KR20100028681A - Controlling method for air conditioner of vehicle - Google Patents

Abstract

PURPOSE: A control method of an air conditioner for a vehicle is provided to uniformly maintain discharged air by controlling opening degree of a temperature control door. CONSTITUTION: A control method of an air conditioner for a vehicle is as follows. External temperature and vehicle speed are detected(S11). A cooling water reference temperature is determined from a mapping table based on the vehicle speed and the external temperature(S12). The temperature of cooling water is sensed by a cooling water sensor(S13). A correction value of opening degree of a temperature control door is calculated based on the determined cooling water temperature and the sensed cooling water temperature(S14). The openness of the temperature control door is controlled based on the correction value of the opening degree.

Description

CONTROLLING METHOD FOR AIR CONDITIONER OF VEHICLE}

The present invention relates to a control method of an air conditioner for a vehicle, and more particularly, the actual cooling water temperature mapping value or engine RPM / TPS information through outside air temperature / vehicle speed is detected, and the degree of discharge air temperature is corrected according to the corresponding information. It relates to a control method of the vehicle air conditioner to keep the constant.

In general, as shown in FIG. 1, an automotive air conditioner includes a cooling device and a heating device. The air conditioner includes an evaporator 40, a compressor 42, a condenser 44, a receiver drier 46 and an expansion valve 48, and the heater has a heater core for exchanging coolant from the engine 60. (Heater Core, 50).

When the automatic air conditioning mode is selected in the air conditioner, the control unit 10 calculates various indoor and outdoor information input by being sensed by various sensors and switches the internal / external air switching door 32 of the blower 30. The output voltage of the doors 72d, 74d, and 76d of the vents 72, 74, and 76 of the blower motor 34, the temperature control door 52, and the air conditioning case 70 is controlled. It automatically controls the air-conditioning mode for outside air inflow, air volume, temperature and wind direction.

The control unit 10 includes, for example, an in-vehicle temperature sensor 12, an out-of-vehicle temperature sensor 14, a solar radiation sensor 16, a humidity sensor 18, an evaporator temperature sensor 20, a noxious gas detection sensor 22. Various analog signals sensed by the cooling water temperature sensor 24 and the like are converted into digital signals by the A / D converter and input, while various doors such as the temperature control door 52 and actuators such as the blower motor 34 are provided. The driving voltage of is also input.

The control unit 10 controls feedback of the air volume control voltage, the internal / external air position voltage, the temperature control position voltage, and the wind direction position voltage according to the input signals, so that the blower motor 34 switches the internal / external air. By controlling the voltage output to their drive units so that the doors 72d, 74d, 76d of the door 32, the temperature regulating door 52 and the vents 72. 74, 76 operate properly, The air conditioning mode is automatically performed according to the external environment.

On the other hand, the temperature control door 52 provided in front of the heater core 50, the air flow through the evaporator 40 to the mixing chamber of the air conditioning case 70 and the opening degree of the flow path of the heater core 50 side It functions to control, and according to the opening degree of the heater core 50 side of the temperature control door 52, from the mixing chamber to the vehicle interior through the defrost vent 72, the face vent 74 and the foot vent 76 The temperature of the discharged air is controlled.

However, in such a temperature control method, when the water temperature of the coolant flowing into the heater core 50 becomes higher or lower than a predetermined level compared to the reference temperature due to the difference in heat generation of the engine and the difference in the cooling device, the evaporator 40 and the heater The temperature of the mixed air passing through the core 50 is fluctuated, and thus, the discharge temperature through the vents is fluctuated, so that the vehicle interior temperature is not maintained comfortably, and is periodically maintained at a low level or below a certain level. There is a problem that causes complaints to passengers.

In consideration of this point, as disclosed in Japanese Laid-Open Patent Publication No. 2000-318425, when the temperature of the heater core sensed by the temperature sensor falls below a comfortable system temperature, the blowing amount is controlled by controlling a command value for driving the blower motor. A technique has been proposed. However, in this prior art, since the air volume of the blower is simply controlled regardless of the opening degree of the temperature control door, the passenger can only feel the sensation temperature according to the air volume, and the actual temperature control according to the outside temperature of the vehicle is not achieved. There is this.

