Exhaust temperature based control strategy for balancing cylinder-to-cylinder fueling variation in a combustion engine

摘要

In order to improve the performance of a common rail engine and reduce the number of false alarms by the exhaust gas temperature monitoring system, the present disclosure provides a control strategy for balancing injector-to-injector fueling variations for a combustion engine having multiple combustion chambers (and cylinders), with multiple individually actuated injectors for injecting fuel into the combustion chambers, wherein at least one injector is assigned to each combustion chamber and a common rail supplies fuel to the multiple injectors. The method includes controlling the injectors in accordance with a requested fueling map, monitoring the exhaust gas temperature of each combustion chamber, determining an average exhaust gas temperature of the combustion chambers, establishing whether the exhaust gas temperature of a combustion chamber deviates by more than a predetermined value from the average exhaust gas temperature, and changing the actuation waveform of an injector assigned to a combustion chamber having an exhaust gas temperature deviating by more than the predetermined value from the average exhaust gas temperature, in order to change the amount of fuel injected.