ANALYSIS AND COMPARISON EXHAUST GAS EMISSIONS FROM AGRICULTURAL TRACTORS

ABSTRACT : Emissions of a specific tractor engine mainly depend on engine speed. Various driving methods and use of implements with different work capacities can affect the engine load. This study deals with the effects of types of tractors and operation conditions on engine emission. In this study two types of agricultural tractors (MF285 and U650) and some tillage implements were employed. Some of the exhausted gases from both tractors in each condition were measured such as, hydrocarbon (HC), carbon monoxide (CO), carbon dioxide (CO 2 ), oxygen (O ) and nitrogen oxide (NO). Engine oil temperature was measured at every step for both types of tractors. A general conclusion of the work was that, using various implements and employing different types of tractors can affect some of engine emissions. The results of variance analysis showed all exhausted gases had a significant relationship with types of implements used at 1%. Also, all exhausted gases except CO had a significant relationship with types of tractors. A further conclusion was that NO emission increased as engine oil temperature increased. In addition, results showed that values of exhausted HC and O 2 in MF285 were lower than U650. While, the other exhausted gases (CO, CO 2 2 , and NO) in MF285 were higher than U650.The final conclusion was about the difference between MF285 and U650; using U650 at operation conditions is better than MF285 in terms of pollution.