KR20120047084A - Air conditioner in vehicle and control method - Google Patents

Air conditioner in vehicle and control method Download PDF

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Publication number
KR20120047084A
KR20120047084A KR1020100108763A KR20100108763A KR20120047084A KR 20120047084 A KR20120047084 A KR 20120047084A KR 1020100108763 A KR1020100108763 A KR 1020100108763A KR 20100108763 A KR20100108763 A KR 20100108763A KR 20120047084 A KR20120047084 A KR 20120047084A
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South Korea
Prior art keywords
pwm
air
heater
heat transfer
temperature
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KR1020100108763A
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Korean (ko)
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KR101342939B1 (en
Inventor
김태은
유상준
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한라공조주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
    • B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2228—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2259—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal
    • B60H2001/2265—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant output of a control signal related to the quantity of heat produced by the heater

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  • Air-Conditioning For Vehicles (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

The present invention relates to a vehicle air conditioner, comprising: a blower for blowing air, an evaporator for cooling the air blown by the blower, and a PWM heat transfer device for heating the air passing through the evaporator, An operation unit which receives a set temperature from a user; When the set temperature is input through the operation unit, the target air volume and the target discharge temperature are calculated using the sensor and the input set temperature, and if the PWM electric heater needs to be operated, the PWM duty and the PWM electric heat are generated according to the difference between the current air volume and the target air volume. A controller configured to differentially calculate a PWM duty change rate for each air volume change rate so that the air temperature passing through the heater varies linearly and output a PWM control signal for controlling the PWM heat transfer heater; And a power supply unit for turning on / off the power supplied to the PWM electric heater in accordance with the PWM control signal output from the controller.
According to the present invention, there is an advantage in that the air temperature passing through the PWM heat heater is linearly changed to stably reach the discharge temperature by differentially applying the PWM duty fluctuation rate according to the air volume during the operation of the PWM heat heater. In this way, the air temperature discharged to the vehicle interior can be changed linearly to ensure a more comfortable vehicle interior environment.

Description

Air conditioner for vehicle and its control method {Air conditioner in vehicle and control method}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner, and more particularly, to a vehicle air conditioner and a control method thereof so that the air temperature passing through a PWM heat transfer heater can be linearly changed according to the air volume.

The vehicle air conditioner supplies cold air in order to lower the internal temperature in summer, and warm air in order to increase the internal temperature in winter.

1 is a conceptual diagram of a conventional vehicle air conditioner. In the case of heating, the hot coolant flowing through the heater core 30 exchanges heat with the air blown from the blower 20, and the air warmed by the heat exchange is passed through each vent 70. Flows into the vehicle. At this time, the temp door 50 is rotatably installed on the upstream air passage of the heater core 30 to control the temperature of the discharged air by allowing the air to pass through or bypass the heater core 30. In FIG. 1, reference numeral 10 denotes a motor for providing a driving force to the blower 20, 40 denotes an electrothermal heater that is an auxiliary heater, and 60 denotes an evaporator used for heating.

However, in the initial heating, since it takes a certain time until the coolant flows the heater core 30 after the engine is driven, heating is not performed immediately after the vehicle is started. Therefore, the engine must be idled for a predetermined time before driving for the initial heating, which is undesirable in terms of energy saving and environmental pollution.

In order to solve this problem, an auxiliary heater has been proposed. The auxiliary heater generates heat for a certain time before the cooling water is heated for the initial heating of the vehicle.

As the auxiliary heater, a PTC heater, that is, an electrothermal heater 40 shown in FIG. 2 is mainly used. The heat transfer element 41 used in the heat transfer heater 40 is a positive temperature coefficient thermistor (heat transfer element) having a constant resistance temperature coefficient, unlike a conventional heater using a heating coil, there is little risk of fire and lifespan. This can be used semi-permanently. In FIG. 2, reference numeral 42a denotes a heat sink, 42b a heat sink fin, 43 an insulating plate, 44 an end bar, and 45 a housing.

The heat transfer heater 40 may be installed at the rear of the heater core 30 so as to generate heat until the high temperature coolant flows in the heater core 30, thereby effectively initial heating the inside of the vehicle. However, since a predetermined time passes after the engine is driven, the heater core 30 is sufficiently heated to achieve smooth heating, and thus, the heat transfer heater 40 is preferably used only during initial driving of the vehicle for energy saving.

