KR20130048489A - Air conditioner for vehicles - Google Patents

Abstract

PURPOSE: An air conditioner for a vehicle is provided to prevent hot air from being discharged to a user's face after releasing the cooling starting control. CONSTITUTION: An air conditioner for a vehicle comprises an air conditioner case(10), a blower(11), an evaporator(12), a cold air path, a hot air path, a heater core(13), a compressor(20), a temperature control door(14), a temperature control unit(47), an air flow control unit(48), and a control unit(50). The blower inhales air to the inside of the air conditioner case. The cold air path and the hot air path are formed to a lower part of the evaporator. The heater core is installed on the hot air path and heats the air. If the temperature of the air passed through the evaporator is greater than the standard temperature in a cooling mode, the control unit drives the blower in a constant speed for supplying the air flow corresponding to the number of stage which a passenger selects through the air flow control unit and drives the temperature control door to a position in a maximum heating mode closing the hot air path. [Reference numerals] (47) Temperature control unit; (48) Air flow control unit; (50) Control unit

Description

TECHNICAL FIELD [0001] The present invention relates to an air conditioner,

The present invention relates to a vehicle air conditioner, and to prevent hot air from being discharged to the occupant's face when the air conditioner is initially driven, thereby preventing the occupant from feeling uncomfortable. It relates to a vehicle air conditioner to be able to.

In general, a vehicle is equipped with an air conditioning system composed of a heater and an air conditioner, which is a heating and cooling device for maintaining a temperature at an appropriate level. The vehicle air conditioner is a device for increasing the comfort and comfort of the occupant in the vehicle and driving safety while the vehicle is in operation. Is given.

The vehicle air conditioning system may be classified into a full automatic temperature controller (FAT) type and a manual control type (manual type).

1 is a schematic diagram showing a vehicle FATC type air conditioning system of the prior art, and FIG. 2 is a front view showing an operation unit of the vehicle FATC type air conditioning system installed in an instrument panel of the prior art.

As shown, the FATC type air conditioning system for a vehicle includes an in-car temperature sensor 410 (Incar Sensor), a temperature sensor 420 (Ambient Sensor), an insolation sensor 430, and a humidity sensor 440 installed inside / outside the vehicle. The internal / external air alarm is input to the control unit 100 from the evaporator temperature sensor 450, the coolant temperature sensor 460, and the noxious gas detection sensor 470 to output a predetermined control signal to automatically perform the air conditioning function. .

In detail, the vehicle air conditioning system includes an air conditioning case in which a defrost vent 510, a face vent 520, and a foot vent 530 whose openings are adjusted by doors 510d, 520d, and 530d, respectively, are installed at the exits. 500 and an air inlet 610 and an air inlet 620 which are connected to an inlet 550 of the air conditioning case 500 and whose opening degree is adjusted by an intake door 630 are installed thereon, and a blower motor 650. A blower 600 for blowing the inside or outside air into the air-conditioning case 500 by the blowing fan 640 rotated by the air blower 640, and an evaporator 700 installed upstream of the internal flow path of the air-conditioning case 500. And, the heater core 710 is provided on the downstream side of the internal flow path of the air conditioning case 500 is controlled by the temporal opening 540 is installed in the front.

As shown in FIG. 2, the operation unit 200 installed in the instrument panel includes an air conditioner operation button 210, a wind direction selection 220, an outside temperature display button 230, an automatic button 240, and an automatic release button 250. Control button 260, windshield defrosting button 270, rear windshield heating button 280, temperature setting button 290, interior / exterior air selection button 300, harmful gas cut-off button 310 and display panel 320 is installed.

Next, FIG. 3 is a schematic diagram of a conventional manual controlled air conditioning system, and FIG. 4 is a view showing an example of a control panel mounted to an instrument panel for controlling a conventional manual controlled air conditioning system.

