Dispenser assembly having sensor assembly

Abstract

Exhaust of an internal combustion engine, such as a diesel engine, includes nitrogen oxide (NOx) compounds. For example, it is desirable to reduce NOx emissions to comply with environmental regulations. To reduce NOx emissions, a reductant may be dispensed into the exhaust gas through more compact components within the aftertreatment system. The reductant assists in converting a portion of the exhaust gas into non-NOx emissions, such as nitrogen (N2), carbon dioxide (CO2), and water (H2O), thereby reducing NOx emissions. These aftertreatment systems may include a pressure sensor and a temperature sensor that take readings from reductant dosed into the exhaust gas. The dispenser assembly includes a dispenser housing and a dispenser positioned at least partially within the dispenser housing. The dispenser assembly also includes a sensor assembly including a pressure sensor assembly having a pressure sensor and a temperature sensor assembly having a temperature sensor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of and priority to U.S. Provisional Application No. 63 / 350,750, filed on June 9, 2022, which is incorporated herein by reference in its entirety. Technical Field

[0002] The present disclosure generally relates to a doser assembly having a sensor assembly. The doser assembly is used in an exhaust gas aftertreatment system of an internal combustion engine. background

[0003] The exhaust gas of an internal combustion engine, such as a diesel engine, includes nitrogen oxide (NOx) compounds. For example, it is desirable to reduce NO x To reduce NO x Emissions, reductant can be distributed into the exhaust gas through the distributor assembly in the aftertreatment system. The reductant helps to convert a portion of the exhaust gas into non-NO x emissions, such as nitrogen (N2), carbon dioxide (CO2) and water (H2O), thereby reducing NO x These aftertreatment systems may include pressure and temperature sensors that take readings from the reductant dosed into the exhaust. Overview

[0004] It can be difficult to mount a reductant pressure sensor and a temperature sensor in an aftertreatment system in a space-efficient manner while ensuring that the accuracy of the pressure and temperature readings is maintained. Embodiments of the present invention address this problem.

[0005] In one embodiment, the dispenser assembly includes a dispenser housing and a dispenser at least partially located in the dispenser housing. The dispenser assembly also includes a sensor assembly. The sensor assembly includes a pressure sensor assembly having a pressure sensor and a temperature sensor assembly having a temperature sensor.

[0006] In another embodiment, the sensor assembly includes a pressure sensor assembly. The pressure sensor assembly includes a pressure sensor housing having a first attachment portion and a pressure sensor at least partially positioned in the pressure sensor housing. The sensor assembly also includes a temperature sensor assembly. The temperature sensor assembly includes a temperature sensor housing having a second attachment portion and a temperature sensor at least partially positioned in the temperature sensor housing. The temperature sensor housing can be selectively attached to and detached from the pressure sensor housing by attaching the second attachment portion to the first attachment portion.

[0007] In another embodiment, a dispenser assembly includes a dispenser housing and a dispenser at least partially positioned within the dispenser housing. The dispenser assembly also includes a sensor assembly, which includes a pressure sensor assembly. The pressure sensor assembly includes a pressure sensor housing and a pressure sensor at least partially positioned in the pressure sensor housing, the pressure sensor housing including a first attachment portion. The sensor assembly also includes a temperature sensor assembly. The temperature sensor assembly includes a temperature sensor housing and a temperature sensor at least partially positioned in the temperature sensor housing, the temperature sensor housing including a second attachment portion. The temperature sensor housing can be selectively attached to and detached from the pressure sensor housing by attaching the second attachment portion to the first attachment portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The present disclosure will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which like reference numerals refer to like elements unless otherwise specified, and in which: Figure 1 is a schematic block diagram of an exemplary exhaust gas aftertreatment system; Figure 2 is a perspective view of a dispenser assembly including a sensor assembly according to one embodiment; Figure 3 According to an embodiment, a cover Figure 2 an exploded view of a dispenser assembly; Figure 4 According to an embodiment, the temperature sensor assembly is not included. Figure 2 a perspective view of a dispenser assembly of the invention; Figure 5 and Figure 6 According to an embodiment Figure 2 A perspective view of a sensor assembly; Figure 7 According to an embodiment Figure 5 and Figure 6 A perspective view of a portion of a sensor assembly; Figure 8 According to an embodiment, a temperature sensor assembly is provided. Figure 5 and Figure 6 An exploded view of the sensor assembly; Fig. 9 According to an embodiment Figure 8 A perspective view of a temperature sensor assembly; Fig.10 is a perspective view of another sensor assembly including a pressure sensor assembly and a pressure sensor housing according to an embodiment; Fig.11 According to an embodiment Fig.10 A perspective view of a pressure sensor housing; Fig.12 According to an embodiment Fig.10 a bottom view of a pressure sensor assembly; Fig.13 According to an embodiment Figure 2 The line 11-11 in Figure 2 a cross-sectional view of a dispenser assembly; Fig.14 According to an embodiment Fig.11 A view of detail A in FIG. Fig.15 and Fig.16 According to an embodiment Figure 2 a top view of a dispenser assembly; Fig.17 According to an embodiment of the present invention, a partially transparent cover Figure 2 a top view of a dispenser assembly; Fig.18 According to an embodiment Fig.17 The line 18-18 in Figure 2 a cross-sectional view of a dispenser assembly of; and Fig.19 According to an embodiment Figure 3 Bottom view of the cover.

[0009] It should be appreciated that the drawings are schematic representations for purposes of illustration. The drawings are provided for the purpose of illustrating one or more embodiments, with the express understanding that they will not be used to limit the scope or meaning of the claims. Detailed Description

[0010] The following is a more detailed description of various concepts and embodiments related to methods, apparatus, and a distributor assembly having a sensor assembly for an exhaust gas aftertreatment system for an internal combustion engine. The various concepts introduced above and discussed in more detail below can be implemented in any of a variety of ways, as the concepts described are not limited to any particular embodiment. Examples of specific embodiments and applications are provided primarily for illustrative purposes.

[0011] I. Overview An internal combustion engine (e.g., a diesel internal combustion engine, etc.) produces exhaust gas, which is typically treated by a doser assembly within an exhaust gas aftertreatment system. The doser assembly typically treats the exhaust gas using a reductant released from the doser assembly by an injector of the doser. The reductant is adsorbed by a catalyst. The adsorption of the reductant in the catalyst serves to reduce NO in the exhaust gas. xThe distributor assembly is mounted on a component of the exhaust gas aftertreatment system. For example, the distributor assembly can be mounted on a decomposition reactor, an exhaust duct, or other similar components of the exhaust gas aftertreatment system.

[0012] In the dispenser assembly, the reductant is delivered through the dispenser housing. The dispenser housing includes a reductant inlet passage and a reductant return passage. The dispenser assembly may include a pressure sensor and a temperature sensor, which obtain readings from the reductant. Typically, the pressure sensor is configured to be partially in the reductant inlet passage, and the temperature sensor is configured to be partially in the reductant return passage. In other cases, the temperature sensor is configured to be in the dispenser assembly but outside the dispenser housing. However, these combinations of pressure measurements performed by the pressure sensor in the reductant inlet passage and temperature measurements performed by the temperature sensor in the reductant return passage or the dispenser assembly are very different from the actual pressure and actual temperature near the injector, partly because the pressure measurement and temperature measurement are taken from different positions. When determining how much reductant is injected in the exhaust gas as the reductant injection amount depends on the accuracy and consistency between the pressure measurement and the temperature measurement, this is not ideal for dosing. In addition, in these configurations, the distance between the pressure sensor and the temperature sensor may require the use of several electrical connectors, which may increase cost and manufacturing complexity, which is undesirable.

[0013] Embodiments herein relate to a dispenser assembly having a sensor assembly that incorporates features that reduce the need for a number of electrical connectors, simplify assembly, and reduce cost compared to other dispenser assemblies. For example, the sensor assembly described herein includes both a pressure sensor assembly having a pressure sensor and a temperature sensor assembly having a temperature sensor. By incorporating both the pressure sensor and the temperature sensor into the same assembly, the dispenser assembly described herein can use fewer electrical connectors than other dispenser assemblies and can be easier to assemble than other dispenser assemblies, and therefore cost less.

[0014] The sensor assembly described herein also includes a pressure sensor housing having a first attachment portion and a temperature sensor housing having a second attachment portion. The temperature sensor housing can be attached and detached from the pressure sensor housing by attaching the second attachment portion to the first attachment portion, thereby combining both the pressure sensor and the temperature sensor into the same assembly. In order to efficiently extract readings (e.g., measurements, etc.) from the pressure sensor and the temperature sensor and to minimize the number of electrical connectors within the sensor assembly, the pressure sensor housing includes a first electrical connector configured to receive electrical connections from both the pressure sensor and the temperature sensor.

[0015] In addition, the dispenser assembly described herein also includes a dispenser housing that incorporates features for improving the determination of the amount of reductant injected into the exhaust gas. The dispenser housing includes a reductant inlet passage and a reductant return passage. Rather than configuring the pressure sensor and the temperature sensor at different locations within the dispenser housing, the dispenser assembly described herein is configured to have both the pressure sensor and the temperature sensor at least partially within the reductant inlet passage or the reductant return passage. As a result, the accuracy and consistency of the pressure measurement of the pressure sensor and the temperature measurement of the temperature sensor are improved, thereby improving the accuracy of determining the amount of reductant injected into the exhaust gas and reducing the distance between the pressure sensor and the temperature sensor.

[0016] II. Overview of exhaust gas aftertreatment system Figure 1 An exhaust gas aftertreatment system 100 is depicted having an exemplary reductant delivery system 102 for an exhaust conduit system 104. The exhaust gas aftertreatment system 100 includes the reductant delivery system 102, a particulate filter (e.g., a diesel particulate filter (DPF)) 106, a decomposition chamber 108 (e.g., a reactor, a reactor tube, etc.), and an SCR catalyst 110.

[0017] The particulate filter 106 is configured (e.g., constructed to, capable of, etc.) to remove particulate matter, such as soot, from the exhaust gas flowing in the exhaust conduit system 104. The particulate filter 106 includes an inlet at which the exhaust gas is received and an outlet at which the exhaust gas exits after substantially filtering the particulate matter from the exhaust gas and / or converting the particulate matter into carbon dioxide. In some embodiments, the particulate filter 106 may be omitted.

[0018] The decomposition chamber 108 is configured to convert the reductant into ammonia. The reductant may be, for example, urea, diesel exhaust fluid (DEF), Adblue®, urea water solution (UWS), aqueous urea solution (e.g., AUS32, etc.), and / or other similar fluids. The decomposition chamber 108 includes an inlet and an outlet, the inlet being fluidly connected to the particle filter 106 to receive exhaust gas containing NOx emissions, and the outlet being used to flow the exhaust gas, NOx emissions, ammonia, and / or reductant to the SCR catalyst 110.

[0019] The reductant delivery system 102 includes a dispenser assembly 112 (e.g., a dispenser module, etc.) configured to dispense the reductant into the decomposition chamber 108 (e.g., via an injector). The dispenser assembly 112 is mounted to the decomposition chamber 108 so that the dispenser assembly 112 can dispense the reductant into the exhaust gas flowing through the exhaust duct system 104. The dispenser assembly 112 can include an insulator (e.g., a vibration insulator, a thermal insulator, etc.) interposed between a portion of the dispenser assembly 112 and a portion of the decomposition chamber 108 on which the dispenser assembly 112 is mounted. The insulator can reduce vibration and / or reduce heat transfer from the decomposition chamber 108 to the dispenser assembly 112.

[0020] The dispenser assembly 112 is fluidly coupled to a reductant source 114 (e.g., fluidly configured to communicate with the reductant source 114, etc.). The reductant source 114 may include a plurality of reductant sources 114. The reductant source 114 may be, for example, a diesel exhaust fluid tank filled with Adblue®. A reductant pump 116 (e.g., a supply unit, etc.) is used to pressurize the reductant from the reductant source 114 for delivery to the dispenser assembly 112. In some embodiments, the reductant pump 116 is pressure controlled (e.g., controlled to obtain a target pressure, etc.). The reductant pump 116 includes a reductant filter 118. Before the reductant is provided to the internal components (e.g., pistons, vanes, etc.) of the reductant pump 116, the reductant filter 118 first filters the reductant (e.g., strains, etc.). For example, the reductant filter 118 may inhibit or prevent solids (e.g., solidified reductant, contaminants, etc.) from being transmitted to the internal components of the reductant pump 116. In this way, the reductant filter 118 can help extend the operation of the reductant pump 116 in good condition. In some embodiments, the reductant pump 116 is coupled (e.g., fastened, attached, attached, welded, etc.) to the chassis of the vehicle associated with the exhaust gas aftertreatment system 100. In some embodiments, the exhaust gas aftertreatment system 100 includes a recirculation conduit 119 coupled to the distributor assembly 112 and a conduit extending from the reductant filter 118 to the reductant pump 116 (e.g., downstream of the reductant filter 118 and upstream of the reductant pump 116). The recirculation conduit 119 provides a portion of the fluid located in the distributor assembly 112 to the reductant pump 116 so that the portion of the fluid can be recirculated to the distributor assembly 112. In other embodiments, the exhaust gas aftertreatment system 100 does not include the recirculation conduit 119 so that the fluid located in the distributor assembly 112 is not recirculated to the distributor assembly 112.

[0021] The dispenser assembly 112 includes at least one injector 120. Each injector 120 is configured to dispense the reductant into the exhaust gas (e.g., within the decomposition chamber 108, etc.). In some embodiments, the reductant delivery system 102 also includes an air pump 122. In these embodiments, the air pump 122 draws air from an air source 124 (e.g., an air intake, etc.) and passes the air through an air filter 126 disposed upstream of the air pump 122. In addition, the air pump 122 provides air to the dispenser assembly 112 via a conduit. In these embodiments, the dispenser assembly 112 is configured to mix the air and the reductant into an air-reductant mixture and provide the air-reductant mixture into the decomposition chamber 108. In other embodiments, the reductant delivery system 102 does not include the air pump 122 or the air source 124. In such embodiments, the dispenser assembly 112 is not configured to mix the reductant with the air.

[0022] The doser assembly 112 and the reductant pump 116 are also electrically or communicatively coupled to a reductant delivery system controller 128. The reductant delivery system controller 128 controls the doser assembly 112 to dispense the reductant into the decomposition chamber 108. The reductant delivery system controller 128 may also control the reductant pump 116.

[0023] The reductant delivery system controller 128 includes a processing circuit 130. The processing circuit 130 includes a processor 132 and a memory 134. The processor 132 may include a microprocessor, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), etc. or a combination thereof. The memory 134 may include, but is not limited to, an electronic, optical, magnetic, or any other storage device or transmission device capable of providing program instructions to the processor, ASIC, FPGA, etc. The memory 134 may include a memory chip, an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a flash memory, or any other suitable memory from which the reductant delivery system controller 128 can read instructions. The instructions may include code from any suitable programming language. The memory 134 may include various modules that include instructions configured to be implemented by the processor 132.

[0024] In various embodiments, the reductant delivery system controller 128 is configured to communicate with a central controller 136 (e.g., an engine control unit (ECU), an engine control module (ECM), etc.) of an internal combustion engine having the exhaust gas aftertreatment system 100. In some embodiments, the central controller 136 and the reductant delivery system controller 128 are integrated into a single controller.

[0025] In some embodiments, the central controller 136 may communicate with a display device (e.g., a screen, a monitor, a touch screen, a heads up display (HUD), an indicator light, etc.). The display device may be configured to change states in response to receiving information from the central controller 136. For example, the display device may be configured to change between a static state (e.g., displaying a green light, displaying a "system OK" message, etc.) and an alarm state (e.g., displaying a flashing red light, displaying a "maintenance required" message, etc.) based on communications from the central controller 136. By changing states, the display device may provide an indication to a user (e.g., an operator, etc.) of the state (e.g., operating, maintenance required, etc.) of the reductant delivery system 102.

[0026] The decomposition chamber 108 is located upstream of the SCR catalyst 110. As a result, the reductant is injected upstream of the SCR catalyst 110 so that the SCR catalyst 110 receives a mixture of the reductant and the exhaust gas. The reductant droplets undergo evaporation, pyrolysis, and hydrolysis processes to form non-NO x Emissions (e.g., gaseous ammonia, etc.).

[0027] The SCR catalyst 110 includes an inlet in fluid communication with the decomposition chamber 108 , from which exhaust gas and reductant are received, and an outlet in fluid communication with an end of the exhaust conduit system 104 .

[0028] The exhaust gas aftertreatment system 100 may further include an oxidation catalyst (eg, a diesel oxidation catalyst (DOC)) in fluid communication with the exhaust conduit system 104 (eg, downstream of the SCR catalyst 110 or upstream of the particulate filter 106 ) to oxidize hydrocarbons and carbon monoxide in the exhaust gas.

[0029] In some embodiments, the particulate filter 106 may be positioned downstream of the decomposition chamber 108. For example, the particulate filter 106 and the SCR catalyst 110 may be combined into a single unit. In some embodiments, the doser assembly 112 may alternatively be positioned downstream of the turbocharger or upstream of the turbocharger.

