JP2006224825A - Air conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle making an occupant feel good without using a separate outside air sensor. <P>SOLUTION: The air conditioner 30 for the vehicle is provided with a temperature setting means 34 for setting a set temperature in a cabin of the vehicle 23; and a coolant pressure detection means 12 for detecting the pressure of the coolant flowing in a refrigeration cycle 20 for protecting a compressor 31 and has a constitution for controlling it so as to retain the inside of the cabin of the vehicle 23 to the set temperature. When the coolant pressure detection means 12 detects the pressure of the coolant of a first predetermined value R1 or less, since it is determined that the outside air temperature is a low temperature and the set temperature set by the temperature setting means 34 is corrected to a higher temperature, the occupant, feeling can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle air conditioner, and is particularly useful as an air conditioner for a construction machine vehicle or an agricultural machine vehicle.

  In recent years, a vehicle air conditioner is generally equipped with an air conditioner system, and various sensors are used in an auto air conditioner in particular. This is an important function in air conditioning control. On the other hand, in recent years, there has been an increasing demand for inexpensive vehicle air conditioners, and it is important to reduce the number of these sensors while ensuring good occupant feeling.

Therefore, conventionally, as this type of vehicle air conditioner, a sensor is provided on the wind of the refrigerant evaporator in the refrigeration cycle, and the detected value of the sensor in the outside air mode is replaced with the outside air temperature to control the air conditioning. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 7-179119 (see FIG. 1)

  However, in the conventional vehicle air conditioner described above, for the purpose of eliminating the outside air sensor, the detection value of the sensor provided on the wind of the refrigerant evaporator is replaced with the outside air temperature to control the air conditioning, but the room temperature is detected. In addition to the sensor for doing so, the sensor for detecting the outside air temperature is required.

  Therefore, an object of the present invention is to provide a vehicle air conditioner that improves the occupant's feeling without requiring a separate outside air sensor.

In order to achieve the above object, the technical means described in claims 1 to 4 are employed. That is, the invention of the vehicle air conditioner according to claim 1 includes a refrigeration cycle (20) including a temperature setting means (34) for setting the interior of the vehicle (23) to a desired temperature and a compressor (31). The refrigerant pressure detecting means (12) for detecting the pressure of the refrigerant in the vehicle and air-conditioning control so as to keep the cabin temperature at the set temperature, and the refrigeration according to the detected pressure of the refrigerant pressure detecting means (12) A vehicle air conditioner comprising a control means (13) for stopping the operation of the cycle (20),
The control means (13) determines that the outside air temperature is low when the pressure of the refrigerant whose detected pressure is equal to or lower than a first predetermined value (R1) is detected, and is air-conditioned into the vehicle interior. The blowout temperature is set higher than the blowout temperature which is controlled so as to keep the set temperature.

  According to the first aspect of the present invention, focusing on the fact that the refrigerant saturation pressure decreases when the outside air temperature is low, the detection of the outside air temperature by the refrigerant pressure detecting means for protecting the compressor is utilized. Thus, the vehicle air conditioner that improves the occupant's feeling is obtained by simply detecting the low outside air temperature and making the temperature of the air conditioning blown into the vehicle interior higher than the set temperature. In particular, when the present invention is applied to an air conditioner mounted on a vehicle for construction machinery, there is a high possibility that the outside air will be used under severe conditions of low temperature, and the window glass area is relatively large. Since the influence on the in-vehicle environment is large, the output of the heating can be increased more than the occupant himself considers such a situation, and the occupant's feeling can be improved.

According to a second aspect of the present invention, there is provided a vehicular air conditioner according to a second aspect of the present invention. The refrigerant pressure detecting means (12) for detecting the pressure of the refrigerant in the vehicle and air-conditioning control so as to keep the cabin temperature at the set temperature, and the refrigeration according to the detected pressure of the refrigerant pressure detecting means (12) A vehicle air conditioner comprising a control means (13) for stopping the operation of the cycle (20),
The control means (13), when detecting the pressure of the refrigerant whose detected pressure is equal to or lower than a first predetermined value (R1), determines that the outside air temperature is low and makes the set temperature higher. It is characterized by correction.

