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The demand for higher efficiency from the automobile vehicle and their associated accessories has increased in last few years due to the continuous increase in fuel price, increased pollution rate due to emission from vehicle. It is common practice to use high grade fuel, efficient transmission system, braking system, aero foil design and modified engine design to increase efficiency, life of vehicle and decrease pollution rate. In the last few years, due to updating the technology economy of vehicle has raised.

For hybrid vehicle and locomotives regenerative braking system technology is considered to be one of the most advanced technologies which expected to have good contribution into automobile and environment improvements. Hybrid vehicle and locomotives have efficient transmission, higher mechanical efficiency etc. by using the different advanced technologies like regenerative braking system.

Generally in automobiles whenever the brakes are applied the vehicle comes to the rest and the kinetic energy gets wasted due to friction due to braking. Using regenerative braking system in automobiles it enables us to recover the kinetic energy of the vehicle to some extent that is lost during braking.

This technology of regenerative braking controls the speed of the vehicle by converting the portion of the vehicle’s kinetic energy into another useful form of energy. The energy produced could be stored as electrical energy in the automobile battery or as mechanical energy in flywheels, which can be again used by the vehicle.

Regenerative braking is one of the emerging technologies which can prove very beneficial. The use of regenerative braking system in a vehicle not only results in the recovery of the energy but it also increases the efficiency of the vehicle and save energy which is stored in battery.

Regenerative braking system has wide scope for further development and energy savings. The use of more efficient systems could lead to huge saving in the economy of any country.

In the automobile vehicle many accessories and mountings, such as braking system, power transmission system, radiator, gear box, engine components, tires, flywheel etc. are used. Parts like braking system, engine components and transmission system in which heat loss occurs. To increase

overall efficiency of the vehicle heat loss must be reduced and this can be achieved by different techniques. Regenerative braking is one of them which reduce heat loss in braking and recover the kinetic energy of the vehicle.
Generally, in most of the cars, conventional friction brakes are used to stop or control the speed of cars while it is in motion. During the running condition, the car having lots of kinetic energy, when the brake is applied, this kinetic energy is losses by heat energy due to the friction between the brake shoe and brake plate. Thus this extra power loss reduces the overall efficiency of the vehicle. This type of heat losses of energy can be limit by use of regenerative breaking system known as RBS.

Generally, the main objective of regenerative breaking system is to recover as much as possible torque while brakes are being applied. The kinetic energy of vehicle can be stored in another form of energy. In regenerative braking system, energy can be converted by means of generator, dynamometer, alternator, pump, compressor or flywheel or in other storage devices.

Now a day the regenerative breaking system is applied to many hybrid vehicles. But due to the complexity of design it can be applied to limited cars only. In this case, by using alternator or dynamo, the kinetic energy of the wheel, can be converted into the electric energy which is wasted while applying brakes.

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