Correction of fuel injection timings in an internal combustion engine

摘要

A means of correcting the fuel injection timing in an internal combustion engine is provided. Fuel injection timing is based on the crankshaft rotation rate measured during a test fuel injection routine, the crankshaft rotation rate being obtained from a crankshaft position signal 500, wherein noise filtering is used to filter out the crankshaft position signal at a particular frequency, fn, to provide a more accurate determination of crankshaft rotation rate and a corresponding increase in accuracy of fuel injection times. The blanked frequency corresponds to a frequency at which there is expected to be noise in the position signal due to vibrations in the engine system in general and noise from the driveline at certain higher gears in particular which leads to errors in the detected crankshaft position signal.