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Volvo B5LH
The Volvo B5LH (initially known as the Volvo B5L Hybrid, also known as the Volvo BRLH) is a low-floor hybrid electric bus chassis for both single- and double-decker buses manufactured by Volvo since 2008. It is the basis for Volvo's integral 7700 Hybrid citybus and its successor, the 7900 Hybrid from 2011. In 2008, pre-production batches of both types of chassis were manufactured. Serial production started in June 2010.〔(Volvo to commence serial production of hybrid buses ) ''Volvo Buses'' 28 May 2010〕 From 2013 it is also available as an articulated bus chassis. First entering service in London, the B5LH is the only current double decker type in service in the United Kingdom that uses a parallel hybrid drive system.
==Design and Performance==
The B5LH is powered by Volvo's in-house parallel hybrid drive train that couple its I-SAM motor to a 5-litre D5-series diesel engine. The drive train is connected to the Volvo I-shift automatic transmission that drives the rear axle. The whole drive train is mounted in-line at the left rear of the chassis, similar to the B7L. A lithium battery pack is mounted just behind the front left wheel, powering the I-SAM motor system.
The B5LH features stop-start system that allows its engine to cut off when the bus is stationary, and the battery is sufficiently charged. It is also capable to drive at full electric mode from standstill to up to 20 kph. In service, Volvo claims that the B5LH achieves 35% improvement on fuel consumption and reduces the emission of green house gases, including carbon dioxide by an equivalent amount.〔(World Debut for Volvo Hybrid Double-deck ) ''Allaboutbuses'' 4 November 2008〕 In service data in London shows that the B5LH is demonstrating between 25 to 40% of fuel consumption improvement.〔(Hybrid Fuel Consumption – At Last The Truth? ) Boriswatch 24 June 2013〕
Initially, Wrightbus has been the solitary double-decker body supplier of the chassis. The pre-production batch were fitted with Eclipse Gemini bodywork, and production chassis to date received Eclipse Gemini 2 body. Currently a lighter Eclipse Gemini 3 & Gemini 3 bodywork are offered to the Euro 6 version of the chassis. Alexander Dennis is also offering its Enviro 400 bodywork to the chassis, following an order from Stagecoach in early 2014.〔(Stagecoach orders new hybrid vehicles for Tayside ) Stagecoach 27 March 2014〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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