Fuel apportionment strategy for in-cylinder dosing

US10794251B2 · kind B2 · utility

Assignee

• Caterpillar Inc. · US

Inventors

• James Ulstad · Albion, US
• Kranti K. Nellutla · Normal, US
• Greg L. Armstrong · Albion, US
• Steven Y. Tian · Bloomington, US
• Brian P. Brennan · Steger, US
• Sasidhar Rayasam · Peoria, US
• Anand KrishnamurthyGopalan · Albion, US

Key dates

• Filing date: Sep 22, 2016
• Grant date: Oct 6, 2020
• Expiry date: Feb 10, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

An engine has an injector communicating with a combustion chamber to introduce a plurality of dosing shots to mix with exhaust gases and regenerate an aftertreatment device downstream of the combustion chamber. An apportionment strategy can apportion a per cylinder quantity, representing the quantity of dosing fuel to introduce per cylinder per combustion cycle, among a predefined number of dosing shots each having a first per shot quantity. The strategy compares the predefined number of dosing shots with a temporal dosing window to determine if predefined number of dosing shots can be conducted within the temporal dosing window. If so, the strategy proceeds to introduce the predefined number of dosing shots and if not, the strategy may recalculate a reduced number of dosing shots and reapportions a second per shot quantity.