Work Implement Position Detection via Magnetic Field Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling work machines with tilting blades face challenges in accurately detecting the position of the work implement with respect to the vehicle body, especially when the yaw angle changes due to tilting, leading to inaccuracies in position calculation.
Innovation Solution
A system and method that utilize a work machine with a first and second frame actuated by respective actuators, equipped with sensors to detect roll and pitch angles, and a controller that calculates the yaw angle by comparing actual and assumed frame lengths, allowing precise position determination of the work implement even when the yaw angle changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the work implement tilts to perform work, then the work capability is improved, but the position detection accuracy deteriorates due to yaw angle changes
Solution Approach 1:
The patent replaces the conventional mechanical assumption-based position calculation with a magnetic field-based detection system. A magnet is attached to the work implement frame, and a magnetic sensor on the vehicle body detects the magnet's position. This magnetic field-based measurement system substitutes the mechanical calculation method, enabling accurate position detection even when the work implement tilts and the yaw angle changes.
2Device complexity
If acceleration sensors are used to calculate yaw angle by integrating angular velocities, then the detection method is simplified, but the accuracy deteriorates over time due to error accumulation
Solution Approach 1:
The patent replaces the acceleration sensor-based integration method with a direct magnetic field measurement approach. Instead of calculating yaw angle through time-based integration of angular velocities (which accumulates errors), the system uses a magnetic sensor to directly detect the magnet's position on the work implement frame, providing accurate orientation information without error accumulation.
Solution Approach 2:
The patent introduces a magnet as an intermediary element attached to the work implement frame. This magnet serves as a reference marker that the magnetic sensor on the vehicle body can detect, enabling indirect but accurate measurement of the work implement's position and orientation without requiring complex sensor integration or calculation.
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
Enables accurate detection of the work implement's position on the work machine, even during tilting, by calculating the yaw angle from the difference between actual and assumed frame lengths, thereby improving positional accuracy.
Implementation Method 1
a magnetic sensor that detects a magnet attached to the work implement frame
Data Source
AI summary
A system includes a work implement sensor attached to a work implement to detect work implement roll and pitch angles, and a controller. The controller acquires an actual frame length, a position of the first body connecting portion, and the roll and pitch angles. The controller calculates an assumed position of the first frame connecting portion when the yaw angle is assumed to be a predetermined angle based on the roll and pitch angles in the first posture, an assumed frame length indicating a distance between the assumed position of the first frame connecting portion and the first body connecting portion, the yaw angle of the work implement in the first posture based on a difference between the actual and assumed frame lengths, and a position of the predetermined portion of the work implement based on the roll, pitch and yaw angles of the work implement in the first posture.