KR101442597B1 - Controlling method for air conditioner of vehicle - Google Patents

Abstract

The present invention relates to a control method for a vehicle air conditioning system, in which a cooling water reference temperature which is differentiated according to a vehicle speed and an outside temperature is set in advance in a mapping table, and a cooling water reference temperature selected by a vehicle speed and an outside temperature, A correction value calculation process according to a cooling water temperature control process for controlling the opening amount of the temperature control door; A correction value calculation process 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; And a temperature control door control step (S30) for controlling the opening degree of the temperature control door based on the correction values calculated in the above-mentioned steps, thereby providing a method of compensating the discharge temperature according to the temperature rise of the outside temperature of the vehicle, The temperature can be adjusted according to the cooling water temperature and the compensation of the engine RPM and TPS according to the vehicle speed and the outside temperature, so that the temperature control door opening amount can be controlled and the constant discharge temperature can be maintained.

Cooling water temperature, cooling water reference temperature, vehicle speed, outside temperature, discharge temperature, temperature control door

Description

TECHNICAL FIELD [0001] The present invention relates to a control method for a vehicle air conditioner,

The present invention relates to a control method of a vehicle air conditioning system, and more particularly, to a control method of an air conditioning system for a vehicle, and more particularly, to a control method of an air conditioning system for a vehicle by detecting an actual cooling water temperature value or engine RPM / TPS information through an outside air temperature / vehicle speed, correcting a tamper door opening degree according to the information, And a control method for the vehicle air conditioner.

Generally, an automotive air conditioner includes a cooling device and a heating device, as shown in Fig. The cooling apparatus includes an evaporator 40, a compressor 42, a condenser 44, a receiver dryer 46, and an expansion valve 48. The heating apparatus includes a heater core (not shown) (Heater Core, 50).

When the automatic air conditioning mode is selected in the air conditioner, the control unit 10 calculates various kinds of indoor / outdoor information sensed and inputted from various sensors, and controls the inside / outside air switching door 32 of the blower 30, 74d and 76d of the ventilation motor 34, the temperature control door 52 and the air conditioning case 70 by controlling the output voltages of the doors 72d, 74d and 76d, The air conditioning mode for the outside air inflow, the air volume, the temperature and the wind direction is automatically controlled.

The control unit 10 is provided with an in-vehicle temperature sensor 12, a vehicle outside temperature sensor 14, a radiation amount sensor 16, a humidity sensor 18, an evaporator temperature sensor 20, a noxious gas detection sensor 22, Various kinds of analog signals detected by the cooling water temperature sensor 24 and the like are converted into digital signals by the A / D converter and inputted to the controller 40. Various kinds of doors such as the temperature control door 52 and actuators such as the blower motor 34, Is also input.

The control unit 10 feedback-controls the air volume control voltage, the inside / outside air position voltage, the temperature control position voltage, and the wind direction position voltage according to the input signals to control the blower motor 34, 74d and 76d of the door 32, the temperature control door 52 and the vents 72, 74 and 76 are properly controlled, 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 is arranged so that the air passing through the evaporator 40 flows through the mixing chamber of the air conditioning casing 70 and the opening of the heater core 50- And is discharged from the mixing chamber to the interior of the automobile through the defrost vent 72, the face vent 74 and the foot vent 76 in accordance with the opening of the temperature control door 52 on the heater core 50 side. The temperature of the discharged air is adjusted.

However, in this temperature control method, when the water temperature of the cooling water flowing into the heater core 50 becomes higher or lower than the reference temperature by a certain level or more due to the difference in the calorific value of the engine and the difference in the cooling apparatus, The temperature of the mixed air passing through the core 50 fluctuates and the discharge temperature through the vents fluctuates. As a result, the temperature of the automobile room can not be maintained comfortably, and the temperature is maintained at a certain level or lower or lower There is a problem causing complaints to passengers.

Taking this into consideration, as disclosed in Japanese Unexamined Patent Application, First Publication No. 2000-318425, when the temperature of the heater core detected by the temperature sensor becomes below the comfortable temperature limit, the air blowing amount is controlled by controlling the command value for driving the blower motor Technology has been proposed. However, in this prior art, since the air volume of the blower is simply controlled irrespective of the degree of opening of the temperature control door, the occupant can feel only the sensation temperature according to the blowing amount, .

