JPS6219915A - Wiper controller for vehicle - Google Patents

Abstract

PURPOSE:To prevent completely the troubles caused at an interlocking switch part by providing the 2nd switch means which breaks the contact of the interlocking switch at the power supply side through this power supply side when the interlocking switch opens an energizing circuit. CONSTITUTION:A wiper blade has a reciprocating motion with revolutions of a wiper motor 5. When the motor 5 reaches a prescribed position, a mobile contact 6a of a cam plate 60 is separated from a fixed contact 6c. In this instant, a power supply circuit is broken and the motor 5 is revolved by inertia up to a position, i.e., a stopping position where a mobile contact 6b is connected to the contact 6c and stopped there. While the energization is discontinued to a relay coil 8 as soon as the contact 6a is detached from the contact 6c. Thus, a relay contact 8a is detached from a relay contact 8c and the power supply circuit is cut off to the contact 6a of the plate 60. In such a way, both contacts 6c and 6a are never damaged even in such a case where the motor 5 has reverse revolutions and therefore the contact 6a is connected again to the contact 6c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle wiper control device for intermittently operating a vehicle wiper.

[Conventional technology]

In the conventional wiper control device, as shown in FIG. 4, a cam plate 60 that rotates in conjunction with the wiper motor 5 has a movable contact 6a connected to a power source and a movable contact 6b grounded.
The movable contacts 5a and 5b are connected to and connected to a fixed contact 6C connected to a motor power supply control circuit in conjunction with wiper operation.

That is, when the wiper is intermittently operating and the wiper is not at the stop position, the fixed contact 6c is connected to the movable contact 6a and is configured to energize the motor until the wiper reaches a predetermined stop position. ing.

However, in the conventional wiper, even if an obstacle such as snow adheres to the vicinity of the wiper blade during wiper operation, the wiper is stopped in front of a predetermined stop position, and the fixed contact 6C is movable with the insulating surface of the cam plate 6. When held at a position near the boundary with the contact 6a, the fixed contact 6C reciprocates between the insulating surface 60a and the movable contact 6a, and the movable contact 6a and the fixed contact 6C move back and forth between the insulating surface 60a and the movable contact 6a.
There was a fear that a spark discharge would occur between C and melt the movable contact 6a or the fixed contact.

The technical problem of the present invention is to quickly disconnect the movable contact from the power supply when the fixed contact separates from the movable contact in order to prevent the above-mentioned problem when the wiper stops at an abnormal position.

[Means for solving problems]

SUMMARY OF THE INVENTION In order to achieve the above technical problem, the present invention includes: a wiper driving motor; an intermittent signal generation circuit that generates an intermittent signal for intermittently operating the motor; It has a first switch means for closing an energizing circuit, a fixed contact and a movable contact, and the fixed contact and the movable contact switch in conjunction with the rotational position of the motor, and the intermittent signal disappears. an interlocking switch that keeps the energizing circuit in a closed state even after the motor reaches a predetermined stop position, and a power supply side contact of the interlocking switch is connected to the power supply side by generation of the intermittent signal. At the same time, a technical means is adopted in which a second switch means is provided for cutting off the power supply side contact of the interlocking switch from the power supply side when the interlocking switch opens the energizing circuit.

[Effect]

By adopting the above technical means, when the motor stops just before reaching a predetermined stop position, once the movable contact and the fixed contact of the interlocking switch are separated and the energizing circuit of the motor is opened, the second switch means Since the power supply side contacts of the interlocking switch are cut off from the power supply side, spark discharge does not occur even if the fixed contact and the movable contact are repeatedly connected and disconnected at the unstable stop position as described above.

〔Example〕

The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 shows an electric circuit according to a first embodiment of the present invention. In FIG. 1, numeral 3 indicates an on-vehicle battery, and an ignition switch 2 and a fuse 1 are connected to the battery 3. As shown in FIG. This fuse 1 is connected to a ferrite type wiper motor 5 for driving the wiper, and this wiper motor is driven at high speed (Hl).
, an operation switch 4 for selecting low speed (LO), and intermittent operation (INT), a control circuit 14 for intermittent operation, and a washer motor 15 are connected. The wiper motor 5 is provided with a high speed contact 5b and a low speed contact 5C, and each contact is connected to the terminal (+2) of the operation switch 4,
(+1). Note that each selection mode (OFF, INT, LOW, H) of the selection switch 4 shown in FIG.
The line segment connecting the white circles in l) is connected to each terminal (S, +
B, +1. +2°C, E, W).

Further, the cam plate 60, which rotates in conjunction with the rotation of the motor 5, is provided with movable contacts 6a and 6b constituting the interlocking switch 6 of the present invention, as shown in FIG.
The fixed contact 6c is connected to the control circuit 14.

The control circuit 14 includes an intermittent signal generation circuit 7, a transistor 10 that is turned on by an output signal from this circuit, and a contact 9c connected to a contact a while the transistor 10 is turned on.
a relay 9 (first switch means) connected to means)
It is equipped with

Next, the operation of the first embodiment of the present invention having the above configuration will be explained.

