KR101520328B1 - Control method of heat pump system for vehicle - Google Patents

Abstract

The present invention relates to a control method for a vehicle heat pump system. More particularly, the present invention relates to a control method for a vehicle heat pump system, in which, in a heat pump mode, cooling water of an electrical component cooling apparatus is supplied to a refrigerant- Cooling water heat exchanger and the flap door to raise the temperature of the refrigerant flowing into the outdoor heat exchanger to increase the temperature of the icing of the outdoor heat exchanger by increasing the temperature of the refrigerant flowing into the outdoor heat exchanger by using the refrigerant- And more particularly to a control method of a heat pump system for a vehicle which can improve the cooling performance of the electric components by lowering the cooling water temperature of the electric components.

Description

Technical Field [0001] The present invention relates to a control method of a heat pump system for a vehicle,

The present invention relates to a control method for a vehicle heat pump system. More particularly, the present invention relates to a control method for a vehicle heat pump system, in which, in a heat pump mode, cooling water of an electrical component cooling apparatus is supplied to a refrigerant- To a control method for a vehicle heat pump system in which a flap door provided on the front side of the flap door is opened or closed depending on the outside air temperature.

Background Art [0002] A vehicle air conditioner generally includes a cooling system for cooling the interior of a vehicle and a heating system for heating the interior of the vehicle. Wherein the cooling system is configured to cool air in the vehicle interior by exchanging air passing through the outside of the evaporator at the evaporator side of the refrigerant cycle with the refrigerant flowing in the evaporator to convert into cool air, The air passing through the outside of the core is exchanged with the cooling water flowing in the inside of the heater core to warm the inside of the vehicle.

2. Description of the Related Art Recently, an electric vehicle or a hybrid vehicle has been applied to a heat pump system which can selectively perform cooling and heating by changing the flow direction of a refrigerant by using one refrigerant cycle, For example, two heat exchangers (that is, an indoor heat exchanger installed inside the air conditioner case to exchange heat with the air blown into the passenger compartment, and an outdoor heat exchanger for exchanging heat outside the air conditioner case) And a flow path switching valve. Therefore, when the cooling mode is operated according to the flow direction of the refrigerant by the flow path switching valve, the indoor heat exchanger functions as a cooler. When the heating mode is activated, the indoor heat exchanger functions as a heater.

Various kinds of such a heat pump system for vehicles have been proposed, and a representative example thereof is shown in Fig.

1 includes a compressor 1 for compressing and discharging a refrigerant, an indoor heat exchanger 2 for dissipating the refrigerant discharged from the compressor 1, an indoor heat exchanger 2 for heating the refrigerant discharged from the indoor heat exchanger 2, An outdoor heat exchanger 4 for externally exchanging the refrigerant passing through the expansion valve 3 and an outdoor heat exchanger 4 for expanding the refrigerant passing through the compressor 1 according to an air conditioning mode or a heat pump mode, And a flow path switching valve 5 for switching the flow direction of the refrigerant discharged from the flow path switching valve 5.

FIG. 1 shows the refrigerant circulation path in the heat pump mode, and the refrigerant flows in the opposite direction during the air conditioning mode.

1, the indoor heat exchanger 2 functions as a radiator, and is installed inside the air conditioning case to heat the air supplied to the passenger compartment to be heated, and the outdoor heat exchanger 4, Is installed outside the air conditioning case to serve as a cooler.

Therefore, in order to improve the heat radiation performance of the indoor heat exchanger 2 and improve the heating performance, the outdoor heat exchanger 4 performs heat absorption function, and the indoor heat exchanger 2 performs heat radiation. The endothermic action of the base 4 must be performed smoothly.

However, in the conventional vehicle heat pump system, the indoor heat exchanger (2) serves as a heater to perform heating in a heat pump mode (heating mode), and the outdoor heat exchanger (4) And a cooler installed on the front side of the engine room of the vehicle for heat exchange with the outside air.

At this time, as the temperature of the refrigerant flowing into the outdoor heat exchanger (4) exchanges heat with the outside air, the surface of the outdoor heat exchanger (4) falls below the freezing point, and icing is performed on the surface of the outdoor heat exchanger Begins to occur.

