JP2003054371A - Wiper controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper controller allowing reducing reversing sounds when a wiper blade reverses. SOLUTION: This wiper controller 1 has a wiper arm 3 reciprocatingly swinging on unwiped parts with reversing at a reversing position by rotation of an output shaft 2c of a wiper motor 2 and a wiper 5 having the wiper blade 4 fixed on the wiper arm 3. When the wiper arm 3 being moving toward the reversing position reaches a coasting starting position selected near the reversing position according to speed of the wiper arm 3 and voltage level of a power source 55, an armature short circuit formed in the wiper motor 2 is broken so as to coast the wiper arm 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper control device for controlling a wiper for wiping a windshield glass of an automobile.

[0002]

2. Description of the Related Art As a wiper control device of this type, there is known a device in which a wiper arm is connected to an output shaft of a wiper motor and a wiper blade is attached to the wiper arm.

[0003]

However, in the above wiper control device in which the link device for driving the wiper blade is abolished, there is no speed fluctuation peculiar to the link device at the reversing position, so that it can be stopped smoothly. However, there is a problem that the speed control of the wiper arm and the wiper blade is required.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wiper control device capable of smoothly stopping a wiper blade.

[0005]

[Constitution of the invention]

[0006]

In a wiper control device according to a first aspect of the present invention, a wiper motor having an output shaft that rotates normally and reversely when energized, and a wiper motor that is connected to the output shaft of the wiper motor and rotates the output shaft. , A wiper arm that has a wiper arm that swings back and forth on the wiping surface while reversing at the reversing position on the wiping surface, has a wiper blade that is attached to the wiper arm and is pressed against the wiping surface, and a drive electrically connected to the wiper motor Stage, a central processing circuit connected to the power supply, connected to the drive stage, and a wiper switch electrically connected to the central processing circuit, the intermittent mode, the continuous mode is selected respectively, the central processing circuit, The wiper arm moving towards the inversion position has a coasting start position selected near the inversion position depending on the speed of the wiper arm and the voltage level of the power supply. Upon reaching, it is characterized in that the arrangement for blocking the armature short circuit formed on the wiper motor so as to coast the wiper arm.

In the wiper control device according to claim 2 of the present invention, in addition to the configuration of claim 1, the central processing circuit selects the coasting start position to an early position when the voltage level of the power supply is high. The feature is that the coasting start position is selected to a slow position when the voltage level of the power supply is low.

According to a third aspect of the present invention, in addition to the structure of the first or second aspect, the switching stage is arranged in the energizing path of the driving stage, and the switching stage is turned off to drive the driving stage. It is characterized in that it is configured to cut off the ground path of.

In the wiper control device according to a fourth aspect of the present invention, in addition to the configuration of the first, second or third aspect, the central processing circuit includes a voltage determination section for detecting the voltage of the power supply to obtain voltage data. A speed determination unit that detects the speed of the wiper arm,
It is characterized in that a coasting start calculation unit for controlling the switching stage based on the voltage data of the voltage determination unit and the speed data of the speed determination unit is incorporated.

In the wiper control device according to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect, the central processing circuit is based on the voltage data of the voltage determination section and the speed data of the speed determination section, and the reversal target of the wiper arm. The feature is that the position is selected.

[0011]

In the wiper control device according to the present invention, the central processing circuit selects the wiper arm moving toward the reversal position near the reversal position according to the speed of the wiper arm and the voltage level of the power supply. When the coasting start position is reached, the armature short circuit formed in the wiper motor is cut off so as to coast the wiper arm.
Therefore, the speed of the wiper blade becomes slower at the reverse position.

[0012]

DETAILED DESCRIPTION OF THE INVENTION

[0013]

1 to 6, there is shown an embodiment of a wiper control device according to the present invention. The illustrated wiper control device 1 mainly includes a wiper motor 2, a wiper 5 having a wiper arm 3 and a wiper blade 4, a drive stage 6 including first and second relays RL1 and RL2, a central processing circuit 7, a wiper switch 8, It consists of a switching stage 9.

