FR3138391A1 - Wiping system with selective injection assembly of cleaning fluid in three longitudinal channels - Google Patents

Abstract

Title: Wiping system with selective injection assembly of cleaning fluid in three longitudinal channels The present invention relates to a wiping system for a motor vehicle comprising an arm (103) and a wiping blade configured to wipe an area of visibility of a windshield and capable of being driven by the arm and comprising three longitudinal channels, with a first nozzle element in fluid communication with the first channel and configured to project cleaning fluid, a second nozzle element in fluid communication with the second channel and configured to project cleaning fluid, and a third nozzle element in fluid communication with the third channel and arranged at a longitudinal end zone of the wiper blade. An injection assembly is capable of selectively injecting a cleaning fluid into the first longitudinal channel, the second longitudinal channel and/or the third longitudinal channel. (figure 3)

Description

Wiping system with selective injection assembly of cleaning fluid in three longitudinal channels

The present invention relates to a wiping system, in particular for a motor vehicle, and in particular the selective injection of cleaning fluid into longitudinal channels of such a system.

It is known in the field of wiping systems for glass surfaces, in particular for the windshield or rear window of a motor vehicle, to provide longitudinal channels in a wiping blade in order to project cleaning fluid in front of the wiper blade on a glass surface of the vehicle, in order to allow cleaning of the window.

Wiping systems with two longitudinal channels are known, one being dedicated to a projection of cleaning fluid in front of the broom in a first sweeping direction, and the other being dedicated to a projection of cleaning fluid in front of the broom in a second sweeping direction.

Automotive vehicles include more and more sensors, most of which have an optical surface. It is necessary to clean such an optical surface in order to improve the quality of the acquired data.

However, it is expensive and cumbersome to provide a dedicated cleaning system for each of the vehicle's sensors.

There is thus a need to allow the cleaning of glass or optical surfaces of a vehicle, without increasing the number of cleaning systems, while simplifying the wiping system to reduce its cost and its size, and while optimizing the use of cleaning fluid.

The present invention relates to a wiping system for a motor vehicle comprising:

- an arm ;

- a motor capable of driving the arm in rotation;

- a wiper blade configured to wipe a visibility zone of a windshield of the vehicle and capable of being driven by the arm and comprising a first longitudinal channel, a second longitudinal channel and a third longitudinal channel, at least a first nozzle element, in fluid communication with the first longitudinal channel and configured to project cleaning fluid, at least one second nozzle element in fluid communication with the second longitudinal channel and configured to project cleaning fluid, at least one third nozzle element in fluid communication with the third longitudinal channel and configured to project cleaning fluid, said third nozzle element being arranged at a longitudinal end of the wiping blade;

- an injection assembly capable of selectively injecting a cleaning fluid into the first longitudinal channel, the second longitudinal channel and/or the third longitudinal channel.

It is thus made possible to use the same wiping system for several distinct cleaning functions or to carry out complementary functions. In particular, the wiping system can clean the visibility zone that the wiping system sweeps, and another optical surface, such as the optical surface of a motor vehicle sensor located outside the visibility zone for example . A visibility zone is a part of the windshield arranged facing a driver or passenger of the vehicle, and through which the passenger or driver can observe the environment outside the vehicle. In addition, a single injection assembly is responsible for selective injection into the different longitudinal channels, which simplifies the wiping system and optimizes the use of cleaning fluid.

According to one embodiment, said at least one first nozzle element may be capable of projecting cleaning fluid in a first direction, said at least one first nozzle element may be capable of projecting cleaning fluid in a second direction, and said at least a third nozzle element may be capable of projecting cleaning fluid in a third direction, the first, second and third directions being distinct.

Thus, the three longitudinal channels can be dedicated to three distinct and/or complementary functions, for example the cleaning of three different surfaces, including two sensor surfaces and the visibility zone swept by the wiping system, or the cleaning of a sensor and the visibility zone with a differentiated projection according to a scanning direction of the wiping system. Still alternatively, all the nozzle elements, including the third nozzle element(s) can project cleaning fluid onto the windshield which is swept by the wiper blade.