As shown in FIG. 3, the manual control air conditioning system is equipped with a swash plate type variable capacity compressor employing an EVC (Electronic Control Valve), and includes an air conditioning case 10 and an air conditioning case 10 forming an air flow path therein. A blower 11 installed at an inlet side of the blower 11 to blow external air into the air conditioning case 10, and installed on an air flow path inside the air conditioning case 10, and a refrigerant passing through the blower 11. The evaporator 12 which performs heat exchange between the air blown by the refrigerant and the refrigerant is installed in the air conditioning case 10, and the air blown by the blower 11 while passing through the high temperature engine E coolant. Heater core 13 through which heat exchange between cooling water is performed, and a degree of opening and closing of the warm air passage through which the air passing through the evaporator 12 passes and the air passing through the heater core 13 are controlled. Temperature The door 14, a plurality of vents (15a, 15b, 15c) for discharging the temperature controlled air into the vehicle, and a plurality of vent doors (16a, 15) for opening and closing the plurality of vents (15a, 15b, 15c) 16b, 16c). Here, the temperature control door 14 may be provided to adjust the degree of opening and closing of the cold air passage and the warm passage according to the rotation angle, as shown in the drawing, or may be provided in a slide (Slide) method.

In addition, the compressor 20 for sucking and discharging the refrigerant from the evaporator 12 is connected to the engine E through an electromagnetic clutch 21 to receive the power of the engine E intermittently and receive the compressor 20. ECV 23 is provided with the compressor 20 to control the inclination angle of the swash plate 22 provided in the inside) to adjust the refrigerant discharge capacity.

The air conditioner includes a condenser 24 for condensing and discharging the refrigerant supplied from the compressor 20, and an expansion valve 25 for condensing the refrigerant supplied from the condenser 24 to the evaporator 12. It is configured by. Here, the control unit 30 controls the inclination angle of the swash plate 22 by adjusting the duty value of the ECV 23, thereby adjusting the discharge capacity of the refrigerant.

In the manual control type air conditioner having the swash plate type variable capacity compressor having the above-described configuration, the inclination of the swash plate is changed by the ECV duty, and the refrigerant discharge amount of the compressor is determined by the inclination of the swash plate. As a result, the amount of refrigerant supplied to the evaporator varies according to the duty of the ECV, which means that the ECV duty value is a major factor determining the evaporator temperature. The ECV duty value is a value representing the time that the ECV is ON during the entire time as a percentage. Therefore, when the duty is high, the refrigerant discharge amount of the compressor per hour increases, and when the duty is low, it decreases.

4 is an exemplary view showing an example of a manual control air conditioner control panel. As shown in FIG. 4, the air conditioner control panel is provided for controlling a manual control type (manual) air conditioner.

An air volume adjusting unit 41a or 41b for driving the blower 11 to perform an air conditioning function, and a cooling function selecting unit 43 for receiving input from a driver whether the air conditioning apparatus is to be used as a cooling function; The air conditioner mode selection part 45a, 45b and the temperature control part 47a, 47b are comprised.

In the vehicle air conditioning system having the above-described configuration, the FATCC type air conditioning system having the configuration shown in FIGS. 1 and 2 includes automatic control factors such as mode, blower, intake, and A / C (air conditioner), and a target set by a user. In order to satisfy the temperature, the wind direction and the air volume are detected by detecting the interior and exterior temperatures. It automatically adjusts internal / external air and A / C ON / OFF.

In addition, the FATC type air conditioning system performs cooling start control under a predetermined entry condition in order to prevent the occupant from being uncomfortable by discharging uncooled air to the occupant's face during initial air conditioner operation, and cooling under a certain release condition. The start control is released.

At this time, the entrance condition of the cooling start control means that the blower 600 is automatically set to an A / C ON state when the air conditioner is initially driven, the outside air temperature is 30 ° C. or higher. If all of these conditions are met, manual control is performed for the manual operation of the mode switch, and the cooling start control is performed otherwise. After the key is turned on, the cooling start control is entered and the cooling start control is released when the cooling start control is released. There is no entry or re-entry of the furnace.

