KR102060512B1 - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to a vehicle air conditioner, by improving the detection and discriminating structure of the "icing generation" of the evaporator, it is possible to increase the "icing occurrence discrimination accuracy" of the evaporator, thereby, to respond quickly to the "icing generation" of the evaporator The purpose is to make it possible.
In order to achieve the above object, the present invention provides a blower for sucking and blowing air into and out of an interior, an evaporator for cooling air blown into a vehicle with refrigerant supplied from a compressor, and discharge of air blown into a vehicle interior. In the vehicle air conditioner comprising a plurality of mode doors for adjusting the direction, and the temp door 70 for adjusting the temperature of the air blown into the cabin, Icing to determine whether or not the icing is generated on the surface of the evaporator Generation determination means; When it is determined that the icing of the evaporator is generated by the icing occurrence determining means, the compressor is cut-off while entering the icing prevention mode to cut off the refrigerant supplied to the evaporator, and the mode doors are in floor mode. And a control unit for discharging air passing through the evaporator to the bottom surface of the vehicle interior.

Description

Air Conditioning System for Vehicles {AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES}

The present invention relates to a vehicle air conditioner, and more particularly, by improving the detection and discriminating structure of the "icing generation" of the evaporator, it is possible to increase the "icing generation discrimination accuracy" of the evaporator, through which the "icing generation of the evaporator It relates to a vehicle air conditioner that can respond quickly to.

An air conditioner is installed in a car to cool and heat a cabin. This air conditioning apparatus is equipped with the evaporator 1 of an air conditioner, as shown in FIG.

The evaporator 1 introduces the refrigerant supplied from the compressor 3 into an internal flow path (not shown), and then heats the introduced refrigerant with air blown by the blower 5 to generate cold air, and generates the cold air. Cool the inside of the vehicle by supplying it to the vehicle interior.

On the other hand, when the temperature of the refrigerant circulating along the internal flow path is too low, such an evaporator 1 may cause moisture to freeze on its surface (hereinafter referred to as "icing"). Therefore, the air conditioning apparatus is provided with the icing prevention device 7 for preventing the icing phenomenon of the evaporator 1. As shown in FIG.

The icing prevention device 7 includes a temperature sensor 7a for sensing the temperature of the downstream air that has passed through the evaporator 1 and a downstream air temperature of the evaporator 1 input from the temperature sensor 7a. And a control unit 7b for controlling the compressor 3 of the air conditioner.

The control unit 7b is equipped with a microprocessor. When the evaporator downstream air temperature is input from the temperature sensor 7a, the input "evaporator downstream air temperature" is a preset temperature, for example, a freezing point. It determines whether it falls below (0 degreeC).

As a result of the determination, when the "evaporator downstream air temperature" falls below the freezing point (0 ° C), it is determined that an icing phenomenon occurs on the surface of the evaporator 1, and the compressor 3 of the air conditioner is cut off (Cut-Off). ) Therefore, the refrigerant supplied to the evaporator 1 is cut off. This prevents the icing phenomenon of the evaporator 1.

Usually, the temperature sensor 7a of the icing prevention device 7 is provided in the downstream part of the evaporator 1, but in the part which maintains the lowest temperature among the temperature of each part of the evaporator 1, It is installed to correspond. This is because water freezing starts from the surface of the evaporator 1 at the lowest temperature.

However, according to the conventional icing prevention device 7, the parts of the evaporator 1 having the lowest temperature are changed differently according to the type of the evaporator 1 and according to the internal and external temperature conditions and the driving habits of the driver. , There is a disadvantage that the "icing generating part" of the evaporator 1 changes from time to time.

And because of this disadvantage there is a problem that the only one temperature sensor (7a) fixed to a specific portion is not able to accurately detect the "icing occurrence" of the evaporator 1, because of this problem "icing occurrence" of the evaporator (1) There is a drawback that it cannot cope with.

The present invention has been made to solve the conventional problems as described above, the object of which is to improve the "icing generation" detection and discrimination structure of the evaporator, it is possible to increase the "icing generation determination accuracy" of the evaporator, through The present invention provides a vehicle air conditioner that can respond quickly to the "icing generation" of an evaporator.

Still another object of the present invention is to increase the "icing generation discrimination accuracy" of the evaporator, through which it is possible to quickly eliminate the "icing" of the evaporator, by being configured to respond quickly to the "icing generation" of the evaporator. As a result, there is provided a vehicle air conditioner capable of improving the cooling performance in a vehicle interior.

In order to achieve the above object, the vehicle air conditioner according to the present invention, a blower for sucking the internal and external air and blowing into the cabin, an evaporator for cooling the air blown into the cabin with the refrigerant supplied from the compressor, the interior In the vehicle air conditioner comprising a plurality of mode doors for adjusting the discharge direction of the air blown into the vehicle, and a temporal door for adjusting the temperature of the air blown into the vehicle cabin, whether the icing is generated on the surface of the evaporator; Icing occurrence determining means for discriminating; If it is determined that the icing of the evaporator is generated by the icing occurrence determining means, the compressor is cut-off while entering the icing prevention mode to cut off the refrigerant supplied to the evaporator, and the mode doors are It is characterized in that it comprises a control unit for controlling the floor mode (Floor Mode) to discharge the air passing through the evaporator to the bottom surface of the vehicle interior.