The wiper motor 2 is a two-brush DC motor, and the first brush terminal 2a is connected to the first movable contact RL1-1 provided on the first relay RL1 of the drive stage 6,
The second brush terminal 2b is the second relay RL2 of the drive stage 6.
Are respectively connected to the second movable contacts RL2-1. The armature shaft 2c included in the wiper motor 2 is directly coupled to the pivot shaft 5a included in the wiper 5. Therefore, no link is arranged between the wiper motor 2 and the wiper 5. The pivot shaft 5a is screwed to the base end of the wiper arm 3 provided on the wiper 5.

The wiper motor 2 has a first brush terminal 2a.
When a current is supplied from the second brush terminal 2b to the second brush terminal 2b,
The armature shaft 2c rotates in the positive direction to rotate the wiper arm 3
When the wiping surface 50 is moved from the lower reversal position A1 to the upper reversal position A2 and a current is supplied from the second brush terminal 2b to the first brush terminal 2a, the armature shaft 2c rotates in the opposite direction. A normal wiping operation is performed in which the wiper arm 3 is moved from the upper reversal position A2 of the wiping surface 50 to the lower reversal position A1. In the wiper motor 2, when the wiper arm 3 is in the lower reversal position A1, current is supplied from the second brush terminal 2b to the first brush terminal 2a, whereby the armature shaft 2c rotates in the opposite direction and the wiper arm 2 rotates. The storing operation of moving 3 from the lower reversal position A1 of the wiping surface 50 to the lower storing position A3 is performed.

The wiper motor 2 has a built-in origin switch 10. The origin switch 10 is the wiper arm 3
When it reaches the storage position A3, it is turned on to generate a position signal. The position signal generated by the origin switch 10 is given to the central processing circuit 7 through the first filter 11. A rotation signal generator 12 is built in the wiper motor 2. The rotation signal generator 12 includes a magnet fixed to the armature shaft 2c and first and second Hall elements (Hall IC) H arranged around the magnet in a non-contact manner.
It consists of A and HB. The rotation signal generator 12 generates electric signals from the first and second Hall elements HA and HB according to the rotation of the armature shaft 2c by the rotation of the magnet together with the armature shaft 2c, and the signals are converted into pulses. Then, it is given to the central processing circuit 7.

A wiper blade 4 is attached to the tip of the wiper arm 3. In the wiper 5, the armature shaft 2c of the wiper motor 2 is rotated in the forward direction so that the wiper arm 3 performs a forward wiping operation from the lower reversal position A1 of the wiping surface 50 toward the upper reversal position A2, and at the same time, the armature of the wiper motor 2 is moved. When the shaft 2c rotates in the opposite direction, the wiper arm 3 performs a backward wiping operation from the upper reversal position A2 of the wiping surface 50 to the lower reversal position A1,
The wiper blade 4 is pressed against the wiping surface 50 and reciprocates to wipe the wiping surface. The upper reversal position A2 and the lower reversal position A1 of the wiper arm 3 are appropriately changed as shown in FIG. 2 by the calculation data obtained by calculating the speed data of the wiper arm 3 and the current position data of the wiper arm 3. It is expressed as an upper reversal target position A2-1 and a lower reversal target position A1-1. Further, a fixed value of the upper forced stop position A2-2, which is a limit position for reversing the wiper arm 3 upward, is defined ahead of the upper reversal target position A2-1, and ahead of the lower reversal target position A1-1. , A lower forced stop position A1-2 of a fixed value that is the limit position for reversing the wiper arm 3 downward
Has been defined.

