JPH01226414A - Air conditioning controller for automobile - Google Patents

Abstract

PURPOSE:To perform delicate control of an air mix damper by a method wherein the opening of an air mix damper is determined by means of a discharge air temperature computed by means of a temperature in a car room and an atmosphere temperature, and the opening signal is corrected by means of a preset correction value. CONSTITUTION:Through detection of a temperature in a car room and an atmosphere temperature by means of sensors 8 and 9, respectively, a necessary discharge temperature is computed by a necessary discharge air temperature computing means 10. An air mix damper(AMD) opening computing means 11 calculates the opening of an air mix damper 7 based on a necessary discharge air temperature. A correction means 12 corrects the calculated opening by means of a correction value so that characteristics are adjusted to a value approximately equal to a prestored ideal value. By means of the corrected target opening, an AMD drive means 13 drives and controls the air mix damper 7. This constitution adjusts characteristics to a value approximately equal to an ideal value to perform delicate control.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Field of Application The present invention relates to an air conditioning control device for an automobile, and in particular, a method for adjusting the temperature inside the vehicle to a target value according to the temperature inside the vehicle and the temperature outside the vehicle. The present invention relates to an air conditioning control device for an automobile that is maintained in close proximity to the vehicle.

(2) Conventional technology Conventionally, an air conditioning control device for an automobile that maintains the temperature inside the vehicle near a target value according to the temperature inside the vehicle and the temperature outside the vehicle is disclosed in Japanese Patent Publication No. 59-39334. As shown, the opening degree of the air mix damper is determined by multiplying the output signals of the sensors that independently detect the vehicle interior temperature and the vehicle exterior temperature by coefficients and adding them. A device is known that controls temperature by driving a mix damper.

In addition, as shown in Japanese Utility Model Publication No. 59-31447, a potentiometer whose resistance value changes non-linearly depending on the opening degree of the air mix damper is used as a sensor for detecting the vehicle interior temperature and vehicle exterior temperature. It is also known to connect in series and amplify the output signal to drive an air mix damper to adjust the temperature.

(3) Problems to be Solved by the Invention However, in automotive air conditioning control devices that control temperature by driving an air mix damper, the ventilation resistance changes depending on the opening degree of the air mix damper. The relationship between temperature and outlet air temperature is nonlinear. In particular, when the opening degree of the air mix damper is small, the temperature of the blown air is lower than the ideal characteristic, and when the opening degree of the air mix damper is large, the blown air temperature is higher than the ideal characteristic.

Therefore, the problem is that non-linear correction is not possible with the method that calculates the opening degree of the air mix damper by multiplying the output signals of the sensors that independently detect the vehicle interior temperature and vehicle exterior temperature by respective coefficients and adding them. was there.

Furthermore, in the case of using a potentiometer whose resistance value changes non-linearly according to the opening degree of the air mix damper, a highly accurate potentiometer is required to perform detailed correction, and moreover, it is not commonly used. In the range of opening degrees of the air mix damper, there is almost no difference from linear correction due to the accuracy of the potentiometer, and there is a problem that a sufficient effect cannot be obtained.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to correct the opening degree of the air mix damper so that the relationship with the temperature of the blown air approaches a linear ideal characteristic, and to perform sufficient fine-grained correction. Structure of the B2 Invention Aiming to Provide an Automotive Air Conditioning Control Device (1) Means for Solving the Problems In order to achieve the above object, an automobile air conditioning control device of the present invention is provided as shown in FIG. 2, a blower motor 3 disposed within the ventilation duct 2 to blow air toward the vehicle interior 1; a cooling heat exchanger 4 and a heating heat exchanger 5 arranged in parallel in the ventilation duct 2.
and a bypass passage 6, an air mix damper 7 that adjusts the flow rate ratio of air passing through the heating heat exchanger 5 and the bypass passage 6, and a plurality of dampers that independently detect at least the vehicle interior temperature and the vehicle exterior temperature. a sensor 8.9, and a necessary blowout air temperature calculating means 10 for calculating the necessary blowout air temperature necessary to maintain the vehicle interior temperature close to its target value according to the output signals of the sensors 8 and 9; Based on the output signal of the required blowout air temperature calculation means 10, the air mix damper opening calculation means 11 calculates the opening of the air minx damper buff, and based on the output signal of the air mix damper opening calculation means 11, In the automobile air conditioning control device including the air mix damper driving means 13 for driving the air mix damper 7, the output signal of the air mix damper opening calculation means 11 has a correction value stored in advance in accordance with the output signal. It is characterized in that it is inputted to the air mix damper driving means 13 via the correction means 12 which is provided.

(2) Function The air conditioning control device for an automobile according to the present invention having the above-described configuration includes a blower motor 3 disposed in a ventilation duct 2 for blowing air toward the vehicle interior 1. Therefore, air flows into the ventilation duct 2 toward the passenger compartment 1. This air is then cooled by the cooling heat exchanger 4.

This cooled air is divided into air that passes through the heating heat exchanger 5 and is heated, and air that passes through the bypass passage 6 and is not heated, and the flow rate ratio thereof is adjusted by the opening degree of the air mix damper 7. Therefore, the temperature of the air blown into the passenger compartment 1 is adjusted by the degree of opening of the air minx damper puff.

Further, the necessary blowing air temperature necessary to maintain the vehicle interior temperature close to its target value is determined according to the output signals of the plurality of sensors 8 and 9 that independently detect at least the vehicle interior temperature and the vehicle exterior temperature. a necessary blowout air temperature calculating means 10 for calculating the required blowing air temperature; an air mix damper opening degree calculating means 11 for calculating the opening degree of the air mix damper 7 based on its output signal; and an air mix damper driving means 13 for driving. Therefore, in order to maintain the vehicle interior temperature close to the target value, the opening degree of the air mix damper 7 is adjusted.

At this time, the output signal of the near mix damper opening calculation means 1 is input to the air mix damper drive circuit 13 via the correction means 12 in which a correction value is stored in advance according to the output signal. Therefore, the optimum correction value can be stored for each value of the output signal of the air mix damper opening calculation means 11.

(3) Examples Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention, and the same components as in FIG. 1 are given the same numbers. Upstream of the ventilation duct 2 for sending air into the vehicle interior 1, a vehicle exterior air intake duct 14 and a vehicle interior air intake duct 15 are selectively communicated with each other by an inside/outside air switching damper 16. It has become. The air taken in is transferred to the passenger compartment l by the blower motor 3.
sent inward. The air is cooled by a cooling heat exchanger 4 consisting of an evaporator. This cooled air is divided into air that passes through the heating heat exchanger 5 to be heated and air that passes through the bypass passage 6 and is not heated, and the flow rate ratio thereof is adjusted by the opening degree of the air mix damper 7. Therefore, the temperature of the air is adjusted by the opening degree of the air mix damper 7, and this air is blown into the passenger compartment 1 from the respective air outlets depending on the opening/closing states of the ventilator damper 17, defroster damper 18, and heater damper 19. .

Further, inside the vehicle interior 1, there is a sensor 8 that detects the vehicle interior temperature.
A sensor 9 is provided outside the vehicle interior to detect the temperature outside the vehicle interior. The output signals of the sensors 8 and 9 are sent to the microcomputer 2 through the noise processing circuit 23 and the analog-to-digital converter 24 together with the solar radiation sensor output signal 2o, the temperature setting signal 21, and the air conditioning mode signal 22.
5 is input. This microcomputer 25 has a CPU that performs arithmetic processing, a ROM that stores programs, etc., a RAM that is used as a work area, an interface that performs input/output processing, etc., integrated into one or several LSI chips. . The output signal of the microcomputer 25 is sent to the internal/external air switching damper drive circuit 26.
, a blower motor drive circuit 27, an air mix damper drive circuit 28, and an air outlet drive circuit 29.

Then, the output signal of the inside/outside air switching damper drive circuit 26 drives the inside/outside air switching damper drive motor 30, the output signal of the blower motor drive circuit 27 drives the blower motor 3, and the output signal of the air mix damper drive circuit 28 drives the air mix damper drive motor 31. The outlet damper drive motor 32 is controlled by the output signal of the outlet drive circuit 29.

Next, the operation of the embodiment of the present invention having the above-described configuration will be explained.