According to one embodiment of the invention, the first direction and the second direction can be inclined relative to, or transverse to, a longitudinal direction of the wiper blade. In particular, the first and second directions can be oriented towards the glass surface swept by the wiper blade, so as to improve cleaning of the glass surface. The first and second directions may in particular correspond respectively to different sweeping directions of the wiping blade, which makes it possible to improve the efficiency associated with cleaning the glass surface swept by the wiping system. The first and second directions may be normal to the longitudinal direction of the blade, or may form a small angle, less than 20°, with a normal to the longitudinal direction of the blade.

According to one embodiment of the invention, the injection assembly may comprise a first pump connected to the first longitudinal channel by a first injection channel, a second pump connected to the second longitudinal channel by a second injection channel and a third pump connected to the third longitudinal channel by a third injection channel.

Such an embodiment makes it possible to control each of the pumps independently. It is thus possible to inject cleaning fluid at different pressure levels into each of the pumps.

Alternatively, the injection assembly may comprise a first dual-pressure pump capable of injecting cleaning fluid into a first injection channel according to at least a first pressure level or a second pressure level, and a valve to pressure differential connecting the injection channel to the first longitudinal channel or to the second longitudinal channel depending on whether the fluid is injected with the first pressure level or the second pressure level in the injection channel.

It is thus made possible to reduce the number of pumps in the injection assembly by pooling a pump for injection into the first and second longitudinal channels. What is more, in certain embodiments, it is not necessary to inject fluid into these two channels at the same time since they can be dedicated to distinct scanning directions. The size and cost associated with the system are thus reduced.

In addition, the injection assembly may further comprise a second pump capable of injecting cleaning fluid into a second injection channel connected to the third longitudinal channel.

The injection into the third longitudinal channel is thus independent of that into the other two longitudinal channels. Only two pumps are thus used in the injection system, while allowing selective injection into the longitudinal channels.

Alternatively, the first pump is a dual-pressure, bidirectional pump capable of selectively injecting cleaning fluid into the first injection channel or into a second injection channel connected to the third longitudinal channel, depending on a direction of flow. rotation of a pump motor of the first pump.

Thus, a single pump is used for injection into the three longitudinal channels, which considerably reduces the bulk associated with the system, while allowing selective injection.

Still as a variant, the first pump can be connected to a solenoid valve via a single channel, the solenoid valve being able to transmit the cleaning fluid injected by the first pump into the single channel, towards the first injection channel or towards a second injection channel connected to the third longitudinal channel, depending on control signals received from a control unit.

Again, a single pump is used for injection into the three longitudinal channels, which considerably reduces the bulk associated with the system, while allowing selective injection.

Alternatively, the injection assembly may comprise a first bidirectional pump, the first pump being connected to the first longitudinal channel by a first injection channel and being connected to the second longitudinal channel by a second injection channel, the first pump being capable of injecting cleaning fluid into the first injection channel or into the second injection channel depending on a direction of rotation of a pump motor of the first pump. The injection system may further comprise a second pump connected to the third longitudinal channel by a third injection channel.

It is thus possible to reduce the number of pumps to two pumps, while allowing selective injection of the cleaning fluid between the three longitudinal channels.

Other characteristics and advantages of the invention will appear further through the description which follows on the one hand, and several examples of embodiment given for informational and non-limiting purposes with reference to the appended schematic drawings on the other hand, in which :

there illustrates elements of a wiping system according to one embodiment of the invention;

there is a cross-sectional view of a wiping blade of a wiping system according to one embodiment of the invention;

there illustrates a wiping system according to the invention, mounted on a motor vehicle windshield;

there illustrates an injection assembly of a wiping system according to a first embodiment of the invention;

there illustrates an injection assembly of a wiping system according to a second embodiment of the invention;

there illustrates an injection assembly of a wiping system according to a third embodiment of the invention;

there illustrates an injection assembly of a wiping system according to a fourth embodiment of the invention;

there illustrates an injection assembly of a wiping system according to a fifth embodiment of the invention;

there illustrates a method of controlling the injection of cleaning fluid into a wiping system according to one embodiment of the invention.

It should first be noted that if the figures present the invention in detail for its implementation, they can of course be used to better define the invention if necessary. It should also be noted that, in all the figures, similar elements and/or fulfilling the same function are indicated by the same numbering.

There illustrates elements of a wiping system 100 for a motor vehicle according to one embodiment of the invention. The wiping system is suitable for being installed on a glass surface of a vehicle, preferably a windshield or a rear window.

The wiping system comprises at least one arm 103, a wiping blade 105 attached to the arm by a fixing device 104 and configured to wipe a visibility zone of a windshield of the vehicle, and a drive device 101 of arm 103.

The drive device 101 is configured to set the wiper blade 104 in motion via the arm 103, the wiper blade 105 being in contact with the visibility zone. The movement of the arm 103 is typically a back and forth movement, preferably a circular movement. For this purpose, the drive device 101 can itself be moved by a motor around a pivot connection 101 making it possible to achieve the circular movement of the wiping system 100.

No restriction is attached to the fixing device 104 which is capable of allowing the mechanical fixing of the wiper blade 105 to the arm 103. The mechanical fixing can in particular be by tightening, by nesting, or by any other means. No restriction is attached to the degrees of freedom permitted by the mechanical connection produced by the fixing device 104.

The wiping system 100 according to the invention further comprises an assembly for injecting a cleaning fluid from a reservoir, not shown on the , but described later, towards the arm 103, then towards the wiping blade 105, in order to selectively distribute the cleaning fluid:

- in a first longitudinal channel in fluid communication with first nozzle elements 111 capable of projecting or dispersing cleaning fluid;

- in a second longitudinal channel in fluid communication with second nozzle elements 112 capable of projecting or dispersing cleaning fluid;

- in a third longitudinal channel in fluid communication with at least a third nozzle element 113 capable of projecting or dispersing cleaning fluid and arranged in a longitudinal end zone of the wiper blade. By longitudinal end zone we mean a zone whose set of positions are closer to the longitudinal end of the wiper blade than to a central position of the wiper blade. The central position may in particular correspond to the position of the fixing device 104 between the wiping blade 103 and the arm 105 of the wiping system. Preferably, the longitudinal end zone includes all the positions twice as close, or even three times as close, to the longitudinal end as to the central position of the wiper blade.

No restriction is attached to the structure of such sprinkler elements, which are well known to those skilled in the art.

According to the invention, the nozzle elements are all arranged in the wiper blade 105.

Each of the first, second and third nozzle elements can thus perform different and/or complementary cleaning functions, within the same wiping blade of a wiping system.

For example, the third nozzle element disposed in the longitudinal end zone may be capable of projecting cleaning fluid onto a surface of a sensor located outside the visibility zone of the windshield, such as a Lidar, such as it will be better understood after reading what follows. Alternatively, the third nozzle element can project cleaning fluid onto the windshield visibility zone which is swept by the wiper blade 105.

The first spray element(s) may be capable of projecting cleaning fluid onto the visibility zone swept by the brush 105 of the wiping system, so as to improve the cleaning of such a zone. The second nozzle element(s) may also be capable of projecting cleaning fluid onto the visibility zone, in a manner complementary to the first nozzle elements, in order to improve the efficiency of wiping, or may be dedicated to cleaning a sensor other than that targeted by the third spray element(s).

The first, second and third nozzle elements can in particular project cleaning fluid in three distinct directions, called respectively first, second and third directions. It is thus made possible to carry out several cleaning functions or to carry out complementary functions.

In what follows, it is considered, for illustration purposes only, that the first and second nozzle elements 111 and 112 project towards the same glazed surface swept by the broom 105, and that the third nozzle element 113 is capable of projecting towards a surface optics of a sensor, such as a Lidar. The scanned glass surface corresponds to the visibility zone and is distinct from the optical surface of the sensor.

For this purpose, it is notably considered that the nozzle elements 111 and 112 project in two distinct directions, both normal to a longitudinal direction of the wiping blade 105, so as to project in different sweeping directions of the wiping system. 100.

For example, the first nozzle element(s) 111 may be capable of projecting cleaning fluid towards the visibility zone in an upward sweeping direction, and the second nozzle element(s) 112 may be capable of projecting cleaning fluid towards the zone. visibility in a downward scanning direction. An upward direction may correspond to a sweeping movement from the hood of the vehicle towards the roof.

It is thus ensured that the projection of the cleaning fluid is always in front of the wiper blade 105. It is thus made possible to improve the visibility of the driver or passenger through the visibility zone of the windshield and to make sweeping by the wiper blade 105 more efficient. Such a wiping blade 105 with projection in one channel in one direction and in another channel in another direction is called bi-ramp.

The brush 105 comprises at least three longitudinal channels illustrated with reference to the .

