JP2780061B2 - Air conditioning control device for vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle air-conditioning control device that performs air distribution control according to the state of solar radiation.

(Prior Art) For example, as disclosed in Japanese Patent Application Laid-Open No. 2-162115, the air volume supplied to the left and right sides of the vehicle compartment so that air blowing to both the left and right sides of the vehicle compartment is secured according to the direction of solar radiation. An air-conditioning control device for a vehicle is known, in which a wind distribution door for adjusting the ratio of the vehicle is driven and controlled in accordance with an output signal of a solar radiation detector.

(Problems to be Solved by the Invention) By the way, the conventional device that controls the air distribution ratio according to the solar radiation state simply controls the air distribution door so as to give a larger air volume to the solar radiation direction side. The main purpose is to improve the calorific imbalance state in the passenger compartment. Therefore, at the time of air distribution control, if the heat load of a specific portion in the vehicle interior becomes large due to solar radiation or the like, cool air is intensively supplied to that portion, and thus such a blowing state is continued for a long time. In addition, there is a problem that a part of the occupant's body is excessively cooled, and the feeling is worsened.

An object of the present invention is to provide a vehicle air-conditioning control device that avoids continuous local cooling for a long time when the air distribution ratio is controlled in a solar radiation state.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a method for adjusting an air distribution ratio at a plurality of air outlets into a vehicle compartment, as shown in the claim correspondence diagram of FIG. Air distribution ratio adjusting means 200,
Solar radiation detecting means 201 for detecting the amount of solar radiation at a plurality of locations in the vehicle, solar azimuth calculating means 202 for calculating the solar azimuth in response to the output of the solar irradiating detecting means 201; Control means 203 for controlling the air distribution ratio adjusting means 200 in order to obtain a required air distribution ratio in accordance with the calculated solar azimuth in response to the output, and a specific blowing wind direction for a predetermined time based on the output of the solar azimuth calculating means 202 Determining means 204 for determining whether or not air is continuously being blown; and, in response to the determining means 204, if the air is continuously blown to a specific blowing wind direction for a predetermined time or more, local cooling for that wind direction is avoided. And a local cooling avoiding means 205 for performing the operation.

As the local cooling avoidance means 205, a configuration for gradually increasing the blowout temperature, a configuration for correcting the air distribution ratio to return it to an equal value,
A configuration for pulsating the intensity of the blowing air or a configuration for pulsating the level of the blowing temperature can be used.

(Operation) The control means 203 controls the air distribution ratio adjusting means 200 according to the calculation result of the solar azimuth calculating means 202, and the air distribution ratio according to the solar azimuth at that time is set. As a result of the air distribution ratio control, when it is determined by the determining unit 204 that the air is continuously blown to the specific blowing wind direction for a predetermined time or longer, the operation for avoiding the local cooling is performed by the local cooling avoiding unit 205. Is done.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows an embodiment of an automotive air conditioner according to the present invention. This automotive air conditioner has an inside air inlet 2 and an outside air inlet 3 at the most upstream side of an air conditioning duct 1, and an inside / outside air switching door is provided at a portion where the inside air inlet 2 and the outside air inlet 3 are bifurcated. The inside / outside air switching door 4 allows the air to be introduced into the air conditioning duct 1 to be selected from inside air and outside air.

The blower 5 sucks air into the air-conditioning duct 1 and blows the air downstream, and an evaporator 6 and a heater core 7 are provided downstream of the blower 5. An air mix door 8 is provided in front of the heater core 7, and by adjusting the opening of the air mix door 8, the amount of air passing through the heater core 7 and the amount of air bypassing the heater core 7 can be changed. It has become.

The downstream side of the air-conditioning duct 1 is divided into a vent outlet 9, a lower outlet 10, and a defrost outlet 11 and opens into the vehicle interior. These outlets 9 to 11 are respectively connected to the vent door 12,
These doors are opened and closed by the foot door 13 and the differential door 14.
The desired blowing mode is obtained by operating 12 to 14.

The vent outlet 9 is composed of side outlets 15 and 16 opening left and right in the passenger compartment, and a central outlet 17 opening centrally in the passenger compartment. The center of the central outlet 17 is divided by a partition plate 18 at the center. Have been. In front of this partition plate 18, there is an air distribution door 19.
The ratio of the amount of air supplied to the left and right sides of the vehicle compartment is adjusted by controlling the air distribution door 19.

Further, the air conditioning duct 1 has a bypass duct 20 having one end opened between the evaporator 6 and the air mixing door 8 and the other end opened between the vent outlet 12 and the air distribution door 19.
Is connected. A bypass door 21 is provided at one end of the bypass duct 20, and by appropriately adjusting the driving of the door, cool air is supplied to the vent outlet 9 so that the temperature control can be finely adjusted.

