System for spraying cleaning fluid with two spray nozzles and a directional valve

Abstract

The present invention relates to a system (100) for spraying cleaning fluid comprising a first spray nozzle (140.1) and a second spray nozzle (140.2), each capable of receiving cleaning fluid and spraying it. The system further comprises a directional valve (130) comprising an inlet, a first outlet and a second outlet, the directional valve being capable of conveying cleaning fluid from the inlet to the first outlet when cleaning fluid received at the inlet has a pressure below a given threshold, and which is capable of conveying cleaning fluid from the inlet to the second outlet when the cleaning fluid received at the inlet has a pressure above the given threshold. The system comprises a pump (120) capable of injecting fluid into the directional valve and capable of varying the pressure of the fluid.

Description

[0001] DESCRIPTION

[0002] Title of the invention: Cleaning fluid projection system with two projection nozzles and a directional valve

[0003] The present invention relates to a cleaning fluid projection system, in particular for a motor vehicle wiping system, and in particular a projection system comprising at least two separate projection nozzles.

[0004] It is common for equipment such as a motor vehicle to have a cleaning fluid spray system with several spray nozzles, sometimes even of different types, to perform various cleaning functions on sensor surfaces or windows in particular. Such a spray system with several nozzles is not specific to motor vehicles and may be useful for other equipment with several surfaces to be cleaned.

[0005] It may be possible to use a shared pump to supply cleaning fluid to the nozzles of a projection system. In order to selectively supply two projection nozzles, in particular to supply one then the other, it is known to use a solenoid valve between each projection nozzle and the pump. The solenoid valve can be controlled by an electrical signal in order to distribute or not distribute the cleaning fluid to the projection nozzle.

[0006] However, control by electrical signal is not very robust, particularly in the event of an electrical failure or mechanical shock, requires the use of bulky electrical wires, and is expensive.

[0007] There is therefore a need to provide a cleaning fluid projection system with at least two projection nozzles and a single pump, which is robust, compact, lightweight and inexpensive.

[0008] The present invention improves the situation.

[0009] A first aspect of the invention relates to a cleaning fluid projection system comprising:

[0010] - a first projection nozzle and a second projection nozzle, each capable of receiving cleaning fluid and of projecting said cleaning fluid outside the projection system, for example onto the protective surface of a sensor;

[0011] - a directional valve comprising an inlet, a first outlet and a second outlet, the directional valve being capable of conveying cleaning fluid from the inlet to the first outlet when the cleaning fluid received at the inlet has a pressure below a given threshold, and capable of conveying cleaning fluid from the inlet to the second outlet when the cleaning fluid received at the inlet has a pressure above the given threshold.

[0012] This makes it possible to selectively inject cleaning fluid into two spray nozzles, with a single pump, without requiring solenoid valves controlled by electrical wires. Indeed, the directional valve is capable of being passively controlled, by varying the pressure of the cleaning fluid, either above the given threshold, or below the given threshold. The given threshold can be achieved by a simple mechanical system. Such a mechanical system is more robust than control by electrical wire, less bulky, less expensive and lighter.

[0013] The protective surface of a sensor is the optical surface of the sensor, i.e., the surface through which the sensor signals are transmitted and / or received. The protective surface of the sensor can therefore be the sensor lens, the surface of a housing in which the sensor is located, or any other surface protecting the sensor. The protective surface of a sensor is transparent to the signals intended to be transmitted and / or received by the sensor.

[0014] For example, the spraying system includes a pump adapted to inject cleaning fluid into the directional valve and adapted to vary the pressure of the injected cleaning fluid so that the valve dispenses cleaning fluid into the first spray nozzle or the second spray nozzle.

[0015] According to embodiments, the first and second spray nozzles are configured to spray the cleaning fluid onto an optical surface of a sensor of a motor vehicle. According to embodiments, the first spray nozzle may have at least a first optimal operating value and the second spray nozzle may have at least a second optimal operating value, different from the first optimal operating value, the first optimal operating value of the first spray nozzle may be associated with a first cleaning fluid inlet pressure lower than the given threshold, and the second optimal operating value of the second spray nozzle may be associated with a second cleaning fluid inlet pressure higher than the given threshold.

