Patent ID: 7779622
Filing Date: 2010-08-24
Classification: F02D,Y02T

Abstract:
1. A fuel injection control device for use with an internal combustion engine, the engine comprising a fuel injector which performs a post injection after performing a main injection into a cylinder and an exhaust valve which opens and closes to discharge an exhaust gas, the control device comprising: a programmable controller programmed to: determine a duration of the post injection using the following equation: L=breakup length=distance from injection hole to wall surface of the cylinder; C=velocity coefficient; ΔP=differential pressure between interior and exterior of injection hole; and ρƒ=density of fuel; and control the fuel injector to start the post injection during a period where a gas velocity in the cylinder along a cylinder axis increases after the exhaust valve opens and continue the post injection during the determined duration of the post injection.