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Copy of Regenerative braking system

Seminar By : ABHISHEK SHETTIGAR Guided By : Dr. Ananth . S . Iyengar Associate Professor, Dept. of Mechan

Hanna Nicholson

on 10 June 2013

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Transcript of Copy of Regenerative braking system

Associate prof.
mechanical dept,
mite Every time you step on your car's brakes, you're wasting energy!!!
Physics tells us that energy cannot be destroyed.
Most of the kinetic energy simply dissipates as heat and becomes useless INTRODUCTION There is extreme difficulty in finding a place to recharge a hybrid. This makes longer trips difficult without relying on the hybrid's internal combustion engine The vast majority of the kinetic energy is converted into heat by your brake pads when you stamp on the brakes. But automotive engineers have come up with a kind of braking system that can recapture much of the car's kinetic energy and convert it into electrical energy, so that it can be used to recharge the car's batteries. This system is called Regenerative Braking. REGENERATIVE BRAKING A regenerative brake is an energy recovery mechanism which slows a vehicle by converting its kinetic energy into electrical energy, which can be either used immediately or stored until needed This contrasts with conventional braking systems, where the excess kinetic energy is converted to heat by frictionand therefore wasted. The most common form of regenerative braking takes places electric or hybrid cars.In these types of cars the energy typically lost to heat from the friction of the brake pads can be transferred into electricity to recharge the battery of the car. With regenerative brakes, on the other hand, the system that drives the vehicle does the majority of the braking. In a traditional braking system- friction is produced between brake pads & the brake rotors to slow or stop the vehicle.
Additional friction- Wheels & Roads WORKING When the driver steps on the brake pedal of an electric or hybrid vehicle, these types of brakes put the vehicle's electric motor into reverse mode. While running backwards, the motor also acts as an electric generator, producing electricity. Which causes it to run backwards, thus slowing the car's wheels. The produced electricity is then fed into the vehicle's batteries.
However, hybrids and fully electric cars also have friction brakes, as a kind of back-up system. Speed of the vehicle:
Low speed-less energy is generated

Capacity of the battery:
If it is fully charged-voltage may rise above safe limit

Energy conversion efficiency:
motor-inverter- battery Factors involved during charging Interesting properties of an electric motor is that, when it's run in one direction, it converts electrical energy into mechanical energy that can be used to perform work.

But when the motor is run in the opposite direction, a properly designed motor becomes an electric generator, converting mechanical energy into electrical energy. REGENERATIVE BRAKING CIRCUITS During Acceleration During Deceleration Brake controllers are electronic devices that can control brakes, deciding when braking begins, ends, and how quickly the brakes need to be applied. REGENERATIVE BRAKING CONTROLLERS The regenerative braking controller is similar to an ABS controller, which monitors the rotational speed of the wheels and the difference in speed from one wheel to another. The brake controller directs the electricity produced by the motor into the batteries. Ensures that the inflow of electricity isn't more than the batteries can handle. Brake controller can calculate how much torque & rotational force is available to generate electricity to be fed back into the batteries. The most important function of the brake controller, however, may be deciding whether the motor is currently capable of handling the force necessary for stopping the car. If it isn't, the brake controller turns the job over to the friction brakes. This reduces the fears about carbon emissions which are coming to a peak. REGENERATIVE BRAKING BENEFITS These kinds of brakes allow batteries to be used for longer periods of time without the need to be plugged into an external charger. These types of brakes also extend the driving range of fully electric vehicles. Reduction of pollution Braking is not total loss Railway vehicle – The Delhi Metro saved around 90,000 tons of carbon dioxide (CO2) from being released into the atmosphere by regenerating 112,500 megawatt hours of electricity through the use of regenerative braking systems. Conventional brakes apply friction to convert a vehicle’s kinetic energy into heat. In energy terms, therefore, braking is a total loss: once heat is generated, it is very difficult to reuse. The regenerative braking system, however, slows a vehicle down in a different way The regenerative braking effect drops off at lower speeds
Regenerative braking is not effective at high speed or emergency purpose, therefore the friction brake is still required in order to bring the vehicle to a complete halt. LIMITATIONS OF REGENERATIVE BRAKING SYSTEM The friction brake is a necessary back-up in the event of failure of the regenerative-brake. Regenerative braking is necessarily limited when the batteries are fully charged REGENERATIVE BRAKING CONCLUSION This could reduce fuel consumption by 10 to 25 per cent. The energy efficiency of a conventional car is only about 20 percent, with the remaining 80 percent of its energy being converted to heat through friction. The miraculous thing about regenerative braking is that it may be able to capture as much as half of that wasted energy and put it back to work. THANK YOU.... 1.“ Regenerative brake”

2.“How regenerative braking works”
http://auto.howstuffworks.com/auto-parts/brakes/brake-types/regenerative- braking.htm

3.“ What is regenerative braking”

4. “ Regenerative braking system”

5.“ Regenerative braking: Necessity drives invention “
http://www.wheels.ca/columns/article/801612 REFERENCE
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