KR20160069645A - Device for controlling wiper driving speed and method for the same - Google Patents

Abstract

The present invention provides a wiper variable speed control apparatus and method for configuring the wiper blade so as to be able to stay in the front view area of the windshield glass for as short a time as possible by controlling the speed of the wiper blade in accordance with the position of the wiper blade. Further, the present invention provides a wiper variable speed control device and method capable of improving the durability of the wiper device by decelerating the wiper blade at the time when the direction of movement of the wiper blade is switched.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wiper control device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for controlling a variable speed of a wiper for removing water droplets from a windshield of an automobile.

Generally, a windshield glass of a vehicle is provided with a wiper system for wiping windshield glass to secure a field of view during rains or to remove dust and dirt accumulated in a windshield glass, When the motor is operated to wipe the surface of the windshield glass, the washer fluid is sprayed onto the windshield glass to smooth the movement of the wiper blade and clean the contaminants on the windshield glass.

3, the automotive wiper apparatus includes a motor unit 100 for generating power, a link unit 200 for transmitting power, and a wiper blade unit 300 for wiping windshield glass have.

At this time, the motor unit 100 is configured such that the wiper motor 110, which provides power for driving the wiper, is formed integrally with the gear case to reduce the motor speed.

In addition, in the motor unit, the operating speed of the wiper blades 330 and 340 can be controlled through the coil current control applied to the motor.

On the other hand, in a windshield glass of a general vehicle, a pair of wiper blades are provided, and these wiper blades are interlocked with the motor portion through the link portion.

 The link unit 200 may include a main link that transmits the driving force of the motor unit and a driven link that transmits the driving force to the respective wiper blades. The link unit 200 is formed in various shapes to connect the motor unit and the wiper blade unit .

With this configuration, the wiper device moves along the surface of the windshield glass while the wiper blade moves, and an example of such movement path is shown in Fig.

As shown in Fig. 1, each wiper blade rotates counterclockwise from the bottom surface of the windshield glass. That is, the wiper blade on the driver's seat side is rotated about 90 degrees from the bottom of the windshield glass to be located near the side of the windshield glass, the wiper blade on the passenger's seat side is rotated about 90 degrees from the bottom of the windshield glass, And is generally parallel to the wiper blade on the driver's seat side.

In particular, the entire area in which the wiper blade has moved is the same as the areas S1 and S2 shown in FIG. 1, and there is a region that interferes with the front view of the driver's seat and the passenger seat in each of the areas.

In particular, in the case of an area obstructing the front view of the driver's seat, there is a fear of increasing the risk of an accident by covering the driver's field of view in case of rainy weather.

In this case, when the wiper blade rotates repeatedly, impact is rapidly accumulated in the link portion and the motor portion due to the high speed at the time when the direction is changed clockwise or counterclockwise as the wiper blade rotates repeatedly. And there was a risk of damage to the wiper device during long running.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a wiper device capable of sufficiently securing the visibility of a driver and a passenger in operation of the wiper device, Speed control apparatus and method.

In order to accomplish the above object, according to a preferred embodiment of the present invention, there is provided a wiper blade unit, A driving unit for driving the wiper blade of the wiper blade unit; And a control unit for controlling the wiper blade to rotate in response to the wiper operating signal, wherein the control unit variably controls the speed of the wiper blade according to the position of the wiper blade do.

The control unit divides the moving path of the wiper blade into two or more areas and controls the wiper blade to move at different speeds for each divided area according to the position of the wiper blade. Device.

Further, the driving unit may include a wiper variable speed control device.

The control unit receives the parking input voltage of the motor, estimates the position of the wiper blade from the change of the parking input voltage, and controls the wiper blade to move at a different speed depending on the position of the wiper blade. And a control device.

The controller determines the time required for the wiper to reciprocate once from the change of the parking input voltage in the estimation of the position of the wiper blade, and determines the total rotation angle of the wiper blade to be a predetermined time And estimates the position of the wiper blade in accordance with the time from the calculated rotational angular velocity.

The control unit may previously store data on the front view obstruction area according to the rotation of the wiper blade and control the speed of the wiper blade to increase when the position of the wiper blade is located in the front view obstruction area And a wiper control device.

In addition, the front view interference region is set to be positioned at the center of the movement path of the wiper blade. In the control unit, as the wiper blade moves out of the front view obstruction region and is directed to the direction switching point of the wiper blade, And controls the speed of the blade to gradually decelerate.

The wiper control apparatus may further include a transfer unit for transferring driving force from the driving unit to the wiper blade unit.

According to another aspect of the present invention, there is provided a method for controlling a wiper, Operating the wiper blade according to an operation signal of the wiper; Estimating a position of the wiper blade; And variably controlling the speed of the wiper blade according to an estimated position of the wiper blade.

Further, in the step of variably controlling the speed of the wiper blade, the moving path of the wiper blade is divided into two or more areas, and the wiper blade is controlled to move at different speeds according to the positions of the wiper blades And a wiper variable speed control method.

The wiper blade is driven by a motor. In the step of estimating the position of the wiper blade, the wiper blade receives the parking input voltage of the motor and estimates the position of the wiper blade from a change in the parking input voltage And a wiper variable speed control method.

Further, it is preferable that, prior to the step of estimating the position of the wiper blade, the time required for the wiper to reciprocate once from the change in the parking input voltage is determined, and the total rotation angle at which the wiper blade moves is set to a predetermined time And estimating a position of the wiper blade according to time from the estimated rotational angular velocity after calculating the required time and rotational angular velocity. .

In addition, in the step of previously storing data on the front view obstruction area due to the rotation of the wiper blade and varying the speed of the wiper blade, when the position of the wiper blade is located in the front view obstruction area, And controlling the speed of the wiper blade to increase so as to increase the speed of the wiper blade.

In the step of controlling the speed of the wiper blade, the wiper blade is moved out of the front view obstruction area and the wiper blade is moved in the forward direction of the wiper blade, And controlling the wiper blade to gradually decelerate the speed of the wiper blade toward the direction switching point.

Further, in the step of variably controlling the speed of the wiper blade, the speed of the wiper blade is varied by PWM-controlling the motor according to the position of the wiper blade.

Further, the present invention includes a wiper variable speed control method in which a calculated value of a time required for one-time reciprocating driving of a wiping blade calculated based on a comparison is compared with a measured value of an actual required time, and feedback control according to the error is performed .

According to another embodiment of the present invention, there is provided a method of operating a wiper, Operating the wiper blade according to an operation signal of the wiper; Determining a cycle in which the wiper blade returns to the home position by one rotation; Dividing an area by time according to the determined driving cycle and predetermined angle information; And controlling the speed of the wiper blade to be different for each of the divided regions.

The apparatus and method for controlling variable speed of wiper according to the preferred embodiment of the present invention can control the speed of the wiper blade in accordance with the position of the wiper blade so as to minimize the visibility disturbance area of the wiper blade and sufficiently ensure the visibility of the driver and the passenger There is an effect that can be.

In addition, according to a preferred embodiment of the present invention, impact applied when changing the direction of the wiper blade can be minimized, and the durability of the wiper device can be improved.

Fig. 1 conceptually shows a schematic configuration of a general wiper device and a view obstruction area in a driver's seat and a passenger's seat.
2 shows a schematic configuration of a wiper variable speed control apparatus according to the present invention,
FIG. 3 conceptually illustrates operation of a wiper parking switch having an auto stop function included in the wiper variable speed control apparatus according to the present invention,
4 is a graph showing input voltage variation due to parking of the wiper,
5 and 6 are graphs showing the positional relationship of the wiper blade according to the time of the wiper apparatus showing the input voltage variation as shown in FIG. 4,
7 and 8 are flowcharts schematically illustrating a wiper variable speed control method according to a preferred embodiment of the present invention.

The present invention is characterized in that the speed of the wiper blade is variably controlled according to the position of the wiper blade so that the wiper blade can stay in the front view area of the windshield glass for as short a time as possible.

Further, according to the present invention, the durability of the wiper device is improved by decelerating the wiper blade at the time when the moving direction of the wiper blade is switched.

In the preferred embodiment of the present invention, the wiper device includes a pair of wiper blades. However, the claims of the present invention should be construed to include all cases where the number of wiper blades is increased or decreased. .

That is, only the movement locus of the wiper blade is set differently according to the number of wiper blades, and two or more regions are divided along the set locus of movement. In order to sufficiently secure the visibility of the occupant, The same purpose can be achieved by applying the moving speed.

In addition, the preferred embodiment of the present invention is based on a structure that rotates the wiper blade using a motor and a link structure, but the claims of the present invention should not be construed to be limited only to these configurations, But should be interpreted to include various forms of embodiments that can provide significantly different pivoting rates.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a wiper variable speed control apparatus and method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 shows a schematic configuration of a wiper variable speed control device according to the present invention.

2, in the wiper variable speed control apparatus according to the preferred embodiment of the present invention, a wiper blade unit 300, a driving unit 100 for driving the wiper blade of the wiper blade unit 300, And a control unit 400 for operating the driving unit 100 to control the driving of the wiper blade.

And an input unit 500 for transmitting a wiper operation signal for driving the wiper device. The input unit 500 may be configured to generate an input for operating the wiper by a driver, and may preferably be a multifunction switch mounted under the steering wheel of the vehicle.

The wiper blade unit 300 and the driving unit 100 for providing a driving force for the wiper blade unit 300 can be connected to each other through a drive transmission unit 200 having a plurality of links. ) Can be used without limitation as long as the configuration can vary the speed of the vehicle.

Since the specific structure of such a wiper device is a well-known structure, a detailed description thereof will be omitted in this specification.

The driving unit 100 may be configured to provide a driving force to the wiper blades 310 and 320. The driving unit 100 may be configured to include a motor. The driving unit 100 performs PWM control of the input current applied to the wiper blades 310 and 320, So that the rotation speed can be adjusted.

As shown in FIG. 2, the wiper blade unit 300 may include a pair of wiper blades 310 and 320. In this case, the area of the driver's seat and the passenger's seat may be defined by the wiper blades 310 and 320 As shown in FIG.

The control unit 400 receives a wiper operation signal from the input unit 500 and controls the wiper blades 310 and 320 to rotate. At this time, the controller 400 variably controls the speed of the wiper blades 310 and 320 according to the positions of the wiper blades 310 and 320.

In more detail, the wiper variable speed control device according to the preferred embodiment of the present invention includes a wiper parking switch 600 having an auto stop function. Based on the variation of the parking input voltage of the wiper parking switch 600, the wiper blade 310 , And 320, and controls the speeds to be different according to the positions.

For example, the control unit 400 divides the movement path of the wiper blade 310 and 320 into two or more regions, and moves the wiper blade 310 and the wiper blade 320 at different speeds according to the positions of the wiper blades 310 and 320, And controls the blades 310 and 320 to move.

1, the entire moving regions S1 and S2 of the wiper blades 310 and 320 are divided into a front view interference region which obstructs the front view of the driver's seat and the other regions, The driving unit 100 may be controlled to have a different wiper blade moving speed.

In this regard, FIG. 3 conceptually shows the operation of the wiper parking switch 600 having the auto stop function included in the wiper variable speed control apparatus according to the present invention, and FIG. 4 conceptually shows the input voltage change FIG.

Referring to FIG. 3, the wiper parking switch 600 includes a stop contact 620 at which the operation of the wiper blade is stopped, and a divided contact that forms the movable contact 630 at which the wiper blade is driven. At this time, the stop contact 620 is connected to the ground side, and the movable contact 630 is connected to the power source side.

3 (a) and 3 (b), the portion indicated by the dotted line of the switch 610 indicates the initial position of the switch 610 in each state, and the solid line indicates that the switch 610 is moved in each state .

3 (a) shows a state in which the wiper blade is not operated during the initial wiper driving, and Fig. 3 (b) shows a state in which the wiper is switched from the driving state to the stopped state it means.

3 (a), at the initial position of the switch 610 as indicated by the dotted line, the switch is connected to the stop contact 620 connected to the ground side, and therefore the wiper does not operate.

