JP2816752B2 - Air distribution control device for automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a device for adjusting a left and right air distribution ratio in a vehicle compartment according to a solar radiation condition, in particular, left and right air distribution control in an auto mode is started or stopped. The present invention relates to an air distribution control device for an air conditioner for a vehicle, in which an air distribution state at the time of switching is improved.

(Prior Art) Various devices that control the air distribution ratio between left and right in a vehicle cabin based on an output signal from a solar radiation sensor in consideration of the influence of solar radiation on an occupant have been conventionally considered. For example, an air distribution door that changes the air distribution ratio between the left and right compartments of the vehicle air conditioner is provided, and a solar radiation correction signal that gradually increases or decreases gradually with respect to a sudden change from the amount of solar radiation detected by the solar radiation sensor is formed. When the solar radiation correction signal falls below a predetermined value, the air distribution door is set to a position where the left and right air distribution ratio becomes 1: 1.When the solar radiation correction signal exceeds the predetermined value, the air distribution door is distributed according to the solar radiation direction. The technology for driving the wind door and changing the air flow based on the solar radiation correction signal is being developed by the present applicant.

(Problems to be Solved by the Invention) However, as described above, when the presence or absence of the left and right air distribution control is determined based on whether the solar radiation correction signal is smaller or larger than a predetermined value, the following relationship with the rotation control of the blower is provided. Failure occurs.

That is, when the amount of solar radiation changes from a small state to a large state, for example, when the sun goes out of the shade, as shown in FIG. 7, the solar radiation correction signal Tsc gradually increases with the change of the solar radiation Ts. Is calculated, and the rotation speed of the blower also gradually increases in accordance with the change in the amount of solar radiation correction. In this case, considering that the solar azimuth direction is largely biased toward the driver, the air distribution door is fixed at a position where the air distribution ratio is 1: 1 until the solar radiation correction signal Tsc reaches a predetermined value. When the correction signal Tsc gradually increases and exceeds a predetermined value, the air distribution ratio fluctuates suddenly (solid line in FIG. 7 (d)). For this reason, the airflow on the driver side and the airflow on the assist side gradually increase at the same rate until the solar radiation correction signal Tsc reaches the predetermined value, but when the solar radiation correction signal exceeds the predetermined value, the airflow on the assist side becomes the seventh. The air volume on the driver side rapidly decreases as shown by the solid line in FIG. 7F, and conversely decreases as shown by the solid line in FIG.

Given the desire to increase the driver's airflow when the sun hits the driver, a rapid increase in the driver's airflow is rather desirable, but for the assist side, the airflow that has increased over time has suddenly increased. As a result, the passenger becomes uncomfortable.

Conversely, when the amount of insolation changes from a large state to a small state, for example, when the sun starts to shade, as shown in FIG. 8, the insolation correction signal Tsc that gradually decreases with the change in the amount of insolation Ts is generated as shown in FIG. The calculated rotation speed of the blower is also gradually reduced in accordance with the change in the amount of solar radiation correction. In this case, considering the case where the solar radiation stops being applied from the state where the solar radiation is largely biased toward the driver side, the air distribution door increases the air distribution ratio on the driver side until the solar radiation correction signal reaches a predetermined value. When the solar radiation correction signal gradually decreases and falls below a predetermined value, the position is returned to the position where the left and right air distribution ratio becomes 1: 1 (solid line in FIG. 8 (d)).
For this reason, until the solar radiation correction signal reaches a predetermined value, both the air flow on the driver side and the air flow on the assist side become smaller in accordance with the ratio determined by the air distribution door, but when the solar radiation correction signal falls below the predetermined value, the air flow on the assist side becomes smaller. The air volume rapidly increases as shown by the solid line in FIG. 8 (e), and the air volume on the driver side suddenly decreases as shown by the solid line in FIG. 8 (f).

Considering the desire to reduce the driver's airflow in the event of insolation, a rapid decrease in the driver's airflow is rather desirable. And the passengers feel uncomfortable.