Therefore, as a method for improving the above problems, Korean Patent Application No. 2004-0030885 discloses a temperature control method of an air conditioner by cooling water temperature.

This is to adjust the opening degree of the temperature control door by correcting the difference of the measured cooling water temperature with respect to the reference cooling water temperature, so that the discharge temperature of the air conditioning air to the interior of the vehicle can be adjusted constantly. The cooling water of the heater core by the temperature sensor Opening of the temperature control door to the heater core side by controlling the driving voltage of the temperature control door according to the correction value by calculating the ON of the control unit by comparing the ON with the reference cooling water temperature and calculating the opening correction value of the temperature control door based on the difference. It is made to regulate.

According to the conventional method of controlling the temperature of the air conditioner by the cooling water temperature, the automatic adjustment of the room temperature is continued by adjusting the amount of correction of the opening of the temperature control door to reflect the change in the cooling water temperature. It is effective to compensate.

However, the related art defines a coolant reference temperature as a coolant reference temperature without a clear definition of the coolant reference temperature and does not cause a sudden temperature change after the vehicle is started. Figure 6) is used as the cooling water reference temperature. By the way, the actual cooling water temperature is a temperature difference that is stable depending on the outside air temperature and the vehicle speed occurs. Therefore, when the cooling water reference temperature is specified as a specific cooling water temperature, there is a disadvantage in that the compensation value is not appropriate according to the outside air temperature and thus the same discharge temperature cannot be maintained.

In addition, the method of compensating the opening amount of the temperature control door by detecting the cooling water temperature and the difference between the cooling water reference temperature and using the difference between the cooling water reference temperature and the sensing cooling water temperature after the cooling water temperature rises compensates for the opening amount of the temperature control door. In this case, the discharge temperature rises first, and then the temperature control door is compensated. Therefore, there is a problem in that a section in which a constant discharge temperature cannot be maintained is generated during the movement of the temperature control door.

An object of the present invention is to set the cooling water reference temperature for each of the outside air temperature and the vehicle speed as a mapping table, and to compensate for the opening amount of the temperature control door based on the difference between the coolant reference temperature set according to the outside air temperature and the vehicle speed and the detected cooling water temperature. An object of the present invention is to provide a control method of a vehicle air conditioner to maintain a constant discharge temperature at all outside temperatures.

Another object of the present invention is to detect the engine RPM / TPS information before the engine cooling water temperature rises in order to improve the problem of compensation after the temperature rise has already been made when compensating the opening amount of the temperature control door only by the cooling water temperature difference. An object of the present invention is to provide a control method of an air conditioner for a vehicle that performs line compensation to maintain a constant discharge temperature.

Still another object of the present invention is a method for compensating for an opening amount of a temperature control door by calculating a compensation value according to a difference between a coolant reference temperature and a sensed temperature by using the coolant reference temperature as a vehicle speed and an external coolant reference temperature mapping table, and the engine; It is to provide a control method of a vehicle air conditioner for performing a multi-task method of compensating the opening amount of the temperature control door by the RPM / TPS information.

As described above, an object of the present invention is to provide a control method for an air conditioner for a vehicle, comprising: a vehicle speed and outside temperature detection step of presetting a cooling water reference temperature for each vehicle speed and outside temperature in a mapping table, and detecting the vehicle speed and outside temperature; A cooling water temperature selecting step of setting a cooling water reference temperature by selecting a cooling water reference temperature from the mapping table according to the detected vehicle speed and outside air temperature; A coolant temperature detection step of sensing a temperature of the engine coolant through the coolant temperature detection sensor; A correction value calculating step of calculating a temperature adjustment door opening amount correction value according to a difference between the selected coolant reference temperature and the sensed coolant temperature; It is achieved by providing a control method for a vehicle air conditioner comprising a temperature control door opening degree control step of controlling the opening degree of the temperature control door on the basis of the temperature adjustment door opening amount correction value calculated in the correction value calculation step.

The cooling water reference temperature mapping table,

Each speed range is set to be divided into a plurality of vehicle speeds so as to distinguish the vehicle speeds into a plurality of speed stages, and the reference temperature of the coolant for each outdoor temperature is obtained by evaluating the actual vehicle and set as a mapping table.

In addition, another object of the present invention, in the method for compensating the discharge temperature by adjusting the opening amount of the temperature control door in the air conditioner of the vehicle, after the engine is started, input the engine RPM or TPS information at a predetermined sampling period Receiving engine information detection step; An engine information variation amount calculating step of detecting an engine information variation amount by a difference between the current information and the current information of the engine information; A correction value calculating step of calculating a temperature adjustment door opening amount correction value based on the variation amount of the engine information; It is achieved by providing a control method for a vehicle air conditioner, comprising a temperature control door opening degree control step of controlling the temperature control door opening degree based on the temperature adjustment door opening amount correction value calculated in the correction value calculation step.

In addition, another object of the present invention, in the discharge temperature compensation method according to the increase in the cooling water temperature of the vehicle, the cooling water reference temperature which is differentiated by the vehicle speed and the outside air temperature is set in advance in the mapping table, the cooling water selected by the vehicle speed and the outside air temperature A process of calculating a correction value according to the difference in the cooling water temperature for adjusting the opening degree of the temperature control door by the difference between the reference temperature and the sensed cooling water temperature; A process of calculating a correction value according to engine information for adjusting the opening amount of the temperature control door based on the variation amount of RPM and TPS information of the engine; It is achieved by providing a control method of a vehicle air conditioner configured to perform the temperature control door control process (S30) for adjusting the opening degree of the temperature control door based on the correction value calculated in each process.

The engine information is characterized in that it detects only one of RPM or TPS information of the engine and corrects and controls the opening degree of the temperature control door by the amount of change.

In addition, as the engine information, the RPM of the engine and the TPS information are respectively detected, and each variation is calculated, and then the correction value according to the RPM variation and the correction value according to the TPS variation are applied together to correct the temperature control door opening amount. It is characterized by controlling.

The present invention, by differentially applying the coolant reference temperature for each outdoor temperature, vehicle speed to compensate for the opening amount of the temperature control door according to the coolant temperature difference, it is possible to maintain a constant discharge temperature at all the outside air temperature, the engine RPM from EMS It is possible to maintain a constant discharge temperature by receiving a TPS opening amount and performing a phase opening before the engine cooling water temperature rises.

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

2 is a block diagram of a vehicle air conditioner according to the present invention.

The air conditioner is configured by inputting and processing various internal / external air information into the control unit 100 from various sensors 12, 14, 16, 18, 20, 22, and 24 inside / outside the vehicle. The air conditioning mode is automatically performed. The air conditioning mode is also performed by operating various buttons of the operation unit installed in the instrument panel of the vehicle interior.

The air conditioner includes: an air conditioner case 70 having a defrost vent 72, a face vent 74, and a foot vent 76 having openings controlled at doors by doors 72d, 74d, and 76d, respectively; It is connected to the inlet 30 of the air conditioning case 70 and the air inlet and the outside air inlet of the opening degree is adjusted by the conversion door 32 is installed on the top, and the inside or outside air conditioning case 70 by the blower fan A blower 34 for blowing into the air; An evaporator 40 installed upstream of the internal flow path of the air conditioning case 70; In addition, the heater core 50 having an opening degree is adjusted by a temperature control door 52 installed downstream of the internal flow path of the air conditioning case 70 and installed at the front side.

The evaporator 40 is connected to the compressor 42 in a pipeline, the compressor 42 is connected to the condenser 44, the condenser 44 is connected to the receiver dryer 46, the receiver dryer 46 is an evaporator The cooling cycle is configured by being connected to the expansion valve 48 is connected to (40). In addition, the heater core 50 is connected to the engine 60 is configured a heating cycle.

