Dr. Hartavi Karci is an Associate Professor in the Center of the Automotive Engineering. Her current research interests are connected autonomous vehicle trajectory planner and controller, advanced driver assistance systems, electric/hybrid electric vehicles technology, modelling, and control methodology, active magnetic bearings and their applications. She is the author of over 40 publications and inventor of the 3 patents in the fields of electric vehicles. She is the Scientific Coordinator of the H2020 TRUSTVEHICLE project and the PI/co-PI of the HADRIAN, OWHEEL, OBELICS, SYS2WHEEL, ADVICE, EVE-RISE, TELL and EVC1000 projects. She recently received the awards for the Mercedes AMG: Best High Voltage Powertrain for Electrics Vehicles, and the IMechE: Most Efficient Electric car globally and Best UK Electric Car 2019 Awards.
In the media
- Electric and Hybrid Vehicle Technology, Modeling, Design and Control
- Connected Autonomous Vehicles
- Intelligent Ground Vehicles
- Software Safety
- Electrical Machines
- Active Magnetic Bearing Systems and Applications
Transmissions and Automated Manual Transmissions,Energies 10 (10) 1562 pp. 1-22 MDPI
than automatic transmission systems with torque converters; and (ii) the capability to fill the torque
gap during gear shifts to allow seamless longitudinal acceleration profiles. Therefore, DCTs are viable
alternatives to automated manual transmissions (AMTs). For vehicles equipped with engines that
can generate considerable torque, large clutch-slip energy losses occur during power-on gear shifts
and, as a result, DCTs need wet clutches for effective heat dissipation. This requirement substantially
reduces DCT efficiency because of the churning and ancillary power dissipations associated with
the wet clutch pack. To the knowledge of the authors, this study is the first to analyse the detailed
power loss contributions of a DCT with wet clutches, and their relative significance along a set of
driving cycles. Based on these results, a novel hybridised AMT (HAMT) with a single dry clutch
and an electric motor is proposed for the same vehicle. The HAMT architecture combines the high
mechanical efficiency typical of AMTs with a single dry clutch, with the torque-fill capability and
operational flexibility allowed by the electric motor. The measured efficiency maps of a case study
DCT and HAMT are compared. This is then complemented by the analysis of the respective fuel
consumption along the driving cycles, which is simulated with an experimentally validated vehicle
model. In its internal combustion engine mode, the HAMT reduces fuel consumption by >9% with
respect to the DCT.
The research of this thesis focuses on the hardware-in-the-loop (HIL) assessment of proof-of-concept automotive systems. Two main applications are investigated: i) hybridised drivetrains; and ii) novel wheel slip controllers for anti-lock braking systems (ABS) applications.
The activities related to the assessment of proof-of-concept transmissions involve preliminary simulations and experimental evaluation of novel transmission prototypes for high performance passenger cars. A model-based approach is used to analyse the main power loss contributions of a baseline case study transmission. The newly developed hybridised transmission offers comparable performance (i.e. smooth acceleration profile during gearshift events), addressing comfort requirements. The experimental activity showed the efficiency improvements due to the mechanical layout of the new hybridised transmission. The benefits deriving by the hybridisation are also assessed through simulations carried out considering alternative proof-of-concept transmission layouts and an on-line implementable energy management strategy (A-ECMS). Other examples of hybridization layouts are also reported, i.e., the very recently developed hybrid rear axle module (HRAM). Furthermore, because of its ?modular? nature, the device can be equipped with advanced mechanical systems which allow a left-to-right torque distribution.
The wheel slip controller assessment on a HIL test rig setup involves an electro-hydraulic braking (EHB) unit. Because of their decoupled nature, EHBs offer independent and continuous modulation of the pressure levels at the four corners of the vehicle. For this test case, the HIL methodology is employed to quantify the performance benefits deriving from a PID-based wheel slip controller and a more advanced control strategy such as an explicit non-linear model predictive controller (eNMPC). The eNMPC performs better with respect the PID-based wheel slip controller on different test case scenarios. The results obtained during the development process have proven the effectiveness of the presented devices.
years and decades. However, EVs still present significant practical limitations in terms of mileage. Hence,
the automotive industry is making important research efforts towards the progressive increase of battery
energy density, reduction of battery charging time, and enhancement of electric powertrain efficiency. The
electric machine is the main power loss contributor of an electric powertrain. This literature survey reviews
the design and control methods to improve the energy efficiency of electric machines for EVs. The motor
design requirements and specifications are described in terms of power density, efficiency along driving
cycles, and cost, according to the targets set by the roadmaps of the main governmental agencies. The review
discusses the stator and rotor design parameters, winding configurations, novel materials, construction
technologies as well as control methods that are most influential on the power loss characteristics of typical
traction machines. Moreover, the paper covers: i) driving cycle based design methods of traction motors,
for energy consumption reduction in real operating conditions; and ii) novel machine topologies providing
potential efficiency benefits.
Hartavi, A.E., Shah Alias Sangani, A., Kabbani, T., Sarhadi, P., Zohan, J., Kasıkcı, K., Maroun, S., Salem, M., Shanmugam, S., Krishna, A., Ou, J., Sozen, E., Aydemir, E. and Ahiad, S., n.d. Enhanced Trustworthiness and End User Acceptance of Conditionally Automated Vehicles in the Transition Period, Chapter 4: Reliable Sense-Plan-Act Approaches For Autonomous Vehicles. ISBN 978-3-030-60860-6, 1st ed. Springer, 2020. DOI: 10.1007/978-3-030-60861-3
Schiker, L., Watzeing, D., Hartavi, A. E. and Troglia, M. Enhanced Trustworthiness and End User Acceptance of Conditionally Automated Vehicles in the Transition Period, Chapter 1: Trustworthiness, User Acceptance And Expectations. ISBN 978-3-030-60860-6, 1st ed. Springer, 2020. DOI: 10.1007/978-3-030-60861-3
Hillbrand, B., Innerwinkler, P., Stettinger, G., Hartavi, A.E., Rodopl, K., Buyukakin, T., Sözen, E., Aydemir, E., Clement, P., Zaya, J., Sahimäki, S. and Tarkiainen, M. Enhanced Trustworthiness and End User Acceptance of Conditionally Automated Vehicles in the Transition Period, Chapter 5: Trustvehicle Verification Procedure. ISBN 978-3-030-60860-6, 1st ed. Springer, 2020. DOI: 10.1007/978-3-030-60861-3
Philipp, C., Hartavi, A.E., Bernhard, H., Philipp, Q., Herbert, D. and Kasikci, K., n.d. Enhanced Trustworthiness and End User Acceptance of Conditionally Automated Vehicles in the Transition Period, Chapter 6: Assessment Concept for Trust(ed)Vehicle(S). ISBN 978-3-030-60860-6, 1st ed. Springer, 2020. DOI: 10.1007/978-3-030-60861-3
Advancements in Steering Systems, Braking Systems, and Advanced Chassis Control and Rollover Stability, Chapter 7: Electric Regenerative Power Assisted Brake Algorithm for a Front and Rear Wheel Drive Parallel Hybrid Electric Commercial Van, ISBN: 978-0-7680-2092-2, SAE International, 2008.
Simulation of Commercial Vehicles 2008, Chapter 7: Maximizing Overall Efficiency Strategy for Power Split Control of a Parallel Hybrid Electric Vehicle, ISBN: 978-0-7680-2094-6, SAE International, 2008.
Shao, Lingyun & Hartavi, Ahu Ece & Tavernini, Davide & Sorniotti, Aldo & Cheng, Ming. (2020). Design Approaches and Control Strategies for Energy-Efficient Electric Machines for Electric Vehicles – A Review. IEEE Access. PP. 1-1. 10.1109/ACCESS.2020.2993235.
Tavernini, Davide & Vacca, Fabio & Metzler, Mathias & Savitski, Dzmitry & Ivanov, Valentin & Gruber, Patrick & Hartavi, Ahu Ece & Dhaens, Miguel & Sorniotti, Aldo. (2019). An explicit nonlinear model predictive ABS controller for electro-hydraulic braking systems. IEEE Transactions on Industrial Electronics. PP. 1-1. 10.1109/TIE.2019.2916387.
Güvenc L, Uygan I.M.C., Kahraman K., Karaahmetoğlu R., Senturk M., Hartavi A.E., Emirler T. M., Altay I., Altug E., Turan M. C., Tas O. S., Bozkurt E., Ozguner U., (2012)“Cooperative Adaptive Cruise Control Implementation of Team Mekar at the Grand Cooperative Driving Challenge”, Special Issue of the IEEE Transactions on Intelligent Transportation Systems.
Hartavi A.E., Uygan I.M.C., Sezer V., Acarman T., Güvenc L. (2010), “Propulsion System Design of a Hybrid Electric Vehicle”, International Journal on Vehicle Design.
Sahinkaya M. N, Hartavi A.E. (2007), “Variable Bias Current in Magnetic Bearings for Energy Optimization”, IEEE Transactions on Magnetics.
Shah Alias Sangani, A., Hartavi, A.E. Commercial Viability Assessment of Safety-Critical Embedded Software of Electrified Road Vehicles via detailed-COCOMO Approach. SAE Technical Paper, 2021
Rini, G., Bernardis, M. D., Shah Alias Sangani, A., Sorniotti, A., Hartavi, A.E., Nonlinear model predictive torque-vectoring control for a commercial electric vehicle. SAE Technical Paper, 2021
Kabbani, T., Sarhadi, P., Sozen, E., Kinavb, E., Hartavi, A.E., Level 3 Autonomous Fully Reverse-Parking System for a Heavy-Duty Vehicle. ITS European Congress, 2021
Hartavi A. E, Gol M., Akyuz B.,“A Comparative Study of Different Electric Drive Systems and Their Effects on Drive Cycle Performance of an Electric City Bus”, EVS28, May 3-6, 2015, Kintex, Korea.
Gol M., Inal T. T., Hartavi A. E, “An Effectıve Tool for Evaluating the Impact of E-powertrain on Energy Consumption and Performance, Otomotiv Teknolojileri Kongresi, May 26-27, 2014, Bursa, Turkey.
Inal T. T., Ustoglu I., Hartavi A. E, “Energy Benefit Analysis of Centre and Wheel-Hub Drives for Electric Vehicles” Automotive Technologies Conference, 2013, Istanbul, Turkey
Turan M. C., Hartavi A.E., Altug E., “Development of Rule Based Upper Level Control Algorithm for an Intelligent Vehicle in Automated Highway System” 2012 IEEE International Conference on Vehicular Electronics and Safety, July 24-27, 2012, Istanbul, Turkey.
Hartavi A.E., Uygan I.M.C., Turan M. C., Karaahmetoğlu R., Senturk M., Tas O. S., Kahraman K., Güvenc L, Guvenc B.A, Ozguner U., Altug E., Efendioglu B., “Design and Control Basics of a Cooperative Vehicle”, Otomotiv Teknolojileri Kongresi, June 4-5, 2012, Bursa, Turkey.
Hartavi A.E., Uygan I.M.C., Güvenc L, “Bypass Based Rapid Control Prototyping of Hybrid Brake Control System” Otomotiv Teknolojileri Kongresi, June 7-8, 2010, Bursa, Turkey.
Hartavi A.E. , Sahinkaya M. N, Tunçay R. N., “ The Effect of Current Control Strategies on Power Consumption of Magnetically Levitated Turbomolecular Pump”, International Power Electronics and Motion Control Conference, August 13-16, 2006, China.
Sahinkaya M. N, Hartavi A. E., Burrows C. R. and Tunçay R. N., “Bias Current Optimization and Fuzzy Controller for Magnetic Bearings In Turbomoleculer Pumps”, Proceedings of The Ninth International Symposium on Magnetic Bearings, 2004, Lexington, USA.