JPH0742887Y2 - Vehicle windshield heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a vehicle windshield heating device, and more particularly to a heating device that requires a large amount of power for the purpose of deicing or ice protection.

B. Conventional Technology Conventionally, there is known a rear defogger device in which a heating resistance element (hereinafter referred to as a heat wire) is arranged on a rear glass for a vehicle and the heat wire is heated to prevent fogging of the rear glass. The calorific value required to prevent this fogging is not so large, but in order to remove the ice and the like adhering to the outer surface of the glass and to prevent the adhesion of ice, a much larger calorific value is required than the rear defogger device. The load on the electric device of the vehicle is increased. There has been a problem that it takes a long time to remove ice when trying to reduce this burden.

Therefore, a heating device that solves such a problem is Japanese Patent Publication No. Sho 61.
-33735. This device has a heating resistance element arranged on glass and sets a normal anti-fog mode and a deicing mode.In the anti-fog mode, the generator is connected to the heating resistance element by turning on the anti-fog switch. Supply relatively low electric power to the heating resistance element. In this mode, the output of the generator is guided to the voltage regulator and the generated voltage of the generator is limited to a predetermined value. On the other hand, when the deicing switch is turned on in the deicing mode, the voltage regulator is disconnected from the generator and connected to the battery. Therefore, the generated voltage is considerably higher than that in the anti-fog mode depending on the battery voltage, and a large amount of power is supplied to the heating resistor element to generate a large amount of heat. Then, after turning on the deicing switch, when a predetermined time elapses, the mode automatically returns to the anti-fog mode.

C. Problems to be Solved by the Invention However, in this conventional heating device, for example, since a single heating resistance element is arranged on the entire windshield,
During deicing, the windshield is uniformly heated over its entire surface. As a result, both the driver's seat side and the passenger's seat side are deiced in the same manner, so unless the entire windshield is deiced, the driver's view cannot be secured and it takes time to start.

An object of the present invention is to divide a heating resistance element into a driver's seat side and a passenger's seat side, and de-ice the driver's seat side first to ensure a driver's view early before starting the vehicle. To provide a windshield heating device.

D. Means for Solving Problems A description will be given with reference to FIG. 1 showing an embodiment. The present invention is a voltage regulator that outputs the output of a generator 21 that generates electricity by rotating an engine.
It is applied to a vehicle in which the power generation amount of the generator 21 is adjusted by leading to 22.

And the above-mentioned problems, the driver side heating resistance element 11A disposed on the driver side of the windshield, and the passenger side heating resistance element 11B disposed on the passenger side of the windshield,
The generator switch 21 and the command switch 43 for instructing the energization of the heating side resistance elements 11A and 11B on the driver side and the passenger side
A first state in which the voltage regulator 22 is connected to the battery 41 and a second state in which the voltage regulator 22 is disconnected from the generator 21 and connected to the battery 41
Switch means 31S, a second switch means 32S- ₁ inserted between the generator 21 and the driver's seat side heating resistance element 11A to electrically separate and contact them, and the generator 21 and the passenger's seat side heating resistance element. The third switch means 32S _-2 inserted between the first switch means 31S and the 11B and electrically connecting and disconnecting them and the first switch means 31S are set to the second state by turning on the command switch 43.
The switch means 32S _-1 of No. 3 is closed and the third switch means 32S _-2 is closed.
While the second switch means 32S _-1 is opened and the third switch means 32S _-2 is closed when a predetermined time elapses after the command switch 43 is turned on, the third switch means 32S _-2 is closed. And the switch control means 42 for opening the third switch means 32S _-2 and the third switch means 32S _-2 .

E. Action When the command switch 43 is turned on, the first switch means 31S
Becomes the second state and the second switch means 32S _-1
Is closed and the third switch means 32S _-2 is opened. Therefore, the driver seat side heating resistance element 11A generates heat and the driver seat side of the windshield is heated. At this time, the battery voltage, not the output of the generator 21, is guided to the voltage regulator 22, so that the output of the generator 21 is controlled to increase depending on the battery voltage, and the windshield is rapidly heated.

On the other hand, when a predetermined time has elapsed after the command switch 43 was turned on, the second switch means 32S _-1 is opened and the third switch means 32S is opened.
_-2 closes. For this reason, the energization to the driver seat side heating resistance element 11A is stopped, the energization to the passenger seat side heating resistance element 11B is started, and the passenger side of the windshield is heated.
Also in this case, as in the case described above, a larger amount of power generation is obtained and the windshield is rapidly heated compared to the case where the output of the generator 21 is adjusted by the voltage regulator 22.

