Turbulent jet controlled diffusion combustion engine

An injection method, comprising:

• providing fuel to a dual needle injector disposed on a cylinder of an engine, the cylinder comprising a passive prechamber having a spark plug and in fluid
• communication with a main chamber of the cylinder via one or more passive prechamber holes, the dual needle injector comprising a low flow needle and a high flow needle that are concentric to each other and form an annular chamber with respect to an internal wall of the dual needle injector, wherein the fuel is provided into the annular chamber;
• activating a low flow needle solenoid to move the low flow needle along a longitudinal direction to open a low flow injector nozzle disposed at an injector tip of the dual needle injector;
• injecting, in response to opening the low flow injector nozzle, a low flow fuel spray from the annular chamber through the low flow injector nozzle toward the one or more passive prechamber holes to enrich a relative fuel/air ratio of a fuel mixture inside the passive prechamber;
• activating a high flow needle solenoid to move the high flow needle along the longitudinal direction to open one or more high flow injector nozzles disposed at the injector tip of the dual needle injector;
• and
• injecting, in response to opening the high flow injector nozzle, a high flow fuel spray from the annular chamber through the one or more high flow injector nozzles into the main chamber,
• wherein the low flow needle solenoid and the high flow needle solenoid are activated independent of each other to independently control respective injection timing and injection duration of the low flow fuel spray and the high flow fuel spray.

A dual needle injector disposed on a cylinder of an engine, comprising:

• a low flow needle fluidly connected to a low flow injector nozzle disposed at an injector tip of the dual needle injector for injecting a low flow fuel spray;
• and
• a high flow needle fluidly connected to one or more high flow injector nozzles disposed at the injector tip for injecting a high flow fuel spray,
• wherein the low flow needle is coaxial with the high flow needle and moves along a longitudinal direction inside the high flow needle.