Claims:We Claim:
1. A tank (101) for a selective catalytic reduction system (100), said tank (101) comprising: a supply module (102) fitted inside said tank (101), said supply module (102) adapted to receive an aqueous solution from the tank (101); said supply module (102) comprising: a filter (112) located in said supply module (102), the filter (112) receiving the aqueous solution from the tank (101); a supply pump (103) for pumping the aqueous solution received from the filter (112); characterized in that supply module (102):
a quality sensor (111) placed at an elevation higher than a top surface of the filter (112) in the operative configuration of the tank (101).

2. The tank (101) for a selective catalytic reduction system (100) as claimed in claim 1, wherein the quality sensor (111) is placed at a platform vertically higher than the top surface of the filter (112) in the operative configuration of the tank (101).

3. The tank (101) for a selective catalytic reduction system (100) as claimed in claim 1, wherein the quality sensor (111) is placed in a manner such that on pouring of the aqueous solution inside the tank (101), the aqueous solution comes in contact with the quality sensor (111) before the top surface of the filter (112).

4. A supply module (102) for a selective catalytic reduction system (100), the supply module (102) fitted inside the operative bottom of a tank (101) in the selective catalytic reduction system (100), said supply module (102) adapted to receive an aqueous solution from the tank (101); said supply module (102) comprising: a filter (112) located in said supply module (102), the filter (112) receiving the aqueous solution from the tank (101); a supply pump (103) for pumping the aqueous solution received from the filter (112); characterized in that supply module (102):
a quality sensor (111) placed at an elevation higher than a top surface of the filter (112) in the operative configuration of the supply module (102).

5. The supply module (102) for a selective catalytic reduction system (100) as claimed in claim 4, wherein the quality sensor (111) is placed at a platform vertically higher than the top surface of the filter (112) in the operative configuration of the supply module (102).

6. The supply module (102) for a selective catalytic reduction system (100) as claimed in claim 4, wherein the quality sensor (111) is placed in a manner such that on pouring of the aqueous solution inside the tank (101), the aqueous solution comes in contact with the quality sensor (111) before the top surface of the filter (112).
, Description:Complete Specification:
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed

Field of the invention
[0001] The present disclosure relates to a tank and a supply module for a selective catalytic reduction system. More specifically, the present disclosure related to an integrated supply module with tank for a selective catalytic reduction system.

Background of the invention
[0002] Selective Catalytic Reduction (SCR) is an emission control technology system used in diesel engines. In this technology a liquid-reductant agent is injected into the exhaust stream of a diesel engine. The liquid reductant agent is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF). The DEF sets off a chemical reaction that converts Nitrogen Oxides (NOx) into nitrogen, water and tiny amounts of carbon dioxide (CO2), which is then expelled through the vehicle tailpipe.

[0003] DEF is stored in a tank mounted on vehicle and through hydraulics and dosing request based on NOx conversion efficiency requirements, DEF is dosed into the exhaust stream. There exists a high probability that during re-filling of DEF tank, instead of DEF, a flammable liquid like diesel is filled instead. In such case system would dose diesel in the exhaust line. This could not only damage the system and could lead to hazard by not meeting the legal requirements due to uncontrolled burning of diesel in the exhaust line but also damage components such as a pump used to pump DEF from the tank to a dosing module. A supply module is designed to be welded at the bottom of a reducing agent tank (DEF Tank). Its function is to supply reducing agent DEF (diesel exhaust fluid) from DEF-Tank to the dosing module. In existing Bosch Denoxtronic 5.3 BL Supply Module (DNOX SM 5.3 BL), the pump consists of armature membranes with high-density polyethylene (HDPE) rubber material, which has a limitation due to its chemical properties. When there is an accidental fill of diesel or engine oil, the pump stops working as the membranes with HDPE material contacts diesel and double in size in a span of 3-4 hours.

[0004] Patent application US20150210529A1 “set up for preventing the incorrect filling of a container” discloses A device for preventing the incorrect filling of a container includes a fuel delivery nozzle with an outlet pipe, a container filler neck, into which an end of the fuel nozzle is inserted and a permanent magnet assembly. The magnet assembly includes a first permanent magnet subassembly, with an individual magnet, on one of the outlet pipe and the filler neck and a second permanent magnet subassembly with a plurality of permanent magnets arranged in an annular pattern. The second permanent magnet subassembly is arranged on another of the outlet pipe and the filler neck whereby the first permanent magnet subassembly is arranged radially within the second permanent magnet subassembly, or vice versa, when the fuel nozzle is inserted.

Brief description of the accompanying drawings
[0005] An embodiment of the invention is described with reference to the following accompanying drawings:
[0006] Figure 1 depicts a Selective Catalytic Reduction (SCR) system (100);
[0007] Figure 2 depicts a supply module (102) for the Selective Catalytic Reduction (SCR) system (100).

