Aging effects such as coking or erosive damage that occur in fuel injection nozzles are known to deteriorate the engine performance. This article proposes an optimization method to compensate for injector aging and to control the combustion behavior over engine lifetime by adapting the injection strategy. First, a control-oriented combustion model is presented, which takes the condition of the injection nozzle into account. In combination with a simulation model of the entire fuel injection system from a previous study, the model is capable of predicting the heat release rate (HRR) at different working conditions. Measurements with a single-cylinder diesel engine were performed, using injectors with modified and aged nozzles, to validate the proposed combustion model and particularly to analyze the influence of injector aging. Using the simulation model, optimal injection strategies were obtained by applying a line search optimization scheme to recover a reference HRR trajectory. Simulation results of the proposed method demonstrate the great potential for improving long-term engine efficiency and controlling exhaust emissions.
Optimal Injection Strategies to Compensate for Injector Aging in Common Rail Fuel Systems
Sae Int. J. Engines
WCX World Congress Experience ; 2018
Sae International Journal of Engines ; 11 , 6 ; 1083-1092
2018-04-03
10 pages
Aufsatz (Konferenz)
Englisch
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