Secondary energy most often originates from primary source or sometimes comes from an external system (Badin F., Briat O., Olivier S., Jeanneret B., Trugue R., Malaquin B., October 2004).
Hybrid vehicles are not a modern invention. Hybrid technology has been in use since the 20th century. The first diesel motor ship, which is also called the first diesel electric ship, was launched in 1903, and Russian Tanker Vandal had been using hybrid technology since then. Another modern example of hybrid ship propulsion is electric motors mounted in pods, called azimuth thrusters, which allow for 360o rotation of thrust. There are also diesel-electric trains developed in 1920’s, used for moving trains around railway yards. These hybrid vehicles get significant importance due to simplification of power transmission as well as usage of multiple motors and electricity that reduce maintenance cost.
Convention Cars: A traditional or conventional car, unlike a hybrid car, lacks an electrical motor to assist engine to make power during crisis time. Convention cars have just one source of energy and there is no second source. Because there is no assistance of an electrical motor in convention cars, hybrid cars are more fuel efficient and produce fewer emissions.
Hybrid Cars: Hybrid car is the most common application of hybrid technology. The first introduced hybrid motor vehicle was a bicycle equipped with helper motors. These were known as mopeds. VeloSoleX is an example of mopeds. An example of the most modern application is the human electric hybrid vehicles which consist of a drive train i.e. a human being, generator or an electric motor, and an energy accumulator or battery. It has the same characteristics of a hybrid bicycle with enhanced acceleration and innovation of regenerative braking.
An example of hybrid vehicle is “TWIKE” which was designed to carry cargo and two passengers. It can be driven either in electric mode or electric and