Apparatus And Method For Igniting A Gaseous Fuel In A Direct Injection Internal Combustion Engine

摘要

An apparatus and method for igniting a gaseous fuel directly introduced into a combustion chamber of an internal combustion engine comprises steps of heating a space near a fuel injector nozzle; introducing a pilot amount of the gaseous fuel in the combustion chamber during a first stage injection event; controlling residency of the pilot amount in the space such that a temperature of the pilot amount increases to an auto-ignition temperature of the gaseous fuel whereby ignition occurs; introducing a main amount of the gaseous fuel during a second stage injection event after the first stage injection event; and using heat from combustion of the pilot amount to ignite the main amount.

主权项

1. A method of igniting gaseous fuel directly introduced into a combustion chamber of an internal combustion engine comprising steps of:
introducing a pilot amount of gaseous fuel into said combustion chamber; igniting said pilot amount of gaseous fuel; introducing a main amount of gaseous fuel into said combustion chamber; using heat from combustion of said pilot amount of gaseous fuel to ignite said main amount of gaseous fuel; and controlling gaseous fuel flow into said combustion chamber between said main amount of gaseous fuel and said pilot amount of gaseous fuel by providing a ratio between a main cross-sectional area of a main injection passageway in a fuel injector nozzle and a pilot cross-sectional area of a pilot injection passageway in said fuel injector nozzle within a range of 4 to 49.