KR20090072615A - Controller of air conditioning system for automotive vehicles - Google Patents

Abstract

A control device of a heating ventilation and cooling system for vehicles is provided to control the system while reducing the number of parts to thereby decrease the manufacturing cost. A control device of a heating ventilation and cooling system for vehicles includes an evaporator sensor(7), an air-conditioner switch(8), an indoor and outdoor air switch(9), a controller(10), and an outdoor air temperature converter(20). The evaporator sensor senses air temperature of an outlet of an evaporator. The air-conditioner switch selectively set on/off of an air conditioner. The indoor and outdoor air switch selectively sets indoor/outdoor air modes. The controller controls at least one of doors(12,14,15), a blower(16), a compressor(17), and a supplementary heater(18). The outdoor air temperature converter calculates an outdoor air temperature when an air-conditioner off signal is input from the air-conditioner switch and, simultaneously, an outdoor air mode signal is input from the indoor and outdoor air switch.

Description

CONTROLLER OF AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES}

The present invention relates to a control device for a vehicle air conditioning system. More particularly, the present invention relates to a control device for a vehicle air conditioning system that can obtain various data necessary for controlling the system without reducing the number of sensors.

Recently, the vehicle air conditioning system has been improved by an automatic control method.

The automatic control air conditioning system detects the vehicle's outdoor air temperature and humidity, the vehicle's air temperature and humidity, and solar radiation, and then automatically adjusts the vehicle's indoor temperature and humidity according to the detected data. Therefore, the room temperature and humidity of the vehicle are always kept comfortable.

On the other hand, such an automatic control system air conditioning system (hereinafter, abbreviated as "air conditioning system") has a control device for controlling the system.

As shown in FIG. 1, the control apparatus includes an in-car sensor 1 for sensing an indoor temperature of a vehicle, an outside air sensor 3 for sensing an outside temperature of the vehicle, and an amount of solar radiation. The solar sensor 5 for sensing, the evaporator sensor 7 for sensing the temperature of the outlet side of the evaporator, the air conditioner switch 8 for selectively setting the on / off of the air conditioner, and the internal / external air mode for selectively setting Internal and external air switches 9, and a controller 10 for processing data input from each of these sensors and switches.

In particular, the controller 10 processes the data input from each of the sensors 1, 3, 5, 7 and the switches 8, 9 to control the temperature control door 12, the internal and external air conversion doors 14, and the mode. The door 15, the blower 16, the compressor 17, the auxiliary heater 18, and the like are controlled. Therefore, the indoor temperature and humidity of the vehicle are always kept comfortable in accordance with the outdoor temperature and humidity.

However, such a conventional control device has been pointed out that the manufacturing cost is increased because a plurality of sensors are required to detect the temperature and humidity of the outdoor and indoor of the vehicle.

In particular, in recent years, since a lot of low-cost vehicles are being developed, there is a problem that conventional control devices that require a large number of sensors cannot meet the needs of low-cost vehicles. There is this.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a control apparatus for a vehicle air conditioning system that can obtain various data necessary for controlling the system even while reducing the number of sensors.

Another object of the present invention is to obtain various data necessary for the control of the system while reducing the number of sensors, so that the system can be controlled while reducing the number of components, and therefore, the vehicle air conditioning system which can reduce the manufacturing cost. It is to provide a control device of.

In order to achieve the above object, the control apparatus of the vehicle air conditioning system of the present invention includes an evaporator sensor for sensing the air temperature at the outlet side of the evaporator, an air conditioner switch for selectively setting the on / off of the air conditioner, and an internal / external air mode. A control device for a vehicle air conditioning system, comprising: an internal / external air switch configured to be set to the controller, and a controller for processing at least one of various door blower compressor auxiliary heaters by processing data inputted from these sensors and switches. When the air conditioner off signal is input and at the same time the external mode signal is input from the internal and external air switch, the air temperature conversion unit for calculating the outside air temperature by adding or subtracting a compensation value to the evaporator outlet air temperature input from the evaporator sensor, The controller may determine the outside temperature converted by the outside temperature converting unit. The air conditioning system is controlled by processing.

According to the control device of the vehicle air conditioning system according to the present invention, since the air temperature of the vehicle is calculated through the on / off state of the air conditioner and the evaporator temperature and the internal / outdoor mode state, a separate air sensor for detecting the outside air temperature There is no need.

In addition, since there is no need for an external air sensor, the number of parts can be reduced and the number of parts can be reduced, so that an effect of cost reduction can be expected.

In addition, when it is employed in low-cost vehicles that require cost reduction, it is possible to reduce the number of parts, it is possible to improve the price competitiveness of low-priced vehicles.

Best Mode for Carrying Out the Invention Preferred embodiments of a control apparatus for a vehicle air conditioning system according to the present invention will be described in detail with reference to the accompanying drawings (the same components will be described using the same reference numerals).

