KR101758720B1 - Air conditioner for vehicles - Google Patents

Abstract

The present invention relates to an air conditioner for a vehicle, which can prevent a passenger from feeling uncomfortable due to hot wind blowing to the face of an occupant during an initial operation of the air conditioner, , ≪ / RTI &
The vehicle air conditioner includes a blower 11, an evaporator 12, a heater core 13, a compressor 20, and a coolant passage and a warm passage in the air conditioner, A temperature control unit 47 and an air flow rate control unit 48 for selecting a temperature setting step and a warming up step inside the vehicle from the driver, respectively, for selectively opening and closing the cool air passage and the warm air passage, And a control unit 50 for controlling the temperature or air volume of the air discharged into the vehicle corresponding to the temperature setting step or the air volume setting step selected through the temperature adjusting unit 47 or the air volume adjusting unit 48 The air conditioner according to claim 1,
When the temperature of the air passing through the evaporator in the cooling mode operation is equal to or greater than the reference value, the controller 50 controls the blower 11 to rotate at a constant speed , And drives the temperature control door (14) to a maximum heating mode position for closing the warming passageway.

Description

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

[0001] The present invention relates to a vehicle air conditioner, and more particularly, it relates to an air conditioner for a vehicle, which can prevent hot air from being blown onto the face of an occupant during an initial operation of the air conditioner, And more particularly, to an air conditioner for a vehicle.

Generally, a vehicle is provided with an air conditioning system composed of a heater and an air conditioner, which are heating and cooling devices for maintaining the temperature at an appropriate level. Such a vehicle air conditioner is a device for enhancing the comfort and comfort of a passenger in a vehicle during a vehicle operation and for ensuring safe driving. It is a device for maintaining a comfortable feeling by keeping the temperature, humidity, .

Such a car air conditioning system can be classified into a FATC (Full Automatic Temperature Controller) type and a manual control type (manual type).

Fig. 1 is a schematic view showing a conventional FATC type air conditioning system for a vehicle, and Fig. 2 is a front view showing an operating portion of a FATC type air conditioning system for a vehicle installed on a conventional instrument panel.

As shown in the figure, the FATC type air conditioner system for a vehicle includes an in-vehicle temperature sensor 410, an ambient temperature sensor 420, a radiation sensor 430, a humidity sensor 440, The indoor / outdoor alarm is input from the evaporator temperature sensor 450, the cooling water temperature sensor 460 and the noxious gas detection sensor 470 to the control unit 100 to output a predetermined control signal to automatically perform the air conditioning function .

Specifically, the automotive air conditioner system includes an air conditioning case (not shown) having a deproved vent 510, a face vent 520, and a foot vent 530, which are respectively opened by doors 510d, 520d, An air inlet 610 and an outside air inlet 620 connected to the inlet 550 of the air conditioning case 500 and controlled by the intake door 630 are installed in the upper portion of the air conditioner case 500, A blower 600 for blowing air or outside air into the air conditioning case 500 by a blowing fan 640 rotated by the blower fan 640 rotated by the blower fan 640 and an evaporator 700 installed on the upstream side of the internal flow path of the air conditioning case 500, And a heater core 710 installed on the downstream side of the internal flow path of the air conditioning case 500 and having a blowing opening degree adjusted by a front panel door 540 installed on the front side.

2, the operation unit 200 installed in the instrument panel includes an air conditioner operation button 210, a wind direction selection 220, an outside air temperature display button 230, an automatic button 240, an automatic release button 250, An adjustment button 260, a windshield defogger button 270, a rear windshield heating button 280, a temperature setting button 290, an inside / outside air selection button 300, a noxious gas automotive end button 310, (320).

Next, FIG. 3 is a schematic view of a conventional manual control type air conditioning system, and FIG. 4 is a view showing an example of a control panel mounted on an instrument panel for controlling a manual control type air conditioning system of the related art.

3, the manual control type air conditioning system is equipped with a swash plate type variable displacement compressor employing an EVC (Electronic Control Valve), and includes an air conditioning case 10 for forming an air flow path therein, A blower 11 installed on the inlet side of the air conditioner case 10 for blowing outside air into the air conditioner case 10 and a blower 11 provided on the air flow path inside the air conditioner case 10, (11) installed in the air conditioning case (10), the air being blown by the blower (11) as the high temperature engine (E) cooling water passes, and an evaporator (13) for performing heat exchange between the cooling water and the cooling water, a cooling passage through which the air passing through the evaporator (12) passes, and an opening / closing degree of the warm passage for the air passing through the heater core Temperature And a plurality of vent doors (16a, 16b) for opening / closing the plurality of vents (15a, 15b, 15c) 16b, and 16c. Here, as shown in the figure, the temperature control door 14 may be provided to adjust the degree of opening / closing of the cold air passage and the warm air passage according to the rotation angle, or may be provided in a slide manner.

