Commercial trucking diesel engine manufacturers know how critical it is to secure both greater fuel efficiency and reduced NOX emissions

The standard diesel engine offers clear fuel consumption advantages vs. the gasoline engine, though it suffers from significant emissions challenges, especially NOX.

Meeting global regulations will require implementing advanced solutions — dDSF is the only technology that simultaneously improves fuel efficiency while reducing both CO2 and NOX emissions.

No other diesel solution offers both greater fuel savings and decreased NOX tailpipe emissions – at the best value in the industry


What is dDSF?

Like DSF for gasoline engines, dDSF uses individual cylinder deactivation control strategies to meet torque demand at optimal fuel and aftertreatment efficiency

Key solution components include:

  • DSF Valvetrain: Individual cylinder deactivation capability
  • Engine controller with dDSF: Tula’s proprietary controls strategies for smooth, efficient operation and fuel economy gains
  • dDSF offers the opportunity to decreased after-treatment costs
  • Additional synergies can be gained by coupling dDSF with hybridization

How does dDSF work?

dDSF Torque

Combustion Efficiency

dDSF improves fuel efficiency by firing all events at the most efficient ratio of air to fuel, allowing optimal combustion at all engine output levels.

Catalyst Efficiency

Cylinder deactivation reduces excess engine airflow, increasing exhaust temperatures. This allows for more efficient conversion of pollutants in the catalyst and reduced NOX, at no additional after treatment hardware cost.

Low-Load Efficiency

Traditional diesel engines emit up to 7x more NOX than average during low speed operation, according to ICCT. dDSF is particularly valuable at these low engine loads, decreasing NOX emissions in densely populated urban settings.

Tula’s dDSF is a unique solution in the diesel industry, providing both fuel/CO2 savings and NOX improvements at an industry leading value to cost ratio

The advantages of dDSF over static cylinder deactivation (CDA) are more than just CO2 and NOX reduction. dDSF also enables smoother transitions for reduced noise and vibration, and also distributes the firing of cylinders uniformly to reduce uneven engine wear.

No other diesel solution in the industry offers these benefits at a better value

The Advantages of dDSF vs. Diesel

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or other Tula fuel efficiency solutions?

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