JP2009126218A - Vehicular air conditioning control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an occupant from feeling unpleasant due to switching to an inside-air mode, in a vehicular air conditioning control device that detects outdoor air contamination and changes an intake door into the inside-air mode. <P>SOLUTION: The vehicular air conditioning control device is provided with a control unit 2 that controls drive of a refrigerating cycle 50 including a cooler 5, operation of an intake door 13, operation of blow-out port doors 15a, 15b, and 15c, and operation of an air conditioning unit 1 including operation of a blower fan 4, and also executes contaminated outdoor air intrusion prevention processing for preventing intrusion of contaminated outdoor air by switching the intake door 13 into an inside-air mode when an outdoor air contamination sensor 32 detects outdoor air contamination. The control unit 2 executes dehumidification operation processing for allowing the refrigerating cycle 50 to execute dehumidification operation when the control unit executes the contaminated outdoor air intrusion prevention processing. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle air-conditioning control device, and in particular, when detecting outside air pollution due to exhaust gas or the like, a process for switching to the inside air mode and blocking the intake of outside air into the passenger compartment to prevent entry of contaminated outside air. The present invention relates to a vehicle air conditioning control device to be executed.

Conventionally, an intake door that switches between an outside air mode for taking in outside air and an inside air mode for taking in inside air is provided at an intake port of an in-vehicle air conditioning unit.
Then, in the vehicle air conditioning control apparatus that controls the operation of the air conditioning unit including the switching of the intake door, the dirt of the outside air is detected, and when the contamination of the outside air is detected, the intake door is switched to the inside air mode. Japanese Patent Application Laid-Open No. H10-228561 is known that prevents outside air contaminated with the air from entering the passenger compartment.
JP 2000-142079 A

However, in the above-described conventional technology, when the air conditioning unit is switched to the inside air mode, although it is possible to prevent the passenger from feeling uncomfortable due to the entry of contaminated outside air, the following problem newly arises. There was a risk of discomfort.
When the mode is switched to the inside air mode, the noise generated in the air conditioning unit is confined in the vehicle and the noise increases. In addition, the humidity in the passenger compartment increases, and the windows tend to become cloudy.
In addition, if the intake door is in the outside air mode when the outside air contamination is detected, a command to set the inside air mode is output from the outside air detection, the intake door actuator is driven, and the intake door is actually set to the inside air mode. Since it takes time to become, contaminated outside air may be taken into the air conditioning unit. In this case, when the blowing mode of the air conditioning unit is, for example, a vent mode in which air is blown toward the upper body of the occupant, the contaminated outside air is blown out toward the occupant, which may cause discomfort.

  The present invention has been made paying attention to the above-mentioned conventional problems, and in a vehicle air-conditioning control apparatus that detects outside air contamination and sets the intake door to the inside air mode, the occupant is switched to the inside air mode. The purpose is to prevent discomfort.

  In order to achieve the above-described object, the invention according to claim 1 is an air-conditioning unit having an air passage extending from an intake port capable of taking in outside air and vehicle compartment air to a plurality of air outlets on the vehicle compartment side. The air conditioner unit is provided with a fan that forms air flow in the air passage and a cooler that can cool the air in the air passage, and the outside air mode that takes in outside air from the vehicle is cut off from the outside of the vehicle. An intake door capable of forming an inside air mode for taking in the passenger compartment air, a blowout door capable of switching a blowout mode to the plurality of blowout ports, an outside air contamination detection device for detecting dirt in outside air, and the cooling Control of the operation of the air conditioning unit including the driving of the refrigeration cycle including the cooler, the operation of the intake door, the operation of the outlet door, and the operation of the fan, and when the outside air contamination detection device detects the outside air contamination A control device that executes a contaminated outside air intrusion prevention process for switching the intake door to the inside air mode to prevent entry of contaminated outside air, and the control device performs the refrigeration cycle during the execution of the contaminated outside air intrusion prevention process. The vehicle air conditioner is characterized by executing a dehumidifying operation process for dehumidifying operation.

