Device and method of determining deterioration of catalyst
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorKiyoka Tsunekawa
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Abstract
A catalyst determining device includes an oxidation catalyst disposed in an outlet passage in an engine, the oxidation catalyst including an adsorption substance for adsorbing and desorbing an exhaust component in exhaust and a catalytic substance capable of oxidizing the exhaust component, a calculating unit for calculating a difference in oxygen concentration between upstream and downstream of the oxidation catalyst, and a determination unit for determining the deterioration of the oxidation catalyst through comparison of a plurality of the differences in oxygen concentration obtained at different temperatures of the oxidation catalyst by the calculating unit.
Claims9
A catalyst determining device comprising:
- an oxidation catalyst disposed in an outlet passage in an engine, the oxidation catalyst comprising an adsorption substance for adsorbing and desorbing an exhaust component in exhaust and a catalytic substance capable of oxidizing the exhaust component;
- a calculating unit for calculating a difference in oxygen concentration between upstream and downstream of the oxidation catalyst;
- and
- a determination unit for determining deterioration of the oxidation catalyst through comparison of a plurality of the differences in oxygen concentration obtained at different temperatures of the oxidation catalyst by calculating unit.
A method of determining deterioration of an oxidation catalyst disposed in an outlet passage in an engine, the oxidation catalyst including an adsorption substance for adsorbing and desorbing an exhaust component in exhaust and a catalytic substance capable of oxidizing the exhaust component, the method comprising:
- calculating a difference in oxygen concentration between upstream and downstream of the oxidation catalyst as a first difference in oxygen concentration if a temperature of the oxidation catalyst is a first temperature;
- calculating a difference in oxygen concentration between upstream and downstream of the oxidation catalyst as a second difference in oxygen concentration if the temperature of the oxidation catalyst is a second temperature higher than the first temperature;
- and
- performing the determination of deterioration of the oxidation catalyst by comparing the first difference in oxygen concentration with the second difference in oxygen concentration.
Dependencies are inferred from the claim text.