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
When high torque is needed, DSF® 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
How DSF is implemented
Software in Engine Control Module
Cylinder Deactivation Hardware
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
Tula has developed one of the “essential technologies for reaching fuel efficiency mandates”
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Dynamic Efficiency
Starts with Tula
