JP2711730B2 - Automotive air conditioning controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning control apparatus for an automobile, in particular, in which the switching control of a blowing mode is improved.

(Prior Art) A recently developed automotive air conditioner calculates a target outlet temperature or the like used as a control parameter based on at least the temperature inside and outside the vehicle interior and a set temperature, and based on this calculation result. In many cases, the blowing mode is determined. As such, for example,
Japanese Unexamined Patent Publication No. -484 is known. This is because the vent mode is set when the target outlet temperature is equal to or lower than the first predetermined value, and the heat mode is set when the target outlet temperature is equal to or higher than a second predetermined value larger than the first predetermined value. Between the predetermined values, the mode door is stabilized at an arbitrary position according to the target blowing temperature so that a bi-level state of an arbitrary ratio is obtained from the vent mode to the heat mode.

(Problems to be Solved by the Invention) However, in such an apparatus that automatically switches the blow mode, the position of the mode door is adjusted to a tuned position on the temperature control in order to control the interior of the vehicle to a desired temperature. It is desirable to stabilize, but if the target outlet temperature is used as a parameter as in the above-described device, the mode door will be stabilized at an arbitrary position when the vehicle interior temperature reaches the target outlet temperature in a stable state. Temperature control performance is no longer guaranteed. For example, when the mode door position at the time of the bi-level is stopped at a position closer to the side to reduce the amount of vented air, air that is not air-mixed (cool air) is blown out from the vent outlet due to a structure or a decrease in the amount of blown air. There is a disadvantage that the vent blowing temperature is lowered. To guarantee such temperature variation performance in all areas between vent and heat mode, difficult operations such as re-tuning the temperature control lever at each position of the mode door, etc. Accompany.

In order to solve this, the mode door may be stopped only at a predetermined position at the time of the bi-level as in the conventional mode switching, but in this case, the vent mode and the bi-level,
The transition between the bi-level and the heat mode becomes gradual, and when the temperature setting needs to be changed or the solar radiation suddenly changes, such as when the rapid switching of the blowing mode is required, the switching of the blowing mode can be promptly performed. It is desirable, however, that the switching of the blowing mode is performed rapidly until other times, giving the occupant a sense of discomfort due to a sudden change in the blowing wind.

Therefore, according to the present invention, the mode door is reliably stopped at a predetermined position for switching the blowing mode, and the prompt switching of the blowing mode is realized while realizing a request for prompt mode switching at the time of temperature setting change or the like. It is an object of the present invention to provide a vehicle air-conditioning control device capable of preventing a decrease in occupant's feeling due to a sudden change in the blowing wind and performing optimum blow-off mode switching control.

(Means for Solving the Problems) However, the gist of the present invention is, as shown in FIG. 1, a mode door 22a which is arranged in front of an air outlet and changes a blowing mode for blowing air into a vehicle compartment. , 22b, and at least a vehicle interior temperature and a blowing mode switching parameter calculating means for calculating a blowing mode switching parameter based on the set temperature
100 and a blowing mode selecting means 200 for determining a blowing mode based on the blowing mode switching parameter calculating means 100
And, a temperature control change degree detecting means 300 for detecting a change degree of a factor affecting the temperature control change in the vehicle cabin, and whether the change degree detected by the temperature control change degree detecting means 300 is larger than a predetermined amount or not. When the blowout mode switching signal is output by the blowout mode selection means 200, and when the degree of change is determined to be greater than the predetermined amount by the determination means 400, When the mode doors 22a and 22b are quickly driven at a first speed to a predetermined position for forming the blowing mode selected by the blowing mode selecting means 200, and when it is determined that the degree of change is smaller than the predetermined amount, The mode door is moved to a predetermined position for forming the blow mode selected by the blow mode selecting means 200.
A mode door drive control means 500 for gradually driving the first and second speeds 22a and 22b at a second speed lower than the first speed is provided.

(Operation) Therefore, the blowing mode switching parameter calculating means 100
A desired blow mode is selected by the blow mode selection means 200 according to the value calculated by the above formula, and the selected blow mode switches the mode door to a predetermined position via the mode door drive control means 500. However, the switching speed of the mode door is controlled by the degree of change in the value detected by the temperature control change degree detecting means 300 (determined by the determining means 400). For example, the operation of moving the mode door can be performed promptly at the time of a temperature setting change or a rapid change in solar radiation where a large change in the temperature control in the vehicle compartment is desired, and in the normal blowing mode switching that does not require early acute. By driving the mode door slowly to a predetermined position, it is possible to eliminate a sudden change in the blown air, and thus the above-mentioned problem can be achieved.

