JPH0390429A - Automotive air condition control device - Google Patents

Abstract

PURPOSE:To prevent a blow-off of the hot air and avoid the deterioration of the feeling of crew by switching the blow-off mode in response to a largeness of the quantity of solar radiation or the like, and while restricting switching to the blow-off mode that an upper blow-off port is opened when the required blow-off temperature is high. CONSTITUTION:Control factors including temperature inside/outside of a car room and solar radiation or the like is generated by a means 100. On the other hand, temperature of the blow-off air blown into a car room is adjusted by a means 200, and the blow-off mode of the air of which temperature is adjusted is switched by a means 300. The required blow-off temperature is computed by a means 400 on the basis of the control factors, and the described means 200 is controlled by a first means 500 on the basis of the computed result. Furthermore, the blow-off mode switching signal is computed by a means 600 on the basis of the control factors, and switching to the vent blow-off mode is especially restricted by a means 700 in response to the required blow-off temperature. The described means 300 is controlled by a second means 800 with the blow-off mode selected by the described means 600 to be restricted by the described means 700.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioning control device for an automobile that has improved switching control of blowout modes.

(Prior Art) Solar radiation has a large effect on the thermal sensation of the occupants, and this cannot be ignored in order to provide comfortable air conditioning in the vehicle interior. For this reason, it is desirable to take the amount of solar radiation into consideration when controlling the switching of the blowout mode, and a technique such as that disclosed in Japanese Patent Publication No. 60-21887 is known in the art.

If solar radiation above a predetermined level is detected when the heater mode is selected, the blowout mode is changed to pie level mode, and air is blown out from the vent outlet to relieve the thermal sensation of the occupants due to solar radiation. , which attempts to prevent deterioration of the feeling.

(Problem to be Solved by the Invention) However, according to recent air conditioning controls, the necessary blowout temperature of the air supplied to the vehicle interior is calculated based on the set temperature inside the vehicle interior, the temperature inside the vehicle interior, the outside temperature, the amount of solar radiation, etc. Since the opening degree of the air mix door, that is, the temperature of the blown air, is controlled based on this calculation result, if the blowing mode is simply switched based on the amount of solar radiation, the required blowing temperature will be If the temperature is low, the thermal sensation caused by sunlight can be alleviated by the occupant, but if the necessary blowout temperature is high, hot air is supplied to the upper body of the occupant, causing discomfort.

Generally, when the heater mode is set, the required blowing temperature is quite high, so if the mode is changed from this state to the pie level mode, it is expected that hot air of 30° C. or higher will normally be blown.

Therefore, in this invention, the above-mentioned problems are solved, and the air blowing mode is appropriately switched from both aspects of reducing the thermal sensation of the occupant due to solar radiation and preventing hot air from blowing out from the upper air outlet, thereby improving the comfort of the occupant. An object of the present invention is to provide an air conditioning control device for an automobile that is designed to maintain the air conditioner ring.

(Means for Solving the Problem) The gist of the present invention is, as shown in FIG. , a control factor generating means 100 that includes at least an outside air temperature sensor that detects the temperature outside the vehicle interior, and a solar radiation sensor that detects the amount of solar radiation; a temperature adjustment means 200 that adjusts the temperature of the blown air supplied to the interior of the vehicle; and this temperature adjustment means. a blowout mode switching means 300 that switches the blowout mode of the air whose temperature has been adjusted in step 200; a necessary blowout temperature calculation means 400 that calculates the necessary blowout temperature of the blowout air based on the output of the control factor generating means 100; A first control means 500 that controls the temperature adjustment means 200 based on the calculation result of the hot water temperature calculation means 400, and a calculation of the required blowing temperature based on the output of the control factor generation means 100 based on the output of the solar radiation sensor. a blowout mode switching signal calculation means 600 for calculating a blowout mode switching signal for switching the blowout mode by adding a weight greater than the weight added by the blowout mode switching signal calculation means 600;
a blowout mode limiting means 700 that limits switching to the blowout mode in accordance with the output of the required blowout temperature calculation means 400 when a blowout mode that allows blowout from the vent outlet is selected; and a second control means 800 for controlling the blowout mode switching means 300 according to the blowout mode selected by the blowout mode switching signal calculation means 600 which is limited by the output of the means 700.

