Advanced Diesel Technology to Achieve Tier 2 Bin 5 Emissions Compliance in US Light-Duty Diesel Applications

摘要

Future growth of the US light-duty diesel market is highly dependent on achieving cost-effective and robust emissions solutions. For this reason, ACTION (Advanced Combustion Technology to Improve engine-Out NO{sub}x) is being developed by Ricardo. This research is delivering reduced emissions through the application of Highly Premixed Cool Combustion (HPCC). NO{sub}x reduction is primarily achieved through the reduction of charge oxygen concentration, accomplished by reducing air/fuel ratio and increasing exhaust gas recirculation. This approach coupled with enhanced combustion system efficiency delivers a practical approach to meet future emissions compliance while minimizing aftertreatment requirement. The paper will examine key engine technology developments to deliver US Tier 2 Bin 5 emissions in Light Duty Diesel applications. In particular, Bin 5 emissions compliance will be possible in passenger car applications. ACTION level 2 technology will be sufficiently mature for 2007 and will require NO{sub}x aftertreatment solutions with 60-80% conversion capability. The paper describes progress to further apply the HPCC approach and lower engine-out NO{sub}x emission while controlling fuel consumption and soot. The results show the potential to minimize the requirement for NO{sub}x aftertreatment. The paper describes key areas of development being undertaken by Ricardo research projects. In particular the importance of advanced air/EGR technology and combustion control is described.