Active Fuel Management

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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]

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[edit]

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[edit]


  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
  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
  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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