JPH0194012A - Control device for on-vehicle air conditioner - Google Patents

Abstract

PURPOSE:To improve comfortableness at the time of starting by comparing air capacity obtained from the result of overall operations with air capacity obtained only based on outside air temperature, and selecting smaller air capacity in such a way as to control blower revolutions. CONSTITUTION:An overall signal operating means 510 operates overall signals based on those such as the temperature detected by an outside air temperature detecting means 500, cabin inside temperature and the set temperature. Based on these, air capacity is operated by No.1 air capacity operating means 520. On the other hand, No.2 air capacity operating means 530 operates air capacity only based on outside air temperature detected by the outside air temperature detecting means 500. Then, a selecting means 540 compares both air capacities with each other so as to select smaller one. A blower control means 550 controls the revolution of a blower 5 based on the air capacity selected by the selecting means 540. This constitution controls the capacity of air blast at the time of starting, thereby enabling an improvement in comfortableness.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for controlling the air volume of an automobile air conditioner, particularly at the time of startup.

(Prior art) Conventionally, it is widely known that the air volume of an auto air conditioner is determined from the viewpoint of obtaining a thermal equilibrium state, and a control device such as the one shown in Fig. 6 has been considered as such a device. .

This calculates a comprehensive signal based on a vehicle exterior temperature detection means for detecting the vehicle exterior temperature, at least the vehicle interior temperature Tr, a set temperature Td set by a temperature setting device, and the vehicle exterior temperature Ta detected by the vehicle exterior temperature detection means. and a general signal calculation means, the air volume calculation means calculates the air volume supplied to the vehicle interior according to the calculation result of the general signal calculation means, and the rotation speed of the blower is controlled by the blower control means based on the calculation result. It was designed to do so. More specifically, for example, based on equation (1), the total signal T is calculated by calculating T=(Tr
-25)+ a (Ta-25)-β(Td-25)-
(1) (where α and β are constants), the rotation speed of the blower is determined according to the control pattern shown in Figure 4, and T
is gradually brought closer to 0 to settle into a state of thermal equilibrium.

According to this, when the total signal T is near 0, the blower is rotated at a low speed (Loν) and slowly approaches the equilibrium state, and when T is far from ○.

The blower is rotated at high speed (Hi) to quickly approach the equilibrium state.

(Problem to be Solved by the Invention) However, in the so-called intermediate period when the outside temperature of the vehicle is approximately 10°C to 20°C, when the set temperature Td is set to 25°C, for example, the air conditioner is At the initial stage of startup, the temperature inside the car is almost equal to the temperature outside the car, so when the overall signal T is calculated based on the above formula (1), it deviates significantly from ○, and even though the air volume is not required much, it is more than necessary. This had the disadvantage that it became too large and affected the feeling of the passengers.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a control device for an air conditioner for an automobile that prevents deterioration of the passenger's feeling by regulating the air volume when the air conditioner is activated.

(Means for Solving the Problems) Therefore, the gist of the present invention is to provide a vehicle exterior temperature detection means 500 for detecting the vehicle exterior temperature, and at least the vehicle exterior temperature and vehicle interior temperature detected by the vehicle exterior temperature detection means 500. and a set temperature, and a first air volume calculation means 520 that calculates a target air volume to be supplied into the vehicle interior according to the calculation result from the general signal calculation means 510. , a second air volume calculation means 530 that calculates the air volume based on the detection result by the outside air temperature detection means, using only the outside temperature as a function;
When the air volume level calculated by the air volume calculation means 520 is larger than the air volume level calculated by the second air volume calculation means 530, the calculation result of the second air volume calculation means is used, and when it is smaller, the calculation result is used by the first air volume calculation means. and a blower control means 550 that controls the rotational speed of the blower based on the calculation results selected by the selection means 540.

(Function) Therefore, since the air volume level calculated by the second air volume calculation means is based only on the temperature outside the vehicle, when the air conditioner is started, this air volume level is higher than the air volume level calculated based on the overall signal. Since the smaller air volume level is selected by the selection means, the air volume supplied into the vehicle interior at the time of startup is regulated and an appropriate air volume can be obtained, thus achieving the above-mentioned problem. It is something.

