefore, as shown in (a) of FIG. 2, an excessive increase in the refrigerant discharge pressure and refrigerant discharge temperature of the compressor 14 due to excessive rotational speed of the compressor 14 is gradually prevented. As a result, the compressor 14, refrigerant piping, and other components are primarily protected from excessive refrigerant discharge pressure and refrigerant discharge temperature.

Then, when the “refrigerant discharge pressure” reaches the “third reference pressure (P3)” or the “refrigerant discharge temperature” reaches the “third reference temperature (T3)”, the compressor 14 is completely turned off ( OFF).

Therefore, “excessive rise” in the refrigerant discharge pressure and refrigerant discharge temperature due to excessive rotational speed of the compressor 14 is fundamentally prevented.

In particular, as in the conventional air conditioning device shown in (b) of FIG. 2, there is an “excessive increase” in the refrigerant discharge pressure and refrigerant discharge temperature at the outlet side of the compressor 14 due to an excessive increase in the rotation speed of the compressor 14. fundamentally restricted.

As a result, the compressor 14, refrigerant piping, and other components are secondarily protected from excessive refrigerant discharge pressure and refrigerant discharge temperature.

Meanwhile, the control unit 60 enters the “primary compressor rotation speed reduction mode” or “secondary compressor rotation speed reduction mode” to reduce the rotation speed of the compressor 14, and “refrigerant discharge pressure” and “ Continuously monitor the “refrigerant discharge temperature.”

At this time, at least one of the conditions under which the “refrigerant discharge pressure” decreases below the “first reference pressure (P1)” and the condition under which the “refrigerant discharge temperature” decreases below the “first reference temperature (T1)” is met. is satisfied, and at the same time, the “refrigerant discharge pressure” is lower than the “fourth reference pressure (P4)” lower than the “first reference pressure (P1)” and the “refrigerant discharge temperature” is lower than the “first reference temperature (T1)” If all conditions above the “fourth reference temperature (T4)” are satisfied, the control unit 60 determines that the rotational speed of the compressor 14 is stable and thus the refrigerant discharge pressure and refrigerant discharge temperature are also stable.

When this determination is made, the control unit 60 enters the “compressor rotation speed maintenance mode” and maintains the rotation speed of the compressor 14 in the current state.

And the control unit 60, while entering the “primary compressor rotation speed reduction mode”, “secondary compressor rotation speed reduction mode”, or “compressor rotation speed maintenance mode”, changes the “refrigerant discharge pressure” to the “fourth reference pressure (P4). )", or if the "refrigerant discharge temperature" falls below the "fifth reference temperature (T5)", which is lower than the "fourth reference temperature (T4)", It is determined that the rotational speed of the compressor 14 is too low and the cooling performance in the vehicle interior is deteriorated.

When this determination is made, the control unit 60 enters the “compressor rotation speed increase mode” and increases the rotation speed of the compressor 14 by a preset “rotation speed value.” Therefore, by increasing the refrigerant discharge pressure within the device, the cooling performance in the vehicle interior is improved.

Next, an operation example of the present invention having this configuration will be described with reference to FIGS. 1, 3, and 4.

First, referring to FIG. 3, when the air conditioning device 10 is turned on (S101), the “refrigerant discharge pressure” of the compressor 14 is higher than the “first reference pressure (P1)” or “ Compare and determine whether the “refrigerant discharge temperature” is higher than the “first reference temperature (T1)” (S103).

As a result of the determination, if the “refrigerant discharge pressure” is higher than the “first reference pressure (P1)” or the “refrigerant discharge temperature” is higher than the “first reference temperature (T1)”, the control unit 60 operates the compressor 14. ) is recognized as excessively increasing, and according to this recognition, it enters the “primary compressor rotation speed reduction mode” (S105).

Then, the control unit 60, which has entered the “primary compressor rotation speed reduction mode,” forcibly reduces the rotation speed of the compressor 14 by a preset “rotation speed value” (S107).

Then, the “excessive increase in rotation speed” of the compressor 14 is prevented, thereby preventing deterioration, damage, or breakage of the compressor 14 and various refrigerant pipes and sealing parts due to the “excessive increase in rotation speed” of the compressor 14. This is prevented.

Meanwhile, as a result of the judgment in step (S103), if the “refrigerant discharge pressure” is not higher than the “first reference pressure (P1)” or the “refrigerant discharge temperature” is not higher than the “first reference temperature (T1)” (S103-1), that is, if the “refrigerant discharge pressure” is less than the “first reference pressure (P1)” or the “refrigerant discharge temperature” is less than the “first reference temperature (T1)”, the control unit 60 , the “refrigerant discharge pressure” is higher than the “fourth reference pressure (P4)” which is lower than the “first reference pressure (P1)”, and the “refrigerant discharge temperature” is lower than the “first reference temperature (T1)”. Determine whether it is above the “standard temperature (T4)” (S109).

