JP2000118359A - Wiper motor rotating position detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper motor rotating position detecting device capable of stable controlling by detecting wiping angles with high accuracy by use of a single contactor. SOLUTION: This device includes a contact plate 30 which rotates together with an output shaft 11 provided at a wiper motor 2, and which has a wiping area in a range predetermined to match the wiping angle of each wiper blade 50 and a deceleration area disposed on the wiping area, and a single contactor 31 which generates a wiper-driving reference signal when on the wiping area of the contact plate 30, and which generates a wiper-decelerating reference signal when on the deceleration area of the contact plate 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational position detecting device for a wiper motor used for inverting and operating a wiper at a predetermined position.

[0002]

2. Description of the Related Art As a rotational position detecting device for a wiper motor that operates by inverting a wiper at a predetermined position,
2. Description of the Related Art There is known a contact plate that includes a contact plate that rotates while being connected to a wiper motor and a contactor that is electrically connected to the contact plate to detect a position of a wiper blade.

[0003]

In the above-described apparatus for detecting the rotational position of a wiper motor, when the wiper blade moves from the lower reversal position to the upper reversal position, the wiper blade comes close to the upper reversal position. Is detected, deceleration control is performed on the wiper motor. When it is detected that the wiper blade has reached the upper reversal position, reversal control is performed on the wiper motor, and the wiper blade is moved to the lower reversal position. The deceleration control is performed on the wiper motor by detecting that the wiper motor is near, and the reversal control is performed on the wiper motor by detecting that the wiper blade has reached the lower reverse position. The position of the blade was detected by a plurality of contactors. for that reason,
An error occurs in the detection accuracy due to a variation in the mounting position of the contactor, and as a result, there is a problem that the wiping angle of the wiper blade is shifted or the stop position is different, so that stable control cannot be performed.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wiper motor rotational position detecting device capable of performing stable control by detecting a wiping angle with high accuracy using a single contactor. It is an object.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided a rotational position detecting apparatus for a wiper motor, comprising: a wiper motor for reciprocating a wiper blade by forward and reverse rotation; and an output shaft coupled to an output shaft provided on the wiper motor. Rotating with the shaft, having a wiping area of a predetermined range according to the wiping angle of the wiper blade, a contact plate having a deceleration area arranged on the wiping area, and a contact plate arranged on the contact plate, the contact plate It is characterized in that it has a single contactor that generates a wiper drive reference signal when it is on the wiping area and generates a wiper deceleration reference signal when it is on the deceleration area of the contact plate. I have.

In the wiper motor rotational position detecting device according to a second aspect of the present invention, the deceleration area of the contact plate is arranged as a pair in the wiping area.

According to a third aspect of the present invention, in the rotational position detecting apparatus for a wiper motor, the contactor is connected to a ground.

According to a fourth aspect of the present invention, in the rotational position detecting apparatus for a wiper motor, a signal is formed in the deceleration area of the contact plate when the ground is released.

The rotational position detecting device for a wiper motor according to a fifth aspect of the present invention is characterized in that it is provided with a second contactor for detecting that the wiper blade has reached the retracted position.

In the wiper motor rotational position detecting device according to claim 6 of the present invention, the wiper motor is provided with third and fourth contactors for detecting that the wiper blade is located in the intermediate operating region in the wiping region. It is characterized by:

According to a seventh aspect of the present invention, in the wiper motor rotational position detecting device, the contact point between the third and fourth contactors is switched within the deceleration region of the contact plate.

[0013]

In the wiper motor rotational position detecting device according to the first aspect of the present invention, a wiper drive reference signal is generated for a contact plate having a wiping area and a deceleration area when the contactor is on the wiping area. When the contactor is in the deceleration region, a wiper deceleration reference signal is generated. Therefore, the wiping angle is determined based on the detection signal of a single contactor.

In the rotation position detecting device for a wiper motor according to a second aspect of the present invention, a pair of deceleration regions of the contact plate are arranged in the wiping region. Therefore,
As the detection signal of a single contactor, both deceleration regions of upward inversion and downward inversion can be configured.

In the rotational position detecting device for a wiper motor according to the third aspect of the present invention, since the contactor is connected to the ground, the contact plate is electrically connected to the contactor, whereby the contact plate is grounded. Therefore, a simple circuit configuration is used to configure a control circuit triggered by the potential of the contactor.

In the rotational position detecting device for a wiper motor according to the fourth aspect of the present invention, if the wiping area is made conductive and the deceleration area is made non-conductive, the contact plate can be easily formed.

In the wiper motor rotational position detecting device according to the fifth aspect of the present invention, the second contactor detects that the wiper blade has reached the retracted position. Therefore, the rise-up function is realized with a simple structure.

In the rotational position detecting device for a wiper motor according to a sixth aspect of the present invention, when the third and fourth contactors detect that the wiper blade is located in the intermediate operation area in the wiping area, deceleration control is performed. The logic for this is configured. Therefore, the deceleration control is easily performed.

In the rotational position detecting device for a wiper motor according to a seventh aspect of the present invention, the contact point between the third and fourth contactors in the deceleration region of the contact plate is switched, and the ground in the deceleration region is released. Therefore, even if a mounting error occurs between the third, fourth, and ground contactors, it does not affect the electrical contact signal. Therefore, the wiping operation is performed accurately and easily.

[0020]

1 to 20 show one embodiment of a rotational position detecting device for a wiper motor according to the present invention.

The rotational position detecting device 1 for a wiper motor according to the present invention is built in a wiper motor 2, and the wiper motor 2 mainly includes a motor unit 3 and a control unit 4. The rotation position detecting device 1 is provided in the control unit 4.

The motor section 3 includes a yoke 5, a first magnet 6, a second magnet 7, an armature 8, a gear case 9, a wheel gear 10, and an output shaft 11.

