Implement Position Control Automatic Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional implement position control systems face challenges in precise calibration, especially in field conditions with uneven terrain, as they require a flat surface for calibration, which is impractical for earthmoving machines like bulldozers and graders.
Innovation Solution
The system calculates a first elevation value of the implement and a second elevation value of the ground-engaging device in a gravity coordinate frame, determining their difference to calibrate the implement actuation sensors, allowing for accurate positioning and control even on uneven surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional calibration methods using GPS and encoders are used, then positioning can be achieved, but precise calibration is challenging because the system requires a flat surface for calibration which is difficult to obtain in field conditions
Solution Approach 1:
The patent replaces the mechanical/physical calibration method (requiring flat surface for GPS antenna alignment) with an automated sensor-based measurement system. The controller automatically measures the position of the implement cutting edge using sensors and compares it with the position calculated from actuator sensor outputs, eliminating the need for manual flat-surface alignment procedures.
Solution Approach 2:
The system performs self-calibration by automatically measuring the implement cutting edge position using onboard sensors and comparing it with calculated positions from actuator sensors. The controller automatically adjusts the encoder outputs to achieve calibration without requiring external intervention or manual positioning procedures, enabling the system to calibrate itself in field conditions.
2Manufacturing precision
If manual calibration procedures are used, then calibration can be performed, but the process is time-consuming and requires manual intervention to position the tool and adjust encoder outputs
Solution Approach 1:
The system performs self-calibration by automatically measuring the implement cutting edge position using onboard sensors and comparing it with calculated positions from actuator sensors. The controller automatically adjusts the encoder outputs to achieve calibration without requiring external intervention or manual positioning procedures, eliminating time-consuming manual steps.
Solution Approach 2:
The controller is pre-programmed with the calibration procedure that automatically measures the implement cutting edge position, compares it with calculated positions, and adjusts encoder outputs. This preliminary programming eliminates the need for manual calibration steps during field operations, reducing calibration time while maintaining accuracy.
Data Source
AI summary
A method, system, and non-transitory computer-readable storage medium for calibrating an implement actuation sensor of a machine are disclosed. The method may include calculating a first elevation value of an implement of the machine in a gravity reference frame of the machine. The method may further include calculating a second elevation value of a ground-engaging device of the machine in the gravity reference frame of the machine. The method may further include determining a difference between the first elevation value and the second elevation value. The method may further include calibrating the implement actuation sensor based on the determined difference.