Diesel engines giant Cummins Inc. and California-based tech company Tula Technology Inc. are testing Tula’s diesel Dynamic Skip Fire (dDSF) software to control cylinder deactivation, demonstrating significant reductions in emissions and fuel consumption.

“We will continue to innovate the diesel engine system to make it lighter, more reliable, powerful, and fuel-efficient, and we are encouraged by the progress demonstrated in this collaboration and what it could mean for future diesel technology,” says Lisa Farrell, director, Advanced System Integration, Cummins Inc.

Started in early 2019, the project sought to address future, more stringent emissions regulations. The collaboration work was carried out on a Cummins X15 Efficiency Series 6-cylinder diesel engine. The team modified the engine system to integrate DSF control algorithms to command combustion or deactivation on a cylinder-event basis. On the low-load cycle being proposed by the California Air Resources Board, dDSF technology simulations predict reductions in tailpipe NOx and CO2 emissions. NOx reductions primarily result from optimizing exhaust temperature to improve aftertreatment system efficiency. CO2 reductions come from improving combustion and reducing pumping work.

“Our partnership with Cummins has given us the opportunity to expand our DSF technology beyond its success in gasoline engines. Demonstrating the capability to improve fuel efficiency while also achieving very effective emissions control is extremely important for all diesel engine applications in the future,” says Tula President and CEO R. Scott Bailey.

The collaboration will continue with exploring future system optimization and viability to control noise, vibration, and harshness (NVH) in commercial vehicle applications.

Cummins Inc. https://www.cummins.com

Tula Technology Inc. https://www.tulatech.com