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Delphi and the National Renewable Energy Laboratory (NREL) collaborated to develop a simulation code to model the mechanical and electrical architectures of a series hybrid vehicle simultaneously. This co-simulation code is part of the larger ADVISOR® product created by NREL and diverse partners. Simulation of the macro power flow in a series hybrid vehicle requires both the mechanical drivetrain and the entire electrical architecture. It is desirable to solve the electrical network equations in an environment designed to comprehend such a network and solve the equations in terms of current and voltage. The electrical architecture for the series hybrid vehicle has been modeled in Saber™ to achieve these goals. This electrical architecture includes not only the high-voltage battery, generator, and traction motor, but also the normal low-voltage bus (14V) with loads common to all vehicles.

North American sales of light duty trucks, including sport utility vehicles (SUV's), have now passed the 50% mark of total vehicles sold. This fact, along with the recent surge in gas prices, has drawn attention to the lower average fuel economy of this vehicle class. With possible changes to the light duty truck corporate average fuel economy (CAFE) standards looming on the horizon, vehicle manufacturers are looking for ways to improve the fuel economy of these vehicles without affecting performance or utility. One possible solution in accomplishing this objective is the 42 volt integrated starter-generator (ISG). The ISG offers the ability to reduce fuel consumption through the use of engine-off during coast-down and idle, early torque converter lockup with torque smoothing, regenerative braking, and electrical launch assist. It also boosts the onboard power generation and energy storage, allowing for increased vehicle electrical loads.