Preferably, the control unit, when entering the icing prevention mode, by increasing the rotational stage of the blower to a predetermined reference stage, characterized in that to increase the amount of air blown to the evaporator side.

In addition, the icing generation determination means, respectively, at intervals downstream of the evaporator corresponding to the left and right of the lower part of the evaporator so as to sense the temperature of the air passing through the left and right of the lower part of the evaporator, respectively. First and second evaporator sensors spaced apart from each other; And the controller to determine that icing is generated in the evaporator when a temperature deviation between the left and right downstream air temperatures input by the first and second evaporator temperature sensors is equal to or greater than a preset reference temperature deviation. It is characterized by.

In some cases, the icing generation determination means is spaced apart at intervals downstream of the evaporator corresponding to the upper and lower sides of the evaporator so as to sense the temperature of the air passing through the upper and lower sides of the evaporator, respectively. First and second evaporator sensors that are installed so as to be installed; And a controller configured to determine that icing is generated in the evaporator when a temperature deviation between upper and lower air temperatures input by the first and second evaporator temperature sensors is equal to or greater than a preset reference temperature deviation. It is characterized by.

In some cases, the icing generation determining means may include: a blower rotational speed detecting means for detecting a rotational speed of the blower; Icing on the evaporator when the current rotational speed of the blower input from the blower rotational speed sensing means is reduced to more than a predetermined first reference ratio relative to the rotational speed of the blower under normal conditions by automatic control or manual control. It characterized in that it comprises the control unit for determining that this has occurred.

According to the vehicle air conditioner according to the present invention, the "temperature deviation" of the left and right air, or the "temperature deviation" of the upper and lower air or the blower of the evaporator which reacts sensitively depending on whether the "icing" of the evaporator occurs. In consideration of the rotational speed, since the structure of discriminating the "icing occurrence" of the evaporator, there is an effect that can significantly increase the "accuracy determination accuracy" of the evaporator compared to the prior art.

In addition, the "icing generation discrimination accuracy" of the evaporator can be significantly increased, so that the "icing generation" of the evaporator can be quickly responded, thereby quickly removing the "icing" of the evaporator, and as a result, There is an effect that can improve the cooling performance of the room.

In addition, when the "icing" of the evaporator is removed, the hot and humid air passing through the evaporator is directed to the floor surface of the vehicle, and thus, the comfort in the vehicle can be improved when the "icing" of the evaporator is removed. It works.

In addition, when removing the "icing" of the evaporator, the structure of increasing the number of revolutions of the blower to increase the amount of air blown to the evaporator side, the advantage of being able to more effectively and quickly remove the "icing" of the surface of the evaporator There is this.

1 is a view showing a conventional vehicle air conditioner,
2 is a view showing the configuration of the first and second embodiments of the vehicle air conditioner according to the present invention;
3 is a perspective view of an evaporator showing an example of installation of first and second evaporator sensors constituting the vehicle air conditioner of the first embodiment;
4 is a flowchart showing an operation example of the vehicle air conditioner of the first embodiment;
5 is a perspective view of an evaporator showing an installation example of first and second evaporator sensors constituting the vehicle air conditioner of the second embodiment;
6 is a flowchart showing an operation example of the vehicle air conditioner of the second embodiment;
7 is a view showing the configuration of a third embodiment of a vehicle air conditioner according to the present invention;
8 is a flowchart showing an operation example of the vehicle air conditioner of the third embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings (the same components will be described with the same reference numerals).

[First Embodiment]

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

The vehicle air conditioner includes an evaporator 1 of an air conditioner. The evaporator 1 of the air conditioner introduces the refrigerant supplied from the compressor 3 into the internal flow path, and then heats the introduced refrigerant with the air blown by the blower 5 to generate cold air. Then, the generated cold air is supplied into the cabin. Therefore, the interior of the vehicle is cooled.

And the air conditioning apparatus is provided with a plurality of mode doors (10, 12, 14). The plurality of mode doors 10, 12, 14 include a Def. Door 10, a Vent Door 12, and a Floor Door 14, these The mode doors 10, 12, and 14 control the discharge direction of the air supplied into the vehicle interior.

In particular, the mode doors 10, 12, and 14 include the "Vent Mode", "Bi-Level Mode", "Floor Mode", and "Mix Mode". ) And "Def. Mode" and the like, and the mode doors 10, 12 and 14 controlled in this way control the discharge direction of the air supplied into the vehicle interior.

For reference, the "vent mode" is a mode for discharging cold and hot air toward the passenger's face, and the "bi level mode" is a mode for discharging cold and hot air to the floor surface of the cabin and the face of the passenger. "Floor mode" is a mode which discharges cold and hot air to the floor surface of a vehicle interior.

The "mix mode" is a mode for discharging cold and hot air to the window glass and the floor surface in the cabin, and the "diff mode" is a mode for discharging cold and hot air in the window glass direction.

Next, the features of the vehicle air conditioner according to the present invention will be described in detail with reference to FIGS. 2 and 3.

First, the air conditioner of this invention is equipped with the icing prevention apparatus 20 for preventing the icing phenomenon of the evaporator 1. As shown in FIG.

The icing prevention device 20 includes icing occurrence determining means 30 for determining whether an icing phenomenon has occurred on the surface of the evaporator 1.