A compressor 20 sucking refrigerant from the evaporator 12 and discharging the refrigerant is connected to the engine E through an electromagnetic clutch 21 to intermittently receive the power of the engine E. The compressor 20 An ECV 23 for controlling the refrigerant discharge capacity is provided together with the compressor 20 by controlling the inclination angle of the swash plate 22 provided in the compressor 20.

The air conditioner includes a condenser 24 for condensing and discharging the refrigerant supplied from the compressor 20 and an expansion valve 25 for passing the refrigerant supplied from the condenser 24 to the evaporator 12 . Here, the control unit 30 adjusts the duty value of the ECV 23 to control the inclination angle of the swash plate 22 so that the discharge capacity of the refrigerant is adjusted.

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

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

(41a, 41b) for performing the air conditioning function by driving the blower (11), a cooling function selecting unit (43) for receiving from the driver whether the air conditioning apparatus is to be used as a cooling function, Air conditioning mode selection units 45a and 45b, and temperature control units 47a and 47b.

In the automotive air conditioning system having the above-described configuration, the FATCC type air conditioning system having the configurations shown in Figs. 1 and 2 is provided with automatic control factors such as mode, blower, intake, and A / C (air conditioner) To satisfy the temperature, it senses the temperature inside the car and the outside temperature of the car, so that the wind direction and the air volume. The inside / outside air and A / C ON / OFF are adjusted automatically.

In addition, the FATC type air conditioning system performs cooling start control under a predetermined entry condition in order to prevent uncomforted air from being discharged to the passenger's face during the initial air conditioner operation to prevent the passenger from feeling uncomfortable, The start control is canceled.

At this time, the entry condition of the cooling start control means that the blower 600 automatically sets the outdoor air temperature to 30 ° C or higher and the A / C ON state when the air conditioner is initially driven. When all of the entering conditions are satisfied, the mode switch is manually controlled at the time of manual operation. Otherwise, the cooling start control is performed. If the cooling start control is canceled after entering the cooling start control after the key is turned on, There is no entry or re-entry into the database.

In the FATC type air conditioning system that performs the above-described structure operation, when the entering conditions for the cooling fan control are satisfied, the cooling start control is performed in preference to the maximum cooling function and the startup air amount control. When the cooling start control is performed, the air conditioner is automatically turned on and the blower is kept in the AUTO LOW state for 12 seconds, followed by blower start air flow control, FLOOR MODE) and then returns to the AUTO MODE.

However, in the case of the FATC type air conditioning system, when the outside air temperature is 30 ° C or more, since the cooling start control is released after 12 seconds have elapsed after performing the cooling start control for maintaining the low speed state of the Furur mode and the blower, The evaporator may not be sufficiently cooled. In this case, hot air is discharged toward the face of the passenger even after the cooling and starting control, which may give the passenger an unpleasant feeling. This problem is caused by performing the cooling start control of the FATC type air conditioning system of the related art based on the control of the speed (wind speed) of the blower.

Further, in the case of the manual control type air conditioning system, the blower speed adjustment is performed by using resistors having a plurality of different resistance values which are energized according to the position of the temperature adjusting portion 47a. Therefore, the rotational speed is fixed constantly according to the contact point between the temperature regulating unit 47a and the resistor, so that the cooling start control can not be performed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a vehicle air conditioner which is capable of preventing a vehicle occupant from feeling uncomfortable, And it is an object of the present invention to provide a vehicle air conditioner which prevents hot wind from being discharged to the passenger's face.

Another object of the present invention is to provide a vehicle air conditioner that performs cooling start control to generate and discharge cool air at a temperature at which a passenger feels comfortable, as quickly as possible.

In order to achieve the above object, the present invention provides a vehicular air conditioning system comprising: an air conditioning case (10) having an air flow path formed therein; a blower (11) for sucking air into the air conditioning case (10) An evaporator (12) provided in the air conditioning case (10) for performing heat exchange between air and a refrigerant; a cold air passage and a warm air passage formed on the downstream side of the evaporator (12) A compressor 20 for compressing the refrigerant that has passed through the evaporator 12 and discharging the refrigerant to the condenser 24; and a heat exchanger 20 installed between the cold air passage and the warm air passage, A temperature regulating door (14) for selectively opening and closing the cool air passage and the warm passageway; a temperature regulating part (47) for selecting a temperature setting step inside the vehicle from the driver; and an air flow rate setting step (48) for adjusting the air volume And a control unit (50) for controlling the temperature or air volume of the air discharged into the vehicle in accordance with the temperature setting step or the air volume setting step, which is selected through the air supply unit (47) or the air volume adjusting unit (48) In this case,

When the temperature of the air passing through the evaporator in the cooling mode operation is equal to or greater than the reference value, the controller 50 controls the blower 11 to rotate at a constant speed , And drives the temperature control door (14) to a maximum heating mode position for closing the warming passageway.

