KR100705671B1 - Driving method of front wiper for vehicle - Google Patents

Abstract

The present invention relates to a wiper drive method, and more particularly, by using the rotation data of the worm wheel rotated by the motor drive by rotating the drive operation link of the wiper drive in a range within a predetermined angle within the fixed space of the wiper drive device The present invention relates to a vehicle front wiper driving method.

According to an aspect of the present invention, there is provided a method of driving a front wiper for a vehicle, the method including: receiving a wiper driving command according to a user's operation from a body control module of a vehicle; Driving a motor by setting a supply path of a battery power applied to a brush in contact with a commutator of the motor in a forward direction so that forward power is applied to a motor constituting a wiper drive according to the wiper driving command; Receiving an electric signal by detecting a change in magnetic force corresponding to an amount of rotation of a magnet provided at a center of a worm wheel which is rotated by a rotation of a worm gear formed on a motor rotation shaft from a magnetic field sensor when the motor is driven; Supply path of battery power applied to the brush so that the rotation direction of the worm wheel is inverted when the rotation angle data corresponding to the input electric signal is read out and the read rotation angle data coincides with the preset maximum and minimum rotation angle data of the worm wheel. It is characterized in that it comprises the step of changing the reverse direction to drive the motor.

Wiper Drive, Motor, Reverse, Magnetic Field Sensor

Description

Driving method of front wiper for vehicle {Driving method of front wiper for vehicle}

1 is a structural exploded perspective view of a front wiper driving apparatus is implemented wiper driving method according to the present invention.

FIG. 2 is a diagram for explaining an electrical configuration of the drive control means shown in FIG. 1; FIG.

3 is a flowchart illustrating a vehicle wiper driving method according to the present invention.

4 is a view for explaining a drive device and a link combination connected to the conventional front wiper device.

FIG. 5 is a circuit diagram for describing an operating state of the driving device illustrated in FIG. 4.

<Explanation of symbols for the main parts of the drawings>

100: rear case

110: motor 120: motor rotation shaft

130: worm gear 140: drive rotation shaft

150: worm wheel 160: recessed groove

200: magnet

300: motor drive control means

310: interface 320: regulator

330: magnetic field sensor 340: memory

350: microprocessor 360: motor driven drive

370: switching unit

400: front case

410 brush

The present invention relates to a wiper drive method, and more particularly, by using the rotation data of the worm wheel rotated by the motor drive by rotating the drive operation link of the wiper drive in a range within a predetermined angle within the fixed space of the wiper drive device The present invention relates to a vehicle front wiper driving method.

In general, the front window of the vehicle is provided with a front wiper device for wiping the rain or snow so as to secure the front view in the case of rain or snow.

That is, the commonly known front wiper device includes a link combination for rotating each of the wiper arms to which the blades are connected by driving the drive device provided inside the body supporting the lower portion of the front window. First, a conventional front wiper device will be described below.

4 is an enlarged perspective view illustrating a drive device and a link combination connected to the conventional front wiper device.

Accordingly, the conventional front wiper device includes a driving device 500 provided inside the body supporting the lower portion of the front window, and a wiper arm 700 connected with the blade 800 by driving the driving device 500. It consists of a link assembly 600 to rotate.

That is, the driving device 500 is provided in the case 510 fixed to the inside of the body and the case 510 is provided in the inside of the worm wheel is rotated through the rotation of the worm gear connected to the motor and protrudes from the center of the worm wheel It includes a drive rotary shaft 530 is connected to the drive operation link 520 to the top.

In addition, the link assembly 600 is fixed to the upper and the body of the drive device 500, both sides of the fixing bar 610 is provided with two arm rotation shaft 611 to which the wiper arm 700 is connected, and both sides Arm operating link 620 provided on the lower portion of the arm rotation shaft 611, and the end and the inner side of the drive operation link 520 is connected to the angle changeable and the outer side is the angle change with the arm operation link 620 It consists of both links 630 that are possibly connected.

Hereinafter, an operating state of the front wiper device configured as described above will be described with reference to FIG. 5.

First, as shown in FIG. 5, when the wiper switch is pulled to the first stage (low speed), the motor rotates at a low speed because the current of the battery is grounded through the brush B1, the armature coil, and the brush B3 via +1.

