Abstract: A closed loop control fuel injection method allows an injection amount and injection timing to be obtained, in such a way that an HRR (Heat Release Rate) is calculated from a combustion pressure signal of a combustion pressure sensor after a related pilot fuel amount is injected in a state in which an engine is warmed up, and to be adjusted according to command values, thereby removing inaccuracy of closed loop calibration and risks due to the excess of EM control caused when simply using a combustion pressure diagram, through predefined stable conditions.

Abstract: An injector apparatus for an engine, may include an injector body, an actuator mounted in the injection body, a rotary rod rotatably received in the injector body and selectively rotated by the actuator, wherein a fuel groove may be formed on outer surface of the rotary rod along a longitudinal direction thereof, and a nozzle hole formed at a nozzle of the injector body to selectively communicate with the fuel groove in accordance with rotation of the rotary rod, wherein the rotary rod slidably contacts with the nozzle in the injector body.

Abstract: An injector hole structure for an engine, may include an inlet portion and an outlet portion, a wall narrowing from the inlet portion to the outlet portion, and a tumble generating protrusion protruding from an inner surface of the wall toward a center axis of the wall and having a concentric circular shape with the inlet portion or the outlet portion or a tumble generating groove depressed on an inner surface of the wall away from a center axis of the wall and having a concentric circular shape with the inlet portion or the outlet portion.

Abstract: An injector apparatus for an engine, may include an injector body, an actuator mounted in the injection body, a rotary rod rotatably received in the injector body and selectively rotated by the actuator, wherein a fuel groove may be formed on outer surface of the rotary rod along a longitudinal direction thereof, and a nozzle hole formed at a nozzle of the injector body to selectively communicate with the fuel groove in accordance with rotation of the rotary rod, wherein the rotary rod slidably contacts with the nozzle in the injector body.