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 choose 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:

2013-12-31

Research Org.:

Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1113531

Patent Number(s):

8616177

Application Number:

12/703,808

Assignee:

Wisconsin Alumni Research Foundation (Madison, WI)

Patent Classifications (CPCs):

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

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

Show more

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

F02B1/12 - with compression ignition
F02B17/005 - {having direct injection in the combustion chamber}
F02B2275/14 - Direct injection into combustion chamber
F02B23/06 - the combustion space being arranged in working piston
F02B23/0669 - {having multiple fuel spray jets per injector nozzle}
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

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

F02D19/061 - {by controlling fuel injectors}
F02D19/0649 - {Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers}
F02D19/0689 - {for in-cylinder direct injection}
F02D19/0692 - {Arrangement of multiple injectors per combustion chamber}
F02D19/081 - {Adjusting the fuel composition or mixing ratio
F02D41/0025 - {Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures}
F02D41/3047 - {said means being a secondary injection of fuel}
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

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

Show less

DOE Contract Number:  

FC26-06NT42628; AC04-94AL85000

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING