JP2015193284A - Air conditioning device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device for a vehicle capable of maintaining cooling feeling which is common sensation and saving power.SOLUTION: An air conditioning device for a vehicle comprises a refrigeration cycle having a compressor and an evaporator, and change of an on-state and off-state of the compressor is performed depending on temperature of the evaporator. The air conditioning device for a vehicle comprises: outside air temperature detection means; solar radiation amount detection means; stop determination means for determining change of an on-state and off-state of the compressor after start-up of the compressor 1; and a counter for counting a determination number of the on-state and off-state determined by the stop determination means. When the compressor 1 becomes the off-state after start-up, and detection temperature of the outside air temperature detection means is equal to or more than first regulation temperature and equal to or less than second regulation temperature, and the detected solar radiation amount of the solar radiation amount detection is equal to or less than a regulation amount, when a count value of the counter reaches a predetermined regulation count number determined by the outside air temperature, temperature of the evaporator for turning the compressor to the on-state is made higher than temperature of the evaporator in count.

Description

  The present invention relates to an air conditioning apparatus for a vehicle that adjusts an air temperature supplied to a vehicle interior by on / off controlling a compressor of a refrigeration cycle.

  A conventional vehicle air conditioner of this type includes a refrigeration cycle that includes a compressor that compresses a refrigerant, and an evaporator that cools the air by exchanging heat between the refrigerant and air sent into the passenger compartment. Is turned on and off by the temperature of the air that has passed through the evaporator (for example, see Patent Document 1). The temperature of the evaporator that turns the compressor on and off is conventionally constant. When the temperature of the air that has passed through the evaporator reaches the off temperature, the compressor is turned off. After that, when the temperature of the air that has passed through the evaporator rises to the on temperature, the compressor is turned on. By repeatedly turning on and off such a compressor, conditioned air having a temperature in a predetermined range is supplied to the passenger compartment.

JP-A 64-22616

  However, the cooling feeling as the occupant's experience varies depending on the external environment where the occupant is placed. Therefore, depending on the external environment, it may be felt that the cooling is strong. In such a case, it is useless to leave the compressor on. On the other hand, regardless of the external environment in which the occupant is placed, if the on-temperature of the compressor is simply set high, the cooling feeling as a bodily sensation may be impaired.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a vehicle air conditioner that can save power while maintaining a cooling feeling as a bodily sensation.

  The present invention includes a refrigeration cycle having a compressor that compresses a refrigerant, and an evaporator that cools the air by exchanging heat between the refrigerant and air that is sent into a passenger compartment, and the evaporator is turned on and off. An air conditioner for a vehicle that operates according to a temperature of the outside, an outside air temperature detecting means for detecting the outside air temperature, a solar radiation amount detecting means for detecting the amount of solar radiation, and after the start of the compressor, the on / off change of the compressor And a counter that counts the number of on / off determinations made by the stop determination unit. The compressor shifts to an off state after startup, and the detected temperature of the outside air temperature detection unit is a first temperature. When the temperature is not less than a specified temperature and not more than a second specified temperature, and the amount of solar radiation detected by the solar radiation amount detecting means is not more than a specified amount, When the on / off number of the compressor counted by the counter reaches a specified count number determined by the value of the outside air temperature, the temperature of the evaporator for turning on the compressor is set to a temperature higher than the temperature of the evaporator during counting. This is an air conditioner for a vehicle characterized in that it is set to

  The specified count number is preferably set to a larger value as the outside air temperature is higher.

  According to the present invention, when the evaporator is cooled, the outside air temperature is not so high, and the amount of solar radiation is not large, when it can be determined that the evaporator has a sufficient cooling capacity, the temperature of the air cooled by the evaporator is increased. Temperature. In such a situation, even if the air temperature of the air conditioning is high, the passenger can obtain a cooling feeling as a bodily sensation. Further, by increasing the compressor ON temperature, the compressor OFF time becomes longer. As described above, it is possible to save power while maintaining a cooling feeling as a bodily sensation.

1 shows an embodiment of the present invention and is a configuration diagram of a vehicle air conditioner. FIG. FIG. 6 is a control flowchart of the first half of the control device during cooling operation according to the embodiment of the present invention. FIG. 6 is a control flowchart of the latter half of the control device in the cooling operation according to the embodiment of the present invention. It is a characteristic diagram of each change state of the temperature of the Eva temperature sensor for illustrating an embodiment of the present invention and explaining an image felt by a passenger for cooling. FIG. 5 is a diagram illustrating an embodiment of the present invention and illustrating temperature characteristics of an evaporator temperature sensor and an off / off operation of a compressor when an evaporator is sufficiently cooled.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the vehicle air conditioner includes a refrigeration cycle S and a control device 11 that controls the refrigeration cycle S.

  The refrigeration cycle S includes a compressor 1 that compresses gaseous refrigerant, a condenser 2 that cools high-temperature and high-pressure refrigerant from the compressor 1, an expansion valve 3 that decompresses refrigerant from the condenser 2, and a low-temperature and low-pressure refrigerant from the expansion valve 3. An evaporator 4 is provided for exchanging heat between the refrigerant and the air supplied to the passenger compartment to cool the air. The compressor 1 includes a compression mechanism (not shown) that compresses the refrigerant and a motor (not shown) that drives the compression mechanism. The motor is turned on / off by the control device 1.

