Wheel Loader Speed Dial Control for Fine Travel Adjustment
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Solution Overview
Problem
Wheel loaders require a system to easily adjust vehicle speed based on different work types, necessitating a wide range of speed restrictions with precise settings, especially on mud ground, and the ability to set speed in small increments or decrements with simple operations.
Innovation Solution
A work machine control system comprising a base member, an operational input portion, an operational force providing portion, and a transmission portion that changes the speed of rotation in response to the operator's input, allowing for multiple operational forces and precise speed adjustments through a dial apparatus with distinct engagement positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a dial knob with sliding operational feeling is used for speed setting, then the device complexity is reduced, but the manufacturing precision and operational precision for small increment adjustments deteriorate
Solution Approach 1:
The dial knob is segmented with multiple engagement positions (first engagement position for coarse adjustment, second engagement position for fine adjustment) that divide the speed setting range into different precision levels. This segmentation allows the operator to achieve both wide-range adjustments and precise small increments using the same simple dial mechanism.
Solution Approach 2:
Different operational characteristics are provided at different positions of the dial knob. The first engagement position provides one type of operational feedback while the second engagement position provides different operational feedback, allowing each region of the dial to serve a specific precision requirement.
2Adaptability or versatility
If a wide range of speed restriction is provided for different work types, then the adaptability is improved, but the ease of operation for precise speed setting deteriorates
Solution Approach 1:
The dial knob dynamically changes its operational characteristics based on its position. As the operator rotates the dial, the operational feeling changes at different engagement positions, providing appropriate resistance and feedback for both wide-range adjustments and precise positioning without requiring multiple separate controls.
Solution Approach 2:
The operational parameters of the dial knob (such as rotational resistance, engagement force, or feedback characteristics) are changed at different positions during rotation. This allows the same dial mechanism to provide both broad speed range selection and fine-tuned precision adjustment by varying its operational properties throughout the rotation cycle.
Data Source
AI summary
A work machine control system includes an operational input portion that accepts an input operation to change a position of acceptance, maintains the position of acceptance when there is no input operation accepted, and provides an operation command in accordance with change in position of acceptance, an operational force providing portion that provides a plurality of operational forces in correspondence with an amount of change of the position of acceptance, a transmission portion that changes a speed of rotation provided from a drive source to transmit resultant rotation to a drive wheel, and a controller that controls the transmission portion based on a travel speed of the drive wheel in accordance with the operation command.