JPH081987Y2 - Vehicle window heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a heating device for heating a vehicle window to remove frost, snow, and the like.

<Prior Art> As a conventional example of this type of heating device, there is one as shown in FIG. 6 (see Japanese Patent Publication No. 61-33735).

That is, metal particles are vapor-deposited in a window glass (not shown) such as a windshield to provide an electric resistor 1 for heating, and the electric resistor 1 is energized to heat the window glass. Ice such as frost and snow attached to the window glass is melted.

Specifically, the contact 3a of the control relay 3 is switched by the excitation signal from the control unit 4 when the ice-melting operation switch 2 is off or after 5 minutes have passed since it was turned on, and the output part 6 of the alternator 5 and the battery 7 rated 12V. And other electrical loads (lights, etc.). Then, the voltage regulator 8 controls the exciting current applied to the rotor coil 5a of the alternator 5 based on the output voltage (generated voltage) of the output unit 6 of the alternator 5, so that the battery voltage is 1
When the voltage is 2.5 V or less, normal voltage control is performed to control the output voltage of the stator coil 5b of the alternator 5 to be 13.5 V, for example. The voltage regulator 8 includes a control unit 4
An exciting current is supplied from the battery 7 via the ignition switch 9.

Within 5 minutes after the ice-melting operation switch 2 is turned on, the conduction voltage control is stopped and the ice-melting operation is performed unless the operation switch 2 is turned off.

That is, when the shift position sensor 10 detects that the shift position of the transmission is in the neutral position (including the parking position), that is, when the vehicle is stopped, the control unit 4 stops the power generation of the alternator 5 and then detects the voltage. The electronic fuel control device 12 is controlled so that the output voltage of the alternator 5 is boosted to 60V based on the detection voltage of the resistor 11. The electronic fuel control device 12 controls the amount of fuel supplied to the engine, and increases the engine speed to alter the alternator 5
The output voltage of the electric resistor 1 can be increased to cope with the power consumption of the electric resistor 1.

The control unit 4 switches the contact 3a of the control relay 3 to connect the output 6 of the alternator 5 and the electric resistor 1. Then, the maximum exciting current is passed through the rotor coil 5a to start power generation during the ice melting operation.

In this way, the electric resistance 1 is heated by energizing the electric resistance 1 to melt ice such as frost and snow adhering to the window glass.

Reference numeral 13 is an ignition relay that supplies a power supply voltage to the control unit 4, 14 is an ice melting operation indicator light, and 15 is a charge lamp that indicates whether or not the alternator 5 is generating power.

<Problems to be Solved by the Invention> By the way, during the normal voltage control, the output voltage of the alternator 5 is set to about 14.4 V and 5000 r.pm at the time of cooling when the rotation speed of the alternator 5 is 5000 r.pm.
The output voltage of the alternator 5 is about 13.5 when warming up.
It is set to V (see Figure 7).

When applied to an electric load such as a battery, as shown in FIG. 7, it has a characteristic that the voltage drops with an increase in output current due to the electric load. Where the battery 7
Is almost completely charged, the terminal voltage of the battery 7 also has the same characteristics as in FIG.

However, when the battery 7 is deteriorated (for example, due to a decrease in the specific gravity of the electrolytic solution, a shortage of the electrolytic solution, deterioration of the electrode plate, etc.), the terminal voltage of the battery 7 is lower than usual. Therefore, the terminal voltage of the battery 7 is equal to that of the alternator 5.
The output voltage of the battery 7 does not become the same, and even if those voltages become the same at the time of charging, when the charging is stopped and the discharge from the battery 7 to the electric load is started, the terminal voltage of the battery 7 sharply drops, There are the following defects.

That is, when the contact 3a of the control relay 3 is switched to apply the output voltage of the alternator 5 to the electric resistor 1, the terminal voltage of the battery 7 is applied to an electric load such as a light. However, there is a problem that the applied voltage of the electric load changes abruptly and, for example, in the case of a light, the brightness changes abruptly (hereinafter, referred to as flicker).

