JP2965787B2 - Air conditioning control method for automotive air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning control method for a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner for a vehicle, a blower voltage and an opening degree of a mix damper are controlled as follows using, for example, a microcomputer in order to adjust a blowing amount and a blowing temperature.

[0003] That is, the blower voltage is calculated based on a first control calculation value obtained by comparing and calculating the in-vehicle temperature, the outside air temperature and the amount of insolation input from the inside air sensor, the outside air sensor and the solar radiation sensor and the set temperature. It is set according to a pattern stored in advance. The blower voltage is corrected in accordance with an increase or decrease in the amount of solar radiation, a change in the outside air temperature, and an increase in the temperature of the engine cooling water.

On the other hand, the opening degree of the mix damper is set according to a pattern stored in advance based on a second control calculation value obtained by comparing and calculating the outside air temperature and the amount of solar radiation with the set temperature, and calculating the second control calculation value. It is corrected according to the increase or decrease.

[0005]

However, in such a conventional control method, the blower voltage and the opening degree of the mix damper are separately obtained by different control operation values and different patterns. The correlation between degrees is difficult to grasp. In addition, since the relationship between the two greatly affects the air-conditioning state, it is difficult to always maintain a comfortable air-conditioning state.

Further, since the blower voltage must be individually corrected based on a plurality of conditions such as the outside air temperature, the control method becomes complicated. It is difficult to determine whether the operation is appropriate. The present invention has been made in view of the above problems, and has as its object to provide an air conditioning control method for an automotive air conditioner that can obtain a comfortable air conditioning state.

[0007]

According to the present invention, in order to achieve the above-mentioned object, the blower amount is controlled by calculating a blower voltage in accordance with internal and external conditions such as an outside air temperature, a room temperature, and a solar radiation amount. In an air conditioning control method for an automotive air conditioner, in which the amount of air to be heated by the heater core is adjusted by calculating the degree of opening of the mix damper to control the blowing temperature,
By performing first fuzzy inference based on internal and external conditions other than the amount of solar radiation, the reference blower voltage and the reference mix damper opening are calculated, and the calculated reference blower voltage and reference mix damper opening and at least the amount of solar radiation are included. By performing the second fuzzy inference based on the inside and outside conditions, the blower voltage correction amount and the mix damper opening degree correction amount are calculated.

[0008]

Next, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram of a vehicle air conditioner. Reference numeral 1 denotes a blower which is rotated by a blower motor 2 and takes in outside air or inside air into the unit. Reference numeral 3 denotes an evaporator for cooling and dehumidifying the air sucked by the blower 1. Reference numeral 5 denotes a mix damper, which is rotated by driving an actuator 6. This mix damper 5
Determines the amount by which the air cooled and dehumidified by the evaporator 3 passes as it is, and the amount heated by the heater core 7 according to the opening degree, and adjusts the blowing temperature.

Reference numeral 10 denotes a control device having a built-in microcomputer. Detection signals from an evaporator sensor 11, a water temperature sensor 12, an outside air sensor 13, an inside air sensor 14, a solar radiation sensor 15, and a temperature adjustment switch 16 are input to input ports thereof. I have.

The evaporator 11 is provided on the downstream side wall of the evaporator 3 and detects the temperature (T _E ) of the air cooled by the evaporator 3. The water temperature sensor 12 is provided in the heater core 7 and detects the temperature (Tw) of the engine cooling water flowing inside. The outside air sensor 13 is provided on the front of the vehicle and detects an outside air temperature (Ta). The inside air sensor 14 is provided at a front portion inside the vehicle and has a temperature inside the vehicle (T
r) is detected. The solar radiation sensor 15 is provided on a dashboard in the front of the vehicle and detects the amount of solar radiation (SRA).
The temperature adjustment switch 16 is provided at a front portion inside the vehicle, and a set temperature (T _S ) is input by an operation of an occupant.

The control device 10 issues a control signal to the blower motor 2 and the actuator 6 via an output port based on the input signal in accordance with a program stored in a memory, and controls a driving state thereof.

In the vehicle air conditioner having the above-described structure, the air flow and the air temperature are controlled as shown in the flowchart of FIG. That is, in step S1, various sensors 1
The outside air temperature (Ta), the vehicle interior temperature (Tr), and the cooling water temperature (T
w), wind temperature passing through the evaporator (T _E ), solar radiation (SR
A) and a detection signal of the set temperature (Ts).

In step S2, based on the outside air temperature (Ta), the vehicle interior temperature (Tr), the cooling water temperature (Tw), the evaporator passing air temperature (T _E ) and the set temperature (Ts),
By the first fuzzy inference described later, the reference blower voltage (V
_B ) and the reference mix damper opening (MIX) are determined.

