**9. Conclusions**

A simulation study has been conducted to prove that a waste heat recovery method can be employed in a hybrid electric vehicle and offer significant benefits regarding the overall performance of the vehicle, primarily in terms of fuel consumption reduction. An organic Rankine cycle-based waste heat recovery system was chosen as the method by which to extract further work from the conventional elements of this hybrid powertrain. After utilizing this system in the powertrain, the results showed the overall fuel consumption of the vehicle was decreased significantly. In the simulation the engine was run for three different driving cycle tests, including FTP-75, NEDC, and US06, in order to validate the real improved performance of the developed powertrain in different driving conditions, and ultimately led to an efficient driving strategy for the driver of the electric hybrid vehicle that could lower fuel consumption even further.

**Acknowledgments:** This work was not financially supported or funded by any organization/company and the authors would like to acknowledge Marios Kalamakis who performed the simulation procedure.

**Author Contributions:** Amin Mahmoudzadeh Andwari and Vahid Esfahanian have written the paper context and performed results presentation. Apostolos Pesiridis and Apostolos Karvountzis-Kontakiotis have carried out the design of experiment in the simulation and have extracted the data analysis.

**Conflicts of Interest:** The authors declare no conflict of interest.


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