Patent ID: 8341943
Filing Date: 2013-01-01
Classification: F01N,F02D,Y02A,Y02T

Abstract:
1. An exhaust gas purification method for performing a regeneration control for a NOx purification catalyst of an exhaust gas purification system provided in an internal combustion engine mounted on a vehicle, comprising: providing the regeneration control to include a fuel system rich control, and an air-intake system rich control; determining whether the vehicle is decelerating, when it is determined that the vehicle is not decelerating, the regeneration control is not performed, when it is determined that the vehicle is decelerating, determining whether the regeneration control is necessary, and when it is determined that the vehicle is decelerating and the regeneration control is necessary, the regeneration control is performed, including air intake throttling and exhaust throttling; and detecting a NOx catalyst temperature index temperature, wherein, when it is determined that the vehicle is decelerating and if the detected NOx catalyst temperature index temperature is not less than a regeneration capability temperature, increasing the air-intake throttling.