Indirect Adaptive Control of a Three-Way Catalyst

Shafai, Esfandiar; Roduner, Christian; Geering, Hans P.

doi:10.4271/961038

Cited by 43 publications

(18 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, mainly due to the complexity and even unfamiliarity with the dynamic processes taking place inside the catalytic converter this latter approach has not often been used. Shafai et al [4] have shown that it is possible to develop a true catalytic converter controller by controlling the oxygen level stored on ceria in an adaptive way. Though quite effective the proposed scheme has a small drawback in the simplicity of the used converter model, which might also affect the controller performance when a larger dynamic range is considered.…”

Section: Introductionmentioning

confidence: 99%

On a Model-Based Control of a Three-Way Catalytic Converter

Balenovic¹,

Backx²,

Hoebink³

2001

SAE Technical Paper Series

View full text Add to dashboard Cite

Though very important for the system performance, the dynamic behavior of the catalytic converter has mainly been neglected in the design of exhaust emission control systems. Since the major dynamic effects stem from the oxygen storage capabilities of the catalytic converter, a novel model-based control scheme, with the explicit control of the converter's oxygen storage level is proposed. The controlled variable cannot be measured, so it has to be predicted by an on-line running model (inferential sensor). The model accuracy and adaptability are therefore crucial. A simple algorithm for the model parameter identification is developed. All tests are performed on a previously developed first principle model of the catalytic converter so that the controller effectiveness and performance can clearly be observed.

show abstract

Section: Introductionmentioning

confidence: 99%

On a Model-Based Control of a Three-Way Catalytic Converter

Balenovic¹,

Backx²,

Hoebink³

2001

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…2.65 must be carried out. Since the storage capacity decreases with time, an on-line identification, as proposed in [154], is necessary. With ageing of the upstream wide-range air/fuel ratio sensor, a slowly increasing offset of its output signal is observed.…”

Section: Outer Control Loopmentioning

confidence: 99%

Introduction to Modeling and Control of Internal Combustion Engine Systems

2004

View full text Add to dashboard Cite

SoftcOVel: reprint of the hardcover 1st edition 2004 The use of general descriptive names, registered names trademarks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. Preface Who should read this text?This text is intended for students interested in the design of classical and novel IC engine control systems. Its focus lies on the control-oriented mathematical description of the physical processes involved and on the model-based control system design and optimization. This text has evolved from a lecture series held during the last several years in the mechanical engineering (ME) department at ETH Zurich. The presumed audience is graduate ME students with a thorough understanding of basic thermodynamic and fluid dynamics processes in internal combustion engines (ICE). Other prerequisites are knowledge of general ME topics (calculus, mechanics, etc.) and a first course in control systems. Students with little preparation in basic ICE modeling and design are referred to [52] Why has this text been written?Internal combustion engines represent one of the most important technological success stories in the last 100 years. These systems have become the most frequently used sources of propulsion energy in passenger cars. One of the main reasons that this has occurred is the very high energy density of liquid hydrocarbon fuels. As long as fossil fuel resources are used to fuel cars, there are no foreseeable alternatives that offer the same benefits in terms of cost, safety, pollutant emission and fuel economy (always in a total cycle, or "wellto-wheel" sense, see e.g., [5] and [55]).Internal combustion engines still have a substantial potential for improvements; Diesel (compression ignition) engines can be made much cleaner and Otto (spark ignition) engines still can be made much more fuel efficient. Each goal can be achieved only with the help of control systems. Moreover, with the systems becoming increasingly complex, systematic and efficient system VI Preface design procedures have become technological and commercial necessities. This text addresses these issues by offering an introduction to model-based control system design for ICE. What can be learned from this text?The primary emphasis is put on the ICE (torque production, pollutant formation, etc.) and its auxiliary devices (air-charge control, mixture formation, pollutant abatement systems, etc.). Mathematical models for some of these processes will be developed below. Using these models, selected feedforward and feedback control problems will then be discussed.A model-based approach is chosen because, even though more cumbersome in the beginning, it after proves to be the most cost-effective in the long run. Especially the control system development and calibration processes benefit greatly from mathematical models at early project stages.The appendix contains a brief summary of the most important control...

show abstract

“…A model-based closed-loop estimation approach shown in Refs. [29] and [30] is adapted and integrated. The structure of the estimator is shown in Fig.…”

Section: Estimationmentioning

confidence: 99%

Fuel Economy of a Multimode Combustion Engine With Three-Way Catalytic Converter

Nüesch

Stefanopoulou

Jiang

et al. 2014

Journal of Dynamic Systems, Measurement, and Control

View full text Add to dashboard Cite

Highly diluted, low temperature homogeneous charge compression ignition (HCCI) com-bustion leads to ultralow levels of engine-out NOx emissions. A standard drive cycle, however, would require switches between HCCI and spark-ignited (SI) combustion modes. In this paper we quantify the efficiency benefits of such a multimode combustion engine, when emission constraints are to be met with a three-way catalytic converter (TWC). The TWC needs unoccupied oxygen storage sites in order to achieve acceptable performance. The lean exhaust gas during HCCI operation, however, fills the oxygen storage and leads to a drop in NOx conversion efficiency. If levels of tailpipe NOx become unacceptable, a mode switch to a fuel rich combustion mode is necessary in order to deplete the oxygen storage and restore TWC efficiency. The resulting lean-rich cycling leads to a penalty in fuel economy. Another form of penalty originates from the lower combustion efficiency during a combustion mode switch itself. In order to evaluate the impact on fuel economy of those penalties, a finite state model for combustion mode switches is combined with a longitudinal vehicle model and a phenomenological TWC model, focused on oxygen storage. The aftertreatment model is calibrated using combus-tion mode switch experiments from lean HCCI to rich spark-assisted HCCI (SA-HCCI) and back. Fuel and emission maps acquired in steady-state experiments are used. Differ-ent depletion strategies are compared in terms of their influence on drive cycle fuel econ-omy and NOx emissions. It is shown that even an aggressive lean-rich cycling strategy will marginally satisfy the cumulated tailpipe NOx emission standards under warmed-up conditions. More notably, the cycling leads to substantial fuel penalties that negate most of HCCI’s efficiency benefits. [DOI: 10.1115/1.4028885]

show abstract

Indirect Adaptive Control of a Three-Way Catalyst

Cited by 43 publications

References 2 publications

On a Model-Based Control of a Three-Way Catalytic Converter

On a Model-Based Control of a Three-Way Catalytic Converter

Introduction to Modeling and Control of Internal Combustion Engine Systems

Fuel Economy of a Multimode Combustion Engine With Three-Way Catalytic Converter

Contact Info

Product

Resources

About