Patent ID: 8561393
Filing Date: 2013-10-22
Classification: F01N,Y02T

Abstract:
1. A method of determining if an oxidation catalyst of an exhaust gas treatment system is quenched or is not quenched, the method comprising: injecting hydrocarbons at an injection rate into a flow of exhaust gas upstream of the oxidation catalyst when the temperature of the oxidation catalyst is equal to or greater than a light-off temperature of the oxidation catalyst; increasing the injection rate at an acceleration rate; sensing an upstream temperature of the exhaust gas upstream of the oxidation catalyst; sensing a downstream temperature of the exhaust gas downstream of the oxidation catalyst; determining that the oxidation catalyst is not quenched when the sensed downstream temperature of the exhaust gas is greater than the sensed upstream temperature of the exhaust gas as the hydrocarbon injection rate increases, and when the sensed downstream temperature of the exhaust gas increases over time as the hydrocarbon injection rate increases; and determining that the oxidation catalyst is quenched when the sensed downstream temperature of the exhaust gas is equal to or less than the upstream temperature of the exhaust gas as the hydrocarbon injection rate increases.