Utilize 48V system to gain CO2, safety & improved UX

Att kvantifiera potentiell CO2 besparing medelst ett lågkostnads mildhybridsystem baserat på 48V som systemspänning. - Reducera bränsleförbrukning med 8-10g CO2/km i genomsnitt per bil - Möta kommande lagkrav på flottförbrukning som kommer träda i kraft från 2020 och 2025 - Studera hur vi kan utnyttja 48V systemspänning för att sänka bränsleförbrukning, förbättra aktiv säkerhet och förbättra kundtillfredställelse. - Skapa kärn-kompetens för tillämpad forskning inom 48V elkraft arkitektur mellan akademien och industri

Partner organizations

  • Volvo Cars (Private, Sweden)
Start date 01/04/2014
End date The project is closed: 31/12/2017

Introducing a new 48 V power system in personal vehicles opens up for new possibilities. By using a low-voltage electric machine with power up to 15 kW, a mild hybrid electric powertrain can be achieved with components that are smaller and cheaper than other large full hybrids. The potential in reduction of both fuel consumption and greenhouse gas emissions is expected to reach 10 % for certain drive cycles with this topology. 

With the help of a 48 V advanced battery (e.g. li-ion) and a DC/DC converter, many large electric loads can move from the old 12 V system to the new 48 V bus, enabling higher system efficiency and thus requiring less fossil fuel to perform the same job. New, larger electrical loads can also be supported. The 48 V electric machine can perform load shifting, some brake regeneration and torque boost, enhancing the vehicle performance.

The electromagnetical and thermal design of the 48 V electric machine is the core of this research project. Vehicle models are used to evaluate different powertrain topologies in drive cycles such as NEDC and WLTC.

This project is funded by Vinnova FFI in cooperation between Chalmers Electric Power Engineering and Volvo Car Group.

Funded by

  • VINNOVA (Public, Sweden)

Published: Thu 31 May 2018.