[0016] This achieves the above-mentioned advantages while optimally supplying the spray nozzles. This optimizes the operation of the cleaning fluid spray system.

[0017] Additionally, said at least one first optimal operating value may be a flow rate value of the first projection nozzle and / or an inlet pressure value of the first projection nozzle, and said at least one second optimal operating value may be a flow rate value of the second projection nozzle and / or a pressure value of the second projection nozzle.

[0018] This ensures that the cleaning fluid is sprayed optimally for each of the spray nozzles.

[0019] According to embodiments, the first projection nozzle may be of a first type, the first type defining a first law between projection nozzle flow rate value and projection nozzle inlet pressure value and the second nozzle may be of a second type, the second type defining a second law between projection nozzle flow rate value and projection nozzle inlet pressure value.

[0020] This makes it possible to share the same pump between several types of projection nozzles, which can perform different projection functions or be responsible for cleaning different glass surfaces.

[0021] According to embodiments, the first projection nozzle may be of a first type and the second projection nozzle may be of a second type. For example, the first and second types may be chosen from:

[0022] - a single fixed projection nozzle;

[0023] - a double fixed projection nozzle;

[0024] - a simple telescopic projection nozzle;

[0025] - a telescopic projection boom with several projection nozzles; and

[0026] - a fixed projection ramp in the shape of an arc of a circle, for example circular or semi-circular, comprising several projection nozzles.

[0027] This makes it possible to use a directional valve in various projection systems, performing different cleaning fluid projection functions.

[0028] In a first embodiment, the first projection nozzle may be a simple telescopic projection nozzle and the second projection nozzle may be a fixed projection ramp in the shape of an arc of a circle, for example circular or semi-circular, comprising several projection nozzles.

[0029] Thus, two separate projection functions can be performed from a single pump, in a robust, lightweight, inexpensive and space-saving manner.

[0030] In a second embodiment, the first nozzle may be a single telescopic projection nozzle and the second projection nozzle may be a telescopic boom with multiple nozzles.

[0031] Such a spray system is particularly advantageous in motor vehicles with several different sensors to clean. For example, advantageously, the single telescopic spray nozzle can be dedicated to cleaning a vehicle camera while the telescopic boom can be dedicated to cleaning a vehicle lidar.

[0032] According to embodiments, the directional valve may comprise a piston in contact with a spring, the piston being able to slide in the directional valve to adopt an equilibrium position depending on a position of the spring and the pressure of the cleaning fluid at the inlet of the directional valve, and the position of the spring may be adjustable by an adjustment element so as to modify the given threshold. Thus, it is possible to modify the given threshold, in particular when one of the projection nozzles is replaced by a new projection nozzle. In addition, it is made possible to use a standard directional valve, adaptable to any projection system according to the invention. The projection system is thus less expensive.

[0033] Additionally, the adjustment element may be a screw, said screw being capable of moving the position of the spring when rotation is applied to the screw so as to modify the given threshold.

[0034] This makes it possible to modify the given threshold easily.

[0035] According to some embodiments, the directional valve comprises

[0036] - a first connecting channel through which the fluid can flow, connected to the inlet and the first outlet,

[0037] - a first valve head provided with a first biasing means, which is movable inside the first connecting channel between an open position when the fluid has a pressure lower than the given threshold and a closed position when the fluid has a pressure higher than the given threshold,

[0038] - a second connecting channel through which fluid can flow, connected to the inlet and the second outlet,

[0039] - a second valve head provided with a second biasing means, which is movable inside the second connecting channel between an open position when the fluid has a pressure greater than the given threshold and a closed position when the fluid has a pressure lower than the given threshold, the first connecting channel being configured to be closed when the first valve head moves from its open position to its closed position, the second connecting channel being configured to be closed when the second valve head moves from its open position to its closed position.

[0040] For example, the first and second valve heads are balls.

[0041] For example, the first and second biasing elements are return elements, for example springs. For example, the first connecting channel comprises a constriction downstream of the first valve head.

