KR101723844B1

KR101723844B1 - wiper apparatus

Info

Publication number: KR101723844B1
Application number: KR1020150161461A
Authority: KR
Inventors: 백남석
Original assignee: (주)티에이치엔
Priority date: 2015-11-18
Filing date: 2015-11-18
Publication date: 2017-04-06

Abstract

The present invention provides a function of automatically driving a wiper when it rains and automatically stopping the wiper when it stops raining to a wiper. Thus, the present invention can reduce a rate of an accident being generated by preventing drivers carelessness in accordance with control of the wiper, and provide an effect of preventing the disturbance of drivers view caused by a wiper when it stops raining, as well as preventing the abrasion of the wiper. To achieve this, the present invention includes a motor, a detection resistance, a control signal generation circuit, an amplifier, a level determination circuit, a timer circuit, an input discrimination circuit, an amplifier, and a driving circuit.

Description

[0001] The present invention relates to a wiper apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper device, and more particularly, to a wiper device for reciprocally moving a wiper to remove raindrops and the like.

2. Description of the Related Art Conventionally, a vehicle such as an automobile has a wiper device for removing raindrops attached to windshields by rainfall or the like.

In the above-mentioned wiper apparatus, when the rain comes, the driver turns on the wiper operating switch to cause the wiper to reciprocate, and when the ratio is not reached, the driver turns off the wiper operating switch to stop the reciprocating motion of the wiper.

Then, the wiper is driven by changing the speed of reciprocating motion of the wiper to the high, low, intermittent, and other phases in accordance with the amount of raising by the operation changeover switch.

However, in the case of a busy road, turning on / off the wiper drive can increase the incidence of an accident, and even in the event of rain, the wiper is continuously turned on to prevent inadvertent driving, If the wiper is not driven off in a timely manner, the wiper slides on the windshield which is in a dry state in which the ratio is high and the coefficient of friction is high, so that the wiper is easily worn and the driving visibility is prevented.

The present invention has a problem in solving the above-mentioned problems.

The present invention can solve the above problems by providing the wiper device with a function of automatically driving the wiper when it is raining and stopping the wiper automatically when the ratio is stopped.

According to the present invention, it is possible to prevent a driver from being neglected due to the operation of the wiper and to reduce the accident occurrence rate, and to provide an action effect of preventing the wiper from being worn by obstructing the driving visibility of the wiper due to rain can do.

1 is a circuit diagram showing an embodiment of the present invention;
Fig. 2 is a characteristic diagram showing a change in load current flowing in the driving motor. Fig.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.

Reference numeral 11 in Fig. 1 denotes a motor for driving the wiper 12 provided on the windshield or the like, and the driving motor is connected in series to the power supply circuit.

Reference numeral 13 denotes a detection resistor, which is connected in series to the motor 11. The detecting resistor 13 detects a change in the frictional resistance occurring between the wiper and the windshield of the automobile by using a resistor element of a fixed resistor or a half-fixed resistor at a subsequent stage due to a change in current flowing in the motor 11. That is, the detection resistor 13 functions to convert the change of the current flowing through the motor 11 into the change of the voltage drop.

Reference numeral 14 denotes a control signal generating circuit such as a differential circuit which is connected to both ends of the detecting resistor 13 and is composed of a capacitor 14a and a differential resistor 14b, And generates the control signal according to the magnitude of the voltage change.

Reference numeral 15 denotes an amplifier which receives an input from the control signal generating circuit 14 and outputs it to a smoothing circuit 16 composed of a diode 16a and a capacitor 16b provided at the subsequent stage.

On the other hand, reference numeral 17 denotes a Schmitt circuit or the like whose starting point is extremely sensitive, for example, a variable resistor (not shown) capable of adjusting a set value to the output level output from the smoothing circuit 16, The level discriminating circuit 17 is a level discriminating circuit including a reference level setting member as a circuit constituting member between the wiper 12 and the windshield face For example, a voltage due to the overload current of the motor 11 obtained by the control signal generating circuit 14 as the current change detecting element, even in a state where the frictional resistance between them is temporarily increased due to the temporary presence of foreign matter or the like. Since the descent signal does not reach the reference level by the action of the smoothing circuit 16 in the subsequent stage, the level discriminating circuit 17 is operated by the state (cause) And it has a malfunction prevention function to prevent paper.

Reference numeral 18 denotes a timer circuit such as a one-shot multivibrator which is connected in the middle of a transmission path between the input discriminating circuit 19 and the level discriminating circuit 17 to be described later, .

Reference numeral 19 denotes the above-mentioned input discriminating circuit, which is a circuit for outputting an output signal by reversing, for example, setting or resetting each time an input signal of another numerical value such as a flip flap circuit or a lock circuit is alternately received.

Reference numeral 20 denotes an amplifier, which is provided with an input to the input discriminating circuit 19, for example, provided at a part of the body of the vehicle, or, for example, according to the presence or absence of a raindrop (Not shown) that is configured to change the input signal. Reference numeral 20a denotes an input terminal thereof.

Reference numeral 21 denotes a drive circuit composed of a relay circuit or the like which operates upon receipt of an output signal from the input discriminating circuit 19. This is a drive circuit which is connected in series to the power supply circuit of the motor 11, .

Although not shown in the drawing, the input terminal of the input discriminating circuit 19 is provided with an input terminal for manually or automatically switching input to the drive circuit 21, Unlike the driving device, it is possible to manually configure the wiper as before.

