Patent ID: 6550430
Filing Date: 2003-04-22
Classification: F02B,F02D,Y02T

Abstract:
A method for operating a reciprocating internal combustion engine of the piston-in-cylinder type, characterized by the steps of:a) supplying a vaporized fuel/air mixture to a combustion chamber of the engine, said mixture including a high octane fuel; b) injecting pilot fuel, in the form of a high cetane fuel, directly into the combustion chamber to cause ignition of said fuel/air mixture, said combustion chamber being directly in communication with the piston, said pilot fuel being injected in such conditions as to form multiple flame fronts between the high cetane fuel and said fuel/air mixture but without auto-ignition of said fuel/air mixture itself; wherein said high cetane fuel has a cetane value of at least 100 and wherein the amount of said high cetane fuel is less than 10% of the fuel requirements of the engine.