The present invention has been made in view of such a situation,
An object of the present invention is to provide a heating device for a vehicle window capable of suppressing a rapid voltage change when a voltage is applied from a battery to an electric load even if the terminal voltage of the battery is lower than usual due to deterioration or the like.

<Means for Solving the Problems> Therefore, the present invention selectively attaches a heating element mounted on a vehicle window for heating the window, an electric load other than the heating element, and a battery to a power supply voltage circuit. In the one that is switched and energized, and the electric load is energized from the battery when the heating element is energized, the voltage applied to the electric load immediately after the voltage is switched to the electric load is output from the battery. A voltage changing unit that gradually changes with time so that the voltage becomes a voltage is provided.

<Operation> In this way, the voltage applied to the electric load is gradually made to approach the output voltage of the battery with time immediately after the switching, so that the rapid voltage change immediately after the switching is suppressed.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.
In the following examples, the same elements as those of the conventional example have the sixth feature.
The same reference numerals as in the figure are given and the description thereof is omitted.

 FIG. 1 shows a first embodiment of the present invention.

In the figure, a headlamp 21 as an electric load is manufactured in parallel with the battery 7, and a delay circuit 22 as a voltage changing means is interposed between the headlamp 21 and the + side terminal of the battery 7. . This delay circuit 22
Has a predetermined time constant, and when a predetermined voltage is applied from the battery 7, the output voltage is gradually changed with the passage of time so as to reach the predetermined voltage at the initial application, and then the predetermined voltage is applied. It is designed to hold.

Here, the control unit 4 is designed to perform the same operation as the conventional example.

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

During normal voltage control, the output voltage of the alternator 5 via the power supply voltage circuit is approximately 14.4 V when cold and approximately 13.4 when warm.
The voltage is controlled to be 5V, and this voltage is applied to the battery 7 and the headlamp 21 via the control relay 3.

When the ice-melting operation switch 2 is turned on while the vehicle is stopped, the control unit 4 stops the alternator 5 from generating power and then connects the contact 3a of the control relay 3 to the alternator 5
The output control unit 6 and the electric resistor 1 as the heating element are switched and controlled. Then, the control unit 4 controls the electronic fuel control device 12 to increase the engine speed, and then starts voltage control so that the output voltage of the alternator 5 becomes 60 V as shown in FIG.

As a result, as shown in FIG.
Is applied to heat the electric resistor 1 to melt ice such as frost and snow attached to the window glass.

On the other hand, a voltage (predetermined voltage) of about 13.5 V is applied from the battery 7 to the headlamp 21 via the delay circuit 22 by the switching control of the control relay 3. At this time, the delay circuit 22 controls the output voltage so that it gradually changes from 14.4 V to 13.5 V with time as shown in FIG.

Therefore, immediately after the switching, even if the terminal voltage of the battery 7 is lower than the output voltage of the alternator 5 due to internal resistance or deterioration of the battery 7, the voltage applied to the headlamp 21 gradually changes and the voltage of the battery 7 changes. Since it becomes the terminal voltage, it is possible to suppress a sudden voltage change, and thus to suppress the flicker of the headlamp 21.

 FIG. 3 shows a second embodiment of the present invention.

In this embodiment, in addition to the structure of the first embodiment, a second delay circuit is provided between the control relay 3 and the electric resistor 1.
It is connected via 23. This second delay circuit 23
Has the same function as the delay circuit 22.

With this configuration, immediately after the control relay 3 is switched, the voltage applied to the headlamp 21 is maintained at 13.5V after gradually falling with time as shown in FIG. 4 as in the first embodiment. The same effect as the first embodiment is obtained. Further, the voltage applied to the electric resistor 1 by the second delay circuit 23 gradually increases with time and is maintained at 60 V as shown in FIG. Since the current is suppressed, it is possible to suppress the change in the driving torque of the alternator 5 at the initial stage of energization, and thus to suppress the influence on the engine and improve the riding comfort.

