A Parallel Hybrid Traction System for GM's “Precept” PNGV Vehicle

General Motors has developed a unique hybrid electric concept vehicle to satisfy requirements of the Partnership for a New Generation of Vehicles (PNGV) program. The Precept vehicle features a fundamental architecture that is unconventional compared to contemporary passenger car design, or even to other hybrid vehicles. This paper describes a unique parallel hybrid traction system used to achieve the requirements of the PNGV program and its development.