Method and apparatus for controlling exhaust gas temperature using unburned hydrocarbon prediction modelling

摘要

This invention relates to a technology for stably controlling the internal temperature of a catalyst by predicting the amount of unburned hydrocarbons generated in an engine and correcting a back injection amount. Dynamic driving conditions such as acceleration/deceleration driving generated in a vehicle even in a sophisticated model-based temperature control In order to improve the problem of overheating of the exothermic catalyst, we propose an exhaust gas temperature control method using unburned hydrocarbon predictive modeling in the exothermic catalyst temperature control method using a model-based regeneration temperature control of a diesel engine. The method comprises the steps of calculating the internal temperature of the catalyst; Calculating the exothermic temperature of the catalyst; Determining whether the catalyst exothermic temperature> the first preset value and the catalyst shear temperature a first preset value and the catalyst shear temperature second preset value; And correcting the amount of post-injection fuel to be actually injected into the cylinder in order to generate the unburned hydrocarbon amount predicted in the above step at the engine exit.