(Function) Therefore, the temperature adjustment means is controlled based on the required blowout temperature, but since the blowout mode is controlled by the blowout mode switching signal which increases the gain of the output of the solar radiation sensor, the change in the blowout mode is caused by the change in the blowout temperature. This is done more sensitively to the amount of solar radiation than to any change in temperature. For example, even when heating is required in winter, if the amount of solar radiation increases, the blowing mode can be changed from heat to pie level without changing the blowing temperature significantly. Can be transferred to Karavent. Moreover, since the blowing of air from the upper outlet is limited according to the required blowing temperature, even if the airflow mode that allows air to be blown out from the upper outlet is selected by the blowout mode switching signal calculation means due to increased solar radiation, When the required blowing temperature is high, the blowing mode is not switched, and there is no possibility that hot air will be blown onto the occupant. Therefore, the above-mentioned problem can be achieved.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In Figure 2, the automotive air conditioning control device is an air conditioning duct)
An intake door switching device 2 is provided on the most upstream side of 1,
In this intake door switching device 2, an intake door 5 is arranged at a part where an inside air population 3 and an outside air population 4 are separated, and by operating this intake door 5 with an actuator 6, the air introduced into the air conditioning duct 1 is changed from inside air to inside air. and outside air.

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

The evaporator 8 has a compressor 10. capacitor 11
, liquid tank 12 and expansion valve 13
The compressor 10 is connected to the engine of the automobile via an electromagnetic clutch 15, and is turned on and off by connecting and connecting the electromagnetic clutch 15. Further, engine cooling water circulates through the heater core 9 to heat the air. An air mix door 16 is provided in front of the heater core 9, and by adjusting the opening degree of the air mix door 16 using an actuator 17, the amount of air passing through the heater core 9 and air bypassing the heater core 9 can be adjusted. As a result, the temperature of the blowing air is controlled.

The downstream side of the air conditioning duct 1 is divided into a defrost outlet 18, a vent outlet 19, and a heat outlet 20, which open into the vehicle interior 21, and a mode door 2 is provided in the divided part.
2a, 22b are provided, and the mode doors 22a, 22
A desired blowing mode can be obtained by operating the actuators 23 and 24.

The actuators 6.17 and 23.degree. 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. This microcomputer 26 is of a well-known type having a central processing unit (not shown), a read-only memory ROM, a random access memory RAM, a passenger capo (not shown), etc. The microcomputer 26 detects the temperature inside the vehicle. The vehicle interior temperature TR from the vehicle interior temperature sensor 27, the outside air temperature TA from the outside air temperature sensor 28 that detects the outside air temperature, the solar radiation amount Qs from the solar radiation sensor 29 that detects the amount of solar radiation, etc. are selected via the multiplexer 30. , and is converted into a digital signal and input via the A/D converter 31.

Further, an output signal from the operation panel 34 is input to the microcomputer 26 . This operation panel 34 includes an A/C switch 35 that sets all air conditioning equipment such as blowers to auto mode when the compressor is running, an EC0N switch 36 that performs economical operation, an OFF switch 37 that commands a stop mode, and an air conditioning duct (inside the air conditioning duct) 1. An intake switch 38 that switches the air taken into the vehicle between internal air intake (REC) and outside air intake (FRESH), a differential switch 39 that sets the blowout mode to defrost mode, a temperature setting device 40 that sets the temperature inside the vehicle, and air blowing capacity. The air blowing capacity setting device 41 is provided to set the air blowing capacity setting device 41, and the blowing mode setting device 42 is provided to manually set the blowing mode other than the defrost mode.

The temperature setting device 40 is an up/down switch 43a.

43b and a temperature display section 44 that digitally displays the set temperature, and an up/down switch 43a.

43b, the set temperature T0 is displayed on the temperature display section 44.
can be changed within a predetermined range, and includes the vehicle interior temperature sensor 27, outside air temperature sensor 28, and solar radiation sensor 29.
Together with the above, it constitutes a control factor generating means.

The fan capacity setting device 41 also includes a FAN switch 45 that switches the rotation level of the blower 7 and a level display section 46 that displays the current rotation level.
Operation 5 stops the ventilation capacity mode (level O), LO
W (Level 1), MID (Level 2), HI (Level 3)
), MAX HI (level 4), and "MANUAL" is displayed at the top of the level display section 43.
” will light up.