The yoke 5 has a first magnet 6 and a second magnet 7 fixed inside a cylindrical main body 5a, and a first bearing 1 inside a closed one end.
2 are installed. The open end of the yoke 5 is screwed to the gear case 9 by a screw 13.

The armature 8 is arranged inside the first and second magnets 6 and 7. An armature core 15 and a commutator 16 are fixed to an armature shaft 14 provided in the armature 8. Armature 8 has commutator 1
The armature coil 17 is electrically connected to the plurality of commutator pieces 16a provided in 6 and wound around a winding portion 15a formed on the armature core 15 in the same number as the commutator pieces 16a.

A first brush 18 and a second brush 19 are arranged outside the commutator 16, and the first and second brushes 18 and 19 are connected to the commutator 1.
6 are pressed so as to be electrically connectable to the respective commutator pieces 16a.

The armature shaft 14 has one end rotatably supported by the first bearing 12, and the other end inserted into a shaft hole 9 a formed in the gear case 9.
A second bearing 20 having a central portion attached to the shaft hole 9a
The other end is rotatably supported by the shaft hole 9a.
Is rotatably supported by a third bearing 21 attached to the end of the third bearing. And armature shaft 14
Is formed with a worm 14a near the other end, and the worm 14a is meshed with the wheel gear 10.

The gear case 9 is formed with a wheel gear housing 9b communicating with the shaft hole 9a, and a wheel gear 10 is disposed in the wheel gear housing 9b. The wheel gear 10 is fixed to an output shaft 11 rotatably supported by the gear case 9. The output shaft 11 protrudes outside the gear case 9 and has a wiper blade 50 coupled thereto.

In the motor section 3, the first and second brushes 1
Since the first and second brushes 8 and 19 are connected to the control unit 4 and the current is supplied from the control unit 4 to the second brush 19, the armature shaft 14 rotates forward to rotate the wheel gear. By rotating the wiper blade 50 forward by the forward rotation of the armature 10, when the current is supplied from the control unit 4 from the second brush 19 to the first brush 18, the armature shaft 14 is rotated. The wiper blade 50 is moved backward by the reverse rotation and the reverse rotation of the wheel gear 10.

The gear case 9 has a plate-shaped first plate 22 which covers the wheel gear accommodating portion 9b and which constitutes a part of the rotational position detecting device 1, which is screwed with a screw 23. A second plate 24, which constitutes a part of the control unit 4, is provided above the first plate 22 with the screws 2.
5 screwed.

The rotation position detecting device 1 includes a contact plate 30, a first contactor 31, and a second contactor 3.
2, a third contactor 33 and a fourth contactor 34 are provided.

The contact plate 30 is formed of a conductive material and is insulated and mounted on the wheel gear 10 of the motor unit 3.
0a is formed, and on the inner peripheral side, a second rotary contact portion 30b that is electrically connected to the first rotary contact portion 30a is formed.

The first rotary contact portion 30a is formed in an arc shape concentric with the output shaft 11. As shown in FIG. 5, the first rotary contact portion 30a has a first conductive region 30a1 that is conductive, and a first conductive region 30a1 that is formed at both ends of the first conductive region 30a1 in a predetermined range. Conductive first non-conductive area 30a2 (E), second non-conductive area 30
a3 (F), a second conductive region 30a4 connected to the first non-conductive region 30a2, and a second non-conductive region 30.
and a third conductive region 30a5 that is continuous with a3. First and second non-conductive areas 30a2, 30
The wiping area D of the wiper blade 50 is appropriately selected based on a3 and the first conduction area 30a1.

The second rotary contact portion 30b is formed in an arc shape concentric with the output shaft 11, and has a conductive fourth conductive region 30b1 which is arranged offset from the first rotary contact portion 30a.

First, second, third and fourth contactors 3
1, 32, 33, and 34 are respectively insulated and attached to the first plate 22, and are linearly arranged.

The first contactor 31 is connected to the ground in the control section 4, and the first contactor 31 is arranged so as to be pressed against the first rotary contact portion 30a of the contact plate 30. Is electrically connected to any one of the first conductive region 30a1, the second conductive region 30a4, and the third conductive region 30a5 of the first rotary contact portion 30a, so that a low-level detection signal (for wiper driving) A reference signal) is generated to set the contact plate 30 to a low level, and the second, third, and fourth contactors 32, 33, and 34 electrically connected to the contact plate 30.
Has a function to give low level to

The first contactor 31 generates a low-level detection signal when the wiper blade 50 is electrically connected to the first conduction region 30a1 while the wiper blade 50 is moving forward. When approaching position C,
A high-level detection signal (wiper deceleration reference signal) is generated by being cut off from the first conduction region 30a1 and entering the first non-conduction region 30a2. The high-level detection signal generated by entering the first non-conducting region 30a2 is used for performing deceleration control in front of the upper reversal position C during the forward movement of the wiper blade 50.

The first contactor 31 generates a low-level detection signal by being electrically connected to the first conduction region 30a1 while the wiper blade 50 is returning. When approaching the lower inversion position B, it is cut off from the first conduction region 30a1 and enters the second non-conduction region 30a3 to generate a high-level detection signal (wiper deceleration reference signal). The high-level detection signal generated by entering the second non-conduction region 30a3 is used for performing deceleration control in front of the downward reversal position B during the backward movement of the wiper blade 50.

The second contactor 32 is arranged so as to be pressed against the contact plate 30 on the side of the second rotary contact portion 30b. The second contactor 32 is a wiper blade 5
0 is used to determine whether or not it has reached the storage position A by moving downward from the lower inverted position B by the angle G shown in FIG.

The third contactor 33 is approximately 180 degrees above the contact plate 30 with respect to the second contactor 32.
On the opposite side, the contact plate 30 is arranged so as to be pressed toward the second rotating contact portion 30b. The third contactor 33 is used to determine whether or not the wiper blade 50 is in an intermediate operation area between the lower turning position B and the upper turning position C.