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

In FIG. 2, the automobile air conditioner has an inside air inlet 2 and an outside air inlet 3 on the most upstream side of the air conditioning duct 1, and the inside air inlet 2 and the outside air inlet 3 are divided into two parts. An air switching door 4 is provided, which allows the air to be introduced into the air conditioning duct 1 to be selected between inside air and outside air.

The blower 5 has a motor 5a and a fan 5b rotated by the motor 5a, and the rotation speed of the fan 5b is changed according to the voltage input to the motor 5a, and the fan 5b sends inside air or outside air to the wake of the air conditioning duct 1. It is designed to be sent to the side.

On the downstream side of the blower 5, an evaporator 6 and a heater core 7 are installed.
Further, an air mix door 8 is provided in front of the heater core 7, and the ratio of air passing through the heater core 7 to air bypassing it is controlled by adjusting the opening degree of the air mix door 8. It is now possible to do so.

The last stream side of the air conditioning duct 1 is divided into a defrost outlet 12, a vent outlet 13, and a heat outlet 14, which open into the vehicle interior 15, and a mode door 16, 17 is provided in the divided part. , by opening and closing the mode door 16.17, the blowing mode is changed to the vent mode,
It can be switched to pie level mode, heat mode or defrost mode.

The above-mentioned internal/external air switching door 4. The air mix door 8 and the mode door 16.17 are operated by actuators 18a to 18, respectively.
18c so that it can be moved. The energization of these actuators 18a to 18c and the motor 5a of the blower 5 is controlled in accordance with control signals from the microcomputer 21 via the actuator drive circuits 19a to 19c and the blower drive circuit 20, respectively.

The microcomputer 21 includes a central processing unit CPU, a read-only memory ROM, and a random access memory RAM.
This is a well-known device that includes a clock generator that generates a reference pulse with a crystal oscillator 22, and the like. A multiplexer (MPX) 24 is connected to the microcomputer 21 via an A/D converter 23. This multiplexer (MPX) 24 includes an in-vehicle temperature sensor 25 that detects the in-vehicle temperature Tr. A vehicle exterior temperature sensor 261 that detects the vehicle exterior temperature Ta, a solar radiation sensor 27 that detects the amount of solar radiation Ts, a temperature setting device 28 that sets the set temperature Td, and a potentiometer 29 that detects the opening degree of the air mix door 8 are connected, and input is made from these. The analog signals received are converted into digital signals and selectively input to the microcomputer 21.

The microcomputer 21 also includes position detection sensors 30 and 31 for detecting the position of the mode door 16 and 17.
is connected to input an output signal corresponding to each blowout mode, and each output of the inside/outside air switch 32 that changes the setting of the inside/outside air switching door 4 and the mode switch 33 that changes the setting of the mode door 16, 17. Each signal is input.

Next, an example of the control operation of the microcomputer 21 will be explained from the point of view of air volume control according to the flowchart in FIG. At step 102, the vehicle interior temperature Tr, vehicle exterior temperature Ta, solar radiation temperature Ts, set temperature Td, and output signals from the position detection sensors 30 and 31 are inputted and stored in a predetermined area.

Next, the process proceeds to step 104, and in this step 104, the total signal T, which is the target value for control, is determined by, for example, (2).
Calculate according to the formula.

T=(Tr-25)+A @ ('ra-25)-B
・(Ts-25)-C・(Td-25) ...(2)
However, A, B, and C are constants, and the amount of solar radiation Ts may be excluded from the parameters when calculating the total signal.

Furthermore, in the next step 106, a target air volume is calculated according to a specific basic control pattern as shown in FIG. 4 using the overall signal T as a parameter, and the calculation result is expressed, for example, as a voltage Vc input to the blower. .

Then, in the next step 108, step 10
Based on the signals from the position detection sensors 30 and 31 input in step 2, it is determined whether or not the blowout mode is the defrost mode, and if it is determined that the blowout mode is the defrost mode (
If YES), proceed to step 110 and set the blower 5 to Vc.
If it is determined that the mode is other than that (NO), the process proceeds to step 112. this is,
This is because in the defrost mode, there is no need to change the target air volume because it is necessary to perform demisting.

