Compressed air engine

A method comprising:

• providing a source of compressed air;
• operating an engine with the compressed air by communicating the compressed air to the engine to reciprocate a piston in a chamber from bottom dead center to top dead center in a reciprocal manner or from top dead center to bottom dead center in a reciprocal manner without combustion, comprising:
• detecting position of said piston in said chamber;
• controlling the opening and closing of a first valve and a second valve based on said detected position of said piston in said chamber;
• the air traversing from the source of compressed air into the chamber by opening the first valve, wherein both the first valve and second valve are closed and the compressed air moves the piston in the chamber to produce work, the second valve opening and the air escaping from the chamber.

A lawn mower comprising:

• a blade being coupled to a drive shaft;
• an engine being connected to the drive shaft for rotating the drive shaft;
• a tank of compressed air;
• the tank of compressed air being connected to a conduit, the conduit being connected to a cylinder of the engine, the engine comprising a first valve and an inlet to a chamber;
• the chamber comprising a piston and a second outlet being connected to a second valve;
• an electric circuit configured for electronically opening and closing said first valve and said second valve, wherein said electric circuit opens and closes said first valve and said second valve based on position of said piston in said chamber, and wherein sensors installed at a top dead center and at bottom dead center of said chamber provide said electric circuit with said position of said piston in said chamber;
• and
• the air traversing from the tank of compressed into the chamber by opening the first valve, wherein both the first valve and second valve are closed and the compressed air moves the piston in the chamber to produce work to rotate the drive shaft and to rotate the blade, the second valve opening and the air escaping from the chamber and the piston, wherein no combustion occurs in the cylinder and the piston reciprocates from the compressed air moving the piston.