Abstract:
A fuel system (12) includes a plurality of fuel injectors (30) each defining a nozzle supply passage (48), a nozzle outlet (50) and a low pressure space (54). The fuel system (12) includes a plurality of mechanically actuated pressure intensifiers (70) each including a tappet (32) and being positioned partially within one of the fuel injectors (30), and a common rail (44) fluidly connecting with each of the fuel injectors (30). Each of the fuel injectors (30) further includes an injection pressure control mechanism (80) having an injection pressure control valve (82). Each injection pressure control valve (82) blocks the corresponding pressure intensifier (70) from the common rail (44) and fluidly connects the pressure intensifier (80) with the low pressure space (54) at a first position, and fluidly connects the pressure intensifier (80) with the common rail (44) and blocks the pressure intensifier (70) from the low pressure space (54) at a second position. Injecting fuel via operating the fuel system (12) may include operating the fuel system(12) in a low leakage mode where the pressure intensifier (70) displaces fuel at a low pressure, between high pressure injections.
Abstract:
A dual fuel system (10) includes a plurality of fuel injectors (12) 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 (12) includes a liquid control valve member (140) with a guide segment (141) that defines a portion of a leak path (148) from a liquid fuel inlet (33) to a drain outlet (77), and a gas control valve member (160) with a guide segment (141) that defines a second leak path (168) from the liquid fuel inlet (33) to the drain outlet (77). Each injector body (70) includes a tip component (71) that defines both a liquid nozzle outlet set (90) and a gas nozzle outlet set (99). A dual solenoid actuator (100) has a first armature (107) coupled to the liquid control valve member (140, a second armature (1087) coupled to the gas control valve member (160), and a shared stator (103).