Exhaust gas after-treatment device e.g. nitrogen oxide catcher, operation controlling method for internal combustion engine, involves comparing concentration reference value and temperature reference value with calibration threshold value

摘要

The method involves determining a concentration reference value of oxygen concentration in an upstream part of an exhaust gas after-treatment device corresponding to highest temperature. A temperature reference value of exhaust temperature of the exhaust gas after-treatment device is determined corresponding to highest temperature based on a thermal mode of the exhaust gas after-treatment device. The concentration reference value and the temperature reference value are compared with a calibration threshold value under multiple situations to trigger protection mode. An independent claim is also included for a device for controlling operation of an exhaust gas after-treatment device of an internal combustion engine.