Common rail system fault diagnostic using digital resonating filter

摘要

A common rail fuel system diagnostic algorithm is executed by an engine control and real time to detect and identify a faulty fuel system component. Rail pressure data is processed through a digital resonating filter having a resonance frequency corresponding to a fault signature. A peak magnitude and phase of the output from the digital resonating filter reveals a degradation level of a fuel injector, and a phase of the output identifies which fuel injector is faulted.

主权项

1. A method of detecting a common rail fuel system fault, comprising the steps of:
supplying fluid to individual fuel injectors from a common rail; sensing a fluid pressure in the common rail; detecting a fault signature in rail pressure data for an engine cycle; confirming a system fault by repeating detection of the fault signature for a plurality of engine cycles; the detecting step includes processing the rail pressure data through a digital resonating filter with a resonance frequency corresponding to the fault signature; and the confirming step includes comparing a peak magnitude of an output from the digital resonating filter to a predetermined threshold.