| 摘要 |
<p>An exhaust gas collecting performance determining method which is capable of detecting a particulate collecting performance in an exhaust gas by a filter unit provided in an exhaust system of an internal engine with good accuracy, and a device therefor, is provided. The exhaust gas collecting performance determining device 1 is equipped with a pressure difference detecting unit 17 which detects a before-after pressure difference ”Pdpf of the filter unit 3, a memory unit 21 which memorizes a predetermined number of the detected before-after pressure difference ”Pdpf detected by the pressure difference detecting unit 17 in each region of an operating region sectionalized into a plurality of regions by an operating condition dvol of an internal combustion engine 2, and a determining unit 22 which calculates a pressure difference characteristics of the filter unit 3 with respect to the operating state of the internal combustion engine 2, when the predetermined number of the before-after pressure difference ”Pdpf is stored in all of the region by the memory unit 21, on the basis of the relationship between the memorized before-after pressure difference ”Pdpf and the operating condition dvol at the time when each of the before-after pressure difference ”Pdpf is detected, and which determines that the existence or nonexistence of an abnormality of the filter unit 3 on the basis of the calculated pressure difference characteristics.</p> |
