JPH05310028A - Air conditioning control method for vehicle - Google Patents

Abstract

PURPOSE:To compensate the difference of apparatus ability that is caused by the change of season, and improve responsiveness, convergence and stability by conducting optimum control according to a season. CONSTITUTION:On the basis of the combination of an outer air temperature To measured by means of an outer air temperature measuring sensor 13 provided at a vehicle and an isolation amount SUN measured by means of an insolation amount measuring sensor 14, the fuzzy reasoning of season is conducted so that season may come to summer from winter via the middle according as the outer air temperature To comes to 'high' from 'low' and the insolation amount SUN comes to 'large' from 'small'. Optimum control according to a season becomes possible by controlling an air conditioning device by means of a control mode set beforehand at every season on the basis of the season reasoned as above. Accordingly, the difference of apparatus ability that is due to season can get to be compensated by control, and responsiveness, convergence and stability can be improved.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A conventional vehicle air conditioner is shown in FIG.

In FIG. 8, 1 is an outside air intake, 2 is an inside / outside air switching damper provided in the outside air intake 1, and 3 is a duct whose one end is continuous with the outside air intake 1. Inside this duct 3, a blower is installed. 4, an evaporator 5, an air mix damper (hereinafter referred to as an A / M damper) 6, and a heater 7 are sequentially arranged, and the other end of the duct 3 includes a face duct 8, a differential duct 9, and a foot duct 10. It is branched.

A face damper 11 is provided in the face duct 8, and a diff-foot switching damper 12 is provided between the diff duct 9 and the foot duct 10.

In addition to this, on the vehicle body, as an air conditioning control sensor, an outside air temperature measuring sensor 13 and a solar radiation measuring sensor 1 are provided.
4, a room temperature measuring sensor 15 and the like are provided.

Reference numeral 16 denotes a controller composed of a microcomputer for controlling the entire air conditioner, and embodies the following control method.

As a conventional control method for such an air conditioner, the control represented by the formula: control amount = A. (Ts-Tr) + B. (Ts-To) + C.SUN is performed. Is common.

Of these, A · (Ts-Tr) in the first term is set by the temperature setting device (not shown) provided on the air conditioning operation panel (not shown) and the room temperature measuring sensor 15. The deviation (Ts-Tr) from the measured room temperature Tr is multiplied by a predetermined constant A, and feedback control is performed so that the room temperature Tr converges to the set temperature Ts.

The second term B. (Ts-To) is the set temperature Ts.
And the outside air temperature To measured by the outside air temperature measurement sensor 13.
Is the deviation (Ts-To) multiplied by a predetermined constant B, and C · SUN in the third term is the solar radiation measurement sensor 14
The solar radiation amount SUN measured by the above is multiplied by a predetermined constant C, and both are feedforward control terms.

[0010]

The conventional control method as described above has the following problems. (1) Since the constants A, B, and C were fixed and controlled throughout the whole season, the responsiveness was poor especially during heavy loads in winter or summer. (2) The above constant A, so that it can be applied throughout the season
Since B and C have to be determined, the determination and adjustment thereof are troublesome, and if the adjustment is insufficient, there is a possibility that there is a disadvantage that the deviation is stable with respect to the set temperature. (3) Since the capacity of the evaporator and the capacity of the heater greatly change depending on the outside air temperature, it is troublesome to adjust the opening degree of the actual A / M damper 6 with respect to the control amount.

In view of the above-mentioned problems of the prior art, the present invention compensates for the difference in the equipment capability depending on the season by performing the optimal control according to the season, thereby providing the response, convergence and An object of the present invention is to provide a vehicle air conditioning control method capable of improving stability.

[0012]

In order to achieve the above object, the vehicle air conditioning control method of the present invention uses an outside air temperature measured by an outside air temperature measuring sensor provided in the vehicle and an insolation measuring sensor provided in the vehicle. Based on the combination with the measured insolation, fuzzy inference of the season from winter to mid-summer as the outside temperature becomes low to high and insolation from small to large, and the inference is made. Based on the season
It is characterized in that the air conditioner is controlled in a control mode preset for each season.