  According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect of the present invention, an outside air temperature sensor that detects an outside air temperature is provided on the input side of the control device, and the control device controls the outside air temperature. Based on the preset outside air temperature determination value, when the outside air temperature is lower than the outside air temperature determination value, it is determined that the necessity for dehumidification is high, and the outside air temperature is higher than the outside air temperature determination value In the case of the inside air mode based on the intake door mode, when it is determined that the necessity for dehumidification is high in the dehumidification necessity determination process for determining that the necessity for dehumidification is low In the case of the outside air mode, on the other hand, in the outside air mode, the dehumidifying operation start judging process for judging that the dehumidifying operation is not started, and the outside air temperature detection at the time of detecting outside air pollution of the outside air pollution detecting device. Was the decision value selecting process of changing the pollution-time determination value that is set larger than the normal-time value for use during non-ambient air pollution detection, the vehicle air conditioning control apparatus, characterized by the execution.

  In order to achieve the above-mentioned object, the invention according to claim 3 is an air conditioner having an air passage from an intake port capable of taking in outside air and passenger compartment air to a plurality of outlets on the passenger compartment side. A unit, a fan that is provided in the air conditioning unit and that blows air in the air passage, a cooler that can cool the air in the air passage, and an outside air mode that takes in outside air and the outside of the vehicle are arranged at the intake port. An intake door capable of forming an internal air mode that shuts off and takes in the passenger compartment air, an air outlet door capable of switching the air outlet mode to the plurality of air outlets, an outside air contamination detection device that detects dirt in the outside air, and Control of the operation of the air conditioning unit including the driving of the refrigeration cycle including the cooler, the operation of the intake door, the operation of the outlet door, the operation of the fan, and the outside air contamination detection of the outside air contamination detection device A control device for executing a contaminated outside air intrusion preventing process for switching the intake door to an inside air mode to prevent the entry of contaminated outside air, and the control device performs the contamination outside air intrusion preventing process when the fan is The air conditioning control device for a vehicle is characterized in that the air-conditioning control device for the inside air mode switching is executed to reduce the amount of air blown by the air flow and to change the air blowing mode to the foot mode in which air is blown from the foot of the passenger compartment.

  According to a fourth aspect of the present invention, in the vehicle air conditioning control device according to the third aspect, the control device is preset with a reduced blown air volume after the execution of the inside air mode switching corresponding process. The air volume return process for returning to the original air volume after the lapse of the set reduction time and the state of switching to the foot mode are restored to the original blow-out mode after it is determined that the intake door has reached the inside air mode. The vehicle air-conditioning control device is characterized by executing door return processing.

In the vehicle air-conditioning control apparatus according to claim 1, when detecting outside air pollution, the control apparatus executes a contaminated outside air intrusion preventing process, and switches the intake door of the air conditioning unit to the inside air mode to prevent entry of contaminated outside air. In addition, the refrigeration cycle is dehumidified to dehumidify the circulated room air.
Therefore, when the intake door is automatically set to the inside air mode without being recognized by the occupant by detecting contaminated outside air, the window is prevented from being fogged without any occupant operation. It can prevent giving pleasure.

Furthermore, in the invention according to claim 2, when the outside air pollution is detected, the outside air temperature judgment value is changed to the pollution time judgment value set higher than the normal value. For this reason, in the dehumidification necessity determination process, it is determined that dehumidification is necessary even at an outside temperature that is not normally determined as dehumidifying operation. In the process, it is determined that the dehumidifying operation is started by determining that the necessity for dehumidification is high and determining the inside air mode.
As described above, in the invention according to claim 2, by using the existing device for performing the dehumidifying operation determination process, the dehumidification necessity determination value is changed based on the detection result of the outside air contamination, so that when the outside air contamination is detected. Therefore, dehumidification can be performed, and the product can be commercialized at low cost as compared with the case where a whole system is newly constructed.

The air conditioning control device for a vehicle according to claim 3 reduces the amount of air blown out by the fan when executing the contaminated outside air intrusion preventing process for switching the intake door to the inside air mode to prevent the entry of the contaminated outside air when the outside air contamination is detected. At the same time, the inside air mode switching corresponding process is executed in which the blowing mode is a foot mode in which the blowing is performed from the foot of the passenger compartment.
Therefore, when the inside air mode is set in the contaminated outside air intrusion prevention processing, the operating sound of the air conditioning unit tends to be trapped inside the room and the noise tends to increase, but the generation of noise can be suppressed due to the decrease in the amount of blown air, The discomfort given to the passenger can be suppressed.
Furthermore, since the blowout mode is set to the foot mode, the blower outlet to the passenger compartment can be kept away from the occupant, compared to the vent mode that directs the airflow to the occupant and the differential mode that directs the airflow to the window. Even when contaminated outside air enters the air conditioning unit due to a delay or the like, the odor can be kept away and the discomfort given to the occupant can be reduced.

  Further, in the invention according to claim 4, since the blowing air volume and the blowing mode are returned to the original state by the air volume returning process and the door returning process, it is possible to prevent the deterioration of the cabin temperature environment due to the air volume reduction, Moreover, it is possible to prevent the passenger from feeling uncomfortable due to the different blowing modes.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The vehicle air-conditioning control apparatus according to this embodiment has an air passage (from an intake port (11) capable of taking in outside air and vehicle compartment air to a plurality of air outlets (12a, 12b, 12c) on the vehicle compartment side ( 18), an air conditioning unit (1), and a fan (4) that is provided in the air conditioning unit (1) and that blows air to the air passage (18) and can cool the air in the air passage (18). A cooler (5), an intake door (13) disposed at the intake port (11) and capable of forming an outside air mode for taking in outside air and an inside air mode for shutting off the outside of the vehicle and taking in cabin air; and The air outlet doors (15a, 15b, 15c) capable of switching the air outlet modes of the air outlets (12a, 12b, 12c), the outside air contamination detection device (32) for detecting dirt in the outside air, and the cooler ( 5) refrigeration cycle (5) ), Operation of the intake door (13), operation of the outlet doors (12a, 12b, 12c), operation of the air conditioning unit (1) including operation of the fan (4), and A control device (2) for executing a contaminated outside air intrusion prevention process for switching the intake door (13) to an inside air mode to prevent entry of contaminated outside air when the outside air contamination detecting device (32) detects outside air contamination. The control device (2) is a vehicle air conditioner that performs a dehumidifying operation process for dehumidifying the refrigeration cycle (50) when the contaminated outside air intrusion preventing process is performed.

Below, based on FIGS. 1-4, the vehicle air-conditioning control apparatus A of Example 1 of the best embodiment of this invention is demonstrated.
FIG. 1 is an overall schematic diagram showing an outline of the configuration of a vehicle air conditioning control device A. The vehicle air conditioning control device A includes an air conditioning unit 1, a control unit (control device) 2, and a sensor group 3. Yes.

  The air-conditioning unit 1 is installed in an instrument panel (not shown), and a differential outlet 12a to which various ducts (not shown) connected to the vehicle interior are connected from an inlet 11 capable of selectively taking inside and outside air. , A unit case 1c having an air passage 18 extending to the foot outlet 12b and the vent outlet 12c.

  In the air passage 18 of the unit case 1c, the blower fan 4 that forms the air flow from the intake port 11 to each of the air outlets 12a to 12c, the cooler 5 that cools the air flow, and the air flow are heated in order from the air blowing upstream side. And a heater 6 to be installed.

  The cooler 5 is one of components of a refrigeration cycle 50 that circulates a known refrigerant. The known refrigeration cycle 50 includes a compressor 51 that is driven by a traveling engine (not shown) or a motor to compress the refrigerant, a condenser 52 that cools the high-pressure gaseous refrigerant to a saturated liquid, An expansion valve 53 that uses low-temperature and low-pressure steam as a refrigerant, a liquid tank 54 that performs gas-liquid separation of the refrigerant, and a refrigerant adjustment valve 55 that adjusts the flow rate of the refrigerant to the cooler 5 are provided.

The unit case 1c is provided with an intake door 13, an air mix door 14, a differential door (air outlet door) 15a, a foot door (air outlet door) 15b, and a vent door (air outlet door) 15c.
The intake door 13 is attached to the intake port 11 and is closed to the outside air mode in which only the outside air outside the vehicle is taken in with the passenger compartment side fully closed. It is possible to switch to a shy mode to take in. It is also possible to include an intermediate mode for taking in the inside air and outside air in the outside air mode.

  The air mix door 14 adjusts the air temperature from the air conditioning unit 1 by changing the opening degree to adjust the mixing ratio of the cool air that has passed through the cooler 5 and the warm air that has passed through the heater 6. It is a door that makes it possible.

  The differential door 15a, the foot door 15b, and the vent door 15c door are doors for opening and closing the differential air outlet 12a, the foot air outlet 12b, and the vent air outlet 12c, respectively. , The differential mode with the differential outlet 12a opened, the vent mode with the vent outlet 12c open, the foot mode with the foot outlet 12b open, and the bi-level mode with the vent outlet 12c and the foot outlet 12b open.

