Predictive maintenance and initialization system for a...

Details Predictive maintenance and initialization system for a... Predictive maintenance and initialization system for a...

2006-06-27

2006-06-27

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Processes

C091S362000, C137S554000, C137S625650

Reexamination Certificate

active

07066189

ABSTRACT:
Provided is a servovalve system for regulating fluid flowing within a fluid circuit. The servovalve system comprises a housing, a spool slidably disposed within the housing, a stepper motor operatively connected to the spool, and a controller and a position sensor electronically connected to the stepper motor. The controller generates driver signals representative of a desired amount of stepper motor rotation in order to cause the stepper motor to effectuate spool motion relative to the housing. The position sensor senses an actual amount of stepper motor rotation and generates a quantity of position signals representative thereof. The controller determines a signal ratio of the quantity of the position signals to the quantity of the driver signals and generates a diagnostic signal when the signal ratio reaches a threshold value representative of a predetermined level of mechanical resistance of spool motion relative to the housing.

REFERENCES:
patent: 4951549 (1990-08-01), Olsen et al.

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