"Borismaster" Set to be One of the Cleanest Buses on the Planet
2011-02-15 Source：www.chinabuses.org
www.chinabuses.org: For the revolutionary New Bus for London (NBfL) project, Cummins engineers are working closely with manufacturer Wrightbus to make it one of the cleanest on the planet. When the designers of London’s 21st Century re-creation of the iconic Routemaster bus were determining a powerplant for the new vehicle they looked no further than Cummins. They selected the ISBe 4.5 litre engine for the job, designed and manufactured in the UK. It is already capable of meeting the EEV ultra low emissions standard without the need for additional particulate exhaust aftertreatment.
Alongside the engine, Cummins Emission Solutions has worked closely with Wrightbus to develop a unique aftertreatment system that will allow the bus to meet the real world ultra low emissions targets needed for the project. While the oxides of nitrogen (NOx) and particulate matter (PM) emissions are reduced with the Euro V/EEV SCR system, an additional Diesel Oxidation Catalyst (DOC) is fitted between the engine and the SCR system to substantially reduce carbon monoxide (CO) and hydrocarbon (HC) emissions. The result is one of the cleanest buses on the planet and a carbon foot print less than half that of the majority of buses operating in London today.
The “Borismaster” will be “future proofed” by having the ability to incorporate a Euro 6 engine ready for when the legislation comes into force in 2013. This of course will reduce emission even further.
Mounted for the time being will be the ISBe 4.5 litre engine which provides 185hp and is mated to a Siemens hybrid transmission. The engine drives a generator which supplies energy to a lithium-phosphate battery pack, which in turn provides electrical current for the new electric drive motors. Regenerative braking feeds otherwise wasted kinetic energy back into the battery pack from the electric motors.
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