When all the entry conditions for the cooling start control are satisfied in the FATC type air conditioning system which performs the above-described structure, the cooling start control is performed in preference to the maximum cooling function and the starting air volume control. When the cooling start control is performed, the air conditioner is automatically turned on, and the blower follows the blower start air volume control after the rotation speed is maintained in the auto low state for 12 seconds, and the mode is the flower mode for 12 seconds. After cooling to FLOOR MODE, cooling mode to return to AUTO MODE is performed.

However, in the case of FATC type air conditioning system, the cooling start control is released after 12 seconds after the cooling start control to maintain the floor mode and the speed low state of the blower when the outside air temperature is over 30 ℃. In some cases, the evaporator may not be sufficiently cooled. In this case, there is a problem that hot air is discharged toward the face of the occupant even after the cooling start control to give discomfort to the occupant. This problem is caused by the cooling start control of the FATC type air conditioning system of the prior art performed based on the control of the speed (wind speed) of the blower.

In addition, in the case of the manual controlled air conditioning system, the blower speed adjustment is performed using a resistor having a plurality of different resistance values which are energized according to the position of the temperature controller 47a. For this reason, the rotational speed is constantly fixed according to the contact point of the temperature control unit 47a and the resistance, thereby preventing the cooling start control.

Accordingly, the present invention is to solve the problems of the prior art described above, regardless of the outside temperature of the vehicle during the initial operation of the vehicle air conditioning by performing a continuous cooling start control to a temperature that does not cause discomfort to the occupant An object of the present invention is to provide a vehicle air conditioner that prevents hot wind from being discharged to a face part of a passenger.

Another object of the present invention is to provide an air conditioner for a vehicle that performs cooling start control to allow the passenger to quickly generate and discharge cold air at a temperature at which the passenger feels comfortable.

Vehicle air conditioner of the present invention for achieving the above object, the air conditioning case 10 is formed with an air flow path therein; and a blower (11) for sucking air into the air conditioning case 10; and, An evaporator 12 provided inside the air conditioning case 10 to perform heat exchange between the air and the refrigerant; and a cold air passage and a warm passage formed downstream of the evaporator 12; and installed on the warm passage. Heater core 13 for heating the; and a compressor 20 for compressing the refrigerant passing through the evaporator 12 and discharged to the condenser 24; And, installed between the cold air passage and the warm air passage according to the position A temperature control door 14 for selectively opening and closing the cold air passage and the warm air passage; and a temperature controller 47 for selecting a temperature setting step of the inside of the vehicle from the driver; Receiving air volume control unit 48; And, the temperature tank A vehicle air conditioner comprising a control unit 50 for adjusting the temperature or air volume of the air discharged into the vehicle in response to the temperature setting step or the airflow setting step selected through the unit 47 or the airflow control unit 48 To

When the air temperature passing through the evaporator is greater than or equal to the reference value when the cooling mode is in operation, the control unit 50 supplies the blower 11 at a constant speed to supply the air volume corresponding to the number of stages selected by the occupant through the air volume control unit 48. The temperature control door 14 is driven to the maximum heating mode position to close the warm passage.

The control unit 50 changes the discharge mode to a floor mode in which the air discharged from the air conditioning case is supplied to the floor of the vehicle interior when the air temperature passing through the evaporator is equal to or greater than a reference value during the cooling mode operation. It is done.

The compressor 20 is a variable capacity compressor in which the amount of refrigerant discharged is varied according to the duty ratio of the applied voltage.

The controller 50 may set the duty ratio of the voltage applied to the compressor to a maximum when the air temperature passing through the evaporator is greater than or equal to the reference value during the cooling mode operation.

At this time, when the air temperature passing through the evaporator is lower than the reference value during the cooling mode operation, the control unit 50 returns the temperature control door to correspond to the position of the temperature control unit 47 selected by the occupant, discharge mode It characterized in that the floor mode to return to the discharge mode selected by the occupant.