[0030] The exhaust gas aftertreatment system 100 also includes a distributor mounting bracket 138 (e.g., a mounting bracket, a coupler, a plate, etc.). The distributor mounting bracket 138 couples the distributor assembly 112 to a component of the exhaust gas aftertreatment system 100. The distributor mounting bracket 138 is configured to mitigate heat transfer from the exhaust gas passing through the exhaust duct system 104 to the distributor assembly 112. In this way, the distributor assembly 112 can operate more efficiently and better than other distributor assemblies that cannot mitigate heat transfer. In addition, the distributor mounting bracket 138 is configured to facilitate reliable installation of the distributor assembly 112. This can reduce manufacturing costs associated with the exhaust gas aftertreatment system 100 and ensure repeated desired installation of the distributor assembly 112.

[0031] In various embodiments, the dispenser mounting bracket 138 couples the dispenser assembly 112 to the decomposition chamber 108. In some embodiments, the dispenser mounting bracket 138 couples the dispenser assembly 112 to an exhaust duct of the exhaust duct system 104. For example, the dispenser mounting bracket 138 may couple the dispenser assembly 112 to an exhaust duct of the exhaust duct system 104 that is upstream of the decomposition chamber 108, or to an exhaust duct of the exhaust duct system 104 that is downstream of the decomposition chamber 108. In some embodiments, the dispenser mounting bracket 138 couples the dispenser assembly 112 to the particulate filter 106 and / or the SCR catalyst 110. The location of the dispenser mounting bracket 138 may vary depending on the application of the exhaust gas aftertreatment system 100. For example, in some exhaust gas aftertreatment systems 100, the dispenser mounting bracket 138 may be located at a location more upstream than in other exhaust gas aftertreatment systems 100. Furthermore, some exhaust gas aftertreatment systems 100 may include multiple doser assemblies 112 , and therefore may include multiple doser mounting brackets 138 .

[0032] III. Overview of Exemplary Dispenser Assemblies Figures 2 to 4 and Figures 13 to 18 The dispenser assembly 112 is shown according to various embodiments. The dispenser assembly 112 includes a dispenser housing 200 (eg, body, frame, etc.). The dispenser housing 200 is configured to be coupled to the decomposition chamber 108, and the dispenser housing 200 houses the components of the dispenser assembly 112.

[0033] The dispenser housing 200 includes an inlet port 202. The inlet port 202 is configured to be connected to a conduit that provides a reductant (e.g., from a reductant pump 116, etc.) and air (e.g., from an air pump 122). In an embodiment that does not include the air pump 122, the inlet port 202 only receives the reductant via the conduit. The dispenser assembly 112 also includes an inlet conduit 206 (e.g., a tube, etc.). The inlet conduit 206 is at least partially received in the inlet port 202, so that the inlet conduit 206 allows a hydraulic connection (e.g., via a hose, a tube, etc.) between (i) the reductant pump 116 and the inlet port 202 and (ii) the air pump 122 and the inlet port 202. In an embodiment that does not include the air pump 122, the inlet conduit 206 only allows a hydraulic connection between the reductant pump 116 and the inlet port 202. In other embodiments, the inlet port 202 is configured to be fluidly coupled directly to the reductant pump 116 via a hydraulic connection or directly to the reductant pump 116 and the air pump 122 via a hydraulic connection without the inlet conduit 206 .

[0034] The dispenser housing 200 also includes a filter chamber 204. The filter chamber 204 is fluidly coupled to the inlet port 202. The filter chamber 204 is configured to at least partially receive a dispenser filter 208 (e.g., a filter screen, a filter cartridge, etc.). The dispenser filter 208 filters (e.g., particulate matter filtering, etc.) the reductant from the reductant pump 116 and the air from the air pump 122. In embodiments that do not include the air pump 122, the dispenser filter 208 only filters the reductant from the reductant pump 116. In other embodiments, the dispenser assembly 112 does not include the dispenser filter 208 and relies on filtering the air through the air filter 126 and / or filtering the reductant through the reductant filter 118. The dispenser filter 208 includes a filter screen 210 (e.g., a mesh, etc.). The filter screen 210 helps filter the reductant from the reductant pump 116. The dispenser assembly 112 includes a filter sealing member 212. In some embodiments, the filter screen 210 and the filter sealing member 212 are combined together. The dispenser assembly 112 also includes a filter fastener 214 (e.g., a screw, bolt, etc.). The filter fastener 214 is configured to be at least partially received in the dispenser filter 208, so that the filter screen 210 extends (e.g., projects, protrudes, etc.) around the filter fastener 214, and the filter sealing member 212 is positioned around the filter fastener 214. The filter sealing member 212 provides a seal (e.g., an airtight seal, etc.) between the filter fastener 214 and the dispenser housing 200 (e.g., around the filter chamber 204). When it is desired to access the dispenser filter 208 or access components of the dispenser filter 208 (e.g., the filter screen 210) and / or replace the filter sealing member 212, the filter fastener 214 can be removed (e.g., completely loosened, removed, etc.) and the components can be accessed for maintenance or replacement. It may be desirable to replace the dispenser filter 208 with another dispenser filter 208 having a different filter screen 210 with a different filtration efficiency. In this manner, the user can reconfigure the dispenser assembly 112 so that the dispenser assembly 112 is customized for the intended application. In other embodiments, the dispenser filter 208 does not include a filter fastener 214, so that the dispenser filter 208 is secured to the filter housing 204 by a snap fit (e.g., friction, etc.) between the dispenser filter 208 and the filter housing 204.

[0035] The dispenser housing 200 also includes a reductant inlet passage 220 (e.g., an inlet port, etc.). The reductant inlet passage 220 is fluidly coupled to the filter housing 204. The reductant inlet passage 220 receives fluid (e.g., reductant, air, a reductant and air mixture, etc.) from the dispenser filter 208 and directs the filtered fluid within the dispenser housing 200. In other embodiments, the reductant inlet passage 220 is configured to be part of the filter housing 204 or the inlet port 202.

[0036] The dispenser housing 200 also includes a frost compensation chamber 230. The frost compensation chamber 230 is fluidly coupled to the reductant inlet passage 220. The dispenser assembly 112 also includes a frost compensator 232. The frost compensator 232 is configured to be at least partially received in the frost compensation chamber 230. When the fluid reaches a temperature below its freezing point, the frost compensator 232 compensates for the expansion of the fluid. This prevents the fluid from damaging the dispenser housing 200 when it expands. The frost compensator 232 includes a frost compensation membrane 234. The frost compensator 232 includes a foam insert 236. The foam insert 236 is configured to be received in the frost compensation membrane 234. The foam insert 236 promotes the passage of the reductant in the frost compensation chamber 230 and is configured to be compressed due to the expansion of the reductant in the frost compensation chamber 230. The frost compensator 232 includes a frost compensation fastener 238 (e.g., a plug, a screw, a bolt, etc.). The frost compensation fastener 238 is configured to be at least partially received within the frost compensation chamber 230. The frost compensation fastener 238 is configured to cooperate with the dispenser housing 200 to accommodate the frost compensation membrane 234 and the foam insert 236 in the frost compensation chamber 230. When it is desired to access the frost compensation membrane 234 and / or the foam insert 236, the frost compensation fastener 238 can be removed and the frost compensation membrane 234 and / or the foam insert 236 can be accessed for maintenance or replacement. In some embodiments, the frost compensation fastener 238 is welded to the frost compensation chamber 230. In some embodiments, the foam insert 236 is made of silicone.

[0037] The dispenser housing 200 also includes a dispenser chamber 240. The dispenser chamber 240 is fluidly coupled to the frost compensation chamber 230. The dispenser assembly 112 includes a dispenser 242. The dispenser 242 is configured to be at least partially received within the dispenser chamber 240. The injector 120 is housed within the dispenser 242. The dispenser 242 operates (e.g., controls, manipulates, etc.) the injector 120 based on instructions received from the reductant delivery system controller 128. The dispenser 242 operates the injector 120 by setting the injector 120 to an open position that allows fluid to exit the dispenser assembly 112 or a closed position that prevents fluid from exiting the dispenser assembly 112.

[0038] The dispenser housing 200 includes a reductant return passage 250 (e.g., an outlet port, etc.). The reductant return passage 250 is fluidly coupled to the dispenser chamber 240. The reductant return passage 250 receives any amount of fluid that enters the dispenser housing 200 through the inlet port 202 but is not released from the dispenser assembly 112 through the dispenser chamber 240 via the injector 120. The reductant return passage 250 allows fluid that does not exit the dispenser housing 200 via the injector 120 to be reintroduced into the dispenser housing 200 via the recirculation conduit 119.

