Abstract: The invention relates to a device and a method for ascertaining an injection time and/or an amount of a liquefied gas fuel—such as liquefied petroleum gas (LPG), natural gas (CNG), liquefied natural gas (LNG), biogas or hydrogen (H2)—to be delivered to a cylinder of an engine (19) in order to operate the engine (19) in a bivalent or trivalent fuel operating mode, said device being designed in such a way that the ascertained injection time of the liquefied gas fuel is dependent on an ascertained calorific power or an ascertained gas mixture characteristic. A gas mixture analysis module (7) is used for optimizing combustion. A gas start mechanism allows a vehicle to be started on gas power even at low temperatures.

Abstract: The invention relates to a device and a method for ascertaining an injection time and/or an amount of a liquefied gas fuel—such as liquefied petroleum gas (LPG), natural gas (CNG), liquefied natural gas (LNG), biogas or hydrogen (H2)—to be delivered to a cylinder of an engine (19) in order to operate the engine (19) in a bivalent or trivalent fuel operating mode, said device being designed in such a way that the ascertained injection time of the liquefied gas fuel is dependent on an ascertained calorific power or an ascertained gas mixture characteristic. A gas mixture analysis module (7) is used for optimizing combustion. A gas start mechanism allows a vehicle to be started on gas power even at low temperatures.