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:

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

Issue Date:

2014-10-07

Research Org.:

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1160220

Patent Number(s):

8851045

Application Number:

13/077,378

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

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

F02B1/14 - Methods of operating
F02B17/005 - {having direct injection in the combustion chamber}
F02B69/02 - for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel

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

F02D11/105 - {characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque}
F02D13/0234 - {changing the valve timing only}
F02D19/081 - {Adjusting the fuel composition or mixing ratio
F02D2041/001 - {for engines with variable valve actuation}
F02D2041/0022 - {for diesel engines by throttle control}
F02D2041/3052 - {the mode being the stratified charge compression-ignition mode}
F02D41/0002 - {Controlling intake air}
F02D41/0025 - {Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures}
F02D41/006 - {using internal EGR
F02D41/08 - for idling
F02D41/3017 - {characterised by the mode
F02D41/3047 - {said means being a secondary injection of fuel}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02M - SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

F02M43/00 - Fuel-injection apparatus operating simultaneously on two or more fuels or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
F02M69/044 - {for injecting into the intake conduit downstream of an air throttle valve}
F02M69/046 - {for injecting into both the combustion chamber and the intake conduit}

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
Y02T10/40 - Engine management systems

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DOE Contract Number:  

AC04-94AL85000

Resource Type:

Patent

Resource Relation:

Patent File Date: 2011 Mar 31

Country of Publication:

United States

Language:

English

Subject:

33 ADVANCED PROPULSION SYSTEMS