JPH04130572U - wiper device - Google Patents

Abstract

(57) [Summary] [Purpose] Even when there are minute raindrops such as drizzle that cannot be detected by a raindrop sensor, the wiper motor can be operated accurately to ensure visibility and allow safe driving. [Structure] A raindrop sensor 2 that detects raindrops, a wiper motor 3 that operates a wiper blade, a motor period detection means 5 that detects the rotation period of the wiper motor 3, and a motor period detection means 5 that detects the rotation period of the wiper motor 3. Period storage means 6 for storing a predetermined plurality of data, and the latest motor period time data and the motor period stored before the latest motor period time data among the motor period times stored in the period storage means 6. Comparing means 7 calculates and compares the time data and generates an output signal, and calculating means 8 sets the pause time of the intermittent operation of the wiper motor 3 based on the raindrop signal detected by the raindrop sensor 2 and the output signal of the comparing means 7.
a Prepared.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

For example, this idea wipes away rain and snow that adheres to a car's windshield glass. A wiper device used to secure visibility by wiping with a wiper blade. In particular, by detecting raindrops, the wiper blade automatically wipes the rain. This relates to a wiper device.

0002

[Conventional technology]

4 and 5 illustrate this type of wiper device, with the illustrated wiper device being The wiper device 50 is connected to a wiper switch 51 and a wiper blade 52 shown in FIG. wiper motor 53, raindrop sensor 54 and wiper amplifier 55 (for analog control) ), and the wiper switch 51 has a high speed switch as shown in FIG. A switch 51a, a low speed switch 51b, and an intermittent switch 51c are provided. , each of the switches 51a, 51b, 51c is a switch provided in the wiper amplifier 55. They are connected to terminals 55a, 55b, and 55c, respectively.

0003 In addition, the wiper motor 53 is provided with an armature 53a as shown in FIG. A power supply brush 53c, a high speed brush 53d, and a low speed brush are in pressure contact with the commutator 53b. The armature 53a is equipped with a brush 53e and an armature mounted on the armature 53a. Two contact plates 53g and 53h linked to the shaft 53f and these controllers Two contactors 53i, 53 contacting and separating from tact plates 53g, 53h An auto-stop switch 53k consisting of j is provided.

0004 Then, each brush 53c, 53d, 53e and each contactor 53i, 53j are the brush terminals 55d, 55e, 55f provided in the wiper amplifier 55 and the contactor end. It is connected to children 55g and 55h.

[0005] Further, one end side of the raindrop sensor 54 is connected to ground and also One end of the droplet sensor 54 is connected to a sensor terminal 55i provided in the wiper amplifier 55. This raindrop sensor 54 uses an amplification circuit (not shown) to detect vibrations caused by the strength of colliding rain. The waveform is converted by the path and input to the wiper amplifier 55.

[0006] Furthermore, the wiper amplifier 55 switches the intermittent switch 51c on. Each brush terminal 55d, 55 is supplied with a preset rest time corresponding to Power is supplied to each brush 53c, 53e via e, and the intermittent switch When the switch 51c is turned on, a raindrop signal is input from the raindrop sensor 54. In this case, after the raindrop signal is charged by the charging circuit, the charging circuit charges the raindrop signal. Supply through a pause time set corresponding to the time when the potential exceeds a predetermined value It is designed to supply power in hours, and as the raindrops get stronger, the downtime increases. Set short.

[0007] Furthermore, the armature shaft 53f is connected to the vehicle body 6 via a link 56. A wiper blade 52 that swings relative to zero is connected.

[0008] In the wiper device 50 having such a structure, the high speed switch 51a or When the low speed switch 51b is turned on, the switch terminal 5 of the wiper amplifier 55 5a, a grounding circuit is provided by the high-speed switch 51a or the low-speed switch 51b. Since the brush terminal 55d and the brush terminal 55e of the wiper amplifier 55 are The power brush for the wiper motor 53 is connected to the brush terminal 55d and the brush terminal 55f. 53c, high speed brush 53d or power supply brush 53c, low speed brush 53e. Power is supplied, the armature shaft 53f rotates at high or low speed, and the The wiper blade 52 is moved to the wiping surface 60 of the windshield glass 60a through the High speed or low speed between lower reversal position a and upper reversal position b Wipe it away with the reciprocating motion of the speed.

