Wheel Loader Implement Control for Variable-Speed Auto Positioning
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Solution Overview
Problem
Existing automatic drive control systems for work vehicles, such as wheel loaders and bulldozers, cannot drive the work implement at a desired speed, always operating at maximum speed.
Innovation Solution
A control method and system that allows the work implement to be driven at a desired speed by using a controller to adjust the driving speed based on the tilt of the operating lever, incorporating sensors and hydraulic valves to manage the boom and bucket operations, enabling precise control of the work implement's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automatic drive control is executed by returning the operating lever to the neutral position after maximum movement, then the work implement can be driven to a predetermined position, but the work implement cannot be driven at a desired driving speed because it is constantly driven at maximum driving speed
Solution Approach 1:
The patent applies dynamics by making the driving speed variable rather than fixed. The control device dynamically adjusts the driving speed of the work implement based on the operating lever position during automatic drive control, allowing the speed to change from maximum to desired speeds, thus resolving the contradiction between automated operation and speed control flexibility
Solution Approach 2:
The patent changes the speed parameter dynamically during automatic drive control. By adjusting the driving speed parameter based on operating lever position, the system transitions from constant maximum speed to variable desired speed, enabling both automated operation and flexible speed control
2Productivity
If the work implement is driven at maximum driving speed during automatic drive control, then the operation can be completed quickly, but the operator cannot drive the work implement at a desired driving speed
Solution Approach 1:
The system dynamically adjusts driving speed based on operating lever position, allowing transitions between maximum speed for quick operations and reduced speeds for precise control, thus achieving both high productivity and adaptability
Solution Approach 2:
The driving speed parameter is changed dynamically during operation based on lever position, enabling the system to adapt between maximum speed for efficiency and desired speed for control, resolving the contradiction between productivity and versatility
Data Source
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AI summary
A wheel loader (1) is provided with a work implement (5) attached to a vehicle body, an operating lever (CL) for operating the work implement (5), a controller (25) for driving the work implement at a driving speed corresponding to a tilting amount of the operating lever (CL) relative to a neutral position, and an automatic drive control button (29) for receiving an execution instruction of an automatic drive control for automatically driving the work implement (5) as far as a predetermined position. The controller (25) executes the automatic drive control at a driving speed set in response to the amount of tilting of the operating lever (CL) when the execution instruction is received from the automatic drive control button (29) while the operating lever (CL) is tilted.