 FIG. 5 shows a third embodiment of the present invention.

In the figure, a battery 7 and a head lamp (not shown)
And are connected via a delay (not shown) similar to that of the first embodiment. The battery 7 and the small lamp 31 are connected via a contact 32a of the first energization relay 32. Further, the battery 7 and the heat wire resistance 33 of the liner glass are connected via the contact 34 a of the second energization relay 34. The coils 32a and 34b of the first and second energization relays 32 and 34 are energized and controlled by the control unit 35 to be opened and closed.

Here, in the small lamp 31 and the heat ray resistance 33,
The battery 7 is energized regardless of whether or not the electric resistor 1 is energized. The control unit 35 also controls the small lamp 31 when the electric resistor 1 is energized.
Etc., the current consumption of the electric load and the terminal voltage of the battery 7 are detected, the capacity of the battery 7 is compared with the consumption current of each electric load, and the voltage from the battery 7 to each electric load is considered in consideration of the consumption of the battery 7. To determine if it can be put in.

Then, the control unit 35 stops the energization from the battery 7 in consideration of the consumption of the battery 7 from the electric load having the highest priority. When the priorities of the electric loads are listed in order from the highest priority to the lowest priority, the wiper,
The heat wire resistance 33, a blower motor, an illumination lamp for instruments, a small lamp 31, and the like are included. Here, the priority of the small lamp 31 is made the lowest so that other vehicles can be informed of the position of the own vehicle for safety at night.Next, the priority of the illumination lamp is made lower at night. This is for improving the visibility and operability for the driver at the time.

According to such a configuration, since a voltage is applied from the battery 7 to the headlamp through the delay circuit when the alternator 5 is energized to the electric resistor 1, it is possible to suppress a rapid voltage change as in the first embodiment. The same effect as the first embodiment is obtained.

Further, when electricity is applied from the alternator 5 to the electric resistor 1, electricity is applied from the battery 7 to the head lamp, the small lamp 31, the heat wire resistance 33, etc. Select in descending order of priority. For example, when the wiper and heat wire resistance 33 are selected, each energizing relay of the wiper and heat wire resistance 33 is selected.
The contact 34a of 34 is opened to forcibly stop the energization of the wiper and the heat wire resistance 33.

By doing so, even if the headlamp that consumes a large amount of current is energized from only the battery 7, the energization to the heat wire resistor 33 is stopped, so that the load on the battery 7 is reduced and the life of the battery 7 can be improved.

<Effects of the Invention> As described above, the present invention is configured so that the voltage applied to the electric load is gradually changed with time to approach the battery voltage immediately after the voltage is switched to the electric load.
It is possible to suppress abrupt voltage changes and suppress flickering of headlamps and the like.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a time chart of the same as above, FIG. 3 is a circuit diagram of a second embodiment of the present invention, FIG. FIG. 5 is a circuit diagram showing a third embodiment of the present invention, FIG. 6 is a circuit diagram showing a conventional example of a vehicle window heating device, and FIG. 7 is a characteristic diagram for explaining the operation of the same. 1 ... Electric resistor, 3 ... Control relay, 5 ...
Alternator, 7 ... Battery, 21 ... Headlamp,
22 ... delay circuit

Claims (1)

[Scope of utility model registration request] 1. A heating element mounted on a vehicle window for heating the window, an electric load other than the heating element, and a battery are selectively switched from a power supply voltage circuit to be energized to supply heat to the heating element. In a heating device for a vehicle window in which the battery is energized when energized, a voltage applied to the electric load immediately after voltage switching to the electric load is set to be an output voltage of the battery. A heating device for a vehicle window, characterized in that a voltage changing means for gradually changing with time is provided.