Automatic control of passive, towed implements
First Claim
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1. A control system for towing a passive implement along a desired path with an autopilot-controlled tractor comprising:
- a GNSS receiver mounted on the passive implement;
a control module; and
,a model comprising implement, tractor and hitch elements ordered within the model so that nudge inputs to the model are applied directly to the input of the implement element and the output of the implement element is fed back to the control module;
wherein,the passive implement is connected to the tractor by a hitch, the GNSS receiver measures position and speed of the passive implement,the model estimates immediate passive implement offset and delayed offset of the tractor-hitch-implement system from the desired path,the control module sends nudge commands to the autopilot-controlled tractor such that passive implement offset from the desired path is minimized.
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Abstract
An automatic control system for passive, towed implements is described. The system provides a strategy for optimal control of a towed implement using a nudge input to an autopilot-controlled tractor. Implement path-tracking error, as measured by a GNSS receiver, is consistently corrected to zero.
43 Citations
24 Claims
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1. A control system for towing a passive implement along a desired path with an autopilot-controlled tractor comprising:
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a GNSS receiver mounted on the passive implement; a control module; and
,a model comprising implement, tractor and hitch elements ordered within the model so that nudge inputs to the model are applied directly to the input of the implement element and the output of the implement element is fed back to the control module; wherein, the passive implement is connected to the tractor by a hitch, the GNSS receiver measures position and speed of the passive implement, the model estimates immediate passive implement offset and delayed offset of the tractor-hitch-implement system from the desired path, the control module sends nudge commands to the autopilot-controlled tractor such that passive implement offset from the desired path is minimized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for guiding a passive implement along a desired path comprising:
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providing an autopilot-controlled tractor having a nudge input; providing a GNSS receiver fixed to the passive implement; towing the passive implement behind the tractor via a hitch; using a model of the tractor—
hitch—
implement system to provide feedback to a control system that provides nudge inputs to the autopilot-controlled tractor and to the model;wherein, the model estimates the immediate passive implement offset from the path; tractor, hitch and implement elements within the model are arranged such that nudge inputs from the control system are applied to the implement element directly; and
,the control system nudge inputs cause the difference between the actual passive implement path and desired path to be minimized. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A control system for a passive implement towed by an autopilot-controlled tractor comprising:
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an inner feedback loop that uses estimated immediate passive implement offsets from a desired path to modify the dynamic behavior of the implement; an outer feedback loop that uses the difference between estimated delayed passive implement offsets from the path and actual measured passive implement offsets from the path to compensate for drift and disturbances; and
,a control module that combines measured passive implement speed with error signals generated by the inner and outer loops to generate nudge commands that are fed to the tractor'"'"'s autopilot such that the passive implement offset from the desired path is minimized. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A control system for a passive implement towed by an autopilot-controlled tractor comprising:
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a GNSS receiver mounted on the passive implement; and
,a feedback loop incorporating a Smith predictor, wherein, nudge commands are sent to the tractor'"'"'s autopilot and to a model of a tractor—
hitch—
implement system,estimated immediate passive implement offset (from a desired path) obtained from the model is used to speed up the response of the passive implement, and, estimated delayed passive implement offset obtained from the model is compared to actual passive implement offset to compensate for process disturbances. - View Dependent Claims (24)
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Specification