To clean the exhaust emissions as one of the most important tasks in pollutioncontrol,a study on the treatment of engine emissions with discharge assistance was reported.ADBD plasma source shaped in grid and cylinder was examined in different engine operationalmodes to reduce the NO_x content of diesel engine exhaust.The composition of the exhaustgases and chemical reactions initiated by the discharge were analyzed.The discharge h'equencyhad a crucial impact on the device's performance and gas treatment.The voltages applied tothe discharge gap could alter the chemical reactions occurring in the treated gases,which wereindicated by the NO to NO_2 ratio.The operation of the system was studied at frequencies rangingfrom 400 Hz to 16 kHz.
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