End of valve motion detection for a spool control valve

Details End of valve motion detection for a spool control valve End of valve motion detection for a spool control valve

2005-02-01

2005-02-01

Nguyen, Dinh Q. (Department: 3752)

Fluid sprinkling, spraying, and diffusing

Processes

Of fuel injection

C239S585100, C239S088000, C239S096000, C137S544000, C324S207200

Reexamination Certificate

active

06848626

ABSTRACT:
A fuel injector system (10) calculates a first derivative filtered signal and a second derivative filtered signal from an unpowered spool valve coil signal. When the spool valve (16) reaches the end of travel, either open or closed position, a flat slope f is generated on the falling edge of the bell shaped signal. The second derivative provides a readily apparent determination of when the steep slope occurs. A comparator (62) thereby need only determine when the second derivative is zero to identify that the spool valve has reached the end of travel.

REFERENCES:
patent: 5433109 (1995-07-01), Mayer-Dick et al.
patent: 5720261 (1998-02-01), Sturman et al.
patent: 5829396 (1998-11-01), Sturman
patent: 5954030 (1999-09-01), Sturman et al.
patent: 6053421 (2000-04-01), Chockley
patent: 6105616 (2000-08-01), Sturman et al.
patent: 6120005 (2000-09-01), Wright
patent: WO 9413991 (1994-06-01), None
PCT International Search Report for Application No. PCT/US02/07796 dated Jul. 2, 2002.

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