Further, when a predetermined time elapses thereafter, the first switch means
31S is in the first state and third switch means 32S
_-2 opens and heating of the windshield ends.

It should be noted that, in the above-mentioned items D and E for explaining the configuration of the present invention, the drawings of the embodiments are used for the sake of easy understanding of the present invention, but the present invention is not limited to the embodiments.

F. Embodiment An embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 shows a heating device for a windshield of a vehicle having a known power generator, 11A being a heating resistance element arranged on the driver side of the windshield, and 11B being arranged on the passenger side of the windshield. It is a heating resistor element. The driver's seat side heat generation resistance element 11A is connected to the output terminals of a generator (hereinafter referred to as an alternator) 21 via relays 31 and 32, and the passenger seat side heat generation resistance element 11B is connected to each other via a relay 32. The relay 31 has a relay switch 31S and a relay coil 31C, and when the relay coil 31C is excited, the relay switch 3
In 1S, the b contact is closed and the a contact is opened, and when the relay coil 31C is demagnetized, in the relay switch 31S, the a contact is closed and the b contact is opened. The relay 32 has a normally closed relay switch 32S _-1 , a normally open relay switch 32S _-2, and a relay coil 32C.When the relay coil 32C is in the demagnetized state, the relay switch 32S _-1 is closed, and the relay switch 32S. _{When -2} is opened and excited, relay switch 32S _-1 opens and relay switch 32S _-2 closes.

Reference numeral 22 denotes a voltage regulator, which guides the output of the alternator 21 to the voltage regulator 22 so that the field winding 21a of the alternator 21 is
Is controlled to limit the output of the alternator 21 to a predetermined value. When the output voltage of the alternator 21 is high, the field current is reduced to reduce the power generation amount, and when the output voltage is low, the field current is increased to increase the power generation amount. Therefore, the voltage regulator 22 has a relay switch 31
The output of the alternator 21 is guided through the a contact of S.
Further, in order to obtain the output of the alternator 21 or more above the limit value during deicing, the voltage regulator 22 is configured so that the battery voltage is guided from the battery 41 to the voltage regulator 22 when the a contact of the relay switch 31S is opened. It is also connected to the battery 41.

One ends of the relay coils 31C and 32C are connected to the battery 41, and the other ends thereof are connected to the A terminal and the B terminal of the control circuit 42, respectively. By grounding the A and B terminals, the relay coil 3
1C and 32C are energized and excited respectively. The deicing command switch 43 is connected to the control circuit 42, the engine speed pulse and the vehicle speed signal are input, and the A terminal is turned on for a predetermined time (T ₁ + T ₂ ) after the deicing command switch 43 is turned on. It becomes a low level, and after a lapse of a predetermined time T _1, a predetermined time
The B terminal is at a low level until T ₂ elapses. Also,
When the vehicle speed signal comes in even during the elapse of the predetermined time T ₁ or T ₂ , the terminal A becomes high level.

In the configuration of the above embodiment, the relay switch 31S constitutes the first switch means, the relay switch 32S- ₁ constitutes the second switch means, and the relay switch 32S- ₂ constitutes the third switch means.

Next, the operation will be described with reference to FIG.

FIG. 1 shows a normal state, and when the deicing command switch 43 is turned on once in this state (within the time period a in FIG. 2A),
The A terminal of the control circuit 42 becomes low level (Fig. 2 (b)), the relay coil 31C is energized and excited, and the b contact of the relay switch 31S is closed and the a contact is opened (Fig. 2 ( c)). At this time, since the relay switch 32S _-1 is opened, the power generated by the alternator 21 is supplied only to the driver-side heating resistance element 11A, and the driver-side heating resistance element 11a generates heat to wind the windshield (not shown). To heat. On the other hand, since the a contact of the relay switch 31S is opened, a battery voltage lower than the output voltage of the alternator 21 is introduced to the voltage regulator 22. Because of this, the field winding
A larger field current flows through 21a, and the output voltage of the alternator 21 increases. And the voltage regulator 22 is the alternator 21.
Since the control by the output voltage is not performed, a large amount of electric power is continuously supplied to the driver seat side heating resistance element 11A, and the deicing proceeds quickly.

When a predetermined time T ₁ has elapsed after the deicing switch 43 was turned on, the B terminal of the control circuit 42 becomes low level (FIG. 2 (d)), and the relay coil 32C is energized and excited. Therefore, the relay switch 32S _-1 is opened and the relay switch 32S is opened.
_-2 is closed (Figs. 2 (e) and (f)), the energization to the driver side heat generating resistance element 11A is stopped, and the passenger side heat generating resistance element 1
1B is energized to generate heat, and defrosting of the windshield on the passenger side begins. At this time, since the relay switch 31S has the contact b closed subsequently (FIG. 2 (c)), a large amount of power is supplied to the passenger seat side heating resistance element 11B in the same manner as described above, and the relay switch 31S is quickly removed. The ice advances.

