JPH0755611B2 - Automotive air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for an automobile, and more particularly to an automobile which adjusts an adjusting means by using a radiation temperature sensor when the room temperature approaches a room temperature set value to perform air conditioning. The present invention relates to an air conditioner for a vehicle.

2. Description of the Related Art There is a demand for air conditioning by adjusting the temperature, air volume, and air direction by adjusting means, and, for example, an automobile air conditioner as shown in FIG. 8 has been proposed. In this vehicle air conditioner, the inside / outside air switching door 1 is operated by an actuator 2, and the inside air or the outside air is introduced by a blower fan 3 which is a means for adjusting an air volume rotated by a blower fan motor 4 and is passed through an evaporator 5. Cold air is produced. A part of this cold air is passed through the heater core 6 by the air mix door 7 which is a temperature adjusting means to be rotated by the actuator 8 to produce hot air, which is mixed with cold air bypassing the heater core 6 in the downstream region to obtain an appropriate temperature. The wind is used and the actuator 10 is used to rotate the ventilator door 9 which is a means for adjusting the outlet.
An actuator 12 rotates a foot door 11 which is a blowout port adjusting means for switching a blowout port to a foot or a defroster to appropriately blow out conditioned air from the blowout port. Among the outlets, the ventilator outlets 16, 17, 18 and 19 provided facing the occupant sitting in the front seat are provided with the actuator 32.
A wind direction setter 31, which is a wind direction adjusting means connected to the, is swingably attached. A controller 28 which is a control means composed of a microcomputer which receives an information signal from a detection means for detecting an environmental condition required for air conditioning such as the outside air temperature sensor 24, the room temperature sensor 25, the room temperature setting device 26 and the solar radiation amount sensor 27. Is output to the blower fan motor 4 and the actuators 8, 10, 12, 32 to adjust the adjusting means to control the temperature, the air volume, the air direction, and the air outlet.

(Similar to this is Japanese Patent Laid-Open No. 57-15008.) Problems to be Solved by the Invention However, in such a conventional automobile air conditioner, the room temperature sensor 25 in the vehicle interior detects the problem. The adjusting means was adjusted by the difference between the room temperature set and the room temperature set value set by the room temperature setting device 26, and the air conditioning was performed. Therefore, when the room temperature is close enough to the room temperature set value set by the occupant, even if the insolation is strong, the environment (temperature, humidity, radiation) , Convection) was not added at all, and there was a difference in the sensation of the occupant. In other words, people do not feel the heat, cold, or comfort at the mere temperature, but because they feel factors such as airflow and radiant heat, there is a gap between the feeling and the feeling when controlled at room temperature. There was a problem that did not give.

Therefore, the present invention has been made by paying attention to such a conventional problem, and a radiant temperature sensor for detecting a radiant temperature is used to perform air-conditioning control close to the sensation of the occupant for further comfort. It is an object of the present invention to provide an air conditioning system for an automobile that can obtain the above.

Means for Solving the Problems In order to achieve this object, the vehicle air conditioner according to the present invention is provided with a radiation temperature sensor for detecting the radiation temperature as shown in FIG. 1 and is detected by a room temperature sensor. A second differential temperature detecting means for detecting a first differential temperature between the room temperature and a room temperature set value set by the room temperature setting device is provided, and a second differential temperature detection for detecting a second differential temperature between the room temperature set value and the radiation temperature. Means for controlling the air adjusting means based on the first differential temperature when the first differential temperature is equal to or higher than a predetermined value, and the air adjusting means based on the second differential temperature when the first differential temperature is equal to or lower than the predetermined value. A control means for controlling is provided.

Embodiment Hereinafter, the present invention will be described with reference to the drawings.

2 to 4 show a first embodiment of the present invention.
In the structure shown in FIG. 2, the same parts as those in the conventional technique are designated by the same reference numerals, and a duplicate description will be omitted. The radiant temperature sensor 30 is a vehicle interior as a detection unit that detects a thermal environment condition,
For example, it is attached to the back of the front seat 15 or the instrument panel 33, etc., and is input to a controller 28 which is a control means composed of a microcomputer. The radiation temperature sensor 30 is, for example, as shown in FIG.
As shown in (b), the container 30a for performing radiant heat transfer and convective heat transfer with the air flow is provided with a sensing unit 3 including a thermistor.
The container 30a is a black sphere or a hemisphere which has a large thermal conductivity and is provided around the periphery of 0b.
A lead wire 30d passing through 30c takes out a signal from the sensing unit 30b. This uses the principle of a glove thermometer, and this glove thermometer is sensitive to changes in solar radiation and air flow. FIG. 3 (a) is suitable for being attached to an appropriate measurement position in the passenger compartment as it is, and FIG. 3 (b) is, for example, a plate 30e attached to the surface of the front seat 15 through a sled 30c. 30d is provided so as to penetrate therethrough, and the container 30a is attached to the sensing portion 30b with an adhesive 30f.

Next, the operation of the control means of the automobile air conditioner having the above-mentioned configuration will be described with reference to the flowchart shown in FIG.

First, in step 101, the outside air temperature Ta detected by the outside air temperature sensor 24, the room temperature Tic in the vehicle interior detected by the room temperature sensor 25, the room temperature set value Tset set by the room temperature setting device 26, and the solar radiation sensor
The solar radiation amount S detected at 27 and the radiation temperature Tg detected at the radiation temperature sensor (glove thermometer) 30 are input to the controller 28 as data.

In step 102, whether the room temperature Tic is close to or far from the room temperature set value Tset, or more specifically, the first temperature difference detecting means for detecting the first room temperature which is the difference between the two is within the predetermined value. Judge whether it is included or not. In this example, it is determined whether the absolute value of the deviation is less than 2 ° C. When the first temperature difference, which is the deviation, is within this condition, step 10
If the sensation temperature Tr of the occupant is set to the radiant temperature Tg of the radiant temperature sensor 30 and the first temperature difference, which is the deviation, is not within this condition (when the temperature is equal to or higher than the predetermined temperature), the process proceeds to step 104. Then, the sensing temperature Tr is set to the room temperature Tic.

In step 105, the second differential temperature detecting means for detecting the second differential temperature, which is the deviation between the perceived temperature Tr and the room temperature set value Tsec, calculates the second differential temperature, and the air conditioning means 1 based on the calculated value. Calculate the blower fan applied voltage setting value Vfan. The blower fan motor 4 is driven by the blower fan applied voltage setting value Vfan, and the air volume is adjusted by the rotation of the blower fan 3. That is, when the deviation is near 0 ° C., the thermal environment in the vehicle compartment is good, so the applied voltage is kept low and the blower fan 3 has a small air flow rate (corresponding to fan L ₀ ) and the deviation is small. If it is large, the applied voltage is kept high and constant to increase the air flow rate of the blower fan 3 (corresponding to fan Hi), and if the deviation is in the middle of this, the blower changes linearly according to the deviation. The applied voltage setting value Vfan to the fan motor 4 is calculated.

In step 106, the target outlet temperature Tof is calculated based on the input data value in step 101 and the calculated value of the sensing temperature Tr in steps 103 and 104. This target outlet temperature Tof is expressed by the following equation: Tof = A.Ta + B.Tr + C.Tset + D.S + E ....
Calculated by (1). Here, A, B, C, D and E are constants.

In step 107, the target outlet temperature Tof calculated by the equation (1)
Based on the above, the opening degree X of the air mix door 7, which is one of the air adjusting means, is calculated. The opening degree X is calculated by the following equation: X = F · Tof + G (2) Here, F and G are constants.

In step 108, the opening Xv of the ventilator door 9 is calculated based on the opening X of the air mix door obtained from the equation (2). This opening degree Vv is calculated by the following equation, that is, Xv = H · X + I (3). Here, H and I are constants.

In step 109, the opening degree Xf of the foot door 11 is calculated based on the air mixing door opening degree X obtained from the equation (2). This opening Xf is calculated by the following equation, that is, Xf = J · X + K (4). Here, J and K are constants.

In step 110, the blower fan applied voltage setting value Vfan calculated in step 105 is output to the blower fan motor 3, and in step 111, the opening X, Xv, Xf calculated in steps 107, 108, 109 is set for each door actuator 8, 10 ,. It outputs to 12 and sets each door 7,9,11 to a predetermined opening. When one loop is completed in this way, the process returns to step 101 and this loop is repeated again.

According to the first embodiment described above, steps 102, 103, 104
As can be seen from the above, when the first temperature difference, which is the difference between the room temperature and the room temperature set value, is greater than or equal to the predetermined value, air conditioning is performed at the first temperature difference that is the difference between the room temperature Tic and the room temperature set value Tset, and the room temperature Tic is When approaching the room temperature set value Tset, the radiation temperature Tg and the room temperature set value Ts
Air conditioning is performed at the second differential temperature which is the difference from et. For this reason, immediately after the start of air conditioning, the burning condition in the passenger compartment can be sensitively sensed and rapid cooling can be performed, and after entering the steady state, air conditioning should be performed by the signal from the radiant temperature sensor that is closest to the occupant's skin sensation. As a result, you can always get a comfortable air-conditioning condition.

A flow chart is shown in FIG. 5 as a second embodiment of such control means.

First, in step 201, various data of the outside air temperature Ta, the room temperature Tic, the room temperature set value Tset, the solar radiation amount S, and the radiation temperature Tg are input to the controller 28.

In step 202, the blower fan applied voltage set value Vf is set based on the first temperature difference which is the deviation between the room temperature Tic and the room temperature set value Tset.
Calculate an.

In step 203, the target outlet temperature Tof is set to the outside air temperature Ta and the room temperature.
From Tic, room temperature set value Tset, and solar radiation S, Tof = A ・ Ta + B ・
It is calculated based on the formula of Tic + C · Tset + D.

Then, in step 204, the air mix door opening degree X is calculated from the equation X = F · Tof ² + G · Tof + H using the target outlet temperature Tof.

Further, in step 205, the outlet mode, which is one of the air conditioning means, is vented (mainly blows out toward the upper body of the front seat occupant) from the target outlet temperature Tof, and bi-level (both upper body and lower body of the front seat occupant). (Blow out) or heater (blow out to the feet of the front seat occupant).

In step 206, it is determined whether the outlet mode is the vent mode, and if it is the vent mode (cooling state), the step
If it is not in the vent mode (cooling or bi-level), the process proceeds to step 207.

In step 207, the first differential temperature detecting means for detecting the first differential temperature, which is the difference between the room temperature Tic and the room temperature set value Tset, is used to calculate the first differential temperature, and the absolute value is calculated from the preset deviation value ΔT ° C. Is also large or small. Then, when the absolute value is large, that is, when the room temperature Tic is still far from the room temperature set value Tset, the process proceeds to step 208.

In step 208, since the room temperature Tic is sufficiently separated from the room temperature set value Tset and is not yet close to the steady state, the vent blowing mode is set to the concentrated mode so that the wind is concentrated on the occupant and the sensation is quickly approached to the room temperature set value Tset. This focused mode
The wind direction setter 31 provided at each of the outlets 16, 17, 18, and 19 in FIG. 2 is made to stop the swinging state to concentrate the wind on the occupant.

In step 207, if the first temperature difference, which is the difference between the room temperature Tic and the room temperature set value Tset, is small, that is, if the room temperature Tic approaches the room temperature set value Tset, the process proceeds to step 209.

In step 209, since the room temperature Tic approaches the room temperature set value Tset and is close to the steady state, the radiation temperature Tg and the room temperature set value detected by the radiation temperature sensor 30 that sharply changes with the airflow or the radiant heat instead of the room temperature Tic. Based on the second temperature difference, which is the difference (Tg-Tset) from Tset, the vent blowing mode is continuously switched to concentration and diffusion.

That is, when the second temperature difference, which is the difference between the radiant temperature Tg and the room temperature set value Tset, is smaller than ΔTg ₁ , the wind direction setting device 31 is swung to the diffusion mode to eliminate the annoyance that the wind is concentrated on the occupant. When is greater than ΔTg ₂ , the wind is concentrated on the occupant to bring the sensation of the occupant close to the room temperature set value Tset. Also, when Tg ₁ and Tg ₂ are between, concentration and diffusion are repeated alternately.

In step 210, a signal from the controller 28 is output to the control actuator 32 based on the mode determined in steps 206, 208 and 209, and the wind direction setting device 31 is driven according to each mode.

In step 211, the applied voltage setting value Vfan is output to the blower fan motor 3 calculated in step 202.

In step 212, the door actuators 8, 10, 1 are adjusted so that the opening degree or the mode obtained in steps 204, 205 is set.
Output to 2.

When one loop is completed in this way, the process returns to step 201 and the loop is repeated again.

In step 207, the temperature difference is determined by the first temperature difference, which is the difference between the room temperature Tic and the room temperature set value Tset, and is divided into steps 208 and 209. However, except for steps 207 and 208, only step 209 is also good. It was found by experiments that various results were obtained. In this case, there is an advantage that it is simple because only one type of temperature difference is used for controlling the air outlet.

