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Scania delivers world’s cleanest diesel-powered city buses to ACTION

Scania has delivered the first of a fleet of 77 new diesel-powered city buses that will be the cleanest in Australia, thanks to the application of Euro 6 emissions technology.

The Scania K 320 UB 4x2 LB powertrain features Scania’s Selective Catalytic Reduction exhaust after-treatment, which complies with the latest, most stringent European (and world-leading) standards. 

ACTION is the first bus operator in Australia to adopt this advanced level of technology, putting the nation’s capital city fleet at the leading edge of pollution reduction. 

Because Australian city buses have extended working lives, typically between 20-25 years, some of the oldest and most heavily polluting vehicles are still in operation in our major urban centres.  

So each new Euro 6 bus Scania delivers in Australia is likely to replace an older, heavily polluting vehicle. 

Australian Capital Territory Internal Omnibus Network (ACTION) placed the order for the country’s first fleet of Euro 6 12.5m route buses with Scania last year. 

The Euro 6 technology reduces the Nitrogen Oxides in the exhaust gases by 80% and the diesel particulate filter removes 99% of particulate matter, which leads to a significant reduction in air-borne pollutants compared with the current Australian Euro 5 standards, themselves vastly improved upon the earlier mandated standards. 

“Last year, ACTION decided it wanted to take a lead in the introduction of Euro 6 emission technology to bus fleets in Australia,” says Trevor O’Brien, National Bus Manager – Government Contracts, for Scania Australia.  

“Each of the buses they introduce with this technology will make a significant impression in the reduction of air pollution caused by older bus engines in and around Canberra.  

“By extension, as we roll out further Euro 6 compliant buses in other capital cities, a dent will be made in the amount of air-borne pollution emanating from older bus engines,” he says. 

In recent times, ACTION has added 33 new articulated Scania-based Euro 5 buses onto its fleet, complementing the 26 Scania 14.5m rigid and 54 Scania CNG buses already in operation. 

“ACTION is part of the ACT’s Territory and Municipal Services Directorate. It owns and operates the buses in its fleet, and its decision to lead with Euro 6 compliant vehicles reflects the Territory government’s desire to ensure the national capital is as clean and green as possible,” Mr O’Brien says. 

“The Australian Federal Government is yet to announce a date for the introduction of Euro 6 emission standards, underlining the progressive action of the ACT operator,” he says. 

Euro 6 compliance for all new buses and trucks came into force in Europe on 1st January 2014. 

The new Scania K 320 buses are fitted with the Australian designed and built ‘Rigid Easy Access Bus’ bodies constructed by Custom, using the latest CB80 designation body, with seats for 48 and 18 standees.  

“These vehicles will replace buses that have been plying the national capital’s roads since the 1980s, reflecting the 25-year operating life demanded by Australian public transport operators,” Mr O’Brien says. 

“We have enjoyed a positive and fruitful working relationship with ACTION for several years, and recently they assisted us with a reliability trial for a new generation of CNG engines, as they operate their own fleet of 54 gas buses,” he says. 

Scania Euro 6 technical specifications 

Chassis: Scania K 320 UB 4x2 LB 

Body: Custom CB80 12.5m

  Engine: Scania Euro 6 320 hp 5-cylinder in-line, DC09 108/320, SCR only, XPI extra high pressure injection system, plus diesel particulate filter 

Capacity: 9.3-litres 

Power: (320 hp) 235kW@1900rpm;  

Torque: 1600 Nm@1050-1300rpm

  Transmission:  

ZF 6-speed automatic with push button D-N-R (Drive, Neutral, Reverse) 

ZF retarder 

Suspension: Air suspension all round, with kneeling function at front 

Front and rear anti-roll bar 

Axle front weight (max) 7100 kg 

Axle rear weight  (max) 12000kg 

Axle distance after local modifications: 6350mm 

Total Technical weight (max) 19100kg 

Rear axle ratio: 5.57:1 

Tyres: 295/80 R22.5 front and rear 

Brakes: Disc brakes 

Safety systems: ESP, daytime running lamps 

Scania Euro 6 emission benefits 

• Far fewer Oxides of Nitrogen (one fifth of those allowed under Euro 5) 

• Far fewer diesel particulates (required to be counted)  

• 99% of particulates are removed prior to exhaust gas exiting to atmosphere 

Euro 6 emission levels 

Nitrogen oxides: 0.4 g/kWh (2 g/kWh for Euro 5). 

Particulate matter: 0.01 g/kWh (0.02/0.03 depending on test cycle for Euro 5). 

Particulate count: 6.00 x 1011 particles/kWh (transient test cycle). 

8.00 x 1011 particles/kWh (stationary test cycle). 

This amounts to 600 or 800 billion particles per kWh. One kWh corresponds to the energy consumed during approx. 30 seconds of driving for a 40-tonne (truck and trailer) combination at highway speed.  

How Scania achieves Euro 6 compliance  

The upstream NOx sensor, diesel oxidation catalyst (DOC), full-flow diesel particulate filter (DPF), AdBlue mixer, twin parallel SCR catalysts, ammonium slip catalyst (ASC) and downstream NOx sensor are all integrated in Scania’s Euro 6 specific compact silencer unit. The exhaust gas temperature is measured all the way up to the catalysts, and the pressure drop across the Diesel Particulate Filter is monitored to assess its status. 

Euro 6 vs Euro 5 emissions 

Euro 6 compliance requires emissions of Nitrogen Oxide to be reduced to one fifth of the Euro 5 permitted levels. A new element in Euro 6 emission testing is that the particles also need to be counted. There is no counting requirement for Euro 5, but the reduction in the number of particulates is likely to be around 99%.