Turbocharger Matching for a 4-Cylinder Gasoline HCCI Engine Using a 1D Engine Simulation

Shingne, Prasad S.; Assanis, Dennis N.; Babajimopoulos, Aristotelis; Keller, Philip; Roth, David B.; Becker, Michael

doi:10.4271/2010-01-2143

Cited by 10 publications

(13 citation statements)

References 19 publications

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“…A detailed analysis of the turbocharger requirements is beyond the scope of this paper. For additional information regarding turbocharger matching for HCCI operation, see reference [26].…”

Section: Discussionmentioning

confidence: 99%

Characterization of Engine Control Authority on HCCI Combustion as the High Load Limit is Approached

Szybist

Edwards

Foster

et al. 2013

SAE Int. J. Engines

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In this study the authority of the available engine controls are characterized as the high load limit of homogeneous charge compression ignition (HCCI) combustion is approached. A boosted single-cylinder research engine is used and is equipped with direct injection (DI) fueling, a laboratory air handling system, and a hydraulic valve actuation (HVA) valve train to enable negative valve overlap (NVO) breathing. Results presented include engine loads from 350 to 650 kPa IMEP net and manifold pressure from 98 to 190 kPaa. It is found that in order to increase engine load to 650 kPa IMEP net , it is necessary to increase manifold pressure and external EGR while reducing the NVO duration. While both are effective at controlling combustion phasing, NVO duration is found to be a "coarse" control while fuel injection timing is a "fine" control. NO X emissions are low throughout the study, with emissions below 0.1 g/kW-h at all boosted HCCI conditions, while good combustion efficiency is maintained (>96.5%). Net indicated thermal efficiency increases with load up to 600 kPa IMEP net , where a peak efficiency of 41% is achieved. Parametric investigations reveal that increasing exhaust gas recirculation (EGR) at a constant intake manifold pressure (MAP) and increasing MAP at a constant external EGR rate both retard combustion phasing. It is also found that combustion phasing becomes increasingly sensitive to NVO duration as engine load increases. Finally, comparisons are made between commonly used noise metrics. It is found that compared to the AVL combustion noise meter, ringing intensity (RI) significantly underestimates combustion noise under boosted HCCI conditions. CITATION: Szybist, J., Edwards, K., Foster, M., Confer, K. et al., "Characterization of Engine Control Authority on HCCI Combustion as the High Load Limit is Approached," SAE Int. J. Engines 6(1):2013,

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“…A detailed analysis of the turbocharger requirements is beyond the scope of this paper. For additional information regarding turbocharger matching for HCCI operation, see reference [26].…”

Section: Discussionmentioning

confidence: 99%

Characterization of Engine Control Authority on HCCI Combustion as the High Load Limit is Approached

Szybist

Edwards

Foster

et al. 2013

SAE Int. J. Engines

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“…The second function in equation (11) can be written in the form Table 2. Various types of compressor loss.…”

Section: Euler and Thermodynamics Equationsmentioning

confidence: 99%

A new approach for optimum selection of a turbocharger using a genetic algorithm

Sanaye

Ghadikolaee

Ghasemi

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part D:

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A new method of selecting an optimum turbocharger for a specific engine using thermodynamic and turbomachinery analyses is presented in this paper. The optimum turbocharger was selected for enhancing the power output of the engine by minimizing an objective function (the sum of the compressor losses and the turbine losses). Constraints in the optimization process were used to locate the operating points of the turbocharged engine at the appropriate position on the compressor map (with a sufficiently large distance from the surge line and the choke line) as well as to satisfy a few parameter values. The design parameters in the optimization procedure were the geometric and aerodynamic parameters of the compressor and the turbine. The proposed method was used to specify the geometry of an optimum turbocharger for an engine (the OM 457 LA diesel engine in our case study) or to select a turbocharger from the vendor list. On applying the above procedure for selecting a turbocharger, the compressor efficiency of the selected turbocharger at various engine speeds was between 0.67 and 0.76, the turbine efficiency was between 0.68 and 0.74, and the index for the appropriate distance from the surge line and the choke line on the compressor map was between 0.2 and 0.72.

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“…Moreover, the low exhaust gas enthalpy available to the turbine results in a high exhaust backpressure, leading to increased negative pumping work that affects the fuel economy. 66 Another problem with HCCI is that turbocharging can sometimes increase the rate of the peak pressure rise to an unacceptable levels; so, high EGR fractions or reduced compression ratio may be required to keep the rate of peak pressure rise low. 67,68 Major findings.…”

Section: Combustion Efficiency Enhancement Within the Chambermentioning

confidence: 99%

Novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines: A review

Akehurst

Brace

2015

International Journal of Engine Research

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Engine downsizing, which is the use of a smaller engine that provides the power of a larger engine, is now considered a mega-trend for the internal combustion engine market. It is usually achieved using one or more boosting devices including a supercharger or a turbocharger. Although supercharging is beneficial for engine's transient response, turbocharging technology is more widely adopted considering its advantages in fuel efficiency. Compared to turbocharged compression ignition engines, turbocharged spark-ignition engines tend to be more challenging with respect to the gas exchange process mainly due to their higher pumping loss, the need for throttling and the fact that spark-ignition engines demand more controllability due to the mitigation of knock, particularly with regard to minimizing trapped residuals. These challenges encourage the entire gas exchange process of turbocharged spark-ignition engines to be regarded as a complete air management system instead of just looking at the boosting system in isolation. In addition, more research emphasis should be focused on novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines because the refinement of the conventional technologies cannot provide continuous gains indefinitely and only innovative concept may improve the engine performance to meet the fuel efficiency target and the more stringent emission regulation in the future. This article will first briefly review knowledge of the current state of the art technologies that are in production as opposed to approaches that are currently only being investigated at a research level. Next, more novel methods of the gas exchange process are introduced to identify the improved synergies between the engine and the boosting machine. The major findings to improve the gas exchange process that emerge from this review comprise four aspects (depending on the location where the novel technologies are implemented) which are as follows: charge air pressurization/de-pressurization improvement, combustion efficiency enhancement within the chamber, valve event-associated development and exhaust system optimization. Although the interaction between these technologies on different aspects of the gas exchange process was found to be highly complex, the optimization or the combination of these technologies is anticipated to further improve a downsized turbocharged spark-ignition engine's performance.

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Turbocharger Matching for a 4-Cylinder Gasoline HCCI Engine Using a 1D Engine Simulation

Cited by 10 publications

References 19 publications

Characterization of Engine Control Authority on HCCI Combustion as the High Load Limit is Approached

Characterization of Engine Control Authority on HCCI Combustion as the High Load Limit is Approached

A new approach for optimum selection of a turbocharger using a genetic algorithm

Novel approaches to improve the gas exchange process of downsized turbocharged spark-ignition engines: A review

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