| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for controlling DPF regeneration precisely determining regeneration timing by performing a pretreatment for eliminating a difference in the amount of SOF causing a dispersion in differential pressure before determining differential pressure between the front and rear of a DPF. <P>SOLUTION: Time from completion of the DPF regeneration to the next DPF regeneration is counted, the inlet temperature of the DPF during the time is detected, and SOF time (t<SB>L1-n</SB>) when the inlet temperature of the DPF is lower than temperature (T<SB>SOF</SB>) produced in PM by the SOF after the completion of the DPF regeneration is integrated. When the differential pressure between the front and rear of the DPF is equal to or higher than an upper limit, pretreatment time (t) for keeping the temperature of the DPF at the SOF temperature (T<SB>SOF</SB>) or higher is determined according to SOF integration time (t<SB>L</SB>), and the SOF is oxidized and removed under a pretreatment condition. After an appropriate time, the differential pressure between the front and rear of the DPF with a ratio of soot increased is detected. When the differential pressure is equal to or higher than the upper limit, the soot in the DPF is oxidized and removed to thereby regenerate the DPF. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