The inconvenience described above also occurs when the solar radiation is biased toward the assist side. Therefore, in the present invention, the change in the air flow at the time of switching to start or stop the air distribution control is smoothed, It is an object of the present invention to provide an air distribution control device for an automotive air conditioner that does not cause a sense of discomfort.

Another object of the present invention is to change the air distribution amount according to the change pattern of the air flow rate by the blower so that the air distribution control can be performed without a sense of incongruity even when the change pattern of the air flow rate changes. And

(Means for Solving the Problems) The gist of the present invention is that, as shown in FIG. 1, a solar radiation correction for forming a solar radiation correction signal by delaying a solar radiation signal detected by a solar radiation sensor. A signal forming unit 200, a solar azimuth calculating unit 210 that calculates a solar azimuth based on a solar signal detected by a solar sensor, and a blowing amount based on a solar correction signal formed by the solar correction signal forming unit 200. Control means 220 for controlling the blower 7 in accordance with the output of the blower amount calculating means 220, and the air distribution door 24 for changing the air flow distribution between the left and right sides of the passenger compartment in an automatic mode. Determination means 240 for determining whether or not to perform the air distribution control, and at the start of the air distribution control in the automatic mode, the actual air distribution door 24 is moved to the target position of the air distribution door 24 determined based on the solar radiation direction calculation means 210. The position of the air distribution door 24 is gradually changed in accordance with the output signal from the air volume calculation means 220, and when the air distribution control in the automatic mode is stopped, the actual position of the air distribution door 24 is moved to a predetermined set position. An air distribution door control amount calculation unit 240 that calculates a control amount of the air distribution door 24 that is gradually changed according to an output signal from the 220, and the distribution amount based on the control amount calculated by the air distribution door control amount calculation unit 250. Wind door 2
4 is provided with an air distribution door drive control means 260 for controlling the operation of the air conditioner 4.

(Operation) Therefore, when there is a change in the amount of insolation, an insolation correction amount forming means forms an insolation correction signal for slowly changing a sudden change in the amount of insolation. The air volume is calculated. Therefore, the rotation of the blower does not change rapidly but changes gradually.

At this time, at the time when the automatic mode control of the air distribution door is started, the position of the air distribution door is determined by the air distribution door control amount calculating means in accordance with the solar radiation direction based on the control signal of the blower. 7 (e) and 7 (f).
It changes smoothly as shown by the wavy line.

Further, when the automatic mode control of the air distribution door is stopped, the position of the air distribution door is gradually changed toward a predetermined set position based on the control signal of the blower by the air distribution door control amount calculating means. That is, the air distribution amounts on the left and right sides of the vehicle compartment smoothly change as shown by the wavy lines in FIGS. 8 (e) and 8 (f).

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

In FIG. 2, the air-conditioning control device for a vehicle is provided with an inside air inlet 2 and an outside air inlet 3 on the most upstream side of the air conditioning duct 1,
An inside / outside air switching door 5 is arranged at a portion where the inside air inlet 2 and the outside air inlet 3 are separated, and the inside / outside air switching door 5 is operated by an actuator 6 to convert air introduced into the air conditioning duct 1 into inside air and outside air. A desired inhalation mode can be obtained by making a selection.

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 the amount of air bypassing the heater core 9 are changed by adjusting the opening degree of the air mix door 10 by the actuator 10a. The temperature is controlled.

On the downstream side of the air conditioning duct 1, a defrost air outlet 11, a vent air outlet 12, and a foot air outlet 13 are opened in the vehicle interior 30, and mode doors 14, 15, and 16 are provided at the respective air outlets. I have. On the downstream side of the mode door 15, a right outlet 21 opening at a right position in the vehicle interior 30, a left outlet 20 and a central outlet 19 opening at the left position are provided.
An air distribution door 24 is provided in front of the partition plate 22 arranged at the divided portion. The mode doors 14, 15, 16 are controlled by an actuator 17, and the air distribution door 24 is controlled by an actuator 23, so that a desired blowing mode and air volume distribution can be obtained.

The motors of the actuators 6, 10a, 17, 23 and the blower 7 are respectively connected to drive circuits 40a, 40b, 40c, 40d, 40e.
Is controlled based on the output signal from the
40e are connected to the microcomputer 33.