  According to the second aspect of the present invention, attention is paid to the fact that the refrigerant saturation pressure decreases when the outside air temperature is low, and the detection of the outside air temperature by the refrigerant pressure detecting means for protecting the compressor is utilized. Thus, the vehicle interior set temperature is corrected by simply detecting the low outside air temperature, so that the vehicle air conditioner that increases the heating output and improves the occupant's feeling can be obtained.

  According to a third aspect of the present invention, there is provided a mode of hot air blown out into the vehicle (23) after the refrigerant pressure detecting means (12) detects the pressure of the refrigerant below the first predetermined value (R1). , Foot mode, or bi-level mode.

  According to the third aspect of the present invention, the heating air blown into the vehicle compartment after the refrigerant pressure detecting means detects the refrigerant pressure equal to or lower than the first predetermined value is comfortable for the passenger. can do.

  The invention according to claim 4 is a case where when the air conditioner switch of the vehicle air conditioner is turned on, the vehicle has not been operated for a predetermined time (T) or longer before the power is turned on, and When the refrigerant pressure detecting means (12) detects the pressure of the refrigerant equal to or higher than a second predetermined value (R2), it is determined that the outside air temperature is high and the set temperature is corrected to a lower temperature. It is characterized by.

  According to the invention described in claim 4, the feeling of the occupant can be improved not only in the heating mode during heating but also during cooling.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Below, 1st Embodiment is described using FIGS. 1-4. FIG. 1 is a schematic diagram showing a configuration of a vehicle air conditioner in the present embodiment. FIG. 2 is a schematic side view illustrating an internal configuration of a vehicle on which the vehicle air conditioner according to the present embodiment is mounted. FIG. 3 is a block diagram relating to the control system of the vehicle air conditioner in the present embodiment. FIG. 4 is a flowchart showing a control flow of the vehicle air conditioner in the present embodiment.

  The vehicle air conditioner 30 of the present invention is used for a vehicle for private use or business use, and particularly FIG. 2 shows a case where it is used as an air conditioner for a construction machine vehicle or an agricultural machine vehicle as an example. It is.

  The main components of the vehicle air conditioner 30 according to the present embodiment are an air conditioning duct 1 that introduces air into the vehicle 23, a blower 3 that sends air into the air conditioning duct 1, a refrigeration cycle 20, a hot water circuit 22, and This is an air conditioner control device 13.

  The air conditioning duct 1 includes branch ducts 1a and 1b at its downstream end, the branch duct 1a communicates with the outlets 17a and 17b that open into the vehicle 23 room, and the branch duct 1b opens into the vehicle 23 room. It communicates with the outlet 18. The air outlet 17a is opened at the front part in the vehicle 23 room, and the air outlet 17b is opened upward from the rear part in the vehicle 23 room.

  In the face mode, the face mode outlet stream 24 is blown out from the outlet 17a at the front of the vehicle 23 toward the upper body of the occupant and upward from the outlet 17b at the rear of the vehicle 23. A foot mode blowing flow 25 is blown out from the outlet 18 toward the passenger's feet, and in the bi-level mode, the face mode blowing flow 24 and the foot mode blowing flow 25 are blown out simultaneously. The mode can be switched.

  The blower 3 includes a motor 3a, a centrifugal fan 3b, and a casing 3c. An inside / outside air intake switching box 2 is provided on the upstream side of the casing 3c. The inside / outside air intake switching box 2 is provided with an air inside the vehicle compartment 23, that is, an inside air inlet 26 for taking in the inside air, and an outside of the vehicle compartment 23. The outside air intake port 29 for taking in air, that is, outside air is formed. In addition, inside / outside air intake switching box 2 is provided with inside / outside air switching damper 16 capable of selectively opening and closing inside air inlet 26 and outside air inlet 29. When the inside air temperature inside the vehicle 23 is measured by the inside air sensor 9, the inside / outside air switching damper 16 is opened so as to be positioned on the outside air intake port 29 side, thereby blocking the outside air from entering.

  The refrigeration cycle 20 functions as a cooling means, and is a compressor 31 that is driven by the traveling engine 38 of the vehicle 23 via the electromagnetic clutch 7, and a refrigerant that condenses and liquefies the high-temperature and high-pressure refrigerant compressed by the compressor 31. A condenser 32, a receiver 4 that temporarily stores the refrigerant condensed in the refrigerant condenser 32 and flows only the liquid refrigerant, an expansion valve 5 that decompresses and expands the liquid refrigerant led from the receiver 4, and the air conditioning duct 1 The refrigerant evaporator 6 is provided between the receiver 4 and the expansion valve 5 and detects the pressure of the refrigerant. The refrigerant evaporator 6 is configured to receive and evaporate the low-temperature and low-pressure refrigerant decompressed by the expansion valve 5. The refrigerant pressure detector 12 is a pressure detection means, and is connected to each other through a refrigerant pipe 19. Among the components constituting the refrigeration cycle 20, the electromagnetic clutch 7, the compressor 31, the refrigerant condenser 32, the receiver 4, the refrigerant pressure detector 12, and the traveling engine 38 are located outside the vehicle 23. Has been placed.

  The electromagnetic clutch 7 that operates the compressor 31 is ON / OFF controlled based on an ON / OFF signal output from the air conditioner control device 13.

  The heating cycle 22 is provided on the downstream side of the refrigerant evaporator 6 in the air conditioning duct 1. The heater core 8 heats the air flowing in the air conditioning duct 1 using the cooling water of the traveling engine 38 as a heat source, and travels through the heater core 8. The engine 38 includes a cooling water circuit (not shown) and a hot water pipe 21 connected in an annular shape. An air mix damper 14 that adjusts the ratio of the amount of air that passes through the heater core 8 and the amount of air that bypasses the heater core 8 is disposed downstream of the refrigerant evaporator 6 and upstream of the heater core 8.

  The air conditioner control device 13 has a built-in microcomputer (not shown) in which a control program related to air conditioning control, an arithmetic expression, and the like are stored, and as shown in FIG. Based on the signals output from the inside air sensor 9, the solar radiation sensor 11, the post-evaporator sensor 10, the refrigerant pressure detector 12 as the refrigerant pressure detecting means, and the engine water temperature sensor 33, the electromagnetic clutch 7, the outlet switching damper 15a. 15b, the inside / outside air switching damper 16, the air mix damper 14, and the motor 3a. The air conditioner operation panel 35 is provided with a temperature setting volume 34 that is a temperature setting means for an occupant to set the room temperature, and a display unit 36 that displays the set temperature and air volume.

  The post-evaporator sensor 10 is provided for the function of preventing frost formation. When the cooling capacity is larger than the cooling load, the refrigerant evaporation pressure is lowered, the surface temperature of the refrigerant evaporator 6 is 0 ° C. or less, the freezing of condensed water proceeds and the flow of the passing air is prevented, and the evaporation pressure further decreases. This means that the air will stop flowing. In order to prevent such a state, the function which controls the cooling capability of the refrigerating cycle 20 and prevents frost formation is required. As a method for providing this function, the air temperature downstream of the refrigerant evaporator 6 is measured by the post-evaporator sensor 10, and when the temperature reaches 4 ° C., for example, the power of the electromagnetic clutch 7 is turned off and the temperature rises to 5 ° C. Control to turn on the power.

