This book is a comprehensive description of the unique hybrid technology, and is based on independent research . The purpose of the book is to stimulate curiosity and develope awareness of hybrid vehicle systems, beyond what appears in the book. Writing style is not a narrative text, and directed to review factual, concise for rapid absorption, and includes technical guidelines for understanding the hybrid technologies. The book details the principles and mechanisms of hybrid systems and principles of operation of the hybrid vehicle control systems . This book is intended primarily for interested readers, or those with a professional background. The book assumes that the reader have prior knowledge about conventional vehicle, which is an advantage in understanding the material faster.