Patent ID: 8532912
Filing Date: 2013-09-10
Classification: F02D,Y02T

Abstract:
1. An engine control system comprising: a combustion-change means which outputs a command for changing a flow rate of gas flowing into a cylinder and an injection quantity of fuel injected into the cylinder in order to change an air-fuel ratio of an exhaust gas; a concentration computing means which computes an in-cylinder oxygen concentration; a memory means which stores first values and second values of parameters of a target ignition timing, a target injection pressure, and a target pilot injection quantity, the first values being set in a case that the in-cylinder oxygen concentration is a first oxygen concentration, the second values being set in a case that the in-cylinder oxygen concentration is a second oxygen concentration which is higher than the first oxygen concentration; and a parameter value setting means which sets the values of the parameters so as to correlate to the in-cylinder oxygen concentration of during a transition period of the air-fuel ratio, the values of the parameters being obtained by an interpolation based on the first and the second values of the parameters and the in-cylinder oxygen concentration, so that a combustion noise during a transition period of the air-fuel ratio is controlled so that a variation in combustion noise is decreased.