Abstract
Vehicles with hybrid drive systems, are increasingly more often being equipped with solutions that increase the drive systems efficiency. One of such solutions is to use an increased supply voltage for electric motors of such vehicles. The battery voltage is increased several times in the inverter system in order to increase the electrical power supplied to the electric motor. This article presents possible uses of such voltage amplification (called boost) in urban traffic conditions. The tests used the latest models of vehicles with hybrid drive systems equipped with the same drive units: Lexus NX 300h and Toyota RAV4 Hybrid. The study analyses the conditions of starting such a system and the characteristics of its operation. It has been shown that the amplification of the voltage powering the electrical machinery in both vehicles occurs at high torque values. The maximum voltage amplification–almost threefold (up to 650 V) allows a two-fold increase in the torque of the drive system.
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Abbreviations
- E:
-
energy
- HEV:
-
hybrid-electric vehicle
- I:
-
current
- Li-Ion:
-
lithium-ion battery
- MPG:
-
miles per gallon
- n:
-
speed
- Ni-MH:
-
nickel-metal hydride battery
- Ne:
-
power
- RDC:
-
real driving conditions
- S:
-
distance
- SOC:
-
state of charge
- t:
-
time
- Torq:
-
motor torque
- U:
-
voltage
- Ui:
-
share
- V:
-
vehicle speed
- VH :
-
voltage after boosting
- VL :
-
voltage before boosting
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Pielecha, I., Cieślik, W. & Szałek, A. Operation of hybrid propulsion systems in conditions of increased supply voltage. Int. J. Precis. Eng. Manuf. 18, 1633–1639 (2017). https://doi.org/10.1007/s12541-017-0192-3
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DOI: https://doi.org/10.1007/s12541-017-0192-3