[0042] For example, the second connecting channel includes a narrowing upstream of the second valve head.

[0043] The present disclosure further relates to an assembly comprising the projection system according to one of the aforementioned characteristics and at least a first protection surface of a sensor and a second protection surface of a sensor, the first nozzle being configured to project fluid onto the first protection surface and the second nozzle being configured to project fluid onto the second protection surface.

[0044] According to certain embodiments the assembly further comprises a first sensor configured to transmit and / or receive signals through the first protective surface and a second sensor configured to transmit and / or receive signals through the second protective surface.

[0045] Other characteristics and advantages of the invention will become apparent from the following description on the one hand, and from several examples of embodiment given for informational and non-limiting purposes with reference to the attached schematic drawings on the other hand, in which:

[0046] [fig 1] figure 1 illustrates a cleaning fluid projection system according to embodiments of the invention;

[0047] [fig 2] figure 2 illustrates the structure of a directional valve according to one of the embodiments of the invention.

[0048] [fig 3] figure 3 illustrates another embodiment of a directional valve.

[0049] [fig 4a - 4d] Figures 4a to 4d show different types of spray nozzle.

[0050] It should first be noted that while the figures set out the invention in detail for its implementation, they can of course be used to better define the invention where appropriate. It should also be noted that, throughout the figures, elements that are similar and / or fulfill the same function are indicated by the same numbering. Figure 1 illustrates a cleaning fluid projection system 100 according to embodiments of the invention.

[0051] Such a cleaning fluid projection system may be installed on a motor vehicle, or on any other device or vehicle comprising surfaces to be cleaned, in particular glass surfaces, requiring regular or routine cleaning. For example, the surfaces to be cleaned are protective surfaces 180.1, 180.2, sensors 170.1,

[0052] 170.2. In the following, the example of a cleaning fluid projection system 100 for a motor vehicle is considered for illustrative purposes.

[0053] The system 100 comprises a cleaning fluid reservoir 110 storing cleaning fluid, and on which is arranged a pump 120, comprising a pump motor not shown in FIG. 1.

[0054] The pump 120, when its motor is active, is capable of pumping cleaning fluid from the reservoir 110 in order to inject it into an injection channel 150. The injection channel 150 thus connects the outlet of the pump 120 to an inlet of a directional valve, the structure of which will be better understood upon reading the description of FIG. 2. According to the invention, the pump 120 comprises a variable speed motor, expressed in revolutions per minute, and capable of taking values ​​of the order of a few thousand revolutions per minute.

[0055] No restriction is attached to the injection channel, which can be a rigid or flexible channel, having a length depending on the respective locations of the pump 120, the reservoir 110 and the directional valve 130. For example, the length of the injection channel can be between 1 and 10 meters, for example equal to 5 meters.

[0056] The directional valve 130 comprises a first outlet connected to a first projection nozzle 140.1 via a first distribution channel 160.1 and a second outlet connected to a second projection nozzle 140.2 via a second distribution channel.

[0057] 160.2. The directional valve 130 is adapted to convey cleaning fluid from the inlet of the valve 130 to the first outlet when the cleaning fluid is received at the inlet at a pressure below a given threshold. The directional valve 130 is further adapted to convey cleaning fluid from the inlet of the valve 130 to the second outlet when the cleaning fluid is received at the inlet at a pressure above the given threshold.

[0058] The directional valve 130 can thus be controlled passively, and mechanically, so as to select the outlet into which the cleaning fluid is conveyed. Compared to dedicated solenoid valves according to the prior art solution, the use of a directional valve makes it possible to improve the reliability of the control of the valve, since it is then independent of an external control circuit, and makes it possible to avoid the use of electrical control wires and thus reduce the size, weight and costs associated with the cleaning fluid projection system.

[0059] No restriction is attached to the given threshold, which may have a point value, or which may be a range of inlet pressure values ​​of the fluid in the directional valve 130. When a range of pressure values ​​is used, including a low value and a high value, the valve may route the cleaning fluid to the first outlet for inlet pressures lower than the low value, and to the second outlet for inlet pressures higher than the high value. No outlet is thus selected when the inlet pressure in the directional valve 130 is between the low value and the high value.