  Detection data from an evaporator temperature sensor 5 that detects the temperature of the evaporator 4, a counter 6, a solar radiation amount detector 9, and an outside air temperature detector 10 is input to the controller 11. The evaporator temperature sensor 5 detects the temperature of the evaporator 4, that is, the temperature of the air that has passed through the evaporator 4 in this embodiment. The counter 6 counts the number of on / off determinations made by the stop determination means 7. The stop determination means 7 determines whether the compressor 1 is on or off (operation / stop) after the vehicle air conditioner is started. When the cooling operation having the normal control and the comp power saving control is selected, the control device 11 executes the control shown in FIGS. The details of this control will be described in the description of the operation. Hereinafter, the operation of the vehicle air conditioner will be described.

  As shown in FIG. 2, when the cooling operation having the normal control and the comp power saving control is selected, the solar radiation amount detected by the solar radiation amount detecting means 9, the outside air temperature detected by the outside air temperature detecting means 10, and the EVA temperature sensor 5 Each of the temperatures of the evaporator 4 detected by is taken in (step SA01, step SA02, step SA03).

  Here, the solar radiation amount, the outside air temperature, and the temperature of the evaporator 4 are respectively set with specified values for use in the following control. The prescribed amount of solar radiation is set to 400 W / m 2 in this embodiment. The first specified temperature of the outside air temperature is set to 20 ° C. in this embodiment, and the second specified temperature is set to 35 ° C. in this embodiment. The prescribed amount of solar radiation is an amount by which the occupant does not feel the warmth of the face due to solar radiation if it is less than that value. If the 2nd specified temperature of outside temperature is below that value, it is the quantity which a passenger does not feel the heat by outside temperature very much. The first specified temperature of the outside air temperature is a temperature at which window fogging due to outside air is a concern when the temperature is less than this value. This is to avoid shifting to the comp power saving control because window fogging occurs in the comp power saving control. The specified temperature of the evaporator 4 is set to 3 ° C. in this embodiment. This is because if the temperature of the air that has passed through the evaporator 4 is 3 ° C., it is determined that the evaporator 4 is sufficiently cooled (there is sufficient cooling capacity). As a result, it is detected that the compressor 1 has shifted to the off state after startup.

  In the case where correction is possible as described below, the prescribed value of the amount of solar radiation is set to 500 W / m 2. The first specified temperature of the outside air temperature is set to 15 ° C. in this embodiment, and the second specified temperature is set to 40 ° C. in this embodiment. This is to prevent control that frequently repeats the power saving control and normal control of the compressor.

  As shown in FIG. 3, it is determined whether or not correction is possible (correction of the on-temperature of the compressor 1) from the plurality of detection data described above, specifically, whether or not a precondition for comp power saving control is satisfied. (Step SA04). Whether or not correction is possible depends on whether the compressor 1 is turned off after startup, the detected temperature of the outside air temperature detecting means 10 is 20 ° C. or higher and 35 ° C. or lower, and the detected solar radiation amount of the solar radiation amount detecting means 9 Is determined by whether it is 400 W / m 2 or less. If it is determined that correction is impossible, normal control is performed (step SA14). In normal control, the compressor 1 is turned on / off at the temperature of the evaporator 4, that is, at an off temperature of 3 ° C. and an on temperature of 5 ° C.

  If it is determined that correction is possible, the count value is determined based on the value of the outside air temperature (SA06 to SA11). The specified count number is set larger as the outside air temperature is higher. Specifically, when the outside air temperature is between 15 ° C. and less than 20 ° C., the count value is “3”, and between 20 ° C. and less than 25 ° C., the count value is “4”, between 25 ° C. and less than 30 ° C. The count value is “6”, the count value is “8” between 30 ° C. and less than 35 ° C., and the count value is “10” between 35 ° C. and less than 40 ° C. The reason why the count value when the outside air temperature is less than 15 ° C. is not assigned is that the cooling operation is not performed when the outside air temperature is less than 15 ° C.

  Next, the count number of the counter 6 (the number of times the compressor 1 is turned on / off) is read (step SA12). Then, the count number of the counter 6 (the number of times the compressor 1 is turned on / off) is compared with the specified count number determined by the value of the outside air temperature (step SA13). Based on this comparison, it is determined whether or not the evaporator 4 has sufficient ability to cool. When the number of on / off operations of the compressor 1 has not reached the specified count determined by the value of the outside air temperature, normal control is performed (step SA14). When the on / off number of the compressor 1 has reached the specified count number determined by the value of the outside air temperature, it can be determined that the evaporator 4 has sufficient cooling capacity, and therefore the process proceeds to power saving control (step SA15). ). In the power saving control, the compressor 1 is turned on / off at the temperature of the evaporator 4, that is, at an off temperature of 3 ° C. and an on temperature of 15 ° C. That is, the temperature of the evaporator 4 that turns on (activates) the compressor 1 is set to be higher than the temperature of the evaporator 4 that is counting.

