Condensed water treatment device for internal combustion engine
First Claim
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1. A condensed water treatment device for an internal combustion engine, the condensed water treatment device being applied to the internal combustion engine comprising:
- a selective-reduction type NOx catalyst which is provided on an exhaust passage to reduce NOx and purify exhaust gas by ammonia; and
an additive supplying valve which supplies an additive which is ammonia or a precursor of ammonia to the exhaust passage at an upstream side of the NOx catalyst, the condensed water treatment device comprising;
a condensed water tank which stores condensed water generated in an exhaust system of the internal combustion engine;
a drainage passage which connects the condensed water tank and the exhaust passage;
a switching valve which switches a state of the drainage passage between close and open; and
a computer, by executing a computer program, functioning as a drainage controlling device which is configured to control the switching valve, so that the condensed water is drained to the exhaust passage via the drainage passage while the additive is being supplied to the exhaust passage via the additive supplying valve, whereinthe drainage controlling device is configured to;
obtain a storage water quantity of the condensed water tank;
determine whether the storage water quantity obtained is larger than a predetermined threshold value; and
in a case of determining that the storage water quantity is larger than the predetermined threshold value, control the switching valve so that the drainage passage is opened when the additive is supplied to the exhaust passage.
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Abstract
The condensed water treatment device obtains (S1) the storage water quantity (QW) of a condensed water tank, and drains (S4) condensed water in the condensed water tank when the storage water quantity (QW) is larger than a threshold value (tu) and also urea water is supplied to an exhaust passage for a selective-reduction type NOx catalyst. Thereby, the condensed water is neutralized and then drained to the outside of an internal combustion engine through the exhaust passage.
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9 Claims
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1. A condensed water treatment device for an internal combustion engine, the condensed water treatment device being applied to the internal combustion engine comprising:
- a selective-reduction type NOx catalyst which is provided on an exhaust passage to reduce NOx and purify exhaust gas by ammonia; and
an additive supplying valve which supplies an additive which is ammonia or a precursor of ammonia to the exhaust passage at an upstream side of the NOx catalyst, the condensed water treatment device comprising;a condensed water tank which stores condensed water generated in an exhaust system of the internal combustion engine; a drainage passage which connects the condensed water tank and the exhaust passage; a switching valve which switches a state of the drainage passage between close and open; and a computer, by executing a computer program, functioning as a drainage controlling device which is configured to control the switching valve, so that the condensed water is drained to the exhaust passage via the drainage passage while the additive is being supplied to the exhaust passage via the additive supplying valve, wherein the drainage controlling device is configured to; obtain a storage water quantity of the condensed water tank; determine whether the storage water quantity obtained is larger than a predetermined threshold value; and in a case of determining that the storage water quantity is larger than the predetermined threshold value, control the switching valve so that the drainage passage is opened when the additive is supplied to the exhaust passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a selective-reduction type NOx catalyst which is provided on an exhaust passage to reduce NOx and purify exhaust gas by ammonia; and
Specification