KR20230109013A - Electric vehicle air conditioning system and its control method - Google Patents

Abstract

The present invention relates to an air conditioning system for an electric vehicle and a method for controlling the same, and more particularly, in an air conditioning system to which a four-way valve is applied, when operating in an indoor heating mode, the initial warm-up is quickly performed while reducing power consumption of a battery. Provided is an air conditioning system of an electric vehicle that can reduce energy consumption and a control method thereof. A control method of an air conditioning system for an electric vehicle according to the present invention includes determining whether a current air conditioning mode is set to a cooling mode or a heating mode; determining whether the current outdoor temperature is within a set range when the current air conditioning mode is set to the heating mode; When the current outside air temperature is within the set range, the temperature obtained by adding the first compensation temperature to the set temperature set by the user is set as the target temperature of the internal heat exchanger, and PID control of the compressor is performed for a certain period of time. , setting the temperature obtained by adding the second compensation temperature value to the set temperature value as the target temperature value of the heater core, and performing PID control of the cooling water electric heater for a predetermined period of time.

Description

Electric vehicle air conditioning system and its control method

The present invention relates to an air conditioning system for an electric vehicle and a method for controlling the same, and more particularly, in an air conditioning system to which a four-way valve is applied, when operating in an indoor heating mode, the initial warm-up is quickly performed while reducing power consumption of a battery. It relates to an air conditioning system of an electric vehicle that can reduce energy consumption and a control method thereof.

As is well known, an air conditioning system for regulating indoor air temperature is provided in automobiles. Such an air conditioning system for automobiles keeps the interior warm by generating warmth in winter and cools the interior by generating cool air in summer.

In a typical automotive air conditioning system, a compressor, a condenser, an expansion valve, and an evaporator are sequentially connected by refrigerant pipes, and the refrigerant circulates while the compressor is driven by engine power. In this automotive air conditioning system, refrigerant gas compressed at high temperature and high pressure in a compressor passes through a condenser, exchanges heat with the surrounding air, and is converted into a liquid refrigerant. The liquefied refrigerant passes through a receiver dryer connected to the condenser to remove impurities. After passing through the expansion valve, it is changed to a low-temperature gas. Then, the vaporized low-temperature refrigerant passes through the evaporator and is cooled while exchanging heat with the surrounding air. , the process of being compressed at high pressure is repeatedly cycled.

Meanwhile, recently, electric vehicles using electric energy as a power source have been released. An air conditioning system installed in such electric vehicles is configured to heat water or air through power supplied from a battery to heat the interior of the vehicle. There is a disadvantage of significantly degrading the power performance of the vehicle.

Accordingly, a heat pump system is applied to the air conditioning system of an electric vehicle, similar to a conventional internal combustion engine vehicle. This heat pump system reversibly applies a cycle consisting of compression-condensation-decompression-evaporation of refrigerant to provide cooling and heating It is a combined heating and cooling system.

That is, the heat pump system has a circulation cycle in which the liquid refrigerant evaporates in the evaporator, takes heat from the surroundings, becomes a gas, and then liquefies while releasing heat to the surroundings in the condenser. It has the advantage of being able to secure a heat source that is lacking in the air conditioning system.

A conventional air conditioning system for an electric vehicle to which such a heat pump system is applied performs indoor heating using two heat sources of a heat pump and a coolant heater when operating in an indoor heating mode. Here, the heat pump has the advantage of being far superior in efficiency, but has the disadvantage that the usable external environment is limited and the maximum performance varies greatly depending on the external environment. On the other hand, the cooling water heater has the advantage of being able to apply as much heat as desired in any case, but has the disadvantage of high power consumption.

Therefore, when the two heat sources, the heat pump and the coolant heater, are simultaneously operated to quickly increase heating performance when heating the interior of a vehicle using an air conditioning system, power consumption of the battery increases accordingly, and thus the driving distance of the vehicle is inevitably shortened. In the case of an electric vehicle, the best goal is to increase the mileage while minimizing power consumption of the battery. The goal of improving user convenience and the goal of improving the mileage are goals that inevitably conflict with each other.

Meanwhile, in a heat pump system of an electric vehicle, a refrigerant is compressed through a compressor and the compressed refrigerant is transferred to an external heat exchanger or an internal heat exchanger according to an air conditioning mode to perform indoor heating. At this time, when the user sets the indoor cooling/heating temperature, the controller sets the ambient temperature of the internal heat exchanger provided inside the HVAC (Heating Ventilation Air Conditioning System) module as the target temperature, Indoor cooling and heating is performed by PID control until the temperature difference between the set target temperature converges within the set error range.

However, due to the characteristics of the refrigerant that is affected by the temperature and pressure, such a heat pump system, in a low-temperature environment of -20 degrees or less outside the vehicle, the temperature and pressure of the refrigerant change according to the outside temperature. This change, or the temperature deviation (temperature drop) according to the position of the internal heat exchanger and the heater core in the HVAC module, and the temperature deviation due to the difference in the flow path shape and discharge air volume inside the HVAC module are generated, resulting in actual heat pump operation Even if the system is driven under the set control conditions, a certain degree of deviation occurs in the indoor temperature felt by the user. In spite of this situation, general users are demanding rapid warm-up in order to increase the indoor heating temperature of the vehicle in a low-temperature environment with low outside air temperature, so countermeasures against this situation are urgently needed.

Republic of Korea Patent Registration No. 10-1815863 (2018.01.02)

The present invention has been made to solve the above conventional problems, and the technical problem to be solved in the present invention is to warm up the initial warm-up when operating in the indoor heating mode in a specific outdoor temperature environment in an air conditioning system to which a four-way valve is applied. ) and to provide an air conditioning system and a control method for an electric vehicle capable of minimizing a reduction in the mileage of a vehicle by reducing power consumption of a battery while quickly performing the same.

To solve the above technical problem, a control method of an air conditioning system for an electric vehicle according to the present invention includes the steps of (a) determining whether a current air conditioning mode is set to a cooling mode or a heating mode; (b) determining whether the current outdoor temperature is within a set range when the current air conditioning mode is set to the heating mode; (c) When the current outdoor temperature is within the set range, the temperature obtained by adding the first compensation temperature to the set temperature value set by the user is set as the target temperature value of the internal heat exchanger to perform PID control of the compressor for a certain period of time. and, at the same time, setting the temperature obtained by adding the second compensation temperature value to the set temperature value as the target temperature value of the heater core, and performing PID control of the cooling water electric heater for a predetermined period of time.

Here, the control method of the air conditioning system for an electric vehicle according to the present invention determines whether a request to enter the internal heat exchanger drying mode is received when the current outside air temperature is within the set range in step (b) , If it is confirmed that the request to enter the internal heat exchanger drying mode is received, entering the internal heat exchanger drying mode and performing a drying operation of the internal heat exchanger for a set time (b-1); may further include.

In this case, after entering the internal heat exchanger drying mode in step (b-1), in the first step, the heater core and the blower fan inside the HVAC module are operated for a certain period of time to dehumidify the internal heat exchanger and heat the room. In step 2, the remaining moisture in the internal heat exchanger can be removed by operating the compressor at the set minimum RPM for a certain period of time.

In addition, during the drying operation of the internal heat exchanger in step (b-1), when the defrost mode or the cooling mode is changed by a user's operation or set conditions, or when the air conditioning system is turned off, the internal heat exchanger Drying operation can be stopped.

In addition, when the battery is reset, the drying operation of the internal heat exchanger may be performed by entering the internal heat exchanger drying mode of step (b-1).

On the other hand, in the control method of the air conditioning system for an electric vehicle according to the present invention, when it is confirmed that the current air conditioning mode is set to the cooling mode in step (a), the position is switched to the heating mode while operating in the set normal cooling mode. A step (a-1) of determining whether or not has occurred may be further included.

At this time, whether or not the position conversion to the heating mode has occurred in step (a-1) can be determined by whether or not the position of the 4-way valve is switched.

And, if it is determined that the position conversion to the heating mode has occurred in the step (a-1), the internal heat exchanger drying mode of the step (b-1) is entered, the drying operation of the internal heat exchanger is performed, and the heating mode is performed. If it is determined that the position change of has not occurred, it may operate in the set normal cooling mode.

Meanwhile, an air conditioning system for an electric vehicle according to the present invention includes a compressor for compressing and discharging a refrigerant; A four-way valve for transferring the refrigerant discharged from the compressor to an external heat exchanger or an internal heat exchanger according to an air conditioning mode; an external heat exchanger for exchanging heat with air outside the vehicle and the refrigerant transferred from the compressor or the internal heat exchanger; an internal heat exchanger for exchanging heat between the refrigerant transferred from the external heat exchanger and air supplied to the HVAC module, or exchanging heat with the air supplied to the HVAC module and the refrigerant discharged from the compressor; a first temperature sensor installed on the side of the internal heat exchanger to detect a temperature around the internal heat exchanger; a heater core installed at a position spaced apart from the internal heat exchanger, supplied with cooling water heated by the cooling water electric heater, and heating air discharged through the internal heat exchanger; a second temperature sensor installed on the side of the heater core to detect a temperature around the heater core; a blower fan installed inside the HVAC module and blowing air to the internal heat exchanger; A controller for controlling the compressor, the cooling water electric heater, and the blower fan based on the temperature values detected from the first temperature sensor and the second temperature sensor; including,

When the current outside air temperature is within a set range, the control unit sets the temperature obtained by adding the first compensation temperature value to the set temperature value set by the user as the target temperature value of the internal heat exchanger to operate the compressor for a certain period of time. At the same time as the PID control, the temperature obtained by adding the second compensation temperature value to the set temperature value is set as the target temperature value of the heater core, and PID control of the cooling water electric heater is performed for a predetermined time.

Here, the control unit determines whether a request to enter the internal heat exchanger drying mode is received when the current outdoor temperature is within a set range, and if it is confirmed that the request to enter the internal heat exchanger drying mode is received, the internal heat exchanger is dried. It can be controlled to enter the mode and perform the drying operation of the internal heat exchanger for a set time.

In this case, after the controller enters the internal heat exchanger drying mode, in the first step, the heater core and the blower fan inside the HVAC module are operated for a predetermined period of time to control the internal heat exchanger to dehumidify and heat the room, and in the second step The compressor can be operated for a certain period of time at the set minimum RPM to remove residual moisture in the internal heat exchanger.

The control unit stops the drying operation of the internal heat exchanger when the defrost mode or the cooling mode is changed by a user's manipulation or a set condition while the internal heat exchanger is being dried, or when the air conditioning system is turned off. You can control it.

In addition, the controller may control the internal heat exchanger to enter an internal heat exchanger drying mode and perform a drying operation of the internal heat exchanger when the battery is reset.

In addition, when it is determined that the position change from the cooling mode to the heating mode has occurred, the control unit enters the internal heat exchanger drying mode and controls the internal heat exchanger to perform a drying operation. If it is determined, it can be controlled to operate in the set normal cooling mode.

According to the air conditioning system for an electric vehicle and its control method of the present invention, in the past, a change in the characteristics of a refrigerant according to a low-temperature outdoor temperature environment, a temperature deviation (amount of temperature decrease) according to the installation position of an internal heat exchanger and a heater core, and an HVAC module Depending on the temperature deviation due to the difference in the shape of the internal flow path and the discharge air volume, a certain level of deviation occurred in the room temperature felt by the user even when the heat pump was driven according to the control conditions set during the actual operation of the heat pump, but the air conditioning system and control thereof of the present invention According to the method, when the current outside air temperature of the vehicle is within the set temperature range, the temperature obtained by adding the first compensation temperature value to the set temperature value set by the user is set as the target temperature value of the internal heat exchanger, and the PID compressor is operated for a certain period of time. At the same time, by setting the temperature obtained by adding the second compensation temperature value different from the first compensation temperature value to the set temperature value as the target temperature value of the heater core, PID controls the coolant electric heater for a certain period of time, thereby controlling the outside air temperature of the vehicle. Even in a low-temperature environment with low temperature, it is possible to quickly warm up the room through a simple control logic, and after warm-up, in a state stabilized by PID control, the ambient temperature of the internal heat exchanger is higher than the ambient temperature of the heater core Since it is possible to implement a logic in which the cooling water electric heater hardly operates by being maintained at , there is an advantage in that power consumption can be minimized.

In addition, the target temperature can be controlled through a simple control logic regardless of various constraints or driving environments according to the operation of the heat pump system, and a high level of low-temperature fuel efficiency can be achieved even in a low-temperature environment with a low total mileage. Since this becomes possible, it has the effect of increasing the low-temperature mileage by more than 80% compared to room temperature.

1 is a configuration diagram showing the configuration of an air conditioning system for an electric vehicle according to the present invention.
Figure 2 is a schematic diagram showing the flow of refrigerant when the air conditioning system is operated in a cooling mode.
Figure 3 is a schematic diagram showing the flow of refrigerant when the air conditioning system is operated in a heating mode.
Figure 4 is a schematic diagram showing the flow of refrigerant when the air conditioning system is simultaneously operated in a cooling mode and a battery cooling mode.
5 is a conceptual diagram showing that an internal heat exchanger and a heater core are simultaneously operated to perform indoor warm-up when an air conditioning system is operated in a heating mode in a low-temperature environment with a low outdoor temperature.
6 is a flow chart showing a control method of an air conditioning system according to the present invention.
7 is a PID control of the compressor and the cooling water electric heater by setting the temperature obtained by adding a different specific compensation temperature value to the set temperature value set by the user as the target temperature value of the internal heat exchanger and heater core when the air conditioning system operates in a heating mode. Diagram that shows that is made up of equations.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention.

However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In addition, parts marked with the same reference numerals throughout the detailed description indicate the same components.

Hereinafter, an air conditioning system for an electric vehicle and a control method thereof according to an embodiment of the present invention will be described in detail.

1 is a configuration diagram showing the overall configuration of an air conditioning system for an electric vehicle according to an embodiment of the present invention.

Referring to FIG. 1 , an air conditioning system 100 for an electric vehicle according to an embodiment of the present invention includes a compressor 110 disposed at a specific location and performing a specific role, a 4-way valve 120, and an external heat exchanger 130 ), the internal heat exchanger 140, the electric appliance cooling circuit part 160, the first expansion valve 170, the battery chiller 190, the second expansion valve 191, and the compressor 110 according to the air conditioning mode, It is configured to include a control unit (Electric HVAC vehicle control unit, EHVCU) that controls the valve 120, the cooling water electric heater 104, and the first and second expansion valves 170 and 191, respectively.

The compressor 110 compresses and discharges the refrigerant, and includes an electric compressor capable of controlling the RPM of the compressor 110 via PID (Proportional Integral Differential Control) through a controller.

When the indoor temperature of the compressor 110 is controlled by the user, the control unit sets the temperature around the internal heat exchanger 140 as a target temperature, and the set target temperature and the current internal heat exchanger measured from the temperature sensor (140) Indoor cooling or heating may be performed by PID controlling the compressor 110 through feedback control until the ambient temperature difference converges within a preset error range.

The four-way valve 120 transfers the refrigerant discharged from the compressor 110 to the external heat exchanger 130 or to the internal heat exchanger 140 according to the air conditioning mode, and specifies the flow of the refrigerant through the control of the controller. direction can be induced.

The external heat exchanger 130 functions to heat exchange the refrigerant transferred from the compressor 110 or the internal heat exchanger 140 with air outside the vehicle, and the internal heat exchanger 140 transfers the refrigerant transferred from the external heat exchanger 130 It serves to exchange heat with air supplied to the room where the occupant is located, or to exchange heat with the air supplied to the room with the refrigerant discharged from the compressor 110.

The first expansion valve 170 may be disposed on a refrigerant line drawn into or discharged from the internal heat exchanger 140 and operated according to a control signal transmitted from the controller to expand the refrigerant. At this time, as the first expansion valve 170, an electronic expansion valve (EEV) capable of adjusting the amount of opening by PID control may be used.

The electrical component cooling circuit unit 160 is mounted adjacent to the external heat exchanger 130 and functions to absorb heat generated from electrical components installed in the vehicle and discharge it to the outside according to the air conditioning mode.

The electrical component cooling circuit part 160 is installed between the external heat exchanger 130 and the 4-way valve 120 to transfer the refrigerant discharged from the external heat exchanger 130 and the cooling water flowing along the electrical component cooling water passage 162 to each other. A refrigerant/electrical cooling water heat exchanger 161 for exchanging heat is provided.

The electrical component cooling water passage 162 forms one coolant flow passage connecting the refrigerant/electric component cooling water heat exchanger 161 and the electrical component radiator 163, and the electrical component installed in the vehicle is on the electrical component cooling water bypass passage 167. An electrical component cooling means 164 for absorbing heat generated from the electrical component and an electrical component cooling water circulation pump 165 generating a one-way flow of the cooling water are mounted, and the intersection point of the electrical component cooling water passage 162 and the electrical component cooling water bypass passage 167 A three-way valve 166 for cooling electrical components is installed.

In addition, the electrical component radiator 163 is mounted adjacent to the external heat exchanger 130 and discharges heat of the cooling water flowing through the electrical component cooling water passage 162 . At this time, in some cases, heat generated from electric components mounted in the vehicle can be absorbed by using the electric component cooling circuit unit 160 and released only through the electric component radiator 163, and a separate cooling fan 168 is installed to dissipate heat. can promote

On the other hand, the four-way valve 120 for inducing the flow of refrigerant in a specific direction is configured to include a first port 121, a second port 122, a third port 123, and a fourth port 124. .

Specifically, the first port 121 of the four-way valve is a refrigerant inlet through which the refrigerant discharged from the compressor 120 is always introduced regardless of the air conditioning mode, and the second port 122 is the first port ( 121) or a refrigerant inlet and outlet selectively communicated with the third port 123, and is connected to the internal heat exchanger 140 disposed inside the HVAC module 101.

In addition, the third port 123 of the four-way valve is a refrigerant outlet that selectively communicates with the second port 122 and the fourth port 124 according to the air conditioning mode, and is disposed at the front end of the compressor 110 on the refrigerant flow. It is connected to the intermediate heat exchanger 180.

In addition, the fourth port 122 of the four-way valve is a refrigerant inlet and outlet that selectively communicates with the first port 121 and the third port 123 according to the air conditioning mode, and the refrigerant/electrical cooling water heat exchanger of the electrical component cooling circuit ( 111) are connected.

In addition, when each port of the four-way valve communicates with the first port 121 and the second port 122, the third port 123 communicates with the fourth port 124, and the first port 121 ) is in communication with the fourth port 124, the second port 122 is in communication with the third port 123.

Accordingly, when the first port 121 of the four-way valve communicates with the fourth port 124, the refrigerant discharged from the compressor 110 is transferred to the refrigerant/electrical cooling water heat exchanger 161 of the electrical component cooling circuit unit 160. ), and when the fourth port 124 communicates with the third port 123, the refrigerant passing through the refrigerant/electrical cooling water heat exchanger 161 of the electrical component cooling circuit is transferred to the front end of the compressor 110 on the refrigerant flow It is transferred to the intermediate heat exchanger 180 disposed in.

On the other hand, on the refrigerant line connecting the external heat exchanger 130 and the internal heat exchanger 140, a first branch point 181 at which the refrigerant discharged from the external heat exchanger 130 diverges or joins is provided, and a four-way valve ( A second branching point 182 is provided on the refrigerant line connecting the third port 123 of the 120 and the compressor 110, where the refrigerant passing through the 4-way valve 120 diverges or joins.

At this time, the second branch point 182 is preferably located at a position before the intermediate heat exchanger 180 so that the superheat and performance of the refrigerant discharged from the battery chiller 190 can be further increased.

In addition, a battery chiller 190 is mounted on a separate refrigerant branch line connecting the first branch point 181 and the second branch point 182, and the refrigerant discharged from the external heat exchanger 130 is removed according to the air conditioning mode. 2 The battery may be cooled through heat exchange in the battery chiller 190 by flowing into the expansion valve 191 .

In this case, the second expansion valve 191 installed on the side of the battery chiller 190 is a solenoid-type expansion valve capable of ON/OFF opening and closing operations and cannot adjust the amount of opening, or Like the first expansion valve 170 installed on the side of the internal heat exchanger 140, an electronic expansion valve (EEV) capable of adjusting the amount of opening by PID control may be used. In addition, a check valve 192 for preventing a reverse flow of the refrigerant may be mounted on a pipeline on the outlet side of the battery chiller 190 through which the refrigerant is discharged.

