Wiper control method and wiper control device

Abstract

The present invention provides a wiper control method and a wiper control device, which can cope with wind load and high load and suppress the over-limit of the reversal position. The present invention is a vehicle wiper device, which can cope with wind load and high load and suppress the over-limit of the reversal position. The wiper device (1) has a wiper blade (16), a wiper arm (5, 6) installed with the wiper blade (16), and a wiper motor (3) for driving the wiper arm (5, 6). The load generated by the wiper motor (3) when the wiper blade (16) moves on the front glass (2) is estimated based on the motor supply current and the like. When the outbound load generated by the wiper motor (3) exceeds a specified threshold, a high load correction process (S5, S6) is implemented based on the outbound load. When the outbound load is below the threshold, a wind load correction process (S5 to S8) is implemented based on the wind load calculated based on the difference between the outbound load and the return load.

Description

Technical Field

[0001] The present invention relates to a control technology for a vehicle wiper device, and more particularly to a wiper control method and a wiper control device that can suppress overrun of a reverse position and set a wider wiping area. Background Art

[0002] In a vehicle wiper device, the load on the wiper blades and wiper arms (hereinafter referred to as blades, etc.) caused by the wind during driving is different in the outward action (down→up) and the return action (up→down). That is, in the outward action, the blades, etc. are pushed upward by the wind, and the load becomes lighter. In contrast, in the return action, the blades, etc. are pushed back by the driving wind, and the load increases accordingly. Therefore, in the so-called controlled wiper that controls the wiping action according to the position of the blades, etc. or the motor output, etc., the difference in motor output based on the difference in load during the outward action and the return action is detected, and the influence of the wind load is appropriately adjusted. Therefore, the action angle of the wiper motor is corrected according to the motor output difference (wind load correction), and the overrun of the blades, etc. in the upper reversal position is suppressed.

[0003] Moreover, in controlling the wiper, differently from the wind load response control as described above, in order to cope with the load (surface load) of the blades etc. that changes due to the state of the wiping surface etc., a high load correction (surface load correction) is also implemented to control the operation of the wiper motor based on the detected values ​​of the motor speed or vehicle speed, ambient temperature, motor current etc. in addition to the motor output. Figure 5 FIG. 2 is a flow chart showing a conventional windshield wiper control method. Figure 5 As shown, here, a correction amount for high load correction and a correction amount for wind load correction are calculated respectively along with the wiper operation (steps S11 and S12; hereinafter, “step” is omitted and simply described as S11).

[0004] After calculating each correction amount, the process proceeds to S13 to compare the two. At this time, if the high load correction amount is greater than the wind load correction amount, the process proceeds to S14 to implement the high load correction. On the other hand, if the wind load correction amount is greater than the high load correction amount, the process proceeds to S15 to implement the wind load correction. That is, the correction amounts based on the two loads are compared and studied, and the control form with the larger correction amount is selected to implement the wiper control corresponding to the current condition of the blades, etc.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Publication No. 2002-512919 Summary of the invention

[0008] Problems to be solved by the invention

[0009] On the other hand, at a high load, the correction amount obtained by wind load correction becomes smaller. Figure 6 This is a diagram showing the motor load caused by the wind during travel. Figure 6 (a) represents the motor load at low load. Figure 6 (b) indicates the motor load at high load. Figure 6 As shown in (a) of FIG. 1 , in the case of wind load, the influence of wind becomes a +- relationship between the outgoing path and the return path, so the difference X between the motor load of the outgoing path and the return path becomes larger when the load is low. In contrast, when the load is high, Figure 6 As shown in (b), the amount of load in the outgoing path and the return path does not change much, the difference X between the two becomes smaller, and the correction amount also becomes smaller accordingly.

[0010] Therefore, for example, if the wiper device is operated during light rain, the wiping surface is not very wet, and although it cannot be said to be a high load, the operating load of the blades is greater than that during heavy rain. Figure 5 In the process, the wind load correction is performed from S13 to S15. At this time, the wind load correction amount is as follows: Figure 6 As in the case of (b), it becomes smaller than that at the low load, and the correction amount of the blade stop position at the upper reversal position is also set to a relatively small value.

