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Title: Engine combustion control at low loads via fuel reactivity stratification

Abstract

A compression ignition (diesel) engine uses two or more fuel charges during a combustion cycle, with the fuel charges having two or more reactivities (e.g., different cetane numbers), in order to control the timing and duration of combustion. By appropriately choosing the reactivities of the charges, their relative amounts, and their timing, combustion can be tailored to achieve optimal power output (and thus fuel efficiency), at controlled temperatures (and thus controlled NOx), and with controlled equivalence ratios (and thus controlled soot). At low load and no load (idling) conditions, the aforementioned results are attained by restricting airflow to the combustion chamber during the intake stroke (as by throttling the incoming air at or prior to the combustion chamber's intake port) so that the cylinder air pressure is below ambient pressure at the start of the compression stroke.

Inventors:
; ; ;
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1415024
Patent Number(s):
9,850,812
Application Number:
14/506,766
Assignee:
Wisconsin Alumni Research Foundation (Madison, WI) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Oct 06
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Reitz, Rolf Deneys, Hanson, Reed M., Splitter, Derek A., and Kokjohn, Sage. Engine combustion control at low loads via fuel reactivity stratification. United States: N. p., 2017. Web.
Reitz, Rolf Deneys, Hanson, Reed M., Splitter, Derek A., & Kokjohn, Sage. Engine combustion control at low loads via fuel reactivity stratification. United States.
Reitz, Rolf Deneys, Hanson, Reed M., Splitter, Derek A., and Kokjohn, Sage. Tue . "Engine combustion control at low loads via fuel reactivity stratification". United States. doi:. https://www.osti.gov/servlets/purl/1415024.
@article{osti_1415024,
title = {Engine combustion control at low loads via fuel reactivity stratification},
author = {Reitz, Rolf Deneys and Hanson, Reed M. and Splitter, Derek A. and Kokjohn, Sage},
abstractNote = {A compression ignition (diesel) engine uses two or more fuel charges during a combustion cycle, with the fuel charges having two or more reactivities (e.g., different cetane numbers), in order to control the timing and duration of combustion. By appropriately choosing the reactivities of the charges, their relative amounts, and their timing, combustion can be tailored to achieve optimal power output (and thus fuel efficiency), at controlled temperatures (and thus controlled NOx), and with controlled equivalence ratios (and thus controlled soot). At low load and no load (idling) conditions, the aforementioned results are attained by restricting airflow to the combustion chamber during the intake stroke (as by throttling the incoming air at or prior to the combustion chamber's intake port) so that the cylinder air pressure is below ambient pressure at the start of the compression stroke.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 26 00:00:00 EST 2017},
month = {Tue Dec 26 00:00:00 EST 2017}
}

Patent:

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