Therefore, in the cooling mode, the inside or outside air blown by the blower 34 is exchanged with the refrigerant flowing through the evaporator 40 while passing through the evaporator 40 to be changed into a cold, and the interior of the vehicle through the open vents By being discharged to, cooling of the vehicle interior is performed. The blower air is exchanged with the coolant flowing inside the heater core 50 while passing through the evaporator 40 and the heater core 50, and the air is discharged into the vehicle interior through the open vents, thereby heating the interior of the vehicle. Can be performed.

The control unit 100 outputs the internal / external air switching door 32, the blower 34, the temperature control door 52, and the doors 72d, 74d, and 76d of the vents 72, 74, and 76. By controlling the voltage, the air conditioner mode pattern for internal / external air inflow, air volume, temperature, and wind direction is controlled, and the drive of the compressor 42 is intermittently controlled by intermittently controlling the driving of the electromagnetic clutch of the compressor 42. do.

The present invention may further include an engine information detection unit 200 that receives vehicle speed information, engine RPM, and TPS (Throttole Position Sensor) information from an electronic control system (EMS) of an automobile. In the unit 100, the cooling water reference temperature is set as a mapping table for each of the outside air temperature and the vehicle speed, and the opening degree of the temperature control door is compensated based on the difference between the cooling water reference temperature set according to the outside air temperature and the vehicle speed and the detected cooling water temperature. And a control program for the discharge temperature compensation method according to the increase in the water temperature for each outside temperature of the vehicle to detect the engine RPM / TPS information and compensate for the opening amount of the temperature control door based on the change amount.

According to the present invention, considering the difference in the cooling water temperature according to the vehicle driving environment and the outside air temperature, the opening degree of the temperature control door is obtained by obtaining a difference between the sensing temperature detected by the cooling water temperature sensor 24 and the cooling water reference temperature. Compensation, but the reference temperature of the coolant will vary depending on the vehicle speed and the outside temperature, so considering the actual vehicle evaluation according to the actual vehicle evaluation for a plurality of vehicle speeds (e.g., children, 40, 80, 120, 160KPH) Change the temperature and apply the coolant reference temperature for each ambient temperature by using formula or mapping table.

Figure 3 shows an example of the coolant reference temperature map table according to the vehicle speed and the outside air temperature according to the present invention, Figure 4 is a graph illustrating the trend of the cooling water temperature fluctuation according to the vehicle speed and the outside air temperature according to the present invention.

The cooling water reference temperature is a high temperature at which the cooling water temperature is stabilized when the vehicle speed is high, and a temperature at which the cooling water temperature is stabilized when the vehicle speed is low is lowered. It is set to. For example, when the vehicle speed is 160KPH, when the outside temperature is -40 ℃, the coolant reference temperature is 72 ℃, when the vehicle speed is 80KPH, when the outside temperature is -40 ℃, the coolant reference temperature is 70 ℃, the vehicle speed is idle When the outside air temperature is -40 ℃, the reference temperature of the cooling water is set to 65 ℃. Similarly, when the change of the outside temperature at each vehicle speed is changed to -40 ° C, -20, 0 ° C, 20 ° C, 40 ° C, and 60 ° C, the cooling water reference temperature is set by measuring the respective cooling water reference temperatures. 4 is a graph of the relationship between the outside air temperature and the coolant reference temperature at a specific vehicle speed. As an example when the vehicle speed is 80 km / h, the outside air temperature and the cooling water temperature are related to each other, and the higher the outside air temperature, the higher the coolant temperature.

Therefore, in the present invention, when the coolant reference temperature is higher than the actually detected coolant temperature, the temperature control door opening amount correction value is calculated so as to compensate the temperature control door by a predetermined amount to supply a higher temperature air.

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

As shown in the drawing, the present invention includes a process of calculating a correction value largely according to a cooling water temperature difference for adjusting an opening amount of a temperature control door by a difference between a cooling water reference temperature and a sensed cooling water temperature; Compensation value calculation process according to the engine information for adjusting the opening amount of the temperature control door based on the change amount of the RPM, TPS information of the engine (S20), and to adjust the opening degree of the temperature control door based on the correction value calculated in each process It is made to perform the temperature control door control process (S30). The two correction value calculation processes (S10) and (S20) are performed in a multi-task manner to adjust the opening amount of the temperature control door.