If the icing is continuously expanded on the surface of the outdoor heat exchanger 4, the outdoor heat exchanger 4 can not absorb heat, so that the refrigerant temperature in the system is lowered and the heat radiation performance of the indoor heat exchanger 2 is lowered, As a result, there is a problem that the temperature of the air discharged into the vehicle room is lowered and the heating performance is remarkably reduced.

On the other hand, in electric vehicles and the like, a separate electric component cooling apparatus using cooling water is installed for cooling the vehicle electrical equipment (not shown). However, since it operates separately without being linked with the heat pump system, .

In order to solve the above problems, an object of the present invention is to provide a cooling device for a cooling device that supplies cooling water of an electrical component cooling device to a refrigerant-cooling water heat exchanger side in accordance with the degree of decrease in wind speed to vehicle speed, Cooling water heat exchanger and the flap door to raise the temperature of the refrigerant flowing into the outdoor heat exchanger to prevent icing of the outdoor heat exchanger from occurring, And the cooling effect of the electric component can be improved by lowering the cooling water temperature of the electric component.

According to an aspect of the present invention, there is provided an air conditioner comprising: a cooling and heating device for performing an air conditioning mode and a heat pump mode by connecting a compressor, an indoor heat exchanger, an expansion valve, an outdoor heat exchanger, Cooling water heat exchanger for mutually exchanging heat between the refrigerant of the cooling / heating device and the cooling water of the electrical equipment cooling device, and an electric vehicle cooling device for cooling the vehicle electric device by connecting the water pump, the radiator and the vehicle electric device on the line, A method for controlling a pump system, the method comprising: a first step of determining whether a temperature of the vehicle electrical component is lower than a first set temperature in a heat pump mode; A second step of determining whether the outside air temperature is higher than a second set temperature, A third step of determining whether the rate of decrease of the wind speed with respect to the vehicle speed is greater than a set value by measuring an air flow upstream of the outdoor heat exchanger in the air flow direction if the degree of the wind speed is higher than a second set temperature, A fourth step of maximally opening a coolant supply passage for supplying coolant to the coolant / coolant heat exchanger if the rate of decrease of the wind speed is greater than a set value; and a fourth step of, if a decrease rate of the wind speed A fifth step in which the opening amount of the cooling water supply path is made to be smaller than the maximum opening amount and the opening amount of the cooling water supply path set according to the decreasing rate gradually decreases when the reduction rate gradually decreases .

According to the present invention, in the heat pump mode, the cooling water of the electrical component cooling apparatus is supplied to the refrigerant-coolant heat exchanger side in accordance with the rate of decrease of the wind speed with respect to the vehicle speed and the flap door provided at the front side of the outdoor heat exchanger is opened or closed Cooling water heat exchanger and the flap door to raise the temperature of the refrigerant flowing into the outdoor heat exchanger to prevent icing of the outdoor heat exchanger and to improve the heating performance and to improve the cooling water temperature The cooling effect of the electric component can be improved.

1 is a schematic view showing a conventional heat pump system for a vehicle,
FIG. 2 is a diagram showing an air conditioner mode in a heat pump system for a vehicle according to the present invention,
3 is a diagram showing a heat pump mode in a vehicle heat pump system according to the present invention,
4 is a flowchart showing a control method of a heat pump system for a vehicle according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, the vehicular heat pump system according to the present invention includes an air conditioner 10, an electric component cooler 20, and a refrigerant-coolant heat exchanger 30 connected to each other, and is applied to an electric car or a hybrid vehicle .

The cooling / heating apparatus 10 includes a compressor 11, an indoor heat exchanger 12, an expansion valve 13, an outdoor heat exchanger 14, and a flow path switching valve 15 on a refrigerant circulation line R1, To perform an air conditioner mode and a heat pump mode (heating mode).

2, the refrigerant discharged from the compressor 11 passes through the flow path switching valve 15, the outdoor heat exchanger 14, the expansion valve 13, and the indoor heat exchanger 12 again And is sucked into the compressor (11).

At this time, the outdoor heat exchanger (14) serves as a radiator and the indoor heat exchanger (12) serves as a radiator.

3, the refrigerant discharged from the compressor 11 flows through the flow path switching valve 15, the indoor heat exchanger 12, the expansion valve 13, and the outdoor heat exchanger 14 again in the heat pump mode And is sucked into the compressor (11).

At this time, the outdoor heat exchanger 14 serves as a cooler and the indoor heat exchanger 12 serves as a radiator.