The icing generation discrimination means 30 includes a first evaporator temperature sensor 32 and a second evaporator temperature sensor 34 provided on the downstream side of the evaporator 1, and these first and second evaporator temperature sensors 32, 34 is provided with a control unit 40 for determining "Icing generation" of the evaporator 1 through the air temperature data input.

The first and second evaporator temperature sensors 32 and 34 are provided on the downstream side of the evaporator 1, but as shown in FIG. 3, spaced apart from the portions corresponding to the left and right sides of the evaporator 1, respectively. It is installed spaced apart. In particular, it is provided spaced apart from each other at portions corresponding to the left and right sides of the lower portion of the evaporator (1).

Here, the first and second evaporator temperature sensors 32, 34 are provided at the ends of the supports 32a, 34a, and the supports 32a, 34a are fixedly installed in an air conditioning case (not shown). .

The first and second evaporator temperature sensors 32 and 34 detect the temperature of the air passing through the left and right portions of the evaporator 1, respectively, and then detect the air temperatures downstream of the detected evaporator 1 left and right. The data is input to the controller 40.

The control unit 40 is equipped with a microprocessor, and when the air temperature data of the left and right downstream of the evaporator 1 are input from the first and second evaporator temperature sensors 32 and 34, respectively, between the two input temperatures. It is determined whether the temperature deviation is greater than or equal to the preset reference temperature deviation.

As a result of the determination, if the temperature deviation between the two temperatures is equal to or greater than the “standard temperature deviation”, the controller 40 determines that the “icing phenomenon” has occurred on the surface of the evaporator 1 and enters the “icing prevention mode”.

And the control part 40 which entered into the "icing prevention mode" cuts off the compressor 3 of an air conditioner. Therefore, the refrigerant supplied to the evaporator 1 is blocked to prevent the "icing phenomenon" of the evaporator 1 at its source. This prevents a decrease in cooling performance due to "icing" of the evaporator 1.

On the other hand, the control unit 40 is configured to control the respective mode doors 10, 12, 14 to the "floor mode" when entering the "icing prevention mode". Thus, the air passing through the evaporator 1 is discharged to the bottom surface of the vehicle interior.

The reason for this configuration is that the cooling operation of the evaporator 1 is stopped in the "icing prevention mode", so that the air passing through the evaporator 1 is hot and humid, and the hot and humid air is directed to the passenger's foot. This is to prevent the discomfort of the passengers as much as possible.

And the control part 40 is comprised so that the rotational stage number of the blower 5 may be raised to the preset "number of reference stages" at the time of entering "Icing prevention mode". For example, it is configured to raise to "three steps".

The reason for this is to increase the air volume of the air blown to the evaporator 1 side in the " icing prevention mode " to quickly thaw the icing formed on the evaporator 1 surface.

Here, when the rotational stage of the blower 5 before entering the "icing prevention mode" is equal to or greater than the "standard number of stages", the control unit 40 enters the "icing prevention mode" and the blower 5 before entering the "icing prevention mode". It is configured to keep the number of revolutions of

On the other hand, the "reference temperature deviation" built into the control unit 40 is preferably set to "6 ° C".

The reason for this setting is that when the temperature deviation between the air temperatures passing through the left and right sides of the lower part of the evaporator 1 is "6 degrees Celsius" or more, "icing generation" starts on the surface of the evaporator 1. Because it appears.

In addition, the controller 40 may determine that the temperature deviation between the two temperatures input from the first and second evaporator temperature sensors 32 and 34 is greater than or equal to the “standard temperature deviation” at the time of determining the icing occurrence of the evaporator 1. , The at least one of the temperature data of the first and second evaporator temperature sensors 32 and 34 is configured to enter the "icing prevention mode" only when at least one is less than the preset "first reference temperature".

For example, it is configured to enter the "icing prevention mode" only when at least one of the temperature data of the first and second evaporator temperature sensors 32, 34 is less than "3 ° C".

The reason for this configuration is that, when the air temperature passing through the left and right sides of the evaporator 1 is more than " 3 ° C. ", the probability of occurrence of "icing" on the surface of the evaporator 1 is very low.

After the entry of the “icing prevention mode”, the controller 40 includes the “second reference temperature” in which all of the temperature data input from the first and second evaporator temperature sensors 32 and 34 are higher than the “first reference temperature”. In the case of abnormality, it is determined that the "icing" of the evaporator 1 has been completely eliminated, and is released from the "icing prevention mode".

For example, when both the temperature data of the first and second evaporator temperature sensors 32 and 34 are "10 ° C" or more, it is configured to be released from the "icing prevention mode".

And the control part 40 canceled | released from the "icing prevention mode" returns the compressor 3 of each air conditioner, each mode door 10, 12, 14, and blower 5 to an original state. Therefore, the air conditioner is controlled to operate normally.

On the other hand, the control unit 40, when entering and releasing the "icing prevention mode", the entry and release of the "icing prevention mode" on the display unit 50 of the controller (not shown), specific characters or symbols, or It is configured to display as a picture.

Thus, the user is informed that "icing" is currently generated in the evaporator 1 and is being processed, or that the "icing" of the evaporator 1 has been completely processed.

Next, an operation example of the present invention having such a configuration will be described with reference to FIGS. 2 and 4.

