Method and system for internal combustion engine

Abstract

It is disclosed a method for operating an improved internal combustion engine. An intake valve and an exhaust valve control closing and opening of respective intake and exhaust apertures. The engine includes a separating aperture between the cylinder and a separation chamber, and a controlling separating valve. The separation chamber is connected to the intake and exhaust manifolds respectively by the intake and exhaust apertures. The method includes opening the separating valve. While it is open, the exhaust valve opens and then closes, and then the intake valve opens enabling gas flow from the intake manifold to the cylinder volume through the open intake aperture, the separation chamber and the open separating aperture. The method includes closing the intake valve and closing the separating valve. Thereby, gas flow from the intake manifold stops, isolating the separation chamber from the cylinder volume and providing double isolation during compression and combustion strokes.

1 . A method for operating an improved internal combustion engine unit, the engine unit having a piston moving in a cylinder enclosing cylinder volume, an intake valve controlling closing and opening of an intake aperture connecting the cylinder volume to an intake manifold, and an exhaust valve controlling closing and opening an exhaust aperture connecting the cylinder volume to an exhaust manifold, the improved engine unit further comprising a separating aperture between the cylinder and a separation chamber, and a separating valve for controlling closing and opening said separating aperture, the separation chamber being connectable to the intake manifold and to the exhaust manifold respectively by the intake and exhaust apertures, the method of operating the improved engine unit comprising:
 (a) opening said separating valve and while said separating valve is open:   (i) opening the exhaust valve, enabling combusted gas flow from the cylinder volume to the exhaust manifold through the open separating aperture, the separation chamber and the open exhaust aperture;   (ii) closing said exhaust valve for stopping said combusted gas flow; and   (iii) opening the intake valve, enabling gas flow from the intake manifold to the cylinder volume through the open intake aperture, said separation chamber and said open separating aperture, and;   and   (b) closing said intake valve and closing said separating valve,   thereby stopping gas flow from said intake manifold, isolating said separation chamber from the cylinder volume during compression and combustion strokes, and providing double isolation of said intake manifold and said exhaust manifold from the cylinder volume during compression and combustion strokes.   
     
     
         2 . The method of  claim 1  wherein said opening and said closing of said separating valve is effected by a camshaft 
     
     
         3 . The method of  claim 1  wherein said intake valve and of said exhaust valve are driven by one or more electrical mechanisms. 
     
     
         4 . The method of  claim 3  wherein at least one electrical mechanism of said one or more electrical mechanisms operates in accordance with one or more indications of the engine unit operational parameters, the indications received from one or more sensors associated with the engine unit. 
     
     
         5 . The method of  claim 3  wherein at least one valve of intake valve and exhaust valve is controlled to effect air pressure in accordance with engine revolutions rate. 
     
     
         6 . An internal combustion engine unit having at least one valve driven by a camshaft associated by a pulley system to a crankshaft, said pulley system determining a ratio of 1:4 between camshaft rotations and respective crankshaft rotations.