Rotation Angle Detection Device with Correction Mechanism
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Solution Overview
Problem
Existing rotation angle detection devices for vehicles face challenges in accurately detecting the rotation angle when mounting errors occur, leading to increased costs due to the need for re-mounting operations.
Innovation Solution
A rotation angle detection device with a correction mechanism that adjusts the detection angle to maintain linear characteristics across predetermined ranges, allowing for accurate detection even with mis-mounting, by adding or subtracting values based on the minimum and maximum values of the detection angle, and includes a notification system for mis-mounting occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the numbers of teeth of the two detection gears are made different to achieve univocal detection angle, then the detection angle can be uniquely determined within a unit range, but the device becomes sensitive to mounting errors and requires re-mounting operations when the rotation angle range deviates from the unit range
Solution Approach 1:
The patent changes the parameter of detection angle range by making the unit range larger than the actual rotation angle range. This is achieved by selecting gear tooth counts such that the unit range (detection angle range for univocal detection) exceeds the predetermined rotation angle range. This parameter change allows the system to tolerate mounting errors without requiring re-mounting operations, while still maintaining univocal detection within the actual operating range.
2Adaptability or versatility
If the unit range of the rotation angle detection device is made larger to accommodate mounting errors, then mounting error tolerance improves, but the detection angle linear characteristics may be compromised
Solution Approach 1:
The patent segments the detection angle range into multiple unit ranges, each maintaining linear characteristics. By dividing the overall detection range into sequential unit ranges with consistent linear relationships, the system preserves detection angle linearity across the entire predetermined range while accommodating mounting errors. Each unit range maintains the same linear characteristics, ensuring continuous accuracy without compromise.
3Adaptability or versatility
If the gear tooth counts are altered to accommodate different rotation angle ranges, then adaptability to mounting errors improves, but the device weight and dimensions increase
Solution Approach 1:
The patent designs the detection gear system with universal applicability by selecting gear tooth counts that create a unit range larger than any expected rotation angle range. This multi-functional design allows the same detection device to accommodate various rotation angle ranges and mounting errors without requiring different gear configurations. The system achieves adaptability through software correction mechanisms rather than hardware changes, avoiding weight increases.
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
Enables accurate detection of the rotation angle over the entire range without the need for re-mounting, reducing production costs and avoiding weight and dimension increases associated with altering gear tooth counts.
Implementation Method 1
two magnetic resistance elements that face the magnets and that each magnetically detect the rotation angle of a corresponding one of the two detection gears
Data Source
AI summary
A rotation angle detection device includes: a detection portion that detects detection angle that univocally corresponds to rotation angle of a rotating body which is within a predetermined range, wherein the detection angle linearly increases from a minimum value to a maximum value as the rotation angle increases within a unit range, and the detection angle changes from the maximum value to the minimum value or from the minimum value to the maximum value at a boundary between unit ranges that are adjacent to each other; and a correction portion that corrects the detection angle so that the detection angle detected in the predetermined range has linear characteristics, if the boundary between the unit ranges is contained in the predetermined range.