JPS5861014A - Vehicular air conditioner - Google Patents

Abstract

PURPOSE:To eliminate mild blur and obtain defrosting operation in such a way that in a structure that in selection of DEF mode, hot draft is blown out by turning a blower fan at high speed, when outer air temperature is at more than the determined value, turning speed of said fan is decreased. CONSTITUTION:A draft rate arithmetic unit 15 is provided which computes draft rate set point in compliance with the determined draft rate characteristics on the basis of outer air signals from a draft rate arithmetic unit 10 to compute draft rate by temperature difference between temperature in the vehicular cabin and the determined temperature Ts. When a DEF mode selection switch 13 is turned on, and a relay 17 is selecting on the side of said unit 15, in case where outer air temperature is at less than T1 (approximately -10 deg.C), arithmetic unit 15 controls a fan driving device 18 so that it can be set to the speed of a blower fan 4 at high speed. Besides, it is constituted so as to control said device 18 in such a way that while the outer air temperature is between T1 and T2, draft rate is to be gradually decreased along with the rise in the outer temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle air conditioner that properly controls air flow in the DEF mode of air conditioning operation so as not to cause discomfort to occupants.

Is there a temperature inside the car in modern vehicles? In addition to cooling and heating the interior of a single room, the air conditioner also blows out warm air when the front window or side window becomes cloudy or has a shrine attached to it. Roasting is also used to quickly remove frost. Figure 1 shows the schematic configuration of a conventional air conditioner, window measurements, and
An example of a control circuit (hereinafter referred to as rDEF mode) is shown. In the figure, an intake door opens and closes the outside air inlet 2 or the inside air inlet 3 to take in outside air or inside air, 4 is a proa fan installed in the air introduction path, and 5 is a proa fan 4 that cools the air sent. An evaporator that dehumidifies, a heater core that heats the entire air that has been cooled and dehumidified by the evaporator 5, and a heater core 7 that closes the inlet to the heater 6 during cooling and opens an inlet to the heater core 6 during heating. The air mix door is driven by a negative pressure actuator 8, and the heating rate is determined according to the opening degree. The cooling air heated by the heater core 6 is then mixed with the cold air sent directly from the evaporator 5, and is blown out from the air outlet into the vehicle interior 9 through an outlet switching device (not shown) provided downstream of the heater core 6. I can do it.

lO is an air volume calculation device that determines the blowout air volume based on cleaning the room temperature, set temperature, etc.;
power transistor, 12i, tRelay for fixing the air volume of the blower fan 4 to Hi (lligh) level, 1
3 is a sweetener for D1 mode training.

In the above air conditioner, I-) EI-mode operation is completely easy, and the windshield and frost are removed as quickly as possible.
! In order to move away, simply press the I) E P mode selection switch to switch to the blowout mode > I) E F mode and set the pro fan speed to full speed.
At the same time as the F mode selection switch is operated, a large amount of wind is blown out, and even a frozen window can be quickly defrosted when the outside temperature JW is as low as -10 DEG C. or lower, for example. However, if such high N- wind blows out when the outside air temperature is not very low, say θ to 15°C, it may hit the occupants' faces and heads, causing discomfort. Yes, when the noise of the pro-a fan gets louder, M+"■ will occur. 11E li" mode operation requires extreme gravitas to ensure visibility, so in this case, other modes Il' It is impossible to avoid the unpleasant feeling and noise.

In view of the above points in the present invention, r1 has been added to n5,
Claim Il 1411' When the mode 1 selection switch is turned on, a balloon "1 mode < I) 1J F
When the air is turned on and the proa fan rotation speed is set to Uk and high speed 1, and the air is blown out, in the cooling device N, a relatively high-temperature wind blows out into the ET bottle and hits the board. Discomfort due to -h: (I!- To reduce it, when the outside temperature is below a predetermined value, the plane rotation speed is set to 1,9'4/high speed, and when it is above the predetermined value, it is set to a value of 0 shij, ta 1 stride. According to the above-mentioned high speed, a predetermined value of r-Variance IW lower than 116 is set.

