Windscreen wiper device

Abstract

Windscreen wiper device comprising: a drive source (18) that generates a motive force by being supplied with energy; a wiper arm (24) to which a motive force from the drive source (18) is transmitted, the wiper arm (24) being coupled to a windscreen wiper blade (28); a first control section (58) that, during intermittent operation, controls an energy supply to the drive source such that the windscreen wiper blade (28) wipes back and forth between a first reset position and a second reset position on a windscreen (12), and stops a movement for a predetermined duration at the first reset position, and that performs a position retention control which controls an energy supply to the drive source such that the stopped windscreen wiper blade (28) is retained in a position at which the windscreen wiper blade (28) is stopped;and a second control section (58) which suspends the position retention control by the first control section (58) in a case when it is determined that a current flowing into the drive source (18) has increased by a predetermined value or more while the wiper blade (28) is moving in the direction of the first reset position within a predetermined range in a vicinity of the first reset position.

Description

BACKGROUND Technical area

[0001] The present disclosure relates to a windshield wiper device. State of the art

[0002] Japanese patent application (JP-A) No. 2010-159055 discloses a method described as a position retention control, in which the rotational force of a windshield wiper motor is controlled such that a downward rotational force is applied to a windshield wiper to retain it in a lower reset position when the wiper has been stopped in that position. This position retention control prevents the windshield wiper, stopped in the lower reset position, from being pushed upward from that position by the pressure of the airflow.

[0003] However, if an obstruction or impediment exists within a wiping area just before the lower reset position, the obstruction will cause the wiper blade to move towards the lower reset position, arriving at it in a state where the wiper blade, wiper arm, and linkage mechanism are bent. If position retention control is performed in this bent state, an excessive load is placed on the wiper motor, causing a high current to flow, which could lead to premature wear or malfunction of the wiper motor. There is also a possibility that excessive load on the wiper blade, wiper arm, and linkage mechanism could cause malfunctions. SUMMARY

[0004] It is an objective of the present disclosure to provide a windscreen wiper device capable of preventing a load applied to the windscreen wiper device in cases where an obstruction is present in the vicinity of a reset position where a windscreen wiper blade is stopped for a predetermined duration.

[0005] A first aspect of the present disclosure is a windshield wiper device comprising: a drive source that generates a motive force by being supplied with energy; a wiper arm to which a motive force is transmitted from a drive source, the wiper arm being coupled to a windshield wiper blade; a first control section that, during an intermittent operation, controls an energy supply to the drive source such that the windshield wiper blade wipes back and forth between a first reset position and a second reset position on a windshield, and stops a movement for a predetermined duration at the first reset position, and that performs a position retention control that controls the energy supply to the drive source such that the stopped windshield wiper blade is retained in a position at which the windshield wiper blade is stopped;and a second control section that interrupts the position retention control by the first control section in a case where a current flowing into the drive source is detected to have increased to a predetermined value or more, while the wiper blade is moving towards the first reset position within a predetermined region in a vicinity of the first reset position.

[0006] In the first aspect, during intermittent operation, the first control section regulates the energy supply to the drive source such that the wiper blade wipes back and forth between the first reset position and the second reset position on the windshield, stopping at the first reset position for a predetermined duration. It should be noted that if an obstacle or obstruction is present in the vicinity of the first reset position, where the wiper blade stops for the predetermined duration after encountering the obstacle or obstruction, the wiper blade would move towards the first reset position in a state where the obstruction causes the wiper blade and wiper arm to bend.

[0007] To counteract this, the second control section interrupts the position retention control by the first control section in cases where it detects that the current flowing into the drive source has increased by a predetermined value or more, as the wiper blade moves towards the first reset position within the predetermined area surrounding the first reset position. Therefore, in cases where an obstruction is present within the predetermined area surrounding the first reset position, the fact that the wiper blade has encountered the obstruction is detected as an increase in the current flowing into the drive source by a predetermined value or more.

[0008] The second control section interrupts the position retention control initiated by the first control section when it detects that the current flowing into the drive source has increased by a predetermined value or more. This prevents an excessive load from being applied to the wiper assembly, which would otherwise cause the position retention control to operate in a state where the obstruction would cause the wiper blade and arm to bend. Therefore, the first aspect prevents a load from being applied to the wiper assembly in cases where an obstruction is present near a reset position, where the wiper blade is stopped for a predetermined duration.

[0009] A second aspect of the present disclosure is the windscreen wiper device of the first aspect, wherein: the second control section increments a count each time it detects that the current flowing into the drive source has increased while the windscreen wiper blade moves toward the first reset position within the predetermined range, and the second control section determines that an increase of the predetermined value or more has been detected when the count becomes greater than or equal to a threshold value. This enables an increase in the current flowing into the drive source by the predetermined value or more to be detected precisely without being affected by an instantaneous increase in the current flowing into the drive source or the like.

[0010] A third aspect of the present disclosure is the windscreen wiper device of the first or second aspect, wherein: the first control section performs the position retention control at the position where the windscreen wiper blade was stopped in a case where the windscreen wiper blade stopped before reaching the first reset position; and in a case where it is detected that the current flowing into the drive source has increased by a predetermined value or more while the windscreen wiper blade is moving in the direction of the first reset position within the predetermined range in the vicinity of the first reset position, the second control section sets instruction information to suspend the position retention control and holds the instruction information until a movement of the windscreen wiper blade in the direction of the second reset position begins.

[0011] For example, in cases where snow has accumulated at the first reset position, the wiper blade may stop before reaching it. If the first control section were to perform position retention control at the stopped position in cases where the wiper blade stopped before reaching the first reset position, the position retention control would be performed at a position different from the first reset position.

[0012] To address this, in the third aspect, if it is detected that the current flowing into the drive source has increased by the predetermined value or higher when the wiper blade moves towards the first reset position within the predetermined range surrounding the first reset position, the second control section issues instruction information to suspend the position retention control and holds this instruction information until the wiper blade begins moving towards the second reset position. Therefore, even if the wiper blade stops before reaching the first reset position, the position retention control can be suspended if it is detected that the current flowing into the drive source has previously increased by the predetermined value or higher.

[0013] Furthermore, any aspect from the first to the third aspect, such as in a fourth aspect, can be configured such that the first reset position is a lower reset position, and the second reset position is an upper reset position. List of characters Fig. Figure 1 is a schematic view illustrating a configuration of a windscreen wiper device according to a first exemplary embodiment; Fig. Figure 2 is a block diagram that schematically illustrates an example of a windshield wiper control device configuration; Fig. Figure 3 is a flowchart illustrating an example of the processing of an intermittent operation according to the first exemplary embodiment; Fig. Figure 4 is a time diagram illustrating an example of an operation or operation of a windshield wiper device during intermittent operation in the first exemplary embodiment; Fig. 5 is an enlarged time graph showing a section of Fig. 4 illustrates; Fig. Figure 6 is a schematic representation illustrating a configuration of a windscreen wiper device according to a second exemplary embodiment; Fig. Figure 7 is a schematic representation illustrating a capture area of ​​accumulated snow overlapping a wiper area; Fig. Figure 8 is a flowchart illustrating an example of the processing of an intermittent operation according to the second exemplary embodiment; Fig. Figure 9 is a timing diagram illustrating an example of the operation of a windshield wiper device during intermittent operation in the second exemplary embodiment; and Fig. 10 is an enlarged time graph showing a section of Fig. 9 illustrates. DETAILED DESCRIPTION

[0014] A detailed explanation of an example of exemplary embodiments of the present invention follows, with reference to the drawings. First exemplary embodiment

[0015] As in Fig. As illustrated in Figure 1, this is a windshield wiper device. 100A According to a first exemplary embodiment, for example, a device for wiping a windshield 12 of a vehicle, such as a passenger vehicle. The windshield wiper mechanism 100A includes a pair of windshield wipers14 , 16 , a windshield wiper or wiper motor 18 , a connecting mechanism 20 and a windshield wiper control device 10 In the present exemplary embodiment, the wiper motor 18 a DC motor with brushes.

[0016] The windshield wiper 14 includes a wiper arm 24 , whose base end section is attached to a swivel shaft 42 is fixed, and a windshield wiper blade 28 , which includes a guide end section of the wiper arm 24 is coupled. The windshield wiper 16 includes a wiper arm 26 , whose base end section is equipped with a swivel shaft 44 is fixed, and a windshield wiper blade 30 , which includes a guide end section of the wiper arm 26 is coupled. The wiper arms 24 , 26 the windshield wiper 14 , 16 oscillate around the pivoting shafts42 , 44 , so that the wiper blades 28 , 30 over the windshield 12 move back and forth. The windshield wiper blades. 28 , 30 This wipes the windshield 12 .

[0017] The wiper motor 18 includes an output wave 32 , which is capable of reacting to a speed reduction mechanism 52 , which is primarily configured via a worm gear, to rotate forwards and backwards at reduced speed. The linkage mechanism 20 includes a crank arm 34 , a first connecting rod 36 , a pair of pivot levers 38 , 40 , the pair of swivel shafts 42 , 44 , and a second connecting rod 46 .

[0018] One end of the crank arm 34 is with the output wave 32 of the wiper motor18 fixed, and the other end of the crank arm 34 is pivotable with one end of the first connecting rod 36 coupled. The other end of the first connecting rod 36 It is pivotable with an intermediate section of the pivot lever. 38 coupled. One end section of the second connecting rod 46 It is pivotable with an end section of the pivot lever. 38 on the opposite side of the one with the swivel shaft 42 fixed end section coupled, and the other end section of the second connecting rod 46 It is pivotable with an end section of the pivot lever. 40 on the opposite side of the one with the swivel shaft 44 coupled to the fixed end section.

[0019] The pivot shafts 42 , 44 The wiper arms are pivotally supported by swivel brackets provided on the vehicle body. 24 ,26 are via the swivel shafts 42 , 44 with the ends of the pivot levers 38 , 40 on the side with which the swivel shafts 42 , 44 are fixed, coupled.

[0020] In the windshield wiper mechanism 100A according to the first exemplary embodiment, when the output shaft 32 of the wiper motor 18 When the output shaft is rotated forwards or backwards through a predetermined rotational angle range θ1, a rotational force is generated. 32 to the wiper arms 24 , 26 via the connection mechanism 20 transferred, and the windshield wiper blades 28 , 30 move across the windshield 12 between a lower reset position P2 and an upper reset position P1 accompanied by a back-and-forth swinging of the wiper arms 24 , 26. Various values ​​can be used as the value of the rotation angle range. θ1 according to the configuration of the connection mechanism of the windshield wiper device 100A and the like, and one example is θ1 = 140°.

[0021] In the present exemplary embodiment, a stowage position is used. P3 below the lower reset position P2 Provided. The windshield wiper blades. 28 , 30 are achieved by rotating the output shaft 32 by an angle of rotation θ2 from a state in which the windshield wiper blades 28 , 30 at the lower reset position P2 are located in the stowing position P3 moved. Different values ​​can be used as the rotation angle. θ2 according to the configuration of the connection mechanism of the windshield wiper device 100 and the like, and one example is θ2 = 10°.