In this way, the flow direction of the refrigerant can be reversed through the flow path switching valve 15 to perform the air conditioning mode and the heat pump mode.

The refrigerant circulation lines R1 and R2 are respectively provided with a refrigerant circulation line R1 through which the refrigerant flows in the air conditioning mode and a refrigerant circulation line R2 through which the refrigerant flows in the heat pump mode. The compressor 11, the indoor heat exchanger 12, the expansion valve 13, and the outdoor heat exchanger (not shown) are connected to the refrigerant circulation lines R1 and R2. 14) is shared.

At this time, although no reference numerals are shown in the drawing, a flow path switching valve is provided at an intersection point where the refrigerant circulation lines R1 and R2 meet to change the flow direction of the refrigerant according to the air conditioning mode or the heat pump mode.

The compressor 11 receives the power from the engine (internal combustion engine, motor, or the like), sucks the refrigerant while compressing it, and discharges the compressed refrigerant in a state of high temperature and high pressure.

The compressor 11 sucks and compresses the refrigerant discharged from the indoor heat exchanger 12 in the air conditioning mode and supplies the compressed refrigerant to the outdoor heat exchanger 14. In the heat pump mode, And then supplies the refrigerant to the indoor heat exchanger 12 side.

The indoor heat exchanger 12 is installed inside an air conditioning case (not shown) to serve as a cooler in the air conditioning mode and as a radiator in the heat pump mode. Accordingly, in the air conditioner mode, air flowing in the air conditioner case is cooled by cooling, and in the heat pump mode, air flowing in the air conditioner case is heated to be heated.

The expansion valve 13 is installed on the refrigerant circulation lines R1 and R2 between the indoor heat exchanger 12 and the outdoor heat exchanger 14 to expand the refrigerant.

The outdoor heat exchanger 14 is installed outside the air conditioning case, that is, on the front side of the vehicle engine room, exchanges the refrigerant flowing in the inside with the outside air, serves as a radiator in the air conditioning mode, At the time, it serves as a cooler. In the air conditioner mode, heat is exchanged with the outside air to radiate heat, and in the heat pump mode, heat is absorbed from the outside air.

The electric component cooling apparatus 20 is constructed by connecting a water pump 21, a radiator 22 and a vehicle electric component 23 on a cooling water circulation line W. The vehicle electric component 23, .

The radiator 22 is installed on the downstream side in the air flow direction of the outdoor heat exchanger 14 and cools the inside of the cooling water while exchanging heat with the outside air.

The vehicle electrical component 23 is typically a motor, a battery, an inverter, or the like.

Therefore, when the water pump 21 is activated, the cooling water discharged from the water pump 21 passes through the radiator 22 and is cooled by heat exchange with the outside air, and then flows into the electric component 23, And then flows into the water pump 21 again to be recirculated.

On the other hand, a water-cooled heat exchanger (24) may be further provided on the cooling water circulation line (W).

The refrigerant-cooling water heat exchanger 30 exchanges heat between the refrigerant of the cooling / heating unit 10 and the cooling water of the electrical equipment cooling apparatus 20 to change the temperature of the refrigerant flowing into the outdoor heat exchanger 14 Thereby preventing the generation of icing of the outdoor heat exchanger 14 and lowering the temperature of the cooling water flowing into the electric component 23 to improve the cooling performance of the electric component 23. [

The refrigerant-cooling water heat exchanger 30 is a water-cooled heat exchanger for exchanging heat between the refrigerant and the cooling water, and is connected to the refrigerant circulation lines R1 and R2 connecting the expansion valve 13 and the outdoor heat exchanger 14 Respectively.

In order to supply cooling water circulating through the electric component cooling apparatus 20 to the refrigerant-cooling water heat exchanger 30, a cooling water supply passage W1 is provided in parallel on the cooling water circulation line W, And is connected to the heat exchanger (30).

A flow control valve 31 is provided on the inlet and outlet sides of the cooling water supply passage W1 so that the refrigerant circulating through the cooling water circulation line W is selectively supplied to the refrigerant- And the supplied flow rate can also be controlled.

That is, when the flow control valve 31 is opened, cooling water having passed through the radiator 22 is supplied to the refrigerant-cooling water heat exchanger 30 through the cooling water supply flow path W1, And then flows into the electric component 23,

When the flow control valve 31 is closed, the cooling water having passed through the radiator 22 flows into the electric component 23 immediately.

A flap door (40) is installed on the upstream side of the outdoor heat exchanger (14) in the air flow direction.

The flap door (40) is provided on the bumper side in front of the vehicle, and can supply or shut off the outside air to the outdoor heat exchanger (14) side when the vehicle travels. Of course, it is also possible to control the supply of outside air.

Four flap doors 40 are provided so as to face the front surface of the outdoor heat exchanger 14. At this time, the flap doors 40 correspond to the four positions of the upper, lower, left, and right sides of the outdoor heat exchanger 14 Respectively.

Although four flap doors 40 are shown in a row for the sake of convenience, the flap doors 40 are installed at four positions on the front face of the outdoor heat exchanger 14 in the up, down, left, and right directions. That is, two left, right, top, left and right sides of the front side of the outdoor heat exchanger 14 are provided.

Therefore, the flap door 40 is opened when the outdoor air temperature is higher than 10 ° C, and is closed when the outdoor air temperature is lower than 10 ° C to allow the outdoor heat exchanger 14 to be thawed, The cooling effect of the electrical component 23 can be increased by supplying the outside air to the radiator 22 by opening the flap door 40 under a higher condition.

An anemometer 50 is provided between the flap door 40 and the outdoor heat exchanger 14 to measure the wind speed at a position corresponding to the position of each of the flap doors 40.

Four are provided at the positions corresponding to the aeroelastic flap door 40 in which the four flap doors 40 are installed. In the figure, four anemometers 50 are shown in a line for convenience.

When the anemometer 50 is installed on the upstream side of the outdoor heat exchanger 14 in the air flow direction, the air speed at the time of vehicle traveling can be known. When icing occurs in the outdoor heat exchanger 14, The wind speed of the wind turbine is reduced.

Therefore, when the anemometer 50 is installed at four positions of the upper, lower, left, and right sides of the front surface of the outdoor heat exchanger 14, the site where the icing occurs can be easily known. So that the flap door 40 can be opened or closed depending on the outside air temperature.

Hereinafter, a control method of the vehicle heat pump system according to the present invention will be described.

When the heat pump system is operated, that is, when the heat pump mode (heating mode) is activated, the first step S1 of determining whether the temperature of the vehicle electrical component 23 is lower than the first set temperature is performed.

That is, in the first step S1, it is determined whether the temperature of the vehicle electrical component 23 is higher or lower than the first set temperature and the anti-icing logic of the outdoor heat exchanger 14 is performed or the cooling logic of the electric component 23 .

Of course, when the heat pump mode is operated, the anti-icing logic of the outdoor heat exchanger 14 and the cooling logic of the electrical component 23 may be simultaneously performed.

On the other hand, the first set temperature is a temperature required to cool the electrical component 23 as the temperature of the electrical component 23 rises, and the first set temperature can be widely varied according to the type and specification of the electrical component 23 .

If the temperature of the vehicle electrical component 23 is lower than the first set temperature as a result of the first step S1, a second step S2 is performed to determine whether the outside temperature is higher than the second set temperature do.

The second set temperature is preferably 10 deg. C, and the anti-icing logic when the outside air temperature is higher than 10 deg. C and the anti-icing logic when the outdoor temperature is lower than 10 deg. C are almost the same as shown in Fig. , The flap door 40 is controlled to be opened or closed depending on whether the outside air temperature is higher or lower than 10 ° C. This will be described later.

On the other hand, when the outside air temperature is lower than 10 ° C in the second step (S2), it is mainly winter since it includes a temperature of below zero.

If the outdoor air temperature is higher than the second set temperature as a result of the determination in the second step S2, the wind speed upstream of the outdoor heat exchanger 14 in the air flow direction is measured, and the decrease rate B of the wind speed (Step S3).

The third step S3 is a step of comparing the wind speed through the anemometer 50 provided on the upstream side of the outdoor heat exchanger 14 in the air flow direction with the vehicle speed of the actual vehicle, B) is larger or smaller than the set value.

That is, when the icemaking occurs in the outdoor heat exchanger 14, the wind speed at the site where the icing occurs is reduced. At the position where the front face of the outdoor heat exchanger 14 is divided into the upper, lower, left, Since the anemometer 50 is installed, the position where the wind speed decreases can be grasped and the site where the icing occurs can be known.

