Advanced science.  Applied technology.


Use of a Variable Valve Actuation System to Control the Exhaust Gas Temperature and Space Velocity of Aftertreatment System Feedgas: 6,948,310


A method for controlling the temperature and/or space velocity of exhaust gas passing through an aftertreatment device disposed in the exhaust system of a diesel engine provides an optimal environment for efficient conversion of NOx and undesirable emissions during transient and steady state engine operation. The method includes controlling intake and/or exhaust valve timing, either singly or in combination with fuel injection timing and selective individual cylinder cutout, in response to sensed engine operating parameters.

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Charles E. Roberts Jr.; Andrew C. Mathaeus; David P. Branyon; Rudolf H. Stanglmaier; Lee G. Dodge; Thomas W. Ryan III; Daniel W. Stewart