Diesel Dynamic Skip Fire
Dynamic Skip Fire for Diesel Engines (dDSF™) enables diesel engines to be both clean and green

How Diesel Dynamic Skip Fire (dDSF™) works
Tula’s dDSF technology carefully controls the number and sequence of combustion events in a diesel engine using patented algorithms to ensure the engine operates near peak efficiency. Due to the higher cylinder load, dDSF also increases exhaust gas temperatures to continue keeping the aftertreatment system at operating temperature, especially under low-load conditions.
dDSF™ in real world situations



When high torque is needed, dDSFTM activates all cylinders.





As torque demand moderates, cylinders are dynamically skipped based on demand.





At slower speeds, maximum fuel efficiency is maintained by skipping more cylinders, even skipping all cylinders during deceleration.


Simultaneous CO2 and NOx benefits from optimal combustion
and greater conversion efficiency


Engine Controls


Temperatures


and NOx Reduction
Optimal Combustion
Reduced CO2
dDSF improves fuel efficiency by firing all events at the most efficient air to fuel ratio, allowing optimal combustion at all engine output levels.
Conversion Efficiency
Reduced NOX
Cylinder deactivation reduces excess engine airflow and increases exhaust temperatures. This allows for more efficient conversion of pollutants in the catalyst and reduced NOx - at the same aftertreatment system cost.
Test results show 74% NOx and 5% CO2 reduction
Results shown are mapped for appropriate firing densities. The improvement in turbine outlet temperature is dramatic, allowing effective aftertreament control.






Valve Train Deactivation Mechanizations for Diesel Engines


Deactivation
Finger Follower


Deactivation
Rocker Arm


Deactivation
Pushrod Cartridge


Deactivation
Valve Bridge


Deactivation
Roller Lifter
Global regulations are becoming increasingly stringent for heavy-duty diesel NOX and CO2 emissions. dDSF simultaneously reduces NOX and CO2 emissions at a low cost.


Tula has developed one of the essential technologies
for reaching fuel efficiency mandates
Click to learn more about Tula and our dedication to a cleaner Earth
Dynamic Efficiency
Starts with Tula