[0060] In the following, a point threshold value is used for illustrative purposes. No restrictions are attached to the threshold value, which can in particular be fixed or even mechanically adjusted depending on the respective optimum operating values ​​of the first spray nozzle 140.1 and the second spray nozzle 140.2.

[0061] According to preferred embodiments, the first projection nozzle 140.1 has at least a first optimal operating value and the second projection nozzle 140.2 has at least a second optimal operating value, different from the first optimal operating value. The optimal operating values ​​may be respective flow rate values ​​of the first projection nozzle 140.1 and the second projection nozzle 140.2. Alternatively, or in addition, the optimal operating values ​​may be pressure values ​​at the inlet of the projection nozzles 140.1 and 140.2. In particular, depending on the respective types of the projection nozzles 140.1 and 140.2, the optimal pressure values ​​at the inlet of the nozzle and flow rate may vary. For example, each type of projection nozzle may define a relationship between the flow rate value of the projection nozzle and the inlet pressure.

[0062] The first and second spray nozzles 140.1 and 104.2 may advantageously be of two different types. They thus necessarily correspond to distinct optimum operating values, and it is thus possible to inject cleaning fluid selectively into one or the other by setting the given threshold to a value between valve inlet pressure values ​​130 associated with, or corresponding to, the optimum operating values ​​of the two pumps.

[0063] Indeed, to obtain a given flow rate value in a projection nozzle with a given inlet pressure in the projection nozzle, a given pressure value is required at the inlet of the directional valve 130.

[0064] This pressure value given at the input of the directional valve 130 itself corresponds to a given rotation speed of the motor of the pump 120.

[0065] Thus, a first optimal valve inlet pressure value 130 can be defined for the first spray nozzle 140.1 and a second optimal valve inlet pressure value 130 can be defined for the second spray nozzle 140.2. The threshold value is advantageously between the first optimal value and the second optimal valve inlet pressure value 130.

[0066] There are no restrictions on the different types of projection nozzles that the first and second projection nozzles 140.1 and 140.2 may have. These may, for example, be the following examples, given for illustrative purposes:

[0067] - a simple fixed projection nozzle, shown in figure 4a, projecting cleaning fluid through a single opening;

[0068] - a double fixed projection nozzle, projecting cleaning fluid through two or more openings; - a single telescopic projection nozzle, shown in figure 4b, projecting cleaning fluid through a single opening;

[0069] - a telescopic projection boom with several projection nozzles, shown in figure 4c, each comprising an opening for projecting cleaning fluid; and

[0070] - a fixed projection ramp, shown in figure 4d, for example circular or semi-circular, comprising several nozzles. Such a nozzle can be rotating.

[0071] Such spray nozzles are well known and are not further described in this specification.

[0072] According to a first embodiment, the first projection nozzle 140.1 may be a simple telescopic projection nozzle and the second projection nozzle 140.2 may be a fixed circular or semi-circular projection ramp.

[0073] In this first embodiment, the optimal operating values ​​may correspond to the values ​​listed below, given as an indication for real projection nozzles:

[0074] - first projection nozzle 140.1: optimal flow rate of 10.9 ml / s and optimal nozzle inlet pressure of 2.4 bar. These optimal values ​​correspond to an optimal inlet pressure value of valve 130 of 2.7 bar and a pump rotation speed 120 of 2000 revolutions per minute;

[0075] - second projection nozzle 140.2: optimal flow rate of 32 ml / s and optimal nozzle inlet pressure of 2.2 bar. These optimal values ​​correspond to an optimal inlet pressure value of valve 130 of 3.3 bar and a pump rotation speed 120 of 4000 rpm.