[0022] In the first exemplary embodiment, as in Fig. Figure 1 illustrates what happens when the windshield wiper blades 28 , 30 at the stowing position P3 The crank arm is located there. 34 and the first connecting rod 36 a linear shape. If the crank arm 34 and the first connecting rod 36 Forming a linear shape, a predetermined position retention force acts on the wiper blades. 28 , 30 , which are located at the stowing position P3 are located so that the windshield wiper blades 28 , 30 be kept in a state that is located at the stowing position P3 is located, even when a small external force is applied. It should be noted that if the angle of rotation θ2 which is equal to 0°, is the lower reset position. P2 and the stowing position P3match each other, and the windshield wiper blades 28 , 30 at the lower reset position P2 be stopped and stowed away.

[0023] The windshield wiper control device 10 includes a windshield wiper control section 22 to control the rotation of the wiper motor 18 The windshield wiper control section 22 is connected to the wiper motor 18 connected. The windshield wiper control section 22 includes an electronic windshield wiper control unit (ECU) 58 , a drive circuit 56 and a rotation angle sensor 54 .

[0024] The windshield wiper ECU 58 includes a CPU 58A , a storage 58B and a non-volatile memory section 58C The windshield wiper ECU 58 calculates the position of the wiper blades 28 , 30 on the windshield12 and the rotational speed of the output shaft 32 based on the rotational speed of the output shaft 32 of the wiper motor 18 as well as recording results from the rotation angle sensor 54 , which detects the angle of rotation and controls the drive circuit 56 , to change the rotational speed of the output shaft 32 to change according to the calculated position. The rotary angle sensor 54 is within the speed reduction mechanism 52 of the wiper motor 18 provided, and performs a detection by converting a magnetic field (a magnetic force) of a sensor magnet that is coupled to the output wave 32 rotates, in a stream.

[0025] In the present exemplary embodiment, because the rotational speed of the output shaft 32 of the wiper motor 28 via the speed reduction mechanism 52The speed and angle of rotation of the output shaft are reduced. 32 not the same as the rotational speed and angle of rotation of the wiper motor body. However, in the present exemplary embodiment, the wiper motor body and the speed reduction mechanism are 52 configured as an inseparable single body, and thus the rotational speed and angle of rotation of the output shaft are defined below. 32 as equivalent to the rotational speed and angle of rotation of the wiper motor 18 Considered. It should be noted that data relating to the control of the drive circuit 56 in advance in the storage section 58C be saved.

[0026] A windshield wiper switch 50 is connected to the windshield wiper ECU 58 the windshield wiper control section 22 via a main ECU 92 , which controls a vehicle's engine and the like. The windshield wiper switch 50switches on a power supply from a vehicle battery to the wiper motor 18 ON and OFF. A rain sensor. 90 , which serves as a raindrop detection section, is connected to the windshield wiper ECU 58 the windshield wiper control section 22 via the main ECU 92 tied together.

[0027] A contact point of the windshield wiper switch 50 is capable of switching between a low-speed operating position (LOW) for low-speed operation of the wiper blades 28 , 30 , a high-speed operating position (HIGH) for high-speed operation of the windshield wiper blades 28 , 30 , an interval operating position (INT) for interval operation of the windshield wiper blades 28 , 30 in a defined cycle, an automatic operating position (AUTO) for operating the windshield wiper blades 28 , 30, when raindrops pass through the rain sensor 90 be detected and switch to a stationary position (OFF). The main ECU 92 detects the position of the contact point of the windshield wiper switch 50 , and sends a detection result as an instruction signal to the windshield wiper ECU. 58 via a signal input circuit 62 ( Fig. 2) out.

[0028] The rain sensor 90 is, for example, of the type of optical sensor that is mounted on the inside of a vehicle cabin, on the windshield 12 is provided, and detects whether drops or the like are on the surface of the windshield. 12 are located. For example, the rain sensor includes 90An LED configured as an infrared radiation emitter, a photodiode configured as an infrared radiation receiver, a lens forming an optical path for infrared radiation, and a control circuit. Infrared radiation emitted from the vehicle cabin side towards the outside of the vehicle by the LED is completely absorbed by the windshield. 12 reflected when the surface of the windshield 12 It is dry, however, if water droplets form on the surface of the windshield 12 Some of the infrared rays pass through the water droplets and disappear outwards, which increases the reflection rate through the windshield. 12 The amount of infrared radiation incident on the photodiode, which configures the infrared radiation receiving element, is reduced. The control circuit detects whether water droplets are present on the surface of the windshield. 12are located, based on this decrease in the amount of infrared radiation. It should be noted that although in the present exemplary embodiment the rain sensor 90 While a raindrop detection section that uses infrared radiation is provided, it is not limited to this. For example, an in-vehicle camera can be used separately from the rain sensor. 90 be provided that uses infrared radiation.

[0029] The windshield wiper ECU 58 turns the wiper motor 18 at high speed, when the contact point position of the windshield wiper switch changes 50 , which is entered as an instruction signal, is in the high-speed operating position, and rotates the wiper motor. 18 at low speed, when the contact point position of the windshield wiper switch changes 50, which is entered as an instruction signal, is in the low-speed operating position. When the contact point position of the windshield wiper switch 50 , which is entered as an instruction signal, is in the interval operating position, rotates the windshield wiper ECU 58 the wiper motor 18 intermittently, so that the wiper blades 28 , 30 between the upper reset position P1 and the lower reset position P2 move back and forth, and at the lower reset position P2 Stop for a predetermined duration. When the contact point position of the windshield wiper switch changes. 50 , which is entered as an instruction signal, is in the automatic operating position, controls the windshield wiper ECU 58 the speed of the wiper motor 18 based on signals that correspond to the amount of rain detected by the rain sensor 90The recorded raindrops will be displayed.

[0030] As in Fig. As illustrated in Figure 2, the windshield wiper ECU 58 Energy of a battery 80 via a diode 68 supplied, and the voltage of the battery 80 The supplied energy is measured via a voltage sensing circuit. 60 , which are between the diode 68 and the windshield wiper ECU 58 is provided, is recorded, and the recording result is sent to the windshield wiper ECU. 58 is issued.

