KR20090020913A - Rain sensing system for a vehicle and control method thereof - Google Patents

Abstract

A rain sensing system for a vehicle is provided, which secures vision of a driver by automatically driving a wiper by detecting the rain if it rains. A rain sensing system for a vehicle comprises: piezoelectric sensors(10,20) which can sense whether it rains or not by using the pressure applied to the vehicles; a controller(30) outputting the control signal removing the rain on the vehicle front glass according to the sensed value; a wiper motor(40) which is driven according to the output of controller in order to remove the rain of the vehicles front glass; and a current sensor(35) sensing the current inputted to the wiper motor and reading the frictional force between the wiper and the front glass.

Description

Rain sensing system for a vehicle and control method

The present invention relates to a vehicle non-sensing system and control method, the vehicle non-sensing system and control method that can detect the foreign matter and rain hit the windshield of the vehicle, and can automatically control the driving speed of the wiper according to the intensity of the rain It is about.

In general, the rain detection system for a vehicle is equipped with a sensor inside the wind shield (Wind Shield) that is the windshield of the vehicle, to determine the presence or absence of rain by using infrared rays, so that the wiper can be driven without the user's operation.

To this end, a sensor is attached to the vehicle inner surface of the windshield, and is provided with a transmission and reception unit capable of transmitting and receiving infrared rays.

In addition, the method of detecting rain determines that the rain occurs on the windshield of the vehicle when the rain on the windshield of the vehicle drops the total reflection condition of the infrared light. This is because an excessive loss occurs and the receiver receives less light than the amount of light transmitted from the transmitter, and the controller calculates a difference between the transmitted light and the received light.

In addition, the method of detecting the intensity of the rain may detect the intensity of the rain according to the light quantity difference between the transmitted light and the received light. For example, the light intensity difference between the transmitted light transmitted from the transmitter and the received light detected by the receiver is small. It is determined that the intensity of the rain is weak, the speed of the wiper motor is reduced, and the greater the light quantity difference, the stronger the rain, and the speed of the wiper motor is increased.

However, the infrared transmitting and receiving unit was provided in the operating section of the wiper to act as an obstructive element of the driver's view, and thus, there was a problem that it is likely to lead to an accident, deteriorating safety and damaging the appearance.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a non-sensing system and control method for a vehicle that automatically detects rain and drives the wiper automatically, while not obstructing the driver's view.

Another object of the present invention is to provide a non-sensing system and a control method for a vehicle that can increase the predictive accuracy of non-occurrence and thus the responsiveness such as wiper driving, thereby increasing safety by eliminating unnecessary manipulation of the driver. The purpose.

Another object of the present invention is to provide a non-sensing system and a control method for a vehicle that can maximize the driver's field of view without a separate additional configuration on the front of the vehicle by using a current sensing unit for sensing the current of the wiper motor. .

The problem solving means of the present invention by estimating the friction force between the windshield and the wiper through the drive current of the wiper motor, without additional configuration, by detecting the presence, absence, and the intensity of the rain to determine whether the drive of the wiper motor and speed To control.

Another problem solving means of the present invention detects the presence or absence of rain by using a pressure difference between the piezoelectric sensor attached to the spacer member inside the vehicle, and the piezoelectric sensor mounted on the vehicle inner surface, and provided with a sound absorbing member outside the vehicle A piezoelectric sensor is used to detect the intensity of the rain to control whether the wiper motor is running and the speed.

Another problem solving means of the present invention is to control the driving of the wiper motor by detecting the presence or absence of rain with a piezoelectric sensor attached to the inside and outside of the vehicle, by estimating the friction force between the windshield and the wiper through the drive current of the wiper motor The speed of the wiper motor is controlled by detecting the intensity of the rain.

As described above, the present invention having the configuration as described above may automatically detect the non-sensing and thus drive the wiper without additional configuration so as not to obstruct the driver's view on the windshield of the vehicle, or use a piezoelectric sensor. By detecting the presence or absence of rain and the intensity of rain, you can control whether the wiper is driven and driving speed, or increase the accuracy and response speed in detecting rain by using the piezoelectric sensor and the wiper current sensing simultaneously. This can increase the quality and so on.

In order to achieve the above object, the present invention is a piezoelectric sensor that can be attached to the outside of the front glass of the vehicle to detect the presence or absence of rain by the pressure applied to the vehicle; A control unit for outputting a control signal for driving to remove the ratio of the windshield of the vehicle according to the value detected by the piezoelectric sensor; A wiper motor driven to remove a ratio of the vehicle windshield according to the output of the controller; It includes.

