Patent ID: 8621845

Claim:
A thermal management system comprising: an enable module that enables generation of ammonia for use in selective catalytic reduction (SCR) catalysts of an exhaust system during a passive SCR mode; a status module that determines whether the exhaust system is operating in a passive SCR mode and generates a passive SCR active signal, wherein the passive SCR mode includes operating an engine with rich air/fuel ratios, and wherein the passive SCR active signal indicates whether the exhaust system is operating in the passive SCR mode; and a temperature control module that activates electrical heating of an oxidation catalyst downstream from the SCR catalysts based on the passive SCR active signal and a temperature of the oxidation catalyst, wherein the temperature control module performs the activation of the electrical heating of the oxidation catalyst to increase the temperature of the oxidation catalyst to a temperature greater than or equal to a light-off temperature of the oxidation catalyst.