JPS6296154A - Wiping area control unit for wiper device - Google Patents

Abstract

PURPOSE:To control the wiping area of a wiper device via the rotating direction control of a motor by controlling its activation based on the wiping area change signal of a wiper and the predetermined rotation position signal of the wiper. CONSTITUTION:A stop/rotation position detecting means is constituted of the electrode plate 42 of a cam plate 41 interlocked with a wiper blade motor 4 and rotated 360 deg. for one reciprocal motion of a wiper blade and points 43, 44, 45. The point 43 is invariably brought into contact with the electrode plate 42, the point 44 is brought into contact at a notched point U, and the point 45 in the symmetrical angle area centering the notched point U. When the wiping area is to be electrically switched, a transfer switch 6 is turned on to generate a signal, a detecting means is operated as a rotation position detecting means, and the signal of the point 45 is made effective. As a result, a relay contact 9a is shifted at the contact point with the electrode plate 42 via the circuit of a transistor 18, the energizing direction is reversed, the motor 4 is reversed, and the wiping area is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wiping range control device for a vehicle wiper device that reciprocates and wipes a windshield surface of a vehicle.

(Prior Art) Conventionally, when snow accumulates in winter, if snow accumulates on the lower side of the windshield or the lower inverted position of the wiper blade, this accumulated snow will prevent the wiper blade from descending even if the wiper motor is energized. There is.

As a solution to this problem, a method has been proposed in which the wiping range is changed by changing the lower inversion position of the wiper blade, as disclosed in, for example, Japanese Patent Laid-Open No. 59-53255.

[Problems to be solved by the invention] However, in order to change the wiping range in the conventional wiper blade, it is necessary to mechanically change the rotation radius of the crank arm of the link mechanism that drives the wiper blade and the motor. . For this reason, the wiper link mechanism and the like are complicated and expensive, and the wiper range cannot be changed from inside the vehicle.

The present invention has been made in view of the above problems, and an object thereof is to provide a wiping range control device that can control the wiping range of a wiper device by controlling the rotational direction of an electric motor.

[Means for solving problems]

The present invention, as a means to solve the above-mentioned problems, provides a wiper device in which a wiper reciprocates on a window by rotating a motor capable of forward and reverse rotation in one direction, the wiper rotating in the opposite direction. rotational position detection means provided on an interlocking member that interlocks with the rotational movement and detects a predetermined rotational movement position of the wiper and generates a position signal; and a rotational position detection means that generates a wiping range change signal for changing the wiping range by switching. and an energization control means that controls energization so that the direction of rotation of the motor is reversed when the position signal is input while the wiping range change signal is input.

〔Example〕 The present invention will be explained below based on an embodiment shown in the drawings.

FIG. 1 shows an electrical circuit diagram of an embodiment of the present invention, and FIG.
In the figure, reference numeral 3 indicates an on-vehicle battery, and an ignition switch, a switch 2, and a fuse 1 are connected to the battery 3. Reference numeral 4 denotes a wiper drive motor that can rotate in forward and reverse directions.The rotation of the motor 4 rotates a cam plate 41 via a worm gear (not shown), and the rotation of this cam plate 41 is transferred to the wiper drive via a link mechanism (not shown). This is transmitted to the rotational movement of the blade, and one rotation of the cam plate 41 is linked to one reciprocating rotational movement of the wiper blade. Note that the positions at both ends of the reciprocating motion of the wiper blade at this time are referred to as the lower inversion position and the lower inversion position.

As shown in FIG. 4, an electrode plate 42 having a notch is provided on the cam plate 41 so as to rotate together with the cam plate 41, and three contactors (points) 43, 44, and 45 are in contact with the electrode plate 42. These components constitute stop/rotation position detection means. Point 43 is always in contact with the electrode plate 42, point 44 is in contact with the electrode plate 42 at the notch point U, and point 45 is within the angular range that is symmetrical about the notch point U (θ1 + θ2, θ8− Electrode plate 4 at θ2)
Contact 2.

5 operates the wiper motor 4 intermittently (TNT) and at low speed (
LOW) and high-speed operation (HI).The operation switch 5 is connected to a control circuit 7 for intermittent operation and a washer motor 50. 6 is a changeover switch for generating a signal to electrically change the wiping range;
It is installed on a part of the front panel inside the vehicle.

8 is a relay coil, 8a is a relay contact that is activated by energization of relay coil 8, 9 is a relay coil, 9a is a relay contact point that is activated by 1ffl electricity of relay coil 9, 10 is a relay coil, and 10a is energization of relay coil 10. FIG. 1 shows the state in which neither coil 8, 9, or 10 is energized. 1
1 is a D flip-flop, 12, 13 and 15, 16 are AND gates, 14 is an OR gate, and 17, 18 are transistors.