There illustrates a cross section of a wiping blade 105 of a wiping system 100 according to one embodiment of the invention.

The section is thus along a plane XZ normal to a longitudinal direction Y of the wiper blade 105 illustrated on the .

A wiper blade 105 of triangular section is shown on the , for illustrative purposes only. It will be understood that the wiper blade 105 may have a cross section of a different shape.

A first longitudinal channel 210 is capable of transporting the cleaning fluid towards the first nozzle elements 111 described above, in particular in a downward sweeping direction of the wiper blade 105 in the example considered here by way of illustration.

A second longitudinal channel 220 is capable of transporting the cleaning fluid towards the second nozzle elements 112 described above, in particular in an upward sweeping direction of the wiper blade 105 in the example considered here by way of illustration.

A third longitudinal channel 230 is capable of transporting the cleaning fluid to the third nozzle element 113 described above. In the example considered, the projection via the third nozzle element 113 can be carried out when the movable part of the wiping system, namely the arm or the broom, is in a given angular sector, defining a set of positions, as it will be better understood on reading what follows.

The third nozzle element 113 may be capable of dispersing or projecting the cleaning fluid in a mainly longitudinal direction, therefore mainly parallel to the Y-X plane, for example substantially along the Y axis. Alternatively, the third nozzle element 113 may also project oblique manner with an inclination directed towards the windshield.

It is thus advantageous for the third channel 230 to be in a central position relative to the two other channels 210 and 220. The third channel 230 can in particular be further away from the windshield than the other two channels 210 and 220, along the axis Z, when the wiping system is installed 100 in a vehicle.

As shown on the , the projection directions of the first and second spray elements are preferably oblique relative to a glazed surface to be wiped extending mainly in the XY plane, so as to spray the visibility zone before it is swept by the broom wiping 105.

There presents a wiping system 100 mounted on a windshield 310 of a motor vehicle according to one embodiment of the invention.

As illustrated, the wiping system 100 further comprises an injection assembly 301 capable of selectively injecting cleaning fluid into the first second and third longitudinal channels. The wiping system may further comprise a motor 302 to drive the arm 105 and a control unit 303.

No restrictions are attached to the motor 302, which includes any reversible motor making it possible to rotate the mobile part of the wiping system 100 in one direction then in another.

As will be better understood on reading the description of the following figures, the injection assembly 301 may include elements mounted on the arm 105.

No restriction is attached to the control unit 303 which can be a dedicated control unit of the wiping system 100, or which can be a central control unit of the vehicle, also called ECU for "Electronic Control Unit" in English, or “Body Controller”.

The ECU 303 may be capable of receiving, according to the invention, position data of the mobile part of the wiping system, comprising in particular the arm 103 and the wiping blade 105. Such position data are preferably received regularly, at a frequency greater than ten Hertz, when the wiping system 100 is activated.

The position data can be received from the motor 302, or alternatively from a detection device 304 capable of detecting the position of the moving part of the wiping system. No restrictions are attached to the detection device 304, which can be a camera for example.

Location data may include:

- an angular position of the arm 103 and/or the wiper blade 105 within a predetermined range of scanning angles 311, corresponding to a visibility zone swept by the wiper blade 105; and or

- a rotation speed of the arm 103 and/or the wiper blade 105.

The injection assembly 301 is capable of selectively injecting cleaning fluid into one or more of the longitudinal channels 210, 220 and 230. Embodiments of such injection assemblies 301 will be given in reference in Figures 4a to 4e. In particular, the injection assembly 301 is capable of injecting fluid into a single, two or three of the longitudinal channels 210, 200 and 230, at a given instant (or over a time range between receptions of data from consecutive positions).

The selection of one, two or three longitudinal channels 210, 220 and 230 can be made from control signals transmitted by the control unit 303. Alternatively, several control units 303 can be provided, in particular when functions Separate cleaning operations are carried out via the different longitudinal channels. In the following, the example of a single control unit 303 is considered for illustrative purposes only.

The control unit 303 is able to determine such control signals from the position data received either from the motor 302 or from the detection device 304. In particular, the control unit 303 can determine, based on the data position, if the wiper blade 105 sweeps in an upward or downward direction. In the example considered for illustration purposes, it can transmit control signals to the injection unit 301:

- to inject cleaning fluid into the first longitudinal channel 210 when the brush 105 is in a downward sweeping direction;

- to inject cleaning fluid into the second longitudinal channel 220 when the brush 105 is in a downward sweeping direction.

