Fluid injector, assembly and exhaust line comprising such an injector

Abstract

Fluid injector, assembly and exhaust line comprising such an injector The injector is intended to inject an aqueous urea solution into an exhaust duct (12). It comprises: - a single fluid inlet (20) - an injection passage (26), fluidly connecting the inlet (20) to the injection orifice (24); - a device (38) for closing the injection orifice (24) with an actuator (42); - a cooling passage (76), fluidly connected to the injection passage (26) and configured to cool the actuator (42); - a fluid pressure regulating member (82), interposed in the cooling passage (76). Figure for the abstract: 3

Description

Title of the invention: Fluid injector, assembly and exhaust line comprising such an injector

[0001] The invention generally relates to fluid injectors in an exhaust line, the fluid being an aqueous urea solution.

[0002] Such an injector may comprise a fluid inlet and an orifice for injecting the fluid into the exhaust line, an injection passage fluidly connecting the inlet to the injection orifice.

[0003] The injector may further comprise a closure device with a shutter movable between an open position allowing the circulation of the fluid through the injection orifice and a closed position preventing the circulation of the fluid through the injection orifice, as well as an actuator configured to selectively move the shutter between its open and closed positions.

[0004] The fluid injector is supplied from a reservoir, via a pump.

[0005] In such an injector, the actuator is subjected to high temperatures for certain engine speeds in which the gases circulating in the exhaust line are at high temperature. This can ultimately lead to premature damage to the actuator.

[0006] Furthermore, with certain types of pump, the pressure of the fluid supplying the injector is not constant, so that the dosage of the fluid injected into the exhaust line is imprecise.

[0007] In this context, the aim is to propose a fluid injector which does not have the above defects.

[0008] To this end, the invention relates to a fluid injector in an exhaust line, the fluid being an aqueous urea solution, the injector comprising:

[0009] - a single fluid inlet

[0010] - a fluid outlet;

[0011] - an orifice for injecting fluid into the exhaust duct;

[0012] - an injection passage, fluidly connecting the inlet to the injection orifice; - a shut-off device comprising a shutter movable between an open position allowing the circulation of the fluid through the injection orifice and a closed position preventing the circulation of the fluid through the injection orifice, and an actuator configured to selectively move the shutter between its open and closed positions; - a cooling passage, having an upstream portion fluidly connected to the injection passage and a downstream portion connected to the fluid outlet, the cooling passage being configured so that the circulation of fluid along the cooling passage cools the actuator of the shutter device;

[0013] - a fluid pressure regulating member, inserted in the cooling passage dissement.

[0014] Thus, the fluid injector has a passage provided for cooling the actuator of the shut-off device. This cooling is obtained by circulating the same fluid as that which is injected into the exhaust line. This simplifies the arrangement of the injector on board the vehicle, since it is not necessary to connect this injector to another source of fluid, for example to the engine cooling circuit.

[0015] Advantageously, the injection passage and the cooling passage are served by a single fluid inlet. This also helps to simplify the mounting of the fluid injector, since it is not necessary to have one conduit serving the injection passage and another serving the cooling passage. The injector is connected to a single conduit, which simplifies its arrangement on board the vehicle. The size of the injector is reduced.

[0016] Furthermore, the cooling passage is used to house a fluid pressure regulating member, which makes it possible to smooth the fluid pressure supplying the injector. The dosage of the fluid injected into the exhaust line is thus improved. This advantage is obtained without significantly increasing the size of the injector.

[0017] The fluid injector may further have one or more of the following characteristics, considered individually or in all technically possible combinations:

[0018] - the pressure regulating member is configured to regulate a pressure of the fluid entering through the single entrance;

[0019] - the pressure regulating member comprises a seat closing a section of the passage cooling with a regulating orifice for the passage of the fluid, a piston, an elastic member arranged to urge the piston into a position for closing the regulating orifice, the piston being movable under the effect of the pressure of the fluid against a stress exerted by the elastic member from the closing position into a range of positions for clearing the regulating orifice;

[0020] - the shut-off device is a solenoid valve, the actuator comprising a coil magnetic cooled by the circulation of the fluid;

[0021] - the magnetic coil is arranged around an intermediate section of the passage injection extending along a central axis X, the cooling passage comprising a cooling portion arranged around the magnetic coil, an upstream chamber fluidly communicating with the cooling portion and located radially outwardly of the cooling portion, a downstream chamber fluidly communicating with the cooling portion and located radially outwardly of the cooling portion, the upstream portion connecting the upstream chamber to the injection passage;

[0022] - the fluid pressure regulating member is arranged in the upstream portion;

[0023] - the upstream portion opens into an inlet section of the injection passage located between the fluid inlet and the intermediate section;

[0024] - the injection passage comprises a fluid heating chamber and an orifice fluid inlet opening into the heating chamber, the injector comprising another shutoff device comprising another shutter movable between an open position allowing the circulation of fluid through the fluid inlet orifice and a closed position preventing the circulation of fluid through the fluid inlet orifice, and another actuator configured to selectively move the other shutter between its open and closed positions.

