JP2844251B2 - Blow-off control device for automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention has both a function of adjusting a right and left air distribution ratio in a vehicle cabin and a function of swinging a blowing direction of air blown from an outlet. The present invention relates to a blowout air control device for an automotive air conditioner.

(Prior Art) Conventionally, as a device for adjusting the air distribution ratio between left and right in a vehicle cabin, for example, as disclosed in Japanese Patent Publication No. 58-50884,
It has insolation detecting means for detecting the ratio of the amount of solar radiation in each part of the vehicle interior, and setting means for setting the air conditioning balance of each part of the vehicle interior, and each part of the vehicle interior according to the detected amount of solar radiation and the set air conditioning balance. It is known that the air-conditioning balance is controlled so as to improve the room temperature balance during unbalanced solar radiation.

Further, as for an apparatus for swinging the wind direction of the air blown from the outlet, for example, as shown in Japanese Utility Model Publication No. Sho 62-20335, a louver is provided in the outlet, and an outlet mode in which the outlet provided with the louver is opened. It is already known to start driving the louver when is selected to prevent the local portion from getting too cold.

(Problems to be Solved by the Invention) However, in an automotive air conditioner capable of performing both left and right air distribution control and louver control,
If the above two controls are performed at the same time, the blowout air is diffused by the swing of the louver even if the air distribution ratio on the side where the amount of airflow is required to be increased (the side on which the solar radiation hits) in the air distribution control increases. There is a disadvantage that the local temperature rise due to the solar radiation cannot be sufficiently removed.

Therefore, in the present invention, the above disadvantages are solved,
It is an object of the present invention to provide a blower wind control device for an air conditioner for a vehicle, which can selectively use a wind distribution control at the time of unbalanced solar radiation and a swing control of a blowout wind direction by a louver in accordance with the situation of the solar radiation to obtain a more comfortable air conditioning feeling. And

(Means for Solving the Problems) The gist of the present invention is that, as shown in FIG. 1, an air distribution door 24 for changing the air distribution ratio to the left and right in the vehicle compartment, Louvers 25, 26, and 27 provided at the air outlets that blow out into the vehicle compartment to change the direction of the blown wind, solar radiation detecting means 200 for detecting the amount of solar radiation in the vehicle cabin, and solar radiation detected by the solar radiation detecting means 200 A solar radiation azimuth calculating means 210 for calculating the solar radiation azimuth with respect to the vehicle traveling direction from the quantity signal, and determining the air distribution ratio between the left and right of the vehicle cabin based on the solar radiation azimuth calculated by the solar radiation azimuth calculating means 210; The wind distribution door control means 220 for driving and controlling the wind distribution door 24 so as to achieve the wind ratio, the louver control means 230 for swinging the louvers 25, 26, 27, and the solar azimuth calculation means 210 are calculated. At least one condition that the solar azimuth Wherein actuating the air distribution door control unit 220 is to include a selection unit 240 for operating the louver control unit 230 in the other cases.

(Operation) Therefore, when the solar radiation azimuth is equal to or more than a predetermined angle with respect to the traveling direction of the vehicle, for example, when the solar radiation is largely deviated right and left, it is desired to control the blowing wind that exclusively removes the temperature rise in the portion where the solar radiation is applied. Thus, only the air distribution control is performed under one condition that the solar radiation azimuth has become equal to or more than the predetermined angle by the selecting means, the louver is stopped, and a large amount of wind is intensively supplied to the local area where the solar radiation is applied. In addition, when the solar radiation is in a predetermined direction with respect to the vehicle traveling direction, for example, when sunlight falls from the front of the vehicle, it is desired that the air distribution control is not required and the local area in front of the air outlet is suppressed from being too cold. In this case, a louver swing control is performed, and a wind direction control for blowing or avoiding the wind at a predetermined cycle is performed.

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

In FIG. 2, an air conditioning control device for an automobile is provided with an inside air inlet 3 and an outside air inlet 2 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 3 and the outside air inlet 2 are separated. A desired suction mode is obtained by operating the inside / outside air switching door 5 by an actuator 6 and selecting the air to be introduced into the air conditioning duct 1 into inside air and outside air.

