A reducing agent supplying device includes a reaction container, an ozone generator, an air pump, an ozone-containing air pipe, a compressed air pipe, a switching device, and a switching controller. The reaction container defines a reaction chamber therein in which a reducing agent is reformed. The
A reducing agent supplying device includes a reaction container, an ozone generator, an air pump, an ozone-containing air pipe, a compressed air pipe, a switching device, and a switching controller. The reaction container defines a reaction chamber therein in which a reducing agent is reformed. The ozone generator generates ozone from oxygen in air. The air pump supplies air into the ozone generator. An ozone-containing air flows through the ozone-containing air pipe toward the reaction chamber. A portion of a compressed air flows through the compressed air pipe toward the reaction chamber. The switching device switches between an air pump mode, in which the ozone-containing air is supplied into the reaction chamber, and a supercharging mode, in which the compressed air is supplied into the reaction chamber. The switching controller controls the switching device based on a catalyst temperature, which is a temperature of the reducing catalyst, and an exhaust pressure, which is a pressure in the exhaust passage.
대표청구항▼
1. A reducing agent supplying device for a fuel combustion system, the fuel combustion system including a supercharger, which compresses an air and supplies the air to an internal combustion engine, and a NOx purifying device, which is arranged in an exhaust passage to purify, with a reducing cataly
1. A reducing agent supplying device for a fuel combustion system, the fuel combustion system including a supercharger, which compresses an air and supplies the air to an internal combustion engine, and a NOx purifying device, which is arranged in an exhaust passage to purify, with a reducing catalyst, NOx contained in exhaust gas of the internal combustion engine, the reducing agent supplying device supplying a reducing agent into the exhaust passage at a position upstream of the reducing catalyst, the reducing agent supplying device comprising: a reaction container that defines a reaction chamber therein in which the reducing agent is reformed by being oxidized with oxygen in air;an ozone generator that generates ozone from oxygen in air;an air pump that supplies the air into the ozone generator;an ozone-containing air pipe through which an ozone-containing air, which is an air containing the ozone generated by the ozone generator, flows toward the reaction chamber;a compressed air pipe through which a portion of a compressed air, which is the air compressed by the supercharger, flows toward the reaction chamber;a switching device that switches between an air pump mode, in which the ozone-containing air is supplied into the reaction chamber, and a supercharging mode, in which the compressed air is supplied into the reaction chamber; anda switching controller that controls the switching device based on a catalyst temperature, which is a temperature of the reducing catalyst, and an exhaust pressure, which is a pressure in the exhaust passage. 2. The reducing agent supplying device according to claim 1, further comprising a reducibility determiner that determines, based on the catalyst temperature, whether an reducible state exists where a reduction of the NOx is possible with the reducing catalyst,a first ozone-request determiner that determines, based on the catalyst temperature, whether a first ozone-requested state exists where supply of the ozone-containing air to the reaction chamber is requested during the reducible state, anda first air-pump-effectiveness determiner that determines, based on the exhaust pressure, whether a first low exhaust pressure state where supply of the reducing agent into the exhaust passage by the air pump is possible, whereinthe switching controller controls the switching device to switch to the air pump mode when the reducibility determiner determines that the reducible state exists, the first ozone-request determiner determines that the first ozone-requested state exists, and the first air-pump-effectiveness determiner determines that the first low exhaust pressure state exists. 3. The reducing agent supplying device according to claim 2, wherein the switching controller controls the switching device to switch to the supercharging mode when the reducibility determiner determines that the reducible state exists, the first ozone-request determiner determines that the first ozone-requested state exists, and the first air-pump-effectiveness determiner determines that the first low exhaust pressure state does not exist. 4. The reducing agent supplying device according to claim 2, wherein the switching controller controls the switching device to switch to the supercharging mode when the reducibility determiner determines that the reducible state exists and the first ozone-request determiner determines that the first ozone-requested state does not exist. 5. The reducing agent supplying device according to claim 1, further comprising an adsorbability determiner that determines, based on the catalyst temperature, whether an adsorbable state exists where adsorption of the NOx in the reducing catalyst is possible,a second ozone-request determiner that determines, based on the catalyst temperature, whether a second ozone-requested state exists where supply of the ozone-containing air into the exhaust passage is requested during the adsorbable state, anda second air-pump-effectiveness determiner that determines, based on the exhaust pressure, whether a second low exhaust pressure state exists where the supply of the ozone-containing air into the exhaust passage by the air pump is possible, whereinthe switching controller controls the switching device to switch to the air pump mode when the adsorbability determiner determines that the adsorbable state exists, the second ozone-request determiner determines that the second ozone-requested state exists, and the second air-pump-effectiveness determiner determines that the second low exhaust pressure state exists.
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이 특허에 인용된 특허 (6)
Cho,Byong K.; Olson,Keith L., Continuous reforming of diesel fuel for NOx reduction.
Price,Kenneth S.; Bonadies,Joseph V.; Kirwan,John E.; Goulette,David Alexander, Method and apparatus for delivery of supplemental material to an exhaust gas feedstream with supplemental air assistance.
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