JPS62203855A - Device for preventing vehicle windshield from blurring - Google Patents

Abstract

PURPOSE:To prevent a deblurring means from wasting energy due to misjudgment, by providing a temperature detecting means for detecting the temperature around a humidity detecting means so that the humidity detecting means determines whether a windshield pane blurs or not if a temperature detected by the temperature detecting means is within a predetermined range. CONSTITUTION:The humidity at the inner surface of a windshield pane is detected by a humidity detecting means 1. Simultaneously, the temperature around the humidity detecting means 1 is detected by a temperature detecting means 2 so that the thus detected humidity is compensated in accordance with the detected temperature. In accordance with the compensated value, if the humidity exceeds a predetermined value, a first discriminating means 3 discriminates the blurring of the windshield pane, and delivers its output to a logic AND computing means 5. Meanwhile, when the output of the temperature detecting means 2 is within a predetermined range, a second discriminating means 4 delivers its output so that the gate of the logic AND means 5 is controlled so that it is opened while a deblurring means 6 such as a cooler in an air-conditioning device is controlled with a high degree of accuracy in accordance with an output signal from the first discriminating means 6.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is equipped with a humidity detector that detects changes in humidity as changes in electrical resistance, and de-fogs vehicle window glass in accordance with the humidity detected by the humidity detector. The present invention relates to an anti-fogging device for a vehicle window glass that operates a means.

(Prior art) Vehicle window glass fog prevention involves determining whether there is a possibility that the vehicle window glass will fog up based on a comprehensive signal related to the deviation between the detected vehicle interior temperature and the set vehicle interior temperature. If it is determined that there is a possibility, the compressor of the cooler that cools the inside of the car window will start operating at a lower temperature based on the humidity detected by the humidity detector that detects the humidity near the inner surface of the car window. To dehumidify the room,
It is disclosed in Japanese Patent Application Laid-Open No. 189625/1983.

In addition, instead of lowering the compressor's starting temperature, it is possible to increase the amount of air blown into the vehicle compartment, increase the number of outside air covers in the intake air of the vehicle air conditioner, or The same effect can be obtained by changing the air blowing into the defrost hole, and in either case, the defogging means is driven.

On the other hand, a humidity detector freezes when the ambient temperature drops to 0° C. and is no longer useful as a humidity detector.

For this reason, conventionally, as shown in Japanese Unexamined Patent Publication No. 59-758252, a temperature detector for detecting the ambient temperature of a humidity detector is provided, and the window glass is heated in accordance with the output of the temperature detector. Some devices are designed to prevent humidity detectors from freezing.

(Problems to be Solved by the Invention) However, when using a humidity detector as described above, even if the detected humidity to be detected is the same, the humidity detector exhibits an electrical resistance of << ti (hereinafter simply referred to as resistance value) is different, and there are variations in the humidity-resistance ratio.

Furthermore, the temperature of the humidity detector is corrected by detecting the ambient temperature in which the humidity detector is provided using a thermistor. However, the thermistor itself also has temperature-resistance%
There is variation in gender.

Due to these variations in characteristics, there has been a problem in which it is erroneously determined that the window glass is fogged even though it is foggy at high and low temperatures.

As a result, based on the misjudgment result, the defrost outlet is selected, which wastes energy because it unnecessarily activates the cooler of the vehicle air conditioner, and the defrost outlet is selected. There was a problem in that the condition was disturbed and the passengers felt uncomfortable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device for preventing spiders on a vehicle window glass, which solves the above-mentioned problems.

(Means for Solving the Problems) In order to solve the above problems, the present invention is constructed as shown in FIG.

Humidity detection means 1 for detecting the humidity on the inner surface of the window glass; and temperature detection means 2 for detecting the temperature near the humidity detection means 1.
, a first determining means 3 which corrects the humidity detected by the humidity detecting means 1 by referring to the temperature detected by the temperature detecting means 2, and determines from this corrected humidity that the window glass is in a fogged state; and a temperature detecting means 2. a second discriminating means 4 for discriminating whether the detected temperature is within a predetermined range; and an arithmetic means 5 for performing an AND operation on the discriminating output from the first discriminating means 3 and the discriminating output from the second discriminating means 4. 9. The cloud removal means 6 is configured to be driven in accordance with the output of the calculation means 5.

(Function) Since the present invention is configured as described above, the humidity on the inner surface of the window glass is detected by the humidity detection means 1. At the same time, humidity detection means 1
The temperature in the vicinity of is detected by the temperature detection means 2, the detected humidity is corrected in response to the detected temperature, and when the humidity is equal to or higher than a predetermined humidity based on the humidity corrected by the temperature, the first discrimination means 3, it is determined that the window glass is fogged, and its output is supplied to the AND calculation means 5.

On the other hand, when the output of the temperature detection means 2 is within the θf fixed range, for example, the temperature detected by the temperature detection means 2 exceeds 1°C.
When the temperature is less than 4°C, the second discrimination means 4 generates an output, and this output causes the AND operation means 5 to control the dart to be in the open state, and the output from the first discrimination means 3 is supplied. Along with this, the spider υ removal means 6 is driven. As a result, the spider υ is removed from the window glass.

(Example of the invention) The present invention will be described below with reference to one embodiment.

FIG. 2 is a block diagram showing the configuration of a vehicle air conditioner to which an embodiment of the present invention is applied.

Reference numeral 11 is an air conditioner main body, and 12 is a control device consisting of a microcomputer that controls the air conditioner main body 11.

The air conditioner main body 11 includes an intake damper 14 that selects an air intake port from the upstream side of the duct 13, and a blower 15 that sucks air through the intake damper 14 and blows it into the vehicle interior 21. An evaporator 16, a mix damper 17 that controls the amount of air that has passed through the evaporator 16 and which is guided to a heater core 18 (to be described later), and a heater core 18 into which cooling water for the vehicle internal combustion engine is introduced and which functions as a heater are arranged in this order. On the most downstream side of the duct 13 is a vent outlet 30 that guides air into the vehicle compartment 21. Mode switching dampers 19 and 20 are provided for switching air blowing modes to select the heat outlet 31 and the defrost outlet 32.

The intake damper #14 is driven by the motor actuator 33 and is controlled to be in the vehicle interior air circulation state or the outside air introduction state. Air blower 1 via intake damper 14
The air sucked in by the evaporator 5 passes through the evaporator 16 and is cooled when the cooler 27 containing the evaporator 16 is in operation. 23 is a compressor, 24 is a condenser, 25d is a receiver tank, and 26 is an expansion valve, which together with the evaporator 16 constitute a cooler 27. Rotation of the output shaft of the vehicle internal combustion engine is transmitted to the pulley 22 . The rotation of the pulley 22 is transmitted to the compressor 23 via the magnetic clutch 29, and this transmission drives the compressor 23 and operates the cooler 27.

The mixer nozzle 17 is driven by a seven-star actuator 34, and the amount of air passing through the heater core 18 is controlled by the opening degree of the mixer nozzle 17.

The vent Suita outlet 30 is provided to blow air toward the occupant's face, the heat outlet 31 is provided to blow air from the occupant's feet, and the defrost outlet 32 is provided to blow air from the inner surface of the window glass. be. Mode switching Danno 4
Reference numerals 19 and 20 are driven by a motor actuator 35 to provide a defrost outlet 32, a vent outlet 30, a heat outlet 31, a defrost outlet 32, and a heat outlet 3.
1. The vent outlet 30 and the heat outlet 31 are controlled to open.

On the other hand, a vehicle interior air temperature sensor 36, an evaporator temperature sensor 37 that detects the temperature of the air that has passed through the evaporator 16, that is, the temperature at point A, an outside air temperature sensor 38, a solar radiation amount detection sensor J that detects the amount of solar radiation, and a solar radiation amount detection sensor J that detects the amount of solar radiation. A humidity sensor 40, a temperature sensor 41 for detecting the temperature near the humidity sensor 40, a potentiometer 42 for setting the vehicle interior temperature, and a potentiometer 43 for detecting the opening of the mixer 17 are provided. .

For example, the output voltage obtained by dividing the power supply voltage by connecting a vehicle interior temperature sensor 36 composed of a resistor and a thermistor in series, that is, the output of the vehicle interior temperature sensor 36, the similarly obtained output of the evaporator temperature sensor 37, The output of the outside air temperature sensor 38, the output of the solar radiation detection sensor 39, the output of the humidity sensor 40, the output of the temperature sensor 41, and the output of the I tensimeter 42, 43 that divides the power supply voltage are connected to the A/R through a multi-breather (not shown). The data is supplied to a D converter 44, converted into digital data, and supplied to the control device 12.

In FIG. 2, reference numerals 46 to 50 are motor actuators 33 . This is a drive circuit that separately drives the motor of the blower 15, the magnetic clutch 29, and the motor actuators 34 and 35.

The control device 1lt12 basically includes a CPU 12-1,
7' ROM that stores the program tz-2 RAM that stores the data IL5. Input capo) 12-4*Output capo) 12-5.

A two-dimensional corrected humidity table in which corrected humidity data is stored corresponding to the output data of the temperature sensor 41 and the output data of the humidity sensor 4o is stored in a predetermined area of the ROM xz-2.

The digital data output from the A/D converter 44 is read through the input port 12-4 according to the program stored in the ROM tz-2, and the CPU IL
The data processed and calculated by IL5 is output to the drive circuits 46 to 5o via the output IL5.

ROM 12. The operation of one embodiment of the present invention will be explained with reference to the flowchart shown in FIG. 3 in accordance with a program stored in the computer.

For example, execution of the program is started by closing the ignition switch, and initial settings such as clearing the memory contents of the RAM 12-3 are performed (step a). Then, the output of the A/D converter 44 is read through the IL4 and temporarily stored in a predetermined area of the RAM IL30, and the total data T=T, 10, T, 102
4TD+5 are calculated and stored in TA+, T, and - (Stella fb). Here, T1 is the vehicle interior air temperature, T is the evaporator outlet air temperature, TA is the outside air temperature, and T8 is the amount of solar radiation, which is detected by sensors 36, 37, 38, and 39. Also, T.

is the set temperature set by the potentiometer 42, and 5 in K1- is a constant. Therefore, the total data T is related to the deviation between the set cabin temperature and the detected cabin air temperature, as well as the evaporator outlet air temperature.

It corresponds to the value corrected according to the outside temperature and the amount of solar radiation.
It can also be said to be a value related to the heat load for controlling the indoor air temperature to the set cabin temperature.

Following Stella fb, 6θ+β is calculated and stored in data TF=T+ (Stage C). Here, θ indicates the opening degree of the mix damper and 17, and the evaporator 16
The opening degree when all the air passing through the heater core 18 passes through the heater core 18 is set to θ=100%. Furthermore, 6 and β are constants. Therefore, r-ta T corresponds to the temperature of the air blown into one room.

Following step C, the amount of air blown by the blower 15 is controlled according to the pattern shown in FIG. 5(a) (step d). Next, the opening degree of the mix damper 17 is controlled in accordance with the curve shown in FIG. 5(b), and the driving set temperature of the compressor 23 is controlled in accordance with the pattern shown in FIG. 5(c)K, thereby adjusting the Everlake outlet air temperature. Temperature control is executed to control the energization of the magnetic clutch 29 so as to drive the compressor when T is higher than the temperature/main turn shown in FIG. 5(c) (step 1).

Following Stella 7'e, mode control is performed to select the vent outlet 30, heat outlet 31, vent outlet 30, and heat outlet 31 according to data T (stage f), and then dew condensation release control is performed. (Step g)
. Next, staging b is performed again.

Staging g is performed as shown in FIG.

When the temperature detected by the temperature sensor 41 exceeds 1°C
It is determined whether it is within the range of less than ℃ or 100 degrees (Stage g
1). Hysteresis may be provided for this temperature range determination as shown in FIG. 6(,).

In Stella fg1, when the temperature detected by the temperature sensor 41 is outside the temperature range, that is, when the temperature is 1'
When the temperature is below C, the temperature sensor 40 is in a frozen state or almost frozen, and (b) When the temperature is above 24° C., the window glass is not fogged. Therefore, in this case, the measurement by the humidity sensor 40 is meaningless, and step b is executed. When the temperature detected by the temperature sensor 41 is within the temperature range in step g1, the humidity detected by the humidity sensor 40 and the temperature detected by the temperature sensor 41 are referred to and R
The corrected humidity data is read from the corrected humidity table stored in the OM xz-2 (step gz), and it is determined whether the corrected humidity data is a relative humidity of 85% or more or 100 (step gs). When the relative humidity is 85 coefficients or higher in stage g3, it is determined that the window glass is in a foggy state.

When the corrected humidity data read in step g5 is less than 85% relative humidity, it is determined that the window glass is not fogged, and step b is executed following staging f3. When the corrected humidity data read in STEG3 is 85% or higher relative humidity, STEGG
, the air flow rate is increased regardless of the pattern shown in FIG.
Step g5).

Therefore, when going through the routines of steps g4 and g5, the amount of air blown by the blower is increased as a means for removing fog, and the fog on the window glass is cleared.

Further, in step f, the compressor drive set temperature shown in FIG. In addition, hysteresis may be provided for determining the relative humidity at the stellar fK as shown in FIG. 6(b).

Next, other embodiments of the present invention will be described.

FIG. 7 is a functional block diagram for another embodiment of the invention. In another embodiment of the present invention, the discrimination range of the second discrimination means 4 in one embodiment of the present invention is corrected depending on the presence or absence of the output of the correction instruction means 7 and in conjunction with the output of the discrimination range correction means 8. It is configured as follows.

Therefore, while the correction instruction means 7 is generating an output, the discrimination range of the second discrimination means 4 is corrected by the discrimination range correction means 8.Now, the correction instruction means 7 outputs an output when the electric atmosphere is humid. shall occur. In this case, a correction instruction signal is generated based on an output that detects (a) a rain switch on state, (b) a raindrop detection state by a raindrop detection switch, or (c) a headlight lighting state. That is, (a) and (b) are in a rainy state, and G/→ is a nighttime state, and the outside of the vehicle is humid. Therefore, in the case of the present embodiment, the case of YI? The output of the switch, the output of the raindrop detection switch, or the output of the headlight switch is supplied to IL4 (in addition to those shown in FIG. 1) to determine whether the outside of the TL is humid.

When the dew condensation release control routine is entered, it is determined whether or not the distortion is in a humid state as shown in FIG. 8 (step g1.).

When the outside of the vehicle is humid, the dew point temperature is high and the vehicle is judged to be more likely to become cloudy. Therefore, when the outside of the vehicle is humid, the temperature detected by the temperature sensor 41 is 1°C to 2°C following the step 'h1.
It is determined whether the temperature is within the range of 9° C. (step g, 2).

When the humidity is outside this range, either the humidity sensor 40 is frozen or almost frozen, or the window glass is not fogged. Therefore, Stella fb is executed following Stella "'12. If it is within the above range in step "12, Stella fg2 is executed.

If the outside of the vehicle is not humid in step fg11, step g13 corresponding to step g is executed. This fi is the same as in the first embodiment, and it is determined whether the temperature detected by the temperature sensor 41 is within the range of 1° C. to 24'° C. (step g, 5).

If the temperature is outside the range of 1℃ to 24℃, step fb is executed following step g15, and if it is within the range, Stella fg is executed.
K Subsequently, step g2 is executed. The following is the same as one embodiment of the present invention.

In addition, in other embodiments of the present invention, a case where the discrimination range is set to Class 2b has been exemplified, but it is also possible to set an even narrower discrimination range.

(Effects of the Invention) As explained above, according to the present invention, the temperature near the humidity detection means is detected, and only when this temperature is determined to be within a predetermined temperature range, the humidity detection means determines whether the window glass is fogged or not. Misjudgments are reduced by making sure to distinguish between the two.

Further, the fog removal means is not driven due to an erroneous determination result, and wasteful energy consumption can be avoided.

Further, even if the resistance value of the humidity detection means varies toward a high resistance value side, malfunctions due to electromagnetic noise can be prevented. Furthermore, since the temperature range for determining cloudiness by the humidity detection means is limited, there is an effect that even a low-precision humidity detection means can detect a cloudy state with substantially high accuracy.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing the configuration of the present invention. FIG. 2 is a block diagram showing the configuration of a vehicle air conditioner to which an embodiment of the present invention is applied. wE3 and FIG. 4 are flowcharts for explaining the operation of one embodiment of the present invention. FIG. 5 and FIG. 6 are diagrams for explaining the operation of an embodiment of the present invention. FIG. 7 is a functional block diagram showing the configuration of another embodiment of the present invention. FIG. 8 is a main part of a flowchart for explaining the operation of another embodiment of the present invention. FIG. 9 is a diagram for explaining the operation of another embodiment of the present invention. 1... Humidity detection means, 2... Temperature detection means, 3...
・First discrimination means, 4... Second discrimination means, 6... Cloud removal means.

Claims (2)

[Claims] (1) A humidity detection means for detecting the humidity on the inner surface of a vehicle window glass; a temperature detection means for detecting the temperature near the humidity detection means; and a humidity detection means for detecting the humidity by the humidity detection means with reference to the temperature detected by the temperature detection means. and a second determining means for determining that the temperature detected by the temperature detecting means is within a predetermined range; A fogging prevention device for a vehicle window glass, comprising a calculating means for performing a logical AND operation on the output from the first determining means and the output from the second determining means, and driving a fogging means by the output of the calculating means. (2) The anti-fogging device for a vehicle window glass as set forth in claim 1, wherein the second discrimination means has a discrimination range that is changed in relation to the humidity of the outside air of the vehicle.