Magnetic Sensor Dynamic Calibration Mode Switching
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Solution Overview
Problem
Magnetic field sensors in vehicles become sensitive to non-engine-related movements, leading to false engine management warnings due to their increased power-up before engine start, causing unnecessary distress and operational issues.
Innovation Solution
A magnetic sensor system that can switch between 'slow' and 'fast' calibration modes based on detected motion types, using directional information to select appropriate calibration modes and reduce false triggering during loading/unloading activities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the magnetic field sensor is powered up before engine start (upon door opening), then the sensor achieves operational state early, but the sensor becomes sensitive to non-engine movements causing false warnings
Solution Approach 1:
The patent implements dynamic calibration mode selection that adapts to current motion conditions. The sensor switches between fast calibration mode (when stationary or minimal motion detected) and slow calibration mode (when vehicle motion or loading detected), allowing early operational readiness while preventing false warnings through context-appropriate calibration behavior
Solution Approach 2:
The system changes operational parameters by selecting different calibration modes based on detected motion types. The calibration mode parameter is adjusted dynamically - using fast calibration for stationary conditions and slow calibration for moving conditions - thereby optimizing both response time and reliability according to current operational context
2Measurement precision
If sophisticated algorithms are implemented in the magnetic field sensor, then the accuracy of rotational position determination is improved, but the device complexity increases
Solution Approach 1:
The patent employs dynamic algorithm selection through multiple calibration modes. Instead of using a single complex algorithm always, the system dynamically selects between fast calibration algorithm (simpler, faster) and slow calibration algorithm (more sophisticated, more accurate) based on motion detection, thereby achieving high accuracy when needed while reducing complexity during routine operations
Solution Approach 2:
The calibration process is segmented into different modes (fast and slow calibration) that can be selected based on operational conditions. This segmentation allows the system to use appropriate levels of algorithmic complexity for different scenarios, avoiding unnecessary computational overhead while maintaining measurement precision when required
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
Enhances the accuracy and reliability of rotational position determination, preventing false engine warnings by quickly adapting calibration modes to vehicle conditions, thus improving sensor performance and reducing unnecessary alerts.
Implementation Method 1
magnetic field sensor used to determine a current state of the crankshaft
Data Source
AI summary
At least one embodiment relates to magnetic field sensors being operable at different calibration modes, wherein the magnetic sensor is capable of switching between the different calibration modes during normal operation of the sensor. The switching may be possible in response to different motion types detected within the sensor. Such sensors may be used in vehicles such as cars, the sensors for example being part of the engine control system or the ABS. Another embodiment relates to a method of changing calibration modes during operation of sensors.