At this time, because the degree of occurrence of icing can be known according to the degree of decrease (B) of the wind speed to the vehicle speed, the anti-icing logic can be divided into a case where a lot of icing occurs and a case where icing occurs less frequently.

The set value is preferably 30%. For example, assuming that the vehicle speed and the wind speed are 100, when the wind speed is reduced to 70 due to icing in the outdoor heat exchanger 14, the reduction rate B is 30%.

As a result of the third step S3, if the rate of decrease B of the wind speed with respect to the vehicle speed is greater than the predetermined value, the cooling water supply passage W1 for supplying the cooling water to the refrigerant- The fourth step S4 is performed,

If the rate of decrease B of the wind speed with respect to the vehicle speed is smaller than the set value as a result of the third step S3, the opening amount of the cooling water supply flow path W1 is made smaller than the maximum opening amount, A fifth step S5 of gradually decreasing the opening amount of the cooling water supply passage W1 set according to the reduction rate B is performed.

In the fourth step S4, since a large amount of icing occurs in the outdoor heat exchanger 14, the flow control valve 31 of the cooling water supply passage W1 is opened to the maximum extent (100%), The cooling water circulating in the cooling water circulation line W of the cooling device 20 is supplied to the refrigerant-cooling water heat exchanger 30 through the cooling water supply flow path W1 to be circulated through the refrigerant circulation line R2 The temperature of the refrigerant flowing into the outdoor heat exchanger 14 is increased according to the heat exchange, thereby preventing the icing occurring in the outdoor heat exchanger 14 from being thawed and icing.

In addition, in the above process, since the cooling water is cooled by the heat exchange between the cooling water and the cold refrigerant passing through the expansion valve 13, the cooling performance of the electric component 23 is also improved.

At this time, when the temperature of the electrical component 23 is equal to or higher than the set value, the cooling effect of the electrical component 23 can be improved by opening the cooling water supply passage W1 for a predetermined time.

If the reduction rate B is greater than 20% and less than 30%, the fifth step S5 may be a case where less ice is generated in the outdoor heat exchanger 14 than the fourth step S4. The cooling water supply passage W1 is opened by 80% and the cooling water supply passage W1 is opened by 50% if the reduction rate B is larger than 10% and smaller than 20%, and the reduction rate B is smaller than 10% The cooling water supply passage W1 is blocked.

That is, the opening amount of the cooling water supply flow path W1 is also reduced according to the decrease rate of the reduction rate B, thereby preventing the icing occurring in the outdoor heat exchanger 14 from being thawed and icing.

Subsequently, during the operation in the fourth step (S4), the time period (T) during which the rate of decrease (B) of the wind speed with respect to the vehicle speed is greater than the set value (30%) is greater than 2 minutes or greater than 1 minute (S6) of judging whether it is less than 2 minutes or less than 1 minute.

If it is determined in the sixth step S6 that the time T for maintaining the state where the rate of decrease of the wind speed with respect to the vehicle speed B is larger than the set value is greater than 2 minutes, the air flow direction of the outdoor heat exchanger 14 A seventh step (S7) of opening the flap door (40) provided on the upstream side by 100% is performed,

When the time T during which the reduction rate B of the wind speed with respect to the vehicle speed is kept larger than the set value is greater than 1 minute and less than 2 minutes, the flap door provided on the upstream side in the air flow direction of the outdoor heat exchanger (S8) of opening 50% of the flap door 40,

When the time T for maintaining the state where the rate of decrease of the wind speed with respect to the vehicle speed B is larger than the set value is less than 1 minute, the cooling water supply passage W1 (Step S9).

That is, if the decreasing rate B of the wind speed with respect to the vehicle speed continuously exceeds the set value in the process of operating in the fourth step S4, the icing occurring in the outdoor heat exchanger 14 is still maintained, The outdoor air is supplied to the outdoor heat exchanger 14 by opening the flap door 40 by 100% or by 50% as in the step 8 (S8) .

At this time, when the outside air temperature is higher than 10 ° C, since the outside air is supplied to the radiator 22 due to the opening of the flap door 40, the cooling effect of the electrical component 23 can be improved.

In the seventh step (S7) and the eighth step (S8), the anemometer (50) is installed at four positions on the front face of the outdoor heat exchanger (14) So that only the flap door 40 at the position corresponding to the portion where icing occurs can be selected and opened.

As described above, since only the flap door 40 at the portion where the icing occurs is opened, the fuel consumption can be improved.

