Abstract
Air assist direct injection offers the potential for significant reduction in fuel consumption and engine out emissions. This paper presents the approach taken to achieving the fuel economy goal whilst meeting the various emissions standards posted globally. The result presented demonstrate that the one air assisted direct injection system can fulfil customer requirements for both US (ULEVII) and European (EURO-IV) strategies. In addition data for the European standard will show that for the same basic changes it is possible to trade between vehicle fuel economy and aftertreatment system cost. The data will demonstrate the ability to achieve EIRO-IV with significant fuel economy benefits whilst using high sulphur fuel similar to that in the market today.