Optimizing the Transient of an SI-Engine Equipped with Variable Cam Timing and Variable Turbine

Ericsson, Gustav; Ångström, Hans-Erik; Westin, Fredrik

doi:10.4271/2010-01-1233

Cited by 6 publications

(8 citation statements)

References 8 publications

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“…The optimized values for valves angles and waste gate effective diameter are demonstrated versus time in Figs. 11,12,13,14,15,and 16. In these diagrams, the time zero is equal to beginning of the transient or beginning of the throttle opening.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous dynamic optimization of valves timing and waste gate to improve the load step transient response of a turbocharged spark ignition engine

Kakaee

Keshavarz

2017

J Braz. Soc. Mech. Sci. Eng.

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Section: Resultsmentioning

confidence: 99%

“…Turbocharger optimization for fast transient response is studied by Ericson et al [12]. The problem includes simulation in a one-dimensional modeling environment.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous dynamic optimization of valves timing and waste gate to improve the load step transient response of a turbocharged spark ignition engine

Kakaee

Keshavarz

2017

J Braz. Soc. Mech. Sci. Eng.

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“…Ericsson et al 76 have discussed the potential for improving the transient response by using optimised VNT and a variable valve timing (VVT) control strategy. VVT settings (0°, 39° and 78° of valve overlap) were simulated at 1750 r/min starting from an initial IMEP of 3 bar (Figure 17).…”

Section: Control Strategymentioning

confidence: 99%

Section: Control Strategymentioning

confidence: 99%

A review of the application of variable geometry turbines to the downsized gasoline engine

Tang

Pennycott

Akehurst

et al. 2014

International Journal of Engine Research

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Engine downsizing through turbocharging is a proven method of improving fuel economy by using a smaller engine operating at higher levels of specific engine load and higher efficiency. Turbocharging is more challenging for the gasoline engine than the diesel engine due to the higher variability in the flow rate of air and the higher exhaust gas temperature. Although the variable geometry turbine offers the potential for improving the low-end torque, lowering part-load fuel consumption and delivering a fast transient response on a downsized gasoline engine, the cost, durability and the limited allowable turbine inlet temperature on the currently available devices present challenges to widespread application. This article details the main operating principles and types of the variable geometry turbine, its potential to deliver performance improvements, implementation challenges on the gasoline engine and the measures available to alleviate those challenges. Of the available types of variable geometry turbine, the variable nozzle form has the highest efficiency over a wide flow range while the variable flow and sliding wall types have better reliability and lower cost. Using additional technologies such as the water-cooled exhaust manifold, specialist turbocharger materials, exhaust gas recirculation and novel combustion systems in combination with advanced control strategies will facilitate variable geometry turbine application and hence allow further downsizing of the gasoline engine.

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“…It was ramped from 2.3°o pen to 90°in 61 ms. Next, the turbine efficiency multiplier was manually adjusted to give the same turbocharger speed versus time in the simulations. Bodin [12] calibrated the transient model of the GM engine L850 by the experimental results. This calibration was done by the quasisteady method.…”

Section: Introductionmentioning

confidence: 99%

Analysis and dynamic calibration of the transient of an SI-engine equipped with turbocharger

Keshavarz

Kakaee

fajri

2018

J Braz. Soc. Mech. Sci. Eng.

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Transient is considered an important operation mode of an engine since most of its working cycles happen in this mode. In this paper, GT-Power software is used to model the engine and the turbocharger; moreover, the experimental results from the IPCO Company are used for validation and calibration. The simulation is calibrated for the engine's steady state in the part-and full-load conditions. Then, since the transient simulation cannot be performed based on the steady-state settings, the engine transient simulation is calibrated. Upon the performed simulation, the calibration differences of the transient and the steady state are investigated. These differences are analyzed during four processes of combustion, injection, heat transfer in the exhaust manifold and the turbocharger performance; then the various parameters' effect on the engine transient are studied. The considered transient is the one during which the engine load increases with the throttle opening at a constant engine speed. It is concluded that the produced maps of the combustion and injection parameters, which are achieved from the quasi-steady conditions, can properly predict these parameters' behavior. However, the turbocharger performance and the heat transfer inside the exhaust manifold must be calibrated, transiently. With this procedure for model calibration, the error between the model and the experimental results were decreased significantly. For example, in the speed of 1900 rpm, the error between the model and the experimental data for transient simulation is reduced from 1.57 to 0.18%. The studied engine is 1.65 L EF7-TC which is a spark ignition engine equipped with a turbocharger.

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Optimizing the Transient of an SI-Engine Equipped with Variable Cam Timing and Variable Turbine

Cited by 6 publications

References 8 publications

Simultaneous dynamic optimization of valves timing and waste gate to improve the load step transient response of a turbocharged spark ignition engine

Simultaneous dynamic optimization of valves timing and waste gate to improve the load step transient response of a turbocharged spark ignition engine

A review of the application of variable geometry turbines to the downsized gasoline engine

Analysis and dynamic calibration of the transient of an SI-engine equipped with turbocharger

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