Patent ID: 8763366
Filing Date: 2014-07-01
Classification: B01D,F01N,F02B,F02D,Y02T

Abstract:
1. A method for operating an air-compressing fuel-injection internal combustion engine having an exhaust gas post-treatment system that includes a particle filter and a nitrogen oxide reduction catalytic converter, said method comprising: providing for a plurality of internal combustion engine operating settings with respective predefined values for predefined internal combustion engine operating parameters; when the internal combustion engine is warming up, setting a heating operating setting, wherein when the heating operating setting is active and a temperature in the exhaust gas post-treatment system exceeds a predefinable second threshold value, a separate fuel post-injection is activated; when the temperature in the exhaust gas post-treatment system exceeds a predefinable first threshold value and the internal combustion engine is in a warmed-up state, changing from the heating operating setting to a basic operating setting and enabling addition of a reducing agent into the exhaust gas post-treatment system downstream of the particle filter and upstream of the nitrogen oxide reduction catalytic converter; wherein in the basic operating setting an exhaust gas recirculation rate is set that is higher compared to the heating operating setting; wherein in the basic operating setting a start of a main injection of fuel into cylinders of the internal combustion engine is set earlier compared to the heating operating setting; and wherein the internal combustion engine is operated with a compression ratio of less than 19:1 in the basic operating setting and in the heating operating setting.