Description:Complete specification: The following specification particularly describes the invention and the manner in which it is to be performed.

Field of the invention:
[0001] The present disclosure relates to a supply module of a Selective Catalytic Reduction (SCR) system, and particularly to a housing cover of the supply module.

Background of the invention:
[0002] NOx gases are harmful to the environment. They are emitted by the exhaust of modern vehicles. It is essential to reduce these emissions of NOx gases. A system to reduce the emission of these NOx gases is called an SCR system. SCR is an acronym for Selective Catalytic Reduction. This system includes a storage tank, a supply module, a dosing module, an exhaust gas path and a few sensors. AdBlue is a water-based ammonia solution used to reduce the emission of NOx gases. This AdBlue solution flows from the reservoir through the supply module, the dosing module, and the exhaust gas path. This AdBlue solution must be dosed by a Selective Catalytic Reduction (SCR) system component commonly known as the supply module.

[0003] This Selective Catalytic Reduction (SCR) system is applicable to both passenger and non-passenger vehicles. The system for Selective Catalytic Reduction (SCR) differs between the two types of vehicles listed above. In the case of passenger vehicles, the supply module of the Selective Catalytic Reduction system is installed within the storage tank, whereas in the case of non-passenger or commercial vehicles, the supply module is affixed external to the storage tank.

[0004] As known in the state of the art, the AdBlue freezes below -11°C. AdBlue's volume increases by 10% to 12% as it solidifies. AdBlue stalls uniformly due to the geometric profile of the supply module housing cover. Thus, the elastomeric material of the valve module's membrane freezes first, followed by the solenoid, which acts as a magnet. The force exerted by AdBlue on the solenoid could cause damage to the valve module's internal components. Therefore, it is necessary to improve AdBlue's internal stopping behavior to facilitate its expansion without harming the internal components of the supply module's valve module.

Brief description of the accompanying drawings:
[0005] Fig 1 describes a system schematic diagram of a Selective Catalytic Reduction (SCR) system;
[0006] Fig 2 describes a pumping module of a supply module of the Selective Catalytic Reduction (SCR) system;
[0007] Fig 3 describes a top profile geometry of a housing cover of the supply module of the Selective Catalytic Reduction (SCR) system.

Detailed description of the embodiments:
[0008] Figure 1 discloses a Selective Catalytic Reduction (SCR) system (7) which comprises a storage tank (9), a supply module (2), a dosing module (10), and at least an exhaust gas path (17). It also comprises some sensors like a NOx sensor/ multi-gas sensor (11), a particulate matter sensor (12), a differential pressure sensor (13) and an exhaust-gas temperature sensor (14).

[0009] The storage tank (9) contains an AdBlue (18) solution. The storage tank (9) is connected to the supply module (2) via an inlet pipe (16). The supply module (2) delivers AdBlue (18) which is an aqueous solution of urea with required pressure into the dosing module (10) via an outlet pipe (15). The supply module comprises a pumping module (8) and at least a housing cover (1) amongst other components known to a person skilled in the art.

[0011] The dosing module (10) ensures that the right quantity of AdBlue (18) is dosed into the exhaust gas path (17). In a purging mode, AdBlue (18) is sucked from the storage tank (9) into the supply module (2), then into then finally into the dosing module (10).
[0012] The NOx sensor/multi-gas sensor (11) is used in the regulation of the dosed quantity of urea by sensing the level of NOx gases in the Selective Catalytic Reduction (SCR) system (7).The particulate matter sensor (12) helps in monitoring the functioning of the Diesel Particle Filter (DPF) and reducing the particulate emissions. The differential pressure sensor (13) measures the pressure drop across the Diesel Particle Filter (DPF) and the exhaust gas temperature sensor (14) is used to monitor the temperature of the exhaust gas.

[0014] In the present Selective Catalytic Reduction (SCR) system (7), the supply module (2) is located outside of the storage tank (9). Hence, it is exposed to the external environment. It is called a Double Injection Selective Catalytic Reduction (SCR) system (7) for commercial vehicles.

[0015] Figure 2 discloses the pumping module (4) of a supply module (2) of the Selective Catalytic Reduction (SCR) system (3). The pumping module (4) comprises a pump (5) and a valve module (6). The pump (5) consists of a shaft connected to a motor used to create vacuum inside the chamber to suck the AdBlue (18). It is surrounded by eccentric whose center has an offset with respect to that of the shaft. There is a pleuel which transfers the rotary motion of the motor into the linear motion of the shaft. A bearing between the pleuel and the eccentric helps in reducing the friction between the shaft and the pleuel. There is a membrane which is made up of an elastomeric material. It is connected to the pleuel, and the valve module (6) and it serves for the compensation of the volume inside the supply module (2).
[0016] The valve module (6) comprises of two solenoids (7) which are used to control the direction of the flow of the AdBlue (18) either for the suction of the AdBlue (18) from the storage tank (9) into the supply module (2) or for the delivery of the AdBlue (18) to the dosing module (10) from the supply module (2). This flow of AdBlue (18) is controlled through two valves (20) namely suction valve and pressure valve. The solenoids (7), when energized with electricity, produce magnet flux, thus behaving like a magnet. The solenoids (7) comprise an armature, a spring (19), and a foil each. The sides of the solenoids (7) are surrounded by coil. The armature is covered by a valve seat to which one side of a valve plate is attached. The other side of the valve plate is connected to the membrane of the pump (5). There is a pump housing covering the pumping module (4) and a spring clip which fixes both the solenoids (7) to the valve plate.

