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Siemens Answers: Sustainable Future
Energy Efficiency in City Buses
June 01, 2010
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 2
Definition of City Bus
Start and stop frequentlyRun at low average speedsOperate for long hours;from early morning until late at nightLifetime 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:
Hybrid Drive with electrical storage is the solution!
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 3
Where do the Savings come from?
Further reasons for savings:
Start-stop function for combustion engine
Optimized auxiliary conceptbased on electric motors
Operate combustion engine in optimum point, reduce transients
Mainly from recuperation of braking energy
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 4
Reason for Hybrid Traction in City Buses
Increased global and local pressure on emissions reduction including CO2 Increased requirements for noise reductionIncrease in attractiveness and comfortAchieve significant fuel savings to reduce operating costs
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.
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 5
Future Development of City BusesCity bus of the future has an electric drive - best case as “Zero Emission Vehicle”
Development roadmap depends on innovation in energy storage devices and fuel cells – taking into account the infrastructure.
Optimizations in engine and gearbox
City bus withseries hybrid(transient solution)
City bus withbattery ( & range extender)
Dead end
Very little further emissionreduction possible
Conventional city bus with combustionengine
Time line today 2015 ?
City bus with parallel hybrid
City bus with electric charging
Zero emission vehicles
Variants according to available type of energy
Evolution
City bus withbattery + fuel cellRevolution (System Change)
Reduced emission andfuel consumption
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 6
Flexibility3 with Siemens ELFA
Flexibility in bus sizeThe 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 mixFollowing 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 integrationThe ELFA serial hybrid allows most freedom in arrangement of thecomponents since traction and power module are connected by electrical wires
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 7
Three examples of current reference projects
TEMSA Ultra-Cap Hybrid BusStandard low-floor 12 m city bus with ultra-capacitor storage technologyPrototype successfully tested
Buses from Wrightbus for Las VegasArticulated diesel hybrid buses 18 m with new PEMmotor technology, 400 kW max. powerAcceleration 0 – 50 km/h in 10 sec with 29 tonsfull weight
New Bus for London from Wrightbus for London20 diesel hybrid buses delivered to TfL with up to40% fuel saving in test resultsAnother 600 DD buses now ordered by TfLas “New Bus For London”
Siemens Sanayi ve Ticaret A.Ş
Vision for City Bus Transport System of theFuture …
… how could it looklike?
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 9
Bus Transport System of the Future … a possible Vision
zero emission
zoneeBRT corridor
eBR
Tco
rrido
rreduced emission zone
reduced emission zone
reduced emission zone
reduced emission zone
Battery Buses
UCap Hybrid Buses
Battery/UCapHybrid Buses
Battery Hybrid Busestravel in the reduced emission zone and through the zero emission zone
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 10
What is eBRT?
Loading at stations
Storage of energy on board
100% electric propulsion
no local CO2 emission
silence & comfort
high energetic efficiency
optimized ride quality
Loadinginterface
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 11
Electric traction allows for New Options!
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 12
Why Siemens?
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.
The key components are made by Siemens
This ensures the highest manufacturing and quality standards together with optimized cost structure.
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.
Siemens Answers: Sustainable Future01.06.2010 Manfred SchmidtPage 13
Siemens References
MAN, 12m Ucap Hybrid Bus Mercedes Citaro Hybrid Bus Van Hool Hybrid Bus TEMSA Hybrid Bus
Mitsubishi FUSO Hybrid Bus Faun, Hybrid Garbage TruckNew Flyer Gasoline Hybrid Fuel Cell Hybrid (Vancouver)
Agrale Hybrid Bus Marine Application Ashok Leyland Hybrid Bus TATA Hybrid Bus