The overall fuel efficiency is affected by the component technologies from a component sizing and efficiency aspect. To properly define the component requirements, several technologies for each of the main components (energy storage, engine and electric machines) are being compared using Autonomie.
Several Li-ion battery materials are being modeled to meet the PHEV R&D plan to evaluate their impact on fuel efficiency and vehicle mass. Different Power to Energy ratios are considered to understand the relative impact of power and energy.
Regarding engine technology, several options are also being considered. We are studying both the impact of using a simpler, cheaper engine as well as the latest technology engine. The impact of different fuels (gasoline, diesel, E85, hydrogen) on the entire life cycle is also being assessed using GREET.
The impact of lightweight materials on fuel economy and demands on the vehicle powertrain and ancillary systems is also being assessed.
Last update September 2010
Impact of Component Technology on PHEV Fuel Efficiency (pdf)
Impact of Battery Characteristics on PHEV Fuel Economy (pdf)