In step S3, the vehicle interior temperature (Tr) and the amount of solar radiation (SRA) input in step S1, and the blower voltage (V _B ) and mix damper opening (MIX) obtained in step S2 are based on the data. And the second
A blower voltage correction amount (ΔV _B ), a mix damper opening correction amount (ΔMIX), and a delay time (τ) are determined by fuzzy inference. The delay time (τ) is such that the mix damper opening (MIX) and the blower voltage (V _B ) do not change immediately when the amount of solar radiation (SRA) changes rapidly (for example, when the vehicle enters a tunnel). That's what we do.

In step S4, the reference blower voltage (V _B ) and the reference mix damper opening (MIX) obtained by the first fuzzy inference, the blower voltage correction amount (ΔV _B ) obtained by the second fuzzy inference, and The correction amount of the mix damper opening (ΔMIX) is added.

In step S5, an output signal is sent to each of the blower motor 2 and the actuator 6 based on the calculated value and the delay time (τ), and the process returns to step S1 to repeat the above steps.

The membership functions and fuzzy rules required in the first and second fuzzy inferences in steps 2 and 3 are as shown in FIGS. 5 to 9, which are previously stored in the memory of the control device. ing.

That is, as shown in FIG. 5 (a), the membership function of the outside air temperature (Ta) is such that the ZR membership function is set in a triangular shape centering on 5 ° C. NS, NM, NL and PS, PM, PL are set up to 40 ° C. and to 40 ° C. on the right side, respectively. In-vehicle temperature (Tr), cooling water temperature (Tw), evaporator passing air temperature (T _E ), and set temperature (Ts)
Are also set as shown in FIGS. 5B to 5E.

As shown in FIG. 6A, the membership function of the mix damper opening (MIX) is set such that ZR is set so that the membership value on the left becomes 1 from 0% and 100 on the right. %, PS, PM and PL are set. Similarly, the blower voltage (V _B ) and the amount of solar radiation (SRA) are set as shown in FIGS. 6B and 6C.

Furthermore, the blower voltage correction amount ([Delta] V _B), mixing damper opening correction amount (ΔMIX), like the outside air temperature (Ta), FIG. 7 (a), the set as shown in (b) I have. Further, the delay time (τ) is set as shown in FIG. 7C, similarly to the mix damper opening (MIX). As described above, since the membership function is set in several steps such as ZR and PS according to each of the inside and outside conditions, the inside and outside conditions can be captured in a manner closer to human sense. In addition, since membership functions are similarly set for outputs such as blower voltage, the output can be matched to human senses.

On the other hand, the fuzzy rules are shown in FIGS.
Is as shown in, for example, the rule 1 in FIG. 8, Ta = NM, Tr = NM, Tw = NM, T E = N
When M and Ts = PS, MIX = PL and V _B = PM are determined. This is because when the inside and outside conditions such as the outside air temperature (Ta) are lower than in the comfortable air-conditioning state and the set temperature is set slightly higher, the mix damper opening (M
IX) is considerably increased, and the blower voltage (V _B ) is increased. As described above, since a plurality of fuzzy rules are set according to the inside / outside conditions, even if the inside / outside conditions change in a complicated manner (for example, when the engine is started), it is possible to flexibly cope with the changes.

The first fuzzy inference is based on FIG.
Is performed as shown in the flowchart of FIG. Step S
In 10, input signals of the outside air temperature (Ta), the vehicle interior temperature (Tr), the cooling water temperature (Tw), the evaporator passing air temperature (T _E ), and the set temperature (Ts) are output from the sensors 11 to 14 and the switch 16, respectively. take in.

In step S11, FIGS. 5 (a) to 5 (e)
, A membership function is selected according to each of the signal values, and the membership value is determined. For example, when the outside air temperature is 22.5 ° C., as shown in FIG. 5A, PS and PM are selected as the membership functions, and both the membership values are 0.5.

In step S12, based on the membership function selected for each input signal in step S11,
For each fuzzy rule shown in FIG. 8, the minimum value of the membership value of the antecedent part (IF part) is obtained (MIN operation). For example, in rule 1, the Ta NM is 0.8 and the Tr NM is 0.8.
9, NM of Tw is NM of 1, T _E 0.5, if NM of Ts is 0.8, the membership values determined in 0.5.

In step S13, the membership function of the consequent part (mix damper opening is shown in FIG. 6 (a), blower voltage is shown in FIG. 6 (b)) for each fuzzy rule shown in FIG. Cutting is performed with the minimum value of the membership value obtained in step S12. For example, the above step S
In the example shown in FIG. 12, the PL is cut at 0.5 as shown in FIG. 6A, and the PM is cut as shown in FIG.
Is cut at 0.5. Thereafter, for the reference blower voltage (V _B ) and the reference mix damper opening (MIX), the logical sum of the fuzzy outputs cut for each fuzzy rule is obtained (MAX operation).

