Work Vehicle Shift Limit Control Using Long-Press Gear Jump
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Solution Overview
Problem
In earthmoving machine vehicles, raising the shift upper limit position of a multiple-speed transmission by multiple positions requires multiple presses of a switch, which is inefficient.
Innovation Solution
A work vehicle equipped with a controller that allows the shift upper limit position to be raised by one position with a single operation and further raised to a higher position (at least two positions higher) with a long-press operation, enabling direct transition to a higher gear position based on vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second switch is pressed once to raise the shift upper limit position by one position, then the gear position can be adjusted incrementally, but multiple presses are required to raise the position by multiple positions, increasing operation time
Solution Approach 1:
The system dynamically changes the shift upper limit position based on the duration of the button press. A short press raises the position by one gear, while a long press (exceeding a predetermined time threshold) raises the position by multiple gears directly to the target position, allowing the operator to quickly adjust to the desired gear position without multiple incremental presses
Solution Approach 2:
The control unit changes the parameter of shift upper limit position by different amounts based on the press duration parameter. When the press time exceeds the threshold, the system jumps to a higher gear position (at least two positions higher) instead of incrementally increasing by one position, thus reducing the number of operations required
2Productivity
If multiple switches are provided to enable direct raising of the shift upper limit position by multiple positions, then operation efficiency improves, but device complexity increases
Solution Approach 1:
The single second switch performs multiple functions: it can raise the shift upper limit position by one gear with a short press, or by multiple gears with a long press. This multi-functionality eliminates the need for multiple separate switches while maintaining high operation efficiency
Solution Approach 2:
The control unit acts as an intermediary that interprets the duration of the button press and determines the appropriate gear position change. This mediator translates a single physical action (button press) into different operational outcomes based on temporal parameters, avoiding the need for multiple physical switches
Data Source
AI summary
A work vehicle includes an operation apparatus, a transmission having a plurality of gear positions, and a controller configured to control shift of a gear position of the transmission to a gear position equal to or lower than a shift upper limit position based on a vehicle speed of the work vehicle. The controller makes setting to raise the shift upper limit position by one position based on a first operation having been performed onto the operation apparatus. The controller changes the shift upper limit position from a first shift upper limit position immediately before a second operation different from the first operation to a second shift upper limit position based on the second operation having been performed onto the operation apparatus. The second shift upper limit position is higher than the first shift upper limit position by at least two positions.