Meanwhile, as the switch 610 rotates clockwise at the stop contact 620, the switch 610 is moved to the movable contact 630 side, and the wiper is operated while power is supplied to the motor side.

3 (b), the switch 610 is rotated in the clockwise direction along the movable contact 630, the power supply is stopped to the motor side while the solid line portion is moved to the stop contact 620 side do.

Accordingly, the wiper parking switch 600 having the auto stop function driven in this way is operated when the switch of the wiper blade is located on the stop contact 620 and when the switch is located on the movable contact 630, Which is shown in FIG.

4 shows a change in the parking input voltage when the vehicle having the 12V power source drives the wiper device at a low speed.

4, the region where the voltage is detected to be close to 0V is the case where the switch 610 is located on the stop contact 620, and the region which is detected as a value close to 12V is the region where the switch 610 is connected to the movable contact 630 ). ≪ / RTI >

Hereinafter, the position estimation and speed control of the wiper blade will be described with reference to Figs. 4 to 6. Fig.

According to a preferred embodiment of the present invention, in estimating the position of the wiper blade, the controller 400 determines a time required for the wiper to reciprocate once from the change in the parking input voltage, Is calculated by dividing the total rotation angle by the predetermined required time.

The calculated angular velocity of rotation is used to estimate the position of the wiper blade over time.

In the wiper parking switch 600 as shown in FIG. 3, when the switch 610 makes one rotation, the wiper blade returns to its original position again.

Therefore, from the first low-voltage point to the second low-voltage point of time of the parking input voltage in the graph of FIG. 4, it means the time required to drive the wiper once.

That is, in the example of FIG. 4, the time required for the wiper to drive once, that is, the operation cycle of the wiper is set to 20 seconds.

5 and 6 are graphs showing the positional relationship of the wiper blade according to time in the wiper apparatus showing the input voltage variation as shown in FIG.

5 and 6 illustrate the position of the wiper blade in terms of time, assuming that the wiper moves at a constant speed when moving.

That is, when the initial point of the wiper blade is assumed to be 0, the final point, that is, the maximum value when the wiper blade rotates maximum, has an angle of maximum value. At the end point, the wiper blade returns.

Since the moving speed of the wiper blade is a constant speed, it is possible to estimate the position of the wiper in a linear shape with respect to time as shown in FIG.

5, the maximum angle at which the wiper blade moves is divided into five, the 1/5 point is set as the lower limit of the front view interference area, and the 4/5 point is set as the upper limit of the front view interference area. Therefore, in a preferred embodiment of the present invention, the wiper blade rotation speed at the 0 to 1/5 point and the 4/5 point to 5/5 point is changed from the 1/5 point to the 4/5 point As shown in Fig.

Preferably, when the estimated position of the wiper is located between the 1/5 point and the 4/5 point, the wiper blade is present on the front view obstruction area and controls the wiper blade to move at the maximum speed, It is controlled to move at a relatively slow speed because there is little possibility of disturbing the forward view.

Further, since the front view interference region is usually set so as to be positioned at the center of the movement path of the wiper blade where the eyes of the driver or the passenger are located, it is more preferable that the wiper blade moves out of the front view interference region The wiper blade can be controlled to gradually decelerate the speed of the wiper blade toward the direction switching point of the wiper blade.

In this case, the durability of the wiper device can be greatly improved since the wiper blade can slow down the rotation speed as much as possible before switching the direction.

In addition, the controller may be configured to previously store data on the front view obstruction area, and the driver may change the data if necessary.

On the other hand, the data for each point can be expressed in terms of time, as in Fig.

That is, the wiper blade rotating at an isometric speed is located at 0.2 to 1/5 point, located at 0.8 to 4/5 point, then again at 1.2 to 4/5 point, and 1.8 to 1 / .

Thus, according to this embodiment, the wiper is moved at a relatively high speed in the 0.2 second to 0.8 second interval, and the wiper is moved at the relatively slow speed in the 0 to 0.2 second, 0.8 to 1.2 second, and 1.8 to 2 second intervals .

The speed of the wiper blade can be controlled by PWM control of the motor through the control unit. In this case, the duty ratio of the voltage applied to each section is varied to control the rotation speed.

