KR100384037B1 - Device for protecting a snow wiper of an automobile - Google Patents

Abstract

The present invention relates to a snow wiper protection device for a vehicle that can prevent damage to the wiper motor by detecting power when the wiper does not return to the original automatic stop position due to snow accumulation at the bottom of the windshield. The protection device detects the first relay 22 for supplying battery power to the wiper motor 12 and the wiper parking position for detecting the position where the wiper blade 8 is stopped according to the operation of the wiper switch 32. A second relay 24 for selectively blocking the battery power supplied to the wiper motor 12 by operating the sensor 36, the wiper parking switch 26, and the parking delivered from the wiper parking position sensor 36. The control oil which sends a control signal to the second relay 24 based on the signal and cuts off the battery power supplied to the wiper motor 12 when the parking signal satisfies a predetermined condition. It is composed of 20.

Description

DEVICE FOR PROTECTING A SNOW WIPER OF AN AUTOMOBILE

The present invention relates to a snow wiper protection device of a vehicle, and more particularly, by sending a signal to the second relay on the basis of a signal transmitted from the wiper parking position detecting sensor to automatically cut off the power supplied to the wiper, The present invention relates to a snow wiper protection device of a vehicle that can prevent damage.

Windshields are fitted on the front of the car to prevent wind from entering the front while driving. When dust or dirt accumulates on the surface of the windshield, it is difficult to secure the clock in front of it, especially when driving in snow or rainy areas. Can be. For this purpose, the vehicle is equipped with a wiper system to remove dust and rain on the windshield surface.

In the structure of the wiper system, a pivot shaft which receives the rotational force of the wiper motor through a frame fixed to the vehicle body through a plurality of fastening holes, a wiper motor fixed to the frame, a link rod and a drive arm, and a pivot shaft It consists of a wiper arm which is fixed to and rotates over the windshield with the wiper blade.

In addition, when the wiper is operated to remove dust or foreign matter on the windshield surface, the washer liquid is used to increase the cleaning effect. The washer fluid injector consists of a washer tank that stores washer fluid, a washer motor attached to the washer tank for pumping washer fluid stored in the washer tank, and a washer motor that is pumped through the washer fluid hose from the washer tank by the operation of the washer motor. It consists of a washer nozzle for spraying washer fluid into the windshield. This wiper system is operated according to the operating circuit shown in FIG.

That is, when the battery power is applied to the ignition switch IGN2, the wiper switch provided in the multi-function switch is operated to operate at high speed, low speed and intermittent INT. Depending on the combination of the multifunction switch, high speed or low speed or intermittent operation is connected with the ground contact (GND). In this state, when the battery power is applied to the wiper motor 12 and grounded by a combination of multifunction switches to start the wiper motor 12, the wiper arm is operated in accordance with the operation of the above-described components to move the blade. To start. On the other hand, when the wiper is stopped, the terminal P-B of the worm wheel contact plate of the wiper motor 12 is connected to stop by the equipotential. In the case of the washer fluid motor 14, the washer fluid is operated by a battery power source applied according to the operation of the washer switch integrally provided in the multifunction switch to press the washer fluid in the washer tank toward the washer nozzle.

As such, the conventional wiper system consists of a control method in which the voltage of the wiper motor is always on and controls the operation of the wiper by turning on or off the ground contact GND in the multifunction switch. For example, in the case of operating the wiper at high speed, if the wiper switch is set to the high speed position, the wiper operates at high speed. If the wiper switch is turned off while the wiper is in operation, the wiper is stopped by the insulator attached to the cam plate of the wiper. The wiper is no longer powered until it returns to the wiper and the wiper stops.

However, as shown in Fig. 2, when snow is accumulated at the bottom of the windshield in a large area or in cold winter, when the switch is turned off after the wiper is operated, the wiper blade 8 fitted to the wiper arm 6 It does not return to the automatic stop position L2, but it stops by the eye at the point L1 shown in FIG. At this time, the wiper motor is stopped between the contacts of the cam plate (not shown). As such, the reason why the wiper blade 8 does not return to the automatic stop position L2 is that the wiper blade 8 has energy to go down, and thus the energy is rotated between the cam plates, where the current supply of the motor is stopped. It moves in the opposite direction. As a result, power is supplied again from the wiper motor, and this phenomenon is repeated, causing the worm gear to melt and damage the wiper motor. Typically, the rotational force of the wiper motor 12 is transmitted to the wiper arm 6 via the wiper link 4.

