Title: Engine combustion control via fuel reactivity stratification

Abstract

A compression ignition engine uses two or more fuel charges having two or more reactivities to control the timing and duration of combustion. In a preferred implementation, a lower-reactivity fuel charge is injected or otherwise introduced into the combustion chamber, preferably sufficiently early that it becomes at least substantially homogeneously dispersed within the chamber before a subsequent injection is made. One or more subsequent injections of higher-reactivity fuel charges are then made, and these preferably distribute the higher-reactivity matter within the lower-reactivity chamber space such that combustion begins in the higher-reactivity regions, and with the lower-reactivity regions following thereafter. 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).

Inventors:

Reitz, Rolf Deneys; Hanson, Reed M.; Splitter, Derek A.; Kokjohn, Sage L.

Issue Date:

2015-07-14

Research Org.:

Wisconsin Alumni Research Foundation, Madison, WI (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1193374

Patent Number(s):

9080501

Application Number:

14/108,868

Assignee:

Wisconsin Alumni Research Foundation (Madison, WI)

Patent Classifications (CPCs):

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

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F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

F02D41/402 - {Multiple injections}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

Y02T10/30 - Use of alternative fuels
Y02T10/12 - Technologies for the improvement of indicated efficiency of a conventional ICE

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

F02D41/0025 - {Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02B - INTERNAL-COMBUSTION PISTON ENGINES

F02B23/0669 - {having multiple fuel spray jets per injector nozzle}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

F02D19/0692 - {Arrangement of multiple injectors per combustion chamber}
F02D19/0649 - {Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers}
F02D19/061 - {by controlling fuel injectors}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02B - INTERNAL-COMBUSTION PISTON ENGINES

F02B23/0672 - {Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
F02B2275/14 - Direct injection into combustion chamber

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

F02D19/081 - {Adjusting the fuel composition or mixing ratio
F02D19/0689 - {for in-cylinder direct injection}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02B - INTERNAL-COMBUSTION PISTON ENGINES

F02B23/06 - the combustion space being arranged in working piston
F02B1/12 - with compression ignition
F02B17/005 - {having direct injection in the combustion chamber}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

F02D41/3047 - {said means being a secondary injection of fuel}

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DOE Contract Number:  

FC26-06NT42628

Resource Type:

Patent

Resource Relation:

Patent File Date: 2013 Dec 17

Country of Publication:

United States

Language:

English

Subject:

33 ADVANCED PROPULSION SYSTEMS; 42 ENGINEERING; 54 ENVIRONMENTAL SCIENCES