Claims:Claims Consists of an -
1. Mechanism to convert four stroke engine into two stroke which includes a
a) Directional control valve arrangement consisting of dual slider piston connected through a rod and being mounted on cylinder block. Following parts are at least not required-
• cooling jackets,
• radiator assembly,
• spark plugs,
• carburetor,
• throttle,
• cylinder head including Cam
• complex fuel injection systems
• silencer and other associated parts.

b) Offset provided to the crankshaft end which is connected through a link to one end of a Lever and the other end of the lever being connected back to directional control valve piston arrangement.
2. Engine as described in Claim 1 (having a directional control valve) whose one end is connected to the engine block and the other end is connected to an auxiliary storage vessels containing compressed air through a flow control valve which can be controlled using sensors or governor.
3. Apparatus which has following parts –
a) Compressor
b) Buffer Tank
c) Water Condensate Remover
d) Pressure Tank
e) Pressure Regulator
f) Ball Valve
g) Flow Meter
h) Engine
i) Torque Sensor
j) Electromagnetic Brake
k) Tachometer
l) Cylinder Prr. Sensor

4. Directional Control Valve in Claim 1 is having Crankshaft to slider axis distance of 8.5”. Connecting rod to exhaust side slider as 1.26”. Lever arm length 1.5” connected to an offset of crankshaft (1mm) through a link of 6” for maestro Engine used.

5. A retrofit kit installed in the old engine consisting of following parts to convert the conventional engine into Air Driven Engine-
• An air entering arrangement in the cylinder.
• Auto Cutoff mechanism for air while entering the cylinder during stroke movement
• Compressor to supply the compressed air which is getting powered using electricity.
• Storage vessel to store the high pressurized air.
• Hose supply to connect the engine with storage tank.
• Utility items for checking process conditions like flow meter, pressure gauge, flow regulation valves.
• Performance analyzing device like tachometer, torque analyzer
6. The kit of Claim 5 consisting of an auto cutoff mechanism which comprises of a directional control valve fitted with two sliders & a rod or a solenoid valve using sensor.
7. Claim 6 further consist of an arrangement for connecting directional control valve to the crankshaft for movement according to the stroke, which consist of offset as described in Claim 1.
8. A Vehicle comprising of a Engine as described in Claim 1, Air Tank for air storage, retrofit kit as per Claim 5
9. A cycle showing the theoretical & actual P-V representation of various processes undergone in a compressed air engine considering air as the system.
, Description:For running a compressed air engine, we require two strokes (one power stroke and the other exhaust stroke). So we require to modify a four stroke engine into a two stroke engine. The modification can be carried out by change in cam profile and gear ratio. But changing the cam profile to desired accuracy is difficult and also doesn’t provide a way to use the old vehicles as air driven vehicles post their retirement phase with the same setup. So the alternate route was developed by working out a mechanism to convert four stroke engine to two stroke. The other advantage adopting this method being with the minimal modifications required outside the engine, therefore allowing to deploy same assembly line with minimal changes for the two engines (conventional and air driven engine). Thus, cutting down on the cost of production. As shown in the figure 3 an offset has been provided to the crank which is further connected with the bell crank lever in order to transmit the rotational movement of the crankshaft into the linear movement of directional control valve to regulate the supply line.

Using kinematic and dynamic motion study followed by practical optimization, the final dimensions have been calculated for the mastero four stroke 100cc engine, shown in the figure 4. For, other engines also it will work off-course with either same or different dimensions (which can be found using geometric similarity). However, the concept will be same. In this way, by limiting the distance between the direction control valve pistons and their distance from the piston bore center, we can ensure that the inlet/outlet port will be open to compressed air when piston is at TDC and will be open to exhaust pipe when piston is at BDC which will provide us with 2 stroke functioning of engine.

In this study, theoretical cycle analysis of air engine on P-V Diagram and successful test run have been carried out by modifying a conventional four stroke 100cc engine (without changing cam profile). Thus proving the way for using I.C. Engines as Compressed Air driven Engine on the same assembly line by removing :-
• cooling jackets,
• radiator assembly,
• spark plugs,
• carburetor,
• throttle,
• complex fuel injection systems
• silencer and other associated parts.
• Cam Assemly
• exhaust manifolds;
• Intake Manifold
• Cylinder Head
• muffler
• catalytic converter
• Distributor
• coil
• fuel assemblies
• radiator
• cooling fan
• fan clutch
• thermostat.

With present modifications, a maximum RPM of 1527 was observed at a pressure of 9 Bar. Overall efficiency of the engine is although not very high because of high inertia forces of the parts designed to operate conventional I.C. Engines, but it can be improved by using light weight material since the load requirements are not high. RPM is found to be a direct function of pressure, but going beyond a pressure limit poses its own problem, hence restricting the maximum speed of the engine. The exhaust from the engine is comparatively at a dip of up to 3ºC with respect to atmosphere because of expansion and can be used in air conditioning system also, thus helping in further improve the efficiency. These types of engine can be used for LMV’s and for higher speed and performance, hybrid can prove to be a viable option specially with gaseous fuels for utilizing the pressure energy in driving the air engine and chemical energy for conventional working

While the discussions shows that the Conventional S.I Engine is being converted to the air driven engine. Although this mechanism holds good or can be implemented in alone or in hybrid wherever required to convert any of the engines known presently or being developed in the future.