Electricity: motive power systems – Motor-reversing
Patent
1999-06-10
2000-09-19
Masih, Karen
Electricity: motive power systems
Motor-reversing
318DIG2, 318443, 318444, 318483, 318445, 318461, 1525017, 307 91, 307 101, H02P 700
Patent
active
061217387
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE TECHNOLOGY
The invention is based on a control device for a windshield wiper, preferably for a front windshield wiper of a motor vehicle, having at least one signal output of a control unit for first control signals to actuate the windshield wiper. It is generally known (e.g. DE-OS-44 23 954) to use an operator element that is mounted to the steering column switch to switch a rear window wiper installed in a motor vehicle, with the operator element permitting the preset functions of, for example, continuous wiping, intermittent wiping or washing. Continuous wiping can be combined to an extent with a fixed time interval to better adapt the wiping rate to the quantity of precipitation on the window and improve the wiping effect. With varying quantities of precipitation, however, the wiping frequency of the rear window wiper rarely meets the driver's needs regarding the wiping effect and good visibility. If the wiping frequency is too low, the driver's visibility is repeatedly impaired by the water layer building up on the rear windshield. If the wiping rate is too high, the wiper blades wear faster from dry-wiping the windshield.
Another drawback, which occurs when the motor vehicle is traveling at high speed in heavy rain, is the road spray that splashes onto the rear window from below. Road spray severely limits the driver's rear visibility, as well as safety.
SUMMARY AND ADVANTAGES OF THE INVENTION
The control device of the invention for a windshield wiper, preferably for a front windshield wiper of a motor vehicle, comprising a control unit having at least one signal output for providing first control signals to actuate the windshield wiper, and a further signal output for further control signals which differ from the first control signals, and with which a further windshield wiper, preferably a rear window wiper of the motor vehicle, can be actuated, has the advantage of automatically actuating the rear window wiper depending on the quantity of precipitation.
It is also known per se to actuate the front windshield wiper with measurement signals obtained by a rain sensor, so the front windshield wiper wipes the front windshield depending on the quantity of precipitation. In this case, the front windshield wiper is automatically controlled in intermittent operation and/or in continuous wiping operation. It would also be possible to operate the rear window wiper with a rain sensor mounted to the rear window; this would not be an economical and simple solution for the rear window wiper, however, because two separate controls with rain sensors would be necessary.
The control device of the invention uses the measurement signals of a rain sensor mounted in the wiping area of the wipers on the front windshield to individually i.e., independently control the front windshield wiper and the rear window wiper.
An advantage of this device is that it simplifies the switching of the steering column switch, because it is possible to operate the front and rear window wipers with a single operator element. This type of simplified switching is more cost-effective.
A further advantage is that the separate control with the second rain sensor for the rear window wiper is omitted, because the rear window wiper is operated by way of a further signal output of the control of the front windshield wiper.
Advantageous modifications and improvements of the features disclosed in the main claim ensue from the measures listed in the dependent claims. One particular advantage is the option of detecting the speed of the motor vehicle and evaluating the signals in the control. For example, the road spray splashing onto the rear window from below can be taken into consideration at high speeds. With further consideration of the vehicle-specific shape, such as the angle of inclination of the rear window, or the shape of the rear of the motor vehicle (notchback, station wagon, etc.), the measurement signals of a rain sensor suffice to automatically switch the front and rear window wipers on and off, varying more or less from
REFERENCES:
patent: 4881019 (1989-11-01), Shiraishi et al.
Patent Abstracts of Japan vol. 010, No. 006 (M-445), Jan. 11, 1986 & JP 60 169356 A (Nissan Jidosha KK), Sep. 2, 1985, see abstract.
Patent Abstracts of Japan vol. 009, No. 319 (M-439), Dec. 14, 1985 & JP 60 154940 A (Fuji Jukogyo KK), Aug. 14, 1985, see abstract.
Patent Abstracts of Japan vol. 009, No. 060 (M-364), Mar. 16, 1985 & JP 59 195454 A (Furukawa Denki Kogyo KK), Nov. 6, 1984, see abstract.
DE 3737653 A May. 24, 1989 FR 2622853 A May 12, 1989.
DE 19505011 A Aug. 22, 1996 WO 9625311 A Aug. 22, 1996.
Blitzke Henry
Burkart Manfred
Meier Hans
Riehl Guenther
Kunitz Norman N.
Masih Karen
Robert & Bosch GmbH
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