Exhaust emission cleaning apparatus for removing e.g. nitrogen monoxide, from exhaust gas of e.g. diesel engine of hybrid vehicle, has cleaning device to carry-out reduction cleaning process, if behavior of cleaning fluid is stabilized

摘要

The apparatus has a reduction cleaning device (54) with a pair of electrodes (66a, 66b) to apply voltage at cleaning fluid (A) e.g. ammonia, stored in a storage device (46), where concentration of the nitrogen oxide absorbed by the cleaning fluid is reduced by enabling a flow of electric current between the electrodes. A stability determining unit i.e. electronic control unit (70), determines whether the behavior of the cleaning fluid is stabilized, and enables the reduction cleaning device to carry-out the reduction cleaning process, if the behavior of the cleaning fluid is stabilized.