Experimental validation of a leakage and fill-level estimation method for vented tanks

Commonly used pneumatic fill-level sensing methods are typically limited by the requirement of a perfectly sealed tank system. In the paper, we present first experimental results for a model-based approach that is capable of distinguishing between the influences of varying free volume inside the tank and of small ventilation holes and leakages in the tank hull. The results are obtained by considering the estimated values of the lossless parameters in the equivalent circuit model that correspond to the actual free volume and leakage magnitude.