Traveling Work Vehicle Gear-Shifting Control Unit
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Solution Overview
Problem
Traveling work vehicles face challenges in smoothly transitioning between gear stages due to the difference in gear-shifting operations between main and sub gear-shifting apparatuses, leading to potential shocks during load changes and complexity in gear selection for drivers.
Innovation Solution
A gear-shifting control unit that manages gear stage switching between main and sub gear-shifting apparatuses, allowing for power transmission cutoff during sub gear-shifting operations while maintaining continuous power transmission during main gear-shifting, along with a multifunction lever for simplified operation and display screens for easy gear stage selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate operation levers are used for main and sub gear-shifting apparatuses, then gear-shifting control is precise, but operation complexity increases
Solution Approach 1:
The patent combines the main gear-shifting operation lever and sub gear-shifting operation lever into a single integrated operation lever. The operation lever can be shifted in multiple directions (front-rear and left-right) to control both gear-shifting apparatuses simultaneously, reducing the number of separate controls while maintaining precise gear selection capability.
Solution Approach 2:
The single operation lever serves multiple functions by enabling control over both the main gear-shifting apparatus and sub gear-shifting apparatus. Different shifting directions of the same lever correspond to different gear-shifting operations, making the lever a multi-functional control device that simplifies the interface while preserving control precision.
2Measurement precision
If sub gear-shifting apparatus is used for fine speed adjustment, then speed control precision is improved, but power transmission is interrupted during shifting
Solution Approach 1:
The gear-shifting system is divided into two independent but coordinated gear-shifting apparatuses: the main gear-shifting apparatus that handles primary gear changes with continuous power transmission, and the sub gear-shifting apparatus that provides fine speed adjustments. This segmentation allows each apparatus to specialize in its function while working together to achieve both precision and continuity.
Solution Approach 2:
The control unit acts as an intermediary that coordinates the operation of both gear-shifting apparatuses. It manages the timing and sequencing of shifts between the main and sub apparatuses, ensuring smooth transitions that minimize power transmission interruptions while achieving precise speed control.
3Adaptability or versatility
If multiple gear stages are combined from main and sub gear-shifting apparatuses, then gear ratio range is expanded, but gear selection difficulty increases
Solution Approach 1:
The system dynamically manages the combination of gear stages from both apparatuses based on operational needs. The control unit automatically coordinates the selection and combination of gear stages, transforming the complex static problem of selecting from many gear ratios into a dynamic process where the system adapts and presents simplified selection options to the operator.
Data Source
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AI summary
A traveling work vehicle includes a gear-shifting control unit (6) that outputs a gear-shifting control command to a main gear-shifting apparatus (30) for shifting gears without cutting off power transmission, a sub gear-shifting apparatus (31) for shifting gears by cutting off power transmission, and a first operation unit (MU) and a second operation unit (SU) that provide gear-shifting, upshifting or downshifting, operation commands to the gear-shifting control unit. The gear-shifting control unit (6) has a first travel control section (61) that generates a gear-shifting control command for shifting gears in the main gear-shifting apparatus (30) in response to the gear-shifting operation command from the first operation unit (MU) in a work traveling mode, and a second travel control section (62) that generates a gear-shifting control command for shifting gears in the sub gear-shifting apparatus (31) in response to the gear-shifting operation command from the second operation unit (SU) in the work traveling mode.