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 when the temperature of the air passing through the evaporator is equal to or greater than the reference value .

The compressor (20) is a variable displacement compressor in which the discharge refrigerant amount is varied in accordance with a duty ratio of an applied voltage,

The control unit 50 sets the duty ratio of the voltage applied to the compressor to a maximum when the temperature of the air passing through the evaporator in the cooling mode operation is equal to or greater than the reference value.

In this case, when the temperature of the air passing through the evaporator is lowered below 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 passenger, To the discharge mode selected by the passenger in the floor mode.

The control unit 50 also releases the duty ratio of the voltage applied to the compressor from the maximum setting mode when the air temperature passing through the evaporator in the cooling mode operation is lowered below the reference value.

The present invention having the above-described structure performs the cooling start control by using the temperature value of the evaporator sensor in performing the cooling start control. Therefore, in the case of the conventional technology, The temperature of the evaporator is not lowered within the set time, thereby 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 a cooling start control function even in a manual control type (manual type) air conditioner that can not be implemented in the prior art by performing ECV duty control in cooling start control.

1 is a schematic view showing a conventional FATC type air conditioning system for a vehicle,
Fig. 2 is a front view showing an operating portion of a FATC type air conditioning system for a vehicle installed on an instrument panel of the related art, Fig.
3 is a schematic diagram of a prior art manual control type air conditioning system,
4 is a view showing an example of a control panel mounted on an instrument panel for controlling a manually-controlled 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 showing a process of a control method for cooling start control of the air conditioner of 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 a configuration of a vehicle air conditioner of the present invention.

5, the vehicular air conditioning system includes an air conditioning case 10 having an air flow path formed therein, a blower 11 for sucking air into the air conditioning case 10, (12) installed inside the evaporator (12) to perform heat exchange between air and refrigerant, a cold air passage and a warm air passage formed on the downstream side of the evaporator (12), a heater A compressor (20) for compressing the refrigerant passing through the evaporator (12) under the control of the controller (50) by adjusting the ECV duty value and discharging the refrigerant to the condenser (24) A temperature control door 14 installed between the passageway and the warm passageway for selectively opening and closing the cool passageway and the warm passageway according to the position and a plurality of vents 15a, 15b, 15c A plurality of vent doors 16a, 16b, 16c for opening and closing a plurality of vents 15a, 15b, a temperature adjusting unit 47 for selecting a temperature setting step in the vehicle from the driver, an air volume adjusting unit 48 for selecting an air volume setting step in the vehicle from the driver, And a control unit 50 for controlling the temperature or air volume of the air discharged into the vehicle in accordance with the temperature setting step or the air volume setting step selected through the air volume adjusting unit 48.

The compressor 20 is connected to the engine E through an electromagnetic clutch 21 to intermittently receive the power of the engine E. The inclination angle of the swash plate 22 provided in the compressor 20 The ECV 23 is provided together with the compressor 20 to control the refrigerant discharge capacity.

The compressor 20 may include a variable displacement compressor in which the amount of refrigerant discharged varies depending on a duty ratio of a voltage to be applied.

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 when the temperature of the air passing through the evaporator in the cooling mode is equal to or greater than a reference value .

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

When the temperature of the air passing through the evaporator is lowered below 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 passenger, And return to the discharge mode selected by the passenger in the floor mode.

The air conditioner further includes a condenser 24 for condensing and discharging the refrigerant supplied from the compressor 20 and an expansion valve 25 for passing the refrigerant supplied from the condenser 24 to the evaporator 12, .

When the passenger operates the control panel (see Fig. 2 or Fig. 4) to select the cooling or heating, the air discharge mode, and the air flow rate, the air conditioning apparatus of the above- 14, and controls the plurality of vent doors 16a, 16b, 16c to discharge air in a mode such as defrost, face, flood mode, etc. to perform an air conditioning function for the inside of the vehicle.

When the air conditioner performs initial cooling, the controller 50 determines that the temperature detected by the evaporator sensor is equal to or higher than a reference set temperature selected from a value in the range of 10 ° C to 25 ° C (for example, 10 ° C) And when the wind direction discharge mode satisfies all of the vent or flood mode and the air condition ON (ON), the cooling start control is performed. When the cooling start control is performed, the air conditioner controls the vent doors 16a, 16b, and 16c to perform only air discharge in the full-luer mode, maximizes the refrigerant discharge amount by setting the ECV duty value to 100% The control door 14 moves to the maximum cooling position and performs cooling.

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

6 is a flowchart showing a process of a control method for cooling start control of the air conditioner of the present invention.