That is, under the condition that “refrigerant discharge pressure” is a value between “first reference pressure (P1)” and “fourth reference pressure (P4)”, and “refrigerant discharge temperature” is between “first reference temperature (T1)” and “refrigerant discharge temperature”. Determine whether all conditions between the “fourth reference temperature (T4)” are satisfied.

As a result of the determination, if the “refrigerant discharge pressure” is higher than the “fourth reference pressure (P4)” and the “refrigerant discharge temperature” is higher than the “fourth reference temperature (T4),” the control unit 60 operates the compressor 14. Since the rotation speed is stable, the refrigerant discharge pressure and refrigerant discharge temperature are also recognized as stable.

And according to this recognition, the control unit 60 enters the “compressor rotation speed maintenance mode” (S111) and maintains the rotation speed of the compressor 14 in the current state (S113).

Meanwhile, as a result of the judgment, if the “refrigerant discharge pressure” is not more than the “fourth reference pressure (P4)” and the “refrigerant discharge temperature” is not more than the “fourth reference temperature (T4)” (S109-1), that is, If the “refrigerant discharge pressure” is less than the “fourth reference pressure (P4)” and the “refrigerant discharge temperature” is less than the “fourth reference temperature (T4),” the control unit 60 sets the “refrigerant discharge pressure” to “ The “fifth standard pressure (P5)” is lower than the “fourth standard pressure (P4),” or the “refrigerant discharge temperature” is lower than the “fourth standard temperature (T4).” " Re-determine whether it deteriorates to below (S115).

As a result of the determination, if the “refrigerant discharge pressure” decreases below the “fifth reference pressure (P5)” or the “refrigerant discharge temperature” decreases below the “fifth reference temperature (T5)”, the control unit 60 , it is recognized that the rotational speed of the compressor 14 is too low and the cooling performance in the vehicle interior is deteriorated.

And according to this recognition, the control unit 60 enters the “compressor rotation speed increase mode” (S115) and increases the rotation speed of the compressor 14 by a preset “rotation speed value” (S117). Then, the refrigerant discharge pressure within the device increases and the cooling performance inside the vehicle improves.

Referring again to FIG. 3, the control unit 60 adjusts the “refrigerant discharge pressure” to the “first reference pressure (P1)” in a state in which the rotational speed of the compressor 14 is primarily reduced (S107). It is determined again whether it is higher than the “second reference pressure (P2)” or whether the “refrigerant discharge temperature” is higher than the “second reference temperature (T2)” higher than the “first reference temperature (T1)” (S121 ).

As a result of the determination, if the “refrigerant discharge pressure” is higher than the “second reference pressure (P2)” or the “refrigerant discharge temperature” is higher than the “second reference temperature (T2),” the control unit 60 operates the compressor 14. ) is still recognized as excessive, and according to this recognition, it enters the “secondary compressor rotation speed reduction mode” (S123).

Then, the control unit 60, which has entered the “secondary compressor rotation speed reduction mode,” reduces the rotation speed of the compressor 14 again by the preset “rotation speed value” (S125).

Then, “excessive rise” in the refrigerant discharge pressure and refrigerant discharge temperature due to excessive rotational speed of the compressor 14 is prevented. As a result, deterioration, damage, and breakage of the compressor 14 and various refrigerant piping and sealing parts due to an “excessive increase” in refrigerant discharge pressure and refrigerant discharge temperature are prevented.

Meanwhile, as a result of the judgment in step (S121), if the “refrigerant discharge pressure” is not higher than the “second reference pressure (P2)” or the “refrigerant discharge temperature” is not higher than the “second reference temperature (T2)” (S121-1), that is, if the “refrigerant discharge pressure” is less than the “second reference pressure (P2)” or the “refrigerant discharge temperature” is less than the “second reference temperature (T2)”, the control unit 60 , perform the steps (S109), (S111), (S113), (S115), (S117), and (S119) described above.

Therefore, depending on the “refrigerant discharge pressure” and “refrigerant discharge temperature”, the rotation speed of the compressor 14 is maintained at the current state or increased by a preset “rotation speed value”.

And, referring to Figures 3 and 4, the control unit 60, in a state in which the rotational speed of the compressor 14 is secondarily reduced (S125), the "refrigerant discharge pressure" is set to the "second reference pressure ( Re-determine whether the “3rd reference pressure (P3)” is higher than the “P2)” or the “refrigerant discharge temperature” is higher than the “3rd reference temperature (T3)” that is higher than the “2nd reference temperature (T2)” Do it (S127).