[0039] The dispenser housing 200 also includes a first outlet port 252. The first outlet port 252 is fluidly coupled to the reductant return passage 250. The first outlet port 252 is configured to release fluid from the reductant return passage 250 to the outside of the dispenser housing 200. The dispenser assembly 112 includes an outlet pipe fastener 258 (e.g., a screw, bolt, etc.). The outlet pipe fastener 258 is configured to be at least partially received in the first outlet port 252. The dispenser assembly 112 includes an outlet pipe 256 (e.g., a tube, etc.). The outlet pipe 256 is configured to at least partially receive the outlet pipe fastener 258. The outlet pipe 256 allows a hydraulic connection between the reductant return passage 250 and the recirculation conduit 119. The dispenser housing 200 includes a second outlet port 254. The second outlet port 254 is fluidly coupled to the reductant return passage 250. The dispenser assembly 112 includes an outlet fastener 260 (e.g., a plug, a screw, a bolt, etc.). The outlet fastener 260 is configured to be at least partially received within the second outlet port 254. The outlet fastener 260 is configured to prevent fluid from exiting the dispenser housing 200 from the reductant return passage 250 through the second outlet port 254. For example, the outlet fastener 260 can be sealed to the dispenser housing 200 along the entire perimeter (e.g., 360 degrees, etc.) of the outlet fastener 260. In some embodiments, the outlet fastener 260 is welded to the second outlet port 254. In other embodiments, the dispenser housing 200 does not include the second outlet port 254.

[0040] The dispenser assembly 112 also includes a sensor assembly 400. The sensor assembly 400 is configured to be at least partially received within the dispenser housing 200. As explained in greater detail herein, the sensor assembly 400 includes a sensor that provides information to the reductant delivery system controller 128 regarding desired measurements (e.g., pressure, temperature, etc.) obtained within the dispenser housing 200. In this manner, the sensor assembly 400 enables the reductant delivery system controller 128 to desirably control the reductant delivery system 102.

[0041] Sensor assembly 400 includes pressure sensor assembly 500. Pressure sensor assembly 500 can facilitate pressure measurement of fluid within dispenser housing 200. Pressure sensor assembly 500 includes pressure sensor housing 502. Pressure sensor assembly 500 also includes pressure sensor 228. Pressure sensor 228 is configured to be at least partially located within pressure sensor housing 502. Pressure sensor 228 facilitates pressure measurement of fluid within dispenser housing 200.

[0042] The dispenser housing 200 includes a pressure sensor chamber 224. The pressure sensor chamber 224 is fluidly coupled to the reductant inlet passage 220. The pressure sensor chamber 224 is configured to at least partially receive a pressure sensor 228. The pressure sensor 228 facilitates pressure measurement of the fluid in the reductant inlet passage 220. In other embodiments, the pressure sensor chamber 224 is fluidly coupled to the reductant return passage 250 such that the pressure sensor 228 facilitates pressure measurement of the fluid in the reductant return passage 250.

[0043] The sensor assembly 400 also includes a temperature sensor assembly 600. The temperature sensor assembly 600 can facilitate temperature measurement of the fluid within the dispenser housing 200. The temperature sensor assembly 600 includes a temperature sensor housing 602. The temperature sensor assembly 600 also includes a temperature sensor 226. The temperature sensor 226 is configured to be at least partially located within the temperature sensor housing 602. The temperature sensor 226 facilitates temperature measurement of the fluid within the dispenser housing 200.

[0044] The dispenser housing 200 includes a temperature sensor chamber 222. The temperature sensor chamber 222 is fluidly coupled to the reductant inlet passage 220. The temperature sensor chamber 222 is configured to at least partially receive a temperature sensor 226. The temperature sensor 226 facilitates temperature measurement of the fluid in the reductant inlet passage 220. In other embodiments, the temperature sensor chamber 222 is fluidly coupled to the reductant return passage 250 such that the temperature sensor 226 facilitates temperature measurement of the fluid in the reductant return passage 250.

[0045] The dispenser housing 200 also includes a heater chamber 270. The heater chamber 270 is adjacent to the filter chamber 204, the reductant inlet passage 220, the frost compensation chamber 230, the dispenser chamber 240, and the reductant return passage 250. The heater chamber 270 is not fluidly coupled to any passage or aperture of the dispenser housing 200 (e.g., the inlet port 202, the filter chamber 204, the reductant inlet passage 220, the frost compensation chamber 230, the dispenser chamber 240, the reductant return passage 250, the temperature sensor chamber 222, the pressure sensor chamber 224, etc.), such that the heater chamber 270 is isolated from the fluid within the dispenser housing 200.

[0046] The dispenser assembly 112 also includes a heater 272 (e.g., an electric heater, etc.). The heater chamber 270 is configured to receive at least a portion of the heater 272. The heater 272 is in contact with the inner wall of the heater chamber 270, so that when the heater 272 is turned on (e.g., heated, etc.), the heater 272 will conductively heat the dispenser housing 200, thereby increasing the temperature of the reductant in the dispenser housing 200. When the reductant is injected into the decomposition chamber 108 via the injector 120, the increased temperature of the reductant can help the reductant evaporate better. In other embodiments, the heater 272 can be coupled to the outside of the dispenser housing 200 adjacent to the inlet port 202.

[0047] The dispenser housing 200 also includes one or more attachment holes 280. The attachment holes 280 may be disposed along an edge of the dispenser housing 200. The attachment holes 280 are configured to receive attachment fasteners that couple the dispenser housing 200 to the dispenser mounting bracket 138, thereby coupling the dispenser assembly 112 to the dispenser mounting bracket 138.

[0048] The dispenser housing 200 also includes a cover hole 290. The cover hole 290 can be arranged along the edge of the dispenser housing 200. Figure 3 and Fig.19 As shown, the dispenser assembly 112 includes a cover 300. The cover 300 is configured to be coupled to the top surface of the dispenser housing 200, thereby covering and protecting some components of the dispenser assembly 112. The cover 300 includes cover apertures 302. Each cover aperture 302 is aligned with one of the cover holes 290. The cover apertures 302 can be arranged along the edge of the cover 300. The dispenser assembly 112 includes a cover fastener 304. The cover fastener 304 couples the cover 300 to the top surface of the dispenser housing 200 via the cover apertures 302 and the cover holes 290.

[0049] The cover 300 includes an opening 308. The opening 308 is disposed at a top surface of the cover 300. The opening 308 provides quick access to the dispenser 242 without removing the cover 300, which may be desirable for maintenance, inspection, etc. For example, the opening 308 may be configured to receive a tool (e.g., a screwdriver, a hex wrench, etc.) for adjusting the dispenser 242 without removing the cover 300. In other embodiments, the cover 300 does not include the opening 308, such that accessing the dispenser 242 requires removing (e.g., detaching, etc.) the cover 300 from the dispenser housing 200.

[0050] The cover 300 also includes a cap 306. The cap 306 is configured to be coupled to the opening 308. When the cap 306 is coupled to the opening 308, the cap 306 prevents matter (eg, fluid, particulate matter, etc.) from outside the dispenser assembly 112 from entering the dispenser assembly 112 through the opening 308.

[0051] The cover 300 also includes one or more electrical connectors 310. The electrical connectors 310 are coupled to the inner side of the cover 300. The cover 300 also includes an electrical user interface 320 (e.g., a connector, etc.). The electrical user interface 320 is coupled to the exterior of the cover 300. The electrical user interface 320 is coupled to the electrical connector 310. The electrical user interface 320 is also coupled to the reductant delivery system controller 128 via an electronic connector. When the cover 300 is coupled to the dispenser housing 200, the electrical connector 310 is configured to be coupled to some components of the dispenser assembly 112, facilitating (i) passing information from some components of the dispenser assembly 112 to the reductant delivery system controller 128 or from the reductant delivery system controller 128 to some components of the dispenser assembly 112 via the electrical user interface 320, and / or (ii) supplying power from the reductant delivery system controller 128 to some components of the dispenser assembly 112 via the electrical user interface 320.

[0052] The electrical connector 310 includes a sensor connector 312. The sensor connector 312 is configured to provide an electrical connection (e.g., for information transfer, providing power, etc.) between (i) the temperature sensor 226 and the electrical user interface 320 and (ii) between the pressure sensor 228 and the electrical user interface 320. The electrical connector 310 also includes a dispenser connector 314. The dispenser connector 314 is configured to provide an electrical connection between the dispenser 242 and the electrical user interface 320. The electrical connector 310 also includes a heater connector 316. The heater connector 316 is configured to provide an electrical connection between the heater 272 and the electrical user interface 320. In some embodiments, the reductant delivery system controller 128 operates some components of the dispenser assembly 112 via the electrical user interface 320.

[0053] IV. Overview of Exemplary Sensor Assemblies Figures 5 to 12 A sensor assembly 400 is shown according to various embodiments. A pressure sensor housing 502 includes a first attachment portion 504. The first attachment portion 504 is located outside the pressure sensor housing 502. The first attachment portion 504 is configured to allow the pressure sensor housing 502 to be attached to a temperature sensor housing 602. The temperature sensor housing 602 also includes a second attachment portion 604. The second attachment portion 604 is located outside the temperature sensor housing 602. The second attachment portion 604 is configured to be selectively coupled to the first attachment portion 504, so that the temperature sensor housing 602 can be selectively attached to and detached from the pressure sensor housing 502 by attaching (e.g., coupling, etc.) the second attachment portion 604 of the temperature sensor housing 602 to the first attachment portion 504 of the pressure sensor housing 502.