First, in a state in which the air conditioner is turned on (S101), it is determined whether at least one of the air temperatures passing through the left and right sides of the evaporator 1 is less than the "first reference temperature" (S103). For example, it is judged whether it is less than 3 degreeC.

As a result of the determination, if at least one of the air temperatures passed through the left and right sides of the evaporator 1 is less than 3 ° C., the controller 40 determines the " temperature between the two air temperatures passed through the left and right sides of the evaporator 1. It is determined again whether or not the deviation is "standard temperature deviation" (S105). For example, it determines whether it is 6 degreeC or more.

As a result of the determination, if the temperature deviation between the two temperatures is 6 ° C. or more, the controller 40 determines that “icing” has occurred on the surface of the evaporator 1 and enters the “icing prevention mode” (S107).

Then, the control unit 40 entering the "icing prevention mode" cuts off the compressor 3 of the air conditioner, controls the respective mode doors 10, 12, and 14 in the "floor mode", and rotates the blower 5. The number of stages is raised to the "standard stage" (S109).

Then, while the refrigerant supplied to the evaporator 1 is blocked, the "icing phenomenon" of the evaporator 1 is prevented. And hot and humid air passing through the evaporator (1) is discharged to the bottom surface of the vehicle interior to improve the comfort in the vehicle interior. And while the air volume of the air blown to the evaporator 1 side increases, "Icing" of the evaporator 1 is removed quickly.

On the other hand, after the entry of the "icing prevention mode", the control unit 40 displays the entry of the "icing prevention mode" on the display unit 50 of the controller (S109). The user then knows that the "icing" of the evaporator 1 is currently being processed.

2 and 4, the controller 40 enters the "icing prevention mode", and the air temperature passing through the left and right sides of the evaporator 1 is equal to or greater than the "second reference temperature". Re-determination of the recognition (S111). For example, it is determined again whether it is 10 degreeC or more.

As a result of determination, when it is 10 degreeC or more, it determines with the "icing" of the evaporator 1 being completely eliminated, and it releases from an "icing prevention mode" (S113).

The controller 40 released from the icing prevention mode resets the compressor 3 of the air conditioner, the mode doors 10, 12, 14, the blower 5, and the display unit 50 of the controller to their original state. It returns to (S115). The air conditioner then operates normally again.

According to the present invention having such a configuration, since the "icing occurrence" of the evaporator 1 is determined based on the "temperature deviation" of the air passing through the left and right sides of the evaporator 1, only one temperature data is used. On the basis of this, it is possible to significantly increase the "accuracy determination accuracy" of the evaporator 1 as compared with the conventional technique of detecting the "icing occurrence" of the evaporator 1.

In addition, since the "icing occurrence discrimination accuracy" of the evaporator 1 can be significantly increased, the "icing generation" of the evaporator 1 can be quickly responded, thereby quickly "icinging" the evaporator 1. It can remove, and as a result, the cooling performance in a vehicle interior can be improved.

In addition, when removing the "icing" of the evaporator 1, since the hot and humid air passing through the evaporator 1 is directed to the bottom surface of the vehicle interior, when the "icing" of the evaporator 1 is removed The comfort of the room can be improved.

In addition, when removing the "icing" of the evaporator 1, since the number of rotations of the blower 5 is increased to increase the air volume of the air blown to the evaporator 1 side, the "icing" of the surface of the evaporator 1 Can be removed quickly.

Second Embodiment

Next, Figure 5 is a view showing a second embodiment of a vehicle air conditioner according to the present invention.

In the air conditioning apparatus of the second embodiment, the first and second evaporator temperature sensors 32 and 34 of the icing generation determining means 30 are spaced apart from each other at portions corresponding to the upper and lower sides of the evaporator 1, respectively. Has a structure to be installed.

The first and second evaporator temperature sensors 32 and 34 installed in this way detect the temperature of the air passing through the upper and lower portions of the evaporator 1, respectively, and detect the air temperature above and below the evaporator 1, respectively. The data is input to the controller 40.

5 and 2, when the air temperature data upstream and downstream of the evaporator 1 is input from the first and second evaporator temperature sensors 32 and 34, respectively, It is determined whether the temperature deviation between the air temperatures on the upper and lower sides of the evaporator 1 is equal to or more than the preset reference temperature deviation.

As a result of the determination, if it is equal to or greater than the reference temperature deviation, the controller 40 determines that the "icing phenomenon" has occurred on the surface of the evaporator 1, and enters the "icing prevention mode" and enters the "icing prevention mode". One control part 40 cuts off the compressor 3 of an air conditioner.

Therefore, the refrigerant supplied to the evaporator 1 is blocked to prevent the icing phenomenon of the evaporator 1 at its source.

On the other hand, as in the first embodiment described above, the control unit 40 controls each of the mode doors 10, 12, 14 to the "floor mode" when entering the "icing prevention mode", and the blower 5 Raise the number of revolutions to "standard number".

In addition, the controller 40 may control the first and second evaporator temperature sensors 32, even if the temperature deviation between the two temperatures input from the first and second evaporator temperature sensors 32 and 34 is equal to or greater than the “standard temperature deviation”. Only when at least one of the temperature data of 34) is less than the " first reference temperature ", it is configured to enter the "icing prevention mode".

