JPS6021097B2 - Anti-fog device for vehicle window glass - Google Patents

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to an anti-fog device for a window glass of a vehicle such as an automobile.

Conventionally, anti-fogging of the wheel windows of automobiles, etc. has generally been done using a fog-proofing method. The front window glass and side window glass are equipped with a hot air defroster, and the rear window glass is equipped with a hot-air defroster. Both the defroster and defogger increase the temperature of the inner surface of the window glass to keep the air in contact with the inner surface of the window glass above the dew point, remove dew adhering to the inner surface of the window glass, and prevent fogging due to dew. Defroster and defroster work effectively when the temperature is relatively low, such as in winter, but they are not as effective when it is humid, such as during the rainy season.Furthermore, if the defroster operates at this time, the interior of the vehicle becomes even more humid, and the occupants may cause discomfort.

An object of the present invention is to provide a new anti-fogging device that effectively removes fogging caused by fog on window glass or prevents the occurrence of fogging in all seasons without causing discomfort to passengers. Another object of the present invention is to provide an anti-fogging device that automatically operates according to temperature and humidity, so that the occupant does not have to pay attention to anti-fogging.

According to the present invention, these objects include a hot-wire defogger attached to a window glass, a dehumidifier in a vehicle interior, a temperature sensor that detects temperature and generates a temperature signal in accordance with the temperature, and a sensor that detects humidity and responds accordingly. a humidity sensor that generates a humidity signal related to humidity; a first reference signal generation circuit that generates a first reference signal related to temperature; a second reference signal generation circuit that generates a second reference signal related to humidity; a third reference signal generation circuit that generates a third reference signal; a first comparator that compares the temperature signal with the first reference signal;
a second comparator for comparing the humidity signal and the second reference signal; a third comparator for comparing the humidity signal and the third reference signal; a logic circuit that determines a combination of outputs of three comparators, and the temperature detected by the temperature sensor is equal to or lower than a first predetermined value, and the humidity detected by the humidity sensor is a second predetermined value. When the above is the case, the hot wire defogger is activated, and when the temperature detected by the temperature sensor is above the first predetermined value and the humidity detected by the humidity sensor is above the third predetermined value, the above This is achieved by a wheel window glass protection device characterized in that it operates a vehicle interior dehumidifying device.

According to this configuration, when the temperature is below a predetermined value and the humidity is above a predetermined value, such as in winter, the window glass is heated by the thermal spring type defogger to prevent clouds, and during high humidity such as the rainy season, When the temperature is above a predetermined value and the humidity is above a predetermined value, the interior of the vehicle is dehumidified, and thereby the window glass is fog-proofed without causing discomfort to the occupants.

Further, according to a detailed feature of the present invention, the vehicle interior dehumidifying device may be an air mix type or full reheat type wheel air conditioner installed in the wheels. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a block diagram showing one embodiment of a cloud protection device according to the present invention.

In the figure, 1 indicates a temperature sensor, and 2 indicates a humidity sensor. The temperature sensor 1 is configured to detect, for example, the outside temperature and generate a temperature signal corresponding to the outside temperature. Further, the temperature sensor 2 detects the humidity in the vehicle interior and generates a humidity signal in accordance with the detected humidity. Temperature sensor 1
The temperature signal and humidity signal generated by the humidity sensor 2 are input to the control device 3, respectively. The control device 3 controls the hot wire type defogger 4 and the vehicle interior dehumidifier 5 based on the temperature signal and the humidity signal.
An operation command signal is selectively output to each of the. The hot wire defogger 4 is attached to the rear window glass,
When the heating wire is energized, it generates heat and raises the temperature of the rear window glass, thereby preventing dew formation on the inside surface and frost formation on the outside surface of the window glass. The vehicle interior dehumidifier 5 may be an air mix type air conditioner or a full reheat type air conditioner provided in the wheels. If the automatic air conditioner is an air conditioner, when an activation signal for cloud prevention is given from the control device 3, the automatic air conditioner interrupts the automatic control based on the outside temperature and performs dehumidification operation. It is composed of FIG. 2 is a block diagram showing the configuration of the control device 3. As shown in FIG.

The control device 3 includes three comparators 7, 8, 9. The comparator 7 compares the temperature signal Tem generated by the temperature sensor 1 and the reference signal Q (corresponding to approximately 0° C.) generated by the reference signal generation circuit 10, and when the temperature signal Tem is smaller than the reference signal, An on signal is output to the inhibit terminals of the AND gate 11 and the AND gate 14, and an OFF signal is output to the inhibit terminals of the AND gate 11 and the AND gate 14 when the temperature signal Tem is larger than the reference signal Q. It looks like this. The comparator 8 compares the humidity signal Hum generated by the humidity sensor 2 with the reference signal 8 (corresponding to relative humidity 80 to 90%) generated by the reference signal generation circuit 12, and calculates the humidity signal H.
When mm is smaller than the reference signal 8, an off signal is output to the AND gate 11, and when the temperature signal m is larger than the reference signal 8, an on signal is output to the AND gate 11. A comparator 9 compares the humidity signal Hum generated by the humidity sensor 2 with the reference signal y (relative humidity 50 to 60%) generated by the reference signal generation circuits 1 to 3.
When the humidity signal Hum is 4 points lower than the reference signal y, an off signal is output to the AND gate 14, and when the humidity signal is greater than the reference signal y, an OFF signal is output to the AND gate 14. It is designed to output an on signal. The AND gate 11 is connected to the hot wire defogger 4, and the AND gate 14 is connected to the vehicle interior dehumidifier 5.

