Systems, assemblies, and methods can involve a retainer assembly adapted to interface with a sensor rod of an in-cylinder position sensor assembly of a fluid cylinder. The retainer assembly can comprise an annular body that defines a bore extending from a first end of the annular body to a second end of the annular body opposite the first end; a sleeve disposed in the bore at an inner wall of the annular body; and one or more magnets fixedly provided between the annular body and the sleeve in a radial direction of the annular body. Each of the one or more magnets may be fixedly molded in place between the annular body and the sleeve in the radial direction of the annular body.

A system for measuring the position of a rod element as, for example, a hydraulically or pneumatically operated piston rod. Unlike the prior art, the system according to the present invention employs a measuring principle that does not require preparatory treatment of the rod element as is required in the known solutions. The system employs direct time of flight measurements with the aid of acoustic surface waves that are introduced into the rod element. The instrument is retrofittable on existing cylinders without any modification/reconstruction thereof. An EMAT principle is employed to introduce the surface waves into the measurement in a non-contact manner.

A fluid pressure actuator is provided with an actuator main portion whose shape is changed by the expansion or contraction of a cylindrical tube expanded and contracted by the pressure of fluid, and a detection unit for detecting the length L of the actuator main portion along the longitudinal direction of the tube.

Systems, assemblies, and methods can involve a retainer assembly adapted to interface with a sensor rod of an in-cylinder position sensor assembly of a fluid cylinder. The retainer assembly can comprise an annular body that defines a bore extending from a first end of the annular body to a second end of the annular body opposite the first end; a sleeve disposed in the bore at an inner wall of the annular body; and one or more magnets fixedly provided between the annular body and the sleeve in a radial direction of the annular body. Each of the one or more magnets may be fixedly molded in place between the annular body and the sleeve in the radial direction of the annular body.

A sensor unit for a fluidic cylinder having a base carrier on which a circumferential seal is formed, so that an interior of the fluidic cylinder is sealable, and having a position sensor for detecting a position of the piston, and having a pressure sensor for detecting a pressure in the interior.

The subject matter of this specification can be embodied in, among other things, a position sensor system that includes a sensor housing defining a first cavity having a first face, a fluid effector including an actuator housing having an inner surface defining a second cavity, and a moveable body having a second face and configured for reciprocal movement within the second cavity, an acoustic transmitter system configured to emit a first emitted acoustic waveform toward the first face, and emit a second emitted acoustic waveform toward the second face, and an acoustic receiver system configured to detect a first reflected acoustic waveform based on a first reflection of the first emitted acoustic waveform based on the first face, and detect a second reflected acoustic waveform based on a second reflection of the second emitted acoustic waveform based on the second face.

Provided are embodiments for a system including an adaptive controller, wherein the system includes a hydraulic actuator including a fluid medium, and a sensor that is disposed on the hydraulic actuator, wherein the sensor is configured to obtain sensor data of the actuator. The system also includes a processor configured to calculate an ultrasonic velocity in the fluid medium using the sensor data, wherein the processor is further configured to determine a temperature of the fluid medium based at least in part on the calculated velocity, and a controller coupled to the actuator, wherein the controller is configured to control the actuator based at least in part on the calculated velocity and determined temperature. Also provided are embodiments for a method for operating the adaptive controller.

Provided are embodiments for a system including an adaptive controller, wherein the system includes a hydraulic actuator including a fluid medium, and a sensor that is disposed on the hydraulic actuator, wherein the sensor is configured to obtain sensor data of the actuator. The system also includes a processor configured to calculate an ultrasonic velocity in the fluid medium using the sensor data, wherein the processor is further configured to determine a temperature of the fluid medium based at least in part on the calculated velocity, and a controller coupled to the actuator, wherein the controller is configured to control the actuator based at least in part on the calculated velocity and determined temperature. Also provided are embodiments for a method for operating the adaptive controller.

A sensor unit for a fluidic cylinder having a base carrier on which a circumferential seal is formed, so that an interior of the fluidic cylinder is sealable, and having a position sensor for detecting a position of the piston, and having a pressure sensor for detecting a pressure in the interior.

Disclosed is a piston position control system that includes a fluid control valve configured to control a position of a piston. The piston position control system includes a controller having stored instructions operable to receive a piston position command. The stored instructions are operable to receive a first time-of-flight and a second time-of-flight. The stored instructions are operable to operate the fluid control valve to adjust the position of the piston according to the piston position command based on a position estimate defined by the first time-of-flight, t.sub.1 and the second time-of-flight, t.sub.2. The stored instructions are operable to adjust the position estimate to operate the fluid control valve based on a baseplate temperature derived from a fluid temperature defined by the first time-of-flight and the second time-of-flight.