The intermediate heat exchanger 180 is also abbreviated as IHX (Intermediate Heat Exchanger), and is a configuration provided for heat exchange between the refrigerant before passing through the first expansion valve 170 and the internal heat exchanger 140 and the refrigerant after passing therethrough. .

The intermediate heat exchanger 180 is mounted between the first branch point 181 of the refrigerant line connecting the external heat exchanger 130 and the internal heat exchanger 140 and the external heat exchanger 130, depending on the air conditioning mode. The refrigerant discharged from the heat exchanger 130 is heat exchanged and then transferred to the internal heat exchanger 140, or the refrigerant discharged from the internal heat exchanger 140 is heat exchanged and then transferred to the external heat exchanger 130.

In this case, the intermediate heat exchanger 180 is heat exchanger in the form of a double pipe including an outer conduit for delivering refrigerant to the first expansion valve 170 and an inner conduit for conveying refrigerant to the accumulator 150 and the compressor 110. It may consist of groups. Here, a refrigerant having a relatively high pressure and temperature may flow in the outer conduit connected to the first expansion valve 170, and a refrigerant having a relatively low pressure and temperature may flow in the inner conduit.

Meanwhile, inside the HVAC module 101, a heater core 103 into which cooling water heated by the cooling water electric heater 104 flows is mounted. The heater core 103 is mounted inside the air flow path supplied to the interior of the vehicle, and applies heat to the air supplied to the interior of the vehicle when the air conditioning mode is a heating mode, dehumidification mode, or defrosting mode, and the heater core 103 The temperature of the cooling water supplied to the cooling water may be adjusted through PID control of the cooling water electric heater 104 by the control unit.

At this time, a second temperature sensor 108 capable of detecting a temperature around the heater core 103 is installed on the side of the heater core 103 . The second temperature sensor 108 detects the current temperature of the internal duct of the HVAC module 101 in which the heater core 103 is installed and transmits the detected temperature to the control unit, and the control unit transmits the second temperature sensor 108 The cooling water electric heater 104 may be PID controlled until the temperature around the heater core 103 detected through the above method reaches a set temperature value set by the user within an error range. In addition, a blower fan 102 capable of blowing air to the internal heat exchanger 140 and controlled by the control unit is installed inside the HVAC module 101 .

The electrical component cooling circuit unit 160 is controlled to operate when the air conditioning mode of the heat pump system is a heating mode or a cooling mode, and the refrigerant/electric component cooling water heat exchanger 161 uses electrical component cooling water in the cooling mode to operate as a water-cooled condenser, In heating mode, it operates as an evaporator that absorbs heat generated from electrical components.

Meanwhile, when the air conditioning system 100 is operated in the cooling mode, the control unit PID controls the compressor 110 until the difference between the target evaporator temperature according to the user's temperature setting and the current evaporation temperature converges within the error range, thereby cooling the room. can be performed.

That is, when the air conditioning system 100 is operated in the cooling mode, the internal heat exchanger 140 functions as an evaporator, and the control unit sets the temperature of the internal heat exchanger 140 functioning as an evaporator to the target evaporator temperature, and the internal heat exchanger (140) Room cooling by performing PID control of the RPM of the compressor 110 until the difference between the current evaporator temperature detected through a temperature sensor (not shown) installed around and the target evaporator temperature converges within a preset error range. can be performed.

Conversely, when the air conditioning system 100 is operated in the heating mode, the internal heat exchanger 140 functions as a condenser, and the control unit sets the temperature of the internal heat exchanger 140 functioning as a condenser to a target temperature, 1. Indoor heating is performed by performing PID control of the RPM of the compressor 110 until the difference between the current temperature of the internal heat exchanger 140 detected through the temperature sensor 107 and the target temperature converges within a preset error range. can do.

In addition, the control unit sets the temperature of the heater core 103 as a target temperature, and the difference between the current temperature of the heater core 103 detected through the second temperature sensor 108 and the target temperature falls within a preset error range. Room heating may be performed by performing PID control of the cooling water electric heater 104 until convergence.

Hereinafter, each air conditioning mode of the air conditioning system for an electric vehicle according to the present invention will be described in detail.

2 to 4 are refrigerant circulation flow charts illustrating respective refrigerant flows in a cooling mode, a heating mode, a cooling mode, and a battery cooling mode of the air conditioning system for an electric vehicle according to an embodiment of the present invention.

First, the case of the cooling mode shown in FIG. 2 will be described.

In the cooling mode, the flow of refrigerant is "compressor (110) - 4-way valve (120) - electrical component cooling circuit (160, refrigerant / electrical component cooling water heat exchanger (161) functions as a water-cooled condenser) - external heat exchanger (130, condenser) Function) - Intermediate heat exchanger (180) - Internal heat exchanger (140, functions as an evaporator) - 4-way valve (120) - Accumulator (150) - Compressor (110) It is controlled to flow in this order.

In the cooling mode, the 4-way valve 120 is a 4-way valve so that the refrigerant discharged from the compressor 110 is introduced into the external heat exchanger 130 and the refrigerant discharged from the internal heat exchanger 140 is introduced into the compressor 110 ( 120, the first port 121 communicates with the fourth port 124, and the second port 122 communicates with the third port 123.

Also, the internal heat exchanger 140 exchanges heat with the air supplied from the external heat exchanger 130 to the refrigerant delivered from the external heat exchanger 130 according to the air conditioning mode, or transfers the refrigerant discharged from the compressor 110 to the air supplied to the interior of the vehicle. will exchange heat with

Specifically, one port of the internal heat exchanger 140 discharges the refrigerant that absorbs heat from the air introduced into the HVAC module 101 according to the air conditioning mode, or the refrigerant for providing heat to the air supplied to the vehicle interior Functions as an inlet passage, and the other port introduces a refrigerant that absorbs heat from the air introduced into the HVAC module 101 according to the air conditioning mode, or discharges the refrigerant that provides heat to the air supplied to the interior of the vehicle. function as a passageway.

Here, when the air conditioning mode is operated in the cooling mode, the internal heat exchanger 140 functions as an evaporator, and the refrigerant transferred from the external heat exchanger 130 is expanded in the first expansion valve 170 and then It is drawn into the exchanger 140 and exchanges heat with the air supplied to the interior of the vehicle.

The accumulator 150 is installed between the intermediate heat exchanger 180 and the compressor 110, absorbs the refrigerant discharged from the internal heat exchanger 140 through the 4-way valve 120 and transfers it to the compressor 110.

In addition, the electrical component cooling circuit unit 160 may be operated when the air conditioning mode is a cooling mode, and in this case, the refrigerant/electronic component cooling water heat exchanger 161 is operated as a water-cooled condenser using the electrical component cooling water, so that the refrigerant/electronic component cooling water heat exchanger (161) The refrigerant inside can be further cooled, and the cooling performance can be improved.

Here, the cooling mode shown in FIG. 2 is an operation mode under an ambient temperature condition in which battery cooling is not required, and the second expansion valve 191 is closed to branch the outlet side refrigerant line of the intermediate heat exchanger 180. The battery cooling passage is not opened so that the refrigerant does not flow into the battery chiller 190 .

