主权项 |
1. A method of controlling injection rate shape of a gaseous fuel in a dual fuel injector of an engine, the dual fuel injector comprises a gaseous fuel needle check, a gaseous fuel control chamber, and a spring chamber, wherein interaction between liquid fuel pressure in the gaseous fuel control chamber and the liquid fuel pressure of the spring chamber controls lifting of the gaseous fuel needle check, the method comprising the steps of:
determining an injection rate shape based on current operational characteristics of the engine; determining the liquid fuel pressure at which liquid fuel is to be supplied to the gaseous fuel control chamber and the spring chamber, wherein the liquid fuel pressure is based on the determined injection rate shape; delivering the liquid fuel to the gaseous fuel control chamber and the spring chamber, at the determined liquid fuel pressure to achieve the determined injection rate shape; and lifting the gaseous fuel needle check to inject the gaseous fuel based on the determined injection rate shape. |