Fast Predictive Oxygen Charge Control of a Diesel Engine

Langthaler, Peter; Re, Luigi del

doi:10.1109/acc.2007.4282902

Cited by 19 publications

(12 citation statements)

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“…One critical component of the control strategy is the choice of the reference quantity used to define the operating point, and frequently this has been the fresh air mass flow and the boost pressure in the intake manifold ( [5], [6]) or in the exhaust manifold ( [4]). As an alternative, several authors propose to use the intake oxygen concentration in combination with the boost pressure ( [7], [8]). Another approach presented in [9] proposes the unburnt mass fraction in the intake manifold and the air to fuel ratio as references for a MIMO airpath control.…”

Section: Introductionmentioning

confidence: 99%

Reliable reference determination for diesel engine emission control

Waschl

Alberer

Kerschbaummayr

et al. 2012

2012 American Control Conference (ACC)

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To meet the current and upcoming emission legislation, engine air system control is a crucial aspect. To this end different approaches from SISO control in combination with feedforward structures up to advanced MIMO strategies are proposed in the literature. However, for each control strategy a reference quantity is necessary. Although it seems sensible to directly use the exhaust emission concentrations in a closed loop control, unfortunately a fast and accurate online measurement is seldom available. A typical approach to circumvent this issue is to use auxiliary quantities like fresh air mass flow, whereas the according reference values for these quantities are obtained during engine development. This paper presents a different approach where not only one but a combination of different candidates is used to define an optimal reference for the EGR valve control. The target for the overall control is to maintain a constant nitric oxides (N Ox) level during steady state operation without explicit N Ox measurement. Furthermore, a scheduling method is proposed to take into account the expected errors on the sensor signals depending on the current operating region. Finally the control was applied on a mean value engine simulation model and showed satisfactory results.

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Section: Introductionmentioning

confidence: 99%

Reliable reference determination for diesel engine emission control

Waschl

Alberer

Kerschbaummayr

et al. 2012

2012 American Control Conference (ACC)

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“…When the air and the EGR gas are not properly mixed in the intake manifold, the lambda sensor can provide a measurement which is not representative of the mean oxygen concentration in the intake manifold. While the problem of the pressure correction has been properly addressed, for example in [30], the authors have not find studies considering the problem of the sensor positioning.…”

Section: Sensor Selectionmentioning

confidence: 99%

“…Despite the EGR fraction can be estimated using observers [12], heated wide range lambda sensors may be used for measuring the oxygen concentration in the intake manifold [30]. Since those sensors are sensitive to pressure, the measured signal has to be corrected to avoid the effects of the intake manifold pressure.…”

Section: Sensor Selectionmentioning

confidence: 99%

“…The existence of such effects in the HP-EGR system, along with sign reversals and saturations in the actuators authority [36], significantly complicate its control. In order to deal with it, some authors have proposed using non-linear compensators [29], or a model-based approach that shifts between different controllers according to the EGR valve position, engine speed and load [30]; however, in many industrial applications, air mass flow and boost pressure are not closed-loop controlled at the same time, in order to improve system robustness [37]. The results obtained when modelling the LP-EGR, and the almost decoupled behaviour of the EGR and VGT, suggest that easier control solutions may be used.…”

Section: Hp-egr Architecturementioning

confidence: 99%

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Considerations on the low-pressure exhaust gas recirculation system control in turbocharged diesel engines

Luján

Guardiola

Plá

et al. 2013

International Journal of Engine Research

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Although high pressure exhaust gas recirculation has been commonly used in turbocharged diesel engines for controlling the NOx formation, recent advances in after-treatment and material technology make possible using a low pressure architecture, which recirculates the exhaust gas upstream the compressor. This brief paper presents a basic study of control aspect related to the low pressure architecture, emphasising the similarities and differences with the high pressure system. Data coming from experimental tests with both configurations, and from a one-dimensional wave action model simulations, are combined for the analysis of the input-output paring, linearity and the transient performance of both systems.

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“…A wide range of real-time oxygen concentration prediction models have been studied, including models derived from the first law of thermodynamics (Ammann et al, 2003;Canova et al, 2009;van Nieuwstadt et al, 2000), linear parameter varying models (Jung & Glover, 2006;Wang, 2008;Yan & Wang, 2010), steady-state relationships (Chen & Yanakiev, 2005) and empirical models (Alberer & Del Re, 2009;Langthaler & Del Re, 2007;2008). All of these approaches are based on zero-dimensional system descriptions and therefore do not account for the time-varying transport delays which characterize the air path system.…”

Section: Delay Based Oxygen Dynamics Modelingmentioning

confidence: 99%