Patent ID: 8776506
Filing Date: 2014-07-15
Classification: F01N,F02D,Y02T

Abstract:
1. A method for predicting a NOx amount, comprising: generating exhaust gas from an engine and passing the exhaust gas to an exhaust pipe; detecting an 02 amount in an intake air; determining a reference 02 amount in the intake air according to a driving condition of the engine; determining a reference NOx amount contained in the exhaust gas according to the driving condition of the engine; correcting the determined reference NOx amount based on the detected 02 amount in the intake air and the determined reference 02 amount in the intake air according to the driving condition of the engine; secondarily correcting the corrected reference NOx amount according to an environmental factor; and wherein the secondarily correcting of the corrected reference NOx amount according to the environmental factor includes determining a first correction coefficient according to a total air amount supplied into a combustion chamber of the engine, the engine speed, and the current fuel injection amount and correcting the corrected reference NOx amount according to the first correction coefficient.