A major cause of CO2 emissions today is fossil fuel vehicles, and lowering these emissions is of key importance, resulting in increasing electrification and hybridisation nowadays. Turbochargers have been used for a long time to recycle exhaust gas heat losses to improve engine performance by compressing the intake air. This thesis investigates a turbocharger with an added electric machine, to see if further energy can be recovered from these gasses, as well as how to control this machine for improved transients during acceleration and reduced turbo lag. A complete Simulink model is created of the system, comprised of a variable geometry turbine, compressor, cylinder, electric motor and battery model. This plant model is then evaluated on test cycles, which results in consistently lowered brake-specific fuel consumption and quicker responses at the cost of electric charge. The results show that an electrically assisted turbocharger poses as a feasible option for further improvements in fuel economy and performance during transients for spark ignited engines.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:liu-187037 |
| Date | January 2022 |
| Creators | Vandor, Erik, Ehlin, Gabriel |
| Publisher | Linköpings universitet, Fordonssystem |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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