Adaptive Air Charge Estimation for Turbocharged Diesel Engines Without Exhaust Gas Recirculation

Storset, O.F.; Stefanopoulou, Anna G.; Smith, Roy S.

doi:10.1115/1.1771691

Cited by 14 publications

(12 citation statements)

References 24 publications

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“…Guzzella and Onder [10] advocate the use of 2D lookup tables to quantify volumetric efficiency. In references [11] and [12], the volumetric efficiency is modelled as a function of engine speed, intake manifold pressure, and temperature. Usage of these types of models has also become prevalent in gas exchange simulation models such as those described by Kocher et al [13], Stefanopoulou et al [14], and Jankovic et al [15] which aim to utilize physical relationships to describe the gas exchange process but have stopped short of incorporating physically based volumetric efficiency models.…”

Section: Introductionmentioning

confidence: 99%

Physically based volumetric efficiency model for diesel engines utilizing variable intake valve actuation

Kocher

Koeberlein

Alstine

et al. 2011

International Journal of Engine Research

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Advanced diesel engine architectures employing flexible valve trains enable emissions reductions and fuel economy improvements. Flexibility in the valve train allows engine designers to optimize the gas exchange process in a manner similar to how common rail fuel injection systems enable optimization of the fuel injection process. Modulating valve timings directly impacts the volumetric efficiency of the engine since it directly controls how much mass is trapped in the cylinders. In fact, it will be shown that the control authority of valve timing modulation over volumetric efficiency, that is, the range of volumetric efficiencies achievable due to modulation of the valve timing, is three times larger than the range achievable by modulation of other engine actuators such as the exhaust gas recirculation valve or the variable geometry turbocharger. Traditional empirical or regression-based models for volumetric efficiency, while suitable for conventional valve trains, are therefore challenged by flexible valve trains. The added complexity and additional empirical data needed for wide valve timing ranges limit the usefulness of these methods. A simple physically based volumetric efficiency model was developed to address these challenges. The model captures the major physical processes occurring over the intake stroke, and is applicable to both conventional and flexible intake valve trains. The model inputs include temperature and pressure in both the intake and exhaust manifolds, intake and exhaust valve event timings, engine cylinder bore, stroke, connecting rod lengths, engine speed, and effective compression ratio. The model is physically based, requires no regression tuning parameters, is generalizable to other engine platforms, and has been experimentally validated using an advanced multi-cylinder diesel engine equipped with a fully flexible variable intake valve actuation system. Experimental data were collected over a wide range of the operating space of the engine and augmented with air handling actuator and intake valve timing sweeps to maximize the range of conditions used to thoroughly experimentally validate the model for a total of 286 operating conditions. The physically based volumetric efficiency model will be shown to predict the experimentally calculated volumetric efficiency to within 5 per cent for all cases with a root mean square error of less than 2.5 per cent for the entire dataset. The physical model developed differs from previous physical modelling work through the novel application of effective compression ratio, incorporation of no tuning parameters, and extensive validation on a unique engine test bed with fully flexible intake valve actuation.

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Section: Introductionmentioning

confidence: 99%

Physically based volumetric efficiency model for diesel engines utilizing variable intake valve actuation

Kocher

Koeberlein

Alstine

et al. 2011

International Journal of Engine Research

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“…The cylinder is simply treated as a material exchange channel for the intake manifold and the exhaust manifold. The dynamic characteristics of the cylinder are neglected, Assuming that the engine speed is as a known input, the mass flow into the cylinder can be calculated by speed density equation [17]:…”

Section: Cylindermentioning

confidence: 99%

Model-Based State Feedback Controller Design for a Turbocharged Diesel Engine with an EGR System

et al. 2015

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This paper describes a method for the control of transient exhaust gas recirculation (EGR) systems. Firstly, a state space model of the air system is developed by simplifying a mean value model. The state space model is linearized by using linearization theory and validated by the GT-Power data with an operating point of the diesel engine. Secondly, a state feedback controller based on the intake oxygen mass fraction is designed for EGR control. Since direct measurement of the intake oxygen mass fraction is unavailable on the engine, the estimation method for intake oxygen mass fraction has been proposed in this paper. The control strategy is analyzed by using co-simulation with the Matlab/Simulink and GT-Powers software. Finally, the whole control system is experimentally validated against experimental data of a turbocharged diesel engine. The control effect of the state feedback controller compared with PID controller proved to be further verify the feasibility and advantages of the proposed state feedback controller.

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“…Several of the charge flow estimation schemes developed have been based on Luenberger estimation techniques (e.g. [21], [22], [23]). For estimation of a "slowly" varying variable, the system state vector may be augmented to include that variable, with its time derivative assumed to be zero.…”

Section: Development Of a High Gain Observer For Ecr Estimationmentioning

confidence: 99%

Effective compression ratio estimation in engines with flexible intake valve actuation

Stricker

Kocher

Koeberlein

et al. 2012

2012 American Control Conference (ACC)

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The ability to modulate the effective compression ratio (ECR) of an engine is a key enabler of advanced combustion strategies. ECR is a measure of the effective incylinder compression of gases above intake manifold conditions. An engine's ECR is usually computed from in-cylinder pressure data, requiring reliable in-cylinder pressure sensors that are not typically found on production engines. As such, a method is needed for determining the effective compression ratio using only information available from stock engine sensors, including manifold pressures and temperatures and air flows. The work outlined here presents a strategy for estimating the ECR without need for in-cylinder pressure data. The estimation scheme was transiently tested and compared to experimental engine data from a unique diesel engine test bed with flexible intake valve actuation, and was able to converge within 3 engine cycles after a transient event with less than 6% average steadystate error compared to experimental engine data.

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Adaptive Air Charge Estimation for Turbocharged Diesel Engines Without Exhaust Gas Recirculation

Cited by 14 publications

References 24 publications

Physically based volumetric efficiency model for diesel engines utilizing variable intake valve actuation

Physically based volumetric efficiency model for diesel engines utilizing variable intake valve actuation

Model-Based State Feedback Controller Design for a Turbocharged Diesel Engine with an EGR System

Effective compression ratio estimation in engines with flexible intake valve actuation

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