First, before looking at the features of the control device according to the present invention, a brief description of the control device of the vehicle air conditioning system with reference to FIG.

The control apparatus is provided with the in-car sensor 1, the solar sensor 5, the evaporator sensor 7, the air conditioner switch 8, and the internal and external air switch 9.

The in-car sensor 1 is a temperature sensor, and detects the indoor temperature of the vehicle and inputs it to the controller 10 to be described later. The solar sensor 5 is a kind of photosensor, and detects the amount of solar radiation external to the vehicle and inputs it to the controller 10.

The evaporator sensor 7 is a temperature sensor installed at the outlet side of the evaporator, and detects the air temperature at the outlet side of the evaporator, and then inputs the sensed air temperature at the outlet side of the evaporator to the controller 10.

The air conditioner switch 8 detects an ON / OFF state of the air conditioner and inputs the same to the controller 10. The internal / external air switch 9 detects whether the internal / external air conversion door 14 is in the "outdoor mode" state or the "outdoor mode" state and inputs it to the controller 10.

The controller 10 includes a microprocessor and a driving circuit, and is input from the inka sensor 1, the solar sensor 5, the evaporator sensor 7, the air conditioner switch 8, and the internal / external air switch 9. The data is processed and the temperature control door 12, the internal / external air conversion door 14, the mode door 15, the blower 16, the compressor 17, the auxiliary heater 18, etc. are controlled according to the processed results. .

Next, the features of the control device according to the invention will be described in detail with reference to FIG. 2.

First, the control device of the present invention includes a controller 10, which has a temperature controller 20.

The outside temperature converting unit 20 is a kind of temperature conversion program, and serves to calculate the outside temperature of the vehicle by processing data input from each sensor and the switch.

In particular, the air temperature at the evaporator outlet side (hereinafter abbreviated as "evaporator temperature") input from the evaporator sensor 7 is processed and converted into the corresponding ambient temperature, or the air conditioner input from the air conditioner switch 8 is turned on. Process the on / off state to convert to the corresponding ambient temperature, or process the internal / outdoor mode state input from the internal / external air switch 9 to convert to the corresponding ambient temperature, or evaporator of the evaporator sensor 7 It processes the two or three of the temperature and the air conditioner on / off state of the air conditioner switch (8) and the internal / external air mode state of the internal / external air switch (9) serves to convert to the corresponding outdoor air temperature.

That is, for example, when the "air conditioner off" signal is input from the air conditioner switch 8 and the "outer air mode" signal is input from the internal / external air switch 9, the outside air temperature of the vehicle is inputted from the evaporator sensor 7. Compensate and convert ΔT over the evaporator temperature.

If the air conditioner is "off" and at the same time "outside air mode", it means that the outside air is introduced and then passed through the evaporator where the outside air has stopped working, and the introduced outside air has stopped working. This is because the evaporator temperature can be estimated to be the outside air temperature as it passes.

Therefore, as the evaporator temperature input from the evaporator sensor 7, the outside air temperature is estimated, while the outside air flows inside the air conditioning unit (evaporator in the intake duct) located in the interior of the vehicle. If the outside temperature is calculated by adding or subtracting the temperature falling, that is, the compensation value ΔT, an accurate outside temperature can be derived. Preferably subtracted by the compensation value ΔT. This is because the interior air temperature is relatively higher than the outside air.

The formula for calculating the outside temperature is as follows.

Ambient temperature = air temperature at the outlet of the evaporator-ΔT

According to the test result of FIG. 3, when the "air conditioner off" state and the "outer mode" are shown, the outside air temperature is about 5 ° C. lower than the evaporator temperature. This is because the outdoor air introduced into the interior of the vehicle rises by about 5 ° C. under the influence of the interior air temperature while passing through the interior of the air conditioner.

Accordingly, when the outside temperature conversion unit 20 is in the "air conditioning off" state and "outside air mode", the outside air temperature of the vehicle is converted to 5 ° C lower than the evaporator temperature input from the evaporator sensor 7 so as to be converted. It is preferred to be configured.

Referring again to FIG. 2, the outside temperature conversion unit 20 receives an "air conditioning on" signal from the air conditioner switch 8 and an "outdoor mode" signal from the inside and outside air switch 9, and the evaporator sensor ( If the evaporator temperature input at 7) is 0 ° C. or less, the outside air temperature of the vehicle is converted to a lower temperature by ΔT than the evaporator temperature input at the evaporator sensor 7.

If the air conditioner is "on", when the evaporator temperature is 0 ° C. or less, it means that the compressor 17 is cut-off to prevent icing of the evaporator, and if the compressor 17 is cut off, This means that the introduced outdoor air passes through the evaporator that has stopped operating. If the introduced outdoor air passes through the evaporator that has stopped operating, it is possible to estimate that the evaporator temperature is the outdoor air temperature.

