Patent ID: 11906056
Assignee: RATIER-FIGEAC SAS
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. A hydraulic control system for an actuator, the system comprising:
a first two-position solenoid valve and a second two-position solenoid valve; and
an apparatus for monitoring the pressurisation of a control valve for a hydraulic actuator, comprising:
a three-position control valve comprising a spool movable along an axis between a first axial position and a second axial position, wherein the spool is configured to control the flow of hydraulic fluid through the control valve based on its position along the axis so as to control the actuation of a component in a first direction when the spool is in a first actuation position, the first actuation position being a first position of the three-position control valve, and in a second direction when the spool is in a second actuation position, the second actuation position being a second position of the three-position control valve; and
a position sensor configured to detect a slight variation in a neutral, resting position of the spool, the neutral, resting position of the spool being a third position of the three-position control valve,

wherein in an unpressurised state of the control valve the neutral, resting position of the spool corresponds to the first axial position, and in a pressurised state of the control valve the neutral, resting position is modified such that it moves to the second axial position; and
wherein the first two-position solenoid valve and the second two-position solenoid valve are configured to supply hydraulic fluid selectively to the control valve to move the spool from the second axial position to one of the first actuation position or the second actuation position.