Next, with reference to FIG. 3, the heating mode of the present invention will be described.

In the case of heating mode, the flow of refrigerant is "compressor (110) - 4-way valve (120) - internal heat exchanger (140, functioning as a condenser) - external heat exchanger (130, functioning as an evaporator) - electrical component cooling circuit (160, refrigerant) / The cooling water heat exchanger 161 functions as an evaporator) - 4-way valve 120 - accumulator 150 - compressor 110" can be controlled to flow in this order.

The four-way valve 120 is a four-way valve 120 so that the refrigerant discharged from the compressor 110 flows into the internal heat exchanger 140 and the refrigerant discharged from the external heat exchanger 130 flows into the compressor 110. The first port 121 of is in communication with the second port 122, the third port 122 may be in communication with the fourth port (123).

In this way, when operated in the heating mode, the internal heat exchanger 140 functions as a condenser. The refrigerant discharged from the compressor 110 is condensed to exchange heat with the air supplied to the interior of the vehicle from the compressor 110. The discharged refrigerant is introduced into the internal heat exchanger (140).

In addition, heating performance can be improved by operating the coolant electric heater 104 to apply heat to the air supplied to the interior of the vehicle. At this time, as shown in FIG. 3, the heater core 103 is disposed in the HVAC module 101, and a cooling water line circulating through the heater core 103 is configured, but the cooling water electric heater 104 and the pump ( 105) and the coolant reservoir tank 106 may be disposed.

In this case, the accumulator 150 may absorb the refrigerant discharged from the electrical component cooling circuit unit 160 through the 4-way valve 120 and then transfer the refrigerant to the compressor 110 . In addition, in the electrical component cooling circuit unit 160, the refrigerant discharged from the external heat exchanger 130 absorbs heat generated from the electrical components mounted in the vehicle through heat exchange, and the refrigerant that has absorbed the heat turns the 4-way valve 120. It can be delivered to the accumulator 150 through.

When such a heating mode is operated in winter when the outdoor temperature is low, in general, since there is no need to cool the battery, the second expansion valve 191 is closed to prevent the flow of refrigerant toward the battery chiller 190. Avoid.

At this time, when battery cooling is required due to the battery itself or surrounding abnormalities, the battery cooling mode is switched to a battery cooling mode in which only the battery cooling operation is performed, and the heating can be performed only by the cooling water electric heater 104 .

In addition, when the vehicle is running, heat is generated from the electrical components, and when the refrigerant flows into the electrical component cooling circuit unit 160, the refrigerant/electric component cooling water heat exchanger 161 of the electrical component cooling circuit unit 160 functions as an evaporator, and the refrigerant absorbs heat generated from electrical components, reaches a relatively higher temperature state, and flows into the accumulator 150 and the compressor, thereby increasing the amount of heat generated in the internal heat exchanger 140, thereby further improving heating performance.

Next, with reference to FIG. 4 , a case in which the cooling mode and the battery cooling mode of the air conditioning system according to the present invention are performed at the same time will be described.

When the cooling mode and the battery cooling mode are performed at the same time, the flow of refrigerant is "compressor 110 - 4-way valve 120 - electrical component cooling circuit part (160, refrigerant / electrical component cooling water heat exchanger 161 functions as a water-cooled condenser) - External heat exchanger (130, functioning as a condenser) - Intermediate heat exchanger (180) - Internal heat exchanger (140, functioning as an evaporator) - Four-way valve (120) - Accumulator (150) - Compressor (110) Controlled, by branching the refrigerant line connecting between the intermediate heat exchanger 180 and the internal heat exchanger 140, a part of the branched refrigerant flows into the battery chiller 190 through the second expansion valve 191 to cool the battery. can make it happen

Here, when the air conditioning system is operated in a cooling mode, the internal heat exchanger 140 functions as an evaporator, and the refrigerant transferred from the external heat exchanger 130 is expanded through the first expansion valve 170 and then returned to the indoor heat exchanger. (140) It is introduced into the interior and exchanges heat with the air supplied to the interior of the vehicle.

Then, the accumulator 150 mounted between the intermediate heat exchanger 180 and the compressor 110 receives the refrigerant discharged from the internal heat exchanger 140 through the 4-way valve 120 and then transfers the refrigerant back to the compressor 110. will do

On the other hand, the refrigerant discharged from the external heat exchanger 130 expands through the second expansion valve 191 and becomes a low temperature state, and then is drawn into the battery chiller 190 and heat exchanges with the coolant circulating in the battery 194 to the battery. (194) is cooled.

In this case, the cooling water circulation pump 193, the battery 194, and the battery heater 195 are sequentially disposed in the battery cooling/heating cooling water circuit that exchanges heat with the battery chiller 190 to circulate the cooling water, and the battery chiller 190 will act as an evaporator.

As such, the condensed refrigerant passing through the external heat exchanger 130 expands through the first expansion valve 170 and the second expansion valve 191, and is passed to the internal heat exchanger 140 and the battery chiller 190 as low-temperature refrigerant, respectively. By being introduced, the air introduced into the HVAC module 101 is cooled to cool the room, and at the same time, the battery 194 can be cooled by a heat exchange action of the low-temperature refrigerant introduced into the battery chiller 190 . Then, the refrigerant heat-exchanged in the battery chiller 190 passes through the internal heat exchanger 140 and joins the refrigerant passing through the 4-way valve 120 at the second branching point 182 and flows into the intermediate heat exchanger 181.

In this way, when the cooling mode is operated, it is usually summer season when the outdoor temperature is high, and since the temperature of the battery 194 rises and the battery efficiency decreases, the second expansion valve 191 is opened to allow the refrigerant to flow and the refrigerant to expand. And, the expanded refrigerant passes through the battery chiller 190, which functions as an evaporator, to cool the cooling water in the battery cooling/heating cooling water circuit, and this cooling water is circulated to the cooling plate of the battery pack to prevent the battery pack from overheating. .

On the other hand, FIG. 5 shows that when the air conditioning system (heat pump system) of the present invention is operated in a heating mode in a low-temperature environment with a low outdoor temperature, the interior of the vehicle is warmed up through the simultaneous operation of the internal heat exchanger and the heater core. It is a conceptual diagram showing that

As shown in FIG. 5, in the air conditioning system 100 of the present invention constituting the heat pump system by applying the four-way valve 120, when the air conditioning system 100 is operated in the heating mode, the external heat exchanger 130 Functions as an evaporator, and the internal heat exchanger 140 functions as a condenser. When the outside air temperature of the vehicle is in a low-temperature environment of -20 degrees or less, the internal heat exchanger 140 ) and the heater core 103 can be controlled to operate simultaneously.

In this case, due to the characteristics of the refrigerant in the heat pump system, the characteristics of the refrigerant are changed due to the influence of the outdoor temperature, or the temperature deviation (amount of temperature decrease) according to the positions of the internal heat exchanger 140 and the heater core 103 and the HVAC module (101) Even if the heat pump is driven under the set control conditions when the heat pump is actually driven, a certain degree of deviation may occur in the indoor temperature felt by the user due to a temperature deviation due to a difference in the shape of the internal flow path and the discharge air volume.

