Unassisted Cold Starts to −29°C and Steady-State Tests of a Direct-Injection Stratified-Charge (DISC) Engine Operated on Heat Alcohols

1987 ◽  
Author(s):  
Robert M. Siewert ◽  
Edward G. Groff
Keyword(s):  
Steady State ◽  
Direct Injection ◽  
Stratified Charge ◽  
State Tests ◽  
Cold Starts

scholarly journals System Approach from Biomass Combustion in Packed Bed Reactor

2007 ◽  
Vol 7 (1 & 2) ◽  
pp. 16 ◽  
Author(s):  
Anhkien Le ◽  
Le Xuan Hai ◽  
V. N. Sharifi ◽  
J. Swithenbank
Keyword(s):  
Steady State ◽  
Transition Period ◽  
Computing Time ◽  
Substrate Inhibition ◽  
Simple Algorithm ◽  
Packed Bed ◽  
Packed Bed Reactor ◽  
Biomass Combustion ◽  
Stable Steady State ◽  
State Tests

A simple algorithm originally proposed by Choong, Paterson and Scott (2002) was tested on a model of an isothermal controlled-cycled stirred tank reactor with substrate inhibition kinetics, (r = 1 ~c). In previous work, this reacting system had been shown to exhibit steady-state multiplicity. The transition period of this system to the stable steady state is sometimes characterized by very slow change followed by a very rapid convergence to the stable steady state. Tests of the Choong-Paterson-Scott algorithm showed that the feature, which prevents premature termination of the calculations prior to reaching the true steady state, is very useful for this system. However, tests of the stopping criterion showed that the other feature of reducing the computing time was not realized in this system.

Feasibility Assessment and Operating Policy Optimization of Automotive Powertrains With Uncertainties Using Game Theory

2001 ◽  
Author(s):  
Ilya Kolmanovsky ◽  
Irina Siverguina
Keyword(s):  
Direct Injection ◽  
Operating Conditions ◽  
Lean Nox Trap ◽  
Drive Cycle ◽  
Stratified Charge ◽  
Feasibility Assessment ◽  
Feasibility Evaluation ◽  
Lean Nox ◽  
Game Theoretic ◽  
Policy Optimization

Abstract The paper describes a game-theoretic framework and a computational algorithm for feasibility evaluation of automotive powertrains with storage elements in terms of fuel economy and emissions performance. The game-theoretic framework allows to handle various time-dependent uncertainties, including uncertainties in the drive cycle. In particular, an important issue in the prior approaches to this problem, the drive cycle dependence of the optimal policies, is alleviated. Within the basic framework, it is also possible to generate implementable operating policies that specify powertrain actuator settings as functions of engine operating conditions and states of the storage elements. We illustrate the procedure using an example powertrain with a Direct Injection Stratified Charge engine and an aftertreatment system consisting of a Three Way Catalyst and a Lean NOx Trap.

Hybrid Model Predictive Control of Direct Injection Stratified Charge Engines

2006 ◽  
Vol 11 (5) ◽  
pp. 499-506 ◽  
Author(s):  
N. Giorgetti ◽  
G. Ripaccioli ◽  
A. Bemporad ◽  
I.V. Kolmanovsky ◽  
D. Hrovat
Keyword(s):  
Model Predictive Control ◽  
Hybrid Model ◽  
Predictive Control ◽  
Direct Injection ◽  
Stratified Charge
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