EP0167543A1 - Windscreen wiper device for motor vehicles - Google Patents
Windscreen wiper device for motor vehiclesInfo
- Publication number
- EP0167543A1 EP0167543A1 EP84904101A EP84904101A EP0167543A1 EP 0167543 A1 EP0167543 A1 EP 0167543A1 EP 84904101 A EP84904101 A EP 84904101A EP 84904101 A EP84904101 A EP 84904101A EP 0167543 A1 EP0167543 A1 EP 0167543A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wiper
- wiper blade
- arm
- motor
- control mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- KKEBXNMGHUCPEZ-UHFFFAOYSA-N 4-phenyl-1-(2-sulfanylethyl)imidazolidin-2-one Chemical compound N1C(=O)N(CCS)CC1C1=CC=CC=C1 KKEBXNMGHUCPEZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 230000006978 adaptation Effects 0.000 abstract 1
- 238000007664 blowing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
- B60S1/00—Cleaning of vehicles
- B60S1/02—Cleaning windscreens, windows or optical devices
- B60S1/04—Wipers or the like, e.g. scrapers
- B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
- B60S1/34—Wiper arms; Mountings therefor
- B60S1/3411—Wiper arms; Mountings therefor with means for varying wiper-blade pressure on windshield during operation
Definitions
- the invention relates to a windshield wiper device for motor vehicles of the type specified in the preamble of claim 1.
- the wiper arm is movably mounted on a support member projecting at right angles from a wiper arm drive shaft.
- the wiper blade pressing device has a tension spring which acts on the one hand on the wiper arm and on the other hand on the support member. This tension spring pulls the wiper arm against the vehicle window and thus generates a constant contact force with which the wiper blade is pressed against the vehicle window.
- This windshield wiper device has the disadvantage that the spring force - and thus the wiper blade support force - cannot be optimally adjusted.
- a low spring force is advantageous with regard to the slight deformation of the wiper rubber and the low frictional forces between the wiper blade rubber and the pane, which in turn has an advantageous effect on the design of the wiper motor.
- the wiper blade lifts more or less from the window and the cleaning and water-wiping effect of the wiper blade drops considerably. If, on the other hand, the spring force is relatively large, the last-mentioned effect does not occur to this extent, but then the wiper blade tends to squeak and rub and the wear on the wiper blade rubber is considerable.
- the large frictional forces occurring between the wiper blade rubber and the disc at high spring force also lead to an increased stress on all mechanical and electrical parts of the windshield wiper device, in particular to a heavy load on the wiper motor, so that the life of the windshield wiper device is reduced overall.
- the windshield wiper device according to the invention with the characterizing features of claim 1 has the advantage that the wiper blade contact force is optimally dimensioned in every operating state of the vehicle.
- the wiper blade rests on the windshield with minimal force, which is dimensioned such that on the one hand the wiper rubber is deformed as little as possible and on the other hand that Wiper blade still lies against the windshield during the journey.
- the wiper blade has a nominal contact force which ensures adequate wiping quality.
- this nominal contact force of the wiper blade is increased from a predetermined value of the inflow speed and is set according to a predetermined function as a function of the inflow speed . It is taken into account that there is a risk of overloading the wiper motor if extremely high frictional forces occur between the wiper rubber and the windshield. For this reason, the operating current of the wiper motor is also sensed and, if a predetermined load current is exceeded, the wiper blade contact force is reduced, regardless of the existing inflow velocity, until the predetermined operating current is reached or fallen below again. When the wiper blade contact force is set, priority is given to the load current of the wiper motor over the detected inflow velocity.
- I sT iPO - S ⁇ > i 1 1 is a side view, partly in section, of part of a windshield wiper device for a motor vehicle,
- FIG. 2 shows a schematic illustration of a control mechanism for setting the wiper blade contact force of the windshield wiper device in FIG. 1.
- windshield wiper device has at least one wiper arm 10, the jointed I carries at its end a held wiping sheet 11.
- the wiper arm 10 is held in a joint 12 on a support member 13 which projects essentially at right angles from a wiper arm drive shaft 14 and is rigidly connected to the latter.
- the articulation axis of the articulation 12 is arranged at right angles to the axis of the drive shaft 14, so that the wiper arm 10 is rigidly coupled to the support member 13 with respect to the pivoting movement thereof, is in the direction of the wiper arm drive shaft, that is to say essentially perpendicular to the windshield 38, the motor vehicle is movable.