[0054] The pressure sensor housing 502 includes an outer surface 506. In various embodiments, the outer surface 506 of the pressure sensor housing 502 has a cylindrical shape. In other embodiments, the outer surface 506 of the pressure sensor housing 502 has a non-cylindrical shape (e.g., rectangular, trapezoidal, etc.). The pressure sensor housing 502 includes a first support body 510. The first support body 510 extends outward from the outer surface 506 of the pressure sensor housing 502. The first support body 510 includes a first support hole 512. The dispenser housing 200 includes a sensor assembly hole 330. The dispenser assembly 112 includes a first sensor assembly fastener 402 (e.g., a screw, bolt, etc.) and a second sensor assembly fastener 403. The first sensor assembly fastener 402 couples the first support body 510 to the dispenser housing 200 via the first support hole 512 and one of the sensor assembly holes 330, thereby coupling the pressure sensor assembly 500 or the sensor assembly 400 (e.g., the pressure sensor assembly 500 and the temperature sensor assembly 600) to the dispenser housing 200. The first support hole 512 is centered along a first support hole axis 514 .

[0055] The pressure sensor housing 502 also includes a second support body 520. The second support body 520 extends outward from the outer surface 506 of the pressure sensor housing 502. The second support body 520 includes a second support hole 522. The second sensor assembly fastener 403 couples the second support body 520 to the dispenser housing 200 via the second support hole 522 and one of the sensor assembly holes 330, thereby coupling the pressure sensor assembly 500 or the sensor assembly 400 to the dispenser housing 200. The second support hole 522 is centered along a second support hole axis 524.

[0056] In some embodiments, the first support body 510 and the second support body 520 are configured such that the first support hole axis 514 and the second support hole axis 524 are parallel. In other embodiments, the first support body 510 and the second support body 520 are configured such that the first support hole axis 514 and the second support hole axis 524 are not parallel.

[0057] The pressure sensor housing 502 also includes a lower surface 508 (e.g., a bottom surface, etc.). When the pressure sensor assembly 500 or the sensor assembly 400 is coupled to the dispenser housing 200, the lower surface 508 of the pressure sensor housing 502 faces the dispenser housing 200. The first support body 510 also includes a lower surface 516. When the pressure sensor assembly 500 or the sensor assembly 400 is coupled to the dispenser housing 200, the lower surface 516 of the first support body 510 faces the dispenser housing 200. The second support body 520 also includes a lower surface 526. When the pressure sensor assembly 500 or the sensor assembly 400 is coupled to the dispenser housing 200, the lower surface 526 of the second support body 520 faces the dispenser housing 200.

[0058] In some embodiments, the pressure sensor housing 502, the first support body 510, and the second support body 520 are configured such that the lower surface 508 of the pressure sensor housing 502, the lower surface 516 of the first support body 510, and the lower surface 526 of the second support body 520 are all coplanar. This allows the first support body 510 and the second support body 520 to be coupled to the dispenser housing 200 when the top surface of the dispenser housing is flat (e.g., not tilted, etc.). In other embodiments, the pressure sensor housing 502, the first support body 510, and the second support body 520 are configured such that only the lower surface 508 of the pressure sensor housing 502 and the lower surface 516 of the first support body 510 are coplanar (e.g., the lower surface 526 of the second support body 520 is on a different plane than the lower surface 508 of the pressure sensor housing 502 and the lower surface 516 of the first support body 510). This allows the second support body 520 to be coupled to the dispenser housing 200 when a portion of the top surface of the dispenser housing 200 is not flat (e.g., sloped, includes a step, etc.). In other embodiments, the pressure sensor housing 502, the first support body 510, and the second support body 520 are configured so that the lower surface 508 of the pressure sensor housing 502, the lower surface 516 of the first support body 510, and the lower surface 526 of the second support body 520 are all on different planes. This allows the first support body 510 and the second support body 520 to be coupled to the dispenser housing 200 when the top surface of the dispenser housing 200 is not flat.

[0059] like Figure 7As shown, the pressure sensor housing 502 also includes a first electrical connector 530. The first electrical connector 530 is coupled to the outer surface 506 of the pressure sensor housing 502. The first electrical connector 530 is configured to create an electrical connection between the pressure sensor 228, the temperature sensor 226, and the sensor connector 312. The first electrical connector 530 includes a first contact 532 (e.g., a channel, a lead, etc.). In some embodiments, the first contact 532 provides an electrical signal from the pressure sensor 228. The reductant delivery system controller 128 receives the electrical signal from the pressure sensor 228 via the electrical user interface 320. The reductant delivery system controller 128 determines a pressure measurement of the pressure sensor 228 based on the electrical signal from the pressure sensor 228. For example, the reductant delivery system controller 128 can determine the pressure measurement of the pressure sensor 228 based on at least one of a voltage of the electrical signal from the pressure sensor 228, a current of the electrical signal from the pressure sensor 228, or an impedance of the electrical signal from the pressure sensor 228.

[0060] The first electrical connector 530 also includes a second contact 534. In some embodiments, the second contact 534 provides a ground for the pressure sensor 228 and the temperature sensor 226. The first electrical connector also includes a third contact 536. In some embodiments, the third contact 536 provides an electrical signal from the temperature sensor 226. The reductant delivery system controller 128 receives the electrical signal from the temperature sensor 226 via the electrical user interface 320. The reductant delivery system controller 128 determines a temperature measurement of the temperature sensor 226 based on the electrical signal from the temperature sensor 226. For example, the reductant delivery system controller 128 can determine the temperature measurement of the temperature sensor 226 based on at least one of a voltage of the electrical signal from the temperature sensor 226, a current of the electrical signal from the temperature sensor 226, or an impedance of the electrical signal from the temperature sensor 226.

[0061] The first electrical connector includes a fourth contact 538. In some embodiments, the fourth contact 538 is configured as a power supply. As explained in more detail herein, the fourth contact 538 provides an electrical connection that provides a power supply from the reductant delivery system controller 128 to the temperature sensor 226 and the pressure sensor 228 via the electrical user interface 320.

[0062] The pressure sensor housing 502 includes a path 540. The path 540 extends inwardly from the outer surface 506 of the pressure sensor housing 502 through the pressure sensor housing 502. The path 540 facilitates the passage of electronic connectors (e.g., wires, etc.) through the pressure sensor housing 502. The temperature sensor assembly 600 includes one or more wires 606. The wires 606 of the temperature sensor assembly 600 are coupled to the temperature sensor 226. In some embodiments, the wires 606 of the temperature sensor assembly 600 are configured to pass through the path 540 and couple to the second contact 534 and the third contact 536.

[0063] The pressure sensor housing 502 also includes a second electrical connector 550. The second electrical connector 550 is coupled to the outer surface 506 of the pressure sensor housing 502. The second electrical connector 550 is configured to create an electrical connection between the heater 272 and the heater connector 316. The second electrical connector 550 includes a contact 552. The heater 272 includes a wire 274. The wire 274 of the heater 272 is used to provide power to the heater 272. The wire 274 of the heater 272 is configured to be connected to the contact 552. In some embodiments, one contact 552 is configured as a power supply for the heater 272. The contact 552 provides an electrical connection that provides a power supply to the heater 272 from the reductant delivery system controller 128 via the electrical user interface 320, so that the reductant delivery system controller 128 determines the amount of heat emitted by the heater 272. In this embodiment, another contact 552 is configured as a ground for the heater 272.

[0064] exist Figure 5 , Figure 6 , Figure 8 and Fig. 9 In the illustrated embodiment, the first attachment portion 504 includes a first groove 560. The first groove 560 is coupled to the first support body 510. The temperature sensor housing 602 includes a first arm 610. The first arm 610 extends outwardly from the temperature sensor housing 602. The second attachment portion 604 includes a first tab 616. The first tab 616 of the second attachment portion 604 is disposed on a distal end of the first arm 610. The first tab 616 of the second attachment portion 604 is configured to be slidably positioned in the first groove 560. The first arm 610 includes an inner surface 611. When the first tab 616 of the second attachment portion 604 is received in the first groove 560, the inner surface 611 of the first arm 610 faces the outer surface 506 of the pressure sensor housing 502. The first arm 610 includes a lower surface 614. When the sensor assembly 400 is coupled to the dispenser housing 200, the lower surface 614 of the first arm 610 faces the dispenser housing 200.