FIG. 6 and FIG. 7 show the experimental results of the outlet control of this embodiment when the heat load is high and when the heat load is low.
As shown in FIG. 6, when the heat load is high, concentrated blowout occurs. Then, when the room temperature Tic approaches the room temperature set value Tset and the first temperature difference ΔTg, which is the difference between the set temperature and the room temperature, falls within a predetermined value (ΔTg ₁ ), the blowing mode is changed from the concentrated mode to the diffusion mode (point A). . At that time, if the difference between the radiant temperature Tg and the room temperature Tic is within a predetermined range (ΔTg _{1 to} ΔTg ₂ ), the diffusion mode does not immediately become a complete diffusion mode, but rather the concentration mode and diffusion mode as shown in step 209. Repeat the transition. After that, when the second temperature difference, which is the difference between the radiant temperature Tg and the room temperature set value Tset, becomes smaller than the set difference (ΔTg) (point B), complete diffusion blowing is performed.

On the other hand, as shown in FIG. 7, when the heat load is low, concentrated blowout occurs initially, but when the room temperature Tic is sufficiently close to the room temperature set value Tset (point A), when the heat load is small, the room temperature set value Ts is set.
Since the second temperature difference, which is the difference between et and the radiation temperature Tg, is extremely small (ΔTg ₁ or less), the concentrated blowoff immediately changes to the diffuse blowoff.

As described above, in the present embodiment, not only the temperature control but also the signal of the radiant temperature sensor 30 is used to control the air outlet having the most influence on the cooling sensation. Can be obtained.

As described above, according to the present invention, when the room temperature is far from the room temperature set value, the sensation temperature of the occupant is represented by the room temperature that is responsive to temperature changes and is easy to measure. Air-conditioning is controlled by the first temperature difference, which is the difference between the room temperature and the room temperature set value, and when the room temperature approaches the room temperature set value, the radiant temperature of the radiant temperature sensor that can accurately measure the effect of radiant heat or airflow is used. Since the air conditioning is controlled by the second temperature difference, which is the difference between the radiant temperature and the room temperature set value, the occupant's sensation and the thermal environment can correspond well, and the occupant's air conditioning comfort can be improved. .

That is, in a steady state where the room temperature Tic is sufficiently close to the room temperature set value Tset, for example, even when the radiant heat such as solar radiation is large, it immediately becomes a concentrated blowout or a full cool state, and it is possible to improve the comfort feeling of air conditioning. Have.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the claims of the present invention, and FIG.
FIG. 3 is a schematic view of a main part of an embodiment of an automobile air conditioner according to the present invention, FIGS. 3A and 3B are sectional views of a radiation temperature sensor, and FIG. 4 is an example of control of the device according to the present invention. FIG. 5 is a flowchart showing another example, FIG.
FIG. 7 is a control state diagram when the heat load is high, FIG. 7 is a control state diagram when the heat load is low, and FIG. 8 is a diagram showing a conventional air conditioner. 3 ... Blower fan (adjustment means) 4 ... Evaporator 6 ... Heater core 7,9,11 ... Door (adjustment means) 8,10, 12, 32 ... Door actuator 16,17, 18, 19 ... Outlet 24 …… Outside temperature sensor 25 …… Room temperature sensor 26 …… Room temperature setting device 27 …… Insolation sensor 28 …… Controller (control means) 30 …… Radiation temperature sensor 31 …… Wind direction setting device (control means) Ta… … Outside air temperature Tic …… Room temperature Tset …… Room temperature set value S …… Insolation amount Tg …… Radiation temperature Tr …… Sensitive temperature Vfan …… Blower fan Motor applied voltage set value Tof …… Target blowing temperature X, Xv, Xf ...... Opening degree

Claims (1)

[Claims] 1. An air conditioner for an automobile, wherein air supplied to the vehicle interior is adjusted by air conditioning means to air-condition the interior of the vehicle. A radiation temperature sensor for detecting a radiation temperature is provided, and a room temperature detected by the room temperature sensor is provided. A second differential temperature detecting means for detecting a first differential temperature from a room temperature set value set by the room temperature setter is provided, and a second differential temperature detection for detecting a second differential temperature between the room temperature set value and the radiation temperature. Means is provided to control the air adjusting means based on the first differential temperature when the first differential temperature is equal to or higher than a predetermined value, and based on the second differential temperature when the first differential temperature is equal to or lower than the predetermined value. An air conditioner for an automobile, characterized by comprising control means for controlling the air adjusting means.