sentences: "Unlimited EV" and "Battery Dominant Hybrid" as well as "Energy Hybrid" were the given names for the architecture because the term "plug-in" hybrid coined by Dr. Andy Frank was considered at odds with Toyota's position that Prius did not need to be "plugged in" and their opinion that plugging was inconvenient.In 1997 (ten years before Volt) an internal project at the new spin-off, Delphi Corporation, began to convert an EV1 to a PHEV.