JPH0572283B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle air conditioner, and in particular,
This invention relates to a vehicle air conditioner that can suppress blower noise when in DEF mode.

[Conventional technology]

Generally, a vehicle air conditioner is installed to air condition the interior of a vehicle.

FIG. 4 shows a vehicle air conditioner according to the prior art.

In the figure, 1 is a ventilation duct, and the ventilation duct 1 has a cavity 2 and an air intake part 3 located upstream of the cavity 2 and provided perpendicular to the cavity 2. ,
An air blowing section 4 is located downstream of the cavity 2, and a blower 5 is disposed between the air intake section 3 and the cavity 2. Therefore, when the blower 5 is driven to rotate, air is taken in from the air intake section 3, passed through the cavity 2, and then blown out from the air blowout section 4.

An outside air intake port 6 and an inside air intake port 7 are formed in the air intake section 3, and the rotation of the switching door 8 allows outside air or inside air to be taken in. Further, the air blowing section 4 includes a face blowing port 9 that opens upward, a defrost blowing port 10 that opens toward the window, and a foot blowing port 11 that opens downward.
By rotating the mode switching door 12, air is blown out from the face outlet 9 or the foot outlet 11.

Here, the mode switching door 12 automatically rotates in response to a mode switching signal to direct air to the face outlet 9, the defrost outlet 10, or the foot outlet 1.
It is designed to blow out from 1. Note that when the defrost switch 13 is operated, the defrost outlet 1
It becomes DEF mode where air blows out from 0.

Further, the amount of air blown by the blower 5 is controlled based on a synchronization signal T that includes internal air temperature and the like as a factor. The relationship between the total signal T and the amount of air blown W is shown in FIG. In the figure, the section A side is the heater mode, and the section B side is the cooler mode.

Further, 14 is a cooler disposed in the cavity 2 of the ventilation duct 1, and 15 is a pipe 1 connected to the cooler 14.
6 is a condenser connected to the condenser 15;
A compressor is shown connected to the cooler 14 by pipes 18 and 19, and these coolers 14,
A cooling cycle 20 is configured by the condenser 15, compressor 17, and the like. Therefore, the air taken in from the air intake section 3 is cooled by the cooler 14 while passing through the cavity section 2.

Further, 21 is a heater core provided on the downstream side of the cooler 14, and the heater core 21 is connected to a radiator 25 through pipes 23 and 24 with a control valve 22 interposed in the middle, through which cooling water flows. The heater core 21 is heated. Therefore, the air taken in from the air intake section 3 is heated in the heater core 21.

Note that 26 is an air mix door provided upstream of the heater core 21, and the air mix door 26 is designed to rotate in the vertical direction in the figure. Here, when the air mix door 26 is in the solid line position in the figure, the air does not come into contact with the heater core 21 and is therefore not heated, and when the air mix door 26 is in the dashed line position, the air is not heated by the heater core 21. The air is heated, and the temperature of the air can be adjusted by adjusting the position of the air mix door 26. Note that 27 indicates an engine.

[Problem that the invention seeks to solve]

By the way, in the conventional vehicle air conditioner configured as described above, when the defrost switch 13 is operated, the blower 5 is driven to the maximum, and the maximum amount of air is blown out from the defrost outlet 10 to perform a defrost action.

However, such a vehicle air conditioner has a problem in that the drive noise of the blower 5 is large, which results in considerable noise.

On the other hand, Japanese Unexamined Patent Publication No. 58-61014 discloses an invention relating to a vehicle air conditioner.

In this invention, when in the DEF mode, it is determined whether the outside air temperature is high or low, and the amount of air blown is changed according to the outside air temperature, so the air is not always blown at the maximum amount. When the amount of air blown is small, the driving noise of the blower can be suppressed to some extent, but it still generates a considerable amount of driving noise, and has become a considerable source of noise.

SUMMARY OF THE INVENTION Accordingly, an object of the invention is to provide a vehicle air conditioner that effectively reduces the noise of a blower when in DEF mode.

[Means for solving problems]

The present invention provides a first setting means 3 for maximizing the amount of air blown by the blower when the defrost switch is on, the outside temperature is low, and the compressor is off.
5, and second setting means 36 for setting the air flow rate of the blower to a value lower than the maximum when the defrost switch is on, the outside temperature is low, and the compressor is on.

[Effect]

The first setting means 35 maximizes the air flow when the defrost switch is on, the outside temperature is low, and the compressor is off, and the second setting means 36 maximizes the air flow when the defrost switch is on and the outside temperature is low. Set the air flow rate to a value lower than the maximum when the sampler is on.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. Note that the same components as those in the prior art are given the same reference numerals, and the description thereof will be omitted.

However, numeral 31 indicates a defrost switch detection means for detecting whether the defrost switch 13 is turned on or off. Reference numeral 32 indicates an outside air temperature determining means that compares the outside air temperature with a predetermined temperature and determines whether the outside air temperature is high or low. Further, numeral 33 indicates compressor determining means for determining whether the compressor 17 is on or off.

34 is a blower control means, and the blower control means 3
4 is the defrost switch detection means 31, outside air temperature determination means 32, and compressor determination means 33.
The amount of air blown by the blower 5 is controlled based on the output of the air blower 5. The blower control means 34 has a first
A setting means 35, a second setting means 36, a third setting means 37, and a fourth setting means 38 are provided.

