05-01-2013, 03:41 PM
Hybrid Drive Systems for Rail Vehicles
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Hybrid Drive Systems for Rail Vehicles
Definition and Types of Hybrid Drive Systems
A hybrid vehicle uses two ore more distinct power sources to
propel the vehicle and/or the auxiliaries.
Common types of hybrid drive lines:
– Serial hybrid (electric power transmission)
– Parallel hybrid (electric, hydrodynamic or hydro-mechanical
power transmission)
Common applications of hybrid drive lines:
– Micro hybrid (Start-Stop of the engine and 2nd power source for
the auxiliaries)
– Mild hybrid (Start-Stop of the engine, 2nd power source for the
auxiliaries and to boost acceleration, recuperation)
– Full hybrid (2nd power source for propulsion)
Hybrid Drive Systems for Rail Vehicles
Application Examples of Hybrid Drive Systems
Each railway vehicle with bi-mode power transmission is a kind of
serial hybrid. The power transmission to the wheels occurs purely
electrically.
Parallel hybrids and micro hybrids for railways are not yet in serial
operation even though they offer some advantages.
– Suitable for retrofitting existing rolling stock with mechanical
or hydrodynamic power transmission
– All types of energy storage can be used (electric, hydraulic
or mechanical)
– No impact on the reliability of the main power transmission
– Relatively low investment costs, in particular for the mild hybrid
Hybrid Drive Systems for Rail Vehicles
Operating conditions
Very different load profile compared to road vehicles. The diesel engine
is used for propulsion for only 10% to 30% of the operating time.
Typical lifetime of a rail vehicle > 30 years.
Typical distance between overhauls > 1.2 million kilometers
The operating conditions of railway vehicles require special solutions
for the components of a hybrid drive system