On the other hand, in the ninth step S9, only the cooling water supply passage W1 is opened at the maximum, and the cooling water supply passage W1 is maintained until the decrease rate B of the wind speed with respect to the vehicle speed is less than 10%.

If the outdoor air temperature is lower than the second set temperature (10 ° C) as a result of the second step (S2), it is determined whether the rate of decrease (B) of the wind speed with respect to the vehicle speed is greater than a predetermined value S10), < / RTI >

As a result of the determination in the tenth step S10, if the rate of decrease B of the wind speed with respect to the vehicle speed is greater than the set value, the cooling water supply passage W1 for supplying the cooling water to the refrigerant-coolant heat exchanger 30 is opened Step S11 is performed,

If the decrease rate B of the wind speed with respect to the vehicle speed is less than the set value as a result of the determination in the tenth step S10, the opening amount of the cooling water supply flow path W1 is made smaller than the maximum opening amount, (S12) in which the opening amount of the cooling water supply passage W1, which is set according to the reduction rate B, gradually decreases.

If the reduction rate B is greater than 20% and less than 30%, the cooling water supply passage W1 is opened by 80%, and the reduction rate B is greater than 10% and 20 %, The cooling water supply passage W1 is opened by 50%, and when the reduction rate B is less than 10%, the cooling water supply passage W1 is blocked.

The outdoor air temperature is lower than 10 ° C from the 10th step to the 16th step (S16), and is anti-azimuthal logic performed mainly in winter because it includes a temperature of minus lower. In the eleventh step (S11) And step S12 are performed in the same manner as in the fourth step S4 and the fifth step S5 described above, and therefore, detailed description thereof will be omitted.

Subsequently, during the operation in the eleventh step (S11), the time period (T) during which the rate of decrease (B) of the wind speed with respect to the vehicle speed is greater than the set value (30%) is greater than 2 minutes or greater than 1 minute (S13) of judging whether it is less than 2 minutes or less than 1 minute.

If it is determined in the thirteenth step S13 that the time T for which the rate of decrease of the wind speed with respect to the vehicle speed B is greater than the set value is greater than 2 minutes, the air flow direction of the outdoor heat exchanger 14 (S14) of closing the flap door (40) installed on the upstream side by 100% is performed,

When the time T during which the reduction rate B of the wind speed with respect to the vehicle speed is kept larger than the set value is greater than 1 minute and less than 2 minutes, the flap door provided on the upstream side in the air flow direction of the outdoor heat exchanger (S15) of closing 50% of the flap door 40,

When the time T for maintaining the state where the rate of decrease of the wind speed with respect to the vehicle speed B is larger than the set value is less than 1 minute, the cooling water supply passage W1 (Step S16).

That is, if the reduction rate B of the wind speed with respect to the vehicle speed continuously exceeds the set value (30%) in the process of operating in the eleventh step S11, if the icing occurring in the outdoor heat exchanger 14 is still maintained The flap door 40 is closed by 100% or the outdoor air is closed by 50% as in the fifteenth step S15, as in the fourteenth step S14, , Or only 50% of the supplied amount of ice can be thawed.

That is, since the outside air temperature is low in winter, it is preferable to cut off the supply of outside air to the outdoor heat exchanger 14 or supply only 50%.

In the fourteenth step (S14) and the fifteenth step (S15), the anemometer (50) is installed at four positions on the front face of the outdoor heat exchanger (14) It is possible to select and close only the flap door 40 at the position corresponding to the portion where icing occurs.

In the sixteenth step S16, only the cooling water supply passage W1 is opened at the maximum, and the cooling water supply passage W1 is maintained until the reduction rate B of the wind speed with respect to the vehicle speed is less than 10%.

Subsequently, if it is determined in the first step S1 that the temperature of the vehicle electrical component 23 is higher than the first set temperature, the seventeenth step S17 of operating the electrical component cooling apparatus 20 is performed,

(S18) of determining whether the temperature of the vehicle electrical component (23) is higher than a third set temperature during the seventeenth step (S17)

If the temperature of the vehicle electrical component 23 is higher than the third set temperature as a result of the determination in the step S18, the cooling water is supplied to the refrigerant-cooling water heat exchanger 30 while the electrical component cooling apparatus 20 is continuously operated The seventeenth step S19 of performing the maximum opening (100%) of the cooling water supply flow path W1 is performed.

