Patent ID: 6829889
Filing Date: 2004-12-14
Classification: F01N,F02D,Y02T

Abstract:
An exhaust gas cleaning device for an internal combustion engine having a particulate filter provided in an exhaust path for capturing fine exhaust particles, comprising:differential pressure detecting means for detecting a differential pressure between pressure at an inlet side and pressure at an outlet side of said particulate filter; flow velocity detecting means for detecting a flow velocity of an exhaust gas flowing through said particulate filter; and recycling determining means for determining whether or not to recycle said particulate filter according to a determination formula that determines a value of a deposited quantity of fine exhaust particles in said particulate filter based on the detected differential pressure and flow velocity, wherein said determination formula is equivalent to formula: &Dgr;P&gE;M&mgr;v+N&rgr;v2, wherein &Dgr;P is said differential pressure, v is said flow velocity, &mgr; is a viscosity of the exhaust gas distributed in said particulate filter, &rgr; is a density of said exhaust gas, and M and N are constants, and said particulate filter is permitted to be recycled when said determination formula is satisfied.