| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent load of an engine from increasing and improve efficiency in driving an working machine when DPF is regenerated by burning PM. <P>SOLUTION: In step S10, if it is determined that a pressure differential ΔPF between before/after DPF 53 is higher than a differential pressure upper limit ΔPFH at which an DPF 53 is to be regenerated because PM is captured by the DPF 53, then, in step S12, a rotation number ΔN is added to a target fan rotation number Nf2 selected in a minimum value selection part 21g, to thereby calculate another target fan rotation number NfS which is larger than the target fan rotation number Nf2. A motor/generator 15 then rotates an electric fan 31 at the target fan rotation number NfS. <P>COPYRIGHT: (C)2012,JPO&INPIT |
