CLIAMS:I claim:
1. An air system (10) for an internal combustion engine (12), said air system (10) comprising at least
an air intake path (14) adapted to receive air from a plurality of sources and supply said air to said internal combustion engine (10);
an air charging device (16) located in said air intake path (14) such that at least a part of said intake air is charged by said air charging device (16);
characterized in that
a flap (18) located upstream of said air charging device (16), said flap adapted to be operated directly by a driver through a linkage (20) with an accelerator (22).
2. The air system (10) as claimed in claim 1, wherein said flap (18) adapted to be operated directly by said driver in manner such that when said accelerator (22) is operated, at least a portion of said intake air is sent to the air charging device (16) for charging the air.
3. The air system (10) as claimed in claim 1 or 2, wherein said charging of air is increasing pressure of the air that is sent to said internal combustion engine (12).
4. The air system (10) as claimed in claim 1, wherein said air charging device is a supercharger.
5. The air system (10) as claimed in claim 1, wherein said flap (18) adapted to be operated directly by said driver in a manner such that when said accelerator (22) is operated, said flap (18) is proportionally opened.
6. The air system (10) as claimed in claim 1, wherein said flap (18) adapted to be operated directly by said driver in a manner such that when said accelerator (22) is operated, said flap (18) is proportionally closed.
7. The air system (10) as claimed in claim 1, wherein said air charging device (16) comprises a bypass path (24).
8. The air system (10) as claimed in claim 2 and 7, wherein said flap (18) adapted to be operated directly by said driver in a manner such that when said accelerator (22) is operated, at least a portion of said intake air is sent through the bypass path (24).
9. The air system (10) as claimed in claim 1, wherein said air system (10) comprises an exhaust gas recirculation path (26) which in flow communication with said air intake path (14) and an air exhaust path (28).
10. The air system (10) as claimed in claim 1, wherein said internal combustion engine (12) is a single cylinder or a two cylinder naturally aspirated internal combustion engine (12) ,TagSPECI:The following specification particularly describes the invention and the manner in which it is to be performed.

Field of the invention
[001] This disclosure relates to an air system for an internal combustion engine

Background of the invention:
[002] There are various mechanical superchargers for engine boosting existing. There are roots chargers, vane types or types based on centrifugal forces. Some of the today’s superchargers are switchable as well, in order not to permanently pressurize the inlet air when the engine doesn’t need it and to avoid therefore an unnecessary loss in engine power. The bypass of the charger is usually done by an electrically controlled bypass valve. For one cylinder naturally aspirated engines particularly in full load the value of lambda gets critical. The need of the industry is a cost effective solution which will provide higher lambda values in full load engine operating conditions. In particular for countries such as India where BS3 and BS4 emission certification are becoming mandatory cost efficient solution which provide higher lambda values are required to have more safety margin in emission certification tests. Further considering that certification cycles are very often carried out in full load engine operating conditions, such cost efficient solutions of full load engine operating conditions are necessary.

[003] A European patent publication numbered EP3414254 discloses an air system for an internal combustion engine. The internal combustion engine here in a four-cylinder gasoline engine. The air system comprises a supercharger which is driven through a wheel provided on the engine which is coupled to another wheel on the supercharger. Between the wheel on the engine and the supercharger a vario-transmission mechanism is provided which allows to reduce the speed of the supercharger. There is also provided a linkage from the accelerator pedal to a throttle valve in the air intake path. The pressing of the accelerator pedal ensures that the quantity of air sent to supercharger can be varied. During some operating points the air sent to the supercharger can be completely stopped. However, during such operating points there is no possibility to divert any air from the intake path.

Brief description of the accompanying drawings:
[004] An embodiment of the disclosure is described with reference to the following accompanying drawings;
[005] Figure 1 illustrates an air system for an internal combustion engine in accordance with this disclosure.

Detailed description of the embodiments:
[006] Figure 1 illustrates an air system for an internal combustion engine in accordance with this disclosure. The air system 10 for an internal combustion engine 12 comprising at least an air intake 14 adapted to receive air from a plurality of sources and supply air to the internal combustion engine 12. The air charging device 16 located in the air intake 14 such that at least a part of the intake air is charged by the air charging device 16. The air system is characterized such that a flap 18 is located upstream of the air charging device 16. The flap 18 adapted to be operated directly by a driver through a linkage 20 with an accelerator 22.

