WO2009141245A1

WO2009141245A1 - Windscreen washer module for vehicles and wiper motor for use with a windscreen wiper and washer module

Info

Publication number: WO2009141245A1
Application number: PCT/EP2009/055706
Authority: WO
Inventors: Ralf Beuchle
Original assignee: Valeo Systemes D'essuyage
Priority date: 2008-05-20
Filing date: 2009-05-12
Publication date: 2009-11-26
Also published as: DE102008024346A1

Abstract

Windscreen washer module for vehicles, with a supply unit (12) for provision of a washing and cleaning fluid to be emitted onto a vehicle screen (2) and with a sensor unit (17, 18, 27, 20, 21) for acquisition of the respective position or angular position of at least one wiper arm (4) or of a shaft, connected to the wiper arm (4) in the manner of a drive, of a windscreen wiper module (1) for control of the supply unit as a function of the wiping angle.

Description

Windscreen washer module for vehicles and wiper motor for use with a windscreen wiper and washer module

[0001] The invention concern a windscreen washer module for vehicles according to the generic term of patent claim 1 and a wiper motor according to the generic term of patent claim 18.

[0002] Windscreen washer modules for vehicles and specifically in this case for road vehicles and private cars are known in various embodiments and fundamentally consist of a supply unit, which in the activated state, provides the cleaning and washing fluid (water with cleaning and/or antifreeze additives, if appropriate) to be emitted by at least one washer jet onto the vehicle screen, for example the vehicle front windscreen, at the necessary volume flow and pressure. The supply unit generally consists in this case of a container or tank to receive the washing and cleaning fluid and of at least one electrically driven pump (washer pump), the outlet of which is connected via at least one supply line to the at least one washer jet for emission of the washing and cleaning fluid on to the vehicle screen. The windscreen washer module and the supply unit are generally activated and deactivated by switching the pump motor on and off. Also known in particular in this case are supply units with several outlets, for example with two outlets, which are individually controllable, so that depending on different control criteria, emission of the washing and cleaning fluid at different washer jets or groups of washer jets is possible. The at least two outlets are formed in this case of the outlets of a so-called "Bl pump" for example, which on activation of the pump motor for a rotating movement in one direction, supplies the washing and cleaning fluid at one outlet and on activation of the pump motion for an opposite direction of rotation, supplies the washing and cleaning fluid at the other outlet.

[0003] It is also fundamentally known to emit the washing and cleaning fluid and to control the supply unit as a function of the wiping angle, i.e. dependent on the angular position of the wiper arm of the wiper arms of a windscreen wiper module and indeed in such a way that the washing and cleaning fluid is applied during the wiping operation to the area of the vehicle screen that is subsequently swept over by a wiper blade fixed to the wiper arm.

[0004] It has already specifically been proposed to make provision for the washer jets on the wiper arm or on the wiper blade and thus control emission of the washing and cleaning fluid as a function of the wiping angle for example in such a way that during the wiping movement, i.e. during the movement of the wiper arm or the wiper blade between two turning positions of the wiping movement, the cleaning or washing fluid is applied, depending on the direction of the movement of the wiper blade, at least preferably from those washer jets that are provided on the side of the wiper arm or the wiper blade that runs ahead during the respective wiping movement.

[0005] The purpose of the invention is to demonstrate a windscreen washer module which, with a simplified structural design, allows control as a function of the wiping angle of the supply unit for the washing and cleaning fluid with a high degree of operational safety.

[0006] In order to solve this problem, a windscreen washer module according to patent claim 1 is developed. A wiper motor for use with a windscreen washer module is the subject of patent claim 18.

[0007] "Control of the supply unit as a function of the wiping angle" is to be taken to mean very generally in the sense of the invention that the supply unit and provision of the washing and cleaning fluid at the at least one outlet of the supply unit and therefore also at the at least one washer jet connected to this outlet occur depending on the position or angular position of the at least one wiper arm of a windscreen wiper module and depending on the rotational position of the wiper motor corresponding to this position.