- the wiper arm drive shaft 14 is rigidly connected to a drive lever 15 which is pivoted by a wiper motor 17 (FIG. 2) over a predetermined pivoting range via a wiper linkage 16.
- a wiper blade pressing device 18 arranged on the support member 13 generates a wiper blade contact force with which the wiper blade 11 rests on the windshield 38 of the vehicle.
- a two-armed lever 19 is pivotally mounted on the support member 13.
- Tension spring 20 the other end of which is attached to the wiper arm 10 t.
- the other lever arm 192 of the two-arm lever 19 is acted against by the restoring force of the tension spring 20 by a control mechanism 21 which, depending on parameters derived from operation, pivots the two-arm lever 19 more or less, thereby causing the tension spring 20 more or less strong and thus adjusts the wiper blade contact force depending on these parameters.
- the parameters here are the on / off of a wiper motor 17 on or off. switching wiper switch 22, the operating current of the wiper motor 17 and the force resulting from the driving speed and wind speed inflow 'into account speed takes into to the windshield 38th
- the control mechanism 21 has an adjusting plunger 23 which is axially displaceable through an axial bore 24 of the wiper arm drive shaft 14 and rests with its end face on the lever arm 192 of the lever 19.
- the setting plunger 23 is guided in a slide bearing 25 of a housing 26 flanged to the lever arm 15 and carries a threaded worm 27 which is driven by a worm wheel 29 driven by an actuator 28 (FIG. 2) is engaged.
- the setting plunger 23 is moved axially forwards or backwards so that the lever 19 is pivoted and thus changes the tensile force of the tension spring 20.
- the servomotor 28 is controlled by a control device 30, which has an actual value transmitter 31 for detecting the actual size of the setting plunger position, a control logic 32 for generating a desired size from the parameters derived from the driving operation and a comparison circuit 33 which compares the actual size with the desired size and controls a switch 34 that turns the actuator 28 on or off in the left or right direction.
- the switch-on always takes place when the actual variable deviates from the target variable and the actuating motor 28 is switched off when the actual and target variable match.
- the actual value transmitter 31 is designed here as a grinding potentiometer 35, which is arranged in the housing 26 and whose grinder 36 is axially immovable on the adjusting plunger 23.
- the control logic 32 is connected to the wiper switch 22 and asks for its entry or exit. In the electrical circuit of the wiper motor 17, a sensor 37 for the operating current I is switched on, which reports the magnitude of the operating current to the control logic 32. Furthermore, the control logic 32 is connected to a Venturi tube 39, which measures the flow velocity v and reports this measured value to the control logic 32.
- the individual sensor data are now linked to one another in such a way that the following criteria are met when the target variable is generated:
- Wiper switch 22 in position "OFF" -r operating current 1 0 (from sensor 37)
- Target voltage is according to a given function according to the size of the inflow velocity. fixed.
- the target voltage representing the target variable is fed to the comparator 33 and compared there with the actual variable of the position of the adjusting plunger 23, which is also taken as electrical voltage.
- the comparison circuit 33 generates a switch-on pulse for the switch 34 which switches the servomotor 28 in the left or right direction, depending on whether the target voltage is greater or less than the actual voltage. As soon as the target voltage and the actual voltage match, the switch-on pulse ceases and the actuator 28 is stopped.
- the minimum target voltage is selected so that the resulting setting of the Push 23 creates a minimal wiper blade contact force via lever 19 and tension spring 20, which: causes as little deformation as possible in the wiper blade / wiper blade 11, but which is just so large that wiper blade 11 is still in contact with windshield 38 while driving.
- the nominal target voltage is specified so that a sufficient wiping quality is ensured by the wiper blade contact force thus achieved.
- the parameter operating current is given priority over the parameter flow velocity, so that whenever the load current of the wiper motor 17 "is exceeded, the contact force of the wiper blade 11 and thus the frictional force between the wiper blade rubber and the windshield 38 is reduced.
- the contact force of more than one wiper blade 11 can also be controlled simultaneously.