[007] In one embodiment of the air system 10 the linkage 20 is connected to accelerator pedal in case of a four wheeler. In one embodiment of the air system 10 the linkage 20 is connected to the hand operated accelerator for example in case of three wheeler or other vehicle which have a hand operated accelerator. For the purposes of the foregoing disclosure we consider the implementation of the air system 10 on a four wheeler which has an accelerator pedal as seen in figure 1. The air system as shown in figure 1 can be explained further as follows. The internal combustion engine 12 is adapted to receive air through the air intake path 14 and the exhaust gases are also sent out through the exhaust gas path 28. There is also provided an exhaust gas recirculation path 26 which is in flow communication with the air intake path 14 and the exhaust gas path 28. The air system 10 comprises an air charging device 16 which is a supercharger. The air charging device i.e. supercharge 16 is located in the air intake path 14. The supercharger is located downstream from the location where the exhaust gas recirculation path 26 is in flow communication with the air intake path 14. There is also provided a flap 18 located upstream of the supercharge 16 but downstream from the location where the exhaust gas recirculation path 26 is in flow communication with the air intake path 14. Thus the supercharger is adapted to receive at least a mixture of fresh air and recirculated exhaust gas. The supercharger also has a bypass path 24. Further the flap 18 can be directly operated by the driver through a linkage 20 to the accelerator pedal. In one of the embodiment of the linkage 20 between the accelerator pedal 22 and the flap 18, the linkage 20 comprises a set on components such as a main rod 30, a link element 32 and link rod 34. The main rod 30 is such that one end of the main rod 30 is at least in contact with the accelerator pedal 22 and other end of the main rod 30 is at least in contact with the link element 32. The link rod 34 is such that one end of the link rod 34 is at least in contact with the link element 32 while the other end is fitted to the flap 18. The point of contact of the main rod 30 to the link element 32 and the point of contact of the link rod 34 and the link element 32 may be different points on the link element 32. It must be understood that the components of the linkage 20 can be realized in many other forms which is envisaged as a part of this disclosure.

[008] Thus whenever the driver of the vehicle presses the accelerator pedal 22 the flap is directly operated through the linkage 20 and all the components of the linkage. The flap 18 is adapted to be operated directly by driver in manner such that when the accelerator pedal 22 is pressed at least a portion of the intake air is sent to the air charging device 16 for charging the air i.e. increasing the pressure of air delivered to the internal combustion engine 12. The flap 18 is adapted to be operated directly by the driver in a manner such that when the accelerator pedal 22 is pressed the flap 18 is proportionally opened. The flap 18 is adapted to be operated directly by the driver in a manner such that when the accelerator pedal 22 is pressed the flap 18 is proportionally closed. The flap 18 is adapted to be operated directly by the driver in a manner such that when the accelerator pedal 22 is pressed at least a portion of the intake air is sent through the bypass path 24.

[009] The working of the air system 10 and the operation of the flap 18 and the supercharger 16 can be explained as follows. For the purposes of this explanation we consider the above construction of the linkage 20 which is fitted to the accelerator pedal 22 and the flap 18. As mentioned earlier the linkage 20 comprises a main rod 30, a link element 32 and a link rod 34. Thus when the driver or user of a vehicle with this type of an air system installed, presses the accelerator pedal 22, the main rod 30 whose one end is fitted to the accelerator pedal 22 is pressed. This causes the main rod 30 to translate in a direction along the movement of the accelerator pedal 22. The translatory movement of the main rod 30 causes link element 32 to translate. The translation of the link element 32 causes a translator movement of the link rod 34. The translatory movement of the link rod 34 causes the flap 18 to rotate. The rotation of the flap 18 ensures that the air intake to the bypass path 24 of the supercharger 16 is stopped and maximum quantity of the intake air is sent to the supercharger 16. As mentioned earlier the realization of the flap 18 and the linkage 20 can be done such that the flap can either be proportionally opened or closed. There is also a possibility of another implementation of the flap 18 and linkage 20 such that when the linkage is operated through the accelerator pedal 22, the flap either completely closes or completely opens.

[0010] The air system 10 with the flap 18 in accordance with this disclosure is for a single cylinder or a two cylinder naturally aspirated engine 12. The main advantages of this type of an air system is that in full load the supercharger 16 is not bypassed and usually bypassed in part load or low load operating conditions of the internal combustion engine. Thus the air is pressurized by the supercharger only when required and any unnecessary losses in the engine power are avoided.
[0011] 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.