Transcript Regenerative Braking

Regenerative Braking Systems
Presented by
Chaitanya G. Gosavi
B.E. Mechanical
Government Engineering College, Aurangabad
Introduction…

Energy Crisis
Need of Regenerative Braking
system…

Loss in braking

1500 kg car, 100-0 km/h = 0.16 Kwh
Regenerative Braking Systems

Mostly used In Hybrid & Electric vehicles
Working…
Video…
System Components…
IC Engine
 Motor Generator 1 (MG1)
 Motor Generator 2 (MG2)
 Planetary Gear Set
 Inverter
 High Voltage Electronic Control
Unit (HV ECU)
 High Voltage battery
(HV Battery)

 Motor/
Generator 1 (MG)
- CVT function
- engine starter
 Motor
Generator 2
- Connected to wheels
- Used at low speeds
Motor/Generator
Planetary Gearbox

Creates all of the different gear ratios that
the transmission can produce

The sun gear,
The planet gears
& The planet gears
carrier The ring gear.
Planetary Gearbox
 Inverter
- Current between MG1, MG2 and HV
battery
- HV battery DC to AC power
- Rectifies HV AC from MG1 and MG2 to
recharge HV battery.
 Battery
- Toyota Prius –
28 Nickel Metal Hydride
- Total Voltage 201.6 V
Strategies for RBS…

Series braking

Series braking with optimal energy
recovery
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Parallel Braking
Kinetic Energy Recovery System
(KERS)

KERS is a device that is set to
revolutionize the Automobile sector

Transferring the
vehicle’s kinetic energy
using Flywheel energy
storage
A KERS flywheel

There are basically 2 types of KERS
1] Electronic KERS
2] Mechanical KERS
Mechanical KERS

Completely based
carbon flywheel

Linked through CVT
to the differential

Input disc and
opposing output disc

Two or three rollers
are located inside each toroidal cavity
Flybrid KERS

Flybrid is complex
and integral differential
based system

Weights 24 kg
Flybrid KERS
- energy capacity of 400 kJ
- (Allowing energy losses)
- 64,500 rpm
- occupies a volume of 13 liters.
KERS in Formula 1…..
Formula1 2009 season
 FIA allowed the use of 60 kW KERS
 Ferrari, Renault, BMW, and McLaren

Energy efficiency - petrol-electric hybrid is
about 37%,
F1 car with Mechanical KERS is about 60%.
 FIA restricted power – 60 Kw
Actual power delivery capacity – 100Kw

Applications of RBS…

Electric railway
- Virgin Trains, UK
-17% Savings
- The Delhi Metro - saved 90,000 tons of
Carbon Dioxide (CO2) from being
released Between 2004-2007
- 112,500 megawatt hours of electricity
- expected that Delhi Metro will save over
100,000 tons of CO2 after comlition of
phase II
Hybrid & Electric Cars
Toyota Prius
Chevrolet Volt
Tesla Roadster
The Future….

Integration - powertrain and brake
systems to provide better traction and
stability control

Integration of ‘Antilock braking systems’
(ABS) with the motor controller
To end up with….

RBS and KERS are key for the solution
to reduce pollution due to vehicles.

Reduction in the fuel losses.

Efficient performance.
Refreneces
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Autocar India (Car Magazine)
Overdrive (Car Magazine)
Top Gear (Car Magzine)
SAE Technical paper series
Regenerative Braking - William Price
http://worldofcarfans.com/
http://auto.howstuffworks.com/autoparts/brakes/brake-types/regenerativebraking.htm
http://alternativefuels.about.com/od/glossary/g/r
egenbraking.htm
Thank You !