The seventeenth step S17 is a step of activating the electric component cooling apparatus 20 by activating the water pump 21 when the temperature of the vehicle electrical component 23 rises above the first set temperature and is required to be cooled .

The 18th step S18 is a case where the temperature of the electrical component 23 continuously increases and rises above the third set temperature even though the electrical component cooling apparatus 20 is operating in the 17th step S17, Cooling water circulating line W of the electric component cooling apparatus 20 to the refrigerant-cooling water heat exchanger 30 through the cooling water supply flow path W1 to circulate the refrigerant circulating line R2 And the temperature of the cooling water is reduced by heat exchange with the refrigerant. As a result, the cooling performance of the electric component 23 is improved.

The third set temperature is set to a temperature higher than the first set temperature.

On the other hand, if the temperature of the vehicle electrical component 23 is lower than the third set temperature as a result of the checking in the step S18, the process returns to the seventeenth step S17.

10: Heating / cooling device 11: Compressor
12: indoor heat exchanger 13: expansion valve
14: outdoor heat exchanger 15: flow path switching valve
20: Electrical equipment cooling device 21: Water pump
22: Radiator 23: Electrical equipment
30: Refrigerant-cooling water heat exchanger 31: Flow control valve
40: flap door 50: anemometer

Claims (11)

The compressor 11, the indoor heat exchanger 12, the expansion valve 13, the outdoor heat exchanger 14 and the flow path switching valve 15 are connected to the refrigerant circulation lines R1 and R2, An electric component cooling apparatus 20 for cooling the vehicle electrical component 23 by connecting a water pump 21, a radiator 22 and a vehicle electrical component 23 on a cooling water circulation line W And a coolant-coolant heat exchanger (30) for exchanging heat between the coolant of the cooling / heating unit (10) and the cooling water of the electric component cooling apparatus (20), the method comprising:
In the heat pump mode,
A first step (S1) of determining whether the temperature of the vehicle electrical component (23) is lower than a first set temperature,
A second step S2 of determining whether the outdoor temperature is higher than the second set temperature when the temperature of the vehicle electrical component 23 is lower than the first set temperature as a result of the determination in the first step S1,
If the outdoor air temperature is higher than the second set temperature as a result of the determination in the second step S2, the wind speed upstream of the outdoor heat exchanger 14 in the air flow direction is measured, and the decrease rate B of the wind speed (S3) for judging whether or not the difference is larger than a predetermined value,
As a result of the third step S3, if the rate of decrease B of the wind speed with respect to the vehicle speed is greater than the predetermined value, the cooling water supply passage W1 for supplying the cooling water to the refrigerant- A fourth step S4,
If the rate of decrease B of the wind speed with respect to the vehicle speed is smaller than the set value as a result of the third step S3, the opening amount of the cooling water supply flow path W1 is made smaller than the maximum opening amount, (S5) in which the opening amount of the coolant supply passage (W1) set according to the decrease rate (B) gradually decreases when the temperature of the coolant supply passage (W1) decreases gradually. The method according to claim 1,
In the third step S3, the set value is 30%
If the reduction rate B is greater than 20% and less than 30%, the cooling water supply passage W1 is opened by 80%, and the reduction rate B is greater than 10% and less than 20% , The cooling water supply passage (W1) is opened by 50% if the cooling water supply passage (W1) is small, and the cooling water supply passage (W1) is blocked when the reduction ratio (B) is smaller than 10%. The method according to claim 1,
(T) during which the decrease rate B of the wind speed with respect to the vehicle speed is greater than the set value during the fourth step (S4) is greater than 2 minutes or greater than 1 minute and less than 2 minutes, or 1 (S6) of judging whether or not the temperature of the heat pump system is less than the predetermined temperature. The method of claim 3,
As a result of the sixth step S6,
A flap door provided on the upstream side in the air flow direction of the outdoor heat exchanger 14 when the time T for which the rate of decrease of the wind speed with respect to the vehicle speed B is greater than the set value is greater than 2 minutes A seventh step (S7) of opening 100%
When the time T during which the reduction rate B of the wind speed with respect to the vehicle speed is kept larger than the set value is greater than 1 minute and less than 2 minutes, the flap door provided on the upstream side in the air flow direction of the outdoor heat exchanger (S8) of opening 50% of the flap door 40,
