| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device of a diesel engine, which can shorten regeneration time while raising a DPF (diesel particulate filter) temperature so as to reduce an oil dilution amount in forced regeneration of the DPF and can suppress a risk of excessive temperature rise of the DPF. <P>SOLUTION: A DPF target temperature setting means has a temperature rise rate setting unit setting in such a manner that the change rate of temperature rise decreases with temperature rise or with the lapse of time after starting late-post injection, up to a target set temperature at which PM (particulate matter) combusts after starting the late-post injection. The change rate of stepwise temperature rise in the temperature rise rate setting unit is configured by two stages of a first stage change rate A and a second stage change rate B that is smaller than the first stage change rate A. The target temperature of the DPF temperature is calculated by using the temperature rise rate of the temperature rise rate setting unit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