[0008] By use of a sensor unit, which consists of the permanent magnet arrangement and the at least one sensor element, which responds to the magnetic field of the magnetic pole pairs of the permanent magnet arrangement, a contract-free and wear-free control of the supply unit for provision of the washing and cleaning fluid as a function of the wiping angle and therefore a high level of operational safety is achieved. [0009] The at least one sensor element is preferably a Hall sensor, by means of which activation and deactivation of the supply unit is possible owing to the different polarity of the magnetic pole pairs acting in conjunction with the Hall sensor and to be more precise with control electronics that only require an extremely limited number of components and can therefore be realised very cheaply and with a small constructional volume. In particular, the embodiment according to the invention makes it possible to easily integrate the components of the sensor unit and the corresponding electronics into wiper motors of already existing design and namely also particularly with simplified assembly, all the more so since a spatial distance is possible between the permanent magnet arrangement provided for example on the motor shaft or the output shaft of the wiper motor or on a wheel arranged on this shaft and the at least one sensor element, for example a Hall sensor, without the functionality of the sensor unit being impaired as a result.

[0010] The at least one sensor element, owing to the polarity of the one magnetic pole pair of the permanent magnet arrangement, causes activation of the supply unit and owing to the opposite polarity of the magnetic pole pair, deactivation of the supply unit.

[0011] By use of at least two sensor elements, it is possible to control the supply unit not only as a function of the wiping angle, i.e. depending on the angular position, but also as a function of the wiping direction, i.e. depending on the direction of movement of the wiper arm and the wiper blade and namely in such a way for example that in both directions of the pivoting movement of the wiper arm and the wiper blade, the washing and cleaning fluid is always applied to the vehicle screen ahead of the wiper blade.

[0012] Further developments, advantages and application possibilities of the invention are also apparent from the following description of examples of embodiment and from the figures. In this case, all the characteristics described and/or illustrated are in themselves or in any desired combination fundamentally a subject of the invention, regardless of their summary in the claims or their backward relation. The contents of the claims are also made an integral part of the description.

[0013] The invention is described below in further detail in an example of embodiment based on the figures.

[0014] Fig. 1 shows a very simplified schematic partial presentation of a windscreen washer module for the front windscreen of a road vehicle, for example a private car, together with a windscreen wiper module for emission of a washing and cleaning fluid as a function of the wiping angle onto the vehicle screen;

[0015] Fig. 2 shows a cam disc in addition to a corresponding PCB presenting two Hall sensors of control electronics for control as a function of the wiping angle of a BI pump (washer pump) of the windscreen washer module in figure 1 ;

[0016] Fig. 3 shows a simplified presentation of a block or functional diagram of the control electronics;

[0017] Fig. 4 - 9 shows the position of the cam disc in relation to the PCB of the control electronics and to the Hall sensors in different wiping angle positions;

[0018] Fig. 10 shows a presentation as in figure 2 with a further embodiment of the invention

[0019] In the figures, 1 is a windscreen wiper module for a vehicle front windscreen 2, for a sloped front screen of a private car for example. Elements of this wiper module illustrated include among others the wiper arm 4 and wiper blade pivotable around the axis of a wiper shaft 3 in addition to an electric wiper motor 6 designed as a geared motor, which when the windscreen wiper module is switched on, causes pivoting of the wiper arm 4 between a parked position PP or a turning position WP1 adjacent to the latter and a turning position WP2 and which is connected to the wiper arm for this purpose in the manner of a drive via a crank mechanism. The crank mechanism is only schematically implied in figure 1 by the crank 7 provided on the motor shaft or output shaft 6.1 of the wiper motor, by the crank 8 provided on the wiper shaft 3 and by the coupling element 9 connecting the two cranks. The wiper motor 6 is designed for rotary running, i.e. the crank 7 rotates continuously in the direction of the arrow A with the windscreen wiper module 1 switched on and during wiping operation.

[0020] The windscreen wiper module 1 is furthermore equipped with a windscreen washer module, which namely essentially consists of a tank 10 to receive a washing and cleaning fluid, for example water with cleaning and/or antifreeze additives, if appropriate, and of a pump 11 with an electric motor 11a (figure 3). The tank 10, pump 11 and electric motor 11a together form a supply unit 12 for supply of the washing and cleaning fluid. The pump 11 is designed as a BI pump, i.e. with a pump inlet 11.1 leading to the tank 10 and with two pump outlets 11.2 and 11.3. Changing the direction of rotation of the electric motor 11a controls supply of the washing and cleaning fluid with the necessary volume flow and pressure at either outlet 11.2 or outlet 11.3.