On the other hand, in order to control the heater core 30, the heat transfer heater 40 and the temper door 50, and the blower 20 for blowing air to them, the vehicle air conditioner, as shown in FIG. 90) and an electronic control unit 80 (ECU).

The heater controller 90 transmits the ON signal of the blower 20 to the electronic control unit 80, and the electronic control unit 80 receives the ON signal of the blower 20, so that the blower 20 is in a driving state. If it is determined, power is applied to the first heat transfer element 41a. At this time, the first heating element relay 84a is opened to supply power to the first heating element 41a.

3 shows three heat transfer elements 41a, 41b, 41c as the low voltage multi-stage heat transfer heater 40. When the first heating element relay 84a is opened and power is applied to the first heating element 41a and the first heating element 41a generates heat, the heater controller 90 receives the heat transfer ON signal and sequentially generates the first heating element 41a. The 2,3 heating element relays 84b and 84c are opened. When the second and third heating element relays 84b and 84c are opened, power is applied to the second and third heating element 41b and 41c, respectively, so that the second and third heating element 41b, 41c generates heat. That is, in the case of the low voltage multi-stage electrothermal heater 40, it has a heating structure of one stage, two stages, and three stages, and the heating bodies of each stage are sequentially operated by the operation of the corresponding relay.

Referring to Figure 4 describes a control method of a conventional vehicle air conditioner as follows.

First, when the vehicle air conditioner is turned on, a target discharge temperature is calculated by using various sensors such as outdoor temperature, internal temperature, and cooling water temperature in a heater controller and a temperature set by a user through an operation panel (S10). Then, the temp door moves to the position mapped to the target discharge temperature according to the instruction of the heater controller (S20).

Subsequently, when the cooling water temperature is low as in the initial start-up and additional heat source is required, the electrothermal heater is turned on (S30). That is, when the heater controller requests the electronic control unit to approve the operation of the heat transfer heater, and the electronic control unit approves the operation of the heat transfer heater, the heat transfer elements of the heat transfer heater are sequentially turned on. And, when the smooth heating is implemented, the heat transfer heater is turned off (S40).

On the other hand, as shown in Fig. 5, there is also a PWM (Pulse Width Modulation) signal control method to turn ON / OFF of the electric heater, not a relay method. That is, the heater controller 91 outputs a PWM signal through the communication line to control the PWM heat transfer heater 92. In FIG. 5, reference numeral 93 denotes a heating element.

Here, PWM is a type of pulse modulation, a method of modulating by changing the width of the pulse in accordance with the size of the modulation signal, the width of the pulse is wider when the amplitude of the control signal is large, the width of the pulse is narrow when the amplitude is small In addition, since the position or amplitude of the pulse does not change, the amount of current applied to the PWM heat heater can be adjusted. Thus, as well as relatively high energy efficiency can be obtained compared to the voltage control method, it is possible to change the temperature of the PWM heater by outputting a PWM control signal to the power supply for supplying power to the PWM heater.

By the way, in the case of a vehicle air conditioner to which a PWM heat transfer heater is applied, although it may operate linearly using a PWM signal, the air temperature passing through the PWM heat transfer heater does not change linearly. Therefore, if the same PWM duty fluctuation rate per hour is applied irrespective of the air volume, oscillation occurs because the time required for stabilizing the discharge temperature is too slow or fast at a specific air volume.

Accordingly, the present invention is to solve the above problems, the vehicle air conditioning apparatus to reach the discharge temperature stably by linearly changing the air temperature passing through the PWM heat heater in accordance with the amount of air during the operation of the PWM heat heater. And a control method thereof.

In order to achieve the above object, a vehicle air conditioner according to the present invention includes a blower for blowing air, an evaporator for cooling the air blown by the blower, a PWM heat transfer heater for heating the air passing through the evaporator; An air conditioner for a vehicle, comprising: an operation unit configured to receive a set temperature from a user; When the set temperature is input through the operation unit, the target air volume and the target discharge temperature are calculated using the sensor and the input set temperature, and if the PWM electric heater needs to be operated, the PWM duty and the PWM electric heat are generated according to the difference between the current air volume and the target air volume. A controller configured to differentially calculate a PWM duty change rate for each air volume change rate so that the air temperature passing through the heater varies linearly and output a PWM control signal for controlling the PWM heat transfer heater; And a power supply unit for turning on / off the power supplied to the PWM electric heater in accordance with the PWM control signal output from the controller.