The blower 7 draws air into the air-conditioning duct 1 and blows the air downstream, and an evaporator 8 is disposed behind the blower 7. The evaporator 8 is connected to a pipe together with a compressor, a condenser, a receiver tank, and an expansion valve (not shown) to form a refrigeration cycle.

A heater core 9 is disposed behind the evaporator 8, and an air mixing door 10 is provided upstream of the heater core 9.
The amount of air passing through the heater core 9 and air bypassing the heater core 9 is changed by adjusting the degree of opening of the air mix door 10 by the actuator 10a. It is controlled.

On the downstream side of the air conditioning duct 1, a defrost air outlet 11, an upper air outlet 12 and a foot air outlet 13 are opened in the vehicle interior 31, and mode doors 14, 15, 16 are provided at the respective air outlets. The mode doors 14, 15, 16 are driven and controlled by an actuator 17 so as to be suitable for a desired blowing mode. An upper outlet duct 18 is connected to the upper outlet communication port 12, and on the downstream side, a right upper outlet 19 that opens at a right position in a vehicle interior 31, and a left upper opening 19 that also opens at a left position. An upper air outlet 20 and a central upper air outlet 21 are provided, and an air distribution door 24 is provided on an upstream side of a partition plate 22 disposed in a divided portion thereof. Control is performed.

Each of the right upper outlet 19, the central upper outlet 21 and the left upper outlet 20 has a louver (wind direction changing plate).
25, 26, 27 are provided, and actuators 28, 29, 30 respectively
Thus, the blowout wind direction is controlled. The actuators 6, 10a, 17, 23, 28, 29, 30 and the motor of the blower 7 are provided with respective drive circuits 35a, 35b, 35c, 35d, 35e for converting commands from the microcomputer 33 described below into control outputs. , 35f, 35
It is controlled based on the output signal from g, 35h.

The microcomputer 33 is a central processing unit (not shown)
CPU, read-only memory ROM, random access memory RA
M, an input / output port I / O, etc., which is well known per se, based on a flowchart stored in advance based on various input signals described below, and based on a flow chart of the inside / outside air switching door 5, the blower 7, the air mixing door 10, the mode doors 14, 15, 16, the air distribution door 24, and the louvers 25, 26, 27 are controlled.

The microcomputer 33 stores the temperature T _r of the air in the passenger compartment.
Vehicle interior temperature sensor 36 for detecting the outside air temperature sensor 37 for detecting the outside air temperature T _a, the left and right insolation T _SR, solar radiation sensor 38a for detecting a T _SL, the detection signal multiplexer 4 from 38b such
It is selected at 0 and input to the A / D converter 41, where it is converted to a digital signal and input.

Various signals are input to the microcomputer 33 from the operation panel 42 described below. That is, the operation panel
42 is an A / C switch 43 for operating the compressor, an ECON switch 44 for economical compressor control (both switches 43 and 44 also serve as an automatic control mode switch),
OFF switch 45 to stop the operation of the air conditioner, DEF switch 46 to set the blowing mode to defrost mode, temperature setting device 47 to set the temperature in the cabin, blowing capacity setting device 48 to set the blowing capacity, other than defrost mode Mode setting unit 49 for setting the air outlet mode, suction mode setting unit 50 for setting the suction mode, left and right air distribution control lever 51 for manual control of the air distribution ratio, and louver switch 52 for controlling the louvers 25, 26, 27. And the like. The operation panel 42 has a display unit 54, and the set temperature, blowing capacity, blowing mode, and suction mode are displayed via the display circuit 54.

Next, a flowchart for controlling the louver and the air distribution door according to the solar radiation azimuth will be described with reference to FIG.

Control is started from a start step 60, and step 62
In the right and left solar sensor 38a, 38b, the detection value T _SL by vehicle interior temperature sensor 36, T _SR, T _r and air distribution control lever 51,
A data input process for inputting an output signal of the louver switch 52, a blowing mode signal and the like to the microcomputer 33 is performed.