In addition, since the characteristics of the motor can be changed according to environment variables such as temperature, the voltage of the wiper parking switch 600 can be continuously monitored to perform feedback control for correcting the required time and position estimation model. In addition, it is also possible to detect the time required for the actual wiper blade to rotate together with the monitoring of the voltage of the wiper parking switch 600, and to feedback-control the error generated according to the comparison result.

Meanwhile, FIG. 7 schematically shows a flowchart of a method for variably controlling the speed of the wiper using the wiper variable speed control device as described above.

Referring to FIG. 7, in a preferred embodiment of the present invention, an operation signal of a wiper is inputted (S100), a wiper blade is operated according to an operation signal of a wiper, and a position of the wiper blade is estimated (S120) The variable speed of the wiper blade is controlled (S130).

According to a preferred embodiment of the present invention, in the variable control of the speed of the wiper blade, the movement path of the wiper blade is divided into two or more regions, and the wiper blade is divided into two or more regions, And controls the wiper blade to move.

In particular, in a preferred embodiment of the present invention, as described above, the wiper blade is configured to be driven by a motor.

Therefore, in the step of estimating the position of the wiper blade (S120), the controller receives the parking input voltage of the motor and estimates the position of the wiper blade from the change of the parking input voltage.

Preferably, the step of estimating the position of the wiper blade may further include calculating a wiper required time and an operation speed (S110) as shown in FIG.

Accordingly, in a preferred embodiment of the present invention, the time required for the wiper to reciprocate once from the variation of the parking input voltage is determined before the step of estimating the position of the wiper blade (S120) (S110), which is obtained by dividing the total rotation angle by the predetermined required time.

Accordingly, if the required time and angular velocity are calculated through the above steps, the position of the wiper blade can be estimated from the calculated angular velocity of rotation (S120), thereby determining whether or not the wiper blade is positioned within the front- . Therefore, different control is possible for each divided section.

As described above, both the position of the wiper blade and the front view obstruction area can be converted into time, and the step of estimating the position of the wiper blade and judging whether or not the wiper blade exists in the front view disturbance area, Is substantially the same as controlling the time according to whether or not it exists within the estimated time interval according to the section of the front view obstruction area.

That is, in the example of FIGS. 4 to 6, if the driving period of the wiper is determined to be 2 seconds, the interval of 0.2 to 0.8 seconds is set to the region where the wiper blade rotates at high speed, and the range of 0 to 0.2 seconds, 0.8 to 1.2 seconds, And, the interval of 1.8 to 2 seconds is set as an area in which the wiper blade rotates at low speed, and it is possible to control by checking the time after the initial point.

8, when the operation signal of the wiper is input (S200), the time required for one-time driving of the wiper blade, that is, the driving period is determined (S210) According to the angle information (angle information about the front view obstruction area), the operation area is divided by time (S220). As shown in the graphs of FIGS. 5 and 6, the area dividing step S220 divides the forward view interference region, that is, the high-speed driving region and the other region, that is, the low-speed driving region, .

If the area is divided by time, the driving speed of the wiper blade is variably controlled according to the area to which the current time belongs (S230).

Meanwhile, as shown in FIGS. 7 and 8, the speed of the wiper blade can be changed by PWM control of the motor according to the position of the wiper blade (S130, S230).

In addition, as described above, the calculated value of the time required for one reciprocating drive of the wiper blade calculated as described above is compared with the measured value of the actual required time, and the feedback control according to the error is performed (S140, S240) Can be added.

On the other hand, it is checked whether there is an input for terminating the driving of the wiper in the input unit (S150, S250), and the driving may be terminated or the above steps may be repeated.

While the present invention has been described with reference to the preferred embodiments, those skilled in the art will appreciate that modifications and variations are possible in the elements of the invention without departing from the scope of the invention. In addition, many modifications may be made to the particular situation or material within the scope of the invention, without departing from the essential scope thereof. Therefore, the present invention is not limited to the detailed description of the preferred embodiments of the present invention, but includes all embodiments within the scope of the appended claims.

