To minimize fuel consumption while also minimizing cost requires the development of algorithms to size each component to meet the Vehicle Technical Specifications (VTS) while minimizing the cost. Since each powertrain configuration has specific capabilities, specific algorithms have been developed.
For example, for a Plug-in Hybrid Electric Vehicle operating in blended mode, the peak electric machine mechanical power is defined as the peak power required for the vehicle to follow the Urban Driving Dynamometer Schedule (UDDS) driving cycle. The battery peak discharge power is then defined as the electrical power that the motor requires to produce the peak mechanical power needed for the vehicle to follow the UDDS cycle. The engine is then sized to achieve the gradeability requirement of the vehicle.
The 0–60 performance requirement for the vehicle is satisfied implicitly by the constraints on the peak motor power and the peak engine power. The power required under the conditions of the UDDS cycle with only the motor running and the vehicle driving up a grade with just the engine at a specified vehicle speed exceeds the power requirement imposed on these components based on the need to achieve the desired performance.
Blended PHEV Component Sizing Process
Real World Driving Cycles (RWDC) have also been used to define component requirements (i.e., power and energy) to minimize fuel consumption and component sizes.
Several of the results of Argonne’s studies have been used to generate goals for U.S. DOE programs.
Last update September 2010
Impact of Real-World Drive Cycles on PHEV Battery Requirements (pdf)
Research on PHEV Battery Requirements and Evaluation of Early Prototypes (pdf)