On the other hand, a solar radiation sensor 2 for detecting the left and right solar radiation amounts S _R1 and S _L1
5, an outside air temperature sensor 26 for detecting the temperature Ta of the outside air, a cabin temperature sensor 27 for detecting the temperature Tr in the cabin, a mode sensor 28 for detecting the temperature Te on the downstream side of the evaporator 8, and a vicinity of the occupant's head. A detection signal from the vehicle interior head temperature sensor 29 for detecting temperature is selected by the multiplexer 31 and
The signal is input to the D converter 32, where it is converted into a digital signal, and then input to the microcomputer 33. Further, an output signal from the operation panel 34 is input to the microcomputer 33.

The operation panel 34 has an A / D switch 41 for operating the evaporator 8 and an ECON switch 42 for performing economical compressor control. Each of the air conditioners enters an automatic control mode when any of these switches is pressed. The operation panel 34 has an OFF switch 4 for stopping the operation of the air conditioner.
3, DEF switch 44 to set the blowing mode to the defrost mode, temperature setting device 45 to set the set temperature Td in the cabin, blowing capacity setting device 46 to set the blowing capacity, blowing mode to set the blowing mode other than the defrost mode A setter 47 and an absorption mode setter 48 for setting the suction mode to the mode for introducing only outside air (FRESH) or the mode for introducing only inside air (REC) are provided. The set temperature, air blowing capacity, blowing mode, and suction mode Is displayed on the display unit 49 controlled by the microcomputer 33.

Further, a setting signal from an air distribution ratio setting device 39 (having an air distribution lever 39a) to be installed in or near the operation panel 34 is also input to the microcomputer 33.

The microcomputer 33 has a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O), etc. (not shown). Based on the signals, control signals are output to the actuators 6, 10a, 17, 23 and the motor of the blower 7 via drive circuits 40a to 40e, respectively, to drive the respective doors 5, 10, 14, 15, 16, 24. Control and rotation control of the blower 7 are performed.

Next, an example of the air conditioning control operation of the microcomputer 33 will be described with reference to a flowchart shown in FIG.

The microcomputer 33 starts processing from a start step 50, and in step 52, performs data input processing of a detection value of each sensor. That is, each detection value S _R1 , S _L1 , Ta, Tr, Te, Trh from the solar radiation sensor 25, the outside air temperature sensor 26, the vehicle interior temperature sensor 27, the mode sensor 28, and the vehicle interior head temperature sensor 29.
Is input to the microcomputer 33.

In the next step 54, data input processing of the vehicle interior set temperature Tset set by the temperature setting device 45 is performed,
The solar azimuth calculation of step 56 is performed.

A specific example of the solar azimuth calculation in step 56 is shown in FIG. 4. In FIG.
Starting from, determines whether the step 92 in the right sunlight sensor S _R has failed (short circuit failure), the solar radiation direction and the center proceeds to step 94, if YES, the program proceeds to subsequent return step 104 the Proceed to the left / right air distribution control routine. If NO, proceed to step 96. In step 96, it is determined whether or not the left solar radiation sensor _SL has a failure (short failure). If YES, the process proceeds to step 104,
If NO, proceed to step 98 and detect the value of the right solar radiation sensor
Compare the magnitude of S _R1 with the detection value S _L1 of the left solar radiation sensor,
_{If R1} ≧ _SL1 , the process proceeds to step 101, and if _SR1 < _SL1 , the process proceeds to step.

In step 101, the operation of the solar radiation the right direction, that is, D _R = K ₁ · solar radiation azimuth angle rightward as D _R (S _R1 -S
_L1) / S _R1 (where, K ₁ is after performing the operation constant), the routine proceeds to RETURN step 104. In step 102,
After calculating the solar radiation leftward, that is, assuming that the solar radiation azimuth angle in the leftward direction is D _L , calculate D _L = K ₁ · (S _L1 −S _R1 ) / S _L1 (where K ₁ is a constant) and then return. Proceed to step 104. Then, the process proceeds to step 58 in FIG. 3 via the return step 104.

