A variable compression ratio internal combustion engine is programmably
configured to operate in a plurality of compression ratios. Internal
combustion engines with electronically controlled engine components that
include electronic valve operation are programmed to operate individual
engine cylinders with component states and stoke sequences that provide
variable compression ratios by creation of a virtual cylinder within a
physical cylinder. Cylinder volume dictates maximum compression ratio,
which acts as a ceiling for the variable compression ratio that can be
provided.