Rare combination

Volvo Bus Corporation introduced the D13 engine in the 9700 Coach, in 2009, to meet the Euro V emission legislation. In addition we introduced a new version of the I-Shift gear box. Before the launch we confirmed 3% fuel consumption improvement on our test coaches, relative to the corresponding coach with an Euro IV certified 12 litre engine. Still, it is always exciting to see the data from real traffic. We now have the results from the first six months and we are able to confirm the fuel consumption improvement.

In the average statistics for 9700 in Europe, in the picture below, I have selected data from the 9700 in the 6×2 version. The three axle, 6×2, coaches are mostly between 13.3 and 14.5 metre. The taller coaches are chosen for the high passenger capacity. A typical 12 metre coach takes just about 50 passengers while the 14.5 metre coach takes 64. It is an increase by almost 30% while the fuel consumption increase by 10% for the taller coach. It is thus a good deal for the environment to choose a large coach, provided that the increased capacity is used.

The simultaneous improvement of emissions and fuel consumption is a rare combination. When you ad the increased power of the D13 engine to the picture, the combination is unique.

 Let me also share some experiences from the B12B statistics from different regions. Again, the data is exclusively from 9700 with three axles, 6×2. You can see the positive influence of smooth but slow traffic flow in Denmark, the cost for the hot climate air conditioning and hilly roads in Spain, While Sweden and Germany have similar traffic fuel consumption when the same average speed is compared. The data is gathered from a large number of buses in daily operation in Europe.


About volvobuses

Adjunct Professor of Catalysis at Chalmers University of Technology. Lives in Gothenburg, Sweden, with my wife and three daughters born in 1991, 1994 and 1997. Is a passionate runner.
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