Detailed description of the drawings
[0008] Figure 1 depicts a Selective Catalytic Reduction (SCR) system (100) in a vehicle. The SCR system (100) comprises a tank (101) and at least a dosing module (104) amongst other components such known to a person skilled in the art. The tank (101) stores an aqueous solution which comprises a diesel exhaust fluid (DEF) which is also known as Ad-blue. It is a liquid reductant agent and usually automotive-grade urea. The dosing module (104) controls the amount of Ad-blue or DEF that needs to be injected from the tank (101) into an exhaust gas tailpipe (105). A selective catalytic reduction reaction occurring in the exhaust gas tailpipe (105) converts nitrogen oxides (NOx) into nitrogen, water and tiny amounts of carbon dioxide (CO2) using Ad-blue fluid, thereby reducing NOx emissions. All the components of the SCR system (100) are in communication with an Electronic Control Unit (ECU (106)) of the vehicle. The ECU (106) regulates the dosing quantity of ad-blue by controlling the operation of the dosing module (104).

[0009] It should be understood at the outset that, although exemplary embodiments are illustrated in the figures and described below, the present disclosure should in no way be limited to the exemplary implementations illustrated in the drawings and described below.

[0010] The tank (101) comprises a supply module (102) fitted inside said tank (101). The supply module (102) is adapted to receive an aqueous solution from the tank (101). The supply module (102) comprises a filter (112) and at least a supply pump (103) amongst other components known to a person skilled in the art such as a heater located in said supply module (102). The filter (112) receives the aqueous solution from the tank (101). The supply pump (103) pumps the aqueous solution received from the filter (112).

[0011] The supply module (102) is characterized by a quality sensor (111) placed at an elevation higher than a top surface of the filter (112) in the operative configuration of the tank (101). In one embodiment of the present disclosure, the quality sensor (111) is placed at a platform vertically higher than the top surface of the filter (112) in the operative configuration of the tank (101). In another embodiment, a sensing element of the quality sensor (111) is suspended vertically higher than the top surface of the filter (112) in the operative configuration of the supply module (102). The quality sensor (111) is placed in a manner such that on pouring of the aqueous solution inside the tank (101), the aqueous solution comes in contact with the quality sensor (111) before the top surface of the filter (112).

[0012] Figure 2 depicts a supply module (102) for the Selective Catalytic Reduction (SCR) system (100). The SCR system (100) components having a bearing on this invention have been elucidated in accordance with Figure 1. The supply module (102) is fitted inside the operative bottom of a tank (101) in the selective catalytic reduction system (100). In an embodiment of the present disclosure, the supply module (102) is welded on the bottom of the tank (101). The supply module (102) adapted to receive an aqueous solution from the tank (101). The supply module (102) comprises: a filter (112) located in said supply module (102), the filter (112) receiving the aqueous solution from the tank (101); a supply pump (103) for pumping the aqueous solution received from the filter (112).

[0013] The most important non-limiting feature of the supply module is the location of the quality sensor (111) with respect to the filter (112). The supply module (102) is characterized by a quality sensor (111) placed at an elevation higher than a top surface of the filter (112) in the operative configuration of the supply module (102). In one embodiment, the quality sensor (111) is placed at a platform vertically higher than the top surface of the filter (112) in the operative configuration of the supply module (102). In another embodiment, a sensing element of the quality sensor (111) is suspended vertically higher than the top surface of the filter (112) in the operative configuration of the supply module (102). The quality sensor (111) is placed in a manner such that on pouring of the aqueous solution inside the tank (101), the aqueous solution comes in contact with the quality sensor (111) before the top surface of the filter (112).

[0014] The main function of the supply module (102) is to deliver the DEF form the tank (101) to the dosing module (104) via a precise solenoid membrane supply pump (103). In some embodiments, the supply module (102) incorporates a heater that is designed to heat the aqueous solution (adblue) keeping it in liquid state in freezing conditions (< -11 °C). Together with the efficient electric heater, this ensures rapid operational readiness of the dosing system (100).

[0015] This idea to develop a tank (101) and a supply module (102) for a selective catalytic reduction system (100) emphasizing on the specific location of the quality sensor (111) with respect to the filter (112) will allow the emulsion of diesel and DEF to touch the sensor and in turn help in detecting the wrong medium in the system (100). This is due to the difference in density of DEF and diesel/engine, the latter floats on DEF. The quality sensor (111) (reflector and transmitter) is positioned above the filter (112) level by retaining the connection to the PCB board, which is also connected to a level sensor. The plastic body, which comprises the quality sensor (111) and the level sensor is modified to accommodate the new platform vertically higher than the top surface of the filter (112), while retaining the same position of the level sensor.

[0016] The quality sensor (111) detects the change in concentration of the DEF with a tolerance value. When there is a change in medium, the values detected are erratic, different from the normal DEF values. The SCR system (100) monitored by the ECU (106) with support of on-board diagnosis can show an error on the dashboard and hence inform the driver about the wrong medium. This will further provide an improved system (100) feature/behavior without allowing the diesel/other liquid to enter the pump. Additionally, this will provide the benefit of protecting the supply pump (103) component (armature membrane that is made of high-density polyethylene (HDPE) rubber material) when there is accidental fill of diesel or other undesired liquid.

[0017] It must be understood that the embodiments explained in the above detailed description are only illustrative and do not limit the scope of this invention. Any modification to the tank (101) and the supply module (102) for a selective catalytic reduction system (100) are envisaged and form a part of this invention. The scope of this invention is limited only by the claims.