A Sequential Turbocharging Method for Highly-Rated Truck Diesel Engines

Borila, Yurij G.

doi:10.4271/860074

Cited by 21 publications

(9 citation statements)

References 8 publications

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“…However, an important objective of the sequential arrangement is to widen appropriately the flow range for a specific boost pressure. Such turbocharging schemes (with up to four units) have been employed in marine engines, having demonstrated advantages in both the part load performance and transient response (Borila, 1986;Benvenuto and Campora, 2002;Hiereth and Prenninger, 2007;Zhang et al, 2013). Recently, sequential turbocharger configurations (with two units) have been applied to automotive engines too as the one depicted in Figure 6.…”

Section: Sequential 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: Sequential 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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“…Currently e.g. series sequential (Chasse et al, 2008;Galindo, Climent, Guardiola, & Domenech, 2009;Zhang, Deng, Wang, & Zhu, 2008), parallel sequential (Borila, 1988;Thomasson & Eriksson, 2011) systems or a combination of a turbo and a mechanical compressor is in production. Both more stages (Nitta, Minato, & Shimazaki, 2011) as well as the inclusion of electric machines connected to a turbo or a mechanical compressor shaft are being investigated (Eriksson, Lindell, Leufvén, & Thomasson, 2012).…”

Section: Introductionmentioning

confidence: 99%

A surge and choke capable compressor flow model—Validation and extrapolation capability

Leufvén

Eriksson

2013

Control Engineering Practice

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a b s t r a c tIncreasingly stringent emissions legislation combined with consumer performance demand has created the need for complex automotive engines. The control of this complex system relies heavily on control oriented models. Models capable of describing all operating modes of the systems are beneficial, and the models should be easily parametrized and enable extrapolation. A large database of automotive compressor maps is characterized, and used to develop, validate and automatically parametrize a compressor flow model capable of describing reversed flow, normal operation and choke. Measurement data from both an engine test stand and a surge test stand is used to parametrize and validate the surge capability of the model. The model is shown to describe all modes of operation with good performance, and also to be able to extrapolate to small turbo speeds. The extrapolation capability is important, since compressor maps are shown to lack information for low speeds, even though they frequently operate there in an engine installation.

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“…Lately, more than one turbo has been added to increase flexibility. Both series sequential (Chasse et al, 2008;Galindo, Climent, Guardiola, & Domenech, 2009b;Zhang, Deng, Wang, & Zhu, 2008) and parallel sequential Borila (1988) systems have been developed, and even three stage systems (Nitta, Minato, & Shimazaki, 2011) have been evaluated. As turbocharging develops, the demand on the wastegate and bypass valve control strategies increases.…”

Section: Introductionmentioning

confidence: 99%

Modeling and validation of a boost pressure actuation system, for a series sequentially turbocharged SI engine

Thomasson

Leufvén

Criscuolo

et al. 2013

Control Engineering Practice

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a b s t r a c tAn actuation system for flexible control of an advanced turbocharging system is studied. It incorporates a vacuum pump and tank that are connected to pulse width modulation controlled vacuum valves. A methodology for modeling the entire boost pressure actuation system is developed. Emphasis is placed on developing component models that are easily identified from measured data, without the need for expensive measurements.The models have physical interpretations that enable handling of varying surrounding conditions.The component models and integrated system are evaluated on a two stage series sequential turbo system with three actuators having different characteristics.Several applications of the developed system model are presented, including a nonlinear compensator for voltage disturbance rejection where the performance of the compensator is demonstrated on an engine in a test cell. The applicability of the complete system model for control and diagnosis of the vacuum system is also discussed.

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A Sequential Turbocharging Method for Highly-Rated Truck Diesel Engines

Cited by 21 publications

References 8 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 surge and choke capable compressor flow model—Validation and extrapolation capability

Modeling and validation of a boost pressure actuation system, for a series sequentially turbocharged SI engine

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