Accordingly, as the evaporator temperature input from the evaporator sensor 7, the outside air temperature is estimated, and as described above, the outside air temperature of the vehicle interior is changed while the outside air flows inside the air conditioner (evaporator in the intake duct) located inside the vehicle. If the outside air temperature is calculated by adding or subtracting the temperature rising or falling under the influence, that is, the compensation value ΔT, an accurate outside air temperature can be derived.

Since the method for calculating the outside temperature is the same as the above-described formula and the test result of FIG. 3, a detailed description thereof will be omitted. For reference, the cut-off temperature of the compressor 17 is approximately when the outlet side air temperature of the evaporator is 0 ° C to 3 ° C.

Referring again to FIG. 2, the outside temperature conversion unit 20 receives an "air conditioning on" signal from the air conditioner switch 8 and an "outdoor mode" signal from the inside and outside air switch 9, and the evaporator sensor ( If the evaporator temperature input in 7) exceeds 0 ℃, the outside air temperature of the vehicle is treated as the reference temperature and converted.

In other words, when the air conditioner is in the "on" state and at the same time in the "outdoor mode" and the evaporator temperature exceeds 0 ° C, since the introduced outside air is cooled while passing through the evaporator, estimation of the outside air temperature through the evaporator temperature is virtually impossible. Therefore, a reference temperature corresponding to the above conditions (air condition " on ", " external mode ", evaporator temperature exceeding 0 DEG C) is arbitrarily set, and the set reference temperature is converted to the outside air temperature.

Ambient temperature changes according to season / day / night / weather condition, but in Korea, 20 ℃ is the most common and common reference value. Therefore, it is preferable to set the reference temperature at 20 ° C.

According to the test result of FIG. 4, when the air conditioner is "on" and at the same time in the "outdoor mode", when the outside air temperature is converted to 20 ° C and the air conditioning system is controlled based on this, the outside air temperature (single dashed line) is 20 ° C. Even if it fluctuates around -40 degreeC, the indoor control temperature or the room average temperature shows little deviation of about 2 degreeC. Therefore, even if the outside air temperature is converted to 20 ° C., the interior temperature can be comfortably controlled.

In particular, when the air conditioning system is controlled by converting the outside air temperature to 20 ° C., the indoor temperature of the vehicle is always maintained at around 25 ° C. regardless of the outside temperature. Therefore, the interior of the vehicle is always comfortable. It can be seen that the state is maintained.

Again, referring to FIG. 2, when the "betting mode" signal is input from the internal / external air switch 9, the outside temperature conversion unit 20 processes and converts the outside temperature of the vehicle to a reference temperature.

In other words, if the air conditioning system is the "betting mode", since the indoor air of the vehicle is circulated, estimation of the outside air temperature is virtually impossible. Therefore, the reference temperature corresponding to the above condition ("beting mode") is arbitrarily set, and the set reference temperature is converted into the outside air temperature.

As described above, the outside air temperature varies depending on the season / day / night / weather condition, etc., but in Korea, 20 ° C. is the most common and common reference value. Therefore, it is preferable to set the reference temperature at 20 ° C.

According to the test result of FIG. 5, when the air conditioner is controlled based on this by converting the outside air temperature to 20 ° C. in the “beting mode”, the indoor temperature of the vehicle is maintained comfortably.

In particular, even if the air conditioning system is controlled by converting the outside air temperature to 20 ° C., it can be seen that the change in the room temperature for the case of “outdoor mode” is within about 2 ° C. Therefore, even in the " betting mode ", even if the outside temperature is converted to 20 deg. C, the indoor temperature of the vehicle can always be maintained comfortably.

On the other hand, the outside temperature conversion unit 20, the on / off state of the air conditioner, the evaporator temperature, and the "outside air temperature" corresponding to the internal / outdoor mode state is variously built-in, these data are a number of test results Based on the test results obtained.

According to the outside temperature conversion unit 20 having such a configuration, since the outside air temperature of the vehicle is calculated through the on / off state of the air conditioner and the evaporator temperature and the inside / outdoor mode state, a separate outside air for detecting the outside temperature No sensors are needed.

Therefore, the number of parts can be reduced, and the number of parts can be reduced, so that an effect of cost reduction can be expected. In particular, by adopting to low-cost vehicles requiring cost reduction, it is possible to provide the effect of cost reduction, thus improving the price competitiveness of low-priced vehicles.

Next, a method of obtaining the outside air temperature using the control device of the present invention having such a configuration will be described with reference to FIGS. 2 and 4.

First, in the state where the air conditioning system is ON (S101), it is determined whether or not the "outdoor mode" (S103).