The non-sensing system for a vehicle may include a current sensing unit configured to sense a current input to the wiper motor in order to detect a friction force between the wiper motor and the windshield; It characterized in that it further comprises.

The controller may reduce the driving speed of the wiper motor when the driving current of the wiper motor exceeds a preset reference value by using the sensed current value of the current sensing unit, and the driving current of the wiper motor may be a preset reference value. It is characterized by increasing the drive speed of the wiper motor below.

In addition, the vehicle rain detection system includes a first piezoelectric sensor provided inside the vehicle windshield for detecting the presence or absence of rain; A second piezoelectric sensor provided inside the front glass and spaced apart from the front glass by a spacer; It characterized in that it further comprises.

In this case, the controller may determine whether the rain is present or not by using a difference between the detected values of the first piezoelectric sensor and the second piezoelectric sensor.

The piezoelectric sensor may further include a sound absorbing member that absorbs sound; It characterized in that it further comprises.

On the other hand, the first step of the control unit detects the current flowing to the wiper motor for driving the wiper for removing the foreign matter from the vehicle windshield; A second step of determining, by the controller, whether a current flowing to the wiper motor exceeds a preset reference value; When the control unit exceeds the reference value, it is determined that the amount of rainfall is small, so that the frictional force between the wiper motor and the front windshield is large and the wiper motor speed is decreased. When the reference value is less than the reference value, the wiper motor and the windshield are large. A third step of determining that the frictional force is low and increasing the wiper motor speed; It includes.

And, the first step of determining the presence or absence of rain using the pressure applied to the vehicle by the piezoelectric sensor provided on the outside of the vehicle windshield; A second step of transmitting the intensity of the rain to the controller when the piezoelectric sensor senses the rain; The control unit drives a wiper motor according to the detected value of the piezoelectric sensor; It includes.

In addition, a first step of transmitting the detection value to the control unit in the first piezoelectric sensor provided on the inside of the vehicle windshield and the second piezoelectric sensor provided at a predetermined interval away from the windshield; A second step of comparing, by the controller, detection values of the first piezoelectric sensor and the second piezoelectric sensor and determining that the rain is detected when the preset value is exceeded; A third step of determining, by the controller, a rainfall according to detection values of the first piezoelectric sensor and the second piezoelectric sensor, and controlling a speed of the wiper motor according to the rainfall; It includes.

In addition, the first step of determining the presence or absence of rain in the control unit using a piezoelectric sensor attached to the vehicle windshield; A second step of sensing a current flowing to the wiper motor when the rain is detected by the piezoelectric sensor; Determining, by the controller, whether the current flowing to the wiper motor exceeds a preset reference value; When the control unit exceeds the reference value, it is determined that the amount of rainfall is large and the frictional force between the wiper motor and the windshield is large, and the wiper motor speed is decreased. When the reference value is lower than the reference value, the wiper motor and the windshield Determining the frictional force of the fourth step and increasing the wiper motor speed; It includes.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a vehicle non-sensing system according to the present invention, and FIG. 2 is a flowchart schematically illustrating a method for controlling the vehicle non-sensing system of FIG. 1. As shown in the figure, the vehicle non-sensing system 1 according to the present invention comprises a control unit 30, the current sensing unit 35, the wiper motor 40 and the power supply unit 60.

First, a wiper is provided outside the front of the vehicle, and in the case of rain or foreign matter, it is made to be driven automatically or by a user, and the wiper motor 40 is driven for this purpose.

In addition, the wiper motor 40 receives power from the power supply unit 60, which is a battery. When the voltage applied to the wiper motor 40 by the user or automatically increases, the driving speed of the wiper increases. When the voltage applied to the wiper motor 40 is lowered, the drive speed of the wiper is reduced.

In addition, when the current flowing to the wiper motor 40 is high, a friction force is generated between the windshield of the vehicle and the wiper, so that the current is applied to the wiper motor 40 relatively high, and flowing to the wiper motor 40. When the current is low, since the friction force between the vehicle windshield and the wiper hardly occurs, the current is relatively low applied to the wiper motor 40.

That is, when the current flowing through the wiper motor 40 is high, the precipitation is high and the friction force between the vehicle windshield and the wiper is hardly generated. When the current flowing through the wiper motor 40 is low, the precipitation is low and the vehicle windshield is low. This is a case where friction force between wiper and wiper occurs relatively.

In other words, in the case of heavy rainfall, a lot of rain hits the windshield of the vehicle, which reduces the friction between the windshield of the vehicle and the wiper for wiping it off, thus increasing the speed of the wiper motor 40, Decreases and the amount of current decreases.

On the contrary, when the rainfall is relatively small, a small amount of rain hits the vehicle windshield, thereby increasing the frictional force between the vehicle windshield and the wiper wiping it, resulting in a low speed of the wiper motor 40. Even if the friction force increases, the amount of current increases.

Using this, the controller 30 includes a current sensing unit 35 for measuring a current flowing through the wiper motor 40, and the wiper motor 40 sensed by the current sensing unit 35. The rainfall is determined through the current, and the feedback signal is generated using the current to control the speed of the wiper motor 40.

For example, if the current value detected by the current detector 35 is less than or equal to the preset setting value, it is determined that rainfall is high, the speed of the wiper motor 40 is increased, and the current detector 35 detects the current value. When a current value is tested and exceeds a preset set value, it is determined that rainfall is small and the speed of the wiper motor 40 is reduced.

In addition, the controller 30 receives a sensed current value of the current detector 35, removes an error included in the current value, and filters / amplifiers 31 to amplify the current signal. And a comparator 33 to compare the current value with a previously stored set value.

Here, the set value is preferably set by a plurality of tests, and is a matter to be considered when designing the comparator 33 of the control unit 30. Although the comparator 33 is not used, a storage device such as a memory and It is also preferable to have a CPU, such as a microcontroller, to set the set value as a variable according to a plurality of situations, and to input and control a plurality of inputs to be flexibly applied.

In addition, in the present embodiment, in order to determine the presence or absence of rain, it is preferable to periodically drive the wiper within a range that does not obscure the user's field of view, or to determine the presence or absence of rain using a piezoelectric sensor or the like.

Hereinafter, a control method of a vehicle non-sensing system according to the present embodiment will be described.

First, when the wiper motor 40 is driven (S11), the current sensing unit 35 detects a driving current applied to the wiper motor 40 (S12).

In addition, the driving current of the wiper motor 40 sensed by the current sensing unit 35 is input to the control unit 30, and to remove data other than the current sensing value included in the driving current, a filter. The filter passes through the filter / amplifier 31 which amplifies the filtered current sensed value and moves to a comparator 33 in the controller 30 to be compared with a previously stored set value (S13).

In addition, the comparator 33 performs a step (S14) to ask whether the drive current is tested and exceeds a previously stored set value, and as a result, if the drive current exceeds the reference value, rainfall is relatively small. If so, the speed of the wiper motor 40 is reduced so that the wiper is driven relatively slowly (S15).

On the other hand, when the drive current is less than the reference value because the rainfall is relatively high, the speed of the wiper motor 40 is increased to drive the wiper relatively fast (S16).

In addition, when the wiper motor 40 is stopped, the step (S17) is executed. When the wiper motor 40 is driven, the rain is continuously falling, and thus the user does not stop the wiper. The wiper speed is continuously controlled, and when the wiper motor 40 is not driven, the rain does not come and the wiper is stopped by the user, thereby terminating the vehicle non-sensing system control method according to the present invention.

3 is a block diagram schematically illustrating a vehicle non-sensing system according to the present invention, and FIG. 4 is a flowchart schematically illustrating the method for controlling the vehicle non-sensing system of FIG. 3. As shown in the drawings, the vehicle non-sensing system 2 according to the present invention is the first piezoelectric sensor 10 and the second piezoelectric sensor 20, the spacer 21 and the control unit 30 mounted inside the vehicle. ), A wiper motor 40, a piezoelectric sensor 50 and a sound absorbing member 51 mounted outside the vehicle.

Here, there are three ways to determine the presence or absence of rain.

First, a method using each piezoelectric sensor 10, 20 inside the vehicle, a method using the piezoelectric sensor 50 outside the vehicle, and a method using both the piezoelectric sensors 10, 20, 50 inside the vehicle, Can be distinguished.

Here, the components according to the method using the respective piezoelectric sensors 10, 20 in the vehicle is the first piezoelectric sensor 10, the second piezoelectric sensor 20, the spacer 21, the control unit 30 and the wiper motor 40 is made.