[0025] According to a second aspect, the invention relates to an assembly comprising a fluid reservoir, a pump having a suction connected to the fluid reservoir and a discharge, and an injector having the above characteristics, the single fluid inlet being fluidically connected to the discharge of the pump and the fluid outlet being fluidically connected to the reservoir.

[0026] According to a third aspect, the invention relates to an exhaust line comprising an exhaust duct and an assembly having the above characteristics, the injector being configured to inject the fluid into the exhaust duct.

[0027] Other characteristics and advantages of the invention will emerge from the detailed description given below, for information purposes only and in no way limiting, with reference to the appended figures, among which:

[0028] [Fig-1] [Fig.l] is a simplified schematic representation of a vehicle with an exhaust line according to the invention;

[0029] [Fig.2] [Fig.2] is a perspective view of the exhaust line injector of [Fig.l], a portion of the cooling passage being shown in section to reveal the pressure regulating member;

[0030] [Fig.3] [Fig.3] is a perspective view of the injector of [Fig.2], considered according to another incidence, other parts of the injector being represented in section;

[0031] [Fig.4] [Fig.4] is an enlarged view of a portion of the injector of [Fig.3], again other injector organs being shown in section;

[0032] [Fig.5] [Fig.5] is an enlarged view, in section, of a portion of the injection passage and sealing devices; and

[0033] [Fig.6] [Fig.6] is a view similar to that of [Fig.4], for a variant of the sheave lization of the invention.

[0034] In the following, the terms upstream and downstream are defined in relation to the general direction of flow of the fluid, which may be the aqueous urea solution or the exhaust gases.

[0035] A vehicle 2 is shown diagrammatically in [Fig.l].

[0036] The vehicle 2 is typically a land vehicle, such as an automobile, a truck, a bus, a van or any other vehicle traveling on a road.

[0037] Alternatively, the vehicle is a train or a boat.

[0038] The vehicle 2 comprises a heat engine 4 and an exhaust line 10, the exhaust line 10 receiving the exhaust gases emitted by the heat engine 4.

[0039] The heat engine 4 is typically a diesel engine.

[0040] The exhaust gases are purified in the exhaust line 10 and the purified exhaust gases are then discharged into the environment.

[0041] The exhaust line 10 comprises an exhaust duct 12 in which the exhaust gases circulate, and an assembly 14 arranged to inject a fluid into the exhaust duct 12.

[0042] The exhaust duct 12 has an upstream end connected to a manifold (not shown) collecting the exhaust gases produced by the heat engine 4.

[0043] The exhaust line 10 comprises a selective catalytic reduction (SCR) purification member 16, inserted along the exhaust duct 12 downstream of the injection assembly 14.

[0044] The member 16 reduces the NOx contained in the exhaust gases to N2 in the presence of ammonia. The ammonia is generated from urea, in the assembly 14 and / or in the exhaust duct 12.

[0045] The exhaust line 10 typically comprises other elements, which are not shown in [Fig.l]: a catalytic oxidation device, a particle filter, the turbine of a turbocharger, one or more silencers, etc.

[0046] The fluid is an aqueous urea solution, such as AUS32 (for "Aqueous Urea Solution", or aqueous urea solution in French), also commonly called ADBLUE®. This fluid is sometimes called diesel exhaust fluid (DEF in English).

[0047] ADBLUE® is an aqueous urea solution composed of 32.5% urea and 67.5% demineralized water by mass.

[0048] Alternatively, another aqueous urea solution is used, for example with a urea concentration other than 32.5% by mass.

[0049] The injection assembly 14 comprises an injector 18, shown in a more detailed in figures 2 to 5.

[0050] The injector 18 comprises a single fluid inlet 20, a fluid outlet 22, an orifice 24 for injecting the fluid into the exhaust duct 12, and an injection passage 26, fluidically connecting the inlet 20 to the injection orifice 24.

