JPH03148321A - Controller for automobile air conditioner - Google Patents

Abstract

PURPOSE:To conduct the control of air conditioning minutely and with precision, by selecting the larger one out of an air blower revolution number based on a control parameter by heat load and an air blower revolution number based on an open air temperature and a target room temperature by a set temperature, and conducting control. CONSTITUTION:A common control parameter used for the control of an air mix door 16 and an air blower 7 is operated by means of a means 100, and also, the target opening of the air mix door 16 is operated by means of a mean 200 on the basis of the control parameter, and at the same time, the air mix door 16 is driven and controlled by means of a means 300 on the basis of the target opening. Meanwhile, a target room temperature is operated by means of a means 400. Also, the 1st revolution number of the air blower 7 is operated by means of a means 500 on the basis of the control parameter, and at the same time, the 2nd revolution number of the air blower 7 is operated by means of a means 600 on the basis of the target room temperature. And the selection of the larger one out of the 1st revolution number and the 2nd revolution number is made by means of a means 700, and at the same time, the air blower 7 is driven and controlled by means of a means 800 in accordance with the selected revolution number.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device that improves the control of the amount of air blown, especially in an air conditioner for an automobile.

(Prior art) When automatically controlling an automobile air conditioner, the vehicle interior temperature T
,. A widely known method is to form control parameters to be used for temperature control based on heat load conditions such as outside temperature Ta, solar radiation amount Q8, and set temperature T4, and to drive and control each air conditioning device based on these parameters. This is where I am.

More specifically, for example, using the overall signal T as shown in equation (1) as the M control parameter, T=^-T, )
B-T, +C-Q, -D-T, +1・Equation (1) (However, A-E4 is a calculation constant.) Rotating V of the blower,
and the opening degree θ8 of the air mix door are controlled based on this comprehensive signal T so that the characteristics shown in FIG. 4 are obtained.

Therefore, when T is large and the cooling load is large, the blower is rotated at high speed and the air mix door is set to the full cool position, and when T is small and the heating load is large, the blower rotation speed is set to high speed. and set the air mix door to the full heat position, and in a stable state where T is in a predetermined intermediate range, the blower is set at low speed so that the opening degree of the air mix door changes according to the size of T. What?

ing.

(Problem to be Solved by the Invention) In this type of system, once the temperature inside the vehicle is stabilized and control is performed in the intermediate region of T, even if the air outlet temperature is slightly changed by the temperature setting device, However, since the amount of air blown is small, there is a disadvantage that it is difficult to feel that the settings have been changed. Especially when the outside air is low (0 to Iθ℃) or when the outside air is high (
This feeling is especially strong when the external environment (30 to 35 degrees Celsius) has a large effect on the heat load inside the vehicle, or when you are sitting in the back seat where the airflow does not reach much.

In order to prevent this inconvenience, for example, Japanese Patent Laid-Open No. 61-1358
As shown in Japanese Patent No. 12, it is also conceivable to use a technique in which the lower limit value of the amount of air blown is changed depending on the outside temperature.

However, even with this, the amount of air blown does not change in response to a slight change in the set temperature, so the same problem remains and the room temperature cannot be changed quickly.

Therefore, in this invention, the above-mentioned problems are solved, and in addition to this, it is possible to experience the temperature change inside the vehicle even if the set temperature is slightly changed when the temperature control inside the vehicle is stable. An object of the present invention is to provide a control device for an air conditioner for an automobile that can quickly change the temperature inside the vehicle.

(Another Means to Solve the Problem) As shown in FIG. , an air blower 117 that varies the air blowing capacity, and an iIilf2I parameter calculation that calculates common control parameters used for the air mix door 16 and the air blower tsm based on heat load conditions including at least the vehicle interior temperature and the set temperature. Means 100 and this control parameter calculation means 1
a target opening calculation means 200 that calculates the target opening of the air mix door 16 based on the output of 00, and an air controller that drives the air mix door 16 according to the calculation result of the target opening calculation means 200 mix door drive urn
means 300, target indoor temperature calculating means 400 for calculating a target indoor temperature based on the outside air temperature and the set temperature, and a first means for calculating the rotational speed of the air blowing amount based on the output of the control parameter calculating means 100. rotation speed calculation means 500,
a second rotational speed calculation means 60G for calculating the rotational speed of the blower based on the output of the target indoor temperature calculation means 400;
a selection means 700 for selecting the larger of the rotation speed calculated by the first rotation speed calculation means 500 and the rotation speed calculated by the second rotation speed calculation means 600; The present invention further includes a blower drive control means 800 that drives and controls the amount of air blown based on the calculation result of the selected rotational speed calculation means.