[0076] Thus, by setting the given threshold of the directional valve strictly between 2.7 bars and 3.3 bars, which are the optimal pressure values ​​at the inlet of the valve 130, it is possible to select one or the other of the projection nozzles 140.1 and 140.2 while injecting them with cleaning fluid according to their optimal operating values. The given threshold can for example be set to a value of 3 bars. When the directional valve 130 receives cleaning fluid at a pressure of 2.7 bars, the inlet of the directional valve 130 is connected to the first outlet, and the directional valve thus supplies the first projection nozzle 140.1, which is moreover under optimal flow and pressure conditions.

[0077] When the directional valve 130 receives cleaning fluid at a pressure of 3.3 bars, the inlet of the directional valve 130 is connected to the second outlet, and the directional valve thus supplies the second projection nozzle 140.2, which is moreover under optimal flow and pressure conditions.

[0078] Thus, the pump 120 can selectively inject cleaning fluid towards one or other of the projection nozzles 140.1 and 140.2, under optimal conditions, without requiring active control of the directional valve 130, simply by adapting the rotation speed of the pump motor.

[0079] According to a second embodiment, the first projection nozzle 140.1 may be a simple telescopic projection nozzle and the second projection nozzle 140.2 may be a telescopic boom with several semi-circular nozzles.

[0080] In this second embodiment, the optimal operating values ​​may correspond to the values ​​listed below, given as an indication for real projection nozzles:

[0081] - first projection nozzle 140.1: as in the first embodiment, optimal flow rate of 10.9 ml / s and optimal nozzle inlet pressure of 2.4 bars. These optimal values ​​correspond to an optimal inlet pressure value of the valve 130 of 2.7 bars and a pump rotation speed 120 of 2000 revolutions per minute;

[0082] - second spray nozzle 140.2: optimal flow rate of 37.5 ml / s and optimal nozzle inlet pressure of 2.5 bar. These optimal values ​​correspond to an optimal valve inlet pressure value 130 of 3.9 bar and a pump rotation speed 120 of 5000 rpm.

[0083] Thus, as for the first embodiment, by setting the given threshold of the directional valve strictly between 2.7 bars and 3.9 bars, which are the optimal pressure values ​​at the inlet of the valve 130, it is possible to select one or the other of the projection nozzles 140.1 and 140.2 while injecting them with cleaning fluid according to their optimal operating values. The given threshold can for example be set at a value of 3.3 bars.

[0084] When the directional valve 130 receives cleaning fluid at a pressure of 2.7 bars, the inlet of the directional valve 130 is connected to the first outlet, and the directional valve thus supplies the first projection nozzle 140.1, which is moreover under optimal flow and pressure conditions.

[0085] When the directional valve 130 receives cleaning fluid at a pressure of 3.9 bar, the inlet of the directional valve 130 is connected to the second outlet, and the directional valve thus supplies the second projection nozzle 140.2, which is moreover under optimal flow and pressure conditions.

[0086] Thus, the pump 120 can selectively inject cleaning fluid towards one or other of the projection nozzles 140.1 and 140.2, under optimal conditions, without requiring active control of the directional valve 130.

[0087] Figure 2 illustrates the structure of a directional valve 130 according to embodiments of the invention.

[0088] The directional valve 130 comprises an inlet 131, a first outlet 132.1 capable of being connected to the first distribution channel 160.1 previously described, and a second outlet capable of being connected to the second distribution channel 160.2 previously described.

[0089] Depending on the pressure of the cleaning fluid in the inlet 131, the directional valve 130 is able to connect the inlet to the first outlet 132.1 or to the second outlet 132.2. For this purpose, the directional valve 130 may comprise a piston 134 and a spring 135, the cleaning fluid applying pressure to the piston 134 which is transmitted to the spring 135, and which leads to obtaining an equilibrium position of the piston 134 which is a function of the pressure exerted by the cleaning fluid at the inlet, and of the constant of the spring 135 and its position.

[0090] The directional valve may comprise a distribution element 133, which moves integrally with the piston, and which may be placed opposite a first interface of the first outlet 132.1 or opposite a second interface of the second outlet 132.2, depending on the equilibrium position of the piston 134.

