In-cylinder Burned Gas Rate Estimation and Control on VVA Diesel Engines

Leroy, Thomas; Bitauld, M.; Chauvin, Jonathan; Petit, Nicolas

doi:10.4271/2009-01-0366

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…The engine operating conditions tested in this study focus on the moderate loads and speeds as listed in Table 2. This study concentrates on the evaluation of various intake valve lift profiles on performance and emissions of a diesel PCCI engine at part load, and the variable exhaust valve strategies, such as reopening the exhaust valve during the intake stroke for transient operation and early EVC for cold start and low load, 20,21 are not considered. The pressure inflow and pressure outflow boundaries were used in this study, as for most engine applications.…”

Section: Engine Specificationsmentioning

confidence: 99%

Numerical investigation of the influence of intake valve lift profile on a diesel premixed charge compression ignition engine with a variable valve actuation system at moderate loads and speeds

Jia

Xie

Wang

2012

International Journal of Engine Research

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Variable valve actuation is attracting increasing attention for the control of diesel premixed charge compression ignition engines due to its fast-response characteristics. In this study, a three-dimensional computational fluid dynamics model, coupled with detailed chemical kinetics, is used to evaluate the influence of the intake valve lift profile on combustion and emissions of a diesel premixed charge compression ignition engine at moderate loads and speeds. The results indicate that, among all the tested variable valve actuation strategies, late intake valve closing shows the most potential for control of ignition timing and reduction of nitrogen oxide emissions, while maintaining low soot emissions and fuel consumption. A moderate decrease of intake valve lift is beneficial for the reduction of soot emissions without significant impacts on fuel consumption due to the enhanced intake flow. The enhancement of turbulence kinetic energy of the in-cylinder mixture is helpful for fuel/air mixing and soot reduction. However, the strategies for increasing turbulence kinetic energy by using intake valve reopening around the start of injection timing and one intake valve deactivation lead to deterioration in fuel efficiency due to the increased pumping work. In general, the increase of swirl ratio with various variable valve actuation strategies impedes the fuel/air mixing, resulting in rapid increases of soot emissions, and a lower swirl ratio is more beneficial for mixing and combustion in diesel premixed charge compression ignition engines with early injection timing.

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Section: Engine Specificationsmentioning

confidence: 99%

Numerical investigation of the influence of intake valve lift profile on a diesel premixed charge compression ignition engine with a variable valve actuation system at moderate loads and speeds

Jia

Xie

Wang

2012

International Journal of Engine Research

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“…m f is the injected fuel mass, and AFR s is the stoichiometric air/fuel ratio. The cylinder mass writes (see Leroy et al (2009)…”

Section: Appendix a Exhaust Modelingmentioning

confidence: 99%

Transient Burned Gas Rate Control on VVA equipped Diesel Engines

Leroy

Chauvin

Petit

2010

IFAC Proceedings Volumes

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This paper addresses the problem of cylinder burned gas rate transient control of VVA equipped Diesel engines. This problem is of importance for NO x emissions reduction. The proposed strategy coordinates existing low-level intake manifold burned gas rate and VVA controllers. To determine relevant control actions, a model of cylinder filling phenomenon is determined. It expresses, under the form of a discrete event dynamics, the behavior of the cylinder burned gas rate at intake valve closure. Interestingly, the model is invertible, thanks to its analytical nature. This property directly suggests an inverse formula that serves as control law. The strategy is efficient as is highlighted by experimental results obtained on a 1.6 L Diesel engine test bench. As a result, NO x emissions are largely diminished during transients.

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Control-oriented aspirated masses model for variable-valve-actuation engines

Leroy

Chauvin

2013

Control Engineering Practice

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In-cylinder Burned Gas Rate Estimation and Control on VVA Diesel Engines

Cited by 5 publications

References 10 publications

Numerical investigation of the influence of intake valve lift profile on a diesel premixed charge compression ignition engine with a variable valve actuation system at moderate loads and speeds

Numerical investigation of the influence of intake valve lift profile on a diesel premixed charge compression ignition engine with a variable valve actuation system at moderate loads and speeds

Transient Burned Gas Rate Control on VVA equipped Diesel Engines

Control-oriented aspirated masses model for variable-valve-actuation engines

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