THE ANALYSIS OF THE OPERATING CONDITIONS OF FARM MACHINERY ENGINES IN REGARD TO EXHAUST EMISSIONS LEGISLATION

An analysis was conducted of actual operating conditions of farm machine engines with respect to currently applicable tests. The tests were performed on a farm tractor, farm harvester, and self-propelled forage harvester. Results of, the investigations and analyses related to operating conditions of the said engines while operating in the field. An analysis was performed in which ranges of the most frequently used engine speeds and loads were determined. In addition, select results of the exhaust emissions measured under actual operating conditions of the farm machinery are presented A PEMS (Portable Emissions Measurement System) equipment was used for the tests, and the emission of NO,, (Nitric Oxides) and PM (Particulate Matter). NO,, and PM are key pollutants in diesel engines as indicated by results. Conclusions following the comparison of the actual operating conditions with the NRSC (Non-Road Stationary Cycle) and NRTC (Non-Road Transient Cycle) research cycles indicate that the measurement range in the American NTE test seems too wide in the context of the obtained results. The obtained results force a discussion related to the necessity of modijiing the applicable test procedures.