Variable Valve Sensor Calibration via Reference Positioning
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Solution Overview
Problem
The existing variable valve mechanism lacks means for automatic restoration of the control shaft to a specified position, making it difficult to accurately adjust the sensor mounting position for detecting the rotation position of the control shaft, especially when the sensor output exceeds the tolerable input range of the processing circuit.
Innovation Solution
The mechanical load is moved to a reference position using an actuator, and the sensor output is adjusted into a reference range by judging its position and output, allowing for accurate adjustment even without automatic restoration mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor mounting position is adjusted manually to ensure accurate detection, then the measurement precision is improved, but the device complexity and adjustment difficulty increase due to the lack of automatic restoration mechanism
Solution Approach 1:
The control shaft is forcibly moved to a predetermined reference position (minimum lift amount position) before sensor adjustment. This preliminary positioning action ensures that the sensor is adjusted under known controlled conditions, enabling accurate calibration without requiring complex automatic restoration mechanisms during the adjustment process itself.
2Measurement precision
If the sensor output is learned at the minimum lift amount position, then the measurement precision is improved, but the reliability decreases when the mechanical load position becomes uncertain due to lack of automatic restoration
Solution Approach 1:
The system forcibly moves the control shaft to a predetermined reference position before performing sensor adjustment and learning. This ensures that the sensor is calibrated under controlled conditions where the mechanical load position is known and certain, thereby ensuring reliable sensor output even when the mechanism lacks automatic restoration capability during normal operation.
3Device complexity
If no automatic restoration mechanism is provided, then the device complexity is reduced, but the measurement precision deteriorates due to uncertain mechanical load position
Solution Approach 1:
Instead of requiring continuous automatic restoration during operation, the system performs a preliminary action by forcibly moving the control shaft to a reference position before sensor adjustment. This allows the mechanism to remain simple without automatic restoration while still achieving accurate sensor calibration through controlled preliminary positioning.
Solution Approach 2:
The actuator itself is used to move the control shaft to the reference position for adjustment purposes, utilizing the existing actuator functionality rather than requiring separate automatic restoration mechanisms. This self-service approach maintains system simplicity while enabling accurate sensor adjustment.
Data Source
AI summary
The present application provides a sensor adjusting method and a sensor adjusting system for a variable valve mechanism. An actuator is controlled based on an adjustment request signal from an external device in such a manner that a mechanical load of a variable valve mechanism moves to a position where the movement is limited by a stopper. When it is judged that the mechanical load has moved to the position where the movement is limited by the stopper, the mounting position and the electrical characteristics of the sensor for detecting the mechanical load are adjusted so that the output of the sensor assumes a reference value.