The first relay RL1 of the drive stage has a first movable contact RL1-1, a first relay coil RL1-2 having one end connected to the power supply 55 and the other end connected to a central processing circuit,
First normally closed fixed contacts RL1-3 connected to the power supply 55
And a first normally open fixed contact RL1-4 connected to the drain D of the switching stage 9. The second relay RL2 of the drive stage is paired with the first relay RL1 to form a second movable contact RL2-1, a second relay coil RL2-2, a second normally closed fixed contact RL2-3, Second normally open fixed contacts RL2-4 are respectively provided. First
When the relay RL1 is turned on, the second normally-closed fixed contact RL2-3 and the second movable contact RL2 of the second relay RL2.
-1, through the second brush terminal 2b of the wiper motor 2, the first brush terminal 2a, the first movable contact RL1-1 of the first relay RL1, the first normally open fixed contact RL1-4, and the switching stage 9 By forming the energizing circuit,
The armature shaft 2c of the wiper motor 2 is rotated in the positive direction. On the contrary, when the second relay RL2 is turned on, the first normally closed fixed contact RL1 of the first relay RL1 is turned on.
-3, first movable contact RL1-1, first brush terminal 2a of wiper motor 2, second brush terminal 2b, second movable contact RL2-1 of second relay RL2, second normally open fixed By forming an energizing circuit through the contact points RL2-4 and the switching stage 9, the armature shaft 2c of the wiper motor 2 is rotated in the opposite direction. In the first and second relays RL1 and RL2, the wiper arm 3 is in the upper inverted position A2.
Switching is performed at the timing when the lower reversal position A1 is reached.

The central processing circuit (microcomputer) 7 includes a position detector 7a, a voltage determiner 7b, a speed determiner 7c, a coasting start calculator 7d, a first timer (timer 1) TM1 and a second timer ( Timer 2) TM2, third timer (timer 3)
TM3 is built in. The position detector 7a obtains the current position data of the wiper arm 3 based on the electric signal supplied from the rotation signal generator 12. The voltage determination unit 7b determines the motor voltage given through the filter FILTER. The speed determination unit 7c obtains speed data of the wiper arm 3 from the current position data obtained by the position detection unit 7a and the elapsed time. The coasting start calculation unit 7d includes a speed determination unit 7c.
The coasting start position is calculated from the speed data of the wiper arm 3 obtained by the above and the current position data of the wiper arm 3 obtained by the position detector 7a. First timer TM1
Measures the time from when the first relay RL1 or the second relay RL2 is turned on to when the switching stage 9 is turned on. The second timer TM2 measures the time until the wiper arm 3 is inverted when it reaches the upper inverted position A2 or the lower inverted position A1. The third timer TM3 measures the intermittent pause time set when the intermittent switch 8b of the wiper switch 8 is turned on.

The central processing circuit 7 turns on the first relay RL1 until the wiper arm 3 reaches the upper reversal position A2 when the continuous switch 8a is turned on.
When the wiper arm 3 reaches the upper reversal position A2, the first relay RL1 is turned off and the second relay RL2 is turned on,
When the wiper arm 3 reaches the lower reversal position A1, the control operation of turning off the second relay RL2 and turning on the first relay RL1 is continuously performed.

The central processing circuit 7 turns on the first relay RL1 until the wiper arm 3 reaches the upper reversal position A2 when the intermittent switch 8b is turned on.
When the wiper arm 3 reaches the upper reversal position A2, the first relay RL1 is turned off with the intermittent down time set by the third timer TM3, and the second relay RL2 is turned on after the intermittent down time is completed. Then, when the wiper arm 3 reaches the lower reversal position A1, the second relay RL2 has the intermittent rest time set by the third timer TM3.
Is turned off, and the control operation for turning on the first relay RL1 is continuously performed when the intermittent rest time ends.

As shown in FIG. 3, the central processing circuit 7 uses the voltage data obtained from the voltage determination section 7b to
The coasting start position calculated by the coasting start calculation unit 7d is corrected. At this time, 9, 10, 11, 12,
Corrections are made according to voltage data at 13, 14, 15, 16 volts (V). More specifically, the voltage determination unit 7
When the voltage data obtained from b is a value lower than 12 volts (V), the speed of the wiper arm 3 is slow, so the coasting start position is slow. On the contrary,
When the voltage data has a value higher than 12 volts (V), the coasting start position becomes faster.

When the continuous switch 8a or the intermittent switch 8b is turned off, the central processing circuit 7 turns on the second relay RL2 until the wiper arm 3 reaches the lower reversal position A1, and thereafter. , Wiper arm 3
Keeps turning on the second relay RL2 until reaches the storage position A3, and when the wiper arm 3 reaches the storage position A3, turns off the second relay RL2.

The wiper switch 8 is a continuous switch (ON
SW) 8a and an intermittent switch (INTSW) 8b. The continuous switch 8a is turned on to give a continuous command signal to the central processing circuit 7 through the second filter 13. The intermittent switch 8b is turned on to give an intermittent command signal to the central processing circuit 7 through the second filter 13.

The switching stage 9 is an FET, whose gate G is connected to the central processing circuit and whose source S is grounded. The switching stage 9 is turned on when the first relay RL1 or the second relay RL2 is turned on, and then obtained from the speed data of the wiper arm 3 and the current position data of the wiper arm 3 by calculation. It is turned off by the central processing circuit based on the operation data.
When the switching stage 9 is turned off while the first relay RL1 is turned on, the switching stage 9 shuts off the ground circuit of the normally open fixed contact RL1-4 of the first relay RL1,
The armature short circuit generated through the first and second brush terminals 2a and 2b of the wiper motor 2 is interrupted, and the armature shaft 2c of the wiper motor 2 is coasted in the forward rotation direction. When the switching stage 9 is turned off while the second relay RL2 is turned on, the switching stage 9 shuts off the ground circuit of the normally open fixed contact RL2-4 of the second relay RL2, so that Second
The armature short circuit generated through the brush terminals 2a and 2b is cut off to allow the armature shaft 2c of the wiper motor 2 to coast in the reverse rotation direction. As shown in FIG. 2, the armature shaft 2c of the wiper motor 2 is disposed in front of the forward reverse coasting area B1 arranged before the upper reverse target position A2-1 and before the lower reverse target position A1-2. It is coasted with the coasting area B2 during reverse rotation.

The wiper control device 1 as described above performs the control operation based on the time charts shown in FIG. 4 and the flow charts shown in FIGS. 5 and 6. 5 is a main routine, and FIG. 6 is an interrupt routine.

At time T1, when the ignition switch IGNSW is turned on with the wiper arm 3 being in the storage position A3 and the continuous switch 8a being off, the origin switch 10 is turned on and the wiper storage confirmation signal is sent to the central processing circuit 7. Given to. At this time, the first and second
Since both relays RL1 and RL2 are off, the wiper motor 2 is not operated. When the ignition switch IGNSW is turned on, the program shown in FIG. 5 is started, "initial setting" is executed in step 100, the process proceeds to step 101, and "voltage detection" is executed in step 101. Then, the process proceeds to step 102, and in step 102, "the continuous switch 8a is not turned on, that is, ONS.
Since it is determined that "W = ON", the process proceeds to step 103, and in step 103, it is determined that "the intermittent switch 8b is not turned on, that is, INTSW = ON", so the process proceeds to step 104, and the step At 104, "origin switch 10 is not off,
That is, since it is determined that the origin SW is not OFF ", the process proceeds to step 105," measure the moving speed of the wiper arm 3 and store the speed data "is executed in step 105, and the process proceeds to step 106. “Measure program cycle time” at 106
Is executed. Step 106 is repeatedly executed until the program cycle time is up, and when the program cycle time is up, the routine returns to step 101 and this routine is repeated.