Compensation value calculation process (S10) according to the cooling water temperature difference,

As shown in FIG. 3, the cooling water reference temperature is set in advance in the mapping table for each vehicle speed and outside air temperature, and the vehicle speed and outside temperature detection step (S11) for detecting the vehicle speed and outside air temperature is performed, and the mapping is performed according to the detected vehicle speed and outside air temperature. Cooling water temperature selection step (S12) for setting the coolant reference temperature by selecting the coolant reference temperature from the table, and a coolant temperature detection step (S13) for detecting the temperature of the engine coolant through the coolant temperature sensor, and the selected coolant reference A correction value calculation step S14 of calculating a temperature adjustment door opening amount correction value according to a difference between a temperature and the sensed coolant temperature is performed.

In the vehicle speed and outside temperature detection step S11, the control unit 10 detects the outside temperature from the outside temperature sensor 14, receives vehicle speed information from the engine information detection unit 200, and according to the input vehicle speed and outside temperature. The corresponding cooling water reference temperature is selected from the mapping table of FIG. 3. Of course, the cooling water reference temperature according to the vehicle speed and the outside temperature may be calculated as shown in FIG. 4 without using the mapping table.

As such, the coolant reference temperature is variably selected according to the vehicle speed and the outside temperature, and the coolant temperature is sensed through the coolant temperature sensor 24. In general, the engine coolant temperature is preferably measured at the rear end of the heater core.

Thereafter, the temperature adjustment opening amount correction value is calculated according to the difference between the coolant reference temperature selected in the step S12 and the coolant temperature detected in the step S13.

TD _{n +1} = TD-K (T _Ref -T _act ) ........ Equation (1)

Where TD _{n +1} is the new temperature control door opening, TD is the current temperature door opening, K is the correction constant, and T _Ref Is the coolant reference temperature, T _act Is the coolant detection temperature

As shown in Equation (1), the temperature control door opening amount correction value is calculated according to the difference between the coolant reference temperature and the detected coolant temperature, and the temperature control door opening degree is calculated based on the new door opening amount (%) according to the calculation result. The control process (S30) is performed.

Therefore, the opening degree of the temperature control door is adjusted according to the coolant reference temperature and the detected coolant temperature difference, but in the present invention, by selecting the coolant reference temperature differently according to the vehicle speed and the outside air temperature, the temperature is controlled based on the change of the vehicle speed and the outside air temperature. The door can be calibrated to maintain a constant discharge temperature.

Meanwhile, in the present invention, the amount of opening of the temperature control door is adjusted based on the amount of change in the RPM and TPS information of the engine, along with the correction of the amount of opening of the temperature control door according to the cooling water temperature difference.

Compensation value calculation process (S20) according to the engine information,

An engine information detection step (S21) of receiving engine RPM and TPS information provided from the EMS through the engine information detection unit 200 at a predetermined sampling period (eg, 2 seconds), and the current and current information of the engine information. An engine information variation amount calculating step (S22) for detecting an engine information variation amount by a difference and a correction value calculation step (S23) for calculating a temperature adjustment door opening amount correction value based on the engine information variation amount are performed.

When the engine RPM rises, the cooling water temperature rises and the discharge temperature increases, so it is controlled in the direction of decreasing the temperature control opening amount. To maintain the temperature.

The increase in the TPS causes the engine RPM to increase because the driver presses the accelerator pedal. Since the engine RPM information and the TPS information are mutually dependent, both information may be applied together, and the amount of temperature control door opening may be adjusted using only one of the information. You may control.

TD _{n +1} = TD-Engine RPM variation / C1-TPS variation / C2 ......... (2)

Where TD _{n +1} is the new temperature control door opening, TD is the current temperature door opening, and C1 and C2 are constants.

As shown in Equation (2), a process of controlling the temperature control door opening degree is performed by calculating the temperature control door opening amount correction value based on the engine information (S30).