[0065] exist Figure 5 , Figure 6 , Figure 8 and Fig. 9 In the illustrated embodiment, the first attachment portion 504 further includes a second groove 562. The second groove 562 is coupled to the second support body 520. The temperature sensor housing 602 includes a second arm 620. The second arm extends outwardly from the temperature sensor housing 602. The second attachment portion 604 includes a second lug 626. The second lug 626 of the second attachment portion 604 is disposed on a distal end of the second arm 620. The second lug 626 of the second attachment portion 604 is configured to be slidably positioned in the second groove 562. The second arm 620 includes an inner surface 621. When the second lug 626 of the second attachment portion 604 is received in the second groove 562, the inner surface 621 of the second arm 620 faces the outer surface 506 of the pressure sensor housing 502. The second arm 620 includes a lower surface 624. When the sensor assembly 400 is coupled to the dispenser housing 200, the lower surface 624 of the second arm 620 faces the dispenser housing 200.

[0066] In some embodiments, the first attachment portion 504 is considered to be attached (eg, coupled, engaged, etc.) to the second attachment portion 604 when (i) the first lug 616 of the second attachment portion 604 is received within the first groove 560 or (ii) the second lug 626 of the second attachment portion 604 is received within the second groove 562 .

[0067] In some embodiments, when the first attachment portion 504 is attached to the second attachment portion 604, a gap (e.g., a gap, a space, etc.) is formed in at least one of the following situations: (i) between the inner surface 611 of the first arm 610 and the outer surface 506 of the pressure sensor housing 502, or (ii) between the inner surface 621 of the second arm 620 and the outer surface 506 of the pressure sensor housing 502. The gap provides a positional tolerance (e.g., a manufacturing tolerance, etc.) for the temperature sensor assembly 600 within the sensor assembly 400, so that the temperature sensor 226 can translate along a plane parallel to the lower surface 508 of the pressure sensor housing 502. The positional tolerance allows the temperature sensor 226 to remain fixed relative to the temperature sensor chamber 222 even if the temperature sensor assembly 600 translates relative to the dispenser housing 200 when the sensor assembly 400 is coupled to the dispenser housing 200. Thus, the positional tolerance reduces the risk of fluid exiting the dispenser housing 200 through the temperature sensor chamber 222 during translation of the temperature sensor 226 within the temperature sensor chamber 222 .

[0068] In some embodiments, the pressure sensor housing 502, the first support body 510, the second support body 520, the first arm 610 and the second arm 620 are configured such that the lower surface 508 of the pressure sensor housing 502, the lower surface 516 of the first support body 510, the lower surface 526 of the second support body 520, the lower surface 614 of the first arm 610 and the lower surface 624 of the second arm 620 are all coplanar when the first attachment portion 504 is attached to the second attachment portion 604. This allows the first support body 510 and the second support body 520 to be coupled to the dispenser housing 200 when the top surface of the dispenser housing 200 is flat.

[0069] In other embodiments, when the first attachment portion 504 is attached to the second attachment portion 604, the pressure sensor housing 502, the first support body 510, the second support body 520, the first arm 610, and the second arm 620 are configured so that only the lower surface 508 of the pressure sensor housing 502, the lower surface 516 of the first support body 510, the lower surface 614 of the first arm 610, and the lower surface 624 of the second arm 620 are coplanar (e.g., the lower surface 526 of the second support body 520 is on a different plane than the lower surface 508 of the pressure sensor housing 502, the lower surface 516 of the first support body 510, the lower surface 614 of the first arm 610, and the lower surface 624 of the second arm 620). This allows the second support body 520 to be coupled to the dispenser housing 200 when a portion of the top surface of the dispenser housing 200 is not flat.

[0070] In other embodiments, when the first attachment portion 504 is attached to the second attachment portion 604, the pressure sensor housing 502, the first support body 510, the second support body 520, the first arm 610 and the second arm 620 are configured so that the lower surface 508 of the pressure sensor housing 502, the lower surface 516 of the first support body 510, the lower surface 526 of the second support body 520, the lower surface 614 of the first arm 610 and the lower surface 624 of the second arm 620 are all on different planes. This allows the first support body 510 and the second support body 520 to be coupled to the dispenser housing 200 when the top surface of the dispenser housing 200 is not flat.

[0071] In some embodiments, the inner surface 611 of the first arm 610 has a first arm radius of curvature, the inner surface 621 of the second arm 620 has a second arm radius of curvature, and the outer surface 506 of the pressure sensor housing 502 has a pressure sensor housing radius of curvature. The pressure sensor housing 502, the first arm 610, and the second arm 620 are configured such that (i) the first arm radius of curvature is between 95% and 105% of the pressure sensor housing radius of curvature, inclusive, and (ii) the second arm radius of curvature is between 95% and 105% of the pressure sensor housing radius of curvature, inclusive.

[0072] exist Figure 5 , Figure 6 , Figure 8 and Fig. 9 In the illustrated embodiment, the pressure sensor housing 502 further includes pins 564. The pins 564 extend outwardly from the outer surface 506 of the pressure sensor housing 502. The pins 564 are configured such that a gap 565 is formed between at least one pin 564 and the outer surface 506 of the pressure sensor housing 502. The pressure sensor housing 502 and the temperature sensor housing 602 are configured such that a portion of the temperature sensor housing 602 is received within the gap 565 when the first attachment portion 504 is attached to the second attachment portion 604. The pins 564 are configured to secure (e.g., grasp, hold in place, etc.) the temperature sensor housing 602 to the pressure sensor housing 502 when the first attachment portion 504 is attached to the second attachment portion 604. In some embodiments, the pressure sensor housing 502 includes two pins 564. In other embodiments, the pressure sensor housing 502 includes one pin 564 or more than two pins 564 (e.g., three pins 564, five pins 564, etc.). In other embodiments, the pressure sensor housing 502 does not include pins 564. In these embodiments, when the first attachment portion 504 is attached to the second attachment portion 604 , the temperature sensor housing 602 is secured to the pressure sensor housing 502 via (i) the first lug 616 of the second attachment portion 604 being received within the first groove 560 and / or (ii) the second lug 626 of the second attachment portion 604 being received within the second groove 562 .

[0073] exist Figure 5 , Figure 6 , Figure 8 and Fig. 9In the illustrated embodiment, the second attachment portion 604 further includes an attachment aperture 630. The attachment aperture 630 extends inwardly through the inner surface 611 of the first arm 610. The first attachment portion 504 further includes a first attachment portion lug 566. The first attachment portion lug 566 extends outwardly from the outer surface 506 of the pressure sensor housing 502. When the first attachment portion 504 is attached to the second attachment portion 604, the first attachment portion lug 566 is configured to be positioned in the attachment aperture 630. Figures 10 to 12 The sensor assembly 400 is considered to be Figures 5 to 9 The sensor assembly 400 is the same as that of FIG. 4 , except as otherwise noted.

[0074] exist Fig.10 In another embodiment shown, the first attachment portion 504 includes a first lug 580. The first lug 580 of the first attachment portion 504 extends outward from the outer surface 506 of the pressure sensor housing 502. The first attachment portion 504 includes a second lug 582. The second lug 582 of the first attachment portion 504 extends outward from the outer surface 506 of the pressure sensor housing 502. The first attachment portion includes a first bracket 584. The first bracket 584 extends outward from the outer surface 506 of the pressure sensor housing 502. The first bracket 584 includes a lower surface 585. The first attachment portion 504 includes a second bracket 586. The second bracket 586 extends outward from the outer surface 506 of the pressure sensor housing 502. The second bracket 586 includes a lower surface 587.

[0075] exist Fig.10 In the illustrated embodiment, the temperature sensor housing 602 includes a temperature sensor housing axis 652. The temperature sensor 226 and the temperature sensor housing 602 are centered along the temperature sensor housing axis 652. The second attachment portion 604 includes a central recess 650. The central recess 650 is centered along the temperature sensor housing axis 652. The central recess 650 is configured to receive (i) the first lug 580 of the first attachment portion 504 and (ii) the second lug 582 of the first attachment portion 504, thereby attaching (e.g., coupling, engaging, etc.) the first attachment portion 504 to the second attachment portion 604. When the central recess 650 receives (i) the first lug 580 of the first attachment portion 504 or (ii) the second lug 582 of the first attachment portion 504, the temperature sensor housing 602 is configured to be received by the first bracket 584 and the second bracket 586.

[0076] exist Fig.10In the illustrated embodiment, the temperature sensor housing 602 further includes an upper surface 608. When the central recess 650 receives (i) the first lug 580 of the first attachment portion 504 or (ii) the second lug 582 of the first attachment portion 504, the upper surface 608 of the temperature sensor housing 602 faces the lower surface 585 of the first bracket 584 and the lower surface 587 of the second bracket 586. In other embodiments, the first attachment portion 504 includes only one of the first lug 580 and the second lug 582 and only one of the first bracket 584 and the second bracket 586. In other embodiments, the first attachment portion 504 includes a plurality of first lugs 580 (e.g., two first lugs 580, three first lugs 580, etc.) and a plurality of second lugs 582 (e.g., two second lugs 582, three second lugs 582, etc.), and the second attachment portion 604 includes a plurality of central recesses 650 configured to receive (i) the plurality of first lugs 580 of the first attachment portion 504 and (ii) the plurality of second lugs 582 of the first attachment portion 504.

