JPH0698888B2 - Air conditioning controller for automobile - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioning control device for an automobile with improved blowout mode switching control.

(Prior Art) The effect of solar radiation on the passenger's thermal sensation is large, and this cannot be ignored in order to provide comfortable vehicle air conditioning. For this reason, it is desirable to consider the amount of solar radiation when controlling the switching of the blowing modes, and as such a technique, for example, the technique disclosed in Japanese Patent Publication No. 60-21887 has been conventionally known.

This is to correct the blowing mode to the bi-level mode when solar radiation above a certain level is detected when the heater mode is selected, and to soften the passenger's thermal sensation due to solar radiation by blowing air from the vent outlet. , To prevent the feeling from deteriorating. The publication also discloses that the correction from the heater mode to the bilevel mode is limited when the blowout temperature is equal to or higher than a predetermined temperature.

(Problems to be Solved by the Invention) However, according to the recent air conditioning control, the necessary blowout temperature of the outside air to be supplied to the inside of the vehicle is calculated based on the set temperature inside the vehicle, the temperature inside the vehicle, the outside air temperature, the amount of solar radiation, etc. Since the opening of the air mix door, that is, the temperature of the blown air is controlled based on this calculation result, if the required blowout temperature is low if the blowout mode is simply switched only by the magnitude of the amount of solar radiation. Although the thermal sensation of the occupant due to the solar radiation can be softened, when the required blowing temperature is high, hot air is supplied to the upper half of the occupant's upper body, which rather causes discomfort. Generally, when the heater mode is set, the required blowout temperature is considerably high. Therefore, if the mode is changed to the bi-level mode, hot air blowout of 30 ° C or higher is normally expected. In this respect, in the above-mentioned conventional technique, since the change from the heater mode to the bi-level mode is limited when the blowout temperature is equal to or higher than a predetermined temperature,
Although it is possible to suppress the blowing of hot air to the upper half of the body, the interior of the vehicle generally has a characteristic that it is easy to warm up and hard to cool down. If the amount of solar radiation is reduced and the upper outlet is closed immediately, there is a risk that sufficient heat air cannot be dissipated.

In view of the above, in the present invention, the above-mentioned problems are solved, and switching of the blowing mode is appropriately performed from both sides of reducing the thermal sensation of the occupant due to solar radiation and preventing the blowing of hot air from the upper outlet, and it is easy to heat and difficult to cool. An object of the present invention is to provide an air conditioning control device for an automobile, which is designed to maintain a sensible feeling for passengers in accordance with vehicle characteristics.

(Means for Solving the Problem) The gist of the first invention is, as shown in FIG. 1, a temperature setter for setting the temperature in the vehicle interior, and a vehicle interior for detecting the temperature in the vehicle interior. A temperature sensor, an outside air temperature sensor that detects the temperature outside the passenger compartment, a control factor generating means 100 including at least a solar radiation sensor that detects the amount of solar radiation, a temperature adjusting means 200 that adjusts the temperature of the blown air supplied to the passenger compartment, and this temperature. A blowing mode switching means 300 for switching the blowing mode of the air whose temperature is adjusted by the adjusting means 200, a necessary blowing temperature calculating means 400 for calculating the necessary blowing temperature of the blowing air based on the output of the control factor generating means 100, and The temperature adjusting means 2 based on the calculation result of the required outlet temperature calculating means 400
Based on the output of the first control means 500 for controlling 00 and the control factor generation means 100, a weight larger than the weight added in the calculation of the required blown air temperature is added to the output of the solar radiation sensor, and A blowing mode switching signal calculation means 600 for calculating a blowing mode switching signal for switching the blowing mode by increasing the value weighted to the output of the solar radiation sensor when the amount of solar radiation is decreasing than when increasing the amount of solar radiation, and the blowing mode switching signal. When a blowing mode that allows blowing from the vent outlet is selected by the computing means 600, switching to the blowing mode is requested when the required blowing temperature is equal to or lower than a predetermined value, and the required blowing temperature is a predetermined value. If it is more than the above, the blowing mode control means 700 for requesting switching to the blowing mode for suppressing the blowing amount from the vent outlet rather than the selected blowing mode, In that a second control means 800 for controlling the blowing mode switching means 300 so that the blow-out mode is requested by the output mode limit unit 700.