Therefore, in the present invention, when the heat pump system is operated in an environment where the outside air temperature of the vehicle is low, the indoor warm-up is quickly performed, so that the occupant does not feel uncomfortable due to the indoor temperature deviation, and the vehicle interior is kept at a comfortable temperature. It provides an air conditioning system control method that can create an environment.

That is, in the air conditioning system control method of the present invention, when the current outside air temperature of the vehicle is within a set temperature range, the temperature obtained by adding the first compensation temperature value to the set temperature value set by the user is the target temperature of the internal heat exchanger 140. The target temperature is set to PID control the RPM of the compressor 110 with high output for a certain period of time, and at the same time, another second compensation temperature value different from the first compensation temperature value is set to the user's set temperature value. By setting the added temperature as the target temperature of the heater core 103 and PID controlling the coolant electric heater 104 with high output for a certain period of time, simple and simple control logic even in a low-temperature environment where the outside air temperature of the vehicle is low Through this, you can quickly warm up indoors. In addition, after the warm-up as described above, in a state where the indoor temperature is stabilized by PID control, the temperature around the internal heat exchanger 140 is maintained at a higher temperature than the temperature around the heater core 103, so that the electric coolant heater 104 is almost Since it can be implemented with non-operational logic, power consumption can also be minimized.

On the other hand, when the air conditioning system 100 changes settings to the user heating mode while operating in the cooling mode, or is switched to the heating mode according to the operating conditions set in the controller, the internal heat exchanger 140 that functions as an evaporator in the cooling mode ) is suddenly changed from the heating mode to the condenser function, and the water droplets (moisture) stored when the internal heat exchanger 140 is in the evaporator state are rapidly evaporated, resulting in flash fogging that forms like fog on the windshield of the vehicle. Fogging may occur. Such flash fogging obscures the driver's vision, causing a risk of safety accidents while driving, and is also the main reason why heat pump systems with four-way valves applied to existing vehicles could not be used.

In the present invention, in order to solve the flash fogging phenomenon occurring in the heat pump system to which the four-way valve is applied, the air conditioning system 100 is switched to the heating mode by the user's settings or other set operating conditions while operating in the cooling mode. In this case, it enters a separately set mode called 'Inner HEX dry mode' before operating in earnest in heating mode to dry the moisture contained in the internal heat exchanger 140. can do.

6 is a flow chart showing a control process of the air conditioning system in which the control logic for preventing flash fogging and the control logic for rapid warm-up in a low-temperature outdoor environment are simultaneously reflected in the air conditioning system of the present invention when operating in a heating mode. In addition, FIG. 7 is a PID control of the compressor and the cooling water electric heater by setting the temperature obtained by adding a specific compensation temperature value to the set temperature value set by the user in the flow chart of FIG. 6 as the target temperature value of the internal heat exchanger and heater core. It is a diagram expressed as a mathematical relationship.

6 and 7 , in the air conditioning system control method according to the present invention, first, it is determined whether the current air conditioning mode is set to a cooling mode (AC ON) or a heating mode (HEAT ON) (S210).

Here, when it is confirmed that the current air conditioning mode is set to the heating mode, it is determined whether the outside air temperature of the vehicle is within the set temperature range (S221).

At this time, the set temperature range is an outdoor temperature range that is a condition for entering the inner heat exchanger dry mode (Inner HEX dry mode), for example, the outdoor temperature range may be -25 degrees <outside temperature <15 degrees. .

And, if it is confirmed that the current outside air temperature of the vehicle is within the set temperature range, next, it is determined whether or not a request to enter the inner heat exchanger drying mode (Inner HEX dry mode) has been received (S222).

In this case, the request to enter the internal heat exchanger drying mode is made when the air conditioning mode position is switched from the cooling mode to the heating mode, or when the battery, which is the driving source of the electric vehicle, is reset. A request to enter the internal heat exchanger drying mode may be received in a step before full-scale operation of the internal heat exchanger mode.

At this time, if it is determined in step (S221) that the current outside air temperature of the vehicle does not exist within the set temperature range, or if it is determined that the request for entering the internal heat exchanger drying mode is not received in step (S222), Without entering the internal heat exchanger drying mode, the temperature at which the first compensation temperature value is added to the set temperature value set by the user is set as the target temperature value of the internal heat exchanger 140, and the compressor 110 for a certain period of time While PID controlling the RPM with high output, the temperature obtained by adding the second compensation temperature value to the set temperature value is set as the target temperature value of the heater core 103 so that the cooling water electric heater 104 can operate for a certain period of time. It is possible to perform warm-up according to indoor heating by PID control with high output. (S224, S225)

In this case, unlike the control logic shown in FIG. 6, it is determined that the current outside air temperature of the vehicle is not within the set temperature range in step (S221) or a request to enter the internal heat exchanger drying mode is requested in step (S222). When it is determined that the first temperature compensation value and the second temperature compensation value are not received, the compressor 110 and the cooling water electric heater 104 are operated under the operating conditions set in the heat pump system for indoor heating without applying the first temperature compensation value and the second temperature compensation value. It can also be controlled to perform a normal heating mode operation for

Next, when it is confirmed that the request to enter the internal heat exchanger drying mode has been received in the step (S222), the internal heat exchanger drying mode is entered and the internal heat exchanger 140 is dried for a set time. (S223)

At this time, the internal heat exchanger drying operation performed after entering the internal heat exchanger drying mode is, for example, the heater core 103 located inside the HVAC module 101 by operating the cooling water electric heater 104 in the first step. Through this, it is possible to perform dehumidification and indoor heating of the internal heat exchanger 140 for a certain period of time. In this case, with the dehumidification of the internal heat exchanger 140 by the heater core 103, the blower fan 102 provided inside the HVAC module 101 is driven in two or more stages to remove the heat from the internal heat exchanger 140. It can assist in dehumidifying action. Next, in the second step, the compressor 110 operating in the heat pump system (heating mode) may be operated at minimum RPM for a predetermined period of time to remove residual moisture from the internal heat exchanger 140 (S223).

Then, when all the internal heat exchanger drying operations in the step (S223) are completed, the temperature obtained by adding the first compensation temperature value to the set temperature value set by the user is set as the target temperature value of the internal heat exchanger 140, and the compressor ( 110) is PID controlled with high output, and at the same time, the temperature obtained by adding the second compensation temperature value to the set temperature value is set as the target temperature value of the heater core 103 to PID control the coolant electric heater 104 with high output. By doing so, warm-up according to indoor heating can be performed. (S224, S225)

At this time, in some cases, after the drying operation of the internal heat exchanger in step (S223) is completed, the compressor 110 and the cooling water electric heater 104 are operated without applying the first temperature compensation value and the second temperature compensation value. It can also be controlled to perform a normal heating mode operation under the operating conditions set in the heat pump system.

