JPH0131570Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a window fogging and antifreezing device used for vehicle windows.

(Prior art) Conventionally, vehicle window fogging and anti-freezing devices in which hot wires are installed in the windows, which are mainly used to ensure rear window visibility, have been used to prevent fogging and freezing during low-speed driving, even if visibility is secured.
When driving at high speeds, there was a problem in that the windows were cooled by the wind, causing them to fog up or freeze.

Therefore, the above problem was solved by increasing the heat generating capacity of the hot wire installed in the window, but when the heat generating capacity was increased, the generating capacity of the alternator that charged the battery was small, and when driving at low speeds, the problem was solved. As the amount of discharge from the battery increases, the battery becomes over-discharged (battery dies), so we decided to install a timer so that the anti-fogging and anti-freezing device only operates for a certain period of time after being turned on.

For this reason, the conventional vehicle window anti-fog and anti-freeze devices do not operate continuously and cannot ensure continuous visibility to the rear when the outside temperature is low. It is very troublesome to have to insert the battery into the battery, and there is also the problem that the battery may become over-discharged if used at low speeds.

Also, it has been considered that multiple hot wires are arranged in parallel, and one of each hot wire is selected for use in conduction, or both hot wires are used in parallel for conduction. However, when hot wires are selected and used, there is a problem that some hot wires are not used and some unnecessary hot wires remain.

(Purpose of the invention) The present invention was made to solve the above-mentioned problems, and its purpose is to use a low-capacity hot wire when driving at low speeds, and to use a low-capacity hot wire when driving at high speeds. By using low-capacity heating wires in parallel, the heat generation capacity is increased, which allows continuous operation, eliminating the hassle of turning on the switch frequently and preventing the battery from over-discharging. The purpose of the present invention is to provide a device for preventing fogging and freezing of vehicle windows with no worries.

(Structure of the invention) In order to achieve the above-mentioned purpose, the structure of the invention is as follows.
A hot wire installed in a vehicle window is provided with a power supply terminal connected to an operating switch, a ground terminal, and an intermediate terminal between the power supply terminal and the ground terminal. and the earth side terminal and the intermediate terminal, or the power side terminal, the earth side terminal, and the intermediate terminal are connected to a polarity switching means that makes the polarities different, and the power is energized when the vehicle speed reaches a set speed. A vehicle speed sensing switch is connected to the polarity switching means.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing a vehicle window fogging and freezing prevention device A according to a first embodiment.

1 is a back window, 2 is a hot wire disposed in the back window, 3 is an activation switch for activating the prevention device A, 4 is a power supply side terminal, 5 is a ground side terminal, 6 is an intermediate terminal, and 7 is a polarity switch. means, 8
is a vehicle speed sensing switch.

The polarity switching means 7 is composed of a normally open relay switch 71 and a relay switch 72, and the normally open relay switch 71 is connected to the ground 91 in the closed state.
The relay switch 72 is normally connected to the ground 92 and connected to the power source when the relay is activated.

The normally open relay switches 71 and 72 are connected to a vehicle speed sensing switch 8, and when the vehicle speed sensing switch 8 is closed, the relays of both relay switches 71 and 72 are activated.

The vehicle speed sensing switch 8 is linked to a vehicle speed meter, and is configured to close when the meter speed reaches 80 km/h.

The operating switch 3 includes a vehicle interior switch 32 that operates a relay of a relay switch 31, and a relay switch 31 that energizes the hot wire 2 and the vehicle speed sensing switch 8.

Therefore, when using the vehicle window fogging and freezing prevention device A of the first embodiment described above, when the vehicle interior switch 32 of the operating switch 3 is closed, the relay of the relay switch 31 is activated, and the switch 31 is closed. A current flows through the hot wire 2 and the vehicle speed sensing switch 8.

The current flowing through the hot wire 2 flows from the terminal 4 through the intermediate terminal 6, through the terminal 5, through the relay switch 72, and to the ground 92.

At this time, the first hot wire 21 and the second hot wire 22, which are separated by the intermediate terminal 6, are in a series relationship.

Next, when the vehicle speed reaches 80 km/h, the vehicle speed sensing switch 8 senses this and closes the switch 8.
Current flows through the normally open relay switches 71 and 72, and the relays are activated. The normally open relay switch 71 is connected to the ground 91, and the relay switch 72 is connected to the power source.

Then, the current flowing through the hot wire 2 enters from the power supply side terminal 4 and flows to the ground 91 via the intermediate terminal 6, and the current flows from the ground side terminal 5 to the intermediate terminal 6.
The current flows to the ground side 91 through The resistance is increased by four times (when the resistance of the first hot wire 21 = the resistance of the second hot wire 22).

In addition, 10 is a battery, 93, 94, 95, 9
6 is earth.

