Matching and Evaluating Methods for Euro 6 and Efficient Two-stage Turbocharging Diesel Engine

Watel, E.; Pagot, Alexandre; Pacaud, P.; Schmitt, Jean-Christophe

doi:10.4271/2010-01-1229

Cited by 25 publications

(9 citation statements)

References 7 publications

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“…For example, the HP unit might be by-passed at high speeds and loads to avoid overboosting (Hiereth and Prenninger, 2007;Canova et al, 2009;Zhang et al, 2013). The second is the matching between engine and turbochargers, which is obviously a more difficult task compared to single-stage units, as the second turbocharger induces one more degree of complexity (Watel et al, 2010). In particular, the size ratio between the two units is of critical importance for both steady-state and transient operations.…”

Section: Two-stage Turbochargingmentioning

confidence: 99%

Review of Some Methods for Improving Transient Response in Automotive Diesel Engines through Various Turbocharging Configurations

Giakoumis

2016

Front. Mech. Eng.

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Turbocharged diesel engines suffer from worse transient performance than their naturally aspirated counterparts, mostly at low loads and speeds. This leads to overshoot in engine-out exhaust emissions (primarily particulate matter/soot and NOx) after a speed or load increase, as well as poor drivability. The main cause for this problematic behavior is located in the turbocharger in the form of high moment of inertia and unfavorable aerodynamic-type compressor flow characteristics. In the present work, various alternative turbocharging configurations are reviewed that have proven successful in improving the dynamic diesel engine operation. These configurations are combined supercharging, variable-geometry turbine, electrically assisted turbocharging, two-stage series and sequential turbocharging, and lower turbine moment of inertia. Significant improvement in the engine's transient response can be realized when designing for smaller turbocharger frames or applying more than one units (in series or parallel arrangement). Increasing the available turbine torque (e.g., through elevated turbine back pressure in a variable-geometry turbine) is another successful option, as well as enhancement of the boost pressure (e.g., through the use of a positive displacement compressor upstream of the turbocharger). Finally, the use of external energy (e.g., in the form of electrical assistance on the turbocharger shaft during the critical turbocharger-lag phase) is another recently developed and highly promising measure to mitigate the drawbacks of the poor transient performance of turbocharged diesel-engined vehicles and limit their exhaust emissions. The choice of the "best" configuration for a specific application depends on many parameters, such as cost, matching procedure, control system, and mainly type of engine and drive cycle of the vehicle.

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Section: Two-stage Turbochargingmentioning

confidence: 99%

Review of Some Methods for Improving Transient Response in Automotive Diesel Engines through Various Turbocharging Configurations

Giakoumis

2016

Front. Mech. Eng.

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“…The high EGR at full load is therefore an important route to meeting EURO5 emission standards. 23,26 Watel et al 28 focused on using series turbocharging technology in order to reduce NO x emissions. Simulation points were chosen according to the New European Driving Cycle, and the turbocharger matching was performed solely with emissions reduction in mind.…”

Section: Series Arrangementmentioning

confidence: 99%

A review of parallel and series turbocharging for the diesel engine

Zhang

Pennycott

Brace

2013

Proceedings of the Institution of Mechanical Engineers, Part D:

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Several turbocharger units can be used for engine boosting in series or parallel arrangements in which they are phased in and out according to the operating conditions of the engine. This technology has the potential to facilitate downsizing of automotive engines in order to yield benefits in terms of their transient performance, the fuel consumption and emissions output. This review investigates the benefits and drawbacks of series and parallel turbocharging arrangements. Since the effectiveness of using the boosting technology crucially depends on the control scheme applied, developments in the modelling and control approaches used in single-stage, series and parallel turbocharging are also examined. In comparison with single-stage turbocharging, using several turbochargers in series or parallel can provide a faster transient response without compromising the fuel consumption, while also having the potential to provide higher boost pressures. Novel non-linear and robust control approaches have demonstrated improvements in performance and robustness over traditional approaches used in commercial engine control relying on separate control loops for the different engine variables.

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“…Policies of pollutant, such as NOx, fuel consumption and noise have influenced its development. The system is an important piece for the new generation of engines that must comply with the EURO6 European standard in force from 2015 [3].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of a 1-D tool to study transient thermal in turbocharger bearing housing

Serrano

Tiseira

Usaquén

2018

Applied Thermal Engineering

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The heat transfer model can be used in a one-dimensional (1-D) engine simulation. When the engine speed is reduced to zero, the codes have been upgraded to calculate transient turbocharger thermal conditions. The turbocharger model has been used as an external plugin. Analysis of the temperature evolution at different parts of the turbocharger is done by using a hot spot engine cycle. A turbocharger bypassing strategy is done by means of a 9 bypass valve system. By using this method, instabilities can be found in the binary onoff state of an engine. Highlights  Thermal sensitivity is measured in the turbocharger in regards to a onedimensional engine.  A visual aid, such as a model, can help depict the evolution of thermal theory.  The behaviour of a turbocharger in a hot stop is affected by such diverse cooling strategies.  A coke phenomenon in the lubricating circuit affects turbocharger efficiency and durability.  High temperatures that occur within a turbocharger produce problems such as clogged bearing systems and damaged shafts.

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Matching and Evaluating Methods for Euro 6 and Efficient Two-stage Turbocharging Diesel Engine

Cited by 25 publications

References 7 publications

Review of Some Methods for Improving Transient Response in Automotive Diesel Engines through Various Turbocharging Configurations

Review of Some Methods for Improving Transient Response in Automotive Diesel Engines through Various Turbocharging Configurations

A review of parallel and series turbocharging for the diesel engine

Adaptation of a 1-D tool to study transient thermal in turbocharger bearing housing

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