JPH01164617A - Air conditioner for automobile - Google Patents

Abstract

PURPOSE:To improve comfortableness ensuring a clear feeling of blown air speed without generating a blower noise by controlling a blown air proportion of conditioned air for two or more blow outlets to be timely changed being based on a thermal load condition in a car room. CONSTITUTION:An air conditioner main unit 20 is constituted of a blower unit 21, cooling unit 22 and a heater unit 23. In this constitution, each right and left branch duct 4R, 4L respectively communicates with an end part of a ventilator duct 34 arranged in the heater unit 23, while an air distributing door 5, serving as the blown air quantity proportion control means, is pivotally supported to these communication parts. While a controller 41 respectively inputs each detection signal from an outside air temperature sensor 42, room temperature sensor 43, room temperature setter 44 and a solar radiation quantity sensor 45 which detect a thermal load condition n a car room. And controlling the air distributing door 5 being based on the thermal load condition in the car room, a proportion of blown air quantity is timely changed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air conditioner for an automobile that can provide a comfortable feeling of wind speed while minimizing discomfort caused by noise caused by variable air volume. .

2. Description of the Related Art As a conventional automobile air conditioner, one that executes control having the characteristics shown in FIG. 3 has been proposed (see Japanese Patent Laid-Open No. 140216/1983).

That is, this device controls the blower motor applied voltage V out based on the vehicle interior temperature Tr, and as the vehicle interior temperature Tr approaches the set temperature T set, the blower motor applied voltage V out is changed from large to small, and the air volume is gradually increased. decrease to Then, the vehicle interior temperature Tr and the set temperature T se
When the difference in t is within 2°C, the blower motor applied voltage V
out changes periodically based on 6(v), and the harmonic air m fed into the vehicle interior increases and decreases. This gives the passenger seated in the vehicle interior a sense of wind speed that fluctuates over time, thereby preventing the phenomenon in which the sense of comfort deteriorates over time and maintaining the sense of comfort for the passenger.

Problems to be Solved by the Invention However, with such conventional devices, changes in the amount of air blown by the blower fan give the occupants a sense of wind speed that changes over time. This inevitably involves changes in the air blowing noise and the rotation noise of the blower motor. Therefore, for the occupants, the change in air volume stimulates a comfortable sense of wind speed, and at the same time, the noise also provides unpleasant auditory stimulation. For this reason, even though a pleasant feeling of wind speed can be obtained6, this comfortable feeling of wind speed is spoiled by unpleasant auditory stimulation, and it is not necessarily possible to improve the comfort of the interior environment of the vehicle. There wasn't.

Means for Solving the Problems The present invention has been made in view of the above-mentioned problems of the prior art. The air conditioner is provided with air flow rate control means for temporally changing the proportion of the harmonized air blown to each of the outlets based on the heat load conditions in the vehicle interior.

Effect In the above configuration, when the air blowing m ratio control means is activated based on the heat load condition in the vehicle interior, the proportion of the harmonic air blowing amount to each outlet changes, so even if the change in the air supply amount is minute, The amount of air blown from each outlet increases or decreases relatively. Therefore, the occupants get a sense of wind speed due to changes in the harmonic air from each outlet, which increases or decreases relatively significantly, without being accompanied by air blowing noise caused by an increase in the amount of air supplied. Specifically, after reaching a steady state, the air volume is pulsated and switched between concentration and diffusion, and the air volume on the left and right sides is increased or decreased in accordance with this concentration or diffusion, increasing the interval between increases and decreases in the air volume.

Example An embodiment of the present invention will be described below with reference to the drawings.

That is, as shown in FIG. 2, the air conditioner main body 20 is constructed by connecting a lower unit 21, a cooling unit 22, and a heater unit 23. The proar unit 21 is provided with an intake door 26 that opens and closes the outside air inlet 24 and the internal inlet 25, and a proafan 28 as a Suita variable means whose drive source is a proafan motor 27. The intake door actuator 29 is linked.