When the time T for maintaining the state where the rate of decrease of the wind speed with respect to the vehicle speed B is larger than the set value is less than 1 minute, the cooling water supply passage W1 (S9) of maximizing the opening degree of the heat pump. 5. The method of claim 4,
The flap door (40) is installed at a position corresponding to a position where the flap door (40) is divided into four sections, that is, the upper, lower, left, and right sides of the outdoor heat exchanger (14)
An anemometer 50 is provided between the flap door 40 and the outdoor heat exchanger 14 at a position corresponding to the position of each of the flap doors 40,
The seventh step S7 and the eighth step S8 are characterized in that only the flap door 40 at a position corresponding to the portion where icing occurs in the outdoor heat exchanger 14 is selected and opened A control method for a vehicle heat pump system. The method according to claim 1,
(S10) for determining whether the rate of decrease (B) of the wind speed with respect to the vehicle speed is greater than a set value when the outside air temperature is lower than the second set temperature as a result of the determination in the second step (S2)
As a result of the determination in the tenth step S10, if the rate of decrease B of the wind speed with respect to the vehicle speed is greater than the set value, the cooling water supply passage W1 for supplying the cooling water to the refrigerant-coolant heat exchanger 30 is opened The eleventh step S11,
If the decrease rate B of the wind speed with respect to the vehicle speed is less than the set value as a result of the determination in the tenth step S10, the opening amount of the cooling water supply flow path W1 is made smaller than the maximum opening amount, And a twelfth step (S12) in which the opening amount of the cooling water supply passage (W1) set according to the reduction rate (B) gradually decreases. The method according to claim 6,
In the tenth step S10, the set value is 30%
If the decrease rate B is greater than 20% and less than 30%, the cooling water supply passage W1 is opened by 80%, and the reduction rate B is greater than 10% and less than 20% , The cooling water supply passage (W1) is opened by 50% if the cooling water supply passage (W1) is small, and the cooling water supply passage (W1) is blocked when the reduction ratio (B) is smaller than 10%. The method according to claim 6,
If the time (T) during which the rate of decrease (B) of wind speed with respect to the vehicle speed is greater than the set value during the operation in the eleventh step (S11) is greater than 2 minutes or greater than 1 minute and less than 2 minutes, or 1 (S13) of judging whether or not the temperature of the heat pump is less than the predetermined temperature. 9. The method of claim 8,
As a result of the determination in the thirteenth step S13,
A flap door provided on the upstream side in the air flow direction of the outdoor heat exchanger 14 when the time T for which the rate of decrease of the wind speed with respect to the vehicle speed B is greater than the set value is greater than 2 minutes (S14) of closing 100%
When the time T during which the reduction rate B of the wind speed with respect to the vehicle speed is kept larger than the set value is greater than 1 minute and less than 2 minutes, the flap door provided on the upstream side in the air flow direction of the outdoor heat exchanger A fifteenth step S15 of closing the flap door 40 by 50%
When the time T for maintaining the state where the rate of decrease of the wind speed with respect to the vehicle speed B is larger than the set value is less than 1 minute, the cooling water supply passage W1 (S16) of opening the maximum heat capacity of the heat pump system for the vehicle. 10. The method of claim 9,
The flap door (40) is installed at a position corresponding to a position where the flap door (40) is divided into four sections, that is, the upper, lower, left, and right sides of the outdoor heat exchanger (14)
An anemometer 50 is provided between the flap door 40 and the outdoor heat exchanger 14 at a position corresponding to the position of each of the flap doors 40,
The flush door 40 at the position corresponding to the portion where icing occurs in the outdoor heat exchanger 14 is selected and closed in the fourteenth step S14 and the fifteenth step S15 A control method for a vehicle heat pump system. The method according to claim 1,
If the temperature of the vehicle electrical component 23 is higher than the first set temperature as a result of the determination in the first step S1, the seventeenth step S17 of operating the electrical component cooling apparatus 20 is performed,
(S18) of determining whether the temperature of the vehicle electrical component (23) is higher than a third set temperature during the seventeenth step (S17)
If the temperature of the vehicle electrical component 23 is higher than the third set temperature as a result of the determination in the step S18, the cooling water is supplied to the refrigerant-cooling water heat exchanger 30 while the electrical component cooling apparatus 20 is continuously operated (S19) of opening the cooling water supply flow path (W1) to the maximum extent.

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