[0031] One terminal (the “+” terminal) of an electrolytic capacitor C1 is between the diode 68 and the windshield wiper ECU 58 connected, and the other terminal (the “-” terminal) of the electrolytic capacitor C1 is grounded. The electrolytic capacitor C1 is a capacitor used to power the windshield wiper ECU. 58to stabilize. For example, the electrolytic capacitor protects C1 the windshield wiper ECU 58 by accumulating sudden high voltages, such as overvoltages, and discharging to ground.

[0032] The rotation angle sensor 54 for detecting the magnetic field of a sensor magnet 70 , which changes according to a rotation of the output shaft 32 The change is related to the windshield wiper ECU. 58 connected. The windshield wiper ECU 58 detects the position of the windshield wiper blades 28 , 30 on the windshield 12 by calculating the rotation angle of the output shaft 32 based on the data from the rotation angle sensor 54 output signal.

[0033] Furthermore, the windshield wiper ECU refers to 58 on in advance in the storage section 58C stored data regarding wiper motor speeds 18, which according to the positions of the wiper blades 28 , 30 are specified. The windshield wiper ECU 58 The drive circuit is then controlled. 56 , so that the rotation of the wiper motor 18 a rotational speed corresponding to the identified position of the wiper blades 28 , 30 becomes.

[0034] The drive circuit 56 includes a propulsion device 56A , which provides a control signal for switching switching elements of a driver 56B ON and OFF based on a control signal from the windshield wiper ECU 58 is entered, generated, and the driver 56B This causes a current to flow through a coil of the wiper motor. 18 This is accomplished by switching the switching elements ON and OFF according to the direction set by the drive device. 56A output control signal. The driver 56BIt is configured, for example, by four FETs.

[0035] A reverse connection protection circuit 64 and an interference suppression coil 66 are between the drive circuit 56 and the battery 80 , which serves as an energy source, and an electrolytic capacitor C2 is in parallel with the drive circuit 56 connected. The interference suppression coil 66 prevents a switching of the drive circuit 56 generated interference signal. The electrolytic capacitor C2 mitigates a problem caused by the drive circuit 56 It absorbs generated interference signals and accumulates sudden high voltages, such as overvoltages, and discharges them to ground, thus preventing excessive current from entering the control circuit. 56 flows.

[0036] The reverse connection protection circuit 64is a circuit for protecting elements that control the windshield wiper control device 10 configure when the positive electrode and the negative electrode of the battery 80 are connected in the opposite way, as in Fig. Figure 2 illustrates this. The reverse connection protection circuit serves as an example. 64 configured as a diode-connected FET, in which the drain terminal and the gate terminal of the FET are connected.

[0037] A chip thermistor RT, which detects a substrate temperature as a resistance value, is located on a substrate of the windshield wiper control device. 10The chip thermistor RT configures a type of voltage divider, and a voltage that changes based on the resistance value of the chip thermistor RT is output from an output terminal of the voltage divider configured by the chip thermistor RT. The windshield wiper ECU 58 calculates the temperature of the substrate of the windshield wiper control device 10 based on the voltage output from the voltage divider's output terminal, configured by the chip thermistor RT. In cases where this temperature exceeds a predetermined threshold, the windshield wiper ECU stops. 58 an operation of the windshield wiper control device 10 .

[0038] A current sensing section 82 , which supply a current (motor current) between the coil of the wiper motor 18 and the driver 56B detected, is between the battery80 and the source lengths of the respective switching elements that drive the driver 56B Configure, provided. The power sensing section. 82 includes a shunt resistor 82A with a resistance value in the range of 0.2 mΩ to several Ω, and an amplifier 82B , which creates a potential difference between the two terminals of the shunt resistor 82A , which are in accordance with the current of the driver 56B It changes, detects, and amplifies a signal representing the detected potential difference. The windshield wiper ECU 58 calculates a current value of the motor current using the current through the amplifier 82B output signal.

[0039] The following is an explanation regarding an operation or an operation of the first exemplary embodiment, initially a position retention control, which is carried out in a state in which the contact point of the windshield wiper switch is50 was switched to the intermittent operating position (INT), and the wiper blades 28 , 30 work intermittently with a fixed cycle.

[0040] During intermittent operation of the windshield wiper blades 28 , 30 The windshield wiper ECU confirms this. 58 a value that is set as a position retention control permission flag each time the wiper blades 28 , 30 at the lower reset position P2 Stop. In cases where a value for "allowed" has been set as the position retention control allow flag, position retention control is performed to stop the wiper blades. 28 , 30 at the lower reset position P2 to leave until the wiper blades 28 , 30 begin to move towards the upper reset position P1 to move.

[0041] Specifically, the windshield wiper ECU monitors... 58 in the position retention control, whether the position of the windshield wiper blades 28 , 30 , which are driven by the rotation angle sensor 54 The lower reset position is detected. P2 Whether or not the position of the wiper blades corresponds. 28 , 30 the lower reset position P2 This corresponds to the operation of the windshield wiper ECU. 58 the wiper motor 18 not. In cases where the position of the windshield wiper blades 28 , 30 above the lower reset position P2 The offset drives the windshield wiper ECU. 58 the wiper motor 18 to turn on the windshield wiper blades 28 , 30 to the lower reset position P2 to move downwards. In cases where the position of the wiper blades 28 ,30 below the lower reset position P2 The offset drives the windshield wiper ECU. 58 the wiper motor 18 to turn on the windshield wiper blades 28 , 30 to the lower reset position P2 to move upwards.