[0009] Also, in this state, turn off the high speed switch 51a or the low speed switch 521b. When switched, the high speed switch 51 is connected to the switch terminal 55a of the wiper amplifier 55. A or low speed switch 51b will no longer form a ground circuit, but the wiper When the blade 52 is in a position other than the lower inverted position a, the armature shaft 53f is The contact pin on one side of the auto stop switch 53k rotated in conjunction with the rotation. The contactor 53j on the other side contacts the rate 53g to form a ground circuit. Therefore, the contactor 5 on one side is connected to the contact plate 53h on the other side. For the power supply from the wiper amplifier 55 to the wiper motor 53 until 3i contacts The wiper blade 52 continues to supply power to the brush 53a and the low-speed brush 53e. When the wiper motor 53 reaches the lower reversal position a, the power supply to the wiper motor 53 is stopped. .

0010 Then, when the intermittent switch 51c is turned on, the wiper amplifier 55 is turned on. Since a ground circuit is formed at the switch terminal 55c by the intermittent switch 51c, The timer built into the wiper amplifier 55 is turned on and the preset break is activated by this timer. During the supply time through the stop time, the power is turned on by the brush terminals 55d and 55f. Supplied intermittently to the power brush 53c and low speed brush 53e of the IPA motor 53 .

[0011] The power supply brush 53c and low speed brush 53e of the wiper motor 53 are Since power is supplied intermittently during the supply time via The mature shaft 53f rotates and wipes the wiper blade 52 via the link 56. The lower inverted position a and the upper inverted position with respect to the wiping surface 60b of the wind shield glass 60a. Wipe between b with intermittent reciprocating motion at low speed.

0012 Also, as the supply time elapses, the wiper amplifier 55 timer turns off. The ground circuit is cut off by the intermittent switch 51c in response to the downtime. , when the wiper blade 52 is in a position other than the lower inverted position a, the armature shaft The controller on one side of the auto stop switch 53k rotated in conjunction with the rotation of 53f. The contactor 53j on one side contacts the tact plate 53g and the ground circuit continues to form, so that the contact plate 53h on one side is From the wiper amplifier 55 to the wiper motor 53 until the contactor 53j comes into contact with the wiper motor 53. The wiper brake is activated by continuing to supply power to the power brush 53c and low speed brush 53e. When the card 52 reaches the lower reversal position a, the power supply to the wiper motor 53 is stopped. The wiper blade 52 is stopped at the lower inverted position a.

[0013] Furthermore, the timer of the down time set by the wiper amplifier 55 timer is When the timer turns on from the off state due to Since a ground circuit is formed correspondingly between the The ture shaft 53f rotates and wipes the wiper blade 52 via the link 56. A lower inverted position a and an upper inverted position b with respect to the wiped surface 60b of the shield glass 60a. The intermittent switch 51c is turned on. While switching, the motor shaft 53f of the wiper motor 53 rotates and stops. Repeat stop.

[0014] Therefore, with the intermittent switch 51c turned on and the raindrop sensor 54 When a raindrop signal is input from the wiper amplifier 55, the raindrop signal is input to the charging circuit. Therefore, after charging, the potential charged by the charging circuit exceeds a predetermined value. For the power supply of the wiper motor 53 at the supply time via the rest time set corresponding to the time Since power is supplied to the brush 53c and the low speed brush 53e, the power is supplied based on the raindrop signal. The armature shaft 53f rotates during the supply time that passes through the set rest time and restarts. The wiper blade 52 is connected to the wiper surface of the windshield glass 60a through the link 56. For 60b, wipe between the lower inversion position a and the upper inversion position b with intermittent reciprocating motion. Ru.

[0015] Then, as the supply time elapses, the pause time is set based on the raindrop signal. The power supply will be stopped due to the supply time running out through the wiper blade 5. 2 is at a position other than the lower inversion position a, it is linked to the rotation of the armature shaft 53f. Contact plate 53 on one side of auto stop switch 53k rotated Since the contactor 53j on one side continues to make contact with g and form a ground circuit, , the contactor 53j on one side contacts the contact plate 53h on the other side. The power supply brush 53 of the wiper motor 53 is connected from the wiper amplifier 55 until c. Continue to supply power to the low-speed brush 53e, and the wiper blade 52 is reversed at the bottom. When the wiper motor 53 reaches position a, the power supply to the wiper motor 53 is stopped and the wiper brake is turned off. The card 52 is stopped at the lower inverted position a.

[0016] Furthermore, when the pause time set based on the raindrop signal times up, When the wiper amplifier 55 starts supplying power corresponding to the supply time, the supply During feeding time, the armature shaft 53f rotates and the wiper brake is connected via the link 56. 52 to the lower inverted position a with respect to the wiping surface 60b of the windshield glass 60a. The area between the upper inverted position b is wiped by intermittent reciprocating motion at low speed, and the raindrop signal is input. While the power is on, the supply time is determined through the pause time set based on the raindrop signal. By supplying intermittent power to the wiper motor 53, the motor shaft 53f is Repeats rotation and stopping.

[0017]

[Problem that the idea aims to solve]

However, in the conventional wiper device 50 described above, the raindrop signal from the raindrop sensor 54 is Power is supplied to the wiper motor 53 at a supply time having a down time set based on the No. Because of its structure, when minute raindrops such as drizzle collide with the raindrop sensor 54, , since the raindrop sensor 54 does not vibrate and does not detect minute drizzle, it is not possible to input a raindrop signal. The timer of the wiper amplifier 55 allows the wiper amplifier to operate without any By operating the wiper motor 53 with a supply time through a fixed rest time. There is a problem that visibility is reduced, and it is difficult to solve these problems. This had become an issue.

[0018]

[Purpose of invention]

Therefore, this idea was made in view of the conventional problems mentioned above. Even when there are small raindrops, the wiper motor operates accurately to ensure visibility. The purpose is to provide a wiper device that can

[0019]

[Means to solve the problem]

The wiper device related to this invention includes a raindrop sensor that detects raindrops and a wiper brake. Detects the wiper motor that operates the wiper motor and the rotation period time of the wiper motor. A motor period detection means and a motor period time data detected by the motor period detection means. periodic storage means for storing a predetermined plurality of motors; and a periodic storage means for storing a predetermined plurality of motors; The latest motor cycle time data and the latest motor cycle time data are Calculates and compares the motor cycle time data stored previously and outputs a signal. a comparison means for generating a raindrop signal, and a raindrop signal detected by the raindrop sensor and an output signal of the comparison means. The device shall be equipped with calculation means for setting the pause time for intermittent operation of the wiper motor. and, in a more preferred embodiment, a raindrop sensor for detecting raindrops. and the wiper motor that operates the wiper blade, as well as continuous, intermittent, stopped, and automatic operation. The wiper switch that sets the rotation mode and the rotation period time of the wiper motor are detected. a motor period detection means to output the motor period, and a motor period detected by the motor period detection means. periodic storage means for storing a predetermined plurality of pieces of data between; The latest motor cycle time data and the latest motor cycle time data of the motor cycle time Calculates and compares the motor cycle time data stored before the data is stored. a comparison means for generating a force signal and a raindrop sensor in the automatic mode of said wiper switch; The wiper motor can be operated continuously or intermittently based on the raindrop signal detected by the sensor and the output signal of the comparison means. In addition to setting the power supply for operation and the pause time for intermittent operation, the wiper operation mode is A mode setting procedure that supplies power for continuous or intermittent operation to the wiper motor according to the mode. In a further preferred embodiment, the raindrops are A raindrop sensor that detects raindrops, a wiper motor that operates the wiper blade, and a high-speed/low-speed A wiper switch that sets the speed, intermittent, stop, and automatic operation modes, and the wiper a motor period detection means for detecting a rotation period of the motor; period storage means for storing a predetermined plurality of motor period times detected in the step; The latest motor cycle time data among the motor cycle times stored in the cycle storage means and the motor cycle time data stored before the latest motor cycle time data is stored. the wiper switch; Based on the raindrop signal detected by the raindrop sensor and the output signal of the comparison means in automatic mode. Setting the power supply for high-speed, low-speed, and intermittent operation of the wiper motor and the pause time for intermittent operation At the same time, the wiper motor changes depending on the high speed, low speed, or intermittent mode of the wiper switch. be equipped with mode setting means for supplying power for high-speed, low-speed, and intermittent operation. The above-mentioned configuration of the wiper device solves the conventional problems. This was done as a means of achieving this goal.

[0020]

[Effect]

The wiper device related to this invention detects the rate of change in speed per rotation of the wiper motor. The acceleration of the wiper motor is detected based on the rate of change, and the change in the detected acceleration is detected. Detects the load on the wiper motor based on the movement and sets the wiper rest time according to the load. Therefore, when there are minute raindrops that cannot be detected by the raindrop sensor, the wiper mode If there is a change in the acceleration of the wiper motor, it is necessary to change the pause time of the wiper motor's intermittent operation. Therefore, the wiper motor must be activated to wipe with the wiper blade. Ru.

[0021]

【Example】

1 to 3 show an embodiment of a wiper device according to this invention.

[0022] As is clear from FIG. 1, the illustrated wiper device 1 includes a raindrop sensor for detecting raindrops. a wiper motor 3 that operates a wiper blade 10 (see FIG. 2), and a wiper motor 3 that operates a wiper blade 10 (see FIG. 2). a motor period detecting means 5 for detecting the rotation period time of the IPA motor 3; Cycle memory for storing a predetermined plurality of motor cycle time data detected by the detection means 5 The latest motor cycle time among the motor cycle times stored by the means 6 and the cycle storage means 6 The motor cycle time data and the motor cycle data stored before the latest motor cycle time data are stored. a comparison means 7 that calculates and compares the period data and generates an output signal; and a raindrop sensor. The wiper motor 3 is operated intermittently by the raindrop signal detected in step 2 and the output signal of the comparison means 7. It is equipped with a calculating means 8a for setting the rest time of the operation mode. The mode setting means 8 is provided in the mode setting means 8 which receives the signal from the wiper switch 4 for setting the mode. Ru.

[0023] As is clear from FIG. 2, the raindrop sensor 2 includes a thin metal plate 2a with a piezoelectric It is a vibration sensor in which element 2b is bonded together, and one end is connected to ground. The other end is connected to the comparison circuit 7 via the amplifier circuit 11 and the A/D converter 12. Then, a large voltage is generated depending on the strength of the rain that collided with the metal plate 2a. After the voltage is processed by the amplifier circuit 11 and the A/D converter 12, it is passed through the comparison circuit 7. and is transferred to the mode setting means 8.

[0024] As is clear from FIG. 2, the wiper motor 3 has a Power supply brush 3c, high-speed brush 3d, and low-speed brush that press against the girder commutator 3b 3e is provided, and the armature shaft 3 provided in the armature 3a Two contact plates 3g and 3h linked to f and these contact plates An autostop consisting of two contactors 3i and 3j that touch and separate from 3g and 3h. It is equipped with a push switch 3k.

[0025] A power supply circuit 13 and a D/A converter 1 are connected to each of the brushes 3c, 3d, and 3e. 4, mode setting means 8 is connected to each contactor 3i, 3j. The mode setting means 8 is connected to the data period detection means 5 via the D/A converter 15. Therefore, a windshield is connected to the armature shaft 3f via a link 16. The wiping surface 20a from the lower inverted position a to the upper inverted position b of the glass 20 is shaken. A movable wiper blade 10 is connected.

[0026] The wiper switch 4 includes a high-speed switch 4a whose one end is connected to ground, and a low-speed switch 4a whose one end is connected to ground. A speed switch 4b, an intermittent switch 4c, and an automatic switch 4d are provided. The other end of each of the switches 4a, 4b, 4c, 4d is connected to the motor via the A/D converter 17. They are respectively connected to the code setting means 8.

[0027] When the high speed switch 4a is turned on, the switch mode is set. becomes high-speed (continuous) mode, and the low-speed switch 4b is turned on. The switch mode becomes low speed (continuous) mode, and the intermittent switch 4c is turned on. By doing this, the switch mode becomes intermittent mode and the automatic switch 4d is turned on. By switching, the switch mode becomes automatic mode, and each of the switches 4a , 4b, 4c, and 4d are all turned off to stop the switch mode. mode.

[0028] The motor period detecting means 5 is connected to one side of the auto stop switch 3k. From the state where the contact plate 3i is in contact with the contact plate 3g on one side, separated from the contact plate 3g on one side in conjunction with the rotation of the shaft 3f. After that, a timer is set for the time until the contact plate 3g on one side is contacted again. Count by.

[0029] The motor period detection means 5 is connected to the period storage means 6 and is connected to the period storage means 6. The motor cycle of each rotation of the wiper motor 3 is detected by counting the timer. The output motor cycle time data is transferred to the cycle storage means 6.

[0030] The period storage means 6 is connected to the comparison means 7, and as shown in FIG. The motor cycle time data A (A 1, A2, A3, A4, A5), B (B1, B2, B3, B4, B5), C (C 1, C2, C3, C4, C5), D (D1, D2, D3, D4, D5) The stored motor cycle time data is transferred to the comparison means 7, and the The earliest data of the wiper motor 3 is stored in the cycle storage means 6. It is cleared when the motor cycle time for each revolution is detected and is shown in the following five plots. memories are made.

[0031] The comparison means 7 comprises a logic circuit and is connected to the mode setting means 8. Therefore, in the motor cycle time data A stored by the cycle storage means 6, the latest motor motor cycle time data A5 and the previous motor cycle time data A5 from the latest motor cycle time data A5. Compare and calculate the motor cycle time data A4 and calculate it according to the rotation rate of the armature shaft 3f. The calculation results calculated as acceleration data are transferred to the mode setting means 8, and the latest model motor cycle time data A5 and the previous motor cycle time data A5 from the latest motor cycle time data A5. When it is determined that there is no difference in the motor cycle time data A4, the latest motor cycle time Data A5 and the motor cycle time two times before the latest motor cycle time data A5 Data A3, 3 motor cycle time data before the latest motor cycle time data A5 A2, motor cycle time data A 4 times before the latest motor cycle time data A5 1 is compared and the result of the calculation is transferred to the mode setting means 8 as an output signal.

[0032] Further, the comparison means 7 also includes motor cycle time data B stored by the cycle storage means 6, In C and D~, the comparison operation is performed in the same way as above, and the operation result is used as an output signal to set the mode. When the raindrop signal from the raindrop sensor 2 is input during calculation, the acceleration is transferred to the setting means 8. The raindrop signal is given priority and transferred to the mode setting means 8, ignoring the degree data.

[0033] The mode setting means 8 includes a comparison method when the switch mode is the automatic mode. When the acceleration data taken from stage 7 becomes a negative value, that is, when the latest motor rotation The cycle data is longer than the motor cycle data from this latest motor cycle data to the previous motor cycle data. When it is determined that the period of intermittent operation is longer than the previous period, is set long, and when the acceleration data taken from comparison means 7 becomes a positive value, the upper Contrary to the description above, there is a model incorporating calculation means 8a that sets the pause time to be shorter than the previous time. It has a built-in microcomputer.

[0034] The mode setting means 8 also includes high speed, low speed and intermittent modes of the wiper switch 4. Depending on the switching, the wiper motor 3 power brush 3c, high speed brush 3d, low speed brush While setting the power supply to the brush 3e, the raindrop signal from the raindrop sensor 2 is input. when the voltage level of the raindrop signal reaches a predetermined threshold level. High-speed operation, low-speed operation, and intermittent operation with shorter and longer rest times corresponding to the time required. It has a built-in power switching circuit that sets and supplies power.

[0035] Further, the mode setting means 8 is set to the auto stop switch 3k of the wiper motor 3. The provided contactors 3i, 3j contact and separate from the contact plates 3g, 3h. As a result, the position of the wiper blade 10 is detected, and the wiper switch 4 is set to high speed mode. , when switching from low-speed mode, intermittent mode, or automatic mode to stop mode, as shown in Figure 2. As shown, when the wiper blade 55 is at a position other than the lower reversed position a, the wiper blade Power is supplied to the wiper motor 3 until the card 10 reaches the lower reversal position a. The sea urchin is turning.

