MIMO Control of a Turbogenerator for Energy Recovery 2020.pdf (843.97 kB)
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MIMO control of a turbogenerator for energy recovery

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journal contribution
posted on 04.03.2021, 09:30 by Simon PetrovichSimon Petrovich, Kambiz EbrahimiKambiz Ebrahimi, Nikolaos Kalantzis, Antonios PezouvanisAntonios Pezouvanis
Market trends for increased engine power and more electrical energy on the powergrid (3kW+), along with customer demands for fuel consumption improvements and emissions reduction, are driving requirements for component electrification, including turbochargers. GTDI engines waste significant exhaust enthalpy; even at moderate loads the WG (Wastegate) starts to open to regulate the turbine power. This action is required to reduce EBP (Exhaust Back Pressure). Another factor is catalyst protection, where the emissions device is placed downstream turbine. Lambda enrichment or over-fueling is used to perform this. However, the turbine has a temperature drop across it when used for energy recovery. Since catalyst performance is critical for emissions, the only reasonable location for an additional device is downstream of it. This is a challenge for any additional energy recovery, but a smaller turbine is a design requirement, optimized to operate at lower pressure ratios. A WAVE model of the 2.0L GTDI engine was adapted to include a TG (Turbogenerator) and TBV (Turbine Bypass Valve) with the TG in a mechanical turbocompounding configuration, calibrated with steady state dynamometer data. This includes power and fuel consumption, and additionally a sensitivity analysis and knock impact assessment. Further work includes transient verification with WAVE-RT on WLTP and RDE drive cycles, estimating dynamic energy recovery, assessing electrical turbocompounding, interfacing to the powergrid, and calibration optimisation, using combined WG and TBV settings. Development of more advanced MIMO (Multiple-Input, Multiple-Output) control system algorithms and prototype testing on dynamometer or vehicle could be performed to verify design assumptions and simulation results.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

SAE Technical Papers

Publisher

SAE International

Version

AM (Accepted Manuscript)

Rights holder

© SAE International

Publisher statement

This paper was accepted for publication in SAE Technical Papers and the definitive published version is available at https://doi.org/10.4271/2020-01-0261.

Acceptance date

03/02/2020

Publication date

2020-04-14

Copyright date

2020

ISSN

0148-7191

eISSN

2688-3627

Language

en

Depositor

Mr Simon Petrovich. Deposit date: 2 March 2021

Article number

2020-01-0261

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