The fourth contactor 34 is approximately 180 degrees above the contact plate 30 relative to the first contactor 31.
The contact plate 30 is pressed against the first rotating contact portion 30a of the contact plate 30 on the opposite side. The fourth contactor 34 is used to determine whether or not the wiper blade 50 is in an intermediate operation area between the upper reversing position C and the lower reversing position B.

In the rotational position detecting device 1, when the wiper blade 50 is at the storage position A at time a in FIG.
As shown in FIG. 5, since the first contactor 31 is electrically connected to the third conduction region 30a5 of the first rotating contact portion 30a, the first contactor 31 becomes low level, and the second contactor 32 becomes the second contactor 32. Fourth conductive region 30 of rotating contact portion 30b
b1 is at a high level because it is cut off, and the third contactor 33 is at a low level because it is electrically connected to the fourth conductive region 30b1 of the second rotary contact portion 30b, and the fourth contactor 34 is First rotating contact portion 30
Since it is cut off from the second conductive region 30a4 of FIG. Therefore, a low level is given to the third contactor 33.

In the rotational position detecting device 1, when the wiper blade 50 starts moving forward from the storage position A, at time b after time a in FIG. 14, as shown in FIG.
The first contactor 31 is the third rotating contact portion 30a having the third contactor.
And the second contactor 32 is electrically connected to the fourth conductive region 30b1 of the second rotary contact portion 30b, and is at a low level because the second contactor 32 is electrically connected to the conductive region 30a5. The third contactor 33 is the second
Is electrically connected to the fourth conductive region 30b1 of the rotary contact portion 30b of the first rotary contact portion 30a.
Since it is cut off from 0a4, it becomes high level. Therefore, the second contactor 32 and the third contactor 33
Is given a low level.

In the rotational position detecting device 1, when the wiper blade 50 reaches the lower turning position B at time c after time b in FIG. 14, the first contactor 31 is moved to the first contactor 31 as shown in FIG. Is electrically connected to the third conductive region 30a5 of the rotary contact portion 30a of the second rotary contact portion 30a.
b is at a low level because it is electrically connected to the fourth conductive region 30b1, and the third contactor 33 is electrically connected to the fourth conductive region 30b1 of the second rotary contact portion 30b. Becomes low level, and the fourth contactor 34 is connected to the second conductive region 30 of the first rotary contact portion 30a.
Since it is cut off from a4, it becomes high level. Therefore, the second contactor 32 and the third contactor 33
Is given a low level.

In the rotational position detecting device 1, after the time c, the time d, the time e, and the time f in FIG.
8 while passing through the downward reversal position B and continuing the forward movement.
As shown in FIG. 2, the first contactor 31 is electrically connected to the first conduction region 30a1 of the first rotary contact portion 30a, and thus, becomes low level, and the second contactor 3
2 is the fourth conductive region 30b1 of the second rotary contact portion 30b
Is low level because it is electrically connected to
Since the contactor 33 is disconnected from the fourth conductive region 30b1 of the second rotary contact portion 30b, the contactor 33 becomes high level, and the fourth contactor 34 is disconnected from the second conductive region 30a4 of the first rotary contact portion 30a. High level because Therefore, a low level is given to the second contactor 32.

In the rotational position detecting device 1, after the time f in FIG. 14, the wiper blade 50 moves to the upper turning position C in FIG.
When approaching at time g in FIG. 4, as shown in FIG. 9, the first contactor 31 enters the first non-conducting region 30a2 of the first rotating contact portion 30a, so that the first contactor 31 becomes high level, and the second contactor 32 Are electrically connected to the fourth conductive region 30b1 of the second rotary contact portion 30b,
Since the first contactor 31 is in the first non-conducting region 30a2, it goes to a high level, and the third contactor 33
Is cut off from the fourth conductive region 30b1 of the second rotary contact portion 30b, so that the fourth contactor 34 is connected to the third conductive region 3b of the first rotary contact portion 30a.
Although it is electrically connected to 0a5, it is at a high level because the first contactor 31 is in the first non-conductive region 30a2. Therefore, a low level is not applied to the second, third, and fourth contactors 32, 33, and.

In the rotational position detecting device 1, at time i after time g and time h in FIG.
Reaches the upper reversal position C, as shown in FIG. 10, the first contactor 31 is electrically connected to the second conduction region 30a4 of the first rotary contact portion 30a, so that the first contactor 31 becomes low level. Since the second contactor 32 is electrically connected to the fourth conduction region 30b1 of the second rotating contact portion 30b, the second contactor 32 is at a low level, and the third contactor 33 is in the fourth conduction state of the second rotating contact portion 30b. Since it is cut off from the region 30b1, it becomes high level, and the fourth contactor 34 is connected to the third conductive region 30 of the first rotary contact portion 30a.
It is low level because it is electrically connected to a5.
Therefore, a low level is applied to the second and fourth contactors 32 and 34.

In the rotational position detecting device 1, when the wiper blade 50 reverses at the upper reversing position C and starts moving backward toward the lower reversing position B at time i in FIG.
As shown in FIG. 3, the first contactor 31 is electrically connected to the first conductive region 30a1 of the first rotary contact portion 30a, and thus, is at a low level, and the second contactor 32 is connected to the second rotary contact portion. Since the third contactor 33 is electrically connected to the fourth conductive region 30b1 of the second rotary contact portion 30b, the third contactor 33 is at a high level because the third contactor 33 is electrically disconnected from the fourth conductive region 30b1 of the second rotary contact portion 30b. ,
The fourth contactor 34 is a third contactor of the first rotary contact portion 30a.
Becomes a high level which is cut off from the conduction region 30a5.
Therefore, a low level is given to the second contactor 32.

