Engine Signal Generator with Rounded Reluctor for Crest Balance
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Solution Overview
Problem
Existing engine signal generating devices face issues with pulse signal crest values imbalance, leading to potential engine control unit malfunctions due to noise interference, and size and strength challenges in reluctors, which affect cylinder discrimination accuracy.
Innovation Solution
The device incorporates a rotor with a first step reluctor having a rounded tip and/or a stator iron core with rounded magnetic poles to control magnetic flux changes, ensuring equal crest values for pulse signals, preventing signal misinterpretation by the engine control unit without increasing reluctor size or reducing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the tip of the first step reluctor is made sharp to increase magnetic flux change, then the pulse signal crest value increases, but the signal may exceed the permissible range and cause engine control unit malfunction
Solution Approach 1:
The tip of the first step reluctor is formed with a rounded shape (spheroidality) instead of a sharp edge. This curvature limits the maximum magnetic flux change when the reluctor passes the magnetic pole, thereby controlling the pulse signal crest value to remain within the permissible range and prevent engine control unit malfunction while still providing detectable signals.
2Measurement precision
If the width of the first step reluctor is increased to improve cylinder discrimination, then the cylinder identification accuracy improves, but the rotor size increases and balancing becomes difficult
Solution Approach 1:
The invention uses asymmetric step structures where the first step reluctor has a smaller width than the second step reluctor. This asymmetric design enables cylinder discrimination through the sequential detection pattern (first step then second step) without requiring uniform increases in all reluctor dimensions, thus avoiding rotor balancing issues while maintaining discrimination accuracy.
3Length of moving object
If the width of the first step reluctor is decreased to reduce rotor size, then the rotor dimensions are reduced, but the pulse signal crest value decreases and may be misinterpreted as noise
Solution Approach 1:
By rounding the tip of the first step reluctor, the invention optimizes the magnetic flux transition characteristics. This curvature ensures that even with a reduced reluctor width, the pulse signal maintains sufficient crest value to be reliably detected and distinguished from noise, while still keeping the rotor compact.
4Reliability
If a deformed part is added to control magnetic flux changes, then the pulse signal crest values are balanced, but the manufacturing complexity increases
Solution Approach 1:
The deformed part is implemented as a simple rounded tip on the first step reluctor, which can be manufactured using conventional forming processes. This curvature modification is integrated into the basic reluctor geometry rather than being an separate complex deformation, making it compatible with standard manufacturing methods while achieving the desired magnetic flux control and signal balancing.
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
This configuration ensures accurate cylinder discrimination and prevents engine control unit malfunctions by maintaining balanced crest values for pulse signals, enhancing engine control reliability.
Implementation Method 1
The stator causes the signal coil to induce a pulse waveform signal by causing a change in the amount of magnetic flux flowing through the stator iron core as the rotor reluctor passes through the position of the magnetic pole at the tip of the stator iron core
Implementation Method 2
providing a deformed part at the tip of the first step reluctor of the rotor and (or) in the magnetic pole of the stator iron core so as to be able to control changes that occur in the magnetic flux
Data Source
AI summary
A signal generating device for an engine may include a rotor and a stator. The rotor may include a reluctor including a first step reluctor and a second step reluctor. The stator may include a stator iron core, a signal coil, and a permanent magnet. The stator may be configured to induce a first signal and a second signal having the same polarity in the signal coil as a result of changes that occur in the magnetic flux when the tip of each of the step reluctors starts to face the magnetic pole of the stator iron core. A deformed part of the first step reluctor and/or the stator iron core may be configured to control the changes in the magnetic flux such that a crest value of the first signal is limitable to a value that is equal to or less than a crest value of the second signal.