JPS6231549A - Washer interlocking type wiper drive device - Google Patents

Abstract

PURPOSE:To prevent the field of vision being poor due to washer liquid in a washer interlocking type wiper device, by enabling a wiper to be driven at a high speed when a washer switch is closed. CONSTITUTION:When a washer switch 4 is closed, a washer motor 5 is energized by a power fed from a battery 3 so that washer liquid is jetted onto a window glass pane, and capacitors 20a, 21a are initiated to be charged in first and second switch means 20a, 21a. Since the first and second switch means 20a, 21a have different time-constants for charging, respectively, a second switch 21 is energized prior to a first switch so that the set speed of a wiper motor is changed over into a high speed range from a low speed range. Thereafter, the first switch 20 is energized to drive the motor 6 at a high speed by means of a relay 8.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a washer-linked wiper drive device, that is, a wiper drive device configured to operate a wiper in conjunction with a washer switch.

(Prior art) Automobiles are generally constructed so that when the wiper switch is turned on, the wiper swings periodically on the windshield, such as the front windshield. A washer-linked wiper drive device that operates the wiper in conjunction with the washer may be provided. For example, JP-A-57-
There is a technology published in Publication No. 7739. this is,
As shown in FIG. 4, the circuit includes a wiper motor A for driving the wiper, a washer motor B for jetting washer fluid, a relay C for driving the wiper motor, and an intermittent fJ1 generation circuit for intermittently operating the wiper. , capacitor E
1 and resistance E2. It has a configuration in which a washer interlocking circuit E consisting of E3 or the like is added, and operates as follows.

That is, when the intermittent switch D1 in the intermittent operation circuit is closed, the transistor D3 is made conductive by the charge of the capacitor D2, thereby turning on the relay C, and as a result, the wiper motor A is driven until the capacitor D2 has no charge. Then, the wiper remains in a stopped state until the capacitor D2 is charged again. On the other hand, when washer switch F is closed, washer motor B operates,
At the same time as the washer fluid is sprayed onto the front window, charging of the capacitor E1 in the washer interlocking circuit E is started. Then, when the washer switch F is opened, the charge in the capacitor E1 is discharged, and as a result, the relay C is energized and the wiper motor A is operated.

According to such a configuration, the wiper automatically operates after a predetermined delay after spraying the washer liquid onto the windshield, etc., so that the wiper is oscillated on the dry windshield. This will prevent scratches on the surface and overload on the wiper motor A.

However, in the conventional wiper drive device as described above, when the wiper is operated in conjunction with the wiper operation, the washer fluid is sprayed at a relatively low speed (in other words, the wiper has two types of wipers: low speed and high speed). Generally, the wiper is configured to move at a low speed (of the operating speeds), so when the wiper is operated in conjunction with the operation, the washer fluid is sprayed as described above during high-speed driving. There was a problem in that the wiping operation for the washer liquid was delayed, and it took a corresponding amount of time to secure the forward visibility. In addition, J3 is added to the conventional circuit configuration as described above.
It is also possible to set the operating speed of the wiper at high speed when the washer is interlocked, but in this case, the wiper will operate at high speed even when the wiper is intermittently operating due to the intermittent operation circuit described above. As a result, a problem arises in that the product's marketability is significantly impaired.

(Object of the Invention) The present invention is intended to address the above-mentioned situation in the conventional washer-linked wiper drive device, and is capable of driving the wiper at high speed when the washer switch is closed. By realizing a washer-linked wiper drive device that drives the wiper at low speed when the wiper is set at the low speed position or when the wiper is intermittently operating, the spraying of washer fluid is controlled by the wiper during dry wiping operation. The purpose is not only to prevent such problems, but also to quickly ensure forward visibility especially immediately after spraying washer fluid when an automobile equipped with this type of wiper drive device is running at high speed.

(Structure of the Invention) In order to achieve the above object, the washer movement type wiper drive device according to the present invention is characterized by having the following structure.

