JPS62203856A - Defogger device for vehicle - Google Patents

Abstract

PURPOSE:To aim at enhancing the manipulatability of a defogger, by providing a switch means for feeding power from a battery to a heating wire in accordance with the output of a vehicle speed detecting means. CONSTITUTION:During a high speed running at a low ambient temperature, when a defogger switch 4 is turned on and the vehicle speed reaches a set value, a set vehicle speed detection signal is delivered from a vehicle speed sensor 16, and is applied to a comparator 18 through a converter 19. Then a signal '1' is delivered from the comparator 18 to an input terminal 21 of an R circuit 10 to control the energization of a next stage transistor 13. As a result a normally open contact 8 in a relay is turned on so that power is continuously fed from a battery 3 to the heating wire 2. Accordingly, during high speed running at a low ambient temperature is particular, it is unnecessary for the driver to repeatedly turn on the defogger switch 4, and therefore, it is possible to aim at enhancing the manipulatability of the defogger.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention uses a heating wire installed in the rear window of a vehicle to remove fogging caused by the difference between the temperature inside the vehicle and the outside temperature. Concerning the installation of such vehicles.

(Prior Art) Conventionally, as the defogger Nu for the vehicle of the above-mentioned example, there is a device described in, for example, Japanese Utility Model Application Publication No. 57-118962.

In other words, a plurality of hot wires are arranged in the rear window of the vehicle, and at the output stage of the battery mounted on the vehicle,
This is a defogger device in which a defogger switch and a timer circuit are connected in this order, and the above-mentioned hot wire is connected to the output side of the timer circuit.

In this defogger device, when the above-mentioned Aotsu turns on the switch, the power from the battery is printed on the timer circuit via the above-mentioned defogger switch, and the above-mentioned hot wire is activated only for a preset time, for example, 15 minutes by this timer circuit. Electricity is applied, the fog on the rear window is removed,
Improves window clearing performance.

Here, the above-mentioned timer circuit is a circuit that prevents the driver from forgetting to turn off the defogger switch, and also prevents the alternator from exceeding its capacity due to energization of the hot wire.

However, such conventional devices have the following problems.

In other words, the power supply to the hot wire described above is cut off after the time set by the timer circuit has elapsed, so for example, when driving at high speed in a low temperature outside atmosphere, the degree of cooling of the rear window increases in proportion to the increase in vehicle speed. It's time [The power supply to the hot wire of the driver cannot perform sufficient defogger, so the driver repeatedly turns on the defogger switch mentioned above.
The problem is that such operations are extremely troublesome.

(Object of the invention) This invention continuously supplies battery power to the hot wires independently of the timer circuit when the alternator output reaches a set vehicle speed that exceeds the vehicle full load. To provide a defogger device for a vehicle that can ensure window clearing performance without exceeding the capacity of an alternator and has good operability.

(Structure of the Invention) The present invention includes a TJ speed detection means for detecting a set vehicle speed, and a switch means disposed on the primary side of the hot wire and supplying battery power to the hot wire based on the output of the vehicle speed detection means. The present invention is characterized by being a defogger device for a vehicle.

(Effects of the Invention) According to the present invention, when the alternator output exceeds the vehicle full load at a set vehicle speed, for example, the alternator rotational speed is 5000 r.
l) When reaching Im, the above-mentioned switch means is actuated by the output from the above-mentioned vehicle speed detection means, and the switch means continuously supplies battery power to the above-mentioned hot wire regardless of the timer circuit. I can do it.

As a result, the driver does not have to turn on the defogger switch repeatedly, as in the conventional case, especially when driving at high speeds at low outside temperatures, thereby improving operability.

Further, there is an effect that the clear window performance can be ensured without the alternator output exceeding 8 outputs.

(Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a defogger device for a vehicle, and in FIG. a battery 3 interposed between the above-mentioned hot wire 2 and the battery 3;
A defogger switch 4 that manually turns on and turns off the power supply from
A timer circuit 5 is provided to supply power to the hot wire 2 for a predetermined period of time, for example, 15 minutes when the switch 4 is turned on by default.

Here, the above-mentioned timer circuit 5 is connected to the defogger switch 4.
Connected between the normally open contact 8 of the relay 7 and the relay coil, which are interposed in the line 6 connecting the secondary side of the and the primary side of the hot wire 2, and the above-mentioned line 6 and one input end 11 of the OR circuit 10. and a transistor 13 as a semiconductor switching element whose base electrode is connected to the output stage of the OR circuit 10, whose collector electrode is connected to the secondary side of the relay coil 9, and whose emitter electrode is connected to the ground.

In addition, the output stage of the battery 3 and the defogger switch 4 mentioned above
An ignition switch 14 and a fuse 15 are interposed between the two.

By the way, on the primary side of the above-mentioned hot wire 2, more specifically, on the input side of the OR circuit 10, there is a vehicle speed sensor 16 as a vehicle speed detection means for detecting the set I speed, and the above-mentioned operation is performed based on the output of this vehicle speed sensor 16. A non-contact switch circuit 17 serving as a switch means for supplying battery 3 power to the hot wire 2 is connected.

The above-mentioned vehicle speed sensor 16 outputs the alternator output so-called 'Fitl!' shown in FIG. Outputs a set vehicle speed detection signal when the set vehicle speed corresponds to an output of 70 amperes that exceeds the vehicle full load of 65 amperes, for example, when the alternator rotational speed reaches 5000rpa+ (when the pulley ratio is 2:1, the engine rotational speed is 2500rpm). do.

The non-contact switch circuit 17 also includes a comparator 18, one rotation speed-to-voltage converter interposed between one input terminal of the comparator 18 and the vehicle speed sensor 16, and the above-mentioned comparator. A resistor 20 for setting a comparative output is connected between the other input terminal of the comparator 18 and the ground, and the output stage of the comparator 18 is connected to the other input terminal 21 of the above-mentioned OR circuit 10. are doing.

The illustrated embodiment is constructed as described above, and its operation will be explained below.

First, regarding the defogger using the normal timer circuit 5, when the ignition switch 14 is turned ON and the defogger switch 4 is turned ON to remove fogging from the rear window 1, the power of the battery 3 is turned ON. Applied to timer 12 via elements 14, 15.4.6.

Therefore, the upper input terminal 11 of the OR circuit 10 has “1
J signal is applied, and this rIJ signal is applied to the above-mentioned OR circuit 1.
Since it is ORed with 0 and output, the output stage transistor 13 of the OR circuit 10 becomes conductive.

As a result, current flows through the relay coil 9 of the relay 7,
Since the normally open contact 8 of the relay 7 is turned on, power from the battery 3 is applied to the hot wire 2 for a predetermined period of time, for example, 15 minutes, which is preset by the timer circuit 5, and the fogging of the leaf wind 1 can be removed by electrical heating. can.

Note that the above-mentioned normally open contact 8 automatically returns to the normally open position after the timer 12 times up.

Next, the defogging during high-speed driving will be explained.

Now, when the driver turns on the defogger switch 4 while driving at a high speed with a low outside temperature, and the vehicle speed reaches a speed corresponding to the alternator rotation speed of 5000 RAM shown in FIG. 2, for example, 807 mph, the vehicle speed A set vehicle speed detection signal is output from the center height 16, and this output is sent to the converter 1 described above.
9 to the comparator 18, so that the comparator 1
8 outputs a "1" signal as a comparison output.

This "1" signal is the lower input terminal 21 of the OR circuit 10.
After being applied to , it is logically summed by this circuit 10 and becomes "1".
It becomes an output and controls the conduction of the transistor 13 in the next stage.

As a result, the normally open contact 8 of the relay 7 is turned on, and power can be continuously supplied from the battery 3 to the hot wire 2.

Therefore, especially when driving at high speeds with low outside temperatures, the driver does not have to repeatedly turn on the defogger switch 4 as in the conventional case, which has the effect of improving the operability of the defogger switch 4.

In addition, the above-mentioned vehicle speed sensor 16 detects that the alternator output has reached the set vehicle speed that exceeds the vehicle full load, and the non-contact switch means 17 controls the energization of the hot wire 2, so that it is possible to prevent the alternator from exceeding its capacity. This has the effect of ensuring good clearing performance of the rear window 1 during high-speed driving without causing problems.

In the correspondence between the structure of the present invention and the above-described embodiment, the window of the present invention corresponds to the rear window 1 of the embodiment, the vehicle speed detection means corresponds to the vehicle speed sensor height 16, and the switch means corresponds to the rear window 1 of the embodiment. Although it corresponds to the non-contact switch circuit 17, the present invention is not limited to the configuration of the above-described embodiment. For example, in place of the above-described non-contact switch circuit 17, a switch means of a contact switch circuit may be used. Needless to say, it may be used.

Moreover, it goes without saying that other semiconductor switching elements such as FETs may be used in place of the above-mentioned transistor 13.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is an electric circuit diagram showing an f fogger device in white, and FIG.
The figure is a characteristic diagram showing the relationship between alternator output and alternator rotation speed. 1... Rear window 2... Heat wire 3... Battery 4... Defogger switch 5... Timer circuit 16... Vehicle speed sensor 17
... Non-contact switch circuit diagram 2

Claims (1)

[Claims] 1. Multiple hot wires installed in the vehicle window, It is installed in the vehicle and supplies electricity to the above hot wire. battery, The battery is interposed between the hot wire and the battery. Turning on and off the power supply from the battery defogger switch and Interpose between the above hot wire and the defogger switch. When the defogger switch is turned on, the upper A timer cycle that supplies power to the heat recording wire for a predetermined period of time. road and vehicle speed detection means for detecting a set vehicle speed; Arranged on the primary side of the above hot wire, the above vehicle speed inspection A battery is applied to the above hot wire based on the output of the output means. switch means for supplying power to the Vehicle defogger device.