JPH01190521A - Automobile air-condition control device - Google Patents

Abstract

PURPOSE:To enhance the effect of air-condition by determining a blow-out mode excepting such a mode that air is blow off from a foot blow-out port when the outside air temperature and the passenger compartment upper part temperature are relatively high so as to eliminate warm air stagnating in the vicinity of the overhead section of the passenger compartment. CONSTITUTION:A means 100 computes a blow-out mode change-over signal in accordance with temperatures of air blown off from an evaporator, which are detected by detectors 8, 25, and an opening degree of an air-mix door. Meanwhile if the outside temperature detected by a detector 31 is at a predetermined temperature and a passenger compartment upper part temperature detected by a detector 29 is below a predetermined temperature, a means 101 determines a blow-out mode including such a mode that air is blow off from at least a foot blow-out port. Further, if the outside temperature is at the predetermined temperature and the passenger compartment upper part temperature is above the predetermined value, a means 102 determines another mode excepting such a mode that air is blown off from the foot side blow-out port. Further, a means 103 drives mode doors 14a-14c in accordance with a result of determination concerning these modes.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an air conditioner used in a vehicle such as an automobile, and particularly to blowing mode control.

(Prior Art) Examples of automatic control of switching the blowout outlet, so-called automatic control of switching the blowout mode, include Japanese Utility Model Publication No. 54-31704 and Japanese Patent Publication No. 59-19849.

As such an automatic control device, for example, the
In the publication No. 9849, the target blowout air temperature Tt is calculated by assembling room temperature, outside temperature, set temperature, etc. into a predetermined calculation formula. The target blowing air temperature Tt is sequentially switched to vent, pie level, and heat from a small direction to a large direction, and when the target blowing air temperature Tt becomes large, the blowing mode is switched to heat mode and warm air is blown from the feet. It had been.

(Problem to be solved by the invention) For this reason, when the outside air is around 10°C to 20°C in the middle of spring and autumn and there is sunlight, the temperature near the head (upper part of the vehicle interior) is relatively high. The temperature at the feet is low, so the heat mode is selected from the calculation formula, and air blowing control starts to blow hot air from the feet.

However, the wind is no longer circulating near the head, resulting in traffic congestion, and the high temperature near the head (haze) is -
However, there was no improvement in the air conditioner's direction, and the air conditioner had the disadvantage of not having a good feeling.

Therefore, in view of the above-mentioned drawbacks, it is an object of the present invention to quickly improve the temperature conditions when the temperature above the vehicle interior is relatively high.

(Means for Solving the Problems) Means for solving the problems in this invention are as shown in FIG.

A blowout mode signal calculating means 100 that calculates a blowout mode switching signal from heat load information of the vehicle, an outside air temperature detector 31 that detects the outside air temperature, and a vehicle interior upper temperature detector 29 that detects the upper temperature of the vehicle interior. A first method for determining a blowout mode including a mode in which air is blown out from at least the footwell outlet when the outside air temperature is determined to be a predetermined temperature and the upper temperature in the vehicle interior is determined to be less than a predetermined temperature.
a second air blowing mode determining means 101 for determining air blowing modes other than the mode in which air is blown from the foot outlet when it is determined that the outside air temperature is a predetermined temperature and the upper temperature of the vehicle interior is higher than a predetermined temperature; and a driving means 103 for driving each mode door according to the determination results of the first and second blowout mode determining means 101 and 102.

(Effect) Therefore, the outside air temperature during the intermediate seasons such as spring and autumn is relatively high.
Moreover, when the temperature in the upper part of the vehicle interior is relatively high, the blowout mode is determined excluding the mode in which air is blown out from the footwell outlet.

When vent mode or pie level mode is selected,
Warm air that accumulates near the head can be removed, and the feeling of air conditioning near the head can be improved.