If the wiper switch is pulled to the second stage (high speed), the current in the battery is grounded through brush B2, armature coil and brush B3 via +2, but in this case the number of conductors in the armature coil is less than between brush B1, B3. The motor rotates at high speed.

As the motor rotates at a low speed or a high speed as described above, the worm wheel and the driving rotation shaft 530 provided at the center thereof are interlocked by rotating the worm gear. Then, the driving operation link 520 connected to the driving rotary shaft 530 rotates, and at the same time, the two side links 630 are rotated at both sides so that both arm operating links 620 and the arm rotating shaft 611 repeat at a predetermined angle. Is rotated. Therefore, the wiper arms 700 fixed to both arm rotation shafts 611 wipe the front window by performing each rotation.

By the way, in the case of using the front wiper device configured as described above, there was a problem that the drive operation link constituting the drive device to secure a lot of space around the 360 degree rotational movement.

That is, the driving device is mounted inside the lower body supporting the front window, and the space in which the driving device is mounted is a space close to the instrument panel, and includes various electronic devices, wirings, and ducts. The mounting space of the peripheral device is relatively narrowed by securing the mounting space of the driving device due to the rotation of.

Therefore, there is a lot of limitations in the design of the vehicle because it is not possible to mount the peripheral devices sufficiently in the space where the drive device is mounted.

The present invention has been invented to solve the above problems, and an object of the present invention is to provide a front wiper driving method for forward and reverse rotation of the driving operation link only within a predetermined angle so as to minimize the mounting space.

In addition, an object of the present invention is to provide a front wiper driving method capable of uniformly realizing the wiping speed of the wiper by controlling the amount of current applied to the motor according to the operation mode of the wiper.

Furthermore, the present invention allows the motor to be driven at an optimum speed for the rotational position of the wiper blade, for example, the lowest or highest position of the wiper blade, or a middle position thereof, thereby driving the front wiper to improve the quality of the wiping of the wiper. The purpose is to provide a method.

According to an aspect of the present invention, there is provided a method of driving a front wiper, the method including: receiving a wiper driving command according to a user operation from a body control module of a vehicle; Driving a motor by setting a supply path of a battery power applied to a brush in contact with a commutator of the motor in a forward direction so that forward power is applied to a motor constituting a wiper drive according to the wiper driving command; Receiving an electric signal by detecting a change in magnetic force corresponding to an amount of rotation of a magnet provided at a center of a worm wheel which is rotated by a rotation of a worm gear formed on a motor rotation shaft from a magnetic field sensor when the motor is driven; Supply path of battery power applied to the brush so that the rotation direction of the worm wheel is inverted when the rotation angle data corresponding to the input electric signal is read out and the read rotation angle data coincides with the preset maximum and minimum rotation angle data of the worm wheel. It is characterized in that it comprises the step of changing the reverse direction to drive the motor.

The invention will become more apparent through the preferred embodiments described below with reference to the accompanying drawings. Hereinafter will be described in detail to enable those skilled in the art to easily understand and reproduce through these embodiments.

1 is a structural exploded perspective view of a vehicle front wiper driving apparatus is implemented wiper driving method according to the present invention.

The vehicle front wiper drive device in which the wiper driving method according to the present invention is implemented is provided with a worm wheel 150 that is rotated through the driving of the motor 110 and a driving rotation shaft 140 protrudes rearward in the center thereof, and the front is opened. The rear case 100, the magnet 200 is provided at the front center of the worm wheel 150 and rotated, and the magnetic force according to the rotation of the magnet 200 is wrapped around the front of the rear case 100 It consists of a front case 400 is provided with a motor drive control means 300 for detecting the change in forward and reverse rotation of the motor (110).

That is, the rear case 100 is provided with a worm wheel 150 that can be rotated forward and backward through the rotation of the worm gear 130 formed on the motor rotation shaft 120 of the motor 110 therein. In the embodiment of the present invention, the motor shaft 120 includes a commutator 121, the brush 410 for supplying power to the commutator in the upper and lower portions of the rear case 100 is mounted to the commutator 121 ) Is formed with a recessed groove 160 into which it is inserted.

In addition, the driving rotation shaft 140 provided at the rear center of the worm wheel 150 protrudes through the rear case 100, and serves as a central rotation axis in the rotation of the worm wheel 150.