Thus, at a given moment, cleaning fluid is never injected into both the first longitudinal channel 210 and the second longitudinal channel 220, in the example considered here for illustrative purposes.

As the change in scanning direction approaches, when the speed of the brush 105 becomes low in absolute value before canceling out, the injection of cleaning fluid can be suspended in the first and second longitudinal channels 210 and 220.

In addition, according to the invention, the control unit 303 is configured to control the injection of cleaning fluid by the injection assembly 301, in the third longitudinal channel 330, when the arm 103 and/or the broom wiping 105, is located in an angular sector 312, strictly included in the angular range 311 described previously. The angular sector may in particular be less than 30°, for example less than 20°.

The angular sector 312 can be defined so that the wiping system projects cleaning fluid via the third nozzle element 113 towards an optical surface 321 of a sensor 320 of the vehicle. No restriction is attached to the sensor 320 considered, which can be a lidar for example, nor to the position of this sensor 320. For example, on the , a lidar type sensor is shown, with a positioning centered above the windshield 310 of the vehicle.

Thus, the angular sector 312 makes it possible to define a set of positions in which the third nozzle element 113 is facing a part of the optical surface 321 of the sensor 320, or is approaching the optical surface.

The angular sector 312 can advantageously depend on:

- geometric characteristics of the wiping system, in particular of the arm 103 and the wiping blade 105;

- geometric characteristics of the optical surface 321;

- the respective positioning between the wiping system 100 and the optical surface 321;

- of the part of the optical surface 321 to be cleaned. Indeed, the angular sector 312 can be defined to project cleaning fluid on only part of the optical surface 321, for example on a central part. ; and or

- the scanning speed of the wiping system 100. The control signals can thus cause the injection of the product before the third nozzle element 113 faces the optical surface 321.

The control unit 303 can control the injection assembly 301 so as to inject cleaning fluid into the third longitudinal channel:

- when the arm and/or the wiper blade 105 is in the angular sector 312, in the upward sweeping direction;

- when the arm and/or the wiper blade 105 is in the angular sector 312, in the downward sweeping direction; and or

- when the arm and/or the wiping blade 105 is in the angular sector 312, whatever the sweeping direction.

It is thus made possible to allow the cleaning of an optical surface of a sensor located outside the visibility zone of the windshield swept by a wiping system, without having to add a cleaning device dedicated to the sensor, all by optimizing the consumption of cleaning fluid.

On the , the wiping system includes a single arm-wiping blade assembly. However, it may include two such assemblies, one being located on the driver's side, the other on the passenger side. Both sets can be controlled by the control unit 303 in the manner described above. As a variant, only one of these assemblies includes a third nozzle element 113 and a third longitudinal channel 230. It can for example be the arm-broom assembly on the passenger side, or alternatively, the arm-broom assembly driver's side wiper.

The embodiments described below differ by the cleaning fluid injection assembly 301. The embodiments of the injection assembly 301 are again described in an illustrative manner in the context of a twin-ramp wiper blade 105 with a third injection element capable of projecting onto the optical surface of a sensor. It will be understood, however, that the injection assemblies 301 according to the embodiments of the invention are applicable to any wiping system comprising at least three longitudinal channels in the wiping blade 105.

There presents a first fluid injection assembly 301 of a wiping system according to a first embodiment of the invention.

In the first embodiment, the injection assembly 301 comprises:

- a first pump 401.1 and a first injection channel 402.1 capable of injecting cleaning fluid from a cleaning fluid reservoir to the first longitudinal channel 210;

- a second pump 401.2 and a second injection channel 402.2 capable of injecting cleaning fluid from the cleaning fluid reservoir to the second longitudinal channel 220;

- a third pump 401.3 and a third injection channel 402.3 capable of injecting cleaning fluid from the cleaning fluid reservoir to the third longitudinal channel 230.

No restrictions are attached to the type of pumps 401.1 to 401.3. The pumps can be selectively activated/deactivated by the control signals of the control unit 303 in order to carry out the control functions described with reference to the .