Accordingly, Korean Patent Application No. 2004-0030885 discloses a method for controlling the temperature of the air conditioner by cooling water as a method for solving the above problems.

This is to adjust the discharge temperature of the conditioned air to the automobile interior by adjusting 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. The control unit compares the temperature of the temperature control door with the reference cooling water temperature, calculates the opening correction value of the temperature control door for the difference, and controls the driving voltage of the temperature control door according to the correction value, .

According to the conventional method of controlling the temperature of the air conditioner by the cooling water temperature, since the opening correction amount of the temperature control door is adjusted by reflecting the change of the cooling water temperature change, the automatic temperature control of the room temperature is continued. There is an effect that compensation is maintained.

However, according to the conventional technology, a cooling water reference temperature is defined as a cooling water reference temperature in a relatively stable state in which a definite definition of the cooling water reference temperature is not made and a sudden temperature change does not occur in the automobile after starting, Is used as the cooling water reference temperature. However, the actual cooling water temperature varies depending on the outside air temperature and the vehicle speed. Therefore, when the cooling water reference temperature is designated as the specific cooling water temperature, the compensation value is not appropriate in accordance with the outside temperature and the same discharge temperature can not be maintained.

The method of detecting the cooling water temperature and compensating the opening amount of the temperature control door by the difference between the cooling water reference temperature and the cooling water reference temperature is performed by compensating the opening amount of the temperature control door by using the difference between the cooling water reference temperature and the sensed cooling water temperature after the cooling water temperature has risen , The temperature control door is compensated after the discharge temperature rises first. Therefore, there is a problem that a certain discharge temperature is not maintained during the period in which the temperature control door is moved.

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

It is another object of the present invention to provide a system and method for detecting engine RPM / TPS information to compensate for an increase in temperature after a temperature rise when compensating opening amount of a temperature control door only by cooling water temperature, The present invention is to provide a control method for a vehicle air conditioner capable of maintaining a constant discharge temperature by performing linear compensation.

It is still another object of the present invention to provide a method for compensating for a temperature control door opening amount by calculating a compensation value according to a cooling water reference temperature and a sensing temperature difference using a cooling water reference temperature mapping table for the cooling water reference temperature by vehicle speed and outside air, And a method for compensating for the opening amount of the temperature control door by the RPM / TPS information by a multi-task.

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

Wherein the cooling water reference temperature mapping table comprises:

The speed range is divided into a plurality of vehicle speeds so that the vehicle speed can be divided into a plurality of speed levels, and the cooling water reference temperature for each vehicle speed is obtained through evaluation of the actual vehicle according to the outdoor temperature and set as a mapping table.

It is another object of the present invention to provide a method of compensating a discharge temperature by regulating the amount of opening of a temperature control door in an automobile air conditioner, comprising the steps of: inputting engine RPM or TPS information at a predetermined sampling cycle Receiving engine information; An engine information variation amount calculating step of detecting an engine information variation amount by a difference between current information of the engine information and current information; A correction value calculation step of calculating a temperature adjustment door opening amount correction value based on the engine information variation amount; And a temperature control door opening control step of controlling the temperature control door opening degree based on the temperature control door opening amount correction value calculated in the correction value calculation step.

It is still another object of the present invention to provide a method of compensating a discharge temperature in accordance with a rise in the temperature of a cooling water of an automobile, the method comprising: setting a cooling water reference temperature, which is differentiated by vehicle speed and outside temperature, Calculating a correction value according to a cooling water temperature difference that adjusts the opening amount of the temperature control door by the difference between the reference temperature and the sensed cooling water temperature; A correction value calculation process 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; And performing a temperature control door control process (S30) for controlling the opening degree of the temperature control door based on the correction value calculated in each of the above processes.

The engine information is characterized by detecting only one of the RPM or TPS information of the engine and correcting and controlling the temperature control door opening amount based on the variation amount.

Further, the engine information includes RPM and TPS information of the engine, respectively, and after calculating each variation, a correction value corresponding to the RPM variation amount and a correction value corresponding to the TPS variation amount are applied together to correct the temperature adjustment door opening amount And a control unit.

