Windshield wiping system for motor vehicles

Electricity: motive power systems – Periodic – repetitious or successive operations control of...

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Details

318DIG2, 15250270, 1525034, B60S 108

Patent

active

051573148

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a wiping system or device for a windshield of a motor vehicle.
One wiping device for the windshield includes a wiper lever with a wiper element which contacts the windshield. The wiper lever is driven in a reciprocating manner between two reversing positions by a drive unit. The drive unit comprises an electric drive motor. Such a wiping device is already known (DE-OS 29 34 874) in which the size of the wiping field to be brushed over on the windshield by the wiper blades and its position on the windshield are subject to considerable changes which have been found extremely disturbing by motor vehicle manufacturers and their customers. This is caused by the fluctuating friction conditions between the windshield and the wiper element, changing frictional speeds of the wiper element on the windshield which, in connection with the inertial forces, elasticity and play in the wiping contact, as well as tolerances in the body, prevent the achievement of an optimal wiping field or the wiping field which has been predetermined with respect to construction, although the relative spacing of all articulation points of the wiping device is unchangeable during operation. However, the wiping field should reach as close as possible to the lateral edge of the windshield, particularly on the driver's side.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide a windshield wiping device which avoids the above described disadvantages.
This object and others which will be made more apparent hereinafter is attained in a wiping device for a windshield of a motor vehicle comprising a drive unit including an electric drive motor; a first and second wiper lever, each of the wiper levers having a wiper element for contacting the windshield; a first wiper shaft secured to the first wiper lever and a second wiper shaft secured to the second wiper lever, and a pendulum transmission connected to the drive unit and each of the wiper shafts so that the drive unit can impart a pendulum type motion to the first wiper lever and second wiper lever and each of the wiper levers is driven in a reciprocating manner between two reversing positions via the pendulum transmission. Each of the wiper levers is associated with a wiper field on the windshield over which the wiper element of the wiper lever brushes.
According to the invention a plurality of sensors and a control device connected to the sensors and the drive unit is provided. Each of the sensors is positioned in the motor vehicle to detect a predetermined operating position of a wiper lever. At least one sensor is located on the driver's side of the windshield and detects when the wiper lever on the driver's side reaches a reversing position located adjacent to a side edge of the windshield. Another of the sensors is located in the vicinity of another reversing position, the other reversing position being located outside the wiper field of the wiping lever associated with the other reversing position, advantageously at a parked position of the wiper lever. The control device connected with the drive unit and the sensors receives a signal generated by a sensor when one of the wiper levers reaches at least one of the predetermined operating positions and the control device controls the drive unit according to the sensors. Also an actuating element is connected to the control device and arranged in a connecting rod which is part of the pendulum transmission. The actuating element, which includes another electric motor, is structured to change an effective length of the connecting rod in a working connection with the control device.
Advantageously a sensor is arranged at each reversing position of each of the two wiper levers.
An additional sensor may be positioned spaced from one of the sensors at the reversing positions in the wiping direction toward the other reversing position.
The sensors advantageously can be arranged on the windshield but can also be located on the wiper lever.
The sensors are prefer

REFERENCES:
patent: 2732523 (1956-01-01), Schnepf
patent: 2899510 (1959-08-01), Merriam
patent: 3689817 (1972-09-01), Elliott
patent: 4309646 (1982-01-01), Liedtke et al.
patent: 4405887 (1983-09-01), Tamura et al.
patent: 4599546 (1986-07-01), Uemura
patent: 4705997 (1987-11-01), Juzswik
patent: 4707641 (1987-11-01), Guerard et al.
patent: 4768257 (1988-09-01), Brusasco
patent: 4866359 (1989-09-01), Schmid et al.
patent: 5070572 (1991-12-01), Kuhbauch

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