JPH0761766B2 - Automotive air conditioner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for a vehicle that makes it possible to obtain a more comfortable feeling of wind speed without increasing blowing noise.

2. Description of the Related Art As a conventional air conditioner for automobiles, a device for performing control having the characteristics shown in FIG. 7 has been proposed (JP-A-57-57).
(See Japanese Patent No. 140216). In other words, this device
The blower motor applied voltage Vout is controlled based on Tr, and the blower motor applied voltage Vout is changed from large to small as the vehicle compartment temperature Tr approaches the set temperature Tset, and the air volume is gradually reduced. Then, when the difference between the vehicle interior temperature Tr and the set temperature Tset is within 2 ° C., the blower motor applied voltage Vout periodically fluctuates with reference to 6 (V), and the conditioned air volume fed into the vehicle interior increases or decreases. As a result, the occupant sitting in the passenger compartment is provided with a temporal change in the feeling of wind speed to prevent the comfort feeling from deteriorating with time, and to maintain the passenger's comfort feeling.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a conventional device, the wind speed is given to the occupant only by the increase in the blown air amount accompanying the increase in the rotation of the blower fan. As described above, the wind speed at the front of the occupant always has a relationship with the voltage applied to the blower fan. Therefore, when the wind speed increases, the rotation noise of the blower motor and the fan also increases along with the high speed rotation of the blower fan, so that the increase in wind speed stimulates a comfortable feeling of wind speed for the occupants. The noise also causes an unpleasant auditory stimulus. For this reason, although a comfortable wind speed feeling is obtained, the comfortable wind speed feeling is impaired by an unpleasant auditory stimulus, and it is not always possible to improve the comfort of the vehicle interior environment.

Means for Solving Problems The heat load detecting means for detecting the heat load in the passenger compartment, the room temperature setting means for setting the room temperature, the temperature adjusting means for adjusting the temperature of the conditioned air supplied to the passenger compartment, and the air conditioner. The temperature of the conditioned wind is controlled by signals from the blower means for controlling the amount of blown air over time, the blowing variable means for adjusting the blowing state of the conditioned wind supplied to the vehicle interior, the heat load detection means and the room temperature setting means. ,Air flow,
In an automobile air conditioner provided with a control means for controlling a blowout state, the blowout varying means is configured to be switchable between a concentrated blowout directed to an occupant and a diffused blowout diffused into a vehicle compartment, and a blown air amount of a predetermined amount or more. Is provided, and when the air volume increases by a predetermined amount or more in response to a signal from the detection means, the control means controls the blowout varying means to a concentrated blowout.

Action In the above configuration, the blower unit increases or decreases the blown amount of the harmonious air fed into the vehicle compartment through the air outlet over time, whereby the occupant seated in the vehicle cabin gives a temporal variation in the sense of wind speed. To be At this time, when the amount of air blown by the air blower exceeds a predetermined level, the blowout variable means is drive-controlled from diffuse blowout to concentrated blowout, so that the harmonious wind blown out over a wide area in the vehicle compartment is directed toward the occupant and concentratedly supplied. Will be sent.
Therefore, even if the air blower changes the air volume to a smaller extent, the occupant can obtain a large change in the wind speed sensation due to the concentrated wind that is fed in a concentrated manner. It is not necessary to make a high air volume with a large amount of noise, and the blowing noise can be minimized while obtaining a sufficient sense of wind speed.

Embodiment 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 body 20 includes a blower unit 21, a cooling unit 22, and a heater unit.
It is configured by connecting 23. The blower unit 21 is provided with an intake door 26 that opens and closes the outside air inlet 24 and the inside inlet 25, and a blower fan 28 that is a blower using the blower fan motor 27 as a drive source. , 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. An air mix door actuator is provided in front of the heater core 31.
Air mix door as temperature control means linked to 32
33 are pivotally installed. Further, the heater unit 23 includes a ventilator outlet 34, a defroster outlet 35, and a foot outlet.
36 is formed, and at the base end of each outlet 34, 35, 36,
Bent door linked to the vent door actuator 37
A defroster / foot switching door 40 and a defroster / foot switching door 40 linked to the actuator 39 are pivotally supported. The ventilator outlet 34 is a front seat
A plurality of instrument panels 3 are formed on the instrument panel 3 disposed in front of an occupant (not shown) seated at 1, 2, and inside the ventilator outlet 34, a wind direction setting device as a blowout varying means as shown in FIG. 4 are provided. The wind direction setting device 4
Is provided with a plurality of horizontally movable louvers 5 located in the ventilator outlet 34, and the louvers 5 are linked to each other by upper and lower links 6 and 7. A guide pin 8 is provided on the lower link 7 in a protruding manner, and an end portion of the guide pin 8 is loosely inserted in a curved guide groove 10 formed on the surface of the roller 9. The roller 9 is rotatably supported by shafts 11 and 12 projecting from both ends, and a gear 13 fixed to one shaft 12 has a gear 15 fixed to a rotary shaft of a drive motor 14. It is meshed. And this wind direction setting device 4 is the drive motor
By rotating the roller 9 via 14, the guide pin 8 in the guide groove 10 is moved left and right, whereby the louver 5 ... Orients the occupants seated on the seats 1 and 2, and the concentrated blowing mode, The louvers 5 are constructed so as to obtain a diffusion blowout mode in which the louvers 5 are directed over a wide range in the vehicle compartment.