The controller 50 may further release the duty ratio of the voltage applied to the compressor from the maximum setting mode when the air temperature passing through the evaporator becomes lower than the reference value during the cooling mode operation.

In the above-described configuration of the present invention, in performing the cooling start control, the start and release of the cooling start control is performed by using the temperature value of the evaporator sensor. In this case, the temperature of the evaporator is not lowered within the set time, thereby providing an effect of preventing hot wind from being discharged to the user's face after the cooling start control is released.

In addition, the present invention provides an effect of implementing the cooling start control function even in a manual control type (manual) vehicle air conditioner, which has not been implemented in the prior art, by performing ECV duty control during cooling start control.

1 is a schematic diagram showing a vehicle FATC type air conditioning system of the prior art,
2 is a front view showing an operation unit of a vehicle FATC type air conditioning system installed in an instrument panel of the related art;
Figure 3 is a schematic diagram of a manual control air conditioning system of the prior art,
4 is a view showing an example of a control panel mounted to the instrument panel for the control of the manual control air conditioning system of the prior art,
5 is a functional block diagram showing a configuration of a vehicle air conditioner of the present invention;
6 is a flowchart illustrating a processing procedure of a control method for cooling start control of a vehicle air conditioner according to the present invention.

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

5 is a functional block diagram showing the configuration of the vehicle air conditioner of the present invention.

As shown in FIG. 5, the vehicle air conditioner includes: an air conditioning case 10 having an air flow path formed therein; a blower 11 that sucks air into the air conditioning case 10; and the air conditioning case 10. Evaporator 12 which is provided inside the heat exchange between the air and the refrigerant; And, a cold air passage and a warm passage formed downstream of the evaporator 12; And, a heater installed on the warm passage to heat the air And a compressor 20 for compressing the refrigerant passing through the evaporator 12 under the control of the controller 50, adjusting the ECV duty value, and then discharging the refrigerant to the condenser 24. A temperature control door 14 installed between a passage and a warm passage to selectively open and close the cold passage and the warm passage according to a position; and a plurality of vents 15a, 15b, and 15c for discharging the temperature-controlled air into the vehicle; ) And a plurality of vent doors 16a, 16b, 16 for opening and closing the plurality of vents 15a, 15b, 15c. c) and a temperature adjusting unit 47 for selecting a temperature setting step inside the vehicle from the driver; and a wind amount adjusting unit 48 for selecting a flow rate setting step inside the vehicle from the driver; and the temperature adjusting unit 47. Or a control unit 50 for controlling the temperature or air volume of the air discharged into the vehicle in response to the temperature setting step or the airflow setting step selected through the airflow control unit 48.

The compressor 20 is connected to the engine E through the electronic clutch 21 to receive the power of the engine E intermittently, and the inclination angle of the swash plate 22 provided in the compressor 20. An ECV 23 for controlling the refrigerant discharge capacity is provided together with the compressor 20.

The compressor 20 may be configured as a variable capacity compressor in which the discharge refrigerant amount is changed according to the duty ratio of the applied voltage.

The control unit 50 performs a function of changing the discharge mode to a floor mode in which the air discharged from the air conditioning case is supplied to the floor of the cabin when the air temperature passing through the evaporator is greater than or equal to the reference value during the cooling mode operation. It is configured to.

In addition, the controller 50 is configured to perform a function of setting the duty ratio of the voltage applied to the compressor to the maximum when the air temperature passing through the evaporator is greater than or equal to the reference value during the cooling mode operation.

In addition, when the air temperature passing through the evaporator is lower than the reference value during the cooling mode operation, the control unit 50 returns the temperature control door to correspond to the position of the temperature control unit 47 selected by the occupant, and discharges the discharge mode. And return to the discharge mode selected by the occupant in the floor mode.

In addition, the air conditioner includes a condenser 24 for condensing and discharging the refrigerant supplied from the compressor 20, and an expansion valve 25 for condensing the refrigerant supplied from the condenser 24 to the evaporator 12. It is configured to further include.