The operation state of the automatic driving device of the wiper according to the present invention constructed as described above will be described below. When the automobile starts to rain when the automobile is in operation, a right-side detector, not shown in the figure, detects the right- An input signal is given to the input discriminating circuit 19 through the amplifier 20. Therefore, the input discriminating circuit 19 inverts the circuit state and outputs an input to the driving circuit 21 in the subsequent stage. The driving circuit 21 is connected to the power feeding circuit of the motor 11 Closing the wiper so as to start the wiper, and the front glass surface in a state in which the rain is lowered is slid and reciprocally moved normally to remove the object attached to the windshield surface.

Next, in the case where the ratio is reduced or the ratio is reduced, the frictional resistance generated between the wiper 12 and the windshield surface gradually increases. Therefore, the load current flowing through the motor 11 gradually increases with the increase of the frictional resistance, and the current change at the time of reciprocation also increases. The curve after time t1 in Fig. 2A shows a change in the load current of the motor 11 involved in this case. The control signal generating circuit 14 composed of a differential circuit or the like is connected to the control terminal of the control signal generation circuit 14 by the voltage change at the terminal of the detection resistor 13, that is, the magnitude of the voltage drop due to the change in the load current of the motor 11 after the time t1 in FIG. And gives a control signal for starting operation to the circuit at the subsequent stage.

The differential signal as the control signal is amplified by the amplifier 15 and then converted into a level averaged by the smoothing circuit 16. When the level thereof exceeds the reference level value provided in the next level discriminating circuit 17 , The level discrimination circuit 17 switches the operation state of the circuit, and the excess level signal is transmitted to the input discrimination circuit 19 through the timer circuit 18. [

Therefore, the input discriminating circuit 19 inverts the circuit state to stop the output to the driving circuit 21, and the active switch 11a is opened and the driving circuit 21 of the motor 11 is cut off do.

In this way, when the ratio is changed to the non-movable state, the driving of the wiper 12 is automatically stopped in accordance with the increase of the frictional resistance occurring between the wiper 12 and the windshield face.

However, even if the ratio is changed to the lukewarm state, the wiper is stopped on the windshield, and if the wiper is stopped for a while, The signal input from the timer circuit 18 to the input discriminating circuit 19 is stopped after a predetermined set time has elapsed at a preset time, that is, at the time of receiving the excess level signal, The input discriminating circuit 9 inverts again to operate the driving circuit 21 at the next stage and outputs the signal to the active switch 21a. As a result, the motor 11 is restarted and the wiper 12 is driven. Thereafter, in the light rain state, since the right detection signal is input to the input discriminating circuit 19 through the amplifier 20 by the terminal 20a, the above operation is repeated.

However, in the above case, even if the input to the input discriminating circuit 19 is stopped after a predetermined time set in advance by the timer circuit 18, if the detection signal to the terminal 20a by the right detector is not inputted, The operation of the discrimination circuit 19 does not change and the operation is kept in a state ready for operation until the switch 21a is turned off, that is, until the operation of the wiper 12 is stopped. Thereafter, When the input signal is input to the input discriminating circuit 19 through the amplifier 20 by the switch 20a, the switch 21a is closed and the wiper 12 starts the re-operation.

Of course, even if there is a signal input from the amplifier 20 to the input discriminating circuit 19 due to the detection of the object, the timer circuit 18 once starts to operate the timer circuit 18, The operation of the input discriminating circuit 19 is not reversed until the count is reached, and the switch 21a is kept open during this period.

That is, after the switch 21a is opened and the operation of the wiper 12 is stopped, even if the predetermined time of the timer circuit 18 has elapsed, The wiper 12 is not reactivated unless an enemy is detected.

However, if paper-like material or the like released from the small grain or the rain is present between the wiper 12 and the windshield surface, the frictional resistance therebetween is increased by the time t2 of FIG. The differential signal from the control signal generating circuit 14 generated by the abnormal state temporarily becomes larger than the differential signal in the normal normal state, but the smoothing circuit 16 generates a short- The level by this level is not reached to the reference level of the level discrimination circuit 17 and therefore the circuit state of each level discrimination circuit 17 is not changed and as a result, The device does not operate.

Next, when the ratio is completely reduced, there is no detection in the above-described right detector and no input is made to the input discriminating circuit 19, so that after the timer circuit 18 is operated and the switch 21a is opened, The agitating switch 21a completely disconnects the driving circuit of the motor 11 even when the predetermined count of the wiper 12 is finished and the driving of the wiper 12 is stopped.

11; Motor 12; Wiper, 15; Amplifier, 16, smoothing circuit, 17; A level discrimination circuit, 18; Timer circuit

Claims

A motor 11 for driving the wiper 12 provided on the windshield,
A detecting resistor 13 connected in series to the motor 11 and adapted to detect a change in frictional resistance occurring between the wiper and the windshield glass at a subsequent stage due to a current change in the motor 11,
A control signal generating circuit (14) connected to both ends of the detecting resistor (13), detecting a voltage change in the detecting resistor (13) and generating a control signal in accordance with the magnitude of the voltage change,
An amplifier 15 for receiving an input from the control signal generating circuit 14 and outputting it to a smoothing circuit 16 provided at the subsequent stage,
A level determination circuit (17) including a reference level setting member capable of adjusting a set value with respect to an output level output from the smoothing circuit (16)
A timer circuit 18 connected in the middle of the transmission path between the input discriminating circuit 19 and the level discriminating circuit 17 and capable of adjusting the operation time setting,
The input discriminating circuit 19 for inverting the setting and resetting each time the input signals are alternately received and outputting the output signal,
An amplifier 20 provided at a vehicle body part of the vehicle for receiving an input signal from a propulsion detector that inputs an input to the input discriminating circuit 19 and changes the electric conductor according to whether or not there is a raindrop;
And a drive circuit (21) having an actuation switch (21a) which is operated in response to an output signal from the input discriminating circuit (19) and which is connected in series to the power supply circuit of the motor (11) Characterized by a wiper device.