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

In FIG. 2, the air conditioner requiring an automobile is an air conditioning duct 1
The inside / outside air switching device 2 is provided at the uppermost stream of the vehicle. The inside / outside air switching device 2 is provided with an intake door 5 at a portion where the inside air inlet 3 and the outside air inlet 4 are separated from each other.
The air conditioning duct 1 is operated by operating
The air introduced into the inside can be selected from inside air and outside air.

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

The evaporator 8 includes a compressor 10, a condenser 11,
The liquid tank 12 and the expansion valve 13 are connected by piping to form a cooling cycle, and the compressor 10 is connected to an automobile engine 14 via an electromagnetic clutch 15 and is controlled to be turned on and off by intermittently operating the electromagnetic clutch 15. You. Further, the heater core 9 is
Cooling water circulates to heat the air.

An air mix door 16 is provided in front of the heater core 9, and the opening Δx of the air mix door 16 is adjusted by an actuator 17 so that air passing through the heater core 9 and air bypassing the heater core 9 are separated. The amount is changed so that the temperature of the blown 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 and opens to the vehicle interior 21. The divided portions are the mode doors 22a and 22a.
b, and the mode doors 22a and 22b are
By operating at 23, a desired blowing mode can be obtained.

Reference numeral 24 denotes an opening sensor, for example, a potentiometer for detecting the opening Δx of the air mixing door 16, 25 a vehicle interior temperature sensor for detecting the temperature Tr of the air in the vehicle interior, and 26 an insolation Qs.
Is an outside air temperature sensor that detects outside air temperature Ta.These signals are input to an A / D converter 30 via a multiplexer 29 that performs signal selection, where they are converted into digital signals. The data is input to the microcomputer 31. Further, an output signal from the operation panel 32 is input to the microcomputer 31.

The operation panel 32 has an A / C switch 33 for operating the compressor 10 and an ECON switch 34 for economically controlling the compressor.Each air conditioner switches to an automatic control mode when any of these switches is pressed. enter. Further, the operation panel 32 includes an OFF switch 35 for stopping the operation of the air conditioner, a DEF switch 36 for setting the blowing mode to the defrost mode, a temperature setting device 37 for setting a set temperature in the passenger compartment,
A blowing capacity setting device 38 for setting a blowing capacity, a blowing mode setting device 40 for setting a blowing mode other than the defrost mode, and a suction mode setting device 40 for setting a suction mode, are provided with a set temperature, a blowing capacity, a blowing mode, The inhalation mode is displayed on the display unit 42 controlled by the microcomputer 31 via the display circuit 41.

The microcomputer 31 is a central processing unit (not shown)
CPU, read-only memory ROM, random access memory RA
M, input / output port I / O, etc.
3. Output control signals to the mode of the blower 7 and the electromagnetic clutch 15 via the drive circuits 43a to 43e, respectively,
Drive control of 6, 22a, 22b, rotation control of blower 7, and ON / OFF control of electromagnetic clutch 15 are performed.

FIG. 3 is a flowchart showing an example of a control routine for switching the blowing mode by the microcomputer 31 described above. The microcomputer 31 starts executing this program from step 50. In step 52, the set temperature T _D , the vehicle interior temperature Signals such as Tr, the outside air temperature Ta, the amount of solar radiation Qs, and the opening Δx of the air mix door 16 are input. Then, calculated by the target air temperature X _M, for example, (1) In a next step 54, it is calculated by the mode switching parameter X using the blowing mode for switching example (2) In the next step 56 solo.

X _M = A · T _D −B · Tr−C · Ta−D · Qs + E (1) Expression X = A · T _D −B · Tr−C · Ta−K · Qs + E (2) Expression where A , B, C, D, and K are operation constants, and E is a correction term. Further, there is a relation of K> D. Thus, reason why the mode switch parameter X to the target air temperature X _M and separately, since a large effect on the temperature control feeling of the passenger by the solar radiation, in order to attempt is made appropriate responses.

