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
Fluid conduit with PTC fabric heating
Protocol delay measuring device and protocol delay measuring method
Systems and methods for providing live voicemail to a mobile handset
Cycloalkylamine substituted isoquinoline derivatives
Method and system of channel detecting and reporting, terminal, and management center
Grounding fitting
Optical sensor and electronic apparatus
  Randomly Featured Patents
Establishing a split-terminated communication connection through a stateful firewall, with network transparency
Optical information recording medium near infrared absorbing material therefor
Hearing aid which cuts on/off during removal and attachment to the user
Network based format conversion
Vehicular component control systems and methods
Clay composition for shaping noble metal and method for production of sinter of noble metal
Tape automated bonding feeder and lead forming apparatus
Apparatus and method for arbitrating among equal priority requests
Decoding barcodes