BIVALENT INTERNAL COMBUSTION ENGINE AND METHOD OF OPERATING A BIVALENT INTERNAL COMBUSTION ENGINE

摘要

The invention relates to a bivalent internal combustion engine and to a method of operating a bivalent internal combustion engine having an exhaust system which has at least one catalytic converter, wherein the internal combustion engine is operated with a liquid fuel during starting and is changed over to operation with a gaseous fuel after a starting phase and the changeover from the liquid to the gaseous fuel is effected at a switch-over instant t₁ which is set as a function of at least one ageing parameter of the catalytic converter. During a change in the at least one ageing parameter of the catalytic converter, the switch-over instant t₁ is correspondingly adapted and/or changed.