As a result of the determination, if it is not the "outdoor mode", it is processed as "betting mode" and converts the outside air temperature of the vehicle into the reference temperature (S105). At this time, since the reference temperature is set to 20 ° C, the outside air temperature is converted to 20 ° C.

On the other hand, if the determination result is the "outdoor mode", it is determined again whether it is in the "air conditioning ON" state (S107). As a result of the determination, if it is not the "air conditioner on" state, the process is regarded as the "air conditioner off" state, and the outside air temperature of the vehicle is processed to be converted to be lower by ΔT than the evaporator temperature input from the evaporator sensor 7 (S109). At this time, since ΔT is about 5 ° C., the ΔT is converted into a low one about 5 ° C.

If it is determined that the "air conditioner on" state is reached, it is again determined whether the evaporator temperature is 0 ° C or less (S111). As a result of the determination, if the evaporator temperature is 0 ° C. or less, the current outside air temperature of the vehicle is processed to be converted to be lower by ΔT than the evaporator temperature input from the evaporator sensor 7 (S109). At this time, since ΔT is about 5 ° C., the ΔT is converted into a low one about 5 ° C.

On the other hand, when the determination result, the evaporator temperature exceeds 0 ℃, converts the outside air temperature of the vehicle to the reference temperature (S105). At this time, since the reference temperature is set to 20 ° C, the outside air temperature is converted to 20 ° C.

The outside air temperature converted through the same method as described above is input to the controller 10, and the outside air temperature input to the controller 10 is various doors 12, 14, 15, blower 16, and compressor 17. This is the main information needed to control the lights.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

1 is a block diagram showing a control device of a conventional vehicle air conditioning system;

2 is a block diagram showing a control device of a vehicle air conditioning system according to the present invention;

3 is a graph showing a deviation between an evaporator temperature and an outdoor air temperature when the air conditioner is turned off and in an outdoor air mode;

4 is a graph showing the relationship between the vehicle's indoor temperature and the outside air temperature when the air conditioner is turned on and the outside air mode and the evaporator outlet air temperature is 0 ° C. or lower, when the air temperature is converted to 20 ° C. to control the air conditioning system. ,

5 is a graph showing the amount of change in the indoor temperature when the air conditioning system controls the air conditioning system based on this by converting the outside air temperature to 20 ℃ when the air conditioning system,

6 is a flowchart showing a method of obtaining an outside air temperature using the control device of the present invention.

♣ Explanation of symbols for main part of drawing ♣

1: In-Car Sensor 5: Insolation Sensor

7: Evaporator Sensor 8: A / C Switch

9: Internal and external air switch 10: Controller

12: temperature control door 14: internal and external air conversion door

16: Blower 17: Compressor

18: auxiliary heater 20: outside temperature conversion unit

Claims (4)

An evaporator sensor (7) for sensing the air temperature at the outlet side of the evaporator, an air conditioner switch (8) for selectively setting the on / off of the air conditioner, an internal and external air switch (9) for selectively setting the internal / external air mode, and Controller for controlling at least one of the various heaters 12, 14, 15, blower 16, compressor 17 and auxiliary heater 18 by processing the data input from these sensors 7 and switches 8, 9; A control apparatus for a vehicle air conditioning system comprising (10), When the air conditioner off signal is input from the air conditioner switch 8 and the outdoor mode signal is input from the internal / external air switch 9, a compensation value ΔT is applied to the evaporator outlet air temperature input from the evaporator sensor 7. It further includes an outside air temperature conversion unit 20 for calculating the outside air temperature by subtracting (), The controller (10) is a control device for a vehicle air conditioning system, characterized in that for controlling the air conditioning system by processing the outside temperature converted by the outside temperature conversion unit (20). The method of claim 1, The outside temperature conversion unit 20, The air conditioner on signal is inputted from the air conditioner switch 8 and the outdoor air mode signal is inputted from the internal / external air switch 9 and the evaporator outlet air temperature inputted from the evaporator sensor 7 is cut off of the compressor 17. If it is below (Cut-Off) temperature, And an external air temperature is calculated by adding or subtracting a compensation value ΔT to the evaporator outlet air temperature inputted from the evaporator sensor (7). The method according to claim 1 or 2, The outside temperature conversion unit 20, The internal air mode signal is inputted from the internal / external air switch 9 or the air conditioner ON signal is inputted from the air conditioner switch 8 and the external air mode signal is inputted from the internal / external air switch 9 and the evaporator sensor 7 is input. If the evaporator outlet side air temperature input from exceeds the cut-off temperature of the compressor (17), the controller of the vehicle air conditioning system, characterized in that for converting the outside air temperature of the vehicle to a predetermined reference temperature. The method according to claim 1 or 2, The outside air temperature is a control device for a vehicle air conditioning system, characterized in that estimated by subtracting a predetermined compensation value (ΔT) from the air temperature of the evaporator outlet side.

Images