The sensor group 3 includes an operation switch 31, an outside air pollution sensor (outside air pollution detection device) 32, an inside air temperature sensor 33, an outside air temperature sensor 34, a solar radiation sensor 35, a water temperature sensor 36, a vehicle speed sensor 37, and an intake door. The position of the intake door 13 output from the actuator 17, that is, an intake door signal its signal indicating either the outside air mode or the inside air mode is included.
The operation switch 31 includes a plurality of switches such as a switch for setting the passenger compartment temperature and the amount of blown air and a switch for selecting the air intake mode and the blowout mode.
The outside air pollution sensor 32 is a sensor that is attached to the front end of the vehicle and detects the degree of outside air pollution by outputting a voltage signal corresponding to the gas concentration by utilizing the change in resistance value due to the presence of gas. is there.
As is well known, the inside air temperature sensor 33 is a sensor that detects the temperature inside the vehicle interior, the outside air temperature sensor 34 is a sensor that detects the outside temperature of the vehicle, the solar radiation sensor 35 is a sensor that detects the amount of solar radiation, and a water temperature sensor 36. Is a sensor that detects the engine coolant temperature, and the vehicle speed sensor 37 is a sensor that detects the traveling speed of the vehicle.

  The control unit 2 controls the operation of the air conditioning unit 1 based on the input from the sensor group 3 and executes normal air conditioning control processing, contaminated outside air entry prevention processing, inside air mode switching response processing, and dehumidification operation processing.

  The normal air conditioning control process is performed based on a preset control program based on a preset temperature and air volume set by operating the operation switch 31 by an occupant and an input from the sensor group 3. This is the control that optimally adjusts the blowing air volume, blowing mode, etc. Note that this normal air conditioning control process is well-known control and is not intended to be the gist of the present application, and thus detailed description thereof is omitted.

  The contaminated outside air intrusion prevention processing is performed when the intake door 13 is in a mode other than the inside air mode at the time of contamination detection when the output of the outside air pollution sensor 32 exceeds the contamination judgment value to prevent the entry of contaminated outside air. Processing to be included.

In the dehumidifying operation process, when the outside air temperature is lower than the set temperature and the intake door 13 is in a mode other than the outside air mode, when the determination condition that the window is likely to be cloudy is satisfied, the refrigeration cycle 50 is strengthened. This is a control for preventing the fogging of the window by dehumidifying operation.
The inside air mode switching response processing is processing executed in response to switching to the inside air mode by the contaminated outside air intrusion prevention processing.

  Next, details of the contaminated outside air intrusion prevention process, the dehumidifying operation process, and the inside air mode switching support process will be described with reference to the flowchart of FIG. Note that the process shown in FIG. 2 is executed by the normal control process while the compressor 51 is driven.

In step S1, it is determined whether or not the output of the outside air pollution sensor 32 has exceeded a preset pollution judgment value. If no outside air pollution is detected, the process proceeds to step S2 to determine the outside air temperature used in step S4. The normal first outside air temperature determination value Cs1 and the normal second outside air temperature determination value Cs2 are set as the values C1 and C2. In the first embodiment, the outside air temperature determination values C1 and C2 are provided with hysteresis using two values having different sizes.
On the other hand, when the outside air pollution is detected when the output of the outside air pollution sensor 32 exceeds the preset pollution judgment, the process proceeds to step S3 and the outside temperature judgment values C1 and C2 used in step S4 are used as the first outside for pollution time. An air temperature determination value CL1 and a contamination second external air temperature determination value CL2 are set.
Each threshold has a relationship of Cs1 <Cs2 <CL1 <CL2, and is set to, for example, about Cs1 = 15 ° C., Cs2 = 35 ° C., CL1 = 55 ° C., and CL2 = 70 ° C.

  In step S4, a dehumidification necessity determination process is performed to determine the degree of necessity of dehumidification based on the outside air temperature. That is, fogging of the window is likely to occur when the outside air temperature is low. Therefore, the lower the outside air temperature, the higher the necessity for dehumidification. Therefore, in this dehumidification necessity determination process, the outside air temperature determination values C1 and C2 are set, and when the outside air temperature is higher than the outside air temperature determination values C1 and C2, it is determined that the degree of dehumidification is high, and the outside air temperature determination value When it is lower than C1 and C2, it is determined that the degree of dehumidification is low.

