Patent ID: 7644696
Filing Date: 2010-01-12
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method in an engine system comprising an internal combustion engine having at least one cylinder at which a piston, at least one inlet valve, at least one exhaust valve, and a fuel injector, for injection of a fuel directly into the cylinder, are provided, the method comprising performing the following steps in at least one of the cylinder: controlling the inlet valve so as to introduce air into the cylinder; performing at least one main combustion fuel injection for a main combustion with air introduced into the cylinder; controlling, during an exhaust stroke and an intake stroke, the inlet valve and the exhaust valve so as to form a negative valve overlap to capture main combustion residues; and performing at least one pilot fuel injection during the negative valve overlap; wherein the amount of fuel in the pilot fuel injection is at least partly dependent on said introduction of air and the main combustion fuel injection.