Active control turbocharger (ACT) has been proposed as a way to improve turbocharger performance under highly pulsating exhaust flows. This technique implies that the variable geometry mechanism in the turbine is used to optimize its position as a function of the instantaneous mass flow during the engine cycle. Tests presented in the literature showed promising results in a pulsating gas-stand. In this work, a modeling study has been conducted at different engine conditions aimed to quantify the gain in on-engine conditions and to develop a strategy to integrate the ACT system within the engine. Different ways of changing the displacement of the variable mechanism have been analyzed by means of a one-dimensional gas dynamic model. The simulations have been carried out at constant engine operating points defined by fixed air-to-fuel ratio for different mechanism displacement functions around an average position that guarantees the desired amount of intake air. The benefits in overall engine efficiency are lower to those predicted in the literature. It can be concluded that it is not possible to use the ACT system to optimize the turbine operating point and at the same time to control the engine operating point.

References

1.
Filipi
,
Z.
,
Wang
,
Y.
, and
Assanis
,
D.
,
2001
, “
Effect of Variable Geometry Turbine (VGT) on Diesel Engine and Vehicle System Transient Response
,”
SAE
Paper No. 2001-01-1247.10.4271/2001-01-1247
2.
Ghazikhani
,
M.
,
Davarpanaha
,
M.
, and
Mousavi Shaegha
,
S. A.
,
2008
, “
An Experimental Study on the Effects of Different Opening Ranges of Waste-Gate on the Exhaust Soot Emission of a Turbo-Charged DI Diesel Engine
,”
Energy Convers. Manage.
,
49
(
10
), pp.
2563
2569
.10.1016/j.enconman.2008.05.012
3.
Möller
,
C.
,
Johansson
,
P.
,
Grandin
,
B.
, and
Lindstrom
,
F.
,
2005
, “
Divided Exhaust Period, a Gas Exchange System for Turbocharged SI Engines
,” SAE Paper No. 2005-01-1150.
4.
Smith
,
F.
, and
Simpson
,
R.
,
2005
, “
A Camshaft Torque Actuated Vane Style VCT Phaser
,”
SAE
Paper No. 2005-01-0764.10.4271/2005-01-0764
5.
Ferreaua
,
H. J.
,
Ortnerb
,
P.
,
Langthalerb
,
P.
,
del Reb
,
L.
, and
Diehla
,
M.
,
2007
, “
Predictive Control of a Real-World Diesel Engine Using an Extended Online Active Set Strategy
,”
Ann. Rev. Control
,
31
(
2
), pp.
293
301
.10.1016/j.arcontrol.2007.09.001
6.
García-Nieto
,
S.
,
Martínez
,
M.
,
Blasco
,
X.
, and
Sanchis
,
J.
,
2008
, “
Nonlinear Predictive Control Based on Local Model Networks for Air Management in Diesel Engines
,”
Control Eng. Pract.
,
16
(
12
), pp.
1399
1413
.10.1016/j.conengprac.2008.03.010
7.
Pesiridis
,
A.
, and
Martinez-Botas
,
R. F.
,
2007
, “
Experimental Evaluation of Active Flow Control Mixed-Flow Turbine for Automotive Turbocharger Application
,”
ASME J. Turbomach.
,
129
(
1
), pp.
44
53
.10.1115/1.2372778
8.
Roth
,
D. B.
,
Keller
,
P.
, and
Sisson
,
J.
,
2010
, “
Valve-Event Modulated Boost System
,”
SAE
Paper No. 2010-01-1222.10.4271/2010-01-1222
9.
Watson
,
N.
, and
Janota
,
M. S.
,
1982
,
Turbocharging the Internal Combustion Engine
,
Macmillan
,
London
.
10.
Karamanis
,
N.
,
Martinez-Botas
,
R. F.
, and
Su
,
C. C.
,
2001
, “
Mixed Flow Turbines: Inlet and Exit Flow Under Steady and Pulsating Conditions
,”
ASME J. Turbomach.
,
123
(
2
), pp.
359
371
.10.1115/1.1354141
11.
Galindo
,
J.
,
Serrano
,
J. R.
,
Arnau
,
J. R.
, and
Piqueras
,
P.
,
2009
, “
Description of a Semi-Independent Time Discretization Methodology for a One-Dimensional Gas Dynamics Model
,”
ASME J. Eng. Gas Turbines Power
,
131
(
3
), p.
034504
.10.1115/1.2983015
12.
Serrano
,
J. R.
,
Arnau
,
F. J.
,
Dolz
,
V.
,
Tiseira
,
A.
, and
Cervelló
,
C.
,
2008
, “
A Model of Turbocharger Radial Turbines Appropriate to be Used in Zero- and One-Dimensional Gas Dynamics Codes for Internal Combustion Engines Modeling
,”
Energy Convers. Manage.
49
(
12
), pp.
3729
3745
.10.1016/j.enconman.2008.06.031
13.
Galindo
,
J.
,
Climent
,
H.
,
Guardiola
,
C.
, and
Tiseira
,
A.
,
2009
, “
On the Effect of Pulsating Flow on Surge Margin of Small Centrifugal Compressors for Automotive Engines
,”
Exp. Therm. Fluid Sci.
,
33
(
8
), pp.
1163
1171
.10.1016/j.expthermflusci.2009.07.006
14.
Galindo
,
J.
,
Luján
,
J. M.
,
Serrano
,
J. R.
,
Dolz
,
V.
, and
Guilain
,
S.
,
2006
, “
Description of a Heat Transfer Model Suitable to Calculate Transient Processes of Turbocharged Diesel Engines With One-Dimensional Gas-Dynamic Codes
,”
Appl. Therm. Eng.
,
26
(
1
), pp.
66
76
.10.1016/j.applthermaleng.2005.04.010
You do not currently have access to this content.