The microcomputer 22 is a well-known microcomputer having a central processing unit CPU (not shown), a read-only memory ROM, a random access memory, and the like. The microcomputer 22 receives a signal selected by the multi-function MPX 23 via an A / D converter 24, and also provides a mode changeover switch 26 provided on an air-conditioning control panel 25 for switching a blowing mode. Inside / outside air changeover switch 27 for switching between introduction of outside air, A / C switch 28 for setting the cooling state, air volume changeover switch 29 for changing the rotation speed of the blower, AUTO switch 30 for automatically controlling the air conditioning control, and OFF for canceling the air conditioning control A signal from the switch 31 is input.

The Multiplex MPX23 has an integrated left and right solar radiation sensor 3 located in the center of the left and right upper part of the instrument panel.
2, 33, inside / outside temperature detection sensors 34, 35 provided above and below the vehicle interior to detect the respective temperatures, an outside air temperature detection sensor 36 to detect the temperature outside the vehicle interior, and a duct sensor 37 to detect the air temperature of the evaporator 6. , An engine used as a heat source of the heater core 7 and a water temperature sensor for detecting the temperature of the cooling water
38, an air distribution state changeover switch 39 for performing manual control of the air distribution door 19, and a temperature setting device 40 provided on the air conditioning control panel for setting the temperature in the vehicle interior are connected. Also,
First to fourth position detection sensors 41 to 44 are connected to the multiple MPX23, and the air distribution door 19, the mode doors 12 to 14, the air mix door 8, and the bypass door 21 are respectively connected thereto.
The feedback signal corresponding to the current position is input.

The microcomputer 22 is an actuator that drives the inside / outside air switching door 4 based on the various input signals described above.
45a or to the motor of the blower 5, to the compressor 46 which is connected to the evaporator 6 by piping to constitute a cooling cycle, and further drives the bypass door 21, the air mix door 8, the mode doors 12 to 14, and the air distribution door 19. Control signals are output to the actuators 45b to 45e to be driven via the drive circuits 47a to 47g, respectively, and drive control of each door, air volume control, and control of a cooling cycle are performed.

Next, an operation example of the air distribution control into the passenger compartment and the air volume control related thereto according to the present invention will be described with reference to the flowchart of FIG.

The microcomputer 22 starts execution from step 100, and inputs output signals from various sensors and the like in the next step 102. Then, based on the solar radiation signals from the left and right solar radiation sensors 32 and 33 disposed in the vehicle interior, the amount of solar radiation is calculated in the next step 104, and further in the next step 106
Calculates the solar azimuth. The solar azimuth is represented by how many times the sun is deviated left and right with respect to the traveling direction of the vehicle, as shown in FIG.

Returning to FIG. 3, in step 108, it is determined whether or not the vent outlet 9 is open. If the vent outlet 9 is closed, the determination result of step 108 is NO, and the process proceeds to step 110, where the control of the air distribution door 19 is stopped. That is, when the conditioned air is not supplied to the vent outlet 9, it is not necessary to dare to control the right and left air distribution, thereby reducing the frequency of use of the actuator 45e for driving the air distribution door 19, The durability of the actuator can be improved, and the inconvenience that the drive sound of the air distribution door 19 is generated in the blowing mode that does not require the air distribution control is eliminated.

On the other hand, if the vent outlet 9 is open, the determination result in step 108 is YES, and in step 112, the driver determines whether or not automatic control of air distribution is selected. This is performed based on the operation state of the air distribution state switch 39. This determination may be made automatically based on, for example, values of the temperature in the vehicle compartment and the amount of solar radiation. If manual control of the air distribution is selected by the switch 39, the determination result in step 112 is NO, and the process proceeds to step 110. In this case, a predetermined air distribution ratio is manually set by an operation lever (not shown).

On the other hand, when the wind distribution automatic control is selected, the process proceeds to step 114, where the wind distribution state is controlled according to the solar radiation direction SD indicated by the solar radiation direction calculation result obtained in step 106.

This air distribution automatic control is performed according to the characteristics shown in FIG. That is, when the solar radiation direction SD is within the range of ± 30 degrees, the air distribution ratio is 50 [%], that is, 1: 1. However, when the solar radiation direction SD is 30 to 70 degrees or -30 to -70 degrees, the solar radiation direction is. The air distribution ratio changes linearly in accordance with. When the solar radiation azimuth is 70 degrees or more, the upper limit air distribution ratio α = 80 [%] is constant and -70
When the temperature is less than the degree, the lower limit air distribution ratio β is constant at 20%.
Here, the range of the solar azimuth direction SD from −50 (degrees) to +50 (degrees) is referred to as A zone, and the range of the solar azimuth direction SD other than the above is referred to as B zone.