[0051] The assembly 14 also comprises a fluid reservoir 28, a pump 30 having a suction 32 connected to the fluid reservoir 28 and a discharge 34, the single fluid inlet 20 being connected to the discharge 34 of the pump 30 ([Fig.l]). The fluid outlet 22 is fluidically connected to the reservoir 28.

[0052] The fluid inlet 20 is said to be single because the injector 18 does not have any other fluid inlet than the single inlet 20. The injector 18 therefore has a single inlet for the fluid 20.

[0053] The injector 14 is typically fixed to the conduit 12 by means of a fixing flange 36 (visible in [Fig.2]).

[0054] In the example shown, the inlet 20 and the injection orifice 24 are located at two opposite ends of the injector 18 along an axis X.

[0055] The injection passage 26 extends substantially axially from the inlet 20 to the injection orifice 24.

[0056] The injection orifice 24 typically opens directly into the exhaust duct 12.

[0057] The injector 14 further comprises a closure device 38 with a shutter 40 movable between an open position allowing the circulation of fluid through the injection orifice 24 and a closed position preventing the circulation of fluid through the injection orifice 24 ([Fig.5]).

[0058] The shutter device 38 also includes an actuator 42 configured to selectively move the shutter 40 between its open and closed positions.

[0059] In the example shown, the shut-off device 38 is a solenoid valve.

[0060] The shutter 40 is rigidly fixed to a sliding rod 44.

[0061] The actuator 42 comprises an elastic member 46 such as a spring, cooperating with the end of the rod 44 opposite the shutter 40. It urges the shutter 40 towards its closed position via the rod 44.

[0062] The actuator 42 also comprises a magnetic coil 48. The magnetic coil 48, when activated, moves the shutter 40 towards its open position, via the rod 44, against the restoring force of the elastic member 46.

[0063] The magnetic coil 48 is arranged around an intermediate section 50 of the injection passage 26.

[0064] The intermediate section 50 extends along the X axis.

[0065] The elastic member 46 is located inside the intermediate section 50.

[0066] In the example shown, the injection passage 26 comprises a chamber of fluid heater 52, with a fluid inlet 54 controlling the admission of fluid into the heating chamber 52.

[0067] The injector 14 further comprises a further shut-off device 56, with a further shut-off device 58 movable between an open position allowing the fluid to flow through the fluid inlet orifice 54 and a closed position preventing the fluid from flowing through the fluid inlet orifice 54.

[0068] The other shutter device 56 also includes another actuator 60, configured to selectively move the other shutter 58 between its open and closed positions.

[0069] Typically, the other actuator 60 is of the same type as the actuator 38. It comprises a resilient member 62 such as a spring, biasing the other shutter 58 toward its closed position. It also comprises a magnetic coil 64, arranged to move the other shutter 58 toward its open position against the restoring force of the resilient member 62.

[0070] As illustrated in [Fig.5], the heating chamber 52 constitutes the downstream end of the injection passage 26.

[0071] It is closed towards the exhaust duct 12 by a plate 65 in which the injection orifice 24 is arranged.

[0072] The rod 44 passes entirely through the heating chamber 52.

[0073] The fluid inlet orifice 54 is arranged upstream of the intermediate section 50, that is to say between the single inlet 20 and the intermediate section 50.

[0074] The intermediate section 50 communicates with the heating chamber 52 via channels 66 visible in [Fig.5].

[0075] The heating chamber 52 is closed radially outwards by a wall 68. A heating member 70, for example an electrical resistor, is placed around the wall 68, and heats the fluid located inside the heating chamber 52 by conduction through the wall 68.

[0076] A helical part 72 is placed inside the heating chamber 52, and delimits in the heating chamber a helical passage for the fluid from the axial end of the chamber 52 located towards the intermediate section 50 to the axial end of the chamber 52 located at the injection orifice 24.

[0077] The other magnetic coil 64 is axially offset towards the inlet 20 relative to the magnetic coil 48. It is located around another intermediate section 74 of the injection passage 26. The elastic member 62 is placed in the other intermediate section 74.

[0078] The intermediate section 50 and the other intermediate section 74 are located on either side of the inlet orifice 54.

[0079] According to the invention, the injector 14 comprises a cooling passage 76, having an upstream portion 78 fluidly connected to the injection passage 26 and a downstream portion 80 fluidly connected to the fluid outlet 22.

