Patent ID: 6213099
Filing Date: 2001-04-10
Classification: F02D

Abstract:
A system for controlling a fuel injector in accordance with an injection control strategy for an internal combustion engine including a controller in communication with a current driver connected to the injector, the controller commanding injection by generating a command signal, the current driver being connected to a sensing element that provides an injector signal indicative of the injector current, the system comprising:programmable control logic configured to provide a threshold signal indicative of a threshold current for the injector, the control logic being programmable to allow selection of the threshold current; anda comparator circuit including a comparator that receives and compares the injector signal to the threshold signal and provides an output signal based on the comparison to allow the injector to be controlled based on the comparison wherein the comparator circuit includes a detection portion for detecting an inflection in the injector current, wherein the programmable control logic provides a first threshold signal indicative of an upper characteristic threshold current for the injector and a second threshold signal indicative of a lower characteristic threshold current for the injector, the detection portion includinga first comparator receiving and comparing the injector signal to the first threshold signal, and providing an output based on the comparison; anda second comparator receiving and comparing the injector signal to the second threshold signal, and providing an output based on the comparison.