1. A SEMINAR ON REGENERATIVE BRAKING SYSTEM
By:-
Pratik P. Shinde.
T. E. Mechanical Engineering

2. Importance of Brake…..
At the time of purchasing vehicle we concern with Speed, average, design, C.C, etc. but no one look for brakes…
It has equal importance like others….

3. What is Brake….????
It is the machine element and its principle object is to absorb energy during deceleration.

4. How it works…….??
When you step down brake pedal of your car, it allows certain process to ensure that you stop...

5. Requirements of good braking system
It Should stop the vehicle in shortest distance and time.
It Should have less wearing parts.
It Should required less maintenance.
It Should be minimum sound when applied.

6. Losses during Braking….
Every time you step on your car's brake , you're wasting energy. Physics tells us that energy can not be destroyed. So when your car slows down, the kinetic energy that was propelling it forward has to go somewhere. Most of it simply dissipates as heat and becomes useless.

7. What is regenerative braking..?
Braking method in which the mechanical energy from the load is converted into electric energy and regenerated back into the line is known as Regenerative Braking.
This type of system is only useful in Hybrid vehicle or fully electric cars.

8. What is Hybrid vehicle…?
When two or more power sources are combined in a vehicle, directly or indirectly providing propulsive power is called hybrid vehicle.

9. Losses at the time of braking
For heavy loaded truck having very few stops on the road:-
80% energy to overcome the rolling and aerodynamic road forces, energy wasted in brake is about 2%.
Vehicle which operated in the main city:- wastage of energy by application of brake is about 60% to 65%.

10. ELEMENTS OF THE SYSTEM Motor as a generator…. Energy storage unit…
Batteries
Flywheel
Fuel cell
3. Continuously variable transmission
4. Control system

11. How regenerative braking system works?

12. DESCRIPTION & OPERATION
Vehicle has forward momentum
The wheels are coupled to the rotors of electric traction motors in vehicle.
Instead of a current being applied to the motor to turn the rotors, the rotors are turned by the wheels of the Vehicle.
The rotors experience opposing torque as current is induced in the motor coils
This opposing torque slows the vehicle
The generated electrical energy is stored

13. Cars with Regenerative Braking
Toyota Prius
Honda Insight
Ford Escape Hybrid
Tesla Roadster
Chevy Volt
It actually does have
regenerative braking*
Toyota Prius

14. Benefits of Regenerative Braking
Increase of overall energy efficiency of a vehicle
Increases vehicle range
Cuts down on pollution related to electricity generation
Increases the lifespan of friction braking systems
Less use of traditional mechanical brakes leads to less wear over time

15. Disadvantages... Added complexity of brake control system
Only works for wheels connected to motors
Friction brakes are still necessary
Safety
Motor braking power decreases as the kinetic energy of the vehicle decreases

16. CONCLUSION
Theoretical investigations of a regenerative braking system show about 25% saving in fuel consumption.
The lower operating and environment costs of a vehicle with regenerative braking system should make it more attractive than a conventional one. The traditional cost of the system could be recovered in the few years only.
The exhaust emission of vehicle using the regenerative braking concept would be much less than equivalent conventional vehicles as less fuel are used for consumption.
These systems are particularly suitable in developing countries such as India where buses are the preferred means of transportation within the cities.

17. Sources
Gitlin, Jonathan M. "McLaren and Freescale partner up for regenerative braking."  Ars Technical. Nov. 5, (Jan. 13, 2009) 
Cantwell, Katie. "Regeneration Overview." Rockwell Automation Allen-Bradley. May 7, (Jan. 13, 2009) 
Chen, Jason. "Panasonic Makes Electric Bike with Regenerative Braking." Gizmodo.  July 7, (Jan. 13, 2009) 

18. Thank you….