Miller-PCCI Combustion in an HSDI Diesel Engine with VVT

Murata, Yutaka; Kusaka, Jin; Daisho, Yasuhiro; Kawano, Daisuke; Suzuki, Hisakazu; Ishii, Hajime; Goto, Yuichi

doi:10.4271/2008-01-0644

Cited by 61 publications

(30 citation statements)

References 22 publications

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“…[11] showed that ECR reductions via early IVC, coupled with early fuel injection and modest amounts of EGR, large reductions in NOx emissions were seen without penalties on fuel economy. Several other efforts report similar results of lower NOx emissions through use of reduced effective compression ratio, via either early or late IVC modulation [8], [12], [13], [14]. It is evident that careful coordination of valve events and the effective compression ratio is key for closed-loop targeting of advanced combustion strategies, and implementing these strategies real-time requires knowledge of the effective compression ratio.…”

Section: Introductionmentioning

confidence: 54%

“…The estimated volumetric efficiency in Equation 13 can then be used in the speed-density equation (Equation 8) to estimate charge flow:…”

Section: B Estimation Of Volumetric Efficiency and Charge Flowmentioning

confidence: 99%

“…Once an estimate for volumetric efficiency is obtained via Equation 13, it is used to estimate the effective compression ratio. A static volumetric efficiency equation developed in [19] is given by Equation 16.…”

Section: Estimation Of Effective Compression Ratiomentioning

confidence: 99%

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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.

show abstract

Section: Introductionmentioning

confidence: 54%

“…The estimated volumetric efficiency in Equation 13 can then be used in the speed-density equation (Equation 8) to estimate charge flow:…”

Section: B Estimation Of Volumetric Efficiency and Charge Flowmentioning

confidence: 99%

See 1 more Smart Citation

Effective compression ratio estimation in engines with flexible intake valve actuation

Stricker

Kocher

Koeberlein

et al. 2012

2012 American Control Conference (ACC)

View full text Add to dashboard Cite

show abstract

“…Some studies also presented improvements related to NOx and soot emissions because of the utilization of the VVT mechanism for a wide range of engine speeds and loads [2]. There is still a problem related to HC emissions while the catalytic converter is not warm yet, but the use of strategies as low lift for fuel atomization and overlap control can avoid fuel adhesion to cylinder walls and consequently improve combustion by reducing the amount of unburned fuel [3].…”

Section: Introductionmentioning

confidence: 99%

In-Cylinder Gas Exchange Control Process for Maximizing Fuel Conversion Efficiency

Radicchi¹,

Silva²,

Baêta³

et al. 2017

Blucher Engineering Proceedings

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The use of exhaust gas recirculation in internal combustion engines, obtained by means of variable valve timing techniques, has represented a good alternative to reduce in-cylinder gas emission and the specific fuel consumption, consequently improving thermal efficiency. The control of valves opening and closing times, especially when keeping some overlapping, may permit the residual gases trapping, what makes the cylinder temperatures lower and reduce engine-out emissions, mainly of nitrogen oxides. Besides that, these techniques allow load control, what can eliminate the necessity of throttling and hence pumping losses. Based on this, this paper presents an analysis of the use of variable valve timing focused on trapping some residual gases in a spark ignition engine. It has been used a four valve Single Cylinder Research Engine-SCRE with direct injection. It was adopted a volumetric ratio equal to 15:1, an engine speed of 2500 rpm and the ethanol as fuel. Valves timing were changed taking into account the maximum fraction of exhaust gases which could be used without compromising mixture inflammability. Changes in performance were analyzed and the importance of controlling the amount of recycled exhaust gases was finally evidenced.

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“…Alternative cycles such as Miller or Atkinson [48] in which the intake valves are still open during part of the compression stroke lead to lower pumping work, that finally leads to higher efficiency but also to a penalty in torque/power due to the lower in-cylinder trapped mass. This strategy could be performed using a fixed intake valve lift profile in the whole range of the engine map [48], with a certain penalty in rated power, or along with a VVT system [49] to perform it in the partial load zone, maintaining the conventional cycle in the full load curve.…”

Section: Air Managementmentioning

confidence: 99%

Assessment and optimization of the indicated cycle with a 0D thermodynamic model

Cavero¹

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Issues affecting internal combustion engines, such as pollutant emissions, oil depletion and the raising of alternative powertrains (full electric vehicle), link the future of vehicles powered by this type of powertrain to its improvement in terms of fuel consumption and pollutant emissions. Additionally, the high stringency of the current and upcoming legislation is forcing automotive manufacturers to focus on developing innovative engine strategies aimed to increase the efficiency with low penalty in emissions. A first step to tackle this issue is to focus on the processes occurring in the combustion chamber, which is the core of the engine. Funding acknowledgments Diego Blanco Cavero has been partially supported through contract FPI-S2-2016

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Miller-PCCI Combustion in an HSDI Diesel Engine with VVT

Cited by 61 publications

References 22 publications

Effective compression ratio estimation in engines with flexible intake valve actuation

Effective compression ratio estimation in engines with flexible intake valve actuation

In-Cylinder Gas Exchange Control Process for Maximizing Fuel Conversion Efficiency

Assessment and optimization of the indicated cycle with a 0D thermodynamic model

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