Patent ID: 6405704
Filing Date: 2002-06-18
Classification: F02B

Abstract:
A method of operating an internal combustion expanding chamber piston engine for providing limited temperature combustion, said engine having (1) at least one cylinder and an associated piston for forming a combustion chamber, said piston having a top dead center position, (2) an operating cycle including an intake stroke, a compression stroke and an expansion stroke, and (3) a fuel introduction system, said method comprising the steps of:forming a fuel/air mixture by introducing a fraction of the total fuel for the cycle; igniting the fuel/air mixture when the piston is substantially at top dead center; and introducing at least one additional fraction of the total fuel for the cycle during combustion in a predetermined phase relationship to the top dead center position; wherein the timing of the introduction of the fuel fractions and the quantities of the fuel fractions limit the maximum combustion temperature to achieve a lower emission value for nitrogen oxides.