Arriva Buses Wales - Wrexham Depot

[R557 ABA]

RE: Arriva Buses Wales - Wrexham Depot

(24/09/2013 13:09)KU02 YUH Wrote:  

(24/09/2013 12:38)CX54 DKD Wrote:  There's no such thing as 'safe mode', it's a myth. They're tuned down to improve component life and reduce fuel burn.

That's not true. The dashboard manual, which came with the Optare Versa that Impera had a few months ago, mentioned that if a certain emissions light illuminated on the dashboard, the bus would feature a deduction in power (thus the bus would do so automatically). Obviously, buses can be turned-down for the reason that you've said, but that isn't always the case (unless Optare vehicles are the only ones to do such a thing).

It is true that all modern vehicles from Alexander Dennis, Optare, VDL and so on have a feature, in which, if it is has an engine which uses Selective Catalytic Reduction along with Adblue (mainly Cummins engines with Allison or ZF transmission) along with an Emission After-treatment System. The economy mode is activated when either the Adblue tank is empty, the Adblue supply is interrupted and the EAS system is turned off or there is a fault in the EAS system. The vehicle will automatically enter the engine and gearbox into an emissions friendly setting by reducing the engine torque by 40% to ensure that the exhaust gas emissions don't exceed the legal limits.