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

In FIG. 2, an air conditioning control device for an automobile is shown, and an inside air inlet 2 and an outside air intake 3 are formed in the form of two branches on the most upstream side of an air conditioning duct 1, and an inside/outside air switch is formed at the divided part. A door 4 is provided, and the inside/outside air switching door 4 selects the air to be introduced into the air conditioning duct 1 between inside air and outside air.

The fan 5 is for sucking air into the air conditioning duct 1 and blowing it to the downstream side, and an evaporator 6 and a heater core 7 are arranged on the downstream side of the fan 5.

The evaporator 6 constitutes a cooling cycle together with a compressor (not shown), etc., and is designed to cool the air passing through it.The temperature of the air passing through the evaporator 6 is T.
e is detected by the evaporator outlet temperature sensor 8.

Further, the heater core 7 is inserted into a hot water cycle in which cooling water of an engine (not shown) circulates, for example, and heats the air passing therethrough.

An air mix door 9 is provided in front of the heater core 7, and the air mix door 9 adjusts the ratio of air passing through the heater core 7 to air bypassing the heater core 7 by adjusting its opening degree. be.

Note that the air that has passed through the heater core 7 and the air that has bypassed the heater core 7 meet and mix in an air mix chamber 10 formed on the downstream side of the air conditioning duct 1.

The downstream side of the air conditioning duct 1 is divided into a vent outlet 11, a foot outlet 12, and a defrost outlet 13, which open into the vehicle interior 18, and mode doors 14a, 14 are installed in the separated parts.
b, 14c are provided, and these mode doors 14a, 14
By selecting b and 14c, the blowing mode of the air blown into the vehicle interior 18 can be arbitrarily set.

15 is a bypass duct, one end of which is connected to the air conditioning duct 1 mentioned above.
It opens between the evaporator 6 and the heater core 7, and the other end opens to the vent outlet 11. A cold air bypass door 16 is provided in the bypass duct 15, and the cold air bypass door 16 and the bypass duct 1 are connected to each other.
5 constitutes a cold air bypass unit 17, which bypasses a part of the cold air that has passed through the evaporator 6 to the vent outlet 11 by opening and closing the cold air bypass door 16, and finely adjusts the air temperature blown out. It is now possible to do so.

Reference numerals 21 and 22 are actuators for adjusting the opening degree, which are used to rotate the air mix door 9 and the cold air bypass door 16 described above.

24 are the mode doors 14 a, 14 b, and 14 c described above.
This is a switching actuator for switching.

25, 26, and 27 are for obtaining feedback signals, respectively. 25 is an air mix door opening degree that detects the opening degree of the air mix door 9, and 26 is a position detector that detects the opening degree of the cold air bypass door 16. , 27 is mode door 1
This is a position detector that detects the mode positions of 4a to 14c.

28 is a vehicle interior temperature detector that detects the vehicle interior temperature Tr;
29 is a solar radiation sensor that detects the amount of solar radiation Ts; 30 is a vehicle interior upper temperature detector that detects the upper part of the vehicle interior (near the head) Tru; and 31 is an outside air temperature sensor that detects the outside air temperature Ta.

32 is a multiplexer, and the various sensors 8.25 mentioned above
- 31 are input, and the input signals are sequentially switched and output according to control signals from a microcomputer 34, which will be described later.

35 is a temperature setting device, and up/down switches 35a, 3
The set can be changed by pressing 5b appropriately.

36 is a mode setting device, at least VENT (36a)
, B I -L (36b), HEAT (36c)'.

It has a DEF (36d) push button, and when these are pressed, manual control is possible, and the AUTO switch 3
By pressing 7, mode control (VENT, BI-
L, HEAT, DEF/HEAT modes) are automatically controlled according to a predetermined program described below.

38 is a fan switch, FANl (38a).

It has push buttons for FAN2 (38b) and FAN3 (38c), and manual control is possible by pressing these buttons. Note that by pressing the AUT◯ switch 37, the rotation speed can be controlled automatically according to a predetermined pattern.

