DE102008007527A1 - Windscreen wiper system for vehicle, has rain sensor for controlling wiper motor and wiper drive, where wiper motor has interval operation mode and continuous mode with different blade speeds - Google Patents

Abstract

Ranlage for a vehicle with a rain sensor for controlling a wiper motor and thus the wiper operation, in which the wiper motor has an interval mode and a continuous mode with different wiping speeds, given by a control unit, and activated to a switching command and can be deactivated by another switching command, and in which the operating mode and the wiper speed of the wiper motor during wiper operation is automatically selected as a function of the output signal of the rain sensor. It solves the problem of designing such a windshield wiper system so that a temporary disturbance of the wiper operation can be bridged by a falsified output signal of the rain sensor. For this purpose, the rain sensor (5) by an additional switching command for a predetermined period of time can be deactivated, connected to a change of the wiper motor (3) in the interval mode (11), and at the end of the period is automatically switched back to the rain sensor mode.

Description

The The invention relates to a windscreen wiper system for a vehicle with a rain sensor, depending on this the wetting of the vehicle window by raindrops the speed the windshield wiper motor influenced, in particular a windshield wiper system for the windshield of the vehicle.

In such a windshield wiper system, the rain sensor detects in a known manner ( DE-GM 9309837 ) the extent of wetting of the vehicle window by raindrops and outputs a the extent of wetting per unit area and / or per unit time proportional output signal to a control unit, which converts this in a known manner and depending on this in the continuous mode wiper speed and in the interval operating mode, the wiping interval ( the pause time) of the windshield wiper motor controls. With greater wetting and thus with greater rainfall, the speed of the windshield wiper motor is raised or the wiping interval is shortened.

At one in the DE 19516 507 A1 described windshield wiper system, in which the windshield wiper motor can be operated at different speeds and depending on the output of the rain sensor, in addition to the output signal of the same speed is taken into account, that in continuous operation with an increase in vehicle speed, the speed of the windshield wiper motor increases and in the interval Pause time is further shortened. The setting of the different operating modes is preselected by the vehicle user. When falling below a predetermined pause time, for example, 3 seconds, but is automatically switched from interval to continuous operation. The speed of the windscreen wiper motor is preferably varied in steps.

When in the DE 197 56 429 A1 described windshield wiper system with a rain sensor, the operating mode of the windscreen wiper (continuous operation or interval operation) is automatically adjusted to the actual amount of rain, so that the vehicle user is largely relieved of the choice of wiper mode and this to activate the windshield wiper system only by a switching command, especially on a push button and needs to be deactivated again by another switching command. It can be in a known manner, the wiper speed in the continuous mode depending on the output signal of the rain sensor. In addition, two continuous modes with different speeds can be set on the push-button.

The above-described windshield wiper systems work with a rain sensor satisfactory on the basis of an unadulterated Output signal. However, this can be done by the vehicle window reaching impurities or deposits, such as dirt, wax from a car wash or snowflakes, falsified be so that the rain sensor operation is disturbed and the windshield wiper system, for example, not in the preprogrammed Clock and not with the preprogrammed speed in intermittent operation is working. In this case, the windshield wiper system so except Advised that the vehicle user is irritated.

It Object of the invention, a windshield wiper system for a vehicle with a rain sensor according to the preamble of the claim 1 so that a temporary disturbance of the wiper operation bridged by a falsified output of the rain sensor is.

These Task is by a windshield wiper system according to the preamble of claim 1 solved by its characterizing features. Advantageous embodiments are in the subclaims listed.

