Improving electric vehicle energy efficiency with two-speed gearbox

Heikki Laitinen, Antti Lajunen, Kari Tammi

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

5 Citations (Scopus)


This study investigated the possibility to increase electric vehicle’s energy efficiency with a two-speed gearbox. The evaluation was based on simulations on a midsize electric vehicle model. Simulations were carried out in different driving cycles and optimal gearbox parameters were determined for each driving cycle. In Case 1) efficiency maps were used for the motor and inverter. In Case 2) the inverter efficiency was assumed constant and efficiency map was used only for the electric motor. The energy saving potential in different cycles was determined. The simulation results showed that a two-speed gearbox could improve energy efficiency. The improvement depends on the driving cycle and electric drive characteristics.
Original languageEnglish
Title of host publication14th IEEE Vehicle Power and Propulsion Conference, VPPC 2017
Number of pages5
ISBN (Electronic)978-1-5386-1317-7
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventIEEE Vehicle Power and Propulsion Conference - Belfort, France
Duration: 11 Dec 201714 Dec 2017
Conference number: 14


ConferenceIEEE Vehicle Power and Propulsion Conference
Abbreviated titleVPPC
Internet address


  • electric vehicle
  • two-speed gearbox
  • efficiency map

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