Variable-ignition diesel-gasoline dual fuel powered combustion engine, system, and method for controlling of the same

A method for controlling a variable-ignition diesel-gasoline dual fuel powered combustion engine in which a spark plug and a diesel fuel injector are provided for a cylinder, and air or a gasoline-mixed air is introduced by way of an air intake manifold and is spark-ignited or compression-ignited in an interior of the cylinder, comprising:

• a cold driving judgment step for judging whether or not an engine is warmed up by measuring the temperature of cooling water;
• an engine operating range judgment step for judging an engine operating range of an engine based on the speed and the load of the engine when it is judged that the engine is warmed up as a result of the judgment in the cold driving judgment step;
• and
• a combustion mode application step for driving in the previously set combustion mode of the engine depending on the engine operating range determined in the engine operating range judgment step.

A variable-ignition diesel-gasoline dual fuel powered combustion system comprising:

• at least one cylinder, each cylinder being equipped with a spark plug and a diesel fuel injector, and each receiving air or a gasoline-mixed air therein;
• an electronic control unit (ECU) controlling gasoline fuel combustion, diesel fuel combustion or gasoline-diesel fuel combustion depending on an engine operating range;
• and
• an ECU controlling, by judging the engine operating range, an engine to operate with one selected among diesel fuel combustion, diesel-gasoline fuel combustion and gasoline fuel combustion depending on the engine operating range.