The first piezoelectric sensor 10 attached to the inside of the windshield of the vehicle detects the pressure applied to the vehicle and transmits the pressure to the controller 30, and is spaced apart by the spacer 21 inside the windshield of the vehicle. The second piezoelectric sensor 20 also detects the pressure applied to the vehicle through the spacer 21 and transmits the pressure to the controller 30.

In this case, the reason why the spacer 21 is provided is to detect the presence or absence of rain. When the rain does not rain, the pressure applied to the first piezoelectric sensor 10 and the second piezoelectric sensor 20 may cause vibration of the vehicle. Since only the input due to the operation is similar, but when it rains because the first piezoelectric sensor 10 receives more pressure by the rain than the second piezoelectric sensor 20.

Accordingly, the second piezoelectric sensor 20 provides the reference pressure due to the spacer 21, and the first piezoelectric sensor 10 provides the controller 30 with the pressure increased or decreased depending on the presence or absence of rain. In addition, the difference between the reference pressure and the increased or decreased pressure can be used to determine the presence or absence of rain.

Thus, the controller 30 filters and amplifies an input value through a filter / amplifier 31 and compares the input value with a preset value stored in the comparator 32 to determine whether to drive the wiper motor 40. Done.

Here, the set value is preferably set by a plurality of tests, and is a matter to be considered when designing the comparator 33 of the control unit 30. Although the comparator 33 is not used, a storage device such as a memory and It is also preferable to have a CPU, such as a microcontroller, to set the set value as a variable according to a plurality of situations, and to input and control a plurality of inputs to be flexibly applied.

In addition, the driving speed of the wiper motor 40 is controlled according to the strength of the pressure applied to the first piezoelectric sensor 10. For example, a situation where the rain is increased as the pressure detected by the first piezoelectric sensor 10 increases. Therefore, since the speed of the wiper motor 40 is increased, and the smaller the pressure sensed by the first piezoelectric sensor 10 is, the less rain comes, the speed of the wiper motor 40 is reduced.

In addition, the component according to the method of using the piezoelectric sensor 50 outside the vehicle includes a piezoelectric sensor 50, a sound absorbing member 51 provided to surround it, the controller 30 and the wiper motor 40.

Here, the piezoelectric sensor 50 attached to the outside of the vehicle to detect the pressure applied to the vehicle is provided with a sound absorbing member 51 to eliminate the influence of the vibration of the vehicle itself, and the piezoelectric sensor 50 itself. Is provided to be directly exposed to the pressure of the rain.

First, the piezoelectric sensor 50 transmits the pressure applied to the vehicle to the controller 30, and the controller 30 filters and amplifies an input value through a filter / amplifier 31, and comparator In operation 32, it is determined whether the wiper motor 40 is driven by comparing with the preset value.

In addition, the driving speed of the wiper motor 40 is controlled according to the strength of the pressure applied to the piezoelectric sensor 50. For example, as the pressure detected by the piezoelectric sensor 50 increases, the wiper motor is in a situation where a lot of rain occurs. Since the speed of the 40 is increased, and the pressure detected by the piezoelectric sensor 50 is smaller, there is less rain, the speed of the wiper motor 40 is reduced.

Here, the set value is preferably set by a plurality of tests, and is a matter to be considered when designing the comparator 33 of the control unit 30. Although the comparator 33 is not used, a storage device such as a memory and It is also preferable to have a CPU, such as a microcontroller, to set the set value as a variable according to a plurality of situations, and to input and control a plurality of inputs to be flexibly applied.

In addition, a component according to a method of using both the piezoelectric sensors 10, 20, and 50 inside and outside the vehicle may include a first piezoelectric sensor 10, a second piezoelectric sensor 20, and a spacer 21 mounted inside the vehicle. ), The controller 30, the wiper motor 40, the piezoelectric sensor 50 and the sound absorbing member 51 mounted outside the vehicle.

Here, the first piezoelectric sensor 10 and the second piezoelectric sensor 20 is made to detect the presence or absence of rain in the above manner, the piezoelectric sensor 50 is preferably made to detect the intensity of the rain. Do.

The reason is that since the first piezoelectric sensor 10 is attached inside the vehicle, the intensity of the ratio may not be reflected according to the pressure absorbed by the vehicle windshield.

Hereinafter, a control method of a vehicle non-sensing system according to the present embodiment will be described.

First, each of the first pressure and the second pressure detected by the first piezoelectric sensor 10 and the second piezoelectric sensor 20 moves to the controller 30 (S21).