In step 112, the above-mentioned vehicle exterior temperature sensor 2
It is determined whether or not 6 is malfunctioning, and if it is malfunctioning (YES
), the calculation of Va, which will be described later, cannot be performed accurately, so the process proceeds to step 110 and the blower is driven based on Vc.
If there is no failure (No), the process advances to step 114. Here, a possible method for detecting a failure of the vehicle exterior temperature sensor 26 is to use software to determine that there is a "1 failure" when the output signal is abnormally small or large, exceeding a preset standard. , it may be detected using a hardware device.

Then, in step 114, the air volume is calculated based only on the outside temperature Ta, and the calculation result is represented by the voltage Va input to the blower 5 according to equation (3).

However, D and E are constants, and although Va is calculated by a linear function of Ta, other arithmetic expressions may be used.

In the next step 116, the above-mentioned comparison of Va and Vc is performed, and in this step 116, Va
If it is determined that the input voltage is larger (YES), the process proceeds to step 110, and the blower 5 is driven by the smaller input voltage Vc. On the other hand, if it is determined that VcO is larger (NO), the process proceeds to step 118, and the blower 5 is driven by Va, which is the smaller input voltage. After step 110 or 118, step 120 returns to the main routine.

This allows the outside temperature to drop between 10°C and 2°C, especially during the mid-season.
When the temperature is around 0°C, as shown in Fig. 5, when the air conditioner starts up, the air volume Vc calculated based on the overall signal T is higher than the air volume Va calculated based only on the outside temperature Ta. Since the blower 5 rotates at the level determined by Va in step 118, the air volume does not become larger than necessary. Then, as the air conditioning progresses, the total signal T approaches zero, and V
While a is almost constant because the outside temperature Ta does not vary greatly, VC varies based on the basic control pattern shown in Fig. 4, so at a certain point V a > V
c, and thereafter, in step 110, the blower 5
is rotated at the conventional level determined by Vc.

In this embodiment, the air volume is not regulated at startup only in the defrost mode, but the air volume may not be regulated also in the vent mode or pie level mode.

(Effects of the Invention) As described above, according to the present invention, the amount of air supplied into the vehicle interior when the air conditioner is started is regulated, so the amount of air at the time of starting is reduced during the intermediate period when the amount of air is not so much needed. It does not become larger than necessary, and can prevent the passenger's feeling from deteriorating.

Furthermore, according to this invention, even if you accidentally set the temperature lever to the Co0L side when the outside air is low, or accidentally set the temperature lever to the HOT side when the outside air is high, the air volume at startup can be regulated. This will prevent you from feeling sick due to a large amount of hot air being blown out.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a block diagram showing an embodiment of the control device of the present invention, Fig. 3 is a flowchart showing an example of air volume control of the device in this invention, and Fig. 4 is a diagram showing the air volume and overall FIG. 5 is a diagram showing the relationship between the voltage input to the blower and time; FIG. 6 is a diagram showing the configuration of the prior art. 5...Blower, 500...Vehicle outside temperature detection means, 51
0... General signal calculation means, 520... First air volume calculation means, 530... Second air volume calculation means, 540...
- Selection means, 550...Blower control means 6 Fig. 4 Fig. 5 0-11 hours Fig. 6

Claims (1)

[Scope of Claims] Vehicle exterior temperature detection means for detecting the vehicle exterior temperature; comprehensive signal calculation means for computing a comprehensive signal based on at least the vehicle exterior temperature detected by the vehicle exterior temperature detection means, the vehicle interior temperature, and the set temperature; a first air volume calculation means that calculates a target air volume to be supplied into the vehicle interior according to the calculation result from the comprehensive signal calculation means; and a first air volume calculation means that calculates the air volume as a function only of the outside temperature based on the detection result of the outside air temperature detection means. and when the air volume level calculated by the first air volume calculation means is larger than the air volume level calculated by the second air volume calculation means, the calculation result of the second air volume calculation means is , a selection means for selecting the calculation result of the first air volume calculation means when the air volume is small; and a blower control means for controlling the rotation speed of the blower based on the calculation result selected by the selection means. A control device for automotive air conditioners.