JPH03253418A - Automobile air conditioner - Google Patents

Abstract

PURPOSE:To improve amenity by controlling the amplitude of an air conditioner wind with a solar radiation quantity detected, and also controlling a period according to a heat load in a detection chamber. CONSTITUTION:A solar radiation quantity is detected with a solar radiation quantity detection means CL2, room temperature is detected with a room heat load detection means CL3, and each is inputted in a control means CL4. The control means CL4 controls a blower fan with a wind speed variation means CL1 based on an inputted detected solar radiation quantity to vary an air conditioning wind by given amplitude. Also the air conditioning wind is varied at a given period by detected room temperature. This constitution permits the obtaining of a suitable warm and cool feeling and temperature distribution in a normal condition to improve amenity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to an air conditioner for an automobile that controls air conditioned air in the cabin of an automobile.

(Prior Art) As a conventional automobile air conditioner, there is one that is controlled according to the flowchart shown in FIG. 7, for example.
(Refer to Japanese Patent Application Laid-open No. 1-164616).

That is, when the A/C switch is turned on, first, in step 5101, constants A to H used for subsequent processing and determination are set.
A set is made. Next, outside temperature Ta, room temperature Tic
, room temperature set value T se t % solar radiation S, etc. are read (step 5102), and room temperature Tie and room temperature set value Ts are read.
The applied voltage setting value Vf an of the proa fan motor is determined according to the difference from et (step 5103). The target blowout temperature Tof continues to be TofmAaTa+BaTi
c+C-Tset+D-5+E (A-E is a constant) (step 5104), and using this Tof, the air mix door opening degree X is calculated as X-F-Tof2+G-Tof+H (F to H are constants) Step 51
05), and further in step 5106, the target blowout temperature To
The heater, pie level, and vent outlet modes are selected depending on f.

Then, in step 5107, it is determined whether or not the outlet mode selected in step 5106 is the vent mode. If this determination is NO, the proafan applied voltage set value Vfan calculated in step 5103 is applied to the motor (step S110)
. Further, a control signal is output to the corresponding actuator to open the air outlet in accordance with each mode of the heater and pie level (step S111). Meanwhile, step 510
If the determination in step 7 is YES, step 5108 sets a pulsating wind fluctuation range, which is the difference between high air volume and low air volume, in accordance with the heat load determined from the output value of the solar radiation sensor. Next, in step 8109, the applied voltage set value Vfan obtained in step 5103 is used as a reference to calculate the value of step 51.
In addition to setting a high air volume setting value, which is the upper limit of the pulsating air flow fluctuation range set in 08, and a low air volume setting value, which is the lower limit, the proafan is set with an appropriate waveform between the high air volume setting value and the low air volume setting value. Controls the voltage applied to the motor.

At the same time, when the pulsation fluctuation width is equal to or greater than the reference value Vf an , the drive control is performed to the concentrated blowing mode, and when it is less than or equal to the reference value Vf an , the driving control is performed to the diffused blowing mode.

Therefore, when the amount of solar radiation is high, such as during the daytime in summer, by setting the pulsating wind fluctuation range to a large value, it is possible to obtain the feeling of a large amount of airflow that wipes out the heat load. Furthermore, at nighttime in the summer when there is no sunlight, the pulsating wind fluctuation range becomes smaller and the changing air volume also decreases, allowing the user to experience a gentle wind speed sensation.

(Problem to be solved by the invention) By the way, in a steady state where the air conditioning in the vehicle interior is progressing to a certain degree, thermal sensation and temperature distribution are important in order to obtain comfort from air conditioning, and air flow sensation is not so important. .

FIG. 8 is a graph of experimental results showing the degree of effect of input signals such as room temperature on the thermal sensation, air flow sensation, and temperature distribution with respect to the amplitude and period of fluctuating wind. The numbers in the chart indicate the degree of effectiveness; 2 means effective, 1 means somewhat effective, and 0 means no effect.

Therefore, as a result of looking at the above graph from the viewpoint that the temperature distribution is important in steady state, it was found that it is sufficient to control the amplitude using the solar radiation signal and the period using the room temperature signal.

However, in the conventional automobile air conditioner as described above, since the amplitude of the fan voltage fluctuation of the proa fan is primarily controlled based on the amount of solar radiation, there is a problem that comfort cannot necessarily be obtained.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an air conditioner for an automobile that can control the amplitude of fluctuating wind according to the amount of solar radiation and the cycle of the fluctuating wind according to the room temperature in the steady state of air conditioning.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes a wind speed varying means CLI that varies the conditioned air with a predetermined amplitude and period, as shown in FIG. Solar radiation amount detection means CL2 for detecting the amount of solar radiation
and indoor heat load detection means CL3 for detecting the heat load in the vehicle interior.
and a control means C that controls the amplitude of the normal wind according to the detected amount of solar radiation and controls the period according to the detected indoor heat load.
It is characterized by being equipped with L4.

(Function) The conditioned air varying means CLI varies the conditioned air with a predetermined amplitude and period. The amplitude of this fluctuating wind is determined by the solar radiation amount detection means CL2.
The control means CL4 performs control according to the detected amount of solar radiation. The period of the fluctuating wind is controlled by the control means CL4 according to the heat load detected by the indoor heat load detection means CL3. Therefore, the temperature distribution within the vehicle interior can be controlled mainly when the air conditioning is in steady state.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows a configuration diagram according to an embodiment of the present invention, and the vehicle of this embodiment is equipped with an air conditioning unit 1 in the vehicle instrument. This air conditioning unit 1 has a proa fan 3 that introduces and blows air from inside the vehicle interior or outside the vehicle interior. On the downstream side of the proafan 3, there is an evaporator 5 that introduces refrigerant from a refrigeration cycle consisting of a compressor, a condenser, an expansion valve, etc. (not shown), and cools and passes the blown air, and further introduces engine cooling water (not shown). It has a heater core 7 that heats and passes the blown air using the heat. An air mix door 9 is provided on the upstream side of the heater core 7 to adjust the temperature by adjusting the proportion of the air passing through the evaporator 5 to be introduced into the heater core 7. The structure is such that the air is blown out from 13 and automatically controls the temperature inside the vehicle.

The proafan 3 constitutes a wind speed varying means CLI that fluctuates the blowing speed of the conditioned air into a SIN waveform.

A vent door 17 that is driven to open and close by a vent door actuator 15 and a floor door 21 that is driven to open and close by one floor door actuator are provided at the base end of each air outlet 11.13. Further, the air mix door 9 is driven to open and close by an air mix door actuator 23.

An outside temperature detector 25 for detecting the outside temperature and a solar radiation amount detector 27 as a solar radiation amount detection means CL2 for detecting the amount of solar radiation are provided at appropriate positions outside the vehicle interior.

A room temperature detector 29 serving as indoor heat load detection means CL3 for detecting the heat load in the vehicle interior is provided, for example, on the ceiling of the vehicle interior.

For example, an instrument in the vehicle interior is equipped with a room temperature setting device 31 for setting the interior temperature.

The signals detected by each of the two detectors 25 and the signal set by the setting device 31 are the signals detected by the A/D converter 33.
is converted into a digital signal and inputted to the microcomputer 35 as the control means CL5, from which the blower fan 3 of the air conditioning unit 1 is sent.
And it is configured to output a drive signal to each actuator 15, 19.23.

FIGS. 3 and 4 show an example in which the air outlet is also formed at the upper edge of the door. Note that the same elements as in FIG. 2 are designated by the same reference numerals and their explanations will be omitted.

As shown in FIG. 3, a duct 43 is installed inside the door 37 and has an air outlet 41 at its upper edge. The front end of this duct 43 is connected to the tip of a differential duct 47 which is installed in the instrument 44 and is provided with a differential air outlet 45, with the door 37 closed, at section A in FIG. The base of the differential duct 47 is communicatively connected to the air conditioning unit 1 on the upstream side of the proa fan 3, as shown in FIG.

Furthermore, the differential duct 47 is connected to the air conditioning unit 1 via a bypass duct 49 on the downstream side of the air mix door 9 .

A door 51 is provided at the base of the differential duct 47 and is driven to open and close by an actuator (not shown).
The bypass duct 49 is provided with a door 53 that is driven to open and close by an actuator (not shown).

When the interior of the vehicle is in a steady state, the door 51 is closed and the door 53 of the bypass duct 49 is opened, thereby blowing out the conditioned air from the differential outlet 45 and the air outlet 41. The conditioned air blown from the differential outlet 45 and the air outlet 41 causes the windshield (not shown) to
, the door glass 55 is prevented from fogging, and the interior of the vehicle is air-conditioned.

Furthermore, when the air conditioning inside the vehicle is in a transient state, by closing the door 53 of the bypass duct 49 and closing the door 51, the air around the windshield and door glass 55 is sucked in by the proa fan 3. Then, this sucked air is transferred to the evaporator 5 of the air conditioning unit 1.
The temperature is controlled by the heater core 7, and the air is blown into the vehicle interior from the vent outlet 11 or the floor outlet 13. Therefore, when starting air conditioning, etc., hot air near the windshield and door glass 55 does not directly hit the occupant, and this hot air can be cooled preferentially, further improving comfort.

Next, the control action of the air conditioner according to this embodiment will be explained using the flowchart shown in FIG.

When the A/C switch is turned on by the key switch after getting in the car, first, in step s1, the outside temperature Ta detected by the outside temperature detector 25, the solar radiation amount S detected by the solar radiation amount detector 27, and the room temperature detector 29 are detected. Detected room temperature T
i c and the set room temperature Tset set by the room temperature setter 31 are manually input to the microcomputer 35 via the A/D converter 33 .

Next, in step S2, the set room temperature Tset and the detected room temperature T
It is determined whether the difference from ic is within ±3°C. This determination is to determine whether or not the air conditioning is in a steady state. If the difference is within ±3°C, which is a predetermined value, the air conditioning has progressed to some extent, and this state is determined to be a steady state, and the process moves to step S3, where it is determined whether the outside temperature Ta exceeds 35°C. It is determined whether If the outside temperature Ta exceeds a predetermined value of 35°C, it is determined that the outdoor load is large, and the process proceeds to step S4, where the wind speed from the air outlet 11. SIN fluctuation balloon.

For this purpose, first, the fan voltage fluctuation amplitude W of the proa fan 3 is calculated from the solar radiation amount S (step S5). The fan voltage fluctuation amplitude W calculated here is calculated in the next step S
Plus (+) for the fan average voltage F calculated in 6
The same voltage width is set on the negative (-) side and negative (-) side.

Next, the difference between the detected room temperature Tic and the room temperature set value Tset (T
The fan average voltage F of the proa fan 3 is calculated according to (i c -Ts e t) (step S6). The fan average voltage F calculated here is set to 6V if the difference between the detected room temperature Tic and the room temperature set value Tset is within the range of ±3°C, and 12V if it exceeds the range of ±3°C. Set.

Furthermore, the fan voltage fluctuation period T of the proa fan 3 is calculated from the detected room temperature Tie (step S7).

If it is determined in step S3 that the outside temperature Ta is below the predetermined value of 35° C., the process proceeds to step S8, where it is determined whether the amount of solar radiation S exceeds 300 kcai/m2h. If the amount of solar radiation S exceeds 300, the occupant tends to feel hot, so the process moves to step S4, and the fan voltage fluctuation amplitude W and the fan voltage fluctuation period T are set in steps 85 to S7 in the same manner as described above. Therefore, when there is a sudden change in the amount of solar radiation during normal conditions, it is possible to obtain a predetermined airflow feeling.

Further, in step S8, the solar radiation amount S is 300 kcai/m2.
If it is less than h, the process moves to step S9 and the air outlet 11.13
The speed of the air blowing from the pipe is constant. For this purpose, the fan applied voltage of the proa fan 3 is fixed at 6V (step 510).

Further, in step S2, when the difference between the detected room temperature Tie and the room temperature set value Tset exceeds a predetermined value of ±3°C, the air conditioning is not progressing immediately after the air conditioning unit 1 is started, and the vehicle interior is in the steady state. It is determined that this is a transient state leading to. At this time, the air blown from the air outlet 11.13 is changed to the SIN variable air flow (step 511).

For this purpose, first, the fan voltage fluctuation amplitude W of the proa fan 3 is calculated from the detected room temperature Tic (step 512).
.

Next, the fan average voltage F of the proa fan 3 is calculated according to the difference between the detected room temperature Tic and the room temperature set value Tset (
Step 513).

Furthermore, the fan voltage fluctuation period T of the proa fan 3 is calculated from the detected room temperature Tic (step $14).

Step S7. In S10 and 514, when the respective fan voltage states are determined, the process moves to step S15, and the target blowout temperature Tf is determined as Tf-A-Ta+BaTic+C・T.
It is calculated as set+D-S+E (A to E are constants).

Subsequently, in step S16, the air mix door opening degree X is calculated as X-F-Tf+G (F and G are constants) using the target blowout temperature Tf.

By controlling the air blowing from the air conditioning unit 1 as described above, when the vehicle interior is in a steady state, the amplitude of the fluctuating airflow can be controlled by the amount of solar radiation, and the cycle can be controlled by the room temperature. cold sensation distribution) can be maintained appropriately.