Reference numeral 39 is a switch for turning on the air conditioner, and when this is pressed, the compressor is operated and the air conditioning is controlled.

40 is an FF switch for controlling the mode and stopping the fan rotation speed. Temperature setting device 3 like this
5. Mode setting device 36. The signal of the fan switch 38 is
It is input to the microcomputer 34 and used for control.

The microcomputer 34 is a central processing unit (CPU)
, read-only memory (ROM), input/output device (I/○
) etc., which are known per se. The microcomputer 34 operates the drive circuit 40 according to a predetermined program based on the input signals from the A/D converter 33, the temperature setting device 35, the mode setting device 36, the fan switch 38, etc. ．． '41, 42. Via 43.

The operation of the fan 5, air mix door 9, cold air bypass door 16, and mode doors 14a to 14c described above is controlled. An example of the control operation of the microcomputer 34, particularly an example of the blowout mode switching operation, is shown as a flowchart in FIG.

That is, in FIG. 3, the microcomputer 34
When the device is started, execution of the program is started from step 200, and in the next step 201, the above-mentioned signal, the lower cabin temperature Trd, the amount of solar radiation Ts, and the outside air temperature Ta are
, air temperature Te after evaporator blowout, set temperature Td,
Upper cabin (near the head) temperature Tru, engine water temperature Tw
and the opening degree θX of the air mix door.

In step 202, a total signal T corresponding to the heat load condition of the vehicle necessary to bring the temperature inside the vehicle interior to the set target temperature is calculated based on data indicating the environmental conditions in the vehicle interior 18.

T=1Ts for Tru+, 2Ts for Ta+, 4Td for Te-
+C...Equation (1) However, each census of 1 to 4 is the gain of the setting device, and C is a correction term.

Although not described in detail, based on this comprehensive signal T, the rotational speed of the blower and the opening degree of the air mix door are controlled so as to bring the temperature inside the vehicle compartment to a desired set value.

In step 203, a blowout mode switching signal Tf necessary for selecting a blowout mode is calculated based on the above-mentioned input signals of the air temperature Te after blowing out from the evaporator and the opening degree θX of the air mix door.

Tf=Te+, θx...'' (2) where K is the gain of the opening degree of the air mix door.

In the next step 204, the mode setting is automatic (AUTO).
), and if NO, the process proceeds to step 205 of manual mode.

In the case of automatic (AUTO) mode, the next step 20
6, and in step 206 it is determined whether the outside air temperature is higher than a predetermined temperature (15° C. in the temperature increasing direction, 10° C. in the temperature decreasing direction), and if it is higher than the predetermined temperature (B), the process proceeds to step 207. If the temperature is lower than the predetermined temperature (A), the process proceeds to step 208.

In step 207, the vehicle interior upper temperature Te is set to a predetermined temperature (
It is determined whether the temperature is higher than 30° C. in the temperature increasing direction and 25° C. in the temperature decreasing direction. If the temperature is lower than the predetermined temperature (A), the process proceeds to the first step 208.

That is, in step 208, if the outside air temperature Ta is lower than the predetermined temperature (A), and if the vehicle interior upper temperature Tru is lower than the predetermined temperature (A), it is determined whether the blow mode control is completed. .

If the startup control has not been completed (No), the process proceeds to step 209, and if the temperature is below a predetermined temperature using the engine water temperature Tti as a parameter (A), the process proceeds to step 210 to select the defrost mode. If the engine water temperature is set and the engine water temperature is equal to or higher than the predetermined temperature (B), the process proceeds to step 211 where control from the defrost mode to the heater mode is performed.

If the startup control has been completed (YES), the process proceeds to the next step 212, where the blowout mode switching signal Tf necessary for selecting the blowout mode calculated in step 203 is input.
If the temperature is below a predetermined temperature (A), the process proceeds to step 213 and is set to a defrost and heat mode in which air is blown out in 50% portions, for example.

