Patent ID: 8024920
Filing Date: 2011-09-27
Classification: F01N,F02D,Y02A,Y02T

Abstract:
1. An exhaust after-treatment system for a vehicle including a dosing agent that is selectively injected into an exhaust from a dosing agent supply, comprising: a first module that determines a level of a dosing agent source; a second module that determines whether said vehicle is at a convenient location for replenishing said dosing agent source based on an oil parameter or a maintenance flag, wherein said oil parameter includes an electrical impedance, and wherein said second module determines that said vehicle is at said convenient location (i) when said electrical impedance indicates an oil change has occurred during a period after a vehicle shutdown and before a vehicle restart or (ii) when said maintenance flag indicates that vehicle maintenance has been performed during a period after a vehicle shutdown and before a vehicle restart; and a third module that selectively inhibits vehicle operation if said level of said dosing agent source is below a threshold level and said vehicle is at said convenient location.