100:
200:
300: wiper blade portion
310, 320: Wiper blade
400:
500: input unit
600: Wiper Parking Switch
610: Switch
620: Stop contact
630: movable contact

Claims (17)

A wiper blade portion;
A driving unit for driving the wiper blade of the wiper blade unit;
And a control unit for receiving the wiper operating signal and controlling the wiper blade to rotate,
Wherein the control unit variably controls the speed of the wiper blade according to the position of the wiper blade.
The method according to claim 1,
Wherein the control unit divides the movement path of the wiper blade into two or more regions and controls the wiper blade to move at different speeds according to the positions of the wiper blades in the divided regions.
The method according to claim 1,
Wherein the driving unit is a motor.
The method of claim 3,
Wherein the control unit receives the parking input voltage of the motor, estimates the position of the wiper blade from the change of the parking input voltage, and controls the wiper blade to move at a different speed depending on the position of the wiper blade. .
The method of claim 4,
Wherein the control unit determines a time required for the wiper to reciprocate once from the change of the parking input voltage and estimates the time required for the wiper to reciprocate by rotating the entire rotating angle of the wiper blade And estimates the position of the wiper blade with respect to time from the estimated rotational angular velocity.
The method according to claim 1 or 5,
Wherein the controller is configured to store data on the front view obstruction area according to the rotation of the wiper blade and to control the speed of the wiper blade to increase when the position of the wiper blade is located in the front view obstruction area Wherein the wiper control device is a wiper control device.
The method of claim 6,
The front view obstruction area is set to be positioned at the center of the movement path of the wiper blade,
Wherein the controller controls the wiper blade to gradually decrease the speed of the wiper blade as the wiper blade moves away from the front view obstruction area to a direction switching point of the wiper blade.
The method according to claim 1,
Further comprising a transfer unit for transferring a driving force from the driving unit to the wiper blade unit.
Receiving an operation signal of the wiper;
Operating the wiper blade according to an operation signal of the wiper;
Estimating a position of the wiper blade;
Varying the speed of the wiper blade according to an estimated position of the wiper blade;
Wherein the wiper control device is configured to control the wiper control device.
The method of claim 9,
In the step of variably controlling the speed of the wiper blade, the movement path of the wiper blade is divided into two or more regions and the wiper blade is controlled to move at different speeds according to the positions of the wiper blades according to the positions of the wiper blades Characterized in that the wiper variable speed control method.
The method of claim 9,
The wiper blade is driven by a motor,
Wherein the step of estimating the position of the wiper blade is configured to receive the parking input voltage of the motor and estimate the position of the wiper blade from the change of the parking input voltage.
The method of claim 11,
Wherein the wiper blade is driven by a driving motor and the wiper blade is driven by a driving motor and the wiper blade is driven by a motor, Further comprising the step of estimating an angular velocity,
And estimating the position of the wiper blade with respect to time from the estimated rotational angular velocity after calculating the required time and rotational angular velocity.
The method according to claim 9 or 12,
Data on the front view obstruction area according to the rotation of the wiper blade is stored in advance,
Wherein the step of controlling the speed of the wiper blade is controlled such that the speed of the wiper blade increases when the position of the wiper blade is located in the front view obstruction area.
14. The method of claim 13,
The front view obstruction area is set to be positioned at the center of the movement path of the wiper blade,
And controlling the speed of the wiper blade to be gradually reduced as the wiper blade is moved out of the front view obstruction area toward the direction switching point of the wiper blade, A variable speed control method for a wiper.
The method of claim 11,
Wherein the step of varying the speed of the wiper blade varies the speed of the wiper blade by PWM control of the motor according to the position of the wiper blade.
The method of claim 12,
Wherein the calculated value of the time required for one reciprocating drive of the wiping blade calculated is compared with the measured value of the actual required time, and the feedback control according to the error is performed.
Receiving an operation signal of the wiper;
Operating the wiper blade according to an operation signal of the wiper;
Determining a cycle in which the wiper blade returns to the home position by one rotation;
Dividing an area by time according to the determined driving cycle and predetermined angle information;
Controlling the speed of the wiper blade to be different from each other in the divided areas;
Wherein the wiper control device is configured to control the wiper control device.

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