For example, the "icing prevention mode" only when the temperature data of the temperature data of the first and second evaporator temperature sensors 32 and 34 is set to correspond to the upper portion of the evaporator 1 is less than "3 ° C". Is configured to enter.

The reason for this configuration is that, when the air temperature passing through the upper portion of the evaporator 1 is " 3 ° C. " or higher, the probability of occurrence of "icing" on the surface of the evaporator 1 is very low.

After the entry of the “icing prevention mode”, the controller 40 includes the “second reference temperature” in which all of the temperature data input from the first and second evaporator temperature sensors 32 and 34 are higher than the “first reference temperature”. In case of abnormality, the control unit 40 released from the "icing prevention mode" and judged that the "icing" of the evaporator 1 has been completely eliminated, and the control unit 40 released from the "icing prevention mode" are connected to the compressor 3 of the air conditioner. Each mode door 10, 12, 14 and blower 5 are returned to an original state.

The control unit 40 having such a structure is the same as that of the above-described first embodiment, and thus a detailed description thereof will be omitted.

On the other hand, in the control unit 40 of the second embodiment, it is preferable that the built-in "reference temperature deviation" is set to "5 degreeC".

The reason for this setting is that, when the temperature deviation between the air temperatures passing through the upper and lower sides of the lower side of the evaporator 1 is "5 ° C" or more, "icing generation" starts on the surface of the evaporator 1. Because it appeared.

In particular, when the temperature of the air passing through the lower part of the evaporator 1 is 5 ° C. or more higher than the temperature of the air passing through the upper part of the evaporator 1, “icing occurs on the surface of the evaporator 1. "Because it appeared to begin.

Typically, surface condensate is collected in the lower part of the evaporator 1, and the surface condensate causes "icing" from the lower part of the evaporator 1, and evaporator because of the "icing" of the lower part of the evaporator 1. (1) The air passage in the lower part decreases drastically.

Therefore, the temperature of the air passing through the lower portion of the evaporator 1 must be higher than the temperature of the air passing through the upper portion of the evaporator 1, thereby, the air passing through the lower portion of the evaporator 1 Considering how much higher the temperature is than the temperature of the air passing through the upper portion of the evaporator 1, it is possible to determine the "icing occurrence" of the evaporator 1.

Next, an operation example of the second embodiment having such a configuration will be described with reference to FIGS. 2 and 6.

First, in a state in which the air conditioner is turned on (S201), it is determined whether the air temperature passing through the upper portion of the air temperature passing through the upper and lower sides of the evaporator 1 is less than the “first reference temperature”. (S203). For example, it is judged whether it is less than 3 degreeC.

As a result of the determination, if the air temperature passing through the upper portion of the evaporator 1 is less than 3 ° C., the controller 40 determines that the “temperature deviation” between the two air temperatures passing through the upper and lower sides of the evaporator 1 is “reference temperature. It is determined again whether or not the difference is "deviation" (S205). For example, it is judged whether the air temperature which passed the lower part of the evaporator 1 is 5 degreeC or more than the air temperature which passed the upper part of the evaporator 1.

As a result of the determination, the control unit 40 determines that "icing" has occurred on the surface of the evaporator 1 and enters the "icing prevention mode" if it is 5 degrees C or more (S207).

Then, the control unit 40 entering the "icing prevention mode" cuts off the compressor 3 of the air conditioner, controls the respective mode doors 10, 12, and 14 in the "floor mode", and rotates the blower 5. The number of stages is raised to the "standard stage" (S209).

Then, while the refrigerant supplied to the evaporator 1 is blocked, the "icing phenomenon" of the evaporator 1 is prevented. And hot and humid air passing through the evaporator (1) is discharged to the bottom surface of the vehicle interior to improve the comfort in the vehicle interior. And as the air volume of the air blown to the evaporator 1 side increases, the icing of the evaporator 1 is removed quickly.

On the other hand, after the entry of the "icing prevention mode", the control unit 40 displays the entry of the "icing prevention mode" on the display unit 50 of the controller (S209). The user then knows that the "icing" of the evaporator 1 is currently being processed.

2 and 6, the controller 40 enters the "icing prevention mode", and the air temperature passing through the upper and lower sides of the evaporator 1 is equal to or greater than the "second reference temperature". The recognition is again determined (S211). For example, it is determined again whether it is 10 degreeC or more.

As a result of determination, when it is 10 degreeC or more, it is determined that the "icing" of the evaporator 1 is completely eliminated, and it is canceled | released from the "icing prevention mode" (S213).

The controller 40 released from the icing prevention mode resets the compressor 3 of the air conditioner, the mode doors 10, 12, 14, the blower 5, and the display unit 50 of the controller to their original state. It returns to (S215). The air conditioner then operates normally again.

According to the present invention of the second embodiment having such a configuration, the evaporator 1 is based on the "temperature deviation" of the upper and lower air of the evaporator 1, which reacts sensitively depending on whether the "icing" of the evaporator 1 occurs. Since the structure of discriminating the "icing occurrence" of the evaporator 1, the "accuracy of the icing generation discrimination accuracy" of the evaporator 1 can be remarkably increased.

In addition, since the "icing occurrence discrimination accuracy" of the evaporator 1 can be significantly increased, the "icing generation" of the evaporator 1 can be quickly responded, thereby quickly "icinging" the evaporator 1. Can be removed.

