The Delphi-Tula Dynamic Skip Fire (DSF) Cylinder Deactivation System is an industry-leading, fully variable engine displacement technology. It combines Delphi cylinder deactivation hardware with an engine control strategy that fires each cylinder only as necessary during each engine revolution, depending on engine torque demand. Fundamental control algorithms are provided by Tula Technology, Inc.
The Delphi-Tula DSF System significantly improves engine efficiency and reduces fuel consumption by firing fewer cylinders at lower torque loads to reduce pumping and heat losses. It also reduces noise, vibration and harshness by dynamically choosing firing sequences that avoid vehicle and driver resonance frequencies.
The powertrain and electronics giant believes combining two emerging technologies can boost the efficiency of traditional gasoline-engine vehicles by as much as 19 percent.
If so, the solution could help some automakers disentangle themselves from relying on diesel engines to meet global fuel economy regulations.
Some European automakers have banked on diesels to meet environmental standards because they offer better fuel efficiency than gasoline engines. But diesel engines are now in doubt because of tightening global CO2 standards.
Delphi officials say they can make gasoline engines hit comparable numbers while still preserving the low-end torque that diesel drivers are accustomed to.
