| 主权项 |
1. A reducing agent supplying device for a fuel combustion system that includes a NOx purifying device with a reducing catalyst arranged in an exhaust passage to purify NOx contained in exhaust gas of an 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 has a reaction chamber therein in which fuel of a hydrocarbon compound is mixed with air and is oxidized with oxygen in the air; a computer, comprising a processor, the computer being configured to:
perform an equivalent ratio control that adjusts an equivalent ratio of the fuel to air inside the reaction chamber to be within a specified equivalent ratio range;perform a temperature control that adjusts a temperature inside the reaction chamber to be within a specified temperature range; andchange a target equivalent ratio, which is a target value of the equivalent ratio, according to the temperature inside the reaction chamber, wherein the specified equivalent ratio range and the specified temperature range are set such that a cool flame reaction, through which the fuel inside the reaction chamber is partially oxidized with oxygen, is generated, and the fuel that is partially oxidized through the cool flame reaction is used as the reducing agent. |