[0017] The activation of each valve (20) depends on the position of the motor. When the motor rotates, the shaft as well rotates, and the torque thus produced moves the pleuel, which exerts a force on the membrane, thereby energizing the solenoid (7) which compresses the spring (19) and causes the suction of the AdBlue (18) from the storage tank (9). This is said to be a suction stroke. In the delivery stroke, the AdBlue (18) collected through suction enters the other valve (20) with pressure and flows into the dosing module (10) and then into the exhaust gas path (17). This is called the delivery stroke. The pumping module (4), in this scenario is said to be in delivery mode. When the engine is shut down, the AdBlue (18) flows from the dosing module (10) through one valve (20) through suction stroke and flows into the storage tank (9) via the other valve (20) through the delivery stroke. The pumping module (4), in this phase is said to be in purging mode.
[0018] Some amount of AdBlue (18) is left inside the solenoids (7) even after the purging of the AdBlue (18). The AdBlue (18) freezes below -11°C. The freezing of the AdBlue (18) at present takes place uniformly because of geometry of the housing cover (1) above the valve module (6). The AdBlue (18) expands in its volume by 10% to 12% when it freezes. So, because of the uniform freezing of the AdBlue (18), there is a scope for the solenoids (7) and their internal components to get damaged. In the present scenario, the freezing of the AdBlue (18) starts from the side of the membrane (24) towards the solenoids (7) leading to the exertion of force of the AdBlue (18) on the solenoids (7).

[0019] In order to prevent damage of the internal components of the solenoids (7), in the present invention the housing cover (1) of the supply module is modified. The housing cover (1) is adapted to cover internal components of the supply module (2), said supply module (2) comprising a pumping module (4) having a pump (5) connected to a valve module (6), said valve module comprises two solenoids (7). The supply module is characterized by the housing cover (1) in the operative configuration, that has a geometric profile (8) in relation to the location of said geometric profile (8) and said solenoids (7) of said valve module (6). The geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and said valve module (6) is reduced. The geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and said solenoids (7) of said valve module (6) is reduced. Figure 3 discloses the housing cover (1) with the geometric profile (8).
[0020] The present invention also discloses a supply module (2) of a Selective Catalytic Reduction (SCR) system (3), said supply module (2) comprises a housing cover (1) enclosing a pumping module (4), a pumping module (4) having a pump (5) connected to a valve module (6), said valve module (6) further comprises of two solenoids (7). The supply module is characterized by the housing cover. In the operative configuration, said housing cover (1) has a geometric profile (8) in relation to the location of said geometric profile (8) and said valve module (6). The geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and said valve module (6) is reduced. The geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and said solenoids (7) of said valve module (6) is reduced.

[0021] The present invention further discloses a Selective Catalytic Reduction (SCR) system (3) of a vehicle comprises a storage tank (9), a dosing module (10) and at least a supply module (2). The system is characterized by said supply module (2) comprising a pumping module (4) and a housing cover (1), said pumping module (4) comprising: a pump (5) connected to a valve module (6), said valve module (6) further comprising two solenoids (7). The housing cover (1) in the operative configuration, has a geometric profile (8) in relation to the location of said geometric profile (8) and said solenoids (7) of said valve module (6). The geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and said valve module (6) is reduced. The geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and said solenoids (7) of said valve module (6) is reduced.
[0022] The claimed geometric profile (8) of the housing cover (1) of the supply module (2) of the Selective Catalytic Reduction (SCR) system helps in the reduction of the air gap between the housing cover (1) of the supply module (2) and the solenoids (7) of the valve module (6) inside the pumping module (4) of the supply module (2). In case of temperature below -11°C, the AdBlue (18) in the pumping module (4) freezes. This helps in preventing the potential damage that can be caused to the internal components of the solenoids (7) due to the pressure exerted by the AdBlue (18) on them when it freezes below -11°C.

[0023] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.
, Claims:We claim:
1) A housing cover (1) of a supply module (2) of a Selective Catalytic Reduction (SCR) system (3),
- the housing cover (1) adapted to cover internal components of a supply module (2),
- said supply module (2) comprising a pumping module (4) having a pump (5) connected to a valve module (6),
- said valve module comprising two solenoids (7),
characterized in that:
- in the operative configuration, the housing cover has a geometric profile (8) in relation to the location of said geometric profile (8) and said valve module (6).

2) The housing cover (1) as claimed in claim 1, wherein the operative configuration, the housing cover has a geometric profile (8) in relation to the location of said geometric profile (8) and solenoids (7) of said valve module (6).

3) The housing cover (1) as claimed in claim 1, said geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and said valve module (6) is reduced.

4) The housing cover (6) as claimed in claim 2, said geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and solenoids (7) of valve module (6) is reduced.

5) A supply module (2) of a Selective Catalytic Reduction (SCR) system (3), said supply module (2) comprises:

- a housing cover (1) enclosing a pumping module (4);
- a pumping module (4) having a pump (5) connected to a valve module (6);
- said valve module (6) further comprises of two solenoids (7);
characterized in that:
- in the operative configuration, said housing cover (1) has a geometric profile (8) in relation to the location of said geometric profile (8) and said valve module (6).

6) The housing cover (1) as claimed in claim 5, in the operative configuration, the housing cover has a geometric profile (8) in relation to the location of said geometric profile (8) and the solenoids (7) of the valve module (6).

7) The housing cover (1) as claimed in claim 5, said geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and the valve module (6) is reduced.

8) The housing cover (6) as claimed in claim 6, said geometric profile (8) is located in such a way that the air gap between the geometric profile (8) in relation to the location of said geometric profile (8) and the solenoids (7) of the valve module (6) is reduced.