Skip-Fire Fuel Injection System and Method

摘要

A cycle-by-cycle skip-fire fuel-injection technique for pilot-ignited engines involve skip-firing selected combustion chambers when a low load condition is determined and modulating the fuel delivery to maintain the requisite engine power, while reducing pilot fuel quantity to a predetermined minimum. Overall pilot fuel consumption is thereby reduced.

主权项

1. A method of skip-firing an engine system wherein said engine system has a plurality of combustion chambers and a fuel-injection system and said engine system is configured to use a main fuel and a pilot fuel, said steps of said method comprising:
(a) detecting when said engine system is experiencing a predetermined low load condition for applying a skip-fire injection mode; (b) determining and selecting at least one combustion chamber of said plurality of combustion chambers designated for skip-firing during a next cycle; (c) skip-firing said selected at least one combustion chamber for a given duration; (d) determining whether said engine system continues experiencing said low load condition during said given duration.