Patent ID: 8056405
Filing Date: 2011-11-15
Classification: F01N,G01N

Abstract:
1. A particulate matter concentration measuring apparatus configured to measure concentration of particulate matter in exhaust gas passing through an exhaust line of a diesel engine, the apparatus comprising: an exhaust gas collecting line branched from the exhaust line and having a cross-sectional area smaller than a cross-sectional area of the exhaust line; a particulate matter detection filter provided in the exhaust gas collecting line; a differential pressure sensor configured to sense differential pressure between an inlet and an outlet of the particulate matter detection filter; a passage wall disposed so that the exhaust gas flows to a downstream side of the particulate matter detection filter; an inlet side passage through which the exhaust gas flows into the particulate matter detection filter in the passage wall; and an outlet side passage through which the exhaust gas flows out from the particulate matter detection filter, wherein the outlet side passage defines a space having an outlet side cross-sectional area approximately 1.0 times or more larger than an inlet side cross-sectional area of a space defined by the inlet side passage, the outlet side cross-sectional area and the inlet side cross-sectional area being substantially perpendicular to a longitudinal axis of the particulate matter detection filter.