KR20060035895A - Automotive air conditioning system and control method - Google Patents

Abstract

The present invention relates to an air conditioner for a vehicle and a control method thereof, and an object of the present invention is to control not only a temperature but also a humidity in a vehicle air conditioner to which a variable displacement swash plate compressor is applied.

A control method for an automotive air conditioner according to the present invention includes the steps of setting a target indoor temperature and a target indoor humidity of a vehicle by a user; Detecting and inputting a vehicle indoor temperature, a vehicle outdoor temperature, and an amount of insolation from a sensor installed at a predetermined position of the vehicle; Calculating a target discharge temperature of the vent based on the target indoor temperature, the vehicle indoor temperature, the vehicle outdoor temperature, and the amount of insolation; Calculating a first evaporator temperature according to the evaporator inlet air; Calculating a second evaporator temperature according to the target discharge temperature; Calculating a third evaporator temperature according to the target indoor humidity; Setting a minimum value of the first to third evaporator temperatures as a target evaporator temperature; Calculating an opening degree of the temperature control door; Controlling the discharge capacity of the compressor by the target evaporator temperature; Calculating an operating unit output value based on the opening degree of the temperature control door and the actual evaporator temperature; And outputting the calculated operation unit output value.

Air Conditioning, Air Conditioning, Air Conditioning Control, Compressor, Variable Capacity Type, Temperature, Humidity Control

Description

Air conditioner for automobile and its control method {AIR CONDITIONER FOR VEHICLE AND CONTROLLING METHOD THEREOF}

1 is a cross-sectional view showing an example of a variable displacement swash plate compressor.

2 is a system configuration diagram for performing a control method of the vehicle air conditioner according to the present invention.

4 is a flowchart illustrating a control method of the vehicle air conditioner according to the present invention.

5 is a graph showing an example of selecting a target evaporator temperature according to the evaporator inlet air temperature.

6 is a graph showing an example of selecting a target evaporator temperature according to the target discharge temperature.

7 is a graph showing an example of the opening degree control of the temperature control door according to the mixed air set temperature.

<Description of the symbols for the main parts of the drawings>

100: variable displacement swash plate compressor, 160: pressure control valve,

200: evaporator, 230: heater core (Heater Core),

240: temperature control door, 300: control unit.

320: In-vehicle temperature sensor, 322: In-vehicle temperature sensor,

324: solar radiation sensor, 332: temperature control switch,

334: humidity control switch.

The present invention relates to a vehicle air conditioner and a control method thereof, and more particularly, to a vehicle air conditioner to which a variable displacement swash plate compressor is applied, which can control not only a temperature but also a humidity, and a control method thereof. will be.

In the variable displacement swash plate compressor, the inclination angle of the swash plate can be adjusted by varying the pressure of the refrigerant by the pressure control valve according to the load. The stroke distance of the piston is changed by adjusting the inclination angle of the swash plate, so that the discharge capacity of the refrigerant can be adjusted. The pressure regulating valve can be divided into an internal control type and an external control type. The structure of such a variable displacement swash plate compressor is well disclosed in Japanese Patent Laid-Open No. 2001-107854.

In the automotive air conditioner having a variable displacement swash plate compressor as described above, the required discharge heat (temperature), evaporator inlet air temperature (blowing air temperature) and fogging prevention properties calculated according to the set target evaporator temperature In consideration of this, variable displacement swash plate compressors and other air conditioning components must be operated.

Japanese Laid-Open Patent Publication No. 2003-200730 discloses a technique in which the temperature control door is closed when the evaporator temperature is lower than or equal to the set temperature (for example, 12 ° C.), and the temperature control door is opened when the evaporator temperature is higher than or equal to the set temperature. In addition, Japanese Laid-Open Patent Publication No. 2003-237339 discloses a technique for changing the set evaporator temperature in accordance with the outside air temperature.

However, in the above-mentioned prior arts, since the air conditioner is controlled only for temperature, and conditions such as indoor humidity are not considered in the air conditioner control, it is not only possible to secure comfort according to the indoor humidity. There is also a problem that can not control the humidity according to the user's preference.