In step S5 that proceeds when it is determined that the degree of dehumidification is low, it is determined whether or not the blowing mode is controlled to the defogging def mode. If the def mode is selected, the process proceeds to step S12 and a mode other than the def mode is selected. In step S6, the dehumidifying operation is canceled and the compressor 51 is operated weakly.
In the case of a weak operation of the compressor 51, the operation of the compressor 51 is performed by restricting the opening of the refrigerant adjustment valve 55 that adjusts the refrigerant flow rate and suppressing the refrigerant flow rate.

  On the other hand, if it is determined in step S4 that the degree of dehumidification is high, the process proceeds to step S7, and the contaminated outside air entry prevention process, the internal air mode switching corresponding process, and the dehumidifying operation start determination process in step S7 and subsequent steps are executed.

  In step S7, a contamination degree determination process is performed based on the output of the outside air contamination sensor 32. In this step S7, when it is determined that the output of the outside air pollution sensor 32 is higher than the preset pollution judgment value and the degree of pollution is high, the process proceeds to step S8 and the intake door 13 is set to the inside air mode to contaminate the outside air. Contaminated outside air intrusion prevention processing is executed to prevent the entry of air. On the other hand, when it is determined that the degree of contamination is low, the process proceeds to a dehumidifying operation start determination process in step S11. In the first embodiment, the contamination determination value used in step S7 is the same value as the contamination determination value used in step S1, but a different value may be used.

In step S9 and step S10 subsequent to step S8, an internal air mode switching response process for reducing noise and odor is performed in response to switching to the internal air mode.
Specifically, in step S9, a blowing mode switching process is performed in which the blowing mode formed by the doors 15a to 15c is the foot mode. In this foot mode, of the doors 15a, 15b and 15c, only the foot door 15b is opened, and the differential door 15a and the vent door 15c are closed.
Note that the blowout mode switched to the foot mode by the blowout mode switching process is performed when the intake door 13 is determined to have reached the inside air mode based on the intake door signal its, and the door return process is executed. The doors 15a to 15c are returned to the original blowing mode.

In the next step S <b> 10, an air volume reduction process is performed to output to the blower fan 4 to reduce the air volume. The air volume reduction amount varies depending on the current air volume.
That is, FIG. 3 is a flowchart showing the air volume reduction processing. First, in step S101, the current air volume is read and the air volume is stored as the control air volume SW.
In the next step S102, the current air volume is detected, and if the current air volume is the strongest, the process proceeds to step S103 and is reduced by 10%. On the other hand, if the current air volume is medium or strong, the process proceeds to step S104 and is reduced by 6%. If the current air volume is medium, the process proceeds to step S105 and is reduced by 3%. When the current air volume is less than medium, the air volume reduction is canceled and the current air volume is maintained.

  In addition, with the start of execution of this air volume reduction process, counting of the air volume return process is started. This air volume return process is a process of returning to the original air volume after a preset reduction time has elapsed.

This air volume return process will be briefly described with reference to the flowchart of FIG.
In step S111, it is determined whether or not the elapsed time Tn from the start of the air volume reduction process in steps S103 to S105 has reached a preset set time Ts. In the first embodiment, the set time Ts is set to about 1 to 3 minutes.
When the elapsed time Tn reaches the set time Ts, the process proceeds to step S112, and processing for increasing the 1% air volume is executed for each set time Ts2.
In the next step S113, it is determined whether or not the current air volume has reached the control air volume SW read in step 101. If not, the process in step S112 is repeated, and when the air volume reaches the control air volume SW, the air volume is reached. The return process ends.

  Returning to the flowchart of FIG. 2, in step S11, a dehumidifying operation start determination process is executed. This start determination process of the dehumidifying operation is determined by the intake mode of the intake door 13, and if the intake door 13 is in the inside air mode, it is determined that the dehumidifying operation is started, and the process proceeds to step S12 to start the dehumidifying operation process. On the other hand, if the intake door 13 is outside air mode, it will progress to step S5.

  In the dehumidifying operation process in step S12, the strong dehumidifying operation of the compressor 51 is executed. In the strong dehumidifying operation, the refrigerant adjustment valve 55 that adjusts the refrigerant flow rate described above is opened to increase the refrigerant flow rate.