  The refrigerant pressure detector 12 functions as a safety switch for protecting the refrigeration cycle 20. The refrigerant pressure detector 12 is provided outside the vehicle 23 room between the high pressure side receiver 4 and the expansion valve 5, detects the high pressure side pressure of the refrigeration cycle 20, stops the compressor 31, and sets the refrigeration cycle 20. It functions to prevent the breakdown of the equipment that constitutes it. The refrigerant pressure detector 12 detects an abnormally high pressure in the refrigeration cycle 20, turns off the electromagnetic clutch 7 to stop the compressor 31, and also detects an abnormal low pressure in the refrigeration cycle 20 to turn on the electromagnetic clutch 7. It cuts and stops the compressor 31. When an abnormal low pressure is detected, the air conditioner is turned off, or the refrigerant is insufficient or completely absent due to gas leakage or the like. If the compressor 31 is continuously operated in this state, the compressor 31 is burned. There is a fear. As the refrigerant pressure detector 12, a dual type that detects abnormally low pressure and abnormally high pressure with one switch, a type that detects each independently, and a triple type that also incorporates an electric fan control pressure detector are used. be able to.

  In the present invention, focusing on the fact that the refrigerant saturation pressure decreases when the outside air temperature is low, the threshold value of the pressure detected by the refrigerant pressure detector 12 is set at the first predetermined value R1, and this first predetermined value is set. When the refrigerant pressure equal to or lower than R1 is detected, it is determined that the outside air temperature is low. Then, the occupant corrects the set temperature higher than the set temperature set by the temperature setting volume 34 (for example, plus 2 ° C.), or sets the air-conditioning blowout temperature blown into the vehicle interior by the temperature setting volume 34. By making it higher than the blowing temperature at the set temperature, the output of the heating when the outside air is at a low temperature can be increased to improve the occupant's feeling.

  Next, the operation of the vehicle air conditioner 30 of the present invention will be described based on the processing procedure of the air conditioner control device 13 shown in FIG.

  First, when the vehicle air conditioner 30 is turned on by the passenger, the control flow starts. The set temperature signal output by operating the temperature setting volume 34, the inside air sensor 9, the solar radiation sensor 11, and the post-evaporator sensor 10 are displayed. Each signal output from the engine water temperature sensor 33 is input to the air conditioner control device 13 (step S400).

  Next, the refrigerant pressure of the refrigeration cycle 20 is detected by the refrigerant pressure detector 12, and it is determined whether or not the detected value is equal to or less than a first predetermined value R1 (step S405). When it is determined that the detected value is equal to or less than the first predetermined value R1, it is determined that the outside air temperature is low, and a positive correction is made to a set temperature higher than the set temperature set by the temperature setting volume 34 ( For example, plus 2 ° C.) (step S410), the power of the electromagnetic clutch 7 is turned off, and the compressor 31 is stopped (step S420). Steps S410 and S420 may be a flow that is executed almost simultaneously after it is determined that the value detected by the refrigerant pressure detector 12 in step S405 is equal to or less than the first predetermined value R1. Further, when the outside air temperature rises and the refrigerant pressure is no longer abnormally low, the compressor 31 stopped in step S420 is turned on by returning the electromagnetic clutch 7 to the activated state.

  The set temperature set by the temperature setting volume 34 is stored in the storage means 13a built in the air conditioner control device 13, and the stored data is corrected to a plus and updated to a new set temperature. The air conditioner control device 13 performs calculation.

  The first predetermined value R1 is a value that can be individually set in the refrigerant pressure detector 12, and improves the occupant's feeling according to the vehicle type in which the vehicle air conditioner 30 is used and the usage environment. It is a threshold that can be variably set in order to fulfill.

  Next, the air conditioner control device 13 performs calculation using the positively corrected set temperature signal and various signals input in step S400 (step S430), but the compressor 31 is stopped in step 420. Therefore, step 435 is not executed here.

  In order to adjust the temperature of the air blown into the vehicle 23 room, the opening degree of the air mix damper 14 that determines the amount of air to be heated is controlled (step S440), and the above-described positive-corrected set temperature signal and the signal input in step S400. Using the various signals, the opening / closing of the outlet switching dampers 15a and 15b is controlled so as to obtain an appropriate blowing mode for the passenger's feeling (step S445). In step S445, after the refrigerant pressure detector 12 detects a low refrigerant pressure equal to or lower than the first predetermined value R1 as described above, the blowing mode of the warm air sent into the vehicle 23 room is the foot mode or the bilevel. The face mode is prohibited by adopting the mode. As a result, the hot air is prevented from directly hitting the vicinity of the occupant's face and is brought close to the head cold foot heat state.

