A control apparatus for operating a fuel injector

A control apparatus for operating a fuel injector (160, Fig.1) to inject fuel into an internal combustion engine, wherein the control apparatus identifies when the engine is running under a fuel cut-off condition, and then determines an actual value (ETA) of energizingtime that causes the fuel injec...

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Bibliographische Detailangaben
Hauptverfasser:	VALERIO NUZZO, MARCO GIROTTO, ANGELO CANCELLIERI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION ENGINES CONTROLLING COMBUSTION ENGINES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MECHANICAL ENGINEERING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	A control apparatus for operating a fuel injector (160, Fig.1) to inject fuel into an internal combustion engine, wherein the control apparatus identifies when the engine is running under a fuel cut-off condition, and then determines an actual value (ETA) of energizingtime that causes the fuel injector (160) to inject a target fuel quantity. Wherein the fuel injector performs several test injections with different energizing times (ETi), measures for each test injection, an engine torque value (Ti) caused by the test injection, uses the measured torque values (Ti) and their correspondent energizing times (ETj) to extrapolate the actual value (ETA) of the energizing time that corresponds to an engine torque that is consistent with the target fuel quantity. Wherein the energizing time value (ETj) of each one of the test injections is predetermined for the fuel injector to inject a fuel quantity that is bigger than the target fuel quantity. Each injection uses more fuel than the target quantity so that the torque produced will be higher than is produced by the target quantity so that the torque can be more accurately measured.