[0077] V. Overview of Exemplary Sensors exist Fig.13 and Fig.14 In the illustrated embodiment, the pressure sensor 228 includes a measurement unit 700. The measurement unit 700 is coupled to an upper portion of the pressure sensor 228. The measurement unit 700 obtains a pressure reading (e.g., a measurement value, etc.) from the pressure sensor 228 and transmits the pressure reading to the reductant delivery system controller 128 via the electrical user interface 320. The pressure sensor 228 includes a first sealing ring 702. The first sealing ring 702 is coupled to a lower portion of the measurement unit 700. The first sealing ring 702 seals the measurement unit 700 from other components within the pressure sensor 228. The pressure sensor 228 includes a pressure sensor housing 704. The pressure sensor housing 704 contains some of the components of the pressure sensor 228. In some embodiments, the pressure sensor housing 704 is made of plastic (e.g., manufactured from plastic, etc.). In other embodiments, the pressure sensor housing 704 is made of metal.

[0078] The pressure sensor 228 also includes a second sealing ring 706. The second sealing ring 706 is coupled to the exterior of the pressure sensor housing 704. The second sealing ring 706 forms a seal between the pressure sensor 228 and the pressure sensor chamber 224 to minimize or prevent fluid transmission (e.g., leakage, etc.) outside the dispenser housing 200. In other embodiments, the pressure sensor 228 does not include the second sealing ring 706, such that the pressure sensor housing 704 creates a seal between the pressure sensor 228 and the pressure sensor chamber 224.

[0079] The pressure sensor 228 also includes a pressure sensor frost compensation membrane 708. The pressure sensor frost compensation membrane 708 is coupled to the interior of the pressure sensor housing 704. The pressure sensor frost compensation membrane 708 compensates for the expansion of the fluid near the pressure sensor 228. This prevents the fluid from damaging the pressure sensor 228 and the components of the pressure sensor 228 when expanding. The pressure sensor 228 includes an air gap 710. The air gap 710 is coupled between the pressure sensor frost compensation membrane 708 and the pressure sensor housing 704. The air gap 710 provides a compressible space for the pressure sensor frost compensation membrane 708 and the pressure sensor housing 704 when the pressure sensor 228 is subjected to various pressures and temperatures that may cause the pressure sensor frost compensation membrane 708 and / or the pressure sensor housing 704 to expand and contract.

[0080] exist Fig.13 and Fig.14 In the illustrated embodiment, the temperature sensor 226 includes a printed circuit board (PCB) 800. The PCB 800 is coupled to an upper portion of the temperature sensor 226. The PCB 800 is also coupled to the wires 606 of the temperature sensor assembly 600. The PCB 800 obtains a temperature reading (e.g., a measurement, etc.) from the temperature sensor 226 and transmits the temperature reading to the reductant delivery system controller 128 via the electrical user interface 320. The temperature sensor 226 includes a temperature sensor housing 802. The temperature sensor housing 802 houses some of the components of the temperature sensor 226. In some embodiments, the temperature sensor housing 802 is made of plastic. In other embodiments, the temperature sensor housing 802 is made of metal.

[0081] In some embodiments, the temperature sensor 226 also includes a negative temperature coefficient (NTC) compound 804. The NTC compound 804 is coupled to the PCB 800. The NTC compound 804 is a temperature sensing element that allows the temperature sensor 226 to facilitate measurement of the temperature in a specific spatial volume. In other embodiments, the temperature sensor 226 also includes a semiconductor component. The semiconductor component is coupled to the PCB 800. The semiconductor component is a temperature sensing element that allows the temperature sensor 226 to facilitate measurement of the temperature in a specific spatial volume. The semiconductor component may include two identical diodes. In still other embodiments, the temperature sensor 226 includes a thermocouple as a temperature sensing element that allows the temperature sensor 226 to facilitate measurement of the temperature in a specific spatial volume.

[0082] The temperature sensor 226 includes a sleeve 806. The sleeve 806 is coupled to the temperature sensor housing 802. In some embodiments, the sleeve 806 is also coupled to the NTC compound 804. In other embodiments, the sleeve 806 is also coupled to a semiconductor component.

[0083] The sleeve 806 is configured to protect the NTC compound 804 or semiconductor components from the fluid in the dispenser housing 200, to form a seal with the temperature sensor housing 802, and to conduct heat. In some embodiments, the sleeve 806 is made of stainless steel (e.g., metal). In other embodiments, the sleeve 806 is made of other types of metals (e.g., aluminum, copper, etc.).

[0084] The temperature sensor 226 also includes a heat transfer compound 808 (e.g., thermal conductive paste, etc.). The heat transfer compound 808 is coupled to the inside of the sleeve 806. The heat transfer compound 808 is configured to help (e.g., assist, improve, etc.) the sleeve 806 conduct heat. The temperature sensor 226 includes a sealing ring 810. The sealing ring 810 is coupled to the outside of the sleeve 806. The sealing ring 810 (i) protects the sleeve 806 from contacting the inner wall of the temperature sensor chamber 222, and (ii) forms a seal between the temperature sensor 226 and the temperature sensor chamber 222 to minimize or prevent fluid from being transmitted to the outside of the dispenser housing 200. In other embodiments, the temperature sensor 226 does not include the sealing ring 810, so that the temperature sensor housing 802 forms a seal between the temperature sensor 226 and the temperature sensor chamber 222.

[0085] VI. Example Embodiment Configuration Although this specification contains many specific implementation details, these should not be interpreted as limitations on the scope of the content that can be claimed, but should be interpreted as descriptions of features that are unique to specific implementations. Certain features described in this specification in the context of separate implementations can also be implemented in combination in a single implementation. On the contrary, the various features described in the context of a single implementation can also be implemented individually or in any suitable sub-combination in multiple implementations. Moreover, although features can be described as working in certain combinations and even initially claimed as such, one or more features from the claimed combination can be deleted from the combination in some cases, and the claimed combination can involve a sub-combination or a deformation of the sub-combination.

[0086] As utilized herein, the terms "substantially," "approximately," "about," and similar terms are intended to have a broad meaning consistent with common and accepted usage by those of ordinary skill in the art to which the subject matter of the present disclosure belongs. Those skilled in the art who review the present disclosure should understand that these terms are intended to allow a description of certain features described and claimed without limiting the scope of these features to the precise numerical ranges provided. Therefore, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or variations of the subject matter described and claimed are considered to be within the scope of the appended claims.

[0087] As used herein, the term "coupled" and similar terms mean the joining of two components directly or indirectly to one another. Such joining may be fixed (e.g., permanent) or movable (e.g., removable or releasable). Such joining may be achieved by the two components, or the two components and any additional intermediate components, being integrally formed as a single unitary body with one another, or by the two components, or the two components and any additional intermediate components, being attached to one another.

[0088] As used herein, the term "fluidically coupled to" and the like means that two components or objects have a path formed between the two components or objects, and a fluid (such as air, reductant, air-reductant mixture, exhaust gas, hydrocarbon, air-hydrocarbon mixture) can flow in the path with or without an intermediate component or object. Examples of fluid couplings or configurations for achieving fluid communication may include pipes, channels, or any other suitable components for achieving the flow of a fluid from one component or object to another component or object.

[0089] It is important to note that the construction and arrangement of the various systems shown in the various exemplary embodiments are merely illustrative and non-restrictive in nature. All changes and modifications within the spirit and / or scope of the described embodiments need to be protected. It should be understood that some features may not be necessary, and embodiments lacking various features may be considered to be within the scope of the present disclosure, which is defined by the appended claims. When the language "a portion" is used, the item may include a portion and / or the entire item unless explicitly stated to the contrary.

[0090] Additionally, in the context of a list of elements, the term "or" is used in its inclusive sense (rather than its exclusive meaning) such that when used in relation to a list of elements, the term "or" means one, some, or all of the elements in the list. Unless otherwise expressly stated, conjunction language such as the phrase "at least one of X, Y, and Z" is understood in the context to generally convey that an item, term, etc. may be X; Y; Z; X and Y; X and Z; Y and Z; or X, Y, and Z (i.e., any combination of X, Y, and Z). Therefore, unless otherwise stated, such conjunction language is generally not intended and implies that certain embodiments require that at least one X, at least one Y, and at least one Z each be present.

[0091] In addition, unless otherwise indicated, the range of values ​​used herein (e.g., W1 to W2, etc.) includes the maximum and minimum values ​​of the range (e.g., W1 to W2 includes W1 and includes W2, etc.). In addition, unless otherwise indicated, the range of values ​​(e.g., W1 to W2, etc.) is not necessarily required to include intermediate values ​​in the range of values ​​(e.g., W1 to W2 may only include W1 and W2, etc.).