Output signals of the sensors 8 and 9, solar radiation sensor output signal 2
0, temperature setting signal 21, and air conditioning mode signal 22 are as follows:
The noise processing circuit 23 removes noise, the analog-to-digital converter 24 converts the signal into a digital signal, and the signal is input to the microcomputer 25 . The microcomputer 25 includes the necessary blowout air temperature calculation means 10, the air mix damper opening degree calculation means 11, and the correction means 1.
In addition to realizing the functions of 2, the internal/external air switching damper 16 and the ventilator damper 17
, functions as means for controlling the opening and closing of the defroster damper 18 and heater damper 19, and means for controlling the rotation speed of the blower motor 3. Then, based on the output signal of the microcomputer 25, the internal/external air switching damper drive circuit 26, the blower motor drive circuit 27, the air mix damper drive circuit 2
8 and the blower outlet drive circuit 29 are operated. Therefore, the inside/outside air switching damper drive motor 30 drives the inside/outside air switching damper 16, the blower motor 3 drives the blower 3°, the air mix damper drive motor 31 drives the air mix damper 7, and the outlet damper drive motor 32 drives the ventilator damper 17 and defroster damper. 1% 8 and heater damper 19 are each driven.

At this time, the microcomputer 25 operates based on the flowchart shown in FIG. 3 in order to maintain the temperature inside the vehicle compartment 1 close to the set target value.

In the following explanation, the required blowout air temperature, vehicle interior setting temperature,
The values of the vehicle interior temperature, vehicle exterior temperature, solar radiation, target damper opening, and actual damper opening are set as Tao, Ts, Tr, respectively.
This will be explained as Tam, St, Sw, and Swr. In FIG. 3, in step 33, Ts, Tr, Tam, S
The value of t is calculated manually. In step 34, the value Tao of the required blowout air temperature is determined by calculating equation (1).

Tao=C+ -Ts-Cz ・Tr-C3-Ta
m-C,・5t-Cs (1) However, CI, C2, C3, C4 and C3 are CI > Cs
>Cz >C4>Cs is a constant that satisfies the condition, for example, C,=5.7, C2=3, C,=1.3, C4-2,
Takes the value of C5=3.6. Then, in step 35, the value Sw of the target damper opening degree is calculated by the equation (2).

Sw= (Ta o-Te)/ (80-Te)=・(
2) However, Te is a correction constant, and a known value may be used depending on, for example, the capacity of the cooling exchanger 4. Then, in step 36, the target damper opening degree S obtained in step 35 is
A pre-stored correction value is read out according to the value of w, and is set as the actual damper opening degree. In step 37, the actual damper opening value Swr is output to the air mix damper drive circuit 28.

Note that, in reality, the microcomputer 25 also functions as a control means for other control means, for example, the blower motor 3. Therefore, the temperature is adjusted by repeatedly executing a program corresponding to the flowchart shown in FIG. 3 as a subroutine.

Next, the correction performed in step 36 will be explained with reference to FIG. FIG. 4(a) is a diagram showing the relationship between the target damper opening degree Sw and the actual damper opening degree Swr, where the dotted line shows the case of ideal characteristics and the solid line shows the case of correction. FIG. 4(b) is a diagram showing the relationship between the blowing air temperature and the damper opening degree of the air mix damper 7, where the dotted line represents the ideal characteristic and the solid line represents the actual characteristic affected by ventilation resistance. If the value of the target damper opening degree Sw is S, if the characteristic is ideal, the blowing air temperature will be T even without correction, which will match the necessary blowing air temperature. However, in actual characteristics, it becomes T'. Therefore, if the actual damper opening is determined for each value of the target damper opening as shown by the solid line in Fig. 4 (a), even if the actual characteristics shown by the solid line in Fig. 4 (b) are The temperature can be matched with the required blowing temperature. Therefore, if the actual damper opening value is memorized for each target damper opening value, the actual damper opening value corresponding to the target damper opening value is determined based on the characteristics shown by the solid line in FIG. Correction can be made by reading the value of .

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and various design changes can be made without departing from the scope of the invention described in the claims. Is possible.

For example, in addition to correcting the nonlinear relationship between the damper opening degree of the air mix damper 7 and the blown air temperature, other corrections can also be made simultaneously or independently.