[0080] The cooling passage 76 is configured so that the circulation of fluid along the cooling passage cools the actuator 42 of the closure device 38.

[0081] Furthermore, a fluid pressure regulating member 82 is interposed in the cooling passage 76, as visible in FIGS. 2 to 4.

[0082] More precisely, it is the magnetic coil 48 which is cooled by the circulation of the fluid along the cooling passage 76.

[0083] To do this, the cooling passage 76 comprises a cooling portion 83 arranged around the magnetic coil 48.

[0084] The cooling portion 83 is located radially outwardly relative to the magnetic coil 48. It adjoins the magnetic coil 48, such that the fluid circulating in the cooling portion 83 is in thermal contact with the magnetic coil 48.

[0085] For example, the actuator 42 comprises a cover 84, surrounding the coil 48 and placed towards the outside thereof. The cooling portion 83 is closed radially towards the inside by the cover 84. In other words, the fluid flowing through the cooling portion 83 is directly in contact with the cover 84.

[0086] The cooling portion 83 extends over at least 30% of the periphery of the magnetic coil 48, preferably at least 50% and typically over 75% of the periphery of the magnetic coil.

[0087] The cooling passage 76 also comprises an upstream chamber 86 fluidly communicating with the cooling portion 83 and located radially towards the outside of the cooling portion 83. The upstream chamber 86 is connected by the upstream portion 78 to the injection passage 26.

[0088] As can be seen in the figures, the upstream chamber 86 projects radially towards the outside of the injector relative to the external casing 87 covering the main members of the injector. This facilitates the connection of the cooling portion 83 to the injection channel 26.

[0089] Similarly, the cooling passage 76 comprises a downstream chamber 88, fluidly communicating with the cooling portion 83 and located radially towards the outside of the cooling portion 83.

[0090] In the example shown, the downstream chamber 88 constitutes the downstream portion 80 of the cooling passage.

[0091] The outlet 22 is carried directly by the downstream chamber 88.

[0092] Again, the downstream chamber 88 projects radially outwardly relative to the outer casing 87 covering the main components of the injector. This facilitates the location of outlet 22 and the connection of this outlet 22 to tank 28.

[0093] As can be seen in particular in [Fig.3], the upstream portion 78 opens into an inlet section 90 of the injection passage located between the fluid inlet 20 and the intermediate section 50.

[0094] More precisely, the inlet section 90 is located between the fluid inlet 20 and the other intermediate section 74.

[0095] The pressure regulating member 82 is configured to regulate the pressure of the fluid entering through the fluid inlet 20.

[0096] As visible in Figures 2 to 4, it comprises a seat 92 closing a section of the cooling passage 76 with a regulating orifice 94 for the passage of fluid.

[0097] The pressure regulating member 82 also comprises a piston 96, an elastic member 98 arranged to urge the piston 96 into a position for closing the regulating orifice 94, the piston 96 being movable under the effect of the pressure of the fluid against a stress exerted by the elastic member 96 from its closing position in a range of positions for clearing the regulating orifice 94.

[0098] In other words, the pressure exerted by the fluid entering through the inlet 20 causes the piston 96 to rise and move it away from the seat 92.

[0099] The cooling passage 76 comprises a conduit 100 in which the pressure regulating member 82 is housed.

[0100] The seat 92 is arranged in an upstream end portion of the conduit 100. It completely closes the conduit 100, only the orifice 94 remaining clear for the passage of the fluid.

[0101] A support ring 102 is rigidly fixed inside a downstream end portion of the conduit 100. The ring 102 has a central passage orifice 104 for the fluid.

[0102] The elastic member 98 is for example a helical spring. This spring bears on one side on the ring 102, and on the opposite side on the piston 96. The ring 102 makes it possible to adjust the bearing force exerted by the elastic member 98 on the piston 96.

[0103] This adjustment is carried out by applying a determined air pressure upstream of the seat 92. The ring 102 is moved in the conduit 100 towards the seat 92, compressing the elastic member 98 in an increasing manner, until the air flow rate falls to 0. The ring 102 is then locked in position in the conduit 100, for example by a welding point.

[0104] The piston 96 moves inside an intermediate part of the conduit 100, this intermediate part extending between the seat 92 and the ring 102. The external section of the piston 96 corresponds substantially to the internal section of the intermediate part of the conduit 100. This intermediate part therefore plays the role of a cylindrical for the piston 96.

