PTO Transmission Speed Display for Work Vehicles
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Solution Overview
Problem
Conventional work vehicles, such as tractors, do not provide operators with advance information on how the output rotational speed of the PTO shaft changes with operations on the PTO transmission, leading to inefficient operation and potential repeated shifting to achieve desired speed.
Innovation Solution
A work vehicle equipped with a multi-stage PTO transmission and a display device that calculates and displays the expected maximum rotational speed of PTO rotary power for each speed-changing stage, allowing operators to plan suitable operational speeds without performing actual speed-changing operations on the PTO transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the PTO transmission is shifted to change the output rotational speed, then the rotational speed of the PTO shaft can be adjusted to match the working state, but the operator cannot know in advance how the speed will change and may need to repeat shifting operations
Solution Approach 1:
The display device shows the maximum rotational speed for each speed-changing stage of the PTO transmission in advance, before the operator actually shifts. This allows the operator to plan and determine the appropriate shifting operation beforehand, avoiding repeated trial-and-error shifting and saving time.
Solution Approach 2:
The system provides visual feedback by displaying the expected maximum rotational speed for each PTO transmission stage on the liquid crystal display. This feedback loop allows the operator to see the consequence of each potential shifting action before executing it, enabling more precise and efficient operation.
2Productivity
If the operator determines the PTO shaft speed based on knowledge and experience, then no additional display system is needed, but the operator cannot achieve precise speed adjustment without trial and error
Solution Approach 1:
The existing liquid crystal display device in the work vehicle is utilized to display PTO transmission information. By making the display serve multiple functions (showing both vehicle operating information and PTO speed information), the system avoids adding complex dedicated display hardware while improving productivity.
Data Source
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AI summary
In a work vehicle according to the present invention, a control device calculates, for each of a plurality of speed-changing stages in a PTO transmission, an expected maximum rotational speed of PTO rotary power that is output from the PTO shaft when an engine rotational speed changing operation member is operated to a maximum extent, and shows, in a listed manner, the calculated results in a liquid crystal display part of a display device. The present invention can inform an operator of the maximum rotational speed of PTO rotary power that is output from the PTO shaft for each speed-changing stage in the PTO transmission without performing a speed changing operation on the PTO transmission.