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

Claim 0:
1. 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 movable between first actuation position, a second actuation position and a neutral position of the control valve;
the control valve comprising a spool movable along an axis;
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 the first actuation position and in a second direction when the spool is in the second actuation position;
wherein the neutral position of the control valve comprises a mechanical neutral position of the spool along the axis and a hydraulic neutral position of the spool along the axis;
wherein in an unpressurised state of the control valve the spool occupies the mechanical neutral position and in a pressurised state of the control valve the spool occupies the hydraulic neutral position; and
a position sensor configured to monitor the position of the spool within the control valve and detect whether the spool occupies the mechanical neutral or the hydraulic neutral position;

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 hydraulic neutral position to one of the first actuation position or the second actuation position.