[0021] In the embodiment presented, the wiper blade 5 is equipped with several washer jets for the washing and cleaning fluid on both its long sides and therefore also on both sides of the conventional wiping lip lying against the vehicle screen 2, which form a group 13 and 14 of washer jets on each long side of the wiper blade. Each group 13 and 14 is connected via at least partially flexible hose lines to a pump outlet 11.2 and 11.3 and namely all washer jets of group 13 to the pump outlet 11.2 and all washer jets of group 14 to the pump outlet 11.3. By means of control electronics 15, the electric motor 11a is controlled in the manner described in further detail below synchronously with the rotating movement of the wiper motor 6 as a function of the wiping angle so that with the windscreen wiper module 1 switched on and with the windscreen washer module switched on during the pivoting movement of the wiper arm 4 and therefore the wiper blade 5 from the turning position WP1 in the direction of the turning position WP2 , the washing fluid is emitted onto the vehicle screen 2 exclusively from the washer jets of the group 13 running ahead of this pivoting movement and conversely during the pivoting movement of the wiper arm 4 and therefore the wiper blade 5 from the turning position WP2 to the turning position WP1 or to the parked position PP, exclusively from the washer jets of the group 14 running ahead of this movement.

[0022] A cam disc 16 is provided on the output shaft 6.1 of the wiper motor 6 for this control as a function of the wiping angle of the electric motor 11a and therefore the pump 11 , on which (cam disc) in the embodiment presented two permanent magnets 17 and 18 are arranged offset by an first degree of angle, for example by an angle of 90° or at approximately 90° in relation to one another and namely in the embodiment presented in such a way that the connecting line between the poles N and S (north pole and south pole) of each permanent magnet 17 and 18 is oriented approximately parallel to the tangent on the circumference of the disc-shaped cam disc 16, i.e. the magnetic field lines also run between the respective pole pair S/N on at least one side of the cam disc 16 in the direction of the circumference of this cam disc. Furthermore, the two permanent magnets 17 and 18 have reverse polarity on the cam disc 16 and indeed in such a way that in the embodiment presented, the north pole N of the permanent magnet 17 runs ahead of the corresponding south pole S in an assumed circumferential direction of the cam disc 16, for example in the direction of rotation A, whereas in case of the permanent magnet 18 the south pole S runs ahead of the north pole N in the assumed circumferential direction.

[0023] The cam disc 16 is for example an additional cam disc arranged on the output shaft 6.1 of the wiper motor 6 and rotating with this output shaft or a gear wheel arranged on the output shaft 6.1 is preferably used as the cam disc, for example the worm wheel of a worm gear of the wiper motor 6 acting in conjunction with a worm on the armature shaft of the electric motor.

[0024] On a PCB 19 of the electronics 15, Two Hall sensors 20 and 21 are allocated to the two permanent magnets 17 and 18, which (Hall sensors) in the embodiment presented are provided offset in relation to one another by a second degree of angle which is larger than the first degree of angle and corresponds to approximately twice the first degree of angle, i.e. by approximately 180° around the axis of the output shaft 6.1 and of the cam disc 16 and namely in the same radial distance from this axis as that of the two permanent magnets 17 and 18. The Hall sensors 20 and 21 are designed for example as bistable sensors or a sensor element such that they are controllable between an activated and deactivated status by applying a magnetic field of different polarity and the respective status is maintained until further triggering. Illustrated among other aspects is the electric motor 11a, which is connectable by its two connections 11a.1 and 11a.2 via two relays 22 and 23 either to the switching earth (negative pole) of the vehicle on-board power supply or to a connection 24 connected to the positive pole of the vehicle on-board power supply. The two relays 22 and 23 are designed in such a way in the embodiment presented that each relay contact connected to the motor connection 11a.1 and 11 a.2 is connected in the neutral status with the vehicle earth. The relays 22 and 23 are each triggered respectively via the output of a driving stage 25 designed as an integrated switching circuit, the inputs of which (driving stage) are respectively connected to one of the two Hall sensors 20 and 21. On activation of the Hall sensor 20, the relay 22 is activated via the driving stage 25 and thereby the motor connection 11a.1 is connected to the positive pole of the supply network and to be more precise for a direction of rotation of the motor 11a therefore of the pump 11 in such a way that the pump 11 supplies the washing and cleaning fluid at its outlet 11.2. On activation of the Hall sensor 21 , the relay 23 is activated via the driving stage, so that the connection 11a.2 is subsequently connected to the positive pole of the on-board power supply and consequently the pump 11 is driven by the motor 11a in a direction of rotation for supply of the washing fluid at the pump outlet 11.3.