In step 58, the insolation calculation shown in FIG. 5 is performed. This calculation will be described with reference to FIG.
The microcomputer 33 starts at step 110, in step 112, determines whether the right sunlight sensor S _R has failed (short circuit failure), if YES, the process advances to step 114, to step 116 if NO move on.

In step 114, it is determined whether or not the left solar radiation sensor _SL has a failure (short failure). If YES, the process proceeds to step 118, where the solar radiation amount (solar radiation intensity) Ts is set to zero, and then the return step is performed. Proceed to 132. Left sunlight sensor willing solar radiation amount Ts to step 120 if NO S _L of the detected value S _L1
Is set, and the process proceeds to the return step 132.

In step 116, it is determined whether or not the left solar radiation sensor _SL has a failure (short-circuit failure). If YES, the process proceeds to step 122, and if NO, the process proceeds to step 124. In the step 122, the detection value S _R1 of the right insolation sensor S _R is set to the insolation Ts and the return step 1
Proceed to 32.

In step 124, it compares the magnitude of the detected value S _R1 and the left solar radiation sensor S _L of the detected value S _L1 of the right sunlight sensor S _R, the process proceeds to step 126 if S _R1 ≧ S _L1.

In step 126, the detected value S _R1 of the right sunlight sensor S _R, the combined value of the detected value S _L1 of the detected value S _R1 and the left solar radiation sensor S _L of the right sunlight sensor _{S R (S R1 + S L1} ) / K ₂ (However,
K ₂ is a constant. ), The process proceeds to step 130 if (S _R1 + S _L1 ) / K ₂ ≧ S _R1 , and proceeds to step 122 if (S _R1 + S _L1 ) / K ₂ <S _R1 .

On the other hand, in step 128, the left solar radiation sensor S
_L and the detected value S _L1 of the combined value of the detected value S _L1 of the detected value S _R1 and the left solar radiation sensor S _L of the right sunlight sensor _{S R (S R1 + S L1} ) / K
₂ (however, K ₂ is a constant.) Is compared _{with, (S R1 + S L1)} / K 2 ≧
If S _L1 , proceed to step 130, where (S _R1 + S _L1 ) / K ₂ <S _L1
If so, the process proceeds to step 120.

In step 130, the detection value of the detection value S _R1 and the left solar radiation sensor S _L of the right solar sensor S _R to the amount of solar radiation Ts S _L1
Is set to (S _R1 + S _L1 ) / K ₂ , and the flow advances to the next step 62 of the main routine via the return step 132. Note that the actual value of Ts is represented by a value corresponding to the temperature.

In step 60, the insolation calculated in step 58
The delay processing shown in FIG. 6 is performed on Ts, and the delayed signal is used as the solar radiation correction signal Tsc. That is, Tsc corrects a sharp rise (for example, a rise from 0 ° C. to 3 ° C.) with respect to a time change of the solar radiation Ts so as to gradually increase at a rate of 1 ° C. per 10 seconds. It does not react for a predetermined time (for example, 30 seconds) to a sharp fall (for example, a fall from 3 ° C. to 0 ° C.), and is then corrected so as to gradually decrease at a rate of 1 ° C. every 10 seconds. is there. The reason why the delay processing of Ts is performed in this way is to smoothly change the air conditioning even if Ts changes frequently, such as when the vehicle passes through a tree or the like.

Then, in step 62, the calculation of the total signal T is performed. The calculation of the total signal T is obtained by the following equation (1) using, for example, the detection values of the respective sensors.

T = Tr + KsTs + KeTe + KaTa + KsetTset + C (1)
Where Ka, Ks, Ke, and Kset are gain constants, and C is a calculation constant.

In step 64, the target opening of the air mix door 10 is calculated from the total signal, and the process proceeds to step 66. In step 66, the actuator 10a is driven based on the calculation result of the target opening to control the air mix door 10,
Proceed to step 68.

In step 68, the target air volume of the blower 7 is calculated. The target air volume calculated in step 68 becomes a larger value as the amount of solar radiation increases. Then, in step 70, the motor of the blower 7 is driven based on the result of the calculation of the target air flow. In particular, the rotation control of the blower based on the fluctuation of the amount of solar radiation includes:
As shown in FIG. 7 (c) and FIG. 8 (c), the adjustment is performed in accordance with the change of Tsc. For example, the air flow (applied voltage) is increased or decreased in proportion to Tsc.