Further, the gist of the second invention is that the weight of the output of the solar radiation sensor added by the blowing mode switching signal calculation means 600 is small when the amount of solar radiation is small and the amount of solar radiation is small when the amount of solar radiation is small. When it is big, it is to make it big.

(Operation) Therefore, according to the first aspect of the invention, the temperature adjusting means 200 is controlled based on the required outlet temperature, but the outlet mode is controlled by the outlet mode switching signal in which the gain of the output of the solar radiation sensor is increased. The change in the blowing mode is more sensitive to the amount of solar radiation than the change in the blowing temperature.For example, even when heating is required in winter, if the amount of solar radiation increases, the blowing temperature does not change greatly It is possible to change the mode from heat to bilevel and from bilevel to vent. Moreover, since the blowing of the air from the upper outlet is restricted according to the required outlet temperature, even if the blowing mode that allows the blowing from the upper outlet due to the increased solar radiation is selected by the blowing mode switching signal calculation means 600. When the required blowout temperature is high, the blowout mode is not switched, and there is no fear that hot air will be blown to the occupant. Further, the temperature control means 200 is controlled based on the required outlet temperature,
The blowout mode is controlled by a switching signal in which the value weighted by the output of the solar radiation sensor becomes larger when the amount of solar radiation decreases than when it increases, so the temperature inside the vehicle compartment is generally warm and difficult to cool. When the amount is in the decreasing direction, the switching of the blowing mode is delayed and the hot air trapped in the vehicle compartment can be sufficiently dissipated.

According to the second aspect of the invention, when the amount of solar radiation is small when the amount of solar radiation is increasing, the amount of hot air that is sensed by the solar radiation is not so large, so the weight added to the output of the solar radiation sensor is reduced and the air is blown unnecessarily. To prevent the mode from changing,
When the amount of solar radiation is large when the amount of solar radiation is increased, the amount of hot air sensed by the solar radiation is large, so the weight added to the output of the solar radiation sensor is increased and the change of the blowing mode is positively considered.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, an air conditioning controller for a vehicle is provided with an intake door switching device 2 on the most upstream side of an air conditioning duct 1.
In this intake door switching device 2, an intake door 5 is arranged at a portion where an inside air inlet 3 and an outside air inlet 4 are separated. By operating the intake door 5 with an actuator 6, the air introduced into the air conditioning duct 1 is released into the inside air. And you can choose to open air.

The blower 7 sucks air into the air conditioning duct 1 and blows the air downstream, and an evaporator 8 and a heater core 9 are provided behind the blower 7.

The evaporator 8 is connected with a compressor 10, a condenser 11, a liquid tank 12 and an expansion valve 13 to form a cooling cycle, and the compressor 10 is connected to an engine of an automobile through an electromagnetic clutch 15 and this electromagnetic clutch On and off is controlled by continuing 15. The heater core 9 is adapted to circulate engine cooling water to heat air. An air mix door 16 is provided in front of the heater core 9, and the opening degree of the air mix door 16 is controlled by an actuator 17
The amount of the air passing through the heater core 9 and the amount of the air bypassing the heater core 9 are changed by the adjustment by, and as a result, the temperature of the blown air is controlled.

The downstream side of the air conditioning duct 1 is a defrost outlet.
18, Vent air outlet 19 and Heat air outlet 20
21. Mode doors 22a, 22b are provided in the divided portion, and the mode doors 22a, 22b are connected to the actuators 23, 22b.
By operating at 24, the desired blowout mode can be obtained.

The actuators 6, 17, 23, 24, the motor 7a of the blower 7, and the electromagnetic clutch 15 of the compressor 10 are controlled based on output signals from the microcomputer 26 via drive circuits 25a to 25e, respectively.

