Patent ID: 8650860

Claim:
A power system, comprising: a hybrid engine configured to produce an exhaust gas stream; a generator operably coupled to the hybrid engine and configured to supply electrical power to a battery; a selective catalytic reduction (SCR) catalyst configured to receive the exhaust gas stream; a heater configured to heat the SCR catalyst; and a controller operably connected to the generator and the heater, wherein the controller is configured to: receive a signal representative of a temperature associated with the SCR catalyst and a signal representative of a power level of the battery, and to control the heater and the generator based at least in part on the temperature associated with the SCR catalyst and the power level of the battery, wherein controlling the generator based at least in part on the temperature associated with the SCR catalyst includes: loading the hybrid engine with the generator, in response to the power level of the battery being below a predefined threshold, to heat the exhaust gas stream, and maintaining the temperature associated with the SCR catalyst within a predefined range via the heated exhaust gas stream while the power level of the battery is below the predefined threshold.