Work Vehicle Controller Calibration for Hydraulic Valve Current
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Solution Overview
Problem
Existing work vehicles face challenges in accurately calibrating data for predicting the operation speed of work implements due to the inability to specify the relation between command current output from a controller and the operation of an electromagnetic proportional control valve effectively.
Innovation Solution
A work vehicle configuration that includes a controller with a storage unit, a current value control unit to stepwise increase the current output to the electromagnetic proportional control valve by temporarily lowering it, and a calibration unit to calibrate data based on sensor detection results, allowing for accurate specification of the relation between command current and operation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current value is increased simply without lowering first, then the calibration process is simple, but the relation between command current and work implement operation cannot be specified accurately
Solution Approach 1:
The controller performs a preliminary action by temporarily lowering the command current value to a predetermined value before increasing it to the target value. This preliminary lowering action ensures that the electromagnetic proportional control valve returns to a neutral or initial state, eliminating any residual effects from previous current applications. By doing so, the system establishes a consistent baseline for each calibration measurement, enabling accurate specification of the relation between command current and work implement operation.
2Measurement precision
If the current value difference is maximized by lowering to predetermined value, then the calibration accuracy is improved, but the control process becomes more complex
Solution Approach 1:
The calibration process employs periodic action by repeatedly cycling the command current through a standardized sequence: lowering to a predetermined value, then increasing to a target value. This periodic cycling is performed multiple times for different target values to collect comprehensive calibration data. The regular repetition of this current adjustment pattern ensures consistent measurement conditions while systematically building the calibration curve, balancing accuracy requirements with efficient data collection.
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
This configuration enables accurate calibration of data for predicting operation speeds by maximizing the difference in current values, thereby improving the accuracy of specifying the relation between command current output and work implement operations.
Implementation Method 1
an electromagnetic proportional control valve generating a pilot pressure guided to the valve
Implementation Method 2
a valve adjusting a flow rate of a hydraulic oil operating the work implement
Data Source
AI summary
A work vehicle includes a work implement, a valve adjusting a flow rate of a hydraulic oil operating the work implement, an electromagnetic proportional control valve generating a pilot pressure guided to the valve, a controller outputting a current to the electromagnetic proportional control valve, and a sensor for detecting an operation of the work implement. The controller increases stepwise a current value of a current output to the electromagnetic proportional control valve by repeating processing for temporarily lowering a current value of the current output to the electromagnetic proportional control valve and thereafter outputting to the electromagnetic proportional control valve, a current having a current value greater than the current value before lowering. The controller calibrates data for predicting an operation speed of the work implement based on a result of detection by the sensor at the time when the current value is increased stepwise.