That is, a first switch means is provided in parallel with the wiper switch to operate the wiper motor, a second switch means is provided in parallel with the wiper motor rotational speed changeover switch to change the rotational speed of the wiper motor, and a second switch means is provided in parallel with the wiper motor rotational speed changeover switch to operate the wiper motor. and a washer switch to enable the above-mentioned 1. The second switch means is activated by opening and closing the washer switch. In that case, after the washer switch is opened, the first switch means is activated at the same time as or after the second switch means is activated, and after the washer switch is opened, the second switch means is activated before or at the same time as the second switch means is activated. The time until the start of the operation of each of the above-mentioned switch means and the time until the end of the operation are respectively set so that the operation of the first switch means is completed. Here, these time settings are performed by appropriately selecting the capacitance or value of, for example, a capacitor or a resistor constituting each of the switch means.

(Effects of the Invention) According to the above configuration, when the washer switch is opened, the second switch means is activated to switch the set rotational speed of the wiper motor from low speed (low) to high speed (high), and then , or at the same time, the first switch means is activated to start rotating the wiper motor. As a result, the spraying of washer fluid is linked to the operation, and when the wiper swings, the wiper is driven at high speed.As a result, when spraying washer fluid onto the front window, especially when driving at high speed, The visibility ahead is quickly secured. Also, when the washer switch is turned off,
First, the rotation of the wiper motor is stopped by the termination of the operation of the first switch means, and then or at the same time, the set rotational speed of the wiper motor is automatically reduced to a low speed state by the termination of the operation of the second switch means. It will be switched to. As a result, even if the washer switch is turned on when the wiper is in an intermittent operating state or a low-speed driving state, the wiper will be driven at high speed for a predetermined period of time as described above, and then driven at low speed again. .

(Example) Examples of the present invention will be described below.

FIG. 1 shows a circuit configuration of a washer-linked wiper drive device according to this embodiment. As shown in the figure, the wiper drive device 1 has one end connected to a battery 3 via an ignition switch 2, and A washer motor 5 for injecting washer liquid whose other end is connected to ground via a washer switch 4, a wiper motor 6 for driving a wiper whose one end is also connected to a battery 3 via an ignition switch 2, and a wiper switch 7. A first relay 8 for driving the wiper motor is activated when the switch is closed to operate the wiper motor 6, and a first relay 8 for driving the wiper motor is activated when the high/low selector switch 9 is opened to change the set rotational speed of the wiper motor 6 to low (
It has a second relay 10 for low/high switching that switches between low speed rotation state) and high speed (high speed rotation state).

The first relay 8 has a first contact 8a on the non-conducting side and a first contact 8a on the conducting side (
The second relay 10 has a first contact 10a connected to the low speed rotation terminal 6a of the wiper motor 6, and a first contact 10a connected to the high speed rotation terminal 6b of the wiper motor 6. and a second contact 10b. and,
When the wiper switch 7 is opened, the first relay 8 is operated from the state shown in the figure (assuming that the ignition switch 2 is turned on), and its second contact 8b is closed, and accordingly, the battery 3 to wiper motor 6
The current supplied to the low speed rotation terminal 6a, the first contact 10a of the second relay 10, and the second contact 8 of the first relay 8
By flowing to the ground side via b, the wiper motor 6 is driven to rotate at a low speed. Also,
When the changeover switch 9 is turned on from this state, the second relay 10 is activated, and the second contact 10b of the relay 10 connected to the high-speed rotation terminal 6b of the wiper motor 6 is closed (the first contact 10a is opened), thereby switching the rotational speed of the wiper motor 6 from low speed to high speed.

The wiper drive device 1 is also equipped with an intermittent operation circuit that operates the wiper (not shown) intermittently when the intermittent switch 11 is opened.

This intermittent operation circuit forms a 111 circuit together with a first transistor 12 that controls the current flowing to the first relay 8, a second transistor 13 that controls on/off of the first transistor 12, and the second transistor 13. It has a capacitor 14, resistors 15 to 17, and a variable resistor 18. An auto-stop switch 19, which switches between a contact 19a on the ignition switch 2 side and a contact 19b on the ground side in conjunction with the wiper, is connected to the intermittent operation circuit and operates as follows.

That is, when the intermittent switch 11 is turned on, the first transistor 12 is turned on, and accordingly, the first relay 8 is turned on.
is activated and its first contact 8b is tapped,
As described above, the wiper motor 6 rotates at a low speed and swings the wiper at a low speed as well. At this time, as the wiper swings, the ground contact 19b of the auto-stop switch 19 is closed, and the current from the battery 3 is passed through the capacitor 14 in the intermittent operation circuit, the contact 19b of the switch 19, etc. The capacitor 14 is charged by the current flowing to the ground side. And the capacitor 1
When the charging port 4 reaches a predetermined value, the second transistor 13 is turned on due to the potential difference, and the first transistor 12 is turned off accordingly, so that the first relay 8 returns to its second contact point. 8a is closed. In that case, from the battery 3 to the wiper motor 6, each relay 10.
The swinging of the wiper continues as the flow M flows to the ground side through the first contacts 10a, 8a of the auto-stop switch 19 and the contact 19b of the auto-stop switch 19. In this way, the wiper swings to a predetermined position. In conjunction with this, the ground side contact 19b of the auto stop switch 19 is opened and the ignition switch side contact 19a is idled, and as a result, no current flows to the wiper motor 6 and the wiper is at the predetermined position. will be stopped.

From this state, the discharge of the E capacitor 14 is started, and when the discharge level reaches a predetermined value, the second transistor 13 is turned off, and the first transistor 12 is turned on. When the first contact 8b of the first relay 8 is closed, the wiper motor 6, that is, the wiper, is oscillated again. In this embodiment, the time interval of the intermittent operation of the wiper, that is, the discharge time constant of the capacitor 14 is controlled by the variable resistor 18.
It is configured so that it can be adjusted by

However, this wiper drive device 1 includes a first switch means 20 that is provided in parallel with the wiper switch 7 and operates the wiper motor 6 via the first relay 8 similarly to the switch 7, and the changeover switch 9. A second switch is provided in parallel and switches the set rotational speed of the wiper motor 6 between low and high through a second relay 10 similar to the switch 9.
A switch means 21 is provided. These switch means 20.21 are each a capacitor 20a.

21a and resistors 20b, 20c, 21b, and 21c, and is activated when the washer switch 4 is opened. In the first switch means 20, charging of the capacitor 20a is started when the washer switch 4 is opened, and when the potential difference becomes a predetermined value or more, the first transistor 12 is turned on and the first relay 8 is turned on. When the washer switch 4 is opened and the capacitor 20a is discharged through the resistor 20c to reach a potential difference below a predetermined value, the first transistor 12 is turned off and the first relay 8 is reset. It looks like this. Further, in the second switch means 21, when the washer switch 4 is closed, the capacitor 21
When a is charged and its potential difference exceeds a predetermined value,
The third transistor 22 connected to the second relay 10 is turned on to start the relay 10, and conversely, when the washer switch 4 is opened, the capacitor 21a is connected to the resistor 21C.
When the potential difference becomes equal to or less than a predetermined value by discharging through the terminal, the third transistor 22 is turned off and the second relay 10 is reset. In that case, as shown in FIG. 2, the charging time constant T1 of the first switch means 20 is set to be equal to or larger than the charging time constant T2 of the second switch means 21 (T+≧T2), and The discharge time constant aT1' of the first switch means 20 is the same as that of the second switch means 2.
It is set to be equal to or smaller than the discharge time constant T2' of 1 (T1'≦T2'). That is, after the washer switch 4 is opened, the second switch means 21 is activated, the first switch means 20 is activated at t:m<or at the same time, and after the washer switch 4 is opened, the second switch means 21 is activated. said capacitor 20 in each switch means 20.21 so that the operation of the first switch means 20 is terminated before (or at the same time)
a, 21a and resistors 20b, 20c, 21b, 2
A capacity or value of 1c is set.

According to such a configuration, when the washer switch 4 is closed, the washer motor 5 is operated by power supplied from the battery 3, and the washer fluid is sprayed onto the windshield. In the second switch means 20.21, charging of the capacitors 20a and 21a is started, respectively. In that case, the charging speed of each capacitor 20a, 21a, that is, the charging time constant T1. Due to the difference in T2, the second switch means 21 is activated at the same time as the first switch means 20 is activated, and first the wiper motor 6 is activated via the second relay 10.
The set rotational speed of is switched from the low state shown in the figure to the high state (the state in which the second contact 10b of the second relay 10 is closed), and then the first switch means 20 is operated, so that the first relay Via 8 the motor 6 is operated at high speed.

