Claims:We Claim:
1. A supercharger (100), said supercharger (100) located upstream to an engine (102), a first flow path (104) from said supercharger (100) in flow communication with said engine (102); characterized in that:
a second flow path (106) from said supercharger (100) in flow communication with a dosing injector (108), said dosing injector (108) located along an exhaust path (110); and
flow of air through said second flow path (106) controlled by a flow control valve (112).

2. The supercharger of claim 1, wherein said flow control valve is controlled by a dosing control unit.

3. A system (200) for injecting urea solution into a dosing injector (204); said system comprising:
a supercharger (206) ;
at least a first flow path (208) and a second flow path (210) from said supercharger (206), said second flow path(210) in flow communication with a dosing injector (204) located along an exhaust path (205);
and
a control valve (212) located in said second flow path (210), said control valve (212) adapted to regulate flow of air from said supercharger (206) into said dosing injector (204).

4. The system (200) of claim 3, wherein said second flow path (210) is in flow communication with an engine (202). , Description:Field of the invention
[0001] This invention relates to the field of supercharger.

Background of the invention
[0002] A supercharger is used to increase the mass flow rate of air supplied to an engine. In the case of a single cylinder engines, space constraint of components is an issue along with meeting stringent emission norms. Known in the art for meeting emission regulations are systems like Nox storage catalyst (NSC), diesel particulate filter (DPF) and Selective catalytic reduction (SCR) and exhaust gas recirculation systems (EGR). For single cylinder engines used in three wheeler segment the SCR system and supercharger technology is mandatory to meet BS6 emission norms. Hence there is a need to use the existing mass flow of air from supercharger to meet the emission norms.

Brief description of the accompanying drawing
[0003] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:
[0004] FIG. 1 illustrates a supercharger; and
[0005] FIG. 2 illustrates device for injecting urea solution into a dosing injector.

Detailed description of the embodiments
[0006] FIG. 1 illustrates a supercharger 100. The supercharger 100 is located upstream to an engine 102, a first flow path 104 from the supercharger 100 is in flow communication with an engine 102. The supercharger 100 is characterized in comprising a second flow path 106 from the supercharger 100 in flow communication with a dosing injector 108, the dosing injector 108 is located along an exhaust path 110 and flow of air through the second flow path 106 is controlled by a flow control valve 112. The flow control valve 112 is controlled by a dosing control unit.
[0007] The working of the supercharger 100 will now be explained. The primary function of the supercharger 100 is to supply air to the engine 102. The air from the supercharger flows into the engine 102 through the first flow path 104. This air mixes with fuel during the combustion process in the engine 102. The air supplied by the supercharger 100 increases the power output from the engine 102. In addition a second flow path 106 is provided from the supercharger 100. The second flow path 106 enables air from the supercharger 100 to flow into the dosing injector 108. The dosing injector is used to inject urea solution into the exhaust stream during selective catalytic reduction (SCR) process. This injection process helps in reducing Nox from the exhaust. The flow of air into the dosing injector 108 is controlled by a flow control valve 112. The flow control valve 112 is located along the second flow path 106. The flow control valve 112 receives input from a dosing control unit (DCU) whenever there is a requirement for injecting urea solution into the exhaust path 110. This flows control valve 112 opens the second flow path 106 in order for the air to flow from the supercharger into the dosing injector 108. The pressurized air is used to inject urea solution into the exhaust path in the form of spray particles. When the requirement for dosing is not required, the flow control valve blocks the flow of air from the supercharger into the dosing injector. Thus the air flows only from the supercharger 100 into the engine 102.
[0008] FIG. 2 illustrates a system for injecting urea solution into a dosing injector 204. The system comprises a supercharger 206. The supercharger 206 comprises at least a first flow path 208 and a second flow path 210. The second flow path 210 is in flow communication with a dosing injector 204, and a flow control valve 212 is located in the second flow path 210. The flow control valve 212 is adapted to regulate flow of air into the dosing injector 204. The second flow path 210 is in flow communication with an engine (202). The system as disclosed in FIG. 2 enables the supercharger 206 to deliver compressed air to two different components. The first component is the engine 202 that requires increased mass of air to give higher power output. The second component here is the dosing injector 204. The dosing injector 204 injects urea into the exhaust path 205. The air from the supercharger flows into the dosing injector for enabling air supported urea dosing into the exhaust path 205.
[0009] The usage of the supercharger as pressure generator for air supported selective catalytic reduction (SCR) system is a very cost convenient system approach. The existing SCR supply module may be avoided. The supercharger is anyway needed for meeting BS6 norms. The advantages of the air supported SCR system can be especially used in the vehicles with single cylinder engines. These are: spray quality for critical applications (low temperature) and mainly the flexibility of dosing position due to space constraints in this kind of vehicles.
[0010] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention in terms of the type of supercharger used. 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.