JP2519427Y2 - Vehicle air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle air conditioning control device,
In particular, the present invention relates to prevention of fogging of window glass during vehicle air conditioning operation.

(Prior Art) As a conventional vehicle air-conditioning control device, for example, Japanese Patent Laid-Open No.
As described in JP-A-174017, when the outside air temperature is higher than the set value, a compressor as an air conditioning control target is operated to blow dehumidified air onto the window glass, and when the outside temperature is lower than the set value, the air conditioning is performed. It is disclosed that the inside / outside air switching door as the control target is switched to the outside air introduction side, and the warm air is blown to the window glass by adjusting the opening degree of the air mix door, thereby removing the fogging of the window glass. There is.

(Problems to be solved by the invention) However, in the configuration of the related art, the fogging of the window glass can be removed when a predetermined setting condition is satisfied, but thereafter, the fogging state is again caused by a change in the air conditioning state. When it appears, it is necessary to perform the defogging operation again, and the appearance of the defogging state during that time causes a problem that, for example, driving is hindered.

An object of the present invention is to provide a vehicular air-conditioning control device that can prevent the appearance of a cloudy state at all times.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a fogging detecting means for detecting the fogging level on the inner surface of a window glass, and fogging for determining whether or not the fogging level is above a predetermined level. A vehicle air-conditioning control device comprising level determination means and demist control means for controlling a plurality of air-conditioning control targets so as to remove fogging on the window glass when the fogging level is equal to or higher than the predetermined level. When the fogging level of the inner surface of the window glass is within a predetermined level range lower than the predetermined level, and when at least one of the air conditioning control targets operates on the side of increasing the fogging of the window glass, the air conditioning control It is characterized in that a fog preventing means for actuating any one of the other objects to the fog preventing side is provided.

(Operation) After the fogging of the window glass is removed by the demist control means, when the fogging level on the inner surface of the window glass is in a predetermined range lower than the predetermined fogging level, at least one of the air conditioning control targets has the fogging of the window glass. When activated on the increasing side, any other one of the air-conditioning controlled targets is activated on the anti-fog side.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 2, in the air conditioning control device of the present invention, an inside / outside air switching door 2 is provided at one end of an air conditioning duct 1, and a blower 3 and a compressor 4 are connected downstream of the door 2. The evaporator 5 and the heater core 6 are sequentially arranged, and the evaporator 5
The cool air that has passed through is adjusted in temperature by the air mix door 7 by adjusting the ratio of the one that passes through the heater core 6 and the one that bypasses the heater core 6. A defroster outlet 8, a vent outlet 9, and a foot outlet 10 are formed at the other end of the air conditioning duct 1, and the defroster door 11, the vent door 12, and the foot door are provided at each outlet 8, 9, 10. 13 are arranged respectively. Inside / outside air switching door 2, blower 3, compressor 4,
The defroster door 10 constitutes an air conditioning control target 14.

As shown in FIG. 1, the air-conditioning control target 14 is controlled by an air-conditioning control unit 15 which is composed of a microcomputer, and the air-conditioning control unit 15 does not show an inside air sensor, an outside air sensor, a solar radiation sensor, and a room temperature setting device. Etc., the driving direction and the control amount of the air conditioning control target according to the heat load and the set room temperature are calculated. Then, the air conditioning control target 14 is driven according to the calculation result (for example, the opening degree of the inside / outside air switching door 2, the air volume of the blower 3, the opening degree of the air mix door 7, etc. are set).

On the other hand, for example, a windshield (not shown) is provided with a relative humidity detecting means 16 as a fog detecting means for detecting the fog level of the inner surface of the windshield, and the fog level determining means according to the output of the relative humidity detecting means 16. The first fogging level determining means 17 and the second fogging level determining means 18 are operated respectively.

Here, as shown by the characteristic line P ₁ in FIG. 3, the first fogging level determining means 17 determines that the fogging level on the inner surface of the window glass is the minimum fogging level at which normal demist control should be performed.
Is determined to be equal to or higher than the level H _{1 of the} above, and the second fogging level determination means 18 determines whether the fogging level is between the characteristic line P ₁ and the characteristic line P _{2 of} FIG. , That is, the first
It is determined whether or not it is within the second level H ₂ range on the side where the degree of fogging of the window glass is slightly lower than the level H ₁ of. In FIG. 3, the vertical axis represents the relative humidity of the inner surface of the window glass, and the horizontal axis represents the temperature of the inner surface of the window glass.

The first fogging level determination means 17 drives the air conditioning control target 14 via the demist control means 19 when it is determined that the fogging level is equal to or higher than the first level H ₁ (for example, driving the blower 3,
The operation of the compressor 4, the opening of the defrost door 11, etc.), the second fog level determination means 18 is the time when it is determined that the fog level is within the second level H ₂ range, and at least one of the air conditioning control targets When one (for example, the blower 3) is operated on the side of increasing fogging (for example, a decrease in the amount of blown air), a means for preventing fogging
Air conditioning control target via 20 (for example, inside / outside air switching door 2)
Drive 14

Next, the operation of the embodiment configured as described above will be described with reference to the flowchart of FIG.

When the program shown in the flow chart is started, the output signal from the relative humidity detecting means 16 is input (step 101), whereby the first fogging level determining means 16 of the air conditioning control unit 14 is started.
The fogging level on the inner surface of the window glass is
It is determined whether or not it is in the H ₁ range (step 102),
When the determination result is affirmative (Yes), that is, when the humidity exceeds the characteristic line P ₁ at, for example, a certain temperature T, the defrosting control means 19 causes the defrost door to operate.
When 11 is opened, the compressor 4 is operated and the air volume of the blower 3 is increased if necessary, and the fog on the window glass is removed (step 103).

Further, when the determination result in step 102 is negative (No), that is, at a certain temperature T, for example, the characteristic line P ₁
When the above humidity is not exceeded, the fogging of the window glass is not at a level at which normal demist control should be performed, but in the device of the present invention, in step 104, the fogging level on the inner surface of the window glass is the second level H. It is determined whether or not it is within the _two ranges (step 104). If the determination result in step 104 is negative (No), that is, if the humidity does not reach the value on the characteristic line P ₂ at a certain temperature T, it is not enough to remove the fog on the window glass. Therefore, normal air conditioning control (temperature adjustment) is performed.

When the determination result of step 104 is affirmative (Yes), that is, when the humidity exceeds the value on the characteristic line P ₂ at a certain temperature T ′, the process proceeds to step 106. In this step 106, it is determined whether or not the air conditioning control target 14 is being driven to the fogging increase side of the window glass, and whether at least one of the air conditioning control targets 14 (for example, the blower 3) has been operated to the fogging increase side (the amount of blown air decreases Whether or not) is determined. If this determination result is affirmative (Yes), that is,
If the temperature on the inner surface side of the window glass has dropped to the temperature T, for example, and the relative humidity has risen, the routine proceeds to step 107, where the function of the fogging prevention control means 20 causes the air conditioning control target 14 other than the blower 3, for example, The inside / outside air switching door 2 is driven to the outside air intake side and is controlled in a direction to prevent fogging of the inner surface of the window glass. In this case, the drive of the air conditioning control target 14 is not limited to the above-described embodiment, and the blower 3 may be driven to the air volume increasing side when the inside / outside air switching door 2 is driven to the inside air circulation side, for example.

If the determination in step 106 is negative (No), that is, if none of the air-conditioning control targets 14 is driven to the side where the windshield is fog-increasing, it is not necessary to prevent fogging, and therefore step 101 is performed. Return.

(Effects of the Invention) As described above, according to the present invention, the fogging detecting means for detecting the fogging level on the inner surface of the window glass, and the fogging level determining means for determining whether or not the fogging level is above a predetermined level. And a demist control means for controlling a plurality of air-conditioning control targets so as to remove the fogging of the window glass when the fogging level is equal to or higher than the predetermined level. When the fogging level of the inner surface of the glass is within a predetermined level range lower than the predetermined level, and when at least one of the air conditioning control targets operates on the fogging increasing side of the window glass, any of the air conditioning control targets Since the other structure is provided with the anti-fogging means that operates on the anti-fogging side, the air conditioning control target is set to the anti-fogging side before the fogging of the window glass occurs. Since it can be moved, it is possible to always avoid the cloudy state of the window glass, reduce the temperature change in the passenger compartment, and thus the feeling change, and ensure a comfortable air conditioning state.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing an essential part of an air conditioning control device according to the present invention, and FIG. 3 is demisting control for relative humidity and temperature on the inner surface of a window glass. FIG. 4 is a program flow chart for explaining the operation of the embodiment shown in FIG. 14 ... Air-conditioning control target, 16 ... Relative humidity detecting means, 17 ... First fogging level determining means, 18 ... Second fogging level determining means,
19 ... Demist control means, 20 ... Fog prevention control means.

Claims (1)

(57) [Scope of utility model registration request] 1. A fog detecting means for detecting a fog level on an inner surface of a window glass, a fog level judging means for judging whether the fog level is above a predetermined level, and the fog level is above the predetermined level. In the vehicular air-conditioning control device provided with a demist control means for controlling a plurality of air-conditioning control objects so as to remove the fogging of the window glass, the fogging level of the inner surface of the window glass is higher than the predetermined level. When at least one of the air-conditioning control targets operates on the fogging increase side of the window glass while being in a low predetermined level range, one of the other air-conditioning control targets operates on the fogging prevention side. An air conditioning control device for a vehicle, characterized in that it is provided with means for preventing fogging.