In the next step 72, a control amount calculation of the air distribution door 24 is performed. In this calculation routine, the control method of the left and right air distribution control (automatic or manual) based on the solar radiation amount Ts and the vehicle interior head temperature Trh. ), And determines the control amount of the air distribution door 24 in the determined control method.
Specifically, the processing shown in FIG. 9 is performed.

That is, the microcomputer 33 performs a start step
Execution of this process is started from 140, and in step 142, it is determined whether or not the setting position of the air distribution lever 39a is the left end.
If ES, the process proceeds to step 144, where the left outlet 20 is fully opened and fixed, and the process proceeds to return step 166. If NO, the process proceeds to step 146. In this step 146, the air distribution lever 39a
It is determined whether or not the set position is at the right end. If YES, the process proceeds to step 148, where the right outlet 21 is fully opened and the process proceeds to the return step 166. If NO, the process proceeds to step 150. In this step 150, it is determined whether or not the blowing mode is the vent mode.
If NO, proceed to step 152. This step 1
At 52, it is determined whether or not the blowing mode is the bi-level mode.If YES, the process proceeds to step 154.If NO, the process proceeds to step 156 to fix the air distribution door 24 at the center,
Proceed to return step 166.

In step 154, the above-mentioned solar radiation amount Ts (this solar radiation amount Ts is a composite value of the two solar radiation detection values S _R1 and S _L1 calculated by the processing of the flowchart in FIG. 5) and the vehicle interior head. Based on the unit temperature Trh, calculation is performed to determine whether the air distribution control on the left and right sides of the vehicle compartment is to be automatic or manual. That is, as shown in FIG. 10, when the solar radiation amount Ts is equal to or more than a predetermined amount (for example, 2.0 in FIG. 10) and the vehicle interior head temperature Trh is, for example, 35 ° C. or less (region (A)), the automatic control is performed (35). When the solar radiation Ts is relatively large even when the temperature is higher than ℃, the automatic control is performed). When the solar radiation Ts is less than a predetermined amount (for example, 1.5 in the figure) or when the head temperature Trh in the vehicle compartment is relatively high, for example, 35 ° C or more At the time [region (B)], the annual control is performed. The area (C) is a transition area for preventing hunting. Then, the process proceeds to step 158, where the vehicle interior set temperature T
It is determined whether or not set is set to the minimum temperature (MAX COOL). If YES, the process proceeds to step 160, and if NO, the process proceeds to step 162.

In step 160, the left and right air distribution is manually set by the air distribution lever 39a. That is, as shown on the right side of FIG. 11, in the manual setting, the air distribution lever 39a
Setting position and the air volume ratio of the left and right outlets 20 and 21 (air distribution door 2
The opening degree of 4) is in a direct proportional relationship, and the air distribution ratio desired by the occupant can be set by operating the air distribution lever 39a.
Here, as for the opening degree of the air distribution door 24, a position where air is distributed only to the right side of the vehicle is 100%, and a position where air is distributed only to the left side is 0%.

In step 162, it is determined whether or not the calculation result of step 154 is an automatic control. If YES, the process proceeds to step 140, and if NO, the process proceeds to step 166.

In step 164, immediately after shifting from the manual mode to the auto mode in FIG.
Is performed to switch from manual to automatic control, and if a long time has passed since the transition to the automatic mode, the automatic air distribution door 24 is stably controlled.