[0042] During position retention control, while the wiper blades 28 , 30 at the lower reset position P2 The wiper blades are stopped during intermittent operation. 28 , 30 in a stationary state at the lower reset position P2 held, even if an external force due to wind or the like acts on the wiper blades 28 , 30 It works. In the position retention control described above, the lower reset position is P2An example of an initial reset position. It should be noted that in cases where the position retention control permission flag has been set to a value indicating "unacceptable," the wiper blades will... 28 , 30 at the lower reset position P2 If the wiper motor has stopped, the position retention control described above will not be performed. The windshield wiper ECU 58 is therefore an example of a first control section, and the position retention control permission flag is an example of instruction information.

[0043] Next, an explanation regarding a function of the windshield wiper ECU will follow. 58 during intermittent operation of the windshield wiper blades 28 , 30 executed interval processing with reference to Fig. 3. In step 200 The windshield wiper ECU determines this. 58Whether intermittent operation is currently in progress or not. In cases where the contact point of the windshield wiper switch 50 If the system has been switched to a position different from the interval operating position (INT), a determination in step 200 negative, and interval processing is terminated.

[0044] In cases where the contact point of the windshield wiper switch is 50 is located in the interval operating position (INT), a determination in step 200 agree, and the processing proceeds step by step 202 on. In step 202 The windshield wiper ECU determines this. 58 , whether a current state of the windshield wiper device 100A one is or is not, in which the windshield wiper blades 28 , 30 on a return path during a movement from the upper reset position P1 towards the lower reset position P2is located. In cases where the current condition of the windshield wiper blades 100A one is in which the windshield wiper blades 28 , 30 on an outward-directed path with a movement from the lower reset position P2 towards the upper reset position P1 being located is a determination in step 202 negative, and the processing returns to step 200 back.

[0045] In cases where in step 202 If a provision is accepted, the processing proceeds to step 204 on. In step 204 The windshield wiper ECU determines this. 58 , whether the current position of the wiper blades 28 , 30 whether or not the count value is within a target range, which relates to an increase in the current of the wiper motor. 18to be monitored. In the present exemplary embodiment, the target count range is a region with an upper end at an upper end position. P4 (a position between the upper reset position P1 and the lower reset position P2 ), as in Fig. 1 is illustrated, and with a lower end at the lower reset position. P2 The target counter range corresponds to a range in which, if no obstruction exists within the target counter range, the motor current is set to decrease monotonically. It should be noted that the target counter range of the present exemplary embodiment is an example of a predetermined range.

[0046] In cases where the current position of the wiper blades 28 , 30 If the value is outside the target range, a determination is required in step 204negative, and the processing progresses step by step 206 further, where a count value is used to detect an increase in the motor current of the wiper motor. 18 The count is set to 0, and processing returns to step 1. 200 back. In cases where the current position of the wiper blades 28 , 30 If the value is within the target range, a determination is made in step 204 agree, and the processing proceeds step by step 208 on. In step 208 The windshield wiper ECU is included 58 a motor current measurement result from the current measurement section 82 , determines whether there is a change in motor current, and follows a path according to the result of this determination.

[0047] Specifically, in cases where the motor current drawn at this stage has increased compared to the previously drawn motor current, the processing proceeds from step 208to step 210 on, and in step 210 implements the windshield wiper ECU 58 The count value is increased by a predetermined value (for example, 1), and the processing continues with step 214 continues. In cases where the motor current drawn at this stage has decreased compared to the previously drawn motor current, the processing of step continues. 208 to step 212 on, and in step 212 The windshield wiper ECU pulls 58 a predetermined value (for example, 1) is subtracted from the count value, and the processing proceeds to step 214 continued. It should be noted that the minimum count value 0If subtracting the predetermined value from the count value would result in a negative number, the count value is set to 0. It should be noted that if the motor current measurement result is obtained for the first time within the target count value range, and in cases where the motor current measurement result obtained at this stage is the same as the previously obtained motor current measurement result, the processing proceeds to step 214 continues without changing the count value.

[0048] In step 214 The windshield wiper ECU determines this. 58 , whether the count value has reached or exceeded a threshold value N or not. In cases where the determination in step 214 If the processing is agreed, it proceeds step by step. 216 on. In step 216 The windshield wiper ECU 58The position retention control permission flag is set to a value indicating "unauthorized", and processing proceeds to step 218 continued. In cases where the determination in step 214 If negative, the step will be 216 skipped, and processing proceeds to step 218 on.

[0049] In this way, the windshield wiper ECU increments 58 the count value each time an increase in motor current is detected while the wiper blades are moving 28 , 30 over the target count range in the direction of the lower reset position P2move, and in cases where the count reaches or exceeds the threshold N, a determination is made that an increase in motor current of a predetermined value or above has been detected. This allows for the correction of an increase in motor current of a predetermined value or above, according to the wiper blades that are obstructing the movement. 28 , 30 is precisely recorded without being affected by temporary increases in motor current or the like.

[0050] In step 218 The windshield wiper ECU determines this. 58 , whether the windshield wiper blades 28 , 30 the lower reset position P2 have been reached or not. In cases where the determination in step 218 If negative, the processing returns to step 200 back, and the steps 200 until 218 are repeated until a determination is made in step 218is agreeable. If the determination in step 218 If the processing is agreed, it proceeds step by step. 219 continues, and the count value is set to 0.

[0051] In the next step 220 The windshield wiper ECU determines this. 58 , whether the position retention control permission flag has been set to the value indicating "unauthorized" or not. In cases where the determination in step 220 If it's negative, the processing continues step by step 222 on. In step 222 sets the windshield wiper ECU 58 The position retention control permission flag is set to the value indicating "allowed", and processing proceeds to step 224 continued. In cases where the determination in step 220 If the person agrees, the next step will be taken. 222 skipped, and processing proceeds to step 224 on.