It is an object of the present invention to control not only temperature but also humidity in a vehicle air conditioner to which a variable displacement swash plate compressor is applied.

In order to achieve the above object, the control method of the vehicle air conditioner according to the present invention comprises the steps of the user setting the target room temperature and the target room humidity of the vehicle; Detecting and inputting a vehicle indoor temperature, a vehicle outdoor temperature, and an amount of insolation from a sensor installed at a predetermined position of the vehicle; Calculating a target discharge temperature of the vent based on the target indoor temperature, the vehicle indoor temperature, the vehicle outdoor temperature, and the amount of insolation; Calculating a first evaporator temperature according to the evaporator inlet air; Calculating a second evaporator temperature according to the target discharge temperature; Calculating a third evaporator temperature according to the target indoor humidity; Setting a minimum value of the first to third evaporator temperatures as a target evaporator temperature; Calculating an opening degree of the temperature control door; Controlling the discharge capacity of the compressor by the target evaporator temperature; Calculating an operating unit output value based on the opening degree of the temperature control door and the actual evaporator temperature; And outputting the calculated operation unit output value.

According to the present invention, after the step of calculating the target discharge temperature, the internal and external air mode is determined, in the case of the bet mode, the evaporator inlet air temperature is selected as the vehicle room temperature, and in the case of the outdoor mode, the evaporator inlet air temperature is the vehicle The step of selecting the outdoor temperature may be further included.

In addition, after the step of calculating the opening degree of the temperature control door, comparing the target evaporator temperature and the actual evaporator temperature, if the temperature difference is outside the allowable value, the step of correcting the opening degree of the temperature control door may be further included.

In addition, the vehicle air conditioner according to the present invention, the user sets the target indoor temperature and the target indoor humidity of the vehicle, and detects the vehicle indoor temperature, the vehicle outdoor temperature and the solar radiation amount from a sensor installed at a predetermined position of the vehicle, the target The target evaporator temperature is calculated by the room temperature and the target indoor humidity, and the discharge capacity of the compressor is controlled by the target evaporator temperature.

The target evaporator temperature is preferably a minimum value of a first evaporator temperature according to an evaporator inlet temperature, a second evaporator temperature according to the target room temperature, and a third evaporator temperature according to the target indoor humidity.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of terms in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

1 shows an example of a variable displacement swash plate compressor 100. The variable displacement swash plate compressor 100 includes: a cylinder block (110) having a plurality of cylinder bores (112) formed in a longitudinal direction along a concentric circle; A plurality of pistons (Piston, 114) inserted into each cylinder bore (112) of the cylinder block (110); A front housing 120 coupled to the front of the cylinder block 110 to form a crank chamber 122 therein; A rear housing 130 coupled to the rear of the cylinder block 110 to form a refrigerant suction chamber 132 and a refrigerant discharge chamber 134 therein; A drive shaft 140 supported over the front housing 120 and the cylinder block 110; A rotor (Rotor 142) rotating together with the drive shaft 140 in the crank chamber 122; A swash plate 144 which is installed to be movable around the drive shaft 140 and whose edge is coupled to each piston 114 so as to advance and retract the piston 114, and one side of which is hinged to the rotor 142; Interposed between the cylinder block 110 and the rear housing 130, the refrigerant is sucked into the cylinder bore 112 from the refrigerant suction chamber 132 and compressed into the refrigerant discharge chamber 134 from the cylinder bore 112. A valve unit 150 for discharging the refrigerant; In addition, an externally controlled pressure regulating valve 160 is installed in the rear housing 130 to adjust the inclination angle of the swash plate 144 with respect to the drive shaft 140.