Here, when the target air volume is relatively small, it is preferable to calculate the PWM duty fluctuation rate relatively small.

In addition, when the target air volume is relatively large, the controller preferably calculates the PWM duty variation rate relatively large.

On the other hand, in order to achieve the above object, the control method of the vehicle air conditioner according to the present invention, a blower for blowing air, an evaporator for cooling the air blown by the blower, PWM for heating the air passing through the evaporator A control method for a vehicle air conditioner including an electrothermal heater, comprising: calculating a target air flow rate and a target discharge temperature by using a sensor and an input set temperature when a user inputs a set temperature; When the PWM heat transfer heater is required and the PWM heat transfer heater is approved, the PWM duty change rate according to the air flow rate can be linearly changed so that the PWM duty and the air temperature passing through the PWM heat transfer heater according to the difference between the current air flow rate and the target air flow change linearly. Differentially calculating and outputting a PWM control signal for controlling the PWM electric heater; And turning on / off power supplied to the PWM electric heater in accordance with the output PWM control signal.

Here, when the target air volume is relatively small, it is preferable to calculate the PWM duty fluctuation rate relatively small.

In addition, when the target air volume is relatively large, it is preferable to calculate the PWM duty fluctuation rate relatively large.

According to the present invention, there is an advantage in that the air temperature passing through the PWM heat transfer heater is linearly changed to stably reach the discharge temperature by differentially applying the PWM duty change rate according to the air flow rate according to the air volume during the operation of the PWM heat transfer heater. . In this way, the air temperature discharged to the vehicle interior can be changed linearly to ensure a more comfortable vehicle interior environment.

1 is a conceptual diagram of a conventional vehicle air conditioner.
Figure 2 is an exploded perspective view of the heat transfer heater of Figure 1;
3 is a control circuit diagram of the electrothermal heater of FIG.
Figure 4 is a flow chart for explaining a control method of a conventional vehicle air conditioner.
5 is a control circuit diagram of a PWM electrothermal heater.
6 is a conceptual diagram of a vehicle air conditioner according to the present invention.
7 is a graph of discharge temperature and duty relationship.
8 is a flowchart illustrating a control method of the vehicle air conditioner according to the present invention.

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

6 is a conceptual diagram of a vehicle air conditioner according to the present invention.

As shown in the figure, the vehicle air conditioner according to the present invention, the blower 120 for blowing air by the driving force of the motor 110, and the evaporator 150 for cooling the air blown by the blower 120 and , The PWM heat transfer heater (130) for heating the air passing through the evaporator (150), the air passing through the evaporator (150) is installed on the upstream air passage of the PWM heat transfer heater (130) PWM heat transfer heater (130) ) Through the temporal door 140 to adjust the temperature of the discharged air to pass through or bypass, and each vent 160 for inflow of the discharged air into the vehicle.

In addition, the vehicle air conditioner according to the present invention, so that the air temperature passing through the PWM heat transfer heater 130 is linearly changed according to the air volume during the operation of the PWM heat transfer heater 130 so that the discharge temperature can be stably reached. The control unit 170, the control unit 180 and the power supply unit 190 is further provided.

The operation unit 170 is a kind of operation panel to receive a set temperature for setting the temperature of the vehicle air conditioner to a predetermined temperature from the user.

When the user inputs the set temperature through the operation unit 170, the controller 180 uses a variety of sensors such as outdoor air temperature, internal air temperature, cooling water temperature, insolation amount, and discharge temperature and the input air temperature and the target air flow rate. Calculate the discharge temperature. If the PWM heat transfer heater 130 is required to operate, the PWM duty change rate according to the air flow rate change rate may be changed linearly according to the difference between the current air flow rate and the target air flow rate. Differentially calculates and outputs a PWM control signal for controlling the PWM electric heater 130.

Specifically, when the target air volume is relatively small, the controller 180 calculates a relatively small PWM duty change rate for each air flow rate so that the air temperature passing through the PWM heat transfer heater 130 may change linearly. That is, the air temperature passing through the PWM heat transfer heater 130 is linearly changed so that the discharge temperature can be stably reached to ensure a more comfortable indoor environment of the vehicle.