The present invention makes it possible to maintain a constant discharge temperature at the outside air temperature by compensating for the opening amount of the temperature control door according to the cooling water temperature by differentially applying the cooling water reference temperature according to the outside temperature and the vehicle speed, And the TPS opening amount is received, and it is possible to maintain the predetermined discharge temperature by performing the line compensation before the engine cooling water temperature rises.

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

2 is a configuration diagram of an automotive air conditioner according to the present invention.

In this air conditioner, various indoor / outdoor information is input from the various sensors 12, 14, 16, 18, 20, 22, 24 in and out of the vehicle to the control unit 100, The air conditioning mode of the air conditioner 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 conditioning case 70 provided with a defrost vent 72, a face vent 74, and a foot vent 76, the opening of which is controlled by the doors 72d, 74d, and 76d, respectively. A ventilation inlet and an outside air inlet are provided at the upper portion of the air conditioner case 70 and the opening thereof is adjusted by the switching door 32. The air or outside air is blown by the ventilation fan into the inside of the air conditioner case 70 An air blower 34 for blowing air into the air blower 34; An evaporator (40) installed on an upstream side of an internal flow path of the air conditioning case (70); The heater core 50 is installed downstream of the internal flow path of the air conditioning case 70 and has an opening controlled by a temperature control door 52 installed at the front side.

The evaporator 40 is connected to the compressor 42 by a duct and the compressor 42 is connected to the condenser 44. The condenser 44 is connected to the receiver dryer 46. The receiver dryer 46 is connected to the evaporator 40, And an expansion valve (48) connected to the expansion valve (40), thereby constituting a cooling cycle. Further, the heater core 50 is connected to the engine 60 to constitute a heating cycle.

Therefore, during the cooling mode, the indoor air or the outside air blown by the blower 34 is exchanged with the refrigerant flowing in the evaporator 40 through the evaporator 40, The cooling of the vehicle interior is performed. The blowing air is discharged into the automobile room through open vents while exchanging heat with the cooling water flowing through the inside of the heater core 50 through the evaporator 40 and the heater core 50. Thus, .

The control unit 100 has an output for driving the doors 72d, 74d and 76d of the inside / outside air switching door 32, the blower 34, the temperature control door 52 and the vents 72, 74 and 76 The compressor 42 is intermittently driven and controlled by intermittently controlling the electromagnetic clutch of the compressor 42 while controlling the air conditioning mode pattern for the inflow of the inside / outside air, the air volume, the temperature and the wind direction by controlling the voltage do.

The present invention further includes an engine information detection unit 200 that receives vehicle speed information, engine RPM, and throttle position sensor (TPS) information from an engine management system (EMS) In the unit 100, the cooling water reference temperature is set for each of the outside temperature and the vehicle speed as a mapping table, and the opening amount of the temperature control door is compensated based on the difference between the cooling water reference temperature set according to the outside temperature and the vehicle speed and the cooling water temperature And a control program for a discharge temperature compensation method according to a rise in the temperature of the outside temperature of the automobile, which detects the engine RPM / TPS information and compensates the opening amount of the temperature control door based on the variation amount.

In consideration of the fact that the cooling water temperature varies according to the vehicle traveling environment and the outside temperature, the present invention determines the difference between the sensing temperature sensed by the cooling water temperature sensor 24 and the cooling water reference temperature, The cooling water reference temperature varies depending on the vehicle speed and the outside air temperature. Therefore, in consideration of this, it is necessary to evaluate the cooling water temperature in a stable condition of cooling water for a plurality of vehicle speeds (for example, idle, 40, 80, 120, 160 KPH) The cooling water reference temperature for each outdoor temperature is calculated by using an equation or a mapping table.

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

Considering that the temperature at which the coolant temperature is stabilized is high when the vehicle speed is high and the temperature at which the coolant temperature is stabilized is low when the vehicle speed is low, the cooling water reference temperature is detected based on the actual vehicle evaluation, . For example, when the vehicle speed is 160 KPH, when the outside air temperature is -40 ° C., the cooling water reference temperature is 72 ° C., the vehicle speed is 80 KPH, the outside air temperature is -40 ° C., , When the outside temperature is -40 ° C, the cooling water reference temperature is set at 65 ° C. Likewise, when the change in the outside air temperature at each vehicle speed is changed to -40 ° C, -20 ° C, 20 ° C, 40 ° C, or 60 ° C, the cooling water reference temperature is measured to set the cooling water reference temperature. FIG. 4 is a graph showing the relationship between the outside air temperature and the cooling water reference temperature in a specific vehicle speed, wherein the outside air temperature and the cooling water temperature are related to each other when the vehicle speed is 80 km / h, and the cooling water temperature rises as the outside air temperature increases.

