Exhaust purifying apparatus and method for internal combustion engine
First Claim
1. An exhaust purifying apparatus for an internal combustion engine, the exhaust purifying apparatus comprising:
- a catalyst that purifies exhaust gas emitted from the internal combustion engine;
a first passage disposed between the engine and the catalyst to allow exhaust gas to flow therethrough from the engine to the catalyst, said first passage including an accelerated cooling portion having a cross section that permits a first quantity of heat to be released from the exhaust gas in the first passage;
a second passage disposed between the engine and the catalyst to allow exhaust gas to flow therethrough from the engine to the catalyst, said second passage having a cross section that permits a second quantity of heat that is smaller than said first quantity of heat to be released from the exhaust gas in the second passage; and
a flow amount controller that controls amounts of exhaust gas flowing through the first passage and through the second passage, such that;
(i) the amount of exhaust gas flowing through the first passage is made larger than the amount of exhaust gas flowing through the second passage when a temperature of exhaust gas emitted from the engine is to be lowered by a relatively large degree before the exhaust gas flows into the catalyst, and (ii) the amount of exhaust gas flowing through the second passage is made larger than the amount of exhaust gas flowing through the first passage when the temperature of exhaust gas emitted from the engine is to be lowered by a relatively small degree before the exhaust gas flows into the catalyst.
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Accused Products
Abstract
An exhaust purifying apparatus for an internal combustion engine includes a catalyst that purifies exhaust gas from the engine, a first passage that allows exhaust gas to flow from the engine to the catalyst, and a second passage that allows exhaust gas to flow from the engine to the catalyst. The first passage includes an accelerated cooling portion whose cross section is designed so that a relatively large quantity of heat is released from the exhaust gas in the first passage, and the second passage has a cross section designed so that a relatively small quantity of heat is released from the exhaust gas in the second passage. The apparatus further includes a flow amount controller that controls amounts of exhaust gas flowing through the first and second passages, such that the amount of exhaust gas flow through the first passage is made larger than that through the second passage when the temperature of exhaust gas emitted from the engine is to be lowered by a relatively large degree before reaching the catalyst, and such that the amount of exhaust gas flow through the second passage is made larger than that through the first passage when the temperature of exhaust gas emitted from the engine is to be lowered by a relatively small degree before reaching the catalyst.
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Citations
31 Claims
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1. An exhaust purifying apparatus for an internal combustion engine, the exhaust purifying apparatus comprising:
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a catalyst that purifies exhaust gas emitted from the internal combustion engine;
a first passage disposed between the engine and the catalyst to allow exhaust gas to flow therethrough from the engine to the catalyst, said first passage including an accelerated cooling portion having a cross section that permits a first quantity of heat to be released from the exhaust gas in the first passage;
a second passage disposed between the engine and the catalyst to allow exhaust gas to flow therethrough from the engine to the catalyst, said second passage having a cross section that permits a second quantity of heat that is smaller than said first quantity of heat to be released from the exhaust gas in the second passage; and
a flow amount controller that controls amounts of exhaust gas flowing through the first passage and through the second passage, such that;
(i) the amount of exhaust gas flowing through the first passage is made larger than the amount of exhaust gas flowing through the second passage when a temperature of exhaust gas emitted from the engine is to be lowered by a relatively large degree before the exhaust gas flows into the catalyst, and (ii) the amount of exhaust gas flowing through the second passage is made larger than the amount of exhaust gas flowing through the first passage when the temperature of exhaust gas emitted from the engine is to be lowered by a relatively small degree before the exhaust gas flows into the catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of purifying exhaust emitted from an internal combustion engine by utilizing a catalyst that purifies exhaust gas emitted from the internal combustion engine, the method comprising:
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disposing a first passage between the engine and the catalyst to allow exhaust gas to flow through the first passage from the engine to the catalyst, the first passage including an accelerated cooling portion having a cross section that permits a first quantity of heat to be released from the exhaust gas in the first passage;
disposing a second passage between the engine and the catalyst to allow exhaust gas to flow through the second passage from the engine to the catalyst, the second passage having a cross section that permits a second quantity of heat that is smaller than the first quantity of heat to be released from the exhaust gas in the second passage; and
controlling amounts of exhaust gas flowing through the first passage and through the second passage, including;
(i) making the amount of exhaust gas flowing through the first passage larger than the amount of exhaust gas flowing through the second passage when a temperature of exhaust gas emitted from the engine is to be lowered by a relatively large degree before the exhaust gas flows into the catalyst, and (ii) making the amount of exhaust gas flowing through the second passage larger than the amount of exhaust gas flowing through the first passage when the temperature of exhaust gas emitted from the engine is to be lowered by a relatively small degree before the exhaust gas flows into the catalyst. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification