JP2840945B2 - Automotive air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Objects of the Invention (1) Industrial Field of the Invention The present invention relates to an air conditioning control device for a vehicle, and more particularly, to a target temperature of a vehicle interior according to a vehicle interior temperature and a vehicle exterior temperature. The present invention relates to a vehicle air-conditioning control device that approaches and maintains a value.

(2) Prior Art Conventionally, an air-conditioning control device for an automobile which keeps the vehicle interior temperature close to a target value according to the vehicle interior temperature and the vehicle exterior temperature is disclosed in Japanese Patent Publication No. 59-39334. As shown, the output signals of the sensors that independently detect the temperature in the vehicle interior and the temperature outside the vehicle are multiplied by respective coefficients and added to obtain the opening degree of the air mix damper. There is known a device that drives a mix damper to adjust the temperature.

Also, as shown in Japanese Utility Model Publication No. 59-31447,
A potentiometer whose resistance value changes nonlinearly according to the opening of the air mix damper is connected in series with a sensor that detects the temperature inside and outside the vehicle, and the output signal is amplified to drive the air mix damper. It is also known to adjust the temperature by adjusting the temperature.

(3) Problems to be Solved by the Invention However, in an air-conditioning control apparatus for an automobile which drives an air-mix damper to adjust the temperature, the damper is generally formed in a flat plate shape, and a bypass in parallel with a heating heat exchanger is provided. One end is pivotally supported by the ventilation duct so as to be rotatable in the passage, and the rotation adjusts the flow ratio of air passing through the heating exchanger and the bypass passage. In this case, the relationship between the substantial passage cross-sectional area ratio of the heat exchanger and the bypass passage in the ventilation duct and the opening degree of the air mix damper becomes non-linear as shown in FIG. 9, for example. Since the ventilation resistance changes depending on the opening degree of the air mixing damper, the relationship between the opening degree of the air mix damper and the blown air temperature also becomes non-linear. In particular, when the opening of the air mix damper is small, the blown air temperature is lower than the ideal characteristic, and when the opening of the air mix damper is large, the blown air temperature is higher than the ideal characteristic.

For this reason, nonlinear correction cannot be performed by obtaining the opening degree of the air mix damper by multiplying the output signals of the sensors for independently detecting the vehicle interior temperature and the exterior temperature by multiplying the output signals by a coefficient, and adding the coefficients. was there.

Further, in the case of using a potentiometer in which the resistance value changes non-linearly according to the opening degree of the air mix damper, a high-precision potentiometer is required in order to perform fine correction, and it is generally used frequently. In the range of the opening degree of the air mix damper, there is almost no difference from the 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-described circumstances, and accurately corrects the degree of opening of an air mix damper to make the relationship with the blown air temperature closer to a linear ideal characteristic, and sufficiently performs fine correction. It is an object of the present invention to provide an air-conditioning control device for a vehicle that can perform the above.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, an automotive air-conditioning control device of the present invention sends air toward a passenger compartment 1 as shown in FIG. A blower motor 3 disposed in the ventilation duct 2 for blowing air toward the passenger compartment 1;
A cooling heat exchanger 4 disposed in the ventilation duct 2;
A heating heat exchanger 5 and a bypass passage 6 arranged in parallel with each other in the ventilation duct 2, and one end 7 a in the bypass passage 6 is rotatably supported by the ventilation duct 2, The flat plate-shaped air mix damper 7 for adjusting the flow ratio of the air passing through the heating heat exchanger 5 and the bypass passage 6 by the movement, and at least the vehicle interior temperature Tr and the vehicle exterior temperature Tam are detected independently. Multiple sensors 8, 9
And the vehicle interior temperature Tr according to the output signals of the sensors 8 and 9.
Required air temperature calculating means 10 for calculating the required air temperature Tao required to approach and maintain the target value,
Air mix damper opening calculating means for calculating a target damper opening Sw of the air mix damper 7 by using a predetermined calculating formula based on an output signal of the required blown air temperature calculating means 10.
11 and an air-conditioning control device for an automobile, comprising an air mix damper driving means 13 for driving the air mix damper 7 based on an output signal of the air mix damper opening degree calculation means 11. The air mix damper opening calculating means is used to match the calculated required blown air temperature Tao with the actual blown air temperature.
A correction means for correcting the output signal of 11 with a correction value stored in advance based on the relationship between the damper opening of the air mix damper 7 and the actual blown air temperature and outputting the corrected signal to the air mix damper drive means 13 12 and this correction means
12, when the target damper opening Sw of the air mix damper 7 is small, the actual damper opening Swr is larger than that,
In addition, when the target damper opening Sw is large, the nonlinear correction is performed so that the actual damper opening Swr becomes smaller than that.

(2) Operation Since the automotive air-conditioning control device according to the present invention having the above-described configuration includes the blower motor 3 that is disposed in the ventilation duct 2 for sending air toward the passenger compartment 1 and that blows air. Then, air flows into the ventilation duct 2 toward the passenger compartment 1.
Then, the air is cooled by the cooling heat exchanger 4. The cooled air is divided into air to be heated through the heating heat exchanger 5 and air not to be heated through the bypass passage 6, and one end of the cooled air is rotatably supported by the ventilation duct. The opening degree of the flat plate-shaped air mix damper 7 is adjusted, and the temperature of the air blown into the passenger compartment 1 is adjusted according to the opening degree.

Further, in accordance with output signals of a plurality of sensors 8 and 9 for independently detecting at least the vehicle interior temperature and the vehicle exterior temperature, the required air temperature required to maintain the vehicle interior temperature close to its target value is determined. Required blowing air temperature calculating means 10 to be calculated
An air mix damper opening calculating means 11 for calculating an opening of the air mix damper 7 based on the output signal;
Air mix damper driving means 13 for driving the air mix damper 7 based on the output signal; therefore, the opening degree of the air mix damper 7 is adjusted so as to maintain the vehicle interior temperature close to a target value. Is done.

Then, in the correcting means 12, the output signal of the air mix damper opening degree calculating means 11 is converted to an air signal in order to make the required blowing air temperature Tao calculated by the necessary blowing air temperature calculating means 10 coincide with the actual blown air temperature. Mix damper 7
Is corrected based on the relationship between the damper opening and the actual blown air temperature with a correction value stored in advance, and when the correction is performed, if the target damper opening Sw of the air mix damper 7 is small, the correction is performed. When the actual damper opening Swr is large, and when the target damper opening Sw is large, nonlinear correction is performed so that the actual damper opening Swr becomes smaller than that. Even if the relationship of the air temperature is nonlinear, the relationship with the blown air temperature can be made closer to the linear ideal characteristic by performing the nonlinear correction of the air mix damper opening degree as described above, and the fine correction is sufficiently performed. As a result, the air blowing from the air mix damper can always be controlled to the required blowing air temperature, and the vehicle interior temperature can be accurately maintained at its target value. You.

Further, even when the structure and characteristics of the air mix damper are changed due to a model change or the like, the correction value used in the correction means 12 can be changed relatively easily, and the air mix damper opening degree calculation means 11 can change the correction value. Required outlet air temperature
Target damper opening Sw from Tao using basically the same formula
Can be simply calculated, so that it is easy to cope with it as a whole.

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

FIG. 2 is a view showing an embodiment of the present invention, and the same components as those in FIG. 1 are denoted by the same reference numerals. Upstream of the ventilation duct 2 for sending air into the vehicle interior 1, the exterior air intake duct 14 and the interior air intake duct 15 are selectively communicated by the interior and exterior air cutting damper 16. It has become. The taken-in air is sent into the vehicle interior 1 by the blower motor 3. The air is cooled by a cooling heat exchanger 4 composed of an evaporator. This cooled air is
The air is divided into air heated through the heating heat exchanger 5 and air not heated through the bypass passage 6, and the flow ratio thereof is determined by the flat air whose one end 7 a is rotatably supported by the peripheral wall of the ventilation duct 2. It is adjusted by the opening of the 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 supplied to the ventilator damper 17,
Depending on the open / close state of the defroster damper 18 and the heater damper 19, air is blown into the vehicle compartment 1 from the respective outlets.