[0025] Figures 4 - 9 show the interaction of the permanent magnets 17 and 18 with the Hall sensors 20 and 21 and the control of switching on and off of the motor 11a and the pump 11 thereby achieved, in addition to control of the direction of rotation of the motor 11 a and the driven pump 11.

[0026] When the windscreen wiper module 1 is not activated and when the wiper arm 4 is located in the parked position PP, both Hall sensors 20 and 21 are arranged outside the effective area of the permanent magnets 17 and 18 and are inactive. The pump 11 is not driven by the electric motor 11a. This status is illustrated in figure 4. The output shaft 6.1 and the crank 7 are in their initial position.

[0027] After switching on the windscreen wiper module and the wiper motor 6, the output shaft 6.1 and together with the latter the cam disc 16 are driven in rotation in the direction of the arrow A, so that after an initial angular area of the rotating movement of the output shaft 6.1 , i.e. after an angle of rotation of approx. 11° in the embodiment presented, the hall sensor 20 is activated by the permanent magnet 17 and consequently the pump 11 is activated via the switched relay 22 for supply of the cleaning fluid at the pump outlet 11.2 and for dispensing of the washing and cleaning fluid to the washer jets of the group 13. This status is illustrated in figure 5 and is maintained until with a further angular rotation of the output shaft 6.1 and the crank 7 of approx. 89°, i.e. after an angle of rotation of a total of 100° from the original initial position, the Hall sensor 20 arrives in the range of action of the permanent magnet 18, which has opposite polarity to the permanent magnet 17 and which consequently causes deactivation of the Hall sensor 20 and thereby deactivation of the relay 22 and switching off of the motor 11a. This status, which lies approximately in the middle of the wiping field formed between the turning positions WP1 and WP2, is illustrated in figure 6.

[0028] Following a further angular rotation of the output shaft 6.1 and the crank 7 through approximately 80°, i.e. at an angular position of 180° in relation to the initial position, the Hall sensor 21 arrives in the range of action of the permanent magnet 17 and is thereby activated, so that the pump 11 is driven via the activated relay 23 for supply of the washing and cleaning fluid at the pump outlet 11.3 and namely for dispensing of the washing and cleaning fluid onto the vehicle screen 2 through the washer jets of the group 14. This status illustrated in figure 7 corresponds to the pivoting movement of the wiper arm 4 on leaving the turning position WP2 or directly or after leaving this turning position. This status is maintained until following a further angular rotation of the output shaft 6.1 and the cam disc 16, the status illustrated in figure 8 is achieved, in which the Hall sensor 21 arrives in the range of action of the permanent magnet 18 and is deactivated by the latter, so that through deactivation of the relay 23, the motor 11a and therefore the pump 11 are switched off. The status illustrated in figure 8 is achieved following an angle of rotation of the output shaft 6.1 of approximately 270° from the initial position. Following a further rotating movement of the output shaft 6.1 , i.e. after an angle of rotation of a total of 360°, the initial position corresponding to the turning position WP1 or the parked position PP of the wiper arm 4 is in turn achieved according to figure 9.

[0029] A particular advantage of the windscreen wiper module 1 and the windscreen washer module lies among other aspects in optimum washer pump control as a function of the wiping angle in such a way that the washing and cleaning fluid is applied to the vehicle screen 2 in each case ahead of the wiping movement of the wiper blade 5. A considerable advantage also lies in the fact that control is performed on a contact-free basis by means of the permanent magnets 17 and 18 and the Hall sensors 20 and 21 ; sliding contacts susceptible to faults and subject to wear, corresponding contact segments etc. on the cam disc 16 and other mechanical contacts are avoided. The embodiment according to the invention furthermore have the advantage that the sensor unit consisting of the permanent magnets 17 and 18 and of the Hall sensors 20 and 21 , including the electronics 15 can be integrated without difficulty in already developed wiper motors. The entire control system is also extremely economical to produce, since it only consists of a few components, that is to say, the two Hall sensors 20 and 21 , the driving stage 25, the two relays 22 and 23 and if appropriate also interference suppression and protection components. Furthermore, in particular installation of the PCB 19 bearing the Hall sensors and the electronics 15 in the housing of the wiper motor 6, for example in the gear housing or gear cover of this motor is unproblematic, all the more so since the distance between the Hall sensors 20 and 21 and the permanent magnets 17 and 18 may be several millimetres wide with perfect control.

[0030] It was assumed above that a cam disc 16 with the two permanent magnets 17 and 18 is provided on the output shaft 6.1 , wherein the cam disc 16 is preferably formed by the gear wheel of the worm gear of the wiper motor 6. An embodiment is presented in figure 10 in which, on the output shaft 6.1 of the wiper motor 6, a two-pole round magnet 27 is arranged adjacent to the gear wheel 26 at this position, which (magnet) forms a south pole S on a smaller section of its ring segment and a north pole N on the larger section of its ring segment, so that two magnetic gaps or pole pairs between magnetic field lines running between a north pole and a south pole are retained. The magnetic gaps 28 and 29 correspond in their function to the pole pairs of the permanent magnets 17 and 18 and are also offset in relation to one another by the same angular interval as that which the permanent magnets 17 and 18 present in relation to one another. The two-pole round magnet 27 and its magnetic gaps 28 and 29 interact in the same manner as described for the permanent magnets 17 and 18 with the Hall sensors 20 and 21 for control of the washer pump 11 as a function of the wiping angle.

[0031] The invention is described above based on an example of embodiment. It is understood that modifications and variations are possible without departing as a result from concept on which the invention is based. It was therefore assumed above that the Hall sensors 20 and 21 are designed as bistable Hall sensors in such a way that following activation, they respectively maintain the activated status at their output until deactivation occurs. It is of course also possible to relocate this bistable function in other components or subassemblies of the electronics 15.

[0032] Furthermore, it was also assumed above that the washer jets for emission of the washing and cleaning fluid are provided on the wiper blade 5 and on the latter's long sides. Other embodiments are of course possible, in which for the wiper arm 4 presents these washer jets for example.

[0033] Furthermore, it is also possible to control by means of the electronics 15, as a function of the wiping angle, other functional elements for emission of the washing and cleaning fluid instead of the pump 11 , for example valves and/or further washer jets for emission of the washing and cleaning fluid in addition to the washer jets provided on the wiper arm 4 or on the wiper blade 5, for example washer jets provided on the vehicle bodywork and not moved with the wiper arm. Furthermore, it was assumed above that the two poles N and S of the permanent magnets 17 and 18 are respectively offset in relation to one another in the circumferential direction of the cam disc 16. It is also fundamentally possible to provide the permanent magnets 17 and 18 on the cam disc in a different manner or on a gear wheel and namely in such a way that the polarity of these permanent magnets is respectively reversed.

Claims

1. Windscreen washer module for vehicles, with a supply unit (12) for provision of a washing and cleaning fluid to the emitted onto a vehicle screen (2) and with a sensor unit (17, 18, 27; 20, 21) for acquisition of the respective position or angular position of at least one wiper arm (4) or of a shaft (6.1 ), connected to the wiper arm (4) in the manner of a drive, of a windscreen wiper module (1) for control of the supply unit (12) as a function of the wiping angle, characterised in that the sensor unit consists of a permanent magnet arrangement (17, 18, 27) that presents at least one magnetic pole pair (S/N) for creation of a magnetic field and of at least one magnetically controllable sensor element (20, 21) acting in conjunction with the permanent magnet arrangement (17, 18, 27) and that the permanent magnet arrangement (17, 18, 27) and the at least one sensor element (20, 21) are provided to be movable or pivotable relation to one another depending on the position or angular position of the at least one wiper arm (4) or of the shaft (6.1 ).

2. Windscreen washer module according to claim 1 , characterised in that at least one sensor element responding to a magnetic field is a Hall sensor (20, 21).