Next, its operation will be explained based on the above configuration.

When selecting the normal wiping range (hereinafter referred to as the first wiping range), the changeover switch 6 is turned off.

When the changeover switch 6 is off, one input of the AND gate 12 is at the H level, and one input of the AND gate 13 is at the L level, so only the signal from point 44 of the stop rotational position detection means is generated. becomes valid and the signal from point 45 becomes invalid. In other words, the stop/rotation position detection means acts as a stop position detection means. Furthermore, when the selector switch 6 is off, the R terminal of the D flip-flop 11 becomes H level, so Q continues to output L level. Therefore, since one input of the AND gate 16 is fixed at L level, the output is also fixed at L level. Therefore, the transistor 18 is not turned on, the relay coil 9 is not energized, and the contact 9a does not move.

Now, when the wiper operation switch 5 is set to the jNT position, the control circuit 7 outputs a waveform as shown in FIG. This output causes the output of the OR gate 14 to become H level,
Since the output of the AND gate 15 also becomes H level, the transistor 17 is turned on, the relay coil 8 is energized, the relay contact 8a moves, the wiper motor 4 is energized, and the motor 4 starts rotating in one direction. As the motor 4 rotates, the cam plate 41 rotates in conjunction with a worm gear (not shown). Here, since the changeover switch 6 is off, one input of the AND gate 12 is at I] level, and one input of the AND gate 13 is at L level, so the signal from the rotational position detection means is from point 44. Only these signals are valid. For this reason, the cam plate 41 rotates and points 4
4 is removed from the electrode plate 42, that is, GND, the other input of the AND gate 12 becomes H level, so the AND gate 12 outputs H level.

Therefore, even if the output from the control circuit 7 becomes the L level, the OR gate 14 continues to output the H level.

Therefore, the AND gate 15 continues to output the H level, the transistor 17 is turned on, and the relay coil 8 continues to be energized, so the wiper motor 4 continues to rotate in one direction. The wiper motor 4 continues to rotate and the cam plate 41 rotates once,
When the point 44 of the stop position detection means is connected to GND again, the other input of the AND gate 12 goes to L level, so the transistor 17 which was on as mentioned above turns off, so the wiper motor 4 Electric brakes are applied and the vehicle stops. After a certain period of time has passed, the control circuit 7 outputs H again.
When the level is output, the wiper motor 4 rotates in the same direction due to the above operation, resulting in intermittent operation.

When the wiper operation switch 5 is set to the LOW position, the H level is input to the OR gate 14, so the OR gate 1
4 outputs H level. Therefore, the AND gate 15 outputs an H level, the transistor 17 is turned on, the relay coil 8 is energized, the relay contact 8a is moved, and the motor 4 is energized via the low speed contact 4a, as described above. Rotate in the same direction.

When the wiper operation switch 5 is set to the Hl position, the relay coil 10 is energized from the operation switch 5, and the relay contact 10a moves. At the same time, H
Since the level is input, the OR gate 14 outputs the H level. Therefore, the AND gate 15 outputs an H level, the transistor 17 is turned on, the relay coil 8 is energized, and the relay contact 8a moves. Therefore, the motor 4 is energized via the high speed contact 4b and rotates in the same direction as described above.

While the wiper motor 4 is rotating (while the point 44 and the electrode plate 42 are out of contact), turn the wiper operation switch 5 ON.
When the OFF position is changed from T, LOW, or Hl, the signal from point 44 of the stop position detection means is output at H level, so next point 44 comes into contact with electrode plate 42, and point 44 The transistor 17 continues to be turned on until the signal from the wiper motor 4 reaches the level, and the wiper motor 4 continues to rotate until it reaches the stop position.

As described above, when the first wiping range is selected by the changeover switch 6, the motor 4 rotates in the same direction regardless of which position the wiper operation switch 5 is turned on. When the cam plate 41 rotates due to the rotation of the motor 4, the wiper blade reciprocates within a predetermined wiping range (between the lower inverted position and the lower inverted position) determined by the link mechanism that is linked to one rotation of the cam plate 41. Dispel. Further, when the operation switch 5 is off, the point 42 of the stop position detection means is stopped at the position where the electrode plate 42 comes into contact, that is, at the lower reversed position of the wiper blade.

Next, when selecting the second wiping range, switch 6
Turn on. When the changeover switch 6 is on, the L level is input to one input of the AND gate 12, and the H level is input to one input of the AND gate 13.
From point 45 (No. 8 is valid, and point 44
The signal from the stop/rotation position detection means becomes invalid, and the stop/rotation position detection means acts as a rotation position detection means.

