| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control system wherein control ranging from travelling automatic regeneration to idle automatic regeneration during stop can be precisely performed, and even if a shift from the idle automatic regeneration to the travelling automatic regeneration is made, overshoot of the exhaust gas temperature is prevented. <P>SOLUTION: The exhaust emission control system in which a DPD 25 for trapping PM in exhaust gas is connected to an exhaust pipe 20 of a diesel engine 10, and when the quantity of PM in the DPD 25 reaches a given quantity or more, the exhaust gas temperature of the diesel engine 10 is increased by exhaust pipe injection to automatically regenerate the DPD. In the exhaust emission control system, the exhaust gas temperature during DPD regeneration in the automatic regeneration is detected, a deviation between the detected exhaust gas temperature and a target regeneration temperature is found, and when a shift from traveling automatic regeneration to idle automatic regeneration due to a stop is made when the exhaust pipe injection quantity is PID controlled on the basis of the deviation, the integral control term in the PID control is reset to zero to control the exhaust pipe injection quantity. <P>COPYRIGHT: (C)2012,JPO&INPIT |
