JPH0350018A - Air conditioning controller for automobile - Google Patents

Abstract

PURPOSE:To prevent a sense of incongruity at changeover in the above device to automatically change over blow-out mode at target blow-out temperature by correcting to be a prescribed blow-out mode in the hysteresis temperature range of detected environment signals, when the target blow-out temperature is in the range of hysteresis temperature of blow-out mode changeover temperature. CONSTITUTION:A target blow-out temperature is computed by a target blow-out temperature computing means 100, and a blow-out mode is selected by a blow- out mode selecting means 200. When the target blow-out temperature is within the hysteresis temperature range of blow-out mode changeover temperature, a blow-out mode correcting means 300 selects a prescribed blow-out mode, corresponding to a prescribed condition in the hysteresis temperature range of the open air temperature Ta and the solar radiation quantity Ts output by environment means 26,28. When the mode is different from the selected mode by the mode selecting means 200, it is corrected to control a mode door. By this constitution, the sense of incongruity at changeover can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioning control device for an automobile that automatically switches the blowout mode according to a target blowout temperature, and particularly relates to a blowout mode selection method in a hysteresis range of the blowout mode switching temperature. Regarding improvements.

(Prior Art) Conventionally, the selection of the blowout mode of air blown into the vehicle interior in a car air conditioner (automotive air conditioning control device) has been made based on a target blowout temperature calculated by a predetermined formula (for example, Publication No. 62-58926 and Special Publication No. 6
3-244, etc.).

(Problem to be Solved by the Invention) However, at the blowout mode switching point of the target blowout temperature, hunting occurs during automatic control (the control value does not reach the set value immediately, and the control value repeatedly goes too far or returns too much). Because hysteresis is provided to prevent this phenomenon, the temperature at which the blowout mode is switched during control during the spring, autumn, and other seasons may be inappropriate and do not match the air conditioning sensation of the occupants.

Therefore, the present invention solves the above-mentioned conventional problems, and the switching of the blowing mode within the hysteresis temperature range at the blowing mode switching point of the target blowing temperature makes the occupant feel uncomfortable even during control such as in the middle of the season. Our goal is to provide an air-conditioning control device for automobiles that never fails.

(Means for Solving the Problems) As shown in FIG. In an air conditioning control device for an automobile that supplies heated air into a vehicle interior 30 through a defrost outlet 11, a vent outlet 12, and a foot outlet 13 selected by controlling mode doors 14, 15, and 16. , environmental signal detection means 26 and 28 for detecting environmental signals such as outside air temperature and solar radiation, and a target air outlet temperature corresponding to the heat load inside the vehicle interior based on a plurality of input signals including at least the interior temperature of the vehicle interior and the set temperature within the vehicle interior. a target blowout temperature calculation means 100 that calculates a blowout temperature, a blowout mode selection means 200 that selects a blowout mode based on the calculation result of the target blowout temperature calculation means 100, and a blowout mode selection means 200 that selects a blowout mode based on the calculation result of the target blowout temperature calculation means 100; In some cases, the environmental signal detection means 26
．． a blowout mode correction means 300 that selects a predetermined blowout mode according to a predetermined condition in the temperature range of the detection result of No. 28 and corrects the blowout mode selected by the blowout mode selection means 200; and the blowout mode correction means 3
The mode door 1 is set to the blowout mode determined by 00.
Drive control means 17.40 for driving and controlling 4, 15.16
c.

(Operation) Therefore, the target air outlet temperature is calculated by the target air outlet temperature calculation means 100, and the air outlet mode is selected by the air outlet mode selection means 200 based on this target air outlet temperature. Then, by the blowout mode correction means 300,
When the target blowout temperature is within the hysteresis temperature range of the blowout mode switching temperature, a predetermined blowout mode is selected according to a predetermined condition in the temperature range of the environmental signal, and this is the blowout mode selected by the blowout mode selection means 200. If it differs from that, it will be corrected. The drive control means 17, 40c drives the mode doors 14, 15, 16 to set the blowout mode determined by the blowout mode correction means 300, and therefore the above-mentioned object can be achieved.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. As shown in Fig. 2, the automotive air conditioning control device has an inside air population 2 and an outside air population 3 provided at the most upstream side of the air conditioning duct l-1, and a part where the inside air population 2 and outside air population 3 are separated. An intake door (inside/outside air switching door) 5 is arranged, and the intake door 5 is operated by an actuator 6 to select the air to be introduced into the air conditioning duct 1 between inside air and outside air, so that a desired intake mode can be obtained. It has become.