In the rotational position detecting device 1, when the wiper blade 50 approaches the downward reversing position B, as shown in FIG. 12, the first contactor 31 is moved to the first rotational contact portion 30a.
The second contactor 32 is electrically connected to the fourth conductive region 30b1 of the second rotary contact portion 30b because the second contactor 32 is at a high level because it enters the second non-conductive region 30a3.
Since the first contactor 31 is in the second non-conducting region 30a3, it goes to a high level, and the third contactor 33
Is cut off from the fourth conductive region 30b1 of the second rotary contact portion 30b, so that the fourth contactor 34 is in the second conductive region 3b of the first rotary contact portion 30a.
Since it is cut off from 0a4, it becomes high level. Therefore, a low level is not applied to the second, third, and fourth contactors 32, 33, and.

In the rotational position detecting device 1, when the wiper blade 50 reaches the downward reversal position B, the first contactor 31 is moved to the first rotational contact portion 30 as shown in FIG.
a is at a low level because it is electrically connected to the third conductive region 30a5, and is at a low level because the second contactor 32 is electrically connected to the fourth conductive region 30b1 of the second rotary contact portion 30b. And the third contactor 33 is electrically connected to the fourth conduction region 30b1 of the second rotary contact portion 30b, so that the third contactor 33 is at a low level. Conduction region 3
Since it is cut off from 0a4, it becomes high level. Therefore, a low level is applied to the second and third contactors 32, 33.

The control unit 4 includes a microcomputer CPU
, Output driver 1, output driver 2, output driver 3, output driver 4, FET1, FET2, FET3,
FET4, first conversion circuit 35, second conversion circuit 36,
Third conversion circuit 37, fourth conversion circuit 38, power supply circuit 4
0, a reset circuit 41 is provided, and is disposed on the second plate 24.

The microcomputer CPU includes an input filter block 42, an input filter block 43, a control block 44, an output block 45, a timer 1, a timer 2,
The timer 3 and the hardware clock 46 are built in.

The drain of the FET 1 and the drain of the FET 2 are electrically connected to a first brush 18 provided in the motor unit 3, respectively. The drain of the FET 3 and the drain of the FET 4 are connected to the second brush 18 provided in the motor unit 3. 19 are electrically connected to each other to form a bridge circuit.

The output driver 1 and the output driver 4 are FE
By applying a gate voltage to T1 and FET4, a power supply 80 is supplied from the first brush 18 to the second brush 19.
In contrast to this, the output driver 3 and the output driver 2 provide a gate voltage to the FET 3 and the FET 2 so that the first brush 19
Has a function of flowing a current of the power supply 80 toward the brush 18.

Since the first conversion circuit 35 is electrically connected to the fourth contactor 34 of the rotational position detecting device 1, the first conversion circuit 35 is turned on when a low level is given from the fourth contactor 34 to turn on the input filter. The signal is transferred to the block 42. Since the second conversion circuit 36 is electrically connected to the third contactor 33 of the rotational position detection device 1, the second conversion circuit 36 is turned on when a low level is given from the third contactor 33, and is turned on by the input filter block 42. Transfer the signal.

Since the third conversion circuit 37 is electrically connected to the second contactor 32 of the rotational position detecting device 1, the third conversion circuit 37 is turned on when a low level is given from the second contactor 32 to turn on the input filter. The signal is transferred to the block 42. The fourth conversion circuit 38 includes an operation switch SW
The voltage signal of the power supply 80 supplied by turning on the operation switch SW is converted and transferred to the input filter block 43.

In the microcomputer CPU, FIG.
The control operation is performed based on the flowcharts shown in FIG. 17, FIG. 18, FIG. 19, and FIG. 16 shows a main routine, FIGS. 17 and 18 show a control routine, FIG. 19 shows an interrupt routine, and FIG. 20 shows an output routine.

When the power supply 80 is turned on through the power supply circuit 40, an initial setting for setting an interrupt, a timer, and each port is performed in step 300 of the main routine, and the process proceeds to step 301. , A plurality of reading routines based on signals given from the third and fourth contactors 32, 33, and 34 (position switches) are performed, and the routine proceeds to step 302, where step 30 is executed.
In step 2, a plurality of reading routines are performed based on a signal given from the operation switch, and the process proceeds to step 303. In step 303, the operation switch SW and the first, second,
The control routine for setting the operation of the motor unit 3 is executed by the third and fourth contactors 31, 32, 33, and 34, and the control returning to step 301 is repeated.

At this time, since the wiper blade 50 is in the storage position A, as shown in FIG. 5, the first contactor 31 of the rotation position detecting device 1
Is electrically connected to the third contactor 33
Is at a low level. As a result, a voltage signal is supplied to the input filter block of the microcomputer CPU through the third conversion circuit 37.

When the operation switch SW is turned on,
In step 100 of the control routine, an operation number indicating the order of motor operation is confirmed. Operation number is initially MO
V = 0, then MOV = 1, MOV = 2, MOV = 3, MOV = 4
, MOV = 5, MOV = 6, MOV = 7. In the determination in step 100, “the operation number is MOV = 0”
Therefore, the process proceeds to step 101, and in the determination in step 101, "because the operation switch SW is turned on", the process proceeds to step 102, and in step 102, "setting of the motor normal rotation" is executed.

If the initial setting has been completed in step 300, step 400 of the constant interrupt routine is executed. Therefore, in step 200 of the output routine, the count-up clear of the timer for which the interrupt interval time of the interrupt processing is set is performed. A certain "Timer 2 is initialized XT
"Set M2" is executed, and the routine goes to step 201. Since the determination in step 201 is "not a motor stop set", the routine goes to step 203, and step 203 is executed.
Since the determination in the above is "set of motor normal rotation", the process proceeds to step 204, where a drive signal is given from the output block 45 of the microcomputer CPU to the output driver 1 and the output driver 4, and the FET1 and the FET4 are turned on. The armature shaft 14 of the part 3 starts rotating forward.

