Electric PTO Speed Mapping for Variable Ground-Speed Control
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Solution Overview
Problem
Conventional combustion engine tractors have a fixed relationship between the acceleration/deceleration of the tractor and the rotational speed of the power take-off (PTO), limiting control over the PTO speed based on the vehicle's speed.
Innovation Solution
An electric work vehicle with a power take-off (PTO) control method that generates a new ground speed power take-off (G-PTO) map, allowing operators to set and control the relationship between the work vehicle speed and PTO speed through a user interface, including setting points and limits on the map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed gear ratio relationship is used between the power source and wheels, then the structure is simple, but the control over PTO speed based on vehicle speed is limited
Solution Approach 1:
The patent implements a dynamic G-PTO map that allows the PTO speed to be dynamically adjusted based on the actual vehicle speed. The control unit continuously updates the PTO speed command value according to the detected vehicle speed and the stored G-PTO map, enabling the system to adapt to varying operating conditions rather than relying on a fixed mechanical gear ratio.
Solution Approach 2:
The patent changes the operational parameters by allowing operators to customize the G-PTO map with different vehicle speed-PTO speed relationships. The control unit stores multiple G-PTO maps with different parameter sets, and operators can select and adjust these parameters to match specific work requirements, transforming a fixed-parameter system into a variable-parameter system.
2Ease of operation
If the PTO speed is fixed relative to vehicle acceleration, then the control system is simple, but the operational flexibility is reduced
Solution Approach 1:
The system provides self-service functionality by allowing operators to independently configure and customize the G-PTO map according to their specific work requirements. The control unit includes a map setting function that enables operators to input desired vehicle speeds and corresponding PTO speeds, automatically generating the speed relationship map without requiring complex external calibration or specialized setup procedures.
Solution Approach 2:
The patent implements preliminary action by pre-storing multiple G-PTO maps in the control unit that cover different operating scenarios. Operators can select from these pre-configured maps or customize them in advance, so that when actual work begins, the appropriate speed relationship is already established and ready for immediate use, eliminating the need for real-time adjustments during operation.
Data Source
AI summary
A method for generating a new ground speed power take-off (G-PTO) map that includes a relationship between a current work vehicle speed and a target speed of a power take-off (PTO). The method includes setting a work vehicle speed for a point to be included in the new G-PTO map, setting a PTO speed for the point to be included in the new G-PTO map, plotting the point on the new G-PTO map, and plotting a line on the new G-PTO map based on the point.