Patent ID: 7428810
Filing Date: 2008-09-30
Classification: F01N,F02D,F02M,Y02T

Abstract:
1. A power source, comprising: at least one combustion chamber; an exhaust system fluidly connected to the at least one combustion chamber and configured to receive an exhaust-gas stream; a fuel source configured to supply fuel to the at least one combustion chamber; an additive supply device configured to supply a quantity of an ethanol additive to the at least one combustion chamber; a sensor configured to provide a signal based on a concentration associated with an uncombusted ethanol additive in the exhaust-gas stream; a selective reduction catalyst system catalyst fluidly connected to the exhaust system and configured to reduce a NOx level associated with the exhaust-gas stream in the presence of the uncombusted ethanol additive; and a controller configured to modify the quantity of the ethanol additive based on the signal such that the reduction of the NOx level in the presence of the selective reduction catalyst system catalyst is greater than 90 percent by weight.