[0013]

[Operation] When the outside air temperature measured by the outside air temperature measuring sensor is low and the amount of solar radiation measured by the solar radiation amount measuring sensor is small, in winter, the outside air temperature is also high and the amount of solar radiation measuring by the solar radiation amount measuring sensor is the same. Is inferred to be summer, otherwise is inferred as a reasonably intermediate season according to a predetermined fuzzy inference rule, and based on the inferred season, a control mode determined for each season is used. Since the air conditioner is controlled, it is possible to perform optimum control according to the season, and it is possible to compensate for the difference in the device capability due to the season by the control, and improve the responsiveness, convergence and stability.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the control method of the present invention is shown in FIGS.
Will be described. It should be noted that all the air conditioners and sensors to be controlled are the same as those shown in FIG. 8, and the description will be given using the reference numerals shown in FIG.

FIG. 1 is a block diagram showing a controller 16 for carrying out the control method of the present invention in a circuit form for convenience. Actually, there is no specific circuit divided in this way, and it is needless to say that they are integrally formed in the microcomputer.

In FIG. 1, reference numeral 17 is a seasonal inference circuit (fuzzy inference I).
And the solar radiation amount measurement sensor 14 is connected, and the outdoor air temperature To changes from low to high based on the combination of the outdoor air temperature To measured by the outdoor air temperature measurement sensor 13 and the solar radiation amount SUN measured by the solar radiation amount measurement sensor 14. , And the amount of solar radiation SUN from small to large, the season is fuzzy inferred such that the season goes from winter to intermediate to summer.

That is, in the seasonal inference circuit 17,
For example, the seasonal grade is obtained based on the outside temperature membership function shown in FIG. 2, the solar radiation membership function shown in FIG. 3, and the following inference rules.

[Fuzzy reasoning I] Reasoning rule Rule 1: If the outside temperature is low (Low), no solar radiation (Non)
Then Winter Rule 2: If the outside temperature is low (Low), the amount of solar radiation is large (Big)
Then Intermediate Rule 3: If the outside temperature is moderate (Medium), no solar radiation
If it is (Non), it is an intermediate rule 4: If the outside temperature is moderate (Medium), the solar radiation is large.
If (Big), Summer Rule 5: If the outside temperature is high (High), no sunlight (Non)
Then Summer Rule 6: If the outside temperature is high (High) and the solar radiation is big (Big)
Then summer, for example, when the outside temperature To is 20 ° C, from Fig. 2 Medium
Grade is 1.0, and if the solar radiation SUN is 400 Kcal / m ² · h, the grade of Non is 0.0.
5 and the Big grade is 0.5.

Therefore, according to the rules 3 and 4, the middle grade becomes 0.5 grade, and the summer grade also becomes 0.5 grade.

In FIG. 1, reference numeral 18 denotes a room temperature control circuit (fuzzy reasoning II), which includes a season reasoning circuit 17 and
Room temperature measuring sensor 15, temperature setting device 19, blower 4, A / M damper 6, inside / outside air switching damper 2, face damper 11 and differential, which are each control unit in the air conditioner.
The foot switching damper 12 is connected to control the air conditioner in a control mode preset for each season based on the season inferred by the season inference circuit 17 described above.

That is, in the room temperature control circuit 18,
For example, the deviation (Ts−) between the set temperature Ts and the room temperature Tr shown in FIG.
Based on the membership function of Tr), the membership function of the time change (current deviation minus 15 seconds before) shown in FIG. 5, and the following inference rules (in the case of winter season). ,
Controls each control unit in the air conditioner.

[Fuzzy Inference II] Inference Rule Rule 1: If it is significantly cold (E = PB), the temperature rise is small (ΔE
= NS), there is no change in the air flow rate and no change in the A / M damper Rule 2: If it is moderately cold (E = PM), the temperature rises a little
If it is (ΔE = NS), the air flow rate will be slightly reduced, and the A / M damper will not change Rule 3: If it is a little cold (E = PS), the temperature rise will be a little (ΔE = N
If it is S), reduce the air flow a little and add a little A / M damper.
Control to Cool side Rule 4: If it is moderate (E = ZO), temperature rise is a little (ΔE
= NS), the air flow rate is reduced a little, and the A / M damper is controlled to the Cool side a little. Rule 5: If it is a little hot (E = NS), the temperature rise is a little (ΔE = N
If S), there is no change in air flow and a little A / M damper
Control to Hot side Rule 6: Moderate (E = ZO), no temperature change (ΔE
= O), there is no change in the air flow rate and no change in the A / M damper [when the set temperature Ts is changed to the rising side] Rule 7: If it is moderately cold (E = PM), the temperature also changes significantly
If (ΔE = PB), the air flow rate will be greatly increased and A / M
Damper is also greatly controlled to the Hot side [When the set temperature Ts is changed to the lower side] Rule 8: If it is moderately hot (E = NM), the temperature also changes greatly
If (ΔE = NB), the air flow rate is reduced a little and A / M
Damper is greatly controlled to the Cool side Rule 9: If it is a little hot (E = NS), the temperature drop is a little (ΔE = P
If S), there is no change in air flow and a little A / M damper
Control to Hot Side According to this inference rule, for example, at the time of rising, the room temperature Tr gradually rises according to rules 1 to 6 as shown in FIG. 6, and converges to the set temperature Ts in a short time.

