Valve Angle Sensor Calibration via Actual Position Measurement
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Solution Overview
Problem
Conventional methods for setting the output characteristic of a valve angle sensor result in variations across different products due to dimensional errors, leading to inconsistent sensor output characteristics.
Innovation Solution
A method that involves storing the actual measurement value of the valve angle at the mechanical full open position and setting output values at both the mechanical full close and actual full open positions to establish an ideal angle-to-output value relation, ensuring consistency across products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the output value at the mechanical full open position is set uniformly to Vo, then the setting process is simple, but the output characteristic varies for each product due to dimensional errors
Solution Approach 1:
The patent changes the parameter being set from a fixed uniform output value Vo to a variable output value Vo' that is calculated based on the actual measured angle θa. By adjusting the output value parameter according to the actual dimensional variations, the system maintains consistency across products while accommodating manufacturing tolerances.
Solution Approach 2:
The patent implements a feedback mechanism where the actual angle θa is measured and used to determine the appropriate output value Vo'. This feedback loop ensures that each product's sensor output is adjusted according to its specific dimensional characteristics, eliminating variation caused by manufacturing tolerances.
2Manufacturing precision
If the actual angle variation is compensated by adjusting the output value, then the output characteristic consistency is improved, but the setting process becomes more complex
Solution Approach 1:
The patent enables the sensor to self-adjust its output characteristic through an automated setting process. The actual angle θa is measured and automatically used to calculate the corrected output value Vo', eliminating the need for manual adjustment or complex external calibration equipment.
Solution Approach 2:
The patent modifies the output value parameter from a fixed uniform value to a calculated value Vo' that incorporates compensation for actual dimensional variations. This parameter change approach provides a systematic and relatively simple method to achieve consistency across products.
Data Source
AI summary
A valve is configured to control an opening in a passage. A valve angle sensor is configured to send an electric signal according to a rotation angle of the valve. In a storing process, an actual measurement value of a valve angle at a mechanical full open position is stored as an actual full open valve angle. In a first setting process, a first output value at a mechanical full close position is set. In a second setting process, a second output value at the stored actual full open valve angle is set. The output characteristic is set as an angle to output value relation according to the first output value and the second output value.