A New Feedback Control of a Lean Nox Trap Catalyst

Nakagawa, Shinji; Hori, Tohru; Nagano, Masami

doi:10.4271/2004-01-0527

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…For that the engine operation must be switched from lean to rich conditions, which imposes fuel penalty [49]. Periodic desulphation processes may also be needed.…”

Section: After-treatmentmentioning

confidence: 99%

A Challenging Future for the IC Engine: New Technologies and the Control Role

Payri

Lujan

Guardiola

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-New regulations on pollutants and, specially, on CO 2 emissions could restrict the use of the internal combustion engine in automotive applications. This paper presents a review of different technologies under development for meeting such regulations, ranging from new combustion concepts to advanced boosting methods and after-treatment systems. Many of them need an accurate control of the operating conditions and, in many cases, they impose demanding requirements at a system integration level. In this framework, engine control disciplines will be key for the implementation and development of the next generation engines, taking profit of recent advancements in models, methods and sensors. According to authors' opinion, the internal combustion engine will still be the dominant technology in automotive applications for the next decades.Re´sume´-Un challenge pour le futur du moteur a`combustion interne : nouvelles technologies et roˆle du controˆle moteur -Les nouvelles normes sur les e´missions, en particulier le CO 2 , pourraient re´duire l'utilisation du moteur a`combustion interne pour les ve´hicules. Cet article pre´sente une revue de diffe´rentes technologies en cours de de´veloppement afin de respecter ces normes, depuis de nouveaux concepts de combustion jusqu'a`des syste`mes avance´s de suralimentation ou de post-traitement. La plupart de ces technologies demande un controˆle pre´cis des conditions de fonctionnement et impose souvent de fortes contraintes lors de l'inte´gration des syste`mes. Dans ce contexte et en profitant des dernie`res avance´es dans les mode`les, les me´thodes et les capteurs, le controˆle moteur jouera un roˆle clef dans la mise en oeuvre et le de´veloppement de la prochaine ge´ne´ration de moteurs. De l'avis des auteurs, le moteur ac ombustion interne restera la technologie dominante pour les ve´hicules des prochaines de´cennies.

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“…For that the engine operation must be switched from lean to rich conditions, which imposes fuel penalty [49]. Periodic desulphation processes may also be needed.…”

Section: After-treatmentmentioning

confidence: 99%

A Challenging Future for the IC Engine: New Technologies and the Control Role

Payri

Lujan

Guardiola

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

show abstract

“…: LNT up-stream exhaust gas air to fuel ratio during regeneration : engine-out (without regeneration) exhaust gas air to fuel ratio Different LNT regeneration control strategies aiming at fuel penalty and emission reductions have been proposed by researchers in industry and academia, e.g. [13][20] [26][30] [31] [33] [34]. For instance, in [26], a model-based approach to control the rich pulse timing and its duration for LNT regenerations was proposed.…”

Section: Introductionmentioning

confidence: 99%

“…[13][20] [26][30] [31] [33] [34]. For instance, in [26], a model-based approach to control the rich pulse timing and its duration for LNT regenerations was proposed. A LNT model adaptation mechanism was used to adjust the rich pulse timings and durations to reduce the tailpipe emissions.…”

Section: Introductionmentioning

confidence: 99%

Two-Level Nonlinear Model Predictive Control for Lean NOx Trap Regenerations

Hsieh

Wang

Canova

2010

Journal of Dynamic Systems, Measurement, and Control

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This paper describes a two-level nonlinear model predictive control (NMPC) scheme for diesel engine lean NOx trap (LNT) regeneration control. Based on the physical insights into the LNT operational characteristics, a two-level NMPC architecture with the higher-level for the regeneration timing control and the lower-level for the regeneration air to fuel ratio profile control is proposed. A physically based and experimentally validated nonlinear LNT dynamic model is employed to construct the NMPC control algorithms. The control objective is to minimize the fuel penalty induced by LNT regenerations while keeping the tailpipe NOx emissions below the regulations. Based on the physical insights into the LNT system dynamics, different choices of cost function were examined in terms of the impacts on fuel penalty and tailpipe NOx slip amount. The designed control system was evaluated on an experimentally validated vehicle simulator, cX-Emissions, with a 1.9 l diesel engine model through the FTP75 driving cycle. Compared with a conventional LNT control strategy, 31.9% of regeneration fuel penalty reduction was observed during a single regeneration. For the entire cold-start FTP75 test cycle, a 28.1% of tailpipe NOx reduction and 40.9% of fuel penalty reduction were achieved.

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“…Different LNT regeneration control strategies aiming at fuel penalty and emission reductions have been studied by researchers in both industry and academia [2][3][4][5][6][7]. For instance, in [2], the author developed an in-cylinder nopost-injection rich-lean combustion switching control for LNT regeneration purpose for fuel penalty reduction.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, in [2], the author developed an in-cylinder nopost-injection rich-lean combustion switching control for LNT regeneration purpose for fuel penalty reduction. Nakagawa et al proposed a model-based approach to control the rich pulse timing and its duration for LNT regenerations [3]. A LNT model adaptation mechanism was used to adjust the rich pulse timing and duration to reduce the tailpipe emissions.…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Control Approach for AFR Control during Lean NOx Trap Regenerations

Hsieh

Canova

Wang

2009

SAE Int. J. Fuels Lubr.

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This paper describes a diesel engine lean trap (LNT) regeneration air to fuel ratio (AFR) control system using nonlinear model predictive control (NMPC) technique for simultaneous regeneration fuel penalty and overall tailpipe-out reductions. A physics-based and experimentally validated nonlinear LNT dynamic model was employed to construct the MMPC control algorithm, which dictates the AFR value during regenerations. Different choices of NMPC cost function were examined in terms of the impact on fuel penalty and total tailpipe slip amount. The cost function to achieve the best tradeoff between fuel penalty and tailpipe-out was selected based on physical insights into the LNT system and oxygen storage dynamics. The NMPC regeneration AFR control system was evaluated on a vehicle simulator cX-Emissions 1 with a 1.9L diesel engine model through the FTP75 driving cycle. Compared with the conventional LNT regeneration AFR control strategies such as a PID controller, 23.7% of regeneration fuel penalty reduction and 16% of tailpipe mass reduction were observed.

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A New Feedback Control of a Lean Nox Trap Catalyst

Cited by 11 publications

References 10 publications

A Challenging Future for the IC Engine: New Technologies and the Control Role

A Challenging Future for the IC Engine: New Technologies and the Control Role

Two-Level Nonlinear Model Predictive Control for Lean NOx Trap Regenerations

Model Predictive Control Approach for AFR Control during Lean NOx Trap Regenerations

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