Pressure model based coordinated control of VGT and dual-loop EGR in a diesel engine air-path system

Article

Abstract

This paper describes a pressure-model-based coordinated control method of a variable geometry turbine (VGT) and dual-loop exhaust gas recirculation (EGR) in a diesel engine air-path system. Conventionally, air fraction or burnt gas fraction states are controlled for the control of dual-loop EGR systems, but fraction control is not practical since sensors for fractions are not available on production engines. In fact, there is still great controversy over how best to select control outputs for dual-loop EGR systems. In this paper, pressure and mass flow states are chosen as control outputs without fraction states considering the availability and reliability of sensors. A coordinated controller based on the simple control-oriented model is designed with practical aspects, which is applicable for simultaneous operations of high pressure (HP) EGR, low pressure (LP) EGR, and VGT. In addition, the controller adopts the method of input-output linearization using back-stepping to solve the chronic problems of conventional pressure-based controllers such as coupling effects between operations of HP EGR, and VGT. The control performance is verified by simulation based on the proven GT-POWER model of a heavy-duty 6000cc diesel engine air-path.

Key words

Diesel engine Air-path control Dual-loop EGR Control-oriented model VGT 

Nomenclature

A

effective area (m2)

cp

specific heat at constant pressure (kJ/kg·K)

F

burnt gas fraction (−)

m

mass (kg)

N

engine speed (RPM)

p

pressure (Pa)

P

power (kW)

R

ideal gas constant (kJ/kg·K)

T

temperature (K)

V

volume (m3)

W

mass flow rate (kg/s)

γ

specific heat ratio (−)

η

efficiency (−)

λs

stoichiometric ratio (−)

τtc

turbocharger time constant (s)

Subscripts

a

ambient

c

compressor

i

intake manifold

t

turbine

x

exhaust manifold

dt

downstream of turbine

uc

upstream of compressor

HPegr

high pressure EGR

LPegr

low pressure EGR

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References

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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.School of Mechanical, Aerospace & System EngineeringKAISTDaejeonKorea
  2. 2.Engine Control TeamHyundai AutronGyeonggiKorea

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