It will thus be understood that the control unit 303 can, via control signals:

- activate the first pump 401.1 selectively, for example in the downward scanning direction;

- activate the second pump 401.2 selectively, for example in the upward scanning direction;

- activate the third pump 401.3 selectively, for example in the angular sector 312, in an ascending direction and/or a descending direction.

The injection channels 402.1 to 402.3 are preferably linked to the arm 103, or even integrated under protection of the arm 103, so as not to hinder the scanning of the moving part of the scanning system 100. The same goes for the injection channels presented in the embodiments of the following figures. The junction between the longitudinal channels 210, 220 and 230, with the injection channels 402.1 to 402.3 can be made in the fixing device 104.

There presents a second fluid injection assembly 301 of a wiping system according to a second embodiment of the invention.

In the second embodiment, the injection assembly 301 comprises:

- a first pump 411.1 associated with a first injection channel 412.1 and a second injection channel 412.2, capable of injecting cleaning fluid from a cleaning fluid reservoir to the first longitudinal channel 210 or to the second longitudinal channel 220. For this purpose, the first pump 411.1 can be a bidirectional pump, capable of injecting cleaning fluid into the first injection channel 412.1 or into the second injection channel 412.2, for example depending on a direction of rotation of a motor of the first pump 411.1;

- a second pump 411.2 and a third injection channel 412.3 capable of injecting cleaning fluid from the cleaning fluid reservoir to the third longitudinal channel 230.

The pumps can be controlled by the control unit 303 in the manner described with reference to , or by several control units 303.

It will thus be understood that the control unit 303 can, via control signals:

- selectively activate the motor of the first pump 411.1 in a first direction of rotation, for example when the scanning system sweeps in the downward direction;

- selectively activate the motor of the first pump 411.1 in a second direction of rotation, for example when the scanning system sweeps in the upward direction;

- selectively activate the second pump 411.2, for example when the scanning system 100 is in the angular sector 312, in the ascending direction and/or in the descending direction.

It is thus possible to reduce the number of pumps in the wiping system, which reduces space requirements and costs. In addition, the first bidirectional pump 412.1 is advantageously shared between the first and second longitudinal channels 210 and 220, no simultaneous injection being necessary between these two longitudinal channels.

There presents a third fluid injection assembly 301 of a wiping system according to a third embodiment of the invention.

In the third embodiment, the injection assembly 301 comprises:

- a first pump 421.1, a first injection channel 422.1 connecting the first pump 421.1 to a pressure differential valve 423, the pressure differential valve 423 being connected via a first distribution channel 424.1 to the first longitudinal channel 210, and via a second distribution channel 424.2 to the second longitudinal channel 220. The pressure differential valve 423, also called "Y valve", is capable of directing the fluid from the first injection channel 422.1 towards the first distribution channel 424.1 or towards the second distribution channel 424.2, depending on the pressure of the fluid in the first injection channel 422.1. The first pump 421.1 is capable of varying the injection pressure of the cleaning fluid in order to select one or the other of the injection channels 422.1 and 422.2. We then speak of a dual-pressure pump;

- a second pump 411.2 and a second injection channel 422.2 capable of injecting cleaning fluid from the cleaning fluid reservoir to the third longitudinal channel 230.

Pumps 421.1 and 421.2 can be controlled by control unit 303 in the manner described with reference to .

It will thus be understood that the control unit 303 can, via control signals:

- selectively activate the motor of the first pump 421.1 to inject the cleaning fluid with a first pressure level into the first injection channel 422.1, for example when the scanning system sweeps in the downward direction;

- selectively activate the motor of the first pump 421.1 to inject the cleaning fluid with a second pressure level into the first injection channel 422.1, for example when the scanning system sweeps in the upward direction;

- selectively activate the second pump 421.2, for example when the scanning system 100 is in the angular sector 312, in the ascending direction and/or in the descending direction.

Thus, the number of pumps is reduced compared to the first embodiment, and the number of injection channels is reduced compared to the second embodiment, which reduces the bulk associated with the injection assembly 301.

There presents a fourth fluid injection assembly 301 of a wiping system according to a fourth embodiment of the invention.