When the temperature control door is calibrated by using the difference of the cooling water temperature after the cooling water temperature rises, the temperature control door is calibrated after the discharge temperature rises first. A section that cannot be generated occurs. Accordingly, in the present invention, the engine RPM and TPS information is received from the EMS before affecting the coolant temperature fluctuation, and the temperature control door is moved to maintain a constant discharge temperature before the coolant temperature is changed.

Then, when the cooling water temperature starts to change, the temperature control door is moved by using the difference between the reference temperature of the cooling water and the detected cooling water temperature, which are differently selected according to the vehicle speed and the outside temperature, thereby maintaining a constant discharge temperature.

Therefore, the present invention, based on the engine RPM and TPS information received from the EMS to compensate the line before the engine coolant temperature rises, and when the coolant temperature changes by setting the coolant temperature reference temperature that is differentiated by the outside temperature, vehicle speed, By adjusting the temperature control door according to the difference from the sensed cooling water temperature, it is possible to maintain a constant discharge temperature.

1 is a block diagram of a general automotive air conditioner.

2 is a block diagram of a vehicle air conditioner according to the present invention.

Figure 3 is an exemplary view of the cooling water temperature reference temperature mapping table according to the vehicle speed, air temperature according to the present invention.

Figure 4 is a graph of the coolant reference temperature according to the vehicle speed and outside temperature according to the present invention.

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

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

12: In-vehicle temperature sensor 14: In-vehicle temperature sensor

16: solar radiation sensor 18: humidity sensor

20: evaporator temperature sensor 22: harmful gas detection sensor

24: cooling water temperature sensor 30: air conditioning case inlet

40: evaporator 50: heater core

52: temperature control door

100: control unit 200: engine information detection unit

Claims (5)

In the control method of the vehicle air conditioner, A vehicle speed and outside air temperature detecting step (S11) of detecting a vehicle speed and outside air temperature; A cooling water temperature selecting step (S12) of selecting a cooling water reference temperature from a mapping table in which the cooling water reference temperature is set in advance for each vehicle speed and outside air temperature according to the detected vehicle speed and outside air temperature; Cooling water temperature detection step (S13) for detecting the temperature of the engine cooling water through the cooling water temperature sensor; A correction value calculating step (S14) of calculating a temperature adjustment door opening amount correction value according to a difference between the selected coolant reference temperature and the sensed coolant temperature; And a temperature control door opening degree control step of controlling the temperature adjustment door opening degree on the basis of the temperature adjustment door opening amount correction value calculated in the correction value calculating step (S14). The method of claim 1, wherein the cooling water reference temperature mapping table, The vehicle is characterized by setting each speed range so that the vehicle speed can be divided into a plurality of speed stages, and dividing the vehicle speed into a plurality of vehicle speeds. Discharge temperature compensation method according to the rise of water temperature by the outside air temperature. The method of claim 1, wherein the correction value calculating step (S14), TD _{n +1} = TD-K (T _Ref -T _act ) ........ Equation (1) Where TD _{n +1} is the new temperature control door opening, TD is the current temperature door opening, K is the correction constant, and T _Ref Is the coolant reference temperature, T _act Is the coolant detection temperature Control method of a vehicle air conditioner, characterized in that set to satisfy the above formula (1). According to claim 1, The control method of the vehicle air conditioner, Engine information detection step (S21) for receiving the engine RPM or TPS information at a predetermined sampling period, An engine information change amount calculating step (S22) of detecting an engine information change amount by a difference between the current information and the current information of the engine information; Further comprising a correction value calculating step (S23) for calculating the temperature adjustment door opening amount correction value based on the change amount of the engine information, In the temperature control opening degree control step, controlling the opening amount of the temperature control door by summing each correction value calculated in the correction value calculation step S14 based on the cooling water temperature and the correction value calculation step S23 based on the engine information. Control method of a vehicle air conditioner, characterized in that. The method of claim 4, wherein the calculating of the correction value based on the engine information (S23) is performed. TD _{n +1} = TD-Engine RPM variation / C1-TPS variation / C2 ......... (2) Where TD _{n +1} is the new temperature control door opening, TD is the current temperature door opening, C1, C2 are constants Control method of a vehicle air conditioning apparatus, characterized in that set to satisfy the above formula (2).

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