Decision on prognosis approaches of Hybrid Electric Vehicles' electrical machines

Hybrid Electric Vehicles (HEV) are becoming widely spread due to the predicted lack of fuel in addition to the pollution caused by the conventional vehicles. To overcome pollution and since it is expected that the lack of fuel will more increase, it is assessed that the production and use of HEVs will increase in the coming years. The main concern of HEVs is their reliability and availability; hence, assuring the health and proper operation of HEVs is a mission. Due to the importance of electrical machines health state in HEVs, this paper will present a survey on the available prognostic techniques that may be applied to assure an optimal and convenient operation of electrical machines in hybrid electric vehicle.