Patent ID: 9347359
Filing Date: 2016-05-24
CPC Classification: F01N,Y02T

Claim Text:
1. An air dithering system for an internal combustion engine generating exhaust gas, comprising: an exhaust line in exhaust gas receiving communication with the internal combustion engine; an exhaust aftertreatment component positioned within the exhaust line in exhaust gas receiving communication with exhaust gas in the exhaust line; an air injector in air injecting communication with exhaust gas in the exhaust line at a location downstream of the internal combustion engine and upstream of the exhaust aftertreatment component; and a controller in electronic communication with the air injector, the controller configured to control the air injector to inject air into the exhaust gas based on an oxygen storage demand representing a desired quantity of stored oxygen to be added to the exhaust after treatment component, the desired quantity of stored oxygen based on an estimate of oxygen already stored on the exhaust aftertreatment component, wherein the estimate of the amount of oxygen stored on the exhaust aftertreatment component is based on a maximum storage capacity of the exhaust aftertreatment component, and wherein the maximum oxygen storage capacity is calculated based on an amount of time the exhaust aftertreatment component has been operational.