That is, increasing the amplitude of the SIN fluctuating wind depending on the amount of solar radiation means that the range of change in wind speed becomes larger, which means that the range of change in human skin surface temperature becomes larger. Specifically, in an environment where a large heat load such as sweating suddenly changes, the degree of sweating and evaporation that occurs on the skin surface increases, and sensible heat dissipation makes it possible to feel cool in a short time. Therefore, when a large heat load such as solar radiation suddenly changes, it is effective to control the amplitude of the SIN fluctuating wind as described above.

Furthermore, when the cycle is controlled by room temperature, there is no sudden and strong change in thermal sensation compared to solar heat load. This is because temperature affects humans through the unique mechanism of air convection, and the time it takes to affect humans is longer than that of solar radiation. Therefore, in order to match the thermal sensation and time constant with respect to temperature changes, it is optimal to control the period of the SIN fluctuating wind.

Therefore, as described above, the thermal sensation and temperature distribution become appropriate.

Furthermore, since appropriate thermal sensations and airflow sensations can be obtained during a transient state, comfort can be improved.

Note that steps 55 to S7 and steps S12 to S1
The calculation order in step 4 is arbitrary.

FIG. 6 shows a flowchart according to another embodiment. Steps similar to those in the flowchart of FIG. 5 are given the same reference numerals, and redundant explanation will be omitted.

In this embodiment, when the room temperature Tic is high in a transient state, the voltage width on the negative (-) side of the fan voltage fluctuation amplitude W with respect to the fan average voltage F is reduced to reduce the deterioration of thermal sensation at the negative (-) side amplitude. This improves comfort.

That is, the target blowout temperature Tf is calculated in step S17, and then the air mix door opening degree X is calculated in step S18.
is calculated.

Next, the fan average voltage F is calculated according to the difference between the detected room temperature Tic and the room temperature set value Tset (step 519).
.

In step S20, it is determined whether the detected room temperature Tic exceeds 45°C. If the detected room temperature Tic is below 45°C, the process moves to step S21 and the fan voltage fluctuation amplitude W is
is calculated. Fan voltage fluctuation amplitude W calculated here
is set with equal voltage width on the plus (+) side and the minus (-) side with respect to the fan average voltage F.

Furthermore, the fan voltage fluctuation period T is calculated in step S22.

Further, if the room temperature Tie exceeds 45° C. in step S20, it is determined that the room temperature is high, and the process proceeds to step 52B, where the fan voltage fluctuation amplitude W is calculated.

The fan voltage fluctuation amplitude W calculated here is controlled to be constant at 3V on the plus (+) side with respect to the fan average voltage F, and to increase as the room temperature TiC increases, and on the minus (-) side. Then, in step S22, the voltage fluctuation period T is calculated.

Therefore, in this embodiment, when the room temperature is high in a transient state, the fan voltage fluctuation amplitude W is controlled to a constant voltage width of 3 V on the negative (-) side with respect to the fan average voltage F, and the negative (-) side amplitude is By eliminating the deterioration of thermal sensation during
Comfort can be further improved.

Note that although this invention has been described with respect to air conditioning, the same effects can be achieved in heating as well.

[Effects of the Invention] As is clear from the above explanation, according to the configuration of the present invention, the amplitude of the fluctuating wind is controlled according to the amount of solar radiation, and the period is controlled according to the room temperature. and comfort is significantly improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is a perspective view showing an example in which the air outlet is formed at the upper edge of the door, and Fig. 4 is a block diagram of the present invention. 3 is a schematic sectional view, FIG. 5 is a flowchart based on the configuration of FIG. 2, FIG. 6 is a flowchart according to another embodiment of the present invention, FIG. 7 is a flowchart according to a conventional example, and FIG. It is a chart of experimental results showing input signals such as room temperature and the degree of effect on thermal sensation, air flow sensation, and temperature distribution with respect to the amplitude and period of fluctuating wind. CLI...Wind speed variation means CL2...Solar radiation detection means CL3...Indoor heat load detection means CL4...Control means

Claims (1)

[Claims] A wind speed varying means for varying the conditioned air with a predetermined amplitude and cycle; a solar radiation amount detecting means for detecting the amount of outdoor solar radiation; an indoor heat load detecting means for detecting the heat load inside the vehicle; An air conditioner for an automobile, comprising: control means for controlling the amplitude of the wind and controlling the period according to the detected indoor heat load.