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Hybrid Electric Vehicles
TECHNICAL PRESENTAION
INTRODUCTION (HEV)

•A hybrid electric vehicle (HEV) is a type of hybrid vehicle and electric
vehicle which combines a conventional internal combustion engine (ICE)
propulsion system with an electric propulsion system. The presence of the
electric power train is intended to achieve either better fuel economy than a
conventional vehicle or better performance.

•Modern HEVs make use of efficiency-improving technologies such
as regenerative braking, which converts the vehicle's kinetic energy into
electric energy to charge the battery, rather than wasting it as heat energy
as conventional brakes do.
WORKING OF A HEV




A conventional vehicle has a mechanical drive train that includes
the fuel tank, the combustion engine, the gear box, and the
transmission to the wheels.
A HEV has two drive trains - one mechanical and one electric.
The electric drive train includes a battery, an electric motor, and
power electronics for control.
• Power generated from Combustion
engine

•Power generated from electric
motor
•Power generated from Electric motor and
Engine.

•General insight of an hybr
Car with varying situations
Hybrid Vehicles With different patterns


In parallel hybrids, the ICE and
the electric motor are both connected to
the mechanical transmission and can
simultaneously transmit power to drive
the wheels, usually through a
conventional transmission. The internal
combustion engine of many parallel
hybrids can also act as a generator for
supplemental recharging. Parallel hybrids
are more efficient than comparable nonhybrid vehicles especially during urban
stop-and-go conditions where the electric
motor is permitted to contribute, and
during highway operation.



In series hybrids, only the electric
motor drives the drive train, and a
smaller ICE works as a generator to
power the electric motor or to
recharge the batteries. They also
usually have a larger battery pack
than parallel hybrids, making them
more expensive. Once the batteries
are low, the small combustion engine
can generate power at its optimum
settings at all times, making them
more efficient in extensive city driving.
Plug in Hybrids (PHEV)
A plug-in hybrid electric vehicle (PHEV), also known as a plug-in hybrid, is a
hybrid electric vehicle with rechargeable batteries that can be restored to full
charge by connecting a plug to an external electric power source. A PHEV
shares the characteristics of both a conventional hybrid electric
vehicle, having an electric motor and an internal combustion engine and of
an all-electric vehicle also having a plug to connect to the electrical grid.
PHEVs have a much larger all-electric range as compared to conventional
gasoline-electric hybrids, because the combustion engine works as a backup
when the batteries are depleted.
Comparison of CO2 and non-CO2 emission reductions for
various vehicles



Pure CNG vehicles emit less air pollutants than
standard petrol and diesel vehicles due to natural gas
being a cleaner burning fuel. CNG vehicles are usually
also equipped with a catalyst, thus lowering emissions
even further.



Clean diesel vehicles need advanced emission control
technologies and ultra low sulphur diesel (15 ppm or
less) for optimal emission reductions. However, with the
use of advanced emission control technologies and
ultra low sulphur diesel.



In a HEV, the combustion engine is less exposed to
accelerations (transient loads) and burns fuel under
more stable conditions, thus emitting less pollution and
CO2 than an engine in a conventional vehicle.
Degrees of Hybridization


A petrol engine in a conventional car has an average engine
efficiency 20 of 17%-20%under normal driving conditions. Most
of the energy in the fuel is lost as heat and a smaller part as
engine friction. However, of the remaining energy out from the
engine approximately10%-12% is lost during idling and another
20%-30% is ‘lost’ when braking. In conclusion, only12%-14% of
the energy supplied as fuel is actually used to move the car
forward.
 HEVs can deal with some of these energy losses using different
kinds of technologies designed to harness and utilize ‘lost’
energy, as described in figure 11. The degrees ranging from
‘mild HEV’, to ‘full HEV’ and ‘PHEV’ refer to the technologies
used and, in general, increased degrees of fuel efficiency.
Battery requirements




The first generation HEVs were sluggish since the battery
development had not aimed for high specific power, i.e. they
could not discharge energy quickly enough. This has been
partly rectified by the development of improved battery types:
nickel/metal hydride and lithium-ion batteries. Current HEV
batteries provide the vehicle with ample power for driving but
development is still ongoing, focusing on cost reduction and
extending the lifetime.
The power required for HEV function is supplied by large
battery stacks, usually between50-70 kg for passenger cars
25 and 250-600 kg for bus batteries. Most HEV buses today
are fitted with a lead acid battery, but the use of more
advanced and expensive but better and longer lifetime nickel
metal hydride batteries is increasing for buses as is already
the case for passenger cars.
BATTERY RECHARGING







The Ni-MH batteries are recharged through a process call
regenerative braking
Regenerative braking takes energy from the forward
momentum of the vehicle and captures it while coasting or
braking.
Occasionally batteries are recharged by the electric motor
It is expected that most PHEV and EV owners will recharge
their vehicles overnight at home.
Economics of Hybrid Technology


The purchase price of a hybrid vehicle is higher compared to a
conventional vehicle, both for passenger cars, buses, and trucks.
However, given the lower fuel consumption, the total cost of
ownership or life cycle cost of buying and using a hybrid can be
equal to or even lower than buying and using a conventional vehicle
- depending on yearly mileage and fuel prices. The life cycle cost
does not only include the cost of purchasing the vehicle but also the
cost of fueling and maintenance.