  Here, the reason why the above-described compressor power saving control is provided will be described. FIG. 4 is a characteristic diagram of each change state of the temperature of air passing through the evaporator 4 (detected temperature of the evaporator temperature sensor) for explaining an image felt by the occupant with respect to cooling. When the compressor 1 is driven and the temperature of the air passing through the evaporator 4 hardly decreases, the occupant feels hot due to insufficient cooling (d1 characteristic line). When the temperature of the air passing through the evaporator 4 gradually falls, the occupant feels a lack of cooling feeling although it is cold. The compressor 1 is not turned on / off (d2 characteristic line). When the temperature of the air passing through the evaporator 4 decreases smoothly, the occupant feels a cooling feeling (d3 characteristic line). The compressor 1 is turned on / off. When the temperature of the air passing through the evaporator 4 falls steeply, the passenger feels a sufficient cooling feeling (d4 characteristic line). When the temperature of the air passing through the evaporator 4 falls steeply, the compressor 1 is repeatedly turned on / off in a short span as shown in FIG. In such a situation, the evaporator 4 is sufficiently cooled (is capable of sufficiently cooling). Therefore, if there are not many external factors (outside temperature, amount of solar radiation) that impair the cooling feeling as a bodily sensation, the compressor 1 is turned on. Even if the temperature (temperature of the evaporator 4) is slightly increased, the cooling feeling as a bodily sensation can be maintained. In this way, the power saving control of the compressor is provided by utilizing the fact that the cooling feeling as a bodily sensation varies depending on external factors (outside temperature, solar radiation amount).

  As described above, the compressor 1 shifts to the off state after startup, and the detected temperature of the outside air temperature detecting means 10 is not less than the first specified temperature (20 ° C.) and not more than the second specified temperature (35 ° C.), In addition, when the amount of solar radiation detected by the solar radiation amount detecting means 9 is equal to or less than the prescribed amount (400 W / m 2), the on / off number of the compressor 1 counted by the counter 6 is set to the prescribed count number determined by the value of the outside air temperature. When the temperature reached, the temperature of the evaporator 4 for turning on the compressor 1 was set to a temperature (15 ° C.) higher than the temperature of the evaporator 4 being counted. Therefore, when the evaporator 4 is cooled (when the passing air can be cooled to almost the lowest cooling temperature), the outside air temperature is not so high, and the amount of solar radiation is not large, it is determined that the evaporator 4 has sufficient ability to cool. When possible, the temperature of the air cooled by the evaporator 4 becomes a high temperature. In such a situation, even if the temperature of the conditioned air is high, the occupant can obtain a cooling feeling as a bodily sensation. Then, the temperature of the evaporator 4 that turns on the compressor 1 is increased, so that the off time of the compressor 1 becomes longer. As described above, it is possible to save power while maintaining a cooling feeling as a bodily sensation. Further, when the outside air temperature is equal to or lower than the first specified temperature (20 ° C. in the above embodiment), the compressor power saving control is not entered, so that window fogging can be prevented.

  The specified count number is set larger as the outside air temperature is higher. That is, the higher the outside air temperature, the stricter the requirement for determining whether or not the evaporator 4 is capable of sufficiently cooling. As described above, the higher the situation in which it is difficult for the occupant to obtain a cooling feeling, the more severe the conditions for increasing the temperature of the evaporator 4 for turning on the compressor 1, and thus the cooling feeling as a feeling is saved as much as possible. Motorization can be achieved.

S Refrigeration cycle 1 Compressor 4 Evaporator 6 Counter 7 Stop determination means 9 Solar radiation amount detection means 10 Outside air temperature detection means

Claims (2)

A refrigeration cycle (S) having a compressor (1) for compressing the refrigerant and an evaporator (4) for cooling the air by exchanging heat between the refrigerant and the air sent into the passenger compartment; ) On and off according to the temperature of the evaporator (4),
After the start-up of the compressor (1), the on-off change of the compressor (1) is detected after the start of the compressor (1), the outside air temperature detecting means (10) for detecting the outside air temperature, the solar radiation amount detecting means (9) for detecting the amount of solar radiation. A stop determination means (7) for determining, and a counter (6) for counting the number of on / off determinations by the stop determination means (7),
The compressor (1) shifts to an off state after startup, the detected temperature of the outside air temperature detecting means (10) is not less than a first specified temperature and not more than a second specified temperature, and the solar radiation amount detecting means ( When the detected solar radiation amount of 9) is less than or equal to a predetermined amount, when the on / off number of the compressor (1) counted by the counter (6) reaches a predetermined count number determined by the value of the outside air temperature, The vehicle air conditioner characterized in that the temperature of the evaporator (4) for turning on the compressor (1) is set to be higher than the temperature of the evaporator (4) being counted. The vehicle air conditioner according to claim 1,
The vehicle air conditioner is characterized in that the specified count number is set to a larger value as the outside air temperature is higher.

Images