In the next step 64, the amount of solar radiation T _S used for control is calculated based on the output signals T _SL and T _SR of the left and right solar radiation sensors 38a and 38b. The specific computation is like a subroutine shown in FIG. 4 for example, first, on the basis of the output signal T _SR of the output signal T _SL and the right solar radiation sensor 38b of the left sunlight sensor 38a at step 90 The interpolation value (T
_SR + T _SL ) / K ₂ is obtained, and this is set as the control value T _S. It is necessary to introduce such interpolation values because each of the solar radiation sensors 38a, 38
Since b has directivity as shown by the solid line in FIG. 5, it is difficult to obtain a uniform output value regardless of the azimuth direction,
This is to compensate for this. Therefore, the operation constant K ₂ is
For example, a value such that the peak of this interpolated value is equal to the peak of _TSL or _TSR , and in the following steps, _TSL ,
An operation of replacing the largest value of (T _SR + T _SL ) / K ₂ , T _SR with the control value T _S is performed (steps 92 to 100).

After the calculation of the solar radiation amount is completed, the calculation of the solar radiation azimuth is performed in step 66. FIG. 6 shows a specific example (subroutine) of this calculation. In step 102, the magnitudes of the output signals T _SL and T _SR of the left and right solar radiation sensors 38a and 38b are compared. Seek left deviation coefficient T _SL based on the left solar output signal T _DL sensors 38a proceeds to step 104 is greater than the output signal T _SR of the right sunlight sensor 38b (1) equation, to step 106 the larger the T _SR Right deviation coefficient T based on advance (2)
_Ask for _DR .

However, K ₁ is a processing constant.

Then, in step 108, it derives the solar azimuth T _SD with respect to the vehicle traveling direction from the coefficient T _DL or T _DR obtained in the step 104 or 106.

Next, the process proceeds to step 68, in which the insolation T _S
A calculation is performed to determine whether the air distribution control on the left and right sides of the vehicle interior is to be automatic or manual based on the vehicle interior temperature _Tr . That is, as shown in FIG. 4, when the solar radiation amount T _S is relatively large and the vehicle interior temperature _Tr is low (region A), automatic control is performed, and the solar radiation amount T _S is relatively small and the vehicle interior temperature _Tr is reduced. When it is high (region B), manual control is performed.

Thereafter, the process proceeds to step 70, where it is determined whether or not the louver switch 52 has been pressed (ON).
Go to 4, if NO, go to step 72, louver 25, 26, 2
Stop driving of 7.

In step 74, it is determined whether or not the upper outlet communication port 12 is open, that is, whether the vent mode is the vent mode or the bi-level mode. If YES (open), the following steps 78, 80, Proceeding to 82, 84, 86, 88, air distribution control and louver control are performed, but if NO (the upper outlet communication port 12 is closed), air distribution control and louver control are unnecessary, and step Proceeding to 76, both controls are stopped.

In step 78, it is determined whether or not the air distribution control is automatic. If it is manual, the process proceeds to step 80, and if it is automatic, the process proceeds to step 84 to shift to the automatic control.

In steps 80 and 82, manual control of air distribution is performed, and the air distribution door 24 is appropriately controlled by the position of the air distribution control lever 51 as shown in the step. That is,
The setting position of the air distribution control lever 51 is at the center (scale 0)
In this case, the left and right air distribution ratios are equal, and in other cases, the left and right air distribution ratios are determined in proportion to the ratio of movement in the + or-direction. In this case, the amount of solar radiation T _S is equal to or less than the predetermined amount (see step 68), and the feeling of cooling due to the wind being continuously applied to the local area is stronger than the feeling of warmth due to solar radiation.
As shown in step 82, control for swinging the louvers 25, 26, 27 at a constant period is performed.

In contrast, when air distribution control is performed automatically,
In step 84, the air volume allocation determined by solar radiation direction T _SD, for example該日morphism left and right airflow ratio between the azimuth of -30 ° to + 30 ° is 1: 1, and at -70 DEG over a -30 ° ( The airflow on the left side gradually increases when the airflow exceeds -70 ゜, and the airflow ratio between the left and right becomes 5: 1. When the airflow exceeds +30 ゜ and reaches +70 ゜ (the uneven solar radiation range), the airflow on the right side increases. Gradually increases, and when it exceeds + 70 °, the ratio of air flow between right and left becomes 5: 1.