An evaporator 30 is installed in the cooling unit 22, and a heater core 31 that uses engine cooling water as a heat source is installed in the heater unit 23. On the front side of the heater core 31, an air mix door actuator 32 is connected. An air mix door 33 is pivotally installed. Further, the heater unit 23 is formed with a ventilator duct 34, a defrost duct 35, and a foot air duct 36. At the base end of each duct 34, 35, 36, a vent door 38 linked to a vent door actuator 37 is formed. , and a defrock/foothold switching door 40 linked to a differential/foothold switching door actuator 39. The ventilator duct 3
4 is disposed in the instrument panel 3 horizontally installed in front of the passengers (not shown) seated on the right front seat l and the left front seat 2, and the end of the ventilator duct 34 has a right branch duct 4R and a left branch duct 4R. A branch duct 4L is communicated with the left and right branch ducts 4R, 4L, and an air distribution door 5 serving as an air flow ratio control means is pivotally supported at a communication portion between the left and right branch ducts 4R and 4L. The ventilation door 5 is linked to a ventilation door actuator 6, and has a neutral position M where the air blowing ratio of the left and right branch ducts 4R and 4L is approximately equal, and a neutral position M where the air blowing ratio of the left branch duct 4L side increases and the right branch duct l.
A right R position where the air blowing ratio on the -4rt side is relatively reduced;
On the contrary, it is rotatably supported at a leftward position where the air blowing rate on the right branch duct 4R side increases and the air blowing rate on the left branch duct 4L side relatively decreases. The right branch duct 4R includes a pair of right ventilator ducts 7R, which are opened at a portion of the instrument panel 3 facing the right front seat l.
A pair of left ventilator ducts 7L, 7L opened at a portion facing the left front seat 2 are communicated with the left branch duct 4L. Each ventilator duct 7L, 7R is pivotally supported by a plurality of loopers 9 linked to the blowout lower actuator 8. , and a diffusion mode in which the air is blown out over a wide range within the vehicle compartment IO.

On the other hand, the input section of the controller 41 includes an outside temperature sensor 42 that detects the heat load conditions inside the small room 10, a room temperature sensor 43,
Detection signals from the room temperature setting device 44 and the solar radiation sensor 45 are inputted, and from the output section of the controller 41, the respective actuators 6.8, 29, 32,
37, 39 and the proafan motor 27.

Next, the operation of this embodiment according to the above configuration will be explained according to the flowchart shown in FIG.

That is, when an air conditioning switch (not shown) is turned on, the controller 41 is started together with the air conditioning device main body 20, and constants A to ■] used for subsequent process determination are set (
Step 101). Next, the outside temperature Ta, room temperature Tic, room temperature set value Tset, solar radiation amount S, etc. are read from each sensor 42, 43, 45 and room temperature setter 44 (step 10
2), difference Tic-T between room temperature TiC and room temperature set value Tset
The applied voltage setting value Vfan of the pro fan motor 27 is determined according to the set (step 103). Subsequently, the target blowout temperature Tof is determined as TOf=A-Ta+B-Ti
It is calculated as C+C・Tset+D−S+E (A−E=constant) (step 104), and using this Tof,
=F −Tof” 10G−Tof+H (F−H=constant)
The air emitter store opening degree X is calculated as (Step 1
05), and in the next step 106, the target blowing temperature T
Depending on of, the following heater, pie level, and vent outlet modes are selected.

Heater mode: Open the foot air duct 36 and defroster duct 35.

Pie level mode: Open the ventilator duct 34 and foot air duct 36.

Vent mode: Only the ventilator duct 34 is opened.

Then, in the next step 107, it is determined whether or not the outlet mode selected in the previous step is the vent mode, and if this determination is NO, the pro-fan applied voltage setting value Vran calculated in the previous step is A control signal is applied to the proafan motor 27 (step 110), and a control signal is output to the corresponding actuator 37, 39 to open the blow-off duct according to each mode of heater and pie level. On the other hand, if the determination in step 107 is YES, the difference Tic between the room temperature Tie and the room temperature set value T set
It is determined whether -Tset is smaller than a predetermined value of 2°C. This discrimination is NOl, that is, T ic −T; se
If t is greater than 2°C, the temperature in the vehicle interior has not reached a temperature close to the desired room temperature set value T set set by the occupant, and therefore steps zo and zt are performed as in the normal cool-down time. processing is performed.

On the other hand, if the determination in step 108 is YES and the temperature in the vehicle interior drops to within 2°C of the room temperature set value T set,
The process of step 109 is performed. In step 109, pulsating wind control is performed to periodically change the voltage applied to the proa fan motor 27, blowout mode control is performed to change the looper 9 between the concentrated blowout mode and the diffused blowout mode, and the blowout door 5 is driven. Air flow rate control is performed synchronously. In the pulsating airflow control, the voltage applied to the proafan motor 27 is changed over time (with an average voltage of 6V) between 4■, which corresponds to a low airflow volume, and 8■, which corresponds to a medium airflow volume.
In this embodiment, one cycle is changed for 30 seconds. In synchronization with this, in the blowing mode control, a diffuse blowing mode is executed corresponding to the low air volume of the pulsating air control, and a concentrated blowing mode is executed when the air volume is medium. Therefore, the harmonized wind that is blown out over a wide area when the air volume is low is now directed toward the occupants in a concentrated manner when the air volume is medium.