[0011] However, in the case of light rain, although the front glass is not very wet, water may accumulate near the pillar, and the accumulated water may wet the wiping surface near the upper reversal position. As a result, the load on the blade may change suddenly (stick-slip) near the upper reversal position in the forward motion, causing the blade to slip. However, the correction amount is set small as described above, which has the following problems: it is difficult to correct the sudden change in state, and there is a possibility of overrun at the upper reversal position.

[0012] An object of the present invention is to provide a wiper control method and a wiper control device that can cope with wind load and high load and suppress over-limit of the reversal position.

[0013] Technical means of solving problems

[0014] The wiper control method of the present invention is a control method for a wiper device, wherein the wiper device comprises: a wiper blade, which is arranged on a windshield of a vehicle; a wiper arm, on which the wiper blade is installed, and which is driven back and forth between an upper reversal position and a lower reversal position set on the windshield; and a motor for driving the wiper arm, wherein the wiper control method is characterized in that a forward load generated by the motor when the wiper blade moves from the lower reversal position to the upper reversal position is detected, and when the forward load of the motor exceeds a prescribed threshold value, the movement of the wiper arm is corrected with a first correction value set based on the forward load, and when the forward load is below the threshold value, the movement of the wiper arm is corrected with a second correction value, wherein the second correction value is set based on the wind load of the motor generated by wind borne by the vehicle when traveling.

[0015] In the present invention, the load of the motor caused by the state of the wiping surface is determined in the outgoing path, and when it exceeds a threshold value, the action of the wiper arm is corrected by a first correction value based on the outgoing path load. On the other hand, when the outgoing path load is below the threshold value, the action of the wiper arm is corrected by a second correction value based on the wind load caused by the traveling wind. Thus, the detection of the surface load caused by the state of the wiping surface and the wind load caused by the traveling wind can be identified with the same reference, which load has a greater impact can be reliably determined, and the detection accuracy of the wiper wiping condition can be improved.

[0016] In the wiper control method, the wind load may be calculated based on the difference between the outgoing load and the return load generated by the motor when the wiper blade moves from the upper reversal position to the lower reversal position. Furthermore, the outgoing load and the return load may be calculated based on the current supplied to the motor, the voltage applied to the motor, the driving speed of the vehicle, and the outside temperature.

[0017] On the other hand, the wiper control device of the present invention is a control device for controlling the operation of the wiper device, the wiper device comprising: a wiper blade arranged on a windshield of a vehicle; a wiper arm on which the wiper blade is mounted and which is driven back and forth between an upper reversal position and a lower reversal position set on the windshield; and a motor for driving the wiper arm, and the wiper control device is characterized in that it comprises: a motor load calculation unit for detecting a load generated by the motor when the wiper blade moves on the windshield; a motor load determination unit for comparing a forward load generated by the motor when the wiper blade moves from the lower reversal position to the upper reversal position with a prescribed threshold value; and a wiper operation correction unit for correcting the operation of the wiper arm with a first correction value set based on the forward load when the forward load of the motor exceeds a prescribed threshold value, and for correcting the operation of the wiper arm with a second correction value when the forward load is below the threshold value, the second correction value being set based on a wind load of the motor generated by wind to which the vehicle is subjected when traveling.

[0018] In the present invention, a load calculation unit is used to detect the load of the motor caused by the state of the wiping surface, and a motor load determination unit is used to compare the outgoing load with a threshold value. When the outgoing load exceeds the threshold value, a wiper action correction unit is used to correct the action of the wiper arm with a first correction value based on the outgoing load. On the other hand, when the outgoing load is below the threshold value, a wiper action correction unit is used to correct the action of the wiper arm with a second correction value based on the wind load caused by the traveling wind. Thus, the detection of the surface load caused by the state of the wiping surface and the wind load caused by the traveling wind can be identified with the same reference, which load has a greater influence can be reliably determined, and the detection accuracy of the wiper wiping condition can be improved.

