The Thermodynamic Design, Analysis and Test of Cummins’ Supertruck 2 50% Brake Thermal Efficiency Engine System

Mohr, Daniel; Shipp, Timothy; Lu, Xueting

doi:10.4271/2019-01-0247

Cited by 16 publications

(11 citation statements)

References 6 publications

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“…Achieving compliance with the 2017 GHG emissions and 2020-future (2020+) expectations would definitely enhance engine efficiency gains. Cummins Inc. engaged in developing a new HD diesel engine delivering greater than 50% BTE under the SuperTruck program goals [83]. A system-level optimization was undertaken, mainly focused on increased compression ratio; higher injection rate; carefully matched, highly efficient turbocharging; variable lube oil pumps; variable cooling components; and low restriction after treatment.…”

Section: Energy Distribution and Efficiency In Modern Icesmentioning

confidence: 99%

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Wang

Shuai

et al. 2021

Energies

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Today, the problem of energy shortage and climate change has urgently motivated the development of research engaged in improving the fuel efficiency of internal combustion engines (ICEs). Although many constructive alternatives—including battery electric vehicles (BEVs) and low-carbon fuels such as biofuels or hydrogen—are being put forward, they are starting from a very low base, and still face significant barriers. Nevertheless, 85–90% of transport energy is still expected to come from combustion engines powered by conventional liquid fuels even by 2040. Therefore, intensive passion for the improvement of engine thermal efficiency and decreasing energy loss has driven the development of reliable approaches and modelling to fully understand the underlying mechanisms. In this paper, literature surveys are presented that investigate the relative advantages of technologies mainly focused on minimizing energy loss in engine assemblies, including pistons and rings, bearings and valves, water and oil pumps, and cooling systems. Implementations of energy loss reduction concepts in advanced engines are also evaluated against expectations of meeting greenhouse gas (GHG) emissions compliance in the years to come.

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Section: Energy Distribution and Efficiency In Modern Icesmentioning

confidence: 99%

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Wang

Shuai

et al. 2021

Energies

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“…10 As another example of state-of-the-art efforts toward 55% + BTE, Cummins has conducted a system-level optimization consisting of increased compression ratio, higher injection rate, matched high-efficiency turbocharging, variable lube oil pump, variable cooling components, and a waste-heat recover system to deliver target efficiency at one specific test point. 14 It is worth noting that all the peak BTE from the literature is achieved at a specific operating point, or the so-called ''sweet spot.'' For example, Cummins demonstrates that its engine reaches over 55% BTE at approximately 1300 NÁm and 1400 rpm (revolutions per minute).…”

Section: Introductionmentioning

confidence: 99%

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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“…Since the invention of the first CI engine, there has been many improvements which have pushed commercially available compression ignition HD brake thermal efficiency (BTE) to approximately 43 to 46% [13]. The work completed by Mohr et al on the Super Truck 2 initiative proved that HD diesel engines could reach BTE of 49.9% on class 8 trucks [14]. The improvements of CI engines come from a variety of different improvements including manufacturing tolerances, turbocharger improvements, reduced friction, electronic fuel delivery and control, and many others.…”

Section: Compression Ignition Engine Overviewmentioning

confidence: 99%

“…14 shows the results from the torsional stiffness testing completed for the two-piece driveshaft as well as the manufacturers specification. It was determined that the value reported by the manufacturer was slightly higher than the measured values, possibly due to wear within the damper during prior engine testing.…”

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confidence: 99%

Design, Build, and Analysis of a Compressed Natural Gas Direct Injection Compression Ignition Single Cylinder Research Engine

Miller¹

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The Thermodynamic Design, Analysis and Test of Cummins’ Supertruck 2 50% Brake Thermal Efficiency Engine System

Cited by 16 publications

References 6 publications

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

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

Design, Build, and Analysis of a Compressed Natural Gas Direct Injection Compression Ignition Single Cylinder Research Engine

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