On the other hand, the input part of the controller 41, which is a control device, has an outside air temperature sensor (heat load detection means) 42, a room temperature sensor (heat load detection means) 43, a room temperature setting device (room temperature setting means) 44, and a solar radiation sensor (heat load detection means). Means) 45 and the ventilator outlet 34, the detection signal of the outlet temperature sensor 46 for detecting the outlet temperature is inputted, and the output part of the controller 41 outputs the actuators 29, 32, 37. , 39, the blower fan motor 27, and the wind direction setting device 4 are configured to output control signals.

Next, the operation of the present embodiment having the above configuration will be described with reference to the flowchart shown in FIG. That is, when an air-conditioning switch (not shown) is turned on, the controller 41 is activated together with the air-conditioning apparatus main body 20, and constants A to H used for subsequent process discrimination are set (step 101). Next, the outside temperature Ta, the room temperature Tic, the room temperature setter Tset, the amount of solar radiation S, etc. are read from the sensors 42, 43, 45 and the room temperature setter 44 (step 102), and the difference Tic between the room temperature Tic and the room temperature set value Tset is read. −Tset
The applied voltage setting value Vfan of the blower fan motor 27 is determined in accordance with (step 103). Continue to the target outlet temperature T
of is Tof = A ・ Ta + B ・ Tic + C ・ Tset + D ・ S + E
(A to E = constant) is calculated (step 104), and using this Tof ', X = F · Tof ² + G · Tof + H (F to H =
The air mix door opening X is calculated as a constant) (step 105), and in the next step 106, the target blowout temperature To
The motor, bilevel, and vent outlet modes shown below are selected according to f.

Heater mode: The foot outlet 36 and the defroster outlet 35 are opened.

Bi-level mode: Open the ventilator outlet 34 and the foot outlet.

Vent mode: Only the ventilator outlet 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 blower fan applied voltage set value Vfan calculated in the previous step is A control signal is applied to the blower motor 27 (step 110), and a control signal is output to the corresponding actuators 37 and 39 for opening the air outlet corresponding to the heater and bilevel modes.

On the other hand, if the determination in step 107 is YES, it is determined whether or not the difference Tic-Tset between the room temperature Tic and the room temperature set value Tset is smaller than 2 ° C. If this determination is NO, that is, if Tic-Tset is higher than 2 ° C, the temperature inside the passenger compartment has not reached the temperature close to the desired room temperature set value Tset set by the occupant. Similarly, step 11
The processing of 0,111 is performed.

On the other hand, if the determination in step 108 is YES and the temperature inside the vehicle compartment falls within the room temperature set value Tset and 2 ° C, step 10
In step 109, the pulsating wind control for periodically changing the blower fan applied voltage and the concentration / diffusion control for changing the wind direction setting device 4 between the concentrated blowout mode and the diffused blowout mode are performed. Be seen. In the pulsating wind control, the applied voltage of the blower fan motor 27 is temporally changed (4 cycles corresponding to the low air volume L to 8 V corresponding to the medium air volume M (in this embodiment, one cycle is about 30 seconds)). At the same time, 6.5 V is set at the changeover point C between the medium air volume M and the low air volume L.
And In synchronization with this, in the concentration / diffusion control, the diffusion blowout mode is executed corresponding to the low air volume L of the pulsating wind control, and the setting switching point C becomes 6.5V.
When the amount of reverse air flow at the time of the applied voltage is set to a predetermined value, the concentrated blow-out mode is executed when the amount of the medium air at the applied voltage is M or more. Therefore, the harmonious wind that has been blown out over a wide range when the air volume L is low is intensively fed toward the occupant when the air volume M is medium. Therefore, the blower fan 28 is driven from a low air volume L (applied voltage 4 to 6.5 V) to a medium air volume M (applied voltage 6.5 to 8 V).
Only by changing to V), the occupant can experience a large change in wind speed sensation due to the harmonious wind that is fed intensively, and this fact is due to the experiment conducted by the inventor shown in FIG. The results also became objectively clear.