That is, the specific example is as shown in FIG.
In step 180, the actual blower voltage B _L and the target blower voltage B _L0 set in accordance with the magnitude of Ts (in this embodiment, when Ts reaches 3 ° C.) It is determined whether or not the magnitude is equal to the final value of _BL (7V). In the initial process of transition from the manual mode to the automatic mode B _L is smaller than B _L0, in this case, the process proceeds to step 182. When B _L gradually increases and becomes equal to B _L0 , the process proceeds to step 184, where the calculation is performed based on the left and right target detection values S _R1 and S _L1 as shown in the automatic control pattern shown in FIG. The left and right air distribution ratios (openings of the air distribution doors) are determined according to the obtained solar radiation direction. In the figure, for example, the solar radiation direction is from + 40 ° to + 60 ° (−40 ° to-
60 ゜), that is, when sunlight is coming from the right side of the vehicle and mainly on the driver's seat side (when sunlight is coming from the left side of the vehicle and mainly on the passenger side) ), The air distribution increase rate of the right air outlet 21 (left air outlet 20) is, for example, 30%, and this control characteristic is distributed according to the setting position of the air distribution lever 39a as shown by the broken line in FIG. It moves left or right on the wind door opening coordinate axis.

In step 182, the opening θ of the air distribution door 24 is calculated based on the equation (2).

Here, theta _M is opening [%] of the air distribution door is set to the manual mode, theta _A goals air distribution door opening [%] derived from Figure 11 the switching time of the auto mode, B _LM
Is the blower voltage [V] immediately before switching from the manual mode to the automatic mode.

In step 76 of the main routine, the drive circuit 40d drives the air distribution door 24 via the actuator 23 based on the control amount of the air distribution door 24 calculated in step 74. Thereafter, the process returns to the start step 50 via the return step 78.

Thus, the opening theta of air distribution door 24 is theta _M in immediately before the switching to the automatic mode that B _L is B _LM, B _L becomes becomes the target air volume B _L0 theta _A gradually increases, During that time, it changes linearly according to the size of _BL .

In the above configuration, when the solar radiation is largely biased toward the driver side (right 90 °) and the vehicle goes out of the sun to the sun, the solar radiation amount Ts becomes 0 ° C. as shown in FIG. 7 (a). When the temperature greatly changes from 3 ° C. to 3 ° C., a solar radiation correction signal Tsc is formed as shown in FIG. 7 (b), and the blowing amount gradually increases based on Tsc as shown in FIG. 7 (c). Such a condition is called T
s shifts from the manual mode area (B) to the auto mode area (A) via the area (C) in FIG. 10, and the air distribution door 24 is controlled based on step 182 in FIG. As shown by the dashed line in (), it changes linearly according to the magnitude of _BL up to the target value (see equation (2)).

In this process, assist side (As side) and driver side (Dr side)
Of Looking at air volume changes, either side, in the manual mode the air volume flow rate at which air distribution door from (60 m ³ / h in this embodiment) has reached the target opening theta _A (in this embodiment, As ~ side
80 (m ³ / h, Dr side 100m ³ / h)
It changes linearly as indicated by the dashed line (f), so that the air volume does not suddenly decrease or increase unlike the conventional case indicated by the solid line.

On the other hand, in the step 166, immediately after shifting from the auto mode to the manual mode,
Transition control for switching the air distribution door 24 from automatic to manual control is performed. If a long time has elapsed after the transition to manual control, manual control of the stability of the air distribution door 24 is performed.

That is, as shown in FIG.
To determine whether the magnitudes of B _L and B _L0 are equal, and immediately after shifting from the auto mode to the manual mode,
Since B _L0 gradually decreases as shown in FIG. 8 (c), B _L becomes B
If it is larger than _L0 , the process proceeds to step 192 in this case. When B _L gradually decreases and becomes equal to B _L0 , the process proceeds to step 194, and the position of the air distribution door 24 is determined annually similarly to step 160.

In step 192, the opening degree θ of the air distribution door 24 is calculated based on the equation (3).

According to the equation (3), the opening θ of the air distribution door 24 is represented by B _L
A theta _A before switching to the manual mode in which a B _LA, when B _L becomes equal to the target air volume gradually decreases theta _M becomes, during which changes linearly view according to the magnitude of B _L.

Therefore, when the solar radiation is largely biased toward the driver side (right 90 °) and the vehicle enters the shade from the sun, the amount of solar radiation Ts is changed from 3 ° C. to 0 ° C. as shown in FIG. 8 (a).
When it greatly changes, the solar radiation correction signal Tsc as shown in FIG. 8 (c) is formed, and the blowing amount as shown in FIG. 8 (c) gradually decreases based on Tsc. Such a state is when Ts shifts from the auto mode area (A) to the manual mode area (B) via the area (C) in FIG.
Based on step 192, the air distribution door 24 changes to a linear diagram according to the size of _BL up to a position where the opening degree becomes 50%, as indicated by the broken line in FIG. 8D ((3)). See formula).

