JPS58112851A - Method and device for wiping window surface - Google Patents

Abstract

PURPOSE:To obtain quiet oscillating movement for wiping by stopping a wiping blade for a certain while at the time of reversal of the movement. CONSTITUTION:When a reversing position cam 220 turns in a half-circle, that is, at a reversing point of a wiper blade from a going stroke to a returning stroke, a cam contact is switched over from H3 to H2 to connect a wiper motor terminal H to an earthing terminal E, and motor current is disconnected to brake and stop a drive motor 201. After a while, when the discharged current of a condenser C1 is lowered under the value of the base current to turn on a transistor Tr1, the transistor Tr1 is turned off, while a transistor Tr2 is on to actuate the wiper motor again, and this process is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and a device for wiping a windshield made of glass, etc., and particularly to a method and a device for wiping a windshield (hereinafter referred to as a wiper device) for securing visibility in automobiles, etc. ) regarding.

Conventionally, the structure of a known wiper device is such that a wiper blade, which is placed in contact with the windshield to ensure a wiped surface of the windshield, is latched to the rotating shaft of the motor via a link mechanism to swing the wiper blade. The crank arm drives the wiper blade. Furthermore, an auto-stop cam circuit is installed in the motor device (wiper motor) so that the wiper blade always stops at a fixed position on the windshield, and at the same time performs a suitable wiping operation depending on the amount of raindrops adhering to the windshield surface. Therefore, the system has a wiping mode changeover switch (wiper switch) and a control circuit (wiper control relay).

Once the driver detects rain and turns on the wiper switch, the 7 mechanism generates a sinusoidal oscillation of the wiper blade for the uniform rotation of the drive motor of the wiper motor, that is, for the uniform rotation of the crank arm. In order to convert this into dynamic motion, the wiper blade on the windshield surface swings and wipes with a sinusoidal speed characteristic, ensuring visibility. and.

Even if the switch is turned off in the middle of wiping, the wiper blade continues wiping due to the action of the auto-stop cam circuit, and only stops wiping when it reaches a predetermined stop position.

However, in conventional wiper devices, the main parts such as the wiper blade and the link mechanism repeatedly oscillate with sinusoidal speed characteristics, so when reversing from the forward stroke to the backward stroke and from the backward stroke to the forward stroke, excessive This is accompanied by a change in acceleration, and since the time of this reversal coincides with the dead center of the crank arm, the wiper blade is affected by the influence of inertia, etc.

This has the problem of inducing impact vibrations related to the clearances of various parts of the link mechanism and the rigidity of the vehicle body, generating so-called reversal noise, impairing driving comfort and safety, and at the same time impairing the durability of the wiper device.

In conventional wiper devices, an auto-stop cam circuit is used to control the wiping operation of the wiper blade at any time when the force is reversed from the forward stroke to the backward stroke or from the first backward stroke to the forward stroke. Please pause Kl! There is something that has been achieved. In this case, an excessive change in acceleration can be prevented, but an excessive change in acceleration still occurs during the other reversal, so the above-mentioned problem still occurs in the wiper device having such a configuration.

The present invention solves the above problems.

The purpose is to provide a method for wiping a window surface that allows a quiet swinging wiping motion and is excellent in driving comfort and safety, and an apparatus for carrying out the method.

Next, the present invention will be explained with reference to the drawings. FIG. 1 shows a wiper device 11' according to a first embodiment of the present invention. ! 1- As shown in C, the wiper device is...

Wiper movable part 100. Wiper motor 200. Wiper switch 300. Wiper control relay 400 consists of four main components. Mazu.