Accordingly, 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 supply a higher temperature air by compensating the temperature control door by a predetermined amount.

5 is a control flowchart showing a control method of a vehicle air conditioning system according to the present invention.

As shown in the figure, the present invention mainly comprises: a correction value calculation step (S10) according to a cooling water temperature for adjusting the amount of opening of the temperature control door by the difference between the cooling water reference temperature and the sensed cooling water temperature; A step S20 of calculating a correction value according to engine information for adjusting the amount of opening of the temperature control door based on the variation amount of the RPM and TPS information of the engine and the opening degree of the temperature control door based on the correction value calculated in each step And a temperature control door control process (S30). The two correction value calculation steps (S10) and (S20) are performed in a multi-task manner to control the opening amount of the temperature control door.

The correction value calculation step (S10) according to the cooling water temperature difference,

As shown in FIG. 3, the vehicle speed and the outside air temperature detection step S11 for detecting the vehicle speed and the outside air temperature by preliminarily setting the cooling water reference temperature to the mapping table for the vehicle speed and the outside air temperature, A cooling water temperature selection step (S12) for setting a cooling water reference temperature by setting a cooling water reference temperature in the table, a cooling water temperature sensing step (S13) for sensing a temperature of the engine cooling water through a cooling water temperature detection sensor, And a correction value calculation step (S14) of calculating a temperature adjustment door opening correction value according to a difference between the temperature and the sensed cooling water temperature.

The vehicle speed and outside air temperature detection step S11 is a step in which the control unit 10 detects the outside air temperature from the outside air temperature sensor 14 and receives the vehicle speed information from the engine information detection unit 200, The corresponding cooling water reference temperature is selected in the mapping table of FIG. Of course, it is also possible to calculate the cooling water reference temperature according to the vehicle speed and the outside temperature as shown in Fig. 4 without using the mapping table.

Thus, the cooling water reference temperature is variably selected according to the vehicle speed and the outside temperature, and the cooling water temperature is sensed through the cooling water temperature sensor 24. [ It is preferable that the engine coolant temperature usually measures the coolant temperature at the rear end of the heater core.

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

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

Here, TD _{n +1} is a new temperature control door opening amount, TD is a current temperature control door opening amount, K is a correction constant, T _Ref Is the cooling water reference temperature, T _act The cooling water detection temperature

As shown in the above equation (1), the correction value of the temperature control door opening amount according to the difference between the cooling water reference temperature and the sensed cooling water temperature is calculated and the temperature control door opening degree is calculated based on the new temperature control door opening amount (Step S30).

Accordingly, the opening amount of the temperature control door is controlled according to the cooling water reference temperature and the sensed cooling water temperature. In the present invention, by selecting the cooling water reference temperature differently according to the vehicle speed and the outside air temperature, The door can be calibrated and the discharge temperature can be kept constant.

In the present invention, the amount of opening of the temperature control door is adjusted based on the amount of variation of the RPM and TPS information of the engine in addition to the correction of the temperature control door opening amount according to the cooling water temperature.

The correction value calculation step S20 according to the engine information includes:

An engine information detection step S21 for receiving engine RPM and TPS information provided by the EMS through the engine information detection unit 200 at a predetermined sampling period (e.g., 2 seconds) An engine information fluctuation amount calculating step (S22) for detecting an engine information fluctuation amount by a difference and a correction value calculating step (S23) for calculating a temperature adjusting door opening amount correction value based on the engine information variation amount.

When the engine RPM rises, the coolant temperature rises and the discharge temperature rises. Therefore, the control is performed in the direction of decreasing the temperature control opening amount. When the engine RPM is lowered, the cooling water temperature falls. Thereby maintaining the temperature.

The TPS increase causes the engine RPM rise because the driver depresses the accelerator pedal. Since the engine RPM information and the TPS information are interdependent, both of the information may be applied together, and the temperature control door opening amount .