  Further, when ventilation is necessary, when humidity adjustment is necessary, or when the cooling load is large, the inside / outside air switching damper 16 is controlled to switch between the outside air mode and the inside air mode (step S450), and an appropriate air flow rate is obtained. In order to ensure the above, the input to the motor 3a that drives the blower 3 is controlled (step S455), and the process returns to the start again.

  In the flow for performing the positive correction of the set temperature via steps S410 and S420 described so far, the amount of air flowing through the heater core 8 by the hot water circuit 22 is always adjusted in steps S440 and S455 by circulating a constant amount of hot water. By doing so, the heating output is adjusted.

When it is determined in step S405 that the detected value of the refrigerant pressure by the refrigerant pressure detector 12 is larger than the first predetermined value R1, the correction of the set temperature executed in step S410 is canceled (step In step S425), the electromagnetic clutch 7 is turned on to start the compressor 31. Subsequently, steps S430 to S455 are executed, and the air conditioning control is performed so as to keep the in-vehicle temperature at the set temperature returned to the original.

  As described above, according to the present embodiment, when the refrigerant pressure detector 12 serving as the refrigerant pressure detecting means detects the pressure of the refrigerant equal to or lower than the first predetermined value R1, it is determined that the outside air temperature is low, and Since the blowout temperature of the air conditioning blown into the passenger compartment is higher than the blowout temperature that is controlled so as to be maintained at the set temperature set by the temperature setting means 34, the refrigerant pressure detection means for protecting the compressor By utilizing the detection of outside air temperature, the air conditioning temperature blown out into the passenger compartment can be detected more easily and the occupant's feeling can be improved. Can do.

  Further, when the refrigerant pressure detector 12 as the refrigerant pressure detection means detects the pressure of the refrigerant equal to or lower than the first predetermined value R1, it is determined that the outside air temperature is low and the setting set by the temperature setting means 34. Since the temperature is corrected to a higher temperature, when the outside air temperature is low, paying attention to the fact that the refrigerant saturation pressure decreases, the outside air temperature by the refrigerant pressure detector 12 for protecting the compressor 31. By utilizing the detection of the vehicle, it is possible to easily detect the low outside air temperature without the need for a separate outside air sensor, and to improve the occupant's feeling by increasing the heating output from the initial setting by the occupant. be able to.

  When the vehicle air conditioner 30 according to the present invention is used in a construction machine vehicle, it is used in a cold region in winter, and because of the low heat insulation of the vehicle, the vehicle air conditioner 30 is exposed to the interior environment due to cold radiant heat. Since the influence is great, the heating output can be increased more than the occupant himself considers such a unique situation, and the occupant's feeling can be improved.

  Moreover, since the blowing mode of the warm air sent out into the vehicle 23 room after the refrigerant pressure detector 12 detects the refrigerant pressure equal to or lower than the first predetermined value R1 is set to the foot mode or the bi-level mode, Heating air blowing that operates earlier than the initial setting by the occupant can be made comfortable for the driver.

(Second Embodiment)
Hereinafter, in the second embodiment, in addition to the control described in the first embodiment, when the refrigerant pressure detector 12 detects the pressure of the refrigerant equal to or higher than the second predetermined value R2, the initial set by the occupant is set. In this embodiment, the air conditioning control is performed so that the cooling output is larger than the initial setting by the occupant during cooling, by correcting the set temperature to a lower temperature. FIG. 5 is a flowchart showing a control flow of the vehicle air conditioner in the present embodiment.

