DUAL-FUEL DIESEL ENGINE

摘要

The objective of the present invention is to decrease the amount of liquid fuel injection to enable a reduction in fuel cost and a decrease in the environmental disruption of exhaust gas in a low load operation region of a dual-fuel diesel engine unit provided with a dual-fuel diesel engine or a plurality thereof. A cylinder head (14) is provided with a plurality of sets of dual-fuel fuel injection devices (24a, 24b) comprising a gaseous fuel injector (26) that injects gaseous fuel, which is the primary fuel, and a pilot fuel injector (28) that injects liquid fuel (o). In the low load operation region, at which there is no need to simultaneously inject and then ignite fuel from the dual-fuel fuel injection devices (24a, 24b), fuel is injected alternately from the dual-fuel fuel injection devices (24a, 24b) and then ignited for each combustion cycle. As a result, it is possible to halve the amount of liquid fuel injection in the low load operation region.