An HCCI engine has the ability to operate over a large load range by utilizing a lower cetane distillate diesel fuel to increase ignition delay. This permits more stable operation at high loads by avoidance of premature combustion before top dead center. During low load conditions, a portion of the engines cylinders are deactivated so that the remaining cylinders can operate at a pseudo higher load while the overall engine exhibits behavior typical of a relatively low load.
This invention was made with Government support under DOE Contract No. DE-FC26-05NT4 2412 awarded by the U.S. Department of Energy. The Government has certain rights to this invention.