First, when the operating switch notch 4 is placed in the INT position as shown at time t0 in FIG. 2, the intermittent signal generating circuit 7 starts oscillating and outputs an intermittent signal as shown in FIG. 2 (b). This output turns on transistor 10, and relay coil 9
Since e is energized, relay contact 9C is connected to contact 9a. Therefore, power #3 is supplied to the wiper motor 5 through the relay 9 and the terminal (S) 7 (+1) of the wiper switch 4, and the wiper motor 5 starts rotating. At the same time, the relay contact 9C is connected to 9a, so that the power source 3 is connected to the terminal (S) of the relay 9 and wiper switch 4.

(+1) and is supplied to the coil 8e of the relay 8, the relay 8 is turned on, and the relay contacts 8a and 80 are connected.

Therefore, as shown in FIGS. 2(c) and 2(d), the movable contact 6a provided on the cam plate 60 has contacts 8a and 3c.
A power supply 3 is supplied through. Further, as the wiper motor 5 rotates at this time, the movable contact 6b provided on the cam plate 60 that is interlocked with this rotation separates from the fixed contact 6C, and the movable contact 6a is connected to the fixed contact 6C. Therefore, while the wiper motor 5 is rotating, that is, while the movable contact 6a and the fixed contact 6C are connected, the intermittent signal generated from the intermittent signal generating circuit 7 is generated at time 1. as shown in FIG. disappears, relay 9 turns off, i.e. contact 9
Even if C is separated from contact 9a and connected to contact 9b, power is supplied from power supply 3 to wiper motor 5 through the route relay contacts 8a-8C -> movable contact 6a - fixed contact 6C - relay contact 9b -> 9C -> wiper switch 4. , keep rotating. At the same time, the power supply 3 is supplied to the relay coil 8e through the same route, the relay 8 is turned on, and the continuation is cam play) 60
The power supply 3 continues to be supplied to the movable contact 6a.

The wiper blade (not shown) makes one reciprocation due to the rotation of the wiper motor 5, and at time t2 shown in FIG.
When reaches a predetermined position, the movable contact 6a of the cam plate 60 separates from the fixed contact 6C. At this moment, the power supply circuit is cut off, but the wiper motor 5 rotates due to inertia to a predetermined stop position where the movable contact 6b and the fixed contact 6C are connected and then stops. On the other hand, the movable contact 6
At the moment a separates from the fixed contact 6C, the energization to the relay coil 8 is also stopped, so the relay contacts 8a and 8c separate,
The power supply circuit to the movable contact 6a of the cam plate 60 is cut off.

Here, even if the wiper motor 5 causes reverse rotation or the like and the movable contact 6a of the cam plate 60 is connected to the fixed contact 6C again, the wiper motor 5 will rotate normally again because power is not supplied to the movable contact 6a. Therefore, the fixed contact 6C and the movable contact 6a of the cam plate 60 will not be damaged.

Further, in the first embodiment, when the operation switch 4 is switched to the low speed position LOW and the high speed position H1, the low speed contact 5C1 and the high speed contact 5b of the wiper motor 5 are directly connected to the power supply 3 via the fuse 1, respectively. Rotate slowly or quickly. In this case, the wiper motor 5 operates regardless of the relay 9, but the relay 8 operates in the same manner as in the above-described embodiment, and failures in the interlocking switch portion can be prevented.

That is, it is obvious from FIG. 1 that when the operation switch 4 is in the low speed position LOW, the relay coil 8e is energized, but when the operation switch 4 is in the high speed position HIO, the low speed terminal 5C
Since a voltage of about 15V is generated, the relay coil 8
e is energized.

Next, other embodiments of the present invention will be described. Figure 3 shows
A second embodiment of the present invention is shown, in which the same reference numerals as in FIG. 1 indicate the same configurations. In the second embodiment, the relay 8 is provided outside the wiper control circuit 14. The second embodiment also operates in the same manner as the first embodiment described above.

Further, the second switch means of the present invention is not limited to the relay 8 described above, and may be replaced with a semiconductor element such as a transistor.

〔Effect of the invention〕

As described above, according to the present invention, even if the motor does not stop at a predetermined stop position for some reason, the interlock switch that is linked to the rotation of the motor once cuts off the power to the motor. Since the power supply is cut off by the second switch means, failures in the interlocking switch portion can be reliably prevented and the reliability of the product can be improved.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing a first embodiment of the present invention, FIG. 2 is a waveform diagram of each part of FIG. 1, FIG. 3 is an electric circuit diagram showing a second embodiment of the present invention, and FIG. FIG. 3 is a plan view showing a specific example of the interlocking switch of the present invention. 2...Ignition switch, 3...Battery, 4
...Operation switch, 5...Wiper motor, 6...
Interlocking switch, 5a, 5b...Fixed contact, 6c...
Movable contacts. 7... Intermittent signal generation circuit, 8... Relay (second switch means), 9... Relay (first switch means)
. Representative Patent Attorney Takashi Okabe Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] A motor for driving a wiper, an intermittent signal generating circuit that generates an intermittent signal for intermittently operating the motor, and a first circuit that closes a current supply circuit to the motor by generating the intermittent signal. and a fixed contact and a movable contact, the fixed contact and the movable contact switching in conjunction with the rotational position of the motor, so that the motor remains at a predetermined stop position even after the intermittent signal disappears. an interlocking switch that keeps the current-carrying circuit in a closed state until just before the current-carrying circuit; A wiper control device for a vehicle, comprising: second switch means for cutting off a power source side contact of the interlocking switch from the power source side when opened.