[0019] In the wiper control device, the motor load calculation unit may calculate the outgoing load generated by the motor when the wiper blade moves from the lower reversal position to the upper reversal position, and the return load generated by the motor when the wiper blade moves from the upper reversal position to the lower reversal position, and the wiper action correction unit may calculate the wind load based on the difference between the outgoing load and the return load. Furthermore, the motor load calculation unit may calculate the outgoing load and the return load based on the amount of current supplied to the motor, the voltage applied to the motor, the driving speed of the vehicle, and the outside temperature.

[0020] Effects of the Invention

[0021] According to the wiper control method of the present invention, the load caused by the state of the wiping surface is judged in the outgoing path, and when it exceeds the threshold, the action of the wiper arm is corrected with a first correction value based on the outgoing path load, and when the outgoing path load is below the threshold, the action of the wiper arm is corrected with a second correction value based on the wind load caused by the running wind, so that the detection of the surface load caused by the state of the wiping surface and the wind load caused by the running wind can be identified with the same reference. In this way, which load has a greater impact can be reliably grasped, and the detection accuracy of the wiper wiping condition can be improved.

[0022] According to the wiper control device of the present invention, there are provided: a load calculation unit for detecting the load of the motor caused by the state of the wiping surface; a motor load determination unit for comparing the load of the outgoing path with a threshold value; and a wiper action correction unit for correcting the action of the wiper arm with a first correction value based on the outgoing path load when the outgoing path load exceeds the threshold value, and correcting the action of the wiper arm with a second correction value based on the wind load caused by the running wind when the outgoing path load is below the threshold value, so that the detection of the surface load caused by the state of the wiping surface and the wind load caused by the running wind can be identified with the same reference. Thus, it is possible to reliably grasp which load has a greater influence, and improve the detection accuracy of the wiper wiping condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an explanatory diagram showing the structure of a wiper device to which a wiper control method and a control device according to an embodiment of the present invention are applied.

[0024] Figure 2 A block diagram showing the structure of a wiper drive device.

[0025] Figure 3 This is a block diagram showing the structure of an arm motion determination unit in the wiper drive device.

[0026] Figure 4 1 is a flowchart showing the procedure of the wiper control process according to the present invention.

[0027] Figure 5 1 is a flowchart showing a conventional wiper control process for controlling the wipers.

[0028] Figure 6 This is a diagram showing the load on the wiper motor. Figure 6 (a) represents the motor load at low load. Figure 6 (b) shows the motor load at high load.

[0029] Explanation of symbols

[0030] 1: Wiper device

[0031] 2: Cars

[0032] 3: Wiper motor

[0033] 4: Linkage mechanism

[0034] 5, 6: Wiper arm

[0035] 7: Front glass

[0036] 11: Motor

[0037] 12: Speed ​​reduction mechanism

[0038] 13: Output shaft

[0039] 14: Crank Arm

[0040] 15: Wiper shaft

[0041] 16: Wiper blades

[0042] 21: Wiper drive device

[0043] 22: Power supply

[0044] 23: Ignition switch

[0045] 24: Wiper switch

[0046] 31: Power circuit

[0047] 32: CPU

[0048] 33: IG switch input circuit

[0049] 34: Wiper switch input circuit

[0050] 35: Motor drive circuit

[0051] 36: Position detection sensor

[0052] 37: Vehicle speed sensor

[0053] 38: Temperature sensor

[0054] 41: ROM

[0055] 42: RAM

[0056] 43: Timer

[0057] 44: IG Detection Department

[0058] 45: Wiper switch detection unit

[0059] 46: Wiper position detection unit

[0060] 47: Arm motion determination unit

[0061] 48: Motor action indication unit

[0062] 51: Motor current detection unit

[0063] 52: Motor load calculation unit

[0064] 53: Motor load determination unit

[0065] 54: Wiper action determination unit

[0066] 55: Motor speed detection unit

[0067] 56: Vehicle speed detection unit

[0068] 57: Temperature detection unit

[0069] 58: Wiper action correction unit

[0070] L: Downward reverse position

[0071] S1~S8, S11~S15: Steps

[0072] ST: Save Location

[0073] U: Upward reverse position

[0074] X: Difference between outgoing load and return load DETAILED DESCRIPTION

[0075] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Figure 1 1 is an explanatory diagram showing the structure of a wiper device to which a wiper control method and a control device according to an embodiment of the present invention are applied. Figure 1 As shown, the wiper device 1 is mounted on an automobile (vehicle) 2 and driven by a wiper motor 3. The wiper motor 3 is connected to a pair of wiper arms 5 and 6 via a link mechanism 4. The wiper motor 3 includes a motor unit 11 using a DC brush motor and a speed reduction mechanism unit 12 that reduces the speed of the motor unit 11 and outputs the speed. In addition, the motor used for the motor unit 11 is not limited to a DC brush motor, and may be a brushless motor or other forms of motors.

[0076] The speed reduction mechanism 12 houses a speed reduction mechanism using a worm gear. The motor rotating shaft extends from the motor part 11 to the speed reduction mechanism 12, and a worm (not shown) is fixed to the motor rotating shaft. An output shaft 13 is fixed to a worm wheel (not shown) meshing with the worm. A crank arm 14 is mounted on the output shaft 13, and the crank arm 14 is connected to the connecting rod mechanism 4. The connecting rod mechanism 4 is formed with a pair of wiper shafts 15 as a fulcrum, and the crank arm 14 is rotated forward and reversely by rotating the motor part 11 forward and reversely, so that the pair of wiper arms 5 and 6 are swung with the wiper shaft 15 as a fulcrum.

[0077] Wiper blades 16 are detachably mounted on the wiper arms 5 and 6. The wiper arms 5 and 6 perform a reciprocating wiping action in a wiping area between an upper reversal position U and a lower reversal position L set on the front glass (windshield) 7. At this time, the movement from the lower reversal position L to the upper reversal position U becomes an outward movement, and the movement from the upper reversal position U to the lower reversal position L becomes a return movement. When the wiper device 1 is not in use, the wiper arms 5 and 6 and the wiper blades 16 are stopped and stored in a storage position ST set below the lower reversal position L.

[0078] In the wiper device 1 , the operations of the wiper arms 5 , 6 are controlled by the wiper driving device 21 . Figure 2 2 is a block diagram showing the structure of the wiper drive device 21, and the wiper drive device 21 is controlled by the control method of the present invention. Figure 2 As shown, the wiper drive device 21 receives power supply from a power source (battery) 22 and is electrically connected to an ignition switch 23 or a wiper switch 24 disposed in the vehicle interior. The wiper switch 24 has mode positions of LO, HI, and INT. The wiper drive device 21 receives the switch operation of the driver and controls the operation of the wiper motor 3, so that the wiper arms 5 and 6 operate according to each mode.

[0079] The wiper drive device 21 includes a power supply circuit 31, a central processing unit (CPU) (central computing unit: wiper control device) 32 as a wiper control component, an IG (ignition) switch input circuit 33, a wiper switch input circuit 34, a motor drive circuit 35, and a position detection sensor 36. In addition, a vehicle speed sensor 37 for detecting the speed of the vehicle 2 and a temperature sensor 38 for detecting the outside air temperature are connected to the wiper drive device 21. The vehicle speed sensor 37 and the temperature sensor 38 are provided in the vehicle 2 separately from the wiper device 1.

[0080] The power supply circuit 31 converts the voltage of the power supply 22 into the operating voltage of the CPU 32 and supplies it to the CPU 32. The CPU 32 has a read-only memory (ROM) 41 or a random access memory (RAM) 42, a timer 43, etc. In the ROM 41, various control programs or data such as a program for implementing the control method of the present invention are stored. When the IG switch 23 of the automobile 2 is turned on (ON), the IG switch input circuit 33 outputs a signal indicating that it is turned on to the CPU 32. When the wiper switch 24 is turned on (LO, HI, INT), the wiper switch input circuit 34 outputs a signal corresponding to each mode to the CPU 32. The motor drive circuit 35 has a switching element such as a field effect transistor (FET) and controls the power supply to the wiper motor 3. The position detection sensor 36 is a sensor for detecting the position of the wiper blade 16 based on the motor rotation angle, and a magnetic resistance sensor is used here.

[0081] Corresponding to the position detection sensor 36, a magnet for rotation detection that is magnetized with N and S poles in the circumferential direction is provided on the output shaft 13 of the speed reduction mechanism 12, and a magnetic resistance sensor is arranged close to this magnet. When the wiper motor 3 is driven, the magnet for rotation detection also rotates along with the rotation of the output shaft 13, and the position detection sensor 36 outputs a signal every time the magnetic pole of the magnet for rotation detection is switched. This signal is sent to the CPU 32, and by performing data processing on this signal, the position of the wiper blade 16 is calculated and detected. In addition, as the position detection sensor 36, a Hall integrated circuit (IC) or the like can also be used.

[0082] The CPU 32 is provided with, in addition to the ROM 41 and the like, an IG detection unit 44 that receives a signal from the IG switch input circuit 33 to start the CPU 32, a wiper switch detection unit 45 that receives a signal from the wiper switch input circuit 34 to detect the operation state of the wiper switch 24, and a wiper position detection unit 46 that receives a signal from the position detection sensor 36 to identify the current position of the wiper arms 5 and 6. Furthermore, the CPU 32 is provided with an arm motion determination unit 47 that determines the motion control state of the wiper arms 5 and 6 based on the operation state of the wiper switch 24 or the current position of the wiper arms 5 and 6, and a motor motion instruction unit 48 that instructs the motor drive circuit 35 to operate the wiper motor 3 based on the determination of the arm motion determination unit 47.

[0083] Figure 3The block diagram shows the structure of the arm motion determination unit 47. The arm motion determination unit 47 is provided with: a motor current detection unit 51 for detecting the amount of current supplied to the wiper motor 3; a motor load calculation unit 52 for calculating the load of the motor based on the amount of motor current supplied or the motor rotation speed, the vehicle speed, the temperature, etc. detected by the motor current detection unit 51; and a motor load determination unit 53 for comparing the calculated motor load with a predetermined threshold value to determine the load state (high or low). Furthermore, the arm motion determination unit 47 is also provided with: a wiper motion determination unit 54 for determining the current motion state (outward or return) of the wiper arms 5 and 6; a motor rotation speed detection unit 55 for detecting the rotation speed of the wiper motor 3 based on the signal from the position detection sensor 36; a vehicle speed detection unit 56 for detecting the current speed of the car 2 based on the signal from the vehicle speed sensor 37; and a temperature detection unit 57 for detecting the current external temperature based on the signal from the temperature sensor 38. Furthermore, the arm operation determination unit 47 is provided with a wiper operation correction unit 58 that adjusts the rotation speed or rotation angle of the wiper motor 3 based on the wiper operation direction and motor load, and corrects the operation of the wiper arms 5 and 6 .

[0084] The wiper device 1 is operated and controlled by the wiper driving device 21 as follows. Figure 4 FIG. 2 is a flowchart showing the procedure of the wiper control process according to the present invention, which is executed by the CPU 32. FIG. Figure 4 In the process of the routine, if the ignition switch 23 is turned on (ON) and the wiper switch 24 is turned on (ON), it is first determined whether the wiper motor 3 is in motion (S1). The CPU 32 determines whether the wiper motor 3 is currently in motion through the wiper motion determination unit 54 of the arm motion determination unit 47. When the wiper motor 3 is not working, that is, when the motor is stopped, the routine is directly exited. On the other hand, when the wiper motor 3 is working, the routine enters S2, and the wiper motion determination unit 54 determines whether the wiper arms 5 and 6 are in the forward motion.