- a control mechanism must be provided for each additional wiper blade, and the control device 30 can be common to all control mechanisms.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Direct Current Motors (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Dispositif d'essuie-glace pour véhicules à moteur où, pour une adaptation optimale de la force d'appui de la raclette d'essuie-glace sur le pare-brise (38), un mécanisme de commande (21) pour le réglage de la force d'appui de la raclette d'essuie-glace accroche un dispositif de pression (18) agissant sur la raclette d'essuie-glace (11) en fonction de paramètres découlant du fonctionnement de marche. L'enclenchement et l'arrêt du moteur d'essuie-glace (17), le courant de service (I) du moteur d'essuie-glace (17) et la vitesse de soufflage (v) au pare-brise (38) résultant de la vitesse de marche et de la vitesse du vent sont traités en tant que paramètres de réglage dans un dispositif de réglage (30).Windshield wiper device for motor vehicles in which, for optimal adaptation of the pressing force of the wiper blade on the windshield (38), a control mechanism (21) for adjusting the the pressing force of the wiper blade engages a pressure device (18) acting on the wiper blade (11) depending on parameters arising from running operation. The switching on and off of the wiper motor (17), the operating current (I) of the wiper motor (17) and the blowing speed (v) to the windshield (38) resulting from the walking speed and the wind speed are processed as adjustment parameters in an adjustment device (30).
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3347546 | 1983-12-30 | ||
DE3347546A DE3347546C2 (en) | 1983-12-30 | 1983-12-30 | Windshield wiper device for motor vehicles |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0167543A1 true EP0167543A1 (en) | 1986-01-15 |
Family
ID=6218435
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84904101A Withdrawn EP0167543A1 (en) | 1983-12-30 | 1984-11-10 | Windscreen wiper device for motor vehicles |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0167543A1 (en) |
DE (1) | DE3347546C2 (en) |
IT (1) | IT8424291A0 (en) |
WO (1) | WO1985003044A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0613284B2 (en) * | 1985-01-16 | 1994-02-23 | アイシン精機株式会社 | Wiper device |
JPS6259151A (en) * | 1985-09-06 | 1987-03-14 | Ichikoh Ind Ltd | Wiper device adjustable in pushing pressure |
DE3719874C2 (en) * | 1987-06-13 | 1998-07-09 | Bosch Gmbh Robert | Wiper device for windows of motor vehicles |
DE3834854C2 (en) * | 1988-10-13 | 1998-06-04 | Bayerische Motoren Werke Ag | Windshield wiper system |
DE3912051C2 (en) * | 1989-04-12 | 1996-07-11 | Bayerische Motoren Werke Ag | Windscreen wiper system for a motor vehicle |
DE3923141A1 (en) * | 1989-07-13 | 1991-01-17 | Swf Auto Electric Gmbh | WINDOW WIPER SYSTEM FOR MOTOR VEHICLES |
AT395963B (en) * | 1991-06-18 | 1993-04-26 | Battlogg Stefan | WINDOW WIPER |
FR2685268B1 (en) * | 1991-12-20 | 1994-02-04 | Journee Sa Paul | WINDSCREEN WIPER DEVICE, PARTICULARLY FOR A MOTOR VEHICLE, COMPRISING MEANS FOR DETECTING THE RELATIVE WIND SPEED. |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2824014A1 (en) * | 1978-06-01 | 1979-12-06 | Rau Swf Autozubehoer | WIPER SYSTEM IN VEHICLES |
JPS55160637A (en) * | 1979-05-31 | 1980-12-13 | Mitsuba Denki Seisakusho:Kk | Wiper arm responsive to vehicle speed |
DE3148253C2 (en) * | 1981-12-05 | 1983-10-27 | Bayerische Motoren Werke AG, 8000 München | Wiper arm for windshield wiper systems for motor vehicles |
DE3329573A1 (en) * | 1983-08-16 | 1985-03-07 | SWF Auto-Electric GmbH, 7120 Bietigheim-Bissingen | Windscreen wiper system for motor vehicles |
-
1983
- 1983-12-30 DE DE3347546A patent/DE3347546C2/en not_active Expired - Fee Related
-
1984
- 1984-11-10 WO PCT/DE1984/000239 patent/WO1985003044A1/en unknown
- 1984-11-10 EP EP84904101A patent/EP0167543A1/en not_active Withdrawn
- 1984-12-28 IT IT8424291A patent/IT8424291A0/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO8503044A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3347546A1 (en) | 1985-07-11 |
IT8424291A0 (en) | 1984-12-28 |
DE3347546C2 (en) | 1994-01-13 |
WO1985003044A1 (en) | 1985-07-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19851202 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: DIETRICH, JAN Inventor name: BRUEMMER, DIETMAR Inventor name: KUEHBAUCH, GERD Inventor name: HOKKELBJERG, NIELS Inventor name: KESSLER, PETER-JUERGEN |