Active Fuel Management

Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors. It allows a V6 or V8 engine to "turn off" half of the cylinders under light-load conditions to improve fuel economy. Estimated performance on EPA tests shows a 5.5–7.5% improvement in fuel economy. [1]

For other similar systems, see variable displacement.

GM's Active Fuel Management [2] technology used a solenoid to deactivate the lifters on selected cylinders of a pushrod V-layout engine.

GM used the Active Fuel Management technology on a range of engines including with the GM Small Block Gen IV engine family; First-generation GM EcoTec3 engine family; Second-generation GM High-Feature V6 DOHC engine family; and First-generation High-Feature V8 DOHC engine family. Vehicle applications included the 2005 Chevy TrailBlazer EXT, the GMC Envoy XL, Envoy XUV and Pontiac Grand Prix.


Third generation

In January 2018, GM announced an improved version of AFM called Dynamic Fuel Management to be initially released in Chevy Silverado trucks. This system shuts off any number of cylinders in a variety of combinations, maximizing fuel economy and avoiding switching between banks of cylinders[3] .[4] The system is based on Dynamic Skip Fire,[5] a technology developed by California company Tula Technology.[6] The 6.2L V8 engine of the Chevrolet Silverado incorporating the technology was named one of Ward's 10 Best Engines for 2019.[7]


See also

References
  1. Stabinsky, Mark; Albertson, William; Tuttle, Jim; Kehr, David; Westbrook, James; Karbstein, Henning; Kuhl, Mario (April 16, 2007). "Active Fuel Management™ Technology: Hardware Development on a 2007 GM 3.9L V-6 OHV SI Engine" – via www.sae.org.
  2. "General Motors Active Fuel Management Cylinder Deactivation Technology". GM Authority.
  3. "'19 Silverado may emerge as efficiency leader". Archived from the original on 2018-04-26. Retrieved 2018-02-21.
  4. "Introducing the All-New 2019 Chevrolet Silverado". Archived from the original on 2018-04-26. Retrieved 2018-02-21.
  5. Wilcutts, Mark; Switkes, Joshua; Shost, Mark; Tripathi, Adya (April 8, 2013). "Design and Benefits of Dynamic Skip Fire Strategies for Cylinder Deactivated Engines". SAE International Journal of Engines. 6 (1): 278–288. doi:10.4271/2013-01-0359 – via www.sae.org.
  6. "GM adopts advanced cylinder deactivation for 2019 Chevy Silverado V8s".
  7. "2019 Winner: Chevy Silverado 6.2L OHV V-8 with DFM".
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