Pilot Oil Pressure Sensor Calibration for Excavator Control
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Solution Overview
Problem
The accuracy of excavation operations in construction machines, such as excavators, is compromised when pressure sensors detecting pilot oil pressure provide different detection values, leading to decreased excavation precision.
Innovation Solution
A construction machine control system that includes pressure sensors and a control valve system to adjust and calibrate the pilot oil pressure, ensuring that the detection values from these sensors are identical, thereby maintaining excavation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pressure sensors are provided to detect pilot oil pressure, then measurement reliability is improved, but measurement precision deteriorates when detection values differ
Solution Approach 1:
The system uses feedback from multiple pressure sensors to continuously monitor and compare detection values. When discrepancies are detected, the system adjusts the pilot oil pressure or sensor calibration to ensure consistent readings, thereby maintaining measurement precision while utilizing multiple sensors for reliability.
Solution Approach 2:
The system changes the parameter of pilot oil pressure dynamically to calibrate the pressure sensors. By adjusting the pressure to specific calibration points and comparing sensor readings at these points, the system ensures that all sensors provide identical detection values under the same conditions, resolving the precision issue while maintaining reliability.
2Manufacturing precision
If pressure sensors are calibrated to provide identical detection values, then excavation accuracy is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary calibration of pressure sensors during the initialization phase or maintenance periods. By pre-calibrating sensors to provide identical detection values under known conditions, the system ensures excavation accuracy without requiring continuous complex adjustments during operation.
Solution Approach 2:
The control system automatically performs calibration routines using its own resources. The system uses its internal control capabilities to adjust pilot oil pressure and compare sensor readings, automatically correcting discrepancies without external intervention, thereby maintaining accuracy while minimizing the need for additional complex calibration equipment.
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 effectively suppresses the decrease in operation accuracy by ensuring consistent pressure readings across the sensors, enhancing the precision of excavation operations.
Implementation Method 1
a first pressure sensor that is disposed in the pilot oil passage between the operating device and the control valve and detects the pressure of the pilot oil
Implementation Method 2
a control valve that is disposed in the pilot oil passage and capable of adjusting the pressure of the pilot oil
Implementation Method 3
a hydraulic cylinder that drives the work machine
Data Source
AI summary
A control system includes: a first pressure sensor disposed in a pilot oil passage between an operating device and a control valve and detecting pressure of pilot oil; a second pressure sensor disposed in the pilot oil passage between the control valve and a direction control valve and detecting the pressure of the pilot oil; a control valve controller controlling the control valve; a data acquisition unit acquiring data on a detection value of the first pressure sensor and a detection value of the second pressure sensor in a state where the pilot oil passage is opened by the control valve; and a correction unit correcting the detection value of the first pressure sensor or the second pressure sensor based on the data acquired by the data acquisition unit so that the detection value of the first pressure sensor is identical to the detection value of the second pressure sensor.