  First, when the air conditioner switch of the vehicle air conditioner 30 is turned on by an occupant, the control flow starts. In step S500, the vehicle air conditioner 30 is operated before the air conditioner switch of the vehicle air conditioner 30 is turned on. It is determined whether or not the vehicle has been stopped for a predetermined time T or longer. The predetermined time T is a set time for detecting the refrigerant pressure according to the outside air temperature by detecting the refrigerant pressure in a state where the refrigerant pressure of the refrigeration cycle 20 is stable. As an example, it is determined whether or not the operation has been stopped for one hour or more.

  In this case, the air conditioner control device 13 is always supplied with power so that a minimum function such as a clock can be operated even when the air conditioner switch is OFF. In the present embodiment, the operation stop time from when the most recent air conditioner switch is turned off to when the air conditioner switch is turned on this time can be measured.

  When it is determined that the operation of the vehicle air conditioner 30 has not been stopped for a predetermined time T or longer, the process jumps to step S535, executes S535 and later, and does not correct the set temperature. On the other hand, when it is determined that the operation has been stopped for the predetermined time T or longer, step S505 is executed.

  In step S505, the set temperature signal output by operating the temperature setting volume 34 and the signals output from the inside air sensor 9, the solar radiation sensor 11, the post-evaporator sensor 10, and the engine water temperature sensor 33 are transmitted to the air conditioner control device 13. Is input.

  Next, the refrigerant pressure detector 12 detects the refrigerant pressure of the refrigeration cycle 20, and determines whether or not the detected value is equal to or less than a first predetermined value R1 (step S510). When the detected value is equal to or less than the first predetermined value R1, it is determined that the outside air temperature is low, and a positive correction is made to a set temperature higher than the set temperature set by the temperature setting volume 34 (for example, plus 2). (Step S515), and the electromagnetic clutch 7 is turned off to stop the compressor 31 (step S520). Steps S515 and S520 may be a flow that is executed almost simultaneously after it is determined that the value detected by the refrigerant pressure detector 12 in step S510 is equal to or less than the first predetermined value R1. Further, when the outside air temperature rises and the refrigerant pressure is no longer abnormally low, the compressor 31 stopped in step S520 is turned on by the electromagnetic clutch 7 being turned on. The first predetermined value R1 is a value that can be individually set in the refrigerant pressure detector 12, and improves the occupant's feeling according to the vehicle type in which the vehicle air conditioner 30 is used and the usage environment. It is a threshold that can be variably set in order to fulfill.

  Next, the air conditioner control device 13 performs calculation using the positively corrected set temperature signal and various signals input in step S505 (step S535), but the compressor 31 is stopped in step 520. Therefore, step 540 is not executed here. Next, in order to adjust the temperature of the air blown into the vehicle 23, the opening degree of the air mix damper 14 that determines the heating air flow rate is controlled (step S545). The opening / closing of the outlet switching dampers 15a and 15b is controlled using the various signals input at step S550 so that a blowing mode suitable for the occupant's feeling is obtained (step S550). As described above, the hot air blowing mode sent into the vehicle 23 after the refrigerant pressure detector 12 detects a low refrigerant pressure equal to or lower than the first predetermined value R1 is the foot mode or the face mode as the bi-level mode. It is forbidden.

  Further, when ventilation is necessary, when humidity adjustment is necessary, or when the cooling load is large, the inside / outside air switching damper 16 is controlled to switch between the outside air mode and the inside air mode (step S555), and an appropriate air flow rate is obtained. In order to ensure the above, the input to the motor 3a that drives the blower 3 is controlled (step S560), the process returns to the start again, and the control flow from step S500 is executed.

  On the other hand, if the detected value of the refrigerant pressure detector 12 is larger than the first predetermined value R1 in step S510, the process proceeds to step S525, and whether or not the detected value is equal to or greater than the second predetermined value R2. Judging. When it is determined that the detected value is smaller than the second predetermined value R2, the process proceeds to step S530, where the set temperature corrected in step S515 is canceled and returned to the original set temperature. Then, step S535 and subsequent steps are executed.

