Cummins takes Euro VI to the next level

Cummins has developed diesel engines certified to Phase-D regulation, a more stringent regulation than Euro VI emission standards.

The announcement follows a two-year development and test programme. The B4.5, B6.7 and L9 engines with a 150hp to 400hp (112-298kW) range for bus and coach applications will move to full production status at the Cummins Darlington facility in the UK before Phase-D takes effect on 1 September 2019.

The Euro VI Phase-D engines achieve nearer-to-zero emissions, representing an incremental step towards Euro VII regulations, anticipated to take effect after 2025. The Phase-D regulations are thought to be particularly relevant for bus operations, as they focus on tighter control limits for Oxides of Nitrogen (NOx) emissions during lower speed city operations, as well as under cold engine start conditions. In addition to emissions test cell verification, the Phase-D regulations require on-road testing to capture real-world measurement. Duty cycle-based testing using high precision Portable Emissions Measurement systems (PEMs) installed on Cummins-powered buses has indicated a 25% reduction in NOx emissions, compared to the Phase-A engines when Euro VI was first introduced in 2015.