Next, the operation according to the situation of the embodiment will be specifically described.
(When outside air is not polluted)
In the outside air non-contaminated state where the output of the outside air pollution sensor 32 is less than the pollution judgment value, the normal first outside air temperature judgment value Cs1, the normal first air temperature judgment value C1, C2 are used as the outside air temperature judgment values C1, C2 based on the processing of steps S1 → S2. 2 The outside air temperature determination value Cs2 is selected.
In this case, in the dehumidification necessity determination in step S4, when the outside air temperature is higher than both the determination values Cs1 and Cs2, in detail, when the temperature is rising, the outside air temperature is higher than the normal second outside air temperature determination value Cs2. When the temperature is low, it is determined that the degree of dehumidification is low when the temperature is lower than the normal first outside air temperature determination value Cs1. Therefore, except when the occupant has selected the differential mode, the dehumidification control cancellation process is executed (steps S4 → S5 → S6), and the compressor 51, that is, the refrigeration cycle 50 is operated in the mode selected in the normal control process. Is done.
If the occupant has selected the differential mode, the dehumidifying process is executed (step S5 → S12), and the compressor 51, that is, the refrigeration cycle 50 is operated in a strong dehumidifying operation.

  On the other hand, when the outside air temperature is lower than both the determination values Cs1 and Cs2 (specifically, when the outside air temperature is lower than the normal second outside air temperature determination value Cs2 when the temperature rises, when the temperature falls, If it is lower than the normal first outside air temperature determination value Cs1, the dehumidification necessity determination in step S4 determines that the dehumidification necessity is high, and the process proceeds to step S7 to execute the contamination degree determination process.

When the degree of outside air contamination is low, a dehumidifying operation start determination process based on the intake mode of the intake door 13 in step S11 is executed.
Therefore, if the intake door 13 is in the outside air mode, the window is less likely to be fogged, so the dehumidifying operation canceling process is executed except for the differential mode (steps S11 → S5 → S6).
On the other hand, when the intake door 13 is in the inside air mode, there is a high possibility that the window will be fogged, so the dehumidifying operation process is executed, and the compressor 51, that is, the refrigeration cycle 50 is strongly dehumidified (step S11 → S12).

  As described above, when the outside air is not contaminated with exhaust gas or the like, it is determined whether or not the compressor 51 is to be subjected to a strong dehumidifying operation based on the outside air temperature and the intake mode of the intake door 13. That is, when the outside air temperature is low and the intake door 13 is in the inside air mode, strong dehumidification operation is performed to prevent the windows from being fogged.

(When outside air is polluted)
In an outside air pollution state in which the output of the outside air pollution sensor 32 exceeds the pollution judgment value, the first outside air temperature judgment value CL1, for pollution time, is used as the outside air temperature judgment value C1, C2 based on the processing from step S1 to S2. The second outside air temperature determination value CL2 is selected.
The first outside air temperature determination value CL1 for pollution time and the second outside air temperature determination value CL2 for pollution time are set to be larger than the normal outside air temperature determination values Cs1 and Cs2, and in step S4, It is determined that the need for dehumidification is high even if the outside air temperature is high. Further, in step S7, it is determined that the contaminated outside air intrusion prevention process is started, the inside air mode is switched in step S8, and the inside air mode switching in steps S9 and S10 is further performed. Corresponding processing is executed.

In the inside air mode switching corresponding process, the blow mode is switched to the foot mode, and the air volume of the blower fan 4 is reduced when it is medium or higher.
After performing this inside air mode switching response processing, the strong dehumidifying operation of the compressor 51 is started.
Therefore, fogging of the window is prevented.

Moreover, when the intake door 13 is switched to the inside air mode to execute the strong dehumidifying operation, the noise of the air conditioning unit 1 becomes larger than the outside air mode, but the air volume is reduced by the processing corresponding to the inside air mode switching. The noise increase caused by switching to the inside air mode can be reduced. Therefore, it is possible to prevent the passenger from feeling uncomfortable due to the noise increase caused by switching to the inside air mode accompanying the start of the automatic dehumidifying operation.
In addition, after detecting the outside air contamination, the process of step S8 sets the inside air mode to prevent the entry of the contaminated outside air. Due to the drive response of the intake door 13, a certain amount of contaminated outside air enters the air conditioning unit 1 during that time. there's a possibility that. At this time, in the first embodiment, since the blowing mode is switched to the foot mode by the dehumidifying inside air mode switching support processing, the contaminated outside air that has entered the air conditioning unit 1 in this manner is close to the occupant such as the vent outlet 12b. Preventing air from being blown out from the air outlet, which can suppress discomfort to the occupant, and reduce the noise that increases due to switching to the inside air mode by moving the air outlet position away from the occupant. Can do.

