Transferring agricultural machines from field to the laboratory for emission check

Mobile machines are very versatile and different in their design and in the tasks they can
handle. Tractors for example can be combined with different implements to work in agricultural
processes. This variety must be considered during development, testing and inspection of
exhaust gas aftertreatment systems. In this paper, one approach conducts In-Use
measurements during field operation of a tractor with implement. While this takes
environmental influences into account, In-Use measurements are barely reproducible,
although tests on a chassis dynamometer are highly reproducible. Known road load simulation
techniques for cars are not transferrable for mobile machines on chassis dynamometers due
to different drivetrain topologies and changing parameters during field operation. To transfer
field measurements to the roller test bench in the laboratory, a method is proposed to control
the vehicle speed and motor torque to the same values recorded in the field.