Resources Contact Us Home
Internal combustion engine control for improved fuel efficiency

Image Number 7 for United States Patent #8131447.

A variety of methods and arrangements for improving the fuel efficiency of internal combustion engines are described. Generally, selected combustion events are skipped during operation of the internal combustion engine so that other working cycles can operate at a better thermodynamic efficiency. In one aspect of the invention, an engine is controlled to operate in a variable displacement mode. In the variable displacement mode, fuel is not delivered to the working chambers (e.g. cylinders) during selected "skipped" working cycles. During active ("non-skipped") working cycles, a maximum (e.g., unthrottled) amount of air and an optimized amount of fuel is delivered to the relevant working chambers so that the fired working chambers can operate at efficiencies closer to their optimal efficiency. A controller is used to dynamically determine the chamber firings required to provide the engine torque based on the engine's current operational state and conditions. The chamber firings may be sequenced in real time or in near real time in a manner that helps reduce undesirable vibrations of the engine.

  Recently Added Patents
Transcription factor
Managing multiple web services on a single device
Group control method for machine type communication and mobile communication system using the method
DNA promoters and anthrax vaccines
Injection molding method and injection molding machine
Method and apparatus for sensing an input object relative to a sensing region of an ultrasound sensor device
Female urine funnel
  Randomly Featured Patents
High density nonvolatile memory and decoder of the same
Multilevel interconnection and method for making
Processes for the production of mono- and multifilaments and staple fibers based on kolyarylene sulfides and high-strength polyarylene sulfide fibers
Process for producing N-acyl-acyloxy aromatic amines
Thermoplastic blow moldable polybutylene terephthalate compositions
Cis-prenyltransferases from plants
Generation of halftone overlays for combination with halftoned images
Lingual orthodontic bracket with hinged closure
Elastic wave device and method of producing the same
Foldable automotive seat