Page 30 - Commercial Vehicle Engineer - September 2021
P. 30

 POINTS OF VIEW
 THE NEW BUS ROUTE TO ZERO EMISSIONS
 A new electric hybrid system offers bus and coach operators an easy way of achieving zero emissions when required, as an interim step to full electrification. Alex Schey from Allison Transmission explains how.
W ith an increasing number of cities around the world
introducing zero-emission zones (ZEZs), bus and coach fleet operators are
being obliged to adopt vehicles with cleaner propulsion systems. ZEZs are already in place, or planned for, cities in seven states across the USA, with more expected across North America soon. Meanwhile the UK’s first zero emission zone, introduced in Oxford city centre this August, won’t be
the nation’s last; and some of the many low-emission zones (LEZs) around the world – there are 250 in Europe alone – are potential ZEZs if/when municipal authorities tighten their emissions regulations.
In London, where the tender system to run public transport services provides bus operators with a guaranteed income for
a fixed period, it’s making sense for fleets
to purchase full electric buses. They are becoming more affordable for other parts of
the country too. Across mainland Europe, investment in low emissions buses tend to be mixed between electric-diesel hybrids and full-electric. But with all-electric propulsion, drivable range between battery charges is limited, installing electric- charging infrastructure can be hugely expensive, and the total cost of ownership higher than diesel for the time being. The unfamiliarity of maintenance departments with full-electric buses and infrastructure is also a concern.
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