Here, when the defrost switch 13 is on, the outside temperature is low, and the compressor 17 is off, the first setting means 35 controls the blower 5 so that the amount of air blown reaches the maximum as shown by A in FIG. It's starting to be controlled.

Further, when the defrost switch 13 is on, the outside air temperature is low, and the compressor 17 is on, the second setting means 36 sets the airflow amount to a predetermined value lower than the maximum as shown by B in FIG. The blower 5 is controlled accordingly.

Further, the third setting means 37 sets the S value in FIG.
The air blower 5 is controlled so that the air blowing amount characteristic line according to the prior art shown in FIG.

Furthermore, when the defrost switch 13 is on, the outside temperature is high, and the compressor 17 is off, the fourth setting means 38 sets the air flow to a predetermined value lower than the maximum as shown by D in FIG. The blower 5 is controlled accordingly.

The vehicle air conditioner according to the present invention is configured as described above, and its operation will be explained next.

First, in step S1, a total signal T is input, and in step S2, it is determined whether or not to turn off the blower 5 based on the above-mentioned total signal T. If the blower 5 is to be turned off, the blower 5 is turned off in step S3.

On the other hand, if the blower 5 is not turned off in step S2, it is determined in step S4 whether or not the blower 5 is under automatic control, and if it is under manual control, the blower 5 is manually controlled in step S5.

Further, in step S4, if the defrost switch 13 is set to automatic, the defrost switch detection means 31 detects whether the defrost switch 13 is turned on or off in step S6.
3 is off, the blower 5 is automatically controlled as before in step S7.

On the other hand, if the defrost switch 13 is off in step S6, the outside air temperature determination means 32 determines whether the outside air temperature is high or low in step S8, and as a result, when the outside air temperature is low, that is, in the heater mode, the step In S9, the compressor determining means 33 determines whether the compressor 17 is on or off.

As a result, when the compressor 17 is off, the first setting means 35 controls the blower 5 in step S10 to maximize the amount of air blown. This provides a defrost effect.

Further, when the compressor 17 is turned on in step S9, the second setting means 36 controls the blower 5 in step S11 to set the blowing amount to a predetermined value lower than the maximum. This reduces the driving sound of the blower 5, and as a result, the noise is reduced compared to the prior art. In this case, since the compressor 17 is on, there is a dehumidifying effect, and therefore, even if the amount of air blown is reduced as described above, a large defrosting effect can be expected.

Next, in step S8, when the outside air temperature is high, the compressor determining means 33 determines whether the compressor 17 is on or off in step S12.

As a result, when the compressor 17 is on, the third setting means 37 is set to the second setting in step S13.
As shown by C in the figure, the amount of air blown is shifted slightly in the direction of increasing the amount of air, thereby performing a defrosting action while adjusting the interior of the vehicle.

Further, when the compressor 17 is off in step S12, the fourth setting means 38 sets the air blowing amount to a predetermined amount as shown by D in FIG. 2 in step S14. In this case, since the amount of air blown is fixedly maintained at a predetermined amount, the defrosting action is performed with priority over the air conditioning of the vehicle interior.

In the above embodiment, different values were selected for B and D in FIG. 2, but they may be the same value.

〔effect〕

As explained above, according to the present invention, the first setting means maximizes the air flow when the defrost switch is on, the outside temperature is low, and the compressor is off; Since the second setting means is provided for setting the air flow rate to a predetermined value lower than the maximum when the outside air temperature is low and the compressor is on, when the compressor is on, the compressor dehumidifies the air to a predetermined value. The amount of air blown can be reduced while maintaining the defrosting effect, thereby reducing the driving sound of the blower by the amount of reduction in the amount of air blown, and suppressing noise generation.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a vehicle air conditioner according to the present invention, Fig. 2 is a characteristic diagram showing the relationship between the phase signal and the airflow amount, Fig. 3 is a flow diagram, and Fig. 4 is a diagram of a vehicle according to the prior art. FIG. 5 is a diagram showing the configuration of the air conditioner for use in air conditioning, and is a characteristic diagram showing the relationship between the phase signal and the amount of air blown. 5...Blower, 13...Defrost switch,
17... Compressor, 31... Defrost switch detection means, 32... Outside air temperature determination means, 33
. . . Compressor determination means, 35 . . . first setting means, 36 . . . second setting means.

Claims (1)

[Claims] 1 defrost switch detection means for determining whether the defrost switch is on or off; outside temperature determination means for determining whether the outside air temperature is high or low; and compressor determination means for determining whether the compressor is on or off;
It is composed of the defrost switch detecting means, the outside air temperature determining means, and the blower controlling means for controlling the blower based on the output of the compressor determining means, and the blower controlling means is configured so that the defrost switch is on and the outside air temperature is low. a first setting means for maximizing the airflow rate of the blower when the compressor is off; and a first setting means for setting the airflow rate of the blower to a predetermined value lower than the maximum when the defrost switch is on, the outside temperature is low, and the compressor is on. 1. A vehicle air conditioner comprising: second setting means for setting.