In the fourth embodiment, the injection assembly 301 comprises:

- a single pump 431 connected by a single channel 432 to a solenoid valve 436 capable of being controlled to connect the single channel 432 to a first injection channel 435.1 or to a second injection channel 435.2, or to both injection channels 435.1 and 435.2. The pump 431 and the solenoid valve 436 can both be controlled by the control unit 303. The solenoid valve 436 thus acts as a switch between the two injection channels 435.1 and 435.2 and the single channel 432, and can be controlled by control signals;

- a pressure differential valve 433, connected via a first distribution channel 434.1 to the first longitudinal channel 210, and via a second distribution channel 434.2 to the second longitudinal channel 220. The Y-shaped valve 433 is capable of directing the fluid from the first injection channel 435.1 towards the first distribution channel 434.1 or towards the second distribution channel 434.2, depending on the pressure of the fluid in the first injection channel 435.1. The pump 431 is thus capable of varying the injection pressure of the cleaning fluid in order to select one or the other of the injection channels 422.1 and 422.2, when the solenoid valve 436 selects at least the first injection channel. injection 435.1.

The pump 431 and the solenoid valve 436 can be controlled by the control unit 303 in the manner described with reference to .

It will thus be understood that the control unit 303 can, via control signals:

- selectively activate the motor of the pump 431 to inject the cleaning fluid with a first pressure level, and control the solenoid valve to select at least the first injection channel 435.1, for example when the scanning system sweeps in the direction descending;

- selectively activate the motor of the pump 431 to inject the cleaning fluid with a second pressure level, and control the solenoid valve to select at least the first injection channel 435.1, for example when the scanning system sweeps in the direction ascending;

- selectively activate the motor of the pump 431 and control the solenoid valve 436 to select at least the second injection channel 435.2, for example when the scanning system 100 is in the angular sector 312, in the upward direction and/or in the direction descending.

Thus, the number of pumps is reduced compared to the first embodiment, a single dual-pressure pump being provided. The number of injection channels is also two as in the third embodiment. However, it is necessary to also provide an additional solenoid valve, compared to the previous embodiments.

There presents a fifth fluid injection assembly 301 of a wiping system according to a fifth embodiment of the invention.

In the fifth embodiment, the injection assembly 301 comprises:

- a single pump 441 of the bi-pressure and bidirectional type connected by a first injection channel 442.1 to a pressure differential valve 443, and by a second injection channel 442.2 to the third longitudinal channel 230. The pump 441 is bidirectional in that it is capable of selectively injecting fluid into the first injection channel 442.1 or into the second injection channel 442.2, depending on the direction of rotation of the pump motor. In addition, it is capable of injecting cleaning fluid at at least two pressure levels;

- the pressure differential valve 443, connected via a first distribution channel 444.1 to the first longitudinal channel 210, and via a second distribution channel 444.2 to the second longitudinal channel 220. The Y-shaped valve 443 is capable of directing the fluid from the first injection channel 442.1 towards the first distribution channel 444.1 or towards the second distribution channel 444.2, depending on the pressure of the fluid in the first injection channel 442.1. The pump 441 is thus capable of varying the injection pressure of the cleaning fluid in order to select one or the other of the distribution channels 444.1 and 444.2, when the pump 441 rotates in a direction associated with the injection into the first injection channel 442.1.

Pumps 441.1 and 441.2 can be controlled by control unit 303 in the manner described with reference to .

It will thus be understood that the control unit 303 can, via control signals:

- selectively activate the motor of the pump 441 in a first direction to inject the cleaning fluid with a first pressure level, for example when the scanning system sweeps in the downward direction;

- selectively activate the motor of the pump 441 in the first direction to inject the cleaning fluid with a second pressure level, for example when the scanning system sweeps in the upward direction;

- activate the motor of the pump 441 in a second direction to select the second injection channel 435.2, for example when the scanning system 100 is in the angular sector 312, in the ascending direction and/or in the descending direction.

The fifth embodiment thus makes it possible to limit as much as possible the number of elements of the injection assembly 301, while allowing selective injection into the longitudinal channels 210, 220 and 230. The bulk associated with the assembly injection is thus reduced.

There is a diagram illustrating the steps of a process for controlling the injection of cleaning fluid implemented by a control unit 303 of a wiping system 100.

At a step 500, the control unit 303 receives, in real time, position data from the arm 103 or the brush 105. No restriction is attached to the frequency at which the position data is received in real time. Such a frequency is preferably greater than 10Hz, or even 100Hz.

