Dynamic Skip Fire

DSF® technology delivers 5-15% efficiency gains in passenger vehicles

How Dynamic Skip Fire (DSF®) works

DSF skips or fires individual cylinders dynamically on an event-by-event basis to meet the requested torque from an engine. Through careful control of the number and sequence of combustion events using patented algorithms, engine operation occurs near peak efficiency, creating a software-controlled variable displacement engine. Tula’s algorithms avoid noise and vibration generation to give drivers expected levels of refinement under all driving conditions.

DSF® in real world situations

High Torque
Merging On to the Freeway

When high torque is needed, DSF® activates all cylinders

Medium Torque
Highway Cruise

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

Low Torque
Low Speed Cruise

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

How DSF is implemented

Software in Engine Control Module

DSF® can be implemented with existing technology

Cylinder Deactivation Hardware

Engine oil pressure desplaces locking pin
Cam does not activate the valve

Tula’s DSF works with most deactivation valvetrains

DSF relies on individual cylinder deactivation. Each cylinder fire or skip needs to be controlled by deactivation capable intake and exhaust valves.

Valve deactivation can be through hydraulic or electromechanical means.

DSF has an excellent value proposition as evidenced by more than a million vehicles with DSF on the road today

More than 2x higher value than competing fuel economy options
Applies to all engine types
As much as 5–15% fuel consumption benefit
Up to 1 ton reduction in annual CO2 emissions per vehicle

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

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