The air blower m7 sucks air into the air conditioning duct 1 and blows it downstream, and an evaporator 8 is arranged behind this blower 7. The evaporator 8 is connected to piping 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 mix door 10 is provided upstream of the heater core 9. By adjusting the opening degree of the air mix door 10 with an actuator 10a, the heater core By changing the wall between the air passing through heater core 9 and the air bypassing heater core 9, the temperature of the blown air is controlled.

The downstream side of the air conditioning duct 1 includes a defrost outlet 11, a vent outlet 12, and a foot outlet 13.
opens into the vehicle compartment 30, and mode doors 14, 15, and 16 are provided at each outlet. The mode doors 14, 15, 16 are controlled by an actuator 17 to obtain a desired blowing mode.

The motors of the actuators 6.10a and 17 and the blower 7 are driven by drive circuits 40a and 40b, respectively.
It is controlled based on the output signals from 40c and 40d. The drive circuits 40a to 40d are connected to the microcomputer 33.

On the other hand, a vehicle interior temperature sensor 2 that detects the vehicle interior temperature Tr
5. An outside air temperature sensor 26 that detects the outside air temperature Ta, a potentiometer 27 that detects the opening e8 of the air mix door 10, and a solar radiation sensor 28 that detects the left and right solar radiation amount Ts.
The detection signals from the multiplexer 31 and the like are selected by the multiplexer 31 and input to the A/D converter 32, where they are converted into digital signals and then input to the microcomputer 33.

The control panel 38 includes an auto switch 38a that instructs automatic control of each air conditioner, an off switch 38b that instructs to stop all air conditioners, a vent switch 38d that is an air conditioner switch 38c1 mode switch that instructs the compressor to operate, Pie level switch 38e.

A foot switch 38f, a differential switch 38g, and a fan switch 38h (1st speed) that changes the rotation speed of the blower 7.
, 38i (2nd speed), 38j (3rd speed), and a temperature setting device (up/down switch) 38 for setting the set temperature T□ in the passenger compartment 30 and its temperature display section 38j2, etc. These setting operation signals are input to the microcomputer 33.

Next, an example of the control operation of the microcomputer 33 will be explained, starting with the main routine for controlling the air conditioner shown in FIG. Starting from a start step 50, in the next step 52, initial values of each program variable are set, and the process proceeds to step 54. In step 54, data input processing is performed to input signals of detected values of the various sensors to the microcomputer 33. In the 0th step 58, the target blowout temperature
Perform the calculation of M. The calculation of this target blowing temperature X,4 is as follows:
For example, the formula XN=Kr using the detection values of the various sensors mentioned above
-Tr 10Ka -Ta +Ks -Ts -Ksac
T,,t +C (However, Kr SK a SKs s
Ks@t is a gain constant and C is a calculation constant). Then, the process proceeds to step 60, and the air mix door 10 is driven and controlled based on the control signal of the target blowout temperature Xi calculated in step 58. In the next step 62, the rotational speed of the blower 7 is controlled according to the target blowing temperature X. Then, in step 64, a blowout mode control routine (described later), the target blowout temperature X is set. A blowout mode is selected based on the temperature and outside temperature Ta, and the mode doors 14, 15, and 16 are controlled to set this blowout mode.

In the next step 68 and step 70, the target blowing temperature X is determined. The operation of the intake door 5 and the compressor is controlled based on this. Then, step 54
Return to data input processing.

Next, the blowout mode control routine shown in FIG. 4 will be explained. Start from start step 80 and then step 8
In step 2, it is determined whether or not the auto switch 38a has been pressed, and if it has been pressed (YES), the process advances to step 90.
If the mode switch has not been pressed (NO), the process proceeds to step 84. Steps from this step 84 to the next step 86 and step 88 show the processing when the mode switch is manually pressed. In step 84, the vent switch 38d
Determine whether or not is pressed, and if it is pressed (yE
s) Go to step 106 and set the blowout mode to vent mode, and if it is not pressed (No), go to step 8
Proceed to step 6. In step 86, the pie level switch 38e
It is determined whether or not is pressed, and if it is pressed (Yl
! S) Go to step 108 and set the blowout mode to pie level, and if it is not pressed (NO), go to step 8
Proceed to step 8. In this step 88, the foot switch 38f
Determines whether or not is pressed, and if it is pressed (YE
S) Proceed to step 110 and set the blowout mode to foot mode, and if it is not pressed (NO), return to step 82. On the other hand, in step 90, the target blowing temperature X calculated in step 58 of FIG.