A sensor 8 for detecting the temperature Tr inside the vehicle is provided in the vehicle interior 1.
However, a sensor 9 for detecting the vehicle outside temperature Tam is provided outside the vehicle compartment. And the output signals of the sensors 8, 9 are:
Along with the solar radiation sensor output signal 20, the temperature setting signal 21, and the air conditioning mode signal 22, the signal is input to the microcomputer 25 via the noise processing circuit 23 and the analog-to-digital converter 24. The microcomputer 25 has a CPU for performing arithmetic processing, a ROM in which programs and the like are stored, a RAM used as a work area, an interface for performing input / output processing, and the like, which are integrated in an LSI of one or several chips. . The output signal of the microcomputer 25 is input to an inside / outside air switching damper drive circuit 26, a blower motor drive circuit 27, an air mix damper drive circuit 28, and an outlet drive circuit 29. The output signal of the inside / outside air switching damper drive circuit 26 is used to drive the inside / outside air switching damper drive motor.
30, the blower motor 3 is controlled by the output signal of the floor motor drive circuit 27, the air mix damper drive motor 31 is controlled by the output signal of the air mix damper drive circuit 28, and the outlet damper drive motor 32 is controlled by the output signal of the outlet drive circuit 29. doing.

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

Output signals of the sensors 8 and 9, solar radiation sensor output signal 2
The noise, the temperature setting signal 21, and the air conditioning mode signal 22 are removed by a noise processing circuit 23, converted into digital signals by an analog-to-digital converter 24, and input to the microcomputer 25. Microcomputer 25
Implements the functions of the required blown air temperature calculating means 10, the air mix damper opening degree calculating means 11, and the correcting means 12 and, in accordance with the air conditioning mode signal 22, the inside / outside air switching damper 16, the ventilator damper 17, the defroster It functions as a control means for opening and closing the damper 18 and the heater damper 19 and a control means for controlling the rotation speed of the blower motor 3. Then, the inside / outside air switching damper drive circuit 26, the blower motor drive circuit 27, the air mix damper drive circuit 28, and the outlet drive circuit 29 are operated by the output signal of the microcomputer 25. Therefore, the inside and outside air switching damper drive motor 30 is outside air switching damper 16 by the blower motor 3, the blower 3 ₁
However, the air mix damper 7 is driven by the air mix damper drive motor 31, and the ventilator damper 17, the defroster damper 18, and the heater damper 19 are driven by the outlet damper drive motor 32, respectively.

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

In the following description, the required blowing air temperature is Tao, the vehicle interior set temperature is Ts, the vehicle interior temperature is Tr, the vehicle exterior temperature is Tam, the solar radiation amount is St, the target damper opening is Sw, and the actual damper opening is Swr. explain.

In FIG. 3, first, at step 33, Ts, Tr, Tam, S
Enter the value of t. In step 34, the value Tao of the required blown air temperature is obtained by the calculation of the equation (1).

_{Tao = C 1 · Ts-C} 2 · Tr-C 3 · Tam-C 4 · St-C 5 ...... (1) _{where, C 1, C 2, C} 3, C 4 and C ₅ is, C _{1> C 5> C 2> C 4} > C 3
Is a constant satisfying the condition of, for example, C ₁ = 5.7, C ₂ = 3, C
₃ = 1.3, C ₄ = 2, and C5 = 3.6.

In step 35, the value Sw of the table damper opening is obtained by the calculation of the equation (2).

Sw = (Tao-Te) / (80-Te) (2) where Te is a correction constant, and a known value may be used depending on, for example, the capacity of the cooling exchanger 4.

