Fuel injector control

Details Fuel injector control Fuel injector control

2011-08-16

2011-08-16

Vo, Hieu T (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C239S102200

Reexamination Certificate

active

08000876

ABSTRACT:
A method of operating a fuel injector having a piezoelectric actuator that is operable by applying an electrical drive pulse thereto to activate and deactivate the injector. The method includes monitoring an electrical characteristic of the actuator during a predetermined time period, determining a time-domain data sample corresponding to the monitored electrical characteristic during the predetermined time period, determining a frequency spectrum signature corresponding to the time-domain data sample, and comparing the frequency spectrum signature of the monitored electrical characteristic to a predetermined frequency spectrum signature indicative of an injector event.

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patent: 2003/0209235 (2003-11-01), Javaherian
patent: 2006/0082252 (2006-04-01), Allmendinger et al.
patent: 1139445 (2001-10-01), None
patent: WO 2007/014863 (2007-02-01), None

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