The air conditioner having the above-described configuration has a temperature control door so that when a passenger operates the control panel (see FIG. 2 or FIG. 4) to select cooling or heating, air discharge mode, and air volume, a flow path corresponding to cooling or heating is formed ( After controlling 14), the plurality of vent doors 16a, 16b, and 16c are controlled to discharge air in modes such as defrost, face, and floor modes to perform an air conditioning function for the interior of the vehicle.

In this case, when the air conditioning apparatus performs initial cooling, the controller 50 is a case where the temperature value detected by the evaporator sensor is equal to or greater than a reference set temperature (eg, 10 ° C.) selected from a value ranging from 10 ° C. to 25 ° C. Is in a keyed-on state, and the cooling start control is performed when the wind direction discharge mode is either one of the vent and the floor modes, and the air conditioner ON is satisfied. When the cooling start control is performed, the air conditioner controls the vent doors 16a, 16b, and 16c to perform only the air discharge in the puller mode, maximizes the discharge amount of the refrigerant by setting the ECV duty value to 100%, and the temperature. The adjusting door 14 moves to the maximum cooling position and then performs cooling.

When the cooling start control is performed and the detected temperature of the evaporator sensor is lower than the reference set temperature, the cooling start control is stopped and cooling is performed according to the cooling mode preset by the user or the cooling mode manually set by the user. Done.

6 is a flowchart illustrating a processing procedure of a control method for cooling start control of a vehicle air conditioner according to the present invention.

As shown in Figure 6, the processing of the control method for the cooling start control by the air conditioning apparatus of FIG. . That is, in the case of performing the initial cooling after boarding, the controller 50 determines whether the startup state is caused by the key-on (S10).

As a result of the determination of whether the key is on, if the key is not in the on state, the apparatus does not perform the cooling start control and waits. On the contrary, when the key on state determines that the key is on, it is determined whether the temperature control switch of the control panel (not shown) is the cooling position (S20).

As a result of determining whether the temperature control switch of the control panel (not shown) is the cooling position, when the temperature control switch is the cooling position, it is determined whether the air conditioner is on by moving to the next step (S30).

As a result of determining whether the air conditioner is in an on state, when the air conditioner is in an on state, it is determined whether the current mode is a vent mode or a puller mode (S40).

As a result of the determination of the air discharge mode, in the vent or puller mode, it is determined whether the temperature of the evaporator is equal to or higher than the reference set temperature (10 ° C. in FIG. 6) (S50).

If it is determined that the temperature of the evaporator is equal to or higher than the reference set temperature, it is determined that all the entry conditions of the cooling start control are satisfied and the cooling start control is performed (S60).

The cooling start control drives the corresponding logic for the cooling start control as shown in FIG. 6, whereby the temperature control door 14 moves to the maximum cooling position, and the air discharge mode is in the puller mode. The duty value is set to 100% to allow the evaporator to cool rapidly by making the refrigerant discharge amount latest. In this process, the process periodically returns to step S60 to determine whether the evaporator temperature is higher than or equal to the reference set temperature. If the determination result is higher than or equal to the reference set temperature, the cooling start control of step S60 is continued.

If the air conditioner is not in the key on state (S10) or the cooling position in the process of determining whether the temperature control door is the maximum inward position (S20), the air conditioner is turned on. If not, when the air discharge mode is not the vent or puller mode, and the evaporator temperature is not more than the reference set temperature, the cooling function is performed according to the selection mode by the occupant (S70).

Steps S10 to S50 of the above-described process of the present invention, the temperature switch (not shown) of the control panel (not shown) for key on, air conditioner on, temperature control is located on the cooling side (eg, 16-step temperature control) Position of 8 stages or less), the detection temperature of the evaporator sensor is more than the reference set temperature, the air discharge mode is one of the vent or floor mode, and the step of determining whether all the conditions of the switch of the air conditioner is satisfied The air conditioner will be judged as a condition of admission.