Further, when the outside air pollution is detected, the inside air mode is set and the strong dehumidifying operation is started. In the first embodiment, the normal outside air temperature determination values Cs1 and Cs2 are used as the contamination outside air temperature determination values CL1 and CL2. A larger value is used. Thereby, in step S4, it is determined that the necessity for dehumidification is high regardless of the outside air temperature, and further, since the mode is switched to the inside air mode in step S8, the determination to proceed to step S12 is made in step S11, and strong A dehumidifying operation is performed.
Therefore, the part that executes the dehumidification necessity determination process in step S4 and the dehumidification operation start determination process in step S11 can use the same control circuit as a conventional product that does not execute such control. Design costs and manufacturing costs can be reduced compared to manufacturing a circuit that performs processing.

(After execution of contaminated outside air entry prevention process)
When the blowout mode is switched to the foot mode as a result of switching to the inside air mode by the execution of the contaminated outside air intrusion prevention process, and when the air volume of the blower fan 4 is medium or higher, it is reduced according to the air volume. The blowing mode and the air volume are returned to the original state.

When it is detected that the blowing mode is switched to the inside air mode based on the intake door signal it, the blowing mode is switched to the original blowing mode at that time.
In other words, when the contaminated outside air does not enter the air conditioning unit 1, the passenger is not likely to feel a strange odor due to the contaminated outside air, and therefore, the optimal blowing mode or the blowing mode set by the passenger is returned to the preferred blowing for control. The mode is returned to the blowing mode according to the request of the passenger or the passenger. Therefore, it is possible to suppress the deterioration of the air-conditioning environment and the feeling of discomfort to the occupant by switching the foot mode described above.

  Further, the reduced air volume is returned to the original air volume after a set time Ts of about 1 to 3 minutes has elapsed. Therefore, deterioration of the passenger compartment temperature environment can be prevented by reducing the air volume. In addition, when the air volume is restored, the original air volume is gradually restored, so that it is possible to prevent the occupant from feeling uncomfortable as compared with the case where the air volume is instantaneously restored.

  As mentioned above, although Embodiment and Example 1 of this invention were explained in full detail with reference to drawings, the concrete structure is not restricted to this Embodiment and Example 1, and does not deviate from the summary of this invention. A degree of design change is included in the present invention.

  For example, in the first embodiment, the combination of the process for executing the internal air mode switching corresponding process of steps S8 to S10 and the process of executing the strong dehumidification operation process when switching to the internal air mode at the time of detecting outside air contamination is combined. Although an example has been shown, even if at least one of the processes is executed, an intended purpose that does not give the passenger a sense of incongruity can be achieved.

  Further, in the first embodiment, an example in which the setting of the outside air temperature determination value is changed when the strong dehumidifying operation process is executed in accordance with the switching to the inside air mode at the time of detecting outside air contamination is limited to this. For example, when the outside air contamination is detected in step S1, the strong dehumidifying operation may be started. Further, in this case, the process may be advanced to the strong dehumidifying operation after executing the inside air mode switching corresponding process in steps S8 to S10.

  Further, in the first embodiment, after the air volume is reduced by the processing corresponding to the inside air mode switching, the original air volume is restored after the elapse of the set time Ts. However, the set time Ts is equal to the time shown in the first embodiment. It is not limited to and may be set arbitrarily. In addition, in the air flow return, in the first embodiment, an example in which the air flow is returned by 1% for each set time Ts2 is shown. However, the present invention is not limited to this, and other methods such as returning the air flow to the original air flow are possible. The embodiment may be used.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram showing a configuration of a vehicle air conditioning control device A according to Example 1 of the best mode of the present invention. It is a flowchart which shows the flow of the pollution external air approach prevention process by the vehicle air-conditioning control apparatus A of Example 1, a dehumidification driving | operation process, and an inside air mode switching corresponding | compatible process. It is a flowchart which shows the flow of the air volume reduction process by the vehicle air conditioner control apparatus A of Example 1. FIG. It is a flowchart which shows the flow of the air volume return process in the air-conditioning control apparatus A for vehicles of Example 1. FIG.

Explanation of symbols

1 Air conditioning unit 2 Control unit (control device)
4 Blower fan 5 Cooler 11 Inlet 12a Differential outlet 12b Foot outlet 12c Vent outlet 13 Intake door 15a Differential door (outlet door)
15b Foot door (air outlet door)
15c Vent door (air outlet door)
18 Air passage 32 Outside air pollution sensor 34 Outside air temperature sensor 50 Refrigeration cycle 51 Compressor 55 Refrigerant adjustment valve A Vehicle air conditioning control device

Claims (4)

An air conditioning unit having an air passage extending from an inlet capable of taking in outside air and passenger compartment air to a plurality of outlets on the passenger compartment side;
A cooler that is provided in the air conditioning unit and that can cool the air in the air passage and a fan that forms air in the air passage;
An intake door that is arranged at the intake and can form an outside air mode for taking in outside air and an inside air mode for taking in vehicle compartment air by blocking the outside of the vehicle;
An outlet door capable of switching an outlet mode of the plurality of outlets;
An outside air pollution detection device for detecting dirt on the outside air of the vehicle;
Control of the operation of the air conditioning unit including the driving of the refrigeration cycle including the cooler, the operation of the intake door, the operation of the outlet door, and the operation of the fan, and when the outside air contamination detection device detects the outside air contamination A control device for performing a contaminated outside air intrusion preventing process for switching the intake door to the inside air mode and preventing the entry of contaminated outside air;
With
The vehicle air conditioner, wherein the control device executes a dehumidifying operation process for dehumidifying the refrigeration cycle when the contaminated outside air intrusion preventing process is executed. An outside air temperature sensor for detecting an outside air temperature is provided on the input side of the control device;
The control device is
Based on the outside air temperature, on the basis of a preset outside air temperature determination value, when the outside air temperature is lower than the outside air temperature determination value, it is determined that the necessity for dehumidification is high, and the outside air temperature is higher than the outside air temperature determination value. A dehumidification necessity determination process for determining that the dehumidification necessity is low when the
In the dehumidifying necessity determination process, when it is determined that the dehumidifying necessity is high, it is further determined that the dehumidifying operation is started in the case of the inside air mode based on the intake door mode. In the case, the dehumidifying operation start determination process for determining that the dehumidifying operation is not started,
A determination value selection process for changing the outside air temperature determination value to a determination value for contamination set larger than a normal value used when detecting non-outdoor air contamination when detecting the outside air pollution of the outside air contamination detection device;
The vehicle air-conditioning control apparatus according to claim 1, wherein: An air conditioning unit having an air passage extending from an inlet capable of taking in outside air and passenger compartment air to a plurality of outlets on the passenger compartment side;
A cooler that is provided in the air conditioning unit and that can cool the air in the air passage and a fan that forms air in the air passage;
An intake door that is arranged at the intake and can form an outside air mode for taking in outside air and an inside air mode for taking in vehicle compartment air by blocking the outside of the vehicle;
An outlet door capable of switching an outlet mode of the plurality of outlets;
An outside air pollution detection device for detecting dirt on the outside air of the vehicle;
Control of the operation of the air conditioning unit including the driving of the refrigeration cycle including the cooler, the operation of the intake door, the operation of the outlet door, and the operation of the fan, and when the outside air contamination detection device detects the outside air contamination A control device for performing a contaminated outside air intrusion preventing process for switching the intake door to the inside air mode and preventing the entry of contaminated outside air;
With
When the control device performs the contaminated outside air intrusion prevention processing, the control device reduces the amount of air blown by the fan and executes an inside air mode switching corresponding processing in which the air blowing mode is a foot mode in which air is blown from the foot of the passenger compartment. A vehicle air-conditioning control device. The control device, after executing the inside air mode switching corresponding processing, air volume return processing for returning the reduced blown air volume to the original air volume after elapse of a preset set reduction time, and switching state to the foot mode The vehicle air-conditioning control apparatus according to claim 3, further comprising: a door return process for returning to the original blowing mode after a time point when the intake door is determined to have reached the inside air mode. .

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