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English   Mercedes-Benz Citaro with new Euro VI engines
01.10.2012 von admin


The electronically controlled air compressor previously used in the vertical-engine Citaro articulated bus is now fitted in all models in the range. The close-loop controlled air compressor is a two-level device, and therefore operates at significantly lower temperatures. It also works whenever possible in fuel economy mode, during an “overrun” phase. To ensure this is the case as often as possible, the system pressure for the suspension and door operation has been increased from 10 bar to 12 bar. This creates higher air reserves, and saves fuel. Rigid buses are fitted with a two-cylinder air compressor, and their articulated counterparts with a three-cylinder device.

The air processing unit (APU) is now electronically controlled. The unit combines an air dryer, pressure governor, four-circuit protection valve and pressure sensors in a single component. The APU and a parking heater are now fitted at the same location in all versions of the Citaro, simplifying servicing procedures.

Weight still the same, with every kilogram at a premium

In spite of the major addition of exhaust gas aftertreatment to the specification for Euro VI engines, the weight of the new Citaro remains largely unchanged, with no reduction in passenger numbers. According to seating and equipment options, the new Euro VI Citaro rigid bus therefore has capacity for up to 100 passengers.

With an eye on the increased weight involved in future compliance with Euro VI, numerous weight-saving measures were already incorporated in the redesigned Citaro introduced one year ago. To meet the Euro VI requirements, the rear of the Citaro has now been completely redesigned and weight-optimised, from the rear axle up. The changes to the rear axle segment alone resulted in a weight reduction of as much as 60 kg. The rear axle is designed for with high input torque levels, for engines with ratings of up to 1900 Nm.

Other weight-trimming measures included reducing the panel thickness of the steel wheel arches to 1.5 mm, without affecting strength characteristics. The new single-section roof made of glass-fibre-reinforced plastic (GRP) saves another 20 kg. Another new weight-optimised feature is the roof frame in the area section, and further weight savings of around 40 kg have been achieved with engine mounts made from aluminium.

Every kilogram was at a premium, as a wide range of detailed design features reveal. For example, the significantly lower consumption of AdBlue meant that the in-vehicle reserve tank volume could be cut from 38 to 21 litres, bringing significant weight savings. Another case in point was the open bearing frame for the radiator fan. This is now a single aluminium casting, resulting in less weight and increased manufacturing precision.

Body adjustment even more sensitive than before

The chassis of the Citaro – already recognised as an outstanding design – has also been further enhanced with some fine touches on the part of the developers. Placing the height sensors outside rather than inside the vehicle makes the body height adjustment process even more sensitive and unobtrusive than before. The optional chassis for poor roads, a combination of vehicle elevation and modified suspension/shock absorber settings, provides a higher ground clearance and increased approach and departure angles, creating the optimum chassis setting for intercity journeys on rough terrain.


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