Process for automatically controlling a servo-valve with...

Details Process for automatically controlling a servo-valve with... Process for automatically controlling a servo-valve with...

G - Physics

05

D

G05D 16/20 (2006.01)

Patent

CA 2231340

The invention concerns a process for automatically controlling a hydraulic servo-valve with a hydraulic slide valve (1) which is displaced by a rotary actuator (12). The process involves a first loop (2, 5, 11, 12, 4) for automatically controlling the delivery as a function of the measurement of the angular position of the rotary actuator, and a second automatic control loop (1, 3, 6, 21, 22, 23, 11, 12, 4, 2) with variable control as a function of the pressure measurement. The invention is characterized in that the first automatic control loop is a proportional action loop whose increase (K¿pa?) is constant for values of the absolute pressure difference value (.epsilon.¿p?) which are less than at least a threshold value, then varies in an increasing manner for values of the absolute pressure difference value (.epsilon.¿p?) which are greater than this first threshold.

Pour l'asservissement d'une servovalve hydraulique à tiroir hydraulique (1) mis en mouvement par un actionneur rotatif (12), impliquant une première boucle (2, 5, 11, 12, 4) d'asservissement du débit en fonction de la mesure de la position angulaire de l'actionneur rotatif et une deuxième boucle (1, 3, 6, 21, 22, 23, 11, 12, 4, 2) d'asservissement à commande variable en fonction de la mesure de la pression, l'invention est caractérisée en ce que la première boucle d'asservissement est une boucle à action proportionnelle dont le gain (Kpa) est constant pour des valeurs de la valeur absolue de l'écart de pression (.epsilon.p) qui sont inférieures à au moins une valeur de seuil, puis varie de manière croissante pour les valeurs de la valeur absolue de l'écart de pression (.epsilon.p) qui sont supérieures audit premier seuil.

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