Another example of correction is correction of the nonlinear relationship between the rotation angle θ of the air mix damper drive motor 31 and the rotation angle θ′ of the air mix damper 7, as shown in FIG. The air mix damper 7 is connected to the air mix damper drive motor 3
An arm 38 fixed to the output shaft of No. 1, and this arm 38
It is driven by a link mechanism consisting of an arm 39 that is engaged with a pin and an elongated hole. Therefore, the relationship between the rotation angle θ and the rotation angle θ' is a non-linear relationship as shown in FIG. Even if the air mix damper 7 rotates at a rotation angle of θ',
The required damper opening cannot be achieved and the required blowing air temperature cannot be obtained. In order to correct this nonlinear relationship, correction values corresponding to FIG. 6 may be stored in advance.

Furthermore, another example of correction is correction of a sensor that detects the temperature inside and outside the vehicle interior. The sensor may include a resistor 40, for example.
The voltage Vc is applied to a series connection circuit of the thermistor 41 and the thermistor 41, and the output signal (2) is taken out from the connection point. Therefore, due to the non-linear output characteristics of the thermistor, the output signal (2) becomes as shown in FIG. 8, and when air conditioning is controlled based on this output signal, a deviation occurs between the target temperature and the actual temperature. In order to correct this deviation, the correction values corresponding to FIG. 8 may be stored in advance, and the correction values may be read out and corrected.

C1 Effects of the Invention As described above, according to the automotive air conditioning control device of the present invention, the output signal of the air mix damper opening calculation means is processed by the correction means in which the correction value is stored in advance in accordance with the output signal. It is inputted to the air mix damper driving means via the air mix damper drive means. Therefore, since the opening degree of the air mix damper can be finely and accurately corrected, the temperature in the vehicle interior can be accurately maintained at the target value. Furthermore, since the correction value can be easily changed, it can be applied to corrections for various characteristics regardless of whether linear correction or nonlinear correction is performed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is a flowchart for explaining the operation of the embodiment, and FIG. 4 (A). (b) is a diagram for explaining the effect of correction, Figure 5 is a diagram showing the drive mechanism of the air mix damper, Figure 6 is a diagram showing the characteristics of Figure 5, Figure 7 is a circuit diagram of the sensor, Figure 8 is the 7th
FIG. DESCRIPTION OF SYMBOLS 1... Vehicle interior, 2... Ventilation duct, 3... Blower motor, 4... Cooling heat exchanger, 5... Heating heat exchanger, 6... Bypass passage, 7...・Air mix damper, 8, 9...Sensor, 10...Necessary outlet air temperature calculation means, 11...Air mix damper opening calculation means, 12...Correction means, 13...Air mix damper Drive means patent applicant: Honda Motor Co., Ltd., agent, patent attorney: Kendo Ochiai
1) Takahide Naka Figure 3 Figure 7 Vc Figure 8 ■ -2002040 Outside air 'A ('C) Figure 5

Claims (1)

[Claims] A ventilation duct (2) for sending air toward one vehicle compartment (1).
), a blower motor (3) disposed in the ventilation duct (2) and blowing air toward the vehicle interior (1), and a cooling heat sensor (8) disposed in the ventilation duct (2). , 9), a necessary blowout air temperature calculation means (10) for calculating the necessary blowout air temperature necessary to maintain the vehicle interior temperature close to its target value, and the necessary blowout air temperature calculation means (10); an air mix damper opening calculation means (11) for calculating the opening of the air mix damper (7) based on the output signal of the means (10); and an exchanger for the air mix damper opening calculation means (11).
4), a heating heat exchanger (5) and a bypass passage (6) arranged in parallel in the ventilation duct (2), and a heating heat exchanger (5) and the bypass passage (6) arranged in parallel. An air mix damper (7) that adjusts the flow rate ratio of passing air; and a plurality of sensors (8, 9) that independently detect at least the vehicle interior temperature and vehicle exterior temperature. In an automobile air conditioning control device including an air mix damper driving means (13) for driving a damper (7), the output signal of the air mix damper opening calculation means (11) is set to a correction value in advance according to the output signal. is stored in the correction means (12
) An air conditioning control device for an automobile, characterized in that the input is input to the air mix damper driving means (13) via the air mix damper drive means (13). 2. The air conditioning control device for an automobile according to item 1, wherein the correction means (12) performs nonlinear correction. 3. The air conditioning control device for an automobile according to item 2, wherein the nonlinear correction is large when the air mix damper opening is small, and small when the air mix damper opening is large.