As a result of the determination, if the “refrigerant discharge pressure” is higher than the “third reference pressure (P3)” or the “refrigerant discharge temperature” is higher than the “third reference temperature (T3),” the control unit 60 operates the compressor 14. ), the rotation speed of the compressor 14 is still recognized as excessive, and according to this recognition, the “compressor off mode” is entered (S129).

Then, the control unit 60, which has entered the “compressor off mode”, turns off the compressor 14 (S131).

Then, the compressor 14 is stopped, and the excessive rotational speed of the compressor 14 and the resulting “excessive rise” in the refrigerant discharge pressure and refrigerant discharge temperature are fundamentally blocked. As a result, deterioration, damage, and breakage of the compressor 14 and various refrigerant piping and sealing parts due to “excessive increases” in refrigerant discharge pressure and refrigerant discharge temperature are fundamentally prevented.

Meanwhile, as a result of the judgment in step (S127), if the “refrigerant discharge pressure” is not higher than the “third reference pressure (P3)” or the “refrigerant discharge temperature” is not higher than the “third reference temperature (T3)” (S127-1), that is, if the “refrigerant discharge pressure” is less than the “third reference pressure (P3)” or the “refrigerant discharge temperature” is less than the “third reference temperature (T3)”, the control unit 60 , perform the steps (S109), (S111), (S113), (S115), (S117), and (S119) described above.

Therefore, depending on the “refrigerant discharge pressure” and “refrigerant discharge temperature”, the rotation speed of the compressor 14 is maintained at the current state or increased by a preset “rotation speed value”.

[Second Embodiment]

Next, Figure 5 shows a diagram showing a second embodiment of a vehicle air conditioning system according to the present invention.

The air conditioning device of the second embodiment has the same main structure as the first embodiment described above. In particular, the refrigerant pressure and refrigerant temperature at the outlet side of the compressor 14 are detected through the compressor outlet side refrigerant pressure detection sensor 62 and the compressor outlet side refrigerant temperature detection sensor 64, and the control unit based on the sensed data The structure and control logic by which (60) variably controls the rotational speed of the compressor (14) are the same.

However, the air conditioning device of the second embodiment, unlike the vehicle of the first embodiment that uses the engine 50 as a power source, can be applied to vehicles without the engine 50, for example, electric vehicles or fuel cell vehicles. You can.

In the air conditioning device of this second embodiment, an electric heater 22a is installed in place of the heater core 22 (see FIG. 1) of the first embodiment that uses engine coolant waste heat as the main heating source in the vehicle interior.

The electric heater 22a heats the vehicle interior while operating using electricity provided from the battery B as an energy source.

According to the air conditioning device of the present invention having such a configuration, when the rotational speed of the compressor 14 is excessive, the “refrigerant discharge pressure” and “refrigerant discharge temperature” of the compressor 14 are maintained until they reach a stable state. Since it is a structure that controls the rotational speed of the compressor 14 in stages, it is possible to prevent excessive increases in the “refrigerant discharge pressure” and “refrigerant discharge temperature” of the compressor 14 due to excessive rotational speed of the compressor 14. .

In addition, it is possible to prevent excessive increases in the “refrigerant discharge pressure” and “refrigerant discharge temperature” of the compressor (14), thereby preventing the compressor (14) and various refrigerant pipes from sealing due to “excessive increase in rotational speed” of the compressor (14). It can prevent deterioration, damage, and destruction of parts.

In addition, it is possible to prevent deterioration, damage, and breakage of the compressor 14 and various refrigerant pipes and sealing parts due to “excessive increase in rotational speed” of the compressor 14, thereby improving the durability of the air conditioning device.

In addition, when the rotational speed of the compressor 14 decreases excessively, the rotational speed of the compressor 14 is increased to an optimal state, so the compressor 14 is maintained within the limit that the cooling performance in the vehicle cabin is not deteriorated. It is possible to prevent "excessive increase in rotation speed", and through this, deterioration, damage, and destruction of the compressor (14) and various refrigerant piping and sealing parts can be prevented as long as the cooling performance inside the vehicle does not deteriorate. .

In addition, when the water-cooled battery cooling device 40 using the refrigerant of the air conditioning device 10 operates and the rotation speed of the compressor 14 increases, the “refrigerant discharge pressure” and “refrigerant discharge temperature” of the compressor 14 Since the structure gradually controls the rotational speed of the compressor 14 until it reaches a stable state, it is possible to prevent excessive increase in the rotational speed of the compressor 14 even though the water-cooled battery cooling device 40 is operating. Through this, the durability of the compressor 14 can be improved regardless of the operation of the water-cooled battery cooling device 40.