As a result, the wiper, which is driven by the operation of the washer fluid, is driven by the wiper motor 6 at high speed (
(in the high state) will be rocked.

Further, after swinging the wiper in this manner, when the washer switch 4 is opened, the capacitors 20a and 21a in each switch means 20 and 21 are discharged, and the operation of each switch means 20 and 21 is accordingly stopped. However, in that case, the first switch means 20
After the operation of the second switch means 21 stops, the second switch means 21 stops operating. Therefore, after the washer switch 4 is opened, contrary to the case immediately after the switch 4 is opened, the rotational speed of the wiper motor 6 is stopped via the first relay 8, and then the rotation speed is set by the second relay. 10, the high speed state described above is switched back to the low speed (low) state.

However, in J3 having the above-described configuration, the operation control of the wiper motor 6 linked to the operation and the switching control of the rotation speed of the wiper motor 6 are controlled by the wiper switch 7.
Since this is performed by the first and second switch means 20 and 21, which are respectively provided in parallel with the changeover switch 9, even when the wiper switch 7 is opened, the intermittent switch 11 is closed, or when the rewiper is driven at low speed. When the washer switch 4 is opened and closed, the wiper is swung at high speed for a predetermined period of time in conjunction with the opening and closing of the washer switch 4 in the same manner as described above. As a result, when the washer fluid is sprayed onto the windshield during high-speed driving, visibility in front of the J3 is quickly secured, and
This type of washer-linked wiper drive device 1 avoids a situation where the wiper, which is temporarily driven in conjunction with the washer, continues to operate at high speed even after returning to its original intermittent operation state or low-speed drive state. This will result in improved performance.

In the above embodiment, the first. Although the second switch means 20 and 21 are provided with capacitors 20a, 21a, etc., respectively, this kind of switch means has a circuit structure such as the washer-linked wiper drive device 1' of the second embodiment shown in FIG. You can also use it as That is, in this second embodiment, a capacitor 23' and resistors 24' and 25' constitute a first switch means 20' similar to that in the first embodiment, and the capacitor 23' and resistors 24'
, 26' constitute a second switch means 21', and the other washer switches 4, washer motor 5, wiper motor 6, wiper switch 7, first relay 8, low/high changeover switch 9, second relay 10, etc. (that is, those shown in FIG. 3 with the same reference numerals as in FIG. 1) are constructed in the same manner as in the first embodiment. This circuit configuration also operates in the same manner as the first embodiment, but in that case, in addition to the above effects, the capacitor 23
Since the switch means 20 and 24' are shared by each switch means 20 and 21', the number of circuit elements is reduced compared to the first embodiment, thereby simplifying the circuit configuration and reducing costs. It has its advantages.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a washer-linked wiper drive device showing a first embodiment of the present invention, and FIG. 2 shows a washer switch and a first wiper drive device connected to the washer. A time chart diagram showing each operation timing of the second switch means, and FIG. 3 is a circuit diagram of a washer-linked wiper drive device according to a second embodiment. Further, FIG. 4 is a circuit diagram showing a conventional example. 1.1'...Washer interlocking type wiper drive device, 4.
... washer switch, 5... washer motor,
6... wiper motor, 7... wiper switch, 9...
...Low/high selector switch, 20.20'...1st
Switch means, 21.21'... second switch means. Figure 2 Figure 4

Claims (1)

[Claims] (1) A first switch means that is provided in parallel with the wiper switch to operate the wiper motor, a second switch means that is provided in parallel with the wiper motor rotational speed changeover switch that switches the rotational speed of the wiper motor, and a washer motor. and a washer switch to be activated, wherein the first and second switch means are activated by opening and closing the washer switch, and after the washer switch is closed, the first switch means is activated at the same time as or after the second switch means is activated. When the switch means is activated, after the washer switch is opened, the time elapses from the start of the operation of each switch means such that the operation of the first switch means ends before or simultaneously with the end of the operation of the second switch means. A washer motion type wiper drive device, characterized in that a time period until the end of the operation and a time period until the end of the operation are set respectively.