At time T2, when the continuous switch 8a is turned on, it is determined that "the continuous switch 8a is turned on" in step 102 which has been shifted through step 101. Therefore, the routine proceeds to step 107, and step 107 In ", continuous processing" is executed, and steps 105 and 106 are executed. Since the central processing circuit 7 performs the continuous processing, the first relay RL
1 is turned on at time T3, the switching stage 9 is turned on at time T4, and current is supplied from the second brush terminal 2b of the wiper motor 2 to the first brush terminal 2a at time T4, whereby the armature of the wiper motor 2 is supplied. Axis 2
Since c is rotated in the forward direction, the wiper arm 3 starts to move from the storage position A3 toward the lower reversal position A1 and the wiper arm 3 separates from the storage position A3.
When 0 is turned off and the armature shaft 2c rotates, the first Hall element HA of the rotation signal generator 12 generates an electric signal. At time T5, switching stage 9 is turned off, and at time T6 switching stage 9 is turned on again. After the time T4, the second Hall element HB of the rotation signal generator 12 also generates an electric signal.

The armature shaft 2c of the wiper motor 2 starts to rotate, and the first hall element HA of the rotation signal generator 12 is started.
If there is a rising edge of the pulse signal, the "reading of the pulse signal from the rotation signal generator 12, that is, the reading of the Hall IC" is executed in step 200 of the interrupt routine, and the process proceeds to step 201, and step 2
In 01, "the current position of the wiper arm 3 is detected by the position detecting section 7a of the central processing circuit 7, that is, the wiper arm position determination" is executed, and the process proceeds to step 202. In step 202, "the continuous switch 8a of the wiper switch 8 is The reading that the switch is turned on, that is, the SW reading is executed and the process proceeds to step 203. Since it is determined in step 203 that "the armature shaft 2c of the wiper motor 2 is rotating forward", the process proceeds to step 204. In step 204, "a flag (REQ for keeping the first relay RL1 ON.
RL1 ON) and reset the flag (REQ RL2 ON) for keeping the second relay RL2 OFF ”are executed and the process proceeds to step 205. In step 205,“ speed data of wiper arm 3
"Calculate the coasting start position from the current position data of the wiper arm 3 and the voltage determination value" is executed and step 206
Move to. In step 206, it is determined whether or not the wiper arm 3 is in the area to coast. At this time, since the wiper arm 3 is moving away from the storage position A3 toward the lower reversal position A1, it is determined in step 206 that the wiper arm 3 is not in the coasting area, and thus step 20 is performed.
7, the flag for turning on the switching stage 9 (REQ FET ON) is entered in step 207.
Is set "is executed and the process proceeds to step 208,
Since it is determined in step 208 that "the flag for turning on the switching stage 9 is set", the process proceeds to step 209, in which "turning on the switching stage 9" is executed and step 21
0, and in step 210, "first relay R
Since it is determined that the flag for keeping L1 turned on has been set ", the routine proceeds to step 211, where" keep the first relay RL1 on "is executed at step 211 and the routine proceeds to step 212. , Step 2
Since it is determined in step 12 that "the flag for keeping the second relay RL2 turned on is not set", the process proceeds to step 213, and in step 213, "second
"Keep relay RL2 off" is executed and the process returns to step 200.

Steps 101, 102, 107, 105 and 106 are repeatedly executed, and steps 200 and 20 are executed.
1, step 202, step 203, step 20
4, step 205, step 206, step 20
7, step 208, step 209, step 21
0, step 211, step 212, step 213
Is repeatedly executed, and the wiper arm 3 soon approaches the upper inverted position A2 at time T7. Step 20
0, step 201, step 202, step 20
3, step 205 that has moved through step 204
At wiper arm 3 speed data wiper arm 3
According to the calculation data obtained by calculating from the current position data and the voltage determination value of, it is determined in step 206 that "the coasting region (coasting region B1 during forward rotation) has been entered", so the routine proceeds to step 214, In step 214, "reset the flag for turning on the switching stage 9" is executed, and the process proceeds to step 208. In step 208, it is determined that "the flag for turning on the switching stage 9 is reset". Therefore, the process proceeds to step 215, the "switching stage 9 is turned off" is executed in step 215, and the process proceeds to step 210, in which the "flag for keeping the first relay RL1 turned on" is set. Therefore, the process proceeds to step 211, and in step 211, the “first relay Maintaining the ON RL1 "is executed the process proceeds to step 212, in step 212" Step 21 because the flag is determined as "not set for keeping ON the second relay RL2
3 and at step 213, "second relay R
"Keep L2 off" is executed and the process returns to step 200. Since the switching stage 9 is turned off while the first relay RL1 remains in the on state, the first relay RL1 has the first normally open fixed contact. The ground path of the RL1-4 is cut off, and as a result, the armature shaft 2c of the wiper motor 2 moves to the time T.
Starting to coast from 7, the wiper arm 3 reaches the upper reversal target position A2-1 at time T8 while decelerating.

When the wiper arm 3 reaches the upper reversal target position A2-1 at the time T8, the first relay RL1 is turned off, and the second relay RL2 is turned on at the time T9, so that the switching stage 9 is turned on. , By supplying the current from the first brush terminal 2a of the wiper motor 2 to the second brush terminal 2b, the time T1
At 0, since the armature shaft 2c of the wiper motor 2 is rotated in the opposite direction, the wiper arm 3 starts the backward movement from the upper reversal target position A2-1 to the lower reversal target position A1-1. In step 200 of the interrupt routine, "reading of pulse signal from the rotation signal generator 12, that is, reading of Hall IC" is executed, and the process proceeds to step 201. In step 201, "the position detection unit 7a of the central processing circuit 7 wipes the wiper arm. Detect the current position of 3,
That is, the "wiper arm position determination" is performed and the process proceeds to step 202. In step 202, "reading that the continuous switch 8a of the wiper switch 8 is turned on, that is, SW reading" is performed and the process proceeds to step 203. Since it is determined in step 203 that "the armature shaft 2c of the wiper motor 2 is not rotating normally", the process proceeds to step 218, and in step 218 it is determined that "the armature shaft 2c of the wiper motor 2 is rotating in the reverse direction". So move to step 219,
In step 219, "reset the flag (REQ RL1 ON) for keeping the first relay RL1 ON, and set the flag (REQ RL2 ON) for keeping the second relay RL2 ON" are executed. Then, the routine proceeds to step 205, where "calculate the coasting start position from speed data of wiper arm 3, current position data of wiper arm 3 and voltage determination value" is executed at step 205 and then the routine proceeds to step 206. In step 206, it is determined whether or not the wiper arm 3 is in the area to coast. At this time, the wiper arm 3
The lower reversal target position A1 apart from the upper reversal target position A2-1
Since it is moving toward -1, it is determined in step 206 that "the coasting area is not reached", and therefore step 207
Then, in step 207, “switching stage 9
"Set flag (REQFET ON) to turn on" is executed and the process proceeds to step 208, and it is determined in step 208 that "the flag to turn on switching stage 9 is set", so step 209 Then, in step 209, "turning on the switching stage 9" is executed, and then step 210 is performed. In step 210, "first relay RL1"
Flag is not set to keep on "
Therefore, the process proceeds to step 216 and step 2
At 16 "Maintain OFF of the first relay RL1"
Is executed, the process proceeds to step 212, and step 212
Is determined as "the flag for keeping the second relay RL2 turned on is set", the routine proceeds to step 217, where "maintain the second relay RL2 kept on" is executed at step 217. Step 20
Return to 0.

Steps 101, 102, 107, 105, and 106 are repeatedly executed, and steps 200 and 20 are performed.
1, step 202, step 203, step 21
8, step 219, step 205, step 20
6, step 207, step 208, step 20
9, step 210, step 211, step 21
2, the step 213 is repeatedly executed, and the wiper arm 3 eventually reaches the lower reversal target position A1 at time T11.
Approaching -2. Calculations obtained by calculation from the speed data of the wiper arm 3, the current position data of the wiper arm 3 and the voltage determination value in step 205 which has moved through step 200, step 201, step 202, step 203, step 218 and step 219. Since it is determined from the data in step 206 that "the coasting region (coasting region B1 during forward rotation) has entered", the process proceeds to step 214, and in step 214 the "flag for turning on the switching stage 9 is reset." Is executed and the process proceeds to step 208, and in step 208 it is determined that the "flag for turning on the switching stage 9 is reset", so the process proceeds to step 215, and in step 215 "switching stage 9 is turned off". Is executed and step 21 Then, in step 210, it is determined that the "flag for turning on the first relay RL1 is not set", so the process proceeds to step 216, and in step 216 "turn off the first relay RL1." “Maintain” is executed and the process proceeds to step 212. Since it is determined in step 212 that “the flag for keeping the second relay RL2 on” is set, the process proceeds to step 217.
In step 217, “maintain second relay RL2 ON” is executed, and the process returns to step 200. Since the switching stage 9 is turned off while the second relay RL2 remains in the ON state, the grounding path of the second normally open fixed contact RL2-4 of the second relay RL2 is cut off, and as a result, the wiper motor 2 The armature shaft 2c begins to coast at time T11, and the wiper arm 3 is decelerated at time T12.
At, the vehicle reaches the lower reversal target position A1-1.

Time T13 and time T1 after time T12
4, at time T15 and time T16, control is performed in the same manner as described above, and the wiper arm 3 moves to the upper reversal target position A2.
The continuous switch 8a of the wiper switch 8 at time T17 when the wiper switch 8 is returning from -1 toward the lower reverse target position A1-1.
Is turned off, "the continuous switch 8a is turned off" in step 102 after the step 101.
Therefore, the process proceeds to step 103, and step 1
In 03, "intermittent switch 8b is not turned on"
Therefore, the process proceeds to step 104, and step 1
Since it is determined in "04" that "origin switch 10 is off", the routine proceeds to step 109, and "store processing" is executed in step 109 to execute step 10
5, step 106 is executed. The central processing circuit 7
Since the storing process is executed, the wiper arm 3 is returned to continue until the time T19 when the wiper arm 3 reaches the lower reversal target position A1-2, so that the second relay RL2 is kept on, and from time T20. , The speed of the switching stage 9 is controlled. As a result, the second relay RL2 continues to be turned on, and the wiper arm 3 moves to the lower reverse target position A1.
-2 to the storage position A3 and then stops. The process proceeds from step 200, step 201, step 202 to step 203, and from step 203 to step 218.
Then, in step 220, the flag for resetting the first relay RL1 is reset, the second relay R
Reset flag for turning on L2 and reset flag for turning on the switching stage 9 "are executed. Step 208, Step 215, Step 21
0, step 216, step 212, step 213
Is executed.

When the intermittent switch 8b of the wiper switch 8 is turned on, the process proceeds from step 101 to step 10
2, it is determined that "the continuous switch 8a is turned off", so that the process proceeds to step 103, and step 103
Since it is determined that "the intermittent switch 8b is turned on" in step 108, the process proceeds to step 108, and "intermittent processing is performed" is executed in step 108 and step 10
5, the routine of shifting to step 106 is repeatedly executed, and the upper reversal target position A2-1 and the lower reversal target position A1-
In each of the above cases, the operation in which the wiper arm 3 is intermittently stopped after a predetermined rest time is added to the case of the continuous switch 8a, and the same control is performed.

As described above, while the wiper arm 3 is moving toward the upper reversal target position A2-1, the speed data of the wiper arm 3 obtained by the speed determination unit 7c and the current position of the wiper arm 3 obtained by the position detection unit 7a are obtained. While reaching the upper reversal target position A2-1 while coasting in the forward rotation coasting region B1 obtained by being calculated by the coasting start calculation unit 7d from the position data and the voltage determination value, the lower reversal target position A1 is also reached. On the way to -1, it is calculated by the coasting start calculation unit 7d from the speed data of the wiper arm 3 obtained by the speed determination unit 7c, the current position data of the wiper arm 3 obtained by the position detection unit 7a, and the voltage determination value. The lower reverse target position A1-1 is reached while coasting in the obtained reverse coasting area B2. Therefore, the speed of the wiper arm 3 becomes slower near the upper reversal position A2 and the lower reversal position A1, so that the wiper arm 3 can be smoothly stopped.

[0036]

As described above, according to the wiper control device of the present invention, in the central processing circuit, the wiper arm moving toward the reversal position is controlled according to the speed of the wiper arm and the voltage level of the power supply. When the coasting start position selected near the reverse position is reached, the armature short circuit formed in the wiper motor is cut off so as to coast the wiper arm. Therefore, there is an excellent effect that the wiper blade can be smoothly stopped at the reverse position.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of a wiper control device according to the present invention.

FIG. 2 is an explanatory diagram of a wiper wiping range in the wiper control device shown in FIG.

FIG. 3 is a characteristic diagram of a motor speed and a coasting start position in the wiper control device shown in FIG.

FIG. 4 is a time chart illustrating a time-based control operation of the wiper control device shown in FIG.

5 is a flowchart illustrating a control operation of the wiper control device shown in FIG.

FIG. 6 is a flowchart illustrating a control operation of the wiper control device shown in FIG.

[Explanation of symbols]

1 Wiper control device 2 Wiper motor 2c (Output shaft) Armature shaft 3 Wiper arm 4 wiper blade 5 wiper 7 Central processing circuit 7c Speed judgment unit 7d Coasting start calculation unit 8 wiper switch 9 switching stages 55 Power RL1 (drive stage) first relay RL2 (driving stage) Second relay

Claims (5)

[Claims] 1. A wiper motor having an output shaft that rotates normally and reversely when energized, and an output shaft of the wiper motor, which is connected to the output shaft of the wiper motor and is rotated at a reversing position on the wiping surface while being reversed. Having a wiper arm that swings back and forth, a wiper attached to the wiper arm and having a wiper blade pressed against the wiping surface, a drive stage electrically connected to the wiper motor, and a drive stage connected to the power source. A central processing circuit connected to the central processing circuit; and a wiper switch electrically connected to the central processing circuit, the intermittent mode and the continuous mode being respectively selected, the central processing circuit moving toward an inversion position. When the wiper arm reaches a coasting start position selected near the reversal position depending on the speed of the wiper arm and the voltage level of the power supply, the wiper arm is reached. Wiper control apparatus characterized by interrupting the armature short circuit formed on the wiper motor so as to coast the Paamu. 2. The central processing circuit selects the coasting start position to an early position when the voltage level of the power supply is high,
The wiper control device according to claim 1, wherein the coasting start position is selected to a slow position when the voltage level of the power supply is low. 3. The switching stage is arranged in the energization path of the drive stage, and the switching stage cuts off the ground path of the drive stage by being turned off.
Alternatively, the wiper control device described in 2. 4. The central processing circuit includes a voltage determination unit for detecting voltage of a power source to obtain voltage data, a speed determination unit for detecting speed of a wiper arm, voltage data of the voltage determination unit and the speed determination unit. The wiper control device according to claim 1, 2 or 3, further comprising: a coasting start calculation unit that controls a switching stage based on the speed data of 1. 5. The wiper control device according to claim 4, wherein the central processing circuit selects the reversal target position of the wiper arm based on the voltage data of the voltage determination unit and the speed data of the speed determination unit.