[0052] In the processing described above, in cases where the count value reaches or exceeds the threshold N before the wiper blades 28 , 30 the lower reset position P2 to ensure that the position retention control permission flag is set to the value indicating "permissible" at the time the count value exceeds the threshold. N reaches or exceeds the threshold. In cases where the count value reaches or exceeds the threshold. N not reached or exceeded before the wiper blades 28 , 30 the lower reset position P2 To reach this point, the position retention control approval flag is set to the value indicating "permissible" at the time when the wiper blades 28 , 30 the lower reset position P2to achieve this. Subsequently, in cases where the position retention control permission flag has been set to the value indicating "permissible", position retention control is implemented by the windshield wiper ECU. 58 carried out, whereas in cases where the position retention control permission flag is set to the value indicating "unauthorized", position retention control is not carried out by the windshield wiper ECU. 58 carried out.

[0053] In the next step 224 The windshield wiper ECU determines this. 58 , whether the windshield wiper blades 28 , 30 have or have not begun an outward movement. In cases where the determination is negative, step 224 repeated until the determination is affirmative. In cases where the windshield wiper blades 28 , 30have begun an outward-directed movement, and the determination in step 224 If the processing is agreed, it proceeds step by step. 26 on. In step 226 sets the windshield wiper ECU 58 The position retention control permission flag is set to a value indicating "pending". Therefore, in cases where the position retention control permission flag was initially set to "forbidden", the position retention control permission flag remains in the "forbidden" state until the next back-and-forth movement begins. After the processing of the step 226 Once completed, the processing returns to step 200 Back. The windshield wiper ECU 58 , which performs the interval operation processing described above, is an example of a second control section.

[0054] The following is a further explanation regarding an operation or a function of the interval processing described above, with reference to Fig. 4 and Fig. 5. As in Fig. 4 is illustrated when the contact point of the windshield wiper switch 50 When switching from the stationary position (OFF) to the interval operating position (INT), the system is initially switched over a period of time. T1 A first outward movement (OPEN action) was performed, so that the windshield wiper blades 28 , 30 from the lower reset position P2 to the upper reset position P1 move. Fig. Figure 4 illustrates a case in which the windshield wiper blades 28 , 30 an obstruction during the first retraction (closing action) of the windshield wiper blades 28 , 30 from the upper reset position P1towards the lower reset position P2 during the next time period T2 meet.

[0055] In the Fig. 4 illustrated examples, and how detailed in Fig. As illustrated in Figure 5, the motor current, which has increased, begins to decrease during the first return stroke. After the wiper blades 28 , 30 Once the count value target range has been reached, the windshield wiper blades are affected. 28 , 30 The obstacle or obstruction disappears, and the motor current begins to increase again. The counter value begins to be implemented according to this increase in motor current, and when the counter value reaches and exceeds the threshold N, the position retention control allow flag is set to "forbidden". In this case, during the time period T3 , after the windshield wiper blades 28 , 30the lower reset position P2 have achieved, but have not implemented position retention control.

[0056] In cases where the windshield wiper blades 28 , 30 If an obstacle or obstruction is encountered in the target counting area during the return journey, the obstruction causes the windshield wiper blades to 28 , 30 at the lower reset position P2 arrive in a state where the windshield wiper blades 28 , 30 , the wiper arms 24 , 26 and the connection mechanism 20 are bent. If the position retention control is in a bent state of the wiper blades 28 , 30 , the wiper arm 24 , 26 and the connection mechanism 20 If this were carried out, it could put an excessive load on the wiper motor. 18This can result in a large current flowing, potentially leading to premature wear or malfunctions in the wiper motor. 18 It is also possible that excessive weight is applied to the wiper blades. 28 , 30 , the wiper arms 24 and 26 and the connection mechanism 20 Malfunctions may occur.

[0057] However, in the current exemplary embodiment, if the count value reaches or exceeds the threshold value N due to an increase in motor current, the position retention control permission flag is set to "unauthorized," thus disabling position retention control. This prevents excessive load from being applied to the wiper motor. 18 , the windshield wiper blades 28 , 30 , the wiper arms 24 , 26and the connection mechanism 20 is applied. Furthermore, the bending of the wiper blades is also addressed. 28 , 30 , the wiper arms 24 , 26 and the connection mechanism 20 mitigated, as if from Fig. 5 becomes apparent, in which the windshield wiper blades 28 , 30 something in the upward direction at the beginning of the time period T3 return.

[0058] The in Fig. 4 illustrated examples illustrate a case in which the windshield wiper blades 28 , 30 the obstruction did not occur during the second return movement during the time period T5 This occurs. In this case, the increase in motor current within the target count range is not repeated, and the wiper blades 28 , 30 reach the lower reset position P2, without the count value reaching or exceeding the threshold N. The position retention control permission flag is therefore set to "allowed", and position retention control is activated in the following time period. T6 carried out. Second exemplary embodiment

[0059] The following is an explanation concerning a second exemplary embodiment of the present disclosure. It should be noted that sections identical to those of the first exemplary embodiment are provided with the same reference numerals, and an explanation of these is omitted.

[0060] As in Fig. As illustrated in section 6, this is the windshield wiper device. 100B According to the second exemplary embodiment, a directly driven tandem-type windscreen wiper device, in which one windscreen wiper 14 via the driving force of a wiper motor 18Ais activated, and a windshield wiper 16 via the driving force of a wiper motor 18B is activated. A wiper arm 24 of the windshield wiper 14 is achieved via a speed reduction mechanism 52A transmitted and slowed-down driving force of the wiper motor 18A swiveled, and a wiper arm 26 of the windshield wiper 16 is achieved via a speed reduction mechanism 52B slowed and transferred driving force of the wiper motor 18B swiveled. In the windshield wiper mechanism 100B will the wiper motors 18A , 18B driven in such a way that the wiper arm 24 of the windshield wiper 14 and the wiper arm 26 of the windshield wiper 16 swivel together in the same direction.

