Systems and methods for determining an articulated trailer angle
Systems and methods determine an angle of an articulated trailer relative to a tractor that the trailer is hitched to. An encoder is positioned beneath a fifth-wheel of a tractor to couples with a kingpin of the trailer when the trailer is hitched to the tractor. The coupler has a rotating shaft that may include pins that physically interact with the kingpin and/or may include a magnet that magnetically attaches to the kingpin. A clearance and cleaning block may be positioned on the spring plate to interact with a bottom surface of a kingpin of the trailer during hitching of the trailer to the tractor. A LIDAR attached to the tractor may detect a front end of the trailer to determine the trailer angle relative to the tractor.
1 . A trailer angle encoder for determining an angle between an autonomous tractor and a trailer coupled thereto, comprising:
an arm coupled at a pivot with a flange located beneath a fifth-wheel of the tractor;
an optical encoder positioned at a first end of the arm and having a rotatable shaft with a mechanical coupler, the mechanical coupler comprising:
a disc mechanically coupled to the rotatable shaft,
a plurality of pins distributed around a first side of the disc and each pin having a point that mechanically engages with a bottom surface of a kingpin of the trailer;
wherein the arm is positioned to mechanically couple the mechanical coupler with the kingpin.
2 . The trailer angle encoder of claim 1 , further comprising a solenoid mechanically coupled with the flange and operable to move a second end of the arm against a spring.
3 . The trailer angle encoder of claim 2 , the solenoid causing the arm to disengage the mechanical coupler from the kingpin, and the spring causing the arm to engage the mechanical coupler with the kingpin when the solenoid is deactivated.
4 . The trailer angle encoder of claim 2 , the solenoid causing the arm to engage the mechanical coupler with the kingpin.
5 . The trailer angle encoder of claim 1 , the mechanical coupler comprising a conical adapter fixedly coupled with the rotatable shaft and having a conical shape that tapers internally from a first diameter, nearest the encoder, smaller than a diameter of a flange of the kingpin, to a second diameter greater than the diameter of the flange.
6 . The trailer angle encoder of claim 5 , the conical adapter being at least partially formed of a flexible material that mechanically grips the flange when pressed there against.
7 . The trailer angle encoder of claim 5 , the arm comprising:
a first plate forming the first end;
a second plate coupled with the pivot;
at least one longitudinal shaft coupling the first plate with the second plate and allowing longitudinal movement of the first plate relative to the second plate; and
wherein the longitudinal movement allows the conical adapter to longitudinally center on the flange.
8 . The trailer angle encoder of claim 7 , further comprising at least two springs positioned on the longitudinal shaft to return the first plate to a nominal longitudinally central position when the conical adapter disengages with the flange.
9 . The trailer angle encoder of claim 7 , the pivot comprising a lateral shaft that further allows lateral movement of the second plate, where in the lateral movement allows the conical adapter to laterally center on the flange.
10 . The trailer angle encoder of claim 9 , further comprising at least two springs positioned on the lateral shaft to return the second plate to a nominal laterally central position when the conical adapter disengages with the flange.
11 . The trailer angle encoder of claim 7 , the first plate forming an aperture for securing the encoder.
12 . The trailer angle encoder of claim 1 , the encoder being an optical encoder.