Third Embodiment

Next, FIGS. 7 and 8 are views showing a third embodiment of the vehicle air conditioner according to the present invention.

As shown in FIG. 7, the air conditioner of the third embodiment includes icing occurrence determining means 30 for determining “icing occurrence” of the evaporator 1, wherein the icing occurrence determining means 30 includes a blower. Rotational speed detecting means 60 and the control unit 40 for determining the "icing generation" of the evaporator 1 through the "blower rotational speed" input from the blower rotational speed detecting means 60.

The blower rotational speed detection means is composed of a blower voltage sensor 62 for sensing the applied voltage of the blower 5, the blower voltage sensor 62 configured in this way, by detecting the voltage of the blower 5, the blower 5 Detect the rotation speed of).

The controller 40, when the "blower rotational speed" is input from the blower rotational speed detection means 60, the input "blower rotational speed" is compared with the "blower control rotational speed" of the normal conditions by automatic control or manual control It is determined whether the reduction is greater than or equal to a preset "first reference ratio." For example, it is determined whether the reduction is 70% or more compared to the "blower control rotation speed" of the normal condition.

As a result of the determination, if the "blower rotational speed" of the blower rotational speed detection means 60 is reduced to 70% or more compared with the "blower control rotational speed" of a normal condition, the control part 40 will be made to the surface of the evaporator 1, "Icing" is generated to generate a ventilation resistance, and it is determined that the rotational speed of the blower 5 is reduced because of the generated ventilation resistance.

When the determination is made, the control section 40 cuts off the compressor 3 of the air conditioner while entering the "icing prevention mode". Therefore, the refrigerant supplied to the evaporator 1 is blocked to prevent the icing phenomenon of the evaporator 1 at its source.

Here, the control unit 40 has a built-in program for calculating the "blower rotational speed" of the blower rotational speed detection means 60 as a ratio (%) value with respect to the "blower control rotational speed" of a normal condition. Of course.

In addition, the controller 40 variously stores the "blower control rotation speed" values of the normal condition by the automatic control or the manual control. In particular, it stores variously by "air discharge mode" and "by opening position of the temp door 70".

Therefore, when the controller 40 determines whether or not the icing occurs in the evaporator 1, the "blower" of the normal condition corresponding to the current "air discharge mode" and "opening position of the temp door 70" is determined. After detecting the control rotational speed, the "blower control rotational speed" of the detected normal condition and the "blower rotational speed" of the blower rotational speed detecting means 60 are compared and processed, and the "icing occurrence" of the evaporator 1 is determined. Is configured to determine.

On the other hand, as in the first embodiment described above, the control unit 40 controls each of the mode doors 10, 12, 14 to the "floor mode" when entering the "icing prevention mode", and the blower 5 Raise the number of revolutions to "standard number".

Moreover, the control part 40 continuously compares the "blower rotational speed" of the blower rotational speed detection means 60, and the "blower control rotational speed" of a normal condition after entering into the "icing prevention mode."

At this time, when the "blower rotational speed" ratio of the blower rotational speed detecting means 60 to the "blower control rotational speed" of the normal condition is raised to the "second reference ratio" higher than the "first reference ratio", For example, when rising to 90% or more, the controller 40 determines that the "icing" of the evaporator 1 has been removed and the rotational speed of the blower 5 has been restored to its normal state.

When the determination is made, the controller 40 is released from the "icing prevention mode", and the controller 40 released from the "icing prevention mode" includes the compressor 3 of the air conditioner and each of the mode doors 10, 12, and 14. And the blower 5 to the original state.

Next, an operation example of the third embodiment having such a configuration will be described with reference to FIGS. 7 and 8.

First, in a state in which the air conditioner is turned on (S301), it is determined whether the current rotational speed of the blower 5 is reduced to "first reference ratio" or more compared to the "blower control rotational speed" of the normal condition ( S303). For example, it is determined whether the reduction is 70% or more compared to the "blower control rotation speed" of the normal condition.

If the determination result is reduced to 70% or more, the controller 40 determines that the rotational speed of the blower 5 is reduced due to the "icing" of the evaporator 1, and enters the "icing prevention mode" (S305). .

Then, the control unit 40 entering the "icing prevention mode" cuts off the compressor 3 of the air conditioner, controls the respective mode doors 10, 12, and 14 in the "floor mode", and rotates the blower 5. The number of stages is raised to the "standard stage" (S307).

Then, while the refrigerant supplied to the evaporator 1 is blocked, the "icing phenomenon" of the evaporator 1 is prevented. And hot and humid air passing through the evaporator (1) is discharged to the bottom surface of the vehicle interior to improve the comfort in the vehicle interior. And as the air volume of the air blown to the evaporator 1 side increases, the icing of the evaporator 1 is removed quickly.

On the other hand, the control unit 40 displays the entry of the "icing prevention mode" on the display unit 50 of the controller after the entry of the "icing prevention mode" (S307). The user then knows that the "icing" of the evaporator 1 is currently being processed.

7 and 8 again, the controller 40 enters the "icing prevention mode", and the "blower rotation speed" of the blower rotation speed detecting means 60 is "blower control rotation" under normal conditions. It is determined again whether it has risen above the "second reference ratio" relative to the "speed" (S309). For example, it is judged whether it has risen more than 90% compared with the "blower control rotation speed" of a normal condition.