[0061] The wiper motors 18A , 18Bare each equipped with a windshield wiper control section 22 connected, which drive the wiper motors 18A , 18B controls. The windshield wiper control section 22 includes drive circuits 56 (each a pre-driver) 56A and a driver 56B comprehensive), as well as a windshield wiper ECU 58 A rotary angle sensor 54A , which specifies the rotational speed and angle of rotation of an output shaft 32A of the wiper motor 18A detected, and a rotation angle sensor 54B , which specifies the rotational speed and angle of rotation of an output shaft 32B of the wiper motor 18B are recorded and are connected to the windshield wiper ECU. 58 tied together.

[0062] The windshield wiper ECU 58 calculates the respective positions of the wiper blades 28 , 30 on the windshield 12 based on signals from the rotary angle sensors 54A, 54B The windshield wiper ECU 58 controls the respective drive circuits 56 (the pre-driver 56A and the driver 56B) , to adjust the rotational speeds of the output shafts 32A , 32B to change according to the calculated positions. It should be noted that the rotary angle sensors 54A , 54B each within the speed reduction mechanisms 52A , 52B the wiper motors 18A , 18B are provided, and a magnetic field (magnetic force) from excitation coils or magnets that coordinates with the output waves 32A , 32B Rotate the energy, convert it into a current that is then measured. Control the rotational speed of the output shafts. 32A , 32B is with reference to a previously entered memory section 58C stored speed map performed by adjusting the speeds of the output shafts 32A , 32Baccording to the positions of the wiper blades 28 , 30 are specified.

[0063] Each of the drive circuits 56 (the pre-driver 56A and the driver 56B) It has the same configuration as the drive circuit described in the first exemplary embodiment. 56 Therefore, an explanation of this is omitted. If a signal corresponds to the contact point position of a windshield wiper switch... 50 into the windshield wiper ECU 58 The input is executed by the windshield wiper ECU. 58 a control according to the one from the windshield wiper switch 50 output signal. In particular, the windshield wiper ECU calculates 58 Rotational speeds for the output shafts 32A , 32B based on an instruction signal from the windshield wiper switch 50 and the aforementioned speed map. The windshield wiper ECU58 It also controls the drive circuits. 56 (the pre-driver 56A and the driver 56B) , to the output waves 32A , 32B to rotate at the calculated speeds.

[0064] The following is an explanation regarding an operation or function of the second exemplary embodiment, namely the detection of accumulated snow by the windshield wiper ECU. 58 as described in the second exemplary embodiment. As in Fig. 6 and Fig. As illustrated in figure 7, in the second exemplary embodiment, there is an upper end position. P5 a detection area of ​​accumulated snow between the lower reset position P2 and the upper end position P4 The target count range is set. The detection range for accumulated snow is between the upper end position. P5the detection area of ​​accumulated snow and the storage position P3 adjusted. While the windshield wiper blades 28 , 30 through the detection range of accumulated snow during a return movement (CLOSE action) of the windshield wiper blades 14 , 16 move, and when the windshield wiper blades 28 , 30 towards the stowing position P3 The windshield wiper ECU is triggered by the movement. 58 a detection of accumulated snow by monitoring whether accumulated snow is present or not, specifically by checking whether the windshield wiper blades 28 , 30 have encountered an obstacle, such as accumulated snow.

[0065] These are detailed procedures for determining whether accumulated snow is present on the windshield wiper blades. 28 , 30Whether or not it is present. Although these are not described in detail here, one example is a procedure in which the presence of accumulated snow is determined, specifically by determining whether the windshield wiper blades are present. 28 , 30 have been affected by accumulated snow or the like, in cases where a rotation of at least one of the output waves has occurred. 32A , 32B the wiper motors 18A , 18B stops when the wiper blades 28 , 30 move. An example of a significant accumulation of snow, where it is determined that accumulated snow is present, is indicated by the reference sign 84 in Fig. Figure 7 illustrates the windshield wiper ECU. 58 stops the movement of the windshield wiper blades 28 , 30In cases where accumulated snow has been determined to be present, a position retention control is used to hold back the wiper blades. 28 , 30 at the stopped position within the detection range of accumulated snow (the position when the rotation of at least one of the output waves 32A , 32B the wiper motors 18A , 18B (has stopped).

[0066] Next, an explanation regarding interval operation processing according to the second exemplary embodiment follows, with reference to Fig. 8. The in Fig. The interval processing described in step 8 differs from that of the first exemplary embodiment in that in cases where in step 218 If a determination is negative, the processing to step 230continues, and a determination is made as to whether accumulated snow is present or not, and a determination is made as to whether the windshield wiper blades 28 , 30 have been affected by an obstacle, such as accumulated snow, or not. In cases where the determination in step 230 If negative, the processing returns to step 200 back, and in cases where the determination in step 230 If the processing is agreed, it proceeds step by step. 219 on.

[0067] Further explanations regarding an operation or running of the interval processing described above follow, with reference to Fig. 9 and Fig. 10. Fig. Figure 9 illustrates a case in which the windshield wiper blades 28 , 30 during the first return movement (CLOSE action) of the windshield wiper blades 28 , 30from the upper reset position P1 towards the lower reset position P2 during the following time period T2 They met and determined that accumulated snow was present.

[0068] In the Fig. 9 illustrated examples, and how detailed in Fig. As illustrated in Figure 10, the motor current, which has increased, begins to decrease during the first return stroke. After the wiper blades 28 , 30 Once the count value target range has been reached, the windshield wiper blades are affected. 28 , 30The obstruction, and the motor current begins to increase again. The count value begins to be implemented concurrently with this increase in motor current, and at the point when the count value reaches or exceeds the threshold N, the position retention control allow flag is set to "forbidden". Subsequently, it is determined that accumulated snow is present within the accumulated snow detection range, and the wiper blades 28 , 30 They are stopped at positions further towards the upper side than the lower reset position. P2 Because the position retention control approval flag was already set to "inadmissible" at that time, the following will occur during the time period: T3 , after the windshield wiper blades 28 , 30 at positions further towards the upper side than the lower reset position P2 stopped, not provided.

