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.