Nitrogen oxygen conversion device that motor vehicle exhaust detected

The utility model relates to a vehicle exhaust detection device. Nitrogen oxygen conversion device that motor vehicle exhaust detected, the device be including preheating barrel, lagging casing, reacting chamber and end cover, preheats the barrel setting in the lagging casing, and the side parcel that preheats the barrel is provided with the cotton material that keeps warm, and both ends establish that put the heat insulating mattress respectively and the lagging casing is thermal -insulated sets up, a tip that preheats the barrel is provided with air inlet and gas outlet, and the air inlet connection is provided with preheats the air flue of ventilating, preheats barrel inside and still sets up the installation mesopore, and it is downthehole in the installation that the setting is installed to the reacting chamber, and the packing is provided with reducing catalyst in the reacting chamber, and the venthole of reacting chamber feeds through the gas outlet of preheating the barrel, and the inlet port of react