As explained above, according to the vehicle window fogging and freezing prevention device A of the first embodiment, by simply changing the energizing circuit of one hot wire during high-speed driving,
The heat generating capacity increases four times without changing the current-carrying area, and the structure is simple.Also, even when the windows are cooled by the wind while driving, they do not fog or freeze, and can be used continuously. This eliminates the hassle of turning on the switch over and over again. Moreover, at low speeds when the alternator's power generation capacity is low, the heat generation capacity automatically decreases, causing the battery to over-discharge (battery rise).
This has the effect that it never becomes a problem.

Next, FIG. 2 is a circuit diagram showing a device B for preventing fogging and freezing of vehicle windows, which is a second embodiment of the present invention.

Note that the same components as in the first embodiment are given the same reference numerals, and the explanation thereof will be omitted.

The hot wire 2 of the prevention device B includes a first hot wire 21 extending from the power supply terminal 4 to the earth terminal 51, a second heat wire 22 extending from the power supply terminal 4 to the intermediate terminal 6, and from the intermediate terminal 6 to the earth terminal 5. The third heat ray 23 that reaches
The heating wires 21, 22, and 23 have the same resistance.

When the prevention device B is in the normal operating state, the first heating wire 21 is connected to the second heating wire 22 and the third heating wire 23.
In parallel, the second hot wire 22 and the third hot wire 23 are in series. However, the vehicle speed is 80km/
When the vehicle speed sensing switch 8 is closed, the relay switches 71 and 72 of the polarity switching means 7 are activated, and the first hot wire 21, the second hot wire 22, and the third hot wire 23 are activated.
are all in a parallel relationship, and the heat generation capacity is doubled.

The vehicle window fogging and antifreezing device B of the second embodiment described above also provides the same effects as the first embodiment.

Although the embodiments have been described above with reference to the drawings, the specific configuration of the present invention is not limited to the embodiments described above.

For example, as shown in FIG. 3, a timer 11 that bypasses the vehicle speed sensing switch 8 is connected to the vehicle window antifreeze device A of the first embodiment, and the operating switch 3
If the heat generation capacity is increased even during the first certain period of time when the window is closed, it will be possible to quickly defog the window when starting the vehicle, etc., which is even more preferable.

Furthermore, in the first embodiment, the normally open relay switches 71 and 72 may be connected with the opposite polarity as in the first embodiment. For example, as shown in FIG. A normally open relay switch 71 connected to the terminal 6 is connected to the power supply side (positive side), and a relay switch 72 connected to the power supply side terminal 4 connected to the power supply side (positive side) is connected to the ground 9. Even if it is switched so that It should be noted that the same components as in the first embodiment are given the same reference numerals and their explanations will be omitted.

Further, in the embodiment, the intermediate terminal is provided on only one hot wire, but it may be provided on each of a plurality of hot wires and each of the intermediate terminals may be connected to the polarity switching means 7.
In the example, the case where there is one intermediate terminal is explained, but
If there are multiple intermediate terminals, proceed as follows. If there is an odd number of intermediate terminals, connect either the power supply side terminal or the earth side terminal to the polarity switching means, and
The intermediate terminal may also be connected to the polarity switching means. If there is an even number of intermediate terminals, the power supply side terminal and the ground side terminal may be connected to the polarity switching means, and the intermediate terminals may also be connected to the polarity switching means.

In this case, the polarity of the intermediate terminals includes a mixture of intermediate terminals connected to the power supply side and intermediate terminals connected to the ground side terminal from the OFF state.

In addition, when an even number of intermediate terminals are provided, the same operation and effect as the present invention can be obtained even if only the intermediate terminals are connected to the polarity switching means and the power supply side terminals and the earth side terminals are not connected to the polarity switching means. For your reference, this information is provided.

(Effects of the invention) As explained above, according to the device for preventing fogging and freezing of vehicle windows of the present invention, the heat rays of the device continuously generate heat at a low capacity during normal operation, and the wind caused by the running wind causes Since the capacity is increased only when driving at high speeds when the alternator is cooled and the alternator has a large power generation capacity, the windows do not fog up or freeze even when driving at high speeds, and the battery is prevented from becoming over-discharged. Instead, you don't have to worry about turning on the switch frequently, and you don't have to worry about unnecessary heat rays being generated.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a circuit diagram showing the second embodiment, and FIGS. 3 and 4 are circuit diagrams showing other examples. 1...Window (back window), 2...Heat ray,
3... Operating switch, 4... Power supply side terminal, 5...
Earth side terminal, 6... Intermediate terminal, 7... Polarity switching means, 8... Vehicle speed sensing switch, 9... Earth,
10...Battery, A...First embodiment, B...
Second example.

Claims (1)

[Scope of utility model registration request] A hot wire installed in a vehicle window is provided with a power supply terminal connected to an operating switch, a ground terminal, and an intermediate terminal between the power supply terminal and the ground terminal. and the earth side terminal and the intermediate terminal, or the power side terminal, the earth side terminal, and the intermediate terminal are connected to a polarity switching means that makes the polarities different, and the power is energized when the vehicle speed reaches a set speed. A device for preventing fogging and freezing of a vehicle window, characterized in that a vehicle speed sensing switch is connected to the polarity switching means.