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Rose-Hulman Institute of Technology is designing a power-split hybrid-electric vehicle that uses three power sources: a 70 kW Diesel engine that uses B-20 Diesel fuel and two 60 kW induction electric machines. All three power sources are connected through a planetary gear set (PGS). The electric machines move the vehicle in forward or reverse, act as motors or generators, and one of the motors is required to control the speed of the engine. When the three power sources are combined with a battery that must be maintained within specific operating limits, the system becomes a challenging control problem. This paper discusses the simulation methods used to design and verify the operation of the supervisory controller that controls all aspects of vehicle operation.