The air mix door 16 and the actuator 17 constitute the temperature adjusting means 200, and the mode doors 22a and 22b and the actuators 23 and 24 constitute the blowout mode switching means 300.

The microcomputer 26 is a central processing unit not shown.
CPU, read-only memory ROM, random access memory RA
M, an input / output port I / O, and the like, which are known per se, and the microcomputer 26 includes an outside air temperature sensor T _R from the inside temperature sensor 27 and an outside air temperature sensor for detecting the outside air temperature.
The outside air temperature T _A from 28, the solar radiation amount Qs from the solar radiation sensor 29 that detects the solar radiation amount, etc. are selected via the multiplexer 30,
It is converted into a digital signal via the A / D converter 31 and input.

An output signal from the operation panel 34 is input to the microcomputer 26. This operation panel 34 is for A / C switch 35 that sets all air conditioners such as blowers to the automatic state when the compressor is in operation, ECON switch 36 that performs economical operation, OFF switch 37 that commands a stop mode, and inside the air conditioning duct 1. An intake switch 38 that switches the intake air to internal air intake (REC) and external air intake (FRESH), a diff switch 39 that sets the blowout mode to the defrost mode,
A temperature setting device 40 for setting the temperature in the vehicle compartment, a blowing capacity setting device 41 for setting the blowing capacity, and a blowing mode setting device 42 for manually setting the blowing modes other than the defrost mode.

The temperature setter 40 comprises up / down switches 43a, 43b and a temperature display section 44 for digitally displaying the set temperature. By operating the up / down switches 43a, 43b, the set temperature T _D shown on the temperature display section 44 can be set within a predetermined range. The control factor generating means 100 is configured together with the vehicle interior temperature sensor 27, the outside air temperature sensor 28, the solar radiation sensor 29, and the like.

Further, the blower capacity setting device 41 includes a FAN switch 45 for switching the rotation level of the blower 7 and a level display section 46 for displaying the current rotation level, and the operation of the FAN switch 45 stops the blower capacity mode (level 0). ), LOW (level 1), MID (level 2), HI (level 3), MAX HI (level 4) are switched in this order, and the word "MANUAL" lights up at the top of the level display 43. It has become.

In addition, the mode setter 42 changes the blowing mode to vent (VEN
T), bi-level (B / L), heat (D / F1) in order, mode switch 47 and picture display section 48 showing the current blowout mode as a picture display. The air flow arrows 48a and 48b of the picture display section 48 are lit to indicate the selected blowing mode, and at the same time, the picture display section
The letters "MANUAL" are lit up at the top of 48.

The lighting display and the display of the display units 44, 46, 48 are controlled by the microphone computer 26 via the display circuit 49.

In FIG. 3, an example of the control routine of the air conditioner by the microcomputer 26 described above is shown as a flow chart, and the microcomputer 26 starts the execution of this program from step 50, and outputs the various sensors and the operation panel 35 at step 52. Input the signal. And
In the next step 54, it is determined whether or not the OFF switch 37 of the operation panel 35 is pressed. If it is determined that the OFF switch 37 is pressed, the process proceeds to step 76 and the blowout mode is set to the heat mode (D / F1 ), The air conditioning control is stopped, and if it is determined that the OFF switch 37 is not pressed, the process proceeds to step 56.

In step 56, the target outlet temperature X _M is calculated according to the equation (1) based on the set temperature T _D , the vehicle interior temperature T _R , the outside air temperature T _A, and the solar radiation amount Qs.

_{X M = A · T D -B} · T R -C · T A -D · Qs + E ... (1) where, A, B, C, D is the gain added to each signal, E
Is a correction term. It should be noted that this step 56 constitutes the necessary outlet temperature calculation means 400.

Then, in the next step 58, the target opening θ of the air mix door 16 is calculated from the predetermined pattern shown in FIG. 4 based on X _M obtained in the step 54, and in step 60, this target opening θ The air mix door 16 is driven to adjust the blowout temperature. It should be noted that when the air mix door 16 is at the I position in FIG. 2, it is the FULL HOT state, and II
When in the position, it is in the FULL COOL state. The steps 58 and 60 and the drive circuit 25b constitute the first control means 500.

