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The test section is equipped with two roller dynamometers.

dyno braking power circum- ferential speed max. force continuous operation / short-term front 300 kW @ 83 km/h 280 km/h 13 / 16 kN rear 450 kW @62 km/h 280 km/h 26 / 35 kN
performance data of the roller test bench	4-wheel dyno test bench

The diameter of the rollers is 2 m. Both can be moved longitudinally - even with the test vehicle - under push-button control, and the wheelbase set to between 2.3 and 6.9 m. The traction force and brake power ranges suit passenger cars and commercial vehicles respectively. Each dynamometer is equipped with two separate force measuring units for different working ranges.
	Schematic view of the four-wheel dynamometer

As well as steady-state operating points, with constant values for tractive force or speed, dynamic cycles can be driven, and coast-down tests can be performed.

The following modes are possible:
 

• constant force
   
• constant speed
   
• road simulation
  
  
  The determination of the roller parameters to set vehicle values will be done by Coast Down runs