Apparatuses and methods for measuring saddle linkage position of a motor grader

1. A grader comprising:

a chassis;

a saddle linkage supported for movement relative to the chassis that includes a mount movably coupled to the chassis, first and second arms each movably coupled to the mount, and a crossbar movably coupled to each of the first and second arms, wherein the mount has a lock pin aperture, each of the first and second arms has a locking hole, and the crossbar has a plurality of locking holes, and wherein the lock pin aperture may be aligned with one locking hole of the first arm, the second arm, or the crossbar to position the saddle linkage in use of the grader; and

a motion measurement system coupled to the saddle linkage that is configured to measure movement or position of one or more components of the grader in use thereof, wherein the motion measurement system includes at least one sensor mounted to the mount in close proximity to the lock pin aperture and at least one indicator mounted in close proximity to at least one of the locking holes, wherein the at least one sensor is configured to sense the at least one indicator and provide sensor input indicative of one or more characteristics of the at least one indicator, and wherein the motion measurement system further includes a controller that is coupled to the at least one sensor and configured to receive the sensor input and determine a positional state of the saddle linkage based on the sensor input.

2. The grader of claim 1 , wherein the locking holes comprise seven locking holes, and wherein the at least one indicator of the motion measurement system comprises a set of indicators that correspond to, and are located in close proximity to, each of the seven locking holes.

3. The grader of claim 2 , wherein each set of indicators comprises three indicators.

4. The grader of claim 1 , wherein the at least one sensor of the motion measurement system comprises three hall effect sensors that are spaced from one another and the lock pin aperture.

5. The grader of claim 4 , wherein the locking holes comprise seven locking holes, and wherein the at least one indicator of the motion measurement system comprises a set of three magnets that correspond to, and are spaced from, each of the seven locking holes.

6. The grader of claim 1 , wherein the at least one sensor of the motion measurement system comprises at least one inductive sensor that is spaced from the lock pin aperture.

7. The grader of claim 6 , wherein the locking holes comprise seven locking holes, and wherein the at least one indicator of the motion measurement system comprises a set of one or more machined surfaces that correspond to, and are spaced from, each of the seven locking holes.

8. The grader of claim 7 , wherein each set of one or more machined surfaces comprises a first surface that is recessed a first distance from an exterior face of the first arm, the second arm, or the crossbar, a second surface that is recessed a second distance from the exterior face that is different from the first distance, and a third surface that is recessed a third distance from the exterior face that is different from the second distance.

9. The grader of claim 1 , wherein the at least one sensor of the motion measurement system comprises at least one light sensor that is spaced from the lock pin aperture.

10. The grader of claim 9 , wherein the locking holes comprise seven locking holes, and wherein the at least one indicator of the motion measurement system comprises a set of one or more optical targets that correspond to, and are spaced from, each of the seven locking holes.

11. The grader of claim 10 , wherein each set of one or more optical targets comprises first, second, and third reflectors that are spaced from one another, and wherein each of the first, second, and third reflectors is configured to reflect light provided by a light source toward the at least one light sensor so that the reflected light may be detected by the at least one light sensor.

12. The grader of claim 11 , wherein the light source is located in close proximity to the at least one light sensor and the lock pin aperture.

13. The grader of claim 10 , wherein each set of one or more optical targets comprises first, second, and third markers that are spaced from one another, and wherein the first, second, and third markers are configured to provide various colors that may be detected by the at least one light sensor.

14. A method of operating a grader, the grader including a chassis, a saddle linkage supported for movement relative to the chassis that has a mount movably coupled to the chassis and having a lock pin aperture, first and second arms each movably coupled to the mount and each having one locking hole, and a crossbar movably coupled to each of the first and second arms that has a plurality of locking holes, and a motion measurement system coupled to the saddle linkage that has at least one sensor mounted to the mount in close proximity to the lock pin aperture, at least one indicator mounted in close proximity to at least one of the locking holes, and a controller, the method comprising:

receiving, by the controller, sensor input provided by the at least one sensor that is indicative of one or more characteristics of the at least one indicator; and

determining, by the controller, a positional state of the saddle linkage based on the sensor input, wherein determining the positional state of the saddle linkage based on the sensor input includes encoding, by the controller, the positional state of the saddle linkage based on the sensor input.

15. The method of claim 14 , wherein receiving the sensor input comprises receiving, by the controller, sensor input provided by each of three hall effect sensors that are spaced from one another and the lock pin aperture and configured to provide sensor input based on sets of three magnets that correspond to, and are spaced from, each of seven locking holes.

16. The method of claim 14 , wherein receiving the sensor input comprises receiving, by the controller, sensor input provided by at least one inductive sensor that is spaced from the lock pin aperture and configured to provide sensor input based on sets of one or more machined surfaces that correspond to, and are spaced from, each of seven locking holes.

17. The method of claim 16 , wherein receiving the sensor input provided by the at least one inductive sensor based on the sets of one or more machined surfaces comprises receiving, by the controller, sensor input provided by the at least one inductive sensor that is based on seven sets of machined surfaces each including a first surface recessed a first distance from an exterior face of the first arm, the second arm, or the crossbar, a second surface recessed a second distance from the exterior face that is different from the first distance, and a third surface recessed a third distance from the exterior face that is different from the second distance.

18. The method of claim 14 , wherein receiving the sensor input comprises receiving, by the controller, sensor input provided by at least one light sensor that is spaced from the lock pin aperture and configured to provide sensor input based on sets of one or more optical targets that correspond to, and are spaced from, each of seven locking holes.

19. The method of claim 18 , wherein receiving the sensor input provided by the at least one light sensor based on the sets of one or more optical targets comprises receiving, by the controller, sensor input based on sets of three optical targets each including at least one of:

first, second, and third reflectors spaced from one another and each configured to reflect light provided by a light source toward the at least one light sensor so that the reflected light may be detected by the at least one light sensor; and

first, second, and third markers spaced from one another and configured to provide various colors that may be detected by the at least one light sensor.

20. A grader comprising:

a chassis;

a saddle linkage supported for movement relative to the chassis that includes a mount movably coupled to the chassis, first and second arms each movably coupled to the mount, and a crossbar movably coupled to each of the first and second arms, wherein the mount has a lock pin aperture, each of the first and second arms has a locking hole, and the crossbar has a plurality of locking holes, and wherein the lock pin aperture may be aligned with one locking hole of the first arm, the second arm, or the crossbar to position the saddle linkage in use of the grader;

a work implement assembly movably coupled to the chassis and the saddle linkage, wherein the work implement assembly includes at least one component that is configured to grade a surface in use of the grader; and

a motion measurement system coupled to the saddle linkage that is configured to measure movement or position of one or more components of the grader in use thereof, wherein the motion measurement system includes at least one sensor mounted to the mount in close proximity to the lock pin aperture and at least one indicator mounted in close proximity to at least one of the locking holes, wherein the at least one sensor is configured to sense the at least one indicator and provide sensor input indicative of one or more characteristics of the at least one indicator, and wherein the motion measurement system further includes a controller that is coupled to the at least one sensor and configured to receive the sensor input, encode the sensor input based on at least one 3-bit data string, and determine a positional state of the saddle linkage based on the encoded sensor input.