Maßnahmen zur zylinderspezifischen Voreinspritzmengenzumessung am PKW Common Rail Dieselmotor

Modern common rail diesel engines require exact amounts of fuel injected because of the influence of fuel injection on exhaust gas and acoustic emissions. The actual injected amount of fuel can not be measured during the engine is running, therefore fuel injection can only be controlled. Because of high injection pressure, the dispersion of production of the injection units result in different amounts of fuel injected under the same conditions (rail pressure and the duration of injection). Furthermore the problem of different aging process of new injection units and the influence of the application of the fuel injection has to be solved. This diploma thesis examines a method to detect the amount of fuel injected using a knock sensor to apply exact fuel injection for each cylinder during the lifetime of the engine. Using the knock sensor signal an adaptive algorithm is developed to minimize dispersion in injected fuel amount and to detect missing pilot injection.