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| Whereas in conventional diesel engines injection pressure is generated for each injector individually, a common rail engine stores the fuel under high pressure in a central container ("common rail") and delivers it to the individual injectors on demand. Benefits of common rail injection are reduced noise levels, stronger performance, improved emission control and greater efficiency.
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Technology field: Optimisation of traction technologies
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General information
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General criteria
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Environmental criteria
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Impacts on energy efficiency:
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Energy efficiency potential for single vehicle: > 10% |
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Energy efficiency potential throughout fleet: 1 - 2% |
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According to manufacturer, the MTU 4000 common rail engine which is fitted for railway applications has a fuel consumption of 195 g/kWh, compared to values between 200 and 250 g/kWh for most diesel engines in service. Improvements in fuel economy to be obtained by common rail technology is highly dependent on point of reference. Automotive manufacturers claim 20% less fuel consumption compared to previous generation of engines (not specified). Compared to other state-of-the-art diesel solutions, improvements will be much smaller. In re-engining programmes for old locomotives, common rail technology may improve fuel economy by up to 30 % compared to 30 year old engines. |
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Other environmental impacts: positive |
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Reduced emission. |
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Economic criteria
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Application outside railway sector
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Overall rating
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 date created: 2002-10-09 |
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| © UIC - International Union of Railways 2003 |
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