As shown in Fig. 6, the process of the control method for the cooling start-up control by the air conditioner of Fig. 5 proceeds when the passenger of the vehicle starts the cooling control process for the cooling start control of the air conditioner of the present invention . That is, in the case where the initial cooling is carried out after boarding, the control unit 50 determines whether the engine is started by the key-on (S10).

If it is determined that the key is not in the key-on state as a result of the key-on determination, the controller waits without performing cooling-start control. Alternatively, if it is determined that the key is turned on, it is determined whether the temperature control switch of the control panel (not shown) is in the cooling state (S20).

If it is determined that the temperature control switch of the control panel (not shown) is located at the cooling position, the operation proceeds to the next step to determine whether the air conditioner is in the on state (S30).

If it is determined that the air conditioner is on, it is determined whether the current mode is the vent mode or the full mode (S40).

If it is determined that the ventilation mode is one of the full-luer modes, 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 entering conditions of the cooling start control are satisfied and the cooling start control is performed (S60).

6, the temperature control door 14 is moved to the maximum cooling position, the air discharging mode is set to the full luer mode, and the ECB The duty value is set to 100% so that the evaporator is rapidly cooled by minimizing the refrigerant discharge amount. In step S60, it is determined whether the evaporator temperature is equal to or higher than the reference set temperature. If the evaporator temperature is equal to or higher than the reference set temperature, the cooling operation is continuously performed in step S60.

If it is not the key-on state in each of the processes described above (S10) and if it is not located in the cooling position in the process of determining whether the temperature control door is the maximum inside position, the air conditioner is turned on If the air discharge mode is not the vent or the full-luer mode, and the evaporator temperature is not equal to or higher than the reference set temperature, the cooling function is performed according to the mode selected by the occupant (S70).

In steps S10 to S50 of the process of the present invention, a temperature switch (not shown) of a control panel (not shown) for key on, air condition on and temperature control is positioned on the cooling side Determining whether or not all the conditions of the evaporator sensor detection temperature being higher than the reference set temperature, the air discharge mode being one of the vent or flood mode, and the air conditioner being switched on are satisfied, This is the process of judging the cooling start control entry condition.

The cooling control is performed in accordance with the cooling start control so that the temperature control door 14 is moved to the maximum cooling position and the air discharge is adjusted to the full luer mode, (100%) to perform the cooling operation is 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, and releases the cooling start control if the temperature is lower than the reference set temperature. The temperature detection value of the evaporator sensor becomes lower than the reference set temperature is the cancel condition of the cooling start control. When the release condition is satisfied, the cooling start control is canceled and the air conditioner is controlled according to the manual selection state of a general occupant. This process is the cooling start control release process of the present invention.

If any one of the 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 conditioning 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)

A blower 11 for sucking air into the air conditioner case 10 and an air conditioning case 10 provided inside the air conditioner case 10 for performing heat exchange between air and refrigerant, A heater core (13) installed on the warming passage for heating the air, and an evaporator (12) for heating the evaporator (12) A compressor 20 for compressing the refrigerant passing through the refrigerant passage and discharging the refrigerant to the condenser 24; a temperature control door (not shown) provided between the refrigerant passage and the warm passage for selectively opening and closing the refrigerant passage and the warm passage A temperature adjusting unit 47 for selecting a temperature setting step of the inside of the vehicle from the driver, an air volume adjusting unit 48 for selecting the air volume setting step in the vehicle from the driver, 47) or the temperature setting step selected through the air volume adjusting unit 48 And a control unit (50) for adjusting the temperature or air volume of the air discharged into the vehicle in response to the air amount setting step, the air conditioner comprising:
When the temperature of the air passing through the evaporator in the cooling mode operation is equal to or greater than the reference value, the controller 50 controls the blower 11 to rotate at a constant speed , And drives the temperature control door (14) to a maximum cooling mode position for closing the warming passage,
The compressor (20) is a variable displacement compressor in which the discharge refrigerant amount is varied in accordance with a duty ratio of an applied voltage,
Wherein the control unit (50) sets the duty ratio of the voltage applied to the compressor to a maximum when the temperature of the air passing through the evaporator in the cooling mode operation is equal to or greater than a reference value. The apparatus of claim 1, wherein the controller (50)
Wherein the controller changes the discharge mode to a floor mode in which air discharged from the air conditioning case is supplied to the floor of the vehicle when the temperature of the air passing through the evaporator is equal to or greater than a reference value when the air conditioning mode is operated. delete 3. The apparatus of claim 2, wherein the controller (50)
When the temperature of the air passing through the evaporator is lowered below the reference value in 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 switched to the discharge mode To the air conditioner. The apparatus of claim 1, wherein the controller (50)
Wherein the duty ratio of the voltage applied to the compressor is released from the maximum setting mode when the temperature of the air passing through the evaporator becomes lower than the reference value in the cooling mode operation.

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