[0036] In the wiper device 1 having such a structure, the automatic switch of the wiper switch 4 is With switch 4d turned on and the switch mode set to automatic mode, the raindrop sensor When rain collides with the sensor 2 and a raindrop signal is input to the comparison circuit 7, the comparison circuit 7 detects the raindrop sensor. The raindrop signal from the sensor 2 is given priority and transferred to the mode setting means 8.

[0037] The mode setting means 8 receives the raindrop signal by inputting the raindrop signal to the mode setting means 8. corresponds to the time it takes for the signal voltage level to reach a predetermined threshold level. By setting high-speed operation, low-speed operation, and intermittent operation with short and long pause times, it can be used as a raindrop signal. If you set intermittent operation with a shorter pause time based on the The power supply for intermittent operation, which has a supply time through the stop time, is connected to the power supply brush for the wiper motor 3. Since the wiper motor is supplied to the wiper brush 3c and the low speed brush 3e, the Since the armature shaft 3f of the rotor 3 rotates, the wiper Move the blade 10 to the lower inverted position with respect to the wiping surface 20a of the windshield glass 20. The area between a and the upper inverted position b is wiped by intermittent reciprocating motion.

[0038] As the armature shaft 3f rotates, the motor period detection means 5, The maximum value of each motor period data A, B, C, and D is determined through the period storage means 6 and the comparison means 7. New motor cycle time data A5, B5, C5, D5 and the latest motor cycle time Motor cycle time data A4, B4, one piece before data A5, B5, C5, D5, Compare and calculate C4 and D4 sequentially.

[0039] At this time, as is clear from FIG. 3, the latest The motor cycle time data B5 is one piece before the latest motor cycle time data B5. The comparison circuit determines that the motor has a longer cycle than the motor cycle time data B4. 7, the mode setting means 8 performs the next operation via the calculation means 8a. Since the pause time of intermittent operation is set as a longer operation than the previous time, the set The operating power from the operation is supplied to the power supply brush 3c and low speed brush 3e of the wiper motor 3. The armature shaft of the wiper motor 3 is supplied with a long downtime. Since the foot 3f rotates, the wiper blade 10 is moved to the windshield via the link 15. A lower inverted position a and an upper inverted position b are located with respect to the wiped surface 20a of the shield glass 20. The dust is wiped away with intermittent back-and-forth motion with long downtimes.

[0040] Also, in this state, if the raindrop signal from raindrop sensor 2 is no longer input, the trigger will also be triggered. Continuing to compare and calculate the motor cycle time data, motor cycle time data D Is the latest motor cycle time data D5 the latest motor cycle time data D5? The motor cycle time data D4 must have a longer cycle than the previous motor cycle time data D4. If transferred, the next operation is intermittently set by the mode setting means 8 via the calculation means 8a. Since the pause time of the operation is set as an operation longer than the previous time, we set this time. The operating power generated by the fixed operation is supplied to the power supply brush 3c of the wiper motor 3 and the low speed brush. The wiper motor 3 is supplied to the wiper motor 3 with a supply time through a longer pause time than the above. Since the armature shaft 3f rotates, the wiper brake is connected via the link 15. 10 to the lower inverted position a and the upper wiping is performed between the reversing position b and the reversing position b by intermittent reciprocating motion with a long pause time.

[0041] Then, the raindrop signal from raindrop sensor 2 is no longer input, and the result of the comparison calculation is The latest motor cycle time data of the motor cycle time data and the latest motor cycle time When there is no difference between the motor cycle time data and the previous motor cycle time data, From the latest motor cycle time data and the latest motor cycle time data, motor cycle time data, motor cycle time three times before the latest motor cycle time data Data, sequentially from the latest motor cycle time data to the 4 previous motor cycle time data. The comparison calculation is performed and the calculation result is transferred to the mode setting means 8, and the calculation result is transferred to the mode setting means 8. If there is no difference in the data cycle time, cancel the operation settings and The power supply to the IPA motor 3 will be stopped.