Next, at step 36, based on the non-linear relationship between the damper opening of the air mix damper 7 and the actual blown air temperature (the change characteristic of the solid line in FIG.
A correction value stored in advance is read in accordance with the value of the target damper opening Sw obtained in 35, and is set as the actual damper opening Swr.

Further, in step 37, the value Swr of the actual damper opening is output to the air mix damper drive circuit.

Actually, the microcomputer 25 also functions as another control means, for example, the control means of 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 described with reference to FIG. FIG. 4 (a) is a diagram showing the relationship between the target damper opening Sw and the actual damper opening Swr. The dotted line shows the case of ideal characteristics, and the solid line shows the corrected case. FIG. 4 (b) shows the relationship between the blown air temperature and the opening degree of the damper of the air mix damper 7. The dotted line shows the ideal characteristic, and the solid line shows the actual characteristic affected by the ventilation resistance. The value of the target damper opening Sw is S
At this time, if the characteristics are ideal, the temperature of the blown air becomes T without any correction, and matches the required temperature of the blown air. But,
In actual characteristics, it is 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 characteristic shown by the solid line in FIG. The temperature can be matched to the required blowing temperature. Therefore, if the characteristic of the solid damper opening shown in FIG. 4A is stored for each target damper opening, the actual damper opening corresponding to the obtained target damper opening is obtained. Can be corrected by reading the value of.

Thus, as is apparent from the characteristics shown in FIG.
In the illustrated example, when the target damper opening Sw of the air mix damper 7 is smaller, the actual damper opening Swr is larger than that, and when the target damper opening Sw is larger, the actual damper opening Swr is larger than that. Is corrected to be smaller.

As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the embodiments, and various design changes may be made without departing from the present invention described in the appended claims. It is possible.

For example, in addition to correcting the non-linear relationship between the damper opening of the air mix damper 7 and the blown air temperature, other corrections can be performed simultaneously.

As another example of the correction, there is a correction of the non-linear 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 includes an air mix damper drive motor 31
Are driven by a link mechanism composed of an arm 38 fixed to the output shaft of the arm 38 and an arm 39 engaged with the arm 38 by a pin and a long hole. Therefore, the relationship between the rotation angle θ and the rotation angle θ ′ is a non-linear relationship as shown in FIG. 6, so that the air mix damper drive motor 31 is driven to the rotation angle θ to obtain the required blown air temperature. However, the rotation angle θ 'of the air mix damper 7 does not reach the required damper opening, and the required blown air temperature cannot be obtained.
In order to correct this non-linear relationship, the correction values corresponding to FIG. 6 may be stored in advance.

Further, as another example of the correction, there is a correction of a sensor that detects the temperature inside and outside the vehicle compartment. The sensor is, for example, a resistor
Apply voltage Vc to the series connection circuit of 40 and thermistor 41,
It is configured to take out the output signal V from the connection point. Therefore, the output signal V becomes as shown in FIG. 8 due to the non-linear output characteristics of the thermistor. When the air conditioning control is performed based on this output signal, a difference occurs between the target temperature and the actual temperature. In order to correct this shift, a correction value corresponding to FIG. 8 may be stored in advance, and the correction value may be read to perform the correction.

C. Effects of the Invention As described above, according to the present invention, the vehicle interior temperature is maintained close to its target value in accordance with the output signals of the plurality of sensors that independently detect the vehicle interior temperature and the vehicle exterior temperature. Required air temperature calculating means for calculating the required air temperature required to perform the operation, and an air mix damper opening degree for calculating the opening degree of the air mix damper using a predetermined arithmetic expression based on an output signal of the temperature calculating means. An air mix damper driving means for driving the air mix damper based on an output signal of the opening degree calculation means, so that the opening degree of the air mix damper is controlled so as to keep the vehicle interior temperature close to a target value. Can be adjusted.

