Co-acting of fuel supply cut-off technique and oxidation catalyst in order to emission reduction from diesel engine

Within carried out investigations operation of compression-ignition engines was analysed in respect of toxic substances emission. The tested engines are used among other things as a drive of mining locomotives and city buses, so experiments were aimed at verifying if the engines meet very strict mining emission standards. In the paper, a method of considerable carbon monoxide emission reduction in the whole operation range of the diesel engine is presented. Proposed conception consists in co-acting of fuel supply cut-off technique and oxidation catalytic converter. Cutting-off fuel supply to selected cylinders of the engine (disconnection of the cylinders) is applied at low as well as mean loads and catalyst works effectively in the range of high loads. The paper contains experimental results of the modified diesel engine in which cylinders disconnection method and oxidation catalyst are commonly applied.