That is, in FIG. 4, the dotted line shows the blower fan applied voltage and the occupant front wind speed in the conventional example, the solid line shows the blower fan applied voltage and the occupant front wind speed in the present embodiment, and in this embodiment, the blower fan applied voltage 10.5. The diffusion blow mode was switched to the concentrated blow mode in the vicinity of V, and the maximum voltage value of the present embodiment was set at around the applied voltage of 10.5 V between the brackets. As a result, it was confirmed that this embodiment can reduce the voltage decrease amount of 1.5V with respect to the maximum blower fan applied voltage of 12V of the conventional example in order to obtain the occupant front face wind speed substantially similar to that of the conventional example. Therefore, the rotational noise of the blower fan motor 27 and the blown wind noise of the blower fan 28 are reduced by the number of revolutions corresponding to this voltage decrease of 1.5 V, and the noise associated with the increase in air volume is minimized while obtaining the required wind speed feeling. Can be done.

When the blower fan 28 changes from the medium air volume M to the low air volume L without being fixed in the concentrated air blow mode, the wind direction setter 4 changes to the diffuse air blow mode. It is possible to supply a substantially uniform harmonious wind to the entire upper body. Therefore, the difference in the feeling of wind speed between the diffused blowing mode and the concentrated blowing mode becomes clearer, and as shown by the wind speed difference ΔS in FIG. 4, the louver 5 ... As a result, it is even possible to increase the wind speed.

In addition, regarding the present embodiment, the following modes can be considered.

(1) In this embodiment, as shown in step 109, the blower fan applied voltage is changed like a sine curve between 8 V and 4 V in pulsating wind control, but the applied voltage is changed with an appropriate waveform. Alternatively, the configuration may be made.

(2) In the above embodiment, 6.5 V is set as the setting switching point C for the medium air volume M and the low air volume L. However, the setting switching point C is not limited to this, and it depends on the fluctuating voltage capable of forming pulsating wind. It is possible to use an appropriate value.

(3) When the blower fan stability is deteriorated too much due to the difference between the blower fan applied voltage setting value Vfan calculated in step 103 and the average value of the applied voltage when performing pulsating wind control calculated in step 109 In addition, the blown air can be made to have appropriate stability by matching the average value with Vfan or bringing them close to each other.

(4) If the average value cannot be sufficiently close to Vfan,
By controlling the air mix door 33 for adjusting the blowout temperature, it is possible to ensure the stability of the vehicle interior temperature.

(5) When the blower fan 28 is intermittently set to the medium air volume M, the vehicle interior becomes excessively cooled, and the room temperature Tic becomes the room temperature set value Tse.
If it becomes lower than t, it is possible to prevent overcooling by appropriately controlling the air mix door 33 to raise the temperature of the blown air.

FIG. 5 is a flow chart showing a second embodiment of the present invention, in which steps 301 to 308 and steps 310 and 311 are the same as those in the first embodiment.
The same processing and discrimination as in the embodiment are performed. However, in step 309 corresponding to step 109 of the first embodiment,
When the wind direction setting device 4 is changed to the diffusion blowing mode and the concentrated blowing mode, the rising and falling edges are made oblique, and the changing speed is slow.

According to this embodiment, since a high-speed device is not required as an actuator for driving the louver 5 of the wind direction setting device 4, the wind direction setting device 4 as the blowing variable means can be realized at low cost. Moreover, since the diffusion blowout mode changes to the concentrated blowout mode or the concentrated blowout mode changes to the diffusion blowout mode at a slow speed, a rapid change in the wind speed when changing the blowout mode is prevented. Therefore, the change in the wind speed feeling of the occupant becomes slow, and it is possible to prevent the discomfort caused by the rapid change in the wind speed feeling.

