RESEARCH PAPER
Operation of electric hybrid drive systems in varied driving conditions
1
Institute of Combustion Engines and Transport Poznan University of Technology ul. Piotrowo 3, 60-965 Poznań, Poland
2
Toyota Motor Poland ul. Konstruktorska 5, 02-673 Warszawa, Poland
Publication date: 2018-03-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2018;20(1):16-23
KEYWORDS
ABSTRACT
Hybrid vehicles allow an increase in the powertrain efficiency thanks to their design. One such factor is the use of increased voltage supplying electric motors to the voltage supplying the high voltage battery. The battery voltage is increased several times in
the inverter (boost) system to increase the final electric power supplied to the electric motor. The article presents the possibilities
of using such a voltage boost in urban and non-urban driving conditions. The tests were performed on the latest generations of
parallel hybrid drive systems in Lexus NX 300h and Toyota RAV4 hybrid vehicles. It has been shown that the boost system is used
in about 30–40% of the urban drive distance (up to 20% of the driving time). The power supply voltage boost of the electric motors
of both vehicles is used throughout the entire engine speed range of these machines at high torque values. Research has shown that
the maximum voltage gain – approximately three times (up to 650 V) – is within the maximum torque range of the electric motors
and allows for doubling the torque generated by the drive.
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| eISSN: | 2956-3860 |
| ISSN: | 1507-2711 |
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