Siemens Answers: Sustainable Future
Energy Efficiency in City Buses
June 01, 2010
Siemens Sanayi ve Ticaret A.Ş
Definition of City Bus
ƒ Start and stop frequently
ƒ Run at low average speeds
ƒ Operate for long hours;
from early morning until late at
night
ƒ Lifetime of 15 years or up to
60,000 operating hours
If the energy lost during braking could be saved and used for the next start,
the overall fuel consumption would go down:
Î Hybrid Drive with electrical storage is the solution!
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Where do the Savings come from?
Mainly from recuperation of braking energy
Further reasons for savings:
Start-stop function for
combustion engine
Optimized auxiliary concept
based on electric motors
Operate combustion engine
in optimum point, reduce
transients
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Reason for Hybrid Traction in City Buses
Based on the driving cycle, the
energy storage technology, the
electric components and an
advanced energy management,
a reduction of up to
40% in fuel and CO2 emissions
is possible.
ƒ
ƒ
ƒ
ƒ
Increased global and local pressure on emissions reduction
including CO2
Increased requirements for noise reduction
Increase in attractiveness and comfort
Achieve significant fuel savings to reduce operating costs
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Future Development of City Buses
City bus of the future has an electric drive - best case as “Zero Emission Vehicle”
Evolution
Conventional city bus
with combustion
engine
Optimizations in
engine and gearbox
City bus with parallel
hybrid
Zero emission vehicles
Dead end
Variants according to
Very little further
available type of energy
emission
reduction possible
Reduced emission and
fuel consumption
City bus with
electric charging
City bus with
battery + fuel cell
Revolution (System Change)
City bus with
series hybrid
(transient solution)
Time line
today
City bus with
battery ( & range
extender)
2015 ?
Development roadmap depends on innovation in energy storage
devices and fuel cells – taking into account the infrastructure.
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Flexibility3 with Siemens ELFA
Flexibility in bus size
The Siemens ELFA System is modular and can be adapted to the
performance requirements of the bus, i.e length, weight, climbing
ability etc.
Flexibility in energy mix
Following the technical progress, Siemens ELFA System can be
efficiently adapted to new energy sources, e.g. from diesel to pure
battery or fuel cell. This can be done at minimum effort for installation
and additional costs.
Flexibility in mechanical integration
The ELFA serial hybrid allows most freedom in arrangement of the
components since traction and power module are connected by
electrical wires
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Three examples of current reference projects
TEMSA Ultra-Cap Hybrid Bus
ƒ Standard low-floor 12 m city bus with ultracapacitor storage technology
ƒ Prototype successfully tested
Buses from Wrightbus for Las Vegas
ƒ Articulated diesel hybrid buses 18 m with new
PEM
motor technology, 400 kW max. power
ƒ Acceleration 0 – 50 km/h in 10 sec with 29 tons
full weight
New Bus for London from Wrightbus for London
ƒ 20 diesel hybrid buses delivered to TfL with up to
40% fuel saving in test results
ƒ Another 600 DD buses now ordered by TfL
as “New Bus For London”
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Vision for City Bus
Transport System of the
Future …
… how could it look
like?
Siemens Sanayi ve Ticaret A.Ş
Bus Transport System of the Future … a possible Vision
Battery Buses
Battery/UCap
Hybrid Buses
reduced
emission zone
reduced
emission zone
eBRT corridor
reduced
emission zone
Battery Hybrid Buses
eBRT corridor
zero
emission
zone
travel in the reduced emission zone and through
the zero emission zone
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01.06.2010
Manfred Schmidt
reduced
emission zone
UCap Hybrid
Buses
Siemens Answers: Sustainable Future
What is eBRT?
ƒ
Loading at stations
ƒ
Storage of energy on board
ƒ
100% electric propulsion
ƒ
no local CO2 emission
ƒ
silence & comfort
ƒ
high energetic efficiency
ƒ
optimized ride quality
Loading
interface
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Electric traction allows for New Options!
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Why Siemens?
ƒ Siemens ELFA puts the focus on serial hybrid drives
This type of hybrid drive allows maximum recuperation of braking energy and gives maximum
flexibility in control of the combustion engine (engine stop function).
This results in a reduction of fuel consumption up to 40% and the corresponding emission reduction.
Further, the serial hybrid drive is the platform for the “revolution” to a zero emission vehicle, e.g. fuel
cell, pure battery bus or electric charging bus.
ƒ The key components are made by Siemens
This ensures the highest manufacturing and quality standards together with optimized cost structure.
ƒ Maximum flexibility with the Siemens ELFA system
With the use of few standardized components the modular structure of the system allows fulfilment
of the OEM's individual performance requirements for various types and sizes of buses. In this way,
high production volume is achieveable, which save costs and increase quality.
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Siemens References
MAN, 12m Ucap Hybrid Bus
Mercedes Citaro Hybrid Bus
Van Hool Hybrid Bus
TEMSA Hybrid Bus
Mitsubishi FUSO Hybrid Bus
New Flyer Gasoline Hybrid
Fuel Cell Hybrid (Vancouver)
Faun, Hybrid Garbage Truck
Agrale Hybrid Bus
Ashok Leyland Hybrid Bus
TATA Hybrid Bus
Marine Application
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01.06.2010
Manfred Schmidt
Siemens Answers: Sustainable Future
Thank you for your attention!
Manfred Schmidt
Director Marketing & Sales Hybrid Drives
I DT LD T HD
Vogelweiherstrasse 1- 15
90441 Nuremberg
Mobile: +49 173 282 3436
E-mail: manfred.j.schmidt@ siemens.com
Siemens Sanayi ve Ticaret A.Ş