In addition, the controller 30 performs a step of filtering and amplifying each of the received signals and comparing the received signals with previously stored set values (S22).

On the other hand, the piezoelectric sensor 50 having a sound absorbing member 51 on the outside of the vehicle senses the pressure, and transmits the pressure of the rain detected by the piezoelectric sensor 50 to the controller 30 (S24), the transmission Filtering and amplifying each received signal, and compares it with a previously stored threshold value (S25).

When the comparison result of the step S22 and the step S25 exceeds the set value and the threshold value, since the rain is the case, the control unit 30 outputs a control signal to drive the wiper (S26).

In addition, the rainfall is determined according to the strength of the pressure detected by the first piezoelectric sensor 10 and the piezoelectric sensor 50 installed outside, thereby controlling the speed of the wiper motor 40 (S27), and the wiper motor. In operation S28, it is determined whether the 40 stops.

In this case, when the wiper motor 40 is driven, since the rain is continuously falling and the user does not stop the wiper, the process returns to the steps S21 and S23 to continuously control the wiper speed and the wiper motor 40. Since the wiper is stopped by the user because the rain does not come when it is not driven, the method for controlling the vehicle rain detection system for a vehicle according to the present invention ends.

5 is a block diagram schematically illustrating a vehicle non-sensing system according to the present invention, and FIG. 6 is a flowchart schematically illustrating a method for controlling the vehicle non-sensing system of FIG. 5. As shown in the drawings, the vehicle non-sensing system 3 according to the present invention is a vehicle non-sensing system 3 according to the present invention is the first piezoelectric sensor 10 and the second piezoelectric sensor ( 20, the separation member 21, the control unit 30, the wiper motor 40, the current sensing unit 35, the power supply unit 60, and the piezoelectric sensor 50 and the sound absorption member 51 mounted outside the vehicle. It is made to include.

Here, there are two ways to determine the presence or absence of rain.

First, the method may be divided into a method of using the piezoelectric sensors 10 and 20 inside the vehicle and a method of using the piezoelectric sensors 50 outside the vehicle.

Here, the components according to the method using the respective piezoelectric sensors 10, 20 in the vehicle is the first piezoelectric sensor 10, the second piezoelectric sensor 20, the spacer 21, the control unit 30 and the wiper motor 40, the current sensing unit 35, and the power supply unit 60 are included.

The first piezoelectric sensor 10 attached to the inside of the windshield of the vehicle detects the pressure applied to the vehicle and transmits the pressure to the controller 30, and is spaced apart by the spacer 21 inside the windshield of the vehicle. The second piezoelectric sensor 20 also detects the pressure applied to the vehicle through the spacer 21 and transmits the pressure to the controller 30.

In this case, the reason why the spacer 21 is provided is to detect the presence or absence of rain. When the rain does not rain, the pressure applied to the first piezoelectric sensor 10 and the second piezoelectric sensor 20 is similar, This is because the first piezoelectric sensor 10 receives more pressure than the second piezoelectric sensor 20 when it rains.

Therefore, the second piezoelectric sensor 20 provides the reference pressure due to the spacer 21, and the first piezoelectric sensor 10 provides the controller 30 with the pressure increased or decreased depending on the presence or absence of rain. The difference between the reference pressure and the increased or decreased pressure can be used to determine the presence or absence of rain.

Thus, the controller 30 filters and amplifies an input value through a filter / amplifier 31 and compares the input value with a preset value stored in the comparator 32 to determine whether to drive the wiper motor 40. Done.

Here, the set value is preferably set by a plurality of tests, and is a matter to be considered when designing the comparator 33 of the control unit 30. Although the comparator 33 is not used, a storage device such as a memory and It is also preferable to have a CPU, such as a microcontroller, to set the set value as a variable according to a plurality of situations, and to input and control a plurality of inputs to be flexibly applied.

Here, the wiper motor 40 is driven by the voltage applied from the power supply unit 60, such as a battery (Battery), and if the increase or decrease of the current is detected, the friction force between the wiper and the windshield can be estimated. Can be.

In addition, the controller 30 includes a current sensing unit 35 for measuring a current (Current Flow) flowing to the wiper motor 40, the current of the wiper motor 40 sensed by the current sensing unit 35 Determination of the rainfall through, by using this to generate a feedback signal to control the speed of the wiper motor (40).

