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

Patent ·
OSTI ID:1160220
; ; ;

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.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC04-94AL85000
Assignee:
Wisconsin Alumni Research Foundation (Madison, WI)
Patent Number(s):
8,851,045
Application Number:
13/077,378
OSTI ID:
1160220
Resource Relation:
Patent File Date: 2011 Mar 31
Country of Publication:
United States
Language:
English

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