Also, in this case, since the R terminal of the D flip-flop 11 becomes L level, the CL terminal of the D flip-flop 11
When the level rises from level I to level I, the output Q inverts the level (see FIG. 3). Therefore, this output is input to one input of AND gate 15 and AND gate 16, so when output Q is at H level, AND gate 16 is enabled, and when output Q is at L level, AND gate 15 is input.
becomes effective.

Now, when the wiper operation switch 5 is set to the INT position, the control circuit 7 outputs a waveform signal as shown in FIG.

This output signal causes the output of the OR gate 14 to go high. Now, since the CL large input of the D flip-flop 11 remains at the H level, the output Q outputs the L level. Therefore, the AND gate 15 becomes valid and the OR gate 1
4 outputs an H level, the AND gate 15 outputs an H level, the transistor 17 turns on, and the relay coil 8
is energized, the relay contact 8a moves, and the wiper motor 4
Since the motor 4 is energized, the motor 4 starts rotating in the same first direction as described above. As a result, the cam plate 41 also rotates.

Since the changeover switch 6 is on at this point, as described above, the signal from point 45 is valid as the signal from the stop/rotation position detection means, and the signal from point 44 is invalid. For this reason, the cam plate 41 rotates, and the point 4
5 is removed from the electrode plate 42, the AND gate 1
Since the other input of 3 becomes H level, AND gate 13 outputs H level. Therefore, even if the output from the control circuit 7 becomes the L level, the OR gate 14 continues to output the H level. At this time, the output of the AND gate 13 is passed through the impark 21 to the CL of the D flip-flop 11.
Since the D flip-flop 11 is connected to the CL terminal, the CL terminal of the D flip-flop 11 falls from the H level to the L level. However, in this case, the output Q of the D flip-flop 11 is not inverted and continues to be output at L level. Therefore, and gate 15
becomes effective. Therefore, the AND gate 15 continues to output the H level, the transistor 17 is turned on, and the relay coil 8 continues to be energized, so even if the point 45 comes off the electrode plate, it continues to rotate in the first direction. When the wiper motor 4 continues to rotate in the first direction and the point 45 of the rotational position detection means comes into contact with the electrode plate 42 again, the other input of the AND gate 13 becomes L level, so it is turned on as described above. Since the transistor 17 is turned off,
An electric brake is applied to the wiper motor 4 to temporarily stop it.

At the same time, when the point 45 contacts the electrode plate 42 and the output of the AND gate 13 changes from H level to L level, the CL terminal of the D flip-flop 11 rises from L level to H level, so the output Q is inverted. and outputs H level. When the control circuit 7 outputs the I] level again, the output of the OR gate 14 becomes H level. Now, since the Q output of the D flip-flop 11 is at H level, the AND gate 16 is enabled, and the output of the AND gate 16 becomes H level due to the H level output of the OR gate 14.

Then, the transistor 18 is turned on, the relay coil 9 is energized, and the relay contact 9a moves. Therefore, since the wiper motor 4 is energized in the opposite direction to that described above, the wiper motor 4 is reversed from the aforementioned first direction and begins to rotate in the opposite direction. After this, when the point 45 comes into contact with the electrode plate 42 again, the wiper motor 4 is temporarily stopped and the control circuit 7
When the signal is generated again from , the motor 4 reverses and starts rotating in the first direction again. In this way, the motor 4 rotates forward,
Repeat the reverse rotation to perform intermittent operation.

Also, when the wiper operation switch 5 is set to the LOW or Hl position, the motor 4 is driven by repeatedly stopping and reversing each time the point 45 and the electrode plate 42 come into contact, as described above.

Also, while the wiper motor 4 is rotating, the operation switch 5 is turned on.
When the OFF position is selected from T, LOW, or Hl, and the point 45 is not in contact with the electrode plate 42, the signal from the point 45 is 1 (level is being output, so the transistor 17 is turned on). continue.

Or transistor 18 remains on. Therefore, the motor 4 continues to rotate forward or reverse, and then when the point 45 comes into contact with the electrode plate 42, the rotation stops at that position.

As described above, when the second wiping range is selected by the changeover switch 6, the signal from the point 45 of the rotational position detection means becomes valid. Therefore, once the point 45 comes off from the electrode plate 42, when the point 45 contacts the electrode plate 42, each time the point 45 comes into contact with the electrode plate 42, the motor 4
is controlled to reverse the direction of rotation. By repeating this reversal of the motor 4, the cam plate 41 also rotates in conjunction with the rotation range of the cam plate 41, and the wiper blade is moved to a lower position than the lower reversal position in the first wiping range. Flip and wipe away. In Fig. 5, the first wiping range angle: α, its lower inverted position: A5, and its lower inverted position: A
2, second wiping range angle: β, and lower inversion position: A3. In other words, when using the electrode plate 42 as shown in FIG. As shown in the figure, the lower inverted position A of the first wiping range moves to A3 above it and becomes the lower inverted position of the second wiping range. Incidentally, at this time, the lower reversal position A2 is the same position.