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

TD _{n +1} is a new temperature control door opening amount, TD is a current temperature control door opening amount, and C 1 and C 2 are constants

The temperature control door opening amount correction value is calculated based on the engine information as in the above equation (2), and the process of controlling the temperature control door opening degree is performed (S30).

When the temperature control door is calibrated using the difference of the cooling water temperature to the cooling water reference temperature after the cooling water temperature has risen, the temperature control door is corrected after the discharge temperature first rises. During the movement of the temperature control door, . Accordingly, in the present invention, the engine RPM and the TPS information are received from the EMS before the influence of the cooling water temperature change, and the temperature control door is moved before the cooling water temperature changes to maintain the predetermined discharge temperature.

When the cooling water temperature starts to change, the temperature control door is moved by using the difference between the cooling water reference temperature and the sensed cooling water temperature, which are selected according to the vehicle speed and the outside temperature, to maintain the constant discharge temperature.

Therefore, according to the present invention, the line compensation is performed before the engine cooling water temperature is raised based on the engine RPM and the TPS information received from the EMS, and at the time when the cooling water temperature changes, the cooling water temperature reference temperature, By controlling the temperature control door according to the difference between the sensed cooling water temperature and the detected cooling water temperature, a constant discharge temperature can be maintained.

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

2 is a configuration diagram of an automotive air conditioning apparatus according to the present invention.

3 is a diagram illustrating an example of a cooling water temperature reference temperature mapping table according to vehicle speed and outdoor temperature according to the present invention.

FIG. 4 is a graph of the cooling water reference temperature according to the vehicle speed and the outside air temperature according to the present invention. FIG.

5 is a flowchart of a control method of a vehicle air conditioning system according to the present invention.

Description of the Related Art

12: in-vehicle temperature sensor 14: outside temperature sensor

16: Insolation sensor 18: Humidity sensor

20: evaporator temperature sensor 22: noxious gas detection sensor

24: Coolant 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)

A method of controlling an air conditioner for a vehicle, A vehicle speed and an outside air temperature detecting step (S11) for detecting a vehicle speed and an outside air temperature; A coolant temperature selection step (S12) for selecting a coolant reference temperature in a mapping table in which a coolant reference temperature is preset for each vehicle speed and outside temperature according to the detected vehicle speed and outside temperature; A cooling water temperature sensing step (S13) of sensing the temperature of engine cooling water through a cooling water temperature sensing sensor; A correction value calculation step (S14) of calculating a temperature control door opening amount correction value according to a difference between the predetermined cooling water reference temperature and the sensed cooling water temperature; And a temperature control door opening control step of controlling the temperature control door opening degree based on the temperature control door opening amount correction value calculated in the correction value calculation step (S14). The method according to claim 1, wherein the cooling water reference temperature mapping table comprises: Wherein the vehicle speed is divided into a plurality of vehicle speeds so that the vehicle speed can be divided into a plurality of speed levels, and a cooling-water reference temperature for each vehicle speed is obtained through evaluation of an actual vehicle, A method of controlling an air conditioner. The method according to claim 1, wherein the correction value calculation step (S14) TD _{n +1} = TD - K (T _Ref - T _act ) Equation (1) Here, TD _{n +1} is a new temperature control door opening amount, TD is a current temperature control door opening amount, K is a correction constant, T _Ref Is the cooling water reference temperature, T _act The cooling water detection temperature (1). ≪ / RTI > 2. The method according to claim 1, An engine information detection step (S21) of receiving engine RPM or TPS information at a predetermined sampling cycle, An engine information variation amount calculating step (S22) of detecting an engine information variation amount by a difference between the current information of the engine information and the current information; And a correction value calculation step (S23) of calculating a temperature adjustment door opening amount correction value based on the engine information variation amount, And the opening amounts of the temperature control doors are controlled by summing the respective correction values 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 in the temperature adjustment opening control step And a control unit for controlling the air conditioner. 5. The method according to claim 4, wherein the step (S23) TD _{n +1} = TD - engine RPM variation / C1 - TPS variation / C2 (2) TD _{n +1} is a new temperature control door opening amount, TD is a current temperature control door opening amount, and C 1 and C 2 are constants Is set to satisfy the above expression (2).

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