For a predetermined time T ₂ after the B terminal of the control circuit 42 becomes low level
After the lapse of time, both the B terminal and the A terminal are switched to the high level (FIGS. 2 (b) and (d)). As a result, the relay coils 31C and 32C are demagnetized, the a contact of the relay switch 31S is closed and the b contact is opened (Fig. 2 (c)), and the relay switch 32S _-1 is closed and the relay switch 32S is closed. _-2 opens (Fig. 2 (e), (f)). Therefore, the power supply to the passenger seat side heating resistance element 11b is cut off, the heating of the windshield is stopped, the output voltage of the alternator 21 is guided to the voltage regulator 22, and the power generation amount of the alternator 21 follows the output voltage. It is controlled by the voltage regulator 22 and becomes smaller than that during deicing.

Further, as shown in FIG. 2 (g), for example, when the vehicle speed signal rises during the measurement of the predetermined time T ₁ , the terminal A becomes high level and the relay switch 31S closes the contact a and opens the contact b. To be done. As a result, the energization to the driver's seat side heating resistance element 11A is stopped, while the voltage regulator 22 has an alternator.
The output of 21 is introduced and normal voltage adjustment is performed. At this time, the battery 41 is charged by the output of the alternator 21, so that the battery is prevented from running out.

Further, the above operation is permitted only while the engine is rotating. Therefore, the control circuit 42 receives the closing command of the deicing command switch 43 only when the engine rotation pulse is input.

As shown in FIG. 3, the relay 51 for the voltage regulator,
The driver side heat generating resistance element relay 52 and the passenger side heat generating resistance element relay 53 may be separately provided. By turning on the command switch 43, first, the A and B terminals of the control circuit 42 are set to low level to open the relay switch 51S and close the relay switch 52S, and after a predetermined time T ₁ , the B terminal is set to high level and the C terminal. To a low level to open the relay switch 52S and close the relay switch 53S. Further, after a predetermined time elapses, the A terminal and the C terminal are set to the high level to close the relay switch 51S to close the relay switch 5S.
Open 3S. With such an operation, it is possible to obtain the same effect as that of the device shown in FIG.

In the third embodiment, the relay switch 51S constitutes the first switch means, the relay switch 52S constitutes the second switch means, and the relay switch 53S constitutes the third switch means.

Although deicing has been described above, deicing can be similarly configured.

G. Effect of the Invention As described above, according to the present invention, when the windshield is heated for deicing and anti-icing, the driver's seat is divided into the driver's seat and the passenger's seat by using the heating element. Since it was heated from the side, the visibility of the driver's seat was secured earlier than before,
Safety confirmation before running can be performed while the passenger side is heating, improving usability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a vehicle windshield heating apparatus in an embodiment of the present invention, FIGS. 2 (a) to 2 (g) are time charts for explaining the operation, and FIG. FIG. 1 is an overall configuration diagram showing another example of a vehicle windshield heating device. 11A: Driver side heating resistance element 11B: Passenger side heating resistance element 21: Generator 22: Voltage regulator 31,32: Relay 31S, 32S _-1 , 32S _-2 : Relay switch 31C, 32C: Relay coil 41: Battery 42: Control circuit 43: Command switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomotaka Kurozu 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (56) References: 61-122144 (JP, U) (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A heating device for a vehicle windshield used in a vehicle, wherein the output of a generator for generating power by rotating an engine is guided to a voltage regulator, and the heating device for a vehicle windshield is used in a vehicle. A driver-side heat-generating resistor element disposed on the seat side, a passenger-side heat-generating resistor element disposed on the passenger seat side of the windshield, and the energization to the driver-side and passenger-side heat-generating resistor elements A command switch for commanding, a first state in which the voltage regulator is connected to the generator,
A first switch means that is in a second state in which the voltage regulator is disconnected from the generator and is connected to a battery; and the first switch means is inserted between the generator and the driver seat side heating resistance element to electrically connect both. Second switch means for connecting / disconnecting, third switch means inserted between the generator and the passenger seat side heating resistance element for electrically separating / connecting both, and the first switch by turning on the command switch. While the switch means is in the second state, the second switch means is closed and the third switch means is opened, and the second time is reached when a predetermined time has elapsed after the command switch was turned on.
The switch means for opening the third switch means and the third switch means are closed, and when a predetermined time has elapsed thereafter, the first switch means is brought into the first state and the third switch means is opened. A heating device for a vehicle windshield, comprising: a control means.