[0069] After the windshield wiper blades 28 , 30 the obstruction in the counting range during the return journey, in cases where it is determined that accumulated snow is present in the detection range of accumulated snow, it is determined that accumulated snow is present, and the obstruction causes a movement of the windshield wiper blades 28 , 30 is stopped in a state where the windshield wiper blades 28 , 30 , the wiper arms 24 , 26 and a connecting mechanism 20 are bent. If the position retention control is in a bent state of the wiper blades 28 , 30 , the wiper arms 24 , 26 and the connection mechanism 20 If this were carried out, it could place an excessive load on the wiper motors. 18A , 18BThis can result in a large current flowing, potentially leading to premature wear or malfunctions in the wiper motors. 18A , 18B to lead to this. It is also possible that excessive load on the wiper blades could cause damage. 28 , 30 , the wiper arms 24 , 26 and the connection mechanism 20 Malfunctions may occur.

[0070] However, in the second exemplary embodiment, if the count value reaches or exceeds the threshold value N due to an increase in motor current, the position retention control permission flag is set to "unauthorized", which prevents the position retention control and thus allows an excessive load to be applied to the wiper motors. 18A , 18B , the windshield wiper blades 28 , 30 , the wiper arms 24 ,26 and the connection mechanism 20 is prevented, even in cases where it is determined that accumulated snow is present and movement of the windshield wiper blades is prevented. 28 , 30 is stopped at a position further towards the upper side than the lower reset position P2 Furthermore, a bending of the windshield wiper blades is observed. 28 , 30 , the wiper arms 24 , 26 and the connection mechanism 20 mitigated, as if from Fig. 10 becomes apparent, in which the windshield wiper blades 28 , 30 something in the upward direction at the beginning of the time period T3 return.

[0071] It should be noted that although an explanation was provided regarding an example in which the windshield wiper device 100Baccording to the second exemplary embodiment, a capture of accumulated snow is carried out by the windshield wiper device. 100A According to the first exemplary embodiment, it can also perform a capture of accumulated snow.

[0072] Although an explanation was provided regarding an example in which the wiper motor 18 configured with a DC motor with brushes, this is not limited to that, and the wiper motor 18 can be configured with a brushless motor.

[0073] Although an explanation has been provided regarding an example in which position retention control is performed at the lower reset position as an example of a first reset position, this is not limited to that, and the present disclosure can likewise be applied to a windscreen wiper device that performs position retention control at an upper reset position.

[0074] Furthermore, in the foregoing exemplary embodiments, although a determination of whether interval operation is required in step 200 The decision is made based on whether the windshield wiper switch is in use or not. 50 Whether or not the machine is in the interval operating position is not limited to this. Intermittent or interval operation can be any operation in which a pause of a predetermined duration occurs at a reset position (either the lower reset position).P2 or the upper reset position P1 ). For example, this applies in cases where the windshield wiper switch 50 is in the automatic operating position and the rain sensor 90 a small amount of rain has been detected, indicating that a pause of predetermined duration is required at a reset position (either the lower process position). P2 or the upper reset position P1 ) is present, and this action can be determined as an intermittent operation that is underway.

[0075] A windshield wiper device comprises: a first control section which, during intermittent operation, controls an energy supply to a drive source such that a windshield wiper blade moves back and forth between a first reset position and a second reset position on a windshield, and stops a movement from the first reset position for a predetermined duration, and which performs a position retention control which controls an energy supply to the drive source such that the stopped windshield wiper blade is retained in a position where the windshield wiper blade is stopped;and a second control section that suspends the position retention control by the first control section in a case where a current flowing into the drive source is detected to have increased to a predetermined value or more, while the wiper blade is moving towards the first reset position within a predetermined range in a vicinity of the first reset position.

Claims

[1] Windscreen wiper assembly, with: a power source (18) that generates a driving force by supplying it with energy; a wiper arm (24) to which a driving force from the drive source (18) is transmitted, wherein the wiper arm (24) is coupled to a windscreen wiper blade (28); a first control section (58) which, during intermittent operation, controls an energy supply to the drive source such that the wiper blade (28) wipes back and forth between a first reset position and a second reset position on a windshield (12), and stops a movement for a predetermined duration at the first reset position, and which performs a position retention control which controls an energy supply to the drive source such that the stopped wiper blade (28) is retained in a position at which the wiper blade (28) is stopped; and a second control section (58) which suspends the position retention control by the first control section (58) in a case when it is determined that a current flowing into the drive source (18) has increased by a predetermined value or more, while the wiper blade (28) is moving in the direction of the first reset position within a predetermined range in a vicinity of the first reset position. [2] Windscreen wiper device according to claim 1, wherein: the second control section (58) increments a count value each time it detects that the current flowing into the drive source (18) has increased while the wiper blade (28) moves towards the first reset position within the predetermined range, and the second control section (58) determines that an increase by the predetermined value or greater has been detected when the count value becomes greater than or equal to a threshold value. [3] Windscreen wiper device according to claim 1 or 2, wherein: the first control section (58) performs the position retention control at the position where the wiper blade (28) was stopped, in a case where the wiper blade (28) was stopped before reaching the first reset position; and In a case where it is detected that the current flowing into the drive source (18) has increased by a predetermined value or more, while the wiper blade (28) is moving towards the first reset position within the predetermined area in the vicinity of the first reset position, the second control section (58) sets instruction information to suspend the position retention control and holds the instruction information until a movement of the wiper blade (28) towards the second reset position begins. [4] Windscreen wiper device according to any one of claims 1 to 3, wherein the first reset position is a lower reset position and the second reset position is an upper reset position.

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