Furthermore, the mode setting device 42 sets the blowout mode (pen) (V
ENT), Ba4! /Bare L/ (B/L), heat (D/F 1 ), and a pictorial display section 48 that displays the current blowout mode with a pictorial display. The airflow arrows 48a and 48b on the pictorial display section 48 are lit to indicate the selected blowout mode, and the word "MANUAL" is lit at the top of the pictorial display section 4. .

Incidentally, these lighting displays and the displays on each of the display sections 44, 46, and 48 are controlled by the microcomputer 26 via a display circuit 49.

In FIG. 3, an example of a control routine for the air conditioner by the microcomputer 26 described above is shown as a flowchart. Input the output signal from. Then, in the next step 54, it is determined whether the OFF switch 37 of the operation panel 35 has been pressed,
If it is determined that the OFF switch 37 has been pressed, the process advances to step 76 and the blowing mode is changed to the heat mode (D/F
1), 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 set temperature TD, the vehicle interior temperature T
R1 Based on the outside air temperature TA and the amount of solar radiation Qs, the target blowing temperature XM is calculated according to (1) 2.

X H=A-T o B-T * C-T a
D-Q S + E (1) However, A, B, C, and D are gains added to each signal, and E is a correction term.

Then, in the next step 5th day, the step 54
The target opening degree θ of the air mix door 16 is calculated based on the predetermined pattern shown in FIG.
to adjust the blowout temperature. Note that when the air mix door 16 is in the 1 position in Fig. 2, it is FULL.
It is in the HOT state and is in the ■ position when it is FULL C
It is in a state of 00L.

Next, in step 62, it is determined whether the mode switch 47 or the differential switch 39 has been pressed to manually select the blowout mode. In step 62, if the mode switch 47 or the three differential switches are pressed (YES), the process proceeds to step 64, where it is determined whether or not the vent mode has been selected, and if the vent mode has been selected. If it is determined, the process advances to step 66 and the mode doors 22a, 22b are set to vent mode. If a blowout mode other than the vent mode is selected, the process proceeds from step 64 to step 68 to determine whether the selected blowout mode is the pie level mode, and if it is the pie level mode, the process proceeds to step 70. The mode doors 22a and 22b are set to the pie level mode position. If it is determined in step 68 that a blowout mode other than pie level mode is selected, the process advances to step 72 and the blowout mode is set to heat mode (D/F
1) is selected, and if heat mode is selected, the process advances to step 76 and mode door 2 is selected.
2a, 22b to the heat mode position, otherwise proceed to step 74 and set the mode doors 22a, 2-2 to the heat mode position.
Set b to the defrost mode position.

On the other hand, if the blowing mode is automatically controlled in step 62, the process proceeds to step 78, where a weight K is added to the solar radiation amount Qs so as to obtain a predetermined characteristic pattern shown in FIG. 5, for example, and K-Qs Calculate. Then, in the next step 80, the blowout mode switching signal XN is calculated based on equation (2), and XN=A-Tll-B-TR-C,
TA- to -QS+E (2) In step 82, the blowing mode is selected based on this XN so as to have a predetermined pattern shown in FIG.

Here, a value larger than the weight IDI added to Qs of xN is used as the weight IK+ of Qs, so that even a slight change in Qs causes a large change in X9. . Therefore, if the solar radiation IQS increases, the blowout mode will shift from the differential foot mode (including D/F 1 of the heat mode) to the pie level mode, or from the pie level mode to the vent mode, regardless of the required blowout temperature XH. A blowout mode is selected in which a part or all of the vent outlet 19 is opened to increase the amount of air blown directly to the occupant, thereby alleviating the thermal sensation caused by sunlight.

After the blowout mode is selected in step 82, the process proceeds to step 84 to determine whether the selected blowout mode is the differential foot mode, and if the selected blowout mode is the differential foot mode, the process proceeds to step 86. In this step 86, the outside air temperature TA
It is determined whether or not the temperature is higher than a predetermined temperature α, β, and if the temperature is higher than a predetermined temperature, a defrost mode (D/F 1 ) in which the air volume from the defrost outlet is small is set (step 76); If the temperature is below a predetermined temperature, a defrost foot mode (D/F2) is set in which the air distribution ratio to the defrost outlet 18 is increased somewhat to prevent fogging of the window glass (step 88).

