INJECTOR WAVEFORM

摘要

A system for controlling the displacement of a spool in a spool valve of a fuel injector. One or more coils may be employed to move the spool between closed and open positions in the fuel injector. The shape of the current waveform used to generate a magnetic field in one or more coils for displacing the spool may vary depending on engine operating conditions. Moreover, the shape of the current waveform applied to coils in the fuel injector may be different for engine operating conditions. Such differences in waveform shape may at least assist, in real time, with the engine obtaining improved engine emissions and/or otherwise obtaining fuel injection goals.

主权项

1. A method for controlling the movement of a spool of a spool valve comprising:
determining a first engine operating condition; selecting, by a control unit, based on the first engine operating condition, a first open current waveform; applying the first open current waveform to at least a first coil to displace the spool from a closed position to an open position; applying a first closed current waveform to at least a second coil to displace the spool from the open position to the closed position; determining a second engine operating condition; selecting, by a control unit, based on the second engine operating condition, a second open current waveform, the second open current waveform having a waveform shape different than a waveform shape of the first open current waveform; and applying the second open current waveform to at least the first coil to displace the spool from the closed position to the open position.