When the target air volume is relatively large, the controller 180 relatively calculates the PWM duty variation rate for each air flow rate so that the air temperature passing through the PWM heat heater 130 may change linearly. That is, the air temperature passing through the PWM heat transfer heater 130 is linearly changed so that the discharge temperature can be stably reached to ensure a more comfortable indoor environment of the vehicle.

The power supply unit 190 turns on / off the power supplied to the PWM heat heater 130 according to the PWM control signal output from the controller 180. That is, a driving signal for repeating the process of turning on / off the PWM heat heater 130 is outputted to the PWM heat heater 130.

As described above, the vehicle air conditioner according to the present invention is required to secure a heat source when the PWM heat transfer heater 130 is operated to pass through the PWM heat transfer heater 130 by differentially applying the PWM duty change rate according to the air flow rate according to the air volume By changing the air temperature linearly, the discharge temperature can be stably reached, thereby ensuring a more comfortable indoor environment of the vehicle.

7 is a graph of discharge temperature and duty relationship.

The discharge temperature is different even with the same PWM duty output depending on the amount of air applied to the PWM electric heater 130. That is, when the air volume is low, the discharge temperature is higher than when the air volume is high even at the low PWM duty output.

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

Referring to FIG. 8, a control method of a vehicle air conditioner including a blower for blowing air according to the present invention, an evaporator for cooling the air blown by the blower, and a PWM heat transfer heater for heating the air passing through the evaporator. When the air conditioner for the vehicle is turned on and the user inputs the set temperature, the target air flow rate and the target discharge temperature are calculated by using various sensors such as outdoor temperature, air temperature, cooling water temperature, insolation amount, and discharge temperature and input set temperature. (S110), (S120).

If the PWM heat heater is approved for operation as the heat source needs to be secured, the temperature of the air passing through the PWM duty and PWM heat heater may change linearly according to the difference between the current air flow and the target air flow. The PWM duty change rate for each air flow rate is differentially calculated to output a PWM control signal for controlling the PWM electric heater (S130) and (S140).

That is, when the heater controller requests the electronic control unit to approve the operation of the PWM heat transfer heater, and the electronic control unit approves the operation of the PWM heat transfer heater, the air temperature passing through the PWM heat transfer heater changes linearly according to the air volume. In order to stably reach the discharge temperature, the PWM duty variation rate for each air flow rate is differentially calculated to output a PWM control signal for controlling the PWM heat transfer heater.

At this time, when the target air volume is relatively small, the PWM duty variation rate for each air flow rate is relatively small, and when the target air volume is relatively high, the PWM duty change rate for each air volume change rate is relatively large.

Finally, the power supplied to the PWM heat heater is turned on / off according to the output PWM control signal (S150). That is, the driving signal for repeating the process of turning on / off the PWM heater is output to the PWM heater.

As described above, in the control method of the vehicle air conditioner according to the present invention, when the PWM heat transfer heater is activated to secure the heat source, the air temperature passing through the PWM heat transfer heater by differentially applying the PWM duty change rate according to the air flow rate according to the air volume By changing linearly, it is possible to stably reach the discharge temperature to ensure a more comfortable indoor environment of the vehicle.

Now, the operation of the vehicle air conditioner according to the present invention will be described.

When the vehicle is started and the air conditioner is turned on, the controller calculates the target air flow rate and the target discharge temperature using various sensors and the temperature set by the user through the operation unit.

And, if it is necessary to secure a heat source, the PWM heat transfer heater is operated.

At this time, the PWM control for controlling the PWM heat transfer heater by differentially calculating the PWM duty change rate according to the air flow rate change rate so that the air temperature passing through the PWM heat transfer heater changes linearly according to the air flow rate to reach the discharge temperature stably. A signal is output, and the power supplied to the PWM heat heater is turned on / off according to the output PWM control signal.

In other words, by properly correcting that the air temperature passing through the PWM heat transfer heater does not change linearly, the vehicle interior temperature is controlled to rise slowly, that is, to change linearly. Accordingly, the passenger inside the vehicle may feel comfortable by gradually increasing the air temperature discharged into the vehicle interior regardless of the air volume even if the PWM heat transfer heater is operated.