[0091] The pressure threshold value thus corresponds to a pressure value for which the distribution element 133 is located between the first interface and the second interface. For pressures lower than the given threshold, the distribution element is thus opposite the first interface, while for pressures higher than the given threshold, the distribution element 133 is opposite the second interface.

[0092] The directional valve 130 may further comprise an adjustment element 136 capable of varying the position of the spring 135, so as to vary the given threshold of the directional valve. The adjustment element may slide in the same conduit as the piston 134 while having a fixed position, which cannot be moved by the spring 135. In this way, when the adjustment element 136 is moved to the right, therefore towards the piston 134, the spring 135 is compressed and the given threshold is increased. Conversely, when the adjustment element 136 is moved to the left, therefore away from the piston 134, the spring 135 is relaxed and the given threshold is decreased.

[0093] The adjustment element 136 may be a screw, which facilitates modification of the given threshold. This involves applying a rotation in one direction or the other to the screw head to cause it to move and induce a modification of the pressure threshold.

[0094] Figure 3 shows another embodiment of a directional valve. In this embodiment, the directional valve comprises a first connecting channel 21.1 through which the fluid can flow, connected to the inlet 131 and the first outlet 132.1 and a first valve head 23.1 provided with a first biasing means 25.1, which is movable inside the first connecting channel 21.1 between an open position when the fluid has a pressure lower than the given threshold and a closed position when the fluid has a pressure higher than the given threshold. The first connecting channel 21.1 is configured to be closed when the first valve head 23.1 moves from its open position to its closed position. Here, the first connecting channel 21.1 comprises a first constriction 27.1 downstream of the first valve head 23.1, and the first valve head 23.1 is a ball having a diameter larger than the largest dimension of the first constriction 27.1, so that in the closed position, the ball blocks the first connecting channel 21.1 at the first constriction 27.1.

[0095] In this embodiment, the directional valve further comprises a second connecting channel 21.2 through which fluid can flow, connected to the inlet 131 and the second outlet 132.2, and a second valve head 23.2 provided with a second biasing means 25.2, which is movable within the second connecting channel 21.2 between an open position when the fluid has a pressure greater than the given threshold and a closed position when the fluid has a pressure lower than the given threshold. The second connecting channel 21.2 is configured to be closed when the second valve head 23.2 moves from its open position to its closed position. Here, the second connecting channel 21.2 comprises a second constriction

[0096] 27.2 upstream of the second valve head 23.2, and the second valve head

[0097] 23.2 is a ball having a larger diameter than the largest dimension of the second constriction 27.2, so that in the closed position, the ball blocks the second connecting channel 21.2 at the second constriction 27.2.

[0098] Here, the first and second stressing elements are return elements, for example springs.

[0099] In Figure 3, the first valve head 23.1 is in an open position and the second valve head 23.2 is in a closed position. The inlet pressure is therefore lower than the given threshold and the fluid exits through the first outlet 132.1.

[0100] When the fluid pressure is higher than the given threshold, the first valve head 23.1 is in a closed position and the second valve head 23.2 is in an open position and the fluid exits through the second outlet 132.2.

[0101] There is also an embodiment in which the first valve head 23.1 is configured to move from the open position to the closed position when the fluid pressure is greater than a first threshold, and the second valve head 23.2 is configured to move from the closed position to the open position when the fluid pressure is greater than a second threshold. Thus, if the first threshold is greater than the second threshold, when the fluid pressure is between the first and second thresholds, the first and second valve heads 23.1, 23.2 are in the open position and the fluid can exit through the first and second outlets 131.1, 131.2. If the first threshold is lower than the second threshold, when the fluid pressure is between the first and second thresholds, the first and second valve heads 23.1, 23.2 are in the closed position and the fluid cannot exit through any of the first and second outlets 132.1, 132.2. 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