[0042]

[Effect of the idea]

As explained above, the wiper device according to this invention has the above-mentioned configuration. Therefore, the rate of change in speed per rotation of the wiper motor can be detected and the The acceleration of the wiper motor is detected, and the wiper motor is Detects the load and adjusts the wiper motor for high-speed, low-speed, and intermittent operation according to the load. The power supply and intermittent operation pause times are set, so the rain sensor does not detect rain. If the acceleration of the wiper motor fluctuates when there are minute raindrops, check the wiper motor. You can switch the power supply for high-speed, low-speed, and intermittent operation, and change the pause time for intermittent operation. The wiper motor is activated and the wiper blade performs wiping. , the supply time through the rest time set based only on the raindrop signal from the raindrop sensor Compared to the one that supplies power to the wiper motor intermittently, it does not depend only on the raindrop signal. , the raindrop sensor is used to detect the load on the wiper motor and switch the power supply. Operates the wiper motor accurately even when there are minute raindrops such as drizzle that cannot be detected. In addition to ensuring visibility and safe driving, the wiper blades Even if deterioration occurs, the rate of change due to wiper motor rotation corresponds to the wiper blade. This has the excellent effect of stably detecting the load. It is.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a wiper device according to the invention.

FIG. 2 is a specific circuit configuration diagram of the wiper device shown in FIG. 1.

FIG. 3 is an explanatory diagram of motor cycle time data in the wiper device shown in FIG. 1;

FIG. 4 is a block diagram of a conventional wiper device.

FIG. 5 is a specific circuit configuration diagram of the wiper device shown in FIG. 4;

[Explanation of symbols]

1 Wiper device 2 Raindrop sensor 3 Wiper motor 4 Wiper switch 5 Motor period detection means 6 Periodic storage means 7 Means of comparison 8a(8) (Calculating means) Mode setting means 10 Wiper blade

Claims (3)

[Scope of utility model registration request] 1. A raindrop sensor that detects raindrops, a wiper motor that operates a wiper blade, a motor period detection means that detects a periodic time of rotation of the wiper motor, and data of a motor periodic time detected by the motor period detection means. a period storage means for storing a predetermined plurality of motor period times; and the latest motor period time data and motor period time data stored before the latest motor period time data are stored among the motor period times stored in the period storage means. and a calculation means for setting a pause time for intermittent operation of the wiper motor based on the raindrop signal detected by the raindrop sensor and the output signal of the comparison means. wiper device. 2. A raindrop sensor that detects raindrops, a wiper motor that operates a wiper blade, a wiper switch that sets continuous, intermittent, stop, and automatic operation modes, and a motor cycle that detects the rotation period of the wiper motor. a detection means; a period storage means for storing a predetermined plurality of pieces of motor period time data detected by the motor period detection means; Comparison means that calculates and compares the motor cycle time data stored before the motor cycle time data is stored to generate an output signal;
In the automatic mode of the wiper switch, the raindrop signal detected by the raindrop sensor and the output signal of the comparing means are used to supply power for continuous/intermittent operation of the wiper motor and to set the pause time for intermittent operation, and also to set the pause time for intermittent operation according to the wiper operation mode. The wiper device according to claim 1, further comprising mode setting means for supplying power for continuous or intermittent operation to the wiper motor. 3. A raindrop sensor that detects raindrops, a wiper motor that operates a wiper blade, a wiper switch that sets high-speed, low-speed, intermittent, stop, and automatic operation modes, and detects the periodic time of rotation of the wiper motor. motor period detection means; period storage means for storing a predetermined plurality of pieces of motor period time data detected by the motor period detection means; and the latest motor period time data among the motor period times stored in the period storage means. a comparison means for generating an output signal by calculating and comparing the latest motor cycle time data with the motor cycle time data stored before the latest motor cycle time data is stored; and a raindrop signal detected by the raindrop sensor in the automatic mode of the wiper switch. The output signal of the comparison means supplies power for high-speed, low-speed, and intermittent operation of the wiper motor and sets the pause time for intermittent operation, and also sets the wiper motor for high-speed, low-speed, and intermittent operation according to the high-speed, low-speed, and intermittent mode of the wiper switch. The wiper device according to claim 1 or 2, further comprising mode setting means for supplying power for the wiper device.