Since the determination in step 205 is "set forward rotation of the motor", the process proceeds from step 207 to step 212, and the determination in step 212 terminates the output routine "because the reverse rotation of the motor has not been set". I do.

When the armature shaft 14 of the motor section 3 starts to rotate forward, the wiper blade 50 moves forward from the storage position A to the downward reversal position B, and as shown in FIG. First contactor 31
Are electrically connected to the contact plate 30, the second contactor 32 and the third contactor 33 are at a low level. As a result, the microcomputer is connected through the second and third conversion circuits 36 and 37. A voltage signal is applied to the input filter block of the CPU.

When the wiper blade 50 continues to move forward and reaches the downward reversal position B, the first contactor 31 of the rotational position detecting device 1 is electrically connected to the contact plate 30 as shown in FIG. Therefore, the second contactor 32 and the third contactor 33 are at a low level, and as a result, the second and third conversion circuits 3
A voltage signal is supplied to the input filter block of the microcomputer CPU through 6, 37.

When the wiper blade 50 continues to move forward, as shown in FIG. 12, the first contactor 31 of the rotational position detecting device 1 is not electrically connected to the contact plate 30, and the second contactor 32, the third contactor 33, and the fourth contactor 34 become high level. As a result, the input filter block of the microcomputer CPU passes through the first conversion circuit 35, the second conversion circuit 36, and the third conversion circuit 37. , The wiper blade 50 moves forward in the deceleration region F from the lower inversion position B.

After execution of step 102 of the control routine,
The process proceeds to step 103, where “set operation number MOV = 1” is executed, and the process proceeds to step 104. Since the operation number is MOV = 1 in the determination at step 104, the process proceeds to step 105, and the determination at step 105 proceeds to step 107 because the wiper blade 50 is not in the intermediate operation region.

In step 107, since "wiper blade 50 is in the deceleration region", the process proceeds to step 108, and in step 108, "FMOV is not set", so that steps 112, 117, 1
21, step 129, step 134, step 14
1. Go to END and return to the beginning of the control routine.

When the wiper blade 50 continues to move forward, the first contactor 31 of the rotational position detecting device 1 is electrically connected to the contact plate 30 as shown in FIG. As a result, a voltage signal is applied to the input filter block of the microcomputer CPU through the second conversion circuit 36, and the wiper blade 50 moves in the intermediate region from the lower inversion position B to the upper inversion position C. Go around.

Since the operation number MOV = 1 in the control routine, the process proceeds from step 104 to step 105, and the determination in step 105 indicates that "the vehicle is in the intermediate area".
Therefore, the process shifts to step 106 to set the passage flag FMOV. Since it is "not in the deceleration area" in the determination in step 107, the control routine is deviated here.

When the wiper blade 50 continuing to move forward approaches the upper reversing position C, the first contactor 31 of the rotational position detecting device 1 is cut off from the contact plate 30 as shown in FIG. Contactor 32 goes high.

Since it is determined in step 107 that the wiper blade 50 is in the deceleration region, step 1
08, the determination in step 108 indicates that the "passage flag FMOV has been set", so the flow shifts to step 109, where "set the motor to forward rotation deceleration" is executed.

If the initial setting has been completed in step 300, step 400 of the constant interrupt routine is executed. Therefore, in step 200 of the output routine, "set timer 2 to initialize XTM2" is executed and step 201 is executed. The process proceeds to step 203 because the determination in step 201 is "not a motor stop set" and the process proceeds to step 203. Since the determination in step 203 is "not a motor forward rotation set", the process proceeds to step 205 and proceeds to step 205. Since it is determined that the motor is not set for reverse rotation of the motor, the process proceeds to step 207 and proceeds to step 20.
Since the determination in step 7 indicates that "motor forward rotation deceleration is set", the flow proceeds to step 208, where drive signals are given to the output driver 2 and output driver 4 from the output block 45 of the microcomputer CPU, and FET2, FET4
Since the motor 4 is turned on, the armature shorter current is supplied to the motor unit 3, and the armature shaft 14 is decelerated and rotates forward, and the process proceeds to step 209.

In step 209, "setting of timer 1 used to measure the time to output different motors in the middle of the output block" is executed, and "motor forward rotation deceleration,
"XBRAKETM" which is a time for determining the motor stop time during the motor reverse rotation deceleration routine is set, and step 210 is executed.
Move to In step 210, the time-up of XBRAKETM is determined. When the time of XBRAKETM is up, the process proceeds to step 211. In step 211, a drive signal is supplied from the output block 45 of the microcomputer CPU to the output driver 1 and the output driver 4. Thus, FET1 and FET4 are turned on. Then, the process proceeds to step 212, and the output routine ends because "the motor reverse rotation deceleration has not been set" in the determination at step 212.

After "set motor to forward rotation deceleration" is executed in step 109 of the control routine, step 11 is executed.
0, and at step 110, the "passage flag FMOV
Is reset, and the routine goes to step 111.
In step 111, “set operation number MOV = 2” is executed, and the routine goes to step 112.

Since the wiper blade 50 moves forward and reaches the upper turning position C while being decelerated just before reaching the upper turning position C, the first contactor of the rotation position detecting device 1 as shown in FIG. 31 is the contact plate 3
0, the second contactor 32,
The fourth contactor 34 goes low, resulting in
Microcomputer CPU through the second conversion circuit 36
Are supplied with a voltage signal.

In the determination in step 112, "the operation number is MOV = 2", the flow proceeds to step 113, and in the determination in step 113, "since the wiper blade 50 has reached the upper reversing position C" step 114 And in step 114, “set motor stop”
Is executed.

If the initialization has been completed in step 300, step 400 of the constant interruption routine is executed. Therefore, in step 200 of the output routine, “set timer 2 to set XTM2” is executed and step 201 is executed. The process proceeds to step 202 because the determination in step 201 is “set motor stop” and the process proceeds to step 202.
A drive signal is given to the output driver 2 and the output driver 4 from the output block 45, and the FET2 and the FET4 are turned on. Therefore, an armature short current is supplied to the motor unit 3, and the armature shaft 14 is electromagnetically braked. Transition.

Since it is determined in step 203 that the motor is not set for normal rotation, the process proceeds from step 205 and step 207 to step 212, and step 21 is executed.
In the determination in 2, the output routine ends because "the motor reverse rotation deceleration has not been set".

After "set motor to stop" is executed in step 114 of the control routine, the process proceeds to step 115. In step 115, "set operation number MOV = 3" is executed, and the process proceeds to step 116. Step 1
In step 16, "set stop time XSTOP in timer 3 of microcomputer CPU" is executed and step 117 is executed.
Move to

Since the determination in step 117 is "operation number MOV = 3", the flow proceeds to step 118,
Since the timer 3 has not expired in the determination at 18, the process proceeds to steps 121, 129, 134, 141, and END, and returns to the beginning of the control routine.

If the initial setting is completed in step 300, step 400 of the constant interrupt routine is executed. Therefore, in step 200 of the output routine, "initialize timer 2. Set XTM2" is executed, and step 201 is executed. The processing proceeds to step 202 because the determination in step 201 indicates that the motor is to be stopped.
A drive signal is supplied to the output driver 2 and the output driver 4 to turn on the FET 2 and the FET 4, so that the motor unit 3 is kept stopped.

When the timer 3 of the microcomputer CPU has timed out, the process proceeds to step 119 since "timer 3 has timed out" in the determination at step 118, and "set to motor reverse rotation" is executed at step 119.

If the initial setting is completed in step 300, step 400 of the constant interrupt routine is executed. Therefore, in step 200 of the output routine, "initialize timer 2. Set XTM2" is executed and step 201 is executed. The processing proceeds to step 203 because the determination in step 201 is “not a motor stop set”.
The process proceeds to step 205 because the determination in step 203 is “not a set of forward rotation of the motor”.
In the determination in step 205, since the motor is set to the reverse rotation, the process proceeds to step 206, where drive signals are given to the output drivers 2 and 3 from the output block 45 of the microcomputer CPU.
Since the motor 3 is turned on, a current is supplied from the second brush 19 of the motor unit 3 to the first brush 18 to rotate the armature shaft 14 in the reverse direction.

After "set the motor to reverse rotation" is executed in step 119 of the control routine, the process proceeds to step 120. In step 120, "set operation number MOV = 4" is executed, and the process proceeds to step 121. .

When the pause time selected by the timer 3 ends, the armature shaft 14 of the motor section 3 starts to rotate in the reverse direction, so that the wiper blade 50 starts moving backward toward the lower turning position B.

When the wiper blade 50 continues to move backward, as shown in FIG. 9, the first contactor 31 of the rotation position detecting device 1 is not electrically connected to the contact plate 30, and the second contactor 32, the third contactor 33, and the fourth contactor 34 become high level. As a result, a voltage signal is given to the input filter block of the microcomputer CPU through the second conversion circuit 36 and the third conversion circuit 37. The wiper blade 50 moves backward in the deceleration region E from the upper turning position C.

In the determination in step 121, since "the operation number is MOV = 4," the flow proceeds to step 123, and in the determination in step 123, "the wiper blade 50 is not in the intermediate operation region."

In step 124, since "the wiper blade 50 is in the deceleration region", the flow proceeds to step 125, and in step 125, "FMOV is not set", so that the flow proceeds to step 129, step 134, step 141, and END. Then, the process returns to the beginning of the control routine.

When the wiper blade 50 continues to move backward, the first contactor 31 of the rotational position detecting device 1 is electrically connected to the contact plate 30 as shown in FIG. As a result, an electric signal is supplied to the input filter block of the microcomputer CPU through the second conversion circuit 36, and the wiper blade 50 moves in the intermediate region from the upper inversion position C to the lower inversion position B. Move back.

Since the operation number is MOV = 4 in the control routine, steps 100, 104, 11
2, Step 117, Step 121, Step 122
Then, the process proceeds to step 123, where "passage flag FMOV is set" because "it is in the intermediate operation region" in the determination at step 122. And step 124
Since it is determined that the area is not the deceleration area, the process proceeds to steps 129, 134, 141, and END, and returns to the beginning of the control routine.

When the wiper blade 50 continuing to move backward approaches the lower turning position B, the first contactor 31 of the rotational position detecting device 1 is cut off from the contact plate 30 as shown in FIG. Contactor 32 goes high.

In the determination in step 124, since "wiper blade 50 is in the deceleration region", step 1
25, the flow proceeds to step 126 since "passing flag FMOV is set" in the determination at step 125, and "set motor to reverse rotation deceleration" is executed at step 126, and the flow proceeds to step 127. At step 127, “reset of the passage flag FMOV” is executed, and the routine goes to step 128. In step 128, "set operation number MOV = 5" is executed, and the routine goes to step 129.

Since the wiper blade 50 moves backward while decelerating just before reaching the lower turning position B and reaches the lower turning position B, the first contactor of the rotational position detecting device 1 as shown in FIG. 31 is the contact plate 3
0, the second contactor 32,
The third contactor 33 goes low, resulting in
A voltage signal is applied to the input filter block of the microcomputer CPU through the second conversion circuit 36 and the third conversion circuit 37.

In the determination in step 129, the operation number is MOV = 5, so the flow proceeds to step 130. In the determination in step 130, "since the wiper blade 50 has reached the lower turning position B", step 131 And in step 131, “set to motor stop”
Is executed.

If the initialization in step 300 has been completed, step 400 of the constant interruption routine is executed. Therefore, in step 200 of the output routine, “set timer 2 to initialize XTM2” is executed and step 201 is executed. Then, the process proceeds to step 202 because the determination in step 201 is “set to stop the motor”.
A drive signal is supplied from the output block 45 of the CPU to the output driver 2 and the output driver 4, and the FET2 and the FET4 are turned on. Therefore, an armature short current is supplied to the motor unit 3, and the armature shaft 14 is electromagnetically braked. The wiper blade 50 stops at the lower turning position B,
Move to step 203.

