Creeper Mode Selection Lever for Work Vehicle Transmission
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Solution Overview
Problem
Existing work vehicle transmissions often lack a low enough gear range to achieve the desired ultra-low speed required for operations like tillage or planting, necessitating a creeper mode to reduce ground speed effectively.
Innovation Solution
A mechanical creeper mode selection system for work vehicle transmissions, utilizing an electrohydraulic circuit and a creeper mode selection lever, where a sensor observes the lever position and a controller processes the data to position synchronizers in a neutral mode, allowing the transmission to shift into a creeper gear range, enabling ultra-low speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional transmission with standard gear ranges is used, then the transmission structure remains simple, but the work vehicle cannot achieve the desired ultra-low speed for tillage or planting operations
Solution Approach 1:
The transmission system is segmented into two independent control paths: a mechanical creeper mode selection lever for ultra-low speed ranges and an electrohydraulic circuit for standard gear ranges. This segmentation allows the addition of creeper functionality without redesigning the entire transmission system, resolving the contradiction between achieving ultra-low speed and maintaining structural simplicity.
Solution Approach 2:
A mechanical interlock mechanism serves as an intermediary between the creeper mode selection lever and the electrohydraulic circuit. When creeper mode is selected, the interlock prevents the electrohydraulic circuit from operating, ensuring that only one mode is active at a time. This intermediary component enables the integration of two different control systems without conflict.
2Ease of operation
If a mechanical creeper mode selection system with sensor and controller is added, then precise creeper gear range selection is achieved, but the system complexity increases
Solution Approach 1:
The system incorporates a sensor that automatically detects the position of the creeper mode selection lever and sends signals to the controller. The controller then automatically actuates the appropriate synchronizer based on the detected position, eliminating the need for complex manual coordination and reducing operational complexity despite the added electronic components.
Solution Approach 2:
The sensor provides real-time feedback on the lever position to the controller, which adjusts the synchronizer position accordingly. This feedback loop ensures accurate and reliable creeper mode selection while maintaining ease of operation, as the system self-regulates based on the operator's input without requiring complex control mechanisms.
3Reliability
If synchronizers are positioned in neutral mode during creeper operation, then gear shifting is prevented, but the transmission control complexity increases
Solution Approach 1:
When creeper mode is selected, the system preemptively positions the synchronizers in neutral mode to prevent any unintended gear shifting. This preliminary action ensures that the transmission remains in the selected creeper range without risk of accidental shifts, enhancing reliability while using a simple control mechanism that does not significantly increase complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system allows the work vehicle to operate at significantly reduced ground speeds, facilitating precise control during agricultural operations by providing distinct creeper gear ranges, thereby enhancing operational efficiency and maneuverability.
Implementation Method 1
outputting, with the processor, one or more control signals to the electrohydraulic circuit to direct a flow of hydraulic fluid to position the one or more synchronizers
Data Source
AI summary
A mechanical creeper mode selection system for a transmission of a work vehicle is provided, in which the transmission includes one or more range modes having one or more range mode shift mechanisms each driven by an electrohydraulic circuit. The system includes a creeper mode selection lever movable by an operator to select a creeper gear range. The system also includes a sensor that observes a position of the creeper mode selection lever and generates sensor signals based thereon. The system includes a controller that processes the sensor data to determine a movement of the creeper mode selection lever and outputs one or more control signals to the electrohydraulic circuit to position the one or more range mode shift mechanisms in a range neutral mode based on the movement of the creeper mode selection lever.