Patent ID: 8596115

Claim:
A corrected exhaust gas pressure loss calculation device comprising an engine whose exhaust passage comprises a filter which collects microparticles contained in an exhaust gas, a calculating unit which calculates a corrected exhaust gas pressure loss serving as an exhaust gas pressure loss under a predetermined reference condition in the exhaust passage, the corrected exhaust gas pressure loss calculation device comprising: an exhaust gas pressure measuring unit which measures an exhaust gas pressure in the exhaust passage; an exhaust gas mass flow rate measuring unit which measures an exhaust gas mass flow rate in the exhaust passage; and an exhaust gas temperature measuring unit which measures an exhaust gas temperature in the exhaust passage, wherein the calculating unit converts the exhaust gas pressure into a corrected exhaust gas pressure loss serving as the exhaust gas pressure loss under the reference condition from: a relationship between the exhaust gas mass flow rate and an exhaust gas mass flow rate under the reference condition; a relationship between the exhaust gas temperature and an exhaust gas temperature under the reference condition; a relationship between the exhaust gas pressure and an exhaust gas pressure under the reference condition; and a relationship between an exhaust gas viscosity coefficient under a condition of the exhaust gas temperature and a viscosity coefficient of a viscous gas under the reference condition.