On the other hand, if it is confirmed in the step (S210) that the current air conditioning mode is set to the cooling mode, the room can be cooled by operating in the normal cooling mode according to the set cooling mode operating conditions (S212).

At this time, the control unit determines whether a position change to the heating mode has occurred while operating in the indoor cooling mode (S214),

If it is confirmed that the position conversion to the heating mode has occurred, the internal heat exchanger enters the drying mode to perform the drying operation of the internal heat exchanger 140 (S223), and if it is confirmed that the position conversion to the heating mode does not occur , It can operate in the set normal cooling mode. (S212)

In this case, whether or not the position change from the cooling mode to the heating mode has occurred in step S214 can be determined based on whether or not the position of the 4-way valve 120 has changed.

On the other hand, regardless of the situation in which the position of the air conditioning mode from the cooling mode to the heating mode is changed, when the battery reset (S226) of the vehicle is performed, the internal heat exchanger drying mode of the step (S223) is immediately entered. Thus, dehumidification of the internal heat exchanger 140 may be performed.

In addition, while the air conditioning system 100 is operated in the internal heat exchanger drying mode as described above, the air conditioning mode is changed to the defrost (DEF) mode or the cooling mode (AC mode) by a user's manipulation, or the air conditioning system 100 When the operation is turned OFF, the operation of the drying mode of the internal heat exchanger that is currently in progress can be stopped.

In addition, during the drying operation of the internal heat exchanger in the step (S223), the defrost mode or cooling mode is changed by a user's operation or other set operating conditions, or the operation of the air conditioning system 100 is When turned off (S227), the drying operation of the internal heat exchanger 140 currently operating in the drying mode can be stopped (S228).

In this way, when the air conditioning system 100 is switched from the cooling mode to the heating mode, or when the battery is reset, the 'internal heat exchanger drying mode' is entered and the internal heat exchanger 140 is naturally dried only with the heater core 103 for a certain period of time. In the heating mode (heat pump mode), the compressor 110 is operated at minimum RPM for a certain period of time to completely remove the remaining moisture in the internal heat exchanger 140, and the internal heat exchanger 140 is dried. When the drying operation of the exchanger 140 is completed, it is controlled to operate in the normal heating mode again, thereby effectively suppressing the phenomenon of flash fogging on the windshield of the vehicle, thereby providing driving safety while driving the vehicle. there is.

In addition, when all the drying operations of the internal heat exchanger 140 are completed, the temperature obtained by adding the first compensation temperature value to the set temperature value set by the user is set as the target temperature value of the internal heat exchanger 140, and the compressor ( 110) is PID-controlled with high output, and at the same time, the temperature obtained by adding the second compensation temperature value to the set temperature value is set as the target temperature value of the heater core 103 to operate the coolant electric heater 104 with high output for a certain period of time. By PID control, even in a low-temperature environment where the outside air temperature of the vehicle is low, it is possible to quickly warm up the interior through a simple and simple control logic, thereby creating a rapid indoor heating environment for the occupants of the vehicle. It can provide a quicker feeling of comfort.

In addition, as described above, when the PID control of the compressor 110 and the cooling water electric heater 104 is performed with the compensated temperature value for a certain period of time, and the room temperature is stabilized, the ambient temperature of the internal heat exchanger 140 changes around the heater core 103. Since the temperature can be maintained at a higher temperature than the temperature, the cooling water electric heater 104 can be implemented with logic that hardly operates, and through this, power consumption of the battery can be reduced.

In addition, according to the air conditioning system control logic of the present invention, the target temperature of the internal heat exchanger 140 and the heater core 103 is controlled through a simple control logic regardless of various constraint conditions or driving environments according to the operation of the heat pump system. ) can be controlled, and a high level of low-temperature fuel efficiency can be achieved even in a low-temperature environment with a low total mileage, which has the effect of increasing the low-temperature mileage by 80% or more compared to room temperature.

In addition, in some vehicles equipped with the existing heat pump system, whenever the air conditioning system is turned off, the internal heat exchanger is set to dry mode, so the domestic electric vehicle low-temperature mileage certification test standard air conditioning power consumption was as high as 6.819 kwh. However, when the above-described control logic for preventing flash fogging of the present invention is used, it is possible to perform the drying operation of the internal heat exchanger by selectively entering the internal heat exchanger drying mode according to the judgment conditions, so that domestic electric vehicle low-temperature mileage certification test Since the standard air conditioning power consumption is reduced to about 5.111 kwh, it is possible to implement a power consumption reduction of about 25%.

Meanwhile, in the air conditioning system 100 of the present invention, when the cooling mode and the battery cooling mode of FIG. 4 are performed simultaneously, the cooling of the battery occurs when the battery 194 overheats to a set temperature or higher, the battery control unit (Battery Management A battery cooling request signal is received from the system (BMS), and indoor cooling can be performed simultaneously. That is, when the battery cooling request is received from the battery control unit while the air conditioning system 100 is operating in the cooling mode, the control unit transmits a control signal to open the second expansion valve 191 located on the battery chiller 190 side and open the battery chiller 190. A low-temperature refrigerant is supplied to 190 to perform battery cooling through heat exchange action of chiller 190 .

At this time, the second expansion valve 191 located on the side of the battery chiller 190 is not an electronic expansion valve that can adjust the amount of opening like the first expansion valve 170 located on the side of the internal heat exchanger 140, but a solenoid type. When used as an expansion valve that can only be operated by ON/OFF opening and closing and cannot adjust the amount of opening, the battery cooling mode is entered and the second expansion valve 191 is suddenly opened, the external heat exchanger 130 ), as a part of the refrigerant supplied to the internal heat exchanger 140 flows into the battery chiller 190 and the flow rate of the refrigerant toward the internal heat exchanger 140 temporarily decreases, a phenomenon in which indoor cooling performance is temporarily lowered may occur. .

In the present invention, in order to compensate for this, when a battery cooling request is received during operation in the cooling mode and the battery cooling mode is entered, the controller opens the second expansion valve 191 to cool the battery, and at the same time, the compressor currently under PID control. By adding a specific compensation RPM value corresponding to the cooling load (total capacity of the battery pack) of the battery 194 to the RPM of 110, that is, a predetermined specific compensation RPM value capable of compensating the cooling load of the battery 194 By controlling the PID control of the compressor 110 with high output for a certain period of time, it is possible to compensate for a deterioration in indoor cooling performance due to a sudden refrigerant change when the second expansion valve 191 is opened.

At this time, when the battery cooling mode is entered as described above, the battery control unit (BMS) transfers a predetermined compensation RPM value capable of compensating for the cooling load of the battery 194 to the compressor 110, thereby adding compensation. PID control of the compressor 110 may be performed with high output for a predetermined time through the RPM value.

And, when the cooling of the battery is finished, the control unit closes the second expansion valve 191 to induce the flow of refrigerant only toward the internal heat exchanger 140. In this case, a state in which a specific compensation RPM value is applied in the battery cooling mode As the furnace compressor 110 is operated at high output, the amount of refrigerant continuously increases, and thus, excessive cooling of the room may occur.

