An Internal combustion engine system fueled by a gaseous fuel, a gaseous fueling system for an internal combustion engine and a method of fueling an internal combustion engine

摘要

A hybrid gaseous fueling system has a low pressure supply (32) and a high pressure supply (50). This system provides the advantages of fueling with a low pressure charge during steady state operation and also provides a way to more readily smooth engine transients resulting from changes in engine operating characteristics such as speed or load by modulating high pressure fueling of the engine (10). Furthermore, air/fuel ratio control may be readily integrated into this system. In addition, start-up of the engine is performed using more fuel from the high pressure supply (50) than the low pressure supply (32) up to a predetermined level of engine operation. At that level and beyond, low pressure fueling is greater than high pressure fueling.