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Title: Predictive modeling and reducing cyclic variability in autoignition engines

Abstract

Methods and systems are provided for controlling a vehicle engine to reduce cycle-to-cycle combustion variation. A predictive model is applied to predict cycle-to-cycle combustion behavior of an engine based on observed engine performance variables. Conditions are identified, based on the predicted cycle-to-cycle combustion behavior, that indicate high cycle-to-cycle combustion variation. Corrective measures are then applied to prevent the predicted high cycle-to-cycle combustion variation.

Inventors:
; ; ;
Publication Date:
Research Org.:
The Regents of the University of Wisconsin, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1312576
Patent Number(s):
9,429,096
Application Number:
13/621,539
Assignee:
The Regents of the University of Wisconsin DOEEE
DOE Contract Number:
EE0003533
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 Sep 17
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 33 ADVANCED PROPULSION SYSTEMS

Citation Formats

Hellstrom, Erik, Stefanopoulou, Anna, Jiang, Li, and Larimore, Jacob. Predictive modeling and reducing cyclic variability in autoignition engines. United States: N. p., 2016. Web.
Hellstrom, Erik, Stefanopoulou, Anna, Jiang, Li, & Larimore, Jacob. Predictive modeling and reducing cyclic variability in autoignition engines. United States.
Hellstrom, Erik, Stefanopoulou, Anna, Jiang, Li, and Larimore, Jacob. 2016. "Predictive modeling and reducing cyclic variability in autoignition engines". United States. doi:. https://www.osti.gov/servlets/purl/1312576.
@article{osti_1312576,
title = {Predictive modeling and reducing cyclic variability in autoignition engines},
author = {Hellstrom, Erik and Stefanopoulou, Anna and Jiang, Li and Larimore, Jacob},
abstractNote = {Methods and systems are provided for controlling a vehicle engine to reduce cycle-to-cycle combustion variation. A predictive model is applied to predict cycle-to-cycle combustion behavior of an engine based on observed engine performance variables. Conditions are identified, based on the predicted cycle-to-cycle combustion behavior, that indicate high cycle-to-cycle combustion variation. Corrective measures are then applied to prevent the predicted high cycle-to-cycle combustion variation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 8
}

Patent:

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  • Methods and systems for controlling combustion performance of an engine are provided. A desired fuel quantity for a first combustion cycle is determined. One or more engine actuator settings are identified that would be required during a subsequent combustion cycle to cause the engine to approach a target combustion phasing. If the identified actuator settings are within a defined acceptable operating range, the desired fuel quantity is injected during the first combustion cycle. If not, an attenuated fuel quantity is determined and the attenuated fuel quantity is injected during the first combustion cycle.
  • This patent describes a method of operating a catalytic ignition engine having a combustion chamber provided with at least one auxiliary chamber communicating with the combustion chamber, which comprises: (a) heating an ignition catalyst comprising at least a portion of the walls of the combustion chamber to a temperature high enough to be effective for vaporization of fuel drops and ignition of vaporized fuel; the catalyst being thermally insulated to minimize heat losses through the wall portion; the catalyst being subsequently maintained at operating temperature by combustion heat; (b) compressing air in the combustion chamber; (c) injecting fuel into themore » compressed air and into the auxiliary chamber; (d) impinging at least a portion of the fuel with the heated catalyst at a time near maximum compression; (e) and initiation of a timed area-wide multiple point chain reaction being ignited by the heated catalyst resulting in instantaneous and substantially complete combustion which is closer to Otto cycle than to Diesel cycle performance in that a sharp combustion pressure wave occurs in the immediate vicinity of top dead center.« less
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  • A cyclic char fuel burning power reactor (CFR) is described, comprising: at least one combined means for compressing and expanding gases, each comprising: an internal combustion engine (ICE) mechanism comprising a variable volume chamber (VVC) for compressing and expanding gases, and drive means for driving the ICE mechanism and for varying the volume of the chamber through repeated cycles and each the combined means being connected to a separate primary reaction chamber (PRC), within a pressure vessel container, each the PRC comprising: a refuel end with a mechanism for supplying fresh char fuel (CF) particles into the refuel end, anmore » ash collection end, a CF direction of motion from the refuel end toward the ash removal end, a CF preheat zone positioned toward the refuel end, a rapid reaction zone positioned between the CF preheat zone and the ash collection zone, and at least one means for removing ashes; the CFR further comprising a source of supply of reactant gas containing appreciable oxygen gas to each the intake means for admitting reactant gases into the VVC; means for preheating the CF within the PRC to that temperature at which the CF reacts rapidly with oxygen in adjacent compressed reactant gases when the CFR is being started; means for cranking the ICE mechanism when the CFR is being started; an improvement comprising adding to each the PRC a reactant gas manifold comprising an inlet and an outlet; a producer gas reservoir (pgr) wherein all of the reactant gas inlet ports and also all of the outlet ports are smaller in at least one area cross section dimension than the CF particles to be refueled into the PRC; means for gas flow connecting the VVC of the ICE mechanism to the PRC so that during all compression time intervals gas flows from the VVC into the PRC via the reactant gas manifold inlet and gas flows from the PRC into the pgr; and further so that during all expansion time intervals gas flows from the pgr and the PRC into the VVC.« less