The process proceeds from step 203 to step 205. Since it is determined in step 203 that "it is not the set of forward rotation of the motor", the process proceeds to step 205, and the determination of step 205 is not "set of reverse rotation of the motor". The process proceeds to step 207, where the determination in step 207 is "not a set of motor forward rotation deceleration", so the process proceeds to step 212, and the determination in step 212 is "not a set of motor reverse rotation deceleration", and the output routine ends. .

When the output routine is completed, the process proceeds from step 131 of the control routine to step 132. In step 132, "set stop time XSTOP in timer 3 of microcomputer CPU" is executed.
Move to 33.

In the step 133, "Operation number MOV = 6
Is executed, and the routine goes to step 134. Since it is determined in step 134 that the operation number is MOV = 6, the routine goes to step 135. When timer 3 of the microcomputer CPU times out, step 1
"Timer 3 has timed out" in the determination at 35
Therefore, the process shifts to step 136, and since the “operation switch SW is turned on” in the determination in step 136, the process shifts to step 137 to execute “set forward rotation of the motor”.

If the initial setting has been completed in step 300, step 400 of the constant interrupt routine is executed. Therefore, in step 200 of the output routine, "set timer 2 to initialize XTM2" is executed and step 201 is executed. The process proceeds to step 203 because the determination in step 201 is "not a motor stop set", and the process proceeds to step 203. Since the determination in step 203 is "motor forward rotation set", the process proceeds to step 204 to output the output block of the microcomputer CPU. 45, a drive signal is given to the output driver 1 and the output driver 4, and the
1. Since the FET 4 is turned on, the armature shaft 14 of the motor unit 3 starts rotating forward.

Since the determination in step 203 is "set the motor to rotate forward", steps 205 and 2
Then, the process proceeds from step 07 to step 212, and the output routine ends because "the motor reverse rotation deceleration has not been set" as determined in step 212.

The process moves from step 137 of the control routine to step 138, and in step 138, the "operation number"
MOV = 1 set "is executed, and the routine goes to step 141. In the determination in step 141, “the operation number is MOV =
7, the routine returns to step 100 and the routine is executed again. Therefore, the wiper blade 50 is kept in the lower turning position B while the operation switch SW is turned on.
And reciprocate continuously between the upper reversal position C.

At this time, if the operation switch SW has been turned off, the process proceeds to step 139 because "the operation switch SW has not been turned on" in the determination at step 136, and proceeds to "set motor reverse rotation" at step 139. Is executed.

If the initial setting has been completed in step 300, step 400 of the constant interrupt routine is executed. Therefore, in step 200 of the output routine, "set timer 2 to initialize XTM2" is executed, and step 201 is executed. The process proceeds to step 203 because the determination in step 201 is "not a motor stop set" and the process proceeds to step 203. Since the determination in step 203 is "not a motor forward rotation set", the process proceeds to step 205 and proceeds to step 205. In the discrimination, because the motor is set to the reverse rotation, the process proceeds to step 206, where the drive signal is given to the output driver 2 and the output driver 3 from the output block 45 of the microcomputer CPU.
Is turned on, a current is supplied from the second brush 19 of the motor unit 3 to the first brush 18, the armature shaft 14 is rotated in the reverse direction, and the routine proceeds to step 207.

In the determination in step 207, "it is not the setting of the motor normal rotation deceleration", the process proceeds to step 212, and in the determination in step 212, "it is not the setting of the motor reverse rotation deceleration", the output routine ends.

The process moves from step 139 of the control routine to step 140, and in step 140, the "operation number"
MOV = 7 is set ", and the routine goes to Step 141.

Since the armature shaft 14 of the motor section 3 starts to rotate in the reverse direction, the wiper blade 50 starts moving downward from the lower turning position B. When the wiper blade 50 reaches the storage position A, it is shown in FIG. From the state shown in FIG. 5, the second contactor 32 goes high while the first contactor 31 of the rotational position detecting device 1 is still electrically connected to the contact plate 30, and as a result, A voltage signal is applied to the input filter block of the microcomputer CPU through the second conversion circuit 36.

In the determination in step 141, the operation number is MOV = 7, so the flow proceeds to step 142. In the determination in step 142, the wiper blade 50 has reached the storage position A, so that the flow proceeds to step 143. The process proceeds to “set motor stop”.

When the motor stop is set, “timer 2 is initialized XTM2” in step 200 of the output routine.
Is executed, and the process proceeds to step 201. Since the determination in step 201 is "set to stop the motor", the process proceeds to step 202. In step 202, the output driver 45 outputs the output signal from the output block 45 of the microcomputer CPU. Since a drive signal is given to the driver 4 and the FET 2 and the FET 4 are turned on, an armature short current is supplied to the motor unit 3 to electromagnetically brake the armature shaft 14, the wiper blade 50 stops at the storage position A, and step 203. Move to

The process proceeds from step 203 to step 205. Since it is determined in step 203 that "the motor is not set for normal rotation", the process proceeds to step 205. The process proceeds to step 207, where the determination in step 207 is "not a set of motor forward rotation deceleration", so the process proceeds to step 212, and the determination in step 212 is "not a set of motor reverse rotation deceleration", and the output routine ends. .

The process shifts from step 143 to step 144 in the control routine, and in step 144, the "operation number"
"Set MOV = 0" is executed, and the routine returning to step 100 is repeatedly executed.