If a blowing mode other than the differential foot mode is selected, the process moves from step 84 to step 90, where it is determined whether the selected mode is the pie level mode, and if it is the pie level mode ( YES) Step 9
If it is the vent mode (NO), the process proceeds to step 94. In these steps 92 and 94, even if the blowout mode (pie level mode, vent mode) that allows blowout from the vent outlet 19 is selected in step 82, the airflow from the vent outlet 19 is controlled according to the required blowout temperature XM. A process is performed to limit the blowing of air.

That is, the blowing mode selected in step 82 is determined from the viewpoint of alleviating the thermal sensation caused by sunlight, and is not selected based on the temperature of the blowing air. For this reason, even if the necessary blowout temperature X is high, if the amount of solar radiation QS becomes large, the vent outlet 19 will be opened and hot air will be blown onto the occupant. Therefore, in step 92.94, X, 4 is set to a predetermined value (1, II or III, IV).
If less than or equal to, step 92 to step 96;
Alternatively, the process proceeds from step 94 to step 98, and the pie level mode or vent mode selected in step 82 is set as is, but if X and 4 are greater than or equal to a predetermined value, the pie level mode is selected in step 82. If the mode is selected, the mode is switched to the differential foot mode, and if the vent mode is selected, the mode is switched to the pie level mode.

Note that the switching temperature in step 92.94 is I<n,
Under the conditions of I[I<IV, I is around 20''C, ■ is around 25°C, ■ is around 21''C, and ■ is around 26°C.

(Effects of the Invention) As described above, according to the present invention, the air outlet mode can be switched sensitively depending on the amount of solar radiation, and the air outlet mode can be switched to the air outlet mode in which the upper air outlet is open. Since the required airflow temperature is limited when the required airflow temperature is high, when the required airflow temperature is low, the thermal sensation of the occupant due to solar radiation can be alleviated by blowing air from the upper air outlet, and the necessary When the blowout temperature is high, hot air is prevented from blowing out from the upper blowout port, thereby avoiding deterioration of the passenger's feeling, and the comfortable feeling of the passenger is always maintained.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing this invention, Fig. 2 is a constituent country of an automobile air conditioning control device showing an embodiment of this invention, and Fig. 3 is a control of a microcomputer used in the automobile air conditioning control device in the same embodiment. A flowchart showing a routine example, Figure 4 shows the target opening degree θ of the air mix door.
Figure 5 is a diagram showing the characteristics of the calculation term (K-Qs) with weight added to the amount of solar radiation, Figure 6 is a diagram showing the relationship between the blowout mode switching signal and the blowout mode. It is a characteristic line diagram. 19... Vent outlet, 27... Vehicle interior temperature sensor, 28... Outside air temperature sensor, 29... Solar radiation sensor,
40...Temperature setting device, 100...Control factor generation means, 200...Temperature adjustment means, 300...Blowout mode switching means, 4eO...Required blowout temperature calculation means, 500
...first control means, 600. ...Blowout mode switching signal calculation means, 700...Blowout mode limiting means, 800... Second control means. Patent Applicant: Diesel Machinery Co., Ltd. No. 6 Figure 9 430 i-'y・ RXN ("C)

Claims (1)

[Claims] A control factor that includes at least a temperature setting device that sets the temperature inside the vehicle, a temperature sensor that detects the temperature inside the vehicle, an outside temperature sensor that detects the temperature outside the vehicle, and a solar radiation sensor that detects the amount of solar radiation. a generating means, a temperature adjusting means for adjusting the temperature of the blown air supplied into the vehicle interior, a blowing mode switching means for switching the blowing mode of the air whose temperature has been adjusted by the temperature adjusting means, and an output of the control factor generating means. a first control means for controlling the temperature adjusting means based on a calculation result of the necessary blowout temperature calculation means; a blowout mode switching signal calculating means for calculating a blowout mode switching signal for switching the blowout mode by adding a weight greater than the weight added in the calculation of the required blowout temperature to the output of the solar radiation sensor based on the output; and the blowout mode. Blowout mode limiting means for restricting switching to the blowout mode in accordance with the output of the required blowout temperature calculation means when a blowout mode that allows blowout from the vent outlet is selected by the switching signal calculation means; and second control means for controlling the blowout mode switching means according to the blowout mode selected by the blowout mode switching signal calculation means which is limited by the output of the mode limiting means.