  On the other hand, if it is determined that the detected value is equal to or higher than the second predetermined value R2, it is determined that the outside air temperature is high, and the set temperature lower than the set temperature set by the temperature setting volume 34 is negative. Correction (for example, minus 2 ° C.) is performed (step S565). At this time, the compressor 31 is not stopped.

  The second predetermined value R2 is a value that can be individually set in the refrigerant pressure detector 12, and improves the feeling of the occupant according to the vehicle type in which the vehicle air conditioner 30 is used and the usage environment. It is a threshold that can be variably set in order to fulfill. In this way, in step S565, the output of the cooling mode that operates after this becomes larger than the mode set by the occupant.

  As described above, according to the present embodiment, when the air conditioner switch of the vehicle air conditioner 30 is turned on by the occupant, the vehicle air conditioner 30 stops the operation for the predetermined time T or longer before the power is turned on. If the refrigerant pressure detector 12 detects the refrigerant pressure equal to or higher than the second predetermined value R2, the set temperature set by the temperature setting volume 34 is corrected to a lower temperature. Therefore, the feeling of the occupant can be improved not only in the heating mode during heating but also during cooling.

It is a schematic diagram which shows the structure of the vehicle air conditioner in 1st Embodiment. It is a side surface schematic diagram which shows the structure inside the vehicle by which the vehicle air conditioner in 1st Embodiment is mounted. It is a block diagram in connection with the control system of the vehicle air conditioner in 1st Embodiment. It is the flowchart which showed the control flow of the vehicle air conditioner in 1st Embodiment. It is the flowchart which showed the control flow of the vehicle air conditioner in 2nd Embodiment.

Explanation of symbols

12 Refrigerant pressure detector (refrigerant pressure detection means)
13 Air Conditioning Control Device 20 Refrigeration Cycle 23 Vehicle 30 Vehicle Air Conditioning Device 31 Compressor 34 Temperature Setting Volume (Temperature Setting Means)

Claims (4)

A temperature setting means (34) for setting the interior of the vehicle (23) to a desired temperature; a refrigerant pressure detection means (12) for detecting the pressure of the refrigerant in the refrigeration cycle (20) including the compressor (31); And control means (13) for controlling the air conditioning so as to keep the passenger compartment temperature at the set temperature and for stopping the operation of the refrigeration cycle (20) in accordance with the detected pressure of the refrigerant pressure detecting means (12). A vehicle air conditioner comprising:
The control means (13) determines that the outside air temperature is low when the pressure of the refrigerant whose detected pressure is equal to or lower than a first predetermined value (R1) is detected, and is air-conditioned into the vehicle interior. The air conditioner for vehicles is characterized by making it higher than the blowing temperature controlled so that it may maintain at the said setting temperature. A temperature setting means (34) for setting the interior of the vehicle (23) to a desired temperature; a refrigerant pressure detection means (12) for detecting the pressure of the refrigerant in the refrigeration cycle (20) including the compressor (31); And control means (13) for controlling the air conditioning so as to keep the passenger compartment temperature at the set temperature and for stopping the operation of the refrigeration cycle (20) in accordance with the detected pressure of the refrigerant pressure detecting means (12). A vehicle air conditioner comprising:
The control means (13), when detecting the pressure of the refrigerant whose detected pressure is equal to or lower than a first predetermined value (R1), determines that the outside air temperature is low and makes the set temperature higher. A vehicular air conditioner that is corrected.   The hot air blowing mode sent into the vehicle (23) after the refrigerant pressure detecting means (12) detects the refrigerant pressure equal to or lower than the first predetermined value (R1) is a foot mode or a bi-level mode. The vehicular air conditioner according to claim 1 or 2.   When the air conditioner switch of the vehicle air conditioner is turned on, the refrigerant pressure detecting means (12) is not operated for a predetermined time (T) before the power is turned on, and the refrigerant pressure detecting means (12) 3. When the pressure of the refrigerant equal to or higher than a second predetermined value (R2) is detected, it is determined that the outside air temperature is high, and the set temperature is corrected to a lower temperature. The vehicle air conditioner described in 1.

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