For example, if the current value detected by the current detector 35 is less than or equal to the preset setting value, it is determined that rainfall is high, the speed of the wiper motor 40 is increased, and the current detector 35 detects the current value. When a current value is tested and exceeds a preset set value, it is determined that rainfall is small and the speed of the wiper motor 40 is reduced.

That is, the first piezoelectric sensor 10 and the second piezoelectric sensor 20 determines the presence or absence of rain, precipitation is determined according to the drive current of the current sensing unit 35 to determine the rain detection system according to the present invention (3) to control.

In addition, the component according to the method of using the piezoelectric sensor 50 outside the vehicle includes a piezoelectric sensor 50 and a sound absorbing member 51, a controller 30, a wiper motor 40, and a current sensing unit provided to surround the piezoelectric sensor 50. It comprises a 35 and the power supply unit 60.

Here, the piezoelectric sensor 50 attached to the outside of the vehicle to detect the pressure applied to the vehicle is wrapped in the sound absorbing member 51.

First, the piezoelectric sensor 50 transmits the pressure applied to the vehicle to the controller 30, and the controller 30 filters and amplifies an input value through a filter / amplifier 31, and comparator In operation 32, it is determined whether the wiper motor 40 is driven by comparing with the preset value.

Here, the wiper motor 40 is driven by the voltage applied from the power supply unit 60, such as a battery (Battery), and if the increase or decrease of the current is detected, the friction force between the wiper and the windshield can be estimated. Can be.

In addition, the controller 30 includes a current sensing unit 35 for measuring a current (Current Flow) flowing to the wiper motor 40, the current of the wiper motor 40 sensed by the current sensing unit 35 Determination of the rainfall through, by using this to generate a feedback signal to control the speed of the wiper motor (40).

For example, if the current value detected by the current detector 35 is less than or equal to the preset setting value, it is determined that rainfall is high, the speed of the wiper motor 40 is increased, and the current detector 35 detects the current value. When a current value is tested and exceeds a preset set value, it is determined that rainfall is small and the speed of the wiper motor 40 is reduced.

That is, the first piezoelectric sensor 10 and the second piezoelectric sensor 20 determines the presence or absence of rain, precipitation is determined according to the drive current of the current sensing unit 35 to determine the rain detection system according to the present invention (3) to control.

Hereinafter, a control method of a vehicle non-sensing system according to the present embodiment will be described.

First, each of the first pressure and the second pressure detected by the first piezoelectric sensor 10 and the second piezoelectric sensor 20 moves to the controller 30 (S31a).

In addition, the controller 30 performs the step of filtering and amplifying each of the received signals and comparing them with a previously stored set value (S32a).

Meanwhile, the piezoelectric sensor 50 provided with the sound absorbing member 51 outside the vehicle detects the pressure through the sound absorbing member 51, and controls the pressure of the rain detected by the piezoelectric sensor 50. (S31b), and filtering and amplifying each of the received signal, and compares it with a previously stored threshold (S32b).

When the comparison result of steps S32a and S32b exceeds a set value and a threshold value, the controller 30 outputs a control signal to drive the wiper because it is raining (S33).

In addition, in order to measure the intensity of the rain, which is the rainfall, the driving current of the wiper motor 40 is detected by the current sensing unit 35 (S34), and the driving of the wiper motor 40 sensed by the current sensing unit 35. The current is compared in the controller 30 (S35).

Here, the comparator 33 of the control unit 30 executes a step (S36) asking whether the driving current is tested and exceeds a previously stored set value, and as a result, if the driving current exceeds the reference value, rainfall Since this is a relatively small case, the speed of the wiper motor 40 is reduced so that the wiper is driven relatively slowly (S37).

On the other hand, when the drive current is less than the reference value because the rainfall is relatively high, the speed of the wiper motor 40 is increased to drive the wiper relatively fast (S38).

In addition, if the wiper motor 40 is stopped (S39) is executed, and if the wiper motor 40 is driven, the rain is continuously falling, and thus the user does not stop the wiper. S31-1b) to continuously control the wiper speed, and when the wiper motor 40 is not driven because the rain does not rain and the wiper is stopped by the user, the method for controlling a vehicle non-sensing system according to the present invention Quit.

In the above described exemplary embodiments of the present invention by way of example, the scope of the present invention is not limited to this specific embodiment, and those skilled in the art within the scope described in the claims of the present invention Changes may be made as appropriate.

1 is a block diagram schematically showing a vehicle non-sensing system according to the present invention.

FIG. 2 is a flowchart schematically illustrating a method for controlling a vehicle non-sensing system of FIG. 1.

Figure 3 is a block diagram schematically showing a vehicle non-sensing system according to the present invention.

4 is a flowchart schematically illustrating a method for controlling a vehicle non-sensing system of FIG. 3.

Figure 5 is a block diagram schematically showing a vehicle non-sensing system according to the present invention.

FIG. 6 is a flowchart schematically illustrating a method for controlling a vehicle non-sensing system of FIG. 5. FIG.

        <Brief description of reference numerals for the main parts of the drawings>

1, 2, 3: vehicle non-sensing system 10: first piezoelectric sensor

20: second piezoelectric sensor 21: spacer member

30 control unit 31 filter / amplifier

32: comparator 35: current sensing unit

40: wiper motor 50: piezoelectric sensor

51: sound absorption member 60: power supply

Claims (10)

A piezoelectric sensor attached to an outside of the windshield of the vehicle and capable of detecting the presence or absence of rain by the pressure applied to the vehicle; A control unit for outputting a control signal for driving to remove the ratio of the windshield of the vehicle according to the value detected by the piezoelectric sensor; A wiper motor driven to remove rain of the vehicle windshield according to the output of the controller; Vehicle non-sensing system comprising a. The method according to claim 1, The vehicle non-sensing system includes a current sensing unit configured to sense a current input to the wiper motor to sense a friction force between the wiper and the windshield; Vehicle non-sensing system further comprises. The method according to claim 2, The controller reduces the driving speed of the wiper motor when the driving current of the wiper motor exceeds a preset reference value by using the sensed current value of the current sensing unit, and the driving current of the wiper motor is less than or equal to the preset reference value. Non-sensing system for a vehicle, characterized in that for increasing the drive speed of the rear wiper motor. The method according to claim 1, The vehicle rain detection system includes a first piezoelectric sensor provided inside the vehicle windshield for detecting the presence or absence of rain; A second piezoelectric sensor provided inside the front glass and spaced apart from the front glass by a spacer; Vehicle non-sensing system further comprises. The method according to claim 4, The rain detection system for a vehicle, characterized in that the control unit determines the presence or absence of rain using the difference between the detection value of the first piezoelectric sensor and the second piezoelectric sensor. The method according to claim 1, The piezoelectric sensor may include a sound absorbing member that absorbs sound; Vehicle non-sensing system characterized in that it further comprises. A first step of the control unit detecting a current flowing to the wiper motor that drives the wiper for removing the foreign matter from the vehicle windshield; A second step of determining, by the controller, whether a current flowing to the wiper motor exceeds a preset reference value; When the control unit exceeds the reference value, it is determined that the amount of rainfall is small, so that the frictional force between the wiper and the windshield is large, and the wiper motor speed is decreased. Determining that the number is small and increasing the wiper motor speed; Vehicle non-sensing system control method comprising a. A first step of determining whether rain is present or not by using a pressure applied to the vehicle by the piezoelectric sensor provided outside the vehicle windshield; A second step of transmitting the intensity of the rain to the controller when the piezoelectric sensor senses the rain; The control unit drives a wiper motor according to the detected value of the piezoelectric sensor; Vehicle non-sensing system control method comprising a. A first step of transmitting a detected value to a control unit in a first piezoelectric sensor provided inside the vehicle windshield and a second piezoelectric sensor provided spaced apart from the windshield at a predetermined interval; A second step of comparing, by the controller, detection values of the first piezoelectric sensor and the second piezoelectric sensor and determining that the rain is detected when the preset value is exceeded; A third step of determining, by the controller, a rainfall according to detection values of the first piezoelectric sensor and the second piezoelectric sensor, and controlling a speed of the wiper motor according to the rainfall; Vehicle non-sensing system control method comprising a. A first step of determining the presence or absence of rain in the control unit using a piezoelectric sensor attached to the vehicle windshield; A second step of sensing a current flowing to the wiper motor when the rain is detected by the piezoelectric sensor; Determining, by the controller, whether the current flowing to the wiper motor exceeds a preset reference value; When the control unit exceeds the reference value, it is determined that the amount of rainfall is small, so that the frictional force between the wiper and the windshield is large, and the wiper motor speed is decreased. A fourth step of judging less and increasing the wiper motor speed; Vehicle non-sensing system control method comprising a.

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