Also, in order to make the required blown air temperature calculated by the required blown air temperature calculating means coincide with the actual blown air temperature, the output signal of the air mix damper opening calculating means is compared with the damper opening of the air mix damper and the actual output air temperature. Based on the relationship with the blown air temperature, correction is performed using a correction value stored in advance, and when the correction is performed, if the target damper opening of the air mix damper is small, the actual damper opening is larger than that. In the case where the target damper opening is large, there is provided a correcting means for performing a non-linear correction so that the actual damper opening is smaller than that, so that a rotation fulcrum is provided at one end in the bypass passage. Even if the relationship between the opening degree of the air mix damper formed in a flat plate shape and the temperature of the blown air is nonlinear, the opening degree of the air mix damper is nonlinearly compensated by the correction means. It is possible to bring the relationship between the blowing air temperature to the ideal characteristics of a linear by,
Fine correction can be sufficiently performed, and as a result, the air blown from the air mix damper can always be controlled to the required blown air temperature, and the vehicle interior temperature can be accurately maintained at its target value.

Further, even when the structure and characteristics of the air mix damper are changed due to a model change, the correction value used in the correction means can be changed relatively easily, and the necessary blowout is required in the air mix damper opening degree calculation means. Since the target damper opening can be simply calculated from the air temperature using basically the same calculation formula, it is easy to cope as a whole.

[Brief description of the drawings]

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 FIGS. ) Is a diagram for explaining the operation of the correction, FIG. 5 is a diagram showing a driving mechanism of the air mix damper, FIG. 6 is a diagram showing the characteristics of FIG. 5, FIG. 7 is a circuit diagram of the sensor, FIG. FIG. 9 is a graph showing the characteristics of FIG. 7, and FIG. 9 is a graph showing the relationship between the passage cross-sectional area ratio between the heating heat exchanger and the bypass passage in the ventilation duct and the air mix damper opening. 1 ... car room, 2 ... ventilation duct, 3 ... blower motor,
4 ... heat exchanger for cooling, 5 ... heat exchanger for heating, 6 ...
Bypass passage 7, air mix damper 8, 9, sensor 10, required air temperature calculating means 11, air mix damper opening calculating means 12, correction means 13, air mix damper Driving means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60H 1/00 101 B60H 1/00 103

Claims (1)

(57) [Claims] A ventilation duct (2) for sending air toward a vehicle compartment (1), and a blower motor (10) disposed in the ventilation duct (2) and configured to blow air toward the vehicle compartment (1). 3), a cooling heat exchanger (4) arranged in the ventilation duct (2), and a heating heat exchanger (5) and a bypass passage arranged in parallel with each other in the ventilation duct (2). (6), and one end (7a) of the heating duct (2) is rotatably supported by the ventilation duct (2) in the bypass passage (6). A plate-shaped air mix damper (7) for adjusting a flow rate of air passing through the bypass passage (6); at least a vehicle interior temperature (Tr) and a vehicle exterior temperature (Tam)
And a plurality of sensors (8, 9) that independently detect the vehicle interior temperature (T) according to the output signals of the sensors (8, 9).
r), a required blown air temperature calculating means (10) for calculating a required blown air temperature (Tao) necessary to approach and maintain the target value, and an output signal of the required blown air temperature calculating means (10). The air mix damper (7) based on a predetermined arithmetic expression
Air mix damper opening calculating means (11) for calculating the target damper opening (Sw) of the air, and air for driving the air mix damper (7) based on an output signal of the air mix damper opening calculating means (11). In the automotive air-conditioning control device provided with the mix damper driving means (13), in order to make the required blowing air temperature (Tao) calculated by the required blowing air temperature calculating means (10) coincide with the actual blowing air temperature. The output signal of the air mix damper opening calculating means (11) is corrected by a correction value stored in advance based on the relationship between the damper opening of the air mix damper (7) and the actual blown air temperature. And a correction means (12) for outputting to the air mix damper driving means (13) by means of the air mix damper (7).
If the target damper opening (Sw) is smaller, the actual damper opening (Swr) is larger than that, and the target damper opening (Sw)
When w) is large, nonlinear correction is performed so that the actual damper opening (Swr) becomes smaller than that.
Automotive air conditioning control device.