In step 58, on the basis of the target air temperature X _M determines the opening Θx of the air mixing door 16 from a predetermined characteristic pattern, the air mix door so that the opening degree Θx
Drive control of 16. Then, in step 60, any one of the vent mode (VENT), the bi-level mode (B / L), and the heat mode (HEAT) is set based on a predetermined characteristic pattern determined in advance based on the mode switching parameter X. select.

After the blowing mode is selected, the routine proceeds to step 62, where it is determined whether or not the selected blowing mode has been switched. If there is no switch, the process proceeds to another control routine while the mode door is maintained at the current position, and if it is determined that there is a switch, the mode door is driven in the following manner.

First, in step 64, factors affecting temperature control changes in the vehicle interior, for example, the degree of change in the target air temperature X _M delta
To detect the X _M. Then, in the next step 66, the degree of change Δ
X _M is determined whether greater than the predetermined value alpha, if [Delta] X _M> alpha, place until the mode doors 22a to form the air outlet mode selected in the step 60, the 22b rapidly driven ( An example is shown in step 68).

On the other hand, if ΔX _M is equal to or less than α, the mode door 22
The a and 22b are gradually driven over a predetermined period of time to a predetermined position for forming the blowing mode selected in step 60 (an example is shown in step 70).

Therefore, when it is desired to change the temperature control state significantly by changing the temperature setting or sudden change of solar radiation by appropriately selecting the value of α, it is possible to realize a quick change of the blowing control according to the request. In the normal blowing mode switching which does not require the above, it is possible to suppress the occupant's discomfort due to the sudden change of the blowing wind by slowly driving the mode door.

Incidentally, in this embodiment, so that changing the drive mode door by a change degree of the target air temperature X _M, it may be used the degree of change in overall signal T as represented by (3) .

T = A'.Tr + B'.Ta + C ', Qs-D'.TD + E' (3) where A 'to _D ' are operation constants, and E is a correction term.

Further, as a factor affecting the temperature control change, the opening degree Θx of the air mix door 16 can be considered, and as shown in FIG. 4, the degree of change ΔΘx of the opening degree Θx is calculated instead of ΔX _M ( Step 72), as shown in the next step 74, the driving speed of the mode doors 22a and 22b may be changed according to the magnitude of ΔΘx.

(Effects of the Invention) As described above, according to the present invention, the switching of the blowing mode is performed on the assumption that the mode door is gradually switched.
If it is necessary to significantly change the temperature control inside the cabin when changing the temperature setting or sudden change in solar radiation, increase the switching speed of this mode door. Since the speed can be made slower, the temperature control performance is always guaranteed, and the optimal blow mode switching control can be realized in which the blow wind does not suddenly change unnecessarily to give the occupant an uncomfortable feeling. .

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a flowchart showing an example of a blowing mode switching control routine by the microcomputer in the above, and FIG. It is a flowchart which shows the example of switching control of the blowing mode by the microcomputer which shows Example. 22a, 22b: Mode door, 100: Blow-out mode switching parameter calculation means, 200: Blow-out mode selection means, 300: Temperature control change degree detection means, 400: Judgment means, 500: Mode door drive control means .

Claims (1)

(57) [Claims] 1. A mode door arranged in front of an air outlet to change an air outlet mode for blowing air into a vehicle compartment, and an air outlet mode switching parameter for calculating a air outlet mode switching parameter based on at least a vehicle interior temperature and a set temperature. Calculating means, a blowing mode selecting means for determining a blowing mode based on the blowing mode switching parameter calculating means, a temperature control change degree detecting means for detecting a degree of change of a factor affecting a temperature control change in the vehicle compartment, Determining means for determining whether or not the degree of change detected by the temperature control change degree detecting means is greater than a predetermined amount; and when the blowing mode switching signal is output by the blowing mode selecting means, the determining means If it is determined that the degree of change is larger than the predetermined amount, the motor is moved to a predetermined position for forming the blowing mode selected by the blowing mode selecting means. If the degree of change is determined to be smaller than the predetermined amount, the mode door is moved to a predetermined position for forming the blowout mode selected by the blowout mode selection means. And a mode door drive control means for gradually driving at a second speed lower than the first speed.