Method and apparatus for diagnosis injectors

G - Physics – 01 – R

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G01R 31/06 (2006.01) F02M 65/00 (2006.01)

Patent

CA 2502110

A tester for conveniently diagnosing the fuel injectors of an internal combustion engine is described. The fuel injector includes an injector coil that is charged during an energizing period. The tester calculates the difference between two sample signals obtained during the energizing period. The tester determines a first operational status of the injector based on this difference, and a second operational status based on the level of at least one of the sampled signals.

L'invention concerne un appareil de contrôle servant à déterminer, de manière pratique, l'état de fonctionnement des injecteurs de carburant d'un moteur à combustion interne, ces injecteurs étant pourvus d'une bobine d'injection qui est chargée lors d'une période d'excitation. L'appareil de contrôle selon l'invention calcule la différence entre deux signaux échantillon obtenus lors de ladite période d'excitation. Cet appareil de contrôle détermine un premier état de fonctionnement de l'injecteur en fonction de cette différence, ainsi qu'un second état de fonctionnement en fonction du niveau d'au moins un des signaux échantillon.

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