Analytical Comparison of a Turbocharged Conventional Diesel and a Naturally Aspirated Compact Compression Ignition Engine both Sized for a Highway Truck

Clarke, J. M.; O'Malley, Edward

doi:10.4271/2013-01-1736

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…Among the more recent ones are the Scuderi split cycle (SSC) engine [8], the compact compression ignition (CCI) engine [9], "CryoPower" cryogenic split-cycle engine concept…”

Section: Split-cycle Engine Conceptsmentioning

confidence: 99%

Isobaric Combustion: A Potential Path to High Efficiency, in Combination with the Double Compression Expansion Engine (DCEE) Concept

Babayev

Houidi

Andersson

et al. 2019

SAE Technical Paper Series

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“…Among the more recent ones are the Scuderi split cycle (SSC) engine [8], the compact compression ignition (CCI) engine [9], "CryoPower" cryogenic split-cycle engine concept…”

Section: Split-cycle Engine Conceptsmentioning

confidence: 99%

Isobaric Combustion: A Potential Path to High Efficiency, in Combination with the Double Compression Expansion Engine (DCEE) Concept

Babayev

Houidi

Andersson

et al. 2019

SAE Technical Paper Series

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“…To optimize the individual efficiencies, a wide variety of splitcycle engine concept has been investigated ranging from the "series XIV-engine" [18], the compact compression ignition (CCI) engine [19], the Scuderi engine [20], the "CryoPower" engine [21] and the double compression expansion engine (DCEE) [22]. The series XIV-engine comprises of two conventional combustion cylinders and one large low-pressure cylinder.…”

Section: Introductionmentioning

confidence: 99%

Isobaric Combustion at a Low Compression Ratio

Dyuisenakhmetov

Goyal

Houidi

et al. 2020

SAE Technical Paper Series

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In a previous study, it was shown that isobaric combustion cycle, achieved by multiple injection strategy, is more favorable than conventional diesel cycle for the double compression expansion engine (DCEE) concept. In spite of lower effective expansion ratio, the indicated efficiencies of isobaric cycles were approximately equal to those of a conventional diesel cycle. Isobaric cycles had lower heat transfer losses and higher exhaust losses which are advantageous for DCEE since additional exhaust energy can be converted into useful work in the expander. In this study, the performance of low-pressure isobaric combustion (IsoL) and high-pressure isobaric combustion (IsoH) in terms of gross indicated efficiency, energy flow distribution and engine-out emissions is compared to the conventional diesel combustion (CDC) but at a relatively lower compression ratio of 11.5. The experiments are conducted in a Volvo D13C500 single-cylinder heavy-duty engine using standard EU diesel fuel. The current study consists of two sets of experiments. In the first set, the effect of exhaust gas recirculation (EGR) is studied at different combustion modes using the same air-fuel ratio obtained from the preceding work. In the second set of experiments, different injection strategies are investigated for IsoL and IsoH combustion at constant and varying load conditions. From the results, it is found that isobaric combustion has similar or higher gross indicated efficiency than those of CDC. The exhaust losses are higher while the heat transfer losses are lower than CDC, which could be beneficial for DCEE concept. For isobaric cases, the NOx emissions were lower with higher uHC/CO/Soot emissions compared to CDC. From the injection strategy study, it was found that the gross indicated efficiency is highest with three injections i.e. at medium load. The efficiency is lower for both low and high load conditions due to increased exhaust and heat transfer losses, respectively. Also, the gross indicated efficiency is largely unchanged when more than one injection event is executed; however the IsoL yields higher overall emissions as compared to IsoH combustion.

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“…Due to massive heat losses, the thermodynamic efficiency of this engine was very poor. A more recent split-cycle concept is the Compact Compression Ignition (CCI) engine [2]. It uses 3 different types of cylinders, an intake cylinder, a combustion cylinder and an exhaust cylinder.…”

Section: Other Split-cycle Engine Concepts Of Todaymentioning

confidence: 99%

“…(2) Figure 12 presents the FMEP as function of PCP described by eq (2). This is a crude model and assumes that the engine will be redesigned for each new peak pressure level but it will still give an indication of what can be achieved for a given peak pressure level.…”

Section: Simulations Of the Dcee Concept Are Performed With A Stroke mentioning

confidence: 99%

Double Compression Expansion Engine Concepts: A Path to High Efficiency

Lam

Tunér

Tunestål

et al. 2015

SAE Int. J. Engines

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Reducing carbon-dioxide emission (CO 2) is one of the most important challenges of today to overcome. A major source of CO 2-emission comes from the usage of internal combustion engines in vehicles to transport people and goods. This emission is directly proportional to fuel consumption. In order to reduce CO 2-emissions, European Union legislations state that by 2015, the fleet averaged CO 2-emissions from a passenger car manufacturer is limited to 130g/ km. Reaching 2020 the limitations are even tougher, a fleet average of only 95g/km is allowed. If a manufacturer fails to meet these requirements, the manufacturer has to pay "excess emissions premiums" for every car registered, basically a penalty-tax if the requirements are not fulfilled. Fuel consumption is even more important for engines used in heavy trucks. These vehicles travel longer annual distances, making fuel cost a significantly larger part of total costs compared to a passenger car. Hence, improvements in fuel economy are highly desired. Improving engine brake efficiency is vital in order to achieve these requirements. Brake efficiency (η b), is the function of four parts: combustion (η c), thermodynamic (η t), gas-exchange (η ge) and mechanical (η m). All of these efficiencies need to be high in order to reach high brake efficiency. Definitions of these efficiencies are presented in Figure 1. Further information and definitions of the variables used in Figure 1 are presented in appendix A.

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Analytical Comparison of a Turbocharged Conventional Diesel and a Naturally Aspirated Compact Compression Ignition Engine both Sized for a Highway Truck

Cited by 9 publications

References 6 publications

Isobaric Combustion: A Potential Path to High Efficiency, in Combination with the Double Compression Expansion Engine (DCEE) Concept

Isobaric Combustion: A Potential Path to High Efficiency, in Combination with the Double Compression Expansion Engine (DCEE) Concept

Isobaric Combustion at a Low Compression Ratio

Double Compression Expansion Engine Concepts: A Path to High Efficiency

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