Furthermore, in this circuit, if the shape of the electrode plate 42 is set to θ1 ≠ 02 as shown in FIG. 6, the lower inverted position of the second wiping range may also be at the A4 position, which is not the same as the A3 position, as shown in FIG. appear. That is, when the second wiping range is selected, the wiper blade rotates back and forth from the lower inverted position A3 to the lower inverted position A2 to the lower inverted position A4, and vice versa. If the movement of this wiper blade and another wiper blade are controlled in the same way, the intersection of the two wiper blades can be alternated, which also has the advantage of preventing chattering of the wiper blade.

In addition, the shape shown in Fig. 8, that is, θ, 10θ2〉180°
Under the conditions, the second wiping range angle ε becomes as shown in FIG. 9, and the lower inversion position and the lower inversion position become A3 and A. At this time, the lower inversion position A2 of the first wiping range and the second
The lower reversal position A5 of the wiping range is a different position.

As described above, by changing the shape of the electrode plate 42, which is one of the rotational position detection means, using the circuit shown in FIG. Furthermore, since the lower inversion position can be easily changed, there is also the advantage that the driver can focus on wiping the area that is particularly necessary.

In the above embodiment, the stop/rotation position detecting means is composed of the wiper blade, the electrode plate 42 of the cam plate 41 interlocked with the motor 4, and the point 43°44.45, but instead of the electrode plate 42, a similar shape may be used. The light-shielding plate may also be constructed of both by using a photo ink rubber or the like instead of the points. In addition, a light shielding plate that rotates together with the cam plate and has a window for transmitted light, a photo coupler, a counter, etc., is used to count the pulses of light passing through the window for transmitted light. , reverse energization control of the motor 4 may be performed using a predetermined count value. The rotational position detection means may be a sensor that detects the amount or position of other interlocking members that move in conjunction with the rotational position of the wiper blade, such as the wiper blade, link mechanism, crank arm, cam ring, etc. Good too.

〔Effect of the invention〕

As described above, the present invention provides a predetermined wiping range of the wiper that is determined in conjunction with the rotation of the motor when the motor rotates in one direction, and a second wiping range that is determined by the reverse control position when the motor is reversely controlled. In particular, since the predetermined wiping range can be determined by a conventional wiper device, this can be achieved without significantly changing the mechanical mechanism of the wiper device.

Furthermore, by using the present invention, if the lower reversal position, which is at least one end of the wiping range of the wiper device, is changed to a position higher than the conventional lower reversal position, it is possible to prevent snow from accumulating on the lower side of the windshield during snow accumulation in winter, etc. Even in such a case, it is possible to prevent the wiper from being blocked by snow from descending.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram of each part when the changeover switch (6) in FIG. 1 is off and the wiper operation switch (5) is in the INT position. Figure 3 is a waveform diagram of each part when the changeover switch (6) in Figure 1 is on and the wiper operation switch (5) is in the INT position, and Figure 4 is a waveform diagram of the electrode plate (4) shown in Figure 1.
2), FIG. 5 is an explanatory diagram showing the wiping range of the wiper corresponding to electrode plate 1-(42) shown in FIG. 4, and FIG. 6 shows an electrode plate of another shape. A partial view, FIG. 7 is an explanatory view showing the wiping range of the wiper corresponding to the electrode plate shown in FIG. 6, FIG. 8 is a partial view showing an electrode plate of another shape, and FIG. FIG. 3 is an explanatory diagram showing a wiping range of a wiper corresponding to an electrode plate having a structure of FIG. 2...Ignition switch, 3...Ha/7teri. 4... Wiper motor, 5... Operation switch, 6...
・Choice switch, 8...Relay, 9...Relay, 1
0...Relay, 11...D flip-flop, Pu, 12
,13,15.16...AND gate 14...OR gate, 41...cam plate 42...electrode plate, 43°44.45...point.

Claims (1)

[Scope of Claims] A wiper device in which a wiper rotates back and forth on a window by rotating a motor capable of forward and reverse rotation in one direction, the interlocking member interlocking with the rotational movement of the wiper. a rotational position detection means provided in the wiper for detecting a predetermined rotational movement position of the wiper and generating a position signal; and a switching means for generating a wiping range change signal for changing the wiping range by switching; A wiping range control device for a wiper device, comprising: energization control means that controls energization so that the rotation direction of the motor is reversed when the position signal is input in a state where a range change signal is input.