Validation of Procedures for Market Screening of Non-Road Machines

For the precedent project “In-Service Monitoring of Non-Road Mobile Machinery”, supplementary activities in the given project have been performed. The aim of the present project was to give an extended validation of the proposed procedure for market screening of non-road machines.
The same machine and agricultural processes were transferred from the field application into a re-producible test bench, for the validation of the process without environmental influence.
The present report demonstrates the reproducibility of the agricultural cycles and maneuvers on the test bench. The reliability on results of field and test bench measurements were discussed from the point of emission standards. The same tractor, as in the former project, was used to avoid differences in the results due to manufacturing.
The important conclusions are:
For the cycles:
• Measured cycles from the field test can be transferred very well. When sufficient data is recorded.
• For the used tractor class, the DLG standard cycles are representative and comparable with the field measurements.
• Other agricultural machines of a different type and performance class should be examined to see whether the cycles are also representative here.
For the tractor:
• Heating the exhaust gas after treatment in idle is not to recommended.
• The powertrain of the tractor allows to maintain engine speed in a constant range, even when tractor velocity changes.
• When performing tasks under full load the tractor has very low emissions
• Implemented right, the OBD signals are sufficient to obtain the performed work of the engine
For the procedure:
• Cycles measured in the field can be transferred effortless
• The deviation in results between field and dynamometer are small
• The “DLG” standard cycles represent the intend task very well.
• The performed cycles on dynamometer are reproducible as expected.
Further research topics are proposed. Some of them are:
• Testing other tractor applications for statistical hedging.
• Extension of this research field to other types of machines and processes.
• Further analysis for a universal load-speed cycle for PTI procedures.
• Contacts and exchange of experiences with JRC ERMES, with other research institutes and with manufacturers.