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
Dose escalation enzyme replacement therapy for treating acid sphingomyelinase deficiency
Non-volatile memory array and device using erase markers
High damage threshold frequency conversion system
Per-request control of DNS behavior
Reliability fire pressure switch
Methods and devices for creating, compressing and searching binary tree
Method of interfacing a host operating through a logical address space with a direct file storage medium
  Randomly Featured Patents
Image browser
Retrievable packoff with an embedded flexible, metallic band
Set battery charging condition detecting apparatus
Method of correcting coin data and apparatus for inspecting coins
Folding device for a folding and gluing machine
Rigid and semirigid thermoplastic structures with multiple coextruded polymeric layers incorporating an inner vinylidene chloride copolymer layer and use of these structures for the manufactur
Audio guided intubation stylet
System and method for processing work products for vehicles via the world wide web
Table top