CLAIMS. 1 Cleaning fluid projection system (100) comprising: - a first projection nozzle (140.1) and a second projection nozzle (140.2), each adapted to receive cleaning fluid and to project said cleaning fluid outside the projection system, for example onto a first and a second protective surface of a sensor, respectively; - a directional valve (130) comprising an inlet (131), a first outlet (132.1) and a second outlet (132.2), said directional valve being capable of conveying cleaning fluid from the inlet to the first outlet when the cleaning fluid received at the inlet has a pressure lower than a given threshold, and capable of conveying cleaning fluid from the inlet to the second outlet when the cleaning fluid received at the inlet has a pressure higher than the given threshold. 2 Projection system according to claim 1, wherein the first projection nozzle (140.1) has at least a first optimal operating value and the second projection nozzle (140.2) has at least a second optimal operating value, different from the first optimal operating value, wherein the first optimal operating value of the first projection nozzle is associated with a first cleaning fluid inlet pressure lower than the given threshold, and wherein the second optimal operating value of the second projection nozzle is associated with a second cleaning fluid inlet pressure higher than the given threshold. 3 Projection system according to claim 2, wherein said at least one first optimal operating value is a flow rate value of the first projection nozzle (140.1) and / or an inlet pressure value of the first nozzle projection, and wherein said at least one second optimal operating value is a flow rate value of the second projection nozzle (140.2) and / or a pressure value of the second projection nozzle. 4 Projection system according to one of claims 1 to 3, in which the first projection nozzle (140.1) is of a first type, the first type defining a first law between projection nozzle flow rate value and projection nozzle inlet pressure value, in which the second projection nozzle (140.2) is of a second type, the second type defining a second law between projection nozzle flow rate value and projection nozzle inlet pressure value. 5 Projection system according to one of the preceding claims, in which the first projection nozzle (140.1) is of a first type and the second projection nozzle (140.2) is of a second type, in which the first and second types are among: - a single fixed projection nozzle; - a double fixed projection nozzle; - a simple telescopic projection nozzle; - a telescopic projection boom comprising several projection nozzles; and - a fixed projection ramp in the shape of an arc of a circle, for example circular or semi-circular, comprising several projection nozzles. 6 Projection system according to one of the preceding claims, in which the first projection nozzle (140.1) is a simple telescopic projection nozzle and the second projection nozzle (140.2) is a fixed projection ramp in the shape of an arc of a circle, for example circular or semi-circular, comprising several projection nozzles. 7 Projection system according to one of claims 1 to 5, in which the first projection nozzle (140.1) is a simple telescopic projection nozzle and the second projection nozzle (140.2) is a telescopic boom comprising several nozzles. 8 Projection system according to one of the preceding claims, in which the directional valve (130) comprises a piston (134) in contact with a spring (135), the piston being able to slide in the directional valve to adopt an equilibrium position depending on a position of the spring and the pressure of the cleaning fluid at the inlet of the directional valve, in which the position of the spring is adjustable by an adjustment element (136) so as to modify the given threshold. 9 Projection system according to claim 8, wherein the adjustment element (136) is a screw, said screw being adapted to move the position of the spring (135) when a rotation is applied to the screw so as to modify the given threshold. 10 Projection system according to one of the preceding claims in which the directional valve comprises: - a first connecting channel through which the fluid can flow, connected to the inlet and the first outlet, - a first valve head provided with a first biasing means, which is movable inside the first connecting channel between an open position when the fluid has a pressure lower than the given threshold and a closed position when the fluid has a pressure higher than the given threshold, - a second connecting channel through which fluid can flow, connected to the inlet and the second outlet, - a second valve head (320) provided with a second biasing means, which is movable inside the second connecting channel between an open position when the fluid has a pressure higher than the given threshold and a closed position when the fluid has a pressure lower than the given threshold, the first connecting channel being configured to be closed when the first valve head passes from its open position to its closed position, the second connecting channel being configured to be closed when the second valve head passes from its open position to its closed position. 11 Assembly comprising the projection system according to one of the preceding claims and at least a first protection surface of a sensor and a second protection surface of a sensor, the first nozzle being configured to project fluid onto the first protection surface and the second nozzle being configured to project fluid onto the second protection surface. 12 The assembly of claim 11, further comprising a first sensor configured to transmit and / or receive signals through the first protective surface and a second sensor configured to transmit and / or receive signals through the second protective surface.

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