Further, in synchronization with this, in the air volume ratio control, the air distribution door 5 is driven to the neutral M position in the diffused air blowing mode through the air air distribution door actuator 6, and is driven to the right R position and to the left in the concentrated air blowing mode. position and position for 5 seconds each. Therefore, when the ventilation door 5 is driven to the left position, the ratio of ventilation on the right branch duct 4R side increases relatively, and a large amount of harmonized air with high wind speed is supplied from the right ventilator outlet. Ru. Therefore, the passenger sitting in the right front seat 1 can obtain a clear sense of wind speed due to the increased air blow rate and the harmonized wind blown toward the passenger in the concentrated blow mode.

Therefore, in the pulsating wind control, if the voltage applied to the proa fan motor 27 is not changed to 12V, which is the value for large air volume, but is changed to 8V, which is the value for medium air volume, it will be equivalent to the value for large kite m, or It is possible to obtain a feeling of a wind speed higher than that, and therefore, it is possible to minimize the blowing noise caused by the increase in the supplied air m.

Of course, the same applies when the ventilation door 5 is driven to the right R position. You can feel the wind speed faster than usual. Therefore, front seat 1.
For the occupants seated in No. 2, the discomfort caused by the increase in air blowing noise can be minimized, and comfort can be improved by experiencing only the above-mentioned comfortable feeling of wind speed.

Furthermore, regarding the present invention, the following examples can be given.

(1) In the above embodiment, in step 109, pulsating air control, blowing mode control, and blowing rate ratio control are performed, but only the blowing rate ratio control, pulsating wind control, blowing rate ratio control, or blowing It may be a combination of mode control and air flow rate control.

(2) In the above embodiment, step 109 was set to switch between the concentrated blow mode and the diffused Suita mode based on the average voltage of 6V, but if there is a more appropriate value,
It is also possible to use it to perform switching in accordance with the fluctuating voltage of pulsating wind control.

(3) In the embodiment described above, the voltage applied to the pro-fan motor 27 was changed according to a sine curve as shown in step 109, but it is also possible to change the applied voltage with an appropriate waveform. You can.

(4) Proafan motor 2 calculated in step 103
If the stability of the blowing air is too deteriorated due to the difference between the applied voltage set value Vfan in step 7 and the average voltage set in step 109, the average voltage is made to match the applied voltage set value Vfan, Alternatively, by placing them close to each other, the blowing air can be made appropriately stable.

(5) If the average voltage cannot be brought close enough to the applied voltage set value V fan, the stability of the vehicle interior temperature can be ensured by controlling the air mix door 33 that adjusts the blowout temperature.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides a structure for supplying harmonized air into a vehicle interior through a plurality of air outlets provided in front of a passenger door for seating in the vehicle interior, in which the heat in the vehicle interior is reduced. Based on the load conditions, the proportion of harmonic air blown to each outlet is changed over time. Therefore, even if the change in the amount of air supplied is small, the amount of air blown from each outlet increases or decreases relatively largely due to the change in the proportion m of harmonic air sent to each outlet. Therefore, the occupant can obtain a clear sense of wind speed due to changes in the harmonic wind from each outlet, which relatively increases or decreases significantly, without hearing the air blowing noise caused by the increase in the amount of air supplied. Therefore, the occupants are not subjected to unpleasant auditory stimulation due to air blowing noise, and can obtain only an amount of air blowing that is pleasant to the body, thereby making it possible to improve comfort.

[Brief explanation of the drawing]

FIG. 1 is a flowchart showing one embodiment of the present invention, and FIG.
The figure is an overall conceptual diagram of the same embodiment, and FIG. 3 is a control characteristic diagram of a conventional automobile air conditioner. l...Right front seat, 2...Left front seat, IO...
Storage room, 6...Ventil distribution door (airflow rate control means), 7R
...Right ventilator outlet, 7L...Left ventilator outlet. 2 people outside

Claims (1)

[Claims] (1) In an air conditioner that supplies conditioned air into a vehicle interior through a plurality of outlets provided in front of a passenger seated in the vehicle interior, each of the air conditioners is An air conditioner for an automobile, characterized in that an air conditioner is provided with an air flow ratio control means that temporally changes the air flow ratio of the harmonized air to the outlet.