Vibration and emissions quantification over key drive cycles using cylinder deactivation

Abstract

Cylinder deactivation has been shown to provide higher grade heat to improve diesel aftertreatment performance during low load operation while providing a fuel and CO2 savings. This paper evaluates engine and aftertreatment performance along with engine vibration over eight drive cycles in a dynamometer test cell. The eight drive cycles include the heavy-duty federal test protocol, low load cycle, Orange County Transit Authority bus cycle, New York bus cycle, Air Resource Board cycle and a portion of the 55-mph cruise cycle. Results show the tailpipe NOx and CO2 reduction along with both linear and torsional vibration to quantify NVH. The emission results were quantified using both conventional and close-coupled aftertreatment systems. The linear vibration from the engine during CDA was generally consistent with normal operation; thus, removing NVH as a barrier for implementation. Adding a low NOx aftertreatment system to the CDA engine showed emission levels within proposed future regulations.