Active Fuel Management

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For other similar systems, see variable displacement.

Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the

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.

Displacement on demand

General Motors was the first to modify existing production engines to enable cylinder deactivation, with the introduction of the Cadillac L62 "V8-6-4"
in 1981.

Second generation

In 2004, the electronics side was improved greatly with the introductions of Electronic Throttle Control, electronically controlled transmissions, and transient engine and transmission controls. In addition, computing power was vastly increased. A

SAE 10W40 instead of SAE 5W30, or the failure to change the engine oil or oil filter at factory recommended intervals, can also significantly impair system performance.[citation needed
]

In 2001, GM showcased the 2002

Frankfurt Auto Show, which uses the global XV8 engine with displacement on demand. In 2003, GM unveiled the Cadillac Sixteen
concept car at the Detroit Opera House, which featured an XV16 concept engine that can switch between 4, 8, and 16 cylinders.

On April 8, 2003, General Motors announced this technology (now called Active Fuel Management) to be commercially available on 2005

Vortec 5300 V8 engine. GM also extended the technology on the new High Value LZ8 V6 engine in the Chevrolet Impala and Monte Carlo
as well as the 5.3L V8 LS4 engine in the last generation Chevrolet Impala SS, Monte Carlo SS and Pontiac Grand Prix GXP. In both designs, half of the cylinders can be switched off under light loads.

On July 21, 2008, General Motors unveiled the production version of the

LS3 with Active Fuel Management which allowed it to run on four cylinders during light load conditions.[3]

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.[4][5] The system is based on Dynamic Skip Fire,[6] a technology developed by California company Tula Technology.[7] The 6.2L V8 engine of the Chevrolet Silverado incorporating the technology was named one of Ward's 10 Best Engines for 2019.[8]

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. ^ 2010 Chevrolet Camaro Details and Hi-Res Photos
  4. ^ "'19 Silverado may emerge as efficiency leader". Archived from the original on 2018-04-26. Retrieved 2018-02-21.
  5. ^ "Introducing the All-New 2019 Chevrolet Silverado". Archived from the original on 2018-04-26. Retrieved 2018-02-21.
  6. doi:10.4271/2013-01-0359
    – via www.sae.org.
  7. ^ "GM adopts advanced cylinder deactivation for 2019 Chevy Silverado V8s".
  8. ^ "2019 Winner: Chevy Silverado 6.2L OHV V-8 with DFM".

External links

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