The wiper movable part 100 is similar to a conventionally known wiper device, and the rotational movement of the crank arm 101 is controlled by y/*11f.
102t-viarefv-Fl 03F)a It is configured to convert into a double wiping operation. The crank arm 101 is fixed to the rotation shaft of the drive motor 201 of the wiper motor 200, and at the same time, the auto stop cam 210 and the reversing position device cam 220 are also fixed to the rotation shaft of the drive motor 201, so that they rotate uniformly according to the rotation of the drive motor. It is composed of And auto stop cam 21o
As the terminals rotate uniformly, the illustrated terminal SL moves away from contact point 8, and moves to contact point 83.
(contact point) until the cam 210 makes one rotation (360 degrees) when it comes into contact with s5 and continues to make one full rotation w
KK contact us again) & India 8. come into contact with. Similarly 1
As the reversal position cam 220 rotates uniformly, the illustrated terminal H1 moves away from the contact point H snow and comes into contact with the contact point H field.

The cam 220 continues to be in contact with one contact point H5 until it makes a half turn (180 degrees), and just after half a turn, it comes into contact with the contact point H11 again. In other words, for one rotation of the drive motor 201, that is, the crank arm 101,
The terminal 81 of the auto stop cam 210 is connected once, and the terminal H1 of the reverse position cam 220 is connected twice to the ground terminal 1! It has a structure that allows conduction to occur. Wiper switch 30 (HX as shown), not only ON and OFF switching, but also wiping mode f Lo (low FF1) when ON,
Hl (ai!IN)K is configured to be switchable independently, electrical conduction follows the illustrated circle connection MK, and each mode is electrically independent from each other. The wiper control relay 400 is a control device that controls electrical conduction and stopping of the drive motor 201 for an appropriate period of time at the reciprocating and reversing position of the wiper blade 103 by the signal generated by the reversing position cam 220. It has a known configuration, and a vehicle battery 5oo supplies power to the wiper device through an ignition switch 501 and a fuse 502 with connections as shown.

Next, the operation will be explained. In the case shown in FIG. 11!1, the blade 103 is in a predetermined stopping position. Therefore, the reciprocating swing wiping operation of the wiper relay r103 is started from the state of the reverse position cam 210 as shown in the figure.

That is, the illustrated position of the cam 21G is wiper delay Y.
Indicates the reversal position from the backward stroke to the forward stroke.

When the ignition switch 501 is ON and the wiper switch 300 is LO, wiper control IJL/-4
The ground terminal 11 of 00 is C-B of the wiper switch 300
Since it is grounded through the DM wire, the current flows from battery → fuse → terminal 13 → R4 → Tr, → terminal 1
1 → wiper switch (C → 11 pieces) → ground, transistor Trll is turned on, and the current is Kameko i 3-
+ L - + D4-) TT arm → A magnetic force is generated between the terminal 11 and the flow coil I, and the point) PH is connected to the contact point P. Therefore, the current is 13 → P, → P, → terminal 12 → wiper switch (H
→+1)→wiper motor (+1→M→E) and the flow drive motor 201 rotate uniformly. +1 of wiper motor 200
The terminal is a low speed terminal and the +2 terminal is a high speed terminal. At the same time as the motor starts rotating, the cam contact is switched from H2 to H5K by the reversing position cam 220, so that the capacitor CI is connected from the battery to the connection point to the wiper motor (B-+H3).
→H1→H)-+ terminal 14 →D2→R11(4-+
Charging power is started by the current flowing from 'rrl to terminal 11. As the capacitor C1 is charged, the potential at point f increases, for example, when it rises to the battery potential, the transistor Tr□ is turned on, so the transistor Tr is turned off, and no current flows through the coil B (because the attractive force a disappears, Point P8 is connected to contact point P.However, the connection to drive motor 201 is from battery to wiper motor (Hl +H3 to H1-+n).
A current flows through the circuit → terminal 14 → P1 → Prs → terminal 12 → wiper switch (H → +1) → wiper motor (+1 → M-+B), and the drive motor 201 continues to rotate.

When the reversal position cam 220 rotates half a rotation.