In step S14, the center of gravity of the logical sum of the fuzzy outputs obtained in step S13 is calculated, and the values of the reference blower voltage (V _B ) and the reference mix damper opening (MIX) at the position of the center of gravity are calculated to defuzzify. By doing so, this is output.

Further, the second fuzzy inference is based on the first fuzzy inference.
Similar to the fuzzy inference, it is performed as shown in the flowchart of FIG. In step S20, the temperature inside the vehicle (T
r), the amount of solar radiation (SRA), the output value obtained by the first fuzzy inference, the blower voltage (V _B ), and the mix damper opening (MIX). In step S21, a membership value is obtained for each of the read data, and the MIN is calculated in step S22 according to the fuzzy rule shown in FIG.
Calculation, MAX calculation in step S23, and step S2
In step 4, the defuzzification is performed to output the blower voltage correction amount (ΔV _B ) and the mix damper opening degree correction amount (ΔMIX).

As described above, in the above embodiment, each sensor 1
Based on the input signals from 1 to 14 and the temperature setting switch 16, the internal and external conditions are captured in an amount corresponding to human senses,
In addition, since the blower voltage (V _B ) and the mix damper opening (MIX) are output by comprehensively judging this according to the fuzzy rules that match the human senses, it is easy to grasp the correlation between the two. A favorable air condition for the occupant can be obtained.

The blower voltage correction amount is calculated based on the reference blower voltage (V), the reference mix damper opening (MIX), the vehicle interior temperature (Tr) and the solar radiation (SRA) obtained by the first fuzzy inference. Since the calculation is performed by the second fuzzy inference, the control method is simpler than in the conventional case where each input signal is individually corrected.

[0030]

As is apparent from the above description, according to the air-conditioning control method for a vehicle air-conditioning system according to the present invention, the air-conditioning state is controlled by fuzzy inference. A comfortable air-conditioning state can be obtained. Moreover, in the fuzzy inference, the amount of solar radiation that greatly affects the air conditioning control is fuzzy inferred separately from other elements, and the obtained value is used as a correction amount. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of an automotive air conditioner according to the present embodiment.

FIG. 2 is a flowchart illustrating an air conditioning control method according to the embodiment.

FIG. 3 is a flowchart illustrating a first fuzzy inference of FIG. 2;

FIG. 4 is a flowchart illustrating a second fuzzy inference of FIG. 2;

FIGS. 5A to 5E are diagrams showing membership functions in antecedent variables.

FIGS. 6A and 6B show membership functions of a blower voltage and a mix damper opening in consequent variables, respectively, and FIG. 6C shows a membership function of insolation in the antecedent part. FIG.

FIGS. 7A to 7C are diagrams respectively showing a correction amount of a blower voltage, a correction amount of an opening degree of a mix damper, and a membership function of a delay time in variables of a consequent part.

FIG. 8 shows a fuzzy rule of the first fuzzy inference.

FIG. 9 shows a fuzzy rule of the second fuzzy inference.

[Explanation of symbols]

1 ... Blower, 2 ... Blower motor, 3 ... Evaporator, 5
... mix damper, 6 ... actuator, 7 ... heater core, 10 ... control device, 11 ... evacuation sensor, 12 ... water temperature sensor, 13 ... outside air sensor, 14 ... inner air sensor, 15 ... sunshine sensor, 16 ... temperature adjustment switch.

Continuation of front page (72) Inventor Ryoichiro Kihara 5658 Yoshikawa, Hachihonmatsu-cho, Higashihiroshima-shi, Hiroshima Prefecture Within Japan Climate Systems Corporation (58) Field surveyed (Int.Cl. ⁶ , DB name) B60H 1/00 101

Claims (1)

(57) [Claims] An air to be heated by a heater core by calculating a blower voltage and controlling a mixing damper opening in accordance with internal and external conditions such as an outside air temperature, a room temperature, and a solar radiation amount. In the air-conditioning control method for an automotive air-conditioning system in which the air flow is controlled by adjusting the amount of air, a first fuzzy inference is performed based on internal and external conditions other than the amount of solar radiation to calculate a reference blower voltage and a reference mix damper opening. Calculating the blower voltage correction amount and the mix damper opening correction amount by performing a second fuzzy inference based on the calculated reference blower voltage and reference mix damper opening degree and at least internal and external conditions including the amount of solar radiation. An air-conditioning control method for a vehicle air-conditioning device.