Further, when the set temperature Ts is changed to a higher value on the way, the room temperature Tr is ruled by rules 7, 3, as shown in FIG.
When the temperature gradually rises in accordance with 6 ... and decreases to the contrary, the temperature gradually decreases in accordance with rules 8, 9, 6 ..., and quickly converges to the changed set temperature Ts.

Similar to the case where the above season is winter, when the season is intermediate or summer, dedicated control rules are set for each season, and the season, deviation (Ts-Tr), and time change are also set. The three-input grade Min operation is performed to obtain the rule weight, and the output set is obtained.

The output set is converted into a controlled variable by the calculation of the center of gravity.

Further, the inside / outside air switching damper 2, the face damper 11, which controls the outlet, and the diff-foot switching damper 12, and the air conditioner, that is, the evaporator 5 are controlled.
ON / OFF of a compressor (not shown) that supplies refrigerant to the
With respect to, the room temperature control circuit 18 controls, for example, according to the following control rules.

Control Rule 10: If it is winter, the damper is controlled to the outside air introduction side and the foot side, and the air conditioner is turned off Rule 11: If it is intermediate, the outside air introduction side and the foot side /
The damper is controlled so that it blows out to both the face side, and the air conditioner is ON Rule 12: If it is summer, the damper is controlled to the inside air introduction side and the face side, and the air conditioner is ON. The air outlet is the face damper 11 and differential. -By controlling the foot switching damper 12, it is preferable that the foot-side face can be continuously changed.

Regarding the switching control of inside / outside air, when switching to the outside air introduction side, outside air grade> inside air grade + 0.
On the contrary, when switching to the inside air introduction side so that it becomes 1, it is preferable that the outside air grade + 0.1 <inside air grade. It should be noted that the number 0.1 is only an example and is not limited to this.

Also, the ON / OFF control of the air conditioner may be performed in the same manner as the above-mentioned inside / outside air switching control.

[0030]

According to the present invention, since optimum control can be performed according to the season, it is possible to compensate for the difference in the equipment capability depending on the season, thereby improving the responsiveness, convergence and stability.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a control circuit used to carry out a control method of the present invention.

FIG. 2 is a diagram showing an example of an outside air temperature membership function.

FIG. 3 is a diagram showing an example of a solar radiation amount membership function.

FIG. 4 is a diagram showing an example of a membership function of a deviation (Ts−Tr) between a set temperature Ts and a room temperature Tr.

FIG. 5 is a diagram showing an example of a membership function of time change (current deviation−deviation of 15 seconds before).

FIG. 6 is a diagram showing a relationship between room temperature and time at the start of winter.

FIG. 7 is a diagram showing a relationship between room temperature and time when a set temperature is changed.

FIG. 8 is a schematic side view showing an example of a conventional air conditioner.

[Explanation of symbols]

 1 Outside air intake 2 Inside / outside air switching damper 3 Duct 4 Blower 5 Evaporator 6 Air mix damper (A / M damper) 7 Heater 8 Face duct 9 Differential duct 10 Foot duct 11 Face damper 12 Differential-foot switching Damper 13 Outdoor temperature measurement sensor 14 Solar radiation measurement sensor 15 Room temperature measurement sensor 16 Controller 17 Seasonal inference circuit (fuzzy inference I) 18 Room temperature control circuit (fuzzy inference II) 19 Temperature setting device

Claims (1)

[Claims] 1. An outside air temperature is low to high, and an amount of solar radiation is based on a combination of an outside air temperature measured by an outside air temperature measuring sensor provided on a vehicle and an amount of solar radiation measured by an insolation amount measuring sensor provided on the vehicle. From small to large, the season is fuzzy inferred so that the season goes from winter to the middle to summer, and based on the inferred season, the air conditioner is controlled in a preset control mode for each season. A vehicle air conditioning control method characterized by the above.