| 摘要 |
<p>A method for detecting the pressure difference across a DPF and a device for detecting the pressure difference across the DPF accurately determine the timing of the regeneration on the basis of the amount of accumulation of PM. When the vehicle is in a state in which there is no fuel supply to the internal combustion engine (10), the exhaust pipe (2) is closed at a position upstream of a DPF (3), the exhaust gas is bypassed to a position downstream of the DPF (3) from a position upstream of the position at which the exhaust pipe (2) is closed, air is caused to flow from a positive pressure pump (6) to a position between the DPF (3) and the position at which the exhaust pipe (2) is closed, and the pressure difference across the DPF (3) is detected.</p> |