[0105] When the piston 96 is in a disengaged position, the flow of fluid between the piston 96 and the conduit 100 is possible, by means of notches (not shown) created for this purpose on the periphery of the piston 96. Thus, the circulation of the fluid in the cooling passage is possible in the disengaged position of the piston.

[0106] In the example shown, the conduit 100 is rectilinear, and is carried by the upstream chamber 86. It extends substantially parallel to the axis X. The upstream portion 78 also comprises a radial branch 106, substantially rectilinear, connecting the upstream end part of the conduit 100 to the inlet section 90.

[0107] All the elements of the pressure regulating member 82 are made of a material that is chemically resistant to the injected fluid and is temperature resistant. This fluid is typically an alkaline solution with a pH of up to 10. The pressure regulating member is exposed to temperatures varying between -40°C and +120°C.

[0108] Preferably, the elements of the pressure regulating member 82 are made of stainless steel, for example an austenitic steel.

[0109] The operation of the assembly 14 will now be described.

[0110] When the engine 4 is in operation, the assembly 14 injects the fluid into the exhaust duct 12.

[0111] To do this, the pump 30 sucks the fluid into the reservoir 28 and delivers it to the injector 18.

[0112] The fluid is received by the inlet 20 and flows to the inlet section 90.

[0113] It is distributed partly in the injection passage 26 and partly in the cooling passage 76.

[0114] The closure device 38 and the other closure device 56 are opened and closed in a timed manner so as to admit the fluid into the heating chamber 40, heat it inside the chamber 40, then, when the fluid has reached a determined temperature, inject it into the exhaust duct 12. The closure device 38 and the other closure device 56 are controlled by a control member not shown, programmed for this purpose.

[0115] The actuator 42, which is located relatively close to the exhaust duct 12, undergoes pronounced heating when high temperature exhaust gases circulate in the exhaust line.

[0116] It is maintained at a reasonable temperature by the fluid circulating in the cooling passage 76.

[0117] This fluid first flows through the upstream portion 78 to the upstream chamber 86. From the upstream chamber 86, it flows along the cooling portion 83 to the downstream chamber 88. From the downstream chamber 88 it flows into the outlet 22 and returns to the reservoir 28.

[0118] Under the effect of the pressure of the fluid arriving via the inlet 20, the piston 96 is moved into its release position range, against the restoring force of the elastic member 98. The fluid can then flow along the cooling passage.

[0119] When the pressure of the fluid at the inlet 20 of the injector undergoes variations, due to the operation of the pump 30, the force exerted by the fluid on the piston 96 also varies.

[0120] If the fluid pressure at the inlet 20 decreases, the elastic member 98 will move the piston 96 towards the seat 92, which will contribute to compressing the fluid and therefore will at least partially compensate for the drop in fluid pressure at the inlet 20.

[0121] Conversely, if the fluid pressure increases, the force exerted by the fluid on the piston 96 also increases, which causes the piston to move away from the seat 92. This movement will at least partially compensate for the increase in pressure at the inlet 20.

[0122] The injector described above has multiple advantages.

[0123] It allows the actuator to be maintained at a reasonable temperature, compatible with its proper long-term operation.

[0124] It makes it possible to attenuate the variations in fluid pressure at the inlet of the injector, which contributes to obtaining a good dosage of the quantity of fluid injected into the exhaust duct by the injector.

[0125] The injector is particularly compact and easy to install on board the vehicle, in particular because it is the aqueous urea solution which is used as the heat transfer fluid.

[0126] The fact that the injector has only one fluid inlet also helps to make it compact.

[0127] The fluid pressure regulating member is integrated inside the injector, which further reduces the overall size of the system.

[0128] Due to its structure, the cooling passage can be adapted to injectors initially designed to be cooled by circulation of a fluid such as engine coolant.

[0129] The injector can have multiple variants.

[0130] The injector does not necessarily comprise two shut-off devices, one controlling the admission of fluid into a heating chamber and the other the ejection of fluid from the heating chamber. The alternative injector comprises only one shut-off device, shutting off the injection orifice.

[0131] The injector does not necessarily have a heating chamber.

[0132] The shut-off device is not necessarily a solenoid valve, with an actuator comprising a magnetic coil. The actuator can be of any suitable type.

[0133] Similarly, the fluid pressure regulating member is not necessarily of the piston type. Other pressure regulating members may be envisaged.

[0134] An alternative embodiment is shown in [Fig.6].

