Apparatus for distributing back pressure and control method for distributing the back pressureat in exhaust system

摘要

The present invention relates to a technology capable of securing NOx purification efficiency while minimizing back pressure loss of an exhaust system. In the present invention, a plurality of exhaust purification devices are sequentially provided along an exhaust line, and a reducing agent is injected to reduce NOx. ; a temperature sensor detecting a temperature of the exhaust purification device; a mixer provided to disperse the reducing agent at the front end of the exhaust purification device and to adjust the cross-sectional area of the dispersion passage; a back pressure regulator provided at the rear end of the exhaust purification device to be operable to open and close and adjust the back pressure; and a controller for controlling the NOx purification efficiency and back pressure of the exhaust purification device by adjusting the opening amount of the back pressure regulator according to the cross-sectional area of the distribution passage of the mixer and the temperature of the exhaust purification device; and A back pressure distribution control method is introduced.