(Function) Therefore, it is calculated based on the heat load condition; The rotation speed of the blower can be sensitively changed by changing not only the outside temperature but also the set temperature, so if you select the higher rotation speed, the rotation speed of the blower will essentially change. The lower limit of can be corrected by a slight change in the set temperature, and therefore the above object can be achieved.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, the automobile air conditioner is provided with an inside/outside air switching device 2 on the most upstream side of an air conditioning duct 1, and this inside/outside air switching device 2 is located at a portion where an inside air population 3 and an outside air population 4 are separated. An intake door 5 is arranged, and this intake door 5
By operating the actuator 6, the air conditioning duct l
The air introduced inside can be selected between inside air and outside air.

The blower 67 sucks air into the air conditioning duct 1 and blows it downstream, and an evaporator 8 and a heater core 9 are provided behind the blower 7.

The evaporator 8 includes a compressor lO, a capacitor 11
, liquid tank 12 and expansion valve 13
The compressor 10 is connected to the engine 14 of the automobile via an electromagnetic clutch 15, and is controlled on and off by connecting and connecting the electromagnetic clutch 15. Further, the heater core 9 is configured to circulate cooling water of the engine 14 and heat the air.

An air mix door 16 is provided in front of the heater core 9, and by adjusting the opening degree of the air mix door 16 with an actuator 17, the air passing through the heater core 9 and the air bypassing the heater core 9 can be separated. The amount is changed so that the temperature of the blown air is controlled by ilJ.

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, which open into the vehicle interior 21, and mode doors 22a and 22-b are provided in the divided portions. , this mode door 22a,
By operating 22b with the actuator 23, a desired blowing mode can be obtained.

25 is a vehicle interior temperature sensor that detects the temperature Tr of the air inside the vehicle, 26 is a solar radiation sensor that detects solar radiation MQs, and 27 is an outside temperature sensor that detects the outside temperature T, and these signals are used for signal selection. A/
The signal is input to the D converter 30, where it is converted into a digital signal and input to the microcomputer 3I. Furthermore, an output signal from the operation panel 32 is input to the microcomputer 31 .

The operation panel 32 is an A/
C switch 33 and E for economical compressor control
CON switch 34, and each air conditioner enters the automatic control mode when any one of these switches is pressed. The operation panel 32 also includes an OFF switch 35 that stops the operation of the air conditioner, a DEF switch 3b that sets the blowout mode to the defrost mode, and a set temperature T4 in the vehicle interior.
A temperature setting device 37 for setting the air blowing capacity, a blowing capacity setting device 38 for setting the blowing capacity, a blowing mode setting device 39 for setting the blowing mode other than the defrost mode, and a suction mode setting device 40 for setting the suction mode. The temperature, air blowing capacity, blowing mode, and suction mode are displayed on the display section 42 controlled by the microcomputer 31 via the display circuit 41.

The microcomputer 31 includes a central processing unit (CPU) (not shown), a read-only memory (ROM), a random access memory (RAM), and an input/output board (Ilo).
etc., which are well known per se, and based on the various human input signals mentioned above, the above-mentioned actienitaro, 1? , 23, outputs a control signal to the motor of the blower 7 and the electromagnetic clutch 15 via drive circuits 43a to 43e, respectively, and controls each door 5.
16.22a.

22b, rotation control of the blower 7, and onlorr 13?2i of the electromagnetic clutch 15.

In FIG. 3, an example of a control routine for the air mix door 16 and the blower 67 by the microcomputer 31 described above is shown as a flowchart, and the following description will be made based on this flowchart.

When the power is turned on, the micro combinator 31 changes the vehicle interior temperature Tr and the outside temperature T in step 50.
, , solar radiation Q, set temperature T, etc., are sequentially transmitted to the multiplexer 29 and the A/D converter 30.
or directly, and store it in a predetermined area of RAM.

Then, in the next step 52, common control parameters used to control each air conditioner are set, for example (
1) It is obtained in the form of a total signal T as shown in the equation.

T=^-rr+n-rm+c-Qs-o-ra+訃-(
1) Formula, where A-E represents a calculation constant, and T indicates that the larger the value, the greater the cooling load in the vehicle interior, and the smaller the value, the greater the heating load.

After the total signal is calculated, the process proceeds to step 54, where the opening degree θ8 of the air mix door 16 is calculated from the characteristic pattern shown in FIG. 4 based on the total signal T using the same method as before, and then the next step Air mix door 1 at 56
During this time, a command signal is output to the drive circuit 43b to move the angle .theta.6 to the degree .theta.8.

In the next step 58, the rotational speed V of the blower 117 is calculated in the form of the voltage applied to the blower motor from the characteristic pattern shown in FIG. 4 based on the total signal T using a method similar to the conventional method.

Thereafter, in step 60, the target indoor temperature T7 is calculated, and in step 62, the rotation speed 2 of the blower 7 is calculated based on this target indoor temperature angle T. More specific methods are shown in Figures 5 and 6. Figure 5 is for low outside air (e.g. 0 to lO-℃), and Figure 6 is for high outside air (e.g. 20 to 40°C). used.

