Off-Highway Engine Emission Control with High System Efficiency (CRADA with John Deere Product Engineering Center)Annual Report

Abstract

Tier 3 federal standards for new off-highway diesel engines require that NOx and PM levels be regulated to 4 g/kWh and 0.2 g/kWh, respectively, for engines between 130 and 560 kW. The phase-in period for Tier 3 compliance is set to begin in 2006 and to be completed by 2008. Urea-SCR has been shown to effectively reduce NOx emissions for on-highway applications, but needs to be thoroughly evaluated for off-highway engines since both engine design and operating conditions are different. The utilization of advanced injection systems and controls are to be evaluated for improvements in both PM emissions and fuel efficiency. This project seeks to develop and evaluate emission control methodologies with the goal of identifying pathways to meet interim Tier 4 and retrofit solutions.