In the zero-order step 94, in which a signal input process for the outside air temperature Ta is performed, the target blowout temperature X, 4 calculated in step 58 of the main control routine is determined. The target blowout temperature X,4 is determined by arbitrarily determined blowout mode switching temperatures XMII, XN, ,
1 XN4 (However, Xw+<Xxz<XM3<X,
). In the same figure, 1, XMi Xx
g constitutes the hysteresis range of the switching temperature between the vent mode and the pie level mode, and X and 3°X1i4 constitute the hysteresis range of the switching temperature between the pie level mode and the foot mode. Therefore, in step 94, if it is X or X
The process proceeds to step 12, and if XM≧XMI, the process proceeds to step 96.

In this step 96, the target blowing temperature X is also set.

Judgment: X Ml < X H < X. If so (Pi is in the hysteresis range), proceed to step 98; if XH≧X, 4z, proceed to step 101; in step 9, the outside temperature Ta is determined, and Ta > 17 (
'C), proceed to step 106, and Ta < 1
5 If ('C), proceed to step 108, set the blowout mode to pie level mode, and return to step 1.
Proceed to step 12. In step 101, the target blowing temperature
Determine M, and if XM2<XM x Xo, proceed to step 108, and if X or ≧XXS, proceed to step 10.
Proceed to step 2. In this step 102, the target blowout temperature
If X, 4x < X H < X M4 (Pi is in the hysteresis range), step 10
If XM≧X, 44, the process proceeds to step 110, where the blowout mode is set to foot mode, and then the process proceeds to return step 112. In the step 104, the outside air temperature Ta is determined, and if Ta < 13 ('C), the process proceeds to the step 110, and if Ta > 15 ('
If C), the process proceeds to step 108.

In this way, the hysteresis temperature range XNIXHt and X
. In +XM4, the blowing mode is determined according to the outside air temperature Ta. That is, the hysteresis temperature range XMII
In Ltg, when the outside air temperature Ta is below 15°C, it is in pie level mode, when it is above 17°C, it is in vent mode, and in the hysteresis temperature range XMl+XM4, when outside air temperature Ta is above 15°C, it is in pie level mode, 13
When the temperature is below °C, it is in foot mode.

In this embodiment, the outside air temperature Ta is used as the selection criterion for the blowout mode when the target blowout temperature XN is within the hysteresis temperature range at the blowout mode switching temperature.
The solar radiation ITs, which is the detected value of the solar radiation sensor 27, may be used.

(Effects of the Invention) As explained above, according to the present invention, when the target blowout temperature is within the hysteresis temperature range at the blowout mode switching point, an appropriate blowout mode is selected depending on the outside air temperature (or the amount of solar radiation). Therefore, especially in the middle seasons of spring and autumn, the air outlet mode can be changed to suit the occupant's sense of the season, without changing the air outlet mode at a temperature that does not suit the occupant's senses within the hysteresis temperature range, as was the case in the past. It improves the feeling.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing the configuration of the present invention, Fig. 2 is a block diagram showing an automotive air conditioning control device in an embodiment of the invention, and Fig. 3 is a flowchart showing the main routine of the microcomputer used in the above. FIG. 4 is a flowchart showing the blowout mode control routine of the microcomputer used in the above, and FIG. 5 is a characteristic line diagram showing the relationship between the target blowout temperature and the blowout mode. 8... Evaporator, 10... Air mix door,
11... Defrost outlet, 12... Vent outlet, 13... Foot outlet, 14.15.16.
...Mode door, 26...Outside temperature sensor, 28...
・Solar radiation sensor, 33...Microcomputer, 10
0...Target blowout temperature calculation means, 200...Blowout mode selection means, 300...Blowout mode correction means,
17.40c... Drive control means. Figure 5 XMI XM2 XMj XM4 (XM)

Claims (1)

[Claims] Air that is sucked into the air conditioning duct, cooled by the evaporator, and heated according to the opening degree of the air mix door is sent to the defrost outlet, vent outlet, and foot outlet selected by the control of the mode door. An air conditioning control device for an automobile that supplies air to a vehicle interior through the mouth includes an environmental signal detection means for detecting environmental signals such as outside air temperature and solar radiation, and a plurality of input signals including at least a vehicle interior temperature and a set temperature in the vehicle interior. a target air outlet temperature calculation means for calculating a target air outlet temperature corresponding to the heat load in the vehicle interior based on the target air outlet temperature; an air outlet mode selection means for selecting an air outlet mode based on the calculation result of the target air outlet temperature calculating means; When the blowout mode switching temperature is within the hysteresis temperature range, a predetermined blowout mode is selected according to a predetermined condition in the hysteresis temperature range of the detection result of the environmental signal detection means, and the blowout mode selected by the blowout mode selection means is selected. An air conditioning control device for an automobile, comprising: a blowout mode correction means for correcting the blowout mode; and a drive control means for driving and controlling the mode door to set the blowout mode to the blowout mode determined by the blowout mode correction means.