In order to solve this problem, Japanese Patent Laid-Open Publication No. 2000-203392 published on July 25, 2000, when snow pushed by the wiper on a snowy day accumulates on the lower cowl panel part of the front glass, hinders the operation of the wiper, An apparatus for removing snow and water droplets accumulated in a glass portion of an automobile is disclosed. This device uses the engine's negative pressure to supply air to the windshield where snow is accumulated to melt the snow.

However, this apparatus is provided with a negative pressure valve and a standby valve as well as a branch generator, which has a large number of parts and a complicated structure, causing a cost increase.

In addition, Japanese Patent Application Laid-open No. Hei 10-035422 published on February 10, 1998, can suppress or avoid snow adhesion to the blade by the snow melting action, and contribute to safe operation by securing a driving clock. A vehicle wiper device is disclosed. According to this configuration, the cover member is mounted around the wiper blade, and the cover member is provided with a hot air inlet through which hot air for vehicle heating can be introduced, and the hot air introduced into the cover member can be released toward the glass. It has a structure that forms an outlet.

This also includes a cover member attached to the wiper blade separately, a hot air inlet and a discharge port, and the overall structure is complicated and causes a cost increase.

The present invention for solving this problem is to change the conventional-control method to + control method and add a second relay at the same time, the snow is accumulated at the bottom of the windshield, so that the wiper does not return to the original automatic stop position. The purpose of the present invention is to provide a snow wiper protection device for a vehicle that can prevent damage to the wiper motor by automatically detecting power when it is not detected and then shutting off the power supplied to the wiper.

1 is an electrical circuit diagram showing a conventional wiper system,

2 is a front view of the windshield showing the stop position of the wiper when snow is accumulated at the bottom of the windshield;

3 is an electrical circuit diagram showing a wiper protection device according to the present invention,

Figure 4 is a block diagram showing a wiper protection device according to the present invention,

5 is a flowchart illustrating a control process of the wiper protection device according to the present invention.

[Explanation of symbols on the main parts of the drawings]

2: Windshield 6: Wiper Arm

8: wiper blade 12: wiper motor

14: washer fluid motor 20: control unit

22, 24: 1st, 2nd relay 36: Wiper parking position sensor

Snow wiper protection device of the vehicle of the present invention for achieving the above object is a wiper system of the vehicle for transmitting the rotational force of the wiper motor operated by the battery power supply to the wiper arm through the wiper link to rotate the wiper blade, the wiper A first relay for supplying battery power to the wiper motor according to the operation of the switch, a wiper parking position sensor for detecting a position at which the wiper blade is stopped, and a wiper parking switch operated to be supplied to the wiper motor The wiper motor when the parking signal satisfies a predetermined condition by sending a control signal to the second relay based on a second relay for selectively shutting off battery power and a parking signal transmitted from the wiper parking position sensor; To cut off the battery power supply It characterized in that it includes a unit.

Hereinafter, a snow wiper protection device for a vehicle according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 3 to 5.

3 is an electrical circuit diagram showing a wiper protection device according to the invention, Figure 4 is a block diagram showing a wiper protection device according to the present invention.

In order to prevent damage to the wiper motor due to snow accumulated at the bottom of the windshield, a preferred embodiment of the present invention is a structure in which a second relay is added while changing from a conventional -control control method to a + control control method. Is illustrated. Here, the + control control method is a method of turning on / off the wiper by controlling the power supplied from the battery to the wiper motor instead of the control through the wiper ground terminal (GND).

As shown in FIGS. 3 and 4, the snow wiper protection device according to the preferred embodiment of the present invention may include a first relay 22 for supplying battery power to the wiper motor 12 according to an operation of the wiper switch 32. ), The wiper parking position sensor 36 for detecting the position where the wiper blade 8 is stopped, and the wiper parking switch 26 are operated to selectively cut off the battery power supplied to the wiper motor 12. The control signal is sent to the second relay 24 based on the second relay 24 and the parking signal transmitted from the wiper parking position sensor 36, and the wiper motor (if the parking signal satisfies a predetermined condition). 12) is composed of a control unit (BCM) 20 to cut off the battery power supplied to.

Here, the first relay 22 is connected to the wiper motor 12 so as to be selectively connected and disconnected through the wiper parking switch 26. When the multifunction switch is operated, power of the battery is supplied to the wiper motor 12 or the washer fluid motor 14 to operate it, and when the wiper is parked, the first relay 22 according to the operation of the wiper parking switch 26. The battery power supplied to the wiper motor 12 is cut off to stop the wiper. In addition, the wiper parking switch 26 is also operated by the second relay 24 operated by the control signal transmitted from the control unit 20 to selectively block the battery power supplied to the wiper motor 12.

