Exhaust gas purification apparatus
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorYoshifumi Kato
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Abstract
An exhaust gas purification apparatus includes an oxidation catalyst, a selective catalytic reduction catalyst, a first urea water supplying device, a second urea water supplying device and a controller. The oxidation catalyst oxidizes nitrogen monoxide to nitrogen dioxide. The selective catalytic reduction catalyst is disposed downstream of the oxidation catalyst. The first urea water supplying device is disposed upstream of the oxidation catalyst. The second urea water supplying device is disposed downstream of the oxidation catalyst and upstream of the selective catalytic reduction catalyst. The controller controls the supply of urea water to exhaust gas by the first urea water supplying device and the second urea water supplying device according to temperature of the exhaust gas.
Claims13
An exhaust gas purification apparatus comprising;
- an oxidation catalyst oxidizing nitrogen monoxide to nitrogen dioxide:
- a selective catalytic reduction catalyst disposed downstream of the oxidation catalyst;
- a first urea water supplying device disposed upstream of the oxidation catalyst;
- a second urea water supplying device disposed downstream of the oxidation catalyst and upstream of the selective catalytic reduction catalyst;
- a controller controlling the supply of urea water to exhaust gas by the first urea water supplying device and the second urea water supplying device according to temperature of the exhaust gas.
Dependencies are inferred from the claim text.