Fuel injection control device and method of diesel engine

摘要

A fuel injection control device provided with: a standard fuel injection timing setting unit 41 which previously sets a standard fuel injection timing with respect to engine speed and fuel injection quantity; an injection penetration judging unit 45 which judges whether or not the penetration of the fuel atomization in a cylinder is in an increasing condition, by use of at least one out of a detected ambient pressure from an ambient pressure sensor, an estimated cylinder pressure at an injection start timing, and an estimated ignition delay from an injection start timing to a combustion start timing; and a fuel injection timing correction unit 43 which corrects the fuel injection timing toward an advanced timing angle and constrains the penetration of the fuel atomization, in a case where the penetration judging unit judges that the penetration of the fuel atomization is in an increasing condition.

主权项

1. A fuel injection control device of a diesel engine including a fuel injection valve which injects a fuel into a combustion chamber and a fuel injection timing control unit which controls a fuel injection timing of the fuel from the fuel injection valve, the fuel injection control device comprising:
a standard fuel injection timing setting unit which previously sets a standard fuel injection timing with respect to engine speed and fuel injection quantity; a penetration judging unit which judges whether or not fuel spray penetration in a cylinder is in an increasing condition, by using an estimated cylinder pressure at an injection start timing; and a fuel injection timing correction unit which, by correcting the standard fuel injection timing toward an advanced timing angle, constrains the fuel spray penetration when the penetration judging unit judges that the fuel spray penetration is in an increasing condition, wherein the estimated cylinder pressure at the injection start timing is computed based on pressure in an intake manifold, and wherein the penetration judging unit judges that the fuel spray penetration in the cylinder is in an increasing condition when the estimated cylinder pressure is lower than a standard cylinder pressure at the injection start timing according to the standard fuel injection timing.