Looking at the changes in the air flow on the As side and on the Dr side in this process, both sides show that the air flow in the auto mode (for example, 80 m ³ / h on the As side,
Up to 100 m ³ / h) flow rate at which air distribution door has reached 50% opening degree (e.g. 60m ³ / h), Figure 8 (e), changes linearly as shown in the wavy line (f) I do.

Thus, according to the present invention, the air distribution amount is linearly controlled according to B _L, even if the change characteristic pattern of B _L is even but also has advantages capable of suppressing the rapid fluctuation of the air volume is there.

In addition, since the linear control of the air distribution door is started immediately after the solar radiation amount changes from small to large, it can respond to a subtle change in feeling due to the influence of solar radiation without a response delay.

(Effects of the Invention) As described above, according to the present invention, the position of the air distribution door is changed according to the change in the air flow at the switching point when the automatic mode control of the air distribution door is started or stopped. Therefore, the change in the air distribution amount on the left and right sides of the vehicle compartment can be made smooth, and air conditioning control without feeling uncomfortable can be realized.

Further, since the position of the air distribution door can be changed in relation to the change in the air flow, the air flow can be smoothly changed even if the drive control pattern of the air blower is changed.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a schematic block diagram showing an embodiment of an automotive air conditioner according to the present invention, and FIG. 3 is a main routine of a microcomputer used in the automotive air conditioner. FIG. 4 is a flowchart showing the calculation process of the solar radiation direction, FIG. 5 is a flowchart showing the calculation process of the solar radiation amount, FIG. 6 is a diagram showing the characteristic of the solar radiation amount and the solar radiation correction signal, and FIG. Is a diagram showing various characteristics at the time of switching to the automatic mode of the air distribution control, FIG. 8 is a diagram showing various characteristics at the time of canceling the automatic mode of the air distribution control, and FIG. 9 is control of the air distribution door. Flow chart showing the amount calculation process, FIG. 10 is a diagram showing the switching characteristics of the control method,
FIG. 11 is a characteristic diagram showing the relationship between the opening degree of the air distribution door, the solar radiation azimuth and the air distribution lever, and FIG. 12 (a) is a flowchart showing the processing when switching the air distribution door from manual to automatic control. FIG. 12 (b) is a flowchart showing a process at the time of switching the air distribution door from automatic to manual control. 7 Blower, 24 Baffle door, 25 Solar radiation sensor, 20
0: solar radiation correction signal forming means, 210: solar radiation azimuth calculating means, 220: blowing air amount calculating means, 230: blower driving control means, 240 ... determining means, 250: wind distribution door control amount calculating means, 260 ... Air distribution door drive control means.

Claims (1)

(57) [Claims] 1. A solar correction signal forming means for delaying a solar signal detected by a solar sensor to form a solar correction signal, and a solar azimuth calculation for calculating a solar azimuth based on the solar signal detected by the solar sensor. Means, a blowing amount calculating means for calculating a blowing amount based on the solar correction signal formed by the solar correction signal forming means, and a blower driving control means for driving and controlling the blower according to an output of the blowing amount calculating means. Determining means for determining whether or not to control the air distribution door for changing the air volume distribution on the left and right sides of the vehicle compartment in the automatic mode; and at the start of the air distribution control in the automatic mode, the determination is made based on the solar radiation direction calculating means. The position of the actual air distribution door is gradually changed to the target position of the air distribution door according to the output signal from the air volume calculation means, and the air distribution control in the automatic mode is stopped. At this point, an air distribution door control amount calculation unit that calculates a control amount of the air distribution door that gradually changes an actual position of the air distribution door to a predetermined set position in accordance with an output signal from the air flow amount calculation unit, A wind distribution door drive control means for driving and controlling the wind distribution door based on the control amount calculated by the wind distribution door control amount calculation means.