Device for purifying exhaust gas of engine
First Claim
1. A device for purifying the exhaust gas of an engine having an exhaust passage, comprising:
- a sulphur containing components absorbent arranged in the exhaust passage, the sulphur containing components absorbent absorbing the sulphur containing components therein when the air-fuel ratio of the inflowing exhaust gas is lean, and releasing the absorbed sulphur containing components therefrom when the oxygen concentration in the inflowing exhaust gas becomes lower with the temperature of the sulphur containing components absorbent being higher than a sulphur containing components releasing temperature of the sulphur containing components absorbent; and
releasing means for making the air-fuel ratio of the exhaust gas flowing to the sulphur containing components absorbent stoichiometric or rich temporarily, when the temperature of the sulphur containing components absorbent is higher than the sulphur containing components releasing temperature and when the flow rate of the exhaust gas flowing through the sulphur containing components absorbent is lower than a predetermined flow rate, to release the absorbed sulphur containing components from the sulphur containing components absorbent.
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Accused Products
Abstract
A device for purifying the exhaust gas of an engine comprises a NOX absorbent arranged in the exhaust passage. The NOX absorbent absorbs NOX therein when the air-fuel ratio of the inflowing exhaust gas is lean, and releases the absorbed NOX therefrom when the oxygen concentration in the inflowing exhaust gas becomes lower. The NOX absorbent also absorbs SOX therein when the air-fuel ratio of the inflowing exhaust gas is lean, and releases the absorbed SOX therefrom when the oxygen concentration in the inflowing exhaust gas becomes lower, with the temperature of the NOX absorbent being higher than a SOX releasing temperature. The air-fuel ratio of the exhaust gas flowing to the NOX absorbent is made rich temporarily when the temperature of the NOX absorbent is higher than SOX releasing temperature and when the flow rate of the exhaust gas flowing through the NOX absorbent is lower than a predetermined flow rate, to release the absorbed SOX from the NOX absorbent.
156 Citations
25 Claims
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1. A device for purifying the exhaust gas of an engine having an exhaust passage, comprising:
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a sulphur containing components absorbent arranged in the exhaust passage, the sulphur containing components absorbent absorbing the sulphur containing components therein when the air-fuel ratio of the inflowing exhaust gas is lean, and releasing the absorbed sulphur containing components therefrom when the oxygen concentration in the inflowing exhaust gas becomes lower with the temperature of the sulphur containing components absorbent being higher than a sulphur containing components releasing temperature of the sulphur containing components absorbent; and releasing means for making the air-fuel ratio of the exhaust gas flowing to the sulphur containing components absorbent stoichiometric or rich temporarily, when the temperature of the sulphur containing components absorbent is higher than the sulphur containing components releasing temperature and when the flow rate of the exhaust gas flowing through the sulphur containing components absorbent is lower than a predetermined flow rate, to release the absorbed sulphur containing components from the sulphur containing components absorbent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification