| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device of an internal combustion engine capable of quickly reducing the oxygen concentration, by setting a target value for reducing oxygen low by learning a variation possessed by a device constitution, in the exhaust emission control device for restraining an excessive temperature rise by reducing the oxygen concentration, after being determined as having the possibility of the excessive temperature rise in a DPF. SOLUTION: The oxygen concentration in exhaust gas flowing in the DPF in two stages, is reduced on and after the time t0 of detecting the possibility of causing the excessive temperature rise in the DPF. By learning the variation possessed by the device constitution in advance, the oxygen concentration is quickly reduced by setting a target value T1' lower than a target value T1 in a conventional technology in a first stage of quickly reducing the oxygen concentration. Afterwards, the value is converged to the final target value T2 by feedback control. A setting time up to reaching the target value T2 can be shortened in a learning existing case more than a learning nonexistent case. COPYRIGHT: (C)2010,JPO&INPIT |
