Accelerator Pedal Abnormality Detection via Dual Hall Sensor Voltage Segmentation
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Solution Overview
Problem
Existing accelerator apparatuses fail to accurately determine abnormal rotational angles of the pedal due to forced deformation, as they rely on voltage differences within predetermined normal ranges, which can be misleading in abnormal states.
Innovation Solution
An accelerator apparatus with a support member, shaft, manipulation member, urging device, magnetic field generating device, and abnormality determining device, where the relationship between voltages from multiple magnetic field sensing devices determines abnormality based on threshold values, distinguishing between normal and abnormal rotational angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the accelerator apparatus uses voltage difference within predetermined normal range to determine normal operation, then the operation determination is simple, but it cannot detect abnormal states where pedal is forced deformed
Solution Approach 1:
The detection range is segmented into three distinct zones: normal range (first threshold to second threshold), warning range (beyond second threshold), and abnormal range (beyond first threshold). This segmentation allows the system to differentiate between normal operation, potential issues, and definite abnormalities, resolving the contradiction by maintaining simple threshold comparison while enabling reliable abnormal state detection through multi-zone classification
Solution Approach 2:
The system changes the parameter evaluation approach by using multiple threshold values (first threshold and second threshold) instead of a single normal range. This parameter change enables the system to detect abnormal states where the voltage difference exceeds the second threshold or falls below the first threshold, while maintaining simple operational determination through straightforward threshold comparison logic
2Measurement precision
If the accelerator apparatus determines abnormality based on voltage difference within normal range, then false abnormalities are reduced, but actual deformations are missed
Solution Approach 1:
The measurement range is segmented into normal measurement zone (between first and second thresholds) and abnormal measurement zone (beyond thresholds). This segmentation maintains high measurement precision for normal operations while enabling reliable deformation detection when voltage differences exceed the segmented boundaries, resolving the contradiction between measurement accuracy and deformation detection
Solution Approach 2:
The system dynamically adjusts the interpretation of voltage differences based on their magnitude relative to thresholds. For small voltage differences within the normal range, the system maintains high measurement precision for rotational angle. For large voltage differences beyond thresholds, the system transitions to deformation detection mode, dynamically adapting the detection focus to resolve the contradiction
3Reliability
If the accelerator apparatus uses multiple threshold values for abnormality determination, then detection accuracy improves, but the determination process becomes more complex
Solution Approach 1:
The determination process is segmented into simple threshold comparison steps rather than complex continuous analysis. The system divides the voltage difference range into discrete zones defined by first and second thresholds, allowing the determination process to remain simple through sequential threshold checking while achieving high detection accuracy through the segmented multi-zone evaluation
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
Effectively identifies abnormal rotational angles by computing voltage differences that exceed or fall below specific threshold values, enhancing the accuracy of pedal position detection and preventing false normal readings due to deformation.
Implementation Method 1
In the rotational angle sensor, each of magnetic flied sensing devices, which are rotatable relative to a magnetic field generating device installed to a shaft, converts a change in a magnetic flux density, into a voltage
Data Source
AI summary
When a rotational angle of a pedal is in a range from an angle of zero degrees to a predetermined rotational angle, which is larger than a full-opening-time rotational angle, a first Hall IC outputs a first voltage, which is twice larger than a second voltage outputted from a second Hall IC. When the rotational angle of the pedal is larger than the predetermined angle, the first Hall IC outputs a predetermined constant voltage. When an output difference, which is computed based on the first voltage and the second voltage, is equal to or smaller than a second threshold value, an abnormality of the sensed rotational angle of the pedal is determined.