At a step 501, the control unit 303 generates control signals to selectively control the injection of cleaning fluid into the first longitudinal channel 210, into the second longitudinal channel 220 and/or into the third longitudinal channel 230, in depending on the position data received. The control signals can be generated in the manner described above, for example according to the direction of scanning of the wiper blade 105 and according to the position of the arm 103 or the blade 105 relative to the given angular sector.

At a step 502, the control unit 303 transmits the control signals to the injection assembly 301.

Depending on the embodiment, the injection assembly 301 may vary, and the control signals may thus consist of:

- pump activation/deactivation signals;

- a level of injection pressure of a pump, when the pump is dual-pressure;

- a direction of rotation of a pump motor, when a pump is bidirectional;

- a solenoid valve control signal, when the injection assembly includes a solenoid valve.

Of course, the invention is not limited to the examples which have just been described and numerous adjustments can be made to these examples without departing from the scope of the invention.

Claims (9)

Wiping system (100) for a motor vehicle comprising:
- an arm (103);
- a motor (302) capable of driving said arm in rotation;
- a wiper blade (105) configured to wipe a visibility zone of a windshield of the vehicle and capable of being driven by the arm and comprising a first longitudinal channel (210), a second longitudinal channel (220) and a third longitudinal channel (230), at least one first nozzle element (111) in fluid communication with the first longitudinal channel and configured to project cleaning fluid, at least one second nozzle element (112) in fluid communication with the second channel longitudinal and configured to project cleaning fluid, at least a third nozzle element (113) in fluid communication with the third longitudinal channel and configured to project cleaning fluid, said third nozzle element being arranged in a longitudinal end zone ( 120) of the wiper blade;
- an injection assembly (301) capable of selectively injecting a cleaning fluid into the first longitudinal channel, the second longitudinal channel and/or the third longitudinal channel. Wiping system according to claim 1, wherein said at least one first nozzle element is capable of projecting cleaning fluid in a first direction, wherein said at least one second nozzle element is capable of projecting cleaning fluid in a second direction, and in which said at least one third nozzle element is capable of projecting cleaning fluid in a third direction, the first, second and third directions being distinct. Wiping system according to claim 1 or 2, wherein the first direction and the second direction are inclined relative to a longitudinal direction of the wiping blade (105). Wiping system according to one of claims 1 to 3, in which the injection assembly (301) comprises a first pump (401.1) connected to the first longitudinal channel (210) by a first injection channel (402.1) , a second pump (401.2) connected to the second longitudinal channel (220) by a second injection channel (402.2) and a third pump (401.3) connected to the third longitudinal channel (230) by a third injection channel (402.3) . Wiping system according to one of claims 1 to 3, in which the injection assembly comprises a first dual-pressure pump (421.1; 431; 441) capable of injecting cleaning fluid into a first injection channel (422.1; 435.1; 442.1) according to at least a first pressure level or a second pressure level, and a pressure differential valve (423; 433; 443) connecting the first injection channel to the first longitudinal channel (210) or to the second longitudinal channel (220) depending on whether the fluid is injected with the first level or the second pressure level in the first injection channel. Wiping system according to claim 5, further comprising a second pump (421.2) capable of injecting cleaning fluid into a second injection channel (422.2) connected to the third longitudinal channel (230). Wiping system according to claim 5, in which the first pump is a bi-pressure and bidirectional pump (441) capable of selectively injecting cleaning fluid into the first injection channel (442.1) or into a second injection channel (442.1). injection (442.2) connected to the third longitudinal channel (230), depending on a direction of rotation of a pump motor of the first pump. Wiping system according to claim 5, in which the first pump (431) is connected to a solenoid valve (436) by a single channel (432), the solenoid valve being capable of transmitting the cleaning fluid injected by the first pump into the single channel, towards the first injection channel (435.1) or towards a second injection channel (435.2) connected to the third longitudinal channel (230), depending on control signals received from a control unit (303) . Wiping system according to one of claims 1 to 3, in which the injection system (301) comprises a first bidirectional pump (411.1), said first pump being connected to the first longitudinal channel (210) by a first channel injection (412.1) and being connected to the second longitudinal channel (220) by a second injection channel (412.2), the first pump being capable of injecting cleaning fluid into the first injection channel or into the second injection channel injection depending on a direction of rotation of a pump motor of the first pump;
in which the injection assembly further comprises a second pump (411.2) connected to the third longitudinal channel (230) by a third injection channel (412.3).