F02D 19/0642

Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed {characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions}