Dual fuel common rail system and fuel injector

摘要

A dual fuel system includes a plurality of fuel injectors that each have a non-injection configuration, a liquid fuel injection configuration, a gaseous fuel injection configuration and a combined fuel injection configuration. Each of the fuel injectors includes a liquid control valve member with a guide segment that defines a portion of a leak path from a liquid fuel inlet to a drain outlet, and a gas control valve member with a guide segment that defines a second leak path from the liquid fuel inlet to the drain outlet. Each injector body includes a tip component that defines both a liquid nozzle outlet set and a gas nozzle outlet set. A dual solenoid actuator has a first armature coupled to the liquid control valve member, a second armature coupled to the gas control valve member, and a shared stator.

主权项

1. A dual fuel injector comprising:
an injector body defining a first nozzle outlet set, a first fuel inlet, a second nozzle outlet set, a second fuel inlet, and a drain outlet and having disposed therein a first nozzle chamber fluidly connected to the first fuel inlet, a second nozzle chamber fluidly connected to the second fuel inlet, a first control chamber fluidly connected to the first fuel inlet, and a second control chamber fluidly connected to the first fuel inlet; a first control valve member guided in the injector body to move between a first position in contact with a first valve seat to close a first fluid connection between the first control chamber and the drain outlet, and a second position out of contact with the first valve seat to open the first fluid connection, and including a first guide segment separating a first high pressure area from a first low pressure area; a second control valve member guided in the injector body to move between a first position in contact with a second valve seat to close a second fluid connection between the second control chamber and the drain outlet, and a second position out of contact with the second valve seat to open the second fluid connection, and including a second guide segment separating a second high pressure area from a second low pressure area; a first solenoid actuator with a first armature operably coupled to the first control valve member; a second solenoid actuator with a second armature operably coupled to the second control valve member; and the first control valve member, the second control valve member, the first armature and the second armature move along a common centerline.