In the next step 116, the solar radiation direction SD is set to A zone or B zone.
It is determined which of the zones it is in. Solar irradiance SD is A
When in the zone, local cooling is not a problem because the distribution bias is small, without executing a series of processing steps 118, 120, 122 to avoid local cooling,
Proceed to step 124.

On the other hand, if the solar radiation direction SD is in the B zone,
At 118, the time T during which the solar radiation azimuth is continuously stagnant in the B zone is measured. In step 120, it is determined whether or not the time T measured in step 118 is larger than a predetermined value K. Step if T ≦ K
The process proceeds to step 124. If T> K, the process proceeds to step 122, where a process for gradually increasing the target blowout temperature is executed, and then the process proceeds to step 124.

In step 124, control according to the characteristics shown the adjustment position θ of the air mixing door 8 based on the target air temperature X _M determined in step 122, thereby, matching the value of the temperature of air blown from the air outlet to the target value Let it. Thereafter, when the control of the blower and other necessary controls are executed in step 126, the process proceeds to another routine via step 128.

According to this configuration, when the solar radiation azimuth continues in the B zone for a predetermined time or more, the blowout temperature gradually increases. For this reason, the air flow at the specific outlet increases due to the air distribution control according to the solar radiation direction, and as a result, when the local cooling is performed, after a lapse of a predetermined time, the outlet temperature gradually decreases, and the air is cooled to the temperature at the predetermined outlet. Can be avoided, and comfortable control suitable for a change in human bodily sensation can be performed.

Note that, in the above embodiment, a configuration in which the target value of the outlet temperature is gradually increased under predetermined conditions is shown in step 122 in order to prevent the feeling from being deteriorated due to local cooling being performed for a long time. Was. But for example, Step 1
Using the step 300 shown in FIG.
Alternatively, the voltage level applied to the motor may be changed in a pulsating manner, and the air volume may be changed with time as shown in FIG. 7, thereby avoiding local cooling. By performing such fluctuation control, it is possible to prevent a feeling of a part of the occupant's body, particularly the arm part, from being locally cooled, thereby deteriorating the feeling.

Further, a step 400 shown in FIG. 8 is provided instead of step 122 in FIG.
By performing the fluctuation control that changes the outlet temperature with the lapse of time as shown in FIG. 9 by changing the position of the air conditioner, excessive local cooling may be avoided.

FIG. 10 is a main part of a flowchart showing another configuration example in which the local cooling is prevented from being performed excessively by changing the control state of the air distribution ratio. It is provided in place of 122. Tenth
In the configuration shown in the figure, it is determined in step 500 whether or not T> K,
If T ≦ K, α = 80 [%] in step 501,
β = 20 [%] is set, whereby the air distribution ratio is controlled according to the characteristics shown by the solid line in FIG. On the other hand, if T> K, step 502 is entered, where α
= 65 [%] and β = 35 [%] are set, whereby the air distribution ratio in the zone B is limited as indicated by the two-dot chain line.

As a result, the amount of air at the outlet corresponding to the solar radiation direction is reduced, so that local cooling of the temperature can be prevented, and control can be realized in which a comfortable feeling suitable for a change in human bodily sensation can be obtained.

Furthermore, in order to avoid local cooling by the air distribution control, when air is continuously blown to the specific blowing wind direction for a predetermined time or more, the air distribution door is set to the neutral position for a predetermined time, and the air distribution control is performed. It may be controlled to stop.

A flowchart showing an example of a control program for performing such control is shown in FIG.

The control according to the flowchart shown in FIG. 11 will be described.
Then, in the next step 602, output signals from various sensors and the like are input. Then, based on the insolation signals from the left and right insolation sensors 32 and 33 disposed in the vehicle interior, the amount of insolation is calculated in the next step 604, and the insolation direction is calculated in the next step 606. In addition, as shown in FIG. 4, the solar azimuth is represented by how many times the sun is deviated left and right with respect to the vehicle signal direction.

Returning to FIG. 11, it is determined in step 608 whether or not the vent outlet 9 is open. If the vent outlet 9 is closed, the determination result in step 608 is NO, and the execution of this program cycle ends.