As a result of the determination, if it has risen to 90% or more, the controller 40 determines that the rotational speed of the blower 5 has been restored to its normal state by removing the "icing" of the evaporator 1 and releasing it from the "icing prevention mode". It becomes (S311).

The controller 40 released from the icing prevention mode resets the compressor 3 of the air conditioner, the mode doors 10, 12, 14, the blower 5, and the display unit 50 of the controller to their original state. It returns to (S313). The air conditioner then operates normally again.

According to the present invention of the third embodiment having such a configuration, the "icing" of the evaporator 1 is sensed in consideration of the rotational speed of the blower 5 which reacts sensitively depending on whether the "icing" of the evaporator 1 occurs. As a result, the "accuracy determination accuracy" of the evaporator 1 can be significantly increased.

In addition, since the "icing occurrence discrimination accuracy" of the evaporator 1 can be significantly increased, the "icing generation" of the evaporator 1 can be quickly responded, thereby quickly "icinging" the evaporator 1. Can be removed

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: evaporator 3: compressor
5: Blower 10, 12, 14: Mode Door
20: icing prevention device 30: icing occurrence determination means
32: first evaporator temperature sensor 34: second evaporator temperature sensor
40: control unit 50: display unit
60: blower rotational speed detection means 62: voltage sensor
70: Temp.Door

Claims (21)

