Operator Assistance System for Wheel Loaders
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Solution Overview
Problem
Operators of machines like wheel loaders face increased mental pressure and operational errors during load-dump cycles due to the need to manage a 'V' shaped pattern of movement, balance changes in the center of gravity, and avoid tipping, while simultaneously raising and aligning implements, leading to inefficiencies and productivity issues.
Innovation Solution
An operator assistance system equipped with a rotation sensor and controller that estimates the number of rotations of the machine's ground engaging member and alerts the operator when approaching or exceeding a predetermined threshold, providing visual and audio cues to help manage the movement and implement positioning effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operator manually manages the V-shaped movement pattern and implement positioning simultaneously, then the operator can control the machine, but the mental pressure increases and operational errors occur
Solution Approach 1:
The system uses rotation sensors to continuously monitor the actual rotation of ground engaging members and compares this data with planned rotation values. This feedback mechanism provides real-time information to the operator through the display unit, enabling the operator to understand the machine's position and status without excessive mental effort, thereby reducing operational errors while maintaining control
Solution Approach 2:
The controller acts as an intermediary between the operator's commands and the machine's actual movements. It processes rotation data from sensors, calculates actual versus planned positions, and presents this information through the display unit. This intermediary system handles the complex calculations and data processing, freeing the operator from excessive mental burden while ensuring accurate control
2Manufacturing precision
If the operator focuses on aligning the machine with the unloading location, then the alignment can be achieved, but wasteful travel occurs due to lack of attention to reversal extent
Solution Approach 1:
The system provides continuous feedback on the actual rotation of ground engaging members compared to planned rotation. The display unit shows this information to the operator, enabling simultaneous monitoring of both alignment progress and travel distance. This allows the operator to achieve precise alignment while avoiding wasteful travel by knowing exactly how far the machine has moved
Solution Approach 2:
The system replaces manual estimation and mental tracking of machine position with an automated electronic monitoring system. Rotation sensors and controllers automatically track the machine's position and provide this information through the display unit, eliminating the need for the operator to mentally calculate and estimate travel distance and alignment status
3Productivity
If the implement is raised to the higher position for unloading, then the unloading can be performed, but the center of gravity changes causing unbalance and tipping risk
Solution Approach 1:
The system monitors the rotation of ground engaging members during implement raising and provides feedback on the actual position achieved. This allows the operator to raise the implement to the necessary height for unloading while being aware of the machine's response and position changes, enabling cautious operation to maintain stability
Solution Approach 2:
The system allows the operator to plan the implement raising operation by showing planned rotation values before execution. The operator can prepare for the center of gravity changes and stability implications in advance, taking preliminary actions to ensure safe operation during and after implement positioning
4Productivity
If the operator performs multiple tasks simultaneously during the load-dump cycle, then the work cycle can be completed, but productivity decreases due to increased mental pressure and errors
Solution Approach 1:
The system provides integrated feedback on multiple parameters simultaneously through the display unit, including actual versus planned rotation of ground engaging members, implement position, and machine status. This consolidates multiple information streams into a single interface, allowing the operator to manage multiple tasks with reduced mental effort and fewer errors, thereby improving overall productivity
Solution Approach 2:
The controller performs multiple functions: monitoring rotation sensors, calculating actual versus planned positions, determining machine status, and controlling the display unit. This multi-functional system handles various aspects of machine operation through a single integrated controller, reducing the operator's burden by automating complex coordination tasks
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system reduces operator mental pressure, minimizes the risk of unbalancing or tipping, and enhances productivity by providing timely alerts and automatic assistive control during the load-dump cycle, thereby reducing wasteful travel and operational errors.
Implementation Method 1
The rotation sensor is configured to generate a signal indicative of a rotation of a ground engaging member of the machine
Data Source
AI summary
A system for assisting an operator to maneuver a machine on a worksite is provided. The system includes a rotation sensor associated with a transmission assembly of the machine. The rotation sensor is configured to generate a signal indicative of a rotation of a ground engaging member of the machine. The system includes a controller communicably coupled to the rotation sensor. The controller is configured to receive the signal indicative of the rotation of the ground engaging member of the machine. The controller is configured to determine if the machine is on a reverse traversal. The controller is configured to estimate a number of rotations of the ground engaging member based on the determination of the reverse traversal of the machine. The controller is configured to compare the estimated number of rotations with a predetermined threshold. The controller is further configured to alert the operator based on the comparison.