method for identifying error conditions of dieseleinspritzanlagen

摘要

The waveforms of pressure at the injectors (1.1a-1.1d) of the four cylinders are detected e.g. by piezoelectric transducers clamped to the injection lines close to the nozzles. The detected waveform for each individual injector is normalised w.r.t. a standard curve and evaluated by comparison. Cross-correlation is performed between discrete values of the waveform sampled at regular intervals. Temporally matched individual injections are extracted from maxima of the cross-correlation function, and matched in terms of amplitude to the standard curve by linear regression.