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NVH refinement is an important aspect of the powertrain development and vehicle integration process. The depletion of fossil-based fuels and increase in price of gasoline have prompted most vehicle manufacturers to embrace propulsion technologies with varying degrees and types of hybridization.Many different hybrid vehicle systems are either on the market, or under development, even up to all-electric vehicles. Each hybrid vehicle configuration brings unique NVH challenges that result from a variety of sources. This paper begins with an introductory discussion of hybrid propulsion technologies and associated unique vehicle NVH challenges inherent in the operation of such hybrid vehicles. Base: 1700 kg, 150 kW, EU-IV HEV w/ On Board Charging AER: All Electric Range Mild HEV (+ Power Assist + Opt. Operating Strategy) 50 60 70 80 90 100 Otto MPI Diesel Belt Driven Generator (Start/Stop + Recuperation)

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