Determination and Representation of Turbocharger Thermodynamic Efficiencies

Máček, Ján; Vítek, Oldřich

doi:10.4271/2016-01-1042

Cited by 5 publications

(8 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar approaches can be found in [12,13] for determining the TDC by referencing an offset in the location of the TDC instead of an offset in the pressure level.…”

Section: Applications Based On a Polytropic Evolutionmentioning

confidence: 94%

“…Engine D: Engine D was developed from a heavy-duty truck engine for studying the autoignition of a mixture composed from two different fuels (RCCI) [9][10][11][12][13][14]. The detailed geometry of the bowl is shown in Figure 4 The engine was equipped with port fuel gasoline and direct diesel injection systems, having both injection systems a specific hardware for controlling them.…”

Section: Enginesmentioning

confidence: 99%

“…Exhaust temperature is an important parameter for engine control: an accurate and fast estimation of the exhaust gases temperature permits maintaining non-damaging exhaust conditions [11]; turbocharger and after-treatment systems control and optimization require an exhaust temperature measurement or estimation [12][13][14], since turbine available power and catalyst light-off strongly depends on temperature; and finally, EGR rate observers and models rely on exhaust gases temperature to estimate its value [15,16].…”

Section: Exhaust Temperature Estimationmentioning

confidence: 99%

“…In-cylinder pressure sensors offer a direct measurement of the combustion process, and a wide range of applications exist for its use: combustion detection [2], knock detection [3,4], noise control [5,6], fuel tolerance diagnostics [7], combustion control in both, next cycle [8] and same cycle approach [9], emissions dispersion [10], mass composition estimation [11], TDC determination [12,13], EOC detection [14], among others.…”

Section: Introductionmentioning

confidence: 99%

“…However, an accurate intake composition estimation in engines working with new combustion concepts will be necessary not only for emissions control, but also for combustion stability [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

In-cylinder pressure resonance analysis for trapped mass estimation in automotive engines

Moreno¹

View full text Add to dashboard Cite

“…Similar approaches can be found in [12,13] for determining the TDC by referencing an offset in the location of the TDC instead of an offset in the pressure level.…”

Section: Applications Based On a Polytropic Evolutionmentioning

confidence: 94%

Section: Enginesmentioning

confidence: 99%

Section: Exhaust Temperature Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

In-cylinder pressure resonance analysis for trapped mass estimation in automotive engines

Moreno¹

View full text Add to dashboard Cite

In-cylinder pressure based model for exhaust temperature estimation in internal combustion engines

Guardiola

Olmeda

Plá

et al. 2017

Applied Thermal Engineering

View full text Add to dashboard Cite

Exhaust temperature is a valuable parameter for engine control. However, measurement conditions at the engine exhaust and the slow dynamic response of temperature sensors difficult the determination of the instantaneous exhaust temperature. The present paper proposes a methodology for estimating the exhaust temperature exclusively relying in-cylinder pressure signal, engine speed and exhaust lambda.The presented methodology can replace or actualize widespread look-up table models for correcting calibration offsets, due to ageing, sensor bias or disturbances associated with the engine operation. The method uses the existence of resonant modes in the in-cylinder pressure for inferring the trapped mass and the in-cylinder temperature. An isentropic expansion of the gasses through the valves is assumed for estimating the cylinder outlet temperature of the gases, and the gas temperature drop along the exhaust runner and manifold is modelled through a nodal thermal model. The method was compared with current models under steady and transient conditions in a four stroke CI engine. Variations of injection, EGR, intake pressure and rail pressure were performed under steady operation and the transient response of the method was validated under specific transient test and at the WLTP cycle. A time invariant first order model was used for comparing the estimated temperature with that provided by the experimental sensors.

show abstract

Parametric Analysis and Optimization for Thermal Efficiency Improvement in a Turbocharged Diesel Engine with Peak Cylinder Pressure Constraints

Li,

Mao,

Yue

et al. 2023

Energies

View full text Add to dashboard Cite

While the original equipment manufacturers are developing engines that can withstand higher PCP, the methodology to maximize the thermal efficiency gain with different PCP limits is still not well-known or documented in the literature. This study aims to provide guidance on how to co-optimize air system parameters, compression ratio, and intake valve closing (IVC) timing of heavy-duty turbocharged diesel engines to enhance thermal efficiency with peak cylinder pressure (PCP) constraints. In this study, a one-dimensional turbocharged engine model is established and validated by experimental data. The effects of turbocharger efficiency, boost pressure, high-pressure exhaust gas recirculation (HP EGR) ratio, compression ratio (CR), and IVC timing on diesel engine efficiency are assessed under PCP constraints through parametric analysis. The results indicate that for enhancing engine thermal efficiency under limited PCP, an increment in boost pressure and CR, and late IVC timing compared to baseline is required. By multiple parameter optimization, the best parameter combination under different PCP constraints is proposed. At a PCP limit of 20 MPa, the combination of a compression ratio of 18.57, boost pressure of 298 kPa, and IVC timing of −95.2 °CA ATDC yields a 1.56% (absolute value) improvement in ITEn over the baseline condition. Raising the PCP limits from 20 MPa to 25 MPa requires increasing the compression ratio to 21.92, boost pressure to 308 kPa, and delaying the intake valve closing timing to −88.7 °CA ATDC, which results in an absolute improvement of 0.86% in ITEn. Baseline engine configuration is updated accordingly to validate the thermal efficiency improvement strategy at a 25 MPa PCP limitation. Experimental results demonstrate a 2.2% (absolute value) improvement in brake thermal efficiency and 1.98% (absolute value) improvement in overall energy efficiency.

show abstract

Determination and Representation of Turbocharger Thermodynamic Efficiencies

Cited by 5 publications

References 44 publications

In-cylinder pressure resonance analysis for trapped mass estimation in automotive engines

In-cylinder pressure resonance analysis for trapped mass estimation in automotive engines

In-cylinder pressure based model for exhaust temperature estimation in internal combustion engines

Parametric Analysis and Optimization for Thermal Efficiency Improvement in a Turbocharged Diesel Engine with Peak Cylinder Pressure Constraints

Contact Info

Product

Resources

About