If the temperature is higher than the predetermined temperature (B), step 21
Proceed to step 4.

In step 214, if the blowout mode switching signal Tf is below the predetermined temperature (A), the process proceeds to step 215 and the defrost blowout port is switched from the defrost and heat mode to the
Set to % bleed heat mode. If the temperature is higher than the predetermined temperature (B), the process proceeds to step 218.

In step 218, if the blowout mode switching signal Tf is below the predetermined temperature (A), the process proceeds to step 219 and from the vent mode to the pie level mode (a linear transition is possible).
The mode is set to an appropriate mode up to. If the temperature is higher than the predetermined temperature (B), the process proceeds to step 220 and the vent mode is set.

In step 207, if the temperature is higher than the predetermined temperature (B), the process bypasses steps 208, 212, 214, and 216 and proceeds to step 218. That is,
Under conditions where the outside air temperature Ta is above a predetermined temperature and the upper part of the vehicle interior temperature is above a predetermined temperature, the outside air is relatively warm and the temperature near the head is warm, only modes excluding the defrost mode and heat mode are determined. .

Therefore, under these conditions, only one of the vent mode and pie level mode will be selected, which allows the wind to flow near the head and prevent relatively warm air from accumulating. be.

For this reason, if such control is performed and the upper temperature in the vehicle interior decreases, it goes without saying that the mode 1 will be determined, including the defrost and heat mode and the heat mode. , it has nothing to do with the air conditioning feeling.

The flow of determination as described above is returned to the start step 200 via step 221, and the control as described above is performed.

If the blowout mode switching pattern shown in the flow is illustrated, it will be a diagram as shown in FIG. 4.

In addition, this example shows an example in which the blowout mode is automatically controlled to the defrost 1-and-heater mode, which blows out about 50% of the air from the defrost outlet in consideration of preventing fogging of the windshield. However, it goes without saying that the present invention can also be applied to an example in which the blowing modes of vent mode, pie level mode, and heat mode are automatically controlled.

(Effects of the Invention) As described above, according to the present invention, when there is sunlight during the intermediate seasons such as spring and autumn, or when the outside temperature is relatively high at the time of restarting, and the upper temperature inside the vehicle is relatively high, Since the blowout mode is judged excluding the mode that blows air out from the footwell outlet, vent mode or pie level mode is selected and air can flow to the upper part of the passenger compartment, allowing air to flow to the upper part of the passenger compartment. It is possible to remove the warm air that remains in the head area and improve the air conditioning feeling in the vicinity of the head area.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is a flowchart for controlling the blowout mode switching of the present invention, and FIG. 4 is a flowchart of the blowout mode switching control of the present invention. It is a switching diagram. 8...Air temperature detector after evaporator blows out, 14a
, 14b, 14c'' mode door, 25... air mix door opening degree detector, 29... vehicle interior upper temperature detector, 31... outside air temperature detector, 100... mode signal calculation means , 101...first mode determining means, 10
2... Second mode determining means, 103... Driving means.

Claims (1)

[Scope of Claims] A blowout mode signal calculation means for calculating a blowout mode switching signal from vehicle heat load information, an outside air temperature detector for detecting outside air temperature, and a vehicle interior upper temperature detection unit for detecting an upper temperature in the vehicle interior. a first air blowing mode including a mode in which air is blown out from at least the foot air outlet when it is determined that the outside air temperature is less than a predetermined temperature and the upper temperature of the vehicle interior is less than a predetermined temperature;
a second air blowing mode determination means for determining air blowing modes other than a mode in which air is blown from the foot air outlet when it is determined that the outside air temperature is a predetermined temperature and the upper temperature of the vehicle interior is higher than a predetermined temperature; An air conditioning control device for an automobile, comprising: a blowout mode determining means; and a driving means for driving each mode door according to the determination results of the first and second blowout mode determining means.