Work Vehicle Controller Automatic Dump Tilt Control
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Solution Overview
Problem
Operators of work vehicles, such as wheel loaders and bulldozers, unintentionally activate automatic drive control when making small incremental movements with the operating lever, leading to unintended operation of attachments.
Innovation Solution
A controller system that disables automatic drive control if the switching time between tilt and dump operations is less than a predetermined period, allowing operators to perform small incremental movements without triggering automatic functions, thereby improving operability and preventing unintentional attachment operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the operating lever is tilted by a predetermined amount or greater to the tilt side or dump side, then automatic drive control is activated for repeated positioning, but unintended automatic operation occurs when operators make small incremental movements to even out and mix the load
Solution Approach 1:
The control system dynamically adjusts its sensitivity based on the duration and pattern of lever operation. By monitoring whether the lever is held in a tilted position for a predetermined time period, the system distinguishes between intentional automatic drive commands and unintentional small incremental movements, enabling adaptive response to different operational contexts
Solution Approach 2:
The system implements feedback by continuously monitoring the operating lever position and duration, then using this information to determine whether to activate automatic drive control. The controller receives feedback about lever tilt duration and uses this to confirm or cancel automatic operation commands, preventing unintended activation while maintaining productive automatic positioning when intended
2Ease of operation
If the operating lever is operated by small increments to swing the attachment back and forth, then the load can be evenly distributed and mixed, but automatic drive control may be accidentally triggered
Solution Approach 1:
The control system dynamically responds to the speed and duration of lever operations. When operators make quick small incremental movements for load mixing, the lever does not remain tilted long enough to trigger automatic drive control. The system adapts its activation threshold based on the temporal characteristics of the input, allowing free manual operation for load distribution while preventing accidental automatic positioning
Data Source
AI summary
A work vehicle includes a vehicle body, a work implement including an attachment, an operating device and a controller. The operating device can be operated to a dump side and a tilt side to cause the attachment to dump and tilt. The controller executes an automatic drive control in which the attachment is caused to dump as far as a predetermined dumping position when the operating device is operated by a first dump operation amount or greater to the dump side, or to tilt as far as a predetermined tilt position when the operating device is operated by a first tilt operation amount or greater to the tilt side. The controller disables the automatic drive control when a switching time period required for the operating device to be switched between the tilt and dump sides is at least a predetermined disabling time period.