The invention comprises a windshield wiper system with a rain sensor for controlling a wiper motor with at least one interval mode and at least one continuous mode and with different wiping speeds, predetermined by a control unit which can be activated in response to a switching command and deactivated by a further switching command, and in which the operating mode and the Wiper speed during wiper operation is automatically selected in response to the output of the rain sensor. It consists in that the rain sensor can be deactivated by an additional switching command for a predetermined period of time, and the windshield wiper system automatically goes into intermittent operation in this deactivation, and that is automatically switched back to the rain sensor operation after the time has expired. By this measure, a falsified output of the rain sensor, caused for example by an occurring contamination of the vehicle window or other deposits on this in addition to the wetting of the same by raindrops, which has an abnormal interval operation result, temporarily interrupted and the wiper operation during the interruption with a predetermined pause time and continue at a predetermined speed. After a likewise predetermined number of wiping cycles, during which the contamination or the deposits are eliminated, it is automatically switched back into the rain sensor mode. The additional switching command for deactivating the rain Sensor operation can be advantageously triggered by an operation of the tip-wiper switch.

The Invention will be described below with reference to an embodiment explained. The only accompanying drawing shows the scheme of a windshield wiper system.

The windscreen wiper system 1 has a windshield wiper 2 on top of a wiper motor 3 is driven and oscillating a wiping field 4 swept over on a vehicle window. In the area of the wiping field 4 is a rain sensor 5 arranged, which detects the wetting of the vehicle window, in particular by raindrops and to an electronic control system 6 reports. The control electronics 6 also has inputs for a windscreen wiper switch 7 and outputs for controlling the wiper motor 3 , The windscreen wiper switch 7 has switch positions for a tip wipe 8th (One-time cycle), for continuous operation 9 , a fast continuous operation 10 , an interval operation without rain sensor 11 and an interval operation with rain sensor 12 on, for the rain sensor 5 the automatic determination of the pause time of the windscreen wiper is used.

The wiper motor 3 is thus in the switch position "Interval operation 12 "through the rain sensor 5 influenced, with a higher measured amount of rain causes automatic automatic adjustment in an interval operation with a shorter pause time or in a continuous operation. In the event that the vehicle window is in the area of the rain sensor 5 In addition to wetting with raindrops with dirt or snowflakes, the output of the rain sensor becomes wet 5 falsified and no longer corresponds to the wetting situation of the vehicle window outside the area in which the rain sensor 5 is arranged. That means the control electronics 6 Inappropriate responding to the general wetting situation and the wiper motor 3 compared to this controls wrong, so too fast and too irregular to run, so that this irritates the vehicle user.

In this case, this has the opportunity by the operation of the tip wiping (switch position 8th ) to exit the rain sensor operation for a predetermined period of time and in the interval mode 11 to change at a given speed and pause time. This period includes, for example 6 Wiping cycles, whereby it is assumed that the disturbing wetting is eliminated in addition to the raindrops after this short-term interval operation. After the sixth wiping cycle, the control electronics switches 6 automatically returns to rain sensor operation, which can then be carried out without interruption in intermittent operation or in heavy (raindrop) wetting in continuous operation.

1

windshield wiper system

2

windshield wipers

3

wiper motor

4

wiping field

5

rain sensor

6

control electronics

7

wiper switch

8th

switch position Finger-operated wiping

9

switch position continuous operation

10

switch position fast continuous operation

11

switch position Intermittent operation without rain sensor

12

switch position Interval operation with rain sensor

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 9309837 [0002]
• DE 19516507 A1 [0003]
• - DE 19756429 A1 [0004]

Claims (3)

Windscreen wiper system for a vehicle with a rain sensor for controlling a wiper motor and thus the wiper operation, in which the wiper motor has at least one Intervallbetriebsart and at least one continuous mode with different Wischgeschwindigkeiten, specified by a control unit, and can be activated in response to a switching command and deactivated by another switching command in which the operating mode and the wiping speed during wiper operation are selected automatically as a function of the output signal of the rain sensor, characterized in that the rain sensor ( 5 ) is deactivated by an additional switching command for a predetermined period of time, associated with a change of the wiper motor ( 3 ) in the interval mode ( 11 ), and that at the end of the period from the interval operation ( 11 ) is automatically changed back into the rain sensor mode. Windscreen wiper system according to claim 1, characterized in that the additional switching command for the deactivation of the rain sensor operation by an actuation of the windscreen wiper switch ( 7 ) for performing the tip wiping ( 8th ) is triggered. Windscreen wiper system according to claim 1, characterized the time duration comprises a predetermined number of wipe cycles.