When the air distribution amount is determined, the process proceeds to step 86, where the louver is automatically controlled. In step 86, the louvers 25, 26, and 27 are set at the front (louver azimuth angle of 0 °) and fixed when the azimuth _TSD is −30 ° to + 30 °, similarly to the wind distribution control. When T _SD exceeds -30 ゜ or +30 ゜, it begins to change gradually, and at -70 ゜ or +70 ゜ the maximum 45
Fixed to ゜.

That is, the operating state is shown in FIG. 7, and when the solar radiation direction exceeds, for example, + 30 ° (referred to as “unbalanced solar radiation”), the louvers 25 and 27 mainly blow the blowing wind (arrow) to the driver. Will be turned. In this case, the louver 27 of the central upper outlet 21 is directed to the driver, but is not limited to this, and may be directed to the assist-side occupant. Louver 27 to the right
The louver 27 may be directed to the left when the solar radiation is from the left side.

Then, in the next step 88, it is determined whether or not the solar radiation direction _TSD is within a predetermined angle based on the azimuth 0 ° (vehicle traveling direction). That is, in this step 88, the airflow distribution control shown in the above steps 84 and 86 is not performed and the louver direction setting is not performed.
゜ to 30 ゜) to determine whether it is within the
_{If SD} is within this range (−30 ゜ <T _SD <30 ゜), there is not much unevenness of solar radiation, so it is considered that there is not much unevenness of temperature in the cabin due to solar radiation. In order to prevent this, the louvers 25, 26, and 27 are swing-controlled at regular intervals, similarly to the manual control (step 82).

Further, T _SD is significantly deviates to the left or right of the vehicle, if the condition is not satisfied in step 88 (-30 ° <T _SD <30 °), the determined position of the louver 25, 26 and 27 in step 86 , But the swing control at a fixed period as in step 82 is not performed. Therefore, step 84
Is performed in preference to the louver swing control, and conditioned air is intensively supplied to locations where the temperature has increased due to uneven solar radiation.

(Effects of the Invention) As described above, according to the present invention, when the solar radiation direction is greatly inclined with respect to the vehicle traveling direction, this is one condition, and only the air distribution control is performed without performing the louver swing control. In this way, blowout air is intensively supplied to the area where solar radiation strikes to enhance the cooling effect of that part, and when the solar radiation direction is not inclined too much, swing control is performed with a louver to prevent excessive cooling of the local area With this configuration, it is possible to selectively use the air distribution control and the louver swing control in accordance with the influence of the solar radiation on the occupant, thereby obtaining a more comfortable air conditioning feeling.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a schematic configuration diagram showing an automotive air conditioner according to the present invention, and FIG.
Fig. 4 is a flowchart showing an example of a routine of blow-out air control by a microcomputer used in the vehicle air conditioner, Fig. 4 is a flowchart showing a subroutine example of solar radiation amount calculation, and Fig. 5 is a flowchart showing a solar radiation amount calculating method in the above. FIG. 6 is a flowchart showing an example of a subroutine for calculating the solar azimuth, and FIG. 7 is an enlarged view showing the vicinity of an air outlet of a vehicle air conditioner used for explaining control of a louver. . 24 air distribution door, 25, 26, 27 louver, 200 solar radiation detecting means, 210 solar radiation azimuth calculating means, 220 air distribution door control means, 230 louver control means, 240 ... selection means.

Claims (1)

(57) [Claims] An air distribution door for changing the ratio of air distribution to the left and right in the vehicle interior, a louver provided at an air outlet for blowing conditioned air into the vehicle interior, and a louver for changing the direction of the blown air; A solar radiation amount detecting means for detecting, a solar radiation direction calculating means for calculating a solar radiation direction with respect to a vehicle traveling direction from a solar radiation amount signal detected by the solar radiation amount detecting means, and a solar radiation direction calculated by the solar radiation direction calculating means. Air distribution door control means for determining the air distribution ratio between the left and right of the vehicle compartment and driving and controlling the air distribution door so as to have the determined air distribution ratio; louver control means for swinging and controlling the louver; Selecting means for operating the air distribution door control means under at least one condition that the solar azimuth calculated by the solar azimuth calculation means is equal to or larger than a predetermined angle, and otherwise operating the louver control means. A blowout air control device for an automotive air conditioner, comprising: