Patent ID: 8302385
Filing Date: 2012-11-06
Classification: F01N,F02D,Y02T

Abstract:
1. An apparatus for controlling the temperature of engine output exhaust of an internal combustion engine during a regeneration event on a particulate matter filter, comprising: a regeneration module configured to determine a desired diesel oxidation catalyst (DOC) inlet exhaust temperature during a regeneration event; and an exhaust temperature manager configured to determine an air-to-fuel ratio strategy for achieving a desired air-to-fuel ratio within a combustion chamber for producing an engine output exhaust temperature approximately equal to the desired DOC inlet exhaust temperature; wherein the air-to-fuel ratio strategy comprises a first mode and a second mode, the first mode comprising varying the position of an air intake throttle valve while maintaining a VGT device in a fixed position, and the second mode comprising varying the position of the VGT device while maintaining the air intake throttle valve in a fixed position; and wherein the first and second mode of the air-to-fuel ratio strategy each comprises manipulating the timing and dosage of a post-injection of fuel into the compression cylinder.