Patent ID: 7398773
Filing Date: 2008-07-15
Classification: F02B,F02D,F02M,F04D,Y02T

Abstract:
1. A method of EGR recovery comprising: calculating a transient volume of EGR sufficient to maintain NOx emitted by an engine below a predetermined level during a period of transient operation of said engine; supplying an actual volume of EGR during said period of transient operation; measuring said actual level of EGR during said period of transient operation; calculating an EGR deficit between said transient volume of EGR and said actual volume of EGR during said period of transient operation; integrating said EGR deficit over said period of transient operation to calculate a deficit volume of EGR; calculating a following steady-state volume of EGR sufficient to maintain NOx emitted by said engine below said predetermined level during a following period of substantially steady-state operation of said engine; and supplying said following steady-state volume of EGR plus said deficit volume of EGR during said following period of substantially steady-state operation of said engine.