Advanced Combustion for Improved Thermal Efficiency in an Advanced On-Road Heavy Duty Diesel Engine

Vojtech, Ryan

doi:10.4271/2018-01-0237

Cited by 6 publications

(2 citation statements)

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“…Even though thermal efficiency improvement can be achieved by increasing PCP with the above strategy, high PCP leads to durability issues, an increment in manufacturing cost, and increased mechanical losses, which are detrimental to enhancing brake thermal efficiency [19]. Ryan [20] reported that increased CR did not show evident benefits in BTE, owing to increased friction accompanied by a significant increase in PCP. Therefore, considerable research has been conducted on improving thermal efficiency within PCP limits.…”

Section: Introductionmentioning

confidence: 99%

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

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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.

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Section: Introductionmentioning

confidence: 99%

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

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“…The U.S Department of Energy established the SuperTruck program in 2010 and the SuperTruck II program in 2016 to support the U.S. commercial vehicle industry via research, development, and demonstration of HD engine and vehicle efficiency technologies. 7 The main objectives of these programs are to raise brake thermal efficiency (BTE) from 43% to 46% in current production HD diesel engines 8 to above 55%, and eventually to demonstrate such improvement through both engine dynamometer tests and on-road vehicle tests. [9][10][11][12] Within this program, Volvo Group Trucks Technology has developed a novel engine geometry to realize advanced combustion strategies in diesel engines, while considering spray formation and injection schedule along with optimal piston bowl structure.…”

Section: Introductionmentioning

confidence: 99%

Development of in-use engine speed/torque heat maps across multiple heavy-duty commercial vehicle vocations

Zhang

Kelly

Kotz

et al. 2021

International Journal of Engine Research

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The U.S. Department of Energy (DOE) established the SuperTruck program with the goal of achieving brake thermal efficiency (BTE) greater than or equal to 55% as demonstrated in an operational heavy-duty (HD) diesel engine at a 65-miles-per-hour (mph) cruise point. Beyond the line-haul application, HD engines operate in a wide range of speed and torque conditions that are unlikely to yield the same efficiency under real-world operation. Thereby, the in-use engine heat maps described in this paper are a valuable tool to illustrate whether the engine-efficiency “sweet spot” matches the most frequent operating conditions. In this study, NREL developed engine heat maps to quantify the important operating points for various vocations using our Fleet DNA database of commercial fleet vehicle operations data. These heat maps clearly show that high-frequency operating points vary significantly according to vehicle vocation, while only a few of them match the sweet spot. Beyond the illustration, engine in-use heat maps can also be leveraged to build up reduced-order engine-efficiency models, needed by many rapid powertrain simulations. As case studies, nine reduced-order models – including line-haul truck, transfer truck, transit bus, transit bus with compressed natural gas (CNG) engine, drayage, refuse pickup, local delivery, utility truck, and school bus with CNG engine – using a trust-region reflective algorithm to fit the on-road data extracted based on the engine in-use heat maps.

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Future Sustainable Transport Fuels for Indian Heavy Duty Vehicles

Dev

2022

Energy, Environment, and Sustainability

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Advanced Combustion for Improved Thermal Efficiency in an Advanced On-Road Heavy Duty Diesel Engine

Cited by 6 publications

References 0 publications

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

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

Development of in-use engine speed/torque heat maps across multiple heavy-duty commercial vehicle vocations

Future Sustainable Transport Fuels for Indian Heavy Duty Vehicles

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