According to the variable displacement swash plate compressor 100 as described above, by the rotation of the swash plate 144 a plurality of pistons 114 are sequentially moved forward and backward. At the time of retraction of the piston 114 from the cylinder bore 112 (that is, during the suction stroke), the suction side of the valve unit 150 is opened by the pressure drop inside the cylinder bore 112, and the cylinder bore 112 is opened. And the suction chamber communicate with each other, the refrigerant is sucked into the cylinder bore 112 from the suction chamber. When the piston 114 moves toward the cylinder bore 112 (that is, during the compression stroke), the refrigerant sucked into the cylinder bore 112 is compressed by an increase in the pressure inside the cylinder bore 112, thereby providing a valve unit. Since the discharge side of 150 is opened and the cylinder bore 112 and the refrigerant discharge chamber 134 communicate with each other, the compressed refrigerant is discharged from the cylinder bore 112 into the refrigerant discharge chamber 134. Then, the inclination angle of the swash plate 144 is changed by the pressure regulating valve 160 according to the load, so that the discharge capacity of the refrigerant is changed. That is, when the output (current value) to the pressure regulating valve 160 is maximum, the inclination of the swash plate 140 is changed so that the stroke distance of the piston 114 is increased, thereby increasing the discharge capacity of the refrigerant. In addition, when the output to the pressure control valve 160 is minimum, the inclination of the swash plate 140 is changed so that the stroke distance of the piston 114 is shortened, so that the discharge capacity of the refrigerant is reduced. The change in the discharge capacity of the refrigerant means increase or decrease of the amount of heat discharged to the vehicle interior.

2 shows a vehicle air conditioner to which the variable displacement swash plate compressor 100 as described above is applied.

As shown in FIG. 2, the air conditioning apparatus includes an air conditioning case 210 and a blower 220 installed at an inlet side of the air conditioning case 210 to blow inside or outside air into the air conditioning case 210. , An evaporator 200 and a heater core 230 which are sequentially installed on the upstream / downstream side of the air conditioning case 210 and a heater core 230 side flow path and a heater for the air that has passed through the evaporator 200. Temperature control door 240 for adjusting the opening degree of the flow path bypassing the core 230, and variable displacement swash plate type compressor 100 for sucking and discharging the refrigerant from the evaporator 200 (hereinafter referred to as "compressor" And a condenser 170 for condensing and discharging the refrigerant supplied from the compressor 100, a receiver dryer 180 for gas-liquid separating the refrigerant supplied from the condenser 170, and a receiver dryer ( 180 condenses the refrigerant supplied from the evaporator 200 Outlet expansion valve 190 is made.

Reference numerals 212, 214, and 216 denote vents for controlling the air volume for the vehicle interior, respectively, and reference numerals 212d, 214d, and 216d denote doors for adjusting the opening degrees of the vents 212, 214, and 216, respectively. Indicates.

In addition, the opening degree of the cold air passage and the warm air passage of the air conditioning case 210 is made by adjusting the drive output of the control unit 310 to the actuator 310. In addition, by adjusting the inclination angle of the swash plate 144, the pressure control valve 160 for controlling the discharge capacity of the compressor 100, and the switching door 222 of the blower 220 for switching the air suction mode to bet or outside The drive output of the actuator (not shown) is also controlled by the control unit 300.

That is, the control unit 300 is to control the output value for each operating unit of the air conditioner, the inclination angle of the swash plate 144 with respect to the drive shaft 140 is changed to increase or decrease the discharge capacity of the compressor 100, Control the output (current value) to the control valve 160, and the temperature control door 240 controls the output voltage to the actuator 310 to adjust the opening degree of the cold and hot air passage of the air conditioning case 210 To control the output voltage of the actuator for driving the switching door 222 so that the inside or outside air is sucked through the intake duct of the blower 220 by turning the switching door 222.

On the other hand, the control unit 300 is input to the detection value from the various sensors, for example, as shown in Figure 2, the vehicle indoor temperature by the in-vehicle temperature sensor 320, the vehicle outdoor by the vehicle temperature sensor 322 The temperature, the solar radiation amount by the solar radiation sensor 324, the evaporator temperature by the evaporator temperature sensor 326, etc. are input. In addition, the user inputs the target indoor temperature and the target indoor humidity by the humidity control switch 334 to the control unit 300 through the temperature control switch 332 installed in the mode switch assembly 330 in the vehicle interior. Room temperature and target room humidity may be set.

3 shows an example of a mode switch assembly 330 installed in an automobile interior. Air conditioner switch 331, temperature control switch 332, humidity control switch 334, wind direction selection switch 336, automatic temperature control switch 338, automatic temperature control stop switch 340, air volume control switch 342 The front windshield removal switch 344, the rear windshield heating switch 346, the internal / external air selection switch 348, the harmful gas cutoff switch 350, and the display panel 352 are provided.                     

Specifically, the air conditioner switch 331 functions to start or stop the air conditioning apparatus. The temperature control switch 332 sets the target vehicle indoor temperature, operates the temperature control door 240 to adjust the opening degree of the cold air passage and the warm air passage of the air conditioning case 210 to control the temperature of the indoor discharge air. Function to adjust. The humidity control switch 334 serves to set a target vehicle indoor humidity. The wind direction selection switch 336 selects various air discharge modes such as a defrost mode in which air is discharged toward the window, a floor mode in which air is discharged toward the car floor, and a vent mode in which air is discharged toward the upper half of the vehicle interior. The opening degree of each of the vents 212, 214, and 216 is adjusted to correspond to the selected air discharge mode. The thermostat switch 338 serves to automatically perform the air conditioning mode by the control unit 100. The automatic temperature control stop switch 340 serves to stop the automatic control of the air conditioning mode. The air volume control switch 342 serves to adjust the air volume by adjusting the rotational speed of the motor of the blower 220. The windshield defrost switch 344 operates the door 212d to open the defrost vent 212 to remove frost caught on the windshield by indoor discharge air. The rear window heating wire switch 346 functions to heat the heating wire installed on the rear window to remove frost on the rear window. The internal / external air selection switch 348 functions to operate the switching door to adjust the opening degree of the air inlet and the outside air intake of the blower 220 to blow air in the bet mode or the outside air mode. The harmful gas cut-off switch 350, when the external harmful air is detected by the harmful gas detection sensor not shown in the room, the air intake mode is made to operate the switching door to be made in the bet mode automatically do. The display panel 352 functions to display various air conditioning mode states.

The temperature control switch 332 and the humidity control switch 334 may be installed in a vehicle interior in the form of a push button, a rotary switch, or a jog switch. In addition, the humidity control switch 334 may be configured to linearly subdivide the humidity in the form of a push button or jog switch, as well as discrete, such as high humidity, medium humidity, low humidity for each region in the form of a rotary switch. (離 散 的) can be made to set the humidity.

Next, a control method of the vehicle air conditioner according to the present invention will be described.

As shown in FIG. 4, the vehicle is started and an air conditioner is operated (S100). The user sets the target indoor temperature and the target indoor humidity of the vehicle by the temperature control switch 332 and the humidity control switch 334 of the mode switch assembly 330 (S110). Therefore, the vehicle indoor temperature, the vehicle outdoor temperature, and the solar radiation amount are input to the control unit 300 from sensors installed at predetermined positions of the vehicle, that is, the vehicle temperature sensor 320, the vehicle temperature sensor 322, and the solar radiation sensor 324. (S120).

Next, the control unit 300 calculates the target discharge temperature of the air conditioner vents 212, 214, and 216 based on the information, that is, the target indoor temperature, the vehicle indoor temperature, the vehicle outdoor temperature, and the amount of insolation (S130). .

The control unit 300 also calculates the target evaporator temperature based on the target discharge temperature calculated as described above.                     

Specifically, the control unit 300 selects the first evaporator temperature based on the evaporator inlet air temperature (S170), selects the second evaporator temperature based on the target discharge temperature (S180), and the humidity control switch 334. A third evaporator temperature is selected based on the target indoor humidity set through S).

An example of selecting the first evaporator temperature according to the evaporator inlet air temperature is shown in FIG. 5. In consideration of the diminished temperature, the evaporator temperature capable of preventing icing is minimized, and the target evaporator temperature is the evaporator inlet air temperature. An example is calculated to increase proportionally with an increase of. In addition, an example of selecting the second evaporator temperature according to the target discharge temperature is shown in FIG. 6, which shows an example in which the second evaporator temperature is calculated to increase proportionally with the increase in the target discharge temperature. The selection of the target evaporator temperature according to the target room humidity can be variably selected, for example, via a proportional-integral method.

