Methods and apparatus are disclosed for a load-sensing hitch utilizing a system of strain gauges. An example apparatus includes a receiver tube, a side member, a crossbar coupled to the receiver tube and the side member, the cross including a support including a first end, a second end and a mid-portion located between the first end and the second end, the mid-portion having a cross-sectional area smaller than the cross-sectional area of the first end or the cross-sectional area of the second end and a strain gauge disposed within the mid-portion.

Methods, apparatus, systems and articles of manufacture are disclosed for payload estimation and fault detection using hitch integrated sensors. An example apparatus includes a pin orientation determiner to determine a first orientation of a first pin and a second orientation of a second pin, the first pin and the second pin disposed within a hitch and calculate a relative orientation of the first pin and the second pin based on the first orientation and the second orientation. The example apparatus further includes a hitch condition detector to determine if a physical change has occurred in the hitch by comparing the relative orientation to an installation orientation of the first pin and the second pin.

Systems and methods for determining force direction and magnitude acting on a trailer hitch are disclosed. An example vehicle includes two magnetoelastic pins, having respective magnetic fields, configured to couple a trailer hitch receiver to a vehicle chassis. The vehicle also includes a plurality of sensors corresponding to the two magnetoelastic pins, configured to detect changes in the respective magnetic fields. And the vehicle further includes a processor configured to determine a magnitude and direction of a force acting on the trailer hitch receiver based on data from the plurality of sensors.

A trailer coupling for a towing vehicle, having a coupling carrier, which includes, in particular, a coupling arm and at whose free end a coupling body, in particular, a coupling ball is arranged for connecting a trailer, and which coupling carrier is fixedly or movably arranged on a mount which is or can be attached to the towing vehicle, and having a sensor arrangement which has at least one sensor and has the purpose of sensing a traction force and/or thrust force which can be caused by a traction load acting on the coupling element during a traction operation of the trailer and of outputting a force signal representing the traction force and/or thrust force, and having an evaluation device for determining a trailer mass value of the trailer on the basis of the force signal.

A method for measuring the applied load on a towing hook/or a tow bar accessory of a towing hook arrangement for a vehicle, and a towing hook arrangement for a vehicle. The towing hook arrangement comprises a towing hook and/or a tow bar accessory arranged on a tow bar, the towing hook arrangement also comprises a sensor arrangement having at least one actuator and at least one sensor, the sensor arrangement is adapted to detect an imparted vibration on the tow bar and use the detected imparted vibration to determine the applied load on the towing hook and/or the tow bar accessory.

A hitch ball assembly for a trailer hitch. The hitch ball assembly includes a clam-shaped body having a plurality of hinged segments operable between an open position and a closed position. Each of the plurality of hinged segments includes a concave inner surface that collectively form a ball shaped-cavity configured to enclose a smaller-diameter hitch ball. Each of the hinged segments further includes an outer surface that collectively form a larger-diameter hitch ball configured to engage a trailer tongue when the hinged segments are operated to the closed position.

One variation of a method includes, during a first time period: detecting a direction of motion of a trailer; detecting a first force applied to a kingpin; detecting an incline angle of the trailer; calculating a first target preload force opposite the direction of motion and inversely proportional to the incline angle; and in response to the first force falling below the first target preload force, triggering a motor to increase torque output opposite the direction of motion. The method further includes, during a second time period: detecting a second force applied to the kingpin; detecting a decline angle of the trailer; calculating a second target preload force opposite the direction of motion and inversely proportional to the decline angle; and in response to the second force falling below the second target preload force, triggering the motor to increase torque output opposite the direction of motion.

Measuring devices and methods for ascertaining an operating parameter at a shaft are disclosed. The shaft may be supported by at least one bearing. In one example, the measuring device includes at least one first sensor element configured to detect an absolute angle of the shaft and at least one second sensor element configured to detect a change in a distance of the shaft from the at least one second sensor element. A computing device may be configured to calculate one or more operating parameters at the shaft from the absolute angle of the shaft and the change in the distance.

A weight measuring hitch ball assembly is described. The assembly can include a hitch ball having a ball and a lower portion. The assembly can also include a body portion defining a hitch ball opening that slidably receives the lower portion of the hitch ball. The assembly can further include a load measurement device operably associated with the body portion and the hitch ball to determine a magnitude of a force acting on the hitch ball. Additionally, the assembly can include a retention coupling operable with the hitch ball and the body portion to secure the hitch ball to the body portion. The retention coupling can have a retention protrusion and a retention wall defining at least a portion of a retention opening operable to receive at least a portion of the retention protrusion therein. With the retention protrusion extending into the retention opening, the retention wall can provide a mechanical barrier to the retention protrusion that prevents removal of the hitch ball from the hitch ball opening. The retention opening can be configured to facilitate slidable movement of the hitch ball within the hitch ball opening sufficient to determine the magnitude of the force acting on the hitch ball.

Load measuring hitch assemblies are disclosed and described. In one embodiment, the assembly can include a body portion operable to facilitate coupling the load measuring hitch assembly to a tow vehicle. The assembly can also include at least one load cell operable to measure force in at least one measurement axis. Additionally, the assembly can include a ball portion having a ball operable to facilitate coupling the load measuring hitch assembly to a trailer. The ball portion and the body portion can be coupled to one another via the at least one load cell and a pin slot joint. The pin slot joint can provide relative motion between the ball portion and the body portion in a rotational degree of freedom about a first axis and a translational degree of freedom along a second axis. The first and second axes can be orthogonal to one another. The rotational and translational degrees of freedom between the ball portion and the body portion can facilitate transfer of a force to the at least one load cell in the at least one measurement axis, thereby facilitating determining a magnitude of at least one of a vertical or a horizontal force acting on the ball.