delete delete delete Blower 5 for sucking inside and outside air and blowing it into the cabin, the evaporator 1 for cooling the air blown into the cabin with the refrigerant supplied from the compressor 3, and the discharge direction of the air blown into the cabin In the vehicle air conditioner comprising a plurality of mode doors (10, 12, 14) for adjusting the, and the temp door 70 for adjusting the temperature of the air blown into the vehicle cabin,
Icing generation determining means (30) for determining whether or not icing has occurred on the surface of the evaporator (1);
When it is determined that the icing of the evaporator 1 is generated by the icing occurrence determining means 30, the compressor 3 is cut off and supplied to the evaporator 1 while entering the icing prevention mode. Control unit 40 to block the refrigerant to be discharged, and to control the mode door (10, 12, 14) in the floor mode (Floor Mode) to discharge the air passing through the evaporator 1 to the bottom surface of the vehicle interior Including,
The control unit 40,
Upon entering the icing prevention mode, the number of rotation stages of the blower 5 is increased to a predetermined reference stage, thereby increasing the amount of air blown to the evaporator 1 side,
The icing occurrence determination means 30,
In order to detect the temperature of the air passing through the lower left and right portions of the lower portion of the evaporator 1, the intervals are respectively provided on the downstream portions of the evaporator 1 corresponding to the left and right sides of the lower portion of the evaporator 1. First and second evaporator sensors 32 and 34 spaced apart from each other;
Icing on the evaporator 1 when the temperature deviation between the left and right downstream air temperatures input from the first and second evaporator temperature sensors 32 and 34 is equal to or greater than a preset reference temperature deviation. Vehicle control unit comprising the control unit 40 to determine that the generated. Blower 5 for sucking inside and outside air and blowing it into the cabin, the evaporator 1 for cooling the air blown into the cabin with the refrigerant supplied from the compressor 3, and the discharge direction of the air blown into the cabin In the vehicle air conditioner comprising a plurality of mode doors (10, 12, 14) for adjusting the, and the temp door 70 for adjusting the temperature of the air blown into the vehicle cabin,
Icing generation determining means (30) for determining whether or not icing has occurred on the surface of the evaporator (1);
When it is determined that the icing of the evaporator 1 is generated by the icing occurrence determining means 30, the compressor 3 is cut off and supplied to the evaporator 1 while entering the icing prevention mode. Control unit 40 to block the refrigerant to be discharged, and to control the mode door (10, 12, 14) in the floor mode (Floor Mode) to discharge the air passing through the evaporator 1 to the bottom surface of the vehicle interior Including,
The control unit 40,
Upon entering the icing prevention mode, the number of rotation stages of the blower 5 is increased to a predetermined reference stage, thereby increasing the amount of air blown to the evaporator 1 side,
The icing occurrence determination means 30,
Installed at intervals downstream of the evaporator 1 corresponding to the upper and lower sides of the evaporator 1 so as to sense the temperature of the air passing through the upper and lower sides of the evaporator 1, respectively. First and second evaporator sensors (32, 34);
Icing the evaporator 1 when the temperature deviation between the upper and lower air temperatures of the evaporator 1 input from the first and second evaporator temperature sensors 32 and 34 is equal to or greater than a preset reference temperature deviation. Vehicle control unit comprising the control unit 40 to determine that the generated. The method of claim 5,
The control unit 40,
Among the air temperatures upstream and downstream of the evaporator 1 input from the first and second evaporator temperature sensors 32 and 34, the air temperature passing through the lower part of the evaporator 1 is the evaporator. A vehicle air conditioner, characterized in that it is determined that icing has occurred in the evaporator (1) when the reference temperature deviation is higher than the air temperature passing through the upper portion of (1). delete The method of claim 4, wherein
A reference temperature deviation for determining whether or not an icing of the evaporator (1) is compared with the temperature deviation between the left and right downstream air temperatures of the evaporator (1), the vehicle air conditioner, characterized in that 6 ℃. The method according to any one of claims 4 to 6,
The control unit 40,
Even if it is determined that icing is generated in the evaporator 1, only when at least one of the air temperatures input by the first and second evaporator temperature sensors 32 and 34 is lower than a preset first reference temperature, Vehicle air conditioner, characterized in that to enter the icing prevention mode. The method according to claim 5 or 6,
The control unit 40,
When the temperature deviation between the air temperatures upstream and downstream of the evaporator 1 and the reference temperature deviation are compared to determine whether icing of the evaporator 1 occurs,
Even if it is determined that the icing is generated in the evaporator 1, the vehicle is characterized in that entering the icing prevention mode only when the air temperature passing through the upper portion of the evaporator 1 is less than the first reference temperature. Air conditioning system. The method of claim 9,
The control unit 40,
After entering the icing prevention mode, when all of the air temperatures input from the first and second evaporator temperature sensors 32 and 34 are above a second reference temperature higher than the first reference temperature, the icing prevention mode Vehicle air conditioner, characterized in that for returning the compressor (3), each mode door (10, 12, 14) and blower (5) to its original state. The method of claim 11,
The first reference temperature embedded in the control unit 40 is 3 ℃, the second reference temperature is a vehicle air conditioning apparatus, characterized in that 10 ℃. The method of claim 11,
The control unit 40,
When entering and releasing the icing prevention mode, the vehicle air conditioner, characterized in that the entry and release of the icing prevention mode on the display unit (50) of the controller for controlling the air conditioner in a specific character, symbol or picture. Blower 5 for sucking inside and outside air and blowing it into the cabin, the evaporator 1 for cooling the air blown into the cabin with the refrigerant supplied from the compressor 3, and the discharge direction of the air blown into the cabin In the vehicle air conditioner comprising a plurality of mode doors (10, 12, 14) for adjusting the, and the temp door 70 for adjusting the temperature of the air blown into the vehicle cabin,
Icing generation determining means (30) for determining whether or not icing has occurred on the surface of the evaporator (1);
When it is determined that the icing of the evaporator 1 is generated by the icing occurrence determining means 30, the compressor 3 is cut off and supplied to the evaporator 1 while entering the icing prevention mode. Control unit 40 to block the refrigerant to be discharged, and to control the mode door (10, 12, 14) in the floor mode (Floor Mode) to discharge the air passing through the evaporator 1 to the bottom surface of the vehicle interior Including,
The control unit 40,
Upon entering the icing prevention mode, the number of rotation stages of the blower 5 is increased to a predetermined reference stage, thereby increasing the amount of air blown to the evaporator 1 side,
The icing occurrence determination means 30,
Blower rotational speed detecting means (60) for detecting a rotational speed of the blower (5);
The current rotational speed of the blower 5 input from the blower rotational speed detecting means 60 is equal to or greater than the preset first reference ratio relative to the rotational speed of the blower 5 under normal conditions by automatic control or manual control. And a control unit (40) for discriminating that icing has occurred in the evaporator (1) when it is reduced. The method of claim 14,
The control unit 40,
By the air control mode by the automatic control or manual control and by the opening position of the temper door 70, the rotational speed values of the blower (5) of the normal conditions are variously stored,
In determining whether the evaporator 1 has an icing, the rotational speed of the blower 5 in the normal condition corresponding to the current air discharge mode and the opening position of the temporal door 70 is detected, and then the detected normal condition is detected. Comparing the rotational speed of the blower (5) and the rotational speed of the blower (5) input from the blower rotational speed detecting means 60 to determine whether or not the icing of the evaporator (1) . The method of claim 15,
The control unit 40,
After entering the icing prevention mode, the ratio of the rotational speed of the blower 5 of the blower rotational speed detecting means 60 to the rotational speed of the blower 5 in the normal condition is higher than the first reference ratio. When raised above, the vehicle air conditioner, which is released from the icing prevention mode and returns the compressor (3), each of the mode doors (10, 12, 14) and the blower (5) to their original state. The method of claim 16,
The first reference ratio built in the control unit 40 is 70%, the second reference ratio is a vehicle air conditioning apparatus, characterized in that 90%. The method of claim 16,
The control unit 40,
When entering and releasing the icing prevention mode, the vehicle air conditioner, characterized in that the entry and release of the icing prevention mode on the display unit (50) of the controller for controlling the air conditioner in a specific character, symbol or picture. The method according to any one of claims 14 to 18,
The blower rotational speed detecting means 60,
When the icing of the evaporator 1 occurs, by detecting the voltage of the blower (5) which is changed according to the reduction of the rotational speed of the blower (5) due to the increased ventilation resistance, the rotational speed of the blower (5) is sensed Vehicle air conditioner, characterized in that the blower voltage sensor (62).

The method according to any one of claims 4, 5 and 14,
The control unit 40,
When the number of rotations of the blower 5 before entering the icing prevention mode is greater than or equal to the reference number, the number of rotations of the blower 5 before entering the icing prevention mode is maintained as it is when the icing prevention mode is entered. Vehicle air conditioning system. The method of claim 5,
A reference temperature deviation for determining whether or not an icing of the evaporator (1) is compared with the temperature deviation between the air temperature of the upper, lower downstream of the evaporator (1) is a vehicle air conditioner.

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