In addition, the magnet 200 is a means for implementing the features of the present invention, the rear is to be inserted into the front of the worm wheel 150 is fixed to be provided to protrude forward.

On the other hand, the front case 400 is to cover the front of the rear case 100, but not shown in the drawing, but a power supply terminal (not shown) for supplying power to the motor drive control means 300 to be described later and In addition, a connection port (not shown) connected to the vehicle body control module and a cable is provided.

And the rear of the front case 400, the brush 410 for supplying power to the commutator 121 of the motor through the motor drive control means 300 is provided. That is, in the embodiment of the present invention, the brushes 410 are protruded in the front case 400 corresponding to the recessed groove 160 position, and the two brushes 410 face each other so as to apply power to the commutator 121. It is arranged.

Therefore, when combining the rear case 100 and the front case 400 according to the configuration as described above, the rear of the front case 400 is spaced at a predetermined interval and the rear protruding brush 410 protruding to the rear Each of the recessed grooves 160 of the case is inserted into contact with the commutator 121 so that the motor 110 is reversely rotated by the power supplied through the brush 410.

In addition, the rear surface of the front case 400 is provided with a motor drive control means 300 of the present invention for detecting the change in the magnetic force according to the rotation of the magnet 200 to rotate the motor 110 forward and backward.

That is, the motor drive control means 300 is firmly fixed to the rear surface of the front case 400 by fitting means such as protrusions or fastening means such as bolts, and the like will be described with reference to FIG. 2.

In the embodiment of the present invention, the motor drive control means 300 controls to rotate the motor forward and backward according to the rotation angle of the worm wheel 150 as described above, and the interface 310 and the regulator 320 are large, The magnetic field sensor 330 includes a memory 340, a microprocessor 350, a motor driving drive 360, and a switching unit 370.

The interface 310 is connected to the body control module (BCM) of the vehicle through a connection port provided in the front case 400.

And the regulator 320 is a means for stably supplying the power of the battery to the overall motor drive control means 300, converts the voltage applied from the battery of the vehicle to a voltage of a predetermined level to supply power to the overall control means 300 To supply.

And the magnetic field sensor 330 is a means for measuring the rotation angle of the worm wheel 150, the electric signal according to the change of the magnetic force generated in accordance with the rotation of the magnet 200 protruding in front of the center of the wheel wheel 150 Output

In addition, the memory 340 stores rotation data of the worm wheel, including rotation data of the worm wheel corresponding to an electric signal input from the AMR sensor 330 which is a magnetic field sensor, and maximum and minimum rotation data of the worm wheel, that is, rotation angle data. It is.

The microprocessor controls driving of the motor 110 according to the wiper driving command input through the interface 310 and controls the motor 110 to forward and reverse rotation according to the rotation state of the worm wheel 150.

That is, in the embodiment of the present invention, the microprocessor 350 controls the driving of the motor 110 according to the wiper driving command input through the interface 310, but the microprocessor 350 controls the electric signal input from the magnetic field sensor 330. When the rotation data of the worm wheel according to the maximum or minimum rotation data of the worm wheel stored in the memory 340, and outputs a motor drive control signal to the motor drive drive 360 so that the rotation direction of the worm wheel 150 is reversed.

In addition, the motor driving drive 360 controls to change the polarity of the supply power applied to the brushes B1 and B2 through the switching unit 370 according to the motor driving control signal of the microprocessor 350. In addition, the motor drive drive 360 is the amount of current supplied to the motor 110 so that the rotational force of the motor corresponding to the wiping speed mode, for example, the low speed mode or the high speed mode of the wiper input through the interface 310. Is controlled by pulse width modulation.

The switching unit 370 changes and sets the power supply path supplied from the battery to the motor 110 according to the driving of the motor driving drive 360.

Hereinafter, a driving method of the vehicle front wiper drive device configured as described above will be described in more detail with reference to FIGS. 1 to 3.

First, when the user pulls the wiper lever, a wiper driving command according to a user's operation is input from the body control module of the vehicle through the interface 310 (S100).

In an embodiment of the present invention, the interface 310 that connects to the vehicle body control module is a local interconnect network (LIN) interface, which is a vehicle network technology, which provides low cost, serial communications for distributed electronic systems in a vehicle. System. This is designed to complement an existing auto multiplexing network, such as CAN, and will not be described in detail because it is a vehicle network technology already known before the filing date.