The retail price for a hybrid is roughly 3,000-6,000 USD more than a
conventional model of a similar car.
Policy Measures
The four key policy-relevant and consumer choice advantages
of HEVs over conventional and comparably clean and
efficient technology (clean diesel, CNG) can be summarized
as follows:
 Emissions – Available HEV technology will decrease
emissions of conventional air pollutants substantially as
compared to a standard vehicle on the roads today. While
similar emission reductions can be achieved with, e.g. CNG
and clean diesel vehicles with advanced emission control
technologies, the HEV combines both non-CO2 andCO2
reductions.
 Energy - HEVs decrease fuel consumption substantially
compared to conventional vehicles used today and also
compared to CNG and the new generation of cleaner diesel
vehicles. Calculations have shown that over the average HEV
useful life time savings can amount to 6,000 L of fuel.




Life Cycle Cost – While HEVs are more expensive
initially, the fuel savings are recouped based on mileage and
driving conditions. Analysis has shown that the HEV life cycle
cost, including the cost of purchase, fuel and maintenance
costs, is, in most cases, less than owning a conventional
vehicle. However, these calculations are strongly dependent
on fuel prices, taxes and rebates.
Strategic Stepping Stone Technology - HEVs, plug-in
hybrids, full electric vehicles, and fuel cell vehicles share
basic technologies such as electric motors, batteries, and
power electronics. Therefore, HEVs and plug-in hybrids
function as stepping stone technologies to the large-scale
electrification of fleets that is required for a long-term
reduction of CO2 emissions from road transport, and a low
carbon transport sector.
The HEV Production
Conclusion


HEV technology for both light and heavy duty applications is
commercially available today and demonstrates substantial
reductions in tail-pipe emissions and fuel consumption, even when
compared to other available low emission technologies. HEVs are
particularly effective for urban travel, significantly lowering pollutant
emissions and providing cost-effective CO2 reductions in personal
mobility. Encouraging hybridization of vehicle fleets through enabling
policies and incentive structures can serve to lower both
conventional and CO2 emission, thus improving public
health, energy security, and reducing fuel costs. Continuing
innovation in hybrid technology and a growing demand for cleaner
vehicles will mean that costs are likely to fall, particularly in second
hand vehicle markets.

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Hybrid Electric vehicles

  • 2. INTRODUCTION (HEV) •A hybrid electric vehicle (HEV) is a type of hybrid vehicle and electric vehicle which combines a conventional internal combustion engine (ICE) propulsion system with an electric propulsion system. The presence of the electric power train is intended to achieve either better fuel economy than a conventional vehicle or better performance. •Modern HEVs make use of efficiency-improving technologies such as regenerative braking, which converts the vehicle's kinetic energy into electric energy to charge the battery, rather than wasting it as heat energy as conventional brakes do.
  • 3. WORKING OF A HEV   A conventional vehicle has a mechanical drive train that includes the fuel tank, the combustion engine, the gear box, and the transmission to the wheels. A HEV has two drive trains - one mechanical and one electric. The electric drive train includes a battery, an electric motor, and power electronics for control.
  • 4. • Power generated from Combustion engine •Power generated from electric motor
  • 5. •Power generated from Electric motor and Engine. •General insight of an hybr Car with varying situations
  • 6. Hybrid Vehicles With different patterns  In parallel hybrids, the ICE and the electric motor are both connected to the mechanical transmission and can simultaneously transmit power to drive the wheels, usually through a conventional transmission. The internal combustion engine of many parallel hybrids can also act as a generator for supplemental recharging. Parallel hybrids are more efficient than comparable nonhybrid vehicles especially during urban stop-and-go conditions where the electric motor is permitted to contribute, and during highway operation.  In series hybrids, only the electric motor drives the drive train, and a smaller ICE works as a generator to power the electric motor or to recharge the batteries. They also usually have a larger battery pack than parallel hybrids, making them more expensive. Once the batteries are low, the small combustion engine can generate power at its optimum settings at all times, making them more efficient in extensive city driving.
  • 7. Plug in Hybrids (PHEV) A plug-in hybrid electric vehicle (PHEV), also known as a plug-in hybrid, is a hybrid electric vehicle with rechargeable batteries that can be restored to full charge by connecting a plug to an external electric power source. A PHEV shares the characteristics of both a conventional hybrid electric vehicle, having an electric motor and an internal combustion engine and of an all-electric vehicle also having a plug to connect to the electrical grid. PHEVs have a much larger all-electric range as compared to conventional gasoline-electric hybrids, because the combustion engine works as a backup when the batteries are depleted.
  • 8. Comparison of CO2 and non-CO2 emission reductions for various vehicles  Pure CNG vehicles emit less air pollutants than standard petrol and diesel vehicles due to natural gas being a cleaner burning fuel. CNG vehicles are usually also equipped with a catalyst, thus lowering emissions even further.  Clean diesel vehicles need advanced emission control technologies and ultra low sulphur diesel (15 ppm or less) for optimal emission reductions. However, with the use of advanced emission control technologies and ultra low sulphur diesel.  In a HEV, the combustion engine is less exposed to accelerations (transient loads) and burns fuel under more stable conditions, thus emitting less pollution and CO2 than an engine in a conventional vehicle.
  • 9. Degrees of Hybridization  A petrol engine in a conventional car has an average engine efficiency 20 of 17%-20%under normal driving conditions. Most of the energy in the fuel is lost as heat and a smaller part as engine friction. However, of the remaining energy out from the engine approximately10%-12% is lost during idling and another 20%-30% is ‘lost’ when braking. In conclusion, only12%-14% of the energy supplied as fuel is actually used to move the car forward.  HEVs can deal with some of these energy losses using different kinds of technologies designed to harness and utilize ‘lost’ energy, as described in figure 11. The degrees ranging from ‘mild HEV’, to ‘full HEV’ and ‘PHEV’ refer to the technologies used and, in general, increased degrees of fuel efficiency.
  • 10. Battery requirements   The first generation HEVs were sluggish since the battery development had not aimed for high specific power, i.e. they could not discharge energy quickly enough. This has been partly rectified by the development of improved battery types: nickel/metal hydride and lithium-ion batteries. Current HEV batteries provide the vehicle with ample power for driving but development is still ongoing, focusing on cost reduction and extending the lifetime. The power required for HEV function is supplied by large battery stacks, usually between50-70 kg for passenger cars 25 and 250-600 kg for bus batteries. Most HEV buses today are fitted with a lead acid battery, but the use of more advanced and expensive but better and longer lifetime nickel metal hydride batteries is increasing for buses as is already the case for passenger cars.
  • 11. BATTERY RECHARGING     The Ni-MH batteries are recharged through a process call regenerative braking Regenerative braking takes energy from the forward momentum of the vehicle and captures it while coasting or braking. Occasionally batteries are recharged by the electric motor It is expected that most PHEV and EV owners will recharge their vehicles overnight at home.
  • 12. Economics of Hybrid Technology  The purchase price of a hybrid vehicle is higher compared to a conventional vehicle, both for passenger cars, buses, and trucks. However, given the lower fuel consumption, the total cost of ownership or life cycle cost of buying and using a hybrid can be equal to or even lower than buying and using a conventional vehicle - depending on yearly mileage and fuel prices. The life cycle cost does not only include the cost of purchasing the vehicle but also the cost of fueling and maintenance.  The retail price for a hybrid is roughly 3,000-6,000 USD more than a conventional model of a similar car.
  • 13. Policy Measures The four key policy-relevant and consumer choice advantages of HEVs over conventional and comparably clean and efficient technology (clean diesel, CNG) can be summarized as follows:  Emissions – Available HEV technology will decrease emissions of conventional air pollutants substantially as compared to a standard vehicle on the roads today. While similar emission reductions can be achieved with, e.g. CNG and clean diesel vehicles with advanced emission control technologies, the HEV combines both non-CO2 andCO2 reductions.  Energy - HEVs decrease fuel consumption substantially compared to conventional vehicles used today and also compared to CNG and the new generation of cleaner diesel vehicles. Calculations have shown that over the average HEV useful life time savings can amount to 6,000 L of fuel.
  • 14.   Life Cycle Cost – While HEVs are more expensive initially, the fuel savings are recouped based on mileage and driving conditions. Analysis has shown that the HEV life cycle cost, including the cost of purchase, fuel and maintenance costs, is, in most cases, less than owning a conventional vehicle. However, these calculations are strongly dependent on fuel prices, taxes and rebates. Strategic Stepping Stone Technology - HEVs, plug-in hybrids, full electric vehicles, and fuel cell vehicles share basic technologies such as electric motors, batteries, and power electronics. Therefore, HEVs and plug-in hybrids function as stepping stone technologies to the large-scale electrification of fleets that is required for a long-term reduction of CO2 emissions from road transport, and a low carbon transport sector.
  • 16. Conclusion  HEV technology for both light and heavy duty applications is commercially available today and demonstrates substantial reductions in tail-pipe emissions and fuel consumption, even when compared to other available low emission technologies. HEVs are particularly effective for urban travel, significantly lowering pollutant emissions and providing cost-effective CO2 reductions in personal mobility. Encouraging hybridization of vehicle fleets through enabling policies and incentive structures can serve to lower both conventional and CO2 emission, thus improving public health, energy security, and reducing fuel costs. Continuing innovation in hybrid technology and a growing demand for cleaner vehicles will mean that costs are likely to fall, particularly in second hand vehicle markets.