3. Windscreen washer module according to claim 1 or 2, characterised in that the permanent magnet arrangement (17, 18, 27) is provided on an element (16) connectable in the manner of a drive to the wiper arm (4) or on the shaft (6.1 ) or on a disc or a wheel (16) on this shaft (6.1).

4. Windscreen washer module according to one of the above claims, characterised in that the permanent magnet arrangement (17, 18, 27) forms at least two magnetic pole pairs (S/N) interacting with the sensor element (20, 21) with magnetic field lines running respectively between these magnetic pole pairs and that the magnetic pole pairs have reverse polarity.

5. Windscreen washer module according to one of the above claims, characterised in that the pole (N, S) of the at least one magnetic pole pair (S/N) are offset in relation to one another in the direction of the relative movement.

6. Windscreen washer module according to one of the above claims, characterised in that at least one magnetic pole pair (S/N) of the permanent magnet arrangement is formed of a permanent magnet (17, 18, 27).

7. Windscreen washer module according to one of the above claims, characterised in that the permanent magnet arrangement is formed of at least one annular or basic magnet (27), which is of at least two-pole execution for formation of at least two magnetic pole pairs with reverse polarity.

8. Windscreen washer module according to one of the above claims, characterised in that the at least two magnetic pole pairs of the permanent magnet arrangement (17, 18, 27) are provided offset in relation to one another around the axis of the relative movement by an first degree of angle, for example by an first degree of angle of approx. 90°.

9. Windscreen washer module according to one of the above claims, characterised in that at least two sensor elements (20, 21) are provided offset in relation to one another around the axis of the relative movement by a second degree of angle, for example by a second degree of angle which is larger than the first degree of angle, for example by a second degree of angle of approx. 180°.

10. Windscreen washer module according to one of the above claims, characterised in that the at least one sensor element (20, 21) is provided on a PCB (19) set at a distance from the permanent magnet arrangement (17, 18, 27) and in or on a housing of the wiper motor (6).

11. Windscreen washer module according to one of the above claims, characterised in that the relative movement between the permanent magnet arrangement (17, 18, 27) and the at least one sensor element (20, 21) corresponds to a pivoting of the wiper arm (4) between two turning positions (WP1 , WP2) and that the supply unit (12) controlled by the at least one sensor element (20, 21) is thereby activated for dispensing of the washing and cleaning fluid as a function of the wiping angle and/or wiping direction.

12. Windscreen washer module according to claim 11 , characterised in that activation of the supply unit (12) by the sensor unit respectively occurs after leaving a turning position (WP1 , WP2) with a time lag or after a movement step or angular step causing this time lag.

13. Windscreen washer module according to one of the above claims, characterised in that at least one sensor element (20, 21) is an integral component of control electronics (15) for triggering of the supply unit (12).

14. Windscreen washer module according to one of the above claims, characterised in that the supply unit (12) has at least two outlets (11.2, 11.3) for dispensing the washing and cleaning fluid and that one sensor element (20) controls dispensing of the washing and cleaning fluid as a function of the wiping angle at one outlet (11.2) and another sensor element (21) controls dispensing of the washing and cleaning fluid at the other outlet (11.3).

15. Windscreen washer module according to one of the above claims, characterised in that the supply unit (12) has at least one pump (11) controlled by the sensor unit (17, 18, 27; 20, 21).

16. Windscreen washer module according to one of the above claims, characterised in that both outlets (11.2, 11.3) of the supply unit are formed by the outlets of a BI pump (11), which in one direction of rotation of the pump supplies the washing and cleaning fluid at one outlet (11.2) and in the opposite direction of rotation of the pump supplies the washing and cleaning fluid at the other outlet (11.3).

17. Windscreen washer module according to claim 16, characterised in that the pump (11) presents a pump motor (11a) which is reversible in its direction of rotation by modifying the polarity of a DC supply voltage and that the pump motor (11a) with its electrical connections (11a.1 , 11a.2) is connectable via an electrically operatable switching element (22, 23) respectively depending on the signals of the sensor unit (17, 18, 27; 20, 21) with each connection (11a.1 , 11 a.2) to the negative pole or the positive pole of the DC supply voltage and namely for changing over the direction of rotation of the pump motor (11a) and therefore the direction of rotation of the pump.