The present invention will be explained below with reference to the drawings.

FIG. 2 shows the main parts of an embodiment of the air conditioner according to the present invention.])16. This is an example in which wind wire control is performed in Suita ~ 3. A sensor, 15 is a wind fA' calculation device whose blowing air quality changes as shown in FIG. 3 depending on the outside temperature, 17 is a relay and a DEF mode selection switch 13
The air volume calculation device 10 straddle 15 is selected depending on whether it is on or off. Reference numeral 18 denotes a fan drive device including a power transistor or the like, which drives the motor of the pro fan 4.

Now, in the above-mentioned example, the air volume calculation device [10] calculates the air volume based on the temperature difference between the vehicle interior temperature Ti and the set temperature Ts, as shown in FIG.

On the other hand, the airflow calculation device 15 calculates the air quality target value according to the airflow characteristics shown in FIG. 3 based on the outside air signal from the outside temperature sensor 14. In other words, the outside temperature is T, (approximately -1
When the outside temperature is below 0℃, the blower fan speed is fixed at the same speed, and when the outside temperature is between T and T, (approximately 5℃ to 15℃)]
The air volume has a characteristic that from L (High) to L (Low), the air volume gradually decreases as the outside temperature increases. When the D101 mode selection switch 13 is on, the
The relay 17 is driven to select the neck attachment 15. J)
E Ii' When the mode selection switch isoner 13 is off, the relay 17 is turned off and the normal air volume is selected regardless of whether the air volume calculation device 15 outputs the signal from the air volume calculation device 15.

Therefore, I) 13 When F mode selection switcher 13 is turned on, fan fi<! The air volume No. 18 sent to Ti#Ti changes depending on the temperature, as shown by the #: line in FIG. A, [, J T(
-) 1! @.

The amount level is determined by the wind-1 characteristic in Figure 4.
It's Rubel.

As explained above, in VC1 according to the present invention, t, ↓, 1)
When the EF' mode selection switch is turned on, the air conditioner blows out warm air at a high rotational speed of π-proan-an. Speech bubble)! Since the fc operation is set to 1 when the outside temperature is all above the specified outside temperature and lower than the previous high speed value, when the outside temperature is low, the air is blown at the maximum air volume as before, and when the outside air is not as high. If it is not low, the blowout air volume will be a little less, and in DEF mode, a large amount of hot air will not hit the occupant's face or head and make them uncomfortable, and since the noise of the blower 7 Ann is not so loud, it can be used for gentle defogging or Defrosting operation is not working properly0

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional air conditioner and a near-mix door control circuit, Fig. 2 is a main part of an air volume control circuit of another embodiment of the air conditioner according to the present invention, and Figs. 3 and 4. is the second
FIG. 5 is a characteristic diagram of one calculation unit of the air volume control circuit shown in the figure, and FIG. 5 is a composite characteristic diagram of the air volume control circuit of the embodiment shown in FIG. l...Intake door, 2...Outside air introduction port. 3... Internal air inlet, 4... Proa fan, 5...
Evaporator, 6... Heater core, 7... Air mix door, 8... Negative pressure actuator, 9... Vehicle interior, 10.15... K-shu performance device, 11... Fan mortar drive Power transistor, 12...relay,
13...DE li'' mode j' selection switch,
14...Outside temperature sensor, 17...Relay, 18...
・Fan drive device patent applicant Hiroshi Suzuki, 57, Patent attorney representing Nissan Autotun Co., Ltd.

Claims (1)

[Claims] In a device that blows hot air by setting the blowout low mode to 6DBF mode and setting the rotation speed of the proa fan to a high value when the DEF mode selection switch is activated, when the outside temperature is below a predetermined value, the proa fan rotates. Proa fan rotation speed control means is provided to set the speed to the high speed value and to set the rotation speed of the proa fan to a predetermined speed lower than the high speed value in accordance with the outside temperature when the outside temperature is above a predetermined value. A vehicle air conditioner characterized by: