Patent ID: 8527186
Filing Date: 2013-09-03
Classification: F02D,Y02T

Abstract:
1. A computer-implemented method for correcting a deviation between a predicted gas excess air ratio and an actual gas excess air ratio in a compression ignited gaseous fueled engine, comprising: (A) using at least one programmed computer, predicting a gas excess air ratio fix the engine based on at least one detected current engine operating parameter; (B) using the at least one programmed computer, calculating a predicted exhaust gas oxygen concentration value based at least in part on the predicted gas excess air ratio; (C) using the at least one programmed computer, measuring an exhaust gas oxygen concentration using an oxygen sensor coupled to the compression ignited gaseous fueled engine; (D) using at least one time-based factor, filtering, via the at least one programmed computer, a plurality of the measured exhaust oxygen concentration measurements and a plurality of the predicted exhaust oxygen concentrations to obtain a filtered measured exhaust gas concentration value and a filtered predicted exhaust oxygen concentration value; (E) using the at least one programmed computer, comparing the filtered measured exhaust oxygen concentration value to the filtered predicted exhaust gas oxygen concentration value to determine an exhaust gas oxygen concentration deviation value; and (F) using the at least one programmed computer, calculating a corrected gas excess air ratio if the deviation exceeds a designated threshold.