[0110]

As described above, according to the rotational position detecting device for a wiper motor according to the first aspect of the present invention, the contactor is located on the wiping area with respect to the contact plate having the wiping area and the deceleration area. And a wiper drive reference signal is generated. When the contactor is in the deceleration region, a wiper deceleration reference signal is generated. Therefore, since the wiping angle is determined based on the detection signal of a single contactor, an error does not occur in the detection accuracy due to a variation in the mounting position of the contactor. Therefore, there is an excellent effect that stable control can be performed by detecting the wiping angle with high accuracy using a single contactor.

According to the wiper motor rotational position detecting device according to the second aspect of the present invention, the deceleration area of the contact plate is arranged as a pair in the wiping area. Therefore,
There is an excellent effect that both a reverse deceleration region of upward inversion and a deceleration region of downward inversion can be configured as a detection signal of a single contactor.

According to the rotational position detecting device for a wiper motor according to the third aspect of the present invention, since the contactor is connected to the ground, the contact plate is electrically connected to the contactor so that the contact plate is grounded. You. Therefore, there is an excellent effect that a simple circuit configuration is used to configure a control circuit that uses the potential of the contactor as a trigger.

According to the wiper motor rotational position detecting device according to the fourth aspect of the present invention, the principle area of the contact plate is such that the contactor is released from the grounded state and the other contactor is in contact with the contact plate and grounded or opened. If the contact position of the contactor and the other contactor is always within the range of the deceleration area because the signal is always at a high level, the angle of the deceleration area does not change at all, and the wiping angle using a single contactor An excellent effect that stable control can be performed by performing the detection with high accuracy is achieved.

According to the rotational position detecting apparatus for a wiper motor according to the fifth aspect of the present invention, the second contactor detects that the wiper blade has reached the retracted position. Therefore, there is an excellent effect that the rise-up function is realized with a simple structure.

According to the rotational position detecting device for a wiper motor according to the sixth aspect of the present invention, when the third and fourth contactors detect that the wiper blade is located in the intermediate operating region in the wiping region, the deceleration control is performed. The logic for performing is configured. Therefore, there is an excellent effect that the deceleration control is easily performed.

According to the wiper motor rotational position detecting device according to the seventh aspect of the present invention, the deceleration area of the contact plate is released when the contactor is released from the grounding state, and the other contactors are released from the contact plate and the grounding and releasing state. Instead, by always being a high level signal, if the displacement of the mounting position of the contactor for detecting the upper inversion position and the contactor for detecting the lower inversion position is within the range of the deceleration area,
There is no change in the angle of the deceleration region, and an excellent effect that stable control can be performed by detecting the wiping angle with high accuracy using a single contactor is achieved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment of a wiper motor rotational position detecting device according to the present invention.

FIG. 2 is a partially cutaway front view of the wiper motor in which the wiper motor rotational position detecting device shown in FIG. 1 is used.

FIG. 3 is a longitudinal sectional side view of the wiper motor shown in FIG. 2;

FIG. 4 is a front view showing a relationship between a contactor and a contact plate in the wiper motor shown in FIG.

FIG. 5 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 6 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 7 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 8 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 9 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 10 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 11 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 12 is an explanatory diagram of a state of a contactor and a contact plate in the rotational position detecting device of the wiper motor shown in FIG. 1;

13 is an explanatory diagram of a state of a contactor and a contact plate in the wiper motor rotational position detection device shown in FIG. 1;

FIG. 14 is a schematic diagram illustrating a relationship between a contactor and a contact plate in the rotational position detection device of the wiper motor illustrated in FIG. 1;

FIG. 15 is an explanatory diagram showing a potential of a contactor in the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 16 is a flowchart of a control operation using the wiper motor rotational position detecting device shown in FIG. 1;

FIG. 17 is a flowchart of a control operation using the wiper motor rotational position detecting device shown in FIG. 1;

FIG. 18 is a flowchart of a control operation using the rotational position detecting device of the wiper motor shown in FIG. 1;

FIG. 19 is a flowchart of a control operation using the wiper motor rotational position detecting device shown in FIG. 1;

FIG. 20 is a flowchart of a control operation using the wiper motor rotational position detecting device shown in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotation position detecting device of wiper motor 2 wiper motor 11 output shaft 30 contact plate 30a2, E (deceleration region) first non-conduction region 30a3, F (deceleration region) second non-conduction region 31 (contactor) first contactor 32 Second contactor 33 Third contactor 34 Fourth contactor 50 Wiper blade D Wiping area

Continued on the front page F term (reference) 3D025 AA01 AC01 AD01 AE02 AE57 AG02 AG21 AG78 5G025 AA05 AA12 BA08 CA05 DA10 FA04

Claims (7)

[Claims] A wiper motor for reciprocating a wiper blade by forward / reverse rotation; a wiper motor coupled to an output shaft provided on the wiper motor, rotating together with the output shaft, and being predetermined according to a wiping angle of the wiper blade. A contact plate having a range of wiping regions and a deceleration region disposed on the wiping region; and a wiper drive reference signal disposed on the contact plate and being located on the wiping region of the contact plate. On the other hand, a rotational position detecting device for a wiper motor, comprising a single contactor for generating a wiper deceleration reference signal when the contact plate is on a deceleration region of the contact plate. 2. The rotational position detecting device for a wiper motor according to claim 1, wherein a deceleration region of the contact plate is arranged in a pair within the wiping region. 3. The wiper motor rotational position detecting device according to claim 2, wherein the contact plate is connected to ground. 4. The rotational position detecting device for a wiper motor according to claim 1, wherein a signal is formed in the deceleration region of the contact plate when grounding is released. 5. The wiper motor rotational position detecting device according to claim 1, further comprising a second contactor for detecting that the wiper blade has reached the retracted position. 6. The rotation of the wiper motor according to claim 1, further comprising a third contactor and a fourth contactor for detecting that the wiper blade is located in the intermediate operation area in the wiping area. Position detection device. 7. The rotational position of the wiper motor according to claim 1, wherein the contact point between the third and fourth contactors is switched within the deceleration region of the contact plate. Detection device.