Next, of the three first to third evaporator temperatures selected as described above, the control unit 300 selects the lowest temperature as the final target evaporator temperature (S200).

When the target evaporator temperature is selected as described above, the control unit 300 calculates the opening degree of the temperature control door 240 (S210). After calculating the opening degree of the temperature control door 240, by comparing the target evaporator temperature and the actual evaporator temperature (S212), if the temperature difference is outside the allowable value, the calculation of the opening degree of the temperature control door 240 to be calculated It may be (S214). An example of calculating the opening degree of the temperature control door 240 is shown in the graph of FIG. 7, wherein the opening degree for the warm passage of the heater core 230 is completely opened from the completely closed side as the mixed air set temperature increases. An example is calculated to increase proportionally to the side.

Next, by controlling the pressure regulating valve 160 of the compressor 100 by the control unit 300 according to the target evaporator temperature, the discharge capacity of the compressor is controlled (S220), and the output value of the operating portion of the air conditioning apparatus is controlled. Computation (S230), the output value is output to the operating unit.

On the other hand, after calculating the target discharge temperature (S130), the control unit 300 determines whether the air intake mode is the outside mode or the bet mode (S140), in the case of the outside air mode, the evaporator inlet air temperature is determined by the vehicle. The outdoor temperature is selected (S150), and in the bet mode, the evaporator inlet air temperature may be selected as the vehicle indoor temperature (S160).

According to the control method of the automotive air conditioner according to the present invention configured as described above, each of the evaporator temperature according to the evaporator inlet air temperature, the target discharge temperature, and the target room humidity is selected, Finally, by selecting the lowest temperature as the target evaporator temperature, by controlling the pressure regulating valve 160 of the variable displacement swash plate compressor 100, not only the temperature but also the humidity of the vehicle interior can be comfortably controlled. Can improve the sex.

 Furthermore, by controlling the opening degree of the temperature control door 240 according to the set temperature for the mixed air through the cold air passage and the warm air passage, it is possible to further improve the comfort of the vehicle interior.

Claims (5)

Setting a target room temperature and a target room humidity of the vehicle by the user; Detecting and inputting a vehicle indoor temperature, a vehicle outdoor temperature, and an amount of insolation from a sensor installed at a predetermined position of the vehicle; Calculating a target discharge temperature of the vent based on the target indoor temperature, the vehicle indoor temperature, the vehicle outdoor temperature, and the amount of insolation; Calculating a first evaporator temperature according to the evaporator inlet air; Calculating a second evaporator temperature according to the target discharge temperature; Calculating a third evaporator temperature according to the target indoor humidity; Setting a minimum value of the first to third evaporator temperatures as a target evaporator temperature; Calculating an opening degree of the temperature control door; Controlling the discharge capacity of the compressor by the target evaporator temperature; Calculating an operating unit output value based on the opening degree of the temperature control door and the actual evaporator temperature; And, Outputting the calculated operation unit output value; control method of a vehicle air conditioner comprising a. The method of claim 1, After the step of calculating the target discharge temperature, the internal and external air mode is determined, in the case of the bet mode, the evaporator inlet air temperature is selected as the vehicle indoor temperature, and in the case of the outdoor mode, the evaporator inlet air temperature is selected as the vehicle outdoor temperature. Control method of a vehicle air conditioner, characterized in that it further comprises a step. The method according to claim 1 or 2, And after calculating the opening degree of the temperature control door, comparing the target evaporator temperature with the actual evaporator temperature, and correcting and calculating the opening degree of the temperature control door when the temperature difference is out of an allowable value. Control method of the automotive air conditioner. The user sets the target room temperature and target room humidity of the vehicle, Detects the vehicle's indoor temperature, the vehicle's outdoor temperature, and the amount of insolation from sensors installed at predetermined positions of the vehicle Calculate a target evaporator temperature by the target indoor temperature and target indoor humidity, And the discharge capacity of the compressor is controlled by the target evaporator temperature. The method of claim 4, wherein And the target evaporator temperature is a minimum value of a first evaporator temperature according to an evaporator inlet temperature, a second evaporator temperature according to the target room temperature, and a third evaporator temperature according to the target indoor humidity.

Images