Combined fuel engine

Claim 1

A combined fuel engine for reduced emission pollution comprising: a cylinder with at least one piston reciprocal therein with a cycle having at least a compression stroke and a power stroke, the cylinder and piston forming in part a combustion chamber, an air intake port and a combustion gas exhaust port communicating with the combustion chamber, first fuel injection means with a first fuel supply for injecting a first conventional fuel from the high carbon group including gasoline and diesel oil stored in the first fuel supply into the combustion chamber proximate the cycle time of peak compression at the end of the piston compression stroke, and second fuel injection means with a second fuel supply for injecting a second auxiliary fuel from the high hydrogen group including methanol, ethanol and liquefied natural gas stored in the second fuel supply into the intake port of the combustion chamber proximate the cycle time of low compression at the beginning of the piston compression stroke after the exhaust port is closed, the second fuel supply including a fuel supply line to the intake port that includes means for cooling hot areas of the engine while preheating the fuel before injection into the combustion chamber, means for varying the proportion of fuel injection from the first fuel injection means from 100% to 5% of fuel required for a lean combustible mixture and concurrently varying the fuel injected from the second fuel injector means to provide a fuel charge that provides the balance of fuel required for such lean combustible mixture wherein the fuel charge from the second fuel injector means is maintained sufficiently lean to prevent premature detonation, wherein detonation results upon injection of fuel by the first injection means.