Therefore, when the cooling of the battery is finished, the control unit controls the PID control value of the compressor 110 under PID control with high output to return to its original state (a state that operates only in the cooling mode) by applying the current compensation RPM value to the evaporator. By reducing the amount of refrigerant directed to the refrigerant path, it is possible to minimize a rapid drop in temperature in the room due to the return of the refrigerant path, and also reduce other power consumption for driving the compressor 110 with high power.

Although preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art can make appropriate changes within the scope described in the claims of the present invention. this will be possible

100: air conditioning system 101: HVAC module
102: blower fan 103: heater core
104: cooling water electric heater 107: first temperature sensor
108: second temperature sensor 110: compressor
120: 4-way valve 130: external heat exchanger
140: internal heat exchanger 150: accumulator
160: electrical cooling circuit part 170: first expansion valve
180: intermediate heat exchanger 190: battery chiller
191: second expansion valve 194: battery

Claims (14)

(a) determining whether the current air conditioning mode is set to a cooling mode or a heating mode;
(b) determining whether the current outdoor temperature is within a set range when the current air conditioning mode is set to the heating mode;
(c) When the current outdoor temperature is within the set range, the temperature obtained by adding the first compensation temperature to the set temperature value set by the user is set as the target temperature value of the internal heat exchanger to perform PID control of the compressor for a certain period of time. at the same time, setting a temperature obtained by adding a second compensation temperature value to the set temperature value as a target temperature value of the heater core and performing PID control of the cooling water electric heater for a predetermined time;
An air conditioning system control method for an electric vehicle, comprising:
The method of claim 1, when the current outdoor temperature is within the set range in step (b),
Determining whether a request to enter the internal heat exchanger drying mode has been received, and if it is confirmed that the request to enter the internal heat exchanger drying mode has been received, entering the internal heat exchanger drying mode and performing a drying operation of the internal heat exchanger for a set time ( b-1);
A method for controlling an air conditioning system of an electric vehicle, further comprising:
The method of claim 2, after entering the internal heat exchanger drying mode in step (b-1),
In the first step, the heater core and blower fan inside the HVAC module are operated for a certain period of time to dehumidify the internal heat exchanger and heat the room,
A method for controlling an air conditioning system of an electric vehicle, characterized in that in a second step, the compressor is operated at a set minimum RPM for a predetermined time to remove residual moisture in the internal heat exchanger.
The method of claim 2, wherein during the drying operation of the internal heat exchanger in step (b-1), the defrosting mode or the cooling mode is changed by a user's manipulation or a set condition, or the air conditioning system is turned off. An air conditioning system control method for an electric vehicle, characterized in that in case of stopping the drying operation of the internal heat exchanger.
3. The method of claim 2, wherein when the battery is reset, the internal heat exchanger drying mode of the step (b-1) is entered and the internal heat exchanger is dried.
The method of claim 2, wherein in step (a), it is confirmed that the current air conditioning mode is set to the cooling mode, and determining whether a position switch to the heating mode has occurred while operating in the set normal cooling mode (a) -1) A method for controlling an air conditioning system of an electric vehicle, characterized in that it further comprises.
7. The method of claim 6, wherein the determination of whether or not a position change to the heating mode has occurred in step (a-1) is based on whether or not a position change of the 4-way valve has occurred.
The method of claim 6, wherein when it is determined that the position conversion to the heating mode has occurred in step (a-1), the drying operation of the internal heat exchanger is performed by entering the drying mode of the internal heat exchanger in step (b-1), ,
An air conditioning system control method for an electric vehicle, characterized in that operating in a set normal cooling mode when it is determined that the position conversion to the heating mode has not occurred.
A compressor that compresses and discharges the refrigerant;
a four-way valve for transferring the refrigerant discharged from the compressor to an external heat exchanger or an internal heat exchanger according to an air conditioning mode;
an external heat exchanger that exchanges heat with air outside the vehicle for the refrigerant transferred from the compressor or the internal heat exchanger;
an internal heat exchanger that exchanges heat between the refrigerant transferred from the external heat exchanger and air supplied into the HVAC module, or exchanges heat between the refrigerant discharged from the compressor and the air supplied into the HVAC module;
a first temperature sensor installed on the side of the internal heat exchanger to detect a temperature around the internal heat exchanger;
a heater core installed at a position spaced apart from the internal heat exchanger, supplied with cooling water heated by an electric cooling water heater, and heating air discharged through the internal heat exchanger;
a second temperature sensor installed on the side of the heater core to detect a temperature around the heater core;
a blower fan installed inside the HVAC module and blowing air to the internal heat exchanger;
A control unit controlling the compressor, the cooling water electric heater, and the blower fan based on the temperature values detected by the first temperature sensor and the second temperature sensor;
The control unit,
When the current outside air temperature is within the set range, the temperature obtained by adding the first compensation temperature to the set temperature set by the user is set as the target temperature of the internal heat exchanger to PID control the compressor for a certain period of time. , The air conditioning system of an electric vehicle, characterized in that PID control of the cooling water electric heater for a predetermined time by setting the temperature obtained by adding the second compensation temperature value to the set temperature value as the target temperature value of the heater core.
10. The method of claim 9, wherein the control unit determines whether a request to enter the internal heat exchanger drying mode has been received when the current outside air temperature is within a set range, and confirms that the request to enter the internal heat exchanger drying mode has been received. , the air conditioning system of an electric vehicle, characterized in that it enters an internal heat exchanger drying mode and controls to perform a drying operation of the internal heat exchanger for a set time.
11. The method of claim 10, wherein the controller, after entering the internal heat exchanger drying mode,
In a first step, the heater core and the blower fan inside the HVAC module are operated for a predetermined period of time to control the internal heat exchanger to dehumidify and heat the room,
The air conditioning system of an electric vehicle, characterized in that in the second step, the compressor is operated at a set minimum RPM for a predetermined time to remove residual moisture from the internal heat exchanger.
11. The method of claim 10, wherein the control unit, while performing a drying operation of the internal heat exchanger, changes to a defrost mode or a cooling mode by a user's manipulation or a set condition, or when an air conditioning system is turned off, the internal heat exchanger is turned off. An air conditioning system for an electric vehicle characterized by controlling to stop a drying operation of an exchanger.
11 . The air conditioning system of claim 10 , wherein the control unit controls the internal heat exchanger to enter the internal heat exchanger drying mode and perform a drying operation of the internal heat exchanger when the battery is reset.
The method of claim 11, wherein the control unit controls the internal heat exchanger to enter the internal heat exchanger drying mode and perform a drying operation of the internal heat exchanger when it is determined that a position change from the cooling mode to the heating mode has occurred,
An air conditioning system for an electric vehicle characterized by controlling to operate in a set normal cooling mode when it is determined that a position change from a cooling mode to a heating mode has not occurred.

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