The control method is the same in either case, so to explain the case when the outside air temperature is low, first, in FIG. 5(a), the target indoor temperature TN is predetermined based on the outside air temperature T and the set temperature T4. calculations are performed to obtain a predetermined characteristic pattern. This T, is large in a short time when the outside temperature T1 (
Because it does not change, the temperature increases in a short period of time due to T (it does not change, but even with the same T, a gradual change can be obtained in response to a change in the set temperature T1). In this embodiment, when the set temperature changes by 1°C, the target room temperature T also changes by 1°C.

After the T-work is obtained, in Fig. 5 (mountain),
From this T4 value, the rotation speed v2 of the blower 7 is determined as a voltage to be applied to the motor of the blower 817 based on a predetermined characteristic pattern. The characteristic pattern of this rotational speed is determined such that when T is, for example, 25°C or higher, V increases as rm increases. Therefore, v2 is sensitive to changes in the set temperature. Note that when the outside air temperature is high, the target indoor temperature T is set to a smaller value than when the outside air temperature is low (Fig. 6 (a)).
The value of v2 is determined so that it becomes thicker as T decreases when T is below 24°C (Fig. 6 (b)).
.

Then, in step 64, the rotation speed v1 of the blower obtained in step 58 is compared with the rotation speed V2 of the blower obtained in step 62, and if Vl is larger, the process proceeds to step 66, and the blower is adjusted using v2. 7, and if Vl is large, proceed to step 68, and this vl
to drive the air flow rate.

Therefore, if the blower is controlled using only the overall signal T, the set temperature T4 in equation (1) will change slightly in the intermediate region where the rotational speed of the airflow amount F in FIG. 4 is stable at LOW. (e.g. ±1°C), T
itself does not change significantly, only the opening degree θ of the F-mix door changes while the rotation speed of the blower is maintained at LOW.However, if the control as in this example is used, the set temperature will change. Since the target indoor temperature T changes with certainty, the ventilation 117 is based on T (T instead of V).

It can be controlled by <Vl based on , and in addition to changing the opening degree of the F-mix door 16 in the above-mentioned intermediate region, the amount of air blown can also be changed.

In the above-mentioned embodiment, a limiting means may be added to prevent the force v2 from changing if there is a force for changing the set temperature exceeding a predetermined value.

(Effects of the Invention) As described above, according to the present invention, the rotation speed of the blower is determined based on the III control parameter obtained from the heat load conditions, and the target indoor temperature is determined based on the outside temperature and the set temperature. By selecting the larger rotation speed of the blower determined based on the temperature, it is possible to change not only the opening degree of the air mix door but also the amount of air blown by a slight change in the set temperature. Therefore, even when the temperature control inside the vehicle interior is stable, if you change the set temperature, you can obtain a commensurate increase in air volume, and you will be able to reliably experience the temperature change inside the vehicle interior. Furthermore, since the amount of air blown changes even with a slight change in the set temperature, there is an advantage that the temperature in the vehicle interior can be quickly shifted to the target temperature.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram showing this invention, Fig. 2 is a configuration diagram showing an automotive air conditioner according to the invention, and Fig. 3 shows an example of control operation of an air mix door and a blower by a microcomputer used in the above. Flowchart, Figure 4 is a characteristic diagram showing the relationship between the overall signal, the rotation speed of the blower, and the opening degree of the air mix door, and Figures 5 and 6 are the target indoor temperature and the relationship between the rotation speed of the blower and Fig. 5 shows the characteristics when the outside air is low, and Fig. 6 shows the characteristics when the outside air is high. 7...Blow air, 9...Heater core, 16... Air mix door, 100... control parameter calculation means,
200...Target opening calculation means, 300...Air mix door drive control means, 400...Target indoor temperature calculation means, 500...First rotation speed calculation means, 600...
・Second rotation speed calculation means, TOO... selection means, 80
0...Blower drive control means.

Claims (1)

[Claims] An air mix door that varies the ratio of air passing through a heater core to air that bypasses it, an air blower that varies air blowing capacity, and a heat load condition that includes at least a vehicle interior temperature and a set temperature. control parameter calculation means for calculating a common control parameter used to control the air mix door and the blower based on the control parameter calculation means; and a target opening calculation means for calculating a target opening degree of the air mix door based on the output of the control parameter calculation means. means, an air mix door drive control means for driving and controlling the air mix door according to the calculation result of the target opening calculation means, and a target indoor temperature calculation for calculating a target indoor temperature based on the outside air temperature and the set temperature. means, first rotation speed calculation means for calculating the rotation speed of the blower based on the output of the control parameter calculation means; and first rotation speed calculation means for calculating the rotation speed of the blower based on the output of the target indoor temperature calculation means. a selection means for selecting the larger of the rotation speed calculated by the first rotation speed calculation means and the rotation speed calculated by the second rotation speed calculation means; A control device for an air conditioner for an automobile, comprising: a blower drive control means for driving and controlling the blower based on the calculation result of the rotation speed calculation means selected by the rotation speed calculation means.