DUAL-FUEL DIESEL ENGINE

摘要

An object is to, in a low-load operating range of a dual-fuel diesel engine or a dual-fuel diesel engine unit including a plurality of the dual-fuel diesel engines, reduce the amount of injection of oil fuel so as to make it possible to make exhaust gas less harmful and to reduce fuel cost. On a cylinder head, a plurality of dual-fuel injectors are disposed, each of which having a gas fuel injector that injects a gas fuel being a main fuel and a pilot fuel injector that injects an oil fuel. In a low-load operating range where it is not necessary for the dual-fuel injectors to inject fuel at the same time for ignition, fuel is injected alternately from the dual-fuel injectors and combusted in every single combustion cycle. As a result, it is possible to halve the amount of injection of oil fuel in the low-load operating range.

主权项

1. A dual-fuel diesel engine comprising:
a plurality of dual-fuel injectors disposed on a cylinder head, each of the dual-fuel injectors including a pilot fuel injector configured to inject an oil fuel as a pilot fuel into a combustion chamber and a gas fuel injector configured to inject a gas fuel as a main fuel into the combustion chamber; and an engine control unit capable of performing a first fuel-injection cycle repeatedly, the first fuel-injection cycle being such that only a part of the dual-fuel injectors among the plurality of the dual-fuel injectors inject fuel in a single combustion cycle, and each of the plurality of the dual-fuel injectors injects the fuel at least once in a series of combustion cycles.