When the driving command is input through the interface 100 as described above, the microprocessor 350 of the wiper driving device is in contact with the commutator 121 of the motor so that a positive power is applied to the motor 110 of the wiper driving device. The motor is driven by setting a supply path of battery power applied to the brush 410 in the forward direction (S200).

That is, when the wiper drive command is input, the microprocessor 350 outputs a motor forward drive signal so that the motor rotates forward. Accordingly, the motor driving drive 360 turns on S1 and S4 of the switching unit 370 to set the supply path of the battery power in the forward direction so that + polarity power is applied to the brush B1 and −polar power is applied to the brush B2. . At this time, S2 and S3 exist in the off state.

The + power and-power of the battery is applied to each of the brushes B1 and B2, so that the motor 110 is driven in the forward rotation, and the worm wheel 150 is rotated in the forward direction through the rotation of the worm gear 130. The driving rotary shaft 140 is rotated in the forward direction. At this time, the magnet provided in front of the worm wheel is also rotated to change the magnetic force.

On the other hand, according to the auxiliary embodiment of the present invention, the step S200 is the rotation of the motor shaft by pulse width modulating the amount of current supplied to the commutator through the brush in accordance with the wiping speed mode included in the wiper driving command Controlling the speed.

That is, the microprocessor 350 is supplied to the motor 110 so that the rotational force of the motor corresponds to the wiping speed mode included in the wiper driving command input through the interface 310, for example, the low speed mode or the high speed mode of the wiper. The amount of current of the power supply to be controlled is controlled by pulse width modulation.

Then, when the motor 110 is driven by the drive as described above, receives the electrical signal corresponding to the rotation amount of the worm wheel from the magnetic field sensor 330 (S300).

That is, in the wiper driving method according to the present invention, as described above, the amount of rotation of the worm wheel detects and recognizes a change in the magnetic force of the magnet provided at the front of the worm wheel. It is configured to detect through.

In the embodiment of the present invention, an anisotropic magneto-resistance (AMR) sensor is adopted as the magnetic field sensor 330 for measuring the change in magnetic force as described above. The AMR sensor 330 is a type of magnetoresistive sensor that uses a principle in which resistance is changed by an external magnetic field in a ferromagnetic material. In general, the sensor is a thin film made of an alloy of NiFe, and is formed on a silicon wafer. Since the technology is known before the filing date of the present application, a detailed description of the sensing principle and configuration of the sensor will be omitted.

On the other hand, when the electric signal according to the magnetic force change according to the rotational position of the magnet provided in the center of the worm wheel from the magnetic field sensor 330 as described above, the microprocessor 350 is input with reference to the data table stored in the memory 340 The rotation angle data corresponding to the electrical signal is read (S400).

When the read rotation angle data coincides with the maximum and minimum rotation angle data of the worm wheel preset in the memory 340, the battery path supply path applied to the brush 410 so that the rotation direction of the worm wheel 150 is reversed. Change to the reverse direction to drive the motor 110 inverted (S500).

That is, when the rotation angle data of the worm wheel read out according to the electrical signal input from the magnetic field sensor 330 reaches the maximum rotation angle data stored in the memory, that is, the maximum rotation position, the microprocessor 350 rotates. The motor reverse rotation control signal is output to the motor driving drive 360 to reverse the direction. As such, the maximum position and minimum position information of the worm wheel inverting the rotational driving of the worm wheel serves as a kind of turning-point for the worm wheel.

Accordingly, the motor drive drive 360 has a power supply and a brush to the brush 410 B1 in which S2 and S3 are turned on and S1 and S4 are turned off and in contact with the commutator provided in the motor rotation shaft according to the motor reverse rotation control signal. 410, the + power is supplied to B2 to rotate in the opposite direction to the direction in which the motor 110 is rotated so that the wiper makes one wiping.

On the other hand, if the wiper end command is input through the interface 310 while the wiper is wiping once by the driving of the motor 110 as described above, after the wiping is performed once, the motor () stops and ends.

However, if no wiper end command is input from the body control module of the vehicle, the wiper driving method according to the present invention will rotate the motor 110 forward and backward to wipe the wiper until this command is input.