That is, in the reversal position of the wiper blade from the forward stroke to the backward stroke, the cam contact switches from Hl to Hl, and as a result, the terminal 11 of the wiper motor is connected to the ground terminal E (no motor current is supplied), and the drive motor 201 stops due to braking. At this time, the base current of the transistor Trl is no longer applied, but the right II of the capacitor ?C (that is, f
Discharge begins from point ) through resistor R1, and during discharge, transistor l1lr1 is ON, so 71
It becomes zoyν.

Drive motor 201 remains stopped. After a while, the discharge current of capacitor C4 is turned off.
When the base current becomes lower than the value to turn on, the transistor 'r
rl&engineering) The tunister Try is turned ON and the wiper motor starts moving again, repeating the above operation.

FIG. 2 shows the wiping operation characteristics of the wiper blade 103 controlled by the wiper control relay 400, with the vertical axis representing speed and the horizontal axis representing time. In Fig. 2, -) is the characteristic at low speed. If the speed in the forward stroke of the wiper blade 103 is taken as a normal speed, the section -) in Fig. 2 is the characteristic at low speed.
-1 is the forward wiping stroke, the speed changes like a sine wave, and 1
Point 1 is the reversal position from the forward stroke to the backward stroke. Then, section 1-2 indicates the stop period at this reversal position, and at point 1 2, the rear wiping stroke begins, and similarly, with a sinusoidal speed characteristic, it reaches the reversal position 3 from the backward stroke to the forward stroke, and 1 section 3-4 After the inversion position stop period, the same cycle is repeated again. Then, if you switch to wiper switch 5oovoyy, this summer, the auto stop cam 210 will check if the wiper blade is in the forward wiping process or deferred payment 81 → 8) → wiper switch ('a-+
Current is supplied to the drive motor 201 independently of the state of the wiper motor (+1 → M−+) and the flow 1 reversal position cam 220, and the auto stop cam 220
The rotation continues until the cam contact switches from 8B to 88. When the cam contact switches to 8sK, the terminal 8 of the wiper motor is connected to the ground terminal E, and no motor current is supplied, and the drive motor 201 is braked to a stop, and the wiper motor 201 is braked to a stop. The operation ends at the automatic stop position, which is the reversal position of the wiper blade 103 from the backward stroke to the forward stroke. The wiping operation characteristics at this time are the second
This is section 7'-8 in Figure-).

If the wiper switch is switched to vmill, the same control as the above-mentioned low cycle wiping mode is performed, and the current is changed from battery to terminal 13 to P wet to Pg to terminal 12 to wiper switch (H to +
2)→wiper motor (+2→M−+B) and flow drive motor 2Q1 rotate at high speed. This high-speed rotation performs a high-speed wiping operation, and the wiper blade 10
The wiping operation axis characteristic of No. 3 depicts a speed characteristic with a short cycle time, that is, with a large number of wiping cycles, as shown in Fig. 2 (b).

Other embodiments are shown in Fig. 85 and Fig. 4. This embodiment is as follows:
As shown in FIG. 5, a variable resistor Rt is connected between a stop time control cam 601 which is fixed to the rotating shaft of the drive motor 201 of the wiper motor 200 and rotates uniformly as the drive motor rotates, and a cam contact fl. The cam 6010 is provided in the wiper control relay 400, and the discharge resistance of the capacitor C is made variable by the action of the cam 6010. The stop time control cam 601 is arranged so that the discharge resistance of the capacitor CI is simply R= when reversing from the forward stroke to the backward stroke, and (R2+R) when reversing from the backward stroke to the forward stroke. It is. And in the wiper switch 300,
The wiping mode changeover switch iNT~H1 can control the wiping rotation according to the raindrops.By operating this switch, the resistance R(7) value '4I:R can be changed steplessly or stepwise from 6 to 0.

Change the wiping mode from intermittent wiping (1 fee) to high-speed repeated wiping (H
By changing up to l), the configuration is such that the wiping operation can be performed very comfortably.

At this time, if the wiping operation axis of the wiper blade 103 is selected to 1, for example, the value YR of the resistance R, by selecting the wiping mode of the wiper switch 300, the wiping operation axis will change from the forward stroke to the backward stroke as shown in FIG. At the time of reversal, the stop time 1-2 corresponding to the discharge time determined by the discharge resistance R, is obtained, and at the time of reversal from the backward stroke to the forward stroke, the stop time 3-4 corresponding to the discharge time determined by the discharge resistance (R, +RO) is obtained. In the latter case, the wiping stop time when reversing becomes longer, so the number of times of wiping per unit time is reduced, making it suitable in situations where there is a small amount of raindrops adhering to the windshield surface, such as during light rain or idling. A sweeping motion is obtained. Also.

Set the value of resistance R to 1knx zero, i.e. wiper motor?
If the 300 w 111 mode is selected, the discharge resistance will be yRl during any reversal of the reciprocating stroke, so the stop period at 'Wc when reversing from the backward stroke to the forward stroke will be the same as the reversal from the forward stroke to the backward stroke. The wiping operation characteristics of the wiper blade 103 are the same as the stop period at the time, as shown in Fig. 4 (C).
This mode is suitable for heavy rain that requires frequent wiping, or when driving at high speeds. Figure 1g4 (t+l is the wiping operation characteristic when the wiping mode is set between iNT (intermittent) and Hl (high speed).

According to the present invention, the reversal position cam 2 provided on the wiper motor 200 can be used both when the wiper blade is reversed from the forward stroke to the backward stroke and when the wiper blade is reversed from the backward stroke to the forward stroke.
20, the wiping operation is stopped for a predetermined period of time, so there is less impact noise during one reversal, the system operates quietly, and the durability of the system can be improved. Since an appropriate wiping frequency mode can be set according to the amount of raindrops that adhere to the vehicle per unit time, it is possible to drive comfortably and safely.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an electric circuit of a wiper device according to an embodiment of the present invention, and FIGS. 2(a) and (b) show wiping speeds during low-speed operation and high-speed operation, respectively, according to the embodiment of FIG. 6 is a characteristic diagram, and FIG. 6 is a schematic diagram of an electric circuit of a wiper device according to another embodiment. FIGS. 4(a), 4(b) and 4(c) are wiping speed characteristic diagrams during intermittent operation, low speed operation and high speed operation, respectively. Explanation of symbols 100 - Wiper movable part 102 - Link mechanism 1
03... Wiper blade 200... Wiper motor 201... Drive starter 210... Auto stop cam 220... Reversing position cam that serves as a reversing position detection device 400... Wiper control relay C1°R1.・4 people including the stop sustaining device Nasu capacitor and resistance agent Kogai Asamura

Claims (1)

[Claims] (11 Wind r
A wiping method characterized by providing a braking stop period in which the wiper blade is stopped for a predetermined time when the wiper blade is reversed from the forward stroke to the backward stroke and from the backward stroke to the forward stroke.・ (2) A wiper blade arranged in contact with the wind surface, a drive motor that rotates uniformly, and a drive motor that is mechanically coupled to the rotating shaft of the wiper blade and the drive motor, and that rotates the drive motor to cause the wiper blade to reciprocate and oscillate. The converting link device E detects the reversal position Ikl of the wiper blade from the forward stroke to the backward stroke and the reversal position Ikl of the wiper blade from the forward stroke to the forward stroke in response to the rotation of the drive blade, and detects the reversal position Ikl of the wiper blade from the forward stroke to the forward stroke, and detects the reversal position Ikl of the wiper blade from the forward stroke to the forward stroke, and detects the reversal position Ikl of the wiper blade from the forward stroke to the forward stroke. A wiping device that has a detection device that stops rotation, and a stop sustaining device that maintains the rotation of a drive motor for a predetermined period of time in response to an output signal of the detection device.