[0135] Only the points by which this variant differs from that of figures 1 to 5 will be detailed below. Elements that are identical or provide the same functions will be designated by the same references as in the variant of figures 1 to 5.

[0136] In the embodiment variant of [Fig.6], the fluid inlet 20 is placed in the extension of the conduit 100. It is not along the X axis.

[0137] The radial branch 106 thus belongs to the injection passage 26, the fluid circulating in this radial branch from the fluid inlet 20 to the inlet section 90.

[0138] This variant is advantageous for adjusting the bearing force exerted by the elastic member 98 on the piston 96.

[0139] This adjustment is carried out in the variant of [Fig.6] by introducing a force sensor through the fluid inlet 20, and by placing it in abutment on the piston 96 through the orifice 94. The position of the ring 102 is fixed when the force measured by the force sensor corresponds to the pressure sought to cause the piston 96 to lift relative to the seat 92.

[0140] This procedure allows direct and easy calibration of the opening pressure of the pressure regulating member 82.

Claims

Claims

1. Fluid injector into an exhaust duct (12), the fluid being an aqueous urea solution, the injector (18) comprising: - a single fluid inlet (20) - a fluid outlet (22); - an orifice (24) for injecting the fluid into the exhaust duct (12); - an injection passage (26), fluidically connecting the inlet (20) to the injection orifice (24); - a closure device (38) comprising a shutter (40) movable between an open position allowing the circulation of the fluid through the injection orifice (24) and a closed position preventing the circulation of the fluid through the injection orifice (24), and an actuator (42) configured to selectively move the shutter (40) between its open and closed positions;- a cooling passage (76), having an upstream portion (78) fluidly connected to the injection passage (26) and a downstream portion (80) connected to the fluid outlet (22), the cooling passage (76) being configured so that the circulation of fluid along the cooling passage (76) cools the actuator (42) of the closure device (38); - a fluid pressure regulating member (82), interposed in the cooling passage (76).;

2. An injector according to claim 1, wherein the pressure regulating member (82) is configured to regulate a pressure of the fluid entering through the single inlet (20).

3. An injector according to claim 1 or 2, wherein the pressure regulating member (82) comprises a seat (92) closing a section of the cooling passage (76) with a regulating orifice (94) for the passage of the fluid, a piston (96), an elastic member (98) arranged to urge the piston (96) into a position for closing the regulating orifice (94), the piston (96) being movable under the effect of the pressure of the fluid against a stress exerted by the elastic member (98) from the closing position into a range of positions for clearing the regulating orifice (94).

4. An injector according to any preceding claim, wherein the shut-off device (38) is a solenoid valve, the actuator (42) comprising a magnetic coil (48) cooled by the circulation of the fluid.

5. An injector according to claim 4, wherein the magnetic coil (48) is arranged around an intermediate section (50) of the injection passage (26) extending along a central axis X, the cooling passage (76) comprising a cooling portion (83) arranged around the magnetic coil (48), an upstream chamber (86) fluidly communicating with the cooling portion (83) and located radially outwardly of the cooling portion (83), a downstream chamber (88) fluidly communicating with the cooling portion (83) and located radially outwardly of the cooling portion (83), the upstream portion (78) connecting the upstream chamber (86) to the injection passage (26).

6. An injector according to claim 5, wherein the fluid pressure regulating member (82) is arranged in the upstream portion (78).

7. Injector according to claim 5 or 6, in which the upstream portion (78) opens into an inlet section (90) of the injection passage (76) located between the fluid inlet (20) and the intermediate section (50).

8. An injector according to any preceding claim, wherein the injection passage (26) comprises a fluid heating chamber (52) and a fluid inlet orifice (54) opening into the heating chamber (54), the injector (18) comprising a further shutoff device (56) comprising a further shutoff member (58) movable between an open position allowing fluid to flow through the fluid inlet orifice (54) and a closed position preventing fluid to flow through the fluid inlet orifice (54), and a further actuator (60) configured to selectively move the further shutoff member (58) between its open and closed positions.

9. An assembly (14) comprising a fluid reservoir (28), a pump (30) having a suction (32) connected to the fluid reservoir (28) and a discharge (34), and an injector (18) according to any preceding claim, the single fluid inlet (20) being fluidically connected to the discharge (34) of the pump (30) and the fluid outlet (22) being fluidically connected to the reservoir (28).

10. Exhaust line (10) comprising an exhaust duct (12) and an assembly according to claim 9, the injector (18) being configured to inject the fluid into the exhaust duct (12).

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