Here, when the control unit 20 operates the wiper switch 32 or the washer fluid switch 34 when the ignition switch 30 is turned on as in the prior art, the power of the battery is supplied to the wiper motor based on the signal input at this time. (12) or controlled to be supplied to the washer liquid motor 14 to operate the wiper or to eject the washer liquid.

At this time, if the driver positions the wiper switch 32 at high speed to operate the wiper at high speed, the wiper protection device according to the present invention is made by the contact structure of the multifunction switch in the same way as the conventional -control control method. At this time, when the wiper switch is turned off, the operation up to the wiper stop position is not performed by the internal cam plate of the wiper motor 12 but by the second relay 24 terminal in the control unit (BCM) 20.

That is, the control of the battery power supplied to the wiper motor 12 is performed in a separate control unit 20, the wiper parking position sensor (when the wiper does not go to the stop position by the snow accumulated at the bottom of the windshield) The controller 36 detects this, and the control unit 20 outputs a control signal to the second relay 24 based on the signal transmitted from the sensor 36 to operate the wiper parking switch 26 to operate the wiper motor. The power supplied to (12) is cut off.

Here, the conditions for shutting off the battery power supplied to the wiper motor 12 under the control of the control unit 20 can be set in various forms, but the present embodiment has illustrated the following two forms. First, the control unit 20 may turn off the power when the detection signal from the wiper parking position sensor 36 is detected more than a predetermined number of times (for example, five times) within a predetermined time (for example, 200 msec). Second, a method of stopping the wiper motor 12 by sending a signal to the second relay 24 when the wiper parking position sensor 36 is not input for more than a predetermined time (for example, 5 seconds). It was. This will be described in more detail with reference to FIG. 5 below.

5 is a flowchart illustrating a control process of the wiper protection device according to the present invention.

If the operation signal of the intermittent switch is input in the on state of the ignition switch 30 (S1), the process proceeds to step S11 to operate the first relay 22 for an intermittent time set by the driver. On the other hand, when the operation signal of the intermittent switch is not input, the process proceeds to step S3 or S3 '. At this time, when the high speed or low speed wiper switch operation is input, the wiper motor 12 is driven at high speed or low speed (steps S4, 7). .

Next, if the switch-off signal is input while the wiper motor 12 is driven at high speed, the wiper motor 12 is driven at low speed, while the switch-off signal is input while the wiper motor 12 is driven at low speed ( YES in step S8), the process proceeds to step S9.

In step S9, it is determined whether the parking signal input from the wiper parking position detecting sensor 36 is input within a predetermined time period among the two power cutoff conditions described above. At this time, when the parking signal is longer than a predetermined time (for example, 200 msec) (NO in step S10), the power to the battery is cut off to stop the wiper motor 12, and when it is within the predetermined time, the process proceeds to step S13.

On the other hand, after the first relay 22 is operated for the set intermittent time in step S11, it is determined whether the stopper time E of the wiper is equal to or greater than a predetermined time (for example, 5 seconds) and is equal to or greater than the predetermined time (that is, E ≥5 seconds), a signal is sent to the second relay 24 to cut off the power supplied to the wiper motor 12.

According to the present invention described above, by sending a signal to the second relay on the basis of the signal transmitted from the wiper parking position sensor can automatically cut off the power supplied to the wiper to prevent damage to the wiper motor, thereby, Precise control of the circuit is possible.

Claims (3)

In a vehicle wiper system which rotates the wiper blade by transmitting the rotational force of the wiper motor driven by the battery power to the wiper arm through the wiper link, A first relay 22 for supplying battery power to the wiper motor 12 according to the operation of the wiper switch 32; A wiper parking position detecting sensor 36 for detecting a position at which the wiper blade 8 is stopped, A second relay 24 for operating the wiper parking switch 26 to selectively cut off battery power supplied to the wiper motor 12; When the parking signal satisfies a predetermined condition by sending a control signal to the second relay 24 based on the parking signal transmitted from the wiper parking position sensor 36, the wiper motor 12 may be supplied to the wiper motor 12. Snow wiper protection device for a vehicle, characterized in that it comprises a control unit 20 for shutting off the battery power. According to claim 1, wherein the control unit 20 is the second when the detection signal from the wiper parking position detection sensor 36 is detected a predetermined number or more within a predetermined time or the detection signal is not input for a predetermined time or more Snow wiper protection device for a vehicle, characterized in that to stop the wiper motor 12 by sending a signal to the relay (24). The method of claim 1, wherein the control unit 20 is a detection signal from the wiper parking position sensor 36 is detected, for example, more than five times within 200msec, for example, or the detection signal is not input, for example, more than 5 seconds The device of claim 1, wherein the wiper motor (12) is stopped by sending a signal to the second relay (24).