I guess it depends on what aspects of the engine you want to simulate and for what purpose. For performance prediction some colleagues have had reasonably good results (correlating with real engine data for full load torque) with the Lotus Engineering freeware found at www.lesoft.co.uk. The...
Software based systems for flex-fuel vehicles (vehicles able to operate on alcohol / gasoline blends with greater than 10% alcohol) do indeed use O2 sensor feedback. Several systems are available using binary sensors as well as wideband O2 sensors. Binary systems evaluate the required fuelling...