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New boris bus breaks down
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On Mon, 19 Dec 2011 10:28:03 +0000 Roland Perry wrote: In message , at 09:50:09 on Mon, 19 Dec 2011, d remarked: Oh dear. Not off to a good start then. http://www.lbc.co.uk/new-routemaster...dy-photo-48777 Sounds like the battery went flat. Who knows. Probably the hybrid drive system still has some issues to sort out. On the radio they said it was going northbound so perhaps they already knew about the problem and were trying to get it somewhere to sort it out but didn't make it. I speculate that the range-extender hybrid drive is designed for stop-start operation, with the engine having lots of opportunities to charge the battery when the bus is picking up pax or stoppd in traffic. Regenerative brakes will also help keep the battery charged in stop-start traffic. The engine may not have enough continuous output for the bus to go long distances at relatively higher speeds on a motorway. It's also possible that the battery wasn't fully charged at the start of the journey. I wonder if, in normal operation, it's planned that the batteries will be fully topped up overnight in the depot? According to the Autocar review of the bus, the 4-cylinder diesel generator has a max power of only 182bhp (which is less than my car), which is used not only to charge the battery, but also to power the air compressor for the brakes and steering. The battery is rated at 75kWh. |
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