On the other hand, while the vehicle air conditioner and the control method according to the present invention has been described according to a limited embodiment, the scope of the present invention is not limited to a specific embodiment, it will be apparent to those skilled in the art with respect to the present invention. Various alternatives, modifications, and changes can be made within the scope.

Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

11O: Motor 120: Blower
130: PWM electric heater 140: temp door
150: evaporator 160: vent
170: operation unit 180: control unit
190: power supply

Claims (6)

For a vehicle comprising a blower 120 for blowing air, an evaporator 150 for cooling the air blown by the blower 120, a PWM heat transfer heater 130 for heating the air passing through the evaporator 150 In the air conditioning apparatus,
An operation unit 170 for receiving a set temperature from a user;
When the set temperature is input through the operation unit 170, the target air volume and the target discharge temperature are calculated using the sensor and the input set temperature, and if the PWM electric heater 130 needs to be operated, the difference between the current air volume and the target air volume is determined. The PWM duty signal for controlling the PWM heat transfer heater 130 is differentially calculated by differentially calculating the PWM duty change rate for each air flow rate so that the air temperature passing through the PWM duty and the PWM heat transfer heater 130 varies linearly. A controller 180 for outputting;
And a power supply unit (190) for turning on / off the power supplied to the PWM heat transfer heater (130) according to the PWM control signal output from the controller (180). The method according to claim 1,
The control unit (180) is a vehicle air conditioner, characterized in that for calculating a relatively small amount of PWM duty fluctuation when the target air volume. The method according to claim 1,
The control unit (180) is a vehicle air conditioner, characterized in that for calculating a relatively large amount of PWM duty variation when the target air volume is relatively large. In the control method of the vehicle air conditioner comprising a blower for blowing air, an evaporator for cooling the air blown by the blower, a PWM heat transfer heater for heating the air passing through the evaporator,
Calculating a target air volume and a target discharge temperature by using a sensor and the input set temperature when the user inputs the set temperature from the user;
When the PWM heat transfer heater is required and the PWM heat transfer heater is approved, the PWM duty change rate according to the air flow rate can be linearly changed so that the PWM duty and the air temperature passing through the PWM heat transfer heater according to the difference between the current air flow rate and the target air flow change linearly. Differentially calculating and outputting a PWM control signal for controlling the PWM electric heater;
And turning on / off the power supplied to the PWM electric heater in accordance with the output PWM control signal. The method according to claim 4,
And a relatively small PWM duty fluctuation rate when the target air volume is relatively small. The method according to claim 4,
When the target air volume is relatively large, the control method of the vehicle air conditioner, characterized in that for calculating the PWM duty fluctuation rate relatively large.
KR1020100108763A 2010-11-03 2010-11-03 Air conditioner in vehicle and control method KR101342939B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101423149B1 (en) * 2012-06-27 2014-07-25 한라비스테온공조 주식회사 Ptc heater of air conditioning system for automotive vehicles
KR20150081878A (en) * 2014-01-07 2015-07-15 한라비스테온공조 주식회사 Air conditioning system for automotive vehicles
US20150321536A1 (en) * 2014-05-09 2015-11-12 Halla Visteon Climate Control Corp. Air conditioning system for motor vehicles
KR20150129289A (en) * 2014-05-09 2015-11-19 한온시스템 주식회사 Air conditioning system for automotive vehicles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009067224A (en) * 2007-09-13 2009-04-02 Denso Corp Vehicular air-conditioning device
JP2009202736A (en) 2008-02-27 2009-09-10 Denso Corp Air conditioner for vehicle
JP2010105505A (en) 2008-10-29 2010-05-13 Denso Corp Air conditioner for vehicle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101423149B1 (en) * 2012-06-27 2014-07-25 한라비스테온공조 주식회사 Ptc heater of air conditioning system for automotive vehicles
KR20150081878A (en) * 2014-01-07 2015-07-15 한라비스테온공조 주식회사 Air conditioning system for automotive vehicles
US20150321536A1 (en) * 2014-05-09 2015-11-12 Halla Visteon Climate Control Corp. Air conditioning system for motor vehicles
KR20150129289A (en) * 2014-05-09 2015-11-19 한온시스템 주식회사 Air conditioning system for automotive vehicles
US10457119B2 (en) * 2014-05-09 2019-10-29 Hanon Systems Air conditioning system for motor vehicles

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