[0085] If it is determined in S2 that the wiper arms 5 and 6 are not in forward motion, the routine proceeds to S3 to determine whether they are in return motion. For example, if the wiper arms 5 and 6 reach the reverse position and it is determined in S3 that they are not in return motion, the routine is directly exited. If it is determined in S3 that the wiper arms 5 and 6 are in return motion, the routine proceeds to S4 to calculate the motor load (return load) of the return motion through the motor load calculation unit 52, and the routine is exited. At this time, the return motion load is estimated based on the motor supply current or the motor speed, the vehicle speed, the temperature, etc.

[0086] On the other hand, when it is determined that the wiper arms 5 and 6 are in the forward motion, the process proceeds to S5, calculates the current motor load, and determines whether it is in the "high load" area. The processing of S5 is performed by the motor load calculation unit 52 and the motor load determination unit 53. The motor load calculation unit 52 compares the motor load (forward load) calculated based on the motor supply current or the motor speed, the vehicle speed, the air temperature, etc. with a specified threshold value to determine the load state. At this time, the threshold value for determining whether it is a high load (for example, **% of the motor rating) is pre-set based on the vehicle type or the blade shape, and is stored in the ROM 41. When the forward load exceeds the threshold value and it is determined to be a high load state in S5, the process proceeds to S6, and the wiper action correction unit 58 implements a high load correction process (the first load processing correction).

[0087] In the high-load correction process of S6, the wiper action correction unit 58 calculates the correction amount of the rotation speed or rotation angle of the wiper motor 3 based on the forward load calculated by the motor load calculation unit 52. The correction value (first correction value) at this time is also stored in the ROM 41 in the form of a mapping with the motor load as a parameter. Next, the arm action determination unit 47 instructs the motor drive circuit 35 to operate the wiper motor 3 in a form reflecting the calculated correction amount. For example, when the wiper device 1 is operated in a dry state of the front glass 7 and the motor load increases due to the friction resistance between the glass surface and the wiper blade 16, countermeasures such as increasing the output of the wiper motor 3 to maintain the wiping speed are taken. In this way, the wiper control corresponding to the state of the glass surface is performed, and a smooth and stable wiping action can be performed.

[0088] When the outbound load is below the threshold and it is determined in S5 that it is not a high load, the routine proceeds to S7 to confirm whether the calculation of the return load is completed. If the return load is not calculated, the routine exits and waits for the calculation of the return load in S4. On the other hand, if the return load is calculated after the processing of S4, the routine proceeds to S8, and the wiper operation correction unit 58 performs wind load correction processing (second load processing correction).

[0089] In the wind load correction process of S8, the difference X between the motor loads of the outgoing path and the returning path calculated by the motor load calculation unit 52 (see Figure 6), the wiper action correction unit 58 calculates the correction amount of the rotation speed or rotation angle of the wiper motor 3. The correction value (second correction value) at this time is also stored in the ROM 41 in the form of a mapping with the load difference X between the outgoing path and the return path as a parameter. Next, the arm action determination unit 47 instructs the motor drive circuit 35 to operate the wiper motor 3 in the form of reflecting the calculated correction amount. For example, when the wiper device 1 is operated while the automobile 2 is traveling at a high speed, when the wiper blade 16 is subjected to a strong traveling wind, the following countermeasures are taken, namely: the output of the wiper motor 3 is controlled based on the difference X between the outgoing path load and the return path load, the wiping speed is maintained, and the overrun of the upper reversal position is limited.

[0090] Thus, the wiper control corresponding to the state (strength) of the running wind can be performed, the influence of the wind can be suppressed, the wiping speed can be maintained stable, and the overrun of the upper reversal position can be suppressed. Moreover, the wind load correction here is different from the previous correction based only on the motor output detection. It is a correction based on the load estimation value calculated by combining the motor supply current or the motor speed, so the wiper action can be controlled with higher precision, and the overrun control of the upper reversal position can also be performed with higher precision.

[0091] Thus, in the wiper control of the present invention, the high load caused by the state of the wiping surface is judged on the outgoing path (S2→S5), and the wind load caused by the running wind is corrected according to the difference X between the outgoing path and the return path (S7→S8). Moreover, the high load and the wind load are both calculated by load estimation operation using the motor supply current or the motor speed, the vehicle speed, the air temperature, etc. (S6, S8). In addition, the high load correction process (S5~S8) is implemented with priority over the wind load correction process. Therefore, high load detection and wind load detection were previously determined separately based on different criteria, and it was difficult to simply compare the two. In contrast, the present invention uses the same load estimation calculation value for comparison based on the same criteria, which can reliably identify which of the glass surface load and the wind load has a greater impact, thereby improving the detection accuracy of the wiper wiping condition.

[0092] As a result, it is possible to implement high-precision wiper control according to the state of the glass surface, maintain the wiping speed and perform smooth and stable wiping, and further, it is possible to flexibly deal with the stick-slip of the reversal position and suppress overrun with higher precision. As a result, the upper reversal position can be brought closer to the pillar, a wider wiping area can be set than before, and the driver's field of vision can be improved.

[0093] The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the invention.

[0094] For example, the wiper device 1 is configured to drive two wipers on the driver's seat side and the passenger's seat side using one wiper motor 3, but the present invention can also be applied to a dual-motor wiper device in which two wipers are driven by different motors.

[0095] Industrial Availability

[0096] The present invention is applicable not only to automobile wiper devices but also to wiper devices of industrial machines and the like used at construction sites and the like.

Claims

1. A wiper control method, which is a control method for a wiper device, the wiper device comprising: Wiper blades, configured on the windshield of the vehicle; A wiper arm, on which the wiper blade is mounted, is driven back and forth between an upper reversal position and a lower reversal position set on the windshield; as well as A motor is used to drive the wiper arm, and the wiper control method is characterized by: detecting a forward load generated by the motor when the wiper blade moves from the lower reversal position to the upper reversal position, When the forward load of the motor exceeds a predetermined threshold, the movement of the wiper arm is corrected by a first correction value set based on the forward load. When the outbound load is equal to or less than the threshold value, the operation of the wiper arm is corrected by a second correction value set based on a wind load of the motor generated by wind applied to the vehicle while the vehicle is traveling.

2. The wiper control method according to claim 1, characterized in that: The wind load is calculated based on a difference between the outward load and a circuit load generated by the motor when the wiper blade moves from the upper reversal position to the lower reversal position.

3. The wiper control method according to claim 2, characterized in that: The outbound load and the return load are calculated based on the amount of current supplied to the motor, the voltage applied to the motor, the running speed of the vehicle, and the outside temperature.

4. A wiper control device, which is a control device for controlling the operation of a wiper device, the wiper device comprising: Wiper blades, configured on the windshield of the vehicle; A wiper arm, on which the wiper blade is mounted, is driven back and forth between an upper reversal position and a lower reversal position set on the windshield; as well as A motor is used to drive the wiper arm, and the wiper control device is characterized by comprising: a motor load calculation unit for detecting a load generated by the motor when the wiper blade moves on the windshield; a motor load determination unit that compares a forward load generated by the motor when the wiper blade moves from the lower reversal position to the upper reversal position with a predetermined threshold value; and The wiper action correction unit corrects the action of the wiper arm with a first correction value set based on the outgoing load when the outgoing load of the motor exceeds a prescribed threshold value, and corrects the action of the wiper arm with a second correction value set based on the wind load of the motor generated by the wind to which the vehicle is subjected when traveling when the outgoing load is below the threshold value.

5. The wiper control device according to claim 4, characterized in that: The motor load calculation unit calculates a forward load generated by the motor when the wiper blade moves from the lower reversal position to the upper reversal position and a reverse load generated by the motor when the wiper blade moves from the upper reversal position to the lower reversal position. The wiper operation correction unit calculates the wind load based on a difference between the outbound load and the inbound load.

6. The wiper control device according to claim 5, characterized in that: The motor load calculation unit calculates the outbound load and the inbound load based on an amount of current supplied to the motor, a voltage applied to the motor, a running speed of the vehicle, and an outside temperature.

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