On the other hand, when the vent outlet 9 is open, the determination result in the step 608 is YES, and the process proceeds to a step 610.
Here, the air distribution door 19 is positioned in accordance with the solar radiation azimuth obtained by the calculation in step 606. Next Step 612
In, it is determined whether or not the solar azimuth is in the area E indicated in step 610. This E region is a solar azimuth region where the wind distribution door 19 is set to a position other than the neutral position. When the solar azimuth is in the E region, the determination result of step 612 is Y.
ES is reached, and the process proceeds to step 614, where it is determined whether or not a flag F1 indicating that the solar radiation azimuth is in the E region is set. If F1 = "0", the decision result in the step 614 is NO, the process enters a step 616, in which a timer is started, and a flag F1 is set.
to go into. If F1 = "1" in step 614, step 618 is entered without executing step 616.

In step 618, it is determined whether or not the value Tm1 of the timer started in step 616 is greater than a predetermined value a, that is, the continuation time during which the air distribution door 19 is at a position other than the neutral position by starting the air distribution control. Is determined to exceed a predetermined value a. If Tm1 ≦ a, the process proceeds to step 620, where automatic control of the air distribution door is performed.

If it is determined in step 612 that the solar radiation azimuth is not in the E region, the process proceeds to step 622, in which a flag F1 is set, and a flag F2 indicating that the air distribution door 19 is fixed to neutral as described later is set. Cleared. After a while
Enter step 620.

On the other hand, if it is determined in step 618 that Tm1> a, that is, if the state of the air distribution door 19 other than the neutral position continues for a predetermined time indicated by the value a, the determination result in step 618 becomes YES, and Proceeding to 624, where the air distribution door 19 is secured centrally, whereby local cooling avoidance will be performed.

Next, the process proceeds to step 626, where it is determined whether or not the flag F2 is set. If F2 = "0", the process proceeds to step 628 where the timer is started and the flag F2 is set. Is performed, and thereafter, step 630 is entered. If F2 = "1" in step 626, step 630 is entered without executing step 628.

At step 630, it is determined whether or not the timer value Tm2 at this time is larger than a predetermined value b. If Tm2 ≦ b, the program cycle ends. On the other hand, if Tm2> b, the process proceeds to step 632, where the flags F1 and F2 are both cleared, and the execution of this program cycle ends.

As described above, in the control according to the program shown in FIG. 11, when the air distribution door 19 is operated so that the air distribution door position is not at the neutral position, and the state continues for a predetermined time indicated by the value a, In step 624, the air distribution door 19 is fixed to the center, and the air distribution control is stopped, whereby local cooling is avoided. When this suspension state is continued for a predetermined time indicated by the value b, the air distribution control according to the solar radiation direction at that time is executed again.

(Effect of the Invention) According to the present invention, as described above, when controlling the air distribution ratio in accordance with the solar radiation direction, if local cooling is continuously performed for a predetermined time or more, it is determined. Measures to avoid local cooling in order to prevent a part of the occupant's body from cooling down extremely and deteriorating the feeling, and to provide comfortable control suited to changes in human bodily sensation Can be.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a block diagram showing an embodiment of a vehicle air-conditioning control apparatus of the present invention, and FIG. 3 is a control program executed by the microcomputer shown in FIG. FIG. 4 is an explanatory diagram showing the relationship between the vehicle body and the solar azimuth, FIG. 5 is a characteristic diagram showing the characteristics of air distribution control, and FIG. 6 describes a modification of the flowchart of FIG. Diagram showing the steps of the changes for the
FIG. 7 is a graph for explaining the operation in the steps shown in FIG. 6, FIG. 8 is a diagram showing steps of a modified portion for explaining another modification of the flowchart of FIG. 3,
FIG. 9 is a graph for explaining the operation in the step shown in FIG. 8, FIG. 10 is a partial flowchart showing a modified portion for explaining still another modification of the flowchart of FIG. 3, and FIG. 3 is a flowchart showing another control program executed by the microcomputer of FIG. 200 air distribution ratio adjusting means 201 solar radiation detecting means 202 solar radiation azimuth calculating means 203 control means 204 determining means 205 local cooling avoidance means

Claims (1)

(57) [Claims] An air distribution ratio adjusting means for adjusting an air distribution ratio at a plurality of air outlets into a vehicle interior, an insolation amount detecting means for respectively detecting an insolation amount at a plurality of locations in a vehicle, and the insolation amount A solar azimuth calculating means for calculating a solar azimuth in response to an output of the detecting means; and a wind distribution ratio adjusting means for obtaining a required air distribution ratio in accordance with the calculated solar azimuth in response to the output of the solar azimuth calculating means. Control means for controlling the air flow, a judgment means for judging whether or not the air is continuously blown to the specific blowing wind direction for a predetermined time or more based on the output of the solar azimuth calculating means, and a specific blowing in response to the judgment means. An air-conditioning control device for a vehicle, comprising: local cooling avoidance means for avoiding local cooling in the wind direction when air is continuously blown in the wind direction for a predetermined time or more.