Engine with variable combustion chamber

Claim 1

An engine comprising: a cylinder; a piston slidably disposed in said cylinder; a first combustion chamber defined in said piston; a cylinder head mounted on said cylinder; a second combustion chamber defined in said cylinder head and communicating with said cylinder through a communication port; a valve mounted in said cylinder head for opening and closing said communication port; intake and exhaust passages communicating with said cylinder; a first fuel injection nozzle for injecting fuel into said first combustion chamber; a second fuel injection nozzle for injection fuel into said second combustion chamber; fuel supply means for supplying fuel to one of said first and second fuel injection nozzles at a time; valve actuating means for actuating said valve to open and close said communication port; load detecting means for detecting a load on the engine; and control means for operating said valve actuating means to open said valve and controlling said fuel supply means to supply fuel to said second fuel injection nozzle when the load on the engine as detected by said load detecting means is equal to or higher than a predetermined value, and for operating said valve actuating means to close said valve and controlling said fuel supply means to supply fuel to said first fuel injection nozzle when the load on the engine as detected by said load detecting means is lower than said predetermined value.