All of the above entry conditions are satisfied and cooling is performed according to the cooling start control to move the temperature control door 14 to the maximum cooling position, to adjust the opening and closing of the mode doors so that the air discharge is in the puller mode, and the ECV duty. The process of performing cooling with the maximum value (100%) becomes the cooling start control process of the present invention.

During the cooling start control process, the controller 50 periodically detects the temperature of the evaporator and compares it with the reference set temperature to release the cooling start control when the temperature is lower than the reference set temperature. It becomes the release condition of the said cooling start control that the temperature detection value of such an evaporator sensor becomes below a reference | standard set temperature. When such a release condition is satisfied, the air conditioner is controlled according to the manual selection state of the general occupant after the air cooling start control is released. This process becomes the air cooling start control release process of the present invention.

In addition, when any one of the above entry conditions is not satisfied, the air conditioner is controlled according to the manual selection state of the general occupant without performing the cooling start control (S80).

10: air conditioner case 11: blower, 12: evaporator 13: heater core, 14: temperature control door
15a, 15b, 15c: vent, 16a, 16b, 16c: vent door 20: compressor
21: clutch, 22: swash plate, 23: ECV 24: condenser, 25: expansion valve
E: engine

Claims (5)

An air flow case 10 having an air flow path formed therein; and a blower 11 that sucks air into the air conditioning case 10; and a heat exchange between the air and the refrigerant provided in the air conditioning case 10. An evaporator 12 for performing the same; and a cold air passage and a warm air passage formed downstream of the evaporator 12; and a heater core 13 installed on the warm air passage to heat air; and the evaporator 12 Compressor 20 for compressing the refrigerant passing through the to discharge to the condenser 24; And, installed between the cold passage and the warm passage, the temperature control door for selectively opening and closing the cold passage and the warm passage according to the position ( 14); and, a temperature adjusting unit 47 for selecting a temperature setting step inside the vehicle from the driver; and a wind amount adjusting unit 48 for selecting the air flow setting step inside the vehicle from the driver; and the temperature adjusting unit ( 47) or the temperature setting step selected through the airflow control unit 48 In the air conditioning apparatus for a vehicle configured to include a control unit 50 for adjusting the temperature or air volume of the air discharged into the vehicle corresponding to the air flow setting step,
When the air temperature passing through the evaporator is greater than or equal to the reference value when the cooling mode is in operation, the control unit 50 supplies the blower 11 at a constant speed to supply the air volume corresponding to the number of stages selected by the occupant through the air volume control unit 48. The air conditioner for a vehicle, characterized in that for driving the temperature control door (14) to the maximum heating mode position to close the warm passage. The method according to claim 1, The control unit 50,
When the air temperature passing through the evaporator in the cooling mode operation is more than the reference value, the vehicle air conditioner, characterized in that the discharge mode is changed to the floor (Floor) mode so that the air discharged from the air conditioning case is supplied to the floor of the vehicle interior. The method according to claim 1,
The compressor 20 is a variable capacity compressor in which the amount of refrigerant discharged is varied according to the duty ratio of the applied voltage.
The control unit 50, when the air temperature passing through the evaporator during the cooling mode operation is a reference value, the vehicle air conditioner, characterized in that for setting the maximum duty ratio of the voltage applied to the compressor. The method according to claim 2, The control unit 50,
When the air temperature passing through the evaporator is lowered below the reference value during the cooling mode operation, the temperature control door is returned to correspond to the position of the temperature control unit 47 selected by the passenger, and the discharge mode is selected by the passenger in the floor mode. Vehicle air conditioner, characterized in that to return to. The method of claim 3, wherein the control unit 50,
The air conditioner for a vehicle, characterized in that to release the duty ratio of the voltage applied to the compressor from the maximum setting mode when the air temperature passing through the evaporator is lowered below the reference value during the cooling mode operation.

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