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Robust Injection Rate Estimation in Common Rail Diesel Injectors with Nozzle Wear
FISITA2016/F2016-ESYH-009

Authors

Hofmann, Oliver; Huber, Benedikt; Rixen, Daniel -
Institute of Applied Mechanics, Technical University of Munich, Germany

Abstract

KEYWORDS – common rail diesel injector, injection rate estimation, sliding mode observer, nozzle wear, aging effects

ABSTRACT –

The combustion performance in common rail diesel injectors is significantly influenced by the injection rate. Aging effects such as coking or cavitation, which develop in the injector nozzles over the lifetime, deteriorate the injection behavior and result in increasing soot and nitrogen oxide (NOx) emissions. The objective of this study is to present a robust injection rate estimator considering wear and aging effects within the injector nozzle. The two-stage estimation process consists of a wear estimator to identify wear effects within the injector nozzle and a sliding mode observer to improve the estimation accuracy and to cope with uncertainties.

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