Patent ID: 8393140
Filing Date: 2013-03-12
Classification: B01D,F01N,F02D,Y02A,Y02T

Abstract:
1. A method for operating an internal combustion engine coupled to a hybrid powertrain including non-fuel torque generative devices operatively coupled to an energy storage device, comprising: controlling the engine to an ammonia producing air/fuel ratio to generate an engine-out exhaust gas feedstream including ammonia producing concentrations of nitric oxide, carbon monoxide, and hydrogen; converting the nitric oxide, carbon monoxide, and hydrogen to ammonia across a first catalytic device; storing the ammonia on an ammonia-selective catalytic reduction device fluidly serially connected downstream of the first catalytic device; and recovering an excess engine torque exceeding a required output torque using the non-fuel torque generative devices to convert the excess engine torque for storage in the energy storage device.