That is, if the wiper end command is not input, the microprocessor 350 enters the step S300 again to repeat the step S300 and subsequent steps.

In other words, when the rotation direction of the motor 110 is driven in a direction opposite to the initial rotation direction by the step S500, and the worm wheel 150 is reversely rotated, the microprocessor 350 may input electricity through the magnetic field sensor 330. The rotation angle data corresponding to the signal is read. When the rotation angle data read out reaches the minimum rotation data of the worm wheel, that is, the minimum rotation position, which is pre-stored in the memory 340, the motor driving drive 360 may reverse the rotation direction of the worm wheel 150 rotated in the reverse direction. ) To output the motor reverse rotation control signal.

Accordingly, the motor drive drive 360 turns on S1 and S4 of the switching unit, turns off S2 and S3, and + power is applied to the brush 410 B1 in contact with the commutator provided in the motor rotation shaft, and to the brush 410 B2. The worm wheel is rotated in the forward direction by changing the supply path of the battery power so that the power is supplied, thereby rotating the motor 110 in the opposite direction, that is, in the forward direction.

On the other hand, according to an additional embodiment of the present invention, the vehicle front wiper driving method according to the present invention comprises the steps of calculating the angular velocity data of the worm wheel using the read rotation angle data, and the motor rotation axis by referring to the calculated angular velocity data of the worm wheel And controlling the rotation speed of the motor shaft by pulse width modulating the amount of current supplied to the commutator through the brush to control the rotation speed of the motor.

According to this configuration, the method for driving the front wiper according to the present invention controls the rotation angle of the worm wheel, that is, the rotation speed of the motor rotational axis with respect to the rotational position through the microprocessor 350, thereby allowing the rotational position of the wiper blade, for example, the wiper. It is possible to improve the quality of wiping of the wiper by allowing the motor to be driven at an optimum speed for the lowest or highest position of the blade or the middle position thereof.

As described in detail above, the vehicle front wiper driving method according to the present invention uses a motor according to the rotation amount of the worm wheel through a motor drive control means including a magnet and a magnetic field sensor and a microprocessor for processing an electrical signal input from the magnetic field sensor. As the rotation axis is rotated in the forward and reverse direction, the drive operation link constituting the link assembly mounted on the drive rotation shaft of the worm wheel is rotated to the left and right, so that the rotation range of the drive operation link is reduced to half of that of the conventional drive device. It can be minimized to half.

Also, by controlling the pulse width modulation of the amount of power applied to the motor according to the wiping speed mode of the wiper input through the interface, the wiping speed of the wiper in the wiping speed mode, for example, the high speed mode or the low speed mode, is controlled. It can be implemented uniformly according to the wiping speed mode.

And by calculating the angular velocity data according to the rotation of the worm wheel through the rotation angle data of the worm wheel to control the rotation angle of the worm wheel, that is, the rotational speed of the motor shaft relative to the rotation position, the rotation position of the wiper blade, for example, the lowest of the wiper blade Alternatively, the motor can be driven at an optimum speed for the highest position or the intermediate position, thereby improving the wiping quality of the wiper.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that many different and obvious modifications are possible without departing from the scope of the invention from this description. Therefore, the scope of the invention should be construed by the claims described to include many such variations.

Claims (3)

Receiving a wiper driving command according to a user's manipulation from a body control module of the vehicle; Driving a motor by setting a supply path of a battery power applied to a brush in contact with a commutator of the motor in a forward direction so that forward power is applied to a motor constituting a wiper drive according to the wiper driving command; Receiving an electric signal by detecting a change in magnetic force corresponding to an amount of rotation of a magnet provided at a center of a worm wheel which is rotated by a rotation of a worm gear formed on a motor rotation shaft from a magnetic field sensor when the motor is driven; Reading rotation angle data corresponding to the input electrical signal; Inverting and driving the motor by changing a supply path of the battery power applied to the brush in a reverse direction so that the rotation direction of the worm wheel is reversed when the read rotation angle data coincides with the preset maximum and minimum rotation angle data of the worm wheel; Vehicle front wiper driving method comprising a. The method of claim 1, wherein driving the motor comprises: And controlling the rotational speed of the motor shaft by pulse width modulating the amount of power supplied to the commutator through the brush in accordance with the wiping speed mode included in the wiper driving command. . delete

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