The present disclosure relates to a method of evaluating operability of a gaseous fuel admission valve (58) of an internal combustion engine (100). The method may comprise measuring (406) a sequence of temporal developments of an electrical operation param...

It is an object of the invention to achieve a stable idling revolution speed in a short time and to prevent easily the occurrence of abnormal combustion, misfire, or the like by effectively controlling a gas flow rate adjustment valve even in a case where ...