Limp home capable dual fuel engine and machine using same

摘要

A dual fuel engine powers a machine by burning natural gas and liquid diesel fuel. When operating in a low load mode, some of the engine cylinders are fueled with a high ratio of diesel/gas, and the remaining cylinders are unfueled. When operating in a high load mode, all of the engine cylinders are fueled with a low ratio of diesel/gas. When operating in a limp home mode, the fuel injectors are configured to inject only diesel fuel into all of the plurality of engine cylinders.

主权项

1. A machine comprising:
a machine body supported by a conveyance; a dual fuel compression ignition engine having a plurality of cylinders, being attached to the machine body and operably coupled to the conveyance; a dual fuel system operably coupled to supply the dual fuel compression ignition engine with liquid diesel fuel and natural gas fuel from a single fuel injector directly into respective engine cylinders; an electronic controller in control communication with the dual fuel system and having a low load algorithm, a high load algorithm and a limp home algorithm each configured to control operation of the dual fuel system; wherein the low load algorithm is configured to inject a high ratio diesel fuel to natural gas fuel into less than all of the plurality of engine cylinders in each engine cycle, and inject no diesel fuel or natural gas fuel into the remaining engine cylinders; wherein the high load algorithm is configured to inject a low ratio of diesel fuel to natural gas fuel into all of the plurality of engine cylinders; and wherein the limp home algorithm is configured to inject only diesel fuel into all of the plurality of engine cylinders.