Plug in Series Hybrid System Traction Motor Traction motor Electric Motor Power Converter Generator I.C. Engine Battery Storage Charger Drive Power Electric Power Fig 1. Schematic of plug-in series HEV Fig. 2 Prius series/parallel hybrid system Fig. 3 This project - series hybrid system based on modifying Prius

Generator Design Update Lower power (1kW) prototype machine has been fully constructed. Package is less than 6” in diameter Back-EMF waveforms are sinusoidal and indicate a machine constant of 0.31 V/(rad/s). Innovative drive is necessary to get high stand-still torque AND high speed operation.

Generator Design Update Performance of 1kW prototype machine: (a) (b) (a) Torque (blue) curve as speed increases and (b) close up of the current waveform (pink) Operation of the prototype has been verified, so design of the 8kW starter-alternator has commenced

Energy Storage Simulation Initialization Parameters of Li-Polymer and NiMH batteries Relevant Vehicle Parameters Battery Specific Energy (Wh/kg) Useable SOC ηd ηc Lithium Polymer 143 ~70% 95% NiMH 46 ~40% 84% Mass mv (lb) Wheel dia. (inch) fr CD Af (m2) 2890 15 0.008 0.26 2.16 Test Data Driving speed schedule of vehicle The test route around the city of Lincoln, NE Changeable altitude of test road

Energy Simulation Results Battery requirement for a 15 miles range Battery Type Useable energy (kWh) Capacity Weight (kg) NiMH 3.07 7.68 167 Li-Polymer 2.54 3.63 26 Battery transfer energy during drive Battery SOC with changeable altitude and constant altitude Li-Polymer battery output power Conclusion: 1.High energy efficiency can reduce battery energy losses 2.Maximize ΔSOC can dramatically reduce the total battery capacity requirement 3.The potential energy change with altitude can’t be ignored in design