Influence of the Variable Valve Timing Strategy on the Control of a Homogeneous Charge Compression (HCCI) Engine

Milovanović, Nebojša; Chen, Rui; Turner, J. W. G.

doi:10.4271/2004-01-1899

Cited by 72 publications

(21 citation statements)

References 22 publications

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“…This can be achieved by controlling the amount of residual gases trapped in the cylinders. Two major residual-controlling strategies have been investigated: The first one is an exhaust gas retention strategy usually referred to as recompression, and the second one is an exhaust gas reinduction strategy usually referred to as rebreathing [6,7]. Recompression employs negative valve overlap in order to trap exhaust gases in the cylinders, while rebreathing employs a secondary exhaust valve event after the main exhaust valve event to allow the reinduction of exhaust gases into the cylinders.…”

Section: Comparison Of Different Boosting Strategies For Homogeneous mentioning

confidence: 99%

Comparison of Different Boosting Strategies for Homogeneous Charge Compression Ignition Engines - A Modeling Study

Mamalis¹,

Nair²,

Andruskiewicz³

et al. 2010

SAE Int. J. Engines

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Boosted Homogeneous Charge Compression Ignition (HCCI) has been modeled and has demonstrated the potential to extend the engine's upper load limit. A commercially available engine simulation software (GT-Power®) coupled to the University of Michigan HCCI combustion and heat transfer correlations was used to model a 4-cylinder boosted HCCI engine with three different boosting configurations: turbocharging, supercharging and series turbocharging. The scope of this study is to identify the best boosting approach in order to extend the HCCI engine's operating range. The results of this study are consistent with the literature: Boosting helps increase the HCCI upper load limit, but matching of turbochargers is a problem. In addition, the low exhaust gas enthalpy resulting from HCCI combustion leads to high pressures in the exhaust manifold increasing pumping work. The series turbocharging strategy appears to provide the largest load range extension. Single turbocharging is the most efficient but is limited by increased mass flow rates at increased engine speeds. Supercharging helps avoid the backpressure problem but the mechanical work of the supercharger reduces useful work affecting overall brake efficiency.

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Section: Comparison Of Different Boosting Strategies For Homogeneous mentioning

confidence: 99%

Comparison of Different Boosting Strategies for Homogeneous Charge Compression Ignition Engines - A Modeling Study

Mamalis¹,

Nair²,

Andruskiewicz³

et al. 2010

SAE Int. J. Engines

View full text Add to dashboard Cite

show abstract

“…For example, it enables active air management so that it can achieve significant reduction of harmful emissions and improvement of fuel efficiency. Also, it enables advanced combustion such as homogeneous charge compression ignition (HCCI) [4].…”

Section: Introductionmentioning

confidence: 99%

Robust position tracking control of a camless engine valve actuator with time-varying reference frequency

Yoon

Yang

Sun

2014

53rd IEEE Conference on Decision and Control

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This paper presents robust position tracking control of an electro-hydraulic camless engine valve actuator with the reference of time-varying frequency. The valve actuator includes nonlinearities associated with the hydraulic flow and the nonlinear friction. To retain such nonlinearities, the stabilized valve actuator is modeled as a block-structured system using the Volterra series representation. For tracking control design, the extended generating dynamics, which is justified by frequency domain analysis of a feedback system, is applied to the robust time-varying tracking control which is based on the internal model principle. The given tracking control method is illustrated by both simulation and experiments. With the extended generating dynamics, tracking the reference of timevarying frequency shows significant improvement.

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“…For the current study, we selected a compression ratio of 9.5 to match that of the SI engine used for the experimental data. All simulations were performed with naturally aspirated intake conditions and with standard valve timing (i.e., no negative valve overlap [65,66]). In addition, to partially address the differences between the engine used for experimental data and the modeled CFR engine, we quantified load using imep as described previously.…”

Section: Fuel Operating Envelopementioning

confidence: 99%

Investigation of the LTC fuel performance index for oxygenated reference fuel blends

Niemeyer

Daly

Cannella

et al. 2015

Fuel

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A new metric for ranking the suitability of fuels in LTC engines was recently introduced, based on the fraction of potential fuel savings achieved in the FTP-75 light-duty vehicle driving cycle. In the current study, this LTC fuel performance index was calculated computationally and analyzed for a number of fuel blends comprised of n-heptane, isooctane, toluene, and ethanol in various combinations and ratios corresponding to octane numbers from 0 to 100. In order to calculate the LTC index for each fuel, computational driving cycle simulations were first performed using a typical light-duty passenger vehicle, providing pairs of engine speed and load points. Separately, for each fuel blend considered, single-zone naturally aspirated HCCI engine simulations with a compression ratio of 9.5 were performed in order to determine the operating envelopes. These results were combined to determine the varying improvement in fuel economy offered by fuels, forming the basis for the LTC fuel index. The resulting fuel performance indices ranged from 36.4 for neat n-heptane (PRF0) to 9.20 for a three-component blend of n-heptane, isooctane, and ethanol (ERF1). For the chosen engine and chosen conditions, in general lower-octane fuels performed better, resulting in higher LTC fuel index values; however, the fuel performance index correlated poorly with octane rating for less-reactive, higher-octane fuels.

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Influence of the Variable Valve Timing Strategy on the Control of a Homogeneous Charge Compression (HCCI) Engine

Cited by 72 publications

References 22 publications

Comparison of Different Boosting Strategies for Homogeneous Charge Compression Ignition Engines - A Modeling Study

Comparison of Different Boosting Strategies for Homogeneous Charge Compression Ignition Engines - A Modeling Study

Robust position tracking control of a camless engine valve actuator with time-varying reference frequency

Investigation of the LTC fuel performance index for oxygenated reference fuel blends

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