Claims:We claim:
1. An Air Injection System (120) for a vehicle (100), comprising a tube (104) connecting an air inlet conduit (118) of an engine (116) to an exhaust conduit (102), said tube (104) is fit with an electrical valve (106) and a reed valve (110), characterized in that
said tube (104) is positioned in said vehicle (100) in a manner to be exposed to ambient air flow.

2. The Air Injection System (120) as claimed in claim 1, wherein said tube (104) is positioned in frontal direction of said vehicle (100).

3. The Air Injection System (120) as claimed in claim 1, wherein said tube (104) is made of high heat conducting material.

4. The Air Injection System (120) as claimed in claim 2, wherein said tube (104) is made of metal.

5. The Air Injection System (120) as claimed in claim 1, wherein a portion (112) of said tube (104) from said reed valve (110) to an interface (114) between said tube (104) and said exhaust conduit (102) is exposed to ambient air flow.

6. The Air Injection System (120) as claimed in claim 5, wherein said portion (112) of tube (104) is made of metal.

7. The Air Injection System (120) as claimed in claim 1, wherein said arrangement enables high density of air flow into said exhaust conduit (102).

8. The Air Injection System (120) as claimed in claim 1, wherein said tube (104) is in proximity of a coolant of said vehicle (100).

9. The Air Injection System (120) as claimed in claim 1, wherein said tube (104) is in contact with a coolant of said vehicle (100).

10. The Air Injection System (120) as claimed in claim 1, wherein said vehicle (100) comprises a two wheeler, a three wheeler, a four wheeler and the like.
, Description:Field of the invention:
[0001] The present invention relates to an air injection system in an exhaust conduit of a vehicle.

Background of the invention:
[0002] According to an Indian patent application 201741018720, a modified exhaust system for automobiles is disclosed. The Engine Exhaust system is the main component in discharging the exhaust gases to the atmosphere and helps in reducing the emissions and noise from the engine. This project aims in improving the life of the exhaust system by modifying the catalytic converters chamber and also to increase the efficiency of oxidation catalyst from the starting time of vehicle. For increasing the life of catalytic converter, it should be cleaned periodically. Here, we pump the fresh air at sufficient temperature to increase the efficiency of oxidation catalyst during starting of the vehicle. An electric heater is wound around it to attain the sufficient conversion temperature, so that, the reduction of emission is possible from the starting time of the engine itself. The electric heater will turn on, when all the electric components inside the vehicle is turned on. The electric heater automatically cuts off the process, when the catalyst reaches the sufficient conversion temperature with the help of temperature sensor. This project is a basic prototype of the future advancement of the vehicles exhaust system.

Brief description of the accompanying drawings:
[0003] An embodiment of the disclosure is described with reference to the following accompanying drawing,
[0004] Fig. 1 illustrates an air injection system for a vehicle, according to an embodiment of the present invention.

Detailed description of the embodiments:
[0005] Fig. 1 illustrates an air injection system for a vehicle, according to an embodiment of the present invention. The vehicle 100 comprises an engine 116 with single or multiple cylinders, a throttle body (not shown), a throttle position sensor (TPS), a fuel injector (or a carburetor), an Exhaust Treatment Unit (ETU) 108 comprising a three-way catalyst, or other types of catalyst, and the like. Only few components of the vehicle 100 are listed for the purpose of explanation and clarity and the same must not be understood in limiting sense.
[0006] The vehicle 100 further comprises an air injection system 120 comprising a tube 104 connecting an air inlet conduit 118 of the engine 116 to an exhaust conduit 102. The tube 104 is fit with an electrical valve 106 and a reed valve/ one way valve 110. The tube 104 receives filtered air from the air inlet conduit 118 because of the presence of air filter, otherwise the inlet for the tube 104 can be taken directly from the atmosphere and not through the air inlet conduit 118, such as at the interface 114 of the tube 104 and the exhaust conduit 102. The Air Injection system 120 is characterized by the tube 104 positioned in the vehicle 100 in a manner to be exposed to ambient air flow. The air flow direction is shown by block arrows 122 for explanatory purpose and is not limited by the same. The air injection system 120 is also known as Secondary Air Injection (SAI). In the Fig. 1, the position of the tube 104 shown is an example to provide clarity in understanding, the same must not be understood in limiting sense.
[0007] The reed valve 110 allows flow of fluid in only one direction, i.e. the air flows into the exhaust conduit 102 and restricts the flow of exhaust gas to the air inlet conduit 118. Further, the reed valve 110 operates based on the pressure difference between the exhaust gas and the air in the air inlet conduit 118 without any pump. This is referred to as aspirated air injection due to the negative pressure pulses in the exhaust conduit 102.
[0008] The tube 104 is positioned in frontal direction of the vehicle 100. The tube 104 is positioned on top of the exhaust conduit 102 as it comes out of the engine 116 from the front as shown. The tube 104 is made of high heat conducting material. The tube 104 is made of metal. The air inside the tube 104 dissipates heat to the air outside the tube 104 due to heat conducting property of the metal, and thus cools down fast.
[0009] In accordance to another embodiment, a portion 112 of the tube 104 is exposed to the ambient air flow. The portion 112 comprises a part from the reed valve 110 to an interface 114 between the tube 104 and the exhaust conduit 102. The portion 112 of the tube 104 is made of metal. The portion 112 may be the part of the tube 104 from the electrical valve 106 to the reed valve 110 or to the interface 114.
[0010] The arrangement/ positioning enables high density of air flow into the exhaust conduit 102. Since the tube 104 or the portion 112 of the tube 104 is exposed to the ambient air flow, during idle, parked and traveling conditions, the air inside the tube 104 is cooled by the ambient air outside the tube 104. The tube 104 is made of high heat conducting material and helps in heat dissipation of the air inside the tube 104. Due to heat dissipation or cooling, the air is denser inside the tube 104 and thus more quantity or volume of air is injected by the air injection system 120 into the exhaust conduit 102. The high volume of air reacts with THC, CO and NOx and converts into environmental friendly components i.e. H2O, CO2 and N2.
[0011] In accordance to another embodiment of the present invention, the tube 104 is in proximity of a coolant of the vehicle 100. Alternatively, the tube 104 is in contact with the coolant of the vehicle 100. In still another alternative, the portion 112 is in contact or proximity of the coolant. Being in proximity or contact with the coolant of the vehicle 100, the heat dissipation of the air inside the tube 104 is increased or enhanced, making the air inside the tube 104 denser. The coolant is such as engine coolant, or coolant of an Air Conditioner System (AC). Alternatively, the tube 104 or the portion 112 of the tube 104 is provided with a dedicated cooling system other than the engine coolant.
[0012] The vehicle 100 comprises a two wheeler such as motorcycles, scooters, a three wheeler such as auto-rickshaws, a four wheeler such as car and the like.
[0013] 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.