FIG. 6 is a flow chart showing a third embodiment of the present invention, in which steps 401 to 408 and steps 410 and 411 are the same as those in the first embodiment.
The same processing and determination as in the embodiment are performed, but different processing is performed in step 409 corresponding to step 109 in the first embodiment. That is, at step 409, the time differential value of the blower fan applied voltage shown by the solid line and the blower fan applied voltage shown by the dotted line is calculated, and the blower fan applied voltage determination line L ₁ and the time differential value determination are performed for both. Lines L ₂ and are set. And with the blower fan applied voltage determination line L ₁ as a reference to determine whether the blower fan applied voltage is a predetermined value or more,
By determining the magnitude of the time differential value of the blower fan applied voltage with reference to the time differential value determination line, it is determined whether or not the blower fan applied voltage is rapidly increasing. If the blower fan applied voltage is greater than or equal to the specified value (L ₁ ) and increases rapidly above the specified value (L ₂ ) based on the results of these two determinations, the wind direction setting device is rapidly activated to spread. Switch from the blowing mode to the concentrated blowing mode. on the other hand,
If the voltage applied to the blower fan is less than the specified value (L ₁ ),
And, even if it is not less than the predetermined value (L ₁ ), if the change is not abruptly more than the predetermined value (L ₂ ), the wind direction setting device 4 is operated at a low speed to switch the blowout modes.

According to the third embodiment, only when the change in the blower fan applied voltage rises sharply and the actual air volume from the blower fan motor 27 cannot follow this, the diffusion blowout mode is switched to the concentrated blowout mode. Can be done rapidly. Therefore, it is possible to compensate for the time delay of the change in the air flow rate by the rapid switching from the diffusion blowout mode to the concentrated blowout mode. On the other hand, when the blower fan applied voltage is low and the air volume is small, even if the actual air volume change of the blower fan is behind the set value, there is no large air volume change to the passengers,
Further, since there is almost no time delay between the set voltage and the actual voltage, there is no trouble in the sensation even if the blowing mode is switched at a low speed. Therefore, when such a hindrance does not occur, it is possible to extend the life of the actuator of the wind direction setting device 4, that is, the drive motor 14 by operating the wind direction setting device 4 at a low speed. Of.

EFFECTS OF THE INVENTION As described above, according to the present invention, when the air blowing amount of the air blowing unit that increases / decreases the air blowing amount exceeds a predetermined value, the blowout varying unit is controlled to the concentrated blowout. Therefore, even if the air blower changes the air volume to a smaller extent, the occupant can obtain a large change in the wind speed sensation due to the conditioned wind that is fed in a concentrated manner. Therefore, the air blower can obtain the required wind speed sensation. It is not necessary to provide a large amount of air with a large amount of noise, and a sufficient sense of wind speed can be obtained, while the blast noise can be minimized, and comfort can be improved.

In addition, in the second embodiment, since the changing speed of the wind direction setting device is made slow, a high speed device is not required as an actuator for driving the wind direction setting device, and the cost can be reduced. Further, in the fourth embodiment, the wind direction setting device is driven at high speed only under the predetermined conditions, and is driven at low speed in other cases, so that the life of the wind direction setting device is extended. It also makes it possible.

[Brief description of drawings]

FIG. 1 is a flow chart showing a first embodiment of the present invention, FIG. 2 is an overall conceptual view of the same embodiment, FIG. 3 is a front view showing a wind direction setting device of the same embodiment, and FIG. Explanatory drawing showing experimental results of an example, FIGS. 5 and 6 are flow charts showing second and third embodiments of the present invention, FIG. 7 is a control characteristic view of a conventional automobile air conditioner, and FIG. 8 is the same. FIG. 4 is an explanatory diagram showing the relationship between the blower fan applied voltage and the wind speed at the front of the passenger. 4 ... wind direction setting device (blow-out varying means), 28 ... blower fan (blowing means), 33 ... air mix door (temperature adjusting means), 41 ... controller (control device), 42 ... outside air temperature sensor ( Heat load detection means), 43 ... Room temperature sensor (heat load detection means), 44 ... Room temperature setting device (room temperature setting means), 45 ...
… Solar radiation sensor (heat load detection means).

Claims (1)

[Claims] 1. A heat load detecting means for detecting a heat load in a passenger compartment, a room temperature setting means for setting a room temperature, a temperature adjusting means for adjusting a temperature of an conditioned air supplied to the passenger compartment, and an air flow rate of the conditioned air. Of the conditioned wind, the volume of the conditioned air, and the blast of the conditioned air by means of signals from the heat load detection means and the room temperature setting means. In an automobile air conditioner having a control means for controlling the state, the blowout varying means is configured to be switchable between a concentrated blowout that directs the occupant and a diffused blowout that diffuses into the passenger compartment, and a blown air amount of a predetermined amount or more. An automotive air conditioner, characterized in that means for detecting an increase is provided, and when the air volume increases by a predetermined amount or more in response to a signal from the detection means, the control means controls the blowout varying means to a concentrated blowout.