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)
14: Compressor 15: Water-cooled heat exchanger
16: Expansion valve for heat pump mode (Valve)
17: Outdoor heat exchanger 18: Expansion valve for air conditioning mode
19: Indoor heat exchanger 20: Heater core side coolant circulation line
22: Heater Core 30: Water-cooled electronic component module cooling device
30a: Coolant circulation line on the electrical component module side
32: Radiator 40: Water-cooled battery cooling device
50: Engine 60: Control unit
62: Refrigerant pressure sensor at the compressor outlet
64: Refrigerant temperature detection sensor at compressor outlet side

Claims (10)

delete delete delete In the vehicle air conditioning system including a refrigerant circulation line including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger,
It further includes a control unit that variably controls the rotational speed of the compressor according to the refrigerant discharge pressure and refrigerant discharge temperature at the outlet side of the compressor;
The control unit,
Before the refrigerant discharge pressure of the compressor rises and reaches the preset reference pressure, or before the refrigerant discharge temperature rises and reaches the preset reference temperature, the rotational speed of the compressor is gradually increased by the preset rotational speed value. reducing;
The control unit,
When the refrigerant discharge pressure of the compressor reaches a preset reference pressure, or when the refrigerant discharge temperature reaches a preset reference temperature, turning off the compressor;
The control unit,
When the refrigerant discharge pressure of the compressor is higher than a preset first reference pressure or the refrigerant discharge temperature is higher than the preset first reference temperature, firstly reducing the rotational speed of the compressor by a preset rotational speed value;
When the refrigerant discharge pressure rises above the second reference pressure higher than the first reference pressure, or when the refrigerant discharge temperature rises above the second reference temperature higher than the first reference temperature, the rotational speed of the compressor Secondarily reduces by a preset rotation speed value;
When the refrigerant discharge pressure rises above the third reference pressure higher than the second reference pressure, or when the refrigerant discharge temperature rises above the third reference temperature higher than the second reference temperature, the compressor is turned off ( A vehicle air conditioning device characterized by turning it OFF). According to clause 4,
The control unit,
At least one of the conditions that the refrigerant discharge pressure of the compressor is less than the first reference pressure and the condition that the refrigerant discharge temperature is less than the first reference temperature is satisfied, and the refrigerant discharge pressure is lower than the first reference pressure. An air conditioning system for a vehicle, characterized in that maintaining the rotational speed of the compressor at the current state when all conditions are satisfied such that the fourth reference pressure is higher than the fourth reference temperature and the refrigerant discharge temperature is lower than the first reference temperature. According to clause 5,
The control unit,
When the refrigerant discharge pressure of the compressor is lower than the fifth standard pressure lower than the fourth standard pressure, or when the refrigerant discharge temperature is lower than the fifth reference temperature lower than the fourth standard temperature, the rotation speed of the compressor is set to a preset level. An air conditioning device for a vehicle, characterized in that it increases the rotation speed value. According to any one of claims 4 to 6,
It includes a compressor outlet-side refrigerant pressure detection sensor and a compressor outlet-side refrigerant temperature detection sensor that detect the refrigerant discharge pressure and refrigerant discharge temperature at the outlet of the compressor;
An air conditioning device for a vehicle, wherein the compressor outlet side refrigerant pressure detection sensor and the compressor outlet side refrigerant temperature detection sensor are installed on the outlet side of the compressor. According to clause 7,
a water-cooled heat exchanger that dissipates heat from the refrigerant discharged from the compressor;
It includes a heater core side coolant circulation line that circulates coolant between the water-cooled heat exchanger and the heater core to heat the vehicle interior with heat from the compressor side refrigerant;
An air conditioning device for a vehicle, wherein the compressor outlet side refrigerant pressure detection sensor and the compressor outlet side refrigerant temperature detection sensor are installed between the compressor outlet and the water-cooled heat exchanger. In the vehicle air conditioning system including a refrigerant circulation line including a compressor, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger,
It further includes a control unit that variably controls the rotational speed of the compressor according to the refrigerant discharge pressure and refrigerant discharge temperature at the outlet side of the compressor;
It further includes a water-cooled battery cooling device that cools the battery using the refrigerant in the refrigerant circulation line;
The control unit,
When the water-cooled battery cooling device is operated to cool the battery and the load on the compressor increases, the rotational speed of the compressor is variably controlled according to the refrigerant discharge pressure and refrigerant discharge temperature at the outlet side of the compressor, An air conditioning system for vehicles, characterized in that it prevents excessive increases in rotational speed. According to any one of claims 4 to 6,
It further includes a water-cooled electrical components module cooling device that circulates coolant between the electrical module components and a radiator to cool the electrical module components;
An air conditioning device for a vehicle, characterized in that the radiator of the water-cooled electrical component module cooling device is installed in parallel on the upstream side of the outdoor heat exchanger based on the air flow direction.

Images