The star protection device constructed as described above operates according to the flowchart shown in FIG.

That is, when the temperature is below a predetermined value and the humidity is above a predetermined value, the hot wire defogger 4 operates. On the other hand, when the temperature is above a predetermined value and the humidity is above a predetermined value, the vehicle interior dehumidifier 5 is activated. The reference signal y generated by the reference signal generating circuit 13 may be variably set according to the vehicle interior temperature, as shown in FIG. FIG. 5 is a block diagram showing another embodiment of the antifogging device according to the present invention.

In FIG. 5, parts corresponding to those in FIG. 2 are designated by the same reference numerals as in FIG. 2. In this embodiment, a humidity sensor 15 is provided which detects the humidity outside the vehicle and generates a humidity signal in response to the humidity. A humidity signal generated by the humidity sensor 15 is provided to a comparator 16 of the control device 3. The comparator 16 compares the humidity signal with a reference signal 6 (equivalent to 80 to 90% relative humidity) generated by the reference signal generation circuit 17, and outputs an off signal to the OR gate 18 when the temperature signal is smaller than the reference signal y. , when the humidity signal is larger than the reference signal 6, an ON signal is output to the OR gate 18. The OR gate 18 is supplied with the signal generated by the comparator 8 and is also connected to the AND gate 11. In the case of this embodiment, the hot wire defogger 4 operates if the temperature is below a predetermined value and at least one of the humidity inside the vehicle or the humidity outside the vehicle is above a predetermined value.

In this case, the hot wire defogger 4 operates when dew forms on the inner surface of the window glass and when frost forms on the outer surface of the window glass to avoid fogging of the window glass. Although specific embodiments of the present invention have been described in detail above, it will be understood by those skilled in the art that the present invention is not limited to these and that various embodiments can be made within the scope of the present invention. It's obvious.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the anti-fogging device according to the present invention, FIG. 2 is a block diagram showing one embodiment of the anti-fogging device according to the present invention in which a control device is shown in detail, FIG. 3 is a flowchart explaining the operation of the anti-fog device according to the present invention, FIG. 4 is a graph showing an example of change in the reference signal y with respect to the temperature inside the vehicle, and FIG. 5 is another example of the anti-fog device according to the present invention. FIG. 2 is a block diagram showing an example. 1-temperature sensor, 2-humidity sensor, 3-control device, 4-
Hot wire defogger, 5~vehicle interior dehumidifier, 7~9~comparator, 10~reference signal generation circuit, 11~and gate, 1
2, 13~Reference signal generation circuit, 14~AND gate, 1
5 - Humidity sensor, 16 - Comparator, 17 - Reference signal generation circuit, 18 - OR gate. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A hot wire defogger attached to a window glass, a vehicle interior dehumidifier, a temperature sensor that detects temperature and generates a temperature signal in accordance with the temperature, and a temperature sensor that detects humidity and generates a humidity signal in accordance with the detected temperature. a first reference signal generation circuit that generates a first reference signal related to temperature; a second reference signal generation circuit that generates a second reference signal related to humidity;
a third reference signal generation circuit that generates a third reference signal related to humidity; a first comparator that compares the temperature signal and the first reference signal; and a comparison between the humidity signal and the second reference signal. a second comparator that compares the humidity signal with the third reference signal; and a third comparator that compares the humidity signal with the third reference signal, and determines a combination of outputs of the first, second, and third comparators. and a logic circuit that operates the hot wire defogger when the temperature detected by the temperature sensor is below a first predetermined value and the humidity detected by the humidity sensor is above a second predetermined value. Further, when the temperature detected by the temperature sensor is equal to or higher than the first predetermined value, and the humidity detected by the humidity sensor is equal to or higher than the third predetermined value, the vehicle interior dehumidifier is operated. An anti-fog device for vehicle window glass, characterized in that: 2. A hot-wire defogger attached to the window glass, a dehumidifier in the vehicle interior, a temperature sensor that detects the temperature and generates a temperature signal accordingly, and a temperature sensor that detects the humidity in the vehicle interior and generates a humidity signal in the vehicle interior accordingly. a vehicle interior humidity sensor that detects humidity outside the vehicle interior and generates a vehicle exterior humidity signal corresponding to the humidity; a first reference signal generation circuit that generates a first reference signal related to temperature; second, third, and fourth reference signal generation circuits that respectively generate second, third, and fourth reference signals related to the temperature signal; and a first comparator that compares the temperature signal and the first reference signal. a second comparator that compares the vehicle interior humidity signal and the second reference signal; a third comparator that compares the vehicle interior humidity signal and the third reference signal; a fourth comparator that compares the outdoor humidity signal with the fourth reference signal; and a logic circuit that determines a combination of outputs of the first, second, third, and fourth comparators; The temperature detected by the temperature sensor is less than or equal to a first predetermined value, and the humidity detected by the vehicle interior humidity sensor is greater than or equal to a second predetermined value, or the humidity detected by the vehicle exterior humidity sensor is equal to or less than a first predetermined value. When the temperature is at least one of the four predetermined values, the hot-wire defogger is activated, and the temperature detected by the temperature sensor is at least the first predetermined value, and the temperature detected by the vehicle interior humidity sensor is An anti-fogging device for a window glass of a vehicle, characterized in that the vehicle interior dehumidifying device is activated when humidity is equal to or higher than a third predetermined value.