Next, in step 62, it is determined whether the mode switch 47 or the differential switch 39 has been pressed to manually select the blowing mode. In this step 62, when the mode switch 47 or the differential switch 39 is pressed (YE
In S), proceed to step 64 to determine whether or not the blowing mode is selected as the vent mode. If it is determined that the vent mode is selected, proceed to step 66 and vent the mode doors 22a and 22b. Set to mode. Step 64 if a blowout mode other than vent mode is selected
To step 68, it is determined whether or not the selected blowing mode is the bi-level mode. If it is the bi-level mode, the procedure goes to step 70 to set the mode doors 22a and 22b to the bi-level mode position. When it is determined in step 68 that the blowing mode other than the bi-level mode is selected, the process proceeds to step 72, it is determined whether the blowing mode is the heat mode (D / F1), and the heat mode is selected. If it is selected to, proceed to step 76 and the mode door 22
Set a and 22b to the heat mode position, and if not, proceed to step 74 to set the mode doors 22a and 22b to the defrost mode position.

On the other hand, when the blowout mode is automatically controlled at step 62, the routine proceeds to step 78, where the weight K according to the first invention is added and K · Qs is calculated. Then, the blow mode switching signal X _N (2) on the basis of the equation is calculated in the next step _{80, X N = A · T} D -B · T R -C · T A -D · Qs + E ... (2) Step At 82, the blowing mode is selected based on this X _N so that the predetermined pattern shown in FIG. 6 is obtained. Here, as the weight | K | of Qs, a value larger than the weight | D | added to Qs of X _N is used, and even if a slight change in Qs results in X _N
Is changing drastically. And the amount of solar radiation
If Qs becomes large, the blowout mode shifts from differential foot mode (including heat mode D / F1) to bilevel mode, or from bilevel mode to vent mode, regardless of the required blowout temperature X _M. A blowing mode is selected in which a part or all of the air is opened to increase the amount of air blown directly to the occupant, and the thermal sensation due to solar radiation is softened.

The weight added to Q _S at step 78 according to the second invention, as shown in FIG. 5, the gradient for the change in direction of solar radiation Q _S increases, the Nakara range of the chromatic ( In the range of (gain) is medium, the change in the hot air that is felt due to insolation at the time of light cloudiness is not so large. Therefore, in the range where the gain (gain) is small, in the range of direct sunlight, Since it is large, the slope (gain) is large.
And, in the direction of decreasing the amount of solar radiation Q _S, there is a hysteresis from to, and in the range of, the slope to maintain a large K · Q _S value in consideration of the hot air pool after strong solar irradiation. (Gain) is small, and in the range of, the weight K is added in consideration of the hot air pool with or without solar radiation, the slope is small, and the continuity in control is taken into consideration. Calculate K · Q _S. And above step 80
The following operation is performed to delay the switching of the blowout mode in the decreasing direction according to the temperature characteristic of the room where it is easy to warm up and difficult to cool down, and the hot air in the vehicle interior can be sufficiently dissipated.

After the blowing mode is selected in step 82, step 84
Go to and determine whether the selected blowing mode is the differential foot mode, and if it is the differential foot mode, step
Continue to 86. In step 86, it is determined whether the outside air temperature T _A is equal to or higher than the predetermined temperatures α and β, and if the temperature is equal to or higher than the predetermined temperature, a diff foot mode (D / F1) is set in which the air volume is small from the defrost outlet, which is usually performed. If the temperature is lower than the predetermined temperature (step 76), the diff foot mode (D / F2) is set so that the air distribution ratio to the defrost outlet 18 is slightly increased to prevent the fogging of the window glass. (Step
88). When the blowing mode other than the differential foot mode is selected, the routine proceeds from step 84 to step 90, it is judged whether or not the mode selected here is the bi-level mode, and if it is the bi-level mode ( YES) Step 92
If the vent mode is selected (NO), the process proceeds to step 94. In these steps 92 and 94, even if the blowout mode (bi-level mode, vent mode) that allows blowout from the vent outlet 19 is selected in step 82, the required blowout temperature is required.
A process of restricting the blowing of air from the vent outlet 19 is performed according to X _M. That is, the blowing mode selected in step 82 is determined from the viewpoint of softening the thermal sensation due to solar radiation, and is not selected based on the temperature of the blown air. Therefore, if the amount of solar radiation Qs becomes large even if the required outlet temperature X _M is high, the vent outlet 19 is opened and hot air is blown to the occupant. So, steps 92,9
If X _M is less than or equal to the predetermined value (I, II or III, IV) in step 4, proceed from step 92 to step 96 or from step 94 to step 98 and select the bilevel mode or vent mode selected in step 82. Is set as it is, but when X _M is equal to or more than the predetermined value, it is switched to the differential foot mode if the bi-level mode is selected in step 82, or to the bi-level mode if the vent mode is selected. Processing is performed.

The switching temperatures in steps 92 and 94 are I <II, III <I
Under conditions like V, I is around 20 ° C, II is around 25, III is 21
The IV is around 26 ° C.

Then, as shown in FIG. 5, a weight is added to Qs (step 78), and this is used as a part of the calculation factor to calculate the mode switching signal (X _N ) based on the mathematical expression (equation (2)) shown in step 80. ) And based on the magnitude of this X _N step 82
The blowing mode switching signal calculation means 600 is constituted by a series of processes for selecting the blowing mode in (1).

In addition, in step 82, a mode that allows blowing from the vent outlet (bi-level mode (B / L), vent mode (VEN
T)) is selected, in steps 92 and 94, the magnitude of the required outlet temperature (X _M ) calculated in step 56 is taken into consideration, and the selected mode is activated or more venting is performed. It is determined whether to change to the blowing mode that suppresses the blowing amount from the exit. If it cools, the bi-level mode (B /
Assuming that L) is selected in step 82, the required outlet temperature (X _M ) is set to a predetermined value (I, II) in step 92.
If so, step 76 through step 92 or step 86 to avoid blowing hot air to the upper body or
When the D / F mode is changed to 88 and X _M is equal to or smaller than the predetermined value (I, II), the process proceeds to step 96 so that the B / L mode selected in step 82 is set. Further, assuming that the vent mode (VENT) is selected in step 82, the required outlet temperature (X _M ) is set to the predetermined value (III, IV) in step 94.
If it is above, the blowout mode is B / L via step 92 etc.
Mode (step 96) or D / F mode (steps 76, 8)
If it is changed to 8) and X _M is equal to or less than the predetermined value (III, IV), the process proceeds to step 98 and the blowout mode is set to the VENT mode selected in step 82. Thus, step 92,
If the temperature of air blown from the vent outlet is low, 94 requests switching to the blowout mode selected in step 82, and if the temperature of the blown air is high, requests to switch to a mode in which the upper body blowout amount is suppressed. The mode limiting means 700 is configured.

The drive circuit 25c drives and controls the mode door so that the blowout mode determined through the processing of steps 92 and 94 is set. Therefore, the second step is performed by the drive circuit 25c by the steps 76, 88, 96, 98. The control means 800 is configured.

(Effect of the Invention) As described above, according to the first aspect of the invention, the switching of the blowing mode is performed sensitively according to the magnitude of the amount of solar radiation, while the switching to the blowing mode in which the upper outlet is opened. Since the switching of is restricted when the required outlet temperature is high, when the required outlet temperature is low, the thermal sensation of the occupant due to solar radiation can be softened by the air outlet from the upper outlet, When the required blowing temperature is high, the blowing of hot air from the upper outlet can be prevented to prevent the passenger's feeling from deteriorating, and the passenger's comfortable feeling is always maintained.

Further, the blowout mode switching signal is calculated by weighting the output of the solar radiation sensor to be larger when the amount of solar radiation decreases than when increasing the amount of solar radiation, so that it is adjusted to the temperature characteristics in the passenger compartment where it is easy to warm up and difficult to cool down. Then, in the direction of decreasing the solar radiation, the switching of the blowing mode can be delayed so that the interior of the vehicle can be sufficiently cleared.

According to the second aspect of the invention, in addition to the above effect, the weight added to the output of the solar radiation sensor becomes small when the amount of solar radiation that is felt is not so great even when the amount of solar radiation increases. It suppresses unnecessary change of the non-exit mode, and conversely, when the hot air that is sensed by solar radiation is large, the weight added to the output of the solar radiation sensor becomes large, so the change of the blowing mode is positively considered. Thus, the blowing mode control with a better feeling is realized.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a block diagram of an automobile air conditioning control device showing an embodiment of the present invention, and FIG. 3 is a control of a microcomputer used in the automobile air conditioning control device. FIG. 4 is a flowchart showing a routine example, and FIG. 4 is a target opening θ of the air mix door.
5 is a characteristic diagram showing a control example of FIG. 5, FIG. 5 is a diagram showing a characteristic of an arithmetic term (K · Qs) in which a weight is added to the amount of solar radiation, and FIG. 6 is a relation between a blowing mode switching signal and a blowing mode. It is a characteristic diagram. 19 …… Vent outlet, 27 …… In-cabin temperature sensor, 28 ……
Outside air temperature sensor, 29 ... solar radiation sensor, 40 ... temperature setting device, 100 ... control factor generating means, 200 ... temperature adjusting means,
300 ... Blowout mode switching means, 400 ... Necessary blowout temperature calculating means, 500 ... First control means, 600 ... Blowout mode switching signal calculating means, 700 ... Blowout mode limiting means, 800 ... Second Control means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikutaro Noji 560-2 Okazu Furuhisa, Atsugi-shi, Kanagawa Nissan Motor Co., Ltd. Technical Center (56) Reference Japanese Patent Publication Sho 60-21887 (JP, B2)

Claims (2)

[Claims] 1. A control factor generator including at least a temperature setter for setting a temperature in a vehicle compartment, a vehicle interior temperature sensor for detecting a vehicle interior temperature, an outside air temperature sensor for detecting a vehicle exterior temperature, and a solar radiation sensor for detecting a solar radiation amount. Means, temperature adjusting means for adjusting the temperature of the blown air supplied to the vehicle interior, blowout mode switching means for switching the blowout mode of the air whose temperature is adjusted by the temperature adjusting means, and based on the output of the control factor generating means. Required blowout temperature calculation means for calculating the required blowout temperature of the blown air, first control means for controlling the temperature adjusting means based on the calculation result of the required blowout temperature calculation means, and output of the control factor generation means Based on the above, a weight greater than the weight added in the calculation of the required blown air temperature is added to the output of the solar radiation sensor, and the output of the solar radiation sensor is weighted. A blowout mode switching signal calculating means for calculating a blowout mode switching signal for switching the blowout mode by increasing the value when the amount of solar radiation decreases more than when the amount of solar radiation increases, and the blowout from the vent outlet by the blowout mode switching signal calculation means. When a blowing mode that allows the above is selected, switching to the blowing mode is requested when the required blowing temperature is equal to or lower than a predetermined value, and when the required blowing temperature is equal to or higher than the predetermined value, the selected blowing mode is selected. And a second control means for controlling the blowout mode switching means so as to be in the blowout mode requested by the blowout mode limiting means, and a blowout mode limiting means for requesting switching to a blowout mode for suppressing the blowout amount from the vent outlet. An air conditioning control device for a vehicle, comprising: 2. When increasing the amount of solar radiation, when the amount of solar radiation detected by the solar radiation sensor is small, the weight added to the output of the solar radiation sensor is reduced, and when the amount of solar radiation detected by the solar radiation sensor is large. The vehicle air conditioning control device according to claim 1, wherein the weight added to the output of the solar radiation sensor is increased.