Claims

1. A dispenser assembly comprising: a dispenser housing; a dispenser positioned at least partially within the dispenser housing; and A sensor assembly, the sensor assembly comprising: a pressure sensor assembly, the pressure sensor assembly comprising a pressure sensor, and --A temperature sensor assembly, wherein the temperature sensor assembly comprises a temperature sensor.

2. The dispenser assembly of claim 1, wherein: The dispenser housing includes a reductant inlet passage; and The pressure sensor and the temperature sensor are at least partially positioned within the reductant inlet passage.

3. The dispenser assembly of claim 1, wherein: The dispenser housing includes a reductant return passage, wherein the pressure sensor and the temperature sensor are at least partially positioned within the reductant return passage.

4. The dispenser assembly of claim 3, wherein: The dispenser housing also includes a dispenser chamber fluidly coupled to the reductant return passage and partially receiving the dispenser.

5. The dispenser assembly of claim 1, wherein: The dispenser housing includes a reductant inlet passage; The dispenser housing further includes a filter chamber fluidly coupled to the reductant inlet passage; and The dispenser assembly also includes a dispenser filter positioned at least partially within the filter housing such that the dispenser filter is configured to filter fluid passing through the filter housing.

6. The dispenser assembly of claim 1, wherein: The dispenser housing includes a reductant inlet passage; The dispenser housing further includes a frost compensation chamber fluidly coupled to the reductant inlet passage; and The dispenser assembly also includes a frost compensator at least partially positioned within the frost compensation chamber, the frost compensator including a foam insert configured to allow passage of reductant within the frost compensation chamber and to be compressed due to expansion of the reductant within the frost compensation chamber.

7. The dispenser assembly of claim 1, wherein: The dispenser housing also includes a heater chamber; and The dispenser assembly also includes a heater positioned in the heater chamber and configured to increase a temperature of the reductant within the dispenser housing.

8. A sensor assembly comprising: A pressure sensor assembly, the pressure sensor assembly comprising: a pressure sensor housing, the pressure sensor housing comprising a first attachment portion, and a pressure sensor at least partially positioned within the pressure sensor housing; and A temperature sensor assembly, the temperature sensor assembly comprising: a temperature sensor housing, the temperature sensor housing comprising a second attachment portion, and a temperature sensor at least partially positioned in the temperature sensor housing; Wherein, by attaching the second attachment portion to the first attachment portion, the temperature sensor housing can be selectively attached to and detached from the pressure sensor housing.

9. The sensor assembly of claim 8, wherein: The pressure sensor housing also includes an outer surface; The first attachment portion comprises: a first lug extending outwardly from the outer surface of the pressure sensor housing, a second lug extending outwardly from the outer surface of the pressure sensor housing, a first bracket extending outwardly from the outer surface of the pressure sensor housing, the first bracket including a lower surface, and a second bracket extending outwardly from the outer surface of the pressure sensor housing, the second bracket including a lower surface; The second attachment portion comprises: a central groove centered along the temperature sensor housing axis, the central groove configured to receive the first lug of the first attachment portion and the second lug of the first attachment portion; and The temperature sensor housing also includes an upper surface, wherein the temperature sensor housing is configured to be received by the first bracket and the second bracket such that when the central groove receives (i) the first lug of the first attachment portion or (ii) the second lug of the first attachment portion, the upper surface of the temperature sensor housing faces the lower surface of the first bracket, and the upper surface of the temperature sensor housing faces the lower surface of the second bracket.

10. The sensor assembly of claim 8, wherein: The pressure sensor housing further comprises: --External surface, a first support body extending outwardly from the outer surface of the pressure sensor housing, and a second support body extending outwardly from the outer surface of the pressure sensor housing; The first attachment portion comprises: a first groove coupled to the first support body, and a second groove coupled to the second support body; The temperature sensor housing further comprises: a first arm extending outwardly from the temperature sensor housing, the first arm comprising an inner surface, and a second arm extending outwardly from the temperature sensor housing, the second arm comprising an inner surface; and The second attachment portion comprises: a first lug disposed on a distal end of the first arm, the first lug being configured to be slidably positioned in the first groove such that when the first lug of the second attachment portion is received in the first groove, the inner surface of the first arm faces the outer surface of the pressure sensor housing, and a second lug disposed on a distal end of the second arm, the second lug being configured to be slidably positioned in the second groove such that when the second lug of the second attachment portion is received in the second groove, the inner surface of the second arm faces the outer surface of the pressure sensor housing.

11. The sensor assembly of claim 10, wherein: The pressure sensor housing also includes a lower surface; The first support body further includes a lower surface; and The lower surface of the pressure sensor housing is coplanar with the lower surface of the first support body.

12. The sensor assembly of claim 11, wherein: The first arm also includes a lower surface; The second arm also includes a lower surface; and The pressure sensor housing, the first support body, the first arm and the second arm are configured so that when the first lug of the second attachment portion is received in the first groove, the lower surface of the pressure sensor housing, the lower surface of the first support body, the lower surface of the first arm and the lower surface of the second arm are coplanar.

13. The sensor assembly of claim 10, wherein: The first support body further includes a first support hole configured to receive a first sensor assembly fastener, the first support hole being centered along a first support hole axis; The second support body further includes a second support hole configured to receive a second sensor assembly fastener, the second support hole being centered along a second support hole axis; and The axis of the first support hole is parallel to the axis of the second support hole.

14. The sensor assembly according to claim 10, wherein: The pressure sensor housing also includes a first electrical connector coupled to the outer surface of the pressure sensor housing.

15. The sensor assembly of claim 10, wherein: The inner surface of the first arm has a first arm radius of curvature; The inner surface of the second arm has a second arm radius of curvature; The outer surface of the pressure sensor housing has a pressure sensor housing curvature radius; The first arm has a radius of curvature between 95% and 105% of the radius of curvature of the pressure sensor housing, inclusive; and The second arm has a radius of curvature between 95% and 105% of a radius of curvature of the pressure sensor housing, inclusive.

16. The sensor assembly of claim 10, wherein: The pressure sensor housing further includes at least one pin extending outwardly from the outer surface of the pressure sensor housing such that a gap is formed between the at least one pin and the outer surface of the pressure sensor housing; and The temperature sensor housing and the pressure sensor housing are configured such that a portion of the temperature sensor housing is received in the gap when (i) the first lug of the second attachment portion is received in the first groove or (ii) the second lug of the second attachment portion is received in the second groove.

17. The sensor assembly of claim 10, wherein: The second attachment portion further includes an attachment aperture extending inwardly through the inner surface of the first arm; and The first attachment portion also includes a first attachment portion tab extending outwardly from the outer surface of the pressure sensor housing and configured to be positioned in the attachment aperture when (i) the first tab of the second attachment portion is received in the first groove or (ii) the second tab of the second attachment portion is received in the second groove.

18. A dispenser assembly comprising: a dispenser housing; a dispenser positioned at least partially within the dispenser housing; and A sensor assembly, the sensor assembly comprising: --Pressure sensor assembly, the pressure sensor assembly comprising: a pressure sensor housing, the pressure sensor housing comprising a first attachment portion, and a pressure sensor at least partially positioned in the pressure sensor housing; and --A temperature sensor assembly, the temperature sensor assembly comprising: a temperature sensor housing, the temperature sensor housing comprising a second attachment portion, and a temperature sensor, the temperature sensor being at least partially positioned in the temperature sensor housing; Wherein, by attaching the second attachment portion to the first attachment portion, the temperature sensor housing can be selectively attached to and detached from the pressure sensor housing.

19. A system comprising: a reductant pump configured to pressurize the reductant; and The dispenser assembly according to claim 18, Wherein, the dispenser housing comprises: a dispenser chamber, said dispenser being at least partially positioned within said dispenser chamber, a reductant inlet passage disposed upstream of the dispenser chamber, the reductant inlet passage being configured to receive the reductant from the reductant pump and to provide the reductant to the dispenser chamber, and a reductant return passage disposed downstream of the dispenser chamber, the reductant return passage being configured to receive at least a portion of the reductant from the dispenser chamber and to provide the at least a portion of the reductant to the reductant pump; and Wherein, the pressure sensor and the temperature sensor are at least partially positioned within the reductant inlet passage.

20. A system comprising: a reductant pump configured to pressurize the reductant; and The dispenser assembly according to claim 18, Wherein, the dispenser housing comprises: a dispenser chamber, said dispenser being at least partially located in said dispenser chamber, a reductant inlet passage disposed upstream of the dispenser chamber, the reductant inlet passage being configured to receive the reductant from the reductant pump and to provide the reductant to the dispenser chamber, and a reductant return passage disposed downstream of the dispenser chamber, the reductant return passage being configured to receive at least a portion of the reductant from the dispenser chamber and to provide the at least a portion of the reductant to the reductant pump; and Wherein, the pressure sensor and the temperature sensor are at least partially positioned in the reductant return passage.

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