BigPatents India

A control system for adjusting levels of emissions exiting an engine includes a NOx sensor that generates a NOx signal in response to oxides of nitrogen (NOx) in an exhaust gas and a control module that communicates with the cam phaser. The rotational position of the cam phaser controls an actuation time when the camshaft opens the exhaust valve during rotation of the camshaft. The control module further receives the NOx signal, and calculates a NOx level of the exhaust gas based on the NOx signal. The control module compares the NOx level to a predetermined threshold range and adjusts the cam phaser to achieve a rotational position that releases a desired level of NOx from the engine when the NOx level exceeds the predetermined threshold range. The control module further stores the rotational position in a storage device when the NOx level is within the predetermined threshold range. No. of Pages : 14 No. of Claims : 12