18. Wiper motor for windscreen wiper modules for vehicles with a windscreen washer module, with a sensor unit (17, 18, 27; 20, 21) for acquisition of the respective position or angular position of a shaft (6.1 ) of the wiper motor (6) for control of a supply unit (12) as a function of the wiping angle for a washing and cleaning fluid of the windscreen washer module, characterised in that the sensor unit consists of a permanent magnet arrangement (17, 18, 27) that presents at least one magnetic pole pair (S/N) for creation of a magnetic field and of at least one magnetically controllable sensor element (20, 21) acting in conjunction with the permanent magnet arrangement (17, 18, 27) and that the permanent magnet arrangement (17, 18, 27) and the at least one sensor element (20, 21) are provided to be movable or pivotable relation to one another depending on the position or angular position of the shaft (6.1).

19. Wiper motor according to claim 18, characterised in that the at least one sensor element responding to a magnetic field is a Hall sensor (20, 21).

20. Wiper motor according to claim 18 or 19, characterised in that the permanent magnet arrangement (17, 18, 27) is provided on the shaft (6.1) or on a disc or a wheel (16) on this shaft.

21. Wiper motor according to one of the above claims, characterised in that the shaft is the output shaft (6.1 ) of the wiper motor (6).

22. Wiper motor according to one of the above claims, characterised in that characterised in that the permanent magnet arrangement (17, 18, 27) forms at least two magnetic pole pairs (S/N) interacting with the sensor element (20, 21) with magnetic field lines running respectively between these magnetic pole pairs and that the magnetic pole pairs have reverse polarity.

23. Wiper motor according to one of the above claims, characterised in that the poles (N, S) of the at least one magnetic pole pair (S/N) are offset in relation to one another in the direction of the relative movement.

24. Wiper motor according to one of the above claims, characterised in that the at least one magnetic pole pair (S/N) of the permanent magnet arrangement is formed of a permanent magnet (17, 18, 27).

25. Wiper motor according to one of the above claims, characterised in that the permanent magnet arrangement is formed of at least one annular or basic magnet (27), which is of at least two-pole execution for formation of at least two magnetic pole pairs with reverse polarity.

26. Wiper motor according to one of the above claims, characterised in that the at least two magnetic pole pairs of the permanent magnet arrangement (17, 18, 27) are provided offset in relation to one another around the axis of the relative movement by an first degree of angle, for example by an first degree of angle of approx. 90°.

27. Wiper motor according to one of the above claims, characterised in that at least two sensor elements (20, 21) are provided offset in relation to one another around the axis of the relative movement by a second degree of angle, for example by a second degree of angle which is larger than the first degree of angle, for example by a second degree of angle of approx. 180°.

28. Wiper motor according to one of the above claims, characterised in that the at least one sensor element (20, 21) is provided on a PCB (19) set at a distance from the permanent magnet arrangement (17, 18, 27) and in or on a housing of the wiper motor (6).

29. Wiper motor according to one of the above claims, characterised in that the relative movement between the permanent magnet arrangement (17, 18, 27) and the at least one sensor element (20, 21) corresponds to a pivoting of the wiper arm (4) between two turning positions (WP1 , WP2) and that the supply unit (12) controlled by the at least one sensor element (20, 21) is thereby activated for dispensing of the washing and cleaning fluid as a function of the wiping angle and/or wiping direction.

30. Wiper motor according to claim 29, characterised in that the sensor elements (20, 21) are provided in relation to one another and/or in relation to the permanent magnet arrangement (17, 18, 27) such that activation of the supply unit (12) by the sensor unit respectively occurs after leaving a turning position (WP1 , WP2) with a time lag or after a movement step or angular step causing this time lag.

31. Wiper motor according to one of the above claims, characterised in that at least one sensor element (20, 21) is an integral component of control electronics (15) for triggering of the supply unit (12).

32. Wiper motor according to one of the above claims, characterised in that control electronics (15) have two connections for a pump motor (11a) and that these connections are connectable to a negative or a positive pole of a DC voltage supply for modifying the polarity of the voltage applied to the connections by means of an electrically operatable switching element (22, 23) respectively depending on the signals of the sensor unit (17, 18, 27; 20, 21).