Modeling Fresh Air Charge and Residual Gas Fraction on a Dual Independent Variable Valve Timing SI Engine

Leroy, Thomas; Alix, G.; Chauvin, Jonathan; Duparchy, A.; Berr, F. Le

doi:10.4271/2008-01-0983

Cited by 40 publications

(26 citation statements)

References 8 publications

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“…To estimate the flow rate quantities given in (3), the model of aspirated air mass presented in [20] is used. In this model, D asp is described as a function of the engine speed N e , the manifold pressure P int and the intake and exhaust VVT actuators positions.…”

Section: A Flow Rate Modelingmentioning

confidence: 99%

Prediction-based trajectory tracking of external gas recirculation for turbocharged SI engines

Bresch‐Pietri¹,

Leroy²,

Chauvin³

et al. 2012

2012 American Control Conference (ACC)

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Abstract-This paper addresses the trajectory tracking problem of intake burned gas rate for Spark Ignited engines. We propose a simple linear time-varying input delay model of this dynamics, where the delay is represented by an implicit integral equation involving the past values of the input. We extend some recent results from the literature to design a novel predictor-based controller and compare the merits of the proposed technique with the ones of previous works from the literature. Simulation results stress the relevance of this preliminary work and directions of future work are provided.

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Section: A Flow Rate Modelingmentioning

confidence: 99%

Prediction-based trajectory tracking of external gas recirculation for turbocharged SI engines

Bresch‐Pietri¹,

Leroy²,

Chauvin³

et al. 2012

2012 American Control Conference (ACC)

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“…In VVT engines, this simple relation can no longer be used, since VVT actuators drastically affect the in-cylinder air mass. A model using the positions of the VVT actuators has been presented by Leroy, Chauvin, Le Berr et al (2008). This models the aspirated air mass in the cylinder using geometrical engine parameters, and gives…”

Section: Balance In the Intake Manifoldmentioning

confidence: 99%

“…Thus, VVT has an impact on the volumetric efficiency of the aspiration from the intake manifold into the cylinders (see Heywood, 1988). Its influence can be modeled (see Colin, Chamaillard, Bloch, & Corde, 2007;Leroy, Chauvin, Le Berr, Duparchy, & Alix, 2008; Stefanopoulou, Cook, Grizzle, & Freudenberg, 1998, for example), but errors cannot be avoided, leading to in-cylinder prediction errors, which unavoidably propagate, through feedforward terms, into the FAR management system. This issue generates pollution peaks and results in poor driveability.…”

Section: Control Problemmentioning

confidence: 99%

Motion planning for experimental air path control of a variable-valve-timing spark ignition engine

Leroy

Chauvin

Petit

2009

Control Engineering Practice

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a b s t r a c tAir path control of a spark ignition engine without an EGR loop, equipped with variable-valve-timing (VVT) actuators, is addressed in this paper. VVT devices are used to produce internal exhaust gas recirculation, providing beneficial effects in terms of fuel consumption and pollutant emissions reduction. However, VVT actuators affect the fresh air charge in the cylinders. This has an impact on the torque output (leading to driveability problems) and on the fuel/air ratio (FAR) (leading to pollution peaks). To compensate for these undesirable effects, a new approach is proposed. Supportive experimental results show the relevance of this approach.

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“…Model presentation -Following [9], m asp is the reference variable for our in-cylinder composition model. Letm ivc , m asp andm iegr be respectively the estimates of m ivc , m asp and m iegr .…”

Section: ×60mentioning

confidence: 99%

“…The two look-up tables α 1 and α 2 are determined as follows. Each point of the look-up tables (constant intake manifold pressure and constant engine speed), are obtained by fitting model (9) to reference data m asp , through a standard linear regression. Look-up tables α 1 and α 2 are presented in Figure 5.…”

Section: ×60mentioning

confidence: 99%

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

Leroy¹,

Bitauld²,

Chauvin³

et al. 2009

SAE Technical Paper Series

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In this paper, we propose a strategy to control the incylinder burned gas rate inside the combustion chambers of turbocharged Diesel engines equipped with low pressure EGR loop and VVA actuator. We first design a mean-value model of the in-cylinder composition and validate it on a high frequency reference simulator. Then, we develop the control strategy. It is based on the coordination of existing low-level controllers acting separately on the EGR valve and on the VVA actuator. The objective is to improve transient response, taking into account the responses of the low-level controllers. Supportive simulation results show the relevance of this approach.

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Modeling Fresh Air Charge and Residual Gas Fraction on a Dual Independent Variable Valve Timing SI Engine

Cited by 40